CN106195441A - A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg - Google Patents
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg Download PDFInfo
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- CN106195441A CN106195441A CN201510216032.XA CN201510216032A CN106195441A CN 106195441 A CN106195441 A CN 106195441A CN 201510216032 A CN201510216032 A CN 201510216032A CN 106195441 A CN106195441 A CN 106195441A
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- connecting leg
- rainwater connecting
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Abstract
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg, includes following steps: S1: the rainwater connecting leg being repaired is carried out desilting and pretreatment；S2: make material for repairing according to the size of rainwater connecting leg to be repaired；S3: allotment spontaneous curing resin；Pre-treatment operation installed by S4: material to be repaired；Install in the pipeline of S5: material for repairing；S6: pressurizing attaching, voltage stabilizing solidification；S7: end portion treatment.A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg of the present invention, designs a set of no-dig technique entirety recovery scenario for pipe with small pipe diameter rainwater connecting leg, ensure that construction quality while reducing construction period and construction cost.
Description
Technical field
The invention belongs to municipal works field, be specifically related to a kind of non-excavation type entirety reparation side being applicable to rainwater connecting leg
Method.
Background technology
In the past in city, the rainwater for rainwater on road surface discharge that is embedded in below road of industrial occupancy connect pipeline rehabilitation due to pipe
Road diameter is less, the method that typically can only use excavation, needs excavated pavement, time-consuming, affects traffic, especially exists
City, this construction method is the most difficult, and the pressure brought to urban transportation is the biggest.Along with the lifting of science and technology, the most also
There is the local route repair technology such as integral repair technology and point-like reparation such as using water cure to repair rainwater connecting leg, but consider
Rainwater connecting leg and the vertical arrangement mode of supervisor and duct length is shorter, caliber is less, although said method solves road surface
Heavy excavation affects the problem of traffic, but the restorative procedure of water cure take because of the arrangement mode of rainwater connecting leg supervisor's well and
The road of pipe-repairing homonymy, engineering time are relative the longest, (the engineering time about 8-10 hour general hardening time
About 24 hours), construction equipment is many, needs hot-water boiler, electromotor, air compressor machine etc., the biggest to traffic impact,
Separately due to the particularity of rainwater connecting leg, single construction length is shorter, and construction cost is bigger；Although point-like reparation accounts for road scope
Less, the engineering time is relatively short, and 2-3 hour general hardening time (about 8 hours engineering time), construction equipment is relatively
Few, only need a small amount of equipment such as small-sized air compressor, but point-like reparation can not meet the demand that globality is repaired by pipeline.
Number of patent application is 200410031199.0, and entitled " a kind of underground piping does not excavate integral restoration method " includes
Following steps: the on-the-spot list that is welded into by the stainless steel band argon arc welding machine of thickness 0.2-1 stitches stainless steel tube, stainless steel tube
Outside dimension equal to being repaired the internal diameter size of pipeline, it is heart-shaped pipe that stainless steel tube is pressed into cross section, stainless steel tube
One end be connected with flexible steel cable, the flexible steel cable other end is connected with rubber applicator, with pressure fan by rubber applicator from
One end of pipeline is transported to the other end, and stainless steel tube is inserted in pipeline by traction flexible steel cable, pipe ends is blocked
And input pressure water to cross section is the heart-shaped complete distending of stainless steel tube.It is mainly by drawing in formula solution no-dig technique
Problem.
