Air bag pushing device and construction method of underground diaphragm wall

Abstract

According to the air bag pushing device and the construction method of the underground diaphragm wall, the air bag pushing device suitable for construction of the underground diaphragm wall is designed, and water stop steel plates are embedded in a first underground diaphragm wall and a second underground diaphragm wall to be matched with positioning electromagnets of the air bag pushing device, so that positioning installation of the air bag pushing device is achieved; then, based on the counter-acting force of the first underground diaphragm wall which is constructed firstly, the second underground diaphragm wall reinforcement cage is horizontally pushed to be in closure butt joint through the air bag pushing device, after the air bag pushing device is hoisted away, the third underground diaphragm wall reinforcement cage is hoisted to occupy the space where the original air bag pushing device is located, and concrete pouring is conducted; according to the underground diaphragm wall, the whole underground diaphragm wall is sealed, so that the underground diaphragm wall at the position of the pipeline can be uninterruptedly and effectively seal soil above and below the existing pipeline in the vertical direction on the premise that the existing pipeline can be normally used, the underground diaphragm wall is integrally formed, and the waterproof and stress performance of an underground structure can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an air bag jacking device and a construction method for an underground continuous wall. Background Art

[0002] In addition, there is a huge potential for energy saving in building urban underground spaces. The stable temperature and humidity conditions in underground spaces help to reduce energy consumption in underground spaces, such as reducing the need for air conditioning and heating systems. In addition, underground continuous walls also help reduce carbon emissions by reducing the use of materials and resources during construction.

[0003] However, there are great challenges in the management of existing pipelines in the development of urban underground space. Generally, existing pipelines need to be relocated during underground space construction to prevent them from directly passing through the enclosure of the newly built underground structure. If the design of retaining existing pipelines is adopted, it will be difficult to design waterproofing and hole reinforcement for the gaps between the pipelines and the enclosure structure.

[0004] With regard to the prior art design of retaining existing pipelines, there is a problem that it is difficult to design waterproofing of the gaps around the pipelines and between the surrounding structures and the hole reinforcements. Technical personnel in this field have been looking for solutions. Summary of the invention

[0005] The purpose of the present invention is to provide an airbag jacking device and an underground continuous wall construction method, which can achieve uninterrupted underground continuous wall at the pipeline location while retaining the normal use of existing pipelines, effectively seal the soil vertically above and below the existing pipeline, and form an underground continuous wall in one piece, which is beneficial to improving the waterproof and stress-bearing performance of the underground structure.

[0006] In order to solve the above technical problems, the present invention provides an airbag pushing device, which includes: two parallel head end plates, a piston wall arranged between the two head end plates and sealed with the two head end plates to form a cavity, an airbag arranged in the cavity, and two positioning electromagnets respectively arranged on the outsides of the two head end plates; wherein, the piston wall and / or the head end plate are pre-set with air holes connected to the cavity.

[0007] The present invention also provides a construction method of an underground continuous wall, the construction method of the underground continuous wall comprising the following steps:

[0008] S1. Construction preparation stage:

[0009] Two second underground continuous wall steel cages are prepared according to the existing pipelines at the construction location, so that the two second underground continuous wall steel cages can be connected and butt-jointed to form a reserved hole for accommodating the pipeline;

[0010] Prefabricate two third underground continuous wall steel cages, two groups of embedded water-stop steel plate pairs and two groups of airbag jacking devices according to construction requirements; wherein the number of embedded water-stop steel plate pairs in each group of embedded water-stop steel plate pairs is the same as the number of airbag jacking devices as claimed in claim 1 in each group of airbag jacking devices; wherein each group of embedded water-stop steel plate pairs includes a plurality of embedded water-stop steel plate pairs, and each embedded water-stop steel plate pair includes a first embedded water-stop steel plate and a second embedded water-stop steel plate;

