Large-diameter pipe jacking construction receiving well reinforcing structure and construction method

Abstract

The invention discloses a large-diameter pipe-jacking construction receiving well reinforcing structure and a construction method, and relates to the field of pipe-jacking construction technology.The large-diameter pipe-jacking construction receiving well reinforcing structure comprises a cement pile reinforcing area arranged outside a tunnel portal of a receiving well and a tunnel portal blocking structure used for blocking the tunnel portal of the receiving well; the cement pile reinforcing area is provided with a plurality of cement reinforcing piles arranged in a square matrix mode, the upper ends of the cement reinforcing piles are higher than the tunnel portal blocking structure, and the lower ends of the cement reinforcing piles are lower than the tunnel portal blocking structure. The problems of tunnel portal collapse and pipeline sinking during receiving of the large-diameter pipe jacking machine can be reduced.

Description

Technical Field

[0001] The present application relates to the field of pipe jacking construction technology, and in particular to a large-diameter pipe jacking construction receiving well reinforcement structure and construction method. Background Art

[0002] Pipe jacking construction is a trenchless construction method and a pipeline burial construction technology that requires no excavation or minimal excavation. Pipe jacking construction is to push the pipeline into the soil with the help of the jacking force generated by the jacking equipment in the working pit. After one section of pipe is pushed into the soil, the second section of pipe is lowered to continue jacking. The principle is to use the thrust of the main jacking cylinder and the pipeline room, relay room, etc. to push the tool pipe or tunnel boring machine from the working pit through the soil layer to the receiving pit and lift it. The pipeline follows the tool pipe or tunnel boring machine and is buried between the two pits. The reception of the pipe jacking machine is a key link in the pipe jacking construction of water conservancy projects. In the construction of large-diameter pipe jacking, technical problems such as tunnel collapse and pipeline sinking are prone to occur when the large-diameter pipe jacking machine is receiving it. Summary of the Invention

[0003] In order to reduce the problems of tunnel collapse and pipe sinking when a large-diameter pipe jacking machine is receiving the pipe, the present application provides a large-diameter pipe jacking construction receiving well reinforcement structure and construction method.

[0004] The present application provides a large-diameter pipe jacking construction receiving well reinforcement structure and construction method using the following technical solutions: A large-diameter jacking pipe construction receiving well reinforcement structure includes a cement pile reinforcement area arranged outside the receiving well's tunnel portal and a tunnel portal blocking structure for blocking the receiving well's tunnel portal. The cement pile reinforcement area has a plurality of cement reinforcement piles arranged in a square array. The upper ends of the cement reinforcement piles are higher than the tunnel portal blocking structure, and the lower ends are lower than the tunnel portal blocking structure.

[0005] By adopting the above technical solution, high-pressure cement reinforcement piles are used to reinforce the soil outside the receiving well portal, which can reduce the problems of portal collapse and pipeline sinking when receiving large-diameter pipe jacking machines. The receiving well portal is sealed with a portal sealing structure, which can keep the soil outside the portal stable during the cement reinforcement pile construction and pipe jacking construction process, thereby reducing the problems of portal collapse and pipeline sinking when receiving large-diameter pipe jacking machines.

[0006] Optionally, the center height of the portal sealing structure is consistent with the center height of the cement reinforcement pile.

[0007] By adopting the above technical solution, the center height of the cement reinforcement pile is consistent with the height of the center line of the portal sealing structure, so that the upper and lower ends of the cement reinforcement pile are symmetrical about the center of the portal of the receiving well. Under the premise of meeting the reinforcement needs of the soil outside the portal of the receiving well, the construction height requirement of the cement reinforcement pile can be reduced, which is beneficial to saving materials and construction time; on the other hand, the upper and lower ends of the cement reinforcement pile are symmetrical about the center of the portal of the receiving well, so that the reinforcement effect of the cement reinforcement pile on the portal is more balanced, so that when the jacking pipe cuts into the inner side of the portal, the portal is subjected to more balanced force, which is beneficial to protecting the portal structure of the receiving well.

