CN116446561B - Double-spliced superimposed shear wall and construction method thereof - Google Patents
Double-spliced superimposed shear wall and construction method thereof Download PDFInfo
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- CN116446561B CN116446561B CN202310693411.2A CN202310693411A CN116446561B CN 116446561 B CN116446561 B CN 116446561B CN 202310693411 A CN202310693411 A CN 202310693411A CN 116446561 B CN116446561 B CN 116446561B
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- 238000010276 construction Methods 0.000 title claims abstract description 15
- 239000004567 concrete Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims 3
- 239000010410 layer Substances 0.000 abstract description 10
- 239000011229 interlayer Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 abstract description 2
- 210000003205 muscle Anatomy 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
- E04B2/64—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
- E04B2/64—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete
- E04B2/66—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete characterised by special cross-section of the elongated members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
- E04B2/56—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members
- E04B2/64—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete
- E04B2/68—Load-bearing walls of framework or pillarwork; Walls incorporating load-bearing elongated members with elongated members of concrete made by filling-up wall cavities
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0636—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
Abstract
The invention discloses a double-spliced superimposed shear wall, which comprises: a pair of prefabricated wallboards, a plurality of grooves are formed in the opposite side walls; the first horizontal ribs penetrate through the grooves on the prefabricated wall boards respectively; the vertical ribs are respectively penetrated on the grooves on the pair of prefabricated wallboards, a plurality of clamping pieces are arranged on the vertical ribs at intervals, the clamping pieces are provided with bayonets, and the bayonets are clamped on the pair of first horizontal ribs; the grooves are filled with a plurality of concrete layers. The invention has the beneficial effects of light dead weight, quick and convenient connection of vertical ribs and tight interlayer connection. The invention provides a construction method of a double-spliced superimposed shear wall, which comprises the following steps: hoisting a pair of prefabricated wallboards to a preset position; extending the vertical ribs into the grooves to a preset depth, and rotating the vertical ribs to enable the clamping pieces to be clamped on the first horizontal ribs; concrete is poured into the grooves. The method has the advantages of light hoisting, quick and convenient connection of the vertical ribs, tight interlayer connection and no formwork support in wall construction.
Description
Technical Field
The invention relates to the technical field of assembled buildings. More particularly, the invention relates to a double-spliced superimposed shear wall and a construction method thereof.
Background
The shear wall is an important component of an assembled high-rise and super high-rise concrete building, and at present, the assembled concrete shear wall at home and abroad mainly adopts two modes, namely a full-section precast reinforced concrete shear wall and a double-sided superposed shear wall. The full-section precast reinforced concrete shear wall is large in size, single components are large in mass, transportation and hoisting are inconvenient, horizontal and vertical splicing structures among the precast components are complex, the precision requirement is high, and the structural stress performance and the integrity are poor. The double-sided superimposed shear wall is a semi-prefabricated and semi-cast-in-situ concrete structure, and has the advantages of cast-in-situ and prefabricated concrete structures, but still has the problems of complex processing and manufacturing, inconvenient hoisting and transportation, large connection difficulty of distributed reinforcing steel bars and the like. When the prefabricated wall is adopted to construct the concrete modularized house, the horizontal and vertical connection between the module units is complex, the corner connection is generally adopted, the upper and lower module units are connected by sleeve grouting, and the left and right module units are provided with steel connecting plates; or reserving post-pouring sections at the corners of the module units, and pouring concrete on site after hoisting in place to realize connection. The connection mode is complex.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a double-split stacked shear wall comprising:
the prefabricated wall boards are oppositely arranged, a plurality of grooves are formed in the opposite side walls of the prefabricated wall boards, and the grooves are arranged along the vertical direction;
the first horizontal ribs penetrate through grooves in the prefabricated wall boards in the horizontal direction respectively, and are arranged at intervals in the vertical direction;
the vertical ribs penetrate through grooves in the prefabricated wallboards in the vertical direction, a plurality of clamping pieces are arranged on the vertical ribs at intervals, clamping openings are formed in the clamping pieces, and the clamping openings on each clamping piece are clamped on the first horizontal ribs;
and the concrete layers are filled in the grooves.
