Vibration reduction foundation of underground station and construction method of vibration reduction foundation

Abstract

The invention discloses an underground station vibration reduction foundation and a construction method thereof, and relates to the technical field of tunnel vibration reduction construction. Comprising a tunnel segment, a steel pipe pile and a counter-force mechanism, a pile pressing hole is formed in the bottom of the tunnel segment, the steel pipe pile is suitable for being installed and penetrating through the pile pressing hole, the bottom of the steel pipe pile extends to the lower end to enter a stratum below the bottom of the tunnel segment, and the upper end of the steel pipe pile is connected into the tunnel segment and connected with the counter-force mechanism; the counter-force mechanism is suitable for pressing the steel pipe pile into the stratum below the tunnel. The counter-force mechanism comprises an anchor rod, a counter-force steel framework and a jack, the anchor rod is installed in the tunnel segment, the top of the steel pipe pile is connected with the jack, and the counter-force steel framework is installed on a ballast bed of the tunnel segment; an electric hoist is mounted at the top of the jack, and the output end of the electric hoist is suitable for being connected with the jack; anchor rods are mounted on the two sides of the steel pipe pile; the anchor rod is suitable for being inserted into a ballast bed and a tunnel segment. The technical problem of how to improve the vibration reduction performance of the subway tunnel is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel vibration reduction construction, and in particular to an underground station vibration reduction foundation and a construction method thereof. Background Art

[0002] With the continuous expansion and development of cities, the urban area is expanding, and the population is growing. Many cities are facing the prominent contradiction between the lagging infrastructure development and the surge in citizens' travel needs. In order to effectively alleviate this contradiction, many cities have chosen to vigorously promote the construction and development of rail transit. However, although rail transit has played a positive role in alleviating ground traffic congestion, the vibration and noise problems generated during its operation have also had an unignorable impact on the quality of life of urban residents. Especially in large cross-transfer underground stations, due to factors such as high frequency of train operation and high passenger flow, vibration and noise problems are particularly prominent, causing significant adverse effects on the surrounding environment and residents' lives.

[0003] In addition, when a shield tunnel passes through a soft soil layer or an area with large geological fluctuations, it is particularly difficult to control its post-construction settlement due to the flexible structural characteristics of the shield tunnel itself. Based on in-depth analysis and research on the operation of existing shield tunnels, we found that tunnels often experience obvious settlement after construction, and even large differential deformations in local areas. When this deformation is severe, it may even cause water leakage in the tunnel segments, which will have an adverse effect on the durability and normal use of the tunnel structure.

[0004] At present, subway tunnel vibration reduction is mainly carried out using flexible materials such as rubber or steel springs. Although these measures can reduce vibration to a certain extent, they also reduce the vertical stiffness of the tunnel structure, thereby increasing the vertical displacement. This increase in displacement accelerates the phenomenon of rail wave wear. Rail wave wear not only becomes the main source of noise pollution, seriously affecting the living experience of urban residents, but also shortens the service life of the track structure and significantly increases the maintenance and repair costs of the track. In the long run, this will undoubtedly bring potential risks and hidden dangers to the safe and stable operation of urban rails, which urgently need to be taken seriously and effective measures should be taken to solve them. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide a vibration reduction foundation for an underground station and a construction method thereof, the technical problem to be solved is: how to improve the vibration reduction performance of a subway tunnel.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a vibration reduction foundation for a subway tunnel, comprising a tunnel segment, a steel pipe pile and a reaction mechanism, wherein a pile pressing hole is drilled at the bottom of the tunnel segment, the steel pipe pile is suitable for being installed through the pile pressing hole, and the bottom of the steel pipe pile extends to the lower end to enter the stratum below the bottom of the tunnel segment, and the upper end is connected to the tunnel segment and connected to the reaction mechanism; the reaction mechanism is suitable for pressing the steel pipe pile into the stratum below the tunnel;

[0007] The reaction mechanism includes anchor rods, reaction steel frames and jacks. The anchor rods are installed in the tunnel segments. The tops of the steel pipe piles are connected to the jacks. The reaction steel frames are installed on the roadbed of the tunnel segments. An electric hoist is installed on the top of the jack, and the output end of the electric hoist is suitable for connection with the jack. Anchor rods are installed on both sides of the steel pipe piles. The anchor rods are suitable for inserting into the roadbed and the tunnel segments.