[0011] S2. Reserved space for the second underground continuous wall steel cage and the airbag jacking device is reserved on both sides of the pipeline, and the first underground continuous wall is constructed outside the two reserved spaces; wherein, on the side of each first underground continuous wall close to the pipeline, a first embedded water-stop steel plate in the middle of a group of embedded water-stop steel plates extending to the edge of the first underground continuous wall is embedded at intervals in the vertical direction;

[0012] S3, two second underground continuous wall steel cages are suspended to both sides of the pipeline, and the distance between each second underground continuous wall steel cage and the pipeline is at least 20 cm; wherein, on the side of each second underground continuous wall steel cage away from the pipeline, a second pre-embedded water-stop steel plate in a group of pre-embedded water-stop steel plates extending to the edge of the second underground continuous wall is pre-embedded at intervals in the vertical direction, and the second pre-embedded water-stop steel plate is symmetrically distributed with the first pre-embedded water-stop steel plate and is located on the same horizontal line;

[0013] S4, respectively hanging two groups of airbag pushing devices to the remaining reserved space between the first underground continuous wall and the second underground continuous wall steel cage on both sides of the pipeline, and positioning each airbag pushing device in each group of airbag pushing devices between the first underground continuous wall and the second underground continuous wall steel cage on both sides thereof;

[0014] S5. Under the reaction force of the two first underground continuous walls, two groups of airbag pushing devices push the two second underground continuous wall steel cages horizontally until they are connected;

[0015] S6, pouring concrete on the two jointed second underground continuous wall reinforcement cages to form a second underground continuous wall;

[0016] S7. All the air bag jacking devices between the first underground continuous wall and the second underground continuous wall are lifted off, and a third underground continuous wall steel cage is lifted off in the space where each set of the lifted air bag jacking devices is located, and concrete is poured on the two third underground continuous wall steel cages to achieve the closure of the entire underground continuous wall.

[0017] Optionally, in the underground continuous wall construction method, in S1, the process of preparing two second underground continuous wall reinforcement cages according to existing pipelines at the construction location includes the following steps:

[0018] Prefabricate the second underground continuous wall steel cage body according to the position of the existing pipeline to form a concave shape at a corresponding position on the second underground continuous wall steel cage body, and set a flexible cushion layer in the concave shape;

[0019] Female tongue-and-groove plates and male tongue-and-groove plates are respectively arranged on the sides where two prefabricated second underground continuous wall reinforcement cage bodies are joined and butted.

[0020] Optionally, in the construction method of the underground continuous wall, in S4, each airbag pushing device is positioned and installed between the first embedded water-stopping steel plate exposed on the first underground continuous wall and the second embedded water-stopping steel plate exposed on the steel cage of the second underground continuous wall on both sides thereof.

[0021] Optionally, in the construction method of the underground continuous wall, in S4, the process of positioning and installing each airbag jacking device between the first underground continuous wall and the second underground continuous wall steel cage on both sides thereof includes the following steps:

[0022] According to the height of the embedded water-stop steel plate, hang the airbag push device to the approximate height area;

[0023] The positioning electromagnets located on both sides of the airbag pushing device are energized, and a first current is first applied so that the vertical component of the applied electromagnetic force is smaller than the difference between the gravity of the airbag pushing device and the buoyancy it bears;

[0024] The vertical position of the airbag pushing device is adjusted in steps of 2 mm to determine an optimal placement position, wherein the optimal placement position has the smallest lifting force on the airbag pushing device;

[0025] Mechanically fix the hanging device of the airbag pushing device so that the airbag pushing device is in the best placement position;

[0026] The current applied to the positioning electromagnets on both sides of the airbag pushing device is increased so that the airbag pushing device is positioned and installed at the best placement position.

[0027] Optionally, in the construction method of the underground continuous wall, in S5, the process of the airbag pushing device horizontally pushing the second underground continuous wall steel cage is as follows:

[0028] An inclinometer is installed on the top of the second underground continuous wall steel cage on both sides of the pipeline to measure the inclination angle of the airbag pushing device during the pushing of the second underground continuous wall steel cage;

[0029] The airbag of the airbag jacking device is inflated, and under the reaction force of the first underground continuous wall, the airbag jacking device horizontally pushes the steel cage of the second underground continuous wall to move in a direction away from the first underground continuous wall.

