CN113294160A - Novel pipe jacking construction retaining device suitable for high water pressure and stratum with strong water permeability - Google Patents
Novel pipe jacking construction retaining device suitable for high water pressure and stratum with strong water permeability Download PDFInfo
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- CN113294160A CN113294160A CN202110645826.3A CN202110645826A CN113294160A CN 113294160 A CN113294160 A CN 113294160A CN 202110645826 A CN202110645826 A CN 202110645826A CN 113294160 A CN113294160 A CN 113294160A
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- water
- pipe
- retaining device
- pipe jacking
- bolt
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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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
- Y02E10/20—Hydro energy
Abstract
The invention discloses a novel pipe-jacking construction retaining device suitable for a stratum with high water pressure and strong water permeability, which comprises a working well and a pipe-jacking body, wherein the side wall of the working well is provided with a construction opening matched with the pipe-jacking body, a plurality of first fixing bolts are circumferentially distributed around the construction opening, and each first fixing bolt is rotatably connected with a first threaded barrel through threads. The pipe jacking device has the advantages that clamping force can be applied to the jacking pipe from the outside of the pipe jacking body through the first clamping device, and clamping force can be applied from the inside of the pipe jacking body through the second clamping device, so that the contact area between the whole retaining device and the pipe jacking body is larger, the static friction force between the pipe jacking body and the retaining device is enlarged, the whole retaining device can effectively fix the pipe jacking body, meanwhile, the force applied by the first clamping device and the force applied by the second clamping device can act on the pipe jacking body in equal and opposite directions, and the pipe jacking body cannot have a deformation tendency.
Description
Technical Field
The invention relates to the technical field of pipe jacking construction, in particular to a novel pipe jacking construction retaining device suitable for a stratum with high water pressure and strong water permeability.
Background
Along with the development of cities, urban land resources are more and more scarce, and urban construction also depends on the development of underground spaces. The application of the pipe jacking technology plays an important role in urban pipeline construction. With the development of large-scale pipe jacking technology, the pipe jacking technology has become an important construction mode for arrangement of urban pedestrian passageways and the like. However, the pipe jacking is underground engineering, the pipe jacking is usually buried deeply in the construction process, and the soil pressure on the front side is high due to high underground water level and weak soil layer in southern areas such as Shanghai and the like. In the initial stage of pipe jacking construction, the side frictional resistance borne by the pipe jacking construction is far smaller than the front soil pressure, and the front soil pressure can be balanced only by applying jacking force on the tail part of the pipe jacking. However, due to the characteristics of pipe jacking construction, when the pipe jacking section is increased, the jack applying jacking force at the tail of the pipe jacking must be retracted, so that the jacking force is removed. In order to ensure that the pushed pipe joint does not retract, a pipe-jacking stopping device or measure is needed to prevent the pipe joint from retreating.
At present, two measures are mainly adopted for preventing the push pipe from returning, the first measure is that pre-buried steel plates are respectively arranged on the wall of an originating well around the push pipe and at the position of a pipe joint of the push pipe, and when a jack needs to be retracted in order to increase the pipe joint of the push pipe, a connecting steel plate is welded on the pre-buried steel plates on the wall of the originating well and the pre-buried steel plates on the pipe joint, so that the wall of the originating well and the pipe joint are connected into a whole. The retaining method needs to weld the connecting steel plates, and is complex in operation and time-consuming.
The second measure solves the problems of complex operation and much consumed time in the first measure to a certain extent, the second measure is to manufacture a special retaining device, an opening is reserved on a pipe piece of the jacking pipe, when a jack needs to be retracted in order to increase the pipe section of the jacking pipe, one end of a retaining pin is fixed on the retaining device, and the other end of the retaining pin is inserted into the opening reserved in the pipe section, so that the purpose of retaining is achieved. But the second measure needs to reserve the stopping pin entrance to a cave on the pipe-jacking piece, and the opening of the stopping pin entrance to the pipe-jacking piece can cause the area around the stopping pin entrance to produce great concentrated stress, resulting in the pipe-jacking to break.
