Rescue method for boulder in jacking process of pipe jacking machine

Abstract

The invention provides a rescue method for boulders in the jacking process of a tube push bench, which comprises the following steps: a stopping step: stopping the jacking of the tube push bench, and balancing the jacking pressure of the tube push bench with the pressure of a soil layer at the front part of the tube push bench; an excavation step: excavating a receiving channel from the pipe jacking receiving well to the machine head of the pipe jacking machine; a filling step: filling the receiving channel with concrete with preset strength; and a jacking step: after the strength of the concrete reaches the preset strength, starting the pipe jacking machine, and continuously jacking the pipe jacking receiving well. According to the method, the receiving channel is excavated from the pipe jacking receiving well to the machine head of the pipe jacking machine, boulders are broken and removed in the excavation process, the receiving channel is filled with concrete after breaking and removing, an artificial rock-soil layer is formed, the pipe jacking machine can continue to conduct jacking construction conveniently, the engineering amount is reduced, the construction difficulty is lowered, the construction cost is saved, and the construction efficiency is improved. The rescue of the pipe jacking machine is smoothly completed under the conditions that the ground space is not occupied and the external environment is not interfered.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, and in particular to a rescue method for isolated rocks encountered during the jacking process of a pipe jacking machine. Background Art

[0002] Pipe jacking is a trenchless construction method, a pipeline burial construction technology with no excavation or less excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipeline and the surrounding soil, push the pipeline into the soil according to the designed slope, and transport the soil away. After one section of the pipe is pushed into the soil layer, the second section of the pipe is pushed in. The principle is to use the thrust of the main jacking cylinder and the pipeline room, relay room, etc. to push the tool pipe or tunnel boring machine from the working pit through the soil layer to the receiving pit and lift it. The pipeline follows the tool pipe or tunnel boring machine and is buried between the two pits.

[0003] During the process of pipe jacking, when a rock is encountered in the pipe jacking route and cannot be broken through, a deep well is often dug on the ground to lift out the pipe jacking machine head, and then manual excavation is used to complete the subsequent horizontal channel engineering of the pipe jacking. This method requires ground space and a large amount of engineering, especially when the pipe jacking line is at a deeper position, the deep well excavation engineering is large, the support cost is high, and the construction is difficult. In addition, the subsequent manual excavation of the pipe jacking line is difficult, the safety risk is high, and the construction cost is high. Summary of the invention

[0004] In view of this, the present invention proposes a rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine, aiming to solve the problem in the prior art of large amount of engineering work of digging a deep well, hoisting out the machine head and manually excavating subsequent projects when the pipe jacking machine suddenly encounters isolated rocks during jacking.

[0005] The present invention proposes a rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine, and the method comprises the following steps: a stopping step, stopping the jacking of the pipe jacking machine and balancing the jacking pressure of the pipe jacking machine with the pressure of the soil layer in front of the pipe jacking machine; an excavating step, excavating a receiving channel from a jacking pipe receiving well to a head of the pipe jacking machine; a filling step, filling the receiving channel with concrete of a preset strength; and a jacking step, starting the pipe jacking machine after the strength of the concrete reaches the preset strength, and continuing to jack to the jacking pipe receiving well.

[0006] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, the excavation step further includes: a determination sub-step, digging an exit door of the pipe jacking machine in the pipe jacking receiving well; an injection sub-step, injecting a pipe curtain from the exit door to the head of the pipe jacking machine outside the contour line of the head of the pipe jacking machine; and a digging sub-step, excavating a receiving channel from the exit door along the pipe curtain to the head of the pipe jacking machine.

[0007] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, in the application sub-step, the pipe curtain includes: a first connector, a second connector and a third connector connected in sequence; wherein the first connector and the third connector are relatively arranged and are respectively located on the left and right sides of the contour line of the head of the pipe jacking machine, and the second connector is placed between the first connector and the third connector and is located at the top of the contour line of the head of the pipe jacking machine.

[0008] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, the first connector and the second connector are connected by a notch buckle connection; the second connector and the third connector are connected by a notch buckle connection.

[0009] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, in the striking sub-step, the pipe curtain breaks the isolated rocks by vibrating hammers and passes through the isolated rocks; the pipe curtain intersects with the head of the pipe jacking machine and overlaps by a preset distance.

[0010] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, the pipe curtain and the head of the pipe jacking machine overlap by 1.5 to 2.0 m.

[0011] Furthermore, in the rescue method for encountering isolated boulders during the jacking process of the above-mentioned pipe jacking machine, in the excavation sub-step, a mining method is used to excavate a receiving channel, and when isolated boulders are encountered, a mechanical pneumatic pick or static blasting is used to pass through the isolated boulders.

