CN117926905A - Prestressed component of internal and external thread connecting hole, connecting structure and application method - Google Patents
Prestressed component of internal and external thread connecting hole, connecting structure and application method Download PDFInfo
- Publication number
- CN117926905A CN117926905A CN202410031010.5A CN202410031010A CN117926905A CN 117926905 A CN117926905 A CN 117926905A CN 202410031010 A CN202410031010 A CN 202410031010A CN 117926905 A CN117926905 A CN 117926905A
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- Prior art keywords
- piece
- sleeve
- connection
- butt joint
- hole
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 210000001503 joint Anatomy 0.000 claims abstract description 37
- 210000002435 tendon Anatomy 0.000 claims abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/023—Separate connecting devices for prefabricated floor-slabs
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a prestress component of an internal and external thread connecting hole, a connecting structure and an application method, wherein the prestress component comprises a component body; the connecting end face of the component body is abutted with a sleeve, threads are processed inside and outside the sleeve, and a conical hole is formed in an inner hole of one end of the sleeve, which faces the connecting end face; the member body is internally fixed with a prestressed rib, two ends of the prestressed rib penetrate out of corresponding sleeves, the ends of the prestressed rib are tightly propped against the inner wall of the conical hole through wedge-shaped anchor sheets, and the sleeves are tightly pressed on the connecting end face. The connecting structure adopts a hollow connecting piece, a butt joint piece and a locking piece to realize the connection of two component bodies; the hollow connecting piece is a bolt connected with the internal thread of the sleeve, and the end head of the bolt is provided with an avoidance hole for avoiding the prestressed tendon; the butt joint piece is a butt joint rod body propped between two corresponding bolts, and the locking piece locks the end head of the butt joint rod body on the external thread of the sleeve. The application method comprises the following steps: the gaps formed at the joints of the hollow connecting piece, the butt joint piece and the locking piece are filled with concrete.
Description
Technical Field
The invention relates to the technical field of assembly type constructional engineering, in particular to a prestress component of an internal and external thread connecting hole, a connecting structure and an application method.
Background
The prior vertical prefabricated component wallboard/column of the assembled building is connected by grouting and anchoring the reinforcing steel bar sleeve, namely, the upper connecting reinforcing steel bar of the prefabricated wallboard/column is inserted into the embedded sleeve at the lower part of the prefabricated wallboard/column, and the wallboard needs to be supported; then high-strength grouting material is poured into the sleeve through the grouting holes, so that the efficiency is low and the cost is high; the reinforcing steel bars and the sleeve are connected in an anchoring manner through the coagulation of grouting materials, the grouting materials are leaked, blocked, misaligned and safe, the joint seam at the connecting part of the members is prone to rain leakage and water seepage, the factors affecting the connecting quality are multiple, the quality controllability is poor, the anti-seismic safety is reduced, and the technical problem is to be solved.
The structural connection of the prior prefabricated floor slab of the assembled building adopts a superimposed sheet mode, namely, the prefabricated floor slab is formed by twice pouring, namely: the bottom of the floor slab is prefabricated into the thickness of about 6 cm, and then the floor slab formed by binding reinforcing steel bars and integrally pouring upper concrete is called a laminated slab.
The laminated slab cannot be stressed due to the thin thickness, and the laminated slab is easily cracked due to the influence of bumpy external force in the transportation process; before installation, a supporting frame and a template are required to be integrally erected to prevent stress cracking; the secondary reinforcement and the secondary integral casting concrete operation are required to form an integral structure, and the integral casting concrete operation cannot be used for continuous installation and construction, so that the efficiency is low and the cost is high.
The mode of secondary pouring and forming of the laminated slab needs to compensate the loss of load force reduction by increasing the thickness of the slab, so that the problems of more materials, heavy weight and high cost (thickness/materials/dead weight/cost increased by about 30% compared with the slab formed by primary pouring) are caused, the quality of the hollowing and cracking of the bonding layer is uncontrollable, and the shock resistance is reduced, and the technical problem is to be solved. The method for installing the laminated slab is adopted, and because the space between the two floor slab ends is limited, the mode of grouting connection of the reinforcing steel bar sleeve cannot be used, the problem of structural connection integrity is solved by adopting the mode of secondary binding of the laminated slab and pouring of reinforced concrete.
Thus, the prefabricated components of the existing fabricated building are solved, and vertical components (wallboards/columns) are connected: mass common problems such as slurry leakage, clamping stagnation, unstable and uncontrollable mass and the like; the installation efficiency is low, the cost is high, the construction is hidden, the quality inspection is inconvenient, the shock resistance is low, and the like; horizontal component (floor slab) superimposed sheet exists: the method has the advantages of low efficiency, high cost, large dead weight, low load, easy empty drum cracking, poor shock resistance and other common quality problems when in on-site concrete pouring operation.
