Method for trenchless construction using anti-recession device

Abstract

The present invention belongs to the technical field of tunnel construction, and discloses a method for trenchless construction using a backstop device, including installing the backstop device on adjacent pipe sections and a stressed top iron, and a jacking device driving the force-applying top iron to abut against the stressed top iron; the jacking device contracts, the backstop device extends, and the track clamp is pressed against the pipe section; the stressed top iron is removed, and a pipe section to be installed is placed between the pipe section and the force-applying top iron, the backstop device is installed on the pipe section and the pipe section to be installed, and the track clamp is taken out; the jacking device extends, the backstop device contracts, the pipe section to be installed abuts against and pushes the pipe section, and the track clamp is pressed against the force-applying top iron; the jacking device contracts, the force-applying top iron is converted into the force-applying top iron, a force-applying top iron is re-placed, the backstop device is installed on the force-applying top iron and the force-applying top iron, and the track clamp is taken out; the jacking device extends, the backstop device contracts, and the force-applying top iron is converted into the force-applying top iron, and a force-applying top iron is re-placed, the backstop device is installed on the force-applying top iron and the force-applying top iron, and the track clamp is taken out; the jacking device extends, the backstop device contracts, until the force-applying top iron abuts against the force-applying top iron. The present invention avoids the backward movement of the pipe section or the top iron by synchronously extending and retracting the backstop device and the jacking device.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a method for performing trenchless construction using a backstop device. Background Art

[0002] The pipe jacking method is to overcome the friction between the pipe and the surrounding soil in the working pit by using the jacking force generated by the jacking equipment, push the pipe into the soil according to the designed slope, and transport the soil away. The principle is that after one section of the pipe is pushed into the soil layer, the second section of the pipe is pushed in, and the tool pipe or the tunnel boring machine is pushed through the soil layer from the working pit to the receiving pit and lifted by the thrust of the main jacking cylinder and the pipeline room and relay room. The pipeline is buried between the two pits following the tool pipe or tunnel boring machine, so as to achieve trenchless construction.

[0003] During the construction of the pipe jacking method, especially when adding pipe sections, after the first section of the pipe jacking is pushed to the predetermined position in the soil layer, the hydraulic device or the main jacking cylinder and other devices that apply thrust will retract to prepare for the advancement of the next section of the pipe jacking. In this process, the first section of the pipe jacking loses thrust and is subjected to a large pressure from the front soil. Under the action of active soil pressure, the friction resistance between the pipe body and the soil is not enough to withstand the soil pressure, and it is easy to retreat. Under general geological conditions, the retreat of the pipe jacking will cause the soil layer in front to collapse, further leading to ground subsidence, seriously endangering the ground structure, and causing major safety hazards.

[0004] Therefore, in the prior art, steel plates or steel bars are welded on the wall of the starting shaft and the pipe section as temporary anti-recoil devices, or reaction frames are designed to block the pipe sections, and grooves are opened on the guide rails for limiting and fixing. However, the welded steel plates or steel bars cannot be removed, which affects subsequent operations. The setting of reaction frames and grooves cannot prevent the pipe section from retreating due to the retreat of the top iron during the process of adding the top iron. Therefore, the design of anti-recoil devices between pipe sections, between pipe sections and top irons, and between top irons is essential, and the operating method for preventing retreat also needs to be strictly set to ensure both work efficiency and minimize the occurrence of retreat. Summary of the invention

[0005] The purpose of the present invention is to provide a method for non-excavation construction using a retreat-stopping device, so as to ensure that the distances between pipe sections, pipe sections and top irons, and top irons remain relatively unchanged during the non-excavation process, thereby avoiding the retreat of pipe sections or top irons.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A method for trenchless construction using a backstop device, comprising:

[0008] Step S1, installing the two ends of the anti-retraction device on the adjacent pipe section and the force-bearing top iron respectively, and the pushing device drives the force-applying top iron to abut against the force-bearing top iron;

[0009] Step S2, the pushing device is contracted along the axial direction of the pipe segment, the backstop device is extended along the axial direction of the pipe segment, and the rail clamp is installed on the track between the pipe segment and the force-bearing jacking iron to abut against the pipe segment;

[0010] Step S3, remove one end of the anti-retraction device from the force-bearing top iron, remove the force-bearing top iron, place the pipe section to be installed between the pipe section and the force-applying top iron, install the two ends of the anti-retraction device on the pipe section and the pipe section to be installed respectively, and take out the rail clamp;

