Pipe jacking underneath pass structure for controlling deformation of bridge pile foundation and construction method of pipe jacking underneath pass structure

Abstract

The invention relates to the technical field of municipal construction, and discloses a jacking pipe underneath pass structure for controlling deformation of a bridge pile foundation and a construction method thereof, the jacking pipe underneath pass structure comprises a first jacking pipe, a second jacking pipe, a first isolation pile group, a second isolation pile group, a top beam, a connecting beam and a connecting plate; a first isolation pile set and a second isolation pile set are arranged on the two sides of the first jacking pipe and the two sides of the second jacking pipe correspondingly. The first isolation pile group and the second isolation pile group are both arranged at the bridge pile foundation; the top of the first isolation pile group and the top of the second isolation pile group are fixedly connected with top beams; connecting beams are fixedly connected between the top beams on the two sides of the first jacking pipe and the top beams on the two sides of the second jacking pipe. The connecting plate is fixedly connected between the two first isolation pile sets between the first jacking pipe and the second jacking pipe. The first isolation pile set, the second isolation pile set, the top beam, the connecting beam and the connecting plate are connected into a whole, direct connection between a soil body in a pipe jacking construction interval and a bridge foundation is blocked, deformation of the bridge pile foundation is controlled in the pipe jacking construction process, and safe construction of pipe jacking is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of municipal construction, and in particular to a pipe-jacking structure for controlling deformation of a bridge pile foundation and a construction method thereof. Background Art

[0002] With the increasing networking and scale of urban rail transit, rail transit and municipal facilities are developing rapidly in parallel. The spatial interlacing between rail transit, municipal tunnels and the foundations of existing bridges is inevitable. At the same time, the limitations of the surrounding building environment require close or close crossing between tunnels and bridges.

[0003] When the pipe-jacking tunnel is constructed under a bridge, the bridge foundation is prone to deformation, causing additional deformation of the piers and upper beam structure and generating secondary internal forces, which affects the normal use of the bridge during the construction of the pipe-jacking tunnel and cannot ensure the safe construction of the pipe-jacking tunnel. Summary of the invention

[0004] The purpose of the present invention is to provide a pipe-jacking structure for controlling the deformation of bridge pile foundations, so as to control the deformation of bridge pile foundations during tunnel construction and ensure construction safety; the present invention also provides a pipe-jacking structure construction method for the pipe-jacking structure for controlling the deformation of bridge pile foundations.

[0005] In order to achieve the above object, the present invention provides a jacking pipe underpass structure for controlling the deformation of a bridge pile foundation, comprising a first jacking pipe, a second jacking pipe, a first isolation pile group, a second isolation pile group, a cap beam, a connecting beam and a connecting plate;

[0006] The first jacking pipe and the second jacking pipe are arranged in parallel and spaced apart, the first isolation pile group and the second isolation pile group are respectively provided on both sides of the first jacking pipe, and the first isolation pile group and the second isolation pile group are respectively provided on both sides of the second jacking pipe, the first isolation pile group is provided on the side where the first jacking pipe and the second jacking pipe are close to each other, and the second isolation pile group is provided on the side where the first jacking pipe and the second jacking pipe are far away from each other; the first isolation pile group and the second isolation pile group are both provided at the bridge pile foundation to reinforce the bridge pile foundation, and there is a gap between the first isolation pile group and the bridge pile foundation, and between the second isolation pile group and the bridge pile foundation;

[0007] There are multiple crown beams, and the top of the first isolation pile group and the top of the second isolation pile group are both fixedly connected with the crown beam, and the crown beam extends along the length direction of the first jacking pipe or the second jacking pipe;

[0008] The connecting beam extends along the width direction of the first top tube or the second top tube, and a plurality of the connecting beams are arranged at intervals along the length direction of the crown beam. The connecting beams are fixedly connected between the crown beams on both sides of the first top tube and between the crown beams on both sides of the second top tube.

[0009] The connecting plate is fixedly connected between two groups of the first isolation piles between the first jacking pipe and the second jacking pipe.

[0010] Preferably, the connecting plate comprises a middle plate and end plates, there are two groups of end plates, the two groups of end plates are connected to both ends of the crown beam in the length direction, and there are multiple middle plates, each of which is spaced apart between the two groups of end plates.

