CN106195441B - A kind of non-excavation type integral restoration method suitable for rainwater connecting leg - Google Patents
A kind of non-excavation type integral restoration method suitable for rainwater connecting leg Download PDFInfo
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- CN106195441B CN106195441B CN201510216032.XA CN201510216032A CN106195441B CN 106195441 B CN106195441 B CN 106195441B CN 201510216032 A CN201510216032 A CN 201510216032A CN 106195441 B CN106195441 B CN 106195441B
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- 238000000034 method Methods 0.000 title claims abstract description 49
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- 238000010276 construction Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 5
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 14
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- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
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Abstract
A kind of non-excavation type integral restoration method suitable for rainwater connecting leg, includes following steps：S1：Dredging and pretreatment are carried out to the rainwater connecting leg being repaired；S2：Material for repairing is made according to the size of rainwater connecting leg to be repaired；S3：Deploy spontaneous curing resin；S4：Material to be repaired installs pre-treatment operation；S5：Installation in the pipeline of material for repairing；S6：Pressurizing attaching, pressure stabilizing solidification；S7：End portion treatment.A kind of non-excavation type integral restoration method suitable for rainwater connecting leg of the invention designs a set of no-dig technique entirety recovery scenario for small diameter tube rainwater connecting leg, ensure that construction quality while reducing construction period and construction cost.
Description
Technical Field
The invention belongs to the field of municipal engineering, and particularly relates to a non-excavation type integral repairing method suitable for a rainwater connecting pipe.
Background
In the past, rainwater connecting pipelines buried under roads in cities and industrial areas for draining rainwater on the road surfaces can only be repaired by adopting an excavation method generally due to small diameter of the pipelines, the road surfaces need to be excavated, labor and time are wasted, the traffic is affected, particularly in cities, the construction method is increasingly difficult, and the pressure brought to urban traffic is too large. With the improvement of science and technology, in recent years, rainwater connecting pipes are repaired by adopting integral repair technologies such as hot water curing and local repair technologies such as dotted repair, but considering the arrangement mode that the rainwater connecting pipes are perpendicular to a main pipe, the length of the pipeline is short, and the pipe diameter is small, although the method solves the problem that traffic is influenced by large excavation of a road surface, the hot water curing repair method occupies roads on the same side of a main pipe well and the repair pipeline due to the arrangement mode of the rainwater connecting pipes, the construction time is relatively long, the general curing time is about 8-10 hours (about 24 hours), construction equipment is more, a hot water boiler, a generator, an air compressor and the like are needed, the influence on traffic is large, and due to the particularity of the rainwater connecting pipes, the construction length is short at a time, and the construction cost is large; although the spot repair occupies a small road range and has relatively short construction time, the curing time is generally 2-3 hours (about 8 hours), the construction equipment is few, and only a small amount of equipment such as a small-sized air compressor is needed, the spot repair cannot meet the requirement of the pipeline on the integral repair.
The patent application number is 200410031199.0, and the name is 'an underground pipeline trenchless integral repairing method' which comprises the following steps: on site, welding a stainless steel band with the thickness of 0.2-1 mm into a single-slit stainless steel tube by using an argon arc welding machine, wherein the outer diameter of the stainless steel tube is equal to the inner diameter of a repaired pipeline, pressing the stainless steel tube into a tube with a heart-shaped section, connecting one end of the stainless steel tube with a soft steel wire rope, connecting the other end of the soft steel wire rope with a rubber applicator, conveying the rubber applicator from one end to the other end of the pipeline by using a blower, drawing the soft steel wire rope to place the stainless steel tube into the pipeline, plugging two ends of the pipeline, and inputting pressure water until the stainless steel tube with the heart-shaped section is completely expanded. It solves the trenchless problem mainly by pull-in.
