CN111236387B - Construction method for connecting newly-built sewage pipe with existing sewage pipe - Google Patents
Construction method for connecting newly-built sewage pipe with existing sewage pipe Download PDFInfo
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- CN111236387B CN111236387B CN202010053573.6A CN202010053573A CN111236387B CN 111236387 B CN111236387 B CN 111236387B CN 202010053573 A CN202010053573 A CN 202010053573A CN 111236387 B CN111236387 B CN 111236387B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0401—Gullies for use in roads or pavements
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Abstract
The invention discloses a construction method for connecting a newly-built sewage pipe with an existing sewage pipe, which comprises the steps of newly-built connecting transition well, strengthening soil bodies among wells, transversely tunneling a steel pipe sleeve, designing pipeline construction and communicating construction of the existing sewage well and the connecting transition well. According to the invention, the connection transition well is newly built outside the existing sewage well, the newly built sewage pipe is communicated with the connection transition well, and the through connection transition well and the existing sewage well are transversely tunneled by the ultra-short distance pipe jacking construction method, so that the existing sewage pipe and the newly built sewage pipe are successfully connected, and the method has the advantages of simplicity in operation, strong practicability, high construction efficiency and low safety risk.
Description
Technical Field
The invention relates to municipal pipeline construction, in particular to a construction method for connecting a newly-built sewage pipe with an existing sewage pipe.
Background
In the municipal pipeline construction process, newly-built sewage pipeline often need communicate with existing sewage pipeline through the construction of plugging into, and pipeline plugging all the time is the major difficulty of municipal pipeline construction. Particularly, in the connection construction between the main sewage pipe and the secondary sewage pipe, because of the characteristics of complex operation environment, deep pipeline embedment, large sewage flow, high flow speed and the like in the existing main sewage pipe, great difficulty and quality safety risk are brought to the pipeline connection construction. The general sewage pipeline connection construction has two processes: firstly, an existing sewage well 1 of an existing sewage pipe 2 is used as a target well to be plugged, an air bag 31 is used for plugging the upstream and downstream of the target well underwater, the plugging of the target well to be plugged is realized in a continuous drainage adjusting mode (shown by an arrow in fig. 1) in the process, a dry operation environment is formed, and a newly-built sewage pipeline 4 is directly connected to the target well, as shown in fig. 1; secondly, a horse riding well 32 is newly built on the existing sewage pipe 2 to serve as a target well, the newly built sewage pipe 4 is connected in a pipe jacking or open cut mode, and finally the existing sewage pipe 2 is broken underwater to complete connection construction, as shown in fig. 2.
The two connection processes are more used in the municipal pipeline construction process, but have self limitations, wherein the first connection process is as follows: 1) the amount of sewage adjusting and discharging engineering is large, and one-time investment for purchasing a water pump, an adjusting and discharging pipeline and the like is large; 2) in a construction site such as an urban area, sewage adjusting and draining work is inconvenient to carry out, if the specification and model of the water adjusting and draining pump are not matched with the flow of a municipal pipeline, flooding is easy to cause, and public opinion risks are high; 3) the temporary plugging is generally performed by air bag underwater plugging, the height difference of water levels of upstream and downstream of a target well is large after plugging, the air bag has a bursting risk, and the safety of operating personnel in the well cannot be guaranteed. The second connection process comprises the following steps: 1) the position of the existing sewage pipeline cannot be accurately positioned, and the position of the horse riding well is not well mastered; 2) the newly-built horse riding well has to contain a part of the existing pipeline, and simultaneously ensures that the newly-built pipeline has enough working space, so that the size of the horse riding well is relatively large, and the construction period and the cost are both large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method for connecting a newly-built sewage pipe and an existing sewage pipe, which is simple to operate, high in practicability, high in construction efficiency and low in safety risk.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction method for connecting a newly-built sewage pipe with an existing sewage pipe comprises the following steps:
s1, newly building a connecting transition well: a connecting transition well is newly built outside the existing sewage well, the connecting transition well is separated from the existing sewage well by a certain distance, a door opening is reserved on the wall surface of the connecting transition well facing the existing sewage well, and a newly-built sewage pipe is connected into the connecting transition well;
s2, strengthening soil among wells: grouting and reinforcing soil bodies between the connection transition well and the existing sewage well;
