Fiber grid reinforced cast-in-place reinforced concrete shear wall and construction technology

Abstract

The invention relates to a fiber grid reinforced cast-in-place reinforced concrete shear wall and a construction process. The fiber grid reinforced cast-in-place reinforced concrete shear wall comprises concrete, horizontally-distributed steel bars and vertically-distributed steel bars, and fiber grid cloth is poured on the left side and the right side of the concrete. The threaded rods with the iron plate nuts are connected to the intersection points of the horizontally-distributed steel bars and the vertically-distributed steel bars, and the connecting pieces distributed in the shape like the Chinese character'jing 'are arranged on the outer surfaces of the iron plate nuts, so that before concrete is poured, the fiber gridding cloth is fixed to the preset position, and it is guaranteed that in the concrete pouring and vibrating process, the fiber gridding cloth is not prone to falling off. And the position of the fiber gridding cloth is not changed, and finally the fiber gridding cloth and the reinforced concrete wall form a whole to jointly resist external loads. Besides, the screws with the iron plate nuts can work cooperatively with the high-strength screws penetrating through the formworks, it can be guaranteed that the distance between the formworks on the two sides of the shear wall body and the distance between the formworks and the outer surfaces of steel bars meet the design requirement, and it can be guaranteed that formwork expansion does not occur during concrete pouring and vibrating.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber-reinforced reinforced concrete structure engineering, and specifically relates to a fiber grid-reinforced cast-in-place reinforced concrete shear wall and a construction process. Background Art

[0002] Reinforced concrete structure is the most widely used structural form in my country's engineering structures. Cast-in-place reinforced concrete shear walls are the most important load-bearing components in reinforced concrete structures, and usually need to bear the vertical and horizontal loads of the structure. Due to the low tensile strength of ordinary concrete and large shrinkage deformation during drying, reinforced concrete structures often have cracks of varying degrees and forms during construction and use. This is a fairly common phenomenon. Cracks in reinforced concrete shear walls not only affect the appearance of structural components, but also easily lead to long-term leakage of the exterior walls of the basement of the engineering structure, rainwater leakage of the exterior walls of the building structure above ground, etc., which can easily lead to corrosion of steel bars and reduce the durability of the structure. In addition, the existence of cracks in reinforced concrete shear walls not only affects the visual quality, but may also cause people to worry about the quality of the project and even trigger social public opinion.

[0003] At present, fiber concrete is prepared by adding fibers with high tensile strength, high ultimate elongation and good alkali resistance to concrete, such as steel fiber concrete, glass fiber concrete, polypropylene fiber concrete and carbon fiber concrete, which can effectively improve the crack resistance and durability of concrete structures. However, fiber concrete is very expensive, and its cost performance is very low for improving the crack resistance and durability of concrete. Therefore, how to take effective measures to prevent harmful cracks in concrete structures and improve the impermeability and durability of concrete structures has always been a common and important problem that needs to be solved in the construction and operation and maintenance of concrete structures. Summary of the invention

[0004] The purpose of the present invention is to provide a fiber grid reinforced cast-in-place reinforced concrete shear wall to solve the technical problems in the prior art that ordinary reinforced concrete is easy to crack, easy to leak, and has low durability, and fiber concrete is expensive and has a low cost performance.

[0005] The second object of the present invention is to provide a construction process for a fiber grid reinforced cast-in-place reinforced concrete shear wall.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A fiber grid reinforced cast-in-place reinforced concrete shear wall comprises concrete, horizontal distribution steel bars and vertical distribution steel bars, and fiber grid cloth is cast on the left and right sides of the concrete.

[0008] Furthermore, the fiber material of the fiber mesh cloth is carbon fiber, glass fiber or basalt fiber, and the mesh size of the fiber mesh cloth is 8mm×8mm-10cm×10cm.

[0009] Furthermore, a plurality of screw rods are cast in the concrete, the screw rods extend in the left-right direction, the left and right ends of the screw rods are connected with nuts, the fiber mesh cloth is connected to the nuts, and the screw rods are connected to the intersection of the horizontal distribution steel bars and the vertical distribution steel bars.