Disclosure of Invention
The invention provides a non-excavation type integral repairing method suitable for a rainwater connecting pipe, aiming at designing a set of non-excavation integral repairing scheme aiming at the rainwater connecting pipe with small pipe diameter, and the technical scheme is as follows:
a non-excavation type integral repairing method suitable for rainwater connecting pipes is characterized by comprising the following steps: the repairing method aims at the rainwater connecting pipe with small pipe diameter of 100mm-400mm, and comprises the following steps:
s1: desilting and pretreating repaired rainwater connecting pipe
The main pipeline is plugged in a conventional way,
washing and cleaning the scaling on the pipe wall and the deposition on the pipe bottom of the rainwater connecting pipe by using high-pressure water,
a sewage pump is erected in the main pipe well to pump out sewage, and garbage in the well is fished out,
then, blowing the pipe wall by using an air blower according to construction requirements, and detecting and confirming the dredging and pretreatment of the pipe;
s2: manufacturing repairing material according to size of to-be-repaired rainwater connecting pipe
The repairing material is glass fiber cloth, firstly measuring the length and the diameter of the pipeline to be repaired,
then cutting 2-4 pieces of rectangular glass fiber cloth with the same size by taking the length of the pipeline to be repaired plus 10cm as the side length and the circumference of the pipeline as the side width;
s3: blending of naturally cured resin
Calculating the dosage of the resin and the curing agent according to engineering,
mixing the resin and the curing agent according to the proportion of 3.5: mixing and stirring the mixture according to the weight ratio of 1-4: 1 to form the required natural curing resin,
the natural curing resin is evenly coated on the two sides of the cut glass fiber cloth and is completely soaked,
setting the initial setting time of the used natural curing resin to be 1-2 hours;
s4: pretreatment operation for installation of material to be repaired
The glass fiber cloth coated with the natural curing resin is horizontally staggered by 8cm-12cm in sequence, stacked and compacted,
secondly, spirally winding the laminated and compacted glass fiber cloth on a pressurized liner attached with an isolating membrane, winding iron wires which are equidistantly distributed on the outer side of the glass fiber cloth along with the glass fiber cloth,
attaching a protective film on the outer side of the wound glass fiber cloth again;
s5: in-conduit installation of materials for repair
Laying an anti-abrasion basement membrane at the bottom of the pipeline and smearing a neutral lubricant,
secondly, one end of a flexible steel wire rope for traction is tied on a binding head pull hole of the pressurizing liner, and the pressurizing liner wound with glass fiber cloth is pulled into the rainwater connecting pipe to be repaired from the main pipe side in a manual or mechanical mode;
s6: pressure applying and pressure stabilizing solidification
Inflating and pressurizing the pressurizing inner container to expand the pressurizing inner container so that the glass fiber cloth coated with the naturally cured resin is tightly attached to the pipe wall of the rainwater connecting pipe to be repaired,
secondly, the current pressure is kept for 2 hours so as to facilitate the glass fiber cloth coated with the natural curing resin to be cured and molded, the curing degree is confirmed by detecting the curing condition of the end part,
finally, continuously maintaining the current pressure for half an hour after the end part is confirmed to be solidified, and ensuring that the whole glass fiber cloth is completely hardened and attached, wherein the pressure is controlled to be 0.03MP-0.05 MP;
s7: end treatment
Firstly, air is discharged and pressure is reduced, the pressurizing inner container is pulled out,
then keeping 10mm of two ports of a new pipe with a lining made of glass fiber cloth and cutting the two ports evenly,
finally, the new nozzle is adhered and leveled with the well wall by using an adhesive.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
the actual amount of resin and curing agent used in step S3 is the calculated amount plus the 10.0% balance.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
the laminated and consolidated fiberglass cloth described in step S4 is archimedes spiral wound.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
the iron wires which are equidistantly distributed on the outer side of the glass fiber cloth in the step S4 are wound every 48-50 cm.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
the isolation film is wound on the pressurized inner container in the step S4 in a spiral manner.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
in step S4, the glass fiber cloth coated with the natural curing resin is first stacked and compacted while being shifted by 9 to 10cm in the transverse direction.
The invention discloses a non-excavation type integral repairing method suitable for a rainwater connecting pipe, which is characterized by comprising the following steps of:
and step S4, the glass fiber cloth forms smooth butt joint with equal thickness on the lap joint part adhered to the pipe wall of the rainwater connecting pipe to be repaired.
