An underground exterior wall anti-seepage device and its application method

Abstract

The present invention discloses an anti-seepage device for an underground exterior wall and its application method. The anti-seepage device for the underground exterior wall includes a closed hollow structure formed by folding a steel plate. The interior of the hollow structure is hollow. One end of the hollow structure is provided with a first water-blocking structure that is recessed inward, and the other end of the hollow structure is provided with a second water-blocking structure that is recessed inward. End encapsulation structures are provided at both ends of the hollow structure, and a grouting pipe and a slurry discharge pipe are connected to the end encapsulation structures. By folding a steel plate into a hollow structure with a hollow interior and burying the device in the wall, the anti-seepage device for the underground exterior wall effectively prevents seepage of the underground exterior wall, changes the randomness of concrete cracks, enables the crack positions of the concrete to be designable, blocks moisture outside the cracks through the anti-seepage device, and achieves the technical purpose of one-time repair and permanent anti-seepage.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering construction, and particularly relates to an anti-seepage device for an underground exterior wall and an application method thereof. Background Art

[0002] In recent years, there have been more and more underground and underwater projects such as subways and tunnels in China. The concrete of the underground exterior wall structure is in a service environment of positive water pressure. Especially when the water level is relatively high, the concrete is required to have good impermeability. However, due to the relationship of the structural characteristics, the concrete of the underground exterior wall (also known as the "side wall") is extremely prone to cracking. When cracks occur in the concrete, groundwater will seep out through the cracks, resulting in a decline in the overall structural performance of the concrete.

[0003] Generally, the method to solve concrete cracks is to add additives with expansion properties, and it is necessary to strictly control the one-time pouring length of the concrete, and divide the concrete structure into multiple small sections, so as to reduce the internal tensile stress of the concrete in the temperature drop stage and play a role in crack resistance control. However, for the existing products such as crack-resistant agents or expansion agents on the market at present, it is difficult to achieve good crack resistance effects. Combining the current situation of engineering construction, it is basically impossible to divide the construction pouring length into multiple small sections in actual engineering design. Moreover, with the shortage of resources, the concrete raw materials are gradually deteriorating, and there are many influencing factors for the crack resistance performance of the concrete. Therefore, the crack resistance effect of adopting this method is poor, and the cost investment is extremely large, and the actual promotion value is not high.

[0004] For the current crack resistance technology, the generation position of concrete cracks cannot be accurately predicted, that is, the coordinate position where the concrete cracks is random. When cracks occur, then through the plugging and repairing technology, the cracks are repaired, but the concrete structure has already been damaged, and the existing repair materials and repair technologies cannot achieve once and for all. According to on-site visit and investigation, the cracks in the underground structure concrete basically need to be repaired every year, and the resulting costs are gradually increasing, which has also become a pain point in the civil engineering industry. Summary of the Invention

[0005] In order to solve the above problems of concrete cracks and repairs, the present invention provides an effective method for preventing underground exterior wall leakage and an anti-seepage device based on this method, which changes the randomness of concrete cracks, makes the crack position of the concrete designable, blocks the moisture outside the cracks through the anti-seepage device, and realizes the technical purpose of one-time repair and permanent anti-seepage.

[0006] To achieve the above object, on the one hand, the present invention provides an anti-seepage device for an underground exterior wall, which includes a closed hollow structure formed by folding a steel plate. The inside of the hollow structure is hollow; on both sides of the hollow structure, there are multiple groups of horizontally arranged "one"-shaped anchoring structures. One end of the hollow structure is provided with a first water-blocking structure that is recessed inward, and the other end of the hollow structure is provided with a second water-blocking structure that is recessed inward; the transverse section of the first water-blocking structure is a "V" shape with a closed upper opening, and the cross-section of the second water-blocking structure is an inverted "U" shape; both ends of the hollow structure are provided with end encapsulation structures, and a grouting pipe and a slurry discharge pipe are connected to the end encapsulation structures; the grouting pipe includes a first grouting pipe and a second grouting pipe. The first grouting pipe is communicated with the inside of the hollow structure, and the second grouting pipe is communicated with the recess of the second water-blocking structure; the slurry discharge pipe includes a first slurry discharge pipe and a second slurry discharge pipe. The first slurry discharge pipe is communicated with the inside of the hollow structure; the second slurry discharge pipe is communicated with the recess of the second water-blocking structure.

[0007] In the above anti-seepage device for an underground exterior wall, the surface of the anchoring structure is provided with a plurality of protrusions and a plurality of grooves.

[0008] In the above anti-seepage device for an underground exterior wall, the surface of the first water-blocking structure is provided with a plurality of protrusions and a plurality of grooves.

[0009] In the above anti-seepage device for an underground exterior wall, the surface of the second water-blocking structure is provided with a plurality of protrusions and a plurality of grooves.

[0010] On the other hand, the present invention also provides an application method of the above anti-seepage device for an underground exterior wall. The specific steps are as follows:

[0011] When tying the steel bars of the exterior wall structure, the anti-seepage device for the underground exterior wall is arranged perpendicular to the wall surface within the steel bar mesh of the exterior wall structure.

