Retaining device and retaining method for pipe jacking tunnel

Abstract

The present application relates to a kind of top pipe method tunnel and the retreat device and retreat method of stopping, retreat device includes hinged ring and stopping component, the recess for the stopping component is set in the outer periphery of the hinged ring, the stopping component includes the expansion piece embedded fixed in the recess, the stopping plate fixed in the top end of the expansion piece, and the water stop for connecting the inner wall of the recess and the stopping plate, the water stop is scalable material, the water stop is blocked in the gap between the stopping plate and the hinged ring, the expansion piece is retracted to shortest, the outside of the stopping plate and the outer periphery of the hinged ring are flush.This application solves the technical problem that the top pipe stopping device in the prior art is limited to the material of pipe.This application does not need to be arranged in the top pipe starting well, directly set in top pipe machine head part, no requirement to subsequent pipe material, wide application range, and set in top pipe machine head part, no temporary positioner, before subsequent top pipe close, no back-off.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking engineering technology, and in particular to a backlash prevention device and method for pipe jacking tunnels. Background Technology

[0002] Pipe jacking is a trenchless construction technique for long-distance underground pipelines. This technology has been widely used in the construction of underground pipelines and tunnels for gas, heating, electricity, water supply, and drainage. However, due to the unique nature of pipe jacking, after one pipe section is jacked up, the jacks in the starting shaft must be retracted when the next section is lowered into the shaft. At this time, the pipe jacking machine may retract under the pressure of water and soil at the working face, especially when the jacking distance is short and the frictional resistance is low. Pipe jacking retraction can easily cause soil collapse, resulting in road and pipeline subsidence, and in severe cases, affecting road traffic and the safety of underground pipelines.

[0003] Currently, the principles for preventing pipe jacking retreat vary depending on the type of pipe material. For reinforced concrete pipe sections, anti-retreat holes or lifting holes are pre-drilled on the pipe section, and shear pins are used to connect the pipe section to the fixing mechanism inside the launching shaft to achieve the anti-retreat function. For steel pipe sections, temporary welding is performed between the pipe section and the track to achieve the anti-retreat function. These methods control the pipe jacking retreat phenomenon to a certain extent, but some problems still exist.

[0004] The principles of pipe jacking anti-backlash devices, as disclosed in existing literature and patent documents, can be basically divided into the following four categories: The basic principle of the first type is to install anti-reverse holes (or utilize lifting holes) on the pipe section and use shear pins to connect the pipe section to the fixing mechanism inside the launching shaft to achieve the anti-reverse function. This type of anti-reverse device requires pre-reserved anti-reverse holes on the pipe section and is mostly used in concrete pipe section projects, with limited applicability to projects using other pipe materials.

[0005] The second type of anti-backlash device operates on the principle of increasing pipe friction, for example, by applying circumferential force using clamps to increase the friction of the pipe section and achieve the anti-backlash function. This type of anti-backlash device is relatively large and requires a high internal clearance in the launching shaft, making it unsuitable for general pipe jacking projects. Furthermore, steel jacking pipes typically have thin walls, and applying circumferential clamp force may cause pipe buckling failure.

[0006] The third type is only applicable to steel pipe sections. Its basic principle is to temporarily weld the pipe section to the track to achieve the anti-reverse function. This type of anti-reverse process is limited by the type of pipe material and has a small scope of application. In addition, due to the pre-application of anti-corrosion coating, the welding length is limited, which can easily cause stress concentration and local damage to the pipeline.

[0007] The basic principle of the fourth type is to add a temporary limiting device to stop the pipe section before the hydraulic cylinder retracts its stroke, thus preventing backlash. However, all such solutions have a common problem: during the period from when the temporary stopping device is removed until the next pipe section is tightly sealed, the jacking pipe is in a state without any backlash prevention measures, and backlash will still occur. Summary of the Invention

[0008] To address the shortcomings of the existing technologies, this invention provides a backlash prevention device and method for pipe jacking tunnels. This method is not limited by pipe material and does not require the use of the starting shaft space, thus solving the technical problems of existing pipe jacking backlash prevention devices being limited by the pipe material and the use of the starting shaft space.