Thereby offset through polylith arc and tube coupling for not holing the tube coupling among the prior art, prevent the tube coupling from backing up through frictional force, nevertheless can make the area of contact of offset plate and tube coupling bigger for increase frictional force under the stratum of high water pressure, but for can offset with not unidimensional tube coupling, the offset plate can not wrap up the tube coupling completely, lead to the frictional force between offset plate and the tube coupling to be not enough to balance the dynamics that the tube coupling backed up, and the offset plate installation among the prior art is dismantled very troublesome, be not convenient for constructor uses, reduce the efficiency of construction.
Therefore, a novel pipe jacking construction retaining device suitable for a stratum with high water pressure and strong water permeability is provided to solve the problems.
Disclosure of Invention
The invention aims to solve the problems of insufficient friction force between a supporting plate and a pipe joint, inconvenience in installation of the supporting plate and the like in the prior art, and provides a novel pipe jacking construction retaining device suitable for a stratum with high water pressure and strong water permeability.
In order to achieve the purpose, the invention adopts the following technical scheme:
the novel pipe-jacking construction retaining device is suitable for the stratum with high water pressure and strong water permeability and comprises a plurality of groups of first expansion pieces distributed along the circumferential direction of a construction opening; a second telescoping member; each group of first telescopic pieces is respectively provided with a first clamping device for clamping the pipe jacking body; the first clamping device includes: the push pipe comprises a fixed rod connected with the first telescopic piece, a first bolt in threaded connection with the fixed rod, an adjusting piece used for driving the first bolt, and a first abutting piece connected with the first bolt and used for contacting with the push pipe body.
Preferably, the second clamping device includes: the rotating rod is rotatably connected with the second telescopic piece, the sleeve is rotatably connected with one end, far away from the second telescopic piece, of the rotating rod, the bevel gear is connected with the sleeve, the fixing sleeve is rotatably connected with the sleeve, and the fixing sleeve is provided with a bevel gear ring matched with the bevel gear, a third screw matched with the bevel gear and a second abutting piece connected with the third screw.
Preferably, a protecting sleeve is connected to the sleeve, and the protecting sleeve is in threaded connection with the third screw; the third screw is in transmission connection with the bevel gear through a square rod.
Preferably, the first telescopic member comprises: the first threaded rod is connected with the first clamping device; the direction of the threads on the surface of the first threaded rod is opposite to the direction of the threads on the surface of the first fixing bolt.
Preferably, the second telescopic member comprises: the second fixing bolt and a second threaded rod connected with the second fixing bolt through a second threaded cylinder, and a second clamping device is arranged at one end, far away from the second threaded cylinder, of the second threaded rod.
Preferably, the regulating part includes with first bolt deviates from first gear that the one end of first butt piece is connected, with the gear post that the dead lever rotated and is connected, the gear post with individual first gear matches, and with the first handle of rotating that the gear post is connected.
Preferably, one end of each third threaded rod, which is close to the square rod, is fixedly connected with a sliding block; the sliding blocks are connected with the fixed sleeves in a sliding mode.
Preferably, one end of each fixing rod, which is far away from the first threaded rod, is fixedly connected with a resisting block through a second bolt; the plurality of abutting blocks are used for abutting against the top pipe body.
Preferably, the first pressing plate is connected with the first bolt, and the first abutting plate is connected with one end, far away from the first bolt, of the first pressing plate.
Preferably, the second fixing bolt is arranged on the side wall of the working well far away from the first fixing bolt and close to the position opposite to the center of the construction opening.
