As we all know, with the growth of world population, the contradiction of construction land is increasingly prominent. It is inevitable that modern buildings will gradually develop into high-rise buildings. Prefabricated wallboards with light weight, fast forming and convenient for mechanized and rapid installation have become the focus of common concern.

On September 30, 2016, the general office of the State Council issued the guiding opinions on vigorously developing prefabricated buildings, which immediately received positive response and promotion from all over the country. At present, more than 30 provinces and cities have issued special documents to promote the development of prefabricated buildings, and formulated a series of supporting measures and requirements.

There are many different types and types of prefabricated buildings and wall materials in the world, but there are still some unsatisfactory places. For example, the wallboard of cement and slag base material has heavy material, poor insulation, long molding time, high energy consumption and heavy pollution in cement production; Polymer wallboard is easy to burn, aging, volatilization and smell, which restricts its use in prefabricated buildings; All kinds of metal wallboards and wooden wallboards are also prone to corrosion, decay, poor fire resistance and high energy consumption.

Only high-strength gypsum wallboard is light in weight, fast in forming, white, neutral, odorless, energy-saving, environmental protection, good in thermal insulation performance, wide in use, and convenient for mechanized and rapid installation. It is a world recognized green building material with great development prospects and will gradually become the leading material for future walls.

Wall foundation materials

Gypsum is the basic material for prefabricated buildings and wallboard production, but at present, more than 95% of gypsum powder materials produced in China are β Type a building gypsum powder, with poor product performance and limited application fields, is mainly used in the production of gypsum board on the market or as an auxiliary building material, which can not be compared with cement and will not have great development in the future.

Prefabricated buildings mainly use various types of high-strength gypsum, including: α The demand of society will be more and more large for type II semi water high-strength gypsum, type II anhydrous gypsum and composite high-strength functional materials.

one α Type a semi water high strength gypsum

High strength gypsum is a revolutionary new material with comprehensive performance better than cement. Its compressive performance is higher than that of cement, and the flexural strength of gypsum with the same grade is more than twice that of cement. In addition, gypsum is white in color, light in weight, high in material yield, low in energy consumption, good in thermal insulation performance, and especially convenient to use. It is an environmentally friendly, healthy and green new material widely used in industrial developed countries.

In the past, although there were high-strength gypsum production in China, they were all single semi water α Because of its backward production technology, high cost, long cycle, small production capacity and low output, it can not meet the needs of the application of prefabricated wall panels.

In recent years, China's α The production technology of H-type semi-aqueous high-strength gypsum has made great progress, and the dry method has been introduced successively α The production capacity of single line can reach 100-500kt / A; Liquid phase method α The production capacity of single line can also reach 50-300kt / A, which is unprecedented at home and abroad. This creates a good guarantee condition for the production and wide application of high-strength gypsum wallboard, and also lays a foundation for the wide application of high-strength gypsum in the wall field.

2. Type II anhydrous gypsum

Type II anhydrous gypsum includes both natural gypsum and type II anhydrous gypsum calcined and processed by people. It can be converted into high-strength gypsum. This is hardly known in China, and there are few valuable research results.

With special processing technology and formula, type II anhydrous gypsum can be transformed into a new material with superior performance. It has the characteristics of long setting time, high softening coefficient, good operability, good water resistance, high compression and bending strength, and its performance in many fields is far better than that of semi water α M-type high-strength gypsum is a kind of new material with great potential.

Type II anhydrous gypsum is especially suitable for processing and manufacturing masonry mortar, plastering mortar, self leveling floor mortar and other premixed dry mixed mortar materials. The softening coefficient can generally reach more than 0.8, and the performance of cement can be approached by applying necessary technical improvement.

With the rapid transformation technology, type II anhydrous gypsum can also be used to make various high-strength gypsum wallboards, decorative boards, functional boards, substitute boards, etc.

3. Composite functional materials

Type II anhydrous gypsum and α Type a semi water high strength gypsum, even β Type a hemihydrate gypsum is mixed in different proportions, and then mixed with mineral materials, functional materials and chemical materials in different proportions to make various composite high-strength functional materials.

Composite high-strength functional materials can be widely used in the production of various wallboards, and can also be used as coating and finishing materials for various walls, floors and ceilings.