[0012] When pouring concrete, the anti-seepage device for the underground exterior wall is buried into the interior of the concrete exterior wall structure.

[0013] After the heat of hydration of the concrete dissipates, the inside of the anti-seepage device for the underground exterior wall is then filled tightly with a cement slurry having an expansion property to restore the compactness of the wall structure.

[0014] In the above application method, the width of the anti-seepage device for the underground exterior wall is 1 / 5 to 4 / 5 of the thickness of the exterior wall.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: The underground exterior wall anti-seepage device is formed by folding a steel plate into a hollow structure with a hollow center. By burying this device into the wall, it effectively prevents the leakage of the underground exterior wall, changes the randomness of concrete cracks, makes the crack positions of the concrete designable, blocks moisture outside the cracks through the anti-seepage device, and achieves the technical purpose of one-time repair and permanent anti-seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural diagram of the underground anti-seepage device in the present invention;

[0017] Figure 2 is Figure 1 the sectional view taken along line A-A of

[0018] Figure 3 is the sectional view when the anti-seepage device is in use;

[0019] Figure 4 is Figure 3 the partial enlarged view at position B in

[0020] Figure 5 is the flow chart of the application method in the present invention;

[0021] Figures 6-8 is the usage state diagram of the underground anti-seepage device; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes the specific embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] As Figure 1 and Figure 2 shown, an underground exterior wall anti-seepage device includes a hollow structure 10 with a hollow center formed by folding a steel plate into a loop; on both sides of the hollow structure 10, there are multiple groups of horizontally arranged "one"-shaped anchoring structures 20. In this embodiment, the anchoring structures 20 are also formed by bending and compacting steel plates, and the anchoring structures 20 are embedded into the wall to play a fixing role. In addition, to ensure that the anchoring structures 20 can be closely combined with the wall, as Figure 4 shown, a plurality of protrusions 21 and a plurality of grooves 22 are provided on the surface of the anchoring structures 20. In this way, when the anchoring structures 20 are embedded into the wall, the protrusions 21 and the grooves 22 can increase the contact area with the wall, thereby improving the stability of the entire underground exterior wall anti-seepage device in the wall.

[0024] At one end of the hollow structure 10, a first water-blocking structure 30 that is recessed inward is provided. The first water-blocking structure 30 is used to prevent external moisture such as rainwater from seeping into the concrete through cracks. At the other end of the hollow structure 10, a second water-blocking structure 40 that is recessed inward is provided. The second water-blocking structure 40 is used to prevent groundwater on one side of the diaphragm wall from seeping into the concrete through cracks.

[0025] As Figure 3 shown, the cross-section of the first water-blocking structure 30 can open into a "V" shape during use, which can play a certain role in storing water. At the same time, a plurality of protrusions and a plurality of grooves are also provided on the surface of the first water-blocking structure 30. When the first water-blocking structure 30 is embedded in the wall, the protrusions and grooves can increase the contact area with the wall, so as to facilitate its firm bonding with the concrete.

[0026] The cross-section of the second water-blocking structure 40 can open into an inverted "U" shape during use, playing a role in guiding flow. At the same time, a plurality of protrusions and a plurality of grooves are also provided on the surface of the second water-blocking structure 40. When the second water-blocking structure 40 is embedded in the wall, the protrusions and grooves can increase the contact area with the wall, so as to facilitate its firm bonding with the concrete.

[0027] As Figure 1 shown, end-sealing structures 50 are provided at both ends of the hollow structure 10. Since the hollow structure 10 is folded from a single steel plate, both ends of the hollow structure 10 are open, and the structure of the end-sealing structure 50 is like a lid, and its function is to seal the hollow structure 10.

[0028] A grouting pipe and a slurry discharge pipe are connected to the end-sealing structure 50. The grouting pipe includes a first grouting pipe 61 and a second grouting pipe 62. The first grouting pipe 61 is communicated with the inside of the hollow structure 10 and is used to grout into the hollow structure 10. The second grouting pipe 62 is communicated with the recess of the second water-blocking structure 30 and is used to grout into the "U" - shaped space of the second water-blocking structure 30 and the cracks on one side of the diaphragm wall.

[0029] The slurry discharge pipe includes a first slurry discharge pipe 71 and a second slurry discharge pipe 72. The first slurry discharge pipe 71 is communicated with the inside of the hollow structure 10. Its function is to discharge the gas in the hollow structure when grouting into the first grouting pipe 61 and to serve as an outlet for the overflowing grout. The second slurry discharge pipe 72 is communicated with the recess of the second water-blocking structure 30. Its function is to discharge the gas and moisture in the "U" - shaped space of the second water-blocking structure and the cracks when grouting into the second grouting pipe 62 and to serve as an outlet for the overflowing grout.