Moreover, for the prestress component, the steel pipe structure is combined with the prestress rib to form the prestress steel pipe structure, and the prestress steel pipe structure is a component with strong structural strength and self-resetting capability, but in the assembled structure, the prestress rib is difficult to prefabricate and process in a factory, stretching is required on site, and the technical limitation makes the on-site construction component difficult to achieve strong structural strength. In addition, for building construction, the continuity of the prestressed tendons, namely the prestressed tendons between the steel pipes (column and column, beam and beam, column and beam) also need to have a certain association relationship, so that the overall structure stability effect is stronger, and the steel pipe structure in the prior art is exposed in a lot of spaces worth improving.
In addition, after the prestress rib and the steel pipe are combined to form an assembled structure, how to carry out assembly connection on site, how to reasonably avoid connection points on the structure and form a coherent connection structure are all problems to be considered in practical application.
Therefore, how to provide a prestress member, a connection structure and an application method capable of overcoming the defects of the existing fabricated steel pipe and meeting the connection strength is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a prestress member for an internal and external threaded connecting hole, a connecting structure and an application method thereof, and aims to solve the above technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a prestress component of an internal and external thread connecting hole comprises a component body; the connecting end face of the component body is abutted with a sleeve, threads are machined inside and outside the sleeve, and a conical hole is formed in an inner hole of one end of the sleeve, which faces the connecting end face; the member body is internally fixed with a prestressed tendon, two ends of the prestressed tendon penetrate out of the corresponding sleeve, the end head of the prestressed tendon is tightly propped against the inner wall of the conical hole through a wedge-shaped anchor sheet, and the sleeve is tightly pressed on the connecting end face.
Preferably, in the prestress member with the internal and external screw connection holes, the member body is a concrete floor slab or a grid floor slab.
Preferably, in the prestress member of the internal and external thread connecting hole, the prestress ribs are arranged in a straight line or in a curve.
Preferably, in the prestress member of the internal and external thread connecting hole, the connecting end face of the member body is provided with a U-shaped rib.
The invention also discloses a connecting structure of the prestress component of the internal and external thread connecting hole, which adopts a hollow connecting piece, a butt joint piece and a locking piece to realize the connection of the two component bodies; the hollow connecting piece is a bolt connected with the internal thread of the sleeve, and the end head of the bolt is provided with an avoidance hole for avoiding the prestressed tendon; the butt joint piece is a butt joint rod body propped between two corresponding bolts, and the locking piece locks the end head of the butt joint rod body on the external thread of the sleeve.
Preferably, in the connection structure of the prestress member of the internal and external thread connection hole, two ends of the butt joint rod body are provided with expansion heads; the locking piece comprises two internal thread sleeves sleeved on the butt joint rod body, the internal thread sleeves are connected with external threads of the sleeves, the expansion head is abutted against the bolt in a propping mode, and the expansion head is matched with the internal thread sleeves through wedge-shaped end faces.
Preferably, in the connection structure of the prestress member of the internal and external screw connection hole, the enlarged head is connected with the end of the butt joint rod body through screw threads.
Preferably, in the connection structure of the prestress member with the internal and external threaded connection holes, an adjusting head is connected to one end of the enlarged head, which is opposite to the butt joint rod body, through threads, and the adjusting head is abutted against the bolt in a propping manner.
Preferably, in the connection structure of the prestress member of the internal and external thread connection hole, the middle part of the butt joint rod body is disconnected and connected through the internal thread connection sleeve.
The invention also provides an application method of the connecting structure of the prestress component of the internal and external thread connecting hole, and the component body is used as a floor slab and/or a wallboard to realize the connection assembly among the hollow connecting piece, the butt joint piece and the locking piece.
Preferably, in the application method of the connection structure of the prestress member of the internal and external thread connection hole, gaps formed at the connection positions of the hollow connecting piece, the butt joint piece and the locking piece are filled with concrete.
Preferably, in the application method of the connection structure of the prestress member of the internal and external thread connection hole, the length of the butt joint rod body is controlled to achieve the crossing avoidance among the hollow connecting piece, the butt joint piece and the locking piece.
