Pipe section for pipe jacking construction, pipe jacking device and pipe jacking construction method

Abstract

The application provides a pipe joint for pipe jacking construction, a pipe jacking device and a pipe jacking construction method. The pipe joint for pipe jacking construction comprises a pipe joint body and a flexible sleeve. The outer wall of the pipe joint body is provided with a first accommodating groove and a second accommodating groove. The flexible sleeve comprises a sleeve body and two fixing rings. The sleeve body is accommodated in the first accommodating groove after being laminated between the pipe walls of the first accommodating groove and the second accommodating groove. The fixing ring has a contracted state and an expanded state. When in the contracted state, the fixing ring is accommodated in the corresponding first accommodating groove or second accommodating groove. When in the expanded state, the fixing ring can expand radially to be separated from the corresponding first accommodating groove or second accommodating groove. The application can form a mud sleeve in a stratum such as a sand pebble layer which is not easy to form a mud sleeve, thereby reducing the frictional resistance when the subsequent pipe joint body is pushed forward, solving the problems that the mud loss is large in the sand pebble stratum and the mud sleeve is difficult to form, and helping to improve the construction efficiency and ensure the construction progress.

Description

Technical Field

[0001] This invention belongs to the field of pipe jacking construction technology, specifically relating to a pipe section, pipe jacking device, and pipe jacking construction method. Background Technology

[0002] Pipe jacking is a trenchless construction technique that allows pipelines to be laid without excavating the ground. It can cross highways, railways, rivers, lakes, buildings, and various underground pipelines, and can be used for pipelines supplying water, drainage, gas, electricity, and communications. The principle of pipe jacking is to use the jacking force generated by the jacking equipment to overcome the friction between the pipe section and the surrounding soil, pushing the pipe section into the soil layer, and then removing the excavated soil. After one pipe section is successfully pushed into the soil layer, the second pipe section is inserted and the jacking continues, thus completing the entire pipeline laying work.

[0003] To reduce the resistance during pipe jacking, friction-reducing slurry can be injected into the gap between the pipe section and the soil layer. Ideally, the pipe section should be completely encased in slurry, allowing it to pass through the slurry and minimizing friction with the soil. However, when the pipe jacking machine traverses soft or gravelly strata, the high porosity of the soil leads to significant slurry loss, making it difficult to form a slurry sheath. This increases the friction between the pipe section and the soil, and in severe cases, can cause difficulties in pipe jacking and lead to pipe jamming. Summary of the Invention

[0004] This invention provides a pipe section, a pipe jacking device, and a pipe jacking construction method, aiming to solve the problem that it is difficult to form a mud sleeve in sandy and gravelly strata, which brings difficulties to pipe jacking construction.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a pipe section for pipe jacking construction, comprising:

[0007] The pipe section body has a first receiving groove and a second receiving groove sequentially formed on its outer wall along its own axial direction. The first receiving groove and the second receiving groove are respectively arranged along the circumference of the pipe section body. The first receiving groove is adjacent to the front end of the pipe section body, and the second receiving groove is adjacent to the rear end of the pipe section body.

[0008] A flexible sleeve includes a sleeve body and two fixing rings respectively connected to both ends of the sleeve body. One fixing ring is housed in a first receiving groove, and the other fixing ring is housed in a second receiving groove. The sleeve body is a flexible waterproof component. The sleeve body is sleeved on the outer periphery of the pipe section body, and the sleeve body has a stacked portion and an extension portion that are connected to each other along its own length direction. The stacked portion is connected to the fixing ring housed in the first receiving groove and is housed in the first receiving groove. The end of the extension portion away from the stacked portion is connected to the fixing ring housed in the second receiving groove.

[0009] The retaining ring has a contracted state and an expanded state. When it is in the contracted state, the retaining ring is accommodated in the corresponding first accommodating groove or the second accommodating groove. When it is in the expanded state, the retaining ring can expand radially to disengage from the corresponding first accommodating groove or the second accommodating groove.

[0010] In one possible implementation, the fixing ring includes multiple connecting strips, which are connected end to end in a ring structure.

[0011] One end of the connecting strip is provided with a sliding groove, and the inner wall of the sliding groove is provided with multiple slots along its own length. The other end of the connecting strip is provided with a slide bar, and one side of the slide bar is provided with multiple locking blocks along its own length. The slide bar is inserted into the sliding groove on the adjacent connecting strip. The slots are adapted to the locking blocks and can stop and limit the locking blocks to restrict the displacement of the two adjacent connecting strips in the insertion direction of the slide bar.

