A jacking and pulling combined pipe jacking construction equipment and construction method thereof

Abstract

The present invention provides a combined jacking and pulling type pipe jacking construction equipment, comprising a machine head, a pipe jacking and a jacking system. The jacking system is installed at the rear end of the pipe jacking and supported on the reaction wall in the starting well, applying a jacking force to the pipe jacking and the machine head. A pulling system is installed in the receiving well, and the pulling system comprises a sliding flatbed car, an electric steel cable drum, a first annular jacking iron, a first jack and a steel cable; the first jack is connected between the first annular jacking iron and the reaction wall around the ejection hole; an automatic hydraulic jaw is installed at the center point of the annular jacking iron; the steel cable is connected to the center of the front end of the machine head and passes through the automatic hydraulic jaw, which clamps the steel cable, and the first jack pushes the first annular jacking iron, applying a pulling force to the steel cable, thereby pulling the machine head and the pipe jacking. Through the coordinated pushing and pulling work of the jacking system and the pulling system, the tunnel face can be stabilized during the construction process, solving the problems of easy deviation of the jacking machine head and difficulty in correcting deviation in soft formations.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking construction equipment, and in particular to a top-pull combined pipe jacking construction equipment and a construction method thereof. Background Art

[0002] Pipe jacking involves using the jacking force generated by jacking equipment within a working pit to overcome the friction between the pipe and the surrounding soil, pushing the pipe into the soil according to the designed slope, and then removing the soil. After one pipe section is pushed into the soil, the second pipe section is lowered and jacking continues. With the gradual maturity of the pipe jacking construction method, large-scale and long-distance pipe jacking has become a common method in underground tunnel construction. However, traditional open pipe jacking construction faces some problems during the construction process: (1) Face stability problem: According to the working principle of the pipe jacking machine, the jack of the jacking system needs to be disconnected during the installation of the new pipe section, resulting in a decrease in the face soil pressure, which may cause serious consequences such as machine head retreat, face collapse, and soil settlement. Especially when jacking excavation in loose strata (such as backfill soil), face collapse accidents often occur; (2) Machine head deviation problem: Due to the complexity of engineering geological conditions, the jacking machine often encounters weak strata (such as silty soil strata) when passing through the stratum, which easily causes the jacking machine head to sink and makes correction difficult; (3) It is difficult to accurately predict the jacking thrust: Due to the complex and changeable regional geological conditions, it is difficult for the vertical geological exploration hole to accurately describe the geological information of the stratum through which the pipe is passing, resulting in the inability to accurately predict the jacking thrust, which makes it impossible to design the jacking system and the reaction wall based on accurate parameters, resulting in jacking failure or waste of resources. Summary of the Invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a combined jacking and pulling pipe jacking construction equipment. Through the coordinated jacking and pulling work of the jacking system and the pulling system, the tunnel face can be stabilized during the construction process, and the problems of easy deviation of the jacking head and difficulty in correcting deviation in soft formations can be solved.

[0004] The technical solution adopted to achieve the above-mentioned purpose of the present invention is:

[0005] A jacking and pulling combined jacking pipe construction equipment comprises at least a machine head, a jacking pipe and a jacking system, wherein the jacking pipe is spliced together by multiple pipe sections, the machine head is installed at the front end of the jacking pipe and is located at the jacking hole of the starting well, the jacking system is installed at the rear end of the jacking pipe and is supported on the reaction wall in the starting well, thereby applying a jacking force to the jacking pipe and the machine head, so that the machine head and the jacking pipe are pushed toward the jacking hole of the receiving well, a pulling system is installed in the receiving well, the pulling system comprises a sliding flatbed car, an electric steel cable drum, a first annular jacking iron, a first jack and a steel cable; a guide rail is installed in the receiving well, the sliding flatbed car is slidably installed on the guide rail, and moves horizontally along the axial direction of the jacking pipe, the electric steel cable drum and the first annular jacking iron are both fixed to the upper surface of the sliding flatbed car, and the first annular The center point of the top iron and the center point of the ejection hole are located on the same horizontal line. The diameter of the first annular top iron is larger than the diameter of the ejection hole. There are more than three first jacks, which are evenly distributed horizontally and connected between the first annular top iron and the reaction walls around the ejection hole. An automatic hydraulic jaw is installed at the center point of the annular top iron. A horizontal drill hole is connected between the ejection hole and the ejection hole. One end of the steel cable is connected to the center of the front end of the machine head, and the other end of the steel cable passes through the horizontal drill hole, the ejection hole and the automatic hydraulic jaw of the first annular top iron in sequence, and then is connected to the electric steel cable drum. When the jacking construction equipment is under construction, the automatic hydraulic jaw clamps the steel cable, and the first jack pushes the first annular top iron, exerting tension on the steel cable, thereby pulling the machine head and the jacking pipe.

