Composite pile group ground anchor system of pipe pushing machine and installation method of composite pile group ground anchor system

Abstract

The invention provides a composite pile group ground anchor system of a pipe pushing machine and an installation method of the composite pile group ground anchor system. The installation method comprises the steps that a shallow foundation pit is excavated; the steel pipe piles are driven into the bottom of the shallow foundation pit and are transversely and longitudinally distributed in multiple rows and columns; the multiple sets of reinforcement cages are arranged on the periphery of the space formed by the steel pipe piles, and a plurality of stirrups are arranged on the periphery of each set of reinforcement cages at intervals; concrete is poured into the shallow foundation pit; the ground anchor plate is arranged on the concrete, and the steel pipe piles penetrate through holes in the ground anchor plate; the pipe pushing machine is located on the ground anchor plate, the center lines of the pipe pushing machine and the ground anchor plate are aligned, the edge of a base of the pipe pushing machine is welded to the ground anchor plate, and then the ground anchor plate and the steel pipe pile are welded and fixed through a fixing piece; and the steel pipe piles, the reinforcement cage, the concrete, the ground anchor plate and the pipe pushing machine base form a resistance system, and the composite pile group ground anchor of the pipe pushing machine is installed. The composite pile group ground anchor system of the pipe pushing machine is formed through the method. A large resistance system is formed, and the strength of a ground anchor system is improved.

Description

Technical Field

[0001] This invention relates to the field of horizontal directional drilling construction technology for oil and gas pipeline installation, specifically to a pipe pusher composite pile anchor system and its installation method. Background Technology

[0002] Pipe pushers are one of the main large-scale construction equipment in the trenchless pipeline industry. They are commonly used in horizontal directional drilling construction sites. When the main drilling rig at the drilling point experiences insufficient output pulling force or pipe jamming, the pipe pusher can provide thrust to the pipeline at the exit point. This creates a synergistic effect of "pulling at the front end and pushing at the rear end" on the pipeline crossing section, which greatly increases the pulling force and reduces the risk of pipe pulling failure.

[0003] Pipe pushers are not equipped with factory-installed ground anchors, so in actual use, self-made non-standard parts are often used as ground anchors. Early directional drilling operations were relatively small-scale, and pipe pushers were used less frequently, requiring less thrust. A simple method involved driving several steel pipes directly into the ground side-by-side, along with crushed stone to replace the low-bearing-capacity topsoil, to bear the reaction force during the pipe pushing process. As the diameter and length of the pipes increase, the ground anchor resistance requirements for pushing the pipe using pipe pushers in pipe-pulling construction become increasingly stringent, necessitating improvements and enhancements to traditional pipe pile ground anchors.

[0004] To address this, the industry has seen methods such as driving Larssen sheet piles into the ground to form a closed rectangular area, then welding lateral and longitudinal supports inside, and finally welding the pusher's base to the internal supports, making the pusher's base, sheet piles, and internal supports a unified whole. This method, through the enclosed space created by the sheet piles, provides lateral restraint to the soil around the base and the enclosed area, improving its lateral and longitudinal bearing capacity. Furthermore, the giant anchor system formed by the pusher, sheet piles, and internal supports can indeed significantly enhance horizontal resistance. However, due to the high cost of driving sheet piles (including the cost of driving and extracting piles and rental fees), it is uneconomical, and the large number of piles and long construction time make it impractical. Therefore, providing a pusher-based composite pile anchor system and its installation method is of great significance. Summary of the Invention

[0005] The purpose of this invention is to address at least one of the aforementioned shortcomings of the prior art. For example, one objective of this invention is to provide a composite pile anchor system for a pusher with a reasonable structure and high strength. Another objective of this invention is to provide an installation method for a composite pile anchor system for a pusher that reduces costs and improves the lateral and longitudinal bearing capacity of the anchor system.

