CN112847744A - Precast concrete member forming method, precast concrete member and assembly type building - Google Patents
Precast concrete member forming method, precast concrete member and assembly type building Download PDFInfo
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- CN112847744A CN112847744A CN202110175920.7A CN202110175920A CN112847744A CN 112847744 A CN112847744 A CN 112847744A CN 202110175920 A CN202110175920 A CN 202110175920A CN 112847744 A CN112847744 A CN 112847744A
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- precast concrete
- concrete member
- pore
- forming module
- forming
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- 239000011178 precast concrete Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000004567 concrete Substances 0.000 claims abstract description 32
- 238000009415 formwork Methods 0.000 claims abstract description 7
- 230000005489 elastic deformation Effects 0.000 claims abstract description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000010606 normalization Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
Abstract
The invention discloses a precast concrete member forming method, a precast concrete member and an assembly type building, and relates to the technical field of assembly type buildings. In the method for forming the precast concrete member, concrete is poured into a formwork with a pore-forming module on a bottom die in a concrete pouring stage, and the precast concrete member is formed after curing; in the demolding stage, the precast concrete member is lifted, the flexible layer attached to the framework of the pore-forming module is stressed to generate elastic deformation, so that the pore-forming module is separated from the precast concrete member, and a through hole is formed in the precast concrete member. The method for forming the precast concrete member does not need to repeatedly install and dismantle the pore-forming module, has simple operation and low construction requirement, can efficiently manufacture the precast concrete member with the preformed hole, and is very favorable for the development of automation, modernization, standardization and normalization of the production of the fabricated building.
Description
Technical Field
The invention relates to the technical field of assembly type buildings, in particular to a precast concrete member forming method, a precast concrete member and an assembly type building.
Background
The assembly type building has the characteristics of green, energy saving, low carbon and environmental protection, is easy to realize building component, building industrialization and industrialization, and is widely applied in China in recent years. The prefabricated building is formed by assembling prefabricated parts (including prefabricated concrete components) on a construction site, is popularized in a large scale in many domestic areas, and the prefabricated concrete components are produced in a large scale, so that holes are required to be reserved on the prefabricated concrete components due to the requirement of site construction.
The forming process of the precast concrete member generally comprises the steps of installing and fixing an embedded part, binding a reinforcement cage, pouring and maintaining concrete, demoulding and hoisting and the like, wherein the existing forming method of the precast concrete member is to install a sleeve or an iron core at the position of a reserved hole, and then take out the sleeve or the iron core to form the hole after the pouring of the concrete is finished. For example, the invention patent application (201710968637.3) discloses a detachable die assembly and a construction method thereof, which is used for manufacturing a prepared hole in a mode that a cross beam is arranged above the position of the prepared hole to fix a sleeve. On one hand, the scheme can not meet the requirement of leakage prevention of the preformed hole, and the preformed hole is plugged later, so that a sleeve in the hole needs to be cleaned up, and a hole is expanded at an outer opening of the preformed hole; on the other hand, the sleeve of the construction preformed hole needs to be fixed by means of a tool, the installation is complex, the construction requirement is high, the efficiency is low, the cost is high, and the sleeve needs to be installed and detached again during construction at every time. Meanwhile, excessive component tooling molds will affect the concrete leveling, finishing and surface molding quality of the components.
In addition, the invention patent application (201710371628.6) discloses a method and a mounting structure for reserving holes on a precast concrete piece, the iron core is fixed on a bottom template through bolts, after the precast concrete piece is processed, the bolts are removed, the iron core is pulled out outwards, and the reserved holes of the precast concrete piece are formed. The iron cores are drawn out one by one when the concrete is initially set, and because the hardness of the iron cores is high, the concrete solidification state needs to be mastered when the iron cores are drawn out, the reserved holes can be damaged carelessly, the structural strength is influenced by the disturbance of the concrete more seriously, the construction requirement is high, the production efficiency is greatly reduced, the iron core needs to be mounted and dismounted again during each construction, the mounting is difficult, the automation degree is low, and in addition, the top of the iron core protrudes in the pouring process, so that the concrete surface around the preformed hole is difficult to be screeded, the flatness control and the impression quality of the surface of the precast concrete component are also influenced, and the hole is formed on the lower surface, namely the outer wall side aperture is small, and on the upper surface, namely the inner wall side aperture is large, so that a hole with low inside and high outside is formed, thus, when the screw prepared holes of the prefabricated parts are attacked by rain, water has a tendency to leak toward the inside of the room, which is disadvantageous in terms of waterproofing.