Compared with the prior art, the invention has the beneficial effects that:
1. the clamping force can be applied to the jacking pipe from the outside of the jacking pipe body through the first clamping device, and the clamping force can be applied from the inside of the jacking pipe body through the second clamping device, so that the contact area between the whole retaining device and the jacking pipe body is larger, the static friction force between the jacking pipe body and the retaining device is enlarged, the whole retaining device can effectively fix the jacking pipe body, meanwhile, the force applied by the first clamping device and the second clamping device can act on the jacking pipe body in an equal and reverse direction, the trend of deformation of the jacking pipe body is avoided, and the static friction force is increased by increasing the contact area between the whole retaining device and the jacking pipe body, so that the working strength of the whole retaining device can be kept from being too high, and the service life of the retaining device is prolonged;
2. can drive a plurality of first gear rotations simultaneously through the gear post to this makes first support the board and moves down to support the push pipe body, can improve staff's installation rate, and then improves the efficiency of construction, through a plurality of pieces of supporting, can support the push pipe body in advance, prevents that the push pipe body from falling back, so that carry out second clamping device's installation, a plurality of pieces of supporting can be dismantled, conveniently increase the tube coupling, can support the lag through the slider, avoid third threaded rod roll-off lag.
Drawings
FIG. 1 is a schematic structural diagram of a novel pipe jacking construction retaining device suitable for a high-water-pressure and high-water-permeability stratum provided by the invention;
FIG. 2 is a schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural view of a supporting plate, a gear and other structures of the novel pipe jacking construction retaining device suitable for a high-water-pressure and high-water-permeability stratum provided by the invention;
FIG. 4 is a schematic structural view of a second clamping device and the like of the novel pipe jacking construction retaining device suitable for the stratum with high water pressure and strong water permeability;
fig. 5 is a schematic structural diagram at B in fig. 4.
In the figure: 1 working well, 2 push pipe bodies, 3 first fixing bolts, 4 second fixing bolts, 5 first thread cylinders, 6 first threaded rods, 7 fixing pads, 8 fixing rods, 9 first bolts, 10 first pressing plates, 11 first abutting plates, 12 first gears, 13 gear columns, 14 first rotating handles, 15 second thread cylinders, 16 second rotating handles, 17 rotating rods, 18 second threaded rods, 19 sleeves, 20 fixing sleeves, 21 bevel gears, 22 bevel gear rings, 23 square rods, 24 third threaded rods, 25 protecting sleeves, 26 second pressing plates, 27 second abutting plates and 28 abutting blocks.
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.
Referring to fig. 1-5, a novel pipe-jacking construction retaining device suitable for a high-water-pressure and high-water-permeability stratum comprises a working well 1 and a pipe-jacking body 2, wherein a construction opening matched with the pipe-jacking body 2 is formed in the side wall of the working well 1, a plurality of first fixing bolts 3 are circumferentially distributed around the construction opening, each first fixing bolt 3 is rotatably connected with a first threaded cylinder 5 through threads, one end of each first threaded cylinder 5, far away from the first fixing bolt 3, is rotatably connected with a first threaded rod 6 through threads, the direction of the threads of the first threaded rod 6 and the first fixing bolt 3 is opposite, one end of each first threaded rod 6, far away from the first threaded cylinder 5, is fixedly connected with a first clamping device, a second fixing bolt 4 is fixedly connected to the position, close to the center of the construction opening, of the side wall of the working well 1, far away from the first fixing bolt 3, and the second fixing bolt 4 is rotatably connected with a second threaded cylinder 15 through threads, one end of the second threaded cylinder 15, which is far away from the second fixing bolt 4, is rotatably connected with a second threaded rod 18 through threads, and one end of the second threaded rod 18, which is far away from the second threaded cylinder 15, is provided with a second clamping device;