[0008] In a further technical solution, the tunnel segments are installed in multiple groups and in parallel; a closed pile head is installed on the top of the steel pipe pile, the closed pile head is fixedly installed on the top of the steel pipe pile, and the top is suitable for active connection with the bottom of the jack.

[0009] In a further technical solution, multiple groups of tunnel segments are distributed along the axial direction with pile areas and pile-free areas; the steel pipe piles are installed in the pile areas, and the spacing or pile length of the steel pipe piles decreases along the direction connecting one end of the pile area to the end connecting the pile-free area, and the frequency of the decrease is set to 2 groups / times.

[0010] In a further technical solution, a transition area between the pile arrangement area and the pile-free area is also included along the length direction of the multiple groups of tunnel segments, and the steel pipe piles are also arranged in the transition area; in the transition area, the spacing or pile length of the steel pipe piles increases or decreases along the direction connecting one end of the pile arrangement area to the end connecting the pile-free area.

[0011] In a further technical solution, it is characterized in that it also includes a pile sealing assembly; the pile sealing assembly includes: an annular water-stop steel ring, a water-stop strip and a steel mesh, the annular water-stop steel ring is installed on the pile hole, and the annular water-stop steel ring is sleeved on the steel pipe pile;

[0012] The pile driving hole is a stepped hole, and a water stop strip is installed inside. The water stop strip is installed around the pile driving hole. A steel mesh is arranged in the pile driving hole, and concrete is poured outside the steel mesh, the water stop strip and the steel mesh.

[0013] The water stop strip is a water stop strip that expands when exposed to water.

[0014] In a further technical solution, the jack includes a hydraulic input end and a working body, and the hydraulic input ends are installed on both sides of the working body and distributed on both sides of the working body; a connecting part is installed on the working body and is suitable for connecting with the working end of the electric hoist; the bottom of the working body is suitable for movably abutting against the closed pile head.

[0015] In a further technical solution, the reaction steel frame includes an arc-shaped outer plate, which is suitable for fitting into the tunnel segment; a transverse plate is arranged at the bottom of the arc-shaped outer plate, and the transverse plates are arranged in multiple groups, and one group of transverse plates is connected to the hydraulic input end of the jack, and the hydraulic input end is suitable for downward output; a threaded sleeve and a position bolt are installed on each group of anchor rods, and the threaded sleeve and the position bolt are both threadedly connected to the anchor rods.

[0016] A construction method for a subway tunnel vibration reduction foundation comprises the following steps:

[0017] Step 1: measuring the conditions of the tunnel and its corresponding environment, and calculating the layout parameters of the steel pipe piles to be installed according to the conditions, wherein the layout parameters at least include the pile length, pile diameter and pile spacing of the steel pipe piles;

[0018] Step 2: according to the arrangement parameters in step a, the pile holes are drilled at corresponding positions, and the reaction mechanism is installed in the tunnel segment;

[0019] Step 3: Move the curved outer plate in the reaction steel frame to the corresponding position in line with the tunnel segment, and the external hydraulic station inputs hydraulic oil to the two sets of hydraulic input ends to drive the working body of the jack to move downward, abut against the top of the steel pipe pile, and continue to press downward;

[0020] The corresponding steel pipe piles are pressed into the pile holes and reach the designed elevation;

[0021] Step 4: seal the steel pipe piles, reserve an installation groove in the pile hole in advance, install the water stop strip in the installation groove, then make the annular water stop steel ring abut against the water stop strip downward, and pour concrete on the outside of the water stop strip and the annular water stop, and let it stand for curing to form.

