Construction method for pipe jacking into existing drainage system

Abstract

The application discloses a construction method of pipe jacking access to an old drainage system, and relates to the technical field of pipe jacking construction, which comprises the following steps: S1, blocking the original channel in the old well; S2, pumping water and dredging silt in the old well, and ventilating; S3, starting from the construction of the pipe jacking machine in the original well to stopping at the old well wall; S4, chiseling the well wall, and the chiseling position is the part between the well wall and the pipe jacking machine; S5, blocking the gap between the pipe jacking machine shell and the well wall; S6, removing the equipment in the pipe jacking machine, retaining the shell, and transporting from the back of the pipeline; and S7, removing the blocking of the original channel. The application is helpful to reduce the influence on traffic and is suitable for the reconstruction operation of the old well in the complex traffic environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipe jacking construction technology, in particular to a construction method for connecting a pipe jacking to an existing drainage system. BACKGROUND

[0002] Pipe jacking construction technology mainly originated in Japan and European and American countries, and is widely used in urban underground passages and underpass construction structures due to its high construction efficiency, small construction disturbance, and small land occupation space.

[0003] Current pipe jacking construction is usually performed by using a pipe jacking machine from a starting well to a receiving well, and after the starting well and the receiving well are connected, the pipe jacking machine is removed. However, when some existing drainage systems are to be reconstructed, i.e., when a pipe jacking is connected to an old rainwater and sewage well, the old rainwater and sewage well needs to be surrounded and traffic needs to be interrupted in the last stage, and the pipe jacking machine is removed and hoisted out by using a truck crane.

[0004] This method has little impact on the actual traffic conditions in some road sections with good traffic conditions, but when the old rainwater and sewage well is at an intersection with a complex traffic environment, it is necessary to reduce the impact of construction on traffic conditions as much as possible. The existing construction method needs to reconstruct the roof of the old rainwater and sewage well, expand the hoisting opening, and then hoist the pipe jacking machine out by using a truck crane. The reconstruction construction period is long, and the impact on traffic is large, i.e., the existing construction method still needs to be improved. SUMMARY

[0005] In order to reduce the impact on traffic, the present application provides a construction method for connecting a pipe jacking to an existing drainage system.

[0006] The construction method for connecting a pipe jacking to an existing drainage system provided by the present application adopts the following technical solution:

[0007] A construction method for connecting a pipe jacking to an existing drainage system, the steps of which are as follows:

[0008] S1: block the original channel in the old well;

[0009] S2: pump water and dredge the old well, and ventilate and exchange air;

[0010] S3: the pipe jacking machine is constructed from the starting well to the old well wall and stopped;

[0011] S4: the well wall is chiseled off, and the chiseled-off position is the part between the well wall and the pipe jacking machine;

[0012] S5: block the gap between the pipe jacking machine shell and the well wall;

[0013] S6: remove the equipment in the pipe jacking machine, retain the shell, and transport it out from the back of the pipe;

[0014] S7: Remove the blockage of the original channel.

[0015] By adopting the above technical solution, the original passage in the old well is first blocked, and then the well is pumped out and silted, and ventilated to avoid the presence of harmful gases that affect the health of construction workers. Then the pipe jacking machine starts to excavate from the starting well in the direction of the old well until the construction stops at the old well wall. Then the construction workers go down the well and use mechanical equipment to chisel the well wall to connect the old well with the pipe jacking machine. Then the part between the pipe jacking machine casing and the chiseled part of the well wall is blocked, and then the equipment in the pipe jacking machine is removed, retaining the casing, and the equipment is transported out from the rear of the pipeline and hoisted out at the starting well. There is no need to hoist it at the old well, that is, there is no need to modify the roof of the old well, which helps to reduce the impact on traffic conditions. Finally, the blockage of the original passage is removed to achieve the connection between the pipe jacking and the old well.

[0016] Preferably, in step S1, a diver dives into the well and performs brick wall construction on the entrance of the original passage.

[0017] By adopting the above technical solution, in order to create a dry working environment, divers are required to dive into the well and seal the entrance of the original channel. The divers use brick walls to seal the original channel. During this process, the divers change shifts every two hours until the original channel is completely sealed.

[0018] Preferably, in step S2, a mud pump is used to extract sewage from the well, and then a high-pressure water truck is used to pump water into the well to dilute the sludge. Finally, a sewage suction truck is used to suck out the sludge, and then a blower is used to ventilate the well.