[0008] Optionally, a plurality of limiting steel bars are provided at the bottom of the cement pile reinforcement area, the limiting steel bars are parallel to the center line of the portal sealing structure, and the limiting steel bars are partially wrapped around the lower end of the cement reinforcement pile.

[0009] By adopting this technical solution, as the cement piles are being drilled downward, the limiting steel bars serve as a limiting structure for the drilling rig, allowing for control of the drilled hole depth and, consequently, the height of each cement pile. Once the slurry in the cement piles solidifies, the lower end of the piles wraps around the limiting steel bars, connecting the piles and the limiting steel bars together. The limiting steel bars strengthen the connection between the piles and the soil, reducing settlement of the piles.

[0010] Optionally, one end of each of the limiting steel bars close to the portal sealing structure is welded to a first connecting steel bar.

[0011] By adopting the above technical solution, each limiting steel bar is connected into a whole through the first connecting steel bar, so that each cement reinforcement pile is indirectly connected into a whole through the limiting steel bar and the first connecting steel bar, so that the integrity of the cement pile reinforcement area is improved, and the reinforcement effect of the cement pile reinforcement area on the soil is enhanced.

[0012] Optionally, a plurality of reinforcing steel bars are provided on the top of the cement pile reinforcement area, and the reinforcing steel bars are located between the upper end of the cement reinforcement pile and the portal sealing structure. The reinforcing steel bars are parallel to the limiting steel bars, and each of the reinforcing steel bars is located between two adjacent rows of cement reinforcement piles. Each of the reinforcing steel bars is connected to a second connecting steel bar at one end close to the portal sealing structure, and a plurality of vertical connecting steel bars are welded to the second connecting steel bar and the first connecting steel bar.

[0013] By adopting the above technical solution, the reinforcing steel bars and the cement reinforcement piles are staggered in the horizontal direction, so that the reinforcing steel bars will not hinder the construction of the cement reinforcement piles; the reinforcing steel bars are higher than the tunnel gate blocking structure, so that the reinforcing steel bars will not hinder the jacking construction of the jacking pipe. After the cement reinforcement piles are constructed, part of the slurry of the cement reinforcement piles penetrates into the soil and wraps around the reinforcing steel bars, so that the connection between the upper end of the cement reinforcement piles and the soil is strengthened. Furthermore, the reinforcing steel bars are connected by a second connecting steel bar, and the second connecting steel bar is connected to the first connecting steel bar by a vertical steel bar, so that the different steel bars are connected to form an overall frame structure, so that the reinforcing effect of the steel bars on the cement reinforcement piles is enhanced.

[0014] Optionally, the portal sealing structure is provided with a sealing ring, which is pre-embedded in the inner circumference of the portal of the receiving well. The sealing ring is used to seal the joint between the portal sealing structure and the portal, and can be used to abut the outer circumference of the top pipe.

[0015] By adopting the above technical solution, a sealing ring is used to seal the tunnel portal sealing structure and the tunnel portal, ensuring a high degree of sealing. The sealing ring reduces the contact area between the tunnel portal sealing structure and the inner circumference of the tunnel portal, making it less likely to damage the inner wall of the tunnel portal during the removal of the tunnel portal sealing structure. Furthermore, the sealing ring is pre-embedded in the inner circumference of the tunnel portal. When the jacking pipe is inserted into the tunnel portal, the sealing ring can seal the gap between the jacking pipe and the tunnel portal, reducing the amount of mud and water that seeps into the receiving well during the jacking process.

[0016] Optionally, the tunnel door blocking structure includes a concrete structure body, a metal ring is embedded in the peripheral edge of the concrete structure body, and the metal ring is sealed with the sealing ring.

[0017] By adopting this technical solution, during the construction of the portal sealing structure, a metal ring is first installed inside the sealing ring, and then concrete is poured using a formwork to form the main concrete structure. The metal ring abuts the sealing ring, which can enhance the sealing effect between the portal sealing structure and the sealing ring and reduce damage to the sealing ring when the portal sealing structure is removed.

[0018] Optionally, the outer peripheral surface of the tunnel gate sealing structure has a taper, and the large end of the tunnel gate sealing structure faces the cement pile reinforcement area.