Summary of the invention
The scheme repaired for a set of rainwater connecting leg no-dig technique entirety for pipe with small pipe diameter of design, the invention provides a kind of being suitable for
In the non-excavation type integral restoration method of rainwater connecting leg, its technical scheme is specific as follows:
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg, it is characterised in that: the method includes following step
Rapid:
S1: the rainwater connecting leg being repaired is carried out desilting and pretreatment
Main pipeline is blocked routinely,
By the deposition at the bottom of the fouling of water under high pressure flush clean rainwater connecting leg tube wall and pipe,
In supervisor's well, set up sewage pump extracted out by sewage, and pull rubbish in well out,
Then according to construction requirement aerator, tube wall is dried up, pipe dredging and pretreatment are carried out detection and confirms；
S2: make material for repairing according to the size of rainwater connecting leg to be repaired
Described repair materials is glass fabric, first measures length and the diameter of pipeline to be repaired,
Then with duct length+10cm to be repaired as the length of side, with pipeline Zhou Changwei hem width, the equal size of cutting 2-4 block
Rectangle glass fiber cloth；
S3: allotment spontaneous curing resin
According to engineering calculation resin and hardener dose,
Resin and firming agent are carried out mix and blend according to the weight ratio of 3.5:1 4:1 and form required spontaneous curing resin,
Spontaneous curing resin uniform application in the two sides of the glass fabric cut and is impregnated with completely,
The presetting period of spontaneous curing resin used is set as 1-2 hour；
Pre-treatment operation installed by S4: material to be repaired
The glass fabric being coated with spontaneous curing resin is staggered the most successively 8cm-12cm stacking being compacted,
Secondly by stacking the glass fabric spiral winding that has been compacted to on the supercharging inner bag of isolating membrane, along with glass
Also having that fiber cloth is wound around together is equidistantly distributed in the iron wire outside glass fabric,
Outside the glass fabric wound, again adhere to protecting film；
Install in the pipeline of S5: material for repairing
Lay anti-wear counterdie in duct bottom and smear neutral lubricant,
Secondly traction flexible steel cable one end is lain on the bundle head pulling eye of supercharging inner bag, use artificial or mechanical mode
The supercharging inner bag being wound with glass fabric is entered in rainwater connecting leg pipe to be repaired by being responsible for layback；
S6: pressurizing attaching, voltage stabilizing solidification
Carrying out pneumatic compression supercharging inner bag makes it expand, so that the glass fabric being coated with spontaneous curing resin is tight
The closely connected tube wall being bonded to rainwater connecting leg to be repaired,
Secondly current pressure is kept 2 hours, in order to smear the glass fiber material curing molding of spontaneous curing resin, logical
Cross detection end solidification situation and confirm state of cure,
After confirming end solidification, finally continue to current pressure half an hour, it is ensured that the fully hardened patch of whole glass fabric
Closing, wherein, described Stress control is at 0.03MP-0.05MP；
S7: end portion treatment
First exit decompression, pull out supercharging inner bag,
Then the liner new pipe ends mouth that glass fabric is constituted is retained 10mm to trim,
Finally use binding agent by floating with borehole wall bonding for the new mouth of pipe.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
Described restorative procedure is for the pipe with small pipe diameter rainwater connecting leg of 100mm-400mm.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
In step S3, the actual amount of resin and firming agent is to calculate the surplus that consumption adds 10.0%.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
Glass fabric after stacking described in step S4 is that Archimedes spiral is wound around.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
The iron wire that has equidistantly been fastened described in step S4 is specially every 48cm 50cm and is wound around.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
It is spiral winding that isolating membrane described in step S4 is wrapped in the mode on supercharging inner bag.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
First the glass fabric being coated with spontaneous curing resin is staggered by step S4 the most successively 9-10cm stacking pressing
Real.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg according to the present invention, it is characterised in that:
Glass fabric described in step S4 taking after the tube wall fitting in rainwater connecting leg to be repaired forms entirety at mouth
The smooth docking of equal thickness.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg of the present invention, first against 100mm to 400mm
The no-dig technique entirety repair capsule of the rainwater connecting leg of caliber forms；Secondly, allocate spontaneous curing resin by scene, substitute
Water cure liner repaired the loaded down with trivial details operation of corresponding link in the past, saved the cost of this link；Again in concrete step
During Zhou, use at least 2 blocks of glass fabrics to stagger the method for stacking, on the one hand joining seam width is increased, beneficially matter
Amount ensures；Second aspect makes vestige at whip stitch inconspicuous, it is simple to maintenance；Another further aspect reduces the use of material cost；From
Secondary during concrete steps, the actual amount selecting resin and firming agent is to calculate the surplus that consumption adds 10.0%, it is ensured that
Thickness reaches requirement；Last during concrete steps, use glass fabric to stagger the most successively according to repetition test
The scheme coordinative construction of 10cm stacking, use equidistant 50cm be fastened iron wire scheme ensure construction quality.The one of the present invention
Plant and be applicable to the recovery scenario that the non-excavation type integral restoration method of rainwater connecting leg is provided, reducing construction period and construction
Construction quality is ensure that while cost.