[0011] Preferably, anchoring steel bars are provided in both the end plates and the middle plates, and both ends of the anchoring steel bars are anchored and assembled in the crown beam.

[0012] Preferably, the first isolation pile group includes a plurality of first isolation pile bodies, each of which is arranged at intervals along the length direction of the first jacking pipe or the second jacking pipe; the second isolation pile group includes a plurality of second isolation pile bodies, each of which is arranged at intervals along the length direction of the first jacking pipe or the second jacking pipe; the tops of the first isolation pile bodies and the tops of the second isolation pile bodies are connected by the crown beam.

[0013] Preferably, the bottom end of the second isolation pile body is supported on the foundation bearing layer, and the bottom end of the first isolation pile body is supported on the non-soft foundation soil layer. The length of the second isolation pile body is defined as H, and the buried depth of the first jacking pipe and the second jacking pipe is defined as W, and H≥2W.

[0014] Preferably, the first isolation pile body and the second isolation pile body both include a pile body, a steel cage and longitudinal steel bars, the steel cage is arranged in the pile body, the longitudinal steel bars penetrate the pile body in a vertical direction, and the top ends of the longitudinal steel bars are anchored in the cap beam.

[0015] Preferably, two ends defining the length direction of the connecting beam are respectively a first end and a second end, and the first end is arranged at the same height as the second end.

[0016] The present invention also provides a construction method of a jacking pipe underpass structure, which is used for the jacking pipe underpass structure for controlling the deformation of a bridge pile foundation as described in any of the above technical solutions, and comprises the following steps:

[0017] S1, locate the positions of the first isolation pile group and the second isolation pile group, the longitudinal position deviation range of the first isolation pile group and the second isolation pile group is -20ˉ+20mm, and the lateral position deviation of the first isolation pile group and the second isolation pile group is 0ˉ50mm;

[0018] S2, constructing the first isolation pile body and the second isolation pile body according to the positions located in step S1, firstly setting a steel casing in the foundation during the construction of the first isolation pile body and the second isolation pile body, pouring concrete in the steel casing, and bonding the concrete and the steel casing to form the first isolation pile body and the second isolation pile body;

[0019] S3, casting a crown beam on the top of the first isolation pile group and the second isolation pile group, respectively, and anchoring the longitudinal steel bars of the first isolation pile body and the second isolation pile body in the crown beam;

[0020] S4, constructing a connecting beam and a connecting plate, wherein both ends of the connecting beam are respectively connected to the crown beam, and the first end and the second end of the connecting beam are kept at the same height.

[0021] Preferably, in step S2, the first isolation pile body of the first isolation pile group and the second isolation pile body of the second isolation pile group are constructed using a skipping pile construction process.

[0022] Preferably, in step S4, the span of the connecting beam is defined as L. When L≥8m, the connecting beam adopts an arch structure, and the arch height is L / 400.

[0023] Compared with the prior art, the embodiment of the present invention provides a jacking pipe underpass structure for controlling the deformation of a bridge pile foundation and a construction method thereof, and its beneficial effects are as follows: a first isolation pile group and a second isolation pile group are respectively arranged on both sides of a first jacking pipe and a second jacking pipe, and gaps are arranged between the first isolation pile group, the second isolation pile group and the bridge pile foundation, and each isolation pile group near the bridge pile foundation is used as a reinforcement pile to strengthen the bridge pile foundation, and at the same time, a crown beam is connected to the top of the isolation pile group, and connecting beams and connecting plates are arranged between the crown beams, so that the first isolation pile group, the second isolation pile group, the crown beam, the connecting beam and the connecting plate are connected into an integral structural system, which can block the direct connection between the soil in the jacking pipe construction area and the bridge foundation, control the deformation of the bridge pile foundation during the jacking pipe construction process, and ensure the safe construction of the jacking pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a jacking pipe underpass structure for controlling deformation of a bridge pile foundation according to the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of the assembly between the isolation pile body and the cap beam of the jacking pipe underpass structure for controlling the deformation of the bridge pile foundation;

[0026] Figure 3 It is a schematic plan view of a jacking pipe underpass structure for controlling deformation of a bridge pile foundation according to the present invention;

[0027] Figure 4 It is a schematic diagram of the arrangement of the isolation pile group of the jacking pipe underpass structure for controlling the deformation of the bridge pile foundation of the present invention.