[0010] Furthermore, the plurality of screws are distributed in a rectangular shape, and the distance between two laterally adjacent screws or two vertically adjacent screws is between 200 mm and 600 mm.

[0011] Furthermore, the nut is an iron plate nut, and a strip-shaped connecting piece is connected to the end of the nut opposite to the center of the screw. There are several connecting pieces, and the connecting pieces are arranged in a tic-tac-toe shape. The connecting piece is located between the fiber mesh cloth and the nut.

[0012] Furthermore, the width of the connecting piece is 2 cm-4 cm, and the total area of ​​the connecting piece located on each side of the concrete is ≥ 5% of the area of ​​the fiber mesh cloth.

[0013] Furthermore, the connecting piece is arranged at the edge of the fiber mesh cloth.

[0014] Furthermore, the screw is a full-thread screw, a coarse-thread screw or a T-type screw; the diameter of the screw is 6 mm-20 mm, and the diameter of the screw is ≤ the size of the mesh of the fiber mesh cloth.

[0015] A construction process for a fiber grid reinforced cast-in-place reinforced concrete shear wall comprises the following steps:

[0016] S1: Screw nuts on both ends of the screw rod, tie the horizontal distribution steel bars and the vertical distribution steel bars, fix the screw rod at the intersection of the horizontal distribution steel bars and the vertical distribution steel bars, and extend the screw rod in the left and right directions;

[0017] S2: Arrange the connecting pieces vertically and horizontally and fix them on the outside of the nuts, straighten the fiber mesh cloth and lay it on the outside of the connecting pieces and stick it firmly, cut off the excess fiber mesh cloth, and the edges of the fiber mesh cloth are all provided with the connecting pieces;

[0018] S3: Set up formwork outside the fiber mesh cloth, fix the formwork with high-strength screws, pour concrete, and remove the formwork after maintenance.

[0019] Furthermore, the high-strength screw is located between the meshes of the fiber mesh cloth, and the performance of the high-strength screw is not less than grade 8.8, and the yield strength is not less than 640 MPa.

[0020] Beneficial effects of the present invention:

[0021] The fiber grid reinforced cast-in-place reinforced concrete shear wall prepared by the present invention has excellent crack resistance, lateral bending stiffness and bending bearing capacity, reduces the problems of cracking and leakage of traditional shear walls, and increases the durability of traditional shear walls.

[0022] The working principle of the present invention is as follows: by connecting a screw with an iron plate nut at the intersection of the horizontally distributed steel bars and the vertically distributed steel bars, and setting a connecting piece arranged in a tic-tac-toe pattern on the outer surface of the iron plate nut, the fiber mesh cloth is fixed at a predetermined position before pouring concrete, and the position of the fiber mesh cloth is ensured not to change during the pouring and vibration of the concrete, and finally it is integrated with the reinforced concrete wall to jointly resist the external load. In addition, the screw with the iron plate nut can also work in conjunction with the high-strength screw that passes through the formwork, which can not only ensure that the distance between the formworks on both sides of the shear wall and the distance between the formworks and the outer surface of the steel bars meet the design requirements, but also ensure that the formwork does not expand during the pouring and vibration of the concrete.

[0023] The fiber mesh cloth arranged on both sides of the cast-in-place reinforced concrete shear wall of the present invention can bear stress simultaneously with the steel bars and bear external lateral horizontal loads together. When the fiber mesh reinforced cast-in-place reinforced concrete shear wall of the present invention is subjected to horizontal loads perpendicular to the wall surface, since the fiber mesh cloth is cast in-place with the concrete, the fiber mesh cloth arranged on both sides of the reinforced concrete shear wall can bear stress simultaneously with the steel bars and bear external lateral horizontal loads together. Under the same lateral horizontal load, the fiber mesh reinforced cast-in-place reinforced concrete shear wall of the present invention has smaller lateral deformation than ordinary shear walls of the same size, the same reinforcement and the same concrete strength, so that the horizontal bending stiffness and bending bearing capacity of the reinforced concrete shear wall can be improved, and the cracks of the reinforced concrete shear wall can be reduced, and the crack resistance of the concrete shear wall can be enhanced. In addition, since the fiber mesh cloth of the present invention is arranged on both sides of the reinforced concrete shear wall, the fiber mesh cloth can limit the shrinkage deformation and temperature deformation of the concrete, so that the shrinkage cracks and temperature cracks on the concrete surface can be reduced. With the improvement of the crack resistance of reinforced concrete shear walls, the problems of cracking and leakage of shear wall concrete and the resulting steel bar corrosion will be effectively alleviated, and the durability of reinforced concrete shear walls will be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional schematic diagram of the fiber grid reinforced cast-in-place reinforced concrete shear wall in Example 1;