[0019] By adopting the above technical solution, a dry working environment is created. First, a mud pump is needed to drain the sewage in the well. At this time, the bottom of the well is full of silt and cannot be directly pumped away. At this time, a high-pressure water truck is used to fill water into the well, and then stirred to dilute the silt. The silt is then sucked out by a sewage suction truck. At this time, due to long-term sewage pollution in the well, harmful gases will remain at the bottom of the well. Therefore, a blower is used to ventilate the well and purify the air in the well, which helps to reduce the harm to construction workers when working in the well.

[0020] Preferably, in step S3, the pipe jacking machine is constructed to the retaining piles around the old well, and stops after being pushed into the retaining piles.

[0021] By adopting the above technical solution, the pipe jacking machine is constructed from the starting well all the way to the old well. There will be retaining piles around the old well, which are very strong and the pipe jacking machine cannot continue to move forward. In practice, the pipe jacking machine stops working after extending 15 cm into the retaining piles. Then the construction personnel go down the well to chisel out the part between the old well wall and the pipe jacking machine and manually open the pipeline.

[0022] Preferably, in the step S5, a ring-shaped steel plate is prefabricated, the ring-shaped steel plate is welded and fixed to the machine shell of the pipe jacking machine, and the ring-shaped steel plate is riveted to the well wall; the ring-shaped steel plate is provided with a grouting opening, and grouting is performed from the grouting opening.

[0023] By adopting the above technical scheme, when the well wall is removed to communicate the well with the pipe jacking machine, the prefabricated ring-shaped steel plate is hoisted into the well and welded and fixed to the machine shell of the pipe jacking machine, and the ring-shaped steel plate is riveted to the well wall by rivets, and the ring-shaped steel plate is provided with a grouting opening, and grouting is performed from the grouting opening to fill the removed gap, which helps to improve the structural strength of the newly-built pipe opening.

[0024] Preferably, in the step S6, the cutter head and related hydraulic drive components of the pipe jacking machine are removed, and the cutter head and related components are transported to the starting well by using a transport trolley and hoisted to the ground.

[0025] By adopting the above technical scheme, the related equipment in the pipe jacking machine is removed, and the machine shell is retained, and then the related equipment is transported to the starting well from the rear by using a trolley, that is, the pipe jacking machine related equipment does not need to be hoisted out of the old well, and thus the ground at the old well does not need to be constructed and modified, thereby reducing the influence on the road traffic at the old well.

[0026] Preferably, in the step S7, a concrete lining is constructed in the machine shell, and then the original passage is removed.

[0027] By adopting the above technical scheme, the inner diameter of the machine shell is larger than that of the pipe jacking machine, and thus there is a gap between the two, and the concrete lining is constructed in the machine shell to make the inner sides of the two in the same plane, so as to keep the water flow unobstructed and prevent water from seeping into the soil from the gap. In addition, the concrete lining is on the inner side of the machine shell and the ring-shaped steel plate, which helps to improve the corrosion resistance of the machine shell and the ring-shaped steel plate.

[0028] Preferably, a plurality of tie rods are first fixed to the inner side of the ring-shaped steel plate, then a ring-shaped reinforcement mesh is tied, then a wooden form is erected, and finally concrete is poured between the wooden form and the ring-shaped steel plate, and after curing, the inner form is removed.

[0029] By adopting the above technical scheme, a plurality of tie rods are first fixed to the inner side of the ring-shaped steel plate, then a ring-shaped reinforcement mesh is tied, the ring-shaped reinforcement mesh is laid in the ring-shaped steel plate and fixed by welding with the tie rods to realize the pre-embedding of the ring-shaped reinforcement mesh, then a plurality of wooden forms are supported in a circumferential manner on the inner side of the ring-shaped reinforcement mesh by inner supports, then concrete is poured inside to form a concrete lining, and after curing, the wooden forms are removed.