[0028] In the figure, 1, the first jacking pipe, 11, the second jacking pipe, 2, the first isolation pile group, 21, the first isolation pile body, 22, the pile body, 23, the steel cage, 24, the longitudinal steel bars, 3, the crown beam, 4, the connecting beam, 5, the bridge pile foundation, 6, the bridge, 7, the second isolation pile group, 71, the second isolation pile body, 8, the connecting plate, 81, the middle plate, 82, the end plate, 83, the anchor steel bars. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] A preferred embodiment of a jacking pipe underpass structure for controlling deformation of a bridge pile foundation of the present invention is as follows: Figures 1 to 4 As shown, the jacking pipe underpass structure for controlling the deformation of the bridge pile foundation includes a first jacking pipe 1, a second jacking pipe 11, a first isolation pile group 2, a second isolation pile group 7, a cap beam 3, a connecting beam 4 and a connecting plate 8.

[0031] The first jacking pipe 1 and the second jacking pipe 11 are arranged in parallel and spaced apart, and the first jacking pipe 1 is provided with a first isolation pile group 2 and a second isolation pile group 7 on both sides, and the second jacking pipe 11 is provided with a first isolation pile group 2 and a second isolation pile group 7 on both sides. In this embodiment, the first jacking pipe 1 is located between two adjacent bridge pile foundations 5, the second jacking pipe 11 is located between two adjacent bridge pile foundations 5, and the first jacking pipe 1 and the second jacking pipe 11 are located in different bridge holes under the bridge 6.

[0032] The first isolation pile group 2 is arranged on the side where the first jacking pipe 1 and the second jacking pipe 11 are close to each other, and the second isolation pile group 7 is arranged on the side where the first jacking pipe 1 and the second jacking pipe 11 are far away from each other. That is, in this embodiment, there are two first isolation pile groups 2 and two second isolation pile groups 7, the two first isolation pile groups 2 are close to each other, and the two second isolation pile groups 7 are far away from each other.

[0033] The first isolation pile group 2 and the second isolation pile group 7 are both arranged near the bridge pile foundation 5 to reinforce the bridge pile foundation 5, and there are gaps between the first isolation pile group 2 and the bridge pile foundation 5, and between the second isolation pile group 7 and the bridge pile foundation 5. Since the isolation pile group 2 is close to the bridge pile foundation 5, the bridge pile foundation 5 of the existing bridge 6 can be strengthened, and during the construction of the two jacking pipes in close proximity, the impact of the jacking pipe construction on the bridge pile foundation 5 is reduced, thereby ensuring the safety of the existing bridge 6.

[0034] There are multiple crown beams 3, and the top of the first isolation pile group 2 and the top of the second isolation pile group 7 are fixedly connected with the crown beam 3. The crown beam 3 extends along the length direction of the first jacking tube 1 or the second jacking tube 11, wherein the length direction is the driving direction of the vehicle on the first jacking tube 1 or the second jacking tube 11, that is, the crown beam 3 is a full-length beam extending along the length direction of the first jacking tube 1 and the second jacking tube 11. The crown beam 3 connects the various structural piles in the first isolation pile group 2 and the second isolation pile group 7 as a whole, thereby improving the stability of the bridge 6 structure.

[0035] The connecting beam 4 extends along the width direction of the first jacking pipe 1 or the second jacking pipe 11, and a plurality of connecting beams 4 are arranged at intervals along the length direction of the crown beam 3. The connecting beams 4 are fixedly connected between the crown beams 3 on both sides of the first jacking pipe 1 and between the crown beams 3 on both sides of the second jacking pipe 11, that is, the two ends of the connecting beam 4 are respectively connected to the crown beams 3 on both sides of a jacking pipe, so as to connect the crown beams 3 on both sides of the first jacking pipe 1 and the second jacking pipe 2 as a whole. The first jacking pipe 1 and the second jacking pipe 11 are arranged in a gate-shaped structure formed by connecting the connecting beam 4, the crown beam 3, the first isolation pile group 2 and the second isolation pile group 7, which increases the stability of the soil foundation around the first jacking pipe 1 and the second jacking pipe 11 and improves the stability of the existing bridge 6 structure.