[0030] Optionally, in the construction method of the underground continuous wall, during the horizontal jacking process, the inclination angle of the second underground continuous wall steel cage is controlled within ±2° based on controlling the air pressure in the airbag jacking device.

[0031] In the airbag pushing device and the underground continuous wall construction method provided by the present invention, an airbag pushing device suitable for the construction of the underground continuous wall is designed, and the positioning and installation of the airbag pushing device is achieved by pre-embedding water-stop steel plates in the first underground continuous wall and the second underground continuous wall in cooperation with the positioning electromagnet of the airbag pushing device. Then, based on the reaction force of the first underground continuous wall constructed first, the second underground continuous wall steel cage is horizontally pushed by the airbag pushing device to be connected and joined. After being lifted away from the airbag pushing device, the third underground continuous wall steel cage is lifted to occupy the space where the original airbag pushing device was located, and concrete is poured to achieve the closure of the entire underground continuous wall, thereby achieving the uninterrupted underground continuous wall at the pipeline position while retaining the normal use of the existing pipeline, effectively closing the soil vertically above and below the existing pipeline, and forming an underground continuous wall in one piece, which is beneficial to improving the waterproof and stress-bearing performance of the underground structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0033] Figure 1 is a schematic structural diagram of an airbag pushing device in one embodiment of the present invention;

[0034] Figure 2 It is a flow chart of a construction method of an underground continuous wall according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the construction method of the underground continuous wall according to one embodiment of the present invention after executing S4;

[0036] Figure 4 It is a partial top view after executing S4 of the construction method of the underground continuous wall according to one embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the construction method of the underground continuous wall according to one embodiment of the present invention after executing S6;

[0038] Figure 6 It is a partial top view of the construction method of the underground continuous wall according to one embodiment of the present invention after executing S6.

[0039] In the figure:

[0040] 1- The first underground continuous wall;

[0041] 2-second underground continuous wall steel cage; 21-flexible cushion layer; 22-female tongue and groove plate; 23-male tongue and groove plate; 24-head plate;

[0042] 3- The third underground continuous wall steel cage;

[0043] 4-embedded water-stopping steel plate; 41-first embedded water-stopping steel plate; 42-second embedded water-stopping steel plate;

[0044] 5- Inclinometer;

[0045] 6-airbag pushing device; 61-end plate; 62-piston wall; 63-airbag; 64-positioning electromagnet; 65-air hole;

[0046] 7-Lifting device. DETAILED DESCRIPTION

[0047] The following is a further detailed description of the airbag jacking device and the underground continuous wall construction method proposed by the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0048] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0049] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0052] Please refer to Figure 1 , which is a schematic diagram of the structure of the airbag pushing device of the present invention. Figure 1 As shown, the airbag pushing device 6 includes: two parallel head end plates 61, a piston wall 62 arranged between the two head end plates 61 and sealed with the two head end plates 61 to form a cavity, an airbag 63 arranged in the cavity, and two positioning electromagnets 64 respectively arranged on the outside of the two head end plates 61; wherein, the piston wall 62 and / or the head end plate 61 are preset with an air hole 65 connected to the cavity.

[0053] Among them, the piston wall 62 has a telescopic function, and the volume of the airbag 63 can be increased or decreased by inflating or deflating the airbag 63; liquid or gas can enter and exit the cavity of the airbag pushing device 6 through the air hole 65, thereby achieving pressure balance between the cavity and the inside and outside of the airbag pushing device 6.

[0054] The present invention also provides a construction method for an underground continuous wall. Figures 1 to 6 The construction method of the underground continuous wall described in this embodiment is described in detail.