[0012] In one possible implementation, the pipe section body has multiple adjustment holes along its circumference, the adjustment holes penetrate the pipe wall of the pipe section body and communicate with the corresponding first receiving groove or second receiving groove; the pipe section for jacking construction also includes multiple adjustment components, the adjustment components are correspondingly provided in the adjustment holes and can move along the opening direction of the adjustment holes.

[0013] In one possible implementation, the adjusting element is threaded into the adjusting hole.

[0014] In one possible implementation, the inner edge of the fixing ring has a guide arc surface.

[0015] In one possible implementation, the first receiving groove has a guide ramp on the side adjacent to the second receiving groove.

[0016] In one possible implementation, the tube body is a circular tube or a rectangular tube.

[0017] Compared with the prior art, the beneficial effects of the pipe section for pipe jacking construction provided by the present invention are as follows: The pipe section for pipe jacking construction provided by the present invention includes a pipe section body and a flexible casing. During the advancement of the pipe section, both fixing rings are in a contracted state, and the stacked part of the casing body is in a stacked state and is accommodated in the first receiving groove. When the pipe section body is pushed to the first position where the sand and gravel layer is located, the fixing ring adjacent to the rear end of the pipe section body (i.e., the second receiving groove) can be controlled to change from a contracted state to an expanded state, so that the fixing ring is dislodged from the second receiving groove and supported against the inner wall of the formation. Then the pipe section body drives the other end of the flexible casing (i.e., the stacked part) to continue to advance forward. During this period, the casing body of the stacked part gradually disengages from the first receiving groove and unfolds as the casing body moves until the casing body is pushed to the next position. After the casing body moves to the second position, the fixing ring contained in the first receiving groove changes from a contracted state to an expanded state, causing the fixing ring to disengage from the first receiving groove and push against the inner wall of the formation. In this way, the two fixing rings, the casing body connected between the two fixing rings, and one or more pipe sections together form a mud filling cavity for mud injection. The two fixing rings fix the flexible casing at the formation position, and the mud can reduce the resistance of subsequent pipe section advancement.

[0018] The casing body in this invention is made of flexible waterproof material, which can form a mud sleeve in strata such as sand and gravel layers where it is difficult to form a mud sleeve. This reduces the frictional resistance when the subsequent pipe section body is advanced, solves the problem of large mud loss and difficulty in forming a mud sleeve in strata such as sand and gravel, avoids problems such as difficulty in advancement and pipe jamming, helps to improve construction efficiency and ensure construction progress.

[0019] In a second aspect, the present invention provides a pipe jacking device, comprising:

[0020] Pipe jacking machine; and

[0021] At least one pipe section for pipe jacking construction as described in any of the above implementations, wherein the pipe jacking machine is used to push the pipe section body along the jacking direction.

[0022] The pipe jacking device provided by the present invention includes pipe sections for pipe jacking construction as described in any of the above implementations, and has the same technical effects as them, which will not be repeated here.

[0023] In a third aspect, the present invention provides a pipe jacking construction method, implemented using a pipe jacking device as described in any of the above embodiments, comprising the following steps:

[0024] The pipe jacking machine is used to jack the pipe section into the formation until the pipe section body reaches the first predetermined position, at which point the jacking stops.

[0025] The fixing ring located at the rear end of the pipe section body changes from a contracted state to an expanded state. The expanded fixing ring disengages from the second receiving groove and presses against the inner wall of the excavated soil.

[0026] The pipe jacking machine is controlled to continue pushing the pipe section body forward, causing the pipe section body to drive the other end of the flexible sleeve forward until the pipe section body reaches the second predetermined position, at which point the jacking stops.

[0027] The fixing ring located at the front end of the pipe section body changes from a contracted state to an expanded state. The expanded fixing ring disengages from the first receiving groove and presses against the inner wall of the excavated soil, thereby forming a grouting chamber.

[0028] Slurry is injected into the grouting chamber to reduce the frictional resistance during the advancement of subsequent pipe sections.

[0029] In one possible implementation, the stacked tube walls of the sleeve body are fixed together by adhesive bonding.

