Treatment structure for foundation subsidence in bridge pile foundation construction in karst area

Abstract

The utility model discloses a treatment structure for foundation subsidence in bridge pile foundation construction in a karst area, the foundation subsidence comprises a pile hole and a ground groove, the pile hole is located in a river channel, the ground groove is located on a river bank close to the pile hole, and the treatment structure comprises a first filling structure and a second filling structure, the first filling structure comprises a first filling layer, a second filling layer and a third filling layer, and the first filling layer, the second filling layer and the third filling layer are sequentially filled in the pile hole from bottom to top; the second filling structure comprises a fourth filling layer, a fifth filling layer and a sixth filling layer, and the fourth filling layer, the fifth filling layer and the sixth filling layer are sequentially filled in the ground groove from bottom to top; the pile holes and the ground grooves are filled in a layered mode, so that the filling materials of all the layers stably support subsidence of the foundation, the filling materials are not prone to loss along with rising of river water, and compared with single-layer filling and multi-layer filling, the cost is lower, and the effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge pile foundation construction, in particular to a treatment structure for foundation settlement in the construction of bridge pile foundations in karst areas. Background Technique

[0002] As an important transportation facility connecting both banks and crossing obstacles, the demand for bridge engineering construction is increasing day by day. During the construction of bridges, pile foundation construction is a fundamental and crucial link. However, in the construction of bridge pile foundations in areas with extremely developed karst, complex geological problems are often encountered. For example, when pile foundation construction is carried out near water areas such as rivers, if the pile hole penetrates through the stratum with extremely developed karst, the phenomenon of slurry sudden loss is very likely to occur. This phenomenon not only seriously hinders the construction progress but also may trigger the collapse and settlement of the riverbank ground, posing a direct threat to surrounding buildings, farmland, etc. Moreover, more complexly, since there is often a permeable gravel layer connected to the river near the river, the rise and fall of the river water will drive the water in the permeable gravel layer to flow in a "piston movement" similar to that, exacerbating the slurry loss and cavity expansion in the collapse and settlement area, and ultimately may form a large slurry pond, further increasing the risk of geological disasters.

[0003] Currently, in the face of the collapse and settlement of the riverbank ground in karst areas and the serious slurry leakage problem in the pile holes during bridge pile foundation construction, backfilling methods such as sand and gravel, soil, rubble + soil, or ordinary concrete are usually adopted. Although traditional backfilling methods can alleviate the above problems to a certain extent, there are still significant limitations: 1. Sand and gravel backfilling: Due to the gaps between the sand and gravel particles, it is difficult to form a tight filling layer. Under the influence of the permeable gravel layer, the water in these gaps will undergo "piston movement" with the rise and fall of the river water, not only unable to effectively prevent the further development of the collapse but may even exacerbate the expansion of the settlement surface, forming a more unstable geological environment; 2. Soil backfilling: The soil is easily formed into slurry under the soaking of water and will be lost with the rise and fall of the river water, and may accelerate the settlement process, forming a slurry pond, further threatening the surrounding safety; 3. Rubble + soil backfilling: Although the rubble can increase the strength of the backfill body to a certain extent, the gaps between the rubble and the easy loss of the soil, and the soil is soaked into slurry and lost with the river water, ultimately may lead to incomplete backfill treatment and the settlement problem still exists; 4. Ordinary concrete backfilling: Although ordinary concrete has high strength and durability, its large consumption, high cost, and relatively slow setting speed may also be affected by the rise and fall of the river water and be lost, affecting the backfill effect. Content of the Utility Model

[0004] The purpose of the present utility model is to provide a treatment structure for foundation subsidence during the construction of bridge pile foundations in karst areas, so as to solve the problems in the prior art that when using backfilling means to deal with the problems of riverbank ground collapse and subsidence and slurry leakage during the construction of bridge pile foundations in karst areas, the backfilling materials are prone to loss, it is difficult to form a stable support, and the cost is high.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A treatment structure for foundation subsidence during the construction of bridge pile foundations in karst areas, the foundation subsidence includes a pile hole and a ground groove. The pile hole is located in the river channel, and the ground groove is located on the riverbank near the pile hole. The permeable gravel layer at the bottom of the ground groove communicates with the river channel. The treatment structure includes:

[0007] A first filling structure, the first filling structure includes a first filling layer, a second filling layer and a third filling layer. The first filling layer, the second filling layer and the third filling layer are filled in the pile hole from bottom to top in sequence;

[0008] A second filling structure, the second filling structure includes a fourth filling layer, a fifth filling layer and a sixth filling layer. The fourth filling layer, the fifth filling layer and the sixth filling layer are filled in the ground groove from bottom to top in sequence.

[0009] According to the above technical means, by separately filling the pile hole and the ground groove in a layered manner, the filling materials of each layer provide stable support for the subsidence of the foundation, are not easily lost with the rise and fall of the river water, and compared with single-layer filling, multi-layer filling has lower cost and better effect. Specifically, in the pile hole, the first, second and third filling layers are constructed layer by layer to form a stable and tight filling system, effectively preventing water body penetration and further development of collapse, and enabling the smooth progress of bridge pile foundation construction; at the same time, the fourth, fifth and sixth filling layers in the ground groove are tightly filled from bottom to top. By utilizing the characteristics of the filling materials of each layer, it not only enhances the bearing capacity of the foundation, but also blocks the direct connection between the permeable gravel layer and the river channel, avoiding slurry loss and aggravated subsidence, thus significantly improving the stability and safety of the foundation.

[0010] Further, the first filling layer is a layer of rubble, and the layer of rubble is laid on the karst-developed formation at the bottom of the pile hole.

[0011] According to the above technical means, the first filling layer is designed as a layer of rubble and laid on the karst-developed formation at the bottom of the pile hole, which enhances the support force and stability at the bottom of the pile hole. Moreover, the layer of rubble, with its firm characteristics and large particle gaps, can effectively disperse and bear the pressure from the upper structure, is not easily lost, and at the same time reduces the erosion effect of water body penetration on the karst formation, thereby effectively preventing further collapse at the bottom of the pile hole and providing a solid foundation for subsequent pile foundation construction.

[0012] Further, the second filling layer is a gravelly soil layer, and the gravelly soil layer is laid on the rubble layer.

[0013] According to the above technical means, laying gravelly soil on the rubble layer as the second filling layer further improves the stability and compactness of the backfill structure in the pile hole; the gravelly soil layer can effectively fill the gaps between the particles of the rubble layer, reduce the situation of water body permeating through the gaps and scouring the inner wall of the pile hole, and at the same time increase the friction and cohesion between the rubbles, which helps to form a more compact overall structure, prevent the loss of filling materials, not only enhance the supporting effect of the backfill material on the side wall of the pile hole, prevent the side wall from collapsing, but also effectively isolate the erosion of the groundwater on the pile hole, providing an important guarantee for the stability of the bridge pile foundation.

[0014] Further, the third filling layer is a concrete layer Ⅰ, and the concrete layer Ⅰ is poured on the gravelly soil layer and extends to the water surface of the river where there is a bridge pile foundation.

[0015] According to the above technical means, pouring the concrete layer Ⅰ on the gravelly soil layer as the third filling layer and extending it to the river water surface to support the bridge pile foundation enhances the overall strength and durability of the backfill structure; the high-strength characteristic of the concrete layer Ⅰ can effectively resist the pressure from the pile foundation and its upper structure, prevent the backfill body from deforming or being damaged, and at the same time its good sealing property further isolates the erosion of the water body on the overall backfill structure, ensuring the long-term stability and firmness of the backfill structure in the pile hole, and also providing a solid support platform for the bridge pile foundation, ensuring the safety and stability of the bridge structure.

[0016] Further, the fourth filling layer is a plurality of woven bag layers, and each woven bag layer is laid on the permeable gravel layer at the bottom of the ground groove.

