CN112459799A - Construction method of underground water supply pipeline - Google Patents
Construction method of underground water supply pipeline Download PDFInfo
- Publication number
- CN112459799A CN112459799A CN202011320917.1A CN202011320917A CN112459799A CN 112459799 A CN112459799 A CN 112459799A CN 202011320917 A CN202011320917 A CN 202011320917A CN 112459799 A CN112459799 A CN 112459799A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- drill bit
- pipe
- pipeline body
- construction
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- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 230000008602 contraction Effects 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 25
- 239000011435 rock Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 10
- 238000012856 packing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1006—Making by using boring or cutting machines with rotary cutting tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1006—Making by using boring or cutting machines with rotary cutting tools
- E21D9/104—Cutting tool fixtures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1086—Drives or transmissions specially adapted therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
- F16L1/036—Laying or reclaiming pipes on land, e.g. above the ground in the ground the pipes being composed of sections of short length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
Abstract
The invention relates to a construction method of an underground water supply pipeline, which comprises a plurality of pipeline bodies; the pipeline compensator is discontinuously arranged among the plurality of pipeline bodies and is used for compensating expansion and contraction caused by temperature change of the pipeline bodies; the connecting part is fixed at the end part of the pipeline body and is used for being connected with the drilling part so as to drive the pipeline body to move through the drilling part; the connecting part is also used for fixing a drill bit part, and the drill bit part is arranged at the front end of the pipeline body. The invention can not only improve the efficiency of pipeline laying, but also avoid the problem of inconvenient ground traffic because the construction is not required to be performed on part of road sections.
Description
Technical Field
The invention relates to the technical field of water supply pipes, in particular to a construction method of an underground water supply pipeline.
Background
The underground water supply and drainage pipeline is used as a main pipeline for urban water delivery, and the urban water supply and drainage speed can be improved by enabling water flow to flow underground through the underground water supply and drainage pipeline.
Underground drainage pipelines are usually buried under urban roads, and pipe ditches are usually required to be excavated when the pipelines are buried, so that the efficiency is low, the construction of enclosure is required, the ground is inconvenient to pass, and a large amount of manpower and material resources are consumed; in addition, preparation before construction such as exploration and positioning is required before digging the pipe trench, which reduces the efficiency of pipeline laying. Accordingly, there is a need to ameliorate one or more of the problems with the related art solutions described above.
It is noted that this section is intended to provide a background or context to the inventive concepts recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Disclosure of Invention
An object of the present invention is to provide a method of constructing an underground water supply pipe, which overcomes, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
The technical scheme provided by the invention is as follows:
a construction method of an underground water supply pipeline comprises the following steps:
a plurality of pipe bodies;
the pipeline compensator is discontinuously arranged among the plurality of pipeline bodies and is used for compensating expansion and contraction caused by temperature change of the pipeline bodies;
the connecting part is fixed at the end part of the pipeline body and is used for being connected with the drilling part so as to drive the pipeline body to move through the drilling part;
the connecting part is also used for fixing a drill bit part, and the drill bit part is arranged at the front end of the pipeline body.
In an embodiment of the present invention, the drilling portion includes:
a drive motor;
the feeding base is connected with the driving motor;
and one end of the telescopic rod is arranged on the feeding base, and the other end of the telescopic rod is abutted to the connecting part of the end part of the pipeline body so as to drive the pipeline body to move together with the drill bit part.
In an embodiment of the present invention, a micro motor is disposed at a rear end of the drill head portion to drive the drill head portion to rotate.
In an embodiment of the invention, a hose packing auger is arranged in the pipeline body in a hollow manner, and one end of the hose packing auger is connected with the rear end of the drill head part so as to convey soil mass drilled by the drill head part to the ground.
In an embodiment of the present invention, the pipe compensator includes a bellows, an end pipe, a bracket, a flange, and a conduit.
The construction method of the underground water supply pipeline comprises the following steps:
digging a construction trench with a preset length in the laying direction of a preset pipeline, wherein the digging depth of the construction trench is more than or equal to the laying depth of the pipeline;
the preset length of the construction groove is the length of a single pipeline body;
placing the pipeline body in the construction groove, and installing a drill bit part at the end part of the pipeline body;
extending a telescopic rod into the pipeline body, enabling the end part of the telescopic rod to be abutted against a connecting part arranged at the end part of the pipeline body, and fixing the telescopic rod on a feeding base;
the feeding base is driven by the driving motor to drive the pipeline body to move horizontally into rock soil together with the drill bit part.
In an embodiment of the present invention, the method further includes: after the pipeline body enters the rock soil, the pipeline body is continuously placed in the construction groove, the pipeline body is connected with the previous pipeline body through the pipeline compensator, and the pipeline body and the previous pipeline body are driven to continuously move in the rock soil through the drilling part.
