CN220928370U - Support-free composite floor slab - Google Patents

Support-free composite floor slab Download PDF

Info

Publication number
CN220928370U
CN220928370U CN202322497038.1U CN202322497038U CN220928370U CN 220928370 U CN220928370 U CN 220928370U CN 202322497038 U CN202322497038 U CN 202322497038U CN 220928370 U CN220928370 U CN 220928370U
Authority
CN
China
Prior art keywords
concrete
precast
precast concrete
lug
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202322497038.1U
Other languages
Chinese (zh)
Inventor
黄大权
吴宏磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Architecture Design and Research Institute of Tongji University Group Co Ltd
Original Assignee
Architecture Design and Research Institute of Tongji University Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Architecture Design and Research Institute of Tongji University Group Co Ltd filed Critical Architecture Design and Research Institute of Tongji University Group Co Ltd
Priority to CN202322497038.1U priority Critical patent/CN220928370U/en
Application granted granted Critical
Publication of CN220928370U publication Critical patent/CN220928370U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Rod-Shaped Construction Members (AREA)

Abstract

The utility model relates to a support-free composite floor slab, which comprises a precast concrete beam, a concrete composite slab and a concrete cast-in-situ layer; the precast concrete beam comprises a precast concrete beam main body, precast concrete lugs, precast lug reinforcing steel bars and precast beam stirrups; the precast concrete beam main body is provided with precast concrete lugs; the prefabricated lug reinforcing steel bars are buried in the prefabricated concrete beam main body and the prefabricated concrete lug; the lower part of the precast beam stirrup is buried in the precast concrete beam main body, and the upper part extends out of the precast concrete beam main body; the concrete overlapping plate is arranged on the precast concrete beam; the concrete cast-in-situ layer is arranged on the precast concrete beam and the concrete laminated slab; the upper part of the precast beam stirrup is buried in the concrete cast-in-situ layer. Compared with the prior art, the support-free composite floor slab can ensure that no support is arranged under the composite slab during construction, thereby reducing construction measure cost and increasing site construction efficiency, and can realize the requirements of an assembled building on support-free and support-free floor slabs.

