CN111810216B - Vertical ventilation sleeve and construction method thereof - Google Patents
Vertical ventilation sleeve and construction method thereof Download PDFInfo
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- CN111810216B CN111810216B CN202010585736.5A CN202010585736A CN111810216B CN 111810216 B CN111810216 B CN 111810216B CN 202010585736 A CN202010585736 A CN 202010585736A CN 111810216 B CN111810216 B CN 111810216B
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- sleeve
- pipe
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
- E21F1/06—Duct connections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/04—Distributing means for power supply in mines
- E21F17/06—Distributing electric power; Cable networks; Conduits for cables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a vertical ventilation sleeve and a construction method of the ventilation sleeve, and relates to the technical field of mine ventilation. The ventilation sleeve pipe includes a plurality of thimble groups, and every thimble group includes dowel pipe and the sleeve pipe monomer more than 3, and the free internal diameter value of a plurality of sleeve pipes of the same group is the arithmetic progression, and the tolerance is the free pipe wall thickness value of sleeve pipe, is provided with 4 at least stock mounting holes on every sleeve pipe monomer, and the both sides in every stock hole are provided with the connection slotted hole of 2 at least bolts. When this ventilation sleeve pipe construction in the vertical, after the vertical drilling is accomplished, can prick in the vertical drilling and establish the reinforcing bar net, hoist in proper order and transfer the thimble group after the fixed shrink of spacer pin pipe, the outer sleeve pipe monomer that the diameter is the biggest is fixed with fixed surplus sleeve pipe monomer with organizing in proper order, beats and establishes the stock and strengthens fixedly, transfers the cable duct, and the concrete is filled. The ventilation sleeve and the construction method improve the installation efficiency of the vertical ventilation sleeve, can effectively prevent hole collapse in vertical shaft drilling, and ensure ventilation.
Description
Technical Field
The invention relates to the technical field of mine ventilation, in particular to a vertical ventilation sleeve and a construction method of the ventilation sleeve.
Background
The underground coal bunker of the coal mine is used as an underground chamber with main mine volume, can relieve the pressure during peak production in the transportation link, and stores coal in emergency. Particularly, along with the continuous improvement of the mechanized mining degree and the continuous realization of concentrated production in mining areas, the capacity of the ore bin is gradually increased, and the service efficiency is higher and higher. In the ventilation and cable equipment arrangement matched with the underground coal bunker, ventilation holes are generally constructed, the service life of the ventilation holes after construction is generally short, hole collapse is easy to occur, and the ventilation safety of the coal bunker chamber is influenced. In addition, because the cross section of the mine ventilation hole is small, the construction such as guniting in the ventilation hole is inconvenient; the length and the inclination angle of the vent hole are large, and the problems of difficult installation, trouble and labor waste and the like exist if the hole wall is protected by adopting a immersed tube mode. Therefore, the vertical ventilation sleeve and the construction method thereof need to be further improved, the service life of the ventilation holes is ensured, hole collapse accidents are avoided, and the safety is improved.
Disclosure of Invention
In order to improve the installation efficiency of the vertical ventilation sleeve, effectively prevent hole collapse of a vertical shaft drill hole and ensure ventilation, the invention provides the vertical ventilation sleeve and a construction method of the ventilation sleeve, and the specific technical scheme is as follows.
A vertical ventilation sleeve is arranged in a ventilation hole which is communicated with an upper port chamber and a lower port chamber of an underground coal bunker under a coal mine and is used for ventilation of the chambers and laying of cables, and comprises a plurality of sleeve groups, wherein each sleeve group comprises a positioning pin pipe and more than 3 sleeve monomers, the inner diameter values of the plurality of sleeve monomers in the same group are in an arithmetic progression, and the tolerance is the pipe wall thickness value of each sleeve monomer; each sleeve single body is provided with at least 4 anchor rod mounting holes, and two sides of each anchor rod hole are provided with at least 2 connecting slotted holes; the sleeve pipe groups are connected end to end in an extending state, and the end to end connection positions are fixedly connected with the slotted holes through bolts; a plurality of sleeve pipe monomers are sequentially accommodated in the outer layer sleeve pipe monomer with the largest diameter in the sleeve pipe group shrinkage state, and the positioning pin pipe is inserted into two opposite anchor rod mounting holes in the lower portion of the outer layer sleeve pipe monomer.
Preferably, the sleeve monomer is made of a steel plate, and the thickness of the steel plate is more than 5 mm; the length of each sleeve pipe monomer is larger than 1.5m, and the rotary type adjusting air windows are installed on the sleeve pipe monomers at the two ends of the vertical type ventilation sleeve pipe.
Preferably, 4 anchor rod holes are uniformly distributed along the pipe wall at the position which is less than 50mm away from the two ends of the sleeve single body, and 2 connecting slotted holes are respectively arranged on the two sides of each anchor rod hole; the outer diameter of the locating pin pipe is equal to the diameter of the anchor rod hole, the length of the locating pin pipe is larger than the diameter of any single sleeve pipe, and the locating pin pipe is repeatedly used in the installation process.
Preferably, a plurality of sleeve pipe sets are connected end to end after being stretched, and the joint of the two connected sleeve pipe sets is formed by connecting the outer sleeve pipe monomer and the inner sleeve pipe monomer.
A construction method of a vertical ventilation sleeve utilizes the vertical ventilation sleeve, and comprises the following steps:
a, constructing a vertical shaft borehole, and manufacturing a vertical ventilation sleeve;
b1, hoisting and lowering the sleeve pipe group in the contraction state of 1 group, inserting a positioning pin pipe into a connecting groove hole of the outer-layer sleeve pipe monomer, and fixing the outer-side sleeve pipe monomer by using an anchor rod;
c1, sequentially pushing up the sleeve monomers in the outer-layer sleeve monomer from outside to inside, gradually moving up the positioning pin pipe, welding and fixing the sleeve monomers after the sleeve monomers are connected end to end through bolts, and fixing each sleeve monomer through an anchor rod until all the sleeve monomers in the sleeve group are connected end to end;
d, repeating the step B1 and the step C1 until all ventilation sleeves are installed in the vertical shaft drill hole;
and E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drill hole and the ventilation sleeve.
A construction method of a vertical ventilation sleeve utilizes the vertical ventilation sleeve, and comprises the following steps:
a, constructing a vertical shaft borehole, and manufacturing a vertical ventilation sleeve;
b2, determining the length L of the sleeve pipe group in an extending state, hoisting and lowering the sleeve pipe group in a 1-group contracting state until the height of a drill hole is equal to L, inserting a positioning pin pipe into a connecting slotted hole at the lower part of an outer layer sleeve pipe monomer, lowering the sleeve pipe monomer of the sleeve pipe group, and fixing an inner layer sleeve pipe monomer by using an anchor rod;
and C2., sequentially lowering the casing single bodies in the outer casing single body from inside to outside, welding and fixing the casing single bodies after the casing single bodies are connected end to end through bolts, and fixing the casing single bodies through anchor rods until all the casing single bodies in the casing group are connected end to end.
D, repeating the step B2 and the step C2 until all ventilation sleeves are installed in the vertical shaft drill hole;
and E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drilling hole and the ventilation casing.
Further preferably, after the vertical shaft drilling construction, a reinforcing mesh is arranged in the vertical shaft drilling hole in a binding mode, and the reinforcing mesh is matched with the vertical ventilation sleeve for fixing.
Further preferably, the single casing pipe body is further provided with a limit stop at the connecting end to limit the maximum telescopic length of the adjacent single casing pipe bodies.
The vertical ventilation sleeve and the construction method of the ventilation sleeve have the advantages that: a plurality of thimble groups are installed in the ventilation hole that communicates port chamber about the coal bunker in the pit in the colliery, can be used for the chamber to ventilate and lay the cable, divide a plurality of thimble groups to install in addition and can improve the installation effectiveness and avoid hanging many times and put, through the fixed firm of having guaranteed the installation of stock hole and sleeve pipe monomer cooperation, vertical ventilation sleeve pipe simple structure, so convenient to use, reduce cost, nimble installation. The construction method of the vertical ventilation sleeve has the advantages of simple steps and high installation efficiency, avoids the risk of hole collapse, and prolongs the service life of the ventilation holes.
Drawings
FIG. 1 is a schematic view of a cannula assembly;
FIG. 2 is a schematic structural view of a single sleeve;
FIG. 3 is a schematic view of a vertical ventilation sleeve mounting arrangement;
FIG. 4 is a schematic top view of a vertical ventilation sleeve construction;
FIG. 5 is a schematic view of the vertical ventilation sleeve installation location;
in the figure:
a-a sleeve group; 1-single sleeve, 2-positioning pin pipe, 3-anchor rod, 4-connecting slotted hole, 5-anchor rod hole, 6-cable pipe, 7-vent hole and 8-concrete.
Detailed Description
A description will be given of a specific embodiment of a vertical ventilation duct and a method for constructing a ventilation duct according to the present invention with reference to fig. 1 to 5.