Preferably, the prefabricated wallboard further comprises a plurality of pairs of second horizontal ribs and a plurality of pairs of vertical distribution ribs, wherein the plurality of pairs of second horizontal ribs penetrate through one sides of the prefabricated wallboards facing away from each other along the horizontal direction, the plurality of pairs of second horizontal ribs are arranged at intervals along the vertical direction, the plurality of pairs of vertical distribution ribs penetrate through one sides of the prefabricated wallboards facing away from each other along the vertical direction, and the plurality of pairs of vertical distribution ribs are arranged at intervals along the horizontal direction.
Preferably, the grooves are semi-cylindrical-like, and two opposing grooves on a pair of prefabricated wall panels form a cylinder-like shape.
Preferably, the clamping piece comprises an L-shaped rod with one end fixed on the vertical rib and a clamping rod fixed on the L-shaped rod, a bayonet is formed by the tail end of the L-shaped rod and the clamping rod, the bayonet is clamped on a pair of first horizontal ribs, and the horizontal length of the clamping piece is smaller than the sum of the depths of the two grooves.
Preferably, the clamping member is horizontally arranged.
Preferably, the distance between two adjacent grooves on the same prefabricated wallboard is 2-5 times of the distance between the vertical distribution ribs, the width of each groove is equal to the thickness of two prefabricated wallboards minus 50-100 mm, and the depth is equal to the thickness of the prefabricated wallboards minus 25-50 mm.
Preferably, the distance between two adjacent first horizontal ribs on the same prefabricated wallboard is 3-5 times the thickness of the prefabricated wallboard.
Preferably, the distance between two adjacent second horizontal ribs on the same prefabricated wallboard is 100-300 mm.
Preferably, the open end of the bayonet is slightly larger than the closed end thereof.
The construction method of the double-spliced superimposed shear wall comprises the following steps:
hoisting a pair of prefabricated wallboards to a preset position, wherein the first horizontal rib and/or the second horizontal rib are prefabricated and fixed in the prefabricated wallboards;
step two, each pair of vertical ribs extend into a pair of grooves relatively along the vertical direction, the clamping piece is kept not to be contacted with the first horizontal ribs when the vertical ribs extend downwards, and the vertical ribs are rotated when the vertical ribs extend downwards to a preset depth, so that the clamping piece is clamped on the pair of first horizontal ribs;
and thirdly, pouring concrete into the grooves, and forming the concrete layer after the preset strength is achieved.
The invention at least comprises the following beneficial effects:
firstly, the invention can solve the technical problems of heavy weight, inconvenient vertical rib connection and weak interlayer connection of the conventional precast shear wall. The invention has the advantages of light dead weight, quick and convenient connection of vertical ribs (vertical pull connection ribs), tight connection of the interlayer shear wall and no formwork support of the wall body.
The second and concrete modularized houses are generally connected by adopting corners, the upper and lower layer module units are connected by adopting sleeve grouting, and the left and right module units are provided with steel connecting plates; or reserving post-pouring sections at the corners of the module units, and pouring concrete on site after hoisting in place to realize connection. The connection mode is complex, and the problem of horizontal and vertical connection of the module units is solved at one time by adopting the splicing method.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of a horizontal cross section of the prefabricated wall panel according to one embodiment of the present invention;
FIG. 2 is a diagram showing the horizontal relationship between a pair of prefabricated wall panels and the vertical tie bars according to one embodiment of the present invention;
FIG. 3 is a diagram showing a horizontal positional relationship between a pair of prefabricated wall panels and the vertical tie bars in a clamped state according to one embodiment of the present invention;
FIG. 4 is a schematic view of a horizontal cross section of a shear wall according to one embodiment of the present invention after casting the concrete layer;
FIG. 5 is a schematic longitudinal cross-sectional view of a pair of prefabricated wall panels and the vertical tie bars according to one aspect of the present invention;
FIG. 6 is a top view of a modular unit according to one embodiment of the invention;
fig. 7 is a schematic connection diagram of a module unit according to one embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the orientation or positional relationship indicated by the terms are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
As shown in fig. 1 to 7, the reference numerals in the description of the present invention are defined as follows: prefabricating a wallboard 1; a groove 2; a first horizontal rib 3; vertical ribs 4; a clamping piece 5; a bayonet 51; a concrete layer 6; second horizontal ribs 7; vertical distribution ribs 8; an L-like shaped bar 52; a clamping rod 53; a module unit 100; a floor 9; a side wall 10; gable 11.