Embedded wall

The built-in wall is a wall that is built by using the built-in high-strength gypsum wallboard and masonry gypsum, and is dried and fixed after splicing, inlaying, bonding, plastering (or pasting) and other operations.

1. Type and purpose of wallboard

The embedded high-strength gypsum wallboard is a large-scale high-strength gypsum board which is made of 400 # or more high-strength gypsum powder as the main raw material, mixed with a certain amount of harmless industrial waste residue, or agricultural waste such as rice husk, sawdust, bamboo scraps and cotton stalks, and formed by scientific formula and mechanization. The width of the product is 1200mm, the thickness is freely set between 80 and 200mm, and the length is generally 2400-3600mm. According to the design drawings of the building, different types of enclosure structures and door and window types can be distinguished, and the products can be cut into standard wall panels, special-shaped wall panels, window sill panels, lintel panels and other products of different sizes by computer control.

The embedded wallboard can be made into different types of solid wallboard, hollow wallboard, aerated wallboard, medicated or health care wallboard and other products according to needs, and can also be applied with various veneers and decorations in the factory. After drying, they shall be packaged and marked separately, transported to the construction site according to the commercial requirements, and then hoisted to each floor. After splitting, the construction machinery shall embed, bond and fix the wall according to the design number.

The embedded high-strength gypsum wallboard is especially suitable for the construction of modern high-rise buildings and for the mechanized and standardized installation process. Fast construction speed, high efficiency and good quality uniformity.

2. Basic production technology

The full-automatic mechanized production line of embedded wallboard is designed by Lucheng gypsum experimental base of China University of mining and technology in cooperation with Jiangsu first industrial design institute, which is unprecedented at home and abroad.

The embedded high-strength gypsum wallboard production line adopts high-precision, fixed professional equipment and continuous casting molding method. According to the actual needs of the construction project, through computer setting, the board can be continuously produced and cut into large gypsum boards, gypsum slats, gypsum lintel boards, gypsum insulation boards or gypsum blocks of any width and length. It can also be screened, reinforced, faced and grooved according to the user's requirements to produce high-performance Multi purpose gypsum functional wall plate.

Embedded high-strength gypsum wallboard, the cross section of the product is rectangular, and the wall board with thickness greater than 80mm can be built with rounded square holes; The wallboard with thickness less than 80mm is generally solid wallboard, which can be gypsum ceramsite board, slag board, foam board, or layered pouring, with light foamed insulation interlayer in the middle.

3. Performance and characteristics of wallboard

(1) The source of raw materials is wide. Embedded high-strength gypsum wallboard can use high-strength gypsum powder produced by natural gypsum, desulfurized gypsum, phosphogypsum and other gypsum raw materials as raw materials.

(2) Freely adjust the cutting size. Not only can the thickness and width of gypsum board be adjusted arbitrarily, but also the length and width can be cut freely, which can meet the requirements of wall engineering for the diversification of plate size; In addition, the pressing grooves in the longitudinal and transverse directions of the plate can also make it easy to cut on site.

(3) Good mechanical properties. Through the reinforcement and toughening measures such as mesh distribution and reinforcement, not only can meet the strength requirements of large-span wall for gypsum board, but also can improve the stability and durability of the wall.

(4) High utilization rate of thermal energy and low consumption of thermal energy and electric energy.

(5) The production line is automatically controlled by computer, and the internal quality and appearance quality of the products are good.

(6) Strong operability, fast construction speed, good construction quality and high economic benefits.

Partition wall

The partition wall is a wall assembled by using high-strength gypsum profiled board, connectors and bonded gypsum through splicing, inlaying, bonding, decoration (or pasting) and other operations. The partition wall generally has functions such as bookcase, closet, wardrobe, storage room, flower rack and antique rack.

High strength gypsum profiled board is odorless, tasteless, clean and environmental friendly. It has excellent characteristics such as high strength, no deformation, no moth, no mildew, fire prevention, flame retardancy and good mechanical properties. It is a superior partition wall material.

1. High strength gypsum profiled board

The high-strength gypsum profiled board is a multi-purpose paperless gypsum board with high-strength gypsum as the main cementitious material, which is added with various functional materials, fiber-reinforced materials, and admixtures according to the optimal formula, and is produced continuously with high quality through an automated large-scale industrial production line.

