Pipe jacking method double-barrelled prefabricated pipe gallery

Abstract

The application discloses a double-barrel prefabricated pipe gallery by pipe jacking method, which comprises a plurality of pipe jacking outer barrels connected in series along an axis and a plurality of prefabricated inner barrel pipe galleries connected in series along the axis, the pipe jacking outer barrel is a barrel structure with a flat outer side and a wavy inner side, the prefabricated inner barrel pipe gallery is a barrel structure with a flat inner side and a wavy outer side, each prefabricated inner barrel pipe gallery is covered by two adjacent pipe jacking outer barrels, the length of the prefabricated inner barrel pipe gallery is equal to that of the pipe jacking outer barrel, the two ends of the prefabricated inner barrel pipe gallery are flush with the vertical plane where the middle lines of the flat sections of the two pipe jacking outer barrels are located, in the pipe jacking construction process, the pipe jacking outer barrel is a main force transmission member, and when the pipe jacking outer barrel is pushed forward, the coaxial prefabricated inner barrel pipe gallery covered inside is driven, the application not only compresses the construction speed of the prefabricated pipe gallery by pipe jacking method while ensuring the quality, but also improves the anti-leakage performance of the prefabricated pipe gallery.

Description

Technical Field

[0001] This invention relates to the field of underground structure construction. More specifically, this invention relates to a double-cylinder prefabricated pipe gallery using the pipe jacking method. Background Technology

[0002] With the continuous advancement of urbanization, underground integrated pipe corridors, as underground structures that can uniformly accommodate and organize municipal pipelines such as electricity, heating, communication, water supply and drainage, gas, and radio and television, have been widely adopted. In order to avoid affecting the normal operation of the city, the tunneling method is often used for pipeline construction on some construction routes. Among the construction methods involved in the tunneling method, the pipe jacking method has been used due to its characteristics of fast construction and tunnel formation as the pipe jacking progresses.

[0003] Because utility tunnels require internal partitioning, secondary construction of internal partition walls is necessary after pipe jacking. This step involves unnecessary construction time due to the narrow internal space of the tunnel and the secondary pouring method. If the partition walls are prefabricated directly as part of the pipe jacking segments, the relatively thin walls are likely to suffer localized damage under stress during the jacking process. Furthermore, due to the unique construction method of pipe jacking, the waterstop rings at the joints of pipe segments are prone to failure, leading to internal leakage and hindering the later operation and maintenance of the prefabricated utility tunnel. The patent application publication number CN111287217A discloses a construction system for a pipe gallery in which pipe sections and inner diaphragms are prefabricated as a whole. It avoids secondary construction inside the pipe jacking by prefabricating inner diaphragms. However, its construction method still requires secondary installation of partition walls inside, and the single pipe jacking method still cannot avoid serious pipe section leakage risks. Therefore, it is necessary to invent a prefabricated pipe gallery with a high degree of prefabrication that is applicable to the existing pipe jacking method without affecting the progress and quality of pipe jacking construction. Moreover, this prefabricated pipe gallery can effectively reduce the risk of leakage in the pipe jacking gallery. Summary of the Invention

[0004] One objective of this invention is to provide a precast double-cylinder pipe gallery using the pipe jacking method, which can effectively reduce the workload of secondary construction after pipe laying while ensuring the construction quality of the pipe jacking components, and effectively reduce the risk of leakage in the pipe sections of the precast pipe gallery using the pipe jacking method.