[0022] Compared with the prior art, the underground station vibration reduction foundation and its construction method have the following beneficial effects:

[0023] The steel pipe piles introduced in the present invention increase the vertical rigidity of the tunnel structure to resist deformation, can effectively reduce tunnel settlement and vibration, and reduce rail wave wear. At the same time, it meets the low clearance construction conditions in the tunnel, has a fast construction speed, and has little disturbance to the surrounding environment, and can be applied to the settlement and vibration control of existing tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a lateral schematic diagram of a subway tunnel vibration reduction foundation provided by one embodiment of the present invention;

[0025] Figure 2 is a cross-sectional schematic diagram of a subway tunnel vibration reduction foundation provided by one embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the distribution of steel pipe piles in one embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of the distribution of steel pipe piles in another embodiment of the present invention;

[0028] Figure 5 It is a schematic flow chart of a construction method of a subway tunnel vibration reduction foundation in one embodiment of the present invention;

[0029] Figure 6 is a lateral schematic diagram of a subway tunnel vibration reduction foundation in another embodiment of the present invention;

[0030] Figure 7 It is a schematic diagram of the installation of the steel pipe pile of the present invention at the pile pressing hole.

[0031] In the figure: 1. Tunnel segment; 2. Ballast bed; 31. Steel pipe pile; 32. Pile hole; 33. Anchor rod; 34. Reaction steel frame; 35. Jack; 36. Electric hoist; 37. Closed pile head; 4. Pile layout area; 5. Pile-free area; 6. Transition area; 7. Annular waterstop steel ring; 8. Waterstop strip; 9. Steel mesh; 351. Hydraulic input end; 352. Working body; 353. Connection part; 341. Arc outer plate; 342. Transverse plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Please refer to Figures 1 to 4 On the one hand, the present invention provides a subway tunnel vibration reduction foundation 3, including a steel pipe pile 31, a reaction force mechanism, and a pile hole 32 excavated at the bottom of the tunnel segment 1. The steel pipe pile 31 passes through the pile hole 32, and the lower end enters the stratum below the tunnel, and the upper end is connected to the tunnel segment 1; the reaction force mechanism is suitable for pressing the steel pipe pile 31 into the stratum below the tunnel.

[0034] In an optional embodiment, the steel pipe pile 31 is an open small-diameter steel pipe pile. The length of a single pile section is selected according to the clearance in the tunnel and the pile frame, and is generally 2 to 3 meters long. In order to reduce the impact of the circular hole on the integrity of the shield segment, it is advisable to set it in the middle position of the segment along the longitudinal direction of the tunnel, avoiding the embedded parts of the segment. The segment should avoid the segment annular joint position in the circumferential direction, and the distance from the segment annular joint should be no less than 1 times the opening diameter.

[0035] In an optional embodiment, the steel pipe piles 31 are arranged along the running direction of the subway to cover the influence range of sensitive buildings; Figure 2 In an illustrative embodiment,

[0036] The reaction mechanism includes an anchor rod 33, a reaction steel frame 34 and a jack 35. One end of the steel pipe pile 31 is connected to the reaction steel frame 34 through the jack 35. The reaction steel frame 34 is arranged on the ballast 2 in the tunnel segment 1 and is connected to the tunnel segment 1 through the anchor rod 33. In order to avoid the influence of local force on the segment during the pile pressing process, the pile frame can be counterweighted as needed.

[0037] In an optional embodiment, the subway tunnel includes a pile area and a pile-free area along the length of the tunnel; the steel pipe piles 31 are arranged in the pile area, and in the pile area, the spacing and pile length of the steel pipe piles match the vibration reduction requirements of the corresponding area.

[0038] Among them, Figure 3 and Figure 4 In the illustrated embodiment, the subway tunnel also includes a transition area between the pile area and the pile-free area along the tunnel length direction, and the steel pipe piles 31 are also arranged in the transition area; in the transition area, the spacing or pile length of the steel pipe piles 31 gradually changes along the direction connecting one end of the pile area to one end of the pile-free area. This can help coordinate the overall longitudinal deformation of the shield tunnel.

[0039] in Figure 3 In the illustrated embodiment, in the transition area, the spacing of the steel pipe piles 31 gradually increases along the direction from one end of the pile area to one end of the pile-free area. The so-called gradually increasing here does not only mean that each spacing is larger than the previous one, that is, it does not necessarily change one by one, but can also change two by two, for example, the first and second spacings are the same, the third and fourth spacings are the same and larger than the first and second spacings, or even three or four by three, and so on;