[0006] To achieve the above objectives, the present invention provides an installation method for a composite pile group anchor system for a pipe pusher. The installation method includes: excavating a shallow foundation pit; driving steel pipe piles into the bottom of the shallow foundation pit, with the steel pipe piles arranged in multiple rows and columns, their heads exposed on the natural ground surface; placing multiple sets of reinforcing cages around the periphery of the space formed by the steel pipe piles, with several stirrups spaced apart around each set of reinforcing cages; pouring concrete into the shallow foundation pit; placing anchor plates on the concrete, ensuring that all steel pipe piles pass through holes in the anchor plates; placing the pipe pusher on the anchor plates, aligning their center lines; welding the edge of the pipe pusher base to the anchor plates; and then fixing the anchor plates and steel pipe piles using fixing plates; the steel pipe piles, reinforcing cages, concrete, anchor plates, and pipe pusher base form a resistance system, and the installation of the composite pile group anchor system for the pipe pusher is completed.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the distribution of the steel pipe piles may include: 3 to 4 piles arranged side by side in the front and rear transverse directions, and 1 to 2 piles arranged side by side in the left and right longitudinal directions.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the reinforcing cage may be provided in 2 to 3 groups, and the spacing between each group of reinforcing cages may be 300 to 500 mm; the spacing between two adjacent stirrups may be 150 to 250 mm.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, the reinforcing cage may be disposed on the outer periphery of the space for forming the steel pipe pile and welded and fixed to the steel pipe pile; a longitudinal support may also be disposed in the shallow foundation pit, and the reinforcing cage is spot-welded to the longitudinal support and located on the outer periphery of the space for forming the steel pipe pile.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the reinforcing cage may be formed by braiding steel bars with a diameter of 12-20 mm and model HRB400; the reinforcing cage may be a rectangular closed double-row reinforcing cage, the double-row reinforcing cage may include two rows of main bars arranged in the horizontal direction and two rows of main bars arranged in the vertical direction, and the spacing between the two rows of main bars in the same direction may be 100-150 mm; the stirrups may include hook stirrups, the stirrups may be formed by making steel bars with a diameter of 8-10 mm and model HPB300.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the steel pipe pile may include a DN500 thick-walled steel pipe, which may be 6 to 9 m long; the pipe head of the steel pipe pile may protrude 0.5 to 0.7 m above the natural ground surface.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the installation method may further include: determining the location of the shallow foundation pit before excavation, the determination including: using a GPS measuring instrument to determine the range of the location based on the centerline direction of the pipeline to be pulled back, ensuring that the centerline of the composite pile anchor system of the pipe pusher coincides with the centerline of the pipeline.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the area occupied by the shallow foundation pit may extend 1.5 to 2.5m beyond the front-to-back direction of the pipe pusher base and 1 to 1.5m beyond the left-to-right direction of the pipe pusher base; the shallow foundation pit may be 1.5 to 2m deep.

[0014] According to one or more exemplary embodiments of one aspect of the present invention, the fixing piece may include a triangular steel piece.

[0015] Another aspect of the present invention provides a composite pile anchoring system for a pipe pusher. This system can be formed using the installation method described above. The composite pile anchoring system can be located in a shallow foundation pit and includes steel pipe piles, reinforcing cages, stirrups, concrete, anchor plates, and a pipe pusher base. Multiple rows and columns of horizontally and vertically distributed steel pipe piles are arranged in the shallow foundation pit, with the pipe heads exposed on the natural ground surface. Multiple sets of reinforcing cages are arranged in the shallow foundation pit, surrounding the space formed by the steel pipe piles. Several spaced stirrups are fixedly connected to the outer periphery of each set of reinforcing cages. The shallow foundation pit is filled with concrete, and the anchor plates are located on the concrete. All steel pipe piles pass through holes in the anchor plates. The pipe pusher is mounted on the anchor plates, with their center lines aligned. The edge of the pipe pusher base is fixed to the anchor plates, and the anchor plates and steel pipe piles are fixed together by fixing plates.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The installation method of the composite pile anchor system for the pipe pusher proposed in this invention can meet the increasingly higher anchor resistance requirements required for the pipe pusher to push the pipe during pipe pulling construction.

[0018] (2) The installation method of the composite pile anchor system of the pusher proposed in this invention can effectively reduce costs.

[0019] (3) The lateral and longitudinal bearing capacity of the composite pile anchor system proposed in this invention is significantly improved compared with the anchor system formed by traditional methods. Attached Figure Description

[0020] The above and other objects and features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1A schematic flowchart illustrating an exemplary embodiment of the present invention shows an installation method for a composite pile group anchor system for a pipe pusher.

