Foundation pit plugging construction method and conduit device

Abstract

This invention provides a method for sealing leaks in foundation pits and a conduit device. The method is used to seal soil cavities formed on the outside of the foundation pit retaining structure, as well as leaks or cracks connecting the interior of the foundation pit to the soil cavities. The method includes the following steps: simultaneously introducing thin steel wires, solid sealing material, and a liquid quick-setting agent into the soil cavities through the leaks or cracks. During the introduction of the thin steel wires into the soil cavities, the wires deform and bend upon encountering resistance within the cavities, forming steel wire support structures distributed throughout the cavities. The solid sealing material fills the internal voids of the steel wire support structures, and the liquid quick-setting agent fills the voids between the solid sealing material and the steel wire support structures, thus forming a unified whole between the solid sealing material, the steel wire support structures, and the soil. Finally, the method fills and seals the leaks or cracks. This method enhances the overall strength of the sealing material and significantly reduces the risk of secondary damage and leakage while repairing soil cavities on the outside of the foundation pit retaining structure.

Description

Technical Field

[0001] This invention belongs to the field of construction technology for municipal tunnel working shafts and open-cut foundation pits, and specifically relates to a method for sealing foundation pit leaks and a conduit device. Background Technology

[0002] In related technologies, plain concrete (a structure made of unreinforced concrete or without reinforcing steel bars; plain concrete is in contrast to reinforced concrete, prestressed concrete, etc.) or cement is used to fill and seal the seepage points in the foundation pit. Since the cavities in the outer soil caused by foundation pit leakage are considered hidden works, current foundation pit leakage repair work is mostly limited to the surface of the foundation pit retaining structure, without considering the construction risks that cavities in the outer soil may cause. Furthermore, even if engineers repair the cavities in the outer soil of the foundation pit retaining structure, plain concrete and cement sealing materials are easily washed away under groundwater pressure, causing more serious secondary damage to the foundation pit. Therefore, this method still has its own shortcomings. Summary of the Invention

[0003] The main objective of this invention is to propose a construction method for sealing foundation pits, which aims to enhance the overall strength of the sealing material and significantly reduce the risk of secondary damage and leakage while repairing cavities in the soil outside the retaining structure.

[0004] This invention proposes a method for sealing leaks in foundation pits, used to seal soil cavities formed on the outside of the foundation pit retaining structure and leaks or cracks connecting the interior of the foundation pit to the soil cavities, comprising the following steps:

[0005] Fine steel wires, solid sealing material, and liquid quick-setting agent are simultaneously introduced into the soil cavity through the aforementioned hole or crack. During the introduction of the fine steel wires into the soil cavity, the wires deform and bend upon encountering resistance within the cavity, forming steel wire support structures distributed throughout the cavity. The solid sealing material fills the internal voids of these support structures, and the liquid quick-setting agent fills the voids between the solid sealing material and the support structures, thus integrating the solid sealing material, the support structures, and the soil into a unified whole.

[0006] Fill and seal the hole or the leak.

[0007] In one embodiment, the diameter of the fine steel wire is 0.1-0.5 mm, and the diameter of the solid sealing material is 0.5 cm-4 cm.

[0008] In one embodiment, in the step of simultaneously introducing fine steel wire, solid sealing material, and liquid quick-setting agent into the soil cavity through the hole or the leak, a conduit device is first inserted into the hole or the leak, with one end of the conduit device located inside the soil cavity and the other end located inside the foundation pit, and the fine steel wire, solid sealing material, and liquid quick-setting agent are simultaneously introduced into the soil cavity through the conduit device.

[0009] In one embodiment, the step of removing the conduit device is included before the step of filling and sealing the hole or the leak.

[0010] In one embodiment, prior to the step of inserting the catheter device into the hole or the leak, the step of enlarging the hole or the leak is included so that the size of the hole or the leak is adapted to the catheter device.

[0011] In one embodiment, during the step of widening the hole or the leak, at least a portion of the concrete between the ground reinforcement and the transverse and longitudinal reinforcement of the pit retaining structure is removed.