[0030] In summary, the present application has at least one of the following beneficial technical effects:

[0031] 1. When the pipe jacking machine construction is completed, the equipment in the pipe jacking machine is transported from the rear of the pipe to the starting well, and then hoisted out, without the need for modification and hoisting operation at the old well, which helps to reduce the impact on the old well road traffic;

[0032] 2. The machine shell is reserved, and the concrete lining is poured on the inner wall of the machine shell, which helps to prevent water from penetrating into the soil from the gap between the machine shell and the pipe jacking machine, and helps to improve the corrosion resistance of the machine shell and the annular steel plate;

[0033] 3. After the annular steel plate is fixed, grouting is performed from the reserved grouting port to the gap between the machine shell and the well wall, which helps to improve the structural strength of the new pipe port. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A flowchart of a pipe jacking access to an existing drainage system construction method according to an embodiment of the present application;

[0035] Figure 2 A schematic diagram of blocking the original passage in an embodiment of the present application;

[0036] Figure 3 A cross-sectional schematic diagram after grouting into the annular steel plate in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of pouring a concrete lining in an embodiment of the present application.

[0038] Reference signs: 1, old well; 2, original passage; 3, pipe jacking machine; 4, machine shell; 5, annular steel plate; 6, grouting port; 7, pull rod; 8, annular steel mesh; 9, wooden mold; 10, concrete lining. DETAILED DESCRIPTION

[0039] The following will be described in detail with reference to the accompanying drawings Figures 1-4 The present application will be further described in detail.

[0040] An embodiment of the present application discloses a pipe jacking access to an existing drainage system construction method.

[0041] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , the pipe jacking access to an existing drainage system construction method steps are as follows:

[0042] S1: Block the original passage 2 in the old well 1.

[0043] Specifically, there is sewage sludge in the old well 1, and a dry operation environment needs to be created during actual construction, so a diver needs to dive into the water to block the original passage 2 with a brick wall, and the diver needs to be replaced every two hours.

[0044] S2: Pump out water and desilt the old well 1, and ventilate it.

[0045] Specifically, after the original channel 2 is sealed, the sewage in the well is first pumped out using a mud pump. At this time, all that remains at the bottom of the well is silt. A high-pressure water truck is used to pump water into the well and stir it to dilute the silt. The silt is then sucked out cleanly using a sewage suction truck. At this time, the construction workers are still unable to go down the well to work, because sewage has been stored in the well for a long time, and harmful gases will exist at the bottom of the well, affecting the health of the construction workers. After the silt is sucked out, a blower is used to ventilate the well and replace and purify the air in the well, which helps to reduce the harm of the well environment to the construction workers.

[0046] S3: The pipe jacking machine 3 starts from the starting well and stops at the wall of the old well 1.

[0047] Specifically, the pipe jacking machine 3 was working from the starting well toward the old well 1. Since the old well 1 was surrounded by retaining piles with high hardness, when the pipe jacking machine 3 extended into the retaining piles by 15 cm, the pipe jacking machine 3 could not move forward and stopped working.

[0048] S4: Chiseling away the well wall, wherein the chiseling away position is the portion between the well wall and the pipe jacking machine 3 .

[0049] Specifically, when the pipe jacking operation stops, there is still a certain distance between the pipe jacking machine 3 and the inner wall of the old well 1. Construction personnel need to use mechanical equipment to manually perform chiseling operations to drill through the well wall and the pipe jacking machine 3. Before performing the well wall chiseling operation, a reinforced freezing structure needs to be constructed at the planned tunnel portal. It is set on the outside of the planned excavated soil from the tunnel portal to the machine casing 4, serving as a support structure during the excavation of this section of soil, to improve the structural strength of the surrounding side, and then the well wall chiseling operation is performed to open up the connection between the machine casing 4 and the old well 1.

[0050] S5: Seal the gap between the casing 4 of the pipe jacking machine 3 and the well wall.

[0051] Specifically, when the well wall is being chiseled, its shape is difficult to control. At this time, it is necessary to seal the gap between the casing 4 and the well wall to improve the structural strength of the hole. The prefabricated annular steel plate 5 is hoisted to the bottom of the well, and then the edge of the annular steel plate 5 is docked with the shell of the casing 4 and welded to fix it. Thereafter, the annular steel plate 5 is riveted to the well wall with rivets. A plurality of grouting ports 6 are reserved on the annular steel plate 5. After the annular steel plate 5 is fixed, grouting is injected inward from the grouting ports 6 to fill the gap therein and make it dense, which helps to improve the structural strength of the hole.

[0052] S6: Remove the equipment inside the pipe jacking machine 3, keep the casing 4, and transport it out from the rear of the pipeline.