[0017] According to the above technical means, using a plurality of woven bags as the fourth filling layer and laying them on the permeable gravel layer at the bottom of the ground groove, taking advantage of the water isolation and stacking stability of the woven bags, effectively blocking the direct hydraulic connection between the permeable gravel layer and the upper backfill material, thus preventing the "piston movement" caused by the rise and fall of the river water from scouring and eroding the backfill material, thereby protecting the backfill structure from being damaged, increasing the overall strength and stability of the backfill structure, helping to resist the risks of ground settlement and collapse, and providing a strong guarantee for the safety of the bridge pile foundation and its surrounding foundation.

[0018] Further, the fifth filling layer is a medium-coarse sand layer Ⅰ, and the medium-coarse sand layer Ⅰ is laid on the woven bag layer to fill the gaps between the woven bags.

[0019] According to the above technical means, a layer of medium-coarse sand I is laid on the woven bags as the fifth filling layer to fill the gaps between the woven bags, further improving the compactness and stability of the ground groove backfill structure; and the medium-coarse sand I has good water permeability, which can balance the fluctuation of the groundwater level to a certain extent. It can not only prevent the penetration of water bodies and mud, but also play the role of a transition layer, making the upper backfill material and the woven bag layer form a closer combination, enhancing the overall bearing capacity and deformation resistance of the backfill structure, and providing a solid guarantee for the long-term safety and stability of the bridge pile foundation and its surrounding foundation.

[0020] Further, the sixth filling layer is a concrete layer II, and the concrete layer II is poured on the medium-coarse sand I layer and extends to be flush with the ground of the river bank.

[0021] According to the above technical means, a concrete layer II is poured on the medium-coarse sand I layer as the sixth filling layer and extends to be flush with the ground of the river bank, enhancing the overall strength and durability of the ground groove backfill structure; the high-strength characteristic of the concrete layer II ensures that the backfill body can withstand the pressure from the upper load and geological stress to prevent the recurrence of ground settlement and collapse; at the same time, the good flatness and compactness of the concrete provide favorable conditions for the restoration of the river bank ground and subsequent construction. It not only enhances the overall connection between the backfill structure and the river bank ground, improves the stability and safety of the backfill structure, but also lays a solid foundation for the long-term safety and stability of the bridge pile foundation and its surrounding environment.

[0022] Further, the woven bags are filled with straw and medium-coarse sand II, and the straw and medium-coarse sand II are laid in sequence from bottom to top.

[0023] According to the above technical means, the straw has good water absorption and certain toughness. It can not only absorb and disperse the water that may accumulate in the woven bags, reducing the adverse impact of water on the stability of the backfill material, but also enhance the compressive performance of the woven bags to a certain extent to prevent them from cracking when subjected to external forces. The medium-coarse sand II, with its good water permeability and close arrangement between particles, fills the gaps between the straws, forming a more compact and stable filling structure; the combination of straw and medium-coarse sand II not only improves the overall strength and stability of the woven bag layer, but also enhances its anti-scouring and anti-erosion capabilities, providing strong support for the long-term safety and stability of the ground groove backfill structure.

[0024] Further, a quick-setting agent is added to the concrete in both the concrete layer I and the concrete layer II.

[0025] According to the above technical means, by adding a quick-setting agent to the concrete, the efficiency of concrete solidification and forming is improved, enabling the concrete to reach the initial setting and final setting states in a shorter time, thereby enhancing the early strength and stability of the backfill structure, achieving rapid support for the pile holes and ground grooves, preventing the further development of collapse and subsidence, improving the construction efficiency, and creating favorable conditions for the smooth progress of the bridge project.

[0026] Furthermore, it also includes a concrete pump truck and a concrete conduit. The concrete pump truck is provided with a feed inlet and a discharge outlet. One end of the concrete conduit is connected to the discharge outlet of the concrete pump truck, and the other end can extend to the third filling layer in the pile hole or the sixth filling layer in the ground groove to pour concrete.