[0012] In one embodiment, in the step of filling and sealing the hole or the leak, plain concrete or cement is used to fill and seal the hole or the leak.

[0013] The present invention also proposes a conduit device for use in foundation pit sealing construction. In the foundation pit sealing construction, the conduit device is used to be inserted into a hole or crack connecting the interior of the foundation pit and a soil cavity. One end of the conduit device is located inside the soil cavity, and the other end is located inside the foundation pit. The soil cavity is formed on the outside of the foundation pit retaining structure. The device includes a thin steel wire conduit, a sealing material conduit, and a curing agent conduit. The thin steel wire conduit, the sealing material conduit, and the curing agent conduit are connected in a triangular shape.

[0014] In one embodiment, the system further includes binding straps, with the thin steel wire conduit, the sealing material conduit, and the curing agent conduit bound together in a triangular pattern.

[0015] In one embodiment, the thin steel wire conduit, the sealing material conduit, and the curing agent conduit all have the same length and diameter; and / or

[0016] The thin steel wire conduit, the sealing material conduit, and the curing agent conduit are all circular steel pipes; and the binding strap is a steel binding strap; and / or

[0017] There are multiple binding straps, and the multiple binding straps are arranged at intervals.

[0018] In the aforementioned foundation pit sealing method, the thin steel wires deform and bend upon encountering resistance within the soil cavities, forming a steel wire support structure distributed throughout the cavities (for example, the steel wire support structure can be a fine steel wire mesh filling the entire soil cavity). Solid sealing material fills the internal voids of the steel wire support structure, while liquid quick-setting agent fills the voids between the solid sealing material and the steel wire support structure, thus forming a unified whole between the solid sealing material, the steel wire support structure, and the soil. The steel wire support structure acts as a reinforcing rib for the solid sealing material (this foundation pit sealing method can be considered a random reinforcement method), thereby reducing the risk of secondary damage to the foundation pit and minimizing losses caused by foundation pit leakage to the overall project. Furthermore, the steel wire support structure not only serves as a reinforcing rib for the solid sealing material but also slows down the rate at which the solid sealing material is carried out of the soil cavities by seeping groundwater, improving the efficiency of foundation pit leakage emergency repair (improving the efficiency of foundation pit sealing construction). Therefore, the above-mentioned construction method for sealing foundation pits can enhance the overall strength of solid sealing materials, greatly reduce the risk of secondary damage and leakage when repairing cavities in the soil outside the foundation pit retaining structure, and improve the efficiency of emergency repair of leakage water.

[0019] When encountering resistance, the thin steel wires may or may not be inserted into the surrounding soil. When some of the thin steel wires are inserted into the surrounding soil, they can fix the overall sealing material (the overall sealing material formed by solid sealing material, steel wire support structure and liquid quick-setting agent), thereby further reducing the possibility of subsequent secondary damage. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a municipal tunnel working shaft and an open-cut section foundation pit according to an embodiment of the present invention (before soil cavities are formed);

[0021] Figure 2 This is a structural schematic diagram of a municipal tunnel working shaft and an open-cut section foundation pit according to an embodiment of the present invention (after the formation of soil cavities);

[0022] Figure 3 This is a flowchart of a foundation pit sealing construction method according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a catheter device according to an embodiment of the present invention;

[0024] Figure 5 It is along Figure 4 Cross-sectional view of line AA in the middle. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] like Figure 1 As shown, the retaining structure 10 of the municipal tunnel working shaft and the open-cut section foundation pit may have loopholes or cracks 11. Groundwater can enter the foundation pit from the soil 20 outside the retaining structure 10 through these loopholes or cracks 11, causing soil erosion on the soil 20 outside the retaining structure 10, and consequently leading to the formation of soil cavities 21 on the outside of the retaining structure 10 (such as...). Figure 2 (As shown). For example, in the construction of municipal tunnel working shafts and open-cut foundation pits, because the foundation pit retaining structures 10, such as the ground walls, are constructed using a phased and staged trenching and cage casting method, there are tiny gaps (holes or leaks 11) between each ground wall. After the foundation pit is excavated, under the action of external water and soil pressure, groundwater will seep out along these gaps. At the same time, the soil outside the foundation pit retaining structure 10 will be lost under the scouring and carrying action of groundwater, eventually forming soil cavities 21, which will cause a series of engineering safety problems.

