CN116427951A - Top-pull combined type pipe jacking construction equipment and construction method thereof - Google Patents

Abstract

The invention provides a jacking-pulling combined jacking pipe construction device which comprises a machine head, a jacking pipe and a jacking system, wherein the jacking system is arranged at the rear end of the jacking pipe and supported on a counter-force wall in an originating well, jacking force is applied to the jacking pipe and the machine head, a pulling system is arranged in a receiving well, and the pulling system comprises a sliding flat car, an electric steel cable winding drum, a first annular jacking iron, a first jack and a steel cable; the first jack is connected between the first annular ejector iron and the counter-force wall around the ejection hole; an automatic hydraulic jaw is arranged at the center point of the annular top iron; the steel cable is connected to the center of the front end of the machine head and passes through an automatic hydraulic jaw, the automatic hydraulic jaw clamps the steel cable, and the first jack pushes the first annular jacking iron to apply tension to the steel cable, so that the machine head and the jacking pipe are pulled. By the cooperative jacking and pulling work of the jacking system and the pulling system, the stability of the tunnel face in the construction process can be realized, and the problems that the jacking machine head is easy to jack and the deviation is difficult to rectify in a weak stratum are solved.

Description

Top-pull combined type pipe jacking construction equipment and construction method thereof

Technical Field

The invention relates to the technical field of pipe jacking construction equipment, in particular to top pulling combined pipe jacking construction equipment and a construction method thereof.

Background

The jacking pipe construction is to overcome the friction force between the pipeline and the surrounding soil by means of the jacking force generated by jacking equipment in a working pit, jack the pipeline into the soil according to the designed gradient and transport away the earthwork. After one pipe joint is pushed into the soil layer, a second pipe joint is pushed into the soil layer continuously. With the gradual maturity of pipe jacking construction methods, large-size long-distance pipe jacking construction has become a common method in underground tunnel construction, and the traditional open pipe jacking construction faces some problems in the construction process: (1) stability problem of face: according to the working principle of the pipe jacking machine, during the process of installing a new pipe joint, a jack of a jacking system is required to be disconnected, so that the soil pressure of the working face is reduced, serious consequences such as machine head backing, working face collapse, soil body settlement and the like can be possibly caused, and particularly, when a loose stratum (such as backfill soil) is jacked and excavated, the working face collapse accident occurs; (2) head tip bias problem: because of the complexity of engineering geological conditions, the pipe jacking penetrating through the stratum often encounters weak stratum (such as mucky soil stratum), so that the pipe jacking machine head is easy to sink, and deviation correction is difficult; (3) the thrust is difficult to predict accurately: because regional geological conditions are complex and changeable, the geological information of the jacking pipe penetrating through the stratum is difficult to accurately describe by the vertical geological exploration hole, so that the jacking force cannot be accurately predicted, and the jacking system design and the counter-force wall design cannot be according to accurate parameters, so that jacking failure or resource waste is caused.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides the jacking-pulling combined jacking pipe construction equipment, which can realize stable working face in the construction process by the cooperative jacking and pulling work of a jacking system and a pulling system and solve the problems that a jacking machine head is easy to jack and deviation is difficult to correct in a weak stratum.

The technical scheme adopted for achieving the purposes of the invention is as follows:

the jacking system is arranged at the rear end of the jacking pipe and supported on a counter-force wall in the starting well, so that jacking force is applied to the jacking pipe and the machine head to enable the machine head and the jacking pipe to push towards the jacking hole of the receiving well, and a traction system is arranged in the receiving well and comprises a sliding flat car, an electric steel cable reel, a first annular jacking iron, a first jack and a steel cable; the receiving well is internally provided with a guide rail, the sliding flat car is slidably arranged on the guide rail and horizontally moves along the axial direction of the jacking pipe, the electric steel cable winding drum and the first annular jacking iron are both fixed on the upper surface of the sliding flat car, the central point of the first annular jacking iron and the central point of the ejection hole are positioned on the same horizontal line, the diameter of the first annular jacking iron is larger than that of the ejection hole, and more than 3 first jacks are arranged and uniformly and horizontally distributed and connected between the first annular jacking iron and counterforce walls around the ejection hole; an automatic hydraulic jaw is arranged at the center point of the annular top iron; the automatic hydraulic jaw clamping device is characterized in that a horizontal drilling hole is communicated between the jacking hole and the jacking hole, one end of a steel cable is connected to the center of the front end of the machine head, the other end of the steel cable sequentially penetrates through the horizontal drilling hole, the jacking hole and the automatic hydraulic jaw of the first annular jacking iron and then is connected to the electric steel cable drum, when the jacking pipe construction equipment is used for construction, the automatic hydraulic jaw clamps the steel cable, and the first jack pushes the first annular jacking iron to apply tension to the steel cable, so that the machine head and the jacking pipe are pulled.