[0019] By adopting this technical solution, the tunnel portal sealing structure is tapered, with its larger end facing the cement pile reinforcement area, allowing the structure to be locked within the tunnel portal, making the connection between the structure and the portal more stable and reliable. Once the pipe jacking machine is received, the ring beam is cast to permanently seal the gap around the tunnel, making the cast ring beam structure more stable and reliable.

[0020] Optionally, the metal ring is provided with a fracture, and the metal ring has two ends, and the gap between the two ends of the metal ring serves as the fracture; an adjustment component is connected between the two ends of the metal ring, and the adjustment component includes a bolt, a threaded connection seat and a rotating connection seat, the bolt is threadedly connected to the threaded connection seat and is rotatably connected to the rotating connection seat, the rotating connection seat is fixedly connected to one of the ends of the metal ring, and the threaded connection seat is fixedly connected to the other end of the metal ring; a separator is provided at the fracture of the metal ring, and the separator is used to separate the metal ring and the sealing ring.

[0021] By adopting the above technical solution, when the bolt of the adjustment assembly is rotated, the threaded connection seat and the rotating connection seat can be moved closer to or further away from each other, thereby adjusting the circumference of the metal ring. When installing the metal ring on the inner side of the sealing ring, the metal ring is first adjusted inward to facilitate installation within the sealing ring. Once the metal ring is installed in place, the metal ring is adjusted outward to radially squeeze the sealing ring, thereby strengthening the sealing performance between the metal ring and the inner circumference of the tunnel door. A separator is provided at the fracture of the metal ring to separate the concrete at the fracture of the metal ring to protect the sealing ring.

[0022] A construction method for a large-diameter jacking pipe construction receiving well reinforcement structure comprises the following steps: opening a well pit for an external receiving well and placing the receiving well caisson in place; constructing a tunnel door sealing structure; constructing cement reinforcement piles; coring and testing; chiseling away the tunnel door sealing structure; receiving a jacking pipe head; and sealing gaps in the receiving well tunnel.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Using high-pressure cement reinforcement piles to reinforce the soil outside the receiving well portal can reduce portal collapse and pipeline sinking problems when receiving with a large-diameter pipe jacking machine. The receiving well portal is sealed with a portal sealing structure, which can keep the soil outside the portal stable during the cement reinforcement pile construction and pipe jacking construction process, thereby reducing portal collapse and pipeline sinking problems when receiving with a large-diameter pipe jacking machine.

[0024] 2. The upper and lower ends of the cement reinforcement piles are symmetrical about the center of the receiving well portal, so that the cement reinforcement piles have a more balanced reinforcement effect on the portal. Therefore, when the jacking pipe cuts into the inner side of the portal, the portal is subjected to a more balanced force, which is beneficial to protecting the portal structure of the receiving well. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the large-diameter jacking pipe construction receiving well reinforcement structure of Example 1.

[0026] Figure 2It is a cross-sectional view of the large-diameter jacking pipe construction receiving well reinforcement structure of Example 1.

[0027] Figure 3 This is a schematic diagram of Example 1 used to illustrate the connection relationship between the limiting steel bars and the reinforcing steel bars.

[0028] Figure 4 This is a flow chart of a construction method for a large-diameter pipe jacking construction receiving well reinforcement structure in Example 1.

[0029] Figure 5 It is a cross-sectional view of the large-diameter jacking pipe construction receiving well reinforcement structure of Example 2.

[0030] Figure 6 This is a schematic diagram of Example 2 used to illustrate the matching relationship between the metal ring and the sealing ring.

[0031] Description of reference numerals: 1. Receiving shaft; 11. Tunnel portal; 2. Cement pile reinforcement area; 21. Cement reinforcement pile; 22. Limiting steel bar; 23. Reinforcement steel bar; 24. First connecting steel bar; 25. Second connecting steel bar; 26. Vertical connecting steel bar; 3. Tunnel portal sealing structure; 31. Concrete structure body; 32. Metal ring; 321. Bottom plate; 322. Side plate; 33. Fracture; 34. Adjustment assembly; 341. Bolt; 342. Threaded connector; 343. Rotating connector; 344. Retaining spring; 35. Separator; 4. Dewatering well; 5. Sealing ring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-6 This application is described in further detail.

[0033] Example 1 The present application discloses a large diameter pipe jacking construction receiving well reinforcement structure and construction method. Figure 1 and Figure 2 The large-diameter jacking construction receiving well reinforcement structure includes a cement pile reinforcement area 2 arranged outside the tunnel portal 11 of the receiving well 1 and a tunnel portal blocking structure 3 for blocking the tunnel portal 11 of the receiving well 1; the cement pile reinforcement area 2 has a plurality of cement reinforcement piles 21 arranged in a square array. In this embodiment, the cement reinforcement piles 21 are high-pressure rotary jet piles. In another embodiment, they can be replaced with mixing piles. The horizontal direction of the square array of cement reinforcement piles 21 is parallel to the center line direction of the tunnel portal blocking structure 3, and the longitudinal direction of the square array of cement reinforcement piles 21 is perpendicular to the center line direction of the tunnel portal blocking structure 3. The upper end of the cement reinforcement pile 21 is higher than the tunnel portal blocking structure 3, and the lower end is lower than the tunnel portal blocking structure 3; precipitation wells 4 are respectively provided on both sides of the cement pile reinforcement area 2.

[0034] Reference Figure 2The center height of the cement reinforcement pile 21 is consistent with the center height of the portal sealing structure 3. That is, the upper and lower ends of the cement reinforcement pile 21 are symmetrical about the center line of the portal 11. There is a height difference between the upper end of the cement reinforcement pile 21 and the ground. The bottom hole between the top of the cement reinforcement pile 21 and the ground is filled with cement or backfill soil. If the hole diameter of the high-pressure jet grouting pile is small, it is not necessary to backfill the bottom hole at the upper end of the jet grouting pile.

[0035] Reference Figure 2 and Figure 3 The cement pile reinforcement area 2 is provided with a plurality of limiting steel bars 22 and a plurality of reinforcing steel bars 23. The limiting steel bars 22 are located at the bottom of the cement pile reinforcement area 2, and the connecting steel bars are located at the top of the cement pile reinforcement area 2. The limiting steel bars 22 and the reinforcing steel bars 23 are parallel to the centerline of the portal sealing structure 3. The limiting steel bars 22 and the reinforcing steel bars 23 are inserted from the pit wall outside the receiving shaft 1 into the soil of the cement pile reinforcement area 2.

[0036] Each limiting steel bar 22 passes through the bottom of the cement reinforcement pile 21 arranged in the transverse direction, and the bottom of the cement reinforcement pile 21 wraps the limiting steel bar 22. Each reinforcing steel bar 23 is located between two longitudinally adjacent rows of cement reinforcement piles 21. The cement slurry of the cement reinforcement pile 21 penetrates and combines with the reinforcing steel bar 23; each limiting steel bar 22 is welded to a first connecting steel bar 24 at one end close to the tunnel portal blocking structure 3, and each reinforcing steel bar 23 is welded to a second connecting steel bar 25 at one end close to the tunnel portal blocking structure 3, and a number of vertical connecting steel bars 26 are welded to the second connecting steel bar 25 and the first connecting steel bar 24.

[0037] After the slurry in the cement reinforcement pile 21 solidifies, the lower end of the cement reinforcement pile 21 wraps around the limiting steel bars 22. A portion of the slurry in the cement reinforcement pile 21 seeps into the soil and wraps around the reinforcing steel bars 23. The limiting steel bars 22 are connected by first connecting steel bars 24, and the reinforcing steel bars 23 are connected to each other by second connecting steel bars 25. The second connecting steel bars 25 are connected to the first connecting steel bars 24 by vertical steel bars. This interconnects the various steel bars into a single, integrated framework, enhancing the bond strength between the cement reinforcement pile 21 and the soil.