Accompanying drawing explanation
Wherein,
Fig. 1 is the technique step sequence schematic flow sheet of the present invention；
Fig. 2 is schematic diagram during Specific construction of the present invention；
Fig. 3 is shape after glass fabric cutting and stacking schematic diagram in the embodiment of the present invention；
Fig. 4 is to take the design sketch at mouth after the glass fabric in the present invention struts.
Detailed description of the invention
Below, according to the specification drawings and specific embodiments a kind of non-excavation type being applicable to rainwater connecting leg to the present invention
Integral restoration method is further described in detail.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg as shown in Figure 1, includes following steps:
S1: the rainwater connecting leg being repaired is carried out desilting and pretreatment
Main pipeline is blocked routinely,
By the deposition at the bottom of the fouling of water under high pressure flush clean rainwater connecting leg tube wall and pipe,
In supervisor's well, set up sewage pump extracted out by sewage, and pull rubbish in well out,
Then according to construction requirement aerator, tube wall is dried up, pipe dredging and pretreatment are carried out detection and confirms；
S2: make material for repairing according to the size of rainwater connecting leg to be repaired
Described repair materials is glass fabric, first measures length and the diameter of pipeline to be repaired,
Then with duct length+10cm to be repaired as the length of side, with pipeline Zhou Changwei hem width, the equal size of cutting 2-4 block
Rectangle glass fiber cloth；
S3: allotment spontaneous curing resin
According to engineering calculation resin and hardener dose,
Resin and firming agent are carried out mix and blend according to the weight ratio of 3.5:1 4:1 and form required spontaneous curing resin,
Spontaneous curing resin uniform application in the two sides of the glass fabric cut and is impregnated with completely,
The presetting period of spontaneous curing resin used is set as 1-2 hour；
Pre-treatment operation installed by S4: material to be repaired
The glass fabric being coated with spontaneous curing resin is staggered the most successively 8cm-12cm stacking being compacted,
Secondly by stacking the glass fabric spiral winding that has been compacted to on the supercharging inner bag of isolating membrane, along with glass
Also having that fiber cloth is wound around together is equidistantly distributed in the iron wire outside glass fabric,
Outside the glass fabric wound, again adhere to protecting film；
Install in the pipeline of S5: material for repairing
Lay anti-wear counterdie in duct bottom and smear neutral lubricant,
Secondly traction flexible steel cable one end is lain on the bundle head pulling eye of supercharging inner bag, use artificial or mechanical mode
The supercharging inner bag being wound with glass fabric is entered in rainwater connecting leg pipe to be repaired by being responsible for layback；
S6: pressurizing attaching, voltage stabilizing solidification
Carrying out pneumatic compression supercharging inner bag makes it expand, so that the glass fabric being coated with spontaneous curing resin is tight
The closely connected tube wall being bonded to rainwater connecting leg to be repaired,
Secondly current pressure is kept 2 hours, in order to smear the glass fiber material curing molding of spontaneous curing resin, logical
Cross detection end solidification situation and confirm state of cure,
After confirming end solidification, finally continue to current pressure half an hour, it is ensured that the fully hardened patch of whole glass fabric
Closing, wherein, described Stress control is at 0.03MP-0.05MP；
S7: end portion treatment
First exit decompression, pull out supercharging inner bag,
Then the liner new pipe ends mouth that glass fabric is constituted is retained 10mm to trim,
Finally use binding agent by floating with borehole wall bonding for the new mouth of pipe.
