Construction method of multi-pipeline under-railway bridge pipe jacking

Abstract

The application discloses a kind of multiple pipeline under railway bridge pipe-rodding construction methods, comprising the following steps: S1, construction jacking working well and receiving working well;S2, in jacking working well, water supply pipe and sewage pipe-rodding construction are carried out, water supply pipe and sewage pipe are according to pipe-rodding construction procedure, and the pipe-rodding of construction includes first section pipe section and general pipe section, and the pipe wall of first section pipe section is peripherally arranged with multiple round hole pipe pieces;S3, support is placed in water supply pipe and sewage pipe;S4, water supply pipe and sewage pipe are respectively jacked into top channel, and multiple pipelines are fixed on support;S5, water supply pipe and sewage pipe are filled with cement mortar.The special jacking working well and receiving working well of the application, special pipeline structure arrangement form, prevent pollution;Anchor rod is constructed in pipe section, and surrounding rock is reinforced, is suitable for the pipe-rodding construction of multiple pipe diameter requirements, is convenient for construction, saves investment, quality is good, avoids the occurrence of leakage phenomenon.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and in particular to a construction method for multiple pipes passing under a railway bridge via pipe jacking. Background Technology

[0002] With rapid economic development, major cities are vigorously promoting transportation construction, with more and more subways, railways, highways, and municipal roads. The continuous development of urban scale necessitates the improvement of urban infrastructure, requiring the laying of various pipelines. To save above-ground space, most pipelines are currently laid underground. However, excavating and laying pipelines in densely populated urban areas or along main roads has a significant impact on surrounding residents and traffic. Therefore, pipe jacking construction is being used more and more widely in urban pipeline construction.

[0003] When pipelines need to be jacked underground, situations sometimes arise where they simultaneously pass under subways, highways, and municipal roads. Pipe jacking is a commonly used method. Along municipal roads, there are often rainwater pipes, power lines, power tunnels, sewage pipes, communication lines, gas pipes, water pipes, and water supply pipes. When pipelines pass under railways, multiple water supply pipes, greywater pipes, and drainage pipes inevitably appear. Especially considering the special nature of passing under railways, backup water supply and drainage pipes are often provided. This setup results in multiple water supply (greywater) and drainage pipes passing under the railway simultaneously. Because water supply pipes have high safety and cleanliness requirements, they cannot be too close to drainage pipes, otherwise it will affect the use of the water supply pipes and cause negative pollution. If water supply and sewage pipes are jacked separately, it will result in significant investment, increased working shafts, and the pipes being too close to the railway during jacking does not meet regulations and easily leads to safety accidents. Therefore, designing a multi-pipeline underground railway jacking scheme, jacking working shafts, and improving the accuracy and precision of the jacking process are crucial.

[0004] Meanwhile, poor soil conditions pose a significant instability to pipe jacking construction. This is because manual excavation during the jacking process disturbs the soil, resulting in a large amount of excavated soil with each jacking step, which can easily cause collapses in front of the pipe. Large chunks of reinforced soil may collapse, along with ungrouted soil. Furthermore, the quality of construction cannot be guaranteed during jacking, and frequent collapses severely impact construction progress and safety. Therefore, it is necessary to reinforce the underlying rock strata inside the pipe during pipe jacking, especially at special locations such as those crossing railways, subways, and highways. Currently, the conventional method for reinforcing the rock strata in pipe jacking is surface grouting. However, surface grouting has high requirements and is cumbersome. When multiple pipes are passing under railways, there are too many underground pipelines, limiting the reinforcement to shallow surface layers and preventing reinforcement of deeper strata and pipe foundations. Surface grouting is therefore unsuitable for situations where multiple pipes pass under railways. Summary of the Invention

