A medium conduit for temporary drainage of urban large-flow sewage trunk lines and its construction method

Abstract

The present invention discloses a middle conduit for temporary drainage of urban large-flow sewage trunk lines, including a middle conduit centrally sleeved in an original pipeline, so that an annular channel is formed between the outer side of the middle conduit and the inner side of the original pipeline; the two ends of the middle conduit are respectively connected to the upstream inspection well and the downstream inspection well of the original pipeline; the upstream inspection well and the downstream inspection well are both provided with water-blocking plugging structures, which are used to block the two ends of the annular channel, so that the sewage in the upstream inspection well only flows to the downstream inspection well through the middle conduit; a working well is opened above the annular channel, and the working well is used for construction personnel to enter the annular channel to repair the inner wall of the original pipeline. The middle conduit is provided with a small-diameter steel pipe in the original pipeline to form a "middle conduit" to serve as a temporary drainage part. The middle conduit is constructed in a manner that water is not cut off in the original pipe, and after the construction is completed, it serves as a temporary drainage, shares the pressure of ground drainage, and avoids the occurrence of operational accidents.

Description

Technical Field

[0001] The invention relates to the field of urban pipeline repair, and in particular to a middle conduit used for temporary drainage of urban large-flow sewage trunk lines and a construction method thereof. Background Art

[0002] Repair of urban sewage main pipes requires the creation of dry storage conditions inside the main pipes, so temporary drainage needs to be set up. Most of the market adopts ground drainage, but many urban main pipes are located in the city center, such as under viaduct piles and main traffic roads. Due to traffic organization factors, large-scale temporary drainage cannot be set up on the ground, which cannot meet the large flow requirements of the main pipes, thus affecting the operation of the entire main pipe and causing operational safety accidents.

[0003] If only ground drainage is set up, due to the geographical and traffic influences mentioned above, it is impossible to set up sufficient temporary drainage, and the requirements of large-flow temporary drainage cannot be met. Moreover, once the water pump is damaged during operation, it is theoretically too late to repair it, and the large flow in a short period of time will flood the working well, causing an operation safety accident.

[0004] In order to solve the problem that there is not enough space available at main traffic arteries in the city center, ground facing rows are set up. Summary of the invention

[0005] The technical problem to be solved by the present invention is to improve the pipeline drainage capacity during the repair process of urban large-flow sewage trunk lines.

[0006] The present invention provides a middle conduit for temporary drainage of urban large-flow sewage trunk lines, comprising a middle conduit centrally sleeved in an original pipeline, so that an annular channel is formed between the outer side of the middle conduit and the inner side of the original pipeline;

[0007] The two ends of the middle conduit are respectively connected to the upstream inspection well and the downstream inspection well of the original pipeline;

[0008] Water blocking and plugging structures are provided in both the upstream inspection well and the downstream inspection well. The water blocking and plugging structures are used to block both ends of the annular channel so that the sewage in the upstream inspection well can only flow to the downstream inspection well through the middle conduit;

[0009] A working well is opened above the annular channel, and the working well is used for construction personnel to enter the annular channel to repair the inner wall of the original pipeline.

[0010] Furthermore, the middle conduit is coaxial with the original pipeline and is supported and fixed in the original pipeline by a bracket.

[0011] Furthermore, the middle conduit is formed by axially connecting a plurality of pipe fittings, and flanges for axial connection are arranged on both sides of the pipe fittings.

[0012] Furthermore, the length of the pipes is 3M, and a movable bracket is provided under each pipe.

[0013] The present invention also provides a construction method for a middle conduit for temporary drainage of a large-flow urban sewage trunk line, comprising the following steps:

[0014] Step 1: hoist the upstream pipe fittings onto a mobile bracket located in the upstream inspection well;

[0015] Step 2: Push the upstream pipe fittings into the original pipeline in sequence by moving the bracket and connect them to each other, adjust the position of the upstream pipe fittings in the original pipeline and fix the position;

[0016] Step 3, hoisting the downstream pipe fittings onto a mobile support located in the downstream inspection well;

[0017] Step 4: Push the downstream pipe fittings back into the original pipeline in sequence by moving the bracket and connect and adjust the positions of the upstream pipe fittings;

[0018] Step 5: Repeat step 4 until all pipes are connected and penetrate the original pipeline, and seal the joints of each pipe;

[0019] Step six, seal both ends of the annular channel.

[0020] Furthermore, in step one, the movable bracket includes a support seat, a vertical pole and a pulley connected in sequence from top to bottom; the circumferential curvature of the support seat and the pipe fitting are adapted, and the vertical pole can be raised and lowered.

[0021] Furthermore, in step 2, the position of the upstream pipe fitting in the original pipeline is adjusted by lifting and lowering the mobile bracket.

[0022] Furthermore, in step 2, the upstream pipe is fixed in position by connecting it with a steel rope and a fixed pile.