[0053] Specifically, the cutter head and related hydraulic equipment in the pipe jacking machine 3 are removed, and transported to the starting well by a trolley in the pipeline, and lifted out by a car crane. There is no need to lift them from the old well 1, that is, there is no need to modify the top plate of the old well 1. If it needs to be lifted out from the old well 1, the modification period of the top plate of the old well 1 is long, and the impact on traffic is greater. Therefore, transporting it to the starting well does not require modification of the old well 1, which helps to reduce the impact on traffic.

[0054] S7: Remove the blockage of the original channel 2.

[0055] Specifically, a plurality of tie rods 7 are first fixed on the inner side of the annular steel plate 5, and then the annular steel mesh 8 is tied, the annular steel mesh 8 is laid inside the annular steel plate 5, and welded and fixed to the tie rods 7, and then a plurality of wooden molds 9 are supported in a circular shape, located on the inner side of the annular steel mesh 8, and supported by internal supports, and then concrete is poured to form a concrete lining 10. After the concrete curing is completed, the wooden molds 9 are removed, and finally the blockage on the original channel 2 is removed to realize the connection of the jacking pipe with the old well 1.

[0056] The implementation principle of a construction method for connecting a jacking pipe to an old drainage system in an embodiment of the present application is as follows: first, a dry working construction environment is created for the old well 1, and the opening of the original channel 2 is blocked. Then, when the jacking machine 3 is constructed to the well wall, the construction personnel go down into the well and chisel the wall to connect the old well 1 with the jacking machine 3. Then, with the assistance of the annular steel plate 5, the gap between the casing 4 and the well wall is filled. After that, the equipment in the jacking machine 3 is removed, and the casing 4 is retained. The relevant equipment is transported to the starting well by a trolley and then hoisted to the ground. Then, a concrete lining 10 is constructed to prevent corrosion of the annular steel plate 5 and the casing 4. It is best to remove the blockage of the original channel 2 to achieve the connection between the jacking pipe and the old well 1. This method does not require the modification of the top plate of the old well 1, which helps to reduce the impact on traffic.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A construction method for pipe jacking into an existing drainage system, the steps of which are as follows: S1: Blocking the original channel (2) in the old well (1); S2: Pumping out water, clearing silt and ventilating the old well (1); S3: The pipe jacking machine (3) starts from the starting well and stops at the wall of the old well (1); S4: Chiseling away the well wall, where the chiseling away position is the portion between the well wall and the pipe jacking machine (3); S5: sealing the gap between the casing (4) of the pipe jacking machine (3) and the well wall; S6: Remove the equipment inside the pipe jacking machine (3), keep the casing (4), and transport it out from the rear of the pipeline; S7: removing the blockage of the original channel (2); In step S3, the pipe jacking machine (3) is constructed to the retaining piles around the old well (1), and stops after it is pushed into the retaining piles; In step S5, a ring-shaped steel plate (5) is prefabricated, the ring-shaped steel plate (5) is welded and fixed to the casing (4) of the pipe jacking machine (3), and the ring-shaped steel plate (5) is riveted to the well wall; a grouting port (6) is reserved on the ring-shaped steel plate (5), and grouting is performed from the grouting port (6); In step S7, a concrete lining (10) is first constructed inside the casing (4), and then the original channel (2) is removed and sealed; a plurality of tie rods (7) are first fixed on the inner side of the annular steel plate (5), and then the annular steel mesh (8) is tied, and then a wooden formwork (9) is set up, and finally concrete is poured between the wooden formwork (9) and the annular steel plate (5). After curing is completed, the wooden formwork (9) is removed.

2. The construction method of pipe jacking into an old drainage system according to claim 1, characterized in that: In step S1, a diver dives into the well and constructs a brick wall at the entrance of the original channel (2).

3. The construction method of pipe jacking into an old drainage system according to claim 1, characterized in that: In step S2, a mud pump is used to extract sewage from the well, and then a high-pressure water truck is used to pump water into the well to dilute the sludge. Finally, a sewage suction truck is used to suck out the sludge, and then a blower is used to ventilate the well.

4. The construction method of pipe jacking into an old drainage system according to claim 1, characterized in that: In step S6, the cutter head and related hydraulic drive components of the pipe jacking machine (3) are removed, and the cutter head and related components are transported to the starting well using a transport trolley and hoisted to the ground.

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