s3, transversely tunneling the steel pipe sleeve: inserting a steel sleeve with a grouting hole into a reserved door opening, transversely tunneling from a connection transition well to the existing sewer well, enabling the steel sleeve to penetrate through the inter-well soil body and extend into the outer wall of the existing sewer well, perforating the outer wall of the existing sewer well in the steel sleeve, and continuing to chisel along the drilled hole until the inner-layer steel bars on the wall surface of the existing sewer well are exposed;
s4, designing a pipeline for construction: penetrating the design pipeline through the steel sleeve to the face surface in the opened hole, grouting a gap between the steel sleeve and the design pipeline by using a grouting hole to form a first water stopping layer, wherein the existing sewage well is not communicated with the design pipeline, so that two ends of the design pipeline extend out of the steel sleeve, and constructing a water stopping ring beam at the end part of the design pipeline at the end of the connection transition well;
s5, performing through construction of the existing sewage well and the connection transition well: and the tunnel face is provided with small through holes, the cross section area of each small through hole is smaller than that of the designed pipeline, so that sewage in the existing sewage well flows into the connection transition well, and the tunnel face butted with the designed pipeline is completely chiseled when the water level height of the connection transition well is the same as that of the existing sewage well, so that the whole pipe orifice of the designed pipeline is communicated with the existing sewage well, and connection is completed.
As a further improvement of the above technical solution:
in the step S3, before the outer wall of the existing sewage well is perforated in the steel casing, a gap between the door opening and the steel casing is grouted to form a second water stop layer.
And in the step S3, excavating along with the roof in the steel sleeve in a manual mode, performing transverse tunneling, drilling the outer wall of the existing sewage well in the steel sleeve in a manual mode, and continuing to drill until the inner-layer steel bars on the wall surface of the existing sewage well are exposed.
In the step S3, the steel sleeve extends into the outer wall of the existing sewage well by 5-15 cm.
In the step S3, when the outer wall of the existing sewage well is perforated in the steel casing, the aperture of the perforated hole is larger than the outer diameter of the designed pipeline, and the difference between the two is 5cm to 15 cm.
In step S4, the designed pipe is pushed from the steel casing to the face with the assistance of a hydraulic jack.
In the step S5, a diver is arranged to open a small through hole on the face of the transition well to be plugged, and when the height of the water level of the transition well to be plugged is the same as that of the existing sewer well, the diver completely chisels the face of the transition well to be plugged, which is butted with the designed pipeline.
In step S5, the diver removes the remaining concrete on the tunnel face and then takes out the concrete.
In the step S1, before the connecting transition well (5) is newly built, excavating the earthwork on the top of the existing sewage well (1), removing the waterproof layer and the cover plate of the existing sewage well (1), and bricking protection around the well of the existing sewage well (1); in the step S5, before the small through holes are formed in the tunnel face, the earthwork of the top of the existing sewage well (1), the waterproof layer and the cover plate are restored, then the cover plate of the transition well is connected, the waterproof layer of the top of the well is poured, and the shaft is built.
In the step S1, the newly-built connecting transition well is constructed by using an open caisson or a reverse method.
Compared with the prior art, the invention has the advantages that:
according to the construction method for connecting the newly-built sewage pipe and the existing sewage pipe, a connecting transition well is newly built outside the existing sewage well, the newly-built sewage pipe is communicated with the connecting transition well, and the through connecting transition well and the existing sewage well are transversely tunneled through an ultra-short distance pipe jacking construction method, so that the existing sewage pipe and the newly-built sewage pipe are successfully connected. The soil body between the connection transition well and the existing sewage well is reinforced, the problems of water gushing, sand gushing, soil body collapse and the like caused by the fact that the soil body is in a flow plastic shape due to the fact that the underground water level is high during transverse tunneling are effectively solved, the construction efficiency is improved, the connection transition well ultra-short-range pipe-jacking connection construction technical scheme is simple to operate and strong in practicability, the construction efficiency is improved, safety risks are reduced, a grouting process is adopted, the problems of repeated plugging, arrangement adjustment and the like are effectively overcome during transverse tunneling from the connection transition well to the existing sewage well, and the construction period, safety and quality are better guaranteed. The connection method is a connection process which is simple to operate, strong in practicability and good in economic and social benefits.