As shown in fig. 1 to 7, the present invention provides a double-spliced superimposed shear wall, comprising:
the pair of prefabricated wallboards 1, the relative setting of a pair of prefabricated wallboards 1, a plurality of recesses 2 have been seted up on the lateral wall that a pair of prefabricated wallboards 1 are in opposite directions, recess 2 sets up along vertical direction, and a pair of prefabricated wallboards 1 splice together, forms the shear force wall, and recess 2 splice together on a pair of prefabricated wallboards 1 forms a confined hollow cylinder. In particular, the grooves 2 are arranged to be semi-cylindrical, and two opposite grooves 2 on a pair of prefabricated wall panels 1 form a hollow cylinder like a cylinder.
The first horizontal ribs 3 penetrate through the grooves 2 on the prefabricated wall boards 1 along the horizontal direction, and the first horizontal ribs 3 are arranged at intervals along the vertical direction; the pair of first horizontal ribs 3 are symmetrically penetrated in the closed hollow column along the radial direction and parallel to the splicing surface, and the first horizontal ribs 3 are prefabricated in the hollow column when the prefabricated wallboard 1 is manufactured.
The vertical ribs 4 penetrate through the grooves 2 on the prefabricated wall boards 1 along the vertical direction, a plurality of clamping pieces 5 are arranged on the vertical ribs 4 at intervals, clamping openings 51 are formed in the clamping pieces 5, and the clamping openings 51 on each clamping piece 5 are clamped on the first horizontal ribs 3; the vertical ribs 4 are penetrated in the hollow column along the axial direction and parallel to the splicing surface, and after the vertical ribs 4 reach the required depth, the vertical ribs 4 are rotated along the horizontal direction, so that the clamping pieces 5 are clamped on the side walls of the pair of first horizontal ribs 3 positioned in the same hollow column, the function of positioning the vertical ribs 4 is achieved, and meanwhile, the function of pulling and connecting the pair of first horizontal ribs 3 and then the pair of prefabricated wallboards 1 is also achieved.
Specifically, the clamping piece 5 includes an L-shaped rod 52 with one end fixed on the vertical rib 4 and a clamping rod 53 fixed on the L-shaped rod 52, the end of the L-shaped rod 52 and the clamping rod 53 form a bayonet 51, and the clamping piece 5 has a simple structure and can form a bayonet 51 stably clamped on the pair of first horizontal ribs 3. The horizontal length of the clamping piece 5 is smaller than the sum of the depths of the two grooves 2, so that the clamping piece 5 can conveniently rotate in the hollow cylinder without limitation. The clamping piece 5 is horizontally arranged, so that the extending depth can be estimated conveniently, and the constructors can position and construct conveniently. The opening end of the bayonet 51 is slightly larger than the closed end of the bayonet, so that the bayonet 51 is conveniently clamped outside the pair of first horizontal ribs 3, and the bayonet 51 is clamped on the pair of first horizontal ribs 3 from top to bottom under the action of gravity, so that the clamping and pulling functions are achieved.
The concrete layers 6 are filled in the grooves 2, the cast-in-place concrete casts the first horizontal ribs 3, the grooves 2 and the vertical ribs 4 together, and after hardening, a fixing effect is formed, so that the splicing and fixing effect between the pair of prefabricated wallboards 1 can be remarkably improved.