The center of the machine head is provided with a traction rod, three blades are welded between the traction rod and the inner wall of the machine head and are perpendicular to the inner wall of the machine head, wherein an included angle between two blades positioned at the lower part is 120-150 degrees, and one blade positioned at the upper part is arranged along the vertical direction and equally divides the upper space in the machine head.

The center of the front end of the traction rod is provided with a traction ring for connecting a steel cable.

The jacking system comprises a second annular jacking iron and a second jack, wherein the second annular jacking iron is connected to the rear end of the jacking pipe, the center point of the second annular jacking iron and the center point of the jacking pipe are positioned on the same horizontal line, the second jack is provided with more than 3 jacks and uniformly and horizontally distributed and connected between the second annular jacking iron and the counter-force wall of the originating well, and the second jack pushes the second annular jacking iron, so that jacking force is applied to the jacking pipe and the machine head.

The second jack is evenly installed on the second annular base, the second annular base is fixedly installed on the counter-force wall of the originating well through expansion bolts, and the center point of the second annular base and the center point of the jacking pipe are located on the same horizontal line.

The electric steel cable winding drum and the first annular top iron are fixedly connected to the sliding flat car through bolts.

The first jack is evenly installed on the first annular base, the first annular base is fixedly installed on the counter-force wall around the ejection hole through expansion bolts, and the center point of the first annular base and the center point of the ejection hole are located on the same horizontal line.

The invention also provides a construction method of the jacking-pulling combined type jacking pipe construction equipment, which comprises the following steps of: (1) Constructing and manufacturing an originating well and a receiving well according to design requirements, reserving a jacking hole on the side wall of the originating well, which is close to the receiving well, and installing a jacking pipe water-stopping embedded part; reserving an ejection hole on the side wall of the receiving well, which is close to the starting well, and grouting and reinforcing the ejection hole and the ejection hole; pouring counterforce walls on the side walls opposite to the ejection hole and around the ejection hole;

(2) Drilling straight line from the center of the ejection hole to the center of the ejection hole by using a horizontal screw drill, and drilling through between the originating well and the receiving well to form a horizontal drilling hole; meanwhile, in the drilling process of the horizontal spiral drilling machine, geological information penetrating through stratum is collected;

(3) Placing a steel cable in the starting well, connecting one end of the steel cable to the front end of a horizontal spiral drilling machine, and dragging one end of the steel cable back to the receiving well through the horizontal spiral drilling machine;

(4) Installing a traction system in the receiving well, enabling one end of the steel cable to pass through an automatic hydraulic jaw at the center of the first annular top iron and then be connected to the electric steel cable drum, and controlling the automatic hydraulic jaw to clamp the steel cable;

(5) Installing a nose, a jacking pipe and a jacking system in the starting well, and connecting one end of a steel cable positioned in the starting well to the center of the front end of the nose;

(6) The jacking system carries out jacking pipe construction according to a jacking working flow, a first jack in the traction system pushes the first annular jacking iron, a pulling force is applied to the steel cable, the machine head and the jacking pipe are pulled, and the auxiliary jacking system pushes the jacking pipe and the machine head towards the receiving well;

(7) In the process of pushing the machine head, after the machine head pushes the depth of 20-40cm, transporting away two soil bodies at the upper part formed by cutting by the three blades, after the machine head continues pushing the depth of 20-40cm, transporting away one soil block at the lower part which is not transported away in the previous working condition and two new soil bodies at the upper part in the working condition, and repeating the steps in sequence;

(8) When a new pipe joint is installed in the originating well, the jacking system is disconnected, and the traction system continues to maintain traction tension, so that the soil pressure of the tunnel face is kept to be larger than the static soil pressure;

(9) After the installation of a new pipe joint of the starting well is completed, the jacking system is connected with the restoring jacking force again, the traction system releases the jacking force of the first jack, the jacking of the first jack is retracted, the automatic hydraulic pliers are loosened, the electric steel cable winding drum is started, the trolley is moved to the initial position, and then the automatic hydraulic pliers are clamped to restore the tension of the traction system;

(10) Repeating steps (6) to (9) until the handpiece reaches the receiving well.