[0055] First, execute step S1, construction preparation stage:

[0056] Two second underground continuous wall steel cages 2 are prepared according to the existing pipelines at the construction location, so that the two second underground continuous wall steel cages 2 can be connected and butt-jointed to form a reserved hole for accommodating the pipeline;

[0057] According to the construction requirements, two third underground continuous wall steel cages 3, two groups of 4 pairs of pre-embedded water-stop steel plates and two groups of airbag pushing devices 6 are prefabricated; wherein, the number of 4 pairs of pre-embedded water-stop steel plates in each group of 4 pairs of pre-embedded water-stop steel plates is the same as the number of airbag pushing devices 6 as described in claim 1 in each group of airbag pushing devices 6; wherein, each group of 4 pairs of pre-embedded water-stop steel plates includes several 4 pairs of pre-embedded water-stop steel plates, and each 4 pairs of pre-embedded water-stop steel plates includes a first pre-embedded water-stop steel plate 41 and a second pre-embedded water-stop steel plate 42. The first pre-embedded water-stop steel plate 41 and the second pre-embedded water-stop steel plate 42 have the same shape, and the difference between the two is that the installation position is different. In actual installation, the two are symmetrically distributed.

[0058] The process of preparing two second underground continuous wall reinforcement cages 2 according to the existing pipelines at the construction location includes the following steps:

[0059] Prefabricate the second underground continuous wall steel cage 2 body according to the position of the existing pipeline to form a concave shape at a corresponding position on the second underground continuous wall steel cage 2 body, and set a flexible cushion layer 21 in the concave shape;

[0060] Please refer to Figure 4 and Figure 6 , female tongue-and-groove plates 22 and male tongue-and-groove plates 23 are respectively arranged on the sides where the two prefabricated second underground continuous wall steel cages 2 bodies are joined and butted. It can be understood that the second underground continuous wall steel cages 2 on both sides of the pipeline are made into corresponding concave shapes at the pipeline positions according to the outer wall shape of the pipeline. The concave shape should meet the requirement that the second underground continuous wall steel cages 2 will not be blocked by the pipeline when they move horizontally, and can be successfully joined on both sides. A flexible cushion layer 21 is arranged at the concave position to prevent the second underground continuous wall steel cages 2 from rigidly colliding with the pipeline.

[0061] Next, execute step S2, reserve space required for placing the second underground continuous wall steel cage 2 and the airbag pushing device 6 on both sides of the pipeline, and first construct the first underground continuous wall 1 at the outer position of the two reserved spaces. The first underground continuous wall 1 will subsequently serve as the reaction force background for the pushing of the second underground continuous wall steel cage 2 on both sides of the pipeline; wherein, on one side of each first underground continuous wall 1 close to the pipeline, a first pre-embedded water-stop steel plate 41 in a pair of pre-embedded water-stop steel plates 4 extending to the edge of the first underground continuous wall 1 is pre-embedded in the vertical direction at intervals.

[0062] Next, execute step S3, and hang two second underground continuous wall steel cages 2 on both sides of the pipeline, and the distance between each second underground continuous wall steel cage 2 and the pipeline is at least 20cm, so as to avoid collision or scratching between the hanging and placing of the second underground continuous wall steel cage 2 and the pipeline. Among them, on the side of each second underground continuous wall steel cage 2 away from the pipeline, a second pre-embedded water-stop steel plate 42 in a pair of pre-embedded water-stop steel plates 4 extending to the edge of the second underground continuous wall is pre-embedded at intervals in the vertical direction, and the second pre-embedded water-stop steel plate 42 is symmetrically distributed with the first pre-embedded water-stop steel plate 41 and is located on the same horizontal line.