The invention relates to a non-excavation type overall restoration method suitable for a rainwater connecting pipe, which is designed aiming at the non-excavation overall restoration of the rainwater connecting pipe with the pipe diameter of 100mm to 400 mm; secondly, the natural curing resin is prepared on site to replace the prior tedious operation of repairing the corresponding link of the hot water curing lining, so that the cost of the link is saved; in the specific step process, a method of staggering and laminating at least 2 pieces of glass fiber cloth is adopted, so that on one hand, the lap width is increased, and the quality is guaranteed; the second aspect makes the trace of the lap joint inconspicuous, and is convenient for maintenance; on the other hand, the use of material cost is reduced; in the next concrete step process, the actual dosage of the resin and the curing agent is selected as the calculated dosage plus 10.0 percent of the allowance, so that the thickness is ensured to meet the requirement; and finally, in the process of the specific steps, according to repeated tests, the scheme that glass fiber cloth is transversely staggered by 10cm in sequence for lamination is adopted for construction in a matched mode, and the scheme that iron wires are wound and fixed at equal intervals of 50cm is adopted for guaranteeing construction quality. The repair scheme provided by the trenchless integral repair method suitable for the rainwater connecting pipe reduces the construction period and the construction cost and ensures the construction quality.
Drawings
Wherein,
FIG. 1 is a schematic flow chart of the process sequence of the present invention;
FIG. 2 is a schematic illustration of the present invention during operation;
FIG. 3 is a schematic diagram of a cut glass fiber cloth and its lamination in accordance with an embodiment of the present invention;
FIG. 4 is an effect diagram of the lapping opening after the glass fiber cloth is spread.
Detailed Description
Hereinafter, a non-excavation type integral repairing method suitable for a rainwater connecting pipe according to the present invention will be described in further detail with reference to the drawings and the detailed description.
The trenchless integral repairing method for the rainwater connecting pipe, which is shown in figure 1, aims at the rainwater connecting pipe with small pipe diameter of 100mm-400mm, and comprises the following steps:
s1: desilting and pretreating repaired rainwater connecting pipe
The main pipeline is plugged in a conventional way,
washing and cleaning the scaling on the pipe wall and the deposition on the pipe bottom of the rainwater connecting pipe by using high-pressure water,
a sewage pump is erected in the main pipe well to pump out sewage, and garbage in the well is fished out,
then, blowing the pipe wall by using an air blower according to construction requirements, and detecting and confirming the dredging and pretreatment of the pipe;
s2: manufacturing repairing material according to size of to-be-repaired rainwater connecting pipe
The repairing material is glass fiber cloth, firstly measuring the length and the diameter of the pipeline to be repaired,
then cutting 2-4 pieces of rectangular glass fiber cloth with the same size by taking the length of the pipeline to be repaired plus 10cm as the side length and the circumference of the pipeline as the side width;
s3: blending of naturally cured resin
Calculating the dosage of the resin and the curing agent according to engineering,
mixing the resin and the curing agent according to the proportion of 3.5: mixing and stirring the mixture according to the weight ratio of 1-4: 1 to form the required natural curing resin,
the natural curing resin is evenly coated on the two sides of the cut glass fiber cloth and is completely soaked,
setting the initial setting time of the used natural curing resin to be 1-2 hours;
s4: pretreatment operation for installation of material to be repaired
The glass fiber cloth coated with the natural curing resin is horizontally staggered by 8cm-12cm in sequence, stacked and compacted,
secondly, spirally winding the laminated and compacted glass fiber cloth on a pressurized liner attached with an isolating membrane, winding iron wires which are equidistantly distributed on the outer side of the glass fiber cloth along with the glass fiber cloth,
attaching a protective film on the outer side of the wound glass fiber cloth again;