[0038] The large-diameter pipe jacking construction receiving well reinforcement structure of the embodiment of the present application uses high-pressure cement reinforcement piles 21 to reinforce the soil outside the tunnel 11 of the receiving well 1, which can reduce the problem of tunnel 11 collapse and pipe sinking when the large-diameter pipe jacking machine is receiving the tunnel. The tunnel 11 of the receiving well 1 is sealed using the tunnel sealing structure 3, which can keep the soil outside the tunnel 11 stable during the construction of the cement reinforcement piles 21 and the pipe jacking construction. During the process of breaking the tunnel 11 and receiving the pipe jacking machine, if water or soil leakage occurs, emergency dewatering is carried out using the dewatering well 4, and the dewatering depth is 1m below the bottom of the pipe.

[0039] This embodiment discloses a construction method for a large diameter pipe jacking construction receiving well reinforcement structure, referring to Figure 4 , including the following steps: Step 1: excavate a pit for the receiving well 1 and caisson the receiving well 1 in place; before caissoning the receiving well 1, insert a limiting steel bar 22 and a reinforcing steel bar 23 on the pipe side of the pit, and weld a first connecting steel bar 24, a second connecting steel bar 25 and a vertical connecting steel bar 26; Step 2: constructing the tunnel portal blocking structure 3; the tunnel portal blocking structure 3 is formed by setting up a formwork on the inner side of the receiving shaft 1 and then pouring concrete, or by using a masonry method; Step 3: construct cement reinforcement piles 21, which are high-pressure jet grouting piles in this embodiment; excavate dewatering wells 4 on both sides of the cement pile reinforcement area 2; Step 4: After the cement reinforced pile 21 reaches the age, core samples are taken for testing; Step 5: After all parameters of the core sample meet the requirements and pass the inspection, the tunnel door blocking structure 3 is chiseled out according to the jacking progress; Step 6: Receive the pipe jacking machine head. Usually, the time from the machine head entering the stratum reinforcement area to the machine tail leaving the well wall is the standard. When the pipe jacking machine is received, the tunnel ring gap between the tunnel portal 11 and the pipe jacking machine and the pipe section is the main channel for soil and water loss. Therefore, after the tunnel portal plugging structure 3 is chiseled out, the mud and water tank pressure is reduced, and the pipe jacking machine cuts into the tunnel portal 11 at the fastest speed. After the pipe jacking machine head extends out of the tunnel portal 11, the gap between the pipe jacking machine and the tunnel ring is temporarily blocked with an annular steel plate. Step 7: After the pipe jacking machine has completely passed through the tunnel gate 11, a ring beam is cast to permanently seal the gap in the tunnel ring.

[0040] Example 2 Reference Figure 5 The difference between this embodiment and embodiment 1 is that the tunnel portal blocking structure 3 includes a concrete structure body 31, the outer peripheral surface of the concrete structure body 31 is sealed with the inner peripheral surface of the tunnel portal 11, the outer peripheral surface of the concrete structure body 31 has a taper, the taper slope of the concrete structure body 31 is 5~10°, and the large end of the concrete structure body 31 faces the cement pile reinforcement area 2.

[0041] Reference Figure 5 The tunnel portal sealing structure 3 is provided with a sealing ring 5, which is pre-cast and embedded in the inner circumference of the tunnel portal 11 of the receiving shaft 1, with a portion of the sealing ring 5 exposed inside the inner space of the tunnel portal 11. The sealing ring 5 is used to seal the joint between the tunnel portal sealing structure 3 and the tunnel portal 11, and can be used to abut the outer circumference of the jacking pipe.

[0042] Reference Figure 5 and Figure 6 A metal ring 32 is embedded in the peripheral edge of the concrete structure body 31 , and the metal ring 32 is sealed with the sealing ring 5 .

[0043] Reference Figure 6 The metal ring 32 includes a bottom plate 321 and side plates 322 located on both sides of the bottom plate 321. The bottom plate 321 and the side plates 322 can be connected by welding or formed by integral bending. The bottom plate 321 and the two side plates 322 form a groove structure, and the groove of the metal ring 32 is away from the center of the metal ring 32.