In an embodiment of the present invention, the method further includes: the pipeline body gets into before the ground, place the hose auger in this pipeline body, the tip of this hose auger set up in the rear of drill bit portion to carry the soil body that the drill bit portion was drilled out to ground.
In one embodiment of the invention, the drilling portion is capable of driving at least two pipe bodies into the ground.
In an embodiment of the present invention, a micro motor is disposed at a rear end of the drill head portion to drive the drill head portion to rotate.
The technical scheme provided by the invention has the following beneficial effects:
according to the implementation method of the underground water supply pipe provided by the embodiment, the connecting part is arranged at the end part of the pipeline body, the drill bit part is fixed by the connecting part, the drilling part is abutted against the connecting part, and the pipeline body can enter rock soil under the condition that a laying ditch is not required to be excavated through the combined action of the drilling part and the drill bit part.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 shows a schematic representation of a subsurface feed pipe in an exemplary embodiment of the invention;
fig. 2 shows a flow diagram of a method of constructing an underground water supply pipe in an exemplary embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of embodiments of the invention, which are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
In the exemplary embodiment, a subterranean feed pipe is first provided. Referring to fig. 1, the underground feed pipe includes a plurality of pipe bodies 100, pipe compensators, and connection parts 101.
The pipeline compensator is discontinuously arranged among the plurality of pipeline bodies 100 and is used for compensating expansion and contraction caused by temperature change of the pipeline bodies 100; the connecting part 101 is fixed at the end of the pipeline body 100 and is used for being connected with the drilling part 200 so as to drive the pipeline body 100 to move through the drilling part 200; the connecting portion 101 is further configured to fix a drill bit 300, and the drill bit 300 is disposed at the front end of the pipe body 100.
Through set up connecting portion 101 at pipeline body 100 tip to fixed drill bit portion 300 of this connecting portion 101, and through drilling portion 200 butt on this connecting portion 101, through the combined action of drilling portion 200 and drill bit portion 300, make pipeline body 100 can get into the ground under the condition that need not excavate the laying ditch canal, this kind of embodiment not only can improve the efficiency of pipe laying, need not enclose the fender construction in part highway section moreover, thereby avoided the current problem in ground.
Next, the above-described respective portions in the present exemplary embodiment will be described in more detail with reference to fig. 1 to 2.
In one embodiment, the pipe compensator is also called a telescopic device or a telescopic joint, an expansion joint, and is used for compensating thermal expansion and contraction caused by temperature change of the pipe, so to cope with thermal stress generated in the pipe, the pipe compensator is discontinuously disposed among the plurality of pipe bodies 100, and the connection among the other pipe bodies 100 is a rigid connection, which can refer to the existing connection method. In addition, a connection part 101 is further provided at an end of the pipe body 100 for abutting against the drilling part 200 to drive the pipe body 100 to move in the ground by the movement of the drilling part 200, and in order to make the pipe body 100 move better in the ground, a drill bit 300 is provided at a front end of the pipe body 100, that is, the connection part 101 of the pipe body 100, so that the pipe body 100 is horizontally placed in the ground by the combined action of the drill bit 300 and the drilling part 200.
In one embodiment, the drilling portion 200 includes: a drive motor 201; a feeding base 202 connected to the driving motor 201; one end of the telescopic rod 203 is disposed on the feeding base 202, and the other end of the telescopic rod is abutted to the connecting portion 101 at the end of the pipe body 100, so as to drive the pipe body 100 to move together with the drill bit 300. Specifically, the driving motor 201 is used for driving the feeding base 202 to reciprocate, the telescopic rod 203 is fixed on the feeding base 202, and a motor may be also arranged on the feeding base 202, and the motor is used for driving the telescopic rod 203 to change the length, but not limited thereto; the telescopic rod 203 partially abuts against the connecting part 101 at the end of the pipe body 100 through the inside of the pipe body 100 to drive the pipe body 100 to move together with the drill bit part 300.
In one embodiment, a micro motor is disposed at the rear end of the drill head 300 to drive the drill head 300 to rotate. Specifically, in order to drive the pipeline body 100 to smoothly enter the rock soil, the drill bit 300 is disposed at the front end of the pipeline body 100, and the micro motor is disposed at the rear end of the drill bit 300, and is used to drive the drill bit 300 to rotate, and a cable for supplying power to the micro motor can be placed in the hollow of the pipeline body 100, but is not limited thereto.