s5: in-conduit installation of materials for repair
Laying an anti-abrasion basement membrane at the bottom of the pipeline and smearing a neutral lubricant,
secondly, one end of a flexible steel wire rope for traction is tied on a binding head pull hole of the pressurizing liner, and the pressurizing liner wound with glass fiber cloth is pulled into the rainwater connecting pipe to be repaired from the main pipe side in a manual or mechanical mode;
s6: pressure applying and pressure stabilizing solidification
Inflating and pressurizing the pressurizing inner container to expand the pressurizing inner container so that the glass fiber cloth coated with the naturally cured resin is tightly attached to the pipe wall of the rainwater connecting pipe to be repaired,
secondly, the current pressure is kept for 2 hours so as to facilitate the glass fiber cloth coated with the natural curing resin to be cured and molded, the curing degree is confirmed by detecting the curing condition of the end part,
finally, continuously maintaining the current pressure for half an hour after the end part is confirmed to be solidified, and ensuring that the whole glass fiber cloth is completely hardened and attached, wherein the pressure is controlled to be 0.03MP-0.05 MP;
s7: end treatment
Firstly, air is discharged and pressure is reduced, the pressurizing inner container is pulled out,
then keeping 10mm of two ports of a new pipe with a lining made of glass fiber cloth and cutting the two ports evenly,
finally, the new nozzle is adhered and leveled with the well wall by using an adhesive.
Wherein the curing agent is NJ-1.
Wherein the actual amount of resin and curing agent used in step S3 is the calculated amount plus the 10.0% balance.
Wherein the laminated and compacted glass fiber cloth described in step S4 is wound in an archimedes spiral.
Wherein, the iron wires which are equidistantly distributed on the outer side of the glass fiber cloth in the step S4 are wound every 48 cm-50 cm.
Wherein, the mode of winding the isolating membrane on the pressurizing inner container in the step S4 is spiral winding.
In step S4, the glass fiber cloth coated with the naturally cured resin is first stacked and compacted while being shifted in the transverse direction by 9 to 10 cm.
And in the step S4, the glass fiber cloth forms smooth butt joint with the same thickness as the whole at the lap joint adhered to the pipe wall of the rainwater connecting pipe to be repaired.
Examples
As shown in fig. 2, a schematic structural diagram of the present invention in use includes the following steps: 1. preparation work: the construction equipment is parked according to construction requirements, and construction materials and the like are ready; 2. dredging a pipeline: plugging the main pipeline, washing scales on the pipe wall of the connecting pipe by using high-pressure water, clearing deposits at the pipe bottom, pumping out sewage affecting construction in the pipe, and drying the pipe wall by using an air blower to the degree required by the construction; 3. detecting a pipeline: carrying out CCTV (television-coded closed caption) video detection on the pipeline, confirming that no factor influencing the construction exists in the pipeline to be repaired, and carrying out the next construction; 4. cutting the glass fiber material on site: cutting a glass fiber material on site according to the construction design requirement, wherein three pieces of rectangular glass fiber cloth (shown in figure 3) with the same size are cut according to the length and the diameter of a pipeline, the length of the pipeline plus 10cm is taken as a long side, and the length of the inner perimeter of the pipeline is taken as a wide side; 5. resin impregnation: calculating the dosage of the resin and the curing agent, blending the epoxy resin and the NJ-1 curing agent according to a formula of 4:1 on site, uniformly stirring, uniformly coating the resin on two sides of 3 pieces of glass fiber cloth to completely soak the glass fibers, wherein the actual dosage of the resin is more than 10.0 percent of the designed dosage; 6. winding and fixing: 3 pieces of glass fiber cloth soaked with resin are transversely and sequentially staggered by 10cm, stacked and compacted, the glass fiber cloth soaked with the resin is spirally wound on a pressurized liner attached with an isolating film (the isolating film is a film similar to a preservative film, so that the pressurized liner is easy to pull