Description

Support-free composite floor slab
Technical Field
The utility model relates to the technical field of assembled buildings, in particular to a support-free laminated floor slab.
Background
Truss reinforced concrete composite floor slab has been widely used in assembled building, and truss reinforced concrete is the concrete composite floor slab and need set up full hall support in the construction installation, and after the post-cast concrete is pour and is accomplished and form whole rigidity, demolish the scaffold frame again, lead to site operation slowly, and construction measure cost is uneconomical.
CN217379453U discloses a concrete trough type composite floor slab free of truss steel bars, comprising a bottom plate and truss girders, wherein the truss girders are internally provided with steel bar trusses extending longitudinally, and the lower parts of the steel bar trusses are transversely penetrated or distributed with transverse distribution steel bars, and the transverse distribution steel bars and the lower parts of the steel bar trusses are wrapped in the bottom plate. By improving the longitudinal rigidity of the composite floor slab, temporary support is not required during field installation. However, the truss girder is additionally arranged on the bottom plate of the concrete groove-type composite floor slab, the upper part of the steel bar truss is wrapped in the truss girder, the dosage of precast concrete is increased, and the problems that the rigidity and the bending strength of the composite floor slab are difficult to meet the requirements, the integral placement on the prefabricated composite floor slab is inconvenient, the posture and the position are difficult to adjust and the like are easily caused in the manufacturing and using processes of the concrete groove-type composite floor slab, the manufacturing process is complex, the cost is high, and the efficiency is low.
Disclosure of utility model
The utility model aims to overcome the defects of the prior art and provide the support-free composite floor slab, the prefabricated concrete lug is additionally arranged at the top of the prefabricated concrete beam to serve as a temporary supporting point when the concrete composite slab is installed, a temporary fixing and supporting effect is provided for the hoisting construction process of the concrete composite slab, the support is not arranged under the composite slab during construction, thus the construction measure cost is reduced, the site construction efficiency is increased, the requirements of an assembled building on the support-free and support-free floor slab can be met, in addition, the prefabricated concrete lug structure at the top of the prefabricated concrete beam is concise, the attractive indoor effect can be presented under the condition that a building suspended ceiling is not arranged, and the structural building integration is realized.
The aim of the utility model can be achieved by the following technical scheme:
The utility model aims to provide a support-free composite floor slab, which comprises a precast concrete beam, a concrete composite slab and a concrete cast-in-situ layer; the precast concrete beam comprises a precast concrete beam main body, precast concrete lugs, precast lug-picking steel bars and precast beam stirrups; the precast concrete beam main body is provided with precast concrete lugs; the precast concrete beam main body and the precast concrete lug are embedded with the precast lug reinforcing steel bars; the lower part of the precast beam stirrup is buried in the precast concrete beam main body, and the upper part extends out of the precast concrete beam main body; the concrete overlapping plate is arranged on the precast concrete beam; the concrete cast-in-situ layer is arranged on the precast concrete beam and the concrete laminated slab; the upper part of the precast beam stirrup is buried in the concrete cast-in-situ layer.
Further, the support-free composite floor slab further comprises composite slab truss ribs; the lower part of the superimposed sheet truss rib is buried in the concrete superimposed sheet, and the upper part is buried in the concrete cast-in-situ layer.
Further, the superimposed sheet truss rib is arranged perpendicular to the length direction of the precast concrete beam.
Further, a close-spliced seam is arranged between adjacent concrete superimposed sheets for on-site error adjustment.
Further, the thickness of the concrete cast-in-situ layer is not smaller than 60mm, so that the cooperative stress of the precast concrete beam, the concrete laminated slab and the concrete cast-in-situ layer is realized.
Furthermore, rough surfaces are arranged at the tops of the precast concrete beams and the concrete superimposed sheet so as to provide horizontal shearing bearing capacity for the interface between the precast and cast-in-situ layers and ensure the cooperative stress of the precast and cast-in-situ.
Further, a first rough surface is arranged at the top of the precast concrete beam so as to provide horizontal shear bearing capacity for the interface between the precast concrete beam and the concrete cast-in-situ layer.
Further, a second rough surface is arranged on the top of the concrete laminated slab so as to provide horizontal shearing bearing capacity for the interface between the concrete laminated slab and the concrete cast-in-situ layer.
Further, concrete superimposed sheets are erected on two sides of the precast concrete beam; precast concrete lugs are arranged on two sides of the top of the precast concrete beam main body; the two ends of the prefabricated lug-picking steel bar are buried in the prefabricated concrete lug, and the middle of the prefabricated lug-picking steel bar penetrates through the prefabricated concrete beam main body.
Further, a concrete superimposed sheet is erected on one side of the precast concrete beam; one side of the top of the precast concrete beam main body is provided with a precast concrete lug; one end of the prefabricated lug-picking steel bar is buried in the prefabricated concrete lug, and the other end of the prefabricated lug-picking steel bar is buried in the prefabricated concrete beam main body.
Further, the prefabricated lug reinforcing steel bars and the prefabricated beam stirrups are arranged in a staggered mode along the prefabricated concrete beam.
Further, the superimposed sheet truss rib is a reinforcing steel bar.
The size and the reinforcement of the precast concrete lug are calculated according to the span and the load of the floor slab.