[0030] When applying the hollow device of the method for preventing seepage and leakage of the underground exterior wall, the tensile stress generated by the shrinkage deformation of the concrete is released at the hollow device, and cracks are generated in the concrete under the guidance of the hollow device. The cracks are generated along the water-blocking structure, and the originally closed "V" shape of the water-blocking structure opens. The moisture on one side of the diaphragm wall seeps into the concrete structure through the cracks, but is blocked by the second water-blocking structure. The volume of the hollow structure also increases as the cracks expand. After the concrete temperature and the ambient temperature are balanced, grouting is carried out through the grouting pipe to fill the hollow structure and the cracks on the side of the diaphragm wall. The cracks extending from the first water-blocking structure are blocked by existing conventional plugging techniques, so that the wall structure is restored to a complete and dense state.

[0031] The anti-seepage device for the underground exterior wall effectively prevents the seepage of the underground exterior wall by folding a steel plate into a hollow structure with a hollow in the middle and burying the device in the wall, changes the randomness of concrete cracks, makes the crack positions of the concrete designable, blocks the moisture outside the cracks through the anti-seepage device, and achieves the technical purpose of one-time repair and permanent anti-seepage.

[0032] As Figure 5 shown, the present invention also provides an application method of the anti-seepage device for the underground exterior wall. The specific steps are as follows:

[0033] S10: When binding the steel bars of the exterior wall structure, arrange the above-mentioned anti-seepage device for the underground exterior wall vertically in the steel bar mesh of the exterior wall structure. The width of the anti-seepage device for the underground exterior wall is 1 / 5 to 4 / 5 of the exterior wall thickness, as Figure 6 shown;

[0034] S20: When pouring the concrete, bury the anti-seepage device for the underground exterior wall into the interior of the concrete exterior wall structure;

[0035] S30: Due to the self-shrinkage and temperature-drop shrinkage of the concrete, tensile stress is generated inside the concrete and the hollow device becomes the release surface of the concrete tensile stress, and cracks appear at the anti-seepage device of the exterior wall, as Figure 7 shown; then when the water level on one side of the diaphragm wall rises, the self-water-blocking effect of the anti-seepage device for the exterior wall prevents water from passing through, so that the water cannot leak to the outside of the wall; after the heat of hydration of the concrete dissipates, then fill the inside of the hollow device with a cement slurry with expansion performance to make the wall structure restore its density. Specifically, when the heat of hydration inside the concrete structure dissipates, inject a cement slurry with expansion performance through the grouting pipe. When the cement slurry flows out from the slurry discharge pipe, it indicates that the inside of the anti-seepage device for the exterior wall has been filled with the cement slurry. Seal the grouting pipe and the slurry discharge pipe, and cut off the grouting pipe and the slurry discharge pipe exposed outside after the cement slurry hardens, as Figure 8 shown.

[0036] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. An underground exterior wall anti-seepage device, comprising a closed hollow structure formed by folding a steel plate, characterized in that: the interior of the hollow structure is hollow; multiple groups of horizontally arranged "one"-shaped anchoring structures are provided on both sides of the hollow structure, a first water-blocking structure sunken inward is provided at one end of the hollow structure, and a second water-blocking structure sunken inward is provided at the other end of the hollow structure; the transverse section of the first water-blocking structure is a "V" shape with a closed upper opening, and the cross-section of the second water-blocking structure is an inverted "U" shape; end encapsulation structures are provided at both ends of the hollow structure, and a grouting pipe and a slurry discharge pipe are connected to the end encapsulation structures; the grouting pipe includes a first grouting pipe and a second grouting pipe, the first grouting pipe is communicated with the interior of the hollow structure, and the second grouting pipe is communicated with the sunken part of the second water-blocking structure; the slurry discharge pipe includes a first slurry discharge pipe and a second slurry discharge pipe, the first slurry discharge pipe is communicated with the interior of the hollow structure; the second slurry discharge pipe is communicated with the sunken part of the second water-blocking structure.

2. The underground exterior wall anti-seepage device according to claim 1, characterized in that: a plurality of protrusions and a plurality of grooves are provided on the surface of the anchoring structure.

3. The underground exterior wall anti-seepage device according to claim 1, characterized in that: a plurality of protrusions and a plurality of grooves are provided on the surface of the first water-blocking structure.

4. The underground exterior wall anti-seepage device according to claim 1, characterized in that: a plurality of protrusions and a plurality of grooves are provided on the surface of the second water-blocking structure.

5. An application method of the underground exterior wall anti-seepage device according to any one of claims 1-4, characterized in that: when binding the steel bars of the exterior wall structure, the underground exterior wall anti-seepage device is arranged perpendicular to the wall surface within the steel bar mesh of the exterior wall structure; when pouring concrete, the underground exterior wall anti-seepage device is buried into the interior of the concrete exterior wall structure; after the heat of hydration of the concrete dissipates, the interior of the underground exterior wall anti-seepage device is filled and compacted with a cement paste having an expansion property to restore the compactness of the wall structure.

6. The application method according to claim 5, characterized in that: the width of the underground exterior wall anti-seepage device is 1 / 5 to 4 / 5 of the thickness of the exterior wall.

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