[0006] A pulling rod is provided at the center of the machine head, and three blades are welded between the pulling rod and the inner wall of the machine head. The three blades are all perpendicular to the inner wall of the machine head. The angle between the two blades at the bottom is 120°-150°, and the upper blade is arranged in the vertical direction to evenly divide the upper space inside the machine head.

[0007] A pulling ring for connecting a steel cable is provided at the center of the front end of the pulling rod.

[0008] The jacking system includes a second annular jack and a second jack, wherein the second annular jack is connected to the rear end of the jacking pipe, and the center point of the second annular jack and the center point of the jacking pipe are located on the same horizontal line. There are more than three second jacks, which are evenly distributed horizontally and connected between the second annular jack and the reaction wall of the starting well. The second jack pushes the second annular jack, thereby applying jacking force to the jacking pipe and the machine head.

[0009] The second jacks are evenly installed on the second annular base, and the second annular base is fixed to the reaction wall of the starting well by expansion screws, and the center point of the second annular base and the center point of the jacking pipe are located on the same horizontal line.

[0010] The electric steel cable drum and the first annular top iron are both fixedly connected to the sliding flatbed vehicle by bolts.

[0011] The first jacks are evenly installed on the first annular base, which is fixed to the reaction wall around the ejection hole by expansion screws, and the center point of the first annular base and the center point of the ejection hole are on the same horizontal line.

[0012] The present invention also provides a construction method for a top-pull combined jacking construction device, comprising the following steps: (1) constructing a starting well and a receiving well according to design requirements, reserving a jacking hole on the side wall of the starting well close to the receiving well, and installing a jacking water-stop embedded part; reserving an ejection hole on the side wall of the receiving well close to the starting well, and grouting and reinforcing the jacking hole and the ejection hole; casting a reaction wall on the side wall opposite to the jacking hole and around the ejection hole;

[0013] (2) Use a horizontal spiral drill to drill straight from the center of the top hole to the center of the top hole, and drill through the starting well and the receiving well to form a horizontal borehole; at the same time, the horizontal spiral drill collects geological information of the stratum during the drilling process;

[0014] (3) Place a steel cable in the starting well, connect one end of the steel cable to the front end of the horizontal auger, and use the horizontal auger to pull one end of the steel cable back to the receiving well;

[0015] (4) Install the pulling system in the receiving well, pass one end of the steel cable through the automatic hydraulic clamp at the center of the first annular top iron, and then connect it to the electric steel cable drum, and control the automatic hydraulic clamp to clamp the steel cable;

[0016] (5) Install the machine head, jacking pipe and jacking system in the launch well, and connect one end of the steel cable in the launch well to the center of the front end of the machine head;

[0017] (6) The jacking system performs jacking construction according to the jacking process. At the same time, the first jack in the traction system pushes the first annular jacking iron, applies tension to the steel cable, pulls the machine head and the jacking pipe, and assists the jacking system in pushing the jacking pipe and the machine head toward the receiving well.

[0018] (7) During the advancement of the machine head, after the machine head advances to a depth of 20-40 cm, the two upper soil blocks formed by the cutting of the three blades are removed. After the machine head continues to advance to a depth of 20-40 cm, the lower soil block that was not removed in the previous working condition and the two new upper soil blocks in this working condition are removed, and this process is repeated in sequence;

[0019] (8) When installing a new pipe section in the launch well, the jacking system is disconnected and the pulling system continues to maintain the pulling force to keep the soil pressure at the tunnel face greater than the static soil pressure;

[0020] (9) After the new pipe section of the launch well is installed, the jacking system is reconnected to restore the jacking force, the traction system releases the jacking force of the first jack, retracts the jacking stroke of the first jack, releases the automatic hydraulic clamp, turns on the electric cable drum, moves the trolley to the initial position, and then clamps the automatic hydraulic clamp to restore the pulling force of the traction system;

[0021] (10) Repeat steps (6) to (9) until the machine head reaches the receiving well.