The precast concrete beam and the precast concrete ear on the upper portion are processed in factories, the precast concrete beam is firstly installed in place on a construction site, then the concrete laminated slab is installed, temporary fixation is provided for the concrete laminated slab through the precast concrete ear on the precast concrete beam upper portion, the requirement of supporting-free construction site floor slabs is achieved, the requirement of template-free construction site horizontal structural members can be met through the combined form of the precast concrete beam and the concrete laminated slab, materials are saved, and construction efficiency is improved.
And after the concrete laminated slab is hoisted in place, casting a concrete cast-in-situ layer with the thickness of not less than 60mm on site, so as to realize the cooperative stress of the precast concrete beam, the precast portion of the concrete laminated slab and the cast-in-situ portion.
The precast concrete lifting lug has two functions, namely, temporary fixation is provided for the concrete laminated slab in the hoisting process of the concrete laminated slab, the hoisting construction safety is ensured, and the construction measure cost is saved; secondly, the actual stress of the floor slab structure is participated after the concrete slab is installed in place, the prefabricated concrete lug can calculate the required size and reinforcement according to the span of the floor slab, and the actual shearing resistance of the end part of the slab is increased after the cast-in-situ layer of the laminated slab concrete is solidified. The top of the precast concrete beam and the top of the concrete laminated slab are required to be provided with a rough surface, and the rough surface can provide horizontal shearing bearing capacity for the interface between the precast and cast-in-situ layers, so that the cooperative stress of the precast and cast-in-situ layers is ensured.
And the bottom reinforcing steel bar net and truss reinforcing steel bars of the concrete laminated slab, namely truss reinforcing steel bars of the laminated slab, ensure that the concrete of the concrete laminated slab is free from cracks in the whole life cycle, and calculate required reinforcing steel bars according to the span of the floor slab and the actual load.
Compared with the prior art, the utility model has the following beneficial effects:
1) According to the support-free composite floor slab, the prefabricated concrete lugs are additionally arranged at the tops of the prefabricated concrete beams and serve as temporary supporting points when the concrete composite slab is installed, temporary fixing and supporting functions are provided for the concrete composite slab in the hoisting construction process, support is not arranged below the composite slab in the construction process, so that construction measure cost is reduced, site construction efficiency is improved, the requirements of an assembled building on the support-free and support-free floor slab can be met, the prefabricated concrete lugs are additionally arranged at the tops of the prefabricated concrete beams and are integrally prefabricated in a factory, the concrete composite slab can be directly hoisted after the prefabricated concrete beams are hoisted in place, the support is not needed, the whole rigidity of the concrete is formed after the casting of the concrete is finished, the design requirement is met, a scaffold is not required to be removed, and the support-free composite floor slab is simple and quick.
2) The support-free composite floor slab has the advantages that the prefabricated concrete beam top prefabricated concrete lug is simple in structure, attractive indoor effects can be achieved under the condition that a building suspended ceiling is not arranged, and structural building integration is achieved.
3) The support-free composite floor slab is characterized in that the concrete composite slab is a unidirectional stress plate when concrete is poured, and the integral rigidity is formed after the concrete pouring is completed, so that the assumption of bidirectional stress can be satisfied, the size and reinforcement of the precast concrete lug are calculated according to the span of the floor slab, and the requirement of the large span (7 meters and more) of the floor slab can be realized.
4) The support-free composite floor slab has the advantages of simple structure, convenient production and construction, safety and reliability, capability of obviously reducing site formwork support and support workload, shortening construction period, improving construction precision and wide application range.
Drawings
Fig. 1 is a front view of a support-free composite floor slab in an embodiment of the utility model;
Fig. 2 is a schematic structural view of a precast concrete beam with precast concrete lugs on both sides of a support-free composite floor slab according to an embodiment of the present utility model;
FIG. 3 is a schematic cross-sectional view of 1-1 of FIG. 1;
FIG. 4 is a schematic cross-sectional view of FIG. 1 at 2-2;
The reference numerals in the figures indicate:
The concrete slab comprises a 1-precast concrete beam, a 2-precast concrete lug, a 3-precast lug reinforcing steel bar, a 4-precast beam stirrup, a 5-concrete laminated slab, a 6-laminated slab truss rib, a 7-concrete cast-in-situ layer and an 8-closely spliced seam.
Detailed Description
The utility model will now be described in detail with reference to the drawings and specific examples. Features such as component model, material name, connection structure and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art.
The present utility model will be described in further detail with reference to specific examples.
For simplicity of the drawing, fig. 1 to 4 schematically show only the parts relevant to the present invention, which do not represent the actual structural embodiments thereof as products.
Examples
As shown in fig. 1 to 4, the embodiment provides a support-free composite floor slab, which comprises a precast concrete beam 1, a concrete composite slab 5 and a concrete cast-in-situ layer 7; the precast concrete beam 1 comprises a precast concrete beam main body, precast concrete lugs 2, precast lug reinforcing steel bars 3 and precast beam stirrups 4; the precast concrete beam main body is provided with a precast concrete lug 2; the precast concrete beam main body and the precast concrete lug 2 are embedded with precast lug reinforcing steel bars 3; the lower part of the precast beam stirrup 4 is buried in the precast concrete beam main body, and the upper part extends out of the precast concrete beam main body; the concrete superimposed sheet 5 is erected on the precast concrete beam 1; the concrete cast-in-situ layer 7 is arranged on the precast concrete beam 1 and the concrete laminated slab 5; the upper part of the precast beam stirrup 4 is buried in the concrete cast-in-situ layer 7.