the clamping force can be applied to the jacking pipe from the outside of the jacking pipe body 2 through the first clamping device, and the clamping force can be applied from the inside of the jacking pipe body 2 through the second clamping device, so that the contact area between the whole retaining device and the jacking pipe body 2 is larger, the static friction force between the jacking pipe body 2 and the retaining device is enlarged, the whole retaining device can effectively fix the jacking pipe body, meanwhile, the force applied by the first clamping device and the second clamping device can act on the jacking pipe body 2 in an equal and reverse direction, the jacking pipe body 2 cannot have a deformation tendency, and the static friction force is increased by increasing the contact area with the jacking pipe body 2 through the whole retaining device, so that the working strength of the whole retaining device can be kept from being too high, and the service life of the retaining device is prolonged;
each first clamping device comprises a fixed rod 8, the fixed rod 8 is fixedly connected with a first threaded rod 6, the side wall of the fixed rod 8 is fixedly connected with a plurality of fixed cushions 7, each fixed cushion 7 is provided with a plurality of threaded holes, each first threaded hole is connected with a first bolt 9 through threaded rotation, a plurality of first bolts 9 are fixedly connected with a plurality of first pressing plates 10, one sections of the plurality of first pressing plates 10 far away from the first bolts 9 are fixedly connected with first abutting plates 11, one end of each first bolt 9 far away from the first pressing plate 10 is fixedly connected with a first gear 12, the side wall of the fixed rod 8 far away from the first abutting plates 11 is rotatably connected with gear columns 13 matched with the plurality of first gears 12, one end of each gear column 13 far away from the fixed rod 8 is fixedly connected with a first rotating handle 14, one end of each fixed rod 8 far away from the first threaded rod 6 is fixedly connected with an abutting block 28 through a second bolt, the plurality of abutting blocks 28 abut against the top pipe body 2;
the second clamping device comprises a rotating rod 17, the rotating rod 17 is rotatably connected with a second threaded rod 18 through a second rotating handle 16, one end of the rotating rod 17, far away from the second threaded rod 18, is rotatably connected with a sleeve 19, the side wall of the sleeve 19 is rotatably connected with a plurality of bevel gears 21, one end of the rotating rod 17, near the sleeve 19, is fixedly connected with a plurality of fixing sleeves 20, the plurality of fixing sleeves 20 are rotatably connected with the sleeve 19, one end of each fixing sleeve 20, near the bevel gear 21, is fixedly connected with a bevel gear ring 22 matched with the bevel gear 21, the side wall of each bevel gear 21, far away from the sleeve 19, is fixedly connected with a square rod 23, each square rod 23 is slidably connected with a third threaded rod 24 through a square groove, the side wall of the sleeve 19, near the plurality of bevel gears 21, is fixedly connected with a plurality of protecting sleeves 25, the plurality of protecting sleeves 25 are rotatably connected with the plurality of third threaded rods 24 through threads, and one end of the plurality of the third threaded rods 24, far away from the square rod 23, is fixedly connected with a second pressing plate 26, one ends of the second pressing plates 26 far away from the third threaded rods 24 are fixedly connected with second resisting plates 27, one end of each third threaded rod 24 close to the square rod 23 is fixedly connected with a sliding block, and the sliding blocks are in sliding connection with the fixed sleeves 20;
can drive a plurality of first gears 12 simultaneously through gear post 13 and rotate to this makes first abutting plate 11 move down and supports push pipe body 2, can improve staff's installation rate, and then improve the efficiency of construction, through a plurality of pieces 28 of supporting, can support push pipe body 2 in advance, prevent that push pipe body 2 from falling back, so as to carry out second clamping device's installation, a plurality of pieces 28 of supporting can be dismantled, conveniently increase the tube coupling, can support lag 25 through the slider, avoid third threaded rod 24 roll-off lag 25.
In the present invention, the first extensible member includes: first fixing bolt 3, first threaded rod 6. The second telescoping member includes: a second fixing bolt 4 and a second threaded rod 18. The first abutment comprises: a first pressing plate 10 and a first abutting plate 11. The second abutment comprises: a second pressing plate 26 and a second abutting plate 27.