[0030] The pipe jacking construction method provided by this invention can form a mud sleeve in strata such as sand and gravel layers where it is difficult to form a mud sleeve, thereby reducing the frictional resistance when the subsequent pipe section body is advanced. It solves the problem of large mud filtration loss and difficulty in forming a mud sleeve in strata such as sand and gravel layers, avoids problems such as difficulty in advancement and pipe jamming, and helps to improve construction efficiency and ensure construction progress. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the pipe section body in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a pipe section for pipe jacking construction provided in one embodiment of the present invention;

[0033] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0034] Figure 4 This is a schematic diagram of the structure of the fixing ring in one embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the connecting strip in one embodiment of the present invention;

[0036] Figure 6 This is a partial structural schematic diagram of a fixing ring provided in another embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the fixing ring provided in another embodiment of the present invention;

[0038] Figure 8This is a schematic diagram of the structure of a pipe jacking device provided in one embodiment of the present invention;

[0039] Figure 9 for Figure 8 Enlarged view of part B in the middle;

[0040] Figure 10 for Figure 8 A cross-sectional view along the CC direction;

[0041] Figure 11 This is a schematic diagram of the structure of the pipe section used in pipe jacking construction and the stratum during construction, provided by the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Pipe section for pipe jacking construction; 10. Pipe section body; 11. First receiving groove; 111. Guide slope; 12. Second receiving groove; 13. Adjustment hole; 20. Flexible sleeve; 21. Sleeve body; 22. Fixing ring; 221. Connecting strip; 222. Sliding groove; 223. Sliding strip; 224. Slot; 225. Slot block; 226. Guide arc surface; 227. Ratchet; 228. Claw; 30. Adjusting component; 2. Pipe jacking machine; 3. Ordinary pipe section. Detailed Implementation

[0044] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0045] It should be noted that when an element is referred to as "fixed to," "fixed," or "attached" to another element, it can be directly on the other element or may have an intervening element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or may have an intervening element. When an element is referred to as "set on" or "located on" another element, it can be directly on the other element or may have an intervening element. "Multiple" refers to two or more items. "At least one" refers to one or more items. "Several" refers to one or more items.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0047] Please refer to the following: Figures 1 to 11 The following describes the pipe section 1, the pipe jacking device, and the pipe jacking construction method provided in the embodiments of the present invention.

[0048] Please see Figures 1 to 7This invention provides a pipe section 1 for pipe jacking construction, comprising a pipe section body 10 and a flexible sleeve 20. Two receiving grooves, a first receiving groove 11 and a second receiving groove 12, are sequentially formed on the outer wall of the pipe section body 10 along its axial direction. The first receiving groove 11 is adjacent to the front end of the pipe section body 10, and the second receiving groove 12 is adjacent to the rear end of the pipe section body 10. The first receiving groove 11 and the second receiving groove 12 are respectively arranged circumferentially along the pipe section body 10. The flexible sleeve 20 includes a sleeve body 21 and two fixing rings 22. The sleeve body 21 is made of flexible waterproof material, and the two fixing rings 22 are respectively connected to both ends of the sleeve body 21. One fixing ring 22 is received in the first receiving groove 11, and the other fixing ring 22 is received in the second receiving groove 12. The sleeve body 21 is made of flexible waterproof material and is fitted around the outer periphery of the pipe section body 10, having connected overlapping portions and extension portions. After the stacked tube walls are stacked, they are housed in the first receiving groove 11. One end of the stacked part is connected to the fixing ring 22 housed in the first receiving groove 11, and the other end is connected to the extension part. The end of the extension part away from the stacked part is connected to the fixing ring 22 housed in the second receiving groove 12.

[0049] The fixing ring 22 can expand radially. The fixing ring 22 has a contracted state and an expanded state. When it is in the contracted state, the two fixing rings 22 are respectively accommodated in the corresponding first accommodating groove 11 or the second accommodating groove 12, and the tube wall (stacked part) of the sleeve body 21 is accommodated in the first accommodating groove 11 after being stacked. When it is in the expanded state, the fixing ring 22 expands radially to disengage from the corresponding first accommodating groove 11 or the second accommodating groove 12.