In one embodiment, the pipe body 100 is provided with a hollow hose auger, and one end of the hose auger is connected to the rear end of the drill head 300 to convey soil mass drilled by the drill head 300 to the ground. Specifically, in order to timely convey the soil mass drilled out by the drill bit 300, a hose auger is arranged in the hollow part of the pipeline body 100, the front end of the hose auger is arranged behind the drill bit 300, and the rear end of the hose auger is located on the ground, so that the soil mass drilled out by the drill bit 300 can be timely conveyed to the ground through the hose auger.
In one embodiment, the pipe compensator comprises a bellows, an end pipe, a bracket, a flange, a conduit. Specifically, the pipe compensator is disposed between the two pipe bodies 100, and the specific connection manner can be understood by referring to the existing connection manner, which is not described herein again.
The example embodiment also provides a construction method of the underground water supply pipeline. Referring to fig. 1, a method of constructing an underground water supply pipe includes:
step S101, digging a construction trench with a preset length in the laying direction of a preset pipeline, wherein the digging depth of the construction trench is more than or equal to the laying depth of the pipeline.
Step S102, placing the pipe body 100 in the construction trench, and mounting the bit 300 on an end of the pipe body 100.
Step S103, inserting the retractable rod 203 into the duct body 100, causing the end of the retractable rod 203 to abut against the connecting portion 101 provided at the end of the duct body 100, and fixing the retractable rod 203 to the feeding base 202.
Step S104, driving the feeding base 202 by the driving motor 201 to drive the pipeline body 100 to move horizontally into the rock with the drill bit 300.
In step S101, a construction trench having the same length as the length of the pipe body 100 is excavated in the pipe laying direction, and the depth of the construction trench may be the same as or deeper than the pipe laying depth, which is not limited specifically.
In step S102, the pipe body 100 is placed in the construction groove, the bit 300 is attached to the connection portion 101 at the end of the pipe body 100, and the cable for supplying power to the bit 300 is passed through the hollow portion of the pipe body 100.
In step S103, the retractable rod 203 is extended into the pipeline body 100, the end of the retractable rod 203 abuts against the connecting portion 101 disposed at the end of the pipeline body 100, and the retractable rod 203 is fixed on the feeding base 202, or a motor may be disposed on the feeding base 202 for driving the retractable rod 203 to change the length thereof, which is not limited in particular.
In step S104, the driving motor 201 and the drill bit 300 are turned on to move the pipeline body 100 into the ground together, and the direction of the telescopic rod 203 can be adjusted to ensure that the pipeline body 100 horizontally advances in the ground.
In one embodiment, the method further comprises: after the pipeline body 100 enters the rock soil, the pipeline body 100 is continuously placed in the construction groove, the pipeline body 100 is connected with the previous pipeline body 100 through the pipeline compensator, and the pipeline body 100 and the previous pipeline body 100 are driven to continuously move in the rock soil through the drilling part 200. Specifically, since the feeding device can move in the construction groove, and the telescopic rod 203 can also move for a certain length, after the previous pipeline body 100 enters the rock soil, the pipeline body 100 can be continuously threaded on the telescopic rod 203, the pipeline body 100 and the previous pipeline body 100 are connected through the pipeline compensator, and the drilling part 200 drives the pipeline body 100 and the previous pipeline body 100 to continuously move in the rock soil.
In one embodiment, the method further comprises: before the pipeline body 100 enters the rock soil, the hose auger is placed in the pipeline body 100, and the end part of the hose auger is arranged behind the drill bit part 300 so as to convey the soil body drilled out by the drill bit part 300 to the ground. Specifically, the hose auger may be fixed to the connection part 101 at the front end of the pipe body 100 to transmit the soil mass drilled by the drill head 300 to the ground.
In one embodiment, the drilling portion 200 is capable of drivingly placing at least two pipe bodies 100 in the ground. Specifically, the feeding device can move in the construction trench, and the telescopic rod 203 can also move for a certain length, so that at least two pipeline bodies 100 can be moved and placed in the rock soil through the drilling part 200, but not limited thereto.
In one embodiment, a micro motor is disposed at the rear end of the drill head 300 to drive the drill head 300 to rotate. Specifically, in order to drive the pipeline body 100 to smoothly enter the rock soil, the drill bit 300 is disposed at the front end of the pipeline body 100, and the micro motor is disposed at the rear end of the drill bit 300, and is used to drive the drill bit 300 to rotate, and a cable for supplying power to the micro motor can be placed in the hollow of the pipeline body 100, but is not limited thereto.
