CN118187957A - Construction method for underwater receiving water shutoff measures of pipe pushing jack construction - Google Patents
Construction method for underwater receiving water shutoff measures of pipe pushing jack construction Download PDFInfo
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- CN118187957A CN118187957A CN202410442538.1A CN202410442538A CN118187957A CN 118187957 A CN118187957 A CN 118187957A CN 202410442538 A CN202410442538 A CN 202410442538A CN 118187957 A CN118187957 A CN 118187957A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/381—Setting apparatus or devices
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Abstract
The invention discloses a construction method for underwater receiving water shutoff measures of pipe pushing jack construction, which comprises the following steps: firstly, a pipe jacking machine shield is adopted in pipe jacking construction, the pipe jacking machine shield reaches the free surface of an underwater rock stratum, then a plugging structure is installed in a pipeline, and finally the pipe jacking machine is dismantled underwater, so that the underwater pipe jacking machine receiving construction is completed. The construction method disclosed by the invention has the advantages that the water blocking is well optimized, the risk of water gushing in a pipeline is prevented, the safety risk is greatly reduced, the construction efficiency is improved, the construction cost is reduced, and the construction safety is ensured.
Description
Technical Field
The invention relates to the technical field of water taking pump house matched construction. More particularly, the invention relates to a construction method for underwater receiving water shutoff measures of pipe pushing jack construction.
Background
The application relates to a water intake reconstruction project, which comprises related works such as a water intake head, a water intake pump room, a self-flowing water diversion pipe and the like. The gravity flow water diversion pipe mainly adopts a pipe jacking construction process, and the hardness of the area is 30-40MPa because the area is basically rock stratum, so the pipe jacking is considered to be constructed by adopting mechanical pipe jacking. The method is carried out, so that the connection between river water and a construction site in the construction process is blocked, the construction risk is reduced, and the method plays a guiding role on similar projects. After the mechanical pipe jacking construction reaches a preset position, the pipe jacking machine head needs to be dismantled under water, and river water can flow into a working well after the pipe jacking machine head is dismantled, if no water blocking measures are taken, a pipeline can flow into the river water of the Yangtze river after the shield tunneling machine, so that the inside of the originating well is communicated with the river water of the Yangtze river, flooding is caused in the originating well after the river water flows in, and dry construction cannot be formed on site. Therefore, a construction method for receiving water shutoff measures for pipe pushing jack construction underwater needs to be studied.
Disclosure of Invention
The invention aims to provide a construction method for receiving water shutoff measures of pipe jacking machine construction under water, which has the advantages that the water shutoff is well optimized, the risk of water gushing in a pipeline is prevented, the safety risk is greatly reduced, the construction efficiency is improved, the construction cost is reduced, and the construction safety is ensured.
In order to solve the technical problems, the invention provides a construction method for underwater receiving water shutoff measures of pipe pushing jack construction, which comprises the following steps: firstly, a pipe jacking machine shield is adopted in pipe jacking construction, the pipe jacking machine shield reaches the free surface of an underwater rock stratum, then a plugging structure is installed in a pipeline, and finally the pipe jacking machine is dismantled underwater, so that the underwater pipe jacking machine receiving construction is completed.
Preferably, before the pipe jacking construction, the method further comprises the following steps: firstly, segmenting an underwater pipe groove, carrying out layered blasting excavation to the position of an original designed receiving well, and then excavating a water taking head foundation groove after the groove excavation is completed; secondly, after the trench and the water intake head foundation are excavated, water intake head and underwater construction pipeline construction is started, the pipeline is carried out in a sectional construction mode and is sequentially divided into three sections, and a first section is constructed firstly; then, the third section of pipe jacking follow-up construction is carried out, the pipe jacking machine head is dismantled underwater by jacking to the empty face of the groove after the underwater blasting excavation is completed, and a plugging structure is installed in the pipe jacking pipeline for plugging after the pipe jacking machine head is out of the hole; and installing a second section of pipeline after the pipe jacking machine is dismantled underwater, and connecting the two ends of the second section of pipeline with the first section of pipeline and the pipe jacking after the installation is completed.