When the invention is used, a plurality of first clamping devices are connected with a plurality of first fixing bolts 3 through a first threaded cylinder 5, the position where a plurality of first abutting plates 11 abut against a top pipe body 2 is adjusted through the first threaded cylinder 5, at the moment, a plurality of abutting blocks 28 firmly abut against the top pipe body 2, after the connection is finished, a first rotating handle 14 is rotated, the first rotating handle 14 drives a gear column 13 to rotate so as to drive a plurality of first gears 12 to rotate, the plurality of first gears 12 drive a first bolt 9 to rotate, so that the first bolt 9 can gradually move, the plurality of first gears 12 can slide on the gear column 13 and can not be disengaged, the plurality of first bolts 9 press the first abutting plates 11 through a first pressing plate 10 to be close to the top pipe body 2, so as to firmly abut the first abutting plates 11 against the outer side wall of the top pipe body 2, at the moment, the top pipe body 2 is preliminarily fixed, a jack is removed to install a pipe joint, the second clamping device is installed after the pipe joint is opposite to the pipe jacking body 2;
the second clamping device is opposite to the plurality of first clamping devices from the inside of the fixed pipe by adjusting the position of the second threaded cylinder 15, the second abutting plates 27 are fixed after the adjustment is finished, the second rotating handle 16 is rotated, the rotating rod 17 is driven to rotate by rotating the second rotating handle 16, the rotating rod 17 drives the plurality of fixing sleeves 20 to rotate, the plurality of fixing sleeves 20 drive the bevel gears 21 to rotate through the bevel gear rings 22, the plurality of bevel gears 21 drive the third threaded rods 24 to rotate through the square rods 23 and the square grooves, the plurality of third threaded rods 24 drive the plurality of second pressing plates 26 to expand outwards, the plurality of pressing plates drive the plurality of second abutting plates 27 to abut against the inner side wall of the top pipe body 2, so that the second bolt can be rotated, the plurality of second abutting blocks 28 are dismounted, the pipe joint is abutted against the top pipe body 2, and the pipe joint is increased. Through the centre gripping push pipe body 2 that first clamping device and second clamping device can be more firm, even at the stopping that the topography that high water pressure water permeability is strong also can be fine.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The novel pipe jacking construction retaining device is suitable for a stratum with high water pressure and strong water permeability, and a plurality of groups of first expansion pieces are distributed along the circumferential direction of a construction opening; a second telescoping member; each group of the first telescopic pieces is respectively provided with a first clamping device for clamping the top pipe body (2); the first clamping device includes: the push pipe comprises a fixed rod (8) connected with the first telescopic piece, a first bolt (9) in threaded connection with the fixed rod (8), an adjusting piece used for driving the first bolt (9), and a first abutting piece connected with the first bolt (9) and used for contacting with the push pipe body (2).
2. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum of claim 1, wherein the second clamping device comprises: the rotating rod (17) is rotatably connected with the second telescopic piece, the rotating rod (17) is far away from one end of the second telescopic piece, the sleeve (19) is rotatably connected with the rotating rod (17), the bevel gear (21) is connected with the sleeve (19), the fixing sleeve (20) is connected with the rotating rod (17), the fixing sleeve (20) is provided with a bevel gear ring (22) matched with the bevel gear (21), a third screw (24) matched with the bevel gear (21), and a second abutting part connected with the third screw (24).
3. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum as claimed in claim 2, wherein a protecting sleeve (25) is connected to the casing (19), and the protecting sleeve (25) is in threaded connection with the third screw (24); the third screw (24) is in transmission connection with the bevel gear (21) through a square rod (23).
4. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum of claim 3, wherein the first telescopic member comprises: the first fixing bolt (3) is arranged at a construction opening, the first threaded rod (6) is connected with the first fixing bolt (3) through a first threaded barrel (5), and the first threaded rod (6) is connected with the first clamping device; the direction of the threads on the surface of the first threaded rod (6) is opposite to the direction of the threads on the surface of the first fixing bolt (3).
5. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum of claim 4, wherein the second telescopic member comprises: the second fixing bolt (4) and a second threaded rod (18) connected with the second fixing bolt (4) through a second threaded barrel (15), and the second clamping device is arranged at one end, far away from the second threaded barrel (15), of the second threaded rod (18).