[0011] Step S4, the jacking device extends along the axial direction of the pipe segment, the stop device contracts along the axial direction of the pipe segment, the pipe segment to be installed abuts against and pushes the pipe segment, and the rail clamp is installed on the track on the side of the force-applying jacking iron facing the jacking device, abutting against the force-applying jacking iron;

[0012] Step S5, the jacking device is contracted along the axial direction of the pipe section, the force-applying jacking iron is transformed into the force-receiving jacking iron, a new force-applying jacking iron is placed between the force-receiving jacking iron and the jacking device, the two ends of the stop device are respectively installed on the force-applying jacking iron and the force-receiving jacking iron, and the rail clamp is taken out;

[0013] Step S6, the pushing device extends along the axial direction of the pipe section, and the back-stopping device contracts along the axial direction of the pipe section until the force-applying push iron abuts against the force-receiving push iron.

[0014] Optionally, step S2 includes:

[0015] Step S2.1, the pushing device contracts, pulling the force-applying push iron away from the pipe section, the stop device extends synchronously, pushing the force-bearing push iron away from the pipe section, and the force-applying push iron and the force-bearing push iron abut against each other and move synchronously;

[0016] Step S2.2, the pushing device stops contracting, and the anti-retraction device stops extending;

[0017] Step S2.3, install the rail clamp on the rail between the pipe section and the load-bearing top iron, against the pipe section.

[0018] Optionally, step S3 includes:

[0019] Step S3.1, remove one end of the stop device from the force-bearing top iron, remove the force-bearing top iron, and then place the pipe section to be installed against the force-applying top iron;

[0020] Step S3.2, installing the anti-retraction device on the pipe section to be installed;

[0021] Step S3.3, remove the rail clamp from the rail.

[0022] Optionally, step S4 includes:

[0023] Step S4.1, the jacking device extends to push the force-applying jacking iron toward the pipe segment, the backstop device contracts synchronously, pulls the pipe segment to be installed toward the pipe segment, and the pipe segment to be installed and the force-applying jacking iron abut against each other and move synchronously;

[0024] Step S4.2, when the pipe section to be installed abuts against the pipe section, the pushing device continues to extend until the pipe section to be installed is pushed forward by a set distance;

[0025] Step S4.3, install the rail clamp on the rail on the side of the force-applying jack iron facing the jacking device, against the force-applying jack iron.

[0026] Optionally, step S5 includes:

[0027] Step S5.1, remove the stop device from the pipe section and the pipe section to be installed, shrink the jacking device, transform the force-applying jacking iron into a force-bearing jacking iron, and re-place a force-applying jacking iron between the force-bearing jacking iron and the jacking device;

[0028] Step S5.2, installing the two ends of the anti-retraction device on the force-applying top iron and the force-receiving top iron respectively;

[0029] Step S5.3, remove the rail clamp from the rail.

[0030] Optionally, step S6 includes:

[0031] Step S6.1, the pushing device extends to push the force-applying top iron toward the force-receiving top iron, and the backstop device contracts synchronously and pulls the force-applying top iron;

[0032] Step S6.2: When the force-applying jacking iron abuts against the force-receiving jacking iron, the jacking device stops extending and the stop device stops contracting.

[0033] Optionally, the anti-retraction device includes a balancing member and a limiting member, two limiting members are provided, and one limiting member is connected to each end of the balancing member.

[0034] Optionally, limiting holes are provided on the pipe joint, the pipe joint to be installed, the force-applying top iron and the force-bearing top iron, and the anti-retraction device can be inserted into the limiting hole.

[0035] Optionally, the pushing device and the stopping device both include jacks.

[0036] As an option, the pipe section, the pipe section to be installed, the force-applying jack iron, the force-bearing jack iron and the rail clamp are all arranged on the track.

[0037] Beneficial effects of the present invention:

[0038] The anti-retreat device can limit and fix the pipe sections and top irons during the trenchless construction process to ensure that the distances between pipe sections, pipe sections and top irons, and top irons do not change, and can extend and retract synchronously with the jacking device without affecting the position change of the pipe sections or top irons, thus avoiding the retreat of the pipe sections or top irons. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the operation of the anti-retraction device according to the first embodiment of the present invention when it is limited in the top iron and the pipe section and is in a contracted state;

[0040] Figure 2 It is a schematic diagram of the operation of the anti-retraction device according to the first embodiment of the present invention when it is limited in the top iron and the pipe section and is in an extended state;