[0009] In a first aspect, the present invention discloses a backstop device for a pipe jacking tunnel, comprising a hinge ring and a backstop assembly. The outer periphery of the hinge ring is provided with a groove for accommodating the backstop assembly. The backstop assembly includes a telescopic member embedded and fixed in the groove, a backstop plate fixed to the top of the telescopic member, and a waterstop member for connecting the inner wall of the groove and the backstop plate. The waterstop member is made of a telescopic material and blocks the gap between the backstop plate and the hinge ring. When the telescopic member is extended to its shortest length, the outer side of the backstop plate is flush with the outer periphery of the hinge ring. The telescopic component is a hydraulic cylinder, the bottom end of which is fixed to the bottom wall of the groove, and the top end of which is fixed to the anti-reverse plate. The first end of the waterstop is fixed to the side of the anti-reverse plate near the telescopic member by a fixing member, and the second end of the waterstop is fixed to the side wall of the groove by a fixing member. The hinge ring includes a thickened shield shell, multiple thickened longitudinal stiffening ribs, and multiple thickened circumferential breast plates. The multiple thickened circumferential breast plates are fixed axially at intervals on the inner wall of the thickened shield shell, and the multiple thickened longitudinal stiffening ribs are fixed circumferentially at intervals between adjacent thickened circumferential breast plates. When the pipe section is stopped from moving backward, the stop plate protrudes out of the hinge ring under the action of the hydraulic cylinder, and squeezes against the surrounding soil, generating a large frictional force. This allows the soil pressure on the cutterhead to be balanced with the frictional resistance of the machine head, hinge ring, stop assembly, and pipe section, preventing the pipe section from moving backward.

[0010] The anti-reverse device for the pipe jacking tunnel of the present invention is further improved in that the fixing member includes a pressure plate pressing on the end of the water stop member, a bolt for fixing the pressure plate and the water stop member to the groove or the anti-reverse plate, and the pressure plate has an opening for the bolt to pass through.

[0011] A further improvement of the anti-reverse device for the pipe jacking tunnel of the present invention is that a reinforcing strip is provided on the side of the pressure plate near the sidewall of the groove or the anti-reverse plate.

[0012] A further improvement of the anti-reverse device for the pipe jacking tunnel of the present invention is that an elastic washer is provided on the side of the pressure plate away from the sidewall of the groove or the anti-reverse plate.

[0013] The anti-reverse device of the pipe jacking tunnel of the present invention is further improved in that at least one stiffening arc plate is fixed between two adjacent thickened longitudinal stiffening ribs.

[0014] The further improvement of the anti-backward device for the pipe jacking tunnel of the present invention is that the number of anti-backward components is multiple, and the multiple anti-backward components are arranged at intervals along the circumference of the hinge ring.

[0015] Secondly, the present invention also provides a method for preventing retreat using a pipe jacking tunnel as described above, comprising the following steps: when the pipe jacking construction is in the pipe connection retreat stage, the retreat plate is extended radially outward from the groove to the outside of the hinge ring by extending the telescopic member; when the pipe jacking construction is in the pipe advancing stage, the retreat plate is moved radially from the outside of the hinge ring to the groove by contracting the telescopic member until the outer side of the retreat plate is flush with the outer peripheral surface of the hinge ring.

[0016] Compared with existing technologies, the advantages of this invention are positive and significant. By installing a backstop device at the hinge ring of the pipe jacking machine, this invention eliminates the need for a device at the starting shaft, thus avoiding interference with pipe jacking construction. Furthermore, it places no requirements on subsequent pipe materials, making it widely applicable. In addition, the device is installed at the head of the pipe jacking machine and can be remotely operated via an intelligent control device, which is simple, convenient, and does not require excessive construction time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a longitudinal sectional view of the front part of the pipe jacking section of the anti-backflow device for the pipe jacking tunnel of the present invention.

[0019] Figure 2 This is a transverse cross-sectional view showing the location of the anti-reverse component of the anti-reverse device for the pipe jacking tunnel of the present invention.

[0020] Figure 3 This is a longitudinal sectional view of the anti-reverse component of the anti-reverse device for the pipe jacking tunnel of the present invention in the unextended state.

[0021] Figure 4 A longitudinal sectional view of the anti-reverse assembly of the anti-reverse device for the pipe jacking tunnel of the present invention in the extended state.

[0022] Figure 5 This is a longitudinal sectional view of the pipe advancing stage of the anti-reverse device for the pipe jacking tunnel of the present invention.

[0023] Figure 6 This is a longitudinal sectional view of the pipe-jacking tunnel anti-reverse device of the present invention during the pipe-jacking anti-reverse stage.