[0027] According to the above technical means, the concrete pump truck provides a storage and transmission power source for the concrete, receives the concrete mixture through the feed inlet, and then transports it to the concrete conduit through the discharge outlet. The concrete conduit is flexible and extendable, and can be accurately positioned to the third filling layer in the pile hole or the sixth filling layer in the ground groove to achieve precise underwater pouring of the concrete. Thus, while pouring the concrete, the water in the pile hole or ground groove can be discharged, which not only makes the concrete dense, but also greatly improves the construction efficiency, reduces the labor input, ensures the uniformity and density of the concrete pouring, and enhances the overall quality of the backfill structure.

[0028] The beneficial effects achieved by the present utility model:

[0029] In the present utility model, by respectively filling the pile hole and the ground groove in a layered manner, the filling materials of each layer stably support the subsidence of the foundation, are not easily lost with the rise and fall of the river water, and compared with single-layer filling, multi-layer filling has lower cost and better effect. Specifically, in the pile hole, the first, second, and third filling layers are constructed layer by layer to form a stable and tight filling system, effectively preventing the penetration of water and the further development of collapse, and enabling the smooth progress of the bridge pile foundation construction; at the same time, the fourth, fifth, and sixth filling layers in the ground groove are tightly filled from bottom to top. By utilizing the characteristics of the filling materials of each layer, it not only enhances the bearing capacity of the foundation, but also blocks the direct connection between the permeable gravel layer and the river channel, avoiding the loss of slurry and the aggravation of subsidence, thereby significantly enhancing the stability and safety of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0031] Figure 2 is a schematic internal structure diagram of the woven bag of the present utility model.

[0032] Among them, 1 - pile hole; 2 - ground groove; 3 - river channel; 41 - first filling layer; 42 - second filling layer; 43 - third filling layer; 51 - fourth filling layer; 511 - straw; 512 - medium - coarse sand II; 52 - fifth filling layer; 53 - sixth filling layer; 6 - permeable gravel layer; 7 - bridge pile foundation; 8 - concrete pump truck; 9 - concrete conduit.

[0033] The attached drawings are only for illustrative purposes and should not be construed as limitations on this patent; for better illustration of this embodiment, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well - known structures and their descriptions in the attached drawings may be omitted; the same or similar reference numerals correspond to the same or similar components; the terms describing the positional relationship in the attached drawings are only for illustrative purposes and should not be construed as limitations on this patent. Specific embodiments

[0034] It should be noted that, without conflict, the embodiments and technical features in the embodiments of this application can be combined with each other. The detailed descriptions in the specific embodiments should be understood as explanatory illustrations of the purpose of this application and should not be regarded as improper limitations on this application.

[0035] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will further describe the specific technical solutions of this application in detail with reference to the attached drawings in the embodiments of this application. The following embodiments are used to illustrate this application but not to limit the scope of this application.

[0036] In the embodiments of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the embodiments of this application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium.

[0038] In the embodiments of the present application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including such element.

[0039] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0040] The technical solutions of the present utility model will be described in detail below with reference to specific drawings.

[0041] This embodiment relates to a treatment structure for foundation settlement during the construction of bridge pile foundations in karst areas, as Figure 1 shown. The foundation settlement includes a pile hole 1 and a ground groove 2. The pile hole 1 is located in a river channel 3, and the bottom geological structure of the pile hole 1 is a karst-developed formation. The ground groove 2 is located on the river bank near the pile hole 1, and the bottom geological structure of the ground groove 2 is a permeable gravel layer 6, and the permeable gravel layer 6 communicates with the river channel 3. The treatment structure includes: a first filling structure, which includes a first filling layer 41, a second filling layer 42 and a third filling layer 43, and the first filling layer 41, the second filling layer 42 and the third filling layer 43 are filled in the pile hole 1 in sequence from bottom to top; a second filling structure, which includes a fourth filling layer 51, a fifth filling layer 52 and a sixth filling layer 53, and the fourth filling layer 51, the fifth filling layer 52 and the sixth filling layer 53 are filled in the ground groove 2 in sequence from bottom to top;