The support-free composite floor slab also comprises composite slab truss ribs 6; the lower part of the superimposed sheet truss rib 6 is buried in the concrete superimposed sheet 5, and the upper part is buried in the concrete cast-in-situ layer 7.
The superimposed sheet truss rib 6 is arranged perpendicular to the length direction of the precast concrete beam 1.
And a close splice joint 8 is reserved between the adjacent concrete superimposed sheets 5 and is used for on-site error adjustment.
The thickness of the concrete cast-in-situ layer 7 is not less than 60mm so as to realize the cooperative stress of the precast concrete beam 1, the concrete laminated slab 5 and the concrete cast-in-situ layer 7.
The top of the precast concrete beam 1 is provided with a first rough surface to provide horizontal shear bearing capacity for the interface between the precast concrete beam 1 and the concrete cast-in-situ layer 7.
The second rough surface is arranged on the top of the concrete laminated slab 5 to provide horizontal shearing bearing capacity for the interface between the concrete laminated slab 5 and the concrete cast-in-situ layer 7.
As shown in fig. 2 and 3, when the precast concrete beam 1 is a middle beam, concrete superimposed sheets 5 are erected on both sides of the precast concrete beam 1; precast concrete lugs 2 are arranged on two sides of the top of the precast concrete beam main body; the two ends of the precast concrete lug reinforcing steel bar 3 are buried in the precast concrete lug 2, and the middle part of the precast concrete lug reinforcing steel bar penetrates through the precast concrete beam main body. The cross section of the whole body of the precast concrete beam 1 and the concrete lugs 2 at the two sides is T-shaped.
As shown in fig. 4, when the precast concrete beam 1 is a side beam, a concrete composite slab 5 is erected at one side of the precast concrete beam 1; one side of the top of the precast concrete beam main body is provided with a precast concrete lug 2; one end of the precast concrete lug reinforcing steel bar 3 is buried in the precast concrete lug 2, and the other end is buried in the precast concrete beam main body. The cross section of the whole body of the precast concrete beam 1 and the concrete lug 2 at one side is in an inverted L shape.
The precast concrete is chosen ear 2 and is right trapezoid structure, with precast concrete beam main part integrated into one piece, precast concrete is chosen the upper surface of ear 2 and is parallel to the upper surface of precast concrete beam main part.
The precast lug reinforcing steel bars 3 and precast beam stirrups 4 are arranged in a staggered manner along the precast concrete beam 1.
The superimposed sheet truss rib 6 is a reinforcing bar.
The size and reinforcement of the precast concrete lug 2 are calculated according to the span and load of the floor slab.
The precast concrete beam 1 and the precast concrete ear 2 on the upper portion are processed in factories, the precast concrete beam 1 is firstly installed in place on a construction site, then the concrete superimposed sheet 5 is installed, temporary fixation is provided for the concrete superimposed sheet 5 through the precast concrete ear 2 on the precast concrete beam 1, the requirement of supporting free of a floor slab on the construction site is achieved, the requirement of a horizontal structural member on the construction site on a template is avoided due to the combined form of the precast concrete beam 1 and the concrete superimposed sheet 5, materials are saved, and the construction efficiency is improved.
After the concrete laminated slab 5 is hoisted in place, a concrete cast-in-situ layer 7 with the thickness of not less than 60mm is cast in situ, so that the cooperative stress of the precast concrete beam 1, the precast part of the concrete laminated slab 5 and the cast-in-situ part is realized.
The precast concrete picking lugs 2 have two functions, namely, temporary fixation is provided for the concrete laminated slab 5 in the hoisting process of the concrete laminated slab 5, the hoisting construction safety is ensured, and the construction measure cost is saved; secondly, the actual stress of the floor slab structure is participated after the concrete is installed in place, the prefabricated concrete lug 2 can calculate the required size and reinforcement according to the span of the floor slab, and the actual shearing resistance of the end part of the slab is increased after the cast-in-situ layer 7 of the laminated slab concrete is solidified. The tops of the precast concrete beam 1 and the concrete superimposed sheet 5 are required to be provided with rough surfaces, and the rough surfaces can provide horizontal shearing bearing capacity for the interface between the precast and cast-in-situ layers, so that the cooperative stress of the precast and cast-in-situ layers is ensured.
And the bottom reinforcing steel bar net and truss reinforcing steel bars of the concrete composite slab 5, namely truss reinforcing steel bars 6 of the composite slab, ensure that the concrete of the concrete composite slab 5 is free from cracks in the whole life cycle, and calculate required reinforcing steel bars according to the floor span and the actual load.
The construction method of the support-free composite floor slab comprises the following steps of:
Precast concrete beam 1 reserves precast concrete and chooses ear 2 at the top, and the design needs to calculate precast concrete according to floor span and upper portion load and choose ear reinforcing bar 3 and prefabricate, calculates thickness and specification and the interval of superimposed sheet truss muscle 6 of concrete superimposed sheet 5 according to the load of construction stage simultaneously. The factory processes the mould of the precast concrete beam 1 according to the design size, and binds the precast lug reinforcing steel bars 3 and precast beam stirrups 4 according to the design requirement; when the production of the components is completed, the precast concrete beam 1 is firstly hoisted and installed on the construction site, then the concrete superimposed sheet 5 is hoisted (no support is needed under the plate), the close-spliced seams 8 are reserved among the concrete superimposed sheets 5, the on-site adjustment errors are facilitated, and finally the concrete cast-in-situ layer 7 is poured and maintained.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims (10)