[0024] In the diagram: 1. Pipe jacking head; 2. Hinge ring; 3. Pipe jacking cutterhead; 4. Anti-reverse assembly; 21. Shield shell; 22. Longitudinal stiffening rib; 41. Anti-reverse plate; 42. Hydraulic cylinder; 43. Base plate; 44. Water stop; 45. Bolt; 46. Elastic washer; 47. Pressure plate; 48. Reinforcing strip; 5. Thickened circumferential breast plate; 6. Pipe section; 7. Rear hydraulic cylinder; 8. Starting shaft; 9. New pipe section. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1-6 As shown, the present invention provides a backstop device for pipe jacking tunnels, including a hinge ring 2 and a backstop assembly 4. The hinge ring 2 has a groove on its outer periphery for accommodating the backstop assembly 4. The backstop assembly 4 includes a telescopic member embedded and fixed in the groove, a backstop plate 41 fixed to the top of the telescopic member, and a waterstop 44 connecting the inner wall of the groove and the backstop plate 41. The waterstop 44 is made of a telescopic material and blocks the gap between the backstop plate 41 and the hinge ring 2. When the telescopic member is extended to its shortest length, the outer side of the backstop plate 41 is flush with the outer peripheral surface of the hinge ring 2. In this embodiment, the waterstop 44 is a waterstop. Figure 3 and Figure 4As shown, the groove is formed by a base plate 43, two thickened circumferential breast plates 5, and two side plates. The base plate 43 should have strong resistance to deformation. Furthermore, ribs can be welded to the outer surface of the base plate 43 to ensure strength. The outer arc surface of the anti-reverse plate 41 has the same radius as the outer arc surface of the shield shell 21 of the hinge ring 2, and its thickness is thicker than that of the shield shell 21. Considering manufacturing errors and shield deformation in the soil, a certain gap should be left between the anti-reverse plate 41 and the shield shell 21. Furthermore, the size of this gap is 1mm. The anti-reverse component 4 of the present invention is set at the rear of the pipe jacking head 1 or at the hinge device. During normal advancement, it retracts into the shield body; during the anti-reverse stage, it extends outward, squeezing the surrounding soil and increasing friction, thereby achieving the anti-reverse effect. This anti-reverse component 4 has a wide range of applications and is not limited by the pipe material; this anti-reverse component 4 occupies little space and does not require changes to the size of the jacking starting well 8; this anti-reverse component 4 has a high degree of intelligence, is easy to operate, and takes up little construction time; this anti-reverse component 4 will not cause damage to the pipe or deviation of the jacking axis; before the subsequent pipe section 6 is tightly attached, the jacking pipe is always in an effective anti-reverse state.

[0027] Preferred, such as Figure 3 and Figure 4 As shown, the telescopic component is a hydraulic cylinder 42. The bottom end of the hydraulic cylinder 42 is fixed to the bottom wall of the groove, and the top end of the hydraulic cylinder 42 is fixed to the anti-retraction plate 41. The hydraulic cylinder 42 can also be a jack or other electrically operated telescopic component. There are at least two hydraulic cylinders 42, spaced apart inside the groove, so that the anti-retraction plate 41 can be smoothly extended and retracted. More preferably, the anti-retraction plate 41 can be extended non-parallel or parallel as needed by at least two hydraulic cylinders 42.

[0028] Preferred, such as Figure 3 and Figure 4 As shown, the first end of the water-stopping component 44 is fixed to the side of the anti-reverse plate 41 near the telescopic component by a fixing member, and the second end of the water-stopping component 44 is fixed to the side wall of the groove by a fixing member. The water-stopping component 44 is a telescopic wear-resistant sealing water-stopping component 44, possessing extremely high wear resistance and tear resistance. Its main function is to ensure that water from the outside does not seep into the pipe jacking machine when the anti-reverse cylinder 42 is working. This telescopic wear-resistant sealing water-stopping component 44 can be made of EPDM rubber.

[0029] Preferred, such as Figure 3 and Figure 4As shown, the fastener includes a pressure plate 47 pressed against the end of the waterstop 44, and bolts 45 for fixing the pressure plate 47 and the waterstop 44 to the groove or the anti-reverse plate 41. The pressure plate 47 has an opening for the bolts 45 to pass through. The pressure plate 47 increases the pressing area of ​​the waterstop 44, and the use of bolts 45 to fix the waterstop 44 also facilitates subsequent replacement of the waterstop 44. There are multiple fasteners, which are spaced apart along the width direction of the waterstop 44.