[0036] The connecting plate 8 is fixedly connected between the two groups of first isolation pile groups 2 between the first jacking pipe 1 and the second jacking pipe 11. The connecting plate 8 is fixedly connected the gate-shaped structure on the outside of the first jacking pipe 1 and the gate-shaped structure on the outside of the second jacking pipe 11, so that the first isolation pile group 2, the second isolation pile group 7, the crown beam 3 and the connecting plate 8 form an integral structure, blocking the direct connection between the soil in the jacking pipe construction area and the bridge foundation.

[0037] The jacking pipe underpass structure for controlling the deformation of the pile foundation of the bridge 6 is provided with a first isolation pile group 2 and a second isolation pile group 7 on both sides of the first jacking pipe 1 and the second jacking pipe 11, respectively, and a gap is arranged between the first isolation pile group 2, the second isolation pile group 7 and the bridge pile foundation 5, and each isolation pile group near the bridge pile foundation 5 is used as a reinforcement pile to strengthen the bridge pile foundation 5, and at the same time, a crown beam 3 is connected to the top of the isolation pile group, and a connecting beam 4 and a connecting plate 8 are arranged between the crown beams 3, so that the first isolation pile group 2, the second isolation pile group 7, the crown beam 3, the connecting beam 4 and the connecting plate 8 are connected as an integral structural system, which can block the direct connection between the soil in the jacking pipe construction area and the foundation of the bridge 6, control the deformation of the bridge pile foundation 5 during the jacking pipe construction process, and ensure the safe construction of the jacking pipe.

[0038] Preferably, the connecting plate 8 includes a middle plate 81 and end plates 82 . There are two groups of end plates 82 , which are connected to both ends of the crown beam 3 in the length direction. There are multiple middle plates 81 , and each middle plate 81 is arranged between the two groups of end plates 82 at intervals.

[0039] The end plates 82 and the plurality of middle plates 81 cooperate with each other to connect the crown beam 3 , the first isolation pile group 2 and the second isolation pile group 7 into a whole, thereby increasing the structural strength and reducing the overall mass of the connection plate 8 .

[0040] Preferably, anchoring steel bars 83 are provided in both the end plates 82 and the middle plates 81 , and both ends of the anchoring steel bars 83 are anchored and assembled in the crown beam 3 .

[0041] Both ends of the anchoring steel bars 83 in the end plate 82 and the middle plate 81 are anchored in the crown beam 3, which increases the structural strength of the connection between the end plate 82, the middle plate 81 and the crown beam 3, thereby increasing the overall strength of the entire system.

[0042] Preferably, the first isolation pile group 2 includes a plurality of first isolation pile bodies 21, each of which is spaced apart along the length direction of the first jacking pipe 1 or the second jacking pipe 11; the second isolation pile group 7 includes a plurality of second isolation pile bodies 71, each of which is spaced apart along the length direction of the first jacking pipe 1 or the second jacking pipe 11; the tops of the first isolation pile bodies 21 and the tops of the second isolation pile bodies 71 are connected by a crown beam 3.

[0043] A plurality of first isolation pile bodies 21 form a first isolation pile group 2, a plurality of second isolation pile bodies 71 form a second isolation pile group 7, and the first isolation pile bodies 21 and second isolation pile bodies 71 of the crown beam 3 are connected as a whole, thereby ensuring the strength of the entire system.

[0044] Preferably, the bottom end of the second isolation pile body 71 is supported on the foundation bearing layer, and the bottom end of the first isolation pile body 21 is supported on the non-weak foundation soil layer. The length of the second isolation pile body 71 is defined as H, and the burial depth of the first jacking pipe 1 and the second jacking pipe 11 is defined as W, and H≥2W.

[0045] The second isolation pile body 71 is arranged on the side away from the first jacking pipe 1 and the second jacking pipe 11, so the bridge pile foundation 5 close to the second isolation pile body 71 is reinforced by only one second isolation pile group 7, that is, the bridge pile foundation 5 has the second isolation pile body 71 as a reinforcement pile only on one side, and the bottom end of the second isolation pile body 71 is supported on the foundation bearing layer, which can increase the stability of the second isolation pile group 7 and improve the reinforcement effect of the bridge pile foundation 5. In this embodiment, the depth of the first isolation pile body 21 is less than the depth of the second isolation pile body 71, and the second isolation pile body 71 is embedded in the weathered granite 1.5m as a reinforcement pile.