Compared with the prior art, the technical scheme provided by the invention has the following advantages:

1. the jacking and pulling combined jacking pipe construction equipment provided by the invention comprises a machine head, a jacking pipe and a jacking system, and also comprises a pulling system, wherein the machine head and the jacking pipe are pushed by the jacking system, and simultaneously the machine head and the jacking pipe are pulled by the pulling system, so that the stability of a tunnel face in the construction process can be realized by the cooperative jacking and pulling work of the jacking system and the pulling system, and the problems that the jacking machine head is easy to jack and the correction is difficult in a weak stratum are solved; and when the horizontal spiral drilling machine is used for constructing the horizontal drilling in advance, the continuous geological information of the jacking pipe penetrating through the stratum can be obtained, and the accurate prediction of the jacking force is realized, so that accurate design parameters are provided for jacking system design and counterforce wall design. Thereby improving the construction safety and the construction efficiency and reducing the construction cost.

2. The traction system comprises a sliding flat car, an electric steel cable winding drum, a first annular top iron with an automatic hydraulic jaw, a first jack and a steel cable, wherein the first annular top iron, the first jack and the steel cable are connected between a machine head and the first annular top iron through the steel cable, the automatic hydraulic jaw on the first annular top iron clamps the steel cable, and the first jack is ejected out, so that tension is applied to the steel cable to pull the machine head and the top pipe, and when a new pipe joint is installed, the traction system continuously maintains traction tension to keep the soil pressure of a working face to be larger than the static soil pressure, so that the stability of the working face in the construction process is realized. When the automatic hydraulic jaw is released, the electric steel cable winding drum can wind up the steel cable, so that the construction is convenient.

3. In the invention, three blades are welded on the vertical inner wall of the machine head, the included angle between two blades positioned at the lower part is 120-150 degrees, and one blade positioned at the upper part is arranged along the vertical direction, so that the upper space in the machine head is equally divided, and the stability of a face when cutting soil can be ensured; meanwhile, the soil body excavation mode in the application can maintain stability of the tunnel face and avoid collapse of the soil body.

Drawings

FIG. 1 is a schematic installation diagram of a jacking combined type pipe jacking construction equipment provided by the invention;

FIG. 2 is a schematic cross-sectional view of a handpiece in accordance with the present invention;

in the figure: 100-of an originating well, 200-of a receiving well, 300-of an ejection hole, 400-of an ejection hole, 500-of a hole reinforcing layer and 600-of a counterforce wall;

the hydraulic machine comprises a machine head, a 101-traction rod, 102-blades, 2-jacking pipes, 3-second annular jacking irons, 4-second jacks, 5-second annular bases, 6-sliding flat cars, 7-electric steel cable reels, 8-first annular jacking irons, 9-first jacks, 10-steel cables, 11-first annular bases and 12-automatic hydraulic jaws.

Detailed Description

The invention will now be described in more detail with reference to the drawings and examples.

The installation schematic diagram of the jacking-pulling combined type jacking pipe construction equipment provided by the invention is shown in fig. 1, and the jacking pipe construction equipment comprises a machine head 1, a jacking pipe 2, a jacking system and a traction system. Wherein the jacking system is installed in the initiation well 100 and the pulling system is installed in the receiving well 200.

In this embodiment, an ejection hole 300 is reserved on a side wall of the receiving well, which is close to the receiving well, and an ejection hole 400 is reserved on a side wall of the receiving well, specifically, in order to keep stability of the ejection hole and the ejection hole, grouting reinforcement is usually required for the ejection hole and the ejection hole, so as to form a hole reinforcement layer 500. To facilitate installation of the later jacking system and pulling system, reaction walls 600 are cast with reinforced concrete on the opposite side walls of the jacking hole of the originating well and around the jacking hole of the receiving well, see fig. 1.