Compared with the prior art, the invention discloses the prestress component of the internal and external thread connecting hole, the connecting structure and the application method, which can realize the connection between steel structures, and meanwhile, the avoidance of the prestress rib end can be realized by arranging the avoidance hole, so that the problem of prefabrication connection of the prestress rib and the steel pipe in a factory in the prior art is overcome, and the structural strength and construction requirement of an assembled structure are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the structure of a member body with linear tendons according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a member body with curved tendons according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the connection structure of the prestress member of the internal and external screw connection hole of embodiment 2 provided by the present invention;
FIG. 4 is a schematic view showing the connection structure of the prestressed member of the internal and external screw connection holes using the female screw connection sleeve according to embodiment 2 of the present invention;
FIG. 5 is a schematic view showing the connection structure of the prestress member using the internal and external screw connection holes of the adjusting head according to embodiment 2;
FIG. 6 is a schematic view showing the structure of the first connecting structure of the prestress member of the internal and external screw connecting hole of embodiment 2;
FIG. 7 is a schematic view showing a second connection structure of the prestressed member of the internal and external screw connection hole of embodiment 2 according to the present invention;
FIG. 8 is a schematic view showing the structure of a third connecting structure of the prestress member of the internal and external screw connecting hole of embodiment 2;
fig. 9 is a schematic structural view showing a fourth connection structure of the prestress member of the internal and external screw connection hole of embodiment 2.
Wherein:
1-a component body; 2-a sleeve; 3-prestress ribs; 4-U-shaped ribs; 5-hollow connectors; 6-butt joint piece; 7-locking piece; 8-adjusting the head; 9-an internal thread connecting sleeve; 10-concrete.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 2, the embodiment of the invention discloses a prestress member of an internal and external threaded connecting hole, which comprises a member body 1; the connecting end face of the component body 1 is abutted with a sleeve 2, threads are processed inside and outside the sleeve 2, and a conical hole is formed in an inner hole of one end of the sleeve 2 facing the connecting end face; the inside prestressing tendons 3 that is fixed with of component body 1, prestressing tendons 3 both ends wear out corresponding sleeve pipe 2, prestressing tendons 3 end is tightly held up on the inner wall of bell mouth through wedge anchor sheet to compress tightly sleeve pipe 2 on the connection terminal surface.
In order to further optimize the technical scheme, the component body 1 is a concrete floor slab or a grid floor slab.
In order to further optimize the technical scheme, the prestressing tendons 3 are arranged in a straight line or in a curve.
In order to further optimize the technical scheme, the connecting end face of the component body 1 is provided with a U-shaped rib 4.
Example 2:
referring to fig. 3 to 9, the embodiment of the invention discloses a connection structure of a prestress member of an internal and external thread connection hole, and on the basis of embodiment 1, a hollow connecting piece 5, a butt joint piece 6 and a locking piece 7 are adopted to realize connection of two member bodies 1; the hollow connecting piece 5 is a bolt connected with the internal thread of the sleeve 2, and the end head of the bolt is provided with an avoidance hole for avoiding the prestressed tendon 3; the butt joint part 6 is a butt joint rod body propped between two corresponding bolts, and the locking part 7 locks the end head of the butt joint rod body on the external thread of the sleeve 2.
In order to further optimize the technical scheme, the two ends of the butt joint rod body are provided with enlarged heads; the locking piece 7 comprises two internal thread sleeves sleeved on the butt joint rod body, the internal thread sleeves are connected with external threads of the sleeve 2, the expansion head is abutted against the bolt in a propping mode, and the expansion head is matched with the internal thread sleeves through wedge-shaped end faces.
In order to further optimize the technical scheme, the enlarged footing is connected with the end of the butt joint rod body through threads.
In order to further optimize the technical scheme, one end of the expansion head, which is opposite to the butt joint rod body, is connected with an adjusting head 8 through threads, and the adjusting head 8 is tightly abutted with the bolt in a propping mode.
In order to further optimize the technical scheme, the middle part of the butt joint rod body is disconnected and connected through the internal thread connecting sleeve 9.
As shown in fig. 6 to 9, the present embodiment discloses a connection structure of the prestressed component of the internal and external threaded connection hole in four forms, and based on this as a structural principle, various connection structure forms can be further evolved, and the description thereof will not be repeated here.
Example 3:
The embodiment of the invention discloses an application method of a connecting structure of a prestress component of an internal and external thread connecting hole, wherein a component body 1 is used as a floor slab and/or a wallboard, and the components are connected and assembled through a hollow connecting piece 5, a butt joint piece 6 and a locking piece 7.
In order to further optimise the above technical solution, the gap formed at the connection of the hollow connecting piece 5, the butt piece 6 and the locking piece 7 is filled with concrete 10.
