CN111997180A - Dredging device for hydraulic engineering - Google Patents

Dredging device for hydraulic engineering Download PDF

Info

Publication number
CN111997180A
CN111997180A CN202010875086.8A CN202010875086A CN111997180A CN 111997180 A CN111997180 A CN 111997180A CN 202010875086 A CN202010875086 A CN 202010875086A CN 111997180 A CN111997180 A CN 111997180A
Authority
CN
China
Prior art keywords
pipe
outer sleeve
ring
hydraulic engineering
bearing pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010875086.8A
Other languages
Chinese (zh)
Inventor
胡丽娥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan 352 Environmental Protection Technology Co ltd
Original Assignee
Hunan 352 Environmental Protection Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan 352 Environmental Protection Technology Co ltd filed Critical Hunan 352 Environmental Protection Technology Co ltd
Priority to CN202010875086.8A priority Critical patent/CN111997180A/en
Publication of CN111997180A publication Critical patent/CN111997180A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F9/00Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing
    • E03F9/002Cleaning sewer pipes by mechanical means

Abstract

The invention discloses a dredging device for hydraulic engineering, which comprises an outer sleeve and a bearing pipe, wherein the outer sleeve is sleeved outside the bearing pipe, the outer sleeve is in clearance fit with the bearing pipe, a filling ring is arranged above the bearing pipe, and a plurality of groups of support arms for supporting the filling ring are arranged on the outer side of the top end of the bearing pipe in a surrounding manner; the packing ring is of an annular hollow structure, a filter screen is arranged on the inner side of the packing ring, and a guide pipe is arranged at the top end of the bearing pipe. Has the advantages that: according to the invention, the foldable filling ring is arranged at the end part of the dredging equipment, so that the volume of the filling ring structure is reduced in the process that the supporting arm supports the filling ring to extend into the siltation pipeline, then the filling ring with the built-in filter screen is expanded and inflated to be tightly abutted against the inner walls of the channels with different shapes and sizes in the cleaning process, and the filling ring is pulled outwards to push and discharge the sludge outwards, so that the dredging convenience is improved, and the practicability is strong.