[0027] Since the soil cavities 21 caused by water leakage in the foundation pit are considered concealed works, current foundation pit leakage repair work is mostly limited to the surface (inner surface) of the foundation pit retaining structure 10, without considering the construction risks that the soil cavities 21 on the outer side of the foundation pit retaining structure 10 may cause. Furthermore, even if engineers repair the soil cavities 21 on the outer side of the foundation pit retaining structure 10, the sealing materials such as plain concrete and cement are easily washed away under groundwater pressure, causing more serious secondary damage to the foundation pit. Therefore, this method still has its own shortcomings.

[0028] To solve the above problems, such as Figure 3 As shown, this invention provides a method for sealing leaks in foundation pits, used to seal soil cavities 21 formed on the outside of the foundation pit retaining structure 10 and leaks or cracks 11 connecting the interior of the foundation pit to the soil cavities 21. The method includes the following steps:

[0029] In step S310, thin steel wires, solid sealing material, and liquid quick-setting agent are simultaneously introduced into the soil cavity through the leak or crack. During the process of introducing the thin steel wires into the soil cavity, the thin steel wires can deform and bend after encountering resistance in the soil cavity 21, forming steel wire support structures distributed throughout the soil cavity. The solid sealing material can fill the internal gaps of the steel wire support structure, and the liquid quick-setting agent can fill the gaps between the solid sealing material and the steel wire support structure, so that the solid sealing material, the steel wire support structure, and the soil form a whole.

[0030] Step S320: Fill and seal the gaps or cracks.

[0031] In the aforementioned foundation pit sealing construction method, the thin steel wires deform and bend upon encountering resistance within the soil cavities 21, forming steel wire support structures distributed throughout the soil cavities 21 (for example, the steel wire support structure can be a fine steel wire mesh filling the entire soil cavity 21). Solid sealing material fills the internal voids of the steel wire support structure, while liquid quick-setting agent fills the voids between the solid sealing material and the steel wire support structure, making the solid sealing material, the steel wire support structure, and the soil form a unified whole. The steel wire support structure can act as a reinforcing rib for the solid sealing material (the aforementioned foundation pit sealing construction method can be considered a random reinforcement foundation pit sealing construction method), thereby reducing the risk of subsequent secondary damage to the foundation pit and minimizing the losses caused by foundation pit leakage to the overall project. Furthermore, the steel wire support structure not only acts as a reinforcing rib for the solid sealing material but also slows down the rate at which the solid sealing material is carried out of the soil cavities 21 by seeping groundwater, improving the efficiency of foundation pit leakage emergency repair (improving the efficiency of foundation pit sealing construction). Therefore, the above-mentioned construction method for sealing foundation pits can enhance the overall strength of solid sealing materials, greatly reduce the risk of secondary damage and leakage when repairing the soil voids 21 on the outside of the foundation pit retaining structure 10, and improve the efficiency of emergency repair of leakage water.

[0032] When encountering resistance, the thin steel wires may or may not be inserted into the surrounding soil. When some of the thin steel wires are inserted into the surrounding soil, they can fix the overall sealing material (the overall sealing material formed by solid sealing material, steel wire support structure and liquid quick-setting agent), thereby further reducing the possibility of subsequent secondary damage.

[0033] In this embodiment, the diameter of the thin steel wire is 0.1-0.5 mm. This facilitates the deformation and bending of the thin steel wire after encountering resistance within the soil cavity 21, forming a steel wire support structure distributed throughout the soil cavity. More specifically, in this embodiment, the thin steel wire is the same type used to form steel wool balls for kitchenware. It is understood that in other embodiments, when the thin steel wire is a soft steel wire with low hardness and easy bending, the diameter of the thin steel wire can also be greater than 0.5 mm. In some embodiments, especially when the soil cavity 21 is small, the thin steel wire can be steel fiber (a special type of thin steel wire).

