CN217896917U - Laminated slab of truss and concrete - Google Patents
Laminated slab of truss and concrete Download PDFInfo
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- CN217896917U CN217896917U CN202221499505.3U CN202221499505U CN217896917U CN 217896917 U CN217896917 U CN 217896917U CN 202221499505 U CN202221499505 U CN 202221499505U CN 217896917 U CN217896917 U CN 217896917U
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- concrete
- chord steel
- truss
- bottom plate
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- 239000004567 concrete Substances 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 146
- 239000010959 steel Substances 0.000 claims abstract description 146
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 58
- 239000002131 composite material Substances 0.000 claims description 22
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 11
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The utility model provides a superimposed sheet of truss and concrete, include: a truss structure, a bottom plate and a top plate; the top plate is arranged on the bottom plate in a stacked mode; the truss structure comprises a plurality of upper chord steel pipes longitudinally extending in parallel inside the top plate, a plurality of lower chord steel bars longitudinally extending in parallel inside the bottom plate and web member steel bars; two sides of each upper chord steel pipe are respectively provided with a lower chord steel bar, and two sides of each upper chord steel pipe are respectively connected with a lower chord steel bar arranged on the corresponding side through a plurality of web member steel bars; the upper end of each web member reinforcing steel bar extends into the top plate, and the lower end of each web member reinforcing steel bar extends into the bottom plate; and a plurality of web member reinforcing steel bars between any one upper chord steel pipe and one lower chord reinforcing steel bar are distributed at intervals along the longitudinal direction, and any two adjacent web member reinforcing steel bars in the plurality of web member reinforcing steel bars extend and intersect.
Description
Technical Field
The utility model belongs to the technical field of fixed building and specifically relates to a superimposed sheet of truss and concrete.
Background
The laminated slab is an assembled integral floor slab formed by laminating prefabricated slabs and cast-in-place reinforced concrete layers. The study of laminated slabs started late in China, and started to rise in the 80 s of the last century, and in the 21 st century, due to the rapid development of new materials and new processes, laminated slabs of various new materials, such as fiber reinforced gypsum board-concrete laminated slabs, ceramsite laminated slabs, prestressed lightweight aggregate concrete laminated slabs, etc., were developed. Ordinary concrete superimposed sheet need arrange too much reinforcing bar at the bottom plate in order to satisfy the rigidity demand, and the steel bar engineering is comparatively complicated when making the component, and the difficult preparation of component is because it is inhomogeneous with cement to arrange too much reinforcing bar when leading to concreting to the quality of component has been influenced. The prestressed concrete laminated slab has the disadvantages that the loss of prestress is caused due to the shrinkage and creep of concrete, and the rigidity of the bottom plate is insufficient.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the laminated slab of the truss and the concrete is used for solving the problems of insufficient strength, toughness and rigidity of the existing concrete laminated slab.
The technical scheme is as follows: a composite of a truss and concrete comprising: a truss structure, a bottom plate and a top plate; the top plate is arranged above the bottom plate in a stacked mode; the truss structure comprises a plurality of upper chord steel pipes longitudinally extending in parallel inside the top plate, a plurality of lower chord steel bars longitudinally extending in parallel inside the bottom plate and web member steel bars; two sides of each upper chord steel pipe are respectively provided with a lower chord steel bar, and two sides of each upper chord steel pipe are respectively connected with a lower chord steel bar arranged on the corresponding side through a plurality of web member steel bars; the upper end of each web member reinforcing steel bar extends into the top plate, and the lower end of each web member reinforcing steel bar extends into the bottom plate; and a plurality of web member reinforcing steel bars between any one upper chord steel pipe and one lower chord reinforcing steel bar are distributed along the longitudinal direction at intervals, and any two adjacent web member reinforcing steel bars in the plurality of web member reinforcing steel bars extend and intersect.
Furthermore, the two sides of each upper chord steel pipe are respectively arranged as a first side and a second side, the plurality of web member reinforcing steel bars correspondingly arranged on the first side of each upper chord steel pipe are respectively arranged as first web member reinforcing steel bars, the plurality of web member reinforcing steel bars correspondingly arranged on the second side of each upper chord steel pipe are respectively arranged as second web member reinforcing steel bars, and the first web member reinforcing steel bars and the second web member reinforcing steel bars of each upper chord steel pipe are distributed in a splayed manner.