Description

Dredging device for hydraulic engineering
Technical Field
The invention relates to the field of hydraulic engineering equipment, in particular to a dredging device for hydraulic engineering.
Background
Hydraulic engineering is a general term for various engineering constructions built for controlling, utilizing and protecting water resources and environments on the earth surface and underground. Water is a valuable resource essential to human production and life, but the naturally existing state of the water does not completely meet the needs of human beings, and water flow is controlled by building hydraulic engineering to prevent flood disasters and regulate and distribute water quantity so as to meet the needs of the people on water resources in life and production. Because different types of hydraulic buildings such as dams, dikes and sluice gates need to be built in hydraulic engineering, a large amount of silt and sediment usually deposit in water passing channels such as water inlets, channels, crossing troughs, rafts, fishways and spillways, so that the water passing channels are blocked, and the smoothness of water passing is influenced.
The applicant finds that at least the following technical problems exist in the prior art: the desilting equipment that uses at present uses the pole utensil that has crotch, scraper blade structure to clear up the deposit in the passageway, and operation process is loaded down with trivial details, and passes the deposit to the deeper department in the passageway easily, and the practicality is poor.
Disclosure of Invention
The invention aims to solve the problems and provide a dredging device for hydraulic engineering, wherein a foldable annular cleaning structure is arranged at the end part of dredging equipment so as to reduce the volume of the end part of the equipment in the process of extending the dredging equipment into a siltation pipeline, a filling ring with a built-in filter screen is unfolded and inflated to tightly abut against the inner walls of channels with different shapes and sizes in the cleaning process, and sludge is pushed and discharged outwards by pulling the filling ring outwards, so that the dredging convenience is improved, the practicability is high, and the following explanation is provided for details.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a dredging device for hydraulic engineering, which comprises an outer sleeve and a bearing pipe, wherein the outer sleeve is sleeved outside the bearing pipe, the outer sleeve is in clearance fit with the bearing pipe, a filling ring is arranged above the bearing pipe, and a plurality of groups of support arms for supporting the filling ring are arranged on the outer side of the top end of the bearing pipe in a surrounding manner;
the packing ring is of an annular hollow structure, a filter screen is arranged on the inner side of the packing ring, a guide pipe is arranged at the top end of the bearing pipe, and the bearing pipe is communicated with one side of the bottom of the packing ring through the guide pipe.
When the dredging device for the hydraulic engineering is used and a channel with sediments adhered to the inner wall of the pipeline needs to be cleaned, the supporting pipe is pulled downwards under the support of the outer sleeve to pull and fold the supporting arm downwards under the support of the connecting rod, so that the supporting arm supports the filling ring to be folded towards the inner side so as to shrink and pack the filling ring, then the filling ring extends into the pipeline to be cleaned under the support of the supporting pipe, then the supporting pipe is pushed under the support of the outer sleeve, the filling ring is unfolded under the matching action of the supporting pipe top end supporting arm and the connecting rod, then the filling ring is inflated through the inflation connector at the bottom end of the supporting pipe so as to inflate and expand the filling ring to be tightly propped against the position of the inner wall of the pipeline to be cleaned, then the water is supplied into the water injection connector through the external water pump, and the auxiliary pipe is used for filling water into the outer sleeve, in order to treat clean pipeline with the sparge water leading-in at outer sleeve pipe top open position, outwards pull outer sleeve pipe and support pipe in step simultaneously, through the pipeline is scraped with the sediment of pipeline inner wall adhesion to the packing ring cooperation filter screen of support pipe tip, realizes the clean process in the hydraulic engineering water channel.
Preferably, the bottom end of the support arm is hinged to the outer side of the top end of the support pipe, the top end of the support arm extends outwards, and the top end of the support arm is hinged to the outer side edge of the bottom of the filling ring.
Preferably, the outer sleeve top outside corresponds the support arm is provided with the multiunit pull rod, the pull rod bottom with the outer sleeve lateral wall is articulated mutually, the pull rod top upwards extends and articulate in the support arm middle part outside.
Preferably, the outer sleeve and the bearing pipe are both stainless steel tubular structures, a sealing ring is fixed at the bottom end of the outer sleeve and is sleeved outside the bearing pipe, and the inner diameter of the sealing ring is tightly abutted to the outer wall of the bearing pipe.
Preferably, the filter screen is flexible screen cloth material, filter screen outside border with fill ring internal diameter looks parallel and level, just the filter screen with it is fixed to fill the ring through the viscose bonding.
Preferably, the filling ring is made of polyurethane elastic rubber, an inflation insertion pipe is arranged at the bottom of the filling ring close to one side of the guide pipe, the filling ring is connected with the top end of the guide pipe in an inserting mode through the inflation insertion pipe, and the guide pipe is of a flexible rubber pipe structure.