[0063] Next, please refer to Figure 3 and Figure 4, execute step S4, respectively hang two groups of airbag pushing devices 6 in the remaining reserved space between the first underground continuous wall 1 and the second underground continuous wall steel cage 2 on both sides of the pipeline, and make each airbag pushing device 6 in each group of airbag pushing devices 6 be positioned and installed between the first underground continuous wall 1 and the second underground continuous wall steel cage 2 on both sides thereof; specifically, each airbag pushing device 6 is positioned and installed between the first pre-embedded water-stopping steel plate 41 exposed on the first underground continuous wall 1 and the second pre-embedded water-stopping steel plate 42 exposed on the second underground continuous wall steel cage 2 on both sides thereof. It can be understood that the pre-embedded water-stopping steel plate 4 in the first underground continuous wall 1 has an exposed connection surface, and the connection surface is not covered with concrete, so that the exposed surface of the pre-embedded water-stopping steel plate 4 is in contact with the positioning electromagnet 64 of the airbag pushing device 6. In this embodiment, each airbag pushing device 6 is hung and installed one by one from bottom to top based on the hanging device 7.

[0064] Further, in S4, the process of positioning and installing each airbag pushing device 6 between the first underground continuous wall 1 and the second underground continuous wall steel cage 2 on both sides thereof includes the following steps:

[0065] According to the arrangement height of the pre-embedded water-stopping steel plates 4, the airbag pushing device 6 is hoisted to the approximate height area; the pre-embedded water-stopping steel plates 4 on the first underground continuous wall 1 are distributed in the vertical direction, and the distribution positions are arranged according to the installation requirements of the airbag 63 pushing positions.

[0066] The positioning electromagnets 64 located on both sides of the airbag pushing device 6 are energized, and a first current is first applied for alignment, so that the vertical component of the applied electromagnetic force is smaller than the difference between the gravity of the airbag pushing device 6 and the buoyancy it bears;

[0067] The vertical position of the airbag pushing device 6 is adjusted in steps of 2 mm to determine the best placement position, wherein the best placement position has the smallest lifting force on the airbag pushing device 6;

[0068] Mechanically fix the hanging device of the airbag pushing device 6 so that the airbag pushing device 6 is in the best placement position;

[0069] The current applied to the positioning electromagnets 64 on both sides of the airbag pushing device 6 is increased so that the airbag pushing device 6 is positioned and installed at the best placement position.

[0070] Next, step S5 is executed. Under the reaction force of the two first underground continuous walls 1, the two groups of airbag pushing devices 6 push the two second underground continuous wall steel cages 2 horizontally until they are connected and butted. At this time, the end plates 24 at both ends of the second underground continuous wall steel cages 2 form a closed space, and the male tongue-and-groove aluminum plates and female tongue-and-groove aluminum plates of the second underground continuous wall steel cages 2 are completely fitted (such as Figure 6As shown). The second underground continuous wall steel cage 2 is provided with a head plate 24 at the end close to the first underground continuous wall 1. After the head plates 24 at both ends of the second underground continuous wall steel cage 2 form a closed space, the second underground continuous wall steel cage 2 on both sides of the pipeline can be poured with concrete. This effectively seals the soil above and below the existing pipeline vertically, which is beneficial to improving the waterproof and stress-bearing performance of the underground structure.

[0071] Specifically, the process of the airbag pushing device 6 horizontally pushing the second underground continuous wall steel cage 2 is as follows:

[0072] An inclinometer 5 is installed on the top of the second underground continuous wall steel cage 2 on both sides of the pipeline to measure the inclination angle of the airbag jacking device 6 during the jacking of the second underground continuous wall steel cage 2; in the horizontal jacking process, based on controlling the air pressure in the airbag jacking device 6, the inclination angle of the second underground continuous wall steel cage 2 is controlled within ±2°, and the position of the second underground continuous wall steel cage 2 is controlled, thereby ensuring that the second underground continuous wall steel cage 2 moves horizontally under the jacking action of the airbag jacking device 6. This supports controlling the position and angle of the second underground continuous wall steel cage 2 when it is closed when the steel cage cannot be observed during underwater construction, and avoiding rigid collision between the second underground continuous wall steel cage 2 and the existing pipeline.