[0022] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0023] The combined jacking and pulling equipment provided in the present invention includes a machine head, a jacking pipe, a jacking system, and a pulling system. The jacking system propels the machine head and jacking pipe, while the pulling system simultaneously pulls the machine head and jacking pipe. The coordinated pushing and pulling of the jacking and pulling systems stabilizes the tunnel face during construction, resolving the issues of easy deviation of the jacking machine head and difficulty correcting deviation in weak strata. Furthermore, when pre-drilling horizontal holes with a horizontal auger, continuous geological information about the strata through which the jacking pipe passes can be obtained, enabling accurate prediction of the jacking thrust, thereby providing accurate design parameters for the jacking system and reaction wall design. This improves construction safety and efficiency, and reduces construction costs.

[0024] 2. The pulling system of the present invention includes a sliding flatbed, an electric cable drum, a first annular jack with automatic hydraulic jaws, a first jack, and a steel cable. The steel cable connects the machine head and the first annular jack. The automatic hydraulic jaws on the first annular jack clamp the steel cable, and the first jack pushes out, thereby applying tension to the steel cable, pulling the machine head and the jacking pipe. When installing a new pipe section, the pulling system continues to maintain the pulling force, keeping the soil pressure on the tunnel face greater than the static soil pressure, thereby ensuring stability during construction. When the automatic hydraulic jaws are released, the electric cable drum can reel in the steel cable, facilitating construction.

[0025] 3. In the present invention, three blades are welded to the vertical inner wall of the machine head, and the angle between the two blades at the bottom is 120°-150°. The upper blade is arranged in the vertical direction, evenly dividing the upper space inside the machine head, which can ensure the stability of the face when cutting the soil; at the same time, through the soil excavation method in this application, the face can be maintained stable and soil collapse can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the installation of the top-pull combined pipe jacking construction equipment provided by the present invention;

[0027] Figure 2 Schematic cross-section of the nose of the present invention;

[0028] In the figure: 100-launching well, 200-receiving well, 300-entry opening, 400-exit opening, 500-opening reinforcement layer, 600-reaction wall;

[0029] 1-machine head, 101-pulling rod, 102-blade, 2-jacking pipe, 3-second annular jack, 4-second jack, 5-second annular base, 6-sliding flatbed, 7-electric steel cable drum, 8-first annular jack, 9-first jack, 10-steel cable, 11-first annular base, 12-automatic hydraulic jaws. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The installation diagram of the top-pull combined pipe jacking construction equipment provided by the present invention is as follows Figure 1 As shown, the pipe jacking construction equipment includes a machine head 1, a jacking pipe 2, a jacking system and a pulling system. The jacking system is installed in the starting well 100, and the pulling system is installed in the receiving well 200.

[0032] In this embodiment, a jacking hole 300 is reserved on the side wall of the starting well near the receiving well, and an ejection hole 400 is reserved on the side wall of the receiving well near the starting well. Specifically, in order to maintain the stability of the jacking hole and the ejection hole, it is usually necessary to grout the jacking hole and the ejection hole to form a hole reinforcement layer 500. In order to facilitate the installation of the jacking system and the pulling system in the later stage, a reaction wall 600 is cast with reinforced concrete on the side wall opposite to the jacking hole of the starting well and around the ejection hole of the receiving well. Figure 1 .