As described above, the existing precast concrete member molding method and molding die have a great restriction on the development of automation, modernization, standardization and standardization of the assembly type building production.
Disclosure of Invention
The invention provides a method for forming a precast concrete member, which solves the problem that a pore-forming module is repeatedly installed and disassembled in the existing precast concrete member forming process, and improves the production efficiency of the precast concrete member.
In the method for forming the precast concrete member, concrete is poured into a formwork with a pore-forming module on a bottom die in a concrete pouring stage, and the precast concrete member is formed after curing; in the demolding stage, the precast concrete member is lifted, the flexible layer attached to the framework of the pore-forming module is stressed to generate elastic deformation, so that the pore-forming module is separated from the precast concrete member, and a through hole is formed in the precast concrete member.
According to the method for forming the precast concrete member, the hole forming module does not need to be disassembled in the demolding stage, the hole forming module is still remained on the bottom die after being separated from the precast concrete member, the hole forming module does not need to be installed again before the next pouring, the concrete is directly poured into the formwork after the reinforcement cage is bound, the operation is simple, the construction requirement is low, the precast concrete member with the reserved hole can be efficiently manufactured, and the method is very favorable for the development of automation, modernization, standardization and standardization of assembly type building production.
Preferably, in the process of separating the pore-forming module from the precast concrete component, the reinforcing wire between the framework and the flexible layer of the pore-forming module is circumferentially wound on the framework, and a part of the reinforcing wire is embedded in the flexible layer, so that the flexible layer is tightly attached to the framework.
Preferably, the reinforcing wire is wound and tied at the position of the rib of the outer wall of the framework, so that the flexible layer can wrap the part, away from the contact, of the reinforcing wire and the outer wall of the framework.
Preferably, after the concrete is poured, the concrete is finished so that the top of the pore-forming module is flush with the upper surface of the precast concrete member.
Preferably, the pore-forming modules are in the shape of a circular truncated cone and can be easily separated from the precast concrete member, and the pore-forming modules can be designed to have different draft angles.
Preferably, the pore-forming module forms a flaring on the lower surface of the precast concrete member, so that the anti-leakage effect of the precast concrete member is further improved. In the preferred embodiment, the upper surface of the precast concrete unit is the inner wall side, the lower surface of the precast concrete unit is the outer wall side, the hole forming module forms a flaring on the lower surface of the precast concrete unit, i.e., a flaring on the outer wall side, the hole forming module forms a through hole with high inside and low outside, and the flaring on the outer wall side is provided with a waterproof step.
Preferably, the pore-forming modules are arranged close to the side forms of the formwork and are uniformly distributed along the long edge of the bottom form, so that a plurality of preformed holes can be formed at the positions, close to the edges, of the precast concrete members, and the subsequent construction requirements are met.
The invention also provides a precast concrete member which is manufactured by adopting the precast concrete member molding method, and the aperture of the upper surface of the precast concrete member is smaller than that of the lower surface of the precast concrete member. When the precast concrete component is used for assembling the outer wall, the smaller end of the preformed hole is positioned on the surface of the precast concrete component close to the interior, and the larger end of the preformed hole is positioned on the surface of the precast concrete component close to the exterior, so that a certain waterproof gradient is formed, and the waterproof requirement of the preformed hole is met.
Preferably, the prepared hole has a flaring on the lower surface of the precast concrete member, so that the precast concrete member has a better anti-leakage effect.
The invention also provides an assembly type building, and the prefabricated concrete member is adopted, so that the building quality is high, the cost is low, the technical difficulty of leakage prevention of the current assembly type building is solved, and the assembly type building has great significance for the national government and the local government to vigorously popularize the development of the assembly type building.