[0012] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, in the filling step, a closed retaining wall is built at the exit of the tunnel, and concrete is injected into the receiving channel through a slurry delivery port reserved on the closed retaining wall.

[0013] Furthermore, in the rescue method for isolated rocks encountered during the jacking process of the above-mentioned pipe jacking machine, the closed retaining wall is built with aerated concrete blocks; the closed retaining wall is flush with the inner wall of the receiving shaft of the pipe jacking machine.

[0014] Furthermore, in the rescue method for encountering isolated rocks during the jacking process of the above-mentioned pipe jacking machine, the concrete is foam concrete.

[0015] In the present invention, the jacking of the pipe jacking machine is first stopped, and the jacking pressure of the pipe jacking machine is balanced with the soil pressure in front of the pipe jacking machine, a receiving channel is excavated from the pipe jacking receiving well to the head of the pipe jacking machine, and boulders are broken during the excavation process, and concrete is filled in the receiving channel after the breaking to form an artificial rock and soil layer. After the strength of the concrete reaches a preset strength, the pipe jacking machine is started to continue to jack to the pipe jacking receiving well. This method does not require digging a deep well from the ground, that is, it does not require occupying ground space, and does not require manual excavation of subsequent remaining horizontal channel projects for jacking pipes, thereby reducing the amount of engineering work, reducing the difficulty of construction, and saving construction costs. It can also ensure construction safety, and realize the smooth completion of the rescue of the pipe jacking machine without occupying ground space and without interfering with the external environment. Even if the pipe jacking line is in a deeper position, this method can be applied, which solves the problem of large engineering work in the prior art of digging a deep well to hoist out the head and manually excavating subsequent projects when the pipe jacking machine suddenly encounters boulders during jacking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0017] Figure 1 A flow chart of a rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of determining sub-steps in a rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the injection sub-step in the rescue method for encountering isolated rocks during the jacking process of the pipe jacking machine provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a filling step in a rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] See also Figure 1 , Figure 1 A flowchart of a rescue method for a solitary rock encountered during the jacking process of a pipe jacking machine provided by an embodiment of the present invention. As shown in the figure, the rescue method for a solitary rock encountered during the jacking process of a pipe jacking machine includes the following steps:

[0023] Stop step S1, stop the jacking of the pipe jacking machine, and balance the jacking pressure of the pipe jacking machine with the soil pressure in front of the pipe jacking machine.

[0024] Specifically, see Figures 2 to 4 The pipe jacking machine 1 starts from the starting well 10 and moves in the jacking direction ( Figure 2 When the pipe jacking machine 1 encounters a boulder 9 that cannot be broken during the jacking process, the jacking of the pipe jacking machine 1 is stopped, the hydraulic cylinder of the pipe jacking machine 1 is adjusted, and the jacking pressure of the pipe jacking machine 1 is always balanced with the soil pressure in front of the pipe jacking machine 1, so that the pipe jacking machine 1 can maintain a safe and stable state when it is stopped and drilled.

[0025] Excavation step S2, excavating a receiving channel from the jacking pipe receiving well to the head of the jacking machine.

[0026] Specifically, see Figures 2 to 4 In the jacking receiving well 3, the position of the exit door 5 of the jacking machine 1 is determined, and a receiving channel 4 is excavated from the position of the exit door 5 to the head 2 of the jacking machine.

[0027] Filling step S3, filling the receiving channel with concrete of a preset strength.

[0028] Specifically, see Figures 2 to 4 , the exit door 5 is blocked, and a slurry delivery port is reserved, and concrete 7 is filled into the receiving channel 4 through the slurry delivery port, so that the concrete 7 fills the entire receiving channel 4. The preset strength of the concrete can be determined according to actual conditions, and this embodiment does not impose any restrictions on this. Preferably, the concrete is foamed concrete. In this embodiment, the concrete is low-strength foamed concrete.

[0029] In the jacking step S4, after the strength of the concrete reaches a preset strength, the pipe jacking machine is started to continue jacking toward the jacking receiving well.

[0030] Specifically, after the strength of the concrete reaches the preset strength, the pipe jacking machine 1 is restarted, so that the pipe jacking machine 1 passes through the closed receiving channel 4 to the pipe jacking receiving well 3, thereby successfully completing the safe rescue of the pipe jacking machine and ensuring the quality and linear accuracy of the pipe jacking.