[0030] Preferred, such as Figure 3 and Figure 4 As shown, a reinforcing strip 48 is provided on the side of the pressure plate 47 near the side wall of the groove or the anti-recession plate 41. The reinforcing strip 48 is located between the waterstop 44 and the pressure plate 47. The length of the reinforcing strip 48 is not less than the width of the waterstop 44. The reinforcing strip 48 is laid along the width direction of the waterstop 44, and is then pressed against the pressure plate 47 at intervals by bolts 45. This ensures that the edge of the waterstop 44 is evenly pressed by the reinforcing strip 48, preventing uneven force on the waterstop 44 due to the small fixing area between the bolts 45 and the pressure plate 47, which could cause localized stress and damage to the waterstop 44. In this embodiment, the reinforcing strip 48 is made of steel.

[0031] Preferred, such as Figure 3 and Figure 4 As shown, an elastic washer 46 is provided on the side of the pressure plate 47 away from the sidewall of the groove or the anti-recession plate 41. The elastic washer 46 is arranged on the side away from the water-stopping element 44, so that the pressure plate 47 and the sidewall of the groove or the anti-recession plate 41 are more sealed, thereby further increasing the waterproof performance of the edge of the water-stopping element 44.

[0032] Preferred, such as Figure 1 and Figure 2As shown, the hinge ring 2 includes a thickened shield shell 21, multiple thickened longitudinal stiffening ribs 22, and multiple thickened circumferential breast plates 5. The multiple thickened circumferential breast plates 5 are axially spaced and fixed to the inner wall of the thickened shield shell 21, and the multiple thickened longitudinal stiffening ribs 22 are circumferentially spaced and fixed between adjacent thickened circumferential breast plates 5. In this embodiment, because the hinge ring 2 is equipped with an anti-backlash assembly 4, its overall stiffness is reduced. To ensure that the stiffness of the hinge ring 2 meets the requirements during pipe jacking construction, measures are taken to increase the stiffness of the hinge ring 2. For example, in a conventional hinge ring 2, the thicknesses of the shield shell 21, longitudinal stiffening ribs 22, and thickened circumferential breast plate 5 are 30mm, 10mm, and 30mm, respectively. Compared to the conventional hinge ring 2, the thicknesses of the thickened shield shell 21, thickened longitudinal stiffening ribs 22, and thickened circumferential breast plate 5 are all greater. The thickness of the thickened shield shell 21 and thickened longitudinal stiffening ribs 22 is increased by 5mm to 10mm compared to the conventional hinge ring 2. The number of thickened longitudinal stiffening ribs 22 and thickened circumferential breast plates 5 is doubled compared to the conventional hinge ring 2. The conventional device has two thickened circumferential breast plates 5, while this device has two more, for a total of four. By setting up the thickened shield shell 21, thickened longitudinal stiffening ribs 22, and thickened circumferential breast plates 5, the strength of the hinge ring 2 affected by the setting of the anti-reverse assembly 4 is compensated, ensuring that the strength at the hinge ring 2 position meets the requirements of the pipe jacking machine.

[0033] Preferably, at least one stiffening arc plate is fixed between two adjacent thickened longitudinal stiffening ribs 22, thereby further fixing the two adjacent thickened longitudinal stiffening ribs 22 and further improving the strength of the hinge ring 2.

[0034] Preferred, such as Figure 2 As shown, there are multiple anti-reverse components 4, which are arranged at intervals along the circumference of the hinge ring 2. In this embodiment, there are four anti-reverse components 4, which are evenly spaced along the circumference of the hinge ring 2, thereby uniformly increasing the anti-reverse friction force along the circumference of the hinge ring 2, thus preventing the pipe jacking machine from retracting. The anti-reverse components 4 are symmetrically arranged at the hinge ring 2 of the pipe jacking machine, and their number can be adjusted according to factors such as the size of the pipe jacking and relevant soil conditions.

[0035] On the other hand, such as Figure 4 and Figure 5 As shown, the present invention also provides a method for preventing retreat using the anti-retreat device of the pipe jacking tunnel as described above, comprising the following steps: when the pipe jacking construction is in the pipe connection anti-retreat stage, the anti-retreat plate 41 is extended radially outward from the groove to the outside of the hinge ring 2 by extending the telescopic member; when the pipe jacking construction is in the pipe connection construction stage, the anti-retreat plate 41 is moved radially from the outside of the hinge ring 2 to the groove by retracting the telescopic member until the outer side of the anti-retreat plate 41 is flush with the outer peripheral surface of the hinge ring 2.