[0050] Compared with the prior art, the beneficial effects of the pipe section 1 for pipe jacking construction provided by the present invention are as follows: The pipe section 1 for pipe jacking construction provided by the present invention includes a pipe section body 10 and a flexible sleeve 20. During the advancement of the pipe section, both fixing rings 22 are in a contracted state, and the stacked portion of the sleeve body 21 is in a stacked state and is accommodated in one of the receiving grooves. When the pipe section body 10 is pushed to the first position where the sand and gravel layer is located, the fixing ring 22 adjacent to the rear end of the pipe section body 10 (i.e., accommodated in the second receiving groove 12) can be controlled to change from a contracted state to an expanded state, so that the fixing ring 22 is dislodged from the second receiving groove 12 and supported against the inner wall of the formation. Then the pipe section body 10 drives the other end of the flexible sleeve 20 (i.e., the stacked portion) to continue to advance forward. During this period, the stacked portion of the sleeve body 21 gradually disengages from the first receiving groove 11 and unfolds as the sleeve body 11 is pushed forward until the sleeve body 21 is pushed to the next position. After the casing body 21 moves to the second position, the fixing ring 22, which is contained in the first receiving groove 11, changes from a contracted state to an expanded state, so that the fixing ring 22 is dislodged from the first receiving groove 11 and supports the inner wall of the formation. In this way, the two fixing rings 22, the casing body 21 connected between the two fixing rings 22, and one or more pipe sections 10 are together enclosed to form a mud filling cavity for injecting mud. The two fixing rings 22 fix the flexible casing 20 in the formation position, and the mud can reduce the resistance of subsequent pipe section 10 advancement.

[0051] In this embodiment of the invention, the casing body 21 is made of flexible waterproof material, which can form a mud sleeve in strata such as sand and gravel layers where it is difficult to form a mud sleeve. This reduces the frictional resistance when the subsequent pipe section body 10 is advanced, solves the problem of large mud loss and difficulty in forming a mud sleeve in strata such as sand and gravel, avoids problems such as difficulty in advancement and pipe jamming, helps to improve construction efficiency and ensure construction progress.

[0052] In this embodiment of the invention, the pipe section body 10 is generally prefabricated in a prefabrication plant, and its material, diameter, and dimensions are determined according to the drawing requirements. It can be a cast iron pipe or a cement pipe, etc. It can be a cylindrical pipe or a rectangular pipe. Two receiving grooves are spaced apart along the axial direction on the outer wall of the pipe section body 10. The first receiving groove 11 is used to receive one of the fixing rings 22, and the second receiving groove 12 is used to receive the other fixing ring 22 and the stacked sleeve body 21. The two receiving grooves can be the same or different in shape and size. The first receiving groove 11 and the second receiving groove 12 should ensure that the fixing ring 22 and the sleeve body 21, after being received therein, do not protrude from the outer wall of the pipe section body 10, so that they can smoothly advance forward with the pipe section body 10.

[0053] The flexible sleeve 20 includes a sleeve body 21 and two fixing rings 22 located at both ends of the sleeve body 21. The sleeve body 21 is made of a flexible waterproof material (such as PVC, rubber, etc.). Depending on its installation location, the sleeve body 21 is divided into a stacked portion and an extension portion that are connected to each other along its own length. The sleeve body 21 is flexible so that it can be stacked and accommodated in the first receiving groove 11. Figure 3 The portion shown within the first receiving groove 11 is defined as the laminated portion. The sleeve body 21 is waterproof, thus enabling it to be exposed to... Figure 10 Mud is injected into the mud filling cavity shown. At the same time, considering the pressure of the mud during injection, the casing body 21 also needs to have a certain strength to prevent damage after the mud is injected.

[0054] Considering that the sleeve body 21 is deformed by external force and thus accumulates elastic force, in order to enable the sleeve body 21 to be smoothly stacked in the first receiving groove, each layer of the sleeve body 21 can be temporarily fixed by a certain adhesive to overcome the elastic force generated after its own deformation. The setting of the adhesive does not affect the normal use of the sleeve body 21, as long as it is ensured that each layer of the sleeve body 21 can be separated under the action of external force.

[0055] Optionally, the diameter of the sleeve body 21 is 20-40 mm larger than that of the pipe section body 10, and it is sleeved on the outer periphery of the pipe section body 10. The wall thickness is generally 2-4 mm, and the length can cover the length of one or more pipe sections 10. The specific length can be determined according to actual needs.