[0005] To achieve these and other advantages according to the invention, according to one aspect of the invention, the invention provides a prefabricated double-cylinder pipe gallery using a pipe jacking method, comprising: Multiple jacking pipe outer cylinders are connected in series along an axis. The outer cylinder has a cylindrical structure with a straight outer side and an undulating inner side. The outer cylinder includes a front top surface, a rear top surface, an inner wall, and an outer wall. The outer wall is straight. The inner wall of the outer cylinder is divided into a straight front straight section, a front extrusion section with an inwardly narrowing diameter, a straight middle straight section, a rear extrusion section with an outwardly expanding diameter, and a straight rear straight section from one end of the front top surface to one end of the rear top surface. The front top surface has a front fixing hole, and the rear top surface has a rear fixing hole. The positions of the front fixing hole and the rear fixing hole correspond one-to-one. The junction of the front top surface and the outer wall is provided with an outer cylinder tongue and groove. The rear top surface extends backward along the outer wall with an annular steel plate. The annular steel plate and the outer cylinder tongue and groove can be matched and spliced. Multiple first grouting through holes are vertically penetrating inward around the centerline of the outer wall. Multiple prefabricated inner cylinder pipe racks are connected in series along an axis. Each rack has a cylindrical structure with a straight inner side and an undulating outer side. Each prefabricated inner cylinder pipe rack is covered by two adjacent outer cylinders of the jacking pipe. The length of the prefabricated inner cylinder pipe rack is equal to that of the outer cylinder. The two ends of the prefabricated inner cylinder pipe rack are completely flush with the elevation of the center line of the straight section in the middle of the two outer cylinders. The prefabricated inner cylinder pipe rack includes an inner wall and an outer wall. The inner wall is straight. The outer wall, from front to back, consists of a front straight section, an outwardly expanding front extrusion section, a straight middle section, an inwardly narrowing rear extrusion section, and a straight rear straight section. The front extrusion section is in close contact with the rear extrusion section, and the rear extrusion section is in close contact with the front extrusion section.

[0006] Preferably, the front straight section and the rear straight section of the precast inner cylinder of the inner cylinder are provided with grouting recesses at the locations that are in contact with and correspond to the first grouting through hole.

[0007] Preferably, multiple tie rods are installed at both ends of the inner wall of the inner cylinder, and the tie rods at the connecting ends of two adjacent prefabricated inner cylinder tube racks correspond one-to-one and are detachably connected with tie rods.

[0008] Preferably, the prefabricated inner cylinder tube gallery is on the same axis as the outer cylinder of the jacking pipe covering it, and there is a gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder on any normal tangent plane of the axis. The surfaces of the rear extrusion section and the front extrusion section of the outer cylinder are covered with an outer cylinder extrusion rubber layer, and the front extrusion section and the rear extrusion section of the inner cylinder are covered with an inner cylinder extrusion rubber layer. The thickness of the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer after being extruded is equal to the gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder.

[0009] Preferably, after the two outer tubes of the jacking pipe are joined together, an outer tube fixing pin is inserted into the corresponding front fixing hole and rear fixing hole. One end of the outer tube fixing pin is screwed into the rear fixing hole of the jacking pipe outer tube at the front position, and the other end of the outer tube fixing pin is a snap-fit ​​structure. The snap-fit ​​structure can extend into the front fixing hole of the jacking pipe outer tube at the rear position. After the snap-fit ​​structure is locked in the front fixing hole, it cannot be dislodged.

[0010] Preferably, the inner cylinder front extrusion section and the inner cylinder rear extrusion section are each provided with multiple inner cylinder water-stop rubber rings.

[0011] Preferably, the outer cylinder tongue and groove is provided with multiple outer cylinder water-stop rubber rings.

[0012] Preferably, a plurality of second grouting through holes are provided above and below the straight section of the inner cylinder.

[0013] Preferably, the prefabricated inner tube gallery is connected to multiple partition walls.

[0014] Preferably, the construction method of the above-mentioned double-cylinder precast pipe gallery using the pipe jacking method includes the following steps: S1: After all the equipment of the pipe jacking machine is in place, connect the front top surface of the first pipe jacking outer cylinder to the pipe jacking machine in front, and use the jacking device of the pipe jacking machine to push the first pipe jacking outer cylinder and its front top surface connection part to the predetermined construction position, and then restore the hydraulic device of the pipe jacking machine to the initial state. S2: Hoist the first precast inner cylinder pipe gallery section and use tooling to make the axis of the first precast inner cylinder pipe gallery section coincide with the axis of the first jacking pipe outer cylinder section. Use the jacking machine's pressing device to push the first precast inner cylinder pipe gallery section forward until the outer cylinder rear extrusion section and the inner cylinder front extrusion section are in close contact through the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer. Then, insert tie bolts in the corresponding tie supports to complete the initial fixation of the precast inner cylinder pipe gallery section. Then, restore the jacking machine's hydraulic device to the initial state. S3: Screw the outer cylinder fixing pin into the rear fixing hole of the first jacking pipe outer cylinder, hoist the second jacking pipe outer cylinder to the initial position, and align the axis with the first jacking pipe outer cylinder. Use the jacking machine's jacking device to push the second jacking pipe outer cylinder until its front top surface coincides with the rear top surface of the first jacking pipe outer cylinder. At this time, the front extrusion section of the outer cylinder of the second jacking pipe outer cylinder and the rear extrusion section of the inner cylinder are in close contact through the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer. S4: Using grouting equipment, lubricating mud is injected into the soil layer through the first grouting hole. Then, the jacking machine's jacking device pushes the second jacking pipe outer cylinder and all the previous cylinder structures into the soil layer to the set position. Then, the hydraulic device of the jacking machine is restored to the initial state. S5: Repeat S2-S4 until the construction of the double-cylinder precast pipe gallery using the pipe jacking method is completed; S6: Fill all the first grouting through holes and their corresponding grouting recesses with waterproof material or high-grade concrete, and then fill the cavity between the straight section in the inner cylinder and the inner wall of the outer cylinder of the outer jacking pipe by grouting into the second grouting through hole.