1. The support-free composite floor slab is characterized by comprising a precast concrete beam (1), a concrete composite slab (5) and a concrete cast-in-situ layer (7);
The precast concrete beam (1) comprises a precast concrete beam main body, precast concrete lugs (2), precast lug reinforcing steel bars (3) and precast beam stirrups (4);
the precast concrete beam main body is provided with a precast concrete lug (2);
the prefabricated lug-picking steel bars (3) are buried in the prefabricated concrete beam main body and the prefabricated concrete lug (2);
The lower part of the precast beam stirrup (4) is buried in the precast concrete beam main body, and the upper part extends out of the precast concrete beam main body;
the concrete superimposed sheet (5) is erected on the precast concrete beam (1);
The concrete cast-in-situ layer (7) is arranged on the precast concrete beam (1) and the concrete superimposed sheet (5);
The upper part of the precast beam stirrup (4) is buried in the concrete cast-in-situ layer (7).
2. A free-standing composite floor slab according to claim 1, characterized in that it further comprises composite slab truss ribs (6);
The lower part of the superimposed sheet truss rib (6) is buried in the concrete superimposed sheet (5), and the upper part is buried in the concrete cast-in-situ layer (7).
3. A support-free composite floor slab according to claim 2, characterized in that the composite truss tendons (6) are arranged perpendicular to the length direction of the precast concrete beam (1).
4. A support-free composite floor slab according to claim 1, characterized in that a tight splice joint (8) is provided between adjacent concrete composite slabs (5).
5. The support-free composite floor slab according to claim 1, wherein the thickness of the concrete cast-in-situ layer (7) is not less than 60mm, so as to realize the cooperative stress of the precast concrete beam (1), the concrete composite slab (5) and the concrete cast-in-situ layer (7).
6. A support-free composite floor slab according to claim 1, characterized in that the top of the precast concrete beam (1) is provided with a first rough surface to provide a horizontal shear bearing capacity for the interface of the precast concrete beam (1) and the concrete cast-in-situ layer (7).
7. A support-free composite floor slab according to claim 1, characterized in that the top of the concrete composite slab (5) is provided with a second rough surface to provide a horizontal shear bearing capacity for the interface of the concrete composite slab (5) and the concrete cast-in-place layer (7).
8. A support-free composite floor slab according to claim 1, characterized in that the precast concrete beams (1) are provided with concrete composite slabs (5) on both sides;
Precast concrete lugs (2) are arranged on two sides of the top of the precast concrete beam main body;
The two ends of the prefabricated lug-picking steel bar (3) are buried in the prefabricated concrete lug (2), and the middle part of the prefabricated lug-picking steel bar penetrates through the prefabricated concrete beam main body.
9. A support-free composite floor slab according to claim 1, characterized in that a concrete composite slab (5) is erected on one side of the precast concrete beam (1);
One side of the top of the precast concrete beam main body is provided with a precast concrete lug (2);
One end of the precast concrete lug reinforcing steel bar (3) is buried in the precast concrete lug (2), and the other end of the precast concrete lug reinforcing steel bar is buried in the precast concrete beam main body.
10. A support-free composite floor slab according to claim 1, characterized in that the prefabricated lug reinforcing bars (3) and the prefabricated beam stirrups (4) are staggered along the prefabricated concrete beam (1).
CN202322497038.1U 2023-09-14 2023-09-14 Support-free composite floor slab Active CN220928370U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202322497038.1U CN220928370U (en) 2023-09-14 2023-09-14 Support-free composite floor slab