[0056] In this embodiment of the invention, the fixing ring 22 is used to fix the casing body 21. After reaching the set position, it expands to fix the position of the casing body 21 in the soil layer. Before the pipe jacking construction, the stacked part of the flexible casing 20 is installed in the first receiving groove of the pipe section body 10, so that it is pushed into the soil layer together with the pipe section body 10. When it reaches the position, a closed cavity is formed by the casing body 21 and the fixing ring 22 for injecting friction-reducing mud to reduce the frictional resistance during jacking and ensure the smooth progress of the pipe jacking construction.

[0057] The fixing ring 22 can expand outward, thereby disengaging from the corresponding first receiving groove 11 or second receiving groove 12 and pressing firmly into the soil layer. The fixing ring 22 can be made of metal (such as carbon steel) or a material with a certain strength (such as plastic). The fixing ring 22 can expand outward, and its specific structural form is not limited, as long as it meets the usage requirements. The following are examples of its possible structures.

[0058] Please see Figure 4 and Figure 5In some possible embodiments, the fixing ring 22 includes multiple connecting strips 221, which are connected end to end to form a ring structure. One end of each connecting strip 221 has a groove 222, and the inner wall of the groove 222 has multiple slots 224 along its length. The other end of each connecting strip 221 has a slide 223, and one side of the slide 223 has multiple locking blocks 225 along its length. The slide 223 engages with the groove 222 on the adjacent connecting strip 221, meaning the slide 223 of the preceding connecting strip 221 is inserted into the groove 222 of the following connecting strip 221. The slots 224 and locking blocks 225 are adapted to each other and can stop and limit the locking blocks 225, thereby restricting the displacement of the two adjacent connecting strips 221 in the insertion direction of the slide 223 and preventing the slide 223 from continuing to insert into the groove 222. In other words, the fixing ring 22 can only expand under external force, and cannot contract.

[0059] In this embodiment, the fixing ring 22 is formed by connecting multiple connecting strips 221 into a circular ring. One end of the connecting strip 221 is provided with a groove 222, and the other end is provided with a slide bar 223. The slide bar 223 can slide within the groove 222. When the fixing ring 22 expands, the slide bar 223 is pulled out of the groove 222 by a certain length. The locking block 225 and the locking groove 224 are serrated. The locking block 225 and the locking groove 224 limit the slide bar 223 to prevent it from retracting back into the groove 222.

[0060] Please see Figure 6 In some possible embodiments, the fixing ring 22 includes multiple connecting strips 221, which are connected end to end to form a ring; one end of the connecting strip 221 is provided with a sliding groove 222, and the inner wall of the sliding groove 222 is provided with multiple slots 224 along its own length direction; the other end of the connecting strip 221 is provided with a slide 223, and one side of the slide 223 is provided with multiple ratchet teeth 227 along its own length direction; the inner wall of the sliding groove 222 is provided with a claw 228, and the claw 228 and the ratchet teeth 227 form a ratchet mechanism, so that the slide 223 can only be pulled outward and cannot be retracted inward, which can also achieve the anti-retraction function.

[0061] Please see Figure 7 In some possible embodiments, the fixing ring 22 is formed by four L-shaped connecting rods, which are joined end to end to form a rectangle.

[0062] It should be noted that the change of the fixed ring 22 from the contracted state to the expanded state can be operated manually by entering the pipe section body 10, or a driving device (such as a micro motor, telescopic rod, etc.) can be set on the fixed ring 22 to drive the connecting bar 221 to extend outward by itself, so as to expand the diameter of the fixed ring 22. This embodiment does not limit this.

[0063] Please see Figure 1 , Figure 2 , Figure 3 In some possible embodiments, the pipe section body 10 is provided with a plurality of adjustment holes 13 along its circumference. The adjustment holes 13 penetrate the pipe wall of the pipe section body 10 and are connected to the corresponding first receiving groove 11 or second receiving groove 12. The pipe section 1 for jacking construction also includes a plurality of adjustment members 30, which are provided one-to-one in the adjustment holes 13 and can move along the opening direction of the adjustment holes 13.

[0064] In this embodiment, the adjusting member 30 is disposed within the adjusting hole 13. It can be a push rod or other pushing member capable of pushing the fixing ring 22 to expand. The adjusting member 30 can be pushed manually by entering the pipe section body 10. When the size of the pipe section body 10 is insufficient for personnel to enter, it can also be pushed by a cylinder, electric push rod, etc. disposed in the pipe section body 10.