[0033] The jacking pipe is made up of multiple pipe sections. The machine head is installed at the front end of the jacking pipe and is located at the jacking hole of the starting shaft. The jacking system is installed at the rear end of the jacking pipe and supported on the reaction wall in the starting shaft. The center point of the jacking pipe and the center points of the jacking hole and the ejection hole are all on the same horizontal line. Specifically, the jacking system includes a second annular top iron 3 and a second jack 4, wherein the second annular top iron is connected to the rear end of the jacking pipe, and the center point of the second annular top iron is on the same horizontal line as the center point of the jacking pipe. There are more than 3 second jacks, which are evenly distributed horizontally and connected between the second annular top iron and the reaction wall of the starting shaft. Further, the second jacks are evenly installed on the second annular base 5, and the second annular base is fixed to the reaction wall of the starting shaft by expansion screws, and the center point of the second annular base is on the same horizontal line as the center point of the jacking pipe. The second jacks are then connected one by one to the second annular top iron. Figure 1 The second jack pushes the second annular jacking iron, thereby applying a jacking force to the jacking pipe and the machine head, so that the machine head and the jacking pipe are pushed toward the ejection hole of the receiving well.

[0034] In this embodiment, a pulling rod 101 is provided at the center of the machine head. Three blades 102 are welded between the pulling rod and the inner wall of the machine head. The blades are made of high-strength steel. The three blades are perpendicular to the inner wall of the machine head and are used to cut the soil while maintaining the stability of the face. The thickness and width of the blades are set according to the strength, rigidity and stability requirements based on the diameter parameters of the machine head. The angle between the two blades at the bottom is 120°-150°, and the upper blade is arranged in the vertical direction to evenly divide the upper space in the machine head. Figure 2 As shown, it is possible to ensure that the face is stable when the machine head is advanced. Specifically, a pulling ring for connecting a steel cable is provided at the center of the front end of the pulling rod.

[0035] The jacking system also includes functional components such as a lighting mechanism and a lubricating mud mechanism. Since these components are conventional technologies, they will not be introduced in detail here.

[0036] In this embodiment, the pulling system includes a sliding flatbed trolley 6, an electric steel cable drum 7, a first annular top iron 8, a first jack 9 and a steel cable 10; a guide rail (not shown in the figure) is installed in the receiving well, and the sliding flatbed trolley is slidably installed on the guide rail and moves horizontally along the axial direction of the jacking pipe. The electric steel cable drum and the first annular top iron are both fixed to the upper surface of the sliding flatbed trolley by bolts. The three form a whole, and the center point of the first annular top iron and the center point of the ejection hole are on the same horizontal line.

[0037] The diameter of the first annular top iron is larger than the diameter of the ejection hole. There are more than three first jacks, which are evenly distributed horizontally and connected between the first annular top iron and the reaction walls around the ejection hole. Specifically, the first jacks are evenly installed on the first annular base 11, which is fixed to the reaction walls around the ejection hole by expansion screws, and the center point of the first annular base is on the same horizontal line as the center point of the ejection hole. The first jacks are then connected one by one to the first annular top iron. Furthermore, an automatic hydraulic jaw 12 is installed at the center point of the annular top iron; a horizontal drill hole is connected between the ejection hole and the ejection hole, and the horizontal drill hole is constructed using a horizontal spiral drilling machine.

[0038] One end of the steel cable is connected to the pulling ring at the center of the front end of the machine head. The other end of the steel cable passes through the automatic hydraulic jaws of the horizontal drill hole, the ejection hole, and the first ring-shaped jacking iron, and then connects to the electric steel cable drum. During the pipe jacking construction equipment, the automatic hydraulic jaws are adjusted to clamp the steel cable, and the first jack pushes against the first ring-shaped jacking iron, applying tension to the steel cable, thereby pulling the machine head and the jacking pipe. Specifically, the steel cable uses different specifications of high-strength steel cables according to the different diameter parameters of the jacking pipe.