In order to further optimize the technical scheme, the length of the butt joint rod body is controlled to realize the cross avoidance among the hollow connecting piece 5, the butt joint piece 6 and the locking piece 7.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A prestress component of an internal and external thread connecting hole, which is characterized by comprising a component body (1); a sleeve (2) is abutted on the connecting end surface of the member body (1), threads are machined inside and outside the sleeve (2), and a conical hole is formed in an inner hole at one end of the sleeve (2) facing the connecting end surface; the novel connecting structure is characterized in that a prestress rib (3) is fixed inside the member body (1), two ends of the prestress rib (3) penetrate out of the corresponding sleeve (2), the end head of the prestress rib (3) is tightly propped against the inner wall of the conical hole through a wedge-shaped anchor sheet, and the sleeve (2) is tightly pressed on the connecting end face.
2. A pre-stressing element of an internally and externally threaded connection according to claim 1, characterized in that said element body (1) is a concrete floor or a grid floor.
3. A pre-stressing element of an internally and externally threaded connection according to claim 1, characterized in that said pre-stressing tendons (3) are arranged in a straight line or in a curved line.
4. A pre-stressing element of an internally and externally threaded connection according to claim 1, characterized in that said element body (1) has U-shaped ribs (4) on the connection end face.
5. A connection structure of prestressed components using the internal and external screw connection holes according to any one of claims 1-4, characterized in that the connection of two said component bodies (1) is achieved using a hollow connection piece (5), a butt piece (6) and a locking piece (7); the hollow connecting piece (5) is a bolt connected with the internal thread of the sleeve (2), and the end head of the bolt is provided with an avoidance hole for avoiding the prestressed tendon (3); the butt joint piece (6) is a butt joint rod body propped between two corresponding bolts, and the locking piece (7) locks the end head of the butt joint rod body on the external thread of the sleeve (2).
6. The pre-stressing member for an internally and externally threaded connection according to claim 5, characterized in that said abutment bar has enlarged heads at both ends; the locking piece (7) comprises two inner threaded sleeves sleeved on the butt joint rod body, the inner threaded sleeves are connected with the outer threads of the sleeves (2), the expansion head is tightly abutted to the bolt in a propping mode, and the expansion head is matched with the inner threaded sleeves through wedge-shaped end faces.
7. The pre-stressing member for an internally and externally threaded coupling hole according to claim 6, characterized in that said enlarged head is threadedly coupled to the end of said abutment rod.
8. The prestress member of an internally and externally threaded connecting hole according to claim 7, wherein an adjusting head (8) is connected to an end of the enlarged head facing away from the butt joint rod body through threads, and the adjusting head (8) is abutted against the bolt.
9. A pre-stressing element of an internally and externally threaded connection according to claim 6, characterized in that the butt-joint rod body is split in its middle and connected by means of an internally threaded connection sleeve (9).
10. A method of application of a connection structure of a pre-stressed element of a threaded connection hole, according to any one of claims 5-7, characterized in that the element body (1) is assembled as a floor and/or wall panel by means of the connection of the hollow connection piece (5), the abutment piece (6) and the locking piece (7) to each other.
11. The method of application of the connection structure of the pre-stressed members with externally threaded connection holes according to claim 11, characterized in that the gap formed at the connection of the hollow connection piece (5), the butt piece (6) and the locking piece (7) is filled with concrete (10).
12. The method for applying the connection structure of the pre-stressed member with the externally threaded connection hole according to claim 11, wherein the cross avoidance among the hollow connecting piece (5), the abutting piece (6) and the locking piece (7) is achieved by controlling the length of the abutting rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410031010.5A CN117926905A (en) | 2024-01-09 | 2024-01-09 | Prestressed component of internal and external thread connecting hole, connecting structure and application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410031010.5A CN117926905A (en) | 2024-01-09 | 2024-01-09 | Prestressed component of internal and external thread connecting hole, connecting structure and application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117926905A true CN117926905A (en) | 2024-04-26 |
Family
ID=90755148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410031010.5A Pending CN117926905A (en) | 2024-01-09 | 2024-01-09 | Prestressed component of internal and external thread connecting hole, connecting structure and application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117926905A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761462A (en) * | 2019-10-24 | 2020-02-07 | 重庆大学 | Prefabricated floor slab connecting system and construction method thereof |
-
2024
- 2024-01-09 CN CN202410031010.5A patent/CN117926905A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761462A (en) * | 2019-10-24 | 2020-02-07 | 重庆大学 | Prefabricated floor slab connecting system and construction method thereof |
| CN110761462B (en) * | 2019-10-24 | 2025-04-15 | 重庆大学 | A prefabricated floor slab connection system and construction method thereof |
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