[0040] in Figure 4In the illustrated embodiment, in the transition area, the length of the steel pipe pile 31 gradually decreases along the direction from the end connecting the pile area to the end connecting the pile-free area. The term "gradually decreasing" here does not only mean that each steel pipe pile 31 is smaller than the previous one, that is, it does not necessarily change one by one, but can also change two by two, for example, Figure 4 As shown, the first and second steel pipe piles 31 have the same length, and the third and fourth steel pipe piles 31 have the same length and are longer than the first and second steel pipe piles 31, or even three or four in sequence, and so on;

[0041] In one embodiment, the steel pipe piles at the location of the tunnel segment adjacent to the subway station are arranged at a higher density than those at the location not adjacent to the subway station. The higher density referred to here can be understood as relatively smaller spacing; this can be beneficial to coordinating the overall longitudinal deformation of the shield tunnel.

[0042] exist Figure 1 In the illustrated embodiment, the steel pipe pile 31 is arranged at the bottom center of the tunnel segment 1 and enters the soil below the tunnel;

[0043] exist Figure 2 In the illustrated embodiment, the steel pipe piles 31 are arranged at the bottom of the tunnel segment 1 and enter into the soil below the tunnel; and are symmetrically arranged on both sides of the central vertical section of the tunnel segment 1.

[0044] In a further technical solution, multiple groups of tunnel segments 1 are installed in parallel; a closed pile head 37 is installed on the top of the steel pipe pile 31, and the closed pile head 37 is fixedly installed on the top of the steel pipe pile 31, and the top is suitable for active connection with the bottom of the jack 35.

[0045] Example 2

[0046] like Figure 6 and Figure 7 As shown, another embodiment of the present invention further includes a pile sealing assembly based on Example 1; the pile sealing assembly includes: an annular water-stop steel ring 7, a water-stop strip 8 and a steel mesh 9, an annular water-stop steel ring 7 is installed on the pile hole 32, and the annular water-stop steel ring 7 is sleeved on the steel pipe pile 31;

[0047] The pile hole 32 is a stepped hole, and a water stop strip 8 is installed inside. The water stop strip 8 is installed around the pile hole 32. A steel mesh 9 is arranged inside the pile hole 32, and concrete is poured on the steel mesh 9, the water stop strip 8 and outside the steel mesh 9. The water stop strip 8 is a water-expanding water stop strip 8.

[0048] The jack 35 includes a hydraulic input end 351 and a working body 352. The hydraulic input ends 351 are installed on both sides of the working body 352 and are distributed on both sides of the working body 352. A connecting part 353 is installed on the working body 352 and is suitable for connecting with the working end of the electric hoist 36. The bottom of the working body 352 is suitable for movably abutting against the closed pile head 37.

[0049] like Figure 6 As shown, the reaction steel frame 34 includes an arc-shaped outer plate 341, which is suitable for fitting the tunnel segment 1; a transverse plate 342 is arranged at the bottom of the arc-shaped outer plate 341, and a plurality of groups of transverse plates 342 are arranged, and a group of transverse plates 342 is connected to the hydraulic input end 351 of the jack 35, and the hydraulic input end 351 is suitable for downward output; a threaded sleeve and a position bolt are installed on each group of anchor rods 33, and the threaded sleeve and the position bolt are both threadedly connected to the anchor rods 33.

[0050] The construction method provided by the present invention comprises the following specific steps:

[0051] Step 1: Measure the conditions of the tunnel and its corresponding environment, and calculate the layout parameters of the steel pipe piles 31 to be installed based on the conditions. The layout parameters at least include the pile length, pile diameter and pile spacing of the steel pipe piles 31; the corresponding parameters may include Figure 5 Step 1 recorded in the illustrated implementation method:

[0052] According to the requirements of strata, settlement control and vibration reduction, the pile length, pile diameter, pile spacing and other parameters are determined by comprehensive calculation. In a further specific implementation, it can also include: according to the settlement control and vibration reduction requirements, soil layer conditions and other conditions, combined with the vibration measurement of the roadbed 2 and tunnel wall in the original tunnel or the same type of tunnel, a finite element analysis model is established to calculate and determine the appropriate pile foundation arrangement plan;

[0053] It can satisfy the following:

[0054] The length of piles arranged along the direction of subway operation should cover the affected area of ​​sensitive buildings.

[0055] The shield tunnel should adopt the transition method of variable pile spacing or variable pile length between the pile arrangement area and the pile-free area.