[0015] The present invention has at least the following beneficial effects: First, the outer cylinder of the jacking pipe adopted in this invention changes the inner wall of the pipe section in the current conventional process, so that the inner walls of the two outer cylinders can clamp a prefabricated inner cylinder pipe gallery. The single prefabricated inner cylinder pipe gallery is not subjected to jacking force during the jacking process, so its internal partitions and partition walls can be fully prefabricated without worrying about being damaged by force. Secondly, the shape of the prefabricated inner cylinder pipe gallery used in this invention can be easily pushed to the corresponding position after the pipe jacking machine completes a conventional pipe jacking operation, without changing the basic structure of the pipe jacking machine's jacking system. The positioning and installation of the prefabricated inner cylinder pipe gallery is simple and does not affect the overall construction speed and efficiency of the pipe jacking. Third, the combination of the outer cylinder of the jacking pipe and the prefabricated inner cylinder pipe gallery adopted in this invention solves the problem of easy leakage at the joint of the jacking pipe section in the jacking pipe method, and greatly reduces the leakage risk of the prefabricated pipe gallery.

[0016] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0017] Figure 1 This is a general schematic diagram of a double-cylinder prefabricated pipe gallery using the pipe jacking method in one technical solution of the present invention; Figure 2 This is a schematic diagram of the prefabricated inner cylinder pipe gallery of the double-cylinder prefabricated pipe gallery using the pipe jacking method in one technical solution of the present invention; Figure 3 This is a disassembly diagram of the prefabricated inner cylinder pipe gallery and the outer cylinders on both sides of the pipe jacking method in one technical solution of the present invention. Figure 4 This is a schematic diagram of the direction of the top surface of the outer cylinder of the jacking pipe in a double-cylinder prefabricated pipe gallery using the jacking method in one technical solution of the present invention; Figure 5 This is a schematic diagram of the rear top surface of the outer cylinder of the jacking pipe in a double-cylinder prefabricated pipe gallery using the jacking method in one technical solution of the present invention; Figure 6 This is a schematic diagram of the prefabricated inner cylinder pipe gallery of the double-cylinder prefabricated pipe gallery using the pipe jacking method in one technical solution of the present invention; Figure 7 This is a side elevation view of the prefabricated inner cylinder pipe gallery of the double-cylinder prefabricated pipe gallery using the pipe jacking method in one technical solution of the present invention; Figure 8This is a side elevation view of the outer cylinder of the jacking pipe in a double-cylinder prefabricated pipe gallery using the jacking method in one technical solution of the present invention; Figure 9 This is a cross-sectional view of the joint of the outer cylinder of the jacking pipe in a double-cylinder prefabricated pipe gallery using the jacking method in one technical solution of the present invention; Figure 10 This is a schematic diagram of the outer cylinder fixing pin of a double-cylinder prefabricated pipe gallery using the pipe jacking method in one technical solution of the present invention. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can implement it based on the description.