[0005] The purpose of this invention is to overcome the limitations of multiple pipelines passing under a railway bridge, such as the complex pipeline network, mutual interference and pollution, and restrictions on surface grouting, and to provide a construction method for multiple pipelines passing under a railway bridge via pipe jacking.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] A construction method for multiple pipes passing under a railway bridge via pipe jacking includes the following steps:

[0008] Step S1: Construct the jacking working shaft and the receiving working shaft; the jacking working shaft is equipped with a first working chamber and a second working chamber, the first working chamber is used for jacking the water supply pipe, and the second working chamber is used for jacking the sewage pipe, and the receiving working shaft is correspondingly equipped with a first receiving chamber and a second receiving chamber;

[0009] Step S2: Along the designed axis of the construction pipeline, the water supply pipe jacking and the sewage pipe jacking are constructed in the jacking working shaft. The water supply pipe jacking and the sewage pipe jacking are constructed according to the pipe jacking construction steps. The constructed pipe jacking includes a first pipe section and a general pipe section. The first pipe section has multiple perforated segments arranged circumferentially on its pipe wall. The pipe jacking construction steps include the following:

[0010] Step S21: In the jacking working shaft, the first pipe section is jacked in, the circular hole segment of the pipe wall of the first pipe section is opened, and anchor bolts are installed in the surrounding soil layer.

[0011] Step S22: Continue jacking the universal pipe section. For each section jacked in, anchor bolts are installed on the first pipe section according to step S21. After jacking all the universal pipe sections, the first pipe section is jacked out to the receiving working well.

[0012] Step S3: Place brackets inside the water supply pipe and the sewage pipe. There are multiple brackets, and the multiple brackets are spaced apart along the length of the pipe.

[0013] Step S4: Use a pipe jacking machine to push the water supply pipe and sewage pipe into the jacking pipe respectively, and fix the multiple pipes on the support;

[0014] Step S5: Fill the water supply pipe and the sewage pipe with cement mortar.

[0015] In the technical solution of this invention, multiple pipes are integrated within the jacking pipe, including multiple water supply pipes and sewage pipes, which are jacked synchronously. The water supply and sewage pipes form two jacking working shafts and a receiving shaft chamber, respectively. That is, the water supply and sewage are together in the jacking working shaft, while the jacking working shaft and the receiving working shaft are separated into two chambers, a clean area and a contaminated area, to prevent contamination. During jacking, the first pipe section has detachable perforated segments on its wall. The perforated segments are pre-reserved and can be opened to provide anchor rods for underground construction in adverse geological conditions from inside the pipe. The anchor rods can reinforce the surrounding rock strata. The general-purpose pipe section is a jacking pipe with a general structure. The first pipe section with perforated segments is jacked out to the receiving shaft and cannot be used as a permanent pipe. A support is set inside the jacking pipe to facilitate pipe installation, control of elevation, and fixation of pipe position. The multiple pipes include water supply pipes, drainage pipes, and reclaimed water pipes. The pipes are jacked into the pipes using a pipe jacking machine, then the pipes are installed, placed on the support, and finally, cement mortar is filled inside the jacking pipe.

[0016] As a preferred embodiment of the present invention, the first working chamber is further provided with a greywater pipe, and the greywater pipe and the water supply pipe enter the first receiving chamber of the receiving working well in the same water supply jacking pipe.

[0017] As a preferred embodiment of the present invention, after the anchor bolt is installed, the circular hole segment is sealed with a flange to prevent groundwater from entering the pipeline through the circular hole segment.

[0018] In a preferred embodiment of the present invention, a laser emitting device and a laser receiving device are installed inside the jacking shaft, and a laser reflecting device is installed on the first pipe section or the support. During the pipe jacking construction step, the laser reflecting device is installed on the first pipe section; during support installation, the laser reflecting device is installed on the support. The laser path is designed according to the design axis of the construction pipeline. The laser is emitted from the laser emitting device and reflected by the laser reflecting device into the laser receiving device, thereby determining whether the jacking pipe or support is installed correctly. When the light from the laser reflecting device to the laser receiving device exceeds a certain normal range, it indicates that deflection has occurred. Using a laser for positioning ensures that the jacking pipe is not deviated when jacking along the slope, and can also be used to prevent deviation during the subsequent installation of water supply and sewage pipes along the slope.

[0019] As a preferred embodiment of the present invention, the support is a steel support, which has the advantages of high strength and durability. The jacking length of the large-diameter pipe is large at one time, which facilitates the control of the pipe height and fixation of the pipe position.

[0020] As a more preferred embodiment of the present invention, multiple pipes are fixed to the bracket using pipe clamps.

[0021] As a preferred embodiment of the present invention, to prevent cement mortar loss during the filling process, a blind flange is used to seal the downstream side of the jacking pipe, and full-section cement mortar grouting is performed from the downstream side of the jacking pipe to the upstream side. In the present invention, the downstream side of the jacking pipe refers to the side with a lower elevation, and the upstream side of the jacking pipe refers to the side with a higher elevation.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention features multiple pipes within the jacking system, including multiple water supply pipes and sewage pipes, which are integrated for synchronous jacking. The water supply and sewage pipes form two jacking working shafts and a receiving shaft chamber, respectively. That is, the water supply and sewage are combined in the jacking working shaft, while the jacking working shaft and the receiving working shaft are separated into two chambers, a clean area and a contaminated area. The water supply pipes and sewage pipes are jacked separately within the pipe jacking system. The special jacking working shaft and receiving working shaft, along with the special pipe structure and arrangement, prevent contamination.

[0024] 2. This invention involves installing anchor bolts inside the pipe jacking section. These anchor bolts reinforce the surrounding rock strata, unlike conventional surface grouting methods. This invention is suitable for pipe jacking construction with various pipe diameter requirements, facilitating construction, saving investment, ensuring high quality, and preventing leakage. Attached Figure Description

[0025] Figure 1 A flowchart illustrating the construction method of multiple pipes passing under a railway bridge via pipe jacking;

[0026] Figure 2 This is a plan view of the north jacking shaft in Example 1;

[0027] Figure 3 This is a cross-sectional view of the north side jacking shaft in Example 1;

[0028] Figure 4 This is a plan view of the receiving working well in Example 1;

[0029] Figure 5 This is a cross-sectional view of the receiving working well in Example 1;

[0030] Figure 6 This is a plan view of the south jacking shaft in Example 1;

[0031] Figure 7 This is a cross-sectional view of the south jacking shaft in Example 1;

[0032] Figure 8 This is a cross-sectional view of the first pipe section in Example 1;

[0033] Figure 9 This is a cross-sectional view of the sewage jacking pipe in Example 1;

[0034] The markings in the diagram are: 1-jacking working shaft, 11-first working chamber, 12-second working chamber, 13-inspection hole, 14-sump, 2-receiving working shaft, 21-first receiving chamber, 22-second receiving chamber, 3-water supply pipe, 4-reclaimed water pipe, 5-sewage pipe, 6-jacking pipe, 61-first pipe section, 62-general pipe section, 71-round hole segment, 72-anchor bolt, 73-support, 81-railway, 82-expressway auxiliary road, 83-subway. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0036] Example 1

[0037] The pipelines provided in this embodiment include a water supply pipe 3, a reclaimed water pipe 4, and a drainage pipe 5. The pipelines need to cross railway 81, expressway auxiliary road 82, and railway 81. Each type of pipeline will have a backup. There are situations where multiple pipelines cross railway 81 or expressway. Since the jacking pipe 6 is prone to causing instability in the surrounding rock strata or is itself unstable, it is necessary to reinforce the rock strata above the jacking pipe 6. Especially at special node locations such as crossing railway 81 and expressway, there are too many underground pipelines crossing railway 81. Only shallow surface ground reinforcement is possible. It is not possible to reinforce the deep strata and pipeline foundation below the pipelines. Surface grouting cannot be used for rock strata reinforcement.

[0038] Therefore, this embodiment provides a construction method for multiple pipes passing under a railway bridge jacking pipe, such as... Figure 1 As shown, it includes the following steps:

[0039] Step S1: Construct the jacking working shaft 1 and the receiving working shaft 2; the jacking working shaft 1 is provided with a first working chamber 11 and a second working chamber 12, the first working chamber 11 is used to jack the water supply pipe 3, the second working chamber 12 is used to jack the sewage pipe 55, and the receiving working shaft 2 is provided with a first receiving chamber 21 and a second receiving chamber 22.

[0040] Step S2: Along the designed axis of the construction pipeline, the water supply pipe jacking and the sewage pipe jacking are constructed in the jacking working shaft 1. The water supply pipe jacking and the sewage pipe jacking are constructed according to the pipe jacking 6 construction steps. The constructed pipe jacking 6 includes a first pipe section 61 and a general pipe section 62. The first pipe section 61 has multiple perforated pipe segments 71 arranged circumferentially on its pipe wall. The pipe jacking 6 construction steps include the following:

[0041] Step S21: In the jacking working shaft 1, the first pipe section 61 is jacked in, the circular hole segment 71 of the pipe wall of the first pipe section 61 is opened, and the anchor bolts 72 are installed in the surrounding soil layer. After the construction is completed, the anchor bolts are fixed with adjustable fixing rings.

[0042] Step S22: Continue jacking the universal pipe section 62. For each section jacked in, anchor bolts 72 are installed on the first pipe section 61 according to step S21. After jacking all the universal pipe sections 62, the first pipe section 61 is jacked out to the receiving working well 2.

[0043] Step S3: Place brackets 73 inside the water supply pipe and the sewage pipe. There are multiple brackets 73, and the multiple brackets 73 are spaced apart along the length of the pipe 6.

[0044] Step S4: Use a pipe jacking machine to push the water supply pipe 3 and the sewage pipe 5 into the jacking pipe respectively, and fix the multiple pipes on the support 73;

[0045] Step S5: Fill the water supply pipe and the sewage pipe with cement mortar.

[0046] During step S1, the jacking shaft 1 and receiving shaft 2 are laid out according to the design drawings. The excavation line is marked at the construction location, and the jacking shaft 1 and receiving shaft 2 are constructed simultaneously based on the direction of the excavation line. Figures 2-7 As shown, this embodiment has one receiving working shaft 2 and two jacking working shafts 1. Both the jacking working shaft 1 and the receiving working shaft 2 are equipped with inspection holes 13 and water collection pits 14. The jacking working shafts 1 include a south jacking working shaft 1 and a north jacking working shaft 1. The receiving working shaft 2 is located in the middle of the railway 81, between the two jacking working shafts 1. Pipe jacking 6 construction proceeds from the south jacking working shaft 1 and the north jacking working shaft 1 towards the receiving working shaft 2. The south jacking working shaft 1 and the north jacking working shaft 1 can perform jacking operations simultaneously or separately.

[0047] The first chamber 11 of the north-side jacking working well 1 is used to jack up the three water supply pipes. In addition, the first chamber 11 is also equipped with a greywater pipe 4. The greywater pipe 4 and the water supply pipe 3 enter the first receiving chamber 21 of the receiving working well 2 in the same water supply jacking pipe. That is to say, in this embodiment, the north-side jacking working well 1 needs to jack up the water supply pipe 3, the greywater pipe 4, and the sewage pipe 5. The south-side jacking working well 1 is used to jack up the water supply pipe 3 and the greywater pipe 4. The greywater pipe 4 and the water supply pipe 3 of the south-side jacking working well 1 enter the first receiving chamber 21 of the receiving working well 2 in the same water supply jacking pipe 6. The sewage pipe 5 has a specification of DN150, and the greywater pipe 4 has a specification of DN300. The second chamber 12 is used to jack up the sewage pipe. The sewage pipe 5 enters the second receiving chamber 22 from the sewage pipe 6. The sewage pipe 5 has a specification of DN600. The sewage pipe 5 enters the receiving working well 2 and then connects to the municipal sewage main pipe in the receiving working well 2, directly flowing into the municipal sewage main pipe.

[0048] In this embodiment, the jacking pipe 6 is DN1600. Before jacking the first pipe section 61, a working hole is reserved on the inner wall of the jacking working shaft 1 near the receiving working shaft 2 along the design axis of the construction pipeline. The construction equipment is installed first. A rear support wall is installed on the inner wall of the jacking working shaft 1 away from the receiving working shaft 2 after the construction is completed and reinforced. Symmetrically distributed main jacking cylinders and guide rails for pipe section movement are installed on the rear support wall. The pipe section to be jacked is placed on the guide rail in front of the main jacking cylinder using a crane. The jacking machine is installed at the front of the pipe section. The main jacking cylinder applies jacking force to the pipe section, pushing the jacking machine and the first pipe section 61 through the working hole into the soil. When the main jacking cylinder reaches its maximum stroke, it retracts. A jacking iron is placed between the main jacking cylinder and the pipe section to fill the retraction stroke and increase the jacking distance of the main jacking cylinder. After the jacking iron is placed, the main jacking cylinder jacks forward again. In this cycle, jacking irons are added, and the jacking machine and pipe section continue to advance.

[0049] The main jacking system of the jacking working shaft 1 has two 200T double-stroke constant thrust hydraulic cylinders, with a total thrust of 400T. The two double-stroke hydraulic cylinders are assembled in a cylinder frame, and the center position of the two cylinders after installation must be aligned with the design. Figure 1 The hydraulic cylinders are symmetrically arranged along the longitudinal axis to ensure optimal jacking resistance and support. The center error of the installed cylinders should be less than 5mm. The main jacking hydraulic power unit is supplied with oil by two high-flow-rate axial piston pumps, employing large-diameter solenoid valves and system piping to reduce system damping. The cylinders can operate individually or in tandem. The main jacking system is controlled by a PLC programmable logic controller (PLC) and uses a frequency converter for stepless speed regulation. The main jacking system control panel is located in the ground control room.

[0050] During the jacking process, to ensure the pipe jacking between the two wells and that the lateral and vertical errors are less than 100mm, ground traverse points were buried near both end wells. Using these aerial and ground traverse points, the plane control results were transferred to the construction site via traverse surveying. A plane control network was established using the aerial and ground traverse points. Traverse surveying was conducted using a SET2B total station, with direction observations repeated, angle measurement accuracy +1", and distance measurement repeated, with bidirectional observations and a relative distance measurement error <1 / 80000. The observation results were then adjusted. The transfer of coordinates from the surface wells to the underground wells was achieved using a connecting triangle method. The reference point for controlling the jacking direction underground was fixed using a steel frame, and a 2" theodolite was used to track and observe the plane deviation direction of the jacking head.

[0051] After the first pipe section 61 is fully inserted into the soil, the main jacking cylinder is retracted, and the universal pipe section 62 is hoisted onto the guide rail in front of the main jacking cylinder. The main jacking cylinder applies jacking force to the pipe section, pushing it through the working hole and into the soil. The first pipe section 61 has detachable perforated segments 71 on its wall. Figure 8 As shown, the perforated pipe segment 71 is pre-reserved. When the perforated pipe segment 71 is opened, it can be used to install the underground anchor rod 72 from inside the pipe to reinforce the rock strata in adverse geological conditions.

[0052] For each general-purpose pipe section 62 advanced, the perforated segment 71 is opened, and after the anchor bolts 72 are installed, the perforated segment 71 is sealed with a flange to prevent groundwater from entering the pipeline through the perforated segment 71. A new general-purpose pipe section 62 is installed behind the previous one, with water-stop tape wrapped around the joints between sections; this process is repeated until the tunnel boring machine 6 and the first pipe section 61 are pushed out to the receiving shaft.

