Local grooving, replacing and reinforcing method for concrete shear wall

Abstract

The invention relates to the technical field of building construction, in particular to a concrete shear wall local slotting replacement reinforcing method which comprises the steps that a plurality of vertical reinforcing grooves distributed at intervals in the horizontal direction are dug in the wall face of one side of a target shear wall of a target floor; a plurality of vertical reinforcing ribs are placed in each vertical reinforcing groove, a plurality of U-shaped steel bars are placed in each vertical reinforcing groove, the U-shaped steel bars are welded to the vertical reinforcing ribs in the vertical reinforcing grooves and original horizontally-distributed steel bars of the shear wall, and all the vertical reinforcing ribs are fixed to the middle positions in the vertical reinforcing grooves; the horizontally-distributed steel bars cut off in the target shear wall are continuously recovered through equal-diameter steel bars; and then concrete or grouting materials are poured into all the vertical reinforcing grooves, and the target shear wall is reinforced after the concrete or grouting materials in the vertical reinforcing grooves are solidified and formed. The method provided by the invention is low in construction difficulty and reinforcement cost.

Description

Technical Field

[0001] The invention relates to building construction technology, in particular to a local slotting replacement reinforcement method for a concrete shear wall. Background Art

[0002] The shear walls of new or existing buildings often fail to meet structural safety requirements due to the quality of concrete materials or construction technology. In this case, reinforcement measures must be taken for the shear walls.

[0003] Since conventional reinforcement methods such as increasing the cross-section and pasting steel plates will affect the usable space of the building, buildings with high requirements for usable space usually use replacement concrete reinforcement methods to reinforce the components.

[0004] The existing replacement concrete reinforcement method is to chisel out the concrete at the defective part and then recast the area with new concrete or other structural materials. The advantage of this reinforcement method is that the material, cross-sectional dimensions and strength of the reinforced components are consistent with the design requirements and can better meet the functional requirements. However, the vertical concrete shear wall structure has the following problems when using this reinforcement method: 1) More temporary support measures are needed, but since the original low-strength concrete shear wall bears the load of all upper floors, it is difficult to take effective temporary support measures for the upper load, and it is very easy to cause the upper building to collapse when the concrete is removed; 2) For shear walls with limited construction conditions on one side, such as the outer wall of the shear wall and the wall of the elevator shaft, it is difficult to provide a construction working surface outside the building and inside the elevator shaft, which makes the construction difficult and the reinforcement cost high. Summary of the invention

[0005] In view of the defects existing in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a local grooving replacement reinforcement method for concrete shear walls that can reduce the temporary support measures required for construction, can be constructed on one side of the shear wall, and does not affect the original use area and function of the building after the wall is reinforced.

[0006] In order to solve the above technical problems, the present invention provides a method for local slotting, replacement and reinforcement of concrete shear walls, which is characterized by the following specific steps: 1) A plurality of vertical reinforcement grooves are excavated on one side of the target shear wall of the target floor at intervals along the horizontal direction; The vertical reinforcement groove is a vertical linear groove with a rectangular radial cross section, and the vertical reinforcement groove extends downward to the next floor of the target floor and extends upward to the previous floor of the target floor; 2) Multiple vertical reinforcement bars are placed in each vertical reinforcement groove, and multiple U-shaped steel bars are placed in each vertical reinforcement groove. The U-shaped steel bars in the same vertical reinforcement groove are distributed at intervals along the vertical direction, and are welded with the vertical reinforcement bars and horizontal distribution steel bars in the vertical reinforcement groove, so that each vertical reinforcement bar is fixed in the center position in the vertical reinforcement groove, and the vertically adjacent vertical reinforcement bars are fixed to each other by threaded connection; 3) Use steel bars of equal diameter to connect and restore the cut horizontal distributed steel bars in the target shear wall; 4) Pour concrete or grouting material into each vertical reinforcement groove. When the concrete or grouting material in the vertical reinforcement groove solidifies, the reinforcement of the target shear wall is completed.

[0007] Furthermore, the width of the vertical reinforcement groove is 1 to 3 times the depth.

[0008] Furthermore, the strength grade of the concrete poured in the vertical reinforcement groove is higher than the strength grade of the original concrete of the target shear wall.

[0009] The local slotting replacement reinforcement method for concrete shear walls provided by the present invention adopts a local slotting replacement reinforcement structure to reduce the temporary support measures required for conventional replacement concrete construction, and the local slotting replacement reinforcement structure only needs to be operated on one side of the shear wall, which can adapt to the situation where the construction conditions on one side are limited, such as the exterior wall or the elevator shaft wall. The wall thickness can also remain unchanged after reinforcement, and does not affect the building's use area and function. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of a top view of a structure of excavating a vertical reinforcement groove in a target shear wall in a local groove replacement reinforcement method for a concrete shear wall according to an embodiment of the present invention; Figure 2 It is a front structural schematic diagram of a local slotting, replacement and reinforcement method for a concrete shear wall according to an embodiment of the present invention, in which a vertical reinforcement slot is excavated in a target shear wall. DETAILED DESCRIPTION

[0011] The following is a further detailed description of an embodiment of the present invention in conjunction with the accompanying drawings, but this embodiment is not intended to limit the present invention. All similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention represent the relationship of and, and the English letters in the present invention are case-sensitive.

[0012] like Figure 1 , Figure 2 As shown, a method for local slotting, replacement and reinforcement of a concrete shear wall provided by an embodiment of the present invention is characterized in that the specific steps are as follows: 1) A plurality of vertical reinforcement grooves 1 are excavated on one side wall surface of a target shear wall 8 (shear wall to be reinforced) of a target floor and are distributed at intervals in the horizontal direction; The vertical reinforcement groove 1 is a vertical linear groove with a rectangular radial cross section. The width of the vertical reinforcement groove 1 is 1 to 3 times the depth, and the vertical reinforcement groove 1 extends downward to the next floor of the target floor (the floor to be reinforced), and extends upward to the upper floor of the target floor, so as to meet the anchorage length requirements of the subsequently buried vertical reinforcement ribs 2. The extension length is determined according to the anchorage requirements of the vertical reinforcement ribs (the height of the vertical reinforcement groove in this embodiment extending to the upper and lower adjacent floors is 2 / 3 of the floor height, which not only ensures the anchorage of the vertical reinforcement steel bars, but also ensures the operating space for pouring concrete). When the vertical reinforcement groove 1 is excavated, the horizontal distribution steel bars 4 in the target shear wall will be cut off, but damage to other steel bars in the target shear wall should be avoided; The vertical reinforcement groove 1 is formed by static cutting process to avoid vibration damage to the surrounding original concrete; 2) A plurality of vertical reinforcing ribs 2 are placed in each vertical reinforcing groove 1, and a plurality of U-shaped steel bars 3 are placed in each vertical reinforcing groove 1. Each U-shaped steel bar 3 in the same vertical reinforcing groove is distributed at intervals in the vertical direction, and is welded with the vertical reinforcing ribs 2 and the horizontal distribution steel bars 4 in the vertical reinforcing groove, so that each vertical reinforcing rib 2 is fixed in the center position in the vertical reinforcing groove, and the vertically adjacent vertical reinforcing ribs 2 are fixedly connected to each other by threaded connection; the vertical reinforcing ribs can be made of steel bars, thick steel bars or steel sections; 3) Use steel bars 5 of equal diameter to connect and restore the cut horizontal distributed steel bars 4 in the target shear wall, and weld the restored steel bars to the horizontal distributed steel bars 4 in the target shear wall on one side for 10d; 4) Pour concrete or grouting material into each vertical reinforcement groove 1, and wait for the concrete or grouting material in the vertical reinforcement groove to solidify and form, and the reinforcement of the target shear wall is completed; The strength grade of the concrete poured in the vertical reinforcement groove 1 is higher than the strength grade of the original concrete of the target shear wall.

[0013] In the embodiment of the present invention, an inverted tapered groove 7 is excavated at the top of the vertical reinforcement groove 1 as a pouring port for concrete or slurry.

[0014] In the embodiment of the present invention, the slotting position of the vertical reinforcement slot 1 should avoid the edge member 6 of the target shear wall, because the steel bars in the edge member 6 are dense and difficult to replace.

[0015] The embodiments of the present invention should be implemented in sections under the premise of ensuring the safety of the superstructure to avoid excessive grooving at one time, which may lead to insufficient bearing capacity of the shear wall.

Claims

1. A method for local slotting, replacement and reinforcement of concrete shear walls, characterized in that: The specific steps are as follows: 1) A plurality of vertical reinforcement grooves are excavated on one side of the target shear wall of the target floor at intervals along the horizontal direction; The vertical reinforcement groove is a vertical linear groove with a rectangular radial cross section, and the vertical reinforcement groove extends downward to the next floor of the target floor and extends upward to the previous floor of the target floor; 2) Multiple vertical reinforcement bars are placed in each vertical reinforcement groove, and multiple U-shaped steel bars are placed in each vertical reinforcement groove. The U-shaped steel bars in the same vertical reinforcement groove are distributed at intervals along the vertical direction, and are welded with the vertical reinforcement bars and horizontal distribution steel bars in the vertical reinforcement groove, so that each vertical reinforcement bar is fixed in the center position in the vertical reinforcement groove, and the vertically adjacent vertical reinforcement bars are fixed to each other by threaded connection; 3) Use steel bars of equal diameter to connect and restore the cut horizontal distributed steel bars in the target shear wall; 4) Pour concrete or grouting material into each vertical reinforcement groove. When the concrete or grouting material in the vertical reinforcement groove solidifies, the reinforcement of the target shear wall is completed.

2. The method for local slotting, replacement and reinforcement of concrete shear walls according to claim 1 is characterized in that: The width of the vertical reinforcement groove is 1 to 3 times the depth.

3. The method for local slotting, replacement and reinforcement of concrete shear walls according to claim 1, characterized in that: The strength grade of the concrete poured in the vertical reinforcement channel is higher than the strength grade of the original concrete of the target shear wall.

Images