[0031] It can be seen that in the present embodiment, the jacking of the pipe jacking machine is first stopped, and the jacking pressure of the pipe jacking machine is balanced with the soil pressure in front of the pipe jacking machine, a receiving channel is excavated from the pipe jacking receiving well to the head of the pipe jacking machine, and the isolated rocks are broken during the excavation process, and concrete is filled into the receiving channel after the breaking to form an artificial rock and soil layer. After the strength of the concrete reaches the preset strength, the pipe jacking machine is started to continue to jack to the pipe jacking receiving well. In this method, there is no need to dig a deep well from the ground, that is, there is no need to occupy the ground space, and there is no need to manually excavate the subsequent remaining horizontal channel engineering of the jacking pipe, which reduces the engineering workload, reduces the construction difficulty, saves construction costs, and can also ensure construction safety. It realizes the successful completion of the rescue of the pipe jacking machine without occupying the ground space and without interfering with the external environment. Even if the jacking line is in a deeper position, this method can be applied, which solves the problem of large engineering workload of digging deep wells, hoisting out the machine head and manually excavating subsequent engineering when the pipe jacking machine encounters isolated rocks in the prior art.

[0032] In the above embodiment, the excavation step S2 further includes:

[0033] Determine sub-step S21, dig an exit door of the pipe jacking machine in the pipe jacking receiving shaft.

[0034] Specifically, see Figure 2 The position of the exit door 5 of the pipe jacking machine 1 is pre-set out in the pipe jacking receiving well 3, and the exit door 5 is dug on the side wall of the pipe jacking receiving well 3.

[0035] In the injection sub-step S22, a pipe curtain is injected from the tunnel exit to the head of the pipe jacking machine outside the contour line of the head of the pipe jacking machine.

[0036] Specifically, see Figure 3 The pipe curtain 6 includes: a first connector, a second connector and a third connector. The first connector, the second connector and the third connector are connected in sequence, the first connector and the third connector are arranged opposite to each other, and the first connector and the third connector are respectively located on the left and right sides of the outline of the pipe jacking machine head 2. The second connector is placed between the first connector and the third connector, and the second connector is located at the top of the outline of the pipe jacking machine head. In this way, the first connector, the second connector and the third connector are connected to form a "hat-shaped" pipe curtain.

[0037] Preferably, the first connector and the second connector are connected via a notch buckle connection, and the second connector and the third connector are also connected via a notch buckle connection.

[0038] See also Figure 3The pipe curtain 6 is horizontally applied from the tunnel exit 5 to the head 2 of the pipe jacking machine, and the pipe curtain 6 breaks the isolated rocks 9 and passes through the isolated rocks 9 by vibrating hammers. The pipe curtain 6 is located outside the head 2 of the pipe jacking machine 1, and the pipe curtain 6 intersects with the head 2 of the pipe jacking machine, and the pipe curtain 6 overlaps with the head 2 of the pipe jacking machine by a preset distance. Preferably, the pipe curtain 6 overlaps with the head 2 of the pipe jacking machine by 1.5 to 2.0 m.

[0039] In the digging sub-step S23, a receiving channel is excavated from the tunnel exit along the pipe curtain to the head of the pipe jacking machine.

[0040] Specifically, see Figure 3 , the receiving channel 4 is excavated from the jacking receiving shaft 3 along the injected pipe curtain 6 by the mining method, wherein the mining method uses the primary support structure of steel truss + shotcrete to excavate the receiving channel 4, and the inner contour line of the primary support structure is outside the outer contour line of the jacking machine head 2, so the primary support structure does not conflict with the pipeline of the jacking machine 1. When encountering a boulder 9 during the excavation of the receiving channel 4, a mechanical pneumatic pick or static blasting is used to pass through the boulder 9 until the boulder 9 is completely excavated and passed, thereby forming a smooth receiving channel 4.

[0041] It can be seen that in this embodiment, the excavation process is simple and easy to operate.

[0042] In the above-mentioned embodiments, in the filling step S3, a closed retaining wall is built at the tunnel exit, and concrete is injected into the receiving channel through a grouting port reserved on the closed retaining wall.

[0043] Specifically, see Figure 4 In the jacking receiving well 3, a closed retaining wall 8 is built at the exit 5 with aerated concrete blocks, and the closed retaining wall 8 is flush with the inner wall of the jacking receiving well. In addition, a concrete pumping pipe hole is left at the top position of the closed retaining wall 8 as a slurry delivery port for subsequent filling of concrete 7.

[0044] Utilize the grout delivery port reserved on the closed retaining wall 8 to inject concrete 7 of preset strength into the receiving channel 4, so that the concrete 7 fills the entire receiving channel 4, that is, the concrete 7 fills the space between the pipe jacking machine 1 and the closed retaining wall 8, to ensure that the line position of the pipe jacking machine head 2 and the pipe jacking section is accurate, the jacking is continuous, safe, smooth and without deviation during subsequent pipe jacking. After pouring, close the grout delivery port.