[0044] Reference Figure 6 The metal ring 32 is provided with a fracture 33. The metal ring 32 has two ends. The gap between the two ends of the metal ring 32 serves as the fracture 33. An adjustment component 34 is connected between the two ends of the metal ring 32. The adjustment component 34 is located on the inner side of the metal ring 32. The adjustment component 34 includes a bolt 341, a threaded connection seat 342 and a rotating connection seat 343. The bolt 341 is threadedly connected to the threaded connection seat 342 and is connected to the rotating connection seat 343. The bolt 341 has two The bolt 341 is clamped by two retaining springs 344 through the retaining spring 344 groove. The two retaining springs 344 are respectively located on both sides of the rotating connecting seat 343, so that the bolt 341 and the rotating connecting seat 343 form a rotating connection; the rotating connecting seat 343 is fixedly connected to one end of the metal ring 32, and the threaded connecting seat 342 is fixedly connected to the other end of the metal ring 32. The rotating connecting seat 343 and the threaded connecting seat 342 are arranged on the bottom plate 321 of the metal ring 32.

[0045] A separator 35 is provided at the fracture 33 of the metal ring 32 . The separator 35 is used to separate the metal ring 32 from the sealing ring 5 . The separator 35 can be a thin metal sheet or a tough plastic film. The cross-sectional shape of the separator 35 is the same as that of the metal ring 32 , and the thickness of the separator 35 is less than the thickness of the bottom plate 321 and the side plates 322 of the metal ring 32 .

[0046] In this embodiment, the sealing ring 5 is used to seal between the tunnel portal sealing structure 3 and the tunnel portal 11, ensuring a high degree of sealing. The sealing ring 5 reduces the contact area between the tunnel portal sealing structure 3 and the inner circumference of the tunnel portal 11, making it less likely to damage the inner wall of the tunnel portal 11 during the removal of the tunnel portal sealing structure 3. Furthermore, the sealing ring 5 is pre-embedded in the inner circumference of the tunnel portal 11. When the jacking pipe is inserted into the tunnel portal 11, the sealing ring 5 can seal the gap between the jacking pipe and the tunnel portal 11, thereby reducing the amount of mud and water that seeps into the receiving shaft 1 during the jacking process.

[0047] Before the construction of the tunnel portal sealing structure 3 of this embodiment, the sealing ring 5 is pre-buried in the tunnel portal 11 of the receiving shaft 1 in step 1. After the receiving shaft 1 is caissoned and in place, the tunnel portal sealing structure 3 is constructed. During this process, the metal ring 32 is first installed on the inner side of the sealing ring 5. When installing the metal ring 32, the metal ring 32 is first adjusted inward to facilitate installation into the sealing ring 5. After the metal ring 32 is installed in place, the metal ring 32 is adjusted outward to radially press the sealing ring 5, thereby strengthening the sealing performance of the sealing ring 5 between the metal ring 32 and the inner circumferential surface of the tunnel portal 11. During the installation of the metal ring 32, a separator 35 is provided at the fracture 33 of the metal ring 32.

[0048] After the metal arc is installed, a formwork is installed inside the receiving shaft 1, forming a closed space with the tunnel portal 11. Concrete is then poured, and after the concrete solidifies, it seals the tunnel portal 11. The formwork used to cast the tunnel portal sealing structure 3 is assembled in upper and lower sections to facilitate concrete pouring. In alternative embodiments, the main concrete structure 31 can also be constructed using masonry.

[0049] In this embodiment, the gap between the pipe jacking machine and the door opening is sealed by the sealing ring 5, and the gap between the pipe jacking machine and the door ring does not need to be temporarily sealed by an annular steel plate.

[0050] In addition, in this embodiment, when the ring beam is cast on the tunnel ring, the sealing ring 5 can be removed and the cement material used for casting the ring beam can be used to fill the space originally occupied by the sealing ring 5 on the inner peripheral surface of the tunnel door.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large-diameter pipe jacking construction receiving well reinforcement structure, characterized by: The invention comprises a cement pile reinforcement area (2) arranged outside a tunnel door (11) of a receiving well (1) and a tunnel door blocking structure (3) for blocking the tunnel door (11) of the receiving well (1), wherein the cement pile reinforcement area (2) has a plurality of cement reinforcement piles (21) arranged in a square array, and the upper ends of the cement reinforcement piles (21) are higher than the tunnel door blocking structure (3), and the lower ends of the cement reinforcement piles (21) are lower than the tunnel door blocking structure (3).