[0034] In this embodiment, the diameter of the solid sealing material is 0.5cm-4cm. This facilitates the integration of the solid sealing material, the steel wire support structure, the liquid quick-setting agent, and the soil into a unified whole. Specifically, in this embodiment, the solid sealing material is small stones. It is understood that in other embodiments, the solid sealing material may also be small steel blocks.

[0035] In this embodiment, in the step of simultaneously introducing fine steel wire, solid sealing material, and liquid quick-setting agent into the soil cavity through the hole or crack, specifically in step S310, a conduit device 400 is first inserted into the hole or crack. One end of the conduit device 400 is located inside the soil cavity 21, and the other end is located inside the foundation pit. The fine steel wire, solid sealing material, and liquid quick-setting agent are simultaneously introduced into the soil cavity 21 through the conduit device 400. This facilitates the simultaneous introduction of these three substances into the soil cavity 21. It is understood that in other embodiments, the fine steel wire, solid sealing material, and liquid quick-setting agent can also be directly introduced into the soil cavity 21 through the hole or crack 11. In this case, the conduit device 400 can be omitted.

[0036] In this embodiment, before the step of filling and sealing the hole or leak 11, that is, before step S320, a step of removing the conduit device 400 is included. This allows the conduit device 400 to be reused. It is understood that in other embodiments, the conduit device 400 may not be removed; instead, it can be pushed into the hole or leak 11, directly sealing the hole or leak 11, and then sealing the conduit device 400.

[0037] In this embodiment, before the step of inserting the conduit device 400 into the hole or slit 11, a step of enlarging the hole or slit 11 is included to adapt the size of the hole or slit 11 to the conduit device 400. This allows the same conduit device 400 to adapt to multiple holes or slits 11 of different sizes, eliminating the need to prepare multiple conduit devices 400 of different sizes. It is understood that in other embodiments, conduit devices 400 of corresponding sizes can be prepared for holes or slits 11 of different sizes; in this case, the step of enlarging the hole or slit 11 can be omitted.

[0038] In this embodiment, in the step of widening the hole or crack 11, at least a portion of the concrete between the ground reinforcement and the transverse and longitudinal reinforcement of the foundation pit retaining structure 10 is removed. This makes it very easy to widen the hole or crack 11.

[0039] In this embodiment, in the step of filling and sealing the leaks or cracks 11, that is, in step S320, plain concrete or cement is used to fill and seal the leaks or cracks 11. This makes filling and sealing the leaks or cracks 11 very convenient.

[0040] like Figure 4 and Figure 5As shown, the present invention also provides a conduit device 400 for use in foundation pit sealing construction. In foundation pit sealing construction, the conduit device 400 is used to be inserted into the hole or leak 11 that connects the interior of the foundation pit with the soil cavity 21. One end of the conduit device 400 is located inside the soil cavity 21, and the other end is located inside the foundation pit. The soil cavity 21 is formed on the outside of the foundation pit retaining structure.

[0041] The conduit device 400 includes a thin steel wire conduit 410, a sealing material conduit 420, and a curing agent conduit 430. The thin steel wire conduit 410 is used to guide the thin steel wire, the sealing material conduit 420 is used to guide the solid sealing material, and the curing agent conduit 430 is used to guide the liquid quick-setting agent. The thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 are connected in a triangular pattern. This facilitates the adaptation of the size of the conduit device 400 to the size of the leak or gap 11. It is understood that in other embodiments, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 may also be arranged in a straight line.

[0042] In this embodiment, the conduit device 400 further includes a binding strap 440, and the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 are fixed in a triangular shape by the binding strap 440. This greatly facilitates the fabrication of the conduit device 400. It is understood that in other embodiments, the binding strap 440 may be omitted; in this case, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 can be welded together.

[0043] In this embodiment, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 all have the same length and diameter. This makes it easier to manufacture the conduit device 400. It is understood that in other embodiments, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 may all have different lengths and diameters.