Preferably, the plugging structure comprises a mask and a flange plate which are mutually tightly abutted, the mask is formed by splicing an upper semicircular plate and a lower semicircular plate, the flange plate is fixed in a water taking pipeline, a plurality of outside screw caps are fixedly arranged at intervals in the circumferential direction of the outer side of the mask, a plurality of inside screw caps are correspondingly and movably arranged on the outer side of the flange plate, the mask is detachably connected with the flange plate through a plurality of screw rods, the outside screw caps and the inside screw caps, and the outer diameter of the mask is larger than the inner diameter of the flange plate and smaller than the inner diameter of the water taking pipeline.
Preferably, a blocking air bag is arranged in the water intake pipeline at a set position of the inner side interval of the mask, and the blocking air bag is used for applying certain pressure to the wall of the water intake pipeline for secondary blocking.
Preferably, the cover plate is further provided with an air inlet valve and an air outlet valve.
Preferably, the two semicircular plate contact surfaces of the mask plate are provided with inclined openings with inclined angles, and a rubber gasket is arranged between the two inclined openings which are in contact, and the inclined opening inclined angle is preferably 45 degrees.
Preferably, the plugging structure mounting method comprises the following steps: firstly, welding an outer side screw cap on the left side of a mask, welding a flange on the inner wall of a pipeline after all screw caps are welded according to the step, and starting to install a first mask; after the first mask is installed, the second mask is installed according to the step, wherein the first mask is arranged at the upper part, and the second mask is arranged at the lower part; and after the mask is installed, if the water seal is not completely blocked through observation and detection, a small amount of water seepage continuously seeps, and a blocking air bag is additionally arranged on the right side of the mask for secondary blocking.
Preferably, the plugging structure dismantling method comprises the following steps: firstly, an air inlet valve reserved at the upper part of the mask is opened, then a water outlet valve reserved on the mask is opened, water in a pipeline is discharged, then the mask is removed, and firstly the upper part and then the lower part are removed.
Preferably, after jacking of the pipe jacking is completed, before the pipe jacking machine head goes out of the hole, the following construction is carried out: two water stop plates are arranged on the pipe jacking hole wall in the working well; when the rest of the pipe jacking machine head is about 0.5-1 meter to go out of the tunnel, high-concentration cement slurry is injected into a gap between the pipeline and the tunnel at the position of the working well by using the grouting pipe, and jacking operation is performed after the cement slurry is initially set.
Preferably, the trench excavation depth is set to be more than 0.5 meter below the design elevation; meanwhile, gravels are filled in the grooves before the pipe pushing machine head leaves the holes, the filling length is not less than 6 meters, and the filling height is set to be higher than the bottom elevation of the pipe pushing machine head by more than 0.5 meter.
The invention at least comprises the following beneficial effects:
1. According to the invention, the plugging structure is arranged to realize the water plugging measure when the underwater receiving pipe jacking machine is constructed, so that a plugging construction method is formed, the water plugging is well optimized, the risk of water gushing in a pipeline is prevented, the safety risk is greatly reduced, the construction efficiency is improved, the construction cost is reduced, and the construction safety is ensured.
2. The two-stage plugging structure adopts two-stage plugging, and selects whether secondary plugging is carried out according to the actual plugging leakage condition, so that complete plugging can be realized, and smooth and safe construction is ensured; meanwhile, the plugging structure is simple in integral structure, reasonable in design, convenient to install and dismantle and high in practical value.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of trench layered excavation in accordance with the present invention;
FIG. 2 is a schematic view of a first section of piping installation of the present invention;
FIG. 3 is a schematic drawing of the pipe jacking of the present invention;
FIG. 4 is a schematic illustration of a plugging structure according to the present invention;
FIG. 5 is a side view of a plugging structure according to the present invention;
FIG. 6 is a side view of a panel structure of the present invention;
FIG. 7 is an enlarged view of a mask structure according to the present invention;
FIG. 8 is a schematic diagram of the construction of the pipe jacking machine head before the pipe jacking machine head is taken out of a tunnel;
FIG. 9 is a schematic diagram of a second section of tubing and a half hoop installation of the present invention;
fig. 10 is a schematic view of the overall construction structure of the present invention.
Reference numerals illustrate:
1. the pipe jacking system comprises a pipe jacking pipe, 2, an underwater construction pipeline, 3, an original design receiving well, 4, mould bag concrete, 5, a plugging structure, 51, a water taking pipeline, 52, a mask, 53, a flange plate, 54, a screw rod, 55, an outer side screw cap, 56, an inner side screw cap, 57, a plugging air bag, 58, an air inlet valve, 59, a water outlet valve, 6, a hoop, 7, pipe covering concrete, 8 and a water taking head.
Detailed Description
For a better understanding of the invention, its objects, structures and functions, reference should be made to the following detailed description of the invention with reference to the drawings so that those skilled in the art will be able to practice the invention.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
The construction method of the invention integrally comprises the following steps: the construction of the pipe jacking starting well is completed, the relevant preparation work of the pipe jacking 1 is completed, the pipe jacking 1 is constructed by adopting a pipe jacking machine shield, the pipe jacking machine shield is arranged on the free surface of an underwater rock stratum, a plugging structure 5 is arranged in a pipeline, then a grouting pipe and a relevant cable of the shield machine are removed, finally the pipe jacking machine is removed underwater, and the construction of the underwater receiving pipe jacking machine is completed.
As shown in fig. 1 to 10, the invention provides a construction method for underwater receiving water shutoff measures of pipe pushing jack construction, which specifically comprises the following steps:
1) And (3) excavating the underwater pipe groove in a sectional and layered blasting manner to the position of the original designed receiving well 3, and excavating the water intake head 8-base groove after the groove is excavated. The schematic is shown in fig. 1.
2) After the foundation excavation of the groove and the water intake head 8 is completed, the construction of the water intake head 8 and the underwater construction pipeline 2 is started, the pipeline is carried out in a sectional construction mode and is sequentially divided into three sections, and the first section is constructed for about 40 meters. After the pipeline is installed, reserving a working surface required by connection with a half hoop 6 of a second section of pipeline, constructing a mould bag concrete 4 underwater, pouring a first section of pipeline pipe-covering concrete 7 after the construction of the mould bag concrete 4 is completed, and starting backfilling of partial earthwork.
3) And the third section of jacking pipe 1 is constructed in a follow-up way, and is jacked to the temporary surface of the groove where the underwater blasting excavation is completed, and the head of the jacking pipe 1 is dismantled underwater by using a floating crane or a crane, as shown in fig. 3. In order to prevent river water from rushing into the working well after the head of the pipe jacking 1 is dismantled, the pipe jacking 1 is plugged by a mask 52 after the head of the pipe jacking 1 exits.
The blasting excavation section of the water diversion pipeline has the advantages that the excavation depth of the groove is required to be more than 0.5 m below the designed elevation due to the construction process requirement, so that the damage of the pipe jacking 1 or the sudden water permeability of the joint of the pipe jacking 1 caused by the suspending falling of the machine head after the machine head is out of the hole is avoided, broken stones are required to be filled in the groove before the machine head is out of the hole, the filling length is not less than 6m, and the filling height is required to be more than 0.5 m above the elevation of the bottom of the pipe jacking 1. The schematic diagram is shown in fig. 8.
