CN111720623A - Non-excavation lead-in pipe construction method - Google Patents

Non-excavation lead-in pipe construction method Download PDF

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Publication number
CN111720623A
CN111720623A CN202010643318.7A CN202010643318A CN111720623A CN 111720623 A CN111720623 A CN 111720623A CN 202010643318 A CN202010643318 A CN 202010643318A CN 111720623 A CN111720623 A CN 111720623A
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China
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pipe
flexible corrugated
gas
corrugated pipe
operator
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CN202010643318.7A
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Chinese (zh)
Inventor
吉世臣
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Hainan Future Engineering Design Co ltd
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Hainan Future Engineering Design Co ltd
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Priority to CN202010643318.7A priority Critical patent/CN111720623A/en
Publication of CN111720623A publication Critical patent/CN111720623A/en
Pending legal-status Critical Current

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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
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/02—Hose-clips

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)

Abstract

The invention discloses a construction method of a non-excavation lead-in pipe, which is based on a lead-in pipe assembly for gas conveying and is used for finishing normal conveying of gas in a building. This non-excavation service entrance pipe construction method, when changing old pipeline, need not carry out the large tracts of land excavation to ground, avoided causing the harm to ground in the building institute, the change loss has been reduced, it is efficient to change simultaneously, consuming time is short, operating personnel's working strength has been reduced, when pipeline takes place to leak in later stage simultaneously, can very convenient overhaul, when changing the pipeline, can make the slip of shuttling fast in old pipeline of new pipeline, thereby can be quick install new pipeline, the installation effectiveness of pipeline has been improved.