[0041] Figure 3 is a schematic diagram of the anti-retraction device according to the first embodiment of the present invention in a non-working state;

[0042] Figure 4 It is a schematic diagram of the operation of the anti-retraction device according to the first embodiment of the present invention when it is limited in two pipe sections and in an extended state;

[0043] Figure 5 This is a schematic diagram of the operation of the anti-retraction device according to the first embodiment of the present invention when it is limited in two pipe sections and is in a contracted state;

[0044] Figure 6 is a structural diagram of the embodiment 1 of the present invention when the anti-retraction device is removed;

[0045] Figure 7 It is a schematic diagram of the working state of the anti-retraction device according to the first embodiment of the present invention when it is limited between two top irons and in an extended state;

[0046] Figure 8 This is a structural diagram of the anti-retraction device according to the first embodiment of the present invention after the operation is completed;

[0047] Fig. 9 It is a schematic diagram of the overall steps of the method for performing trenchless construction using a backstop device according to the second embodiment of the present invention;

[0048] Fig.10 is a schematic diagram of step S2 of the method for performing trenchless construction using a retreat-stopping device according to the second embodiment of the present invention;

[0049] Fig.11 is a schematic diagram of step S3 of the method for performing trenchless construction using a retreat-stopping device according to the second embodiment of the present invention;

[0050] Fig.12 is a schematic diagram of step S4 of the method for performing trenchless construction using a backstop device according to the second embodiment of the present invention;

[0051] Fig.13 is a schematic diagram of step S5 of the method for performing trenchless construction using a retreat-stopping device according to the second embodiment of the present invention;

[0052] Fig.14 It is a schematic diagram of step S6 of the method for performing trenchless construction using a retreat-stopping device according to the second embodiment of the present invention.

[0053] In the figure:

[0054] 100- pipe joint; 101- starting well wall; 102- building gap; 103- formation; 104- track; 201- top iron; 202- jacking device; 203- rear seat top iron; 300- track clamp; 10- limit component; 11- support seat; 12- positioning pin; 13- connection seat; 20- balance support. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0056] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In the process of trenchless construction using the jacking method, when adding pipe segments or jacking irons to prepare for the jacking of the rear end, the front section of the jacking pipe loses its thrust and needs to withstand a large pressure from the front soil. The friction resistance between the pipe body and the soil is not enough to withstand the soil pressure, which will cause the jacking pipe to retreat. Under general geological conditions, the retreat of the jacking pipe will cause the soil in front to collapse, further leading to ground subsidence and causing major safety hazards. Therefore, the design of anti-retreat devices between pipe segments, between pipe segments and jacking irons, or between jacking irons is essential.

[0059] Embodiment 1

[0060] The technical solution of this embodiment is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0061] like Figure 1-Figure 8 As shown, this embodiment provides a backstop device, including two limiting components 10 and a balancing support 20. The limiting component 10 includes a supporting seat 11 and a positioning pin 12 connected to each other, a positioning hole is provided on the positioning support structure, and the positioning support structure is a pipe joint 100 or a top iron 201. The two limiting components 10 can be respectively locked on two adjacent positioning support structures by inserting the positioning pin 12 and the positioning hole.

[0062] In this embodiment, the axis of the balancing support member 20 is parallel to the output end direction of the jacking device 202 in the starting well, and the balancing support member 20 is clamped between two limiting components 10. When the output end of the jacking device 202 contracts, the balancing support member 20 can extend synchronously, and when the output end of the jacking device 202 extends, the balancing support member 20 can contract synchronously.

[0063] Thus, the positioning pins 12 on the limiting components 10 can be inserted into the positioning holes on the pipe joint 100 or the top iron 201, respectively, so that the pipe joint 100 and / or the top iron 201 can be used detachably and can also be used to limit and fix the pipe joint 100 and / or the top iron 201, so as to ensure that the distance between the pipe joints 100 and the pipe joints 100, between the pipe joints 100 and the top iron 201, and between the top iron 201 and the top iron 201 does not change, thus avoiding the retreat of the pipe joint 100 or the top iron 201. The balancing support 20 is sandwiched between the limiting components 10, and can be extended and retracted synchronously with the jacking device 202 in the starting well without affecting the position change of the pipe joint 100 or the top iron 201.

[0064] The overall structure of the anti-retreat device of this embodiment is described below.