Wherein, described restorative procedure is for the pipe with small pipe diameter rainwater connecting leg of 100mm-400mm.
Wherein, selected firming agent is NJ-1.
Wherein, in step S3, the actual amount of resin and firming agent is to calculate the surplus that consumption adds 10.0%.
Wherein, the glass fabric after the stacking described in step S4 is that Archimedes spiral is wound around.
Wherein, the iron wire that has equidistantly been fastened described in step S4 is specially every 48cm 50cm winding.
Wherein, the isolating membrane described in step S4 is wrapped in the mode on supercharging inner bag is spiral winding.
Wherein, first stagger the most successively in step S4 9cm 10cm by the glass fabric being coated with spontaneous curing resin
Stacking is also compacted.
Wherein, the glass fabric described in step S4 takes shape at mouth after the tube wall fitting in rainwater connecting leg to be repaired
The smooth docking of integral equal thickness.
Embodiment
As in figure 2 it is shown, structural representation when coming into operation for the present invention, it concretely comprises the following steps: 1, preparation: will execute
Construction equipment is parked by construction demand, and construction material etc. is ready；2, pipe dredging: main pipeline is blocked, uses water under high pressure
The fouling of flush clean connecting leg tube wall, clears out the deposition at the bottom of pipe, is extracted out by the sewage of impact construction in pipe, will with aerator
Tube wall dries up the degree to construction requirement；3, pipe detection: pipeline is carried out CCTV telephotography detection, confirms to be repaired
Do not affect the factor of construction in multiple pipeline, carry out next step construction；4, on-the-spot cutting glass fiber material: according to construction
Design requires glass fiber material carries out on-the-spot cutting, according to length and the diameter of pipeline, adds 10cm's by duct length
A length of long limit, a length of broadside of girth in pipeline, the rectangle glass fiber cloth of three pieces of equal sizes of cutting is (such as Fig. 3
Shown in)；5, resin dipping: calculate resin and hardener dose, epoxy resin and NJ-1 firming agent are pressed formula 4:1 by scene
Allotment, stirs, by resin uniform application on the two sides of 3 blocks of glass fabrics, makes glass fibre all infiltrate, actual
Resin demand preferably adds 10.0% surplus than design quantity；6, it is fastened: by horizontal for 3 blocks of glass fabrics of infiltration resin
Stagger successively 10cm stacking being compacted, the glass fibre spiral containing resin pickup is twined to (the described isolating membrane with isolating membrane
For the thin film of similar preservative film, supercharging inner bag is made easily to pull out) on supercharging inner bag and wrap up protecting film, every 50cm mono-section,
Fix with thin wire spiral winding；7, installation is drawn in: lay anti-wear counterdie in duct bottom and smear neutral lubricant,
In pipe, reserve a rope during CCTV detection, the supercharging inner bag being wound with glass fiber material is pricked head and is put by being responsible for side
Enter inspection shaft, the rope of supervisor well side is tied up to inner bag and pricks on head pulling eye, the inner bag of winding material is used manually or mechanically
Mode draws in storm sewer to be repaired, confirms that the position of supercharging inner bag and material meets construction requirement, confirms what the mouth of pipe exposed
Glass fiber material can not be less than 30mm；8, pressurizing attaching: confirm that material is installed and meet construction requirement, can be by pressure
The pore that power inner bag end is pricked on head expands to inner bag inflating pressure, and operation pressure size should control at 0.03MP-0.05MP
Between, make the glass fiber material of impregnating resin open and closely adhere to old tube wall, keep current operation pressure；9, steady
Cured: to continue to keep operation pressure 2 hours, make to have infiltrated the glass fiber material solidification of resin, confirming that end is solid
Continue to Primordial Qi after change press 30 minutes, it is ensured that fully hardened laminating newly managed by whole glass fiber material；10, end portion treatment:
Venting decompression, pulls out inner bag, trims retaining 10mm at new for liner pipe ends mouth, uses binding agent by the new mouth of pipe and well
Wall bonding is floating；11, complete construction: after construction, carry out CCTV TV detection, retain Video Document, place cleaning,
Withdraw.Wherein, described resin is epoxy resin, and described supercharging inner bag is by PU film, TPU membrane or highstrenghtpiston
Thin-film material is made.