[0045] In summary, in this embodiment, a pipe curtain is injected into the jacking receiving well to pass through the isolated rocks to the head of the jacking machine, a receiving channel is excavated from the jacking receiving well by the mining method, the obstructing isolated rocks are removed, and finally concrete is injected into the receiving channel through the slurry delivery port reserved on the closed retaining wall at the exit of the tunnel to fill the closed receiving channel to form an artificial rock and soil layer, and then the jacking machine is restarted to start normal jacking construction to the jacking receiving well. This method utilizes the jacking receiving well, adopts the pipe curtain to break rocks and clear obstacles, and excavates the receiving channel and then fills it with concrete to form an artificial rock and soil layer for rescue, which is convenient for the continued operation of the jacking machine. Continued jacking does not require digging a deep well from the ground, that is, there is no need to occupy ground space, and there is no need to manually excavate the remaining horizontal channel projects for subsequent jacking pipes. This reduces the amount of work, reduces the difficulty of construction, saves construction costs, and ensures construction safety. It achieves the rescue of the jacking machine without occupying ground space and interfering with the external environment. This method can increase the construction speed, ensure the integrity, continuity and smoothness of the jacking sections of the entire jacking line, and achieve smooth jacking construction of the entire jacking line and the entire process. This method is applicable even if the jacking line is in a deeper position.

[0046] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A rescue method for encountering isolated rocks during the jacking process of a pipe jacking machine, characterized in that: The steps include: A stopping step is to stop the jacking of the pipe jacking machine and balance the jacking pressure of the pipe jacking machine with the soil pressure in front of the pipe jacking machine; The excavation step is to excavate a receiving channel from the jacking pipe receiving well to the head of the jacking machine; A filling step, filling the receiving channel with concrete of a preset strength; The jacking step is to start the pipe jacking machine after the strength of the concrete reaches a preset strength, and continue to jack the pipe toward the jacking receiving well.

2. The rescue method for encountering isolated rocks during the jacking process of the pipe jacking machine according to claim 1 is characterized in that: The excavation step further comprises: Determine the sub-step, dig the exit door of the pipe jacking machine in the pipe jacking receiving well; The application sub-step is to apply a pipe curtain from the tunnel exit to the head of the pipe jacking machine outside the outline of the head of the pipe jacking machine; The digging sub-step is to dig the receiving channel from the tunnel exit along the pipe curtain to the head of the pipe jacking machine.

3. The rescue method for encountering isolated rocks during the jacking process of the pipe jacking machine according to claim 2 is characterized in that: In the injecting sub-step, The pipe curtain includes: a first connector, a second connector and a third connector connected in sequence; wherein the first connector and the third connector are arranged opposite to each other and are respectively located on the left and right sides of the outline of the head of the pipe jacking machine, and the second connector is placed between the first connector and the third connector and is located at the top of the outline of the head of the pipe jacking machine.

4. The rescue method for isolated rocks encountered during the jacking process of the pipe jacking machine according to claim 3 is characterized in that: The first connector and the second connector are connected by buckling through a notch; The second connecting body and the third connecting body are connected via notch buckling.

5. The rescue method for encountering isolated rocks during the jacking process of the pipe jacking machine according to claim 2 is characterized in that: In the injecting sub-step, The tube curtain breaks up the isolated rocks by vibrating hammers and passes through the isolated rocks; The pipe curtain intersects with the head of the pipe jacking machine and overlaps with a preset distance.

6. The rescue method for isolated rocks encountered during the jacking process of the pipe jacking machine according to claim 5 is characterized in that: The pipe curtain and the head of the pipe jacking machine overlap by 1.5 to 2.0 m.

7. The rescue method for encountering isolated rocks during the jacking process of the pipe jacking machine according to claim 2 is characterized in that: In the excavation sub-step, The receiving channel is excavated by a mining method, and when a lone rock is encountered, a mechanical pneumatic pick or static blasting is used to pass through the lone rock.

8. The rescue method for isolated rocks encountered during the jacking process of the pipe jacking machine according to claim 2 is characterized in that: In the filling step, A closed retaining wall is built at the tunnel exit, and the concrete is injected into the receiving channel through a slurry delivery port reserved on the closed retaining wall.

9. The rescue method for isolated rocks encountered during the jacking process of the pipe jacking machine according to claim 8, characterized in that: The closed retaining wall is built with aerated concrete blocks; The closed retaining wall is flush with the inner wall of the pipe jacking machine receiving well.

10. The rescue method for isolated rocks encountered during the jacking process of the pipe jacking machine according to claim 1, characterized in that: The concrete is foamed concrete.

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