[0065] like Figure 1As shown, a building gap 102 is set between the strata 103, and the pipe section 100 and the top iron 201 are respectively set on the track 104. Under the thrust of the jacking device 202, they are pushed from the inner side of the starting well wall 101 to between the strata 103 until they reach the target position. The jacking device 202 is provided with a jacking jack, one end of which is fixedly connected to the rear seat top iron 203, and the other end is connected to the top iron 201. Under the stable support of the rear seat top iron 203, the jacking jack pushes the top iron 201 to move on the track 104 to push the adjacent pipe section 100 to move, thereby completing the trenchless construction operation.

[0066] In this embodiment, the backstop device includes a limiting component 10 and a balancing support 20. Optionally, the pipe section 100 or the top iron 201 is configured as a positioning support structure, and a positioning hole is provided on the positioning support structure, that is, the pipe section 100 or the top iron 201 is provided with a positioning hole, and two limiting components 10 are inserted into the positioning holes and can be limited and locked on two adjacent positioning support structures.

[0067] Furthermore, in this embodiment, a track clamp 300 is also configured. After the anti-retraction device limits and fixes the positioning support structure, the track clamp 300 is installed on the track 104 close to the positioning support structure to further limit and fix the positioning support structure to prevent it from retreating.

[0068] Specifically, when two limiting components 10 are respectively inserted into the positioning holes of two pipe sections 100, two top irons 201 or one pipe section 100 and one top iron 201, they are locked on the adjacent pipe sections 100 and / or top irons 201 by limiting.

[0069] Furthermore, the balancing support member 20 is disposed between the two limiting components 10, and the axis of the balancing support member 20 is disposed parallel to the output end direction of the jacking device 202. When the output end of the jacking device 202 contracts and pulls the top iron 201 toward the rear seat top iron 203, the balancing support member 20 can extend synchronously.

[0070] Likewise, when the output end of the jacking device 202 is extended to push the top iron 201 to move away from the rear seat top iron 203, the balance support member 20 can be contracted synchronously.

[0071] Specifically, when the two limiting components 10 are respectively inserted into the positioning holes of the two pipe sections 100, the balancing support 20 connects the two limiting components 10 to keep the relative positions between the two limiting components 10 and the corresponding inserted pipe sections 100 from changing due to the position change of the output end of the pushing device 202.

[0072] Similarly, when two limiting components 10 are inserted into the positioning holes of two top irons 201 or one pipe section 100 and one top iron 201, the balancing support 20 can ensure that the relative positions of the two limiting components 10 in the corresponding top irons 201 or pipe section 100 and top iron 201 are not changed by the position change of the output end of the jacking device 202. In this way, after the jacking device 202 stops applying force, the position of the pipe section 100 or the top iron 201 is prevented from sliding and the position is prevented from being offset, thereby achieving the stop.

[0073] Optionally, rails 104 are provided on both sides of the pipe section 100 or the top iron 201, and positioning holes are provided on the side close to the rails 104. Two limiting components 10 are provided as a group, and a balancing support 20 is sandwiched between each group of limiting components 10. Each group of limiting components 10 is correspondingly inserted into the positioning hole on one side of the pipe section 100 or the top iron 201, that is, each pipe section 100 or the top iron 201 is provided with a group of limiting components 10 on both sides, so as to achieve double-sided limiting and improve stability.

[0074] Specifically, during the manufacturing process of the pipe joint 100 and the top iron 201, holes are reserved at the bottom of the inner arc surface of the pipe joint 100 and the top iron 201 as positioning holes, so that when the pipe joint 100 or the top iron 201 is placed on the track 104, the positioning holes are set on the side close to the track 104, which is convenient for the insertion of the limiting component 10.

[0075] Specifically, Figure 2 As shown, the limiting component 10 includes a supporting seat 11 , a positioning pin 12 and a connecting seat 13 .

[0076] In this embodiment, the support seat 11 and the positioning pin 12 are connected to each other. The positioning pin 12 is configured to be inserted into the positioning hole, and the two limiting components 10 are respectively locked on two adjacent positioning support structures through the insertion of the positioning pin 12 and the positioning hole. In other embodiments, other insertion structures can also be selected.

[0077] Optionally, the limiting component 10 includes a plurality of positioning pins 12, and a plurality of positioning holes are provided on the positioning support structure. The plurality of positioning pins 12 are arranged in parallel and spaced apart on the support seat 11. The distance between two adjacent positioning pins 12 is the same as the distance between two adjacent positioning holes, and the outer diameter of the positioning pin 12 is smaller than the inner diameter of the positioning hole, so as to ensure that each positioning pin 12 can be inserted into each positioning hole one by one.