Further, still include many pairs of second horizontal muscle 7 and many pairs of vertical distribution muscle 8, many pairs of second horizontal muscle 7 wear to locate the one side that a pair of prefabricated wallboard 1 deviates from along the horizontal direction respectively, and many pairs of second horizontal muscle 7 set up along vertical direction interval, and many pairs of vertical distribution muscle 8 wear to locate the one side that a pair of prefabricated wallboard 1 deviates from along vertical direction respectively, and many pairs of vertical distribution muscle 8 set up along horizontal direction interval. The second horizontal ribs 7 and the vertical distribution ribs 8 are prefabricated inside the prefabricated wall panel 1 when the prefabricated wall panel is manufactured. According to the thickness of the prefabricated wall panel 1, the distance and number between the second horizontal ribs 7 and the distance and number between the vertical distribution ribs 8 are set. To improve the shear resistance of the prefabricated wall panel 1 itself.
The distance between two adjacent grooves 2 on the same prefabricated wallboard 1 is 2-5 times of the distance between the vertical distribution ribs 8, the width of each groove 2 is equal to the thickness of two prefabricated wallboards 1 minus 50-100 mm, and the depth is equal to the thickness of the prefabricated wallboard 1 minus 25-50 mm.
The distance between two adjacent first horizontal ribs 3 on the same prefabricated wallboard 1 is 3-5 times the thickness of the prefabricated wallboard 1.
The distance between two adjacent second horizontal ribs 7 on the same prefabricated wallboard 1 is 100-300 mm.
The construction method of the double-spliced superimposed shear wall comprises the following steps:
step one, hoisting a pair of prefabricated wall panels 1 to a preset position, wherein a first horizontal rib 3 and/or a second horizontal rib 7 (usually, the second horizontal rib 7 is required unless the prefabricated wall panels 1 are particularly thin, but the situation is rare) are prefabricated and fixed in the prefabricated wall panels 1;
step two, each pair of vertical ribs 4 extend into a pair of grooves 2 relatively along the vertical direction, the clamping piece 5 is kept not to be contacted with the first horizontal ribs 3 when the vertical ribs 4 extend downwards, and the vertical ribs 4 are rotated when the vertical ribs 4 extend downwards to a preset depth, so that the clamping piece 5 is clamped on the pair of first horizontal ribs 3;
and thirdly, pouring concrete into the grooves 2, and forming the concrete layer 6 after the preset strength is reached.
Examples:
as shown in fig. 7, the reinforced concrete modularized house unit structure is a plan view, and is composed of gable 11, floor 9 and side wall 10, wherein the side wall 10 of the splicing area is formed by splicing the prefabricated wall panel 1 of the invention through the operation of the second step and the third step after the adjacent module units 100 are in place.
The double-spliced superimposed shear wall and the construction method solve the following technical problems:
1. light weight problem: because the spacing groove 2 is arranged, taking a shear wall with the thickness of 200 mm as an example, compared with an integral precast shear wall, the double-spliced superimposed shear wall is split into two precast blocks and partially cast-in-situ, and the weight of a single precast block (precast wallboard 1) is only 32.4% of that of the integral precast shear wall, so that the problem of heavy hoisting weight of precast components in a construction site is remarkably reduced.
2. The connection precision requirement of the vertical distribution ribs 8 is high, and the manufacturing cost is high: the vertical distributing ribs 8 of the prefabricated shear wall are connected by grouting sleeve connection and grout anchor lap joint in a common connection mode, the connection mode has high precision requirement and high manufacturing cost, and by adopting the splicing method provided by the invention, the vertical distributing ribs 8 (vertical pull joint ribs) can realize lap joint anchoring in the groove 2 through post-cast concrete, the precision requirement is low, an additional sleeve or high-strength grouting material is not needed, and the manufacturing cost is low.