[0022] Figure 2 A cross-sectional side view of a composite pile anchor system for a pusher, an exemplary embodiment of the present invention, is shown.

[0023] Figure 3 A longitudinal sectional side view of a composite pile anchor system for a pusher, according to an exemplary embodiment of the present invention, is shown.

[0024] Figure 4 The image shows a top plan view of a composite pile anchor system for a pusher, according to an exemplary embodiment of the present invention.

[0025] Figure label:

[0026] 1-Pipe pusher base, 2-Fixing plate, 3-Ground anchor plate, 41-Reinforcing cage, 42-Stirrups, 5-Concrete, 6-Steel pipe pile. Detailed Implementation

[0027] In the following description, a composite pile anchor system for a pipe pusher and its installation method according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] In the description of this application, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] The terms "first," "second," etc., are used merely for ease of description and distinction, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Exemplary Example 1

[0032] This exemplary embodiment provides an installation method for a composite pile anchor system for a pipe pusher.

[0033] Figure 1 A schematic flowchart illustrating an exemplary embodiment of the present invention shows an installation method for a composite pile group anchor system for a pipe pusher. Figure 2 A cross-sectional side view of a composite pile anchor system for a pusher, an exemplary embodiment of the present invention, is shown. Figure 3 A longitudinal sectional side view of a composite pile anchor system for a pusher, according to an exemplary embodiment of the present invention, is shown. Figure 4 A top plan view of a composite pile anchor system for a pusher, according to an exemplary embodiment of the present invention, is shown below. Figures 1 to 4 This description outlines the installation method of the composite pile group anchor system for the pipe pusher in this exemplary embodiment. It should be noted that the "forehead" mentioned in the specification refers to... Figure 4 Below, after the description is Figure 4 Above.

[0034] like Figure 1 As shown, the installation method of the composite pile anchor system for the pipe pusher may include the following steps: determining the installation location; excavating a shallow foundation pit; driving steel pipe piles; installing reinforcing bars; pouring concrete; installing anchor plates; and fixing the pipe pusher base.

[0035] Specifically, the installation method of the composite pile anchor system for the pipe pusher may include the following steps:

[0036] S1. Installation location determination.

[0037] Using a GPS measuring instrument, determine the installation area of ​​the ground anchor system based on the centerline direction of the pipe awaiting pullback, ensuring that the centerline of the ground anchor system coincides with the centerline of the pipe. The required footprint for the ground anchor system can be demarcated according to the dimensions of the base of different pipe pusher models. This footprint should extend approximately 1.5–2 meters forward and backward from the base, and approximately 1–1.5 meters laterally and horizontally.

[0038] S2. Excavate a shallow foundation pit.

[0039] Using a single-bucket excavator, a shallow foundation pit 1.5 to 2 meters deep is excavated in the area circled in step S1.

[0040] S3. Drive in steel pipe piles.

[0041] Using a pile driver, steel pipe piles are driven into the bottom of a shallow foundation pit, arranged in multiple rows and columns both horizontally and vertically. The pipe heads of the steel pipe piles must protrude 0.5–0.7m above the natural ground surface. During the driving process, static pressure should be used to maintain the verticality of the steel pipe piles and prevent excessive tilting. The specific distribution of the steel pipe piles needs to be determined based on the shape of the pipe-driving machine base and the shape of the ground anchor plate, ensuring that the circular holes on the ground anchor plate can pass through the steel pipe piles.

[0042] S4. Install steel reinforcement.

[0043] Two to three sets of reinforcing cages are placed around the outer perimeter of the steel pipe piles, i.e., the reinforcing cages are placed around the outer perimeter of the space formed by the steel pipe piles. Each set of reinforcing cages is divided into two layers horizontally, each layer containing two rows of main reinforcing bars (reinforcing bars) side by side. Vertically, several stirrups (hooked stirrups) fix the two layers of main reinforcing bars, with each stirrup spaced at a certain distance. This reinforcing cage can be called a double-row reinforcing cage. Here, the horizontal direction of the reinforcing cage is... Figure 1 The left and right directions, and the vertical direction are Figure 1 The up and down directions.