[0044] In this embodiment, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 are circular steel pipes. This not only facilitates the sourcing of materials for manufacturing the conduit device 400 but also allows the conduit device 400 to have good strength. It is understood that in other embodiments, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 may all be plastic pipes.

[0045] In this embodiment, there are multiple binding straps 440, which are arranged at intervals. In this way, the thin steel wire conduit 410, the sealing material conduit 420, and the curing agent conduit 430 can be securely bound together.

[0046] In this embodiment, the cable tie 440 is a steel cable tie. This not only facilitates the fabrication of the conduit device 400 but also allows the conduit device 400 to have better strength. It is understood that in other embodiments, the cable tie 440 may also be a plastic cable tie.

[0047] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A method for sealing leaks in foundation pits, used to seal soil cavities formed on the outside of the foundation pit retaining structure and leaks or cracks connecting the interior of the foundation pit to the soil cavities, characterized in that, Includes the following steps: Fine steel wires, solid sealing material, and liquid quick-setting agent are simultaneously introduced into the soil cavity through the aforementioned hole or crack. During the introduction of the fine steel wires into the soil cavity, the wires deform and bend upon encountering resistance within the cavity, forming steel wire support structures distributed throughout the cavity. The solid sealing material fills the internal voids of these support structures, and the liquid quick-setting agent fills the voids between the solid sealing material and the support structures, thus integrating the solid sealing material, the support structures, and the soil into a unified whole. Fill and seal the hole or leak.

2. The foundation pit sealing construction method as described in claim 1, characterized in that, The diameter of the fine steel wire is 0.1-0.5 mm, and the diameter of the solid sealing material is 0.5 cm-4 cm.

3. The foundation pit sealing construction method as described in claim 1, characterized in that, In the step of simultaneously introducing fine steel wire, solid sealing material and liquid quick-setting agent into the soil cavity through the hole or the crack, a guide pipe device is first inserted into the hole or the crack. One end of the guide pipe device is located inside the soil cavity and the other end is located inside the foundation pit. Fine steel wire, solid sealing material and liquid quick-setting agent are simultaneously introduced into the soil cavity through the guide pipe device.

4. The foundation pit sealing construction method as described in claim 3, characterized in that, Prior to the step of filling and sealing the hole or the leak, the procedure also includes the step of removing the conduit device.

5. The foundation pit sealing construction method as described in claim 3, characterized in that, Before the step of inserting the conduit device into the hole or the leak, the method further includes a step of enlarging the hole or the leak so that the size of the hole or the leak is adapted to the conduit device.

6. The foundation pit sealing construction method as described in claim 5, characterized in that, In the step of widening the hole or the leak, at least a portion of the concrete between the ground reinforcement and the transverse and longitudinal reinforcement of the foundation pit retaining structure is removed.

7. The foundation pit sealing construction method as described in claim 1, characterized in that, In the step of filling and sealing the hole or the leak, plain concrete or cement is used to fill and seal the hole or the leak.

8. A conduit device for use in the foundation pit sealing construction method as described in any one of claims 1-7, wherein in the foundation pit sealing construction method, the conduit device is used to be inserted into a leak or crack connecting the interior of the foundation pit to a soil cavity, one end of the conduit device is located inside the soil cavity, and the other end is located inside the foundation pit, the soil cavity being formed on the outside of the foundation pit retaining structure, characterized in that, It includes a thin steel wire conduit, a sealing material conduit, and a curing agent conduit, which are connected in a triangular shape.

9. The catheter device as claimed in claim 8, characterized in that, It also includes binding straps, and the thin steel wire conduit, the sealing material conduit, and the curing agent conduit are bound together in a triangular shape by the binding straps.

10. The catheter device as claimed in claim 9, characterized in that, The thin steel wire conduit, the sealing material conduit, and the curing agent conduit all have the same length and diameter; and / or The thin steel wire conduit, the sealing material conduit, and the curing agent conduit are all circular steel pipes; and the binding strap is a steel binding strap; and / or There are multiple binding straps, and the multiple binding straps are arranged at intervals.

Images