out), and a protective film is wrapped on the pressurized liner, and the protective film is spirally wound and fixed by a thin iron wire every 50 cm; 7. drawing and installing: laying an anti-abrasion bottom membrane at the bottom of a pipeline and smearing a neutral lubricant, reserving a rope in the pipeline during CCTV detection, putting a tying head of a pressurized inner container wound with a glass fiber material into an inspection well from the side of a main pipe, tying the rope at the side of the main pipe well on a pulling hole of the tying head of the inner container, pulling the inner container wound with the material into a rainwater pipeline to be repaired manually or mechanically, confirming that the positions of the pressurized inner container and the material meet the construction requirements, and confirming that the glass fiber material exposed from a pipe orifice cannot be less than 30 mm; 8. pressurizing and attaching: confirming that the installation of the material meets the construction requirement, namely inflating, pressurizing and expanding the liner through the air holes on the binding heads at the end parts of the pressure liner, wherein the construction pressure is controlled to be between 0.03MP and 0.05MP, so that the glass fiber material impregnated with resin is spread and tightly attached to the wall of the old pipe, and the current construction pressure is kept; 9. and (3) voltage stabilization and solidification: continuing to keep the construction pressure for 2 hours to cure the glass fiber material soaked with the resin, and continuing to maintain the original air pressure for 30 minutes after confirming the end curing to ensure that the whole new glass fiber material pipe is completely hardened and attached; 10. end part treatment: deflating and decompressing, pulling out the inner container, keeping 10mm of the two ports of the new pipe lined with the lining to be cut evenly, and adhering and smoothing the new pipe orifice and the well wall by using an adhesive; 11. and (4) finishing construction: and carrying out CCTV (television for TV) detection after construction, keeping video data, cleaning a field and removing the field. The resin is epoxy resin, and the pressurizing liner is made of PU film, TPU film or high-strength plastic film material.
After the construction process is implemented, a novel lining new pipe which is waterproof and has certain toughness and tensile strength is formed in the original pipeline, the novel lining new pipe can resist the phenomena of cracks, water leakage and the like caused by expansion, contraction or slight disturbance of structures, drainage pipeline joints and the like, is convenient to construct, has no seams, good integrity and high hardening speed, and is suitable for preventive repair engineering of rainwater connecting pipes or similar small-pipe-diameter short-length pipelines.
The invention relates to a non-excavation type overall restoration method suitable for a rainwater connecting pipe, which is designed aiming at the non-excavation overall restoration of the rainwater connecting pipe with the pipe diameter of 100mm to 400 mm; secondly, the natural curing resin is prepared on site to replace the prior tedious operation of repairing the corresponding link of the hot water curing lining, so that the cost of the link is saved; in the specific step process, a method of staggering and laminating at least 2 pieces of glass fiber cloth is adopted, so that on one hand, the lap width is increased, and the quality is guaranteed; the second aspect makes the trace of the lap joint inconspicuous, and is convenient for maintenance; on the other hand, the use of material cost is reduced; in the next concrete step process, the actual dosage of the resin and the curing agent is selected as the calculated dosage plus 10.0 percent of the allowance, so that the thickness is ensured to meet the requirement; and finally, in the process of the specific steps, according to repeated tests, the scheme that glass fiber cloth is transversely staggered by 10cm in sequence for lamination is adopted for construction in a matched mode, and the scheme that fine iron wires are wound and fixed at equal intervals of 50cm is adopted for ensuring the construction quality. The repair scheme provided by the trenchless integral repair method suitable for the rainwater connecting pipe reduces the construction period and the construction cost and ensures the construction quality.