[0042] Specifically, during use, as a preferred embodiment of the present utility model, the first filling layer 41 is a rubble layer, and the rubble layer is laid on the karst-developed formation at the bottom of the pile hole 1; the second filling layer 42 is a sand-gravel soil layer, and the sand-gravel soil layer is laid on the rubble layer; the third filling layer 43 is a first concrete layer, and the first concrete layer is poured on the sand-gravel soil layer and extends to the water surface of the river channel 3 where a bridge pile foundation 7 is provided; the fourth filling layer 51 is a plurality of woven bag layers, and each woven bag layer is laid on the permeable gravel layer 6 at the bottom of the ground groove 2; the fifth filling layer 52 is a first medium-coarse sand layer, and the first medium-coarse sand layer is laid on the woven bag layer to fill the gaps between the woven bags; the sixth filling layer 53 is a second concrete layer, and the second concrete layer is poured on the first medium-coarse sand layer and extends to be flush with the ground of the river bank. Among them, accelerators are added to the concrete in the first concrete layer and the second concrete layer.

[0043] In the specific application of this embodiment, when the slurry in the pile hole 1 suddenly loses during the construction of the bridge pile foundation near waters such as the river channel 3, it is judged that the pile hole 1 has penetrated into the extremely karst-developed formation. First, a certain height of rubble is backfilled on the karst-developed formation at the bottom of the pile hole 1, then a certain height of sand-gravel soil is backfilled, and finally concrete with an accelerator is poured to prevent the river water from flowing out of the pile hole 1. The backfill structure composed of rubble + sand-gravel soil + concrete with an accelerator effectively prevents the further development of the collapse at the bottom of the pile hole 1, ensures the long-term stability and firmness of the backfill structure in the pile hole, and provides a solid support foundation for the construction of the bridge pile foundation 7, ensuring the safety and stability of the bridge structure.

[0044] When a ground groove 2 is formed due to the collapse and subsidence of the river bank near the river channel 3, first, at least two layers of woven bags are laid on the permeable gravel layer 6 at the bottom of the ground groove 2 to block the direct hydraulic connection between the permeable gravel layer 6 and the upper backfill material. Then, 30 cm high of the first medium-coarse sand is laid on the woven bag layer, and finally, concrete with an accelerator is poured, so that the formed second concrete layer is flush with the ground of the river bank. The backfill structure composed of woven bag + first medium-coarse sand + concrete with an accelerator blocks the scouring and soaking of the permeable gravel layer 6 on the overall structure and the soil in the ground groove 2, prevents the further collapse and subsidence of the ground groove 2, and the overall strength and stability of the backfill structure are high, which helps to resist the risks of ground subsidence and collapse, laying a solid foundation for the long-term safety and stability of the bridge pile foundation and its surrounding environment, and improving the construction efficiency. Among them, as Figure 2 shown, the woven bag is filled with rice straw 511 and second medium-coarse sand 512, and the rice straw 511 and the second medium-coarse sand 512 are laid in sequence from bottom to top to enhance the compressive performance, scouring resistance and erosion resistance of the woven bag, providing strong support for the long-term safety and stability of the backfill structure of the ground groove.

[0045] In this embodiment, a concrete pump truck 8 and a concrete conduit 9 are further included. The concrete pump truck 8 is provided with a feed inlet and a discharge outlet. One end of the concrete conduit 9 is communicated with the discharge outlet of the concrete pump truck 8, and the other end can extend to the third filling layer 43 in the pile hole 1 or the sixth filling layer 53 in the ground groove 2 for pouring concrete.