[0044] Here, the stirrups and main reinforcement bars can be fixed by welding, and the intersection of the main reinforcement bars can also be closed by welding.

[0045] S5. Pour concrete.

[0046] Arrange for concrete mixer trucks to pour concrete monolithically into the space within the shallow foundation pit. For example... Figure 3 As shown, the pouring height of concrete 5 can be flush with the natural ground.

[0047] S6. Install ground anchor plates.

[0048] Place the anchor plate in the designated position on the concrete, ensuring that all steel pipe piles pass vertically through the circular holes in the anchor plate.

[0049] S7, Fixed tube pusher base.

[0050] The pipe pusher is placed on the ground anchor plate, and the edge of the pipe pusher base is welded to the ground anchor plate by welding. Then the ground anchor plate and the steel pipe pile are connected and fixed.

[0051] At this point, the pipe piles (steel pipe piles), reinforced concrete (steel cage and concrete), ground anchor plate, and pipe pusher base form a large resistance system, and the installation of the composite pile group ground anchor of the pipe pusher is completed, greatly improving the strength of the ground anchor.

[0052] In this exemplary embodiment, in step S3, the distribution of the steel pipe piles may include: 3 to 4 piles arranged side by side in the front and rear transverse directions, and 1 to 2 piles arranged side by side in the left and right longitudinal directions. For example... Figure 4As shown, three steel pipe piles 6 can be arranged side by side in the front and back (horizontal direction), and two steel pipe piles 6 can be arranged side by side in the left and right (longitudinal direction).

[0053] In this exemplary embodiment, in step S3, the steel pipe pile may include a DN500 thick-walled steel pipe with a length of 6 to 9 m.

[0054] In this exemplary embodiment, 2 to 3 sets of reinforcing cages may be provided in step S4. For example... Figure 2 As shown in Figure 3, two sets of steel cages 41 are provided. Each set of double-row steel cages contains two layers in the horizontal direction. In each layer, two rows of main bars are arranged side by side in the horizontal plane. Several longitudinal stirrups in the vertical plane fix the two layers of main bars together. The spacing between the two rows of main bars can be 100-150mm.

[0055] Furthermore, the spacing between each set of double-row steel cages can be 300-500mm.

[0056] Furthermore, the double-row reinforcing cage may include a rectangular closed double-row reinforcing cage. The double-row reinforcing cage may be formed by weaving together reinforcing bars with a diameter of 12-20 mm and a type of HRB400.

[0057] In one embodiment of the present invention, the double-row steel reinforcement cages of each layer can be fixed to the pipe wall of each steel pipe pile through which they pass by spot welding.

[0058] As another embodiment of the present invention, a longitudinal support can be formed by inserting a thick steel bar into a shallow foundation pit, and then the steel cage can be spot welded onto the support.

[0059] In this exemplary embodiment, in step S4, as Figure 2 As shown in Figure 3, several stirrups 42 are spaced apart, with a spacing of 150 to 250 mm between adjacent stirrups 42.

[0060] Furthermore, the hook stirrups may be made of steel bars with a diameter of 8 to 10 mm and a type of HPB300.

[0061] In this exemplary embodiment, in step S7, as Figure 4 As shown, the pipe pusher sits on the ground anchor plate, and the center lines of the pipe pusher base 1 and the ground anchor plate 3 are aligned.

[0062] In this exemplary embodiment, in step S7, as Figure 3 As shown in Figure 4, the ground anchor plate 3 and the steel pipe pile 6 can be fixed by welding with fixing plate 2, which may include triangular steel plate.

[0063] Exemplary Example 2

[0064] This exemplary embodiment provides a composite pile anchoring system for a pipe pusher. This composite pile anchoring system for a pipe pusher can be formed using the installation method for the composite pile anchoring system for a pipe pusher described in Exemplary Embodiment 1 above.

[0065] like Figures 2-4 As shown, the composite pile anchor system of the pipe pusher may include steel pipe piles 6, steel cages 41, stirrups 42, concrete 5, anchor plates 3, and pipe pusher base 1.