Description

Non-excavation lead-in pipe construction method
Technical Field
The invention relates to the technical field of pipeline laying, in particular to a construction method of a non-excavation leading-in pipe.
Background
The gas is the general term for gas fuel, and it can be burned to release heat for urban residents and industrial enterprises. The gas is widely applied to family life, the gas is widely applied to family life at present due to the technology of constructing pipelines in the current year and the use of pipes, the pipelines are laid underground, the laid buried pipelines enter the old age period, the traditional metal galvanized pipe lead-in pipe is perforated due to long-term corrosion, accidents frequently occur, casualties and property loss are caused, high attention must be paid to the fact, and the replacement of the pipeline is imperative.
The existing gas reconstruction engineering involves thousands of household engineering, when gas pipelines are replaced and reconstructed, the pipelines need to be completely excavated through the ground where the pipelines penetrate, but the pipelines are buried below household courtyards or public roads, so that great economic loss is caused when the pipelines are excavated, and meanwhile, the excavation work consumes time and labor, and the use of the gas is also influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a non-excavation introducing pipe construction method, which solves the problems of time and labor consumption and high construction cost in gas reconstruction.
In order to achieve the purpose, the invention is realized by the following technical scheme: a non-excavation introducing pipe construction method is based on a gas conveying introducing pipe assembly and is used for finishing normal conveying of gas in a building, the introducing pipe assembly comprises an old metal galvanized pipe and a flexible corrugated pipe, the flexible corrugated pipe is sleeved inside the old metal galvanized pipe, thread connecting sleeves are fixedly arranged at two ends of the flexible corrugated pipe, a thread block is connected to the inner thread of one thread connecting sleeve, a fixing rod is fixedly arranged at one side of the thread block, a rotating piece is fixedly arranged at one end of the fixing rod, rotating hemispheres are fixedly arranged on the front side and the back side of the rotating piece, a linkage rod is fixedly arranged at one side of the rotating piece, screw sleeves are fixedly arranged on the upper portion and the lower portion of two sides of the surface of the old metal galvanized pipe through connecting rods, screw rods are connected to the inner threads of the screw sleeves, and arc-shaped fixing plates are rotatably connected to the bottom, and the inside fixedly connected with slipmat of arc fixed plate.
Preferably, the trenchless introducing pipe construction method specifically comprises the following steps:
s1, according to the previous building design, the position of an old metal galvanized pipe and a buried joint of a main gas pipe in the building is confirmed, after the position is confirmed, the position is dug in a small range until the gas pipe and the main gas pipe are completely exposed, meanwhile, the position of a connecting valve of the connecting joint in the building is confirmed, and at the moment, a gas main valve on the main gas pipe can be closed;
s2, after the positions of the buried joint and the connecting valve of the old metal galvanized pipe and the main gas pipe are confirmed, measuring equipment is adopted, the distance between the two positions is measured accurately and is recorded as a construction distance, at the moment, a flexible corrugated pipe slightly longer than the construction distance can be selected, the inner diameter of the old metal galvanized pipe is measured, then a flexible corrugated pipe with a proper inner diameter is selected according to the inner diameter of the old metal galvanized pipe, and after the flexible corrugated pipe is selected, an operator can rotate a thread block into a threaded connecting sleeve, so that the installation of a rotating hemisphere is completed;
s3, an operator can select an iron wire far longer than the construction distance, the iron wire is led to the position of a connecting valve from the position of a joint, after the iron wire is threaded, the operator can wind one end, located at the position of the joint, of the iron wire on a linkage rod, the operator can place two rotating hemispheres into an old metal galvanized pipe at the moment, the operator located at the position of the connecting valve can pull the iron wire at the moment, the iron wire can drive a flexible corrugated pipe to enter the old metal galvanized pipe through the rotating hemispheres, a thread connecting sleeve and a thread block, after one end of the flexible corrugated pipe penetrates out of the position of the connecting valve, the operator can reversely rotate the thread block at the moment, and therefore the rotating hemispheres and the linkage rod are taken down;
s4, after one end of the flexible corrugated pipe penetrates out of the position of the connecting valve, an operator can hermetically connect the port of the flexible corrugated pipe with the port of the connecting valve and simultaneously connect the other port of the flexible corrugated pipe with the port of the main gas pipe;
s5, after the two ports of the flexible corrugated pipe are connected, an operator can rotate the screw rod, so that the flexible corrugated pipe is fixed through the arc-shaped fixing plate and the anti-slip mat, and the installation of the flexible corrugated pipe is completed;
s6, after the flexible corrugated pipe is fixedly installed, an operator can open the gas main valve to normally open the gas, after a period of time, the operator can use a gas detector to detect two ends of the old metal galvanized pipe, if no gas leaks, the pipeline is laid safely, and at the moment, the previously dug operation pit is filled and leveled, so that the pipeline is led in and laid.
Preferably, in the step S2, the flexible corrugated pipe is slightly smaller than the inner diameter of the old galvanized metal pipe.
Preferably, the length of the iron wire in the step S3 is at least 2 times of the construction distance.
Preferably, the gas leakage detection can be performed only after the gas is normally opened and then needs to be left for at least 3 hours in step S6.
Advantageous effects
The invention provides a construction method of a trenchless lead-in pipe. Compared with the prior art, the method has the following beneficial effects:
(1) the non-excavation lead-in pipe construction method comprises the steps of confirming the buried joint position of an old metal galvanized pipe and a main gas pipe in a building according to previous building design through S1, digging the position in a small range after the position is determined, S2, after the buried joint position of the old metal galvanized pipe and the main gas pipe and the position of a connecting valve are confirmed, adopting measuring equipment, finely measuring the distance between the two positions and recording the distance as a construction distance, S4, after one end of a flexible corrugated pipe penetrates out of the position of the connecting valve, an operator can hermetically connect the port of the flexible corrugated pipe with the port of the connecting valve, simultaneously connect the other port of the flexible corrugated pipe with the port of the main gas pipe, when old pipelines are replaced, excavation on the ground is not needed, damage to the ground in a building yard is avoided, and replacement loss is reduced, meanwhile, the replacement efficiency is high, the time consumption is short, the working strength of operators is reduced, and meanwhile, when the pipeline leaks in the later period, the pipeline can be very conveniently overhauled.