A vertical ventilation sleeve is arranged in a ventilation hole which is communicated with an upper port chamber and a lower port chamber of an underground coal bunker under a coal mine and is used for ventilation of the chambers and laying of cables. Generally, according to the relation between the upper opening and the lower opening of the coal bunker, a vent hole is arranged at a position which is not less than 2m away from the wall of the coal bunker. Vertical ventilation sleeve pipe includes a plurality of thimble groups, a plurality of thimble groups's total length generally is greater than 30m, every thimble group includes locating pin pipe and the sleeve pipe monomer more than 3, generally every thimble group extends state total length and is greater than 4m, with the free internal diameter value of a plurality of sleeve pipes of group for arithmetic progression, the maximum value of arithmetic progression is the free internal diameter of outer sleeve pipe, the number of the number that arithmetic progression contains is the free quantity of sleeve pipe, the tolerance of arithmetic progression is the free pipe wall thickness value of sleeve pipe, can be 5 mm. At least 4 anchor rod mounting holes are formed in each single sleeve and used for mounting anchor rods and positioning pin pipes, and at least 2 connecting slotted holes are formed in two sides of each anchor rod hole and used for connecting and fixing adjacent single sleeves. The sleeve pipe units are connected end to end in the extended state of the sleeve pipe group, and the end-to-end connection positions are fixedly connected with the slotted holes through bolts. A plurality of sleeve pipe monomers are accomodate in proper order in the biggest outer sleeve pipe monomer of diameter under the thimble group shrink state, and wherein the biggest sleeve pipe monomer of diameter is outer sleeve pipe monomer in every thimble group, and the dowel pipe is inserted in two relative anchor rod mounting holes in outer sleeve pipe monomer lower part, and the lower part is the part that lies in the below in vertical direction when the installation.
The single sleeve is made of a steel plate, the thickness of the steel plate is larger than 5mm, a 6mm steel plate can be rolled into a large steel pipe with the diameter of about 1m and the height of about 2.5m by using a plate rolling machine, and fixing holes are cut on the periphery of the steel plate, so that the steel plate can be conveniently fixed by bolts. The length of each sleeve monomer is larger than 1.5m, and the rotary type adjusting air windows are installed on the sleeve monomers at the two ends after the vertical type ventilation sleeve is installed. The sleeve pipe monomer is at the position less than 50mm apart from both ends and evenly arranges 4 anchor rod holes along the pipe wall, sets up 2 connection slotted holes respectively in the both sides in anchor rod hole. The external diameter of dowel pipe equals the diameter in anchor rod hole to the installation is dismantled to the convenience, and the length of dowel pipe is greater than the free diameter of arbitrary sleeve pipe, guarantees can spacing sleeve pipe group in the position relation between the sleeve pipe monomer, and the dowel pipe can used repeatedly in the installation, and the dowel pipe plays spacing effect through inserting between two relative anchor rod holes promptly to remaining sleeve pipe monomer, and can make things convenient for welded fixed. In addition, the connecting end of each single sleeve is also provided with a limit stop which can be arranged along the wall of each single sleeve to limit the maximum telescopic length of the adjacent single sleeves, so that the danger that the adjacent single sleeves are separated is avoided.
When the riser is installed, a plurality of sleeve pipe sets are generally used and connected end to end after being extended, and the joint of the two connected sleeve pipe sets is formed by connecting an outer sleeve pipe monomer and an inner sleeve pipe monomer, so that the riser can be installed in a ventilation drill hole with a large length.
A construction method of a vertical ventilation sleeve utilizes the vertical ventilation sleeve, and comprises the following steps:
and step A, constructing a vertical shaft borehole and manufacturing a vertical ventilation sleeve.
The construction of drilling the ventilation hole can adopt a large-aperture raise boring process, the guide hole adopts a wireless directional technology while drilling, and then a non-magnetic single-point inclination measuring down-the-hole hammer directional technology is used to complete the raise boring construction. After the vertical shaft drilling construction, a reinforcing mesh is arranged in the vertical shaft drilling hole in a binding mode, and the reinforcing mesh is matched with the vertical ventilation sleeve at the later stage for fixing.
And B1, hoisting and lowering the sleeve pipe group in the contraction state of the group 1, wherein the sleeve pipe group is in the contraction state so that the hoisting and the placement are convenient, and the positioning pin pipe is inserted into the connecting groove hole of the outer sleeve pipe monomer, so that the positions of other sleeve pipe monomers in the sleeve pipe group are limited, the outer sleeve pipe monomer is fixed by using the anchor rod, specifically, the anchor rod is arranged from the connecting groove hole, and the anchor rod and the outer sleeve pipe monomer are fixed.