[0078] Furthermore, the length of the positioning pin 12 is not greater than the depth of the positioning hole, so that the connection between the limiting component 10 and the pipe joint 100 or the top iron 201 is more stable.

[0079] like Figure 3 As shown, the support seat 11 includes a bottom support plate, an abutment plate and a vertical support plate.

[0080] Optionally, the bottom support plate and the abutment plate are vertically connected to each other, and the positioning pin 12 is connected to the bottom support plate, and the balance support member 20 is detachably connected to the abutment plate. In this embodiment, the bottom support plate and the abutment plate are set as steel plates of a certain width, and the bottom support plate and the abutment plate are connected by welding to improve the connection stability.

[0081] In this embodiment, the vertical support plate is vertically connected to the bottom support plate and the abutment plate, and the bottom support plate and the abutment plate are respectively located at two adjacent sides of the vertical support plate. The provision of the vertical support plate not only improves the connection strength between the bottom support plate and the abutment plate, but also makes the overall stability of the limiting component 10 higher. When the limiting component 10 is inserted into the positioning hole for operation, the vertical support plate ensures that the overall force of the device is uniform, avoiding falling off from the positioning hole and causing a greater safety accident.

[0082] Furthermore, the end corners of the vertical support plate away from the bottom support plate and the abutment plate are chamfered. When the two limiting components 10 are arranged facing each other, the operator can simply and quickly determine the placement direction of the limiting component 10 through the chamfer, reducing the installation time of the device and improving work efficiency.

[0083] Optionally, a reinforcing bar is fixedly connected to the connection between the vertical support plate and the bottom support plate to further strengthen the connection strength between the vertical support plate and the bottom support plate to prevent the bottom support plate from detaching from the vertical support plate.

[0084] Similarly, reinforcing bars are also fixed at the connection between the vertical support plate and the abutment plate to further strengthen the connection strength between the vertical support plate and the abutment plate, thereby preventing the abutment plate from detaching from the vertical support plate under the pulling force of the balance support member 20 .

[0085] In this embodiment, the connection seat 13 is connected to the support seat 11, and is configured to be detachably connected to the balance support member 20. Specifically, the connection seat 13 is fixed to the abutment plate of the support seat 11. During the use of the device, the connection seats 13 of the two limiting components 10 are arranged facing each other, and the two ends of the balance support member 20 are detachably connected to the two connection seats 13, so that the balance support member 20 is sandwiched between the two limiting components 10 to support the adjacent positioning support structure.

[0086] Optionally, the limiting component 10 also includes a connecting shaft, a connecting hole is provided on the connecting seat 13, and a disassembly hole is provided on the balancing support 20, and the connecting shaft is inserted into the connecting hole and the disassembly hole to achieve connection between the balancing support 20 and the connecting seat 13.

[0087] Specifically, each limiting component 10 includes two connecting seats 13, and the two connecting seats 13 are fixedly connected to the abutment plate of the support seat 11 in parallel and at intervals. The connecting shaft is sequentially passed through the connecting holes of the two connecting seats 13 and the disassembly hole of the balance support member 20, and is mounted on the two connecting seats 13, so that the balance support member 20 extends between the two connecting seats 13.

[0088] In this embodiment, the balance support 20 is configured to be rotatably connected to the connection seat 13. When the device is in use, it can be adjusted by rotating the balance support 20. The balance support 20 is detachably connected to the connection seat 13, so that the device can be stored and maintained separately, reducing the operating cost.

[0089] like Figure 4 As shown, the balancing support member 20 includes a jack. The jack includes a supporting body and connecting parts at both ends. The connecting parts are provided with disassembly holes, and the connecting shaft of the limiting component 10 is rotatably connected in the disassembly holes to realize the rotatable connection between the jack and the limiting component 10, which is convenient for adjustment.

[0090] The length of the supporting body of the jack is adjustable, so that the length can be changed synchronously with the jacking jack in the jacking device 202, ensuring that the position of the adjacent positioning support structure is not affected.

[0091] Embodiment 2

[0092] This embodiment provides a method for trenchless construction using a retreat-stopping device, using the retreat-stopping device in Embodiment 1, wherein components identical or corresponding to those in Embodiment 1 are marked with corresponding reference numerals in Embodiment 1.