[0019] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0020] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the structures and components described are commercially available. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] like Figures 1-10 As shown, the present invention provides a double-cylinder prefabricated pipe gallery using the pipe jacking method, comprising: Multiple outer cylinders 1 connected in series along an axis are provided. Each outer cylinder 1 has a cylindrical structure with a straight outer side and an undulating inner side. Each outer cylinder 1 includes a front top surface 11, a rear top surface 13, an inner wall 12, and an outer wall 10. The outer wall 10 is straight. The inner wall 12 of the outer cylinder is divided into the following sections from one end of the front top surface 11 to one end of the rear top surface 13: a straight front section 121, an inwardly narrowing front extrusion section 122, a straight middle section 123, an outwardly expanding rear extrusion section 124, and a straight outer cylinder section. The rear straight section 125 has a front fixing hole 110 on the front top surface 11 and a rear fixing hole 130 on the rear top surface. The front fixing hole 110 and the rear fixing hole 130 are in one-to-one correspondence. An outer cylinder tongue and groove 14 is provided at the junction of the front top surface 11 and the outer cylinder outer wall 10. An annular steel plate 131 extends rearward along the outer side wall of the rear top surface 13. The annular steel plate 131 and the outer cylinder tongue and groove 14 can be matched and spliced. Multiple first grouting through holes 101 are vertically penetrating inward around the centerline of the outer cylinder outer wall 10. Multiple prefabricated inner cylinder pipe corridors 2 are connected in series along an axis. Each corridor has a cylindrical structure with a straight inner side and an undulating outer side. Each prefabricated inner cylinder pipe corridor 2 is covered by two adjacent outer cylinders 1 of the jacking pipe. The length of each prefabricated inner cylinder pipe corridor 2 is equal to that of each outer cylinder 1. The two ends of each prefabricated inner cylinder pipe corridor 2 are completely flush with the elevation of the centerline of the straight section 123 in each of the two outer cylinders. Each prefabricated inner cylinder pipe corridor 2 includes an inner cylinder inner wall 21 and an inner cylinder outer wall 22. The inner wall 21 of the inner cylinder is straight. The outer wall 21 of the inner cylinder consists of, from front to back, a straight front section 221 of the inner cylinder, an outwardly expanding front extrusion section 222 of the inner cylinder, a straight middle section 223 of the inner cylinder, an inwardly narrowing rear extrusion section 224 of the inner cylinder, and a straight rear section 225 of the inner cylinder. The front extrusion section 222 of the inner cylinder is in close contact with the rear extrusion section 124 of the outer cylinder, and the rear extrusion section 224 of the inner cylinder is in close contact with the front extrusion section 222 of the outer cylinder.

[0022] In this technical solution, the outer cylinder 1 of the jacking pipe is a rectangular or circular cross-section concrete cylinder designed according to the overall pipe gallery design requirements. As the main load-bearing component in the jacking pipe construction, the outer cylinder 1 is not only made of high-strength impermeable concrete, but also requires strict measurement, correction, and reinforcement of the casting template to ensure that the dimensional error of the outer cylinder 1 component in any direction does not exceed 4mm. The outer wall of the outer cylinder 1 is straight to ensure that there is no additional obstruction when it is pushed forward in the soil. The inner wall of the outer cylinder 1 is hourglass-shaped with a narrow middle and wide ends. The overall outer shape of the prefabricated inner cylinder pipe gallery 2 is spindle-shaped with a wide middle and narrow ends. After the two outer cylinders 1 are spliced ​​together, the cavity in the middle can just accommodate the designed gap. A prefabricated inner cylinder pipe gallery 2, the theoretical length of which is the length of the outer cylinder 1 of the jacking pipe. To ensure that it can be better enclosed in the outer cylinder 1 of the jacking pipe, the length needs to be appropriately reduced. The gap between the outer cylinder 1 of the jacking pipe and the prefabricated inner cylinder pipe gallery 2 is covered by a rubber pad with good elasticity that is pre-covered on the surfaces of the front extrusion section 122 of the outer cylinder, the rear extrusion section 124 of the outer cylinder, the front extrusion section 222 of the inner cylinder, and the rear extrusion section 224 of the inner cylinder. When the outer cylinders 1 of the jacking pipe on both sides of the prefabricated inner cylinder pipe gallery 2 are installed in place, the prefabricated inner cylinder pipe gallery 2 is clamped by both sides, and can move synchronously with the outer cylinder 1 of the jacking pipe without being subjected to a large jacking force during the jacking pipe construction, thus avoiding damage to the internal walls or other prefabricated components.