[0046] Preferably, the first isolation pile body 21 and the second isolation pile body 71 both include a pile body 22 , a steel cage 23 and longitudinal steel bars 24 , the steel cage 23 is disposed in the pile body 22 , the longitudinal steel bars 24 vertically penetrate the pile body 22 , and the top ends of the longitudinal steel bars 24 are anchored in the crown beam 3 .

[0047] The longitudinal steel bars 24 of the first isolation pile body 21 and the second isolation pile body 71 penetrate the pile body 22 in the vertical direction, and the top ends are anchored in the crown beam 3, thereby increasing the structural strength of the connection between the crown beam 3 and the first isolation pile body 21 and the second isolation pile body 71, and further increasing the structural strength of the first isolation pile group 2 and the second isolation pile group 7, so as to further improve the stability of the bridge pile foundation 5.

[0048] Preferably, two ends of the connecting beam 4 in the length direction are defined as a first end and a second end, respectively, and the first end and the second end are arranged at the same height.

[0049] The first end and the second end are arranged at the same height, which can avoid excessive differential settlement between the support points during construction.

[0050] The present invention also provides an embodiment of a construction method of a jacking pipe underpass structure, which is used for the jacking pipe underpass structure for controlling the deformation of a bridge pile foundation in any of the above embodiments, comprising the following steps:

[0051] S1, locate the positions of the first isolation pile group 2 and the second isolation pile group 7, the longitudinal position deviation range of the first isolation pile group 2 and the second isolation pile group 7 is -20ˉ+20mm, and the lateral position deviation is 0ˉ50mm;

[0052] S2, constructing the first isolation pile body 21 and the second isolation pile body 71 according to the positions located in step S1, firstly setting a steel casing in the foundation during the construction of the first isolation pile body 21 and the second isolation pile body 71, pouring concrete in the steel casing, and bonding the concrete and the steel casing to form the first isolation pile body 21 and the second isolation pile body 71;

[0053] S3, casting a crown beam 3 on the top of the first isolation pile group 2 and the second isolation pile group 7, respectively, and anchoring the longitudinal steel bars of the first isolation pile body 21 and the second isolation pile body 71 in the crown beam;

[0054] S4, construct the connecting beam 4 and the connecting plate 8, the two ends of the connecting beam 4 are respectively connected to the crown beam 3, and the first end and the second end of the connecting beam 4 are kept at the same height.

[0055] In step S1, when positioning each first isolation pile group 2 and each second isolation pile group 7, each first isolation pile body 21 in the first isolation pile group 2 and each second isolation pile body 71 in the second isolation pile group 7 are used as references for positioning, ensuring that the longitudinal position deviation range of the first isolation pile body 21 and the second isolation pile body 71 is -20ˉ+20mm, and the lateral position deviation is 0ˉ50mm, while ensuring that the verticality of the first isolation pile body 21 and the second isolation pile body 71 is 0.5%.

[0056] In step S2, since the first isolation pile group 2, the second isolation pile group 7 and the bridge pile foundation 5 are relatively close, the steel casing is first installed to ensure the safety of the bridge 6. After the steel casing is installed in place, the soil layer near the first isolation pile body 21 and the second isolation pile body 71 converges toward the steel casing, and the friction around the steel casing intensifies. After the concrete is poured, the steel casing is pulled out late, the concrete has hardened, and forms a bond with the steel casing, and the steel casing cannot be pulled out at this time.

[0057] The concrete and the steel casing are bonded to form each isolation pile body, that is, the steel casing is not pulled out during the construction process. As a part of each isolation pile body, it can not only increase the strength of each isolation pile body, but also ensure the safety during the construction process.

[0058] In step S3, the longitudinal reinforcement 24 of the first isolation pile body 21 and the second isolation pile body 71 are anchored in the crown beam 3 to increase the strength of the connection position. When the length of the longitudinal reinforcement 24 is insufficient, the anchor connection is made by bending and anchoring in batches.

[0059] Before pouring crown beam 3, first take reliable protection measures for the soil outside the foundation pit to ensure traffic safety, then clean up the residue, loose soil and accumulated water on the top of the pile, chisel and clean it to the designed elevation, then install the crown beam 3 steel bars, support the formwork, and pour concrete to form crown beam 3.