[0025] Figure 2 for Figure 1 BB cross-sectional diagram;

[0026] Figure 3 for Figure 1 AA cross-sectional diagram of ;

[0027] Figure 4 Schematic diagram of the structure of the screw in Example 1.

[0028] In the figure: 1. Fiber mesh cloth; 2. Connecting plate; 3. Nut; 4. Screw; 5. High-strength screw; 6. Horizontal distribution steel bars; 7. Vertical distribution steel bars; 8. Formwork; 9. Square timber; 10. Concrete; 11. Steel pad; 12. Compression beam. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] Example 1

[0031] The fiber mesh reinforced cast-in-place reinforced concrete shear wall of Example 1 includes concrete 10, horizontally distributed steel bars 6 and vertically distributed steel bars 7 on the left and right sides, and fiber mesh cloth 1 is cast on both sides of the concrete 10. The fiber mesh cloth 1 is carbon fiber, and the mesh size of the fiber mesh cloth 1 is 8mm×8mm. Several screws 4 are also cast inside the concrete 10. The screws 4 are full-thread screws. The screws 4 extend in the left and right directions. The left and right ends of the screws 4 are threadedly connected with nuts 3, and the nuts 3 are iron plate nuts 3. Several screws 4 are distributed along a rectangle, and the screws 4 are connected to the intersection of the horizontally distributed steel bars 6 and the vertically distributed steel bars 7. The end of the nut 3 away from the center of the screw 4 is connected with a strip-shaped connecting piece 2, and the connecting piece 2 is an iron sheet. There are several connecting pieces 2, and several connecting pieces 2 are distributed in a well shape. The connecting pieces 2 distributed in the horizontal direction connect the nuts 3 in the same row, and the connecting pieces 2 distributed in the vertical direction connect the nuts 3 in the same column. The fiber mesh cloth 1 is connected to the outer side of the connecting piece 2, and the connecting pieces 2 distributed horizontally and the connecting pieces 2 distributed vertically are arranged to the edge of the fiber mesh cloth 1. The width of the connecting piece 2 is 2 cm, and the total area of ​​the connecting piece 2 is 5% of the total area of ​​the fiber mesh cloth 1. The distance between two adjacent screw rods 4 in the horizontal direction is 300 mm, and the distance between two adjacent screw rods 4 in the vertical direction is 300 mm. The diameter of the screw rod 4 is 6 mm.

[0032] The construction process of the fiber grid reinforced cast-in-place reinforced concrete 10 shear wall of Example 1 comprises the following steps:

[0033] S1: Screw two nuts 3 at both ends of the screw rod 4, and the screw rod 4 does not extend out of the outer surface of the nut 3; tie the horizontal distribution steel bars 6 and the vertical distribution steel bars 7, and tie the screw rod 4 at the intersection of the horizontal distribution steel bars 6 and the vertical distribution steel bars 7;

[0034] S2: Fix the connecting pieces 2 distributed in the transverse direction and the connecting pieces 2 distributed in the vertical direction at the end of the nut 3 away from the center of the screw rod 4, straighten the fiber mesh cloth 1 and stick it to the outside of the connecting piece 2, and cut off the excess fiber mesh cloth 1;

[0035] S3: A formwork 8 is supported outside the fiber mesh cloth 1, and the formwork 8 is fixed with a high-strength screw 5, and then concrete 10 is poured, cured, and the formwork is removed to obtain a fiber mesh reinforced cast-in-place reinforced concrete shear wall. The two ends of the high-strength screw 5 are located in the mesh holes of the fiber mesh cloth 1 on both sides to avoid damaging the fiber bundles of the fiber mesh cloth 1.