Furthermore, in the plurality of web member reinforcing steel bars between any one upper chord steel pipe and one lower chord reinforcing steel bar, the connecting positions of the lower ends of any two adjacent web member reinforcing steel bars and the lower chord reinforcing steel bar are spaced, and the connecting positions of the upper ends of any two adjacent web member reinforcing steel bars and the upper chord reinforcing steel bar are spaced.
Furthermore, in a plurality of web member reinforcing steel bars between any one upper chord steel pipe and one lower chord reinforcing steel bar, any two adjacent web member reinforcing steel bars are distributed in a splayed shape.
Furthermore, an interface is arranged between the bottom plate and the top plate, each web member steel bar penetrates through the interface, and the bottom angle formed by the two web member steel bars which are randomly distributed in a splayed shape and the interface is an acute angle.
Furthermore, the bottom plate is a plate structural member made of ultra-high performance concrete.
Further, the top plate is a plate structural member made of recycled concrete.
Furthermore, each lower chord steel bar is fixedly connected with the bottom plate, each upper chord steel tube is fixedly connected with the top plate, the upper end of each web member steel bar is welded with the upper chord steel tube, the lower end of each web member steel bar is welded with the lower chord steel bar, and each web member steel bar is respectively fixedly connected with the bottom plate and the top plate.
Has the beneficial effects that: in the composite slab of the truss and the concrete, the top plate is arranged above the bottom plate in a laminated mode, the truss structure comprises a plurality of upper chord steel tubes extending into the top plate along the longitudinal direction in parallel, a plurality of lower chord steel bars extending into the bottom plate along the longitudinal direction in parallel and a plurality of web member steel bars, a lower chord steel bar is arranged on each of two sides of each upper chord steel tube respectively, two sides of each upper chord steel tube are connected with a lower chord steel bar arranged on the corresponding side through the plurality of web member steel bars respectively, the upper end of each web member steel bar extends into the top plate, the lower end of each web member steel bar extends into the bottom plate, the plurality of web member steel bars between any one upper chord steel tube and one lower chord steel bar are distributed at intervals along the longitudinal direction, and any two adjacent web member steel bars in the plurality of web member steel bars extend and intersect; the top plate and the bottom plate are connected by the truss structure, the rigidity of the truss structure is high, the shearing resistance and the adhesive force of a superposed interface formed between the top plate and the bottom plate are enhanced, the superposed surface formed between the bottom plate and the top plate is prevented from sliding, the phenomenon of cracking of the superposed surface is avoided, the integral rigidity of the superposed plate of the truss and the concrete can be greatly improved, and the rigidity problem of the superposed plate under large span is solved.
Drawings
Fig. 1 is a transverse sectional view of the composite slab of the truss and concrete of the present invention;
fig. 2 is a longitudinal sectional view of a composite slab of a truss and concrete.
Detailed Description
The technical solution provided by the present invention is explained in detail below with reference to the accompanying drawings.
As shown in fig. 1 to fig. 2, the utility model provides a superimposed sheet of truss and concrete, include: the truss structure comprises a truss structure 1, a bottom plate 2 and a top plate 3, wherein the top plate 3 is stacked above the bottom plate 2; the truss structure 1 comprises an upper chord steel pipe 11, a lower chord steel bar 12 and a web member steel bar 13.
A plurality of upper chord steel tubes 11 longitudinally extend in parallel inside the top plate 3, a plurality of lower chord steel bars 12 longitudinally extend in parallel inside the bottom plate 2, and the lower chord steel bars 12 are positioned below the upper chord steel tubes 11; wherein, two sides of each upper chord steel pipe 11 are respectively provided with a lower chord steel bar 12, and two sides of each upper chord steel pipe 11 are respectively connected with a lower chord steel bar 12 arranged at the corresponding side through a plurality of web members 13, namely, a plurality of web members 13 are arranged between any upper chord steel pipe 11 and a lower chord steel bar 12 arranged at the corresponding side; moreover, the upper end of each web member steel bar 13 extends into the top plate 3, and the lower end of each web member steel bar 13 extends into the bottom plate 2; and among a plurality of web member reinforcing bars 13 between any one upper chord steel pipe 11 and one lower chord reinforcing bar 12 arranged at the corresponding side, the plurality of web member reinforcing bars 13 are distributed at intervals along the longitudinal direction, and any two adjacent web member reinforcing bars 13 are arranged in an extending and crossing manner.
In a plurality of web member reinforcing steel bars 13 between any one upper chord steel pipe 11 and one lower chord reinforcing steel bar 12, any two adjacent web member reinforcing steel bars 13 are distributed in a splayed shape, an interface 4 is arranged between the bottom plate 2 and the top plate 3, each web member reinforcing steel bar 13 penetrates through the interface 4, and a bottom angle 5 formed by any two web member reinforcing steel bars 13 distributed in the splayed shape and the interface 4 is an acute angle.