[0066] In this structure, multiple rows and columns of steel pipe piles 6 are installed in the shallow foundation pit, with the pipe heads of the piles protruding from the natural ground surface. Multiple sets of reinforcing cages 41 are located within the shallow foundation pit, positioned around the periphery of the space formed by the steel pipe piles 6. Several spaced stirrups 42 are fixedly connected to the periphery of each set of reinforcing cages. The shallow foundation pit is filled with concrete 5, forming a reinforced concrete structure. Ground anchor plates 3 are located on the concrete 5, and the steel pipe piles 6 all pass through holes in the ground anchor plates 3. A pipe pusher sits on the ground anchor plates 3, with their center lines aligned. The edge of the pipe pusher base 1 is welded and fixed to the ground anchor plates 3. The ground anchor plates 3 and the steel pipe piles 6 are welded and fixed together using fixing plates 2.

[0067] In this exemplary embodiment, the shallow foundation pit may extend 1.5 to 2.5 meters beyond the front-to-back direction of the pipe pusher base and 1 to 1.5 meters beyond the left-to-right direction of the pipe pusher base. The shallow foundation pit may be 1.5 to 2 meters deep.

[0068] In this exemplary embodiment, the distribution of steel pipe piles may include: 3 to 4 piles arranged side by side in the front and rear transverse directions, for example, 3 piles; and 1 to 2 piles arranged side by side in the left and right longitudinal directions, for example, 2 piles.

[0069] In this exemplary embodiment, the reinforcing cage can be arranged in 2 to 3 layers, and the spacing between each group of double-row reinforcing cages can be 300 to 500 mm, for example, 350 mm, 400 mm, or 500 mm. The reinforcing cage can include a rectangular closed double-row reinforcing cage. Each group of double-row reinforcing cages can have two rows of main bars in both the horizontal and vertical directions, and the spacing between every two rows of main bars in the same direction can be 100 to 150 mm, for example, 100 mm, 120 mm, or 150 mm.

[0070] In this exemplary embodiment, the stirrups may be hook stirrups, and the spacing between two adjacent hook stirrups may be 150-250mm, such as 160mm, 200mm, or 240mm.

[0071] In this exemplary embodiment, the double-row steel reinforcement cage can be set on the outer periphery of the steel pipe pile forming space and spot-welded to the steel pipe pile, or a longitudinal support (formed by thick steel bars) can be set in the shallow foundation pit, and the double-row steel reinforcement cage can be spot-welded to the longitudinal support and located on the outer periphery of the steel pipe pile forming space.

[0072] In this exemplary embodiment, the steel pipe pile may include a DN500 thick-walled steel pipe with a length of 6-9m. The double-row reinforcing cage may be formed by braiding steel bars of HRB400 with a diameter of 12-20mm. The hook stirrups may be formed by steel bars of HPB300 with a diameter of 8-10mm. The fixing plate includes a triangular steel plate.

[0073] The composite pile anchor system for the pipe pusher in this exemplary embodiment can meet the thrust requirements when pushing large-diameter, long-distance pipelines. A comparison with traditional conventional anchors in terms of cost and horizontal load is as follows:

[0074]

[0075] In summary, the advantages proposed by this invention include at least one of the following:

[0076] (1) The composite pile anchor system of the pusher proposed in this invention has a reasonable structure, high bearing capacity and high horizontal resistance.

[0077] (2) Compared with the conventional method of driving multiple simple steel pipes directly into the ground to construct a ground anchor system, the installation method of the composite pile group ground anchor system of the pipe pusher proposed in this invention can complete the construction of the ground anchor system of the pipe pusher in a low-cost, fast and convenient manner.

[0078] (3) The strength of the composite pile anchor system for the pipe pusher proposed in this invention is significantly improved compared with the anchor system formed by the traditional method. After on-site verification, the pipe pusher anchor system installed by the installation method of this invention can meet the thrust requirements when pushing large-diameter long-distance pipes.