[0065] In some possible embodiments, the adjusting member 30 is threadedly engaged with the adjusting hole 13. Specifically, the adjusting member 30 can be a screw. By turning the screw with a screwdriver, the screw pushes the sleeve fixing ring 22 from a contracted state to an expanded state, thereby pressing it tightly against the excavated soil layer.

[0066] Please see Figure 9 In some possible embodiments, the inner edge of the fixing ring 22 has a guide arc surface 226. When the fixing ring 22 is fixed to the excavated soil layer, an outwardly protruding dividing ring is formed on the excavated soil layer. The arc-shaped guide arc surface 226 is conducive to the subsequent passage of the jacking pipe body.

[0067] Please see Figure 2 and Figure 3 In some possible embodiments, two receiving slots are defined as a first receiving slot 11 and a second receiving slot 12. In the jacking direction, the first receiving slot 11 is located in front of the second receiving slot 12. The stacked portion of the sleeve body 21 is received in the first receiving slot 11 after the tube wall is stacked.

[0068] Please see Figure 1 and Figure 3 In some possible embodiments, the first receiving groove 11 has a guide ramp 111 on the side adjacent to the second receiving groove 12 so that the stacked sleeve body 21 can be more easily removed from the first receiving groove 11.

[0069] Please see Figure 4 and Figure 7 In some possible embodiments, the tube body 10 is a circular tube or a rectangular tube.

[0070] Please see Figures 8 to 11 In a second aspect, embodiments of the present invention provide a pipe jacking device, including a pipe jacking machine 2 and at least one pipe section 1 for pipe jacking construction, wherein the pipe jacking machine 2 is used to push the pipe section body 10 along the jacking direction.

[0071] The pipe jacking device provided in this embodiment of the invention includes a pipe jacking machine 2 and at least one pipe section 1 for pipe jacking construction. Considering that the pipe section 1 for pipe jacking construction has a more complex structure and higher manufacturing cost, an ordinary pipe section 3 can be used in ordinary soil sections where it is not needed. That is, the ordinary pipe section 3 is used in combination with the pipe section 1 for pipe jacking construction during pipe jacking construction, which can save construction costs and achieve better economic benefits.

[0072] Depending on the geological conditions, flexible sleeves 20 can be installed throughout the entire jacking soil layer, or they can be installed only for soil layers such as sand and gravel where it is difficult to form mud sleeves.

[0073] In a third aspect, embodiments of the present invention provide a pipe jacking construction method, implemented using the aforementioned pipe jacking device, comprising the following steps: using a pipe jacking machine 2 to jack a pipe section 1 for pipe jacking construction into the stratum until the pipe section body 10 reaches a first predetermined position, and then stopping the jacking; causing the fixing ring 22 located at the rear end of the pipe section body 10 to change from a contracted state to an expanded state, the expanded fixing ring 22 detaching from the second receiving groove 12 and pressing against the inner wall of the excavated soil; controlling the pipe jacking machine 2 to continue pushing the pipe section body 10 forward, causing the pipe section body 10 to drive the other end of the flexible sleeve 20 forward until the pipe section body 10 reaches a second predetermined position, and then stopping the jacking; causing the fixing ring 22 located at the front end of the pipe section body 10 to change from a contracted state to an expanded state, the expanded fixing ring 22 detaching from the first receiving groove 11 and pressing against the inner wall of the excavated soil, thereby forming a grouting chamber; injecting mud into the grouting chamber, thereby reducing the frictional resistance during the advancement of subsequent pipe sections. The subsequent pipe section can be an ordinary pipe section 3 or a pipe section 1 for pipe jacking construction. The 21 layers of the casing body are bonded and fixed together with adhesive.

[0074] The pipe jacking construction method provided by this invention can form a mud sleeve in strata such as sand and gravel layers where it is difficult to form a mud sleeve, thereby reducing the frictional resistance when the subsequent pipe section body 10 is advanced. It solves the problem of large mud filtration loss and difficulty in forming a mud sleeve in strata such as sand and gravel layers, avoids problems such as difficulty in advancement and pipe jamming, and helps to improve construction efficiency and ensure construction progress.