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202322497038.1U CN220928370U (en) 2023-09-14 2023-09-14 Support-free composite floor slab

Publications (1)

Publication Number Publication Date
CN220928370U true CN220928370U (en) 2024-05-10

Family

ID=90966136

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202322497038.1U Active CN220928370U (en) 2023-09-14 2023-09-14 Support-free composite floor slab

Country Status (1)

Country Link
CN (1) CN220928370U (en)

Similar Documents

Publication Publication Date Title
CN106836479B (en) Assembled prestressed concrete frame structure
CN109025017A (en) Reinforced concrete hollow overlaps two-way ribbed slab floor and its method of construction
CN108301545A (en) A kind of big module overlapping contignation of the assembled with space truss temporary support
CN214696113U (en) Connection structure of assembled prefabricated floor and composite beam
CN111576619A (en) Production method of high-strength concrete post-cast assembled frame system
CN106760108A (en) A kind of prefabricated overlapping board connecting equipment
CN113006346A (en) Novel integral shear wall structure of prefabricated assembly
CN111705987A (en) Large-span prefabricated ribbed prestressed hollow bidirectional laminated slab
CN209011399U (en) Reinforced concrete hollow overlaps two-way ribbed slab floor
CN110644662A (en) Prefabricated flat slab composite slab based on stress and splitting method thereof
CN212656384U (en) High-strength concrete connecting piece, high-strength concrete post-cast assembled frame system and support frame
DK177889B1 (en) System and Method for biaxial semi-prefabricated lightweight concrete slab
CN108301546A (en) A kind of big module overlapping contignation of the assembled with plane girder temporary support
CN220928370U (en) Support-free composite floor slab
CN218345930U (en) Bridge structure
CN112900949B (en) Assembled reinforced concrete unidirectional multi-ribbed laminated slab floor and construction method thereof
CN215716414U (en) One-way close rib composite floor
CN112282164B (en) Light composite floor slab structure and construction method thereof
CN212388355U (en) Bridge deck structure of steel truss bridge
CN212926589U (en) Assembly type formwork-dismantling-free structural body formwork and cast-in-place formwork-dismantling-free structural body
CN211548061U (en) Laminated arch shell structure
CN111101617A (en) Combined anti-cracking structure of filler wall and construction method
CN217175198U (en) Connecting structure of steel bar truss floor bearing plate and reinforced concrete wall
CN110886392A (en) Laminated arch shell structure and construction method thereof
CN211817282U (en) Close piece together unidirectional superimposed sheet of notch cuttype PC prestressing force

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant