A diaphragm retaining structure reinforcement cage isolation device

Abstract

The utility model belongs to the underground continuous wall construction field, especially relates to a kind of underground continuous wall enclosure structure reinforcement cage isolation device, including the H-shaped steel fixed in the both sides of reinforcement cage, anti eddy iron sheet is welded on H-shaped steel, plastic cloth is equipped with on the front and back side of reinforcement cage, plastic cloth is connected together by tie and reinforcement cage main reinforcement, and there is not less than the gap allowance of reinforcement protective layer thickness between plastic cloth and reinforcement cage;Plastic cloth edge portion is pressed by anti eddy iron sheet, and one grouting pipe is fixed on the left and right of plastic cloth upper portion.The device plays the effective isolation effect to the soil of groove wall by plastic cloth, so that after foundation pit excavation, plastic cloth is removed, ground connection wall base surface is smooth, provides good base surface condition for subsequent waterproofing membrane construction, reduces the cost of base surface manual troweling at the same time, also avoids later leakage problem.

Description

Technical Field

[0001] This utility model belongs to the field of underground continuous wall construction, and specifically relates to a steel cage isolation device for underground continuous wall retaining structure. Background Technology

[0002] Diaphragm walls are a type of retaining structure for deep foundation pits, primarily used to prevent groundwater from flowing into the pit and to ensure construction safety. Diaphragm wall trenching typically employs slurry wall construction. After drilling, a reinforcing cage is lowered and concrete is poured. Because the concrete adheres tightly to the trench walls, subsequent excavation of the foundation pit results in an uneven base surface for the diaphragm wall. The soil adhering to the base surface is difficult to clean, leading to higher costs for subsequent finishing and potentially causing large gaps in the subsequent waterproofing layer, resulting in leakage. Summary of the Invention

[0003] The problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a steel cage isolation device for underground continuous wall retaining structure.

[0004] This invention is achieved through the following technical solution: An isolation device for a steel cage in a diaphragm wall retaining structure includes H-beams fixed to the left and right sides of the steel cage. Anti-flow-around iron sheets are welded to the front and rear flanges of the H-beams. The device also includes a plastic sheet located on the front and rear sides of the steel cage. The plastic sheet has several perforations and is connected to the main reinforcement bars of the steel cage by cable ties passing through the perforations. There is a gap between the plastic sheet and the steel cage that is not less than the thickness of the concrete cover of the reinforcement bars. The edge of the plastic sheet is located between the anti-flow-around iron sheets and the steel cage. A grouting pipe is fixed to each of the upper left and right sides of the plastic sheet near the steel cage.

[0005] Preferably, a horizontal square steel bar is fixed to the bottom of the plastic sheet.

[0006] Preferably, the square steel is heat-fused to the plastic cloth.

[0007] Preferably, the bottom end of the plastic sheet is located 1-2m below the bottom end of the foundation pit.

[0008] Preferably, the anti-flow sheet is pressed by vertical reinforcing bars welded to the H-shaped steel wing plate.

[0009] Preferably, the width of the anti-flow sheet metal is 0.5-0.8m.

[0010] Preferably, the width of the edge of the plastic cloth overlapping with the anti-flow iron sheet is 0.4m.

[0011] Preferably, the anti-flow sheet is a galvanized sheet.

[0012] Preferably, the plastic sheet is a polyethylene plastic film.

[0013] Preferably, there is a 6-8cm gap allowance between the plastic sheet and the steel cage.

[0014] The steel cage isolation device for the underground continuous wall retaining structure of the present invention effectively isolates the soil on the trench wall through plastic sheeting. After the foundation pit is excavated, the plastic sheeting is removed, and the underground continuous wall base surface is flat and smooth, providing good base surface conditions for subsequent waterproof membrane construction. At the same time, it reduces the cost of manual plastering of the base surface and avoids leakage problems in the later stage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This is a top view of the structure in this embodiment.

[0016] In the diagram, 1 is H-beam, 2 is reinforcing cage, 3 is anti-flow sheet metal, 4 is plastic sheeting, 5 is perforated, 6 is grouting pipe, 7 is square steel, and 8 is vertical reinforcing bar. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0018] This embodiment includes H-beams 1, which are fixed to the left and right sides of the reinforcing cage 2. During deep foundation pit construction, H-beams 1 are often used to connect sections of the diaphragm wall. The core function of the H-beams 1 is to connect adjacent sections and prevent grout leakage. Because concrete flow around the joints of the sections often occurs—meaning that some concrete from the first-poured diaphragm wall bypasses the H-beams 1 and solidifies into blocks on the unpoured side, solidifying on the web and flanges of the H-beams 1—this is difficult to address later. Therefore, to prevent this, anti-flow sheet metal 3 is typically welded to the front and rear flanges of the H-beams 1. This anti-flow sheet metal 3 is usually made of galvanized iron sheet, which is flexible and can expand outwards during concrete pouring to prevent concrete flow around the diaphragm. In this embodiment, the width of the anti-flow-around sheet metal 3 is between 0.5 and 0.8 m. Furthermore, the anti-flow-around sheet metal 3 is edged by vertical reinforcing bars 8 welded to the flange of the H-beam 1. The vertical reinforcing bars 8 are located at the edge of the anti-flow-around sheet metal 3, further fixing the edge of the anti-flow-around sheet metal 3. Except for the edge, the rest of the anti-flow-around sheet metal 3 can open outward to block the concrete from flowing around the reinforcing cage 2. The H-beam 1 and the anti-flow-around sheet metal 3 are commonly used designs in the construction of existing diaphragm walls, and will not be described in detail here.

[0019] This embodiment also includes a plastic sheet 4, which can be made of polyethylene plastic film with a thickness of 1mm. The plastic sheet 4 is provided on both the front and rear sides of the reinforcing cage 2. Several perforations 5 are provided on the plastic sheet 4. The plastic sheet 4 is connected to the main reinforcement of the reinforcing cage 2 by cable ties passing through the perforations 5. The cable ties are not shown in the attached drawings. Although the plastic sheet 4 is connected to the reinforcing cage 2 by cable ties, the plastic sheet 4 and the reinforcing cage 2 are not tightly bound together. There is a gap between the plastic sheet 4 and the reinforcing cage 2 that is not less than the thickness of the concrete cover. That is, under the impact of concrete, the plastic sheet 4 can move away from the reinforcing cage 2 at a certain distance and adhere tightly to the trench wall. Since the thickness of the concrete cover of a typical underground continuous wall is between 5-7cm, it is preferable that there is a gap of 6-8cm between the plastic sheet 4 and the reinforcing cage 2. During concrete pouring, the plastic sheet 4 can be 6-8cm away from the reinforcing cage 2, allowing it to be pressed against the trench wall. The left and right edges of the plastic sheet 4 are located between the anti-flow iron sheet 3 and the reinforcing cage 2. The anti-flow iron sheet 3 is used to press the edges of the plastic sheet 4. Preferably, the width of the overlap between the edge of the plastic sheet 4 and the anti-flow iron sheet 3 is 0.4m, that is, the width of the anti-flow iron sheet 3 pressing the plastic sheet 4 is 0.4m. The bottom of the plastic sheet 4 is preferably located 1-2m below the bottom of the excavated pit (excavation surface). That is, the plastic sheet 4 does not need to be at the same height as the H-beam 1 or the reinforcing cage 2. The bottom of the plastic sheet 4 only needs to be a certain distance from the bottom of the excavated pit. The bottom of the plastic sheet 4 is higher than the bottom of the H-beam 1 or the bottom of the reinforcing cage 2, or in other words, the plastic sheet 4 does not need to reach the bottom of the pit. To prevent the bottom of the plastic sheet 4 from floating upwards during concrete pouring, it is preferable to fix a horizontal square steel 7 at the bottom of the plastic sheet 4 for supporting the plastic sheet 4. Preferably, the square steel 7 is heat-fused to the plastic sheet 4.

[0020] On the upper left and right sides of the plastic sheet 4 near the steel cage 2, fix a grouting pipe 6. The grouting pipe 6 can be heat-fused to the plastic sheet 4. The grouting pipe 6 is used to prevent leakage at the joint during the later excavation of the foundation pit. Grouting can be carried out in time through the grouting pipe 6.

[0021] During construction, plastic sheeting 4 is first laid flat on both sides of the reinforcing cage 2. Plastic cable ties are used to connect the plastic sheeting 4 to the main reinforcement bars of the reinforcing cage 2. Then, anti-flow-around sheeting 3 is welded to the H-beam 1. Anti-flow-around sheeting 3 is only welded to the outer edge of the H-beam 1 flange. Vertical reinforcing bars 8 are then welded to the outer edge of the anti-flow-around sheeting 3 to secure it. One side of the anti-flow-around sheeting 3 presses down on the plastic sheeting 4 for edge securing. After securing the plastic sheeting 4, the reinforcing cage 2 is lifted and lowered into the trench. Concrete is poured into the reinforcing cage. During concrete pouring, the concrete inside the reinforcing cage 2 presses the plastic sheeting 4 against the trench walls on both sides, while the anti-flow-around sheeting 3 also expands outwards to abut against the trench walls. The plastic sheeting 4 effectively isolates the soil from the trench walls. After the foundation pit is excavated, the plastic sheeting 4 is removed, leaving a smooth and flat base surface for the diaphragm wall, providing good base conditions for subsequent waterproof membrane construction and reducing the cost of manual surface finishing.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A steel cage isolation device for a continuous underground wall retaining structure, comprising H-beams (1), the H-beams (1) being fixed on the left and right sides of the steel cage (2), and anti-flow-around iron sheets (3) being welded to the front and rear flanges of the H-beams (1), characterized in that: It also includes a plastic sheet (4), which is located on the front and rear sides of the steel cage (2). The plastic sheet (4) has several perforations (5). The plastic sheet (4) is connected to the main reinforcement of the steel cage (2) by a tie that passes through the perforations (5). There is a gap between the plastic sheet (4) and the steel cage (2) that is not less than the thickness of the steel reinforcement protective layer. The edge of the plastic sheet (4) is located between the anti-flow sheet (3) and the steel cage (2). A grouting pipe (6) is fixed on each side of the upper part of the side of the plastic sheet (4) near the steel cage (2).

2. The steel cage isolation device for underground continuous wall retaining structure according to claim 1, characterized in that: The bottom of the plastic sheet (4) is fixed with a horizontal square steel (7).

3. The steel cage isolation device for underground continuous wall retaining structure according to claim 2, characterized in that: The square steel (7) and the plastic cloth (4) are heat-fused together.

4. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The bottom of the plastic sheet (4) is located 1-2m below the bottom of the foundation pit.

5. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The anti-flow sheet metal (3) is pressed by the vertical reinforcing bars (8) welded to the flange of the H-beam (1).

6. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The width of the anti-flow sheet metal (3) is 0.5-0.8m.

7. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The width of the edge of the plastic sheet (4) overlapping with the anti-flow iron sheet (3) is 0.4m.

8. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The anti-flow sheet (3) is a galvanized sheet.

9. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: The plastic sheet (4) is a polyethylene plastic film.

10. The steel cage isolation device for underground continuous wall retaining structure according to claim 1 or 2, characterized in that: There is a 6-8cm gap allowance between the plastic sheet (4) and the steel cage (2).

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