Preferably, the supporting tube vertically penetrates out of the outer sleeve, the bottom end of the supporting tube extends to the lower portion of the bottom end of the outer sleeve, an inflation connector is arranged at the bottom end of the supporting tube, and a switch valve is arranged on the supporting tube above the inflation connector.
Preferably, an auxiliary tube is arranged on the outer side of the middle of the outer sleeve and extends transversely, the auxiliary tube and the outer sleeve are integrally formed, and one end of the inner side of the auxiliary tube is communicated with the outer sleeve.
Preferably, a water injection joint is arranged at one end, far away from the outer sleeve, of the auxiliary pipe, two groups of drain holes are symmetrically arranged on two sides of the outer side of the top end of the outer sleeve below the support arm, and the drain holes transversely penetrate through the side wall of the outer sleeve.
Preferably, the outer side of the outer sleeve below the auxiliary tube is sleeved with a handle sleeve, the handle sleeve is fixedly bonded to the outer wall of the outer sleeve, and a plurality of groups of anti-skid grooves surrounding the outer circumference of the handle sleeve are vertically and uniformly arranged on the outer side of the handle sleeve.
Has the advantages that: according to the invention, the foldable filling ring is arranged at the end part of the dredging equipment, so that the volume of the filling ring structure is reduced in the process that the supporting arm supports the filling ring to extend into the siltation pipeline, then the filling ring with the built-in filter screen is expanded and inflated to be tightly abutted against the inner walls of the channels with different shapes and sizes in the cleaning process, and the filling ring is pulled outwards to push and discharge the sludge outwards, so that the dredging convenience is improved, and the practicability is strong.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view structural diagram of the present invention;
FIG. 2 is an internal structural view of the present invention;
FIG. 3 is a partial block diagram of the present invention;
FIG. 4 is an enlarged view of the structure of FIG. 3 at A;
fig. 5 is an enlarged view of the structure at B of fig. 3.
The reference numerals are explained below:
1. an outer sleeve; 101. a seal ring; 102. a drain hole; 2. a bearer tube; 201. a guide tube; 202. an inflation joint; 3. filling the ring; 301. a filter screen; 4. a support arm; 5. a pull rod; 6. an auxiliary tube; 601. a water injection joint; 7. a handle sleeve; 701. and (4) an anti-slip groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1 to 5, the invention provides a dredging device for hydraulic engineering, which comprises an outer sleeve 1 and a bearing pipe 2, wherein the outer sleeve 1 is sleeved outside the bearing pipe 2, the outer sleeve 1 is in clearance fit with the bearing pipe 2, a filling ring 3 is arranged above the bearing pipe 2, and a plurality of groups of support arms 4 for supporting the filling ring 3 are arranged around the outer side of the top end of the bearing pipe 2;
the packing ring 3 is an annular hollow structure, a filter screen 301 is arranged on the inner side of the packing ring 3, a guide pipe 201 is arranged at the top end of the bearing pipe 2, and the bearing pipe 2 is communicated with one side of the bottom of the packing ring 3 through the guide pipe 201.
As optional implementation mode, 4 bottom ends of support arm articulate in the 2 top outsides of trusteeship, and 4 top ends of support arm extend to the outside, and 4 top ends of support arm articulate in 3 bottom outside borders of packing ring, and the 1 top outside of outer tube corresponds support arm 4 and is provided with multiunit pull rod 5, and 5 bottom ends of pull rod articulate mutually with 1 lateral wall of outer tube, and 5 top ends of pull rod extend upwards and articulate in 4 middle part outsides of support arm to support the jack-up to support arm 4 through pull rod 5, thereby improve the support stability of support arm 4 to packing ring 3.
The outer sleeve 1 and the bearing pipe 2 are both stainless steel tubular structures, the bottom end of the outer sleeve 1 is fixed with a sealing ring 101, the sealing ring 101 is sleeved outside the bearing pipe 2, the inner diameter of the sealing ring 101 is tightly abutted to the outer wall of the bearing pipe 2, the sealing ring 101 is of a rubber ring structure, and the outer wall of the bearing pipe 2 is sealed through the sealing ring 101 at the bottom end of the outer sleeve 1;
the filter screen 301 is made of flexible mesh cloth, the outer side edge of the filter screen 301 is flush with the inner diameter of the filling ring 3, the filter screen 301 and the filling ring 3 are fixedly bonded through viscose, the filling ring 3 is made of polyurethane elastic rubber to ensure that the filling ring 3 has elasticity and wear resistance, an inflation insertion pipe is arranged at one side, close to the guide pipe 201, of the bottom of the filling ring 3, the filling ring 3 is connected with the top end of the guide pipe 201 in an insertion mode through the inflation insertion pipe, the guide pipe 201 is of a flexible rubber pipe structure, and the support pipe 2 is communicated with the filling ring 3 through the guide pipe 201;
the supporting pipe 2 vertically penetrates through the outer sleeve 1, the bottom end of the supporting pipe 2 extends to the lower portion of the bottom end of the outer sleeve 1, an inflation connector 202 is arranged at the bottom end of the supporting pipe 2, and a switch valve is arranged on the supporting pipe 2 above the inflation connector 202, so that the opening and closing state of the supporting pipe 2 is controlled through the switch valve;