The mask 52 is schematically shown in fig. 4 to 7. The plugging structure 5 comprises a mask plate 52 and a flange plate 53 which are mutually tightly abutted, the mask plate 52 is formed by splicing an upper semicircular plate and a lower semicircular plate, the flange plate 53 is fixed in a water taking pipeline 51, a plurality of outer side nuts 55 are fixedly arranged at intervals in the circumferential direction of the outer side of the mask plate 52, a plurality of inner side nuts 56 are correspondingly and movably arranged on the outer side of the flange plate 53, the mask plate 52 is detachably connected with the flange plate 53 through a plurality of screws 54 and outer side nuts and inner side nuts, and the outer diameter of the mask plate 52 is larger than the inner diameter of the flange plate 53 and smaller than the inner diameter of the water taking pipeline 51. An inlet valve 58 and an outlet valve 59 are also provided on the mask. The water intake pipeline is internally provided with a blocking air bag 57 at a set position of the inner side of the mask plate 52, and the blocking air bag is used for applying certain pressure to the wall of the water intake pipeline to carry out secondary blocking.
The mask 52 is arranged in the first pipeline and is made of a steel plate with bearing force of 0.3Mpa, and the whole mask 52 is inconvenient to install due to the fact that the operating space in the pipeline is small and the weight of the whole mask 52 is about 90KG, so that the mask 52 is spliced by two semi-circles. Meanwhile, in order to avoid the problem of leakage at the joint position after the installation is completed, the contact surface of the two masks 52 is set to be 45-degree bevel and a rubber gasket is additionally arranged, and the bevel is polished to be smooth. The inner diameter of the water conduit pipeline is 1388mm, the outer diameter 1370mm and the width 150mm of the flange plate 53, the Faraday plate is welded in the pipeline in the early stage, and reinforcing ribs are added. The outer diameter of the mask 52 is 1250mm and is 2cm from the inner edge of the flange 53.
4) Mask 52 is mounted: after the machine head is taken out of the hole, personnel enter the pipeline to remove the grouting pipe and the cable, and the mask plate 52 is installed after the removal is completed. The outside screw cap 55 is first welded to the left side of the mask 52 (a person cannot get in and out of this area during screw tightening and later removal, so that the screw cap 54 is attached to and welded to the mask 52, and the screw cap 54 cannot be screwed or removed simultaneously during the screw tightening or removal of the right side screw cap), after all screw caps are welded according to this procedure, the flange plate 53 is welded to the inner wall of the pipe, and the first mask 52 is started to be installed, and after the first mask 52 is installed, the second mask 52 is installed according to this procedure (the first mask 52 is considered to be installed at the upper part first, and the person can install in the left side area by using other auxiliary measures, and the second mask 52 is installed at the lower part, and the person or auxiliary tool cannot enter the left side area at this stage, so that the second mask 52 can only be lifted and aligned with the aid of a simple pulley or other tool on the right side). After the mask 52 is installed, if the water seal is not completely blocked, a small amount of water seepage continues to ooze, and a blocking air bag 57 can be additionally arranged on the right side of the mask 52 for secondary blocking.
5) And (3) dismantling a machine head: after the machine head is taken out of the tunnel, the machine head is bound under water by a professional diver, after the binding is completed, a connecting bolt between the machine head and a pipeline is removed, and then water is hoisted out, so that factory returning maintenance is performed.
6) And after the equipment of the pipe jacking 1 is dismantled, the second-section pipeline is installed underwater, the installation construction is performed after the manufacturing and processing of the length of the second-section pipeline are accurately measured, and the two-end underwater half hoops 6 are installed after the pipeline is checked without errors. The schematic diagram is shown in fig. 9.
7) Two pipelines are arranged in construction, the second sections of the two pipelines are all installed and completed, the rest part of pipe-covering concrete 7 is poured, and the plugging structure 5 in the pipeline of the jacking pipe 1 is detached after the pouring of the pipe-covering concrete 7 is completed. Firstly, an air inlet valve 58 is reserved at the upper part of the mask 52, then a drain valve reserved on the mask 52 is opened, water in a pipeline is discharged, then the mask 52 is removed, and firstly the upper part is removed, and then the lower part is removed. The water intake head 8 can be lifted only after the pipe end mask plate 52 is installed before installation. As shown in fig. 10.