According to different functional materials and admixtures, gypsum profiled board has different types such as fiberboard, sawdust board, rice husk board, bamboo wire board, slag board, etc.

2. Purpose and usage

Gypsum profiled board, compared with paper faced gypsum board, saves two layers of face protection paper with high cost and poor fire resistance. It is a new product in the board industry. It has good performance, beautiful appearance, excellent comprehensive performance, high impact resistance and mechanical properties, strong internal bonding, outstanding moisture-proof, waterproof, fire-proof and insulation characteristics, green, environmental protection, non-toxic and non combustible, and also has sound insulation, thermal insulation Fire protection, anti-static, insulation, anti-corrosion and other excellent performance.

Gypsum profiled board can not only be used to make partition wall, but also is the preferred material for modern building dry powder coated wall, thermal insulation floor, ceiling and wall hanging silencing board; It can also be used for fire partition, fire door, indoor furniture, wall hanging, workbench, etc. gypsum profiled board has good thermal insulation, sound insulation, flatness and high wall engineering quality.

3. Production technology

The production technology of gypsum profiled board is a new technology innovated and developed by China on the basis of digesting and absorbing the reasonable components of foreign advanced technology and combining with domestic advanced production technology and formula.

The main raw material of gypsum profiled board is high-strength gypsum, which can be produced entirely by natural ore, and can also be produced wholly or partially by industrial by-product gypsum.

The production process of gypsum profiled board is as follows: firstly, gypsum raw materials are converted into high-strength gypsum, then functional materials, admixtures, water and chemical additives are added according to the design formula, evenly mixed, and then distributed to the paver. After the pressing, curing, drying, trimming, grinding, polishing, carving, and surface coating are completed in sequence, the product will become a product after passing the inspection.

According to the different thickness of plates, the stacking height is 800-1000mm. After stacking and packaging, the plates are transported to the product warehouse by forklift for stacking, numbering and sales.

Composite wall

Keel composite wall is a composite wall constructed by fixing metal or wood keel in the middle and fixing gypsum board on the front and back sides. At present, the gypsum board used is mainly paper gypsum board, and the non paper gypsum board is rarely used. However, at present, the demand for non paper gypsum board in medium and high-grade wall buildings is very urgent. With the progress of society and the improvement of construction standards, the market of high-strength non paper gypsum composite wall will become larger and larger.

1. Paper faced gypsum board

As we all know, the raw materials for the production of gypsum board are β D-type building gypsum powder has low mechanical properties. The paper faced gypsum board has been widely used in keel composite wallboard. The general practice is to install wood keel or metal keel in the middle of the wall, fix the paper faced gypsum board on both sides of the keel, and then caulk, putty and paint to make the wall.

At present, the composite wall panels assembled by gypsum board and keel are generally only used for simple partition walls with low requirements. The main reasons are:

(1) The mechanical property of gypsum board is poor, and it is easy to break and pierce holes, and the safety of the room is poor;

(2) The sound insulation performance of the composite wall of the middle keel + two layers of paper faced gypsum board can not reach 38dB, which can not meet the requirements of room sound insulation;

(3) Poor appearance quality such as wall flatness;

(4) In case of fire, the paper faced gypsum board cover paper will be pasted and smoke, which is not considered as fire-proof material;

(5) In case of wet environment, there is hidden danger of paper falling off;

(6) A considerable number of gypsum plasterboards are produced with raw materials of unprocessed industrial by-product gypsum, which objectively has pollution hazards.

2. High strength paperless gypsum wallboard

In recent years, the wall constructed by using high-strength paperless gypsum board and keel with a thickness of 20-25mm is favored. This is because the wall composed of high-strength paperless gypsum board and keel has a beautiful appearance and higher use value, and the cost does not exceed 20%, but it completely avoids the disadvantages of paperless gypsum board and keel composite wall board, and becomes the first choice of medium and high-grade walls.

There will be many different types of high-strength paperless gypsum board in the future. At present, the innovative design mainly includes the following types:

(1) Cast in wall panel

The cast high-strength gypsum wallboard is a wall board that is cast and formed by using 400 # or more high-strength gypsum, compounded with some mineral materials, fiber materials, or treated industrial and agricultural wastes and wastes, as well as a small amount of modified and gain materials, and evenly pulping.