[0060] In step S4, when pouring the connecting beam 4, the first end and the second end are kept at the same height, so that the occurrence of excessive differential settlement between the fulcrums can be avoided during the construction process. The anchoring steel bars 83 in two directions of the connecting plate 8 are anchored in the crown beam 3 in the other direction.

[0061] Preferably, in step S2, the first isolation pile body 21 of the first isolation pile group 2 and the second isolation pile body 71 of the second isolation pile group 7 are both constructed using a skipping pile construction process.

[0062] The use of the skip pile construction process can prevent the impact vibration during the construction of the first isolation pile body 21 and the second isolation pile body 71 from causing the adjacent hole to collapse or affecting the concrete that has been poured into the adjacent hole. In this embodiment, the drilling construction can only be carried out after the concrete of the adjacent first isolation pile body 21 and the second isolation pile body 71 reaches 80% of the design strength.

[0063] Preferably, in step S2, when constructing each isolation pile body 21 under the existing bridge structure, the steel cage 23 is manufactured in sections, and the steel cage 23 includes at least two sections in the length direction of the first isolation pile body 21 and the second isolation pile body 71, and the positions of the steel bar joints at adjacent sections are staggered.

[0064] Since the space under the bridge 6 is height-restricted, the steel cage 23 is made in sections, which can facilitate the assembly of the steel cage 23. The sections of the steel cage 23 are staggered to ensure that the joints of the sections of the steel cage 23 are no more than 50% in the same section, thereby ensuring the overall strength of the steel ridge. In this embodiment, the main reinforcement of the steel cage 23 is mechanically connected by a straight thread sleeve connection. When the steel cage 23 is lowered, effective positioning measures should be taken so that the steel cage 23 is accurately positioned.

[0065] Preferably, in step S4, the span of the connecting beam 4 is defined as L. When L≥8m, the connecting beam 4 adopts an arch structure, and the arch height is L / 400.

[0066] The arching operation of the connecting beam 4 can reduce the settlement of the connecting beam 4. The ground formwork is preferably used during the construction of the connecting beam 4. The ground formwork is constructed by trenching. The soil between the connecting beams 4 should be retained to avoid over-excavation. The crushed stone cushion layer and other methods are adopted to ensure that the ground formwork bearing capacity is not less than 100kPa to avoid the deflection of the concrete support pouring.

[0067] In summary, the embodiments of the present invention provide a pipe-jacking structure for controlling the deformation of a bridge pile foundation and a construction method thereof, wherein a first isolation pile group and a second isolation pile group are respectively arranged on both sides of a first pipe-jacking and a second pipe-jacking, and gaps are arranged between the first isolation pile group, the second isolation pile group and the bridge pile foundation, and each isolation pile group near the bridge pile foundation is used as a reinforcement pile to strengthen the bridge pile foundation, and at the same time, a crown beam is connected to the top of the isolation pile group, and connecting beams and connecting plates are arranged between the crown beams, so that the first isolation pile group, the second isolation pile group, the crown beam, the connecting beam and the connecting plate are connected into an integral structural system, which can block the direct connection between the soil in the pipe-jacking construction area and the bridge foundation, control the deformation of the bridge pile foundation during the pipe-jacking construction process, and ensure the safe construction of the pipe-jacking.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A pipe-jacking structure for controlling deformation of a bridge pile foundation, characterized in that: It includes a first jacking pipe, a second jacking pipe, a first isolation pile group, a second isolation pile group, a crown beam, a connecting beam and a connecting plate; The first jacking pipe and the second jacking pipe are arranged in parallel and spaced apart, the first isolation pile group and the second isolation pile group are respectively provided on both sides of the first jacking pipe, and the first isolation pile group and the second isolation pile group are respectively provided on both sides of the second jacking pipe, the first isolation pile group is provided on the side where the first jacking pipe and the second jacking pipe are close to each other, and the second isolation pile group is provided on the side where the first jacking pipe and the second jacking pipe are far away from each other; the first isolation pile group and the second isolation pile group are both provided at the bridge pile foundation to reinforce the bridge pile foundation, and there is a gap between the first isolation pile group and the bridge pile foundation, and between the second isolation pile group and the bridge pile foundation; There are multiple crown beams, and the top of the first isolation pile group and the top of the second isolation pile group are both fixedly connected with the crown beam, and the crown beam extends along the length direction of the first top pipe or the second top pipe; The connecting beam extends along the width direction of the first top tube or the second top tube, and a plurality of the connecting beams are arranged at intervals along the length direction of the crown beam, and the connecting beams are fixedly connected between the crown beams on both sides of the first top tube and between the crown beams on both sides of the second top tube; The connecting plate is fixedly connected between two groups of the first isolation piles between the first jacking pipe and the second jacking pipe.