3. The concrete modular house unit is complex in horizontal and vertical connection: the concrete modularized house is generally connected by adopting corners, the upper layer module unit and the lower layer module unit are connected by adopting sleeve grouting, and the left module unit and the right module unit 100 are provided with steel connecting plates; or reserving post-pouring sections at corners of the module units 100, and pouring concrete on site after hoisting in place to realize connection. The connection mode is complex, and the problem of horizontal and vertical connection of the module units 100 is solved at one time by adopting the splicing method of the invention.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The construction method of the double-spliced superimposed shear wall is characterized in that the double-spliced superimposed shear wall comprises the following steps:
the prefabricated wall boards are oppositely arranged, a plurality of grooves are formed in the opposite side walls of the prefabricated wall boards, and the grooves are arranged along the vertical direction;
the first horizontal ribs penetrate through grooves in the prefabricated wall boards in the horizontal direction respectively, and are arranged at intervals in the vertical direction;
the vertical ribs penetrate through grooves in the prefabricated wallboards in the vertical direction, a plurality of clamping pieces are arranged on the vertical ribs at intervals, clamping openings are formed in the clamping pieces, and the clamping openings on each clamping piece are clamped on the first horizontal ribs;
a plurality of concrete layers filled in the grooves;
the system comprises a pair of prefabricated wallboards, a plurality of pairs of first horizontal ribs and a plurality of pairs of vertical distribution ribs, wherein the prefabricated wallboards are arranged in a vertical direction, and the prefabricated wallboards are arranged in a vertical direction;
the construction method comprises the following steps:
hoisting a pair of prefabricated wallboards to a preset position, wherein the first horizontal rib and/or the second horizontal rib are prefabricated and fixed in the prefabricated wallboards;
step two, each pair of vertical ribs extend into a pair of grooves relatively along the vertical direction, the clamping piece is kept not to be contacted with the first horizontal ribs when the vertical ribs extend downwards, and the vertical ribs are rotated when the vertical ribs extend downwards to a preset depth, so that the clamping piece is clamped on the pair of first horizontal ribs;
and thirdly, pouring concrete into the grooves, and forming the concrete layer after the preset strength is achieved.
2. The method of constructing a double-sided composite shear wall of claim 1, wherein the grooves are semi-cylindrical and two opposing grooves on a pair of prefabricated wall panels form a cylinder.
3. The construction method of the double-spliced superimposed shear wall according to claim 1, wherein the clamping piece comprises an L-shaped rod with one end fixed on the vertical rib and a clamping rod fixed on the L-shaped rod, the tail end of the L-shaped rod and the clamping rod form a bayonet, the bayonet is clamped on a pair of first horizontal ribs, and the horizontal length of the clamping piece is smaller than the sum of the depths of the two grooves.
4. The method of constructing a double-sided composite shear wall of claim 3, wherein the clip is horizontally disposed.
5. The construction method of the double-spliced superimposed shear wall according to claim 1, wherein the distance between two adjacent grooves on the same prefabricated wall panel is 2-5 times the distance between the vertical distribution ribs, the width of each groove is equal to the thickness of two prefabricated wall panels minus 50-100 mm, and the depth is equal to the thickness of each prefabricated wall panel minus 25-50 mm.
6. The construction method of the double-spliced superimposed shear wall according to claim 1, wherein the distance between two adjacent first horizontal ribs on the same prefabricated wall panel is 3-5 times the thickness of the prefabricated wall panel.
7. The construction method of the double-spliced superimposed shear wall according to claim 1, wherein the distance between two adjacent second horizontal ribs on the same prefabricated wall panel is 100-300 mm.
8. A method of constructing a double-sided composite shear wall as claimed in claim 3, wherein the open end of the bayonet is slightly larger than the closed end thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310693411.2A CN116446561B (en) | 2023-06-13 | 2023-06-13 | Double-spliced superimposed shear wall and construction method thereof |
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| CN202310693411.2A CN116446561B (en) | 2023-06-13 | 2023-06-13 | Double-spliced superimposed shear wall and construction method thereof |
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| CN116446561A CN116446561A (en) | 2023-07-18 |
| CN116446561B true CN116446561B (en) | 2023-09-19 |
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| CA2500682A1 (en) * | 2004-03-16 | 2005-09-16 | Tritex Icf Products, Inc | Prefabricated foam block concrete forms with open tooth connection means |
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| CN116446561A (en) | 2023-07-18 |
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