By above work progress implement after, be formed for one in former pipeline the most water-fast but also waterproof, and have certain tenacity and
The novel lining of tensile strength is newly managed, and can resist structures, drainage pipeline joint etc. because expanding, shrink or slight disturbance being drawn
The crack risen, the phenomenon such as leak, easy construction, seamless, good integrity, setting rate is fast, it is adaptable to rainwater connecting leg
Or similar pipe with small pipe diameter, the preventative recovery project of the pipeline that length is short.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg of the present invention, first against 100mm to 400mm
The no-dig technique entirety repair capsule of the rainwater connecting leg of caliber forms；Secondly, allocate spontaneous curing resin by scene, substitute
Water cure liner repaired the loaded down with trivial details operation of corresponding link in the past, saved the cost of this link；Again in concrete step
During Zhou, use at least 2 blocks of glass fabrics to stagger the method for stacking, on the one hand joining seam width is increased, beneficially matter
Amount ensures；Second aspect makes vestige at whip stitch inconspicuous, it is simple to maintenance；Another further aspect reduces the use of material cost；From
Secondary during concrete steps, the actual amount selecting resin and firming agent is to calculate the surplus that consumption adds 10.0%, it is ensured that
Thickness reaches requirement；Last during concrete steps, use glass fabric to stagger the most successively according to repetition test
The scheme coordinative construction of 10cm stacking, use equidistant 50cm be fastened thin wire scheme ensure construction quality.The present invention's
The recovery scenario that a kind of non-excavation type integral restoration method being applicable to rainwater connecting leg is provided, is reducing construction period and is executing
Construction quality is ensure that while work cost.
Claims (8)
1. the non-excavation type integral restoration method being applicable to rainwater connecting leg, it is characterised in that: the method includes following
Step:
S1: the rainwater connecting leg being repaired is carried out desilting and pretreatment
Main pipeline is blocked routinely,
By the deposition at the bottom of the fouling of water under high pressure flush clean rainwater connecting leg tube wall and pipe,
In supervisor's well, set up sewage pump extracted out by sewage, and pull rubbish in well out,
Then according to construction requirement aerator, tube wall is dried up, pipe dredging and pretreatment are carried out detection and confirms；
S2: make material for repairing according to the size of rainwater connecting leg to be repaired
Described repair materials is glass fabric, first measures length and the diameter of pipeline to be repaired,
Then with duct length+10cm to be repaired as the length of side, with pipeline Zhou Changwei hem width, the equal size of cutting 2-4 block
Rectangle glass fiber cloth；
S3: allotment spontaneous curing resin
According to engineering calculation resin and hardener dose,
Resin and firming agent are carried out mix and blend according to the weight ratio of 3.5:1 4:1 and form required spontaneous curing resin,
Spontaneous curing resin uniform application in the two sides of the glass fabric cut and is impregnated with completely,
The presetting period of spontaneous curing resin used is set as 1-2 hour；
Pre-treatment operation installed by S4: material to be repaired
The glass fabric being coated with spontaneous curing resin is staggered the most successively 8cm-12cm stacking being compacted,
Secondly by stacking the glass fabric spiral winding that has been compacted to on the supercharging inner bag of isolating membrane, along with glass
Also having that fiber cloth is wound around together is equidistantly distributed in the iron wire outside glass fabric,
Outside the glass fabric wound, again adhere to protecting film；
Install in the pipeline of S5: material for repairing
Lay anti-wear counterdie in duct bottom and smear neutral lubricant,