The jacking pipe is formed by splicing multiple sections of pipe joints, the machine head is arranged at the front end of the jacking pipe and positioned at the jacking hole of the starting well, the jacking system is arranged at the rear end of the jacking pipe and supported on the counter-force wall in the starting well, and the central point of the jacking pipe, the jacking hole and the central point of the jacking hole are all positioned on the same horizontal line. Specifically, the jacking system comprises a second annular jacking iron 3 and a second jack 4, wherein the second annular jacking iron is connected to the rear end of the jacking pipe, the center point of the second annular jacking iron and the center point of the jacking pipe are positioned on the same horizontal line, the second jacks are provided with more than 3 and are uniformly and horizontally distributed and connected between the second annular jacking iron and the counter-force wall of the starting well, further, the second jacks are uniformly arranged on a second annular base 5, the second annular base is fixedly arranged on the counter-force wall of the starting well through expansion screws, the center point of the second annular base and the center point of the jacking pipe are positioned on the same horizontal line, the second jacks are connected to the second annular jacking iron one by one, and as shown in fig. 1, the second jacks push the second annular jacking iron, so that jacking forces are applied to the jacking pipe and the machine head, and the jacking pipe are pushed towards the ejection hole of the receiving well.

In the embodiment, a traction rod 101 is arranged at the center of the machine head, three blades 102 are welded between the traction rod and the inner wall of the machine head, the blades are made of high-strength steel, and the three blades are perpendicular to the inner wall of the machine head and used for cutting soil bodies and maintaining stability of a tunnel face. The thickness and width of the blade are set according to the diameter parameters of the machine head and the requirements of strength, rigidity and stability. The included angle between the two blades positioned at the lower part is 120-150 degrees, and one blade positioned at the upper part is arranged along the vertical direction, so that the upper space in the machine head is equally divided, and the stability of the palm face can be ensured when the machine head is propelled as shown in fig. 2. Specifically, a traction ring for connecting the steel cable is arranged at the center of the front end of the traction rod.

The jacking system further comprises functional components such as an illumination mechanism, a lubricating mud mechanism and the like, and the components are conventional technology and are not described in detail herein.

The traction system in the embodiment comprises a sliding flat car 6, an electric steel cable drum 7, a first annular top iron 8, a first jack 9 and a steel cable 10; the receiving well is internally provided with a guide rail (not shown in the figure), the sliding flat car is slidably arranged on the guide rail and horizontally moves along the axial direction of the jacking pipe, the electric steel cable winding drum and the first annular jacking iron are fixed on the upper surface of the sliding flat car through bolts, the electric steel cable winding drum, the first annular jacking iron and the first annular jacking iron form a whole, and the center point of the first annular jacking iron and the center point of the ejection hole are located on the same horizontal line.

The diameter of first annular ejector iron is greater than the diameter of ejecting entrance to a cave, first jack is provided with more than 3 to even horizontal distribution connects between the counter-force wall around first annular ejector iron and ejecting entrance to a cave, specifically, first jack evenly installs on first annular base 11, and first annular base passes through expansion screw fixed mounting on counter-force wall around ejecting entrance to a cave, and the central point of first annular base and the central point of ejecting entrance to a cave are located same horizontal line, with first jack one-to-one on first annular ejector iron again. Further, an automatic hydraulic jaw 12 is installed at the center point of the annular top iron; and a horizontal drilling hole is communicated between the jacking hole and the jacking hole, and is constructed through a horizontal spiral drilling machine.

One end of the steel cable is connected to the traction ring at the center of the front end of the machine head, the other end of the steel cable sequentially passes through the horizontal drilling hole, the ejection hole and the automatic hydraulic jaw of the first annular jacking iron and is connected to the electric steel cable winding drum, when the pipe jacking construction equipment is constructed, the automatic hydraulic jaw is regulated to clamp the steel cable, the first jack pushes the first annular jacking iron, and tension is applied to the steel cable, so that the machine head and the pipe jacking are drawn. Specifically, the steel cables are high-strength steel cables with different specifications according to different parameters of the diameter of the jacking pipe.

The invention also provides a construction method of the jacking-pulling combined type jacking pipe construction equipment, which comprises the following steps of: (1) Constructing and manufacturing an originating well and a receiving well according to design requirements, reserving a jacking hole on the side wall of the originating well, which is close to the receiving well, and installing a jacking pipe water-stopping embedded part; reserving an ejection hole on the side wall of the receiving well, which is close to the starting well, and grouting and reinforcing the ejection hole and the ejection hole; pouring counterforce walls on the side walls opposite to the jacking hole and around the jacking hole to serve as stress bases of the jacking system and the traction system;