Drawings
Fig. 1 is a schematic view of a connection construction method of a newly-built sewage pipe and an existing sewage pipe in the prior art.
Fig. 2 is a schematic view of another connection construction method of a newly-built sewage pipe and an existing sewage pipe in the prior art.
Fig. 3 is a schematic top view of the structure of the construction method for connecting the newly-built sewer pipe and the existing sewer pipe.
Fig. 4 is a schematic construction process diagram of a newly-built connecting transition well in the invention.
FIG. 5 is a schematic view showing a construction process of the transverse driving of the steel pipe casing according to the present invention.
Fig. 6 is a schematic view of the construction process of the present invention (excluding the water stop ring beam) for designing pipe construction.
Fig. 7 is a schematic view of the construction process (including the water stop ring beam) for designing the pipeline construction in the present invention.
FIG. 8 is a schematic perspective view of a steel pipe casing according to the present invention.
FIG. 9 is a schematic sectional view of a steel pipe casing according to the present invention.
Fig. 10 is a flow chart of the construction method for connecting the newly-built sewage pipe with the existing sewage pipe.
The reference numerals in the figures denote:
1. an existing bilge well; 2. the existing sewage pipe; 31. an air bag; 32. a horse riding well; 33. a hydraulic jack; 4. newly building a sewage pipe; 5. connecting a transition well; 51. a door opening; 6. interwell soil mass; 7. steel casing; 71. grouting holes; 8. designing a pipeline; 81. a water stop ring beam; 91. a first water stop layer; 92. and a second water stopping layer.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
As shown in fig. 3 to 10, the method for connecting a newly-built sewer pipe with an existing sewer pipe according to this embodiment includes the following steps:
s1, newly building a connecting transition well: newly building a connection transition well 5 outside the existing sewage well 1, wherein the connection transition well 5 is separated from the existing sewage well 1 by a certain distance, reserving a door opening 51 on the wall surface of the connection transition well 5 facing the existing sewage well 1, and connecting a newly-built sewage pipe 4 into the connection transition well 5;
s2, strengthening soil among wells: grouting and reinforcing the soil body 6 between the connecting transition well 5 and the existing sewage well 1;
s3, transversely tunneling the steel pipe sleeve: inserting a steel sleeve 7 with a grouting hole 71 into a reserved door opening 51, performing transverse tunneling from a connection transition well 5 to the direction of an existing sewer well 1, enabling the steel sleeve 7 to penetrate through an interwell soil body 6 and extend into the outer wall of the existing sewer well 1, drilling the outer wall of the existing sewer well 1 in the steel sleeve 7, and continuing drilling along the drilled hole until inner-layer steel bars on the wall surface of the existing sewer well 1 are exposed, wherein the step is an ultra-short-range pipe-jacking construction method;
s4, designing a pipeline for construction: penetrating the designed pipeline 8 through the steel sleeve 7 to the face surface in the opened hole, grouting the gap between the steel sleeve 7 and the designed pipeline 8 by using the grouting hole 71 of the steel sleeve 7 to form a first water stop layer 91, wherein the existing sewage well 1 is not communicated with the designed pipeline 8, so that two ends of the designed pipeline 8 extend out of the steel sleeve 7, and constructing a water stop ring beam 81 at the end part of the designed pipeline 8 at the end part of the connection transition well 5;
s5, performing through construction of the existing sewage well and the connection transition well: and (3) a through small hole is formed in the face (namely, the working face for digging propulsion), the sectional area of the through small hole is smaller than that of the designed pipeline 8, so that sewage in the existing sewage well 1 flows into the connection transition well 5, and when the water level height of the connection transition well 5 is the same as that of the existing sewage well 1, the face butted with the designed pipeline 8 is completely chiseled, so that the whole pipe orifice of the designed pipeline 8 is communicated with the existing sewage well 1, and connection is completed.