[0023] Furthermore, the method also includes step seven, in which a working well is opened above the original pipeline, and the working well is connected to the annular channel.

[0024] Furthermore, the method also includes step eight, setting up a ground drainage system in the upstream inspection well and the downstream inspection well.

[0025] The present invention has the following beneficial effects:

[0026] The present application discloses a medium conduit for temporary drainage of urban large-flow sewage trunk lines. A small-diameter steel pipe is set in the original pipeline to connect to form a "medium conduit" to serve as a temporary drainage part. The medium conduit is constructed by keeping the water in the original pipe. After the construction is completed, it serves as a temporary drainage, sharing the pressure of ground drainage and avoiding the occurrence of operational accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1The present invention discloses a structural schematic diagram of a middle conduit for temporary drainage of urban large-flow sewage trunk lines.

[0028] Figure 2 It is a schematic diagram of upstream pipe transportation of an upstream inspection well of the middle conduit construction embodiment disclosed in the present invention.

[0029] Figure 3 It is a schematic diagram of the position fixing structure of the upstream pipe in the middle conduit construction embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of downstream pipe transportation in the middle conduit construction embodiment of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the through connection of the middle conduit in the middle conduit construction embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and with reference to data. It should be understood that the embodiments are only for illustrating the present invention and are not intended to limit the scope of the invention in any way.

[0033] The middle conduit in the present application refers to a diversion pipe arranged in the original pipeline to be repaired for temporary drainage.

[0034] Urban large-flow sewage trunk line: refers to a line with a diameter greater than 3000mm and a maximum flow of 9m 3 / s or so trunk pipeline.

[0035] like Figure 1 As shown, the present application discloses a middle conduit for temporary drainage of urban large-flow sewage trunk lines, comprising a middle conduit 2 centrally sleeved in an original pipeline 1, so that an annular channel 11 is formed between the outer side of the middle conduit 2 and the inner side of the original pipeline 1; wherein the original pipeline refers to the original pipeline to be repaired. The diameter of the middle conduit ranges from 1200 to 1600 mm.

[0036] The two ends of the middle conduit 2 are respectively connected to the upstream inspection well 12 and the downstream inspection well 13 of the original pipeline 1;

[0037] The upstream inspection well 12 and the downstream inspection well 13 are both provided with a water blocking and plugging structure 3, which is used to block both ends of the annular channel 11, so that the sewage in the upstream inspection well 12 flows to the downstream inspection well 13 only through the middle conduit 2;

[0038] A working well 14 is opened above the annular channel 11 , and the working well 14 is used for construction workers to enter the annular channel 11 to repair the inner wall of the original pipeline 1 .

[0039] By setting up a middle duct inside the original pipeline, on the one hand, the water-carrying capacity of the original pipeline can be assumed, thereby avoiding the impact of the original pipeline repair construction on social life; on the other hand, by forming an annular dry warehouse construction space inside the original pipeline, the original pipeline can be repaired without stopping the water supply.

[0040] In this embodiment, the middle conduit 2 is coaxial with the original pipeline 1 and is supported and fixed in the original pipeline 1 by a movable bracket 21 .

[0041] In this embodiment, the middle conduit 2 is formed by axially splicing a plurality of pipes 22, flanges for axial connection are provided on both sides of the pipes 22, and a movable bracket 21 is provided under each pipe 22. In one embodiment, the length of the pipe can be adjusted according to the size of the working well, and preferably, the length of each pipe section is 2M or 3M.

[0042] The present application also discloses a construction method for a middle conduit for temporary drainage of large-flow urban sewage trunk lines, wherein preliminary preparations include: ① cooperation of the pump station to lower the water level ② ventilation of the pipeline ③ installation of lifting equipment in place ④ arrangement of mobile brackets.

[0043] The construction method includes the following steps:

[0044] Step 1: hoist the upstream pipe 221 onto a mobile bracket located in the upstream inspection well; the mobile bracket is connected with a support seat 211, a vertical rod 212 and a pulley 213 in sequence from top to bottom; the circumferential curvature of the support seat and the pipe fitting is adapted, so that the pipe fitting can be directly used to receive the pipe fitting when hoisting the pipe fitting, and the vertical rod can be raised and lowered, so that the position of the pipe fitting in the original pipeline can be adjusted, such as Figure 2 shown.

[0045] Step 2: Use a mobile bracket to push at least one section of the upstream pipe into the original pipeline, wherein pushing refers to pushing the pipe along the direction of the water flow, adjusting the position of the upstream pipe in the original pipeline and fixing the position; wherein, the position of the upstream pipe in the original pipeline is adjusted by lifting and lowering the mobile bracket, and the upstream pipe and the original pipeline are made coaxial. The upstream pipe is fixed in position by connecting a steel rope 122 to a fixed pile 121 located above the wellhead of the upstream inspection well. In this embodiment, three sections of upstream pipes are connected as positioning pipes for subsequent downstream pipe connections. Figure 3 As shown, preferably, in step 2, three upstream pipes are pushed forward into the original pipeline by moving the bracket and connected to each other. On the one hand, due to the impact of water flow, temporary dragging is difficult in forward push construction, so it is not easy to push too many pipes forward. On the other hand, the connection of multiple upstream pipes can reduce positioning errors and reduce the workload of reverse push construction.