(2) This non-excavation inlet tube construction method, through S3, operating personnel can select the far from being good at construction distance iron wire, lead to the connecting valve position with the iron wire from the joint position, treat after the iron wire wears, operating personnel can be located the one end winding that the iron wire connects the position on the gangbar, operating personnel can put into old metal galvanized pipe with two rotation hemispheres this moment, the staff who is located connecting valve position this moment can stimulate the iron wire, the iron wire can be through rotating the hemisphere, threaded connection cover and thread piece drive flexible bellows and get into in old metal galvanized pipe, treat after the one end of flexible bellows worn out the connecting valve position can, when changing the pipeline, can make the new pipeline slide that shuttles back and forth in old pipeline fast, thereby can be quick install the new pipeline, the installation effectiveness of pipeline has been improved.
(3) The non-excavation lead-in pipe construction method comprises the steps that a fixed rod is fixedly installed on one side of a thread block, a rotating piece is fixedly installed at one end of the fixed rod, rotating hemispheres are fixedly installed on the front face and the back face of the rotating piece respectively, a linkage rod is fixedly installed on one side of the rotating piece, screw sleeves are fixedly installed on the upper portion and the lower portion of two sides of the surface of an old metal galvanized pipe through connecting rods, screw rods are connected to the screw sleeves in a threaded mode, the bottom ends of the screw rods are rotatably connected with an arc-shaped fixed plate through bearings, anti-slip pads are fixedly connected to the inside of the arc-shaped fixed plate, S5, after two ports of a flexible corrugated pipe are connected, an operator can rotate the screw rods, the flexible corrugated pipe is fixed through the arc-shaped fixed plate and the anti-slip pads, installation of the, the normal operation of gas conveying is guaranteed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the fixed bar, rotating hemisphere and linkage bar arrangement of the present invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 1;
fig. 4 is a side view of the arcuate securing plate and cleat configuration of the present invention.
In the figure: 1. an intake tube assembly; 2. old metal galvanized pipe; 3. a flexible bellows; 4. a threaded connecting sleeve; 5. a thread block; 6. fixing the rod; 7. a rotating member; 8. rotating the hemisphere; 9. a linkage rod; 10. a screw sleeve; 11. a screw shaft; 12. an arc-shaped fixing plate; 13. a non-slip mat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a non-excavation lead-in pipe construction method is based on a lead-in pipe assembly 1 for gas conveying and is used for finishing normal conveying of gas in a building, the lead-in pipe assembly 1 comprises an old metal galvanized pipe 2 and a flexible corrugated pipe 3, the flexible corrugated pipe 3 can be bent well, the flexible corrugated pipe 3 is sleeved inside the old metal galvanized pipe 2, both ends of the flexible corrugated pipe 3 are fixedly provided with thread connecting sleeves 4, the inner thread of one thread connecting sleeve 4 is connected with a thread block 5, one side of the thread block 5 is fixedly provided with a fixed rod 6, one end of the fixed rod 6 is fixedly provided with a rotating piece 7, the front surface and the back surface of the rotating piece 7 are fixedly provided with rotating hemispheres 8, one side of the rotating piece 7 is fixedly provided with a linkage rod 9, and the upper part and the lower part of both sides of the surface of the old metal, the inside threaded connection of the turnbuckle 10 has the lead screw 11 to the bottom of lead screw 11 is rotated through the bearing and is connected with arc fixed plate 12, and the inside fixedly connected with slipmat 13 of arc fixed plate 12, slipmat 13 are the rubber material.
In the invention, the construction method of the trenchless lead-in pipe specifically comprises the following steps:
s1, according to the previous building design, the positions of the old metal galvanized pipe 2 and the buried joint of the main gas transmission pipe in the building are confirmed, after the positions are confirmed, the positions are dug in a small range until the gas transmission pipe and the main gas transmission pipe are completely exposed, meanwhile, the position of a connecting valve of the connecting joint in the building is confirmed, and at the moment, a gas main valve on the main gas transmission pipe can be closed;
s2, after the positions of the buried joint and the position of the connecting valve of the old metal galvanized pipe 2 and the main gas pipe are confirmed, measuring the distance between the two positions by using measuring equipment, recording the distance as a construction distance, selecting a flexible corrugated pipe 3 slightly longer than the construction distance at the moment, measuring the inner diameter of the old metal galvanized pipe 2, selecting a flexible corrugated pipe 3 with a proper inner diameter according to the inner diameter of the old metal galvanized pipe 2, and after the flexible corrugated pipe 3 is selected, an operator can rotate the thread block 5 into the thread connecting sleeve 4, so that the installation of the rotating hemisphere 8 is completed;
s3, an operator can select an iron wire far longer than the construction distance, the iron wire is led to the position of a connecting valve from the position of a joint, after the iron wire is threaded, the operator can wind one end, located at the position of the joint, of the iron wire on a linkage rod 9, the operator can place two rotating hemispheres 8 into an old metal galvanized pipe 2 at the moment, the operator located at the position of the connecting valve can pull the iron wire at the moment, the iron wire can drive a flexible corrugated pipe 3 to enter the old metal galvanized pipe 2 through the rotating hemispheres 8, a threaded connecting sleeve 4 and a threaded block 5, after one end of the flexible corrugated pipe 3 penetrates out of the position of the connecting valve, the operator can reversely rotate the threaded block 5 at the moment, and therefore the rotating hemispheres 8 and the linkage rod 9 can be taken down;
s4, after one end of the flexible corrugated pipe 3 penetrates out of the position of the connecting valve, an operator can hermetically connect the port of the flexible corrugated pipe 3 with the port of the connecting valve, and simultaneously connect the other port of the flexible corrugated pipe 3 with the port of the main gas pipe, and a rubber sealing ring is required to be used for sealing when the connection is carried out;