According to the connection method, a connection transition well 5 is newly built outside an existing sewage well 1, a newly built sewage pipe 4 is communicated with the connection transition well 5, and the connection transition well 5 and the existing sewage well 1 are transversely tunneled through an ultra-short distance pipe jacking construction method, so that the existing sewage pipe 2 and the newly built sewage pipe 4 are successfully connected. The soil body between the connection transition well 5 and the existing sewage well 1 is reinforced, the problems of water gushing, sand gushing, soil body collapse and the like caused by the fact that the soil body is in a flow plastic shape due to the fact that the underground water level is high during transverse tunneling are effectively solved, the construction efficiency is improved, the connection transition well 5 ultra-short-range pipe-jacking connection construction technical scheme is simple to operate and strong in practicability, the construction efficiency is improved, the safety risk is reduced, a grouting process is adopted, the transverse tunneling is conducted from the connection transition well 5 to the existing sewage well 1, the difficulties of repeated plugging, adjusting and discharging are effectively overcome, and the construction period, safety and quality are better guaranteed. The connection method is a connection process which is simple to operate, strong in practicability and good in economic and social benefits.
In this embodiment, in step S3, before the outer wall of the existing sewage well 1 is bored in the steel casing 7, the gap between the door opening 51 and the steel casing 7 is grouted to form the second water stop layer 92. Finally, two times of grouting can form a step profile, namely the first water stopping layer 91 and the second water stopping layer 92 form a step surface, so that the water stopping effect can be effectively ensured. By adopting the twice grouting process, the existing sewage well 1 is transversely tunneled from the connecting transition well 5, the difficulties of repeated plugging, adjusting and discharging and the like are effectively overcome, and the construction period, safety and quality are better ensured. The door opening 51 is formed by pre-embedding a steel lantern ring when the transition well 5 is plugged. The structure of the steel casing 7 is shown in fig. 8 and 9, and the length thereof is: the well spacing-well clear spacing-well wall thickness of the connection transition well 5 and the existing sewage well 1 is +10cm, and the inner diameter is +400mm of the outer diameter of the designed pipeline 8.
In this embodiment, in step S1, the site of the transfer well 5 should be selected in consideration of the existing pipeline condition on the site, and the transfer well 5 needs to keep a certain distance from the existing bilge well 1, so as to avoid damaging the existing bilge well 1 (also called a target well) during the construction process of the transfer well 5. And constructing the connecting transition well 5 by using an open caisson or a reverse construction method.
In this embodiment, in step S2, the inter-well soil 6 between the refute transition well 5 and the existing sewage well 1 is grouted and reinforced by the high-pressure jet grouting pile, so that the problems of water gushing, sand gushing, soil body collapse and the like caused by the fact that the soil body is in a flow plastic shape due to the high underground water level during the lateral tunneling of the steel casing 7 are effectively solved, and the construction efficiency is improved.
In this embodiment, in step S3, a manual method is adopted to dig and tunnel the steel casing 7 laterally along with the roof, a hole is opened in the steel casing 7 on the outer wall of the existing sewage well 1, the steel casing 7 extends into the outer wall of the existing sewage well 1 by 5cm to 15cm, preferably 10cm, and the hole is drilled until the inner layer steel bars on the wall surface of the existing sewage well 1 are exposed. The method has the advantages that the manual drilling is adopted, the problems that manual transverse tunneling from the transitional connection well 5 to the existing sewage well 1 is unprotected, the soil body collapses, water gushes, sand gushes and the like are effectively solved, the construction efficiency is improved, and the safety risk is reduced.