[0046] Step 3, hoisting the downstream pipe fittings onto a mobile support located in the downstream inspection well;

[0047] Step 4: Push the downstream pipe fittings back into the original pipeline in sequence by moving the bracket and connect and adjust the position with the upstream pipe fittings; reverse pushing means pushing the pipe fittings against the direction of water flow, such as Figure 4 shown.

[0048] Step 5: Repeat step 4 until all pipes are connected and pass through the original pipeline, and seal the joints of each pipe; Figure 5 shown.

[0049] Step six, seal both ends of the annular channel.

[0050] Step seven, opening a working well above the original pipeline, and connecting the working well with the annular channel.

[0051] The advantage of setting up pipe segment positioning upstream is that due to years of corrosion, the original pipe will have material loss inside, so it is necessary to control the vertical poles and pulleys of the movable brackets of the first few sections of the pipeline to keep the middle pipe in a horizontal position.

[0052] Function of steel rope: It tightens the steel conduit to prevent it from being dispersed by water flow and no additional reinforcement measures are required.

[0053] The advantage of setting the steel rope in the upstream well and the reverse push construction of the middle conduit is that it is due to the water flow in the original pipe. Since the sewage trunk line needs to operate normally during the day, construction can only be carried out at night, and the construction of the middle conduit cannot be completed within a day's construction period, and a certain period is required. Therefore, the original pipe needs to be completely water-free during the day, and it is necessary to ensure that the middle conduit that has been welded and constructed is fixed and not washed away by the water flow. If the steel rope is set in the downstream well and pushed forward, the water flow will impact from upstream to downstream, and the steel rope will not play a tightening role. After pushing every night, the bracket needs to be reinforced, causing unnecessary labor consumption. If the steel rope is fixed in the upstream well, you only need to reverse push and dock step by step every night.

[0054] In one embodiment, the method further includes step eight, wherein a ground drainage system is provided in the upstream inspection well and the downstream inspection well, so that during the period when the water flow capacity is required to be high, the ground drainage is opened at the same time to further improve the water flow capacity.

[0055] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A construction method for a middle conduit for temporary drainage of a large-flow urban sewage trunk line, characterized in that: The steps include: Step 1: hoist the upstream pipe fittings onto a mobile bracket located in the upstream inspection well; In step 1, the mobile bracket includes a support seat, a vertical rod and a pulley connected in sequence from top to bottom; the circumferential curvature of the support seat and the pipe fitting is adapted, and the vertical rod can be raised and lowered; Step 2: Push at least one upstream pipe into the original pipeline by moving the bracket, adjust the position of the upstream pipe in the original pipeline and fix the position; In step 2, the position of the upstream pipe fitting in the original pipeline is adjusted by lifting and lowering the mobile bracket, and the upstream pipe fitting and the original pipeline are made coaxial; Step 3, hoisting the downstream pipe fittings onto a mobile support located in the downstream inspection well; Step 4: Push the downstream pipe fittings back into the original pipeline in sequence by moving the bracket and connect and adjust the positions of the upstream pipe fittings; Step 5: Repeat step 4 until all pipes are connected and penetrate the original pipeline, and seal the joints of each pipe; Step 6, blocking both ends of the annular channel; The middle conduit for temporary drainage of urban large-flow sewage trunk lines comprises a middle conduit centrally sleeved in an original pipeline, so that an annular channel is formed between the outer side of the middle conduit and the inner side of the original pipeline; The two ends of the middle conduit are respectively connected to the upstream inspection well and the downstream inspection well of the original pipeline; The upstream inspection well and the downstream inspection well are both provided with a water blocking and plugging structure, and the water blocking and plugging structure is used to block the two ends of the annular channel, so that the sewage in the upstream inspection well only flows to the downstream inspection well through the middle conduit; A working well is provided above the annular channel, and the working well is used for construction personnel to enter the annular channel to repair the inner wall of the original pipeline; The middle conduit is formed by axially connecting a plurality of pipe fittings, and flanges for axial connection are arranged on both sides of the pipe fittings; A movable bracket is provided under each pipe fitting; The middle conduit is coaxial with the original pipeline and is supported and fixed in the original pipeline by a bracket.

2. The construction method according to claim 1, characterized in that: In step 2, the three upstream pipes are pushed into the original pipeline by moving the bracket and connected to each other.

3. The construction method according to claim 1, characterized in that: In step 2, the upstream pipe is fixed in position by connecting it to a fixed pile via a steel rope.

4. The construction method according to claim 1, characterized in that: The method further comprises step seven, of opening a working well above the original pipeline, wherein the working well is connected to the annular channel.

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