[0023] In another technical solution, the front straight section 221 and the rear straight section 225 of the precast inner cylinder of the inner cylinder 2 are provided with grouting recesses 24 at the positions that are attached to and correspond to the first grouting through hole 110. Since most of the outer cylinder 1 of the jacking pipe is located in the soil layer during the jacking construction, it is necessary to inject lubricating mud into the surrounding soil to reduce frictional resistance. In order to facilitate the laying of grouting pipes inside the pipe body, grouting recesses 24 are opened at both ends of the precast inner cylinder 2 to facilitate the grouting process. After the jacking process is completed, the openings and holes of the grouting recesses 24 will be sealed manually.

[0024] In another technical solution, the tie supports 210 at the joint ends of two adjacent precast inner cylinder pipe racks 2 correspond one-to-one and are detachably connected with tie rods 211. Due to the special construction sequence of the outer pipe jacking cylinder 1 and the precast inner cylinder pipe rack 2 one after another, after the precast inner cylinder pipe rack 2 is pushed into the previous outer pipe jacking cylinder 1, the latter half of the precast inner cylinder pipe rack 2 is in a state without good fixing measures. In order to prevent the precast inner cylinder pipe rack 2 from shifting when pushing the next outer pipe jacking cylinder 1, it is necessary to fix the situation at this time. The prefabricated inner cylinder tube gallery 2 is fixed and constrained. The tie rod 210 is detachably connected to the inner wall 21 of the inner cylinder. One end of the tie bolt 211 is inserted and fixed to the tie rod 210 of the prefabricated inner cylinder tube gallery 2 that has not been installed. The other end of the tie bolt 211 is inserted and fixed to the tie rod 210 of the previous section of the prefabricated inner cylinder tube gallery 2. After the front and rear of this section of the prefabricated inner cylinder tube gallery 2 are tightly covered, the tie bolt 211 can be removed. The tie rod 210 can be removed at the same time later.

[0025] In another technical solution, the prefabricated inner cylinder tube gallery 2 and the outer cylinder 1 covering it are on the same axis, and on any normal tangent plane of the axis, there is a gap between the inner wall 21 of the outer cylinder and the outer wall 12 of the inner cylinder. The surfaces of the rear extrusion section 124 and the front extrusion section 122 of the outer cylinder are covered with an outer cylinder extrusion rubber layer 126, and the front extrusion section 222 and the rear extrusion section 224 of the inner cylinder are covered with an inner cylinder extrusion rubber layer 25. The outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25 are subjected to compression. The thickness after the gap is equal to the interval between the inner wall 12 of the outer cylinder and the outer wall 21 of the inner cylinder. The gap between the inner wall 12 of the outer cylinder and the outer wall 21 of the inner cylinder is for practical engineering considerations. The purpose of the gap is to facilitate the smooth push of the prefabricated inner cylinder tube gallery 2 into the outer cylinder 1 of the jacking pipe. The total thickness of the outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25 when uncompressed is greater than the design gap. The ultimate compression of the outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25 without failure is less than the design gap.

[0026] In another technical solution, after the two outer cylinders 1 of the jacking pipe are joined together, an outer cylinder fixing pin 132 is inserted into the corresponding front fixing hole 110 and rear fixing hole 130. One end of the outer cylinder fixing pin 132 is threaded into the rear fixing hole of the jacking pipe outer cylinder at the front position, and the other end of the outer cylinder fixing pin is a snap-fit ​​structure 1322. The snap-fit ​​structure 1322 can extend into the front fixing hole 110 of the jacking pipe outer cylinder 1 at the rear position. After the snap-fit ​​structure 1322 is locked in the front fixing hole 110, it cannot be dislodged. In this technical solution, since there is no reliable connection between the outer cylinders of the jacking pipe, In order to prevent pipe section misalignment, deviation, and separation during pipe jacking construction, the front fixing hole 110 is a hole with an enlarged end. The buckling structure 1322 can first extend and retract into the front half of the front fixing hole 110. When the buckling structure 1322 is pushed to the enlarged end of the fixing hole 110, the buckling structure 1322 will naturally open and lock. The two ends of the outer cylinder fixing pin 132 are respectively constrained to the two connected outer cylinders 1 of the jacking pipe, which can effectively prevent relative displacement between the two. In addition, the outer cylinder fixing pin 132 is easy to install and plays a positioning assistance role during the installation of the outer cylinder 1 of the jacking pipe.