[0039] The present invention also provides a construction method for a combined jacking and pulling pipe jacking construction device, comprising the following steps: (1) constructing a starting well and a receiving well according to design requirements, reserving a jacking hole on the side wall of the starting well close to the receiving well, and installing a jacking pipe water-stop embedded part; reserving an ejection hole on the side wall of the receiving well close to the starting well, and grouting the jacking hole and the ejection hole for reinforcement; casting a reaction wall on the side wall opposite to the jacking hole and around the ejection hole as a force-bearing foundation for the jacking system and the pulling system;

[0040] (2) Use a horizontal spiral drill to drill straight from the center of the top hole to the center of the top hole, and drill through the starting well and the receiving well to form a horizontal borehole; at the same time, the horizontal spiral drill collects geological information of the stratum during the drilling process, providing design and construction parameters for subsequent pipe jacking construction;

[0041] (3) Place a steel cable in the starting well, connect one end of the steel cable to the front end of the horizontal auger, and use the horizontal auger to pull one end of the steel cable back to the receiving well;

[0042] (4) Install the pulling system in the receiving well, pass one end of the steel cable through the automatic hydraulic clamp at the center of the first annular top iron, and then connect it to the electric steel cable drum, and control the automatic hydraulic clamp to clamp the steel cable;

[0043] (5) Install the machine head, jacking pipe and jacking system in the launch well, and connect one end of the steel cable in the launch well to the center of the front end of the machine head;

[0044] (6) The jacking system performs jacking construction according to the jacking process. At the same time, the first jack in the traction system pushes the first annular jacking iron, applies tension to the steel cable, pulls the machine head and the jacking pipe, and assists the jacking system in pushing the jacking pipe and the machine head toward the receiving well.

[0045] (7) During the machine head advancement process, after the machine head advances to a depth of 20-40 cm, the two upper soil bodies formed by the three blades are cut ( Figure 2 After the machine head continues to advance to a depth of 20-40cm, the lower piece of soil ( Figure 2 c) in the working condition and the two new upper soil blocks in this working condition are removed, and repeated in sequence, so as to maintain the stability of the tunnel face and avoid soil collapse;

[0046] (8) When installing a new pipe section in the launch well, the jacking system is disconnected and the pulling system continues to maintain the pulling force to keep the soil pressure at the tunnel face greater than the static soil pressure;

[0047] (9) After the new pipe section of the launch well is installed, the jacking system is reconnected to restore the jacking force, the traction system releases the jacking force of the first jack, retracts the jacking stroke of the first jack, releases the automatic hydraulic clamp, turns on the electric cable drum, moves the trolley to the initial position, and then clamps the automatic hydraulic clamp to restore the pulling force of the traction system;

[0048] (10) Repeat steps (6) to (9) until the machine head reaches the receiving well.