And C1, sequentially pushing up the sleeve monomers in the outer-layer sleeve monomer from outside to inside, contracting the lifting rope to pull the inner sleeve monomers to move upwards, gradually moving the positioning pin pipe upwards, limiting each sleeve monomer moving upwards, welding and fixing the sleeve monomers after the sleeve monomers are connected end to end through bolts, and fixing the sleeve monomers through anchor rods until all the sleeve monomers in the sleeve group are connected end to end and welded and fixed. In addition, concrete can be poured immediately after each sleeve pipe set is installed, and the sleeve pipes are fixed, so that a bald cable pipe is required in advance.
And D, repeating the step B1 and the step C1, and determining the number of used sleeve sets according to the length of the ventilation holes until all the ventilation sleeves are installed in the vertical shaft drilling hole.
And E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drilling hole and the ventilation casing.
Another modification of the construction method of the vertical ventilation duct, which uses the above-described vertical ventilation duct, includes the steps of:
in the step A, a vertical shaft is constructed and drilled, and a vertical ventilation sleeve is manufactured; wherein the number of the casing groups and the length of each casing monomer are designed according to the length of the vertical shaft drilling.
In the step B2, the length L of the extension state of the sleeve pipe group is firstly determined, the sleeve pipe group under the contraction state of the lower group 1 is hoisted until the height of the drill hole is equal to the L, the positioning pin pipe is inserted into the connecting slotted hole at the lower part of the outer layer sleeve pipe monomer, other sleeve pipe monomers of the sleeve pipe group are lowered, the inner layer sleeve pipe monomer is arranged at the top, and the anchor rod is utilized to fix the inner layer sleeve pipe monomer.
And C2, sequentially lowering the casing monomers in the outer casing monomer from inside to outside, welding and fixing the casing monomers after the casing monomers are connected end to end through bolts, and fixing each casing monomer through an anchor rod until all the casing monomers in the casing group are connected end to end.
And D, repeating the step B2 and the step C2 until the ventilation sleeve is completely installed in the vertical shaft drilling hole.
And E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drill hole and the ventilation casing.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A construction method of a vertical ventilation sleeve utilizes a vertical ventilation sleeve, is arranged in a ventilation hole which is communicated with an upper port chamber and a lower port chamber of an underground coal bunker and is used for ventilation of the chambers and laying of cables, and comprises a plurality of sleeve groups, each sleeve group comprises a positioning pin pipe and more than 3 sleeve monomers, the inner diameter values of the plurality of sleeve monomers in the same group are in an arithmetic progression, and the tolerance is the pipe wall thickness value of the sleeve monomers; each sleeve single body is provided with at least 4 anchor rod mounting holes, and two sides of each anchor rod hole are provided with at least 2 connecting slotted holes; the sleeve pipe groups are connected end to end in an extending state, and the end to end connection positions are fixedly connected with the slotted holes through bolts; a plurality of sleeve pipe monomers are accomodate in proper order in the outer sleeve pipe monomer that the diameter is the biggest under the thimble group shrink state, and the dowel pipe is inserted in two relative anchor rod mounting holes in outer sleeve pipe monomer lower part, its characterized in that, the step includes:
step A, constructing a vertical shaft for drilling, and manufacturing a vertical ventilation sleeve;
b1, hoisting and lowering the sleeve pipe group in the contraction state of 1 group, inserting a positioning pin pipe into a connecting groove hole of the outer-layer sleeve pipe monomer, and fixing the outer-side sleeve pipe monomer by using an anchor rod;
c1, sequentially pushing up the sleeve monomers in the outer-layer sleeve monomer from outside to inside, gradually moving up the positioning pin pipe, welding and fixing the sleeve monomers after the sleeve monomers are connected end to end through bolts, and fixing each sleeve monomer through an anchor rod until all the sleeve monomers in the sleeve group are connected end to end;
d, repeating the step B1 and the step C1 until all ventilation sleeves are installed in the vertical shaft drill hole;
and E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drilling hole and the ventilation casing.