[0027] In another technical solution, multiple inner cylinder water-stop rubber rings 26 are provided on the inner cylinder front extrusion section 222 and the inner cylinder rear extrusion section 224. The inner cylinder water-stop rubber rings 26 are annular structures with wedge-shaped cross sections. The inner cylinder water-stop rubber rings 26 have a certain elasticity and play a water-stopping role between the outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25.

[0028] In another technical solution, the outer cylinder tongue and groove 14 is provided with multiple outer cylinder water-stop rubber rings 141. The outer cylinder water-stop rubber rings 141 are annular structures with a wedge-shaped cross section and good deformation capacity. When the annular steel plate 131 is matched and spliced ​​on the outer cylinder tongue and groove 14, the outer cylinder water-stop rubber rings 141 are squeezed and deformed and completely seal the gap between the annular steel plate 131 and the outer cylinder tongue and groove 14.

[0029] In another technical solution, multiple second grouting through holes 23 are provided above and below the straight section 223 of the inner cylinder. In this technical solution, since there is an annular cavity between the straight section 223 of the inner cylinder and the straight section 123 of the outer cylinder, this annular cavity is located at the joint of the two sections of the outer cylinder 1 of the jacking pipe. In order to fill this cavity after construction to further improve the anti-leakage ability of the precast inner cylinder pipe gallery 2, epoxy resin and other anti-leakage consolidation materials are injected into the cavity through the second grouting through holes 23. The second grouting through holes 23 can also be used as lifting points for the precast inner cylinder pipe gallery 2 during hoisting.

[0030] In another technical solution, the prefabricated inner cylinder pipe gallery 2 is connected to multiple partition walls 27. The partition walls 27 can be cast together with the prefabricated inner cylinder pipe gallery 2, or they can be installed later as assemblable components. The gaps in the partition walls 27 will be sealed uniformly after the overall construction of the pipe gallery is completed. The partition walls 27 do not need to be considered for stress in all construction stages.

[0031] In another technical solution, the construction method of the above-mentioned double-cylinder prefabricated pipe gallery using the pipe jacking method includes the following steps: S1: After all the equipment of the pipe jacking machine is in place, connect the front top surface 11 of the first pipe jacking outer cylinder 1 to the pipe jacking machine in front, and use the jacking machine's jacking device to push the first pipe jacking outer cylinder 1 and its front top surface 11 connection part to the predetermined construction position, and then restore the pipe jacking machine's hydraulic device to the initial state. S2: Hoist the first precast inner cylinder tube gallery 2, and use tooling to make the axis of the first precast inner cylinder tube gallery 2 coincide with the axis of the first jacking pipe outer cylinder 1. Use the jacking machine's pressing device to push the first precast inner cylinder tube gallery 2 forward until the outer cylinder rear extrusion section 124 and the inner cylinder front extrusion section 222 are in close contact through the outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25. Then, insert tie bolts 211 in the corresponding tie supports 21 to complete the initial fixation of the precast inner cylinder tube gallery 2. Then, restore the hydraulic device of the jacking machine to the initial state. S3: Screw the outer cylinder fixing pin 132 into the rear fixing hole 130 of the first jacking pipe outer cylinder 1, hoist the second jacking pipe outer cylinder 1 to the initial position, and align the axis with the first jacking pipe outer cylinder 1. Use the jacking machine's jacking device to push the second jacking pipe outer cylinder 1 until its front top surface 11 coincides with the rear top surface 13 of the first jacking pipe outer cylinder. At this time, the outer cylinder front extrusion section 122 of the second jacking pipe outer cylinder 1 and the inner cylinder rear extrusion section 224 are in close contact through the outer cylinder extrusion rubber layer 126 and the inner cylinder extrusion rubber layer 25. S4: Using grouting equipment, lubricating mud is injected into the soil layer through the first grouting hole 110. Then, the jacking machine's jacking device pushes the second jacking pipe outer cylinder 1 and all the previous cylinder structures into the soil layer to the set position. Then, the hydraulic device of the jacking machine is restored to the initial state. S5: Repeat S2-S4 until the construction of the double-cylinder precast pipe gallery using the pipe jacking method is completed; S6: Fill all the first grouting through holes 110 and their corresponding grouting recesses 24 with waterproof material or high-grade concrete, and then fill the cavity between the straight section 223 in the inner cylinder and the inner wall 12 of the outer cylinder of the outer cylinder 1 of the outer jacking pipe 1 with grout by injecting grout into the second grouting through hole 23.