[0075] It should be noted that before pipe jacking construction, a detailed exploration of the construction strata is required to determine the location and extent of the gravel layer, so as to determine the route of pipe jacking construction and the length and quantity of pipe sections 1 used for pipe jacking construction.

[0076] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipe section for pipe jacking construction, characterized in that, include: The pipe section body has a first receiving groove and a second receiving groove sequentially formed on its outer wall along its own axial direction. The first receiving groove and the second receiving groove are respectively arranged along the circumference of the pipe section body. The first receiving groove is adjacent to the front end of the pipe section body, and the second receiving groove is adjacent to the rear end of the pipe section body. A flexible sleeve includes a sleeve body and two fixing rings respectively connected to both ends of the sleeve body. One fixing ring is housed in a first receiving groove, and the other fixing ring is housed in a second receiving groove. The sleeve body is a flexible waterproof component. The sleeve body is sleeved on the outer periphery of the pipe section body, and the sleeve body has a stacked portion and an extension portion that are connected to each other along its own length direction. The stacked portion is connected to the fixing ring housed in the first receiving groove and is housed in the first receiving groove. The end of the extension portion away from the stacked portion is connected to the fixing ring housed in the second receiving groove. The retaining ring has a contracted state and an expanded state. When it is in the contracted state, the retaining ring is accommodated in the corresponding first accommodating groove or the second accommodating groove. When it is in the expanded state, the retaining ring can expand radially to disengage from the corresponding first accommodating groove or the second accommodating groove.

2. The pipe section for pipe jacking construction according to claim 1, characterized in that, The fixing ring includes multiple connecting strips, which are connected end to end to form a ring structure. One end of the connecting strip is provided with a sliding groove, and the inner wall of the sliding groove is provided with multiple slots along its own length. The other end of the connecting strip is provided with a sliding bar, and one side of the sliding bar is provided with multiple locking blocks along its own length. The sliding bar is inserted into the sliding groove on the adjacent connecting strip, and the slots and locking blocks are adapted to restrict the displacement of the two adjacent connecting strips in the insertion direction of the sliding bar.

3. The pipe section for pipe jacking construction according to claim 2, characterized in that, The pipe section body has multiple adjustment holes along its circumference. The adjustment holes penetrate the pipe wall of the pipe section body and communicate with the corresponding first receiving groove or second receiving groove. The pipe section for jacking construction also includes multiple adjustment components, which are correspondingly provided in the adjustment holes and can move along the opening direction of the adjustment holes.

4. The pipe section for pipe jacking construction according to claim 3, characterized in that, The adjusting element is threadedly engaged with the adjusting hole.

5. The pipe section for pipe jacking construction according to claim 1, characterized in that, The inner edge of the fixing ring has a guide arc surface.

6. The pipe section for pipe jacking construction according to claim 1, characterized in that, The first receiving groove has a guide slope on the side adjacent to the second receiving groove.

7. The pipe section for pipe jacking construction according to claim 1, characterized in that, The tube section body is a round tube or a rectangular tube.

8. A pipe jacking device, characterized in that, include: Pipe jacking machine; as well as At least one pipe section for pipe jacking construction as described in any one of claims 1-7, wherein the pipe jacking machine is used to push the pipe section body along the jacking direction.

9. A pipe jacking construction method, characterized in that, The method employs the pipe jacking device as described in claim 8, comprising the following steps: The pipe jacking machine is used to jack the pipe section into the formation until the pipe section body reaches the first predetermined position, at which point the jacking stops. The fixing ring located at the rear end of the pipe section body changes from a contracted state to an expanded state. The expanded fixing ring disengages from the corresponding second receiving groove and presses against the inner wall of the excavated soil. The pipe jacking machine is controlled to continue pushing the pipe section body forward, causing the pipe section body to drive the other end of the flexible sleeve forward until the pipe section body reaches the second predetermined position, at which point the jacking stops. The fixing ring located at the front end of the pipe section body changes from a contracted state to an expanded state. The expanded fixing ring disengages from the corresponding first receiving groove and presses against the inner wall of the excavated soil, thereby forming a grouting chamber. Slurry is injected into the grouting chamber to reduce the frictional resistance during the advancement of subsequent pipe sections.

10. The pipe jacking construction method according to claim 9, characterized in that, The sleeve body is fixed by adhesive bonding between the stacked tube walls.

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