Specifically, as shown in fig. 1, each upper chord steel tube 11 is provided with a first side 111 and a second side 112, and the lower chord steel bars 12 arranged on both sides of each upper chord steel tube 11 are respectively: the lower chord steel bar 12 is positioned on the first side 111 of the upper chord steel pipe 11, and the lower chord steel bar 12 is positioned on the second side 112 of the upper chord steel pipe 11. The web member reinforcing bars 13 connected between the first side 111 of each upper chord steel pipe 11 and the corresponding lower chord reinforcing bar 12 are first web member reinforcing bars 131, the web member reinforcing bars 13 connected between the second side 112 of each upper chord steel pipe 11 and the corresponding lower chord reinforcing bar 12 are second web member reinforcing bars 132, and the first web member reinforcing bars 131 and the second web member reinforcing bars 132 on both sides of each upper chord steel pipe 11 form a regular-eight shape. Each first web member reinforcing steel bar 131 penetrates the interface 4, each second web member reinforcing steel bar 132 penetrates the interface 4, and the bottom angles 5 formed by the first web member reinforcing steel bars 131, the second web member reinforcing steel bars 132 and the interface 4 which are randomly distributed in a splayed shape are acute angles.
In the plurality of web member reinforcing steel bars 13 between any one upper chord steel pipe 11 and one lower chord reinforcing steel bar 12, the lower ends of any two adjacent web member reinforcing steel bars 13 are spaced from the connecting position of the lower chord reinforcing steel bar 12, and the upper ends of any two adjacent web member reinforcing steel bars 13 are spaced from the connecting position of the upper chord reinforcing steel bar 11.
Specifically, as shown in fig. 2, in the plurality of web member bars 13 between any one of the upper-chord steel pipes 11 and one of the lower-chord steel pipes 12, a joint between a lower end of each web member bar 13 and the lower-chord steel pipe 12 is set as a first position 133, a joint between an upper end of each web member bar 13 and the upper-chord steel pipe 11 is set as a second position 134, joints between lower ends of any two adjacent web member bars 13 and the lower-chord steel pipe 12, that is, the first positions 133, are spaced apart, and joints between upper ends of any two adjacent web member bars 13 and the upper-chord steel pipe 11, that is, the second positions 134, are spaced apart. In addition, any two web member reinforcements 13 adjacent to each other among the plurality of web member reinforcements 13 between any one upper-chord steel pipe 11 and one lower-chord reinforcement 12 are distributed in a splayed shape. That is, any two adjacent first web member reinforcements 131 among the plurality of first web member reinforcements 131 between any one upper-chord steel pipe 11 and one lower-chord reinforcement 12 are distributed in a splayed shape; and any two adjacent second web member reinforcing steel bars 132 in the plurality of second web member reinforcing steel bars 132 between any one upper chord steel pipe 11 and one lower chord reinforcing steel bar 12 are distributed in a splayed shape. In a plurality of web member reinforcing steel bars 13 between any one upper chord steel pipe 11 and one lower chord reinforcing steel bar 12, each web member reinforcing steel bar 13 penetrates through the interface 4, and bottom angles 6 formed by any two web member reinforcing steel bars 13 distributed in a splayed shape and the interface 4 are acute angles.
The bottom plate 2 is arranged at the lower end of the truss structure 1, specifically, the bottom plate 2 covers all the lower chord steel bars 12, covers the lower parts of all the web member steel bars 13 and exposes the upper parts of all the web member steel bars 13, each lower chord steel bar 12 is fastened with the bottom plate 2, and the lower part of each web member steel bar 13 is fastened with the bottom plate 2; the bottom plate 2 is a plate structure made of Ultra-High Performance Concrete (UHPC for short). The bottom plate 2 fixes the upper parts of the lower chord steel bars 12 and the web member steel bars 13 through ultra-high performance concrete pouring. The bottom plate 2 is made of ultra-high performance concrete, so that the overall rigidity and the bending resistance bearing capacity of the plate structure can be improved.
The ultra-high performance concrete is a concrete material with ultrahigh strength, high toughness, high durability, high elastic modulus and low porosity, wherein the ultra-high performance concrete is prepared by taking fine sand as an aggregate and mixing a large amount of mineral admixtures such as silica fume and the like, a high-efficiency water reducing agent, mixing water and fine steel fibers, and the prepared bottom plate 2 is favorable for greatly strengthening a weak interface and enhancing the fracture resistance of the weak interface. The ultra-high performance concrete has ultra-high strength, can reduce the dead weight of the structure, has low porosity, has good durability, and reduces the maintenance cost in future use.