Compared with the prior art, the forming method of the precast concrete member does not need to repeatedly install and dismantle the pore-forming module, is simple to operate and low in construction requirement, and can efficiently manufacture the precast concrete member with the preformed hole; the precast concrete member is manufactured by the precast concrete member molding method, so that the production efficiency is high, the quality is attractive, and the cost is low; the prefabricated concrete member adopted by the assembly type building has high building quality and low cost, solves the technical difficulty of leakage prevention of the current assembly type building, and has great significance for the national and local governments to vigorously popularize the development of the assembly type building.
Drawings
FIG. 1 is a cross-sectional view of a forming die;
FIG. 2 is a top view of a forming die;
FIG. 3 is a schematic view of a precast concrete unit;
FIG. 4 is a cross-sectional view of a pore-forming module;
FIG. 5 is a schematic view of a pore-forming module skeleton;
FIG. 6 is a schematic view of a pore-forming module.
Detailed Description
The invention is further described with reference to the following examples and the accompanying drawings.
In the method for forming the precast concrete member, concrete is poured into a formwork with a pore-forming module on a bottom die in a concrete pouring stage, and the precast concrete member is formed after curing; in the demolding stage, the precast concrete member is lifted, the flexible layer attached to the framework of the pore-forming module is stressed to generate elastic deformation, so that the pore-forming module is separated from the precast concrete member, and a through hole is formed in the precast concrete member. According to the invention, the pore-forming module does not need to be disassembled in the demoulding stage, the pore-forming module is still remained on the bottom die after being separated from the precast concrete member, the pore-forming module does not need to be installed again before the next pouring, and the concrete is directly poured into the formwork after the reinforcement cage is bound, so that the precast concrete member with the reserved hole can be efficiently manufactured, and the method is very favorable for the development of automation, modernization, standardization and standardization of assembly type building production.
After concrete is poured, the concrete can be vibrated and compacted by utilizing automatic equipment, and the surface of the concrete is subjected to leveling, plastering and galling treatment, so that the production efficiency of the precast concrete component is improved. The concrete is subjected to plastering treatment, so that the top of the pore-forming module is flush with the upper surface of the precast concrete member, namely the height of the pore-forming module above the bottom die is equal to the thickness of the precast concrete member.
The appearance of pore-forming module is the round platform form, can design into different draft inclinations, and in the drawing of patterns stage, the appearance that pore-forming module is the round platform can be separated with precast concrete component easily, and the flexible layer atress of pore-forming module produces elastic deformation moreover, can make the preformed hole not destroyed, has reduced the construction requirement of drawing of patterns.
The forming mold used in the present invention includes a mold casing and a hole forming module, as shown in fig. 1 and 2, wherein the mold casing 100 is composed of a bottom mold 110 and a side mold 120 for receiving poured concrete and forming the external dimension of a precast concrete member, and the hole forming module 200 is fixed to the bottom mold 110 of the mold casing for forming a predetermined hole at a predetermined position of the precast concrete member. The pore-forming modules 200 are disposed near the side forms 120 and are uniformly arranged along the long side of the bottom form 110, such that a plurality of preformed holes 310 are formed at the position of the precast concrete unit 300 near the edge thereof, as shown in fig. 3, the preformed holes 310 generally penetrate through the thickness direction of the precast concrete unit 300, and the preformed holes are used for being matched with screws to fix the precast concrete unit to the support, and then cast-in-situ fixing is performed on two or more precast concrete units fixed at the preset position.
Referring to fig. 4, the pore-forming module 200 may specifically include a skeleton 210, and a flexible layer 220 disposed to cover the skeleton 210; the bottom end of the frame 210 may be provided with a coupling portion 230, and the coupling portion 230 is used to couple the pore-forming module 200 to the bottom mold 110. The frame 210 may be a steel frame, an aluminum alloy frame, a titanium alloy frame, or the like, or may be made of a material with high toughness, such as a plastic-coated steel frame, a glass steel frame, or the like; the flexible layer 220 may be made of a gel material, in particular a silicone material, or a rubber material.