In step S3, when the outer wall of the existing sewage well 1 is perforated in the steel casing 7, the aperture of the perforated hole is larger than the outer diameter of the designed pipeline 8, the difference between the two is 5cm to 15cm, and the preferred length of the perforated hole is 10cm, so that the designed pipeline 8 can be conveniently extended into the perforated hole.
In this embodiment, in step S4, the hydraulic jack 33 is used to assist in pushing the designed pipe 8 from the steel casing 7 to the face of the rock.
In this embodiment, in step S5, a diver is arranged to cut a small through hole on the tunnel face from the connection transition well 5, and when the water level of the transition well 5 to be connected is the same as that of the existing sewer well 1, the diver cuts all the tunnel faces butted with the designed pipes 8 from the connection transition well 5. The diver removes the remaining concrete on the tunnel face and then takes out the concrete. The purpose of this step is: the phenomenon that the impact on divers is too large is avoided, if large holes are excavated at the beginning, the impact on divers caused by large water flow is large, and safety accidents are caused.
In this embodiment, in step S1, before the junction transition well 5 is newly built, the earthwork on the top of the existing sewer well 1 is excavated, the waterproof layer and the cover plate of the existing sewer well 1 are removed, and the protection is bricked around the well of the existing sewer well 1; in step S5, before the small through holes are opened on the tunnel face, the earthwork at the top of the well, the waterproof layer and the cover plate of the existing sewage well 1 are restored, and then the well cover plate of the transition well 5 is connected, the waterproof layer at the top of the well is poured, and the shaft is built.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (9)
1. A construction method for connecting a newly-built sewage pipe with an existing sewage pipe is characterized by comprising the following steps:
s1, newly building a connecting transition well: a connecting transition well (5) is newly built outside the existing sewage well (1), the connecting transition well (5) is separated from the existing sewage well (1) by a certain distance, a door opening (51) is reserved on the wall surface of the connecting transition well (5) facing the existing sewage well (1), and a newly built sewage pipe (4) is connected into the connecting transition well (5);
s2, strengthening soil among wells: grouting and reinforcing the soil body (6) between the connection transition well (5) and the existing sewage well (1);
s3, transversely tunneling the steel pipe sleeve: inserting a steel sleeve (7) with a grouting hole (71) into a reserved door opening (51), transversely tunneling from a connection transition well (5) to the direction of an existing sewer well (1), enabling the steel sleeve (7) to penetrate through an interwell soil body (6) and extend into the outer wall of the existing sewer well (1), perforating the outer wall of the existing sewer well (1) in the steel sleeve (7), and continuing to chisel along the drilled hole until inner-layer steel bars on the wall surface of the existing sewer well (1) are exposed;
s4, designing a pipeline for construction: penetrating a design pipeline (8) through a steel sleeve (7) to a tunnel face in an opened hole, grouting a gap between the steel sleeve (7) and the design pipeline (8) by utilizing a grouting hole (71) to form a first water stop layer (91), wherein the existing sewage well (1) is not communicated with the design pipeline (8), so that two ends of the design pipeline (8) extend out of the steel sleeve (7), and constructing a water stop ring beam (81) at the end part of the design pipeline (8) at the end part of a connection transition well (5);
s5, performing through construction of the existing sewage well and the connection transition well: a small through hole is formed in the face, the cross-sectional area of the small through hole is smaller than that of the designed pipeline (8), so that sewage in the existing sewage well (1) flows into the connection transition well (5), when the water level height of the transition well (5) to be connected is the same as that of the existing sewage well (1), the face butted with the designed pipeline (8) is completely chiseled, the whole pipe orifice of the designed pipeline (8) is communicated with the existing sewage well (1), and connection is completed; wherein, a diver is arranged to open a through small hole on the tunnel face from the inside of the connection transition well (5), and when the water level height of the transition well (5) to be connected is the same as that of the existing sewage well (1), the diver completely chisels the tunnel face butted with the designed pipeline (8) from the inside of the connection transition well (5).
2. The method of claim 1, wherein the step S3 is performed by grouting the gap between the steel casing (7) and the door opening (51) before the outer wall of the existing sewer manhole (1) is opened in the steel casing (7) to form the second watertight layer (92).