[0093] Specifically, Figure 9-Figure 14 As shown, the method for trenchless construction using the anti-recessing device of this embodiment mainly includes:

[0094] Step S1, installing the two ends of the anti-retraction device on the adjacent pipe section 100 and the force-bearing top iron respectively, and the pushing device 202 drives the force-applying top iron to abut against the force-bearing top iron;

[0095] Step S2, the pushing device 202 is contracted along the axial direction of the pipe section 100, the backstop device is extended along the axial direction of the pipe section 100, and the rail clamp 300 is installed on the track 104 between the pipe section 100 and the force-bearing jacking iron to abut against the pipe section 100;

[0096] Step S3, remove one end of the anti-retraction device from the force-bearing top iron, remove the force-bearing top iron, place the pipe section to be installed between the pipe section 100 and the force-applying top iron, install the two ends of the anti-retraction device on the pipe section 100 and the pipe section to be installed respectively, and take out the rail clamp 300;

[0097] Step S4, the jacking device 202 is extended along the axial direction of the pipe section 100, the stop device is contracted along the axial direction of the pipe section 100, the pipe section to be installed abuts against and pushes the pipe section 100, and the rail clamp 300 is installed on the rail 104 on the side of the force-applying jacking iron facing the jacking device 202, abutting against the force-applying jacking iron;

[0098] Step S5, the jacking device 202 is contracted along the axial direction of the pipe section 100, the force-applying jacking iron is transformed into the force-receiving jacking iron, a new force-applying jacking iron is placed between the force-receiving jacking iron and the jacking device 202, the two ends of the stop device are respectively installed on the force-applying jacking iron and the force-receiving jacking iron, and the rail clamp 300 is taken out;

[0099] Step S6, the pushing device 202 extends along the axial direction of the pipe section 100, and the back-stopping device contracts along the axial direction of the pipe section 100 until the force-applying push iron abuts against the force-receiving push iron.

[0100] In this way, the anti-retraction device is used to limit and fix the pipe segment 100 and the top iron 201 during the trenchless construction process, ensuring that the distances between the pipe segments 100 and the pipe segments 100, the pipe segments 100 and the top iron 201, and the top iron 201 and the top iron 201 do not change, and the anti-retraction device can be extended and retracted synchronously with the jacking device 202 without affecting the position change of the pipe segment 100 or the top iron 201, thereby avoiding the backward movement of the pipe segment 100 or the top iron 201.

[0101] Specifically, Fig.10 As shown, step S2 includes:

[0102] Step S2.1, the pushing device 202 contracts, pulling the force-applying push iron away from the pipe section 100, and the stop device extends synchronously, pushing the force-receiving push iron away from the pipe section 100, and the force-applying push iron and the force-receiving push iron abut against each other and move synchronously;

[0103] Step S2.2, the pushing device 202 stops contracting, and the anti-retraction device stops extending;

[0104] Step S2.3: Install the rail clamp 300 on the rail 104 between the pipe section 100 and the load-bearing top iron, against the pipe section 100 .

[0105] The push device 202 and the backstop device are retracted synchronously, so that the force-applying push iron and the force-receiving push iron can move synchronously, and the position of the pipe section 100 is ensured to remain unchanged through the connection of the backstop device, and it is not easy to retreat. The rail clamp 300 abuts against the pipe section 100, so that when the backstop device is subsequently removed, the position of the pipe section 100 remains unchanged.

[0106] Furthermore, if Fig.11 As shown, step S3 includes:

[0107] Step S3.1, remove one end of the stop device from the force-bearing top iron, remove the force-bearing top iron, and then place the pipe section to be installed against the force-applying top iron;

[0108] Step S3.2, installing the anti-retraction device on the pipe section to be installed;

[0109] Step S3.3, taking the rail clamp 300 out from the rail 104.

[0110] The anti-retraction device is re-placed on the pipe section 100 and the pipe section to be installed to ensure that the relative positions of the pipe section 100 and the pipe section to be installed do not change after the rail clamp 300 is removed.

[0111] like Fig.12 As shown, step S4 includes:

[0112] Step S4.1, the jacking device 202 extends, pushing the force-applying jacking iron to move toward the pipe segment 100, and the backstop device contracts synchronously, pulling the pipe segment to be installed to move toward the pipe segment 100, and the pipe segment to be installed and the force-applying jacking iron abut against each other and move synchronously;

[0113] Step S4.2, when the pipe section to be installed abuts against the pipe section 100, the pushing device 202 continues to extend until the pipe section to be installed is pushed forward by a set distance;

[0114] Step S4.3, install the rail clamp 300 on the rail 104 on the side of the force-applying jack iron facing the jacking device 202, against the force-applying jack iron.