In the process of separating the pore-forming module 200 from the precast concrete unit 300, the flexible layer 220 of the pore-forming module 200 is subjected to a strong axial tension, so in order to improve the bonding force between the flexible layer 220 and the framework 210, i.e. to improve the connection strength between the flexible layer 220 and the framework 210, in this embodiment, the framework 210 may be wrapped with a reinforcing wire 240. In one aspect, the reinforcing wire 240 is wound around the frame 210 and thus tightly connected to the frame 210; on the other hand, the flexible layer 220 can be arranged to cover the reinforcing wire 240, so as to improve the bonding strength between the flexible layer 220 and the reinforcing wire 240, and the flexible layer is tightly adhered to the framework.
The reinforcing thread 240 may be made of cotton thread, wool thread, hemp thread, or organic polymer silk thread with high strength and toughness, such as nylon thread, PE thread, and maraca thread.
Therefore, the reinforcing wire 240 according to the present embodiment can significantly improve the connection strength between the flexible layer 220 and the frame 210, thereby preventing the flexible layer 220 from being separated from the frame 210 to damage the pore-forming module 200 during the separation of the pore-forming module 200 from the precast concrete unit 300.
As a further optimization of the present embodiment, referring to fig. 5, a rib 211 may be disposed on the frame 210 along an axial direction thereof, and when the reinforcing wire 240 is wound around the frame 210 having the rib 211, at least a portion of the reinforcing wire 240 may be disposed apart from an outer surface of the frame 210, so that the flexible layer 220 can completely wrap the portion of the reinforcing wire 240, thereby further improving a connection strength between the flexible layer 220 and the frame 210, and enabling the flexible layer to be tightly attached to the frame.
Referring to fig. 4, the bottom end of the flexible layer 220 may be provided with a step 221, and the bobbin 210 is provided with a flange 215 at a position corresponding to the step 221. The step 221 has a cylindrical structure as shown in fig. 6, and may have a truncated cone-shaped structure. Step 221 is used to form flare 311 on the lower surface of precast concrete member 300, thereby further improving the leakage-proof effect of precast concrete member 300.
The precast concrete member 300 of the present invention is manufactured by the precast concrete member molding method, has a high degree of automation, greatly improves production efficiency, and has beautiful quality and low cost. The pore-forming module 200 has a truncated cone shape, so that the preformed hole 310 on the precast concrete unit 300 is larger at one end and smaller at the other end, that is, the pore diameter of the upper surface of the precast concrete unit 300 is smaller than that of the lower surface thereof. When the precast concrete member 300 is used for assembling an outer wall, the smaller end of the preformed hole 310 is located on the surface of the precast concrete member 300 close to the indoor (i.e., an inner vertical surface), and the larger end of the preformed hole 310 is located on the surface of the precast concrete member 300 close to the outdoor (i.e., an outer vertical surface), so that a certain waterproof gradient is formed, and the waterproof requirement of the preformed hole is met. In addition, since the prepared hole 310 has the flare 311 on the lower surface of the precast concrete member 300, the precast concrete member 300 has a better leakage-proof effect.
The prefabricated concrete member 300 adopted by the assembly type building has high building quality and low cost, solves the technical difficulty of leakage prevention of the current assembly type building, and has great significance for the national and local governments to vigorously popularize the development of the assembly type building.
The above examples are only preferred embodiments of the present invention, it should be noted that: it will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit of the invention, and it is intended that all such modifications and equivalents fall within the scope of the invention as defined in the claims.
Claims (10)
1. A method for forming a precast concrete member is characterized in that: in the concrete pouring stage, pouring concrete into the formwork with the pore-forming module on the bottom die, and curing to form a precast concrete member; in the demolding stage, the precast concrete member is lifted, the flexible layer attached to the framework of the pore-forming module is stressed to generate elastic deformation, so that the pore-forming module is separated from the precast concrete member, and a through hole is formed in the precast concrete member.
2. The precast concrete member molding method according to claim 1, wherein: in the process of separating the pore-forming module from the precast concrete component, the reinforcing wire between the framework and the flexible layer of the pore-forming module is circumferentially wound on the framework, and one part of the reinforcing wire is embedded into the flexible layer, so that the flexible layer is tightly attached to the framework.