The plate thickness is generally 20-25mm, and the standard plate size is 1200 × 900mm； one thousand and five hundred × 900mm； The surface can be divided into smooth type and pattern type, which can meet different finishing requirements.

The cast-in-place high-strength gypsum wallboard is especially suitable for building high-grade composite walls, and can also be used as floors and decorative boards. With special materials added, it can also be used as waterproof boards, fireproof boards, antimagnetic and insulating boards

Different pouring types can be used to build processing production lines with annual production capacity of 50-500 km2 / A.

(2) Cut type wallboard

Cutting type high-strength gypsum wallboard, which can use more than 400 # α Type I high-strength gypsum, or special type II anhydrous gypsum can be used. Some mineral gradation, color matching granular materials, fiber materials, and a small amount of waterproof, health care, pigment and fragrance materials can be mixed. After uniform pulping, it is poured into a huge block material. After hardening and molding, it is cut into required wall plates according to the set thickness. Later grinding, polishing or carving can also be carried out as required.

The plate thickness is generally 15-50mm, and can be freely cut according to the set thickness; The plate size is generally 600-3600mm long; The width is 80-1200mm. The surface can be polished or non polished to meet different finishing requirements.

Cutting type high-strength gypsum wallboard is generally similar to colored terrazzo. It can be made in colorful colors. It is especially suitable for window sill plate of buildings, decorative plate under lintel, decorative plate and cover plate of door opening and window opening, and decorative plate of elevator shaft and cable shaft. Of course, it can also be used for wallboard, floor and ceiling.

Different pouring types can be used to build processing production lines with annual production capacity of 10-100 km2 / A.

3. Composite functional materials

Type II anhydrous gypsum and α Type a semi water high strength gypsum, even β Type a hemihydrate gypsum is mixed in different proportions, and then mixed with mineral materials, functional materials and chemical materials in different proportions to make various composite high-strength functional materials.

Composite high-strength functional materials can be widely used in the production of various wallboards, and can also be used as coating and finishing materials for various walls, floors and ceilings.

Embedded wall

The built-in wall is a wall that is built by using the built-in high-strength gypsum wallboard and masonry gypsum, and is dried and fixed after splicing, inlaying, bonding, plastering (or pasting) and other operations.

1. Type and purpose of wallboard

The embedded high-strength gypsum wallboard is a large-scale high-strength gypsum board which is made of 400 # or more high-strength gypsum powder as the main raw material, mixed with a certain amount of harmless industrial waste residue, or agricultural waste such as rice husk, sawdust, bamboo scraps and cotton stalks, and formed by scientific formula and mechanization. The width of the product is 1200mm, the thickness is freely set between 80 and 200mm, and the length is generally 2400-3600mm. According to the design drawings of the building, different types of enclosure structures and door and window types can be distinguished, and the products can be cut into standard wall panels, special-shaped wall panels, window sill panels, lintel panels and other products of different sizes by computer control.

The embedded wallboard can be made into different types of solid wallboard, hollow wallboard, aerated wallboard, medicated or health care wallboard and other products according to needs, and can also be applied with various veneers and decorations in the factory. After drying, they shall be packaged and marked separately, transported to the construction site according to the commercial requirements, and then hoisted to each floor. After splitting, the construction machinery shall embed, bond and fix the wall according to the design number.

The embedded high-strength gypsum wallboard is especially suitable for the construction of modern high-rise buildings and for the mechanized and standardized installation process. Fast construction speed, high efficiency and good quality uniformity.

2. Basic production technology

The full-automatic mechanized production line of embedded wallboard is designed by Lucheng gypsum experimental base of China University of mining and technology in cooperation with Jiangsu first industrial design institute, which is unprecedented at home and abroad.

The embedded high-strength gypsum wallboard production line adopts high-precision, fixed professional equipment and continuous casting molding method. According to the actual needs of the construction project, through computer setting, the board can be continuously produced and cut into large gypsum boards, gypsum slats, gypsum lintel boards, gypsum insulation boards or gypsum blocks of any width and length. It can also be screened, reinforced, faced and grooved according to the user's requirements to produce high-performance Multi purpose gypsum functional wall plate.