[0115] The jacking device 202 and the anti-retraction device are retracted synchronously to achieve synchronous movement of the force-applying jack and the pipe segment to be installed, and through the connection of the anti-retraction device, the position of the pipe segment 100 is guaranteed to remain unchanged and it is not easy to retreat.

[0116] When the pipe section to be installed abuts against the pipe section 100, the stopper is limited on the pipe section to be installed and the pipe section 100 and cannot continue to shrink. The jacking device 202 continues to extend, and the force-applying jacking iron applies force to the pipe section to be installed, so that the pipe section to be installed, the stopper and the pipe section 100 move together along the circumferential direction of the pipe section 100, thereby realizing the forward movement of the entire equipment in the soil layer, transporting more soil and getting closer to the receiving pit. Optionally, the set distance can be adjusted as needed.

[0117] The rail clamp 300 abuts against the pipe section 100, so that when the jacking device 202 no longer applies thrust to the force-applying jacking iron, the position of the force-applying jacking iron remains unchanged, thereby ensuring that the position of the pipe section 100 and the pipe section to be installed are not affected.

[0118] Furthermore, if Fig.13 As shown, step S5 includes:

[0119] Step S5.1, remove the stopper from the pipe section 100 and the pipe section to be installed, shrink the jacking device 202, transform the force-applying jacking iron into a force-bearing jacking iron, and replace a force-applying jacking iron between the force-bearing jacking iron and the jacking device 202;

[0120] Step S5.2, installing the two ends of the anti-retraction device on the force-applying top iron and the force-receiving top iron respectively;

[0121] Step S5.3: remove the rail clamp 300 from the rail 104 .

[0122] The backstop device is re-placed on the force-applying top iron and the force-receiving top iron to ensure that the relative positions of the force-applying top iron and the force-receiving top iron do not change after the rail clamp 300 is removed. At the same time, the advancement of multiple pipe sections 100 is achieved only by switching the two top irons between the force-applying position and the force-receiving position, which not only improves the overall work efficiency, but also saves the operation cost. After the top irons are recycled and sorted, they can be reused, and the construction cost is reduced.

[0123] Furthermore, if Fig.14 As shown, step S6 includes:

[0124] Step S6.1, the pushing device 202 extends to push the force-applying top iron toward the force-receiving top iron, and the backstop device contracts synchronously and pulls the force-applying top iron;

[0125] Step S6.2: When the force-applying jacking iron abuts against the force-receiving jacking iron, the jacking device 202 stops extending and the stop device stops contracting.

[0126] Similarly, the jacking device 202 and the stop device shrink synchronously to achieve uniform movement of the force-applying jack iron, and through the connection of the stop device, the position of the force-applying jack iron is guaranteed to remain unchanged, thus avoiding the backward movement of the pipe section to be installed and the pipe section 100.

[0127] After the force-applying top iron abuts against the force-receiving top iron, the pipe segment to be installed is transformed into the pipe segment 100, thereby repeating the operations of steps S1 to S6 to achieve the advancement of multiple pipe segments 100 in the earthwork until finally achieving conduction with the receiving pit and completing the operation.