[0032] In step S1 of this technical solution, the first section of the outer cylinder 1 of the jacking pipe needs to be specially connected to the jacking machine equipment in front to ensure a tight connection. The broken soil generated by the jacking machine can be discharged from the pipe body to the rear by means of mud pump or trolley transportation. In step S2, the pushing length of the jacking machine's jacking device is greater than 1.5 times the length of the outer cylinder 1 of the jacking pipe. The jacking machine's jacking device acts directly on the rear top surface 13 of the outer cylinder 1 of the jacking pipe. When pushing the precast inner cylinder pipe gallery 2, the jacking machine's jacking device can be equipped with special tooling or directly pushed by a separate small hydraulic press. In step S6, since the cavity between the inner wall 12 of the outer cylinder of the outer cylinder 1 of the outer jacking pipe is annular, grout is first injected into the second grouting through hole 23 below during the grouting process. The grout fills the cavity along the annular upward under pressure.

[0033] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A prefabricated double-cylinder pipe gallery using the pipe jacking method, characterized in that, include: Multiple jacking pipe outer cylinders are connected in series along an axis. The outer cylinder has a cylindrical structure with a straight outer side and an undulating inner side. The outer cylinder includes a front top surface, a rear top surface, an inner wall, and an outer wall. The outer wall is straight. The inner wall of the outer cylinder is divided into a straight front straight section, a front extrusion section with an inwardly narrowing diameter, a straight middle straight section, a rear extrusion section with an outwardly expanding diameter, and a straight rear straight section from one end of the front top surface to one end of the rear top surface. The front top surface has a front fixing hole, and the rear top surface has a rear fixing hole. The positions of the front fixing hole and the rear fixing hole correspond one-to-one. The junction of the front top surface and the outer wall is provided with an outer cylinder tongue and groove. The rear top surface extends backward along the outer wall with an annular steel plate. The annular steel plate and the outer cylinder tongue and groove can be matched and spliced. Multiple first grouting through holes are vertically penetrating inward around the centerline of the outer wall. Multiple prefabricated inner cylinder pipe racks are connected in series along an axis. Each rack has a cylindrical structure with a straight inner side and an undulating outer side. Each prefabricated inner cylinder pipe rack is covered by two adjacent outer cylinders of the jacking pipe. The length of the prefabricated inner cylinder pipe rack is equal to that of the outer cylinder. The two ends of the prefabricated inner cylinder pipe rack are completely flush with the vertical surfaces where the center lines of the straight sections of the two outer cylinders are located. The prefabricated inner cylinder pipe rack includes an inner wall and an outer wall. The inner wall is straight. The outer wall, from front to back, consists of a front straight section, an outwardly expanding front extrusion section, a straight middle section, an inwardly contracting rear extrusion section, and a straight rear straight section. The front extrusion section is in close contact with the rear extrusion section, and the rear extrusion section is in close contact with the front extrusion section. The inner wall of the outer cylinder of the jacking pipe is shaped like an hourglass with a narrow middle and wide ends. The overall outer shape of the prefabricated inner cylinder pipe gallery is shaped like a spindle with a wide middle and narrow ends. After the two outer cylinders of the jacking pipe are joined together, the cavity in the middle can just accommodate a prefabricated inner cylinder pipe gallery with the designed gap. The prefabricated inner cylinder tube gallery is on the same axis as the outer cylinder of the jacking pipe covering it, and there is a gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder on any normal tangent plane of the axis. The surfaces of the rear extrusion section and the front extrusion section of the outer cylinder are covered with an outer cylinder extrusion rubber layer, and the front extrusion section and the rear extrusion section of the inner cylinder are covered with an inner cylinder extrusion rubber layer. The thickness of the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer after being extruded is equal to the gap between the inner wall of the outer cylinder and the outer wall of the inner cylinder.