Embedded high-strength gypsum wallboard, the cross section of the product is rectangular, and the wall board with thickness greater than 80mm can be built with rounded square holes; The wallboard with thickness less than 80mm is generally solid wallboard, which can be gypsum ceramsite board, slag board, foam board, or layered pouring, with light foamed insulation interlayer in the middle.

3. Performance and characteristics of wallboard

(1) The source of raw materials is wide. Embedded high-strength gypsum wallboard can use high-strength gypsum powder produced by natural gypsum, desulfurized gypsum, phosphogypsum and other gypsum raw materials as raw materials.

(2) Freely adjust the cutting size. Not only can the thickness and width of gypsum board be adjusted arbitrarily, but also the length and width can be cut freely, which can meet the requirements of wall engineering for the diversification of plate size; In addition, the pressing grooves in the longitudinal and transverse directions of the plate can also make it easy to cut on site.

(3) Good mechanical properties. Through the reinforcement and toughening measures such as mesh distribution and reinforcement, not only can meet the strength requirements of large-span wall for gypsum board, but also can improve the stability and durability of the wall.

(4) High utilization rate of thermal energy and low consumption of thermal energy and electric energy.

(5) The production line is automatically controlled by computer, and the internal quality and appearance quality of the products are good.

(6) Strong operability, fast construction speed, good construction quality and high economic benefits.

Partition wall

The partition wall is a wall assembled by using high-strength gypsum profiled board, connectors and bonded gypsum through splicing, inlaying, bonding, decoration (or pasting) and other operations. The partition wall generally has functions such as bookcase, closet, wardrobe, storage room, flower rack and antique rack.

High strength gypsum profiled board is odorless, tasteless, clean and environmental friendly. It has excellent characteristics such as high strength, no deformation, no moth, no mildew, fire prevention, flame retardancy and good mechanical properties. It is a superior partition wall material.

1. High strength gypsum profiled board

The high-strength gypsum profiled board is a multi-purpose paperless gypsum board with high-strength gypsum as the main cementitious material, which is added with various functional materials, fiber-reinforced materials, and admixtures according to the optimal formula, and is produced continuously with high quality through an automated large-scale industrial production line.

According to different functional materials and admixtures, gypsum profiled board has different types such as fiberboard, sawdust board, rice husk board, bamboo wire board, slag board, etc.

2. Purpose and usage

Gypsum profiled board, compared with paper faced gypsum board, saves two layers of face protection paper with high cost and poor fire resistance. It is a new product in the board industry. It has good performance, beautiful appearance, excellent comprehensive performance, high impact resistance and mechanical properties, strong internal bonding, outstanding moisture-proof, waterproof, fire-proof and insulation characteristics, green, environmental protection, non-toxic and non combustible, and also has sound insulation, thermal insulation Fire protection, anti-static, insulation, anti-corrosion and other excellent performance.

Gypsum profiled board can not only be used to make partition wall, but also is the preferred material for modern building dry powder coated wall, thermal insulation floor, ceiling and wall hanging silencing board; It can also be used for fire partition, fire door, indoor furniture, wall hanging, workbench, etc. gypsum profiled board has good thermal insulation, sound insulation, flatness and high wall engineering quality.

3. Production technology

The production technology of gypsum profiled board is a new technology innovated and developed by China on the basis of digesting and absorbing the reasonable components of foreign advanced technology and combining with domestic advanced production technology and formula.

The main raw material of gypsum profiled board is high-strength gypsum, which can be produced entirely by natural ore, and can also be produced wholly or partially by industrial by-product gypsum.

The production process of gypsum profiled board is as follows: firstly, gypsum raw materials are converted into high-strength gypsum, then functional materials, admixtures, water and chemical additives are added according to the design formula, evenly mixed, and then distributed to the paver. After the pressing, curing, drying, trimming, grinding, polishing, carving, and surface coating are completed in sequence, the product will become a product after passing the inspection.

According to the different thickness of plates, the stacking height is 800-1000mm. After stacking and packaging, the plates are transported to the product warehouse by forklift for stacking, numbering and sales.

Composite wall

Keel composite wall is a composite wall constructed by fixing metal or wood keel in the middle and fixing gypsum board on the front and back sides. At present, the gypsum board used is mainly paper gypsum board, and the non paper gypsum board is rarely used. However, at present, the demand for non paper gypsum board in medium and high-grade wall buildings is very urgent. With the progress of society and the improvement of construction standards, the market of high-strength non paper gypsum composite wall will become larger and larger.