[0056] In order to coordinate the deformation of the shield tunnel and station structure, the pile spacing should be increased in the area adjacent to the subway station.

[0057] Step 2: According to the arrangement parameters in the previous step, the pile hole 32 is drilled at the corresponding position, and the reaction mechanism is installed in the tunnel segment 1; the corresponding may include Figure 5Step 2 recorded in the illustrated implementation method: a circular hole is excavated in the tunnel; at the same time, a reaction mechanism is installed, and the pile frame can be erected along the longitudinal or circumferential direction of the tunnel; a counterweight block can be set to reduce the impact on the segment structure during the pile driving process.

[0058] Step 3: Press the corresponding steel pipe pile 31 into the pile hole 32 and reach the designed elevation; the corresponding may include Figure 5 Step 3 described in the illustrated embodiment: pressing the steel pipe pile 31 in sections;

[0059] Step 4: Sealing the steel pipe pile 31 may include: Figure 5 Step 4 recorded in the illustrated implementation method: Seal the pile head 37 and take water-stopping measures. Reliable water-stopping measures should be taken when sealing the steel pipe pile 31 in the tunnel. An annular water-stopping steel ring can be welded on the pile head, and a water-swelling water-stopping strip 8 can be set between the pile sealing hole and the open segment. A steel mesh 9 is added to the pile sealing hole to strengthen the segment structure, and the pile sealing mouth should be cast with micro-expansion early-strength concrete.

[0060] Compared with existing vibration reduction technologies such as fasteners and floating slab ballast, the implementation method of the present invention can have the following advantages and beneficial effects:

[0061] 1) After the steel pipe piles are set up in the tunnel, the vertical stiffness of the tunnel is increased, which can effectively reduce the track vibration. At the same time, it can effectively control the structural settlement and reduce the wave wear of the rails.

[0062] 2) Steel pipe piles can be flexibly arranged to increase the vertical stiffness of the tunnel according to different geological conditions and vibration reduction requirements of surrounding sensitive buildings.

[0063] 3) The steel pipe piles used have good durability and can achieve the same service life cycle as the tunnel segment structure and are maintenance-free.

[0064] 4) The construction method has the advantages of no vibration, low noise, and micro-disturbance, which can effectively reduce the impact of construction on existing tunnels.

[0065] In summary, the steel pipe piles introduced in the present invention increase the vertical stiffness of the tunnel structure, can effectively control the settlement and vibration of the tunnel, and reduce the wave wear of the rails. At the same time, it meets the low clearance construction conditions in the tunnel, has a fast construction speed, and has little disturbance to the surrounding environment. It can be applied to the settlement and vibration control of existing tunnels.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A vibration reduction foundation for a subway tunnel, characterized in that: The invention comprises a tunnel segment (1), a steel pipe pile (31) and a reaction mechanism, wherein a pile pressing hole (32) is drilled at the bottom of the tunnel segment (1), the steel pipe pile (31) is suitable for being installed through the pile pressing hole (32), and the bottom of the steel pipe pile (31) extends to the lower end to enter the stratum below the bottom of the tunnel segment (1), and the upper end is connected to the tunnel segment (1) and is connected to the reaction mechanism; the reaction mechanism is suitable for pressing the steel pipe pile (31) into the stratum below the tunnel; The reaction mechanism comprises an anchor rod (33), a reaction steel frame (34) and a jack (35); the anchor rod (33) is installed in the tunnel segment (1); the top of the steel pipe pile (31) is connected to the jack (35); the reaction steel frame (34) is installed on the ballast (2) of the tunnel segment (1); an electric hoist (36) is installed on the top of the jack (35), and the output end of the electric hoist (36) is suitable for being connected to the jack (35); anchor rods (33) are installed on both sides of the steel pipe pile (31); the anchor rods (33) are suitable for being inserted into the ballast (2) and the tunnel segment (1).

2. The vibration reduction foundation of a subway tunnel according to claim 1, characterized in that: The tunnel segments (1) are installed in multiple groups and are installed in parallel; a closed pile head (37) is installed on the top of the steel pipe pile (31), and the closed pile head (37) is fixedly installed on the top of the steel pipe pile (31), and the top is suitable for being movably connected to the bottom of a jack (35).