2. The pipe-jacking structure for controlling the deformation of bridge pile foundation according to claim 1 is characterized in that: The connecting plate comprises a middle plate and an end plate. There are two groups of the end plates, and the two groups of the end plates are connected to both ends of the crown beam in the length direction. There are multiple middle plates, and each of the middle plates is arranged between the two groups of the end plates.

3. The pipe-jacking structure for controlling the deformation of bridge pile foundation according to claim 2 is characterized in that: Anchor steel bars are provided in the end plates and the middle plates, and both ends of the anchor steel bars are anchored and assembled in the crown beam.

4. The pipe-jacking structure for controlling the deformation of a bridge pile foundation according to any one of claims 1 to 3, characterized in that: The first isolation pile group includes a plurality of first isolation pile bodies, each of which is arranged at intervals along the length direction of the first jacking pipe or the second jacking pipe; the second isolation pile group includes a plurality of second isolation pile bodies, each of which is arranged at intervals along the length direction of the first jacking pipe or the second jacking pipe; the tops of the first isolation pile bodies and the tops of the second isolation pile bodies are connected by the crown beam.

5. The pipe-jacking structure for controlling the deformation of bridge pile foundation according to claim 4 is characterized in that: The bottom end of the second isolation pile body is supported on the foundation bearing layer, and the bottom end of the first isolation pile body is supported on the non-soft foundation soil layer. The length of the second isolation pile body is defined as H, and the buried depths of the first jacking pipe and the second jacking pipe are defined as W, and H≥2W.

6. The pipe-jacking structure for controlling deformation of bridge pile foundation according to any one of claims 1 to 3, characterized in that: The first isolation pile body and the second isolation pile body both include a pile body, a steel cage and longitudinal steel bars. The steel cage is arranged in the pile body. The longitudinal steel bars penetrate the pile body in a vertical direction. The top ends of the longitudinal steel bars are anchored in the cap beam.

7. The pipe-jacking structure for controlling the deformation of a bridge pile foundation according to any one of claims 1 to 3, characterized in that: The two ends of the connecting beam in the length direction are defined as a first end and a second end, and the first end and the second end are arranged at the same height.

8. A construction method for a pipe-jacking structure, used for the pipe-jacking structure for controlling deformation of a bridge pile foundation as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, locate the positions of the first isolation pile group and the second isolation pile group, the longitudinal position deviation range of the first isolation pile group and the second isolation pile group is -20ˉ+20mm, and the lateral position deviation of the first isolation pile group and the second isolation pile group is 0ˉ50mm; S2, constructing the first isolation pile body and the second isolation pile body according to the positions located in step S1, firstly setting a steel casing in the foundation during the construction of the first isolation pile body and the second isolation pile body, pouring concrete in the steel casing, and bonding the concrete and the steel casing to form the first isolation pile body and the second isolation pile body; S3, casting a crown beam on the top of the first isolation pile group and the second isolation pile group, respectively, and anchoring the longitudinal reinforcement of the first isolation pile body and the second isolation pile body in the crown beam; S4, constructing a connecting beam and a connecting plate, wherein both ends of the connecting beam are respectively connected to the crown beam, and the first end and the second end of the connecting beam are kept at the same height.

9. The method for constructing a pipe-jacking structure according to claim 8, characterized in that: In step S2, the first isolation pile body of the first isolation pile group and the second isolation pile body of the second isolation pile group are both constructed using a skipping pile construction process.

10. The method for constructing a pipe-jacking structure according to any one of claims 8 to 9, characterized in that: In step S4, the span of the connecting beam is defined as L. When L≥8m, the connecting beam adopts an arch structure, and the arch height is L / 400.

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