1. Paper faced gypsum board

As we all know, the raw materials for the production of gypsum board are β D-type building gypsum powder has low mechanical properties. The paper faced gypsum board has been widely used in keel composite wallboard. The general practice is to install wood keel or metal keel in the middle of the wall, fix the paper faced gypsum board on both sides of the keel, and then caulk, putty and paint to make the wall.

At present, the composite wall panels assembled by gypsum board and keel are generally only used for simple partition walls with low requirements. The main reasons are:

(1) The mechanical property of gypsum board is poor, and it is easy to break and pierce holes, and the safety of the room is poor;

(2) The sound insulation performance of the composite wall of the middle keel + two layers of paper faced gypsum board can not reach 38dB, which can not meet the requirements of room sound insulation;

(3) Poor appearance quality such as wall flatness;

(4) In case of fire, the paper faced gypsum board cover paper will be pasted and smoke, which is not considered as fire-proof material;

(5) In case of wet environment, there is hidden danger of paper falling off;

(6) A considerable number of gypsum plasterboards are produced with raw materials of unprocessed industrial by-product gypsum, which objectively has pollution hazards.

2. High strength paperless gypsum wallboard

In recent years, the wall constructed by using high-strength paperless gypsum board and keel with a thickness of 20-25mm is favored. This is because the wall composed of high-strength paperless gypsum board and keel has a beautiful appearance and higher use value, and the cost does not exceed 20%, but it completely avoids the disadvantages of paperless gypsum board and keel composite wall board, and becomes the first choice of medium and high-grade walls.

There will be many different types of high-strength paperless gypsum board in the future. At present, the innovative design mainly includes the following types:

(1) Cast in wall panel

The cast high-strength gypsum wallboard is a wall board that is cast and formed by using 400 # or more high-strength gypsum, compounded with some mineral materials, fiber materials, or treated industrial and agricultural wastes and wastes, as well as a small amount of modified and gain materials, and evenly pulping.

The plate thickness is generally 20-25mm, and the standard plate size is 1200 × 900mm； one thousand and five hundred × 900mm； The surface can be divided into smooth type and pattern type, which can meet different finishing requirements.

The cast-in-place high-strength gypsum wallboard is especially suitable for building high-grade composite walls, and can also be used as floors and decorative boards. With special materials added, it can also be used as waterproof boards, fireproof boards, antimagnetic and insulating boards

Different pouring types can be used to build processing production lines with annual production capacity of 50-500 km2 / A.

(2) Cut type wallboard

Cutting type high-strength gypsum wallboard, which can use more than 400 # α Type I high-strength gypsum, or special type II anhydrous gypsum can be used. Some mineral gradation, color matching granular materials, fiber materials, and a small amount of waterproof, health care, pigment and fragrance materials can be mixed. After uniform pulping, it is poured into a huge block material. After hardening and molding, it is cut into required wall plates according to the set thickness. Later grinding, polishing or carving can also be carried out as required.

The plate thickness is generally 15-50mm, and can be freely cut according to the set thickness; The plate size is generally 600-3600mm long; The width is 80-1200mm. The surface can be polished or non polished to meet different finishing requirements.

Cutting type high-strength gypsum wallboard is generally similar to colored terrazzo. It can be made in colorful colors. It is especially suitable for window sill plate of buildings, decorative plate under lintel, decorative plate and cover plate of door opening and window opening, and decorative plate of elevator shaft and cable shaft. Of course, it can also be used for wallboard, floor and ceiling.

Different pouring types can be used to build processing production lines with annual production capacity of 10-100 km2 / A.

(3) Continuous forming wallboard

Continuous forming high-strength paperless gypsum board can be divided into single-layer and multi-layer. The production process of single-layer screened gypsum board is relatively simple, but the gypsum board is easy to deflect and deform, affecting the use effect; The process of high-strength gypsum board with multi-layer reinforced interlayer is complex, but the gypsum board is light in weight, not easy to deform and has good use effect.

The plate thickness is generally 10-50mm, which can be freely adjusted according to the set thickness; Plate type width 900 ~ 1200mm; The length is 2400 ~ 3600mm, and it is cut according to the setting. The surface of the plate can be smooth and embossed.