Wherein, pipeline and tunnel gap stagnant water: the outer diameter 1420 of the jacking pipe 1, the diameter of the capillary hole of the jacking pipe 1 is about 1520 cm, so that a gap of about 5cm is formed between the pipeline and the tunnel, the slurry is injected in the jacking process, and the pressure of a part of the jacking pipe 1 to the water stop plate can be reduced due to the longer distance of the jacking pipe 1, but the slurry is diluted and precipitated secondarily after the slurry is injected into the gap between the pipeline and the tunnel, and the slurry is positioned at the middle and lower parts of the pipeline. The gap at the upper part of the pipeline still has larger pressure, and the gap is communicated with river water at the moment of the head hole outlet of the pipe jacking 1, so that huge impact force is caused to the water stop plate to damage the water stop plate, and a large amount of water is permeated in a sudden manner in a working well. The following measures are considered for this case: ① Two water stop plates are arranged on the 1-hole wall of the jacking pipe in the working well; ② And (3) accurately measuring the length of the jacking pipe 1, when the machine head leaves a hole at about 0.5-1 meter, injecting high-concentration cement slurry into a gap between the front 1-5 sections of pipelines and the tunnel at the position of a working well by using a grouting pipe, and carrying out jacking operation after the cement slurry is initially set for a certain period of time, so that the impact force of the water stop plate directly bearing water pressure is reduced. ③ One 120m 3/h water pump and two 40m 3/h water pumps are arranged for emergency use, and the generator is perfect. ④ The time for the pipe jacking 1 to go out of the tunnel should be selected in the morning, so that the special emergency treatment is facilitated.
Wherein, the water intake head 8 mask 52 is dismantled: the precondition for dismantling the water intake head 8 mask plate 52 is that the pipeline valve in the pump room is installed, the ship is anchored at the water intake head 8, and the underwater disassembly is carried out by divers. Because the water depth outside the pipeline mask 52 is about 15 meters, no water exists in the pipeline, the pressure difference exists inside and outside, the mask 52 cannot be taken down after the bolts are disassembled, and if water flow instantaneously enters the pipeline, huge impact force can be caused on valves in a pump room. Therefore, water needs to be injected into the water diversion pipeline through the overhaul pipeline at the position of the working well 1 in advance, so that the internal and external pressures of the mask plate 52 are basically consistent, and the mask plate 52 is hoisted and removed after the internal and external pressures are balanced.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. The construction method for underwater receiving the water shutoff measures of the pipe pushing jack construction is characterized by comprising the following steps: firstly, a pipe jacking machine shield is adopted in pipe jacking construction, the pipe jacking machine shield reaches the free surface of an underwater rock stratum, then a plugging structure is installed in a pipeline, and finally the pipe jacking machine is dismantled underwater, so that the underwater pipe jacking machine receiving construction is completed.
2. The construction method for receiving water shutoff measures for pipe-jacking construction under water according to claim 1, wherein the pipe-jacking construction is preceded by: firstly, segmenting an underwater pipe groove, carrying out layered blasting excavation to the position of an original designed receiving well, and then excavating a water taking head foundation groove after the groove excavation is completed; secondly, after the trench and the water intake head foundation are excavated, water intake head and underwater construction pipeline construction is started, the pipeline is carried out in a sectional construction mode and is sequentially divided into three sections, and a first section is constructed firstly; then, the third section of pipe jacking follow-up construction is carried out, the pipe jacking machine head is dismantled underwater by jacking to the empty face of the groove after the underwater blasting excavation is completed, and a plugging structure is installed in the pipe jacking pipeline for plugging after the pipe jacking machine head is out of the hole; and installing a second section of pipeline after the pipe jacking machine is dismantled underwater, and connecting the two ends of the second section of pipeline with the first section of pipeline and the pipe jacking after the installation is completed.