(2) Drilling straight line from the center of the ejection hole to the center of the ejection hole by using a horizontal screw drill, and drilling through between the originating well and the receiving well to form a horizontal drilling hole; meanwhile, in the drilling process of the horizontal spiral drilling machine, geological information penetrating through stratum is collected, and design and construction parameters are provided for subsequent pipe jacking construction;

(3) Placing a steel cable in the starting well, connecting one end of the steel cable to the front end of a horizontal spiral drilling machine, and dragging one end of the steel cable back to the receiving well through the horizontal spiral drilling machine;

(4) Installing a traction system in the receiving well, enabling one end of the steel cable to pass through an automatic hydraulic jaw at the center of the first annular top iron and then be connected to the electric steel cable drum, and controlling the automatic hydraulic jaw to clamp the steel cable;

(5) Installing a nose, a jacking pipe and a jacking system in the starting well, and connecting one end of a steel cable positioned in the starting well to the center of the front end of the nose;

(6) The jacking system carries out jacking pipe construction according to a jacking working flow, a first jack in the traction system pushes the first annular jacking iron, a pulling force is applied to the steel cable, the machine head and the jacking pipe are pulled, and the auxiliary jacking system pushes the jacking pipe and the machine head towards the receiving well;

(7) In the process of pushing the machine head, after the machine head is pushed to a depth of 20-40cm, two upper soil bodies (a and b in fig. 2) formed by cutting by the three blades are carried away, after the machine head is continuously pushed to a depth of 20-40cm, a lower soil block (c in fig. 2) which is not carried away in the previous working condition and two new upper soil bodies in the working condition are carried away, and the steps are repeated in sequence, so that stability of a tunnel face can be maintained, and soil collapse is avoided;

(8) When a new pipe joint is installed in the originating well, the jacking system is disconnected, and the traction system continues to maintain traction tension, so that the soil pressure of the tunnel face is kept to be larger than the static soil pressure;

(9) After the installation of a new pipe joint of the starting well is completed, the jacking system is connected with the restoring jacking force again, the traction system releases the jacking force of the first jack, the jacking of the first jack is retracted, the automatic hydraulic pliers are loosened, the electric steel cable winding drum is started, the trolley is moved to the initial position, and then the automatic hydraulic pliers are clamped to restore the tension of the traction system;

(10) Repeating steps (6) to (9) until the handpiece reaches the receiving well.

Claims (8)

1. The utility model provides a push pipe construction equipment of top pull combination formula, includes aircraft nose, push pipe and jacking system at least, and wherein the push pipe is formed by the concatenation of multisection tube coupling, and the aircraft nose is installed in the front end of push pipe and is located the jacking entrance to a cave department of initiating well, and jacking system installs in the rear end of push pipe and supports on the counter-force wall in the initiating well to apply the jacking force to push pipe and aircraft nose, make aircraft nose and push pipe impel to the ejecting entrance of receiving well, its characterized in that: a traction system is arranged in the receiving well and comprises a sliding flat car, an electric steel cable winding drum, a first annular top iron, a first jack and a steel cable; the receiving well is internally provided with a guide rail, the sliding flat car is slidably arranged on the guide rail and horizontally moves along the axial direction of the jacking pipe, the electric steel cable winding drum and the first annular jacking iron are both fixed on the upper surface of the sliding flat car, the central point of the first annular jacking iron and the central point of the ejection hole are positioned on the same horizontal line, the diameter of the first annular jacking iron is larger than that of the ejection hole, and more than 3 first jacks are arranged and uniformly and horizontally distributed and connected between the first annular jacking iron and counterforce walls around the ejection hole; an automatic hydraulic jaw is arranged at the center point of the annular top iron; the automatic hydraulic jaw clamping device is characterized in that a horizontal drilling hole is communicated between the jacking hole and the jacking hole, one end of a steel cable is connected to the center of the front end of the machine head, the other end of the steel cable sequentially penetrates through the horizontal drilling hole, the jacking hole and the automatic hydraulic jaw of the first annular jacking iron and then is connected to the electric steel cable drum, when the jacking pipe construction equipment is used for construction, the automatic hydraulic jaw clamps the steel cable, and the first jack pushes the first annular jacking iron to apply tension to the steel cable, so that the machine head and the jacking pipe are pulled.

2. The jacking-pulling combined type jacking pipe construction equipment according to claim 1, wherein: the center of the machine head is provided with a traction rod, three blades are welded between the traction rod and the inner wall of the machine head and are perpendicular to the inner wall of the machine head, wherein an included angle between two blades positioned at the lower part is 120-150 degrees, and one blade positioned at the upper part is arranged along the vertical direction and equally divides the upper space in the machine head.