2. A large-diameter pipe jacking construction receiving well reinforcement structure according to claim 1, characterized in that: The center height of the tunnel gate blocking structure (3) is consistent with the center height of the cement reinforcement pile (21).

3. The large-diameter pipe jacking construction receiving well reinforcement structure according to claim 1, characterized in that: A plurality of limiting steel bars (22) are provided at the bottom of the cement pile reinforcement area (2), the limiting steel bars (22) are parallel to the center line of the tunnel gate blocking structure (3), and the limiting steel bars (22) are partially wrapped around the lower end of the cement reinforcement pile (21).

4. A large-diameter pipe jacking construction receiving well reinforcement structure according to claim 3, characterized in that: One end of each of the limiting steel bars (22) close to the tunnel door blocking structure (3) is welded to a first connecting steel bar (24).

5. A large-diameter pipe jacking construction receiving well reinforcement structure according to claim 4, characterized in that: A plurality of reinforcing steel bars (23) are provided on the top of the cement pile reinforcement area (2), the reinforcing steel bars (23) are located between the upper end of the cement reinforcement pile (21) and the tunnel gate blocking structure (3), the reinforcing steel bars (23) are parallel to the limiting steel bars (22), and each of the reinforcing steel bars (23) is located between two adjacent rows of the cement reinforcement piles (21), and one end of each reinforcing steel bar (23) close to the tunnel gate blocking structure (3) is connected to a second connecting steel bar (25), and a plurality of vertical connecting steel bars (26) are welded between the second connecting steel bar (25) and the first connecting steel bar (24).

6. The large-diameter pipe jacking construction receiving well reinforcement structure according to claim 1, characterized in that: The tunnel door sealing structure (3) is provided with a sealing ring (5), and the sealing ring (5) is pre-buried in the inner peripheral surface of the tunnel door (11) of the receiving well (1). The sealing ring (5) is used to seal the joint between the tunnel door sealing structure (3) and the tunnel door (11), and can be used to abut the outer peripheral surface of the top pipe.

7. A large-diameter pipe jacking construction receiving well reinforcement structure according to claim 6, characterized in that: The tunnel door blocking structure (3) comprises a concrete structure body (31), a metal ring (32) is embedded in the peripheral edge of the concrete structure body (31), and the metal ring (32) is in sealing cooperation with the sealing ring (5).

8. The large-diameter pipe jacking construction receiving well reinforcement structure according to claim 7, characterized in that: The outer peripheral surface of the tunnel door sealing structure (3) has a taper, and the large end of the tunnel door sealing structure (3) faces the cement pile reinforcement area (2).

9. A large-diameter pipe jacking construction receiving well reinforcement structure according to claim 8, characterized in that: The metal ring (32) is provided with a fracture (33), and the metal ring (32) has two ends, and the gap between the two ends of the metal ring (32) serves as the fracture (33); an adjustment component (34) is connected between the two ends of the metal ring (32), and the adjustment component (34) comprises a bolt (341), a threaded connection seat (342) and a rotating connection seat (343), the bolt (341) is threadedly connected to the threaded connection seat (342) and is rotatably connected to the rotating connection seat (343), the rotating connection seat (343) is fixedly connected to one end of the metal ring (32), and the threaded connection seat (342) is fixedly connected to the other end of the metal ring (32); a separator (35) is provided at the fracture (33) of the metal ring (32), and the separator (35) is used to separate the metal ring (32) and the sealing ring (5).

10. A construction method for a large-diameter pipe jacking construction receiving shaft reinforcement structure according to any one of claims 1 to 9, characterized in that: The steps include: Opening a pit for the external receiving well (1) and caissoning the receiving well (1) into place; Construction of tunnel gate sealing structure (3); Construction of cement reinforcement piles (21); Coring testing; Chisel away the tunnel entrance blocking structure (3); Receiving pipe jacking machine head; Seal the gap in the receiving well (1) ring.

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