The top plate 3 is arranged above the bottom plate 2 in a stacked mode, and the top plate 3 covers all the upper chord steel pipes 11 and the upper portions of all the web member reinforcing steel bars 13; each upper chord steel pipe 11 is fixedly connected with the top plate 3, and the upper part of each web member steel bar 13 is fixedly connected with the top plate 3, namely pouring connection; the top plate 3 is a plate structure made of recycled concrete; that is, the lower parts of the upper chord steel tube 11 and the web member reinforcing steel bars 13 are fixed on the top plate 3 through recycled concrete pouring. The post-cast concrete of the top plate 3 is recycled concrete, namely, waste concrete blocks are crushed, cleaned and graded and then mixed with the gradation according to a certain proportion to partially or completely replace natural aggregates such as sand stones, wherein the natural aggregates are mainly coarse aggregates, and then cement, water and the like are added to form new concrete.
The ultra-high performance concrete has high strength, strong toughness and low porosity, is combined with the truss structure 1, improves the tensile property of the bottom plate 2, has good cohesiveness, improves the durability of the member, has small self shrinkage and creep of the UHPC concrete, and can still ensure the quality of the member in actual use.
Preferably, the upper end of each web member steel bar 13 is welded with the upper chord steel tube 11, and the lower end of each web member steel bar 13 is welded with the lower chord steel bar 12. All the upper chord steel pipes 11 are positioned at the same height; all the lower chord steel bars 12 are positioned at the same height; all the web member reinforcement bars 13, i.e. all the first web member reinforcement bars 131 and all the second web member reinforcement bars 132, are located at the same height.
The preparation process of the composite slab of the truss and the concrete comprises the following steps:
(1) Setting a mould for pouring and forming the bottom plate 2 according to the prefabricated size of the bottom plate 2;
(2) Fully welding the upper chord steel pipe 11, the lower chord steel bar 12 and the web member steel bar 13 by a special welding machine to manufacture the truss structure 1, and placing the truss structure 1 on a mold for preparing a bottom plate according to design requirements;
(3) Pouring the bottom plate 2 by using the ultra-high performance concrete, pouring the ultra-high performance concrete to a preset height by paying attention to vibration and compaction of the ultra-high performance concrete and whether the upper chord steel tube 11 and the lower chord steel bar 12 are subjected to position change or not in the pouring process, combining the lower chord steel bar 12 and the bottom plate 2 together to form a prefabricated thin plate of the truss structure 1 and the bottom plate 2, and then putting the prefabricated thin plate into a steam curing chamber for steam curing;
(4) After the prefabricated thin plate is manufactured and is constructed on site, after hoisting and splicing are completed, the strength of the required recycled concrete is determined, and the recycled concrete is cast on site by a pumping concrete truck to form the composite slab of the truss and the concrete.
In the composite slab of the truss and the concrete, the truss structure 1 is arranged in the composite slab of the truss and the concrete, the rigidity of the truss structure 1 is high, the truss structure 1 plays a role in connecting the upper chord steel pipe 11 and the lower chord steel bar 12, the truss structure 1 is also connected with the concrete between the bottom plate 2 prefabricated by the ultra-high performance concrete and the top plate 3 cast by the recycled concrete, the shearing resistance of a superposed interface formed by the ultra-high performance concrete and the recycled concrete is enhanced, the adhesive force between the ultra-high performance concrete and the recycled concrete is ensured, the superposed surface formed between the ultra-high performance concrete and the recycled concrete is prevented from sliding, and the phenomenon of cracking of the superposed surface is avoided, so that the truss structure 1 can greatly improve the overall rigidity of the composite slab of the truss and the concrete, and the rigidity problem of the large-span lower composite slab is solved.
The composite slab of the truss and the concrete has high strength, high rigidity and high toughness, does not need to arrange too many reinforcing steel bars, does not need to support a formwork and can bear the weight of the truss and the concrete, and therefore, most of time can be saved when a member is manufactured. Meanwhile, the combination of the upper chord steel pipe 11 and the lower chord steel bar 12 can reduce the thickness of the bottom plate 2 and reduce the structural dead weight of the composite slab of the truss and the concrete. The composite slab of the truss and the concrete does not need to be supported and self-bearing in the construction stage, the rigidity requirement in the construction stage can be met by the rigidity of the prefabricated bottom plate 2 part, the construction mode is simple, the construction progress is accelerated, the construction is convenient, the quality of the member can be ensured, and the composite slab is suitable for high-rise buildings and large-bay buildings with higher integral rigidity requirements. And the concrete is poured after the site, namely the top plate 3 adopts the recycled concrete, so that the strength can be ensured, meanwhile, the quantity of the waste concrete is reduced, the problem of environmental pollution caused by the waste concrete can be solved, and meanwhile, the resources are saved.