6. The new pipe jacking construction stopping device suitable for high water pressure and water permeability ground layer as claimed in claim 5, wherein said adjusting member comprises a first gear (12) connected with one end of said first bolt (9) departing from said first abutting member, a gear post (13) rotatably connected with said fixed rod (8), said gear post (13) is matched with said first gear (12), and a first rotating handle (14) connected with said gear post (13).
7. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeability stratum as claimed in claim 6, wherein a sliding block is fixedly connected to one end, close to the square rod (23), of each third threaded rod (24); the plurality of sliding blocks are connected with the plurality of fixed sleeves (20) in a sliding way.
8. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeability stratum as claimed in claim 7, wherein one end of each fixing rod (8) far away from the first threaded rod (6) is fixedly connected with a resisting block (28) through a second bolt; the plurality of abutting blocks (28) are used for abutting against the top pipe body (2).
9. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum of claim 8, wherein the first abutting part comprises: the first pressing plate (10) is connected with the first bolt (9), and the first abutting plate (11) is connected with one end, far away from the first bolt (9), of the first pressing plate (10).
10. The novel pipe jacking construction retaining device suitable for the high-water-pressure and water-permeable stratum as claimed in claim 1, wherein the second fixing bolt (4) is arranged on the side wall of the working well (1) far away from the first fixing bolt (3) and close to the position opposite to the center of the construction opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110645826.3A CN113294160B (en) | 2021-06-10 | 2021-06-10 | Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110645826.3A CN113294160B (en) | 2021-06-10 | 2021-06-10 | Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability |
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| CN113294160A true CN113294160A (en) | 2021-08-24 |
| CN113294160B CN113294160B (en) | 2023-04-25 |
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| CN202110645826.3A Active CN113294160B (en) | 2021-06-10 | 2021-06-10 | Pipe jacking construction retaining device suitable for stratum with high water pressure and high water permeability |
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| CN112519900A (en) * | 2020-12-08 | 2021-03-19 | 陈美珠 | Can improve new energy automobile fin of curved ability of crossing |
| CN212802552U (en) * | 2020-05-12 | 2021-03-26 | 耿嘉翊 | Water supply and drainage heating and ventilation reserved sleeve device |
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2021
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|---|---|---|---|---|
| JP2002364289A (en) * | 2001-06-06 | 2002-12-18 | Kidoh Construction Co Ltd | Device and propulsion pipe for preventing backing |
| JP2003227290A (en) * | 2002-01-31 | 2003-08-15 | Kidoh Construction Co Ltd | Shift preventing device for embedded pipe line in jacking method |
| CN103244126A (en) * | 2013-04-12 | 2013-08-14 | 上海交通大学 | Construction method for preventing retreat of pipe pushing machine and pipe joints |
| CN104907970A (en) * | 2015-07-05 | 2015-09-16 | 冯圣冰 | Variable-diameter fixture for circular ring |
| CN110434779A (en) * | 2019-08-12 | 2019-11-12 | 湘潭大学 | A kind of bi-directional adjustable fixture |
| CN211422652U (en) * | 2019-12-12 | 2020-09-04 | 中电建生态环境集团有限公司 | Urban rock stratum muddy water balance pipe jacking device |
| CN212802552U (en) * | 2020-05-12 | 2021-03-26 | 耿嘉翊 | Water supply and drainage heating and ventilation reserved sleeve device |
| CN111502711A (en) * | 2020-05-26 | 2020-08-07 | 上海公路桥梁（集团）有限公司 | Seam sealing device between jacking pipe and tunnel well |
| CN111927529A (en) * | 2020-09-11 | 2020-11-13 | 中煤科工集团重庆研究院有限公司 | Hole sealing device and external member for downlink pressure measurement drilling and use method of hole sealing device and external member |
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| Publication number | Publication date |
|---|---|
| CN113294160B (en) | 2023-04-25 |
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