[0079] Although the present invention has been described above with reference to exemplary embodiments, a composite pile anchor system for a pipe pusher and its installation method have been described above, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. An installation method for a composite pile group anchor system for a pipe pusher, characterized in that, The installation method includes: Excavate shallow foundation pits; Steel pipe piles are driven into the bottom of shallow foundation pits. The steel pipe piles are distributed in multiple rows and columns, and the pipe heads of the steel pipe piles protrude from the natural ground surface. Multiple sets of reinforcing cages are placed around the outer periphery of the space formed by the steel pipe piles, and several stirrups are placed at intervals around the outer periphery of each set of reinforcing cages. Pour concrete into the shallow foundation pit; The ground anchor plate is placed on the concrete so that the steel pipe piles all pass through the holes in the ground anchor plate; Place the pipe pusher on the ground anchor plate, align the center lines of the two, weld the edge of the pipe pusher base to the ground anchor plate, and then fix the ground anchor plate and the steel pipe pile by welding with fixing plates. The steel pipe piles, reinforcing cage, concrete, ground anchor plate, and pipe pusher base form a resistance system, and the installation of the composite pile ground anchor of the pipe pusher is completed.

2. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The steel pipe piles are distributed as follows: 3 to 4 piles are arranged horizontally in front and behind, and 1 to 2 piles are arranged vertically in the left and right.

3. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The steel reinforcement cage is provided in 2 to 3 groups, with a spacing of 300 to 500 mm between each group of steel reinforcement cages; the spacing between two adjacent stirrups is 150 to 250 mm.

4. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The reinforcing cage is set on the outer periphery of the space formed by the steel pipe pile and welded to the steel pipe pile; a longitudinal support is also set in the shallow foundation pit, and the reinforcing cage is spot-welded to the longitudinal support and located on the outer periphery of the space formed by the steel pipe pile.

5. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The reinforcing cage is formed by weaving steel bars with a diameter of 12-20mm and model HRB400; the reinforcing cage includes a rectangular closed double-row reinforcing cage, the double-row reinforcing cage includes two rows of main bars arranged in the horizontal direction and two rows of main bars in the vertical direction, the spacing between the two rows of main bars in the same direction is 100-150mm; the stirrups include hook stirrups, the stirrups are made of steel bars with a diameter of 8-10mm and model HPB300.

6. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The steel pipe pile comprises a DN500 thick-walled steel pipe, which is 6 to 9 m long; the pipe head of the steel pipe pile protrudes 0.5 to 0.7 m above the natural ground surface.

7. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The installation method further includes: determining the location of the shallow foundation pit before excavation, the determination including: using a GPS measuring instrument to determine the range of the location based on the centerline direction of the pipeline waiting to be pulled back, ensuring that the centerline of the composite pile anchor system of the pipe pusher coincides with the centerline of the pipeline.

8. The installation method of the composite pile group anchor system for the pipe pusher according to claim 7, characterized in that, The shallow foundation pit extends 1.5 to 2.5 meters beyond the front-to-back direction of the pipe pusher base and 1 to 1.5 meters beyond the left-to-right direction of the pipe pusher base; the shallow foundation pit is 1.5 to 2 meters deep.

9. The installation method of the composite pile anchor system for the pipe pusher according to claim 1, characterized in that, The fixing plate includes a triangular steel plate.

10. A composite pile group anchor system for a pipe pusher, characterized in that, The composite pile anchor system for the pipe pusher is formed by the installation method of the composite pile anchor system for the pipe pusher as described in any one of claims 1 to 9. The composite pile anchor system for the pipe pusher is located in a shallow foundation pit and includes steel pipe piles, a reinforcing cage, stirrups, concrete, anchor plates, and a pipe pusher base. Multiple rows of steel pipe piles are installed in the shallow foundation pit, with the pipe heads exposed on the natural ground surface. Multiple sets of reinforcing cages are installed in the shallow foundation pit, and the reinforcing cages are set on the outer periphery of the space formed by the steel pipe piles. Several stirrups are fixedly connected to the outer periphery of each set of reinforcing cages at intervals. The shallow foundation pit is filled with concrete, and the ground anchor plate is located on the concrete. All steel pipe piles pass through the holes in the ground anchor plate. The pipe pusher is set on the ground anchor plate, and the center lines of the two are aligned. The edge of the pipe pusher base is fixed to the ground anchor plate, and the ground anchor plate and steel pipe piles are fixed by fixing plates.

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