Continuous molding high-strength gypsum board, single-layer is mainly used for building wallboard and decorative board; The high-grade board of the reinforcement sandwich can also be used as partition board, furniture board, fire door, ventilation pipe, etc.

With different production line equipment, the annual production capacity can reach 5-30 mm2 / A.

Cast in situ wall

The cast-in-situ wall generally needs to be installed on site, or move the mold box, hang the net, pull the steel cable, or install the printing machine. Therefore, the cast-in-situ wall is also a type of prefabricated wall.

The cast-in-situ wall generally refers to the construction technology that uses various composite high-strength gypsum functional materials as the main raw materials, adds water to prepare slurry at the construction site, pumps it to the working face, and directly forms the building wall through field operations such as mold box pouring, mesh spraying, mechanical printing, surface finishing, etc.

The cast-in-place wall has many advantages, such as high mechanization, automation and continuity, fast construction speed, good wall structure, not easy to deform and crack, good reliability and durability, low construction cost and good investment benefit, and will certainly become the main form of wall construction in the future.

1. Mold box type

According to different types of formwork box, the formwork box type cast-in-situ wall has the following different types:

(1) Detachable assembling formwork: it is a construction method that adopts flat, solid and non adhesive formwork to close into a box, then reliably fix the two sides, inject gypsum slurry, rapidly form gypsum wall, then remove the mold, then paint and tidy the wall.

The advantages of this construction method are that the same mold can be used for different wall construction, less mold occupation and investment

Less cost; The disadvantages are that the workload of mold installation, disassembly and cleaning is large, the workload of wall finishing is also large, and the labor cost is high.

(2) Permanent formwork: it uses 10-15mm high-strength paperless gypsum board as the permanent formwork, with the surface facing inward and the surface facing outward. It is pointed with bonded gypsum, sealed into a box, and then the two sides of the wall board are reliably supported and fixed. After injecting gypsum slurry, the gypsum wall is formed. The wall and the gypsum mold board are hardened into one body, and the formwork is the permanent wall without removing the formwork.

The advantages of permanent formwork are that it does not need to dismantle and clean the formwork, and the workload of wall finishing is greatly reduced, and the labor cost is low; The disadvantage is that the investment cost of gypsum formwork needs to be increased.

(3) Mobile formwork: as the name implies, the mobile formwork is an integral formwork box designed according to the wall structure size, and the lower part is equipped with universal rollers to move or position.

The movable formwork can be divided into one-sided and two-sided. The two-sided formwork is actually a movable formwork box. The height, width and thickness of the formwork box can be adjusted according to the needs. The formwork box can reserve door holes and window holes, and arrange cables, water pipes, potential boxes, etc. the formwork is made of rigid and non adhesive materials. The surrounding of the formwork box is bonded with the wall and column to prevent slurry leakage and slurry leakage during pouring.

The advantages of mobile formwork are that it does not need to manually install, disassemble and clean the mold repeatedly, with low labor cost and low labor intensity. The disadvantage is that the mold investment is high.

2. Spray type

Spray type cast-in-situ wall also has the following different types:

(1) Hanging net spraying. It is to hang and fix metal or polymer wall net materials in the wall holes to be constructed, spray the interface materials, then spray the plastering gypsum mortar, and build the wall after the two sides are plastered.

According to different needs of thermal insulation and sound insulation, different forms of one-layer mesh, two-sided spraying, or two-layer mesh and one-sided spraying can be adopted.

(2) Steel suspension cable spraying. For the walls with high seismic requirements or large space, the steel suspension cable can be tensioned at the wall hole to be constructed, then the wall mesh material can be laid, and then the wall can be sprayed.

(3) Sandwich coating. It is to arrange and fix light plates such as foam board in the wall hole to be constructed. Hollow paper pipes and plastic pipes can also be used. After coating the interface materials, plastering gypsum mortar is sprayed. After the front and rear surfaces are plastered, the sandwich (or hollow) cast-in-situ wall is formed.

3. Printing type

Printing cast-in-situ wall is a new construction technology rising in recent years. It is like swallows build nests and bees build nests. It is also similar to the current viaduct construction. Slurry materials are applied, continuously injected and condensed, and grow into walls in the continuous gradual process.

It is well known that high strength gypsum, especially α Type a semi water high strength gypsum with fast setting