[0073] The airbag 63 of the airbag pushing device 6 is inflated, and under the reaction force of the first underground continuous wall 1, the airbag pushing device 6 horizontally pushes the second underground continuous wall steel cage 2 to move in a direction away from the first underground continuous wall 1.

[0074] Next, please refer to Figure 5 and Figure 6 , execute step S6, pour concrete on the two second underground continuous wall steel cages 2 that are connected together to form a second underground continuous wall.

[0075] Next, execute step S7, lift off all the air bag jacking devices 6 between the first underground continuous wall 1 and the second underground continuous wall, and lift off a third underground continuous wall steel cage 3 in the space where each group of air bag jacking devices 6 are located, and pour concrete on the two third underground continuous wall steel cages 3 to achieve the closure of the entire underground continuous wall.

[0076] Specifically, the process of lifting all the airbag jacking devices 6 located between the first underground continuous wall 1 and the second underground continuous wall includes: cutting off the power to the electromagnet of the airbag 63 jacking device, releasing the mechanical fixation of each pair of airbag 63 jacking devices by the lifting device 7, releasing the gas in the airbag 63 of the airbag jacking device 6, and recovering the airbag 63 jacking device (i.e., lifting the airbag 63 jacking device).

[0077] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0078] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In summary, in the airbag pushing device and the underground continuous wall construction method provided by the present invention, an airbag pushing device suitable for the construction of underground continuous walls is designed, and the positioning and installation of the airbag pushing device is achieved by pre-embedding water-stop steel plates in the first underground continuous wall and the second underground continuous wall in cooperation with the positioning electromagnet of the airbag pushing device. Then, based on the reaction force of the first underground continuous wall constructed first, the airbag pushing device is used to horizontally push the second underground continuous wall steel cage to connect the two ends. After being lifted off the airbag pushing device, the third underground continuous wall steel cage is lifted to occupy the space where the original airbag pushing device was located, and concrete is poured to close the entire underground continuous wall. This ensures that the underground continuous wall at the pipeline position is uninterrupted while retaining the normal use of the existing pipeline, effectively closing the soil vertically above and below the existing pipeline, and forming an underground continuous wall in one piece, which is beneficial to improving the waterproof and stress-bearing performance of the underground structure.

[0080] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An airbag pushing device, characterized in that: include: Two parallel end plates, a piston wall arranged between the two end plates and sealed with the two end plates to form a cavity, an air bag arranged in the cavity, and two positioning electromagnets respectively arranged on the outsides of the two end plates; wherein the piston wall and / or the end plate are preset with air holes connected to the cavity.

2. A construction method for an underground continuous wall, characterized in that: The following steps are involved: S1. Construction preparation stage: Two second underground continuous wall steel cages are prepared according to the existing pipelines at the construction location, so that the two second underground continuous wall steel cages can be connected and butt-jointed to form a reserved hole for accommodating the pipeline; Prefabricate two third underground continuous wall steel cages, two groups of embedded water-stop steel plate pairs and two groups of airbag jacking devices according to construction requirements; wherein the number of embedded water-stop steel plate pairs in each group of embedded water-stop steel plate pairs is the same as the number of airbag jacking devices as claimed in claim 1 in each group of airbag jacking devices; wherein each group of embedded water-stop steel plate pairs includes a plurality of embedded water-stop steel plate pairs, and each embedded water-stop steel plate pair includes a first embedded water-stop steel plate and a second embedded water-stop steel plate; S2. Reserved space for the second underground continuous wall steel cage and the airbag jacking device is reserved on both sides of the pipeline, and the first underground continuous wall is constructed outside the two reserved spaces; wherein, on the side of each first underground continuous wall close to the pipeline, a first embedded water-stop steel plate in the middle of a group of embedded water-stop steel plates extending to the edge of the first underground continuous wall is embedded at intervals in the vertical direction; S3, two second underground continuous wall steel cages are suspended to both sides of the pipeline, and the distance between each second underground continuous wall steel cage and the pipeline is at least 20 cm; wherein, on the side of each second underground continuous wall steel cage away from the pipeline, a second pre-embedded water-stop steel plate in a group of pre-embedded water-stop steel plates extending to the edge of the second underground continuous wall is pre-embedded at intervals in the vertical direction, and the second pre-embedded water-stop steel plate is symmetrically distributed with the first pre-embedded water-stop steel plate and is located on the same horizontal line; S4, respectively hanging two groups of airbag pushing devices to the remaining reserved space between the first underground continuous wall and the second underground continuous wall steel cage on both sides of the pipeline, and positioning each airbag pushing device in each group of airbag pushing devices between the first underground continuous wall and the second underground continuous wall steel cage on both sides thereof; S5. Under the reaction force of the two first underground continuous walls, two groups of airbag pushing devices push the two second underground continuous wall steel cages horizontally until they are connected; S6, pouring concrete on the two jointed second underground continuous wall reinforcement cages to form a second underground continuous wall; S7. All the air bag jacking devices between the first underground continuous wall and the second underground continuous wall are lifted off, and a third underground continuous wall steel cage is lifted off in the space where each set of the lifted air bag jacking devices is located, and concrete is poured on the two third underground continuous wall steel cages to achieve the closure of the entire underground continuous wall.