s5, after the two ports of the flexible corrugated pipe 3 are connected, an operator can rotate the screw rod 11, so that the flexible corrugated pipe 3 is fixed through the arc-shaped fixing plate 12 and the anti-skid pad 13, and the installation of the flexible corrugated pipe 3 is completed;
s6, after the flexible corrugated pipe 3 is fixedly installed, an operator can open the gas main valve to normally open the gas, after a period of time, the operator can use a gas detector to detect the two ends of the old metal galvanized pipe 2, if no gas leaks, the pipeline is laid safely, and at the moment, the previously dug operation pit is filled and leveled, so that the pipeline is led in and laid.
When overhauing, confirm that old metal galvanized pipe 2 buries ground with main gas-supply pipe in this building and connect the position, confirm this position after, carry out the miniwatt with this position and dig and get, but reverse rotation lead screw 11 this moment for arc fixed plate 12 separates with flexible bellows 3 completely, with the connection port after-separating, can take out flexible bellows 3, overhauls.
In the present invention, in step S2, the flexible corrugated tube 3 is slightly smaller than the inner diameter of the old metal galvanized tube 2.
In the present invention, the length of the iron wire in step S3 is at least 2 times the working distance.
In the invention, the gas leakage detection can be carried out only after the gas is normally opened and is required to be kept stand for at least 3 hours in step S6.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A non-excavation inlet pipe construction method is based on an inlet pipe assembly (1) for gas conveying and is used for finishing normal conveying of gas in a building, and is characterized in that: the lead-in pipe assembly (1) comprises an old metal galvanized pipe (2) and a flexible corrugated pipe (3), the flexible corrugated pipe (3) is sleeved inside the old metal galvanized pipe (2), threaded connecting sleeves (4) are fixedly mounted at the two ends of the flexible corrugated pipe (3), a threaded block (5) is connected with the internal thread of one of the threaded connecting sleeves (4), a fixed rod (6) is fixedly mounted at one side of the threaded block (5), a rotating piece (7) is fixedly mounted at one end of the fixed rod (6), a rotating hemisphere (8) is fixedly mounted at the front side and the back side of the rotating piece (7), a linkage rod (9) is fixedly mounted at one side of the rotating piece (7), a screw sleeve (10) is fixedly mounted at the upper part and the lower part of the two sides of the surface of the old metal galvanized pipe (2) through connecting rods, and a screw rod (11) is connected with the internal thread, and the bottom end of the lead screw (11) is rotatably connected with an arc-shaped fixing plate (12) through a bearing, and the inner part of the arc-shaped fixing plate (12) is fixedly connected with an anti-skid pad (13).
2. The trenchless lead-in pipe construction method of claim 1, wherein: the method specifically comprises the following steps:
s1, according to the previous building design, the positions of an old metal galvanized pipe (2) and a buried joint of a main gas transmission pipe in the building are confirmed, after the positions are confirmed, the positions are dug in a small range until the gas transmission pipe and the main gas transmission pipe are completely exposed, meanwhile, the position of a connecting valve of the connecting joint in the building is confirmed, and at the moment, a gas main valve on the main gas transmission pipe can be closed;
s2, after the positions of the old metal galvanized pipe (2) and the buried joint of the main gas pipe and the position of the connecting valve are confirmed, after measuring equipment is adopted, the distance between the two positions is measured accurately and recorded as a construction distance, at the moment, a flexible corrugated pipe (3) slightly longer than the construction distance can be selected, the inner diameter of the old metal galvanized pipe (2) is measured, then the flexible corrugated pipe (3) with the proper inner diameter is selected according to the inner diameter of the old metal galvanized pipe (2), and after the flexible corrugated pipe (3) is selected, an operator can rotate the thread block (5) into the thread connecting sleeve (4), so that the installation of the rotating hemisphere (8) is completed;
s3, an operator can select an iron wire far longer than the construction distance, the iron wire is led to the position of a connecting valve from the position of a joint, after the iron wire is threaded, the operator can wind one end, located at the position of the joint, of the iron wire on a linkage rod (9), the operator can place two rotating hemispheres (8) into an old metal galvanized pipe (2), the operator located at the position of the connecting valve can pull the iron wire, the iron wire can drive a flexible corrugated pipe (3) to enter the old metal galvanized pipe (2) through the rotating hemispheres (8), a thread connecting sleeve (4) and a thread block (5), one end of the flexible corrugated pipe (3) penetrates out of the position of the connecting valve, the operator can reversely rotate the thread block (5), and the rotating hemispheres (8) and the linkage rod (9) are taken down;
s4, after one end of the flexible corrugated pipe (3) penetrates out of the position of the connecting valve, an operator can hermetically connect the port of the flexible corrugated pipe (3) with the port of the connecting valve and simultaneously connect the other port of the flexible corrugated pipe (3) with the port of the main gas pipe;
s5, after the two ports of the flexible corrugated pipe (3) are connected, an operator can rotate the screw rod (11), so that the flexible corrugated pipe (3) is fixed through the arc-shaped fixing plate (12) and the anti-skid pad (13), and the installation of the flexible corrugated pipe (3) is completed;
s6, after the flexible corrugated pipe (3) is fixedly installed, an operator can open the gas main valve to normally open the gas, after a period of time, the operator can use a gas detector to detect the two ends of the old metal galvanized pipe (2), if no gas leaks, the pipeline is laid safely, and at the moment, an operation pit dug before is filled and leveled, so that the pipeline is led in and laid.
3. The trenchless lead-in pipe construction method of claim 2, wherein: in the step S2, the inner diameter of the flexible corrugated pipe (3) is slightly smaller than that of the old metal galvanized pipe (2).
4. The trenchless lead-in pipe construction method of claim 2, wherein: in the step S3, the length of the iron wire is at least 2 times of the construction distance.
5. The trenchless lead-in pipe construction method of claim 2, wherein: and in the step S6, the gas leakage detection can be carried out only after the gas is normally opened and then is required to be stood for at least 3 hours.
CN202010643318.7A 2020-07-07 2020-07-07 Non-excavation lead-in pipe construction method Pending CN111720623A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010643318.7A CN111720623A (en) 2020-07-07 2020-07-07 Non-excavation lead-in pipe construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010643318.7A CN111720623A (en) 2020-07-07 2020-07-07 Non-excavation lead-in pipe construction method