3. The jacking-pulling combined type jacking pipe construction equipment according to claim 2, wherein: the center of the front end of the traction rod is provided with a traction ring for connecting a steel cable.

4. The jacking-pulling combined type jacking pipe construction equipment according to claim 1, wherein: the jacking system comprises a second annular jacking iron and a second jack, wherein the second annular jacking iron is connected to the rear end of the jacking pipe, the center point of the second annular jacking iron and the center point of the jacking pipe are positioned on the same horizontal line, the second jack is provided with more than 3 jacks and uniformly and horizontally distributed and connected between the second annular jacking iron and the counter-force wall of the originating well, and the second jack pushes the second annular jacking iron, so that jacking force is applied to the jacking pipe and the machine head.

5. The jacking-pulling combined type jacking pipe construction equipment according to claim 4, wherein: the second jack is evenly installed on the second annular base, the second annular base is fixedly installed on the counter-force wall of the originating well through expansion bolts, and the center point of the second annular base and the center point of the jacking pipe are located on the same horizontal line.

6. The jacking-pulling combined type jacking pipe construction equipment according to claim 1, wherein: the electric steel cable winding drum and the first annular top iron are fixedly connected to the sliding flat car through bolts.

7. The jacking-pulling combined type jacking pipe construction equipment according to claim 1, wherein: the first jack is evenly installed on the first annular base, the first annular base is fixedly installed on the counter-force wall around the ejection hole through expansion bolts, and the center point of the first annular base and the center point of the ejection hole are located on the same horizontal line.

8. The construction method of the jacking-pulling combined type pipe jacking construction equipment according to claim 2, which is characterized by comprising the following steps: (1) Constructing and manufacturing an originating well and a receiving well according to design requirements, reserving a jacking hole on the side wall of the originating well, which is close to the receiving well, and installing a jacking pipe water-stopping embedded part; reserving an ejection hole on the side wall of the receiving well, which is close to the starting well, and grouting and reinforcing the ejection hole and the ejection hole; pouring counterforce walls on the side walls opposite to the ejection hole and around the ejection hole;

(2) Drilling straight line from the center of the ejection hole to the center of the ejection hole by using a horizontal screw drill, and drilling through between the originating well and the receiving well to form a horizontal drilling hole; meanwhile, in the drilling process of the horizontal spiral drilling machine, geological information penetrating through stratum is collected;

(3) Placing a steel cable in the starting well, connecting one end of the steel cable to the front end of a horizontal spiral drilling machine, and dragging one end of the steel cable back to the receiving well through the horizontal spiral drilling machine;

(4) Installing a traction system in the receiving well, enabling one end of the steel cable to pass through an automatic hydraulic jaw at the center of the first annular top iron and then be connected to the electric steel cable drum, and controlling the automatic hydraulic jaw to clamp the steel cable;

(5) Installing a nose, a jacking pipe and a jacking system in the starting well, and connecting one end of a steel cable positioned in the starting well to the center of the front end of the nose;

(6) The jacking system carries out jacking pipe construction according to a jacking working flow, a first jack in the traction system pushes the first annular jacking iron, a pulling force is applied to the steel cable, the machine head and the jacking pipe are pulled, and the auxiliary jacking system pushes the jacking pipe and the machine head towards the receiving well;

(7) In the process of pushing the machine head, after the machine head pushes the depth of 20-40cm, transporting away two soil bodies at the upper part formed by cutting by the three blades, after the machine head continues pushing the depth of 20-40cm, transporting away one soil block at the lower part which is not transported away in the previous working condition and two new soil bodies at the upper part in the working condition, and repeating the steps in sequence;

(8) When a new pipe joint is installed in the originating well, the jacking system is disconnected, and the traction system continues to maintain traction tension, so that the soil pressure of the tunnel face is kept to be larger than the static soil pressure;

(9) After the installation of a new pipe joint of the starting well is completed, the jacking system is connected with the restoring jacking force again, the traction system releases the jacking force of the first jack, the jacking of the first jack is retracted, the automatic hydraulic pliers are loosened, the electric steel cable winding drum is started, the trolley is moved to the initial position, and then the automatic hydraulic pliers are clamped to restore the tension of the traction system;

(10) Repeating steps (6) to (9) until the handpiece reaches the receiving well.

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