Claims

1. A construction method of a top-pull combined pipe jacking construction equipment, characterized in that The following steps are involved: (1) Construct the starting well and receiving well according to the design requirements, reserve a jacking hole on the side wall of the starting well close to the receiving well, and install the jacking pipe water-stop embedded parts; reserve an ejection hole on the side wall of the receiving well close to the starting well, and reinforce the jacking hole and ejection hole by grouting; cast the reaction wall on the side wall opposite to the jacking hole and around the ejection hole; The jacking and pulling combined jacking pipe construction equipment at least includes a machine head, a jacking pipe and a jacking system, wherein the jacking pipe is spliced together by multiple pipe sections, the machine head is installed at the front end of the jacking pipe and is located at the jacking hole of the starting well, and the jacking system is installed at the rear end of the jacking pipe and supported on the reaction wall in the starting well, thereby applying a jacking force to the jacking pipe and the machine head, so that the machine head and the jacking pipe are pushed toward the ejection hole of the receiving well; a pulling system is installed in the receiving well, and the pulling system includes a sliding flatbed car, an electric steel cable drum, a first annular jacking iron, a first jack and a steel cable; a guide rail is installed in the receiving well, and the sliding flatbed car is slidably installed on the guide rail and moves horizontally along the axial direction of the jacking pipe, the electric steel cable drum and the first annular jacking iron are both fixed to the upper surface of the sliding flatbed car, and the center point of the first annular jacking iron and the center point of the ejection hole are on the same horizontal line, the diameter of the first annular jacking iron is larger than the diameter of the ejection hole, and the first jack There are more than 3 tops, which are evenly distributed horizontally and connected between the first annular top iron and the reaction walls around the ejection hole; an automatic hydraulic jaw is installed at the center point of the annular top iron; a horizontal drill hole is connected between the ejection hole and the ejection hole, one end of the steel cable is connected to the center of the front end of the machine head, and the other end of the steel cable passes through the horizontal drill hole, the ejection hole and the automatic hydraulic jaws of the first annular top iron in sequence, and then is connected to the electric steel cable drum. When the jacking construction equipment is under construction, the automatic hydraulic jaw clamps the steel cable, and the first jack pushes the first annular top iron, applying tension to the steel cable, thereby pulling the machine head and the jacking pipe; a pulling rod is provided at the center of the machine head, and three blades are welded between the pulling rod and the inner wall of the machine head. The three blades are all perpendicular to the inner wall of the machine head, and the angle between the two blades at the lower part is 120°-150°. The upper blade is arranged in the vertical direction to evenly divide the upper space inside the machine head; (2) Use a horizontal spiral drill to drill straight from the center of the top hole to the center of the top hole, and drill through the starting well and the receiving well to form a horizontal borehole; at the same time, the horizontal spiral drill collects geological information of the stratum during the drilling process; (3) Place a steel cable in the starting well, connect one end of the steel cable to the front end of the horizontal auger drill, and use the horizontal auger drill to pull one end of the steel cable back to the receiving well; (4) Install the pulling system in the receiving well, pass one end of the steel cable through the automatic hydraulic clamp at the center of the first annular top iron, and then connect it to the electric steel cable drum, and control the automatic hydraulic clamp to clamp the steel cable; (5) Install the machine head, jacking pipe and jacking system in the launch well, and connect one end of the steel cable in the launch well to the center of the front end of the machine head; (6) The jacking system performs jacking construction according to the jacking process. At the same time, the first jack in the traction system pushes the first annular jacking iron, applies tension to the steel cable, pulls the machine head and jacking pipe, and assists the jacking system to push the jacking pipe and machine head toward the receiving well; (7) During the machine head advancement process, after the machine head advances to a depth of 20-40 cm, the two upper soil blocks formed by the cutting of the three blades are removed. After the machine head continues to advance to a depth of 20-40 cm, the lower soil block that was not removed in the previous working condition and the two new upper soil blocks in this working condition are removed, and this process is repeated in sequence. (8) When installing a new pipe section in the launch well, the jacking system is disconnected and the pulling system continues to maintain the pulling force to keep the soil pressure on the tunnel face greater than the static soil pressure; (9) After the new pipe section of the launch well is installed, the jacking system is reconnected to restore the jacking force, and the traction system releases the jacking force of the first jack, retracts the jacking stroke of the first jack, releases the automatic hydraulic clamp, turns on the electric cable drum, moves the trolley to the initial position, and then clamps the automatic hydraulic clamp to restore the pulling force of the traction system; (10) Repeat steps (6) to (9) until the machine head reaches the receiving well.

2. The construction method of the top-pull combined pipe jacking construction equipment according to claim 1, characterized in that: A pulling ring for connecting a steel cable is provided at the center of the front end of the pulling rod.

3. The construction method of the top-pull combined pipe jacking construction equipment according to claim 1, characterized in that: The jacking system includes a second annular jack and a second jack, wherein the second annular jack is connected to the rear end of the jacking pipe, and the center point of the second annular jack and the center point of the jacking pipe are located on the same horizontal line. There are more than three second jacks, which are evenly distributed horizontally and connected between the second annular jack and the reaction wall of the starting well. The second jack pushes the second annular jack, thereby applying jacking force to the jacking pipe and the machine head.

4. The construction method of the jacking and pulling combined pipe jacking construction equipment according to claim 3, characterized in that: The second jacks are evenly installed on the second annular base, and the second annular base is fixed to the reaction wall of the starting well by expansion screws, and the center point of the second annular base and the center point of the jacking pipe are located on the same horizontal line.

5. The construction method of the jacking and pulling combined pipe jacking construction equipment according to claim 1, characterized in that: The electric steel cable drum and the first annular top iron are both fixedly connected to the sliding flatbed vehicle by bolts.

6. The construction method of the jacking and pulling combined pipe jacking construction equipment according to claim 1, characterized in that: The first jacks are evenly installed on the first annular base, which is fixed to the reaction wall around the ejection hole by expansion screws, and the center point of the first annular base and the center point of the ejection hole are on the same horizontal line.

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