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Publication Number Publication Date
CN111720623A true CN111720623A (en) 2020-09-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053480A1 (en) * 1980-12-02 1982-06-09 British Gas plc Improvements in the replacement of mains
CN2219998Y (en) * 1995-03-17 1996-02-14 李红 Underground hole-enlarging device
CN102313077A (en) * 2011-08-29 2012-01-11 长春高祥特种管道有限公司 Non-digging pipeline introduction construction method
CN103527848A (en) * 2013-11-01 2014-01-22 浙江富浩管业有限公司 Drawing head for dragging construction of ultra-large-diameter poly ethylene (PE) pipe
CN108361463A (en) * 2017-12-18 2018-08-03 湖北鑫麒麟管业有限公司 A kind of telescopic PE pipes for building

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0053480A1 (en) * 1980-12-02 1982-06-09 British Gas plc Improvements in the replacement of mains
CN2219998Y (en) * 1995-03-17 1996-02-14 李红 Underground hole-enlarging device
CN102313077A (en) * 2011-08-29 2012-01-11 长春高祥特种管道有限公司 Non-digging pipeline introduction construction method
CN103527848A (en) * 2013-11-01 2014-01-22 浙江富浩管业有限公司 Drawing head for dragging construction of ultra-large-diameter poly ethylene (PE) pipe
CN108361463A (en) * 2017-12-18 2018-08-03 湖北鑫麒麟管业有限公司 A kind of telescopic PE pipes for building

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Application publication date: 20200929