Through set up connecting portion 101 at pipeline body 100 tip to fixed drill bit portion 300 of this connecting portion 101, and through drilling portion 200 butt on this connecting portion 101, through the combined action of drilling portion 200 and drill bit portion 300, make pipeline body 100 can get into the ground under the condition that need not excavate the laying ditch canal, this kind of embodiment not only can improve the efficiency of pipe laying, need not enclose the fender construction in part highway section moreover, thereby avoided the current problem in ground.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (6)
1. A construction method of an underground water supply pipeline is characterized by comprising the following steps:
a plurality of pipe bodies;
the pipeline compensator is discontinuously arranged among the plurality of pipeline bodies and is used for compensating expansion and contraction caused by temperature change of the pipeline bodies;
the connecting part is fixed at the end part of the pipeline body and is used for being connected with the drilling part so as to drive the pipeline body to move through the drilling part;
the connecting part is also used for fixing a drill bit part which is arranged at the front end of the pipeline body;
the drilling portion includes:
a drive motor;
the feeding base is connected with the driving motor;
one end of the telescopic rod is arranged on the feeding base, and the other end of the telescopic rod is abutted against the connecting part of the end part of the pipeline body so as to drive the pipeline body to move together with the drill bit part;
the rear end of the drill bit part is provided with a micro motor to drive the drill bit part to rotate;
the pipeline body is hollow and provided with a hose packing auger, and one end of the hose packing auger is connected with the rear end of the drill bit part so as to convey soil drilled by the drill bit part to the ground.
2. A method of constructing an underground water supply pipe according to claim 1,
digging a construction trench with a preset length in the laying direction of a preset pipeline, wherein the digging depth of the construction trench is more than or equal to the laying depth of the pipeline;
the preset length of the construction groove is the length of a single pipeline body;
placing the pipeline body in the construction groove, and installing a drill bit part at the end part of the pipeline body;
extending a telescopic rod into the pipeline body, enabling the end part of the telescopic rod to be abutted against a connecting part arranged at the end part of the pipeline body, and fixing the telescopic rod on a feeding base;
the feeding base is driven by the driving motor to drive the pipeline body to move horizontally into rock soil together with the drill bit part.
3. The construction method according to claim 2, wherein after the pipe body enters the rock soil, the pipe body is continuously placed in the construction trench, and the pipe body is connected with the previous pipe body through the pipe compensator, and then the pipe body and the previous pipe body are driven by the drilling part to continuously move in the rock soil.
4. The construction method according to claim 3, wherein a hose auger is placed in the pipe body before the pipe body enters the rock soil, and an end of the hose auger is disposed behind the bit part to convey soil drilled by the bit part to the ground.
5. The construction method according to claim 4, wherein the drilling portion is capable of driving at least two pipe bodies into the ground.
6. The construction method according to claim 5, wherein a micro motor is provided at a rear end of the bit part to rotate the bit part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320917.1A CN112459799A (en) | 2020-11-23 | 2020-11-23 | Construction method of underground water supply pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320917.1A CN112459799A (en) | 2020-11-23 | 2020-11-23 | Construction method of underground water supply pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN112459799A true CN112459799A (en) | 2021-03-09 |
Family
ID=74799578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011320917.1A Pending CN112459799A (en) | 2020-11-23 | 2020-11-23 | Construction method of underground water supply pipeline |
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| CN (1) | CN112459799A (en) |
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| CN210344519U (en) * | 2019-07-18 | 2020-04-17 | 杭州精盛环境工程有限公司 | Pipe jacking device for underground pipeline construction |
| CN113818904A (en) * | 2021-09-22 | 2021-12-21 | 济南轨道交通集团有限公司 | Pipe jacking construction method for penetrating through leakage area of existing sewage pipe |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1061381A (en) * | 1996-08-13 | 1998-03-03 | Shimizu Corp | Excavating device |
| CN102797474A (en) * | 2012-08-31 | 2012-11-28 | 中国矿业大学 | Three-degree-of-freedom self-walking minitype shield machine |
| CN103046637A (en) * | 2012-12-21 | 2013-04-17 | 广州市市政集团有限公司 | Pipe-jacking construction method utilizing pipeline augering |
| CN103644370A (en) * | 2013-12-04 | 2014-03-19 | 中国石油化工集团公司 | Bury pipeline construction method with self-adjusting function |
| CN104265321A (en) * | 2014-08-06 | 2015-01-07 | 上海隧道工程有限公司 | Ultra-large full-face rectangular pipe jacking tunneling construction method |
| CN104806253A (en) * | 2015-05-15 | 2015-07-29 | 中铁二局股份有限公司 | Construction method for opening hole between rectangular pipe jacking channels |
| CN105201522A (en) * | 2015-10-13 | 2015-12-30 | 上海隧道工程有限公司 | Earth pressure balance push bench |
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| CN113818904A (en) * | 2021-09-22 | 2021-12-21 | 济南轨道交通集团有限公司 | Pipe jacking construction method for penetrating through leakage area of existing sewage pipe |
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