Claims (7)
1. A non-excavation type integral repairing method suitable for rainwater connecting pipes is characterized by comprising the following steps: the repairing method aims at the rainwater connecting pipe with small pipe diameter of 100mm-400mm, and comprises the following steps:
s1: desilting and pretreating repaired rainwater connecting pipe
The main pipeline is plugged in a conventional way,
washing and cleaning the scaling on the pipe wall and the deposition on the pipe bottom of the rainwater connecting pipe by using high-pressure water,
a sewage pump is erected in the main pipe well to pump out sewage, and garbage in the well is fished out,
then, blowing the pipe wall by using an air blower according to construction requirements, and detecting and confirming the dredging and pretreatment of the pipe;
s2: manufacturing repairing material according to size of to-be-repaired rainwater connecting pipe
The repairing material is glass fiber cloth, firstly measuring the length and the diameter of the pipeline to be repaired,
then cutting 2-4 pieces of rectangular glass fiber cloth with the same size by taking the length of the pipeline to be repaired plus 10cm as the side length and the circumference of the pipeline as the side width;
s3: blending of naturally cured resin
Calculating the dosage of the resin and the curing agent according to engineering,
mixing the resin and the curing agent according to the proportion of 3.5: mixing and stirring the mixture according to the weight ratio of 1-4: 1 to form the required natural curing resin,
the natural curing resin is evenly coated on the two sides of the cut glass fiber cloth and is completely soaked,
setting the initial setting time of the used natural curing resin to be 1-2 hours;
s4: pretreatment operation for installation of material to be repaired
The glass fiber cloth coated with the natural curing resin is horizontally staggered by 8cm-12cm in sequence, stacked and compacted,
secondly, spirally winding the laminated and compacted glass fiber cloth on a pressurized liner attached with an isolating membrane, winding iron wires which are equidistantly distributed on the outer side of the glass fiber cloth along with the glass fiber cloth,
attaching a protective film on the outer side of the wound glass fiber cloth again;
s5: in-conduit installation of materials for repair
Laying an anti-abrasion basement membrane at the bottom of the pipeline and smearing a neutral lubricant,
secondly, one end of a flexible steel wire rope for traction is tied on a binding head pull hole of the pressurizing liner, and the pressurizing liner wound with glass fiber cloth is pulled into the rainwater connecting pipe to be repaired from the main pipe side in a manual or mechanical mode;
s6: pressure applying and pressure stabilizing solidification
Inflating and pressurizing the pressurizing inner container to expand the pressurizing inner container so that the glass fiber cloth coated with the naturally cured resin is tightly attached to the pipe wall of the rainwater connecting pipe to be repaired,
secondly, the current pressure is kept for 2 hours so as to facilitate the glass fiber cloth coated with the natural curing resin to be cured and molded, the curing degree is confirmed by detecting the curing condition of the end part,
finally, continuously maintaining the current pressure for half an hour after the end part is confirmed to be solidified, and ensuring that the whole glass fiber cloth is completely hardened and attached, wherein the pressure is controlled to be 0.03MP-0.05 MP;
s7: end treatment
Firstly, air is discharged and pressure is reduced, the pressurizing inner container is pulled out,
then keeping 10mm of two ports of a new pipe with a lining made of glass fiber cloth and cutting the two ports evenly,
finally, the new nozzle is adhered and leveled with the well wall by using an adhesive.
2. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
the actual amount of resin and curing agent used in step S3 is the calculated amount plus the 10.0% balance.
3. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
the laminated and consolidated fiberglass cloth described in step S4 is archimedes spiral wound.
4. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
the iron wires equidistantly distributed outside the glass fiber cloth in the step S4 are wound every 48-50 cm.
5. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
the isolation film is wound on the pressurized inner container in the step S4 in a spiral manner.
6. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
in step S4, the glass fiber cloth coated with the natural curing resin is first stacked and compacted while being shifted by 9 to 10cm in the transverse direction.
7. The trenchless integral restoration method for the rainwater connecting pipe according to claim 1, wherein the trenchless integral restoration method comprises the following steps:
and step S4, the glass fiber cloth forms smooth butt joint with equal thickness on the lap joint part adhered to the pipe wall of the rainwater connecting pipe to be repaired.
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| CN201510216032.XA CN106195441B (en) | 2015-04-30 | 2015-04-30 | A kind of non-excavation type integral restoration method suitable for rainwater connecting leg |
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| CN106678492A (en) * | 2016-12-27 | 2017-05-17 | 广州市市政集团有限公司 | Construction method for repairing collapsing pipeline in non-excavation manner |
| CN107217722A (en) * | 2017-07-20 | 2017-09-29 | 佛山市立笙纺织有限公司 | The construction technology that a kind of sewage conduct is replaced over long distances |
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