2. The prefabricated double-cylinder pipe gallery using the pipe jacking method as described in claim 1, characterized in that, The front straight section and rear straight section of the precast inner cylinder of the pipe gallery are provided with grouting recesses at the locations that are in contact with and correspond to the first grouting through hole.

3. The prefabricated double-cylinder pipe gallery using the pipe jacking method as described in claim 1, characterized in that, Multiple tie rods are installed at both ends of the inner wall of the inner cylinder. The tie rods at the joint ends of two adjacent precast inner cylinder pipe racks correspond one-to-one and are detachably connected with tie rods.

4. The prefabricated double-cylinder pipe gallery using the pipe jacking method as described in claim 1, characterized in that, After the two outer tubes of the jacking pipe are joined together, an outer tube fixing pin is inserted into the corresponding front fixing hole and rear fixing hole. One end of the outer tube fixing pin is screwed into the rear fixing hole of the jacking pipe outer tube at the front position, and the other end of the outer tube fixing pin is a snap-fit ​​structure. The snap-fit ​​structure can extend into the front fixing hole of the jacking pipe outer tube at the rear position. After the snap-fit ​​structure is locked in the front fixing hole, it cannot be removed.

5. The precast double-cylinder pipe gallery using the pipe jacking method as described in claim 4, characterized in that, Multiple inner cylinder water-stop rubber rings are provided on both the front extrusion section and the rear extrusion section of the inner cylinder.

6. The prefabricated double-cylinder pipe gallery using the pipe jacking method as described in claim 5, characterized in that, The outer cylinder tongue and groove is equipped with multiple outer cylinder water-stop rubber rings.

7. The precast double-cylinder pipe gallery using the pipe jacking method as described in claim 6, characterized in that, Multiple second grouting through holes are provided above and below the straight section of the inner cylinder.

8. The prefabricated double-cylinder pipe gallery using the pipe jacking method as described in claim 7, characterized in that, The prefabricated inner tube gallery is connected to multiple partition walls.

9. The construction method of the double-cylinder precast pipe gallery using the pipe jacking method as described in claim 8, characterized in that, Includes the following steps: S1: After all the equipment of the pipe jacking machine is in place, connect the front top surface of the first pipe jacking outer cylinder to the pipe jacking machine in front, and use the jacking device of the pipe jacking machine to push the first pipe jacking outer cylinder and its front top surface connection part to the predetermined construction position, and then restore the hydraulic device of the pipe jacking machine to the initial state. S2: Hoist the first precast inner cylinder pipe gallery section and use tooling to make the axis of the first precast inner cylinder pipe gallery section coincide with the axis of the first jacking pipe outer cylinder section. Use the jacking machine's pressing device to push the first precast inner cylinder pipe gallery section forward until the outer cylinder rear extrusion section and the inner cylinder front extrusion section are in close contact through the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer. Then, insert tie bolts in the corresponding tie supports to complete the initial fixation of the precast inner cylinder pipe gallery section. Then, restore the jacking machine's hydraulic device to the initial state. S3: Screw the outer cylinder fixing pin into the rear fixing hole of the first jacking pipe outer cylinder, hoist the second jacking pipe outer cylinder to the initial position, and align the axis with the first jacking pipe outer cylinder. Use the jacking machine's jacking device to push the second jacking pipe outer cylinder until its front top surface coincides with the rear top surface of the first jacking pipe outer cylinder. At this time, the front extrusion section of the outer cylinder of the second jacking pipe outer cylinder and the rear extrusion section of the inner cylinder are in close contact through the outer cylinder extrusion rubber layer and the inner cylinder extrusion rubber layer. S4: Using grouting equipment, lubricating mud is injected into the soil layer through the first grouting hole. Then, the jacking machine's jacking device pushes the second jacking pipe outer cylinder and all the previous cylinder structures into the soil layer to the set position. Then, the hydraulic device of the jacking machine is restored to the initial state. S5: Repeat S2-S4 until the construction of the double-cylinder precast pipe gallery using the pipe jacking method is completed; S6: Use waterproof material to fill all the first grouting through holes and their corresponding grouting recesses, and then fill the cavity between the straight section in the inner cylinder and the inner wall of the outer cylinder of the outer jacking pipe by injecting grout into the second grouting through hole.

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