[0036] The outer side of the template 8 is fixed by square wood 9, and a pressure beam 12 is arranged on the outer side of the square wood. The left and right ends of the high-strength screw 5 pass through the pressure beam 12. The left and right ends of the high-strength screw 5 are threadedly connected with steel pads 11. The steel pads 11 are located on the outer side of the pressure beam and are tightly attached to the pressure beam.

[0037] The thickness of the steel bar protective layer = the distance between the intersection of the single-sided horizontal distribution steel bars, vertical distribution steel bars and screw and the outer surface of the nut + the thickness of the single-sided connecting plate + the thickness of the single-sided fiber mesh cloth.

[0038] The thickness of the 3D mesh reinforced cast-in-place reinforced concrete shear wall = the thickness of the fiber mesh cloth on both sides + the thickness of the connecting plates on both sides + the distance between the outer surfaces of the two nuts.

Claims

1. A fiber grid reinforced cast-in-place reinforced concrete shear wall, comprising concrete, horizontal distribution steel bars and vertical distribution steel bars, characterized in that: Fiber mesh cloth is poured on the left and right sides of the concrete.

2. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 1, characterized in that: The fiber material of the fiber mesh cloth is carbon fiber, glass fiber or basalt fiber, and the mesh size of the fiber mesh cloth is 8mm×8mm-10cm×10cm.

3. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 2, characterized in that: A plurality of screw rods are cast in the concrete, the screw rods extend in the left-right direction, the left and right ends of the screw rods are connected with nuts, the fiber mesh cloth is connected to the nuts, and the screw rods are connected to the intersection of the horizontal distribution steel bars and the vertical distribution steel bars.

4. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 3, characterized in that: The plurality of screws are distributed in a rectangular shape, and the distance between two laterally adjacent screws or two vertically adjacent screws is between 200 mm and 600 mm.

5. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 3, characterized in that: The nut is an iron plate nut, and a strip-shaped connecting piece is connected to the end of the nut opposite to the center of the screw rod. There are a plurality of connecting pieces, which are arranged in a tic-tac-toe shape, and the connecting piece is located between the fiber mesh cloth and the nut.

6. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 5, characterized in that: The width of the connecting piece is 2 cm-4 cm, and the total area of ​​the connecting piece located on each side of the concrete is ≥ 5% of the area of ​​the fiber mesh cloth.

7. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 5, characterized in that: The connecting piece is arranged at the edge of the fiber mesh cloth.

8. The fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 3, characterized in that: The screw is a full-thread screw, a coarse-thread screw or a T-type screw; the diameter of the screw is 6 mm-20 mm, and the diameter of the screw is ≤ the size of the mesh of the fiber mesh cloth.

9. A construction process for a fiber mesh reinforced cast-in-place reinforced concrete shear wall as claimed in claim 1, characterized in that: The following steps are involved: S1: Screw nuts on both ends of the screw rod, tie the horizontal distribution steel bars and the vertical distribution steel bars, fix the screw rod at the intersection of the horizontal distribution steel bars and the vertical distribution steel bars, and extend the screw rod in the left and right directions; S2: Arrange the connecting pieces vertically and horizontally and fix them on the outside of the nuts, straighten the fiber mesh cloth and lay it on the outside of the connecting pieces and stick it firmly, cut off the excess fiber mesh cloth, and the edges of the fiber mesh cloth are all provided with the connecting pieces; S3: Set up formwork outside the fiber mesh cloth, fix the formwork with high-strength screws, pour concrete, and remove the formwork after maintenance.

10. The construction process of fiber grid reinforced cast-in-place reinforced concrete shear wall according to claim 9, characterized in that: The high-strength screw is located between the meshes of the fiber mesh cloth, the performance of the high-strength screw is not less than grade 8.8, and the yield strength is not less than 640 MPa.

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