3. The vibration reduction foundation of a subway tunnel according to claim 2, characterized in that: A plurality of groups of tunnel segments (1) are provided with pile areas (4) and pile-free areas (5) distributed along the axial direction; the steel pipe piles (31) are installed in the pile areas (4); the spacing or pile length of the steel pipe piles (31) decreases along the direction connecting one end of the pile area (4) to one end of the pile-free area (5), and the decreasing frequency is set to 2 groups / times.

4. The vibration reduction foundation for a subway tunnel according to claim 3, characterized in that: A transition area (6) between the pile arrangement area (4) and the pile-free area (5) is also included along the length direction of the multiple groups of tunnel segments (1), and the steel pipe piles (31) are also arranged in the transition area (6); in the transition area (6), the spacing or pile length of the steel pipe piles (31) increases or decreases along the direction connecting one end of the pile arrangement area (4) to one end of the pile-free area (5).

5. A subway tunnel vibration reduction foundation according to claim 3 or 4, characterized in that: It also includes a pile sealing assembly; the pile sealing assembly includes: an annular water-stop steel ring (7), a water-stop strip (8) and a steel mesh (9); the annular water-stop steel ring (7) is installed on the pile-pressing hole (32), and the annular water-stop steel ring (7) is sleeved on the steel pipe pile (31); The pile driving hole (32) is a stepped hole and is internally provided with a water stop strip (8), the water stop strip (8) being installed around the pile driving hole (32); a steel mesh (9) is provided in the pile driving hole (32), and concrete is poured outside the steel mesh (9), the water stop strip (8) and the steel mesh (9). The water stop strip (8) is a water stop strip (8) that swells when in contact with water.

6. The vibration reduction foundation for a subway tunnel according to claim 5, characterized in that: The jack (35) comprises a hydraulic input end (351) and a working body (352), wherein the hydraulic input ends (351) are installed on both sides of the working body (352) and are distributed on both sides of the working body (352); a connecting portion (353) is installed on the working body (352) and is suitable for being connected to the working end of the electric hoist (36); and the bottom of the working body (352) is suitable for being movably abutted against the closed pile head (37).

7. The vibration reduction foundation of a subway tunnel according to claim 6, characterized in that: Said The reaction steel frame (34) comprises an arc-shaped outer plate (341), and the arc-shaped outer plate (341) is suitable for fitting the tunnel segment (1); a transverse plate (342) is arranged at the bottom of the arc-shaped outer plate (341), and the transverse plates (342) are arranged in multiple groups, and one group of transverse plates (342) is connected to the hydraulic input end (351) of the jack (35), and the hydraulic input end (351) is suitable for outputting downward; each group of anchor rods (33) is installed with a threaded sleeve and a position bolt, and the threaded sleeve and the position bolt are both threadedly connected to the anchor rod (33).

8. A construction method for a subway tunnel vibration reduction foundation, comprising the subway tunnel vibration reduction foundation according to claim 6, characterized in that: The following steps are also included: Step 1: measuring the conditions of the tunnel and its corresponding environment, and calculating the layout parameters of the steel pipe piles (31) to be installed according to the conditions, wherein the layout parameters at least include the pile length, pile diameter and pile spacing of the steel pipe piles (31); Step 2: according to the arrangement parameters in step a, the pile-pressing hole (32) is excavated at a corresponding position, and the reaction mechanism is installed in the tunnel segment (1); Step 3: The arc-shaped outer plate (341) in the reaction steel frame (34) is moved to a corresponding position in contact with the tunnel segment (1), and the external hydraulic station inputs hydraulic oil to the two sets of hydraulic input ends (351), driving the working body (352) of the jack (35) to move downward, abut against the top of the steel pipe pile (31), and continue to press downward; The corresponding steel pipe pile (31) is pressed into the pile pressing hole (32) and reaches the designed elevation; Step 4: The steel pipe pile (31) is sealed, a mounting groove is reserved in advance in the pile hole (32), the water stop strip (8) is installed in the mounting groove, and then the annular water stop steel ring (7) is downwardly abutted against the water stop strip (8), and concrete is poured on the outside of the water stop strip (8) and the annular water stop, and then left to stand for curing to form.

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