2. A construction method of a vertical ventilation sleeve utilizes a vertical ventilation sleeve, is arranged in a ventilation hole which is communicated with an upper port chamber and a lower port chamber of an underground coal bunker and is used for ventilation of the chambers and laying of cables, and comprises a plurality of sleeve groups, each sleeve group comprises a positioning pin pipe and more than 3 sleeve monomers, the inner diameter values of the plurality of sleeve monomers in the same group are in an arithmetic progression, and the tolerance is the pipe wall thickness value of the sleeve monomers; each sleeve single body is provided with at least 4 anchor rod mounting holes, and two sides of each anchor rod hole are provided with at least 2 connecting slotted holes; the sleeve pipe groups are connected end to end in an extending state, and the end to end connection positions are fixedly connected with the slotted holes through bolts; a plurality of sleeve pipe monomers are accomodate in proper order in the outer sleeve pipe monomer that the diameter is the biggest under the thimble group shrink state, and the dowel pipe is inserted in two relative anchor rod mounting holes in outer sleeve pipe monomer lower part, its characterized in that, the step includes:
step A, constructing a vertical shaft for drilling, and manufacturing a vertical ventilation sleeve;
b2, determining the length L of the extension state of the sleeve pipe group, hoisting and lowering the sleeve pipe group in the contraction state of 1 group until the height of the drilled hole is equal to L, inserting a positioning pin pipe into a connecting slotted hole at the lower part of the outer layer sleeve pipe monomer, lowering the sleeve pipe monomer of the sleeve pipe group, and fixing the inner layer sleeve pipe monomer by using an anchor rod;
c2. sequentially lowering the casing single bodies in the outer casing single body from inside to outside, welding and fixing the casing single bodies after the casing single bodies are connected end to end through bolts, and fixing each casing single body through an anchor rod until all casing single bodies in the casing group are connected end to end;
d, repeating the step B2 and the step C2 until all ventilation sleeves are installed in the vertical shaft drill hole;
and E, lowering the cable pipe, and pouring concrete between the hole wall of the vertical shaft drilling hole and the ventilation casing.
3. The construction method of the vertical ventilation sleeve according to claim 1 or 2, wherein the sleeve monomer is made of a steel plate, and the thickness of the steel plate is more than 5 mm; the length of each sleeve pipe monomer is larger than 1.5m, and the rotary type adjusting air windows are installed on the sleeve pipe monomers at the two ends of the vertical type ventilation sleeve pipe.
4. The construction method of the vertical ventilation sleeve according to claim 1 or 2, wherein 4 anchor rod holes are uniformly arranged along the pipe wall at the position less than 50mm away from the two ends of the sleeve single body, and 2 connecting slotted holes are respectively arranged on the two sides of each anchor rod hole; the outer diameter of the locating pin pipe is equal to the diameter of the anchor rod hole, the length of the locating pin pipe is larger than the diameter of any single sleeve pipe, and the locating pin pipe is repeatedly used in the installation process.
5. The method for constructing a vertical ventilation sleeve according to claim 1 or 2, wherein the plurality of sleeve sets are connected end to end after being extended, and the connection position of the two connected sleeve sets is that the outer sleeve monomer is connected with the inner sleeve monomer.
6. The method for constructing the vertical ventilation casing according to claim 2, wherein a steel mesh is tied in the vertical borehole after the vertical borehole is constructed, and the steel mesh is fixed in cooperation with the vertical ventilation casing.
7. The construction method of the vertical ventilation casing pipe as claimed in claim 2, wherein the casing pipe single bodies are further provided with limit stoppers at the connection ends to limit the maximum telescopic length of the adjacent casing pipe single bodies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585736.5A CN111810216B (en) | 2020-06-24 | 2020-06-24 | Vertical ventilation sleeve and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010585736.5A CN111810216B (en) | 2020-06-24 | 2020-06-24 | Vertical ventilation sleeve and construction method thereof |
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| Publication Number | Publication Date |
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| CN111810216A CN111810216A (en) | 2020-10-23 |
| CN111810216B true CN111810216B (en) | 2022-05-17 |
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| CN202010585736.5A Active CN111810216B (en) | 2020-06-24 | 2020-06-24 | Vertical ventilation sleeve and construction method thereof |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3147471A1 (en) * | 1981-12-01 | 1983-07-14 | Maschinenfabrik Korfmann Gmbh, 5810 Witten | Method and device for the suspension of an air duct system |
| CN2732997Y (en) * | 2004-08-27 | 2005-10-12 | 辽宁工程技术大学 | Telescopic air duct end device |
| CN106051345B (en) * | 2016-05-24 | 2018-01-02 | 北京建工环境修复股份有限公司 | A kind of pipeline and pipe-line system |
| CN206290260U (en) * | 2016-11-29 | 2017-06-30 | 金川集团股份有限公司 | A kind of reserved filling air return system air shaft in mine |
| CN207846999U (en) * | 2017-10-20 | 2018-09-11 | 中机国能电力工程有限公司 | A kind of air shaft of installation light pipe lighting system |
| CN210221060U (en) * | 2019-07-29 | 2020-03-31 | 江苏东交工程检测股份有限公司 | Buckle formula sedimentation pipe |
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2020
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