[0053] The construction of water supply pipe jacking and sewage pipe jacking is carried out in the jacking working shaft 1, respectively, following the jacking pipe 6 construction steps described above. In some embodiments, after the pipe sections are jacked, the sealing performance between the pipe sections needs to be tested, and the jacking work of pipe 6 is only completed after the test is passed.

[0054] In some embodiments, a laser emitting device and a laser receiving device are installed inside the jacking shaft 1, and a laser reflecting device is installed on the first pipe section 61 or the support 73. During the jacking of the pipe 6, the laser reflecting device is installed on the first pipe section 61; during the installation of the support 73, the laser reflecting device is installed on the support 73. The laser path is designed according to the design axis of the construction pipeline. The laser emitted from the laser emitting device is reflected by the laser reflecting device and enters the laser receiving device, thereby determining whether the jacking pipe 6 or the support 73 is installed correctly. When the light from the laser reflecting device to the laser receiving device exceeds a certain normal range, it indicates that deflection has occurred. Using a laser for positioning ensures that the jacking pipe 6 is not deviated when jacking along the slope, and can also be used to prevent deviation during the subsequent installation of the water supply pipe 3 and sewage pipe 5 along the slope. When used for positioning the support 73, if the pipe support 73 or the pipe is not straight or is tilted, the position and elevation of the pipe support 73 or the pipe should be adjusted immediately.

[0055] In step S4, the support 73 is a steel support 73. Since the jacking length of the large-diameter pipe 6 is relatively large in a single jacking operation, to facilitate pipe installation, elevation control, and pipe positioning, in this embodiment, one steel support 73 is installed every 6 meters. The steel support 73 is fabricated by welding inside the jacking pipe 6 on-site, and its height is determined according to the elevation of the jacking pipe 6. In some embodiments, the steel support 73 can be raised and lowered. It is lowered when placing the water supply pipe 3 and raised during installation to adjust the pipe's elevation. Raising and lowering is achieved using a hand-cranked lifting mechanism or a jack. The construction of the steel support 73 is carried out manually.

[0056] Multiple pipes are fixed to the support 73 using pipe clamps. During construction, the pipes to be installed are placed on the support 73, with some pipe joints located in the middle of the support 73. The pipe elevation is determined, and the pipe clamps are then fixed.

[0057] like Figure 9 As shown, cement mortar is used to fill the water supply pipe and the sewage pipe. During the filling process, to prevent cement mortar loss, a blind flange is used to seal the downstream side of the pipe, and full-section cement mortar grouting is performed from the downstream to the upstream side of the pipe. The cement mortar is made with PO42.5 cement and has a water-cement ratio of 0.8. In this invention, the downstream side of the pipe refers to the side with a lower elevation of the pipe 6, and the upstream side of the pipe refers to the side with a higher elevation of the pipe 6.

[0058] In existing technologies, pipe jacking operations disturb existing pipelines (water supply pipe 3, drainage pipe 5, power, communication, gas, power tunnels, drainage culverts) and railways 81 and highways. Reinforcement work cannot be carried out on the surface (reinforcement above would damage existing pipelines, railways 81, highways, subways, etc.). Therefore, reinforcement can only be carried out inside the pipe jacking section 6, below the existing pipelines. In this invention, the first pipe section 61 has detachable perforated segments 71 on its wall during jacking. These perforated segments 71 are pre-installed and installed. The machine can be used to install anchor bolts 72 in underground geological conditions from inside the pipeline. The anchor bolts 72 can reinforce the surrounding rock strata. The general pipe section 62 is a jacking pipe 6 with a general structure. The first pipe section 61 with a round hole segment 71 is jacked out to the receiving well. It cannot be used as a permanent pipeline. A support 73 is set inside the jacking pipe 6. In order to facilitate the control of the elevation and fix the position of the pipe, multiple pipes, including water supply pipe 3, drainage pipe 5, and reclaimed water pipe 4, are jacked into the pipeline by the pipe jacking machine 6. Then the pipe is installed and placed on the support 73. Finally, the jacking pipe 6 is filled with cement mortar.