[0046] As Figure 1 shown, the concrete pump truck 8 in this embodiment provides a storage and transmission power source for the concrete. The concrete mixture is received through the feed inlet and then conveyed into the concrete conduit 9 through the discharge outlet. The concrete conduit 9 is flexible and extendable, and can be accurately positioned to the third filling layer 43 in the pile hole 1 or the sixth filling layer 53 in the ground groove 2 to achieve precise underwater pouring of the concrete. Specifically, when the third filling layer 43 in the pile hole 1 or the sixth filling layer 53 in the ground groove 2 needs to be poured with concrete, one end of the concrete conduit 9 is communicated with the discharge outlet of the concrete pump truck 8, and the other end extends underwater into the third filling layer 43 or the sixth filling layer 53. The concrete pump truck 8 starts to provide the transmission power source, and pumps the concrete in the concrete pump truck 8 into the third filling layer 43 or the sixth filling layer 53 through the concrete conduit 9, thereby discharging the water in the pile hole 1 or the ground groove 2 while pouring the concrete. This not only makes the concrete dense, but also greatly improves the construction efficiency, reduces the labor input, ensures the uniformity and density of the concrete pouring, and improves the overall quality of the backfill structure.

[0047] The serial numbers of the embodiments of the present application above are only for description and do not represent the advantages or disadvantages of the embodiments. The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A structure for treating foundation subsidence during the construction of bridge pile foundations in karst areas, the foundation subsidence comprising a pile hole (1) and a ground groove (2), the pile hole (1) being located in a river channel (3), the ground groove (2) being located on a river bank close to the pile hole (1), and a permeable gravel layer (6) at the bottom of the ground groove (2) being connected to the river channel (3), characterized in that: The processing structure includes: A first filling structure, the first filling structure comprising a first filling layer (41), a second filling layer (42) and a third filling layer (43), the first filling layer (41), the second filling layer (42) and the third filling layer (43) being sequentially filled in the pile hole (1) from bottom to top; A second filling structure, wherein the second filling structure comprises a fourth filling layer (51), a fifth filling layer (52) and a sixth filling layer (53), wherein the fourth filling layer (51), the fifth filling layer (52) and the sixth filling layer (53) are sequentially filled in the ground groove (2) from bottom to top.

2. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 1 is characterized in that: The first filling layer (41) is a stone layer, and the stone layer is laid on the karst development stratum at the bottom of the pile hole (1).

3. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 2 is characterized in that: The second filling layer (42) is a sand and gravel soil layer, and the sand and gravel soil layer is laid on the slate layer.

4. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 3 is characterized in that: The third filling layer (43) is a concrete layer I, which is poured on the sandstone soil layer and extends to the water surface of the river channel (3) and is provided with a bridge pile foundation (7).

5. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 4 is characterized in that: The fourth filling layer (51) is a plurality of woven bag layers, each of which is laid on the water-permeable gravel layer (6) at the bottom of the ground groove (2).

6. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 5 is characterized in that: The fifth filling layer (52) is a medium-coarse sand layer I, which is laid on the woven bag layer to fill the gaps between the woven bags.

7. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 6 is characterized in that: The sixth filling layer (53) is a concrete layer II, which is poured on the medium-coarse sand layer I and extends to be flush with the ground surface of the river bank.

8. The structure for treating ground subsidence during bridge pile foundation construction in karst areas according to claim 5 is characterized in that: The woven bag is filled with rice straw (511) and medium-coarse sand II (512), and the rice straw (511) and medium-coarse sand II (512) are laid in sequence from bottom to top.

9. The structure for treating foundation subsidence during bridge pile foundation construction in karst areas according to claim 7 is characterized in that: Accelerator is added to the concrete in both the concrete layer I and the concrete layer II.

10. The structure for treating foundation subsidence in bridge pile foundation construction in karst areas according to claim 9, characterized in that: It also comprises a concrete pump truck (8) and a concrete conduit (9), wherein the concrete pump truck (8) is provided with a feed port and a discharge port, one end of the concrete conduit (9) is connected to the discharge port of the concrete pump truck (8), and the other end of the concrete conduit (9) can extend to the third filling layer (43) in the pile hole (1) or the sixth filling layer (53) in the ground groove (2) to pour concrete.

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