3. The method of claim 1, wherein in step S3, the newly-built sewer pipe is manually excavated along with the top of the steel casing pipe (7) for lateral tunneling, and the outer wall of the existing sewer well (1) is manually perforated in the steel casing pipe (7) and further chiseled until the reinforcement bars on the inner wall of the existing sewer well (1) are exposed.
4. The method for connecting a newly-built sewer pipe with an existing sewer pipe according to any one of claims 1 to 3, wherein in the step S3, the steel sleeve (7) extends into the outer wall of the existing sewer well (1) by 5-15 cm.
5. The method for connecting a newly-built sewer pipe with an existing sewer pipe according to any one of claims 1 to 3, which is characterized in that: in the step S3, when the outer wall of the existing sewage well (1) is opened in the steel sleeve (7), the aperture of the opened hole is larger than the outer diameter of the designed pipeline (8), and the difference between the two is 5 cm-15 cm.
6. The method for connecting a newly-built sewer pipe with an existing sewer pipe according to any one of claims 1 to 3, wherein in step S4, a hydraulic jack (33) is used to assist in pushing the designed pipeline (8) from the steel casing (7) to the tunnel face.
7. The method of claim 1, wherein the diver removes the remaining concrete from the tunnel face in step S5.
8. The method for connecting a newly-built sewer pipe with an existing sewer pipe according to any one of claims 1 to 3, wherein in step S1, before the new connecting transition well (5) is built, the earthwork on the top of the existing sewer well (1) is dug out, the waterproof layer and the cover plate of the existing sewer well (1) are removed, and protection is bricked around the existing sewer well (1); in the step S5, before the small through holes are formed in the tunnel face, the earthwork, the waterproof layer and the cover plate of the top of the existing sewage well (1) are restored, then the well cover plate of the connection transition well (5) is installed, the waterproof layer of the top of the connection transition well (5) is poured, and the shaft of the connection transition well (5) is built.
9. The method for connecting a newly-built sewer pipe with an existing sewer pipe according to any one of claims 1 to 3, wherein in the step S1, the newly-built connecting transition well (5) is constructed by using a sunk well or a reverse method.
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| CN111853418B (en) * | 2020-07-02 | 2022-06-03 | 深圳市市政工程总公司 | Construction method for pipeline repair |
| CN111894103A (en) * | 2020-09-08 | 2020-11-06 | 中国电建集团华东勘测设计研究院有限公司 | Pipe jacking connection guide row structure and pipe jacking connection method |
| CN114753471B (en) * | 2022-04-19 | 2023-10-03 | 五矿二十三冶建设集团有限公司 | New and old sewage pipeline water connection construction method suitable for rectangular sewage well |
| CN114908856A (en) * | 2022-06-14 | 2022-08-16 | 中交（广州）建设有限公司 | Auxiliary well structure for connecting newly-built pipeline with existing well chamber and construction method thereof |
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| KR100758675B1 (en) * | 2007-02-13 | 2007-09-13 | 주식회사 에이원콘크리트 | Concrete manhole |
| CN104763436B (en) * | 2015-03-09 | 2016-08-17 | 中国地质大学（武汉） | A kind of push-bench method of reseptance under high hydraulic pressure complex geological condition and device |
| CN107859145A (en) * | 2017-11-17 | 2018-03-30 | 广州市自来水工程公司 | A kind of drainpipe is plugged into construction method under water |
| CN108867814A (en) * | 2018-07-18 | 2018-11-23 | 中国水利水电第七工程局有限公司 | It is newly-built to cut dirty branch pipe and existing sewage network is plugged into engineering method |
| CN109183849A (en) * | 2018-08-20 | 2019-01-11 | 上海交通大学 | A kind of sea bottom steel push pipe removed obstacles based on sleeve passes through the construction method of horizon d |
| CN109208737B (en) * | 2018-10-09 | 2024-02-06 | 中铁十一局集团城市轨道工程有限公司 | Construction method for new pipe connection and original pipe plugging in large sewage pipeline relocation |
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