[0059] 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 construction method for multiple pipes passing under a railway bridge via pipe jacking, characterized in that, Includes the following steps: Step S1: Construct the jacking working shaft and the receiving working shaft; the jacking working shaft is equipped with a first working chamber and a second working chamber, the first working chamber is used for jacking the water supply pipe, and the second working chamber is used for jacking the sewage pipe, and the receiving working shaft is correspondingly equipped with a first receiving chamber and a second receiving chamber; the first working chamber is also equipped with a greywater pipe, and the greywater pipe and the water supply pipe enter the first receiving chamber of the receiving working shaft in the water supply jacking pipe; Step S2: Along the designed axis of the construction pipeline, the water supply pipe jacking and the sewage pipe jacking are constructed in the jacking working shaft. The water supply pipe jacking and the sewage pipe jacking are carried out according to the pipe jacking construction steps. The constructed pipe includes a first pipe section and a general pipe section. The first pipe section has multiple perforated segments arranged circumferentially on its pipe wall. The pipe jacking construction steps include the following: Step S21: Pedal the first pipe section into the jacking working shaft, open the circular hole segment of the first pipe section wall, and install anchor bolts into the surrounding soil layer; before jacking the first pipe section, reserve working holes on the inner wall of the jacking working shaft near the receiving working shaft along the design axis of the construction pipeline, install the construction equipment first, install a rear support wall on the inner wall of the jacking working shaft away from the receiving working shaft, and install symmetrically distributed main jacking cylinders and guide rails for pipe section movement on the rear support wall, use crane equipment to place the jacking pipe to be jacked on the guide rail in front of the main jacking cylinder, install the pipe jacking machine at the front of the first pipe section, and use the main jacking cylinder to apply jacking force to the pipe section, pushing the pipe jacking machine and the first pipe section through the working hole into the soil; Step S22: Continue jacking the general pipe sections, and after each section is jacked, install anchor bolts on the first pipe section according to step S21; after jacking all the general pipe sections, the first pipe section is jacked out to the receiving working shaft; Step S3: Place brackets inside the water supply pipe and the sewage pipe. There are multiple brackets, and the multiple brackets are spaced apart along the length of the pipe. Step S4: Use a pipe jacking machine to push the water supply pipe and sewage pipe into the jacking pipe respectively, and fix the multiple pipes on the support; Step S5: Fill the water supply pipe and the sewage pipe with cement mortar.

2. The construction method for multiple pipes passing under a railway bridge via pipe jacking as described in claim 1, characterized in that, After the anchor bolts are installed, the circular hole segments are sealed with flanges.

3. The construction method for multiple pipes passing under a railway bridge via pipe jacking as described in claim 1, characterized in that, The jacking working shaft is equipped with a laser emitting device and a laser receiving device. The laser emitting device is installed on the first pipe section or the support.

4. The construction method for multiple pipes passing under a railway bridge via pipe jacking according to claim 1, characterized in that, The support frame is a steel frame.

5. The construction method for multiple pipes passing under a railway bridge jacking as described in claim 4, characterized in that, Multiple pipes are fixed to the support using pipe clamps.

6. The construction method for multiple pipes passing under a railway bridge via pipe jacking according to any one of claims 1-5, characterized in that, During the filling of cement mortar, in order to prevent the cement mortar from being lost, a blind flange is used to seal the downstream of the jacking pipe, and cement mortar grouting is carried out from the downstream of the jacking pipe to the upstream of the jacking pipe.

Images