Claims (8)
1. A composite slab of a truss and concrete, comprising: the structure comprises a truss structure (1), a bottom plate (2) and a top plate (3); the top plate (3) is arranged above the bottom plate (2) in a stacked manner; the truss structure (1) comprises a plurality of upper chord steel pipes (11) which longitudinally extend in parallel in the top plate (3), a plurality of lower chord steel bars (12) which longitudinally extend in parallel in the bottom plate (2) and web member steel bars (13); wherein,
two sides of each upper chord steel pipe (11) are respectively provided with a lower chord steel bar (12), and two sides of each upper chord steel pipe (11) are respectively connected with a lower chord steel bar (12) arranged on the corresponding side through a plurality of web members (13); and also,
the upper end of each web member reinforcing steel bar (13) extends into the top plate (3), and the lower end of each web member reinforcing steel bar (13) extends into the bottom plate (2); and the number of the first and second groups,
a plurality of web member reinforcing steel bars (13) between any one upper chord steel pipe (11) and one lower chord reinforcing steel bar (12) are distributed at intervals along the longitudinal direction, and any two adjacent web member reinforcing steel bars (13) in the plurality of web member reinforcing steel bars (13) extend and intersect.
2. The truss-concrete composite slab as claimed in claim 1, wherein the two sides of each upper chord steel pipe (11) are defined as a first side (111) and a second side (112), the plurality of web member steel bars (13) correspondingly disposed on the first side (111) of each upper chord steel pipe (11) are defined as first web member steel bars (131), the plurality of web member steel bars (13) correspondingly disposed on the second side (112) of each upper chord steel pipe (11) are defined as second web member steel bars (132), and the first web member steel bars (131) and the second web member steel bars (132) of each upper chord steel pipe (11) are arranged in a splayed manner.
3. The truss-concrete composite slab as claimed in claim 2, wherein, of the plurality of web members (13) between any one of the upper chord steel pipes (11) and one of the lower chord steel bars (12), the lower ends of any two adjacent web members (13) are spaced from the connecting position of the lower chord steel bar (12), and the upper ends of any two adjacent web members (13) are spaced from the connecting position of the upper chord steel pipe (11).
4. The truss-concrete composite slab as claimed in claim 3, wherein any two adjacent web members (13) among the plurality of web members (13) between any one of the upper chord steel pipes (11) and one of the lower chord steel bars (12) are arranged in a splayed shape.
5. A composite slab of truss and concrete according to claim 4, wherein an interface (4) is provided between the bottom plate (2) and the top plate (3), each web member reinforcement (13) penetrates the interface (4), and the bottom angle (5) formed by any two web member reinforcements (13) distributed in a splayed shape and the interface (4) is an acute angle.
6. A composite slab of truss and concrete according to claim 1 wherein the bottom plate (2) is a slab structural member made of ultra high performance concrete.
7. A composite slab of truss and concrete according to claim 1 wherein the top plate (3) is a slab structure made of recycled concrete.
8. The truss and concrete composite slab as claimed in claim 1, wherein each lower chord steel bar (12) is fixedly connected with the bottom plate (2), each upper chord steel tube (11) is fixedly connected with the top plate (3), the upper end of each web member steel bar (13) is welded with the upper chord steel tube (11), the lower end of each web member steel bar (13) is welded with the lower chord steel bar (12), and each web member steel bar (13) is respectively fixedly connected with the bottom plate (2) and the top plate (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221499505.3U CN217896917U (en) | 2022-06-16 | 2022-06-16 | Laminated slab of truss and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221499505.3U CN217896917U (en) | 2022-06-16 | 2022-06-16 | Laminated slab of truss and concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217896917U true CN217896917U (en) | 2022-11-25 |
Family
ID=84129891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221499505.3U Active CN217896917U (en) | 2022-06-16 | 2022-06-16 | Laminated slab of truss and concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217896917U (en) |
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2022
- 2022-06-16 CN CN202221499505.3U patent/CN217896917U/en active Active
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