[0128] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for trenchless construction using a backstop device, characterized in that: include: Step S1, installing the two ends of the anti-retraction device on the pipe section (100) adjacent to the stressed top iron and the stressed top iron respectively, and the pushing device (202) drives the force-applying top iron to abut against the stressed top iron; Step S2, the pushing device (202) contracts along the axial direction of the pipe section (100) adjacent to the stressed top iron, the stop device extends along the axial direction of the pipe section (100) adjacent to the stressed top iron, and the rail clamp (300) is installed on the rail (104) between the pipe section (100) adjacent to the stressed top iron and the stressed top iron, so as to abut against the pipe section (100) adjacent to the stressed top iron; Step S2 also includes: Step S2.1, the pushing device (202) contracts, pulling the force-applying push iron away from the pipe section (100) adjacent to the force-bearing push iron, and the stop device simultaneously extends, pushing the force-bearing push iron away from the pipe section (100) adjacent to the force-bearing push iron, and the force-applying push iron and the force-bearing push iron move synchronously against each other; Step S2.2, the pushing device (202) stops contracting, and the anti-retraction device stops extending; Step S2.3, installing the rail clamp (300) on the rail (104) between the pipe section (100) adjacent to the stressed top iron and the stressed top iron, abutting against the pipe section (100) adjacent to the stressed top iron; Step S3, remove one end of the anti-retraction device from the stressed top iron, remove the stressed top iron, place the pipe section to be installed between the pipe section (100) adjacent to the stressed top iron and the force-applying top iron, install the two ends of the anti-retraction device on the pipe section (100) adjacent to the stressed top iron and the pipe section to be installed, and remove the rail clamp (300); Step S4, the jacking device (202) is extended along the axial direction of the pipe segment (100) adjacent to the force-bearing jacking iron, the stop device is contracted along the axial direction of the pipe segment (100) adjacent to the force-bearing jacking iron, the pipe segment to be installed abuts against and pushes the pipe segment (100) adjacent to the force-bearing jacking iron, and the rail clamp (300) is installed on the rail (104) on the side of the force-applying jacking iron facing the jacking device (202) to abut against the force-applying jacking iron; Step S5, the jacking device (202) contracts along the axial direction of the pipe section (100) adjacent to the force-bearing jacking iron, the force-applying jacking iron is transformed into the force-bearing jacking iron, a new force-applying jacking iron is placed between the force-bearing jacking iron and the jacking device (202), the two ends of the stop device are respectively installed on the force-applying jacking iron and the force-bearing jacking iron, and the rail clamp (300) is removed; Step S6, the pushing device (202) extends along the axial direction of the pipe section (100) adjacent to the force-bearing top iron, and the retreat-stopping device contracts along the axial direction of the pipe section (100) adjacent to the force-bearing top iron until the force-applying top iron abuts against the force-bearing top iron; The anti-retraction device comprises a balancing support member (20) and a limiting component (10), two limiting components (10) are provided, and one limiting component (10) is connected to each of the two ends of the balancing support member (20); Limiting holes are arranged on the pipe section (100) adjacent to the stressed top iron, the pipe section to be installed, the force-applying top iron and the stressed top iron, and the withdrawal prevention device can be inserted into the limiting hole.

2. The method for trenchless construction using a backstop device according to claim 1, characterized in that: Step S3 includes: Step S3.1, remove one end of the stop device from the force-bearing top iron, remove the force-bearing top iron, and then place the pipe section to be installed against the force-applying top iron; Step S3.2, installing the anti-retraction device on the pipe section to be installed; Step S3.3, removing the rail clamp (300) from the rail (104).

3. The method for trenchless construction using a backstop device according to claim 1, characterized in that: Step S4 includes: Step S4.1, the pushing device (202) extends to push the force-applying push iron toward the pipe segment (100) adjacent to the force-bearing push iron, and the stop device contracts synchronously to pull the pipe segment to be installed toward the pipe segment (100) adjacent to the force-bearing push iron, and the pipe segment to be installed and the force-applying push iron abut against each other and move synchronously; Step S4.2, when the pipe section to be installed abuts against the pipe section (100) adjacent to the stressed jacking iron, the jacking device (202) continues to extend until the pipe section to be installed is pushed forward by a set distance; Step S4.3, installing the rail clamp (300) on the rail (104) on the side of the force-applying jack iron facing the jacking device (202), against the force-applying jack iron.

4. The method for trenchless construction using a backstop device according to claim 1, characterized in that: Step S5 includes: Step S5.1, removing the stop device from the pipe section (100) adjacent to the force-bearing jack and the pipe section to be installed, contracting the jacking device (202), transforming the force-applying jack into the force-bearing jack, and placing a new force-applying jack between the force-bearing jack and the jacking device (202); Step S5.2, installing the two ends of the anti-retraction device on the force-applying top iron and the force-receiving top iron respectively; Step S5.3, taking the rail clamp (300) out of the rail (104).

5. The method for trenchless construction using a backstop device according to claim 1, characterized in that: Step S6 includes: Step S6.1, the pushing device (202) extends to push the force-applying push iron toward the force-receiving push iron, and the backstop device contracts synchronously and pulls the force-applying push iron; Step S6.2: When the force-applying push iron abuts against the force-receiving push iron, the pushing device (202) stops extending and the stop device stops contracting.

6. The method for trenchless construction using a backstop device according to claim 1, characterized in that: The pushing device (202) and the stopping device both include a jack.

7. The method for trenchless construction using a backstop device according to any one of claims 1 to 6, characterized in that: The pipe section (100) adjacent to the force-bearing top iron, the pipe section to be installed, the force-applying top iron, the force-bearing top iron and the rail clamp (300) are all arranged on the track (104).

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