3. The construction method of underground continuous wall according to claim 2, characterized in that: In S1, the process of preparing two second underground continuous wall reinforcement cages according to the existing pipelines at the construction location includes the following steps: Prefabricate the second underground continuous wall steel cage body according to the position of the existing pipeline to form a concave shape at a corresponding position on the second underground continuous wall steel cage body, and set a flexible cushion layer in the concave shape; Female tongue-and-groove plates and male tongue-and-groove plates are respectively arranged on the sides where two prefabricated second underground continuous wall reinforcement cage bodies are joined and butted.

4. The construction method of underground continuous wall according to claim 2, characterized in that: In S4, each of the airbag pushing devices is positioned and installed between the first pre-buried water-stopping steel plate exposed outside the first underground continuous wall and the second pre-buried water-stopping steel plate exposed outside the steel cage of the second underground continuous wall on both sides thereof.

5. The construction method of underground continuous wall according to claim 4, characterized in that: In S4, the process of positioning and installing each airbag jacking device between the first underground continuous wall and the second underground continuous wall steel cage on both sides thereof comprises the following steps: According to the height of the embedded water-stop steel plate, hang the airbag push device to the approximate height area; The positioning electromagnets located on both sides of the airbag pushing device are energized, and a first current is first applied so that the vertical component of the applied electromagnetic force is smaller than the difference between the gravity of the airbag pushing device and the buoyancy it bears; The vertical position of the airbag pushing device is adjusted in steps of 2 mm to determine an optimal placement position, wherein the optimal placement position has the smallest lifting force on the airbag pushing device; Mechanically fix the hanging device of the airbag pushing device so that the airbag pushing device is in the best placement position; The current applied to the positioning electromagnets on both sides of the airbag pushing device is increased so that the airbag pushing device is positioned and installed at the best placement position.

6. The construction method of underground continuous wall according to claim 2, characterized in that: In S5, the process of the airbag pushing device horizontally pushing the second underground continuous wall steel cage is as follows: An inclinometer is installed on the top of the second underground continuous wall steel cage on both sides of the pipeline to measure the inclination angle of the airbag pushing device during the pushing of the second underground continuous wall steel cage; The airbag of the airbag jacking device is inflated, and under the reaction force of the first underground continuous wall, the airbag jacking device horizontally pushes the steel cage of the second underground continuous wall to move in a direction away from the first underground continuous wall.

7. The construction method of underground continuous wall according to claim 6, characterized in that: During the horizontal pushing process, the inclination angle of the second underground continuous wall steel cage is controlled within ±2° based on controlling the air pressure in the airbag pushing device.

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