3. The construction method for receiving water shutoff measures of pipe pushing jack construction under water according to claim 1, wherein the plugging structure comprises a mask and a flange plate which are mutually abutted, the mask comprises an upper semicircular plate and a lower semicircular plate which are spliced, the flange plate is fixed in a water taking pipeline, a plurality of outer side nuts are fixedly arranged at intervals in the circumferential direction of the outer side of the mask, a plurality of inner side nuts are correspondingly and movably arranged on the outer side of the flange plate, the mask and the flange plate are detachably connected through a plurality of screws, the outer side nuts and the inner side nuts, and the outer diameter of the mask is larger than the inner diameter of the flange plate and smaller than the inner diameter of the water taking pipeline.
4. The construction method for underwater receiving water shutoff measures for pipe jacking construction according to claim 3, wherein a shutoff air bag is arranged in the water intake pipeline at a set position of the inner side interval of the mask, and the shutoff air bag is used for secondarily shutoff the wall of the water intake pipeline by applying a certain pressure.
5. The construction method for receiving water shutoff measures for pipe pushing jack construction under water as claimed in claim 4, wherein the cover plate is further provided with an air inlet valve and an air outlet valve.
6. The construction method for receiving water shutoff measures for pipe pushing jack construction under water according to claim 5, wherein the two semicircular plate contact surfaces of the mask plate are provided with inclined openings with an inclined angle, and a rubber gasket is arranged between the two inclined openings which are contacted, preferably, the inclined opening inclined angle is 45 degrees.
7. The construction method for receiving water shutoff measures for pipe pushing jack construction under water according to claim 6, wherein the plugging structure installation method is as follows: firstly, welding outside screw caps on the left side of a mask, welding a flange on the inner wall of a pipeline after all outside screw caps are welded according to the step, and starting the installation of a first mask; after the first mask is installed, the second mask is installed according to the step, wherein the first mask is arranged at the upper part, and the second mask is arranged at the lower part; and after the mask is installed, if the water seal is not completely blocked through observation and detection, a small amount of water seepage continuously seeps, and a blocking air bag is additionally arranged on the right side of the mask for secondary blocking.
8. The construction method for receiving water shutoff measures for pipe pushing jack construction under water according to claim 7, wherein the method for removing the shutoff structure is as follows: firstly, an air inlet valve reserved at the upper part of the mask is opened, then an outlet valve reserved at the lower part of the mask is opened, water in a pipeline is discharged, then the mask is removed, and firstly the upper part and then the lower part are removed.
9. The construction method for receiving water shutoff measures for pipe pushing jack construction under water according to claim 2, wherein after the pipe pushing jack is completed, the following construction is performed before the pipe pushing jack is lifted out: two water stop plates are arranged on the pipe jacking hole wall in the working well; when the rest of the pipe jacking machine head is about 0.5-1 meter to go out of the tunnel, high-concentration cement slurry is injected into a gap between the pipeline and the tunnel at the position of the working well by using the grouting pipe, and jacking operation is performed after the cement slurry is initially set.
10. The construction method for receiving water shutoff measures for pipe pushing jack construction under water according to claim 2, wherein the trench digging depth is set to be 0.5 meter or more below the design elevation; meanwhile, gravels are filled in the grooves before the pipe pushing machine head leaves the holes, the filling length is not less than 6 meters, and the filling height is set to be higher than the bottom elevation of the pipe pushing machine head by more than 0.5 meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410442538.1A CN118187957A (en) | 2024-04-12 | 2024-04-12 | Construction method for underwater receiving water shutoff measures of pipe pushing jack construction |
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| CN202410442538.1A CN118187957A (en) | 2024-04-12 | 2024-04-12 | Construction method for underwater receiving water shutoff measures of pipe pushing jack construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119844111A (en) * | 2025-02-07 | 2025-04-18 | 中铁隧道集团三处有限公司 | Construction method for receiving rectangular jacking pipe in immersed tube |
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- 2024-04-12 CN CN202410442538.1A patent/CN118187957A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119844111A (en) * | 2025-02-07 | 2025-04-18 | 中铁隧道集团三处有限公司 | Construction method for receiving rectangular jacking pipe in immersed tube |
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