3. The precast concrete member molding method according to claim 2, wherein: the reinforcing wire is wound and pricked at the position where the convex rib of the outer wall of the framework is located, so that the flexible layer can wrap the part, away from the contact, of the reinforcing wire and the outer wall of the framework.
4. The precast concrete member molding method according to claim 1, wherein: after the concrete is poured, the concrete is subjected to plastering treatment, so that the top of the pore-forming module is flush with the upper surface of the precast concrete member.
5. The precast concrete member molding method according to claim 1, wherein: the pore-forming module is in the shape of a circular truncated cone and can be easily separated from the precast concrete component.
6. The precast concrete member molding method according to claim 1, wherein: the hole forming mold forms a flare in a lower surface of the precast concrete member.
7. The precast concrete member forming mold according to claim 1, wherein: the pore-forming modules are arranged close to the side dies of the die shell and are uniformly distributed along the long edge of the bottom die.
8. A precast concrete member characterized in that: the precast concrete unit molding method according to any one of claims 1 to 7, wherein the pore diameter of the upper surface of the precast concrete unit is smaller than the pore diameter of the lower surface thereof.
9. The precast concrete member according to claim 8, wherein: the prepared hole has a flare at a lower surface of the precast concrete member.
10. An assembly type building, characterized in that: the precast concrete member according to claim 8 or 9 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175920.7A CN112847744A (en) | 2021-02-09 | 2021-02-09 | Precast concrete member forming method, precast concrete member and assembly type building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175920.7A CN112847744A (en) | 2021-02-09 | 2021-02-09 | Precast concrete member forming method, precast concrete member and assembly type building |
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|---|---|
| CN112847744A true CN112847744A (en) | 2021-05-28 |
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|---|---|---|---|
| CN202110175920.7A Pending CN112847744A (en) | 2021-02-09 | 2021-02-09 | Precast concrete member forming method, precast concrete member and assembly type building |
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| CN (1) | CN112847744A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA16885A (en) * | 1984-02-04 | 1986-04-15 | Dyckerhoff & Widmann Ag | DEVICE FOR ATTACHING A HOLLOW INSTALLATION COMPONENT TO A FORMWORK |
| CN1727152A (en) * | 2004-07-28 | 2006-02-01 | 邱则有 | Die in use for molding component of concrete filled double thin wall |
| CN101318350A (en) * | 2007-06-07 | 2008-12-10 | 邱则有 | Concrete cavity die component forming method |
| CN101456208A (en) * | 2007-12-11 | 2009-06-17 | 杨淑芬 | Forming method sheet material with hollow sandwich layer and die thereof |
| CN201456209U (en) * | 2009-07-13 | 2010-05-12 | 中交第一公路工程局有限公司 | Anchor recess forming mould |
| JP2015221537A (en) * | 2014-05-23 | 2015-12-10 | 鹿島建設株式会社 | Production method of concrete structure, and opening formation member |
-
2021
- 2021-02-09 CN CN202110175920.7A patent/CN112847744A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATA16885A (en) * | 1984-02-04 | 1986-04-15 | Dyckerhoff & Widmann Ag | DEVICE FOR ATTACHING A HOLLOW INSTALLATION COMPONENT TO A FORMWORK |
| CN1727152A (en) * | 2004-07-28 | 2006-02-01 | 邱则有 | Die in use for molding component of concrete filled double thin wall |
| CN101318350A (en) * | 2007-06-07 | 2008-12-10 | 邱则有 | Concrete cavity die component forming method |
| CN101456208A (en) * | 2007-12-11 | 2009-06-17 | 杨淑芬 | Forming method sheet material with hollow sandwich layer and die thereof |
| CN201456209U (en) * | 2009-07-13 | 2010-05-12 | 中交第一公路工程局有限公司 | Anchor recess forming mould |
| JP2015221537A (en) * | 2014-05-23 | 2015-12-10 | 鹿島建設株式会社 | Production method of concrete structure, and opening formation member |
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Application publication date: 20210528 |
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