Secondly traction flexible steel cable one end is lain on the bundle head pulling eye of supercharging inner bag, use artificial or mechanical mode
The supercharging inner bag being wound with glass fabric is entered in rainwater connecting leg pipe to be repaired by being responsible for layback；
S6: pressurizing attaching, voltage stabilizing solidification
Carrying out pneumatic compression supercharging inner bag makes it expand, so that the glass fabric being coated with spontaneous curing resin is tight
The closely connected tube wall being bonded to rainwater connecting leg to be repaired,
Secondly current pressure is kept 2 hours, in order to smear the glass fiber material curing molding of spontaneous curing resin, logical
Cross detection end solidification situation and confirm state of cure,
After confirming end solidification, finally continue to current pressure half an hour, it is ensured that the fully hardened patch of whole glass fabric
Closing, wherein, described Stress control is at 0.03MP-0.05MP；
S7: end portion treatment
First exit decompression, pull out supercharging inner bag,
Then the liner new pipe ends mouth that glass fabric is constituted is retained 10mm to trim,
Finally use binding agent by floating with borehole wall bonding for the new mouth of pipe.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
Described restorative procedure is for the pipe with small pipe diameter rainwater connecting leg of 100mm-400mm.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
In step S3, the actual amount of resin and firming agent is to calculate the surplus that consumption adds 10.0%.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
Glass fabric after stacking described in step S4 is that Archimedes spiral is wound around.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
The iron wire that has equidistantly been fastened described in step S4 is specially every 48cm 50cm and is wound around.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
It is spiral winding that isolating membrane described in step S4 is wrapped in the mode on supercharging inner bag.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
First the glass fabric being coated with spontaneous curing resin is staggered by step S4 the most successively 9-10cm stacking pressing
Real.
A kind of non-excavation type integral restoration method being applicable to rainwater connecting leg the most according to claim 1, its feature exists
In:
Glass fabric described in step S4 taking after the tube wall fitting in rainwater connecting leg to be repaired forms entirety at mouth
The smooth docking of equal thickness.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107763362A (en) * | 2017-10-12 | 2018-03-06 | 济南普利市政管网工程有限责任公司 | Interior piston ring method pipe joint method for repairing and constructing |
| CN108895241A (en) * | 2018-09-13 | 2018-11-27 | 浙江景迈环境工程有限公司 | A kind of dotted in-situ immobilization technique of blow-off line |
| CN109680782A (en) * | 2018-12-21 | 2019-04-26 | 云南大红山管道有限公司 | Urban groundwater drainage pipeline networks restorative procedure |
| CN110374140A (en) * | 2018-04-13 | 2019-10-25 | 上海管丽建设工程有限公司 | A kind of no-dig technique smear type inspection shaft restorative procedure |
| CN111577127A (en) * | 2020-05-16 | 2020-08-25 | 项英华 | Coal mine excavating device |
| CN113107067A (en) * | 2021-04-20 | 2021-07-13 | 江苏阔景建设工程有限公司 | Construction device and construction method for trenchless point-like repair of sewage pipeline |
| CN114754221A (en) * | 2022-04-07 | 2022-07-15 | 湖南大麓科技有限公司 | High-tensile-strength lining pipe and repairing method of CIPP pipeline |
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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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| CN109680782A (en) * | 2018-12-21 | 2019-04-26 | 云南大红山管道有限公司 | Urban groundwater drainage pipeline networks restorative procedure |
| CN111577127A (en) * | 2020-05-16 | 2020-08-25 | 项英华 | Coal mine excavating device |
| CN111577127B (en) * | 2020-05-16 | 2021-07-23 | 项英华 | Coal mine excavating device |
| CN113107067A (en) * | 2021-04-20 | 2021-07-13 | 江苏阔景建设工程有限公司 | Construction device and construction method for trenchless point-like repair of sewage pipeline |
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