[0036] Specifically, such as Figure 6 As shown, during the anti-reverse phase of the pipe section, the anti-reverse plate 41, under the action of the hydraulic cylinder 42, protrudes beyond the hinge ring 2, compressing against the surrounding soil and generating significant friction. This ensures that the soil pressure on the cutterhead 3 is balanced with the frictional resistance of the head 1, hinge ring 2, anti-reverse assembly 4, and pipe section 6, preventing pipe section 6 from retracting. At this time, the pipe section 9 is slowly lowered into the starting shaft 8, retracting against the hydraulic cylinder 7. Figure 5 As shown, once all preparations are complete, the hydraulic cylinder 7 inside the launching well 8 is slowly pushed against the rear end of the pipe section 6. Simultaneously, the anti-retracting plate 41 is slowly retracted while increasing the pushing force of the hydraulic cylinder 7 inside the launching well 8.

[0037] This invention solves the technical problem of existing pipe jacking anti-backlash devices being limited by the pipe material by installing an anti-backlash device at the hinge ring of the pipe jacking machine. By placing the anti-backlash device at the hinge ring of the pipe jacking machine, this invention eliminates the need for a device at the starting shaft, thus avoiding interference with pipe jacking construction; furthermore, it has no requirements on subsequent pipe materials, making it widely applicable. In addition, the device is installed at the head of the pipe jacking machine and can be remotely operated via an intelligent control device, which is simple, convenient, and does not require excessive construction time.

[0038] All parts not described in this invention are the same as or can be implemented using existing technologies. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, shall still fall within the scope of the present invention.

Claims

1. A backlash prevention device for pipe jacking tunnels, characterized in that, The device includes a hinge ring and a backstop assembly. The outer periphery of the hinge ring has a groove for accommodating the backstop assembly. The backstop assembly includes a telescopic member embedded and fixed in the groove, a backstop plate fixed to the top of the telescopic member, and a water-stopping member for connecting the inner wall of the groove and the backstop plate. The water-stopping member is made of a telescopic material and blocks the gap between the backstop plate and the hinge ring. When the telescopic member is extended to its shortest length, the outer side of the backstop plate is flush with the outer periphery of the hinge ring. The telescopic component is a hydraulic cylinder, the bottom end of which is fixed to the bottom wall of the groove, and the top end of which is fixed to the anti-reverse plate. The first end of the waterstop is fixed to the side of the anti-reverse plate near the telescopic member by a fixing member, and the second end of the waterstop is fixed to the side wall of the groove by a fixing member. The hinge ring includes a thickened shield shell, multiple thickened longitudinal stiffening ribs, and multiple thickened circumferential breast plates. The multiple thickened circumferential breast plates are fixed axially at intervals on the inner wall of the thickened shield shell, and the multiple thickened longitudinal stiffening ribs are fixed circumferentially at intervals between adjacent thickened circumferential breast plates. When the pipe section is stopped from moving backward, the stop plate protrudes out of the hinge ring under the action of the hydraulic cylinder, and squeezes against the surrounding soil, generating a large frictional force. This allows the soil pressure on the cutterhead to be balanced with the frictional resistance of the machine head, hinge ring, stop assembly, and pipe section, preventing the pipe section from moving backward.

2. The anti-reverse device for pipe jacking tunnels according to claim 1, characterized in that, The fastener includes a pressure plate pressed against the end of the waterstop and a bolt for fixing the pressure plate and the waterstop to the groove or the anti-reverse plate. The pressure plate has an opening for the bolt to pass through.

3. The anti-reverse device for pipe jacking tunnels according to claim 2, characterized in that, The pressure plate is provided with a reinforcing strip on the side of the groove or the anti-reverse plate.

4. The anti-reverse device for pipe jacking tunnels according to claim 2, characterized in that, The pressure plate is provided with an elastic washer on the side away from the groove sidewall or the anti-reverse plate.

5. The anti-reverse device for pipe jacking tunnels according to claim 1, characterized in that, At least one stiffening arc plate is fixed between two adjacent thickened longitudinal stiffening ribs.

6. The anti-reverse device for pipe jacking tunnels according to claim 1, characterized in that, The number of anti-reverse components is multiple, and the multiple anti-reverse components are arranged at intervals along the circumference of the hinge ring.

7. A method for preventing retreat using the anti-retreat device for pipe jacking tunnels as described in claim 1, characterized in that, Includes the following steps: When the pipe jacking construction is in the pipe connection and back-out stage, the back-out plate is protruded radially outward from the groove and outside the hinge ring by the extension expansion member; When the pipe jacking construction is in the pipeline advancement stage, the anti-reverse plate is moved radially from the outside of the hinge ring to the groove by contracting the telescopic component until the outer side of the anti-reverse plate is flush with the outer circumferential surface of the hinge ring.

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