an auxiliary tube 6 is arranged outside the middle part of the outer sleeve 1, the auxiliary tube 6 extends transversely, the auxiliary tube 6 and the outer sleeve 1 are formed integrally, and one end of the inner side of the auxiliary tube 6 is communicated with the outer sleeve 1, one end of the auxiliary tube 6 far away from the outer sleeve 1 is provided with a water injection joint 601, two groups of water discharge holes 102 are symmetrically arranged at the two sides of the top end of the outer sleeve 1 below the support arm 4, and the water discharge holes 102 transversely penetrate through the side wall of the outer sleeve 1, an external water pump is connected through the water injection joint 601 to supply water to the auxiliary pipe 6, the washing water is guided into the outer sleeve 1 through the auxiliary pipe 6, the flushing water is discharged to the deposition position inside the pipeline through the top end of the outer sleeve 1 and the two sets of water discharge holes 102, so as to wash away the sludge, the outer side of the outer sleeve 1 below the auxiliary tube 6 is sleeved with the handle sleeve 7, the handle sleeve 7 is adhered and fixed on the outer wall of the outer sleeve 1, and a plurality of groups of anti-slip grooves 701 surrounding the outer circumference of the handle sleeve 7 are vertically and uniformly arranged on the outer side of the handle sleeve 7.
By adopting the structure, when a channel with sediments adhered to the inner wall of the pipeline needs to be cleaned in the using process, the supporting pipe 2 is pulled downwards under the support of the outer sleeve 1 to pull and fold the supporting arm 4 downwards under the support of the connecting rod, so that the filling ring 3 is supported by the supporting arm 4 to be folded inwards to shrink and retract the filling ring 3, then the filling ring 3 extends into the pipeline to be cleaned under the support of the supporting pipe 2, then the supporting pipe 2 is pushed under the support of the outer sleeve 1, the filling ring 3 is propped open under the matching action of the supporting arm 4 at the top end of the supporting pipe 2 and the connecting rod, then the filling ring 3 is inflated through the inflation connector 202 at the bottom end of the supporting pipe 2, so that the filling ring 3 is inflated and expanded and is propped against the position of the inner wall of the pipeline to be cleaned, then water is supplied into the water injection connector 601 through an external water pump, and the auxiliary pipe 6 is used for filling water into the outer sleeve 1, introducing flushing water into a pipeline to be cleaned at the opening position of the top end of the outer sleeve 1, simultaneously pulling the outer sleeve 1 and the supporting pipe 2 outwards and synchronously pushing sediments adhered to the inner wall of the pipeline out of the pipeline by matching the filling ring 3 at the end part of the supporting pipe 2 with the filter screen 301, so that the cleaning process in a water channel of hydraulic engineering is realized;
through set up collapsible packing ring 3 of packing up at dredging equipment tip to support at support arm 4 and pack ring 3 and stretch into the interior in-process of siltation pipeline and reduce packing ring 3 structure volume, later prop out and aerify in order to support tightly in the passageway inner wall of different shape sizes with the packing ring 3 of built-in filter screen 301 at the clearance in-process, pack ring 3 through outside pulling and in order to promote the discharge outward with the sediment, improve the desilting convenience, the practicality is strong.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. The utility model provides a sediment removal device for hydraulic engineering which characterized in that: the device comprises an outer sleeve (1) and a bearing pipe (2), wherein the outer sleeve (1) is sleeved on the outer side of the bearing pipe (2), the outer sleeve (1) is in clearance fit with the bearing pipe (2), a filling ring (3) is arranged above the bearing pipe (2), and a plurality of groups of support arms (4) for supporting the filling ring (3) are arranged on the outer side of the top end of the bearing pipe (2) in a surrounding manner;
the packing ring (3) is of an annular hollow structure, a filter screen (301) is arranged on the inner side of the packing ring (3), a guide pipe (201) is arranged at the top end of the bearing pipe (2), and the bearing pipe (2) is communicated with one side of the bottom of the packing ring (3) through the guide pipe (201).
2. The dredging device for hydraulic engineering according to claim 1, wherein: the bottom end of the support arm (4) is hinged to the outer side of the top end of the supporting and supporting pipe (2), the top end of the support arm (4) extends to the outer side, and the top end of the support arm (4) is hinged to the outer side edge of the bottom of the filling ring (3).
3. The dredging device for hydraulic engineering according to claim 2, wherein: the outer tube (1) top outside corresponds support arm (4) are provided with multiunit pull rod (5), pull rod (5) bottom with outer tube (1) lateral wall is articulated mutually, pull rod (5) top upwards extends and articulate in support arm (4) middle part outside.
4. The dredging device for hydraulic engineering according to claim 1, wherein: the outer sleeve (1) and the supporting tube (2) are both stainless steel tubular structures, a sealing ring (101) is fixed at the bottom end of the outer sleeve (1), the sealing ring (101) is sleeved on the outer side of the supporting tube (2), and the inner diameter of the sealing ring (101) is tightly abutted to the outer wall of the supporting tube (2).
5. The dredging device for hydraulic engineering according to claim 1, wherein: filter screen (301) are flexible screen cloth material, filter screen (301) outside border with fill ring (3) inner diameter looks parallel and level, just filter screen (301) with it is fixed to fill ring (3) through the viscose bonding.
6. The dredging device for hydraulic engineering according to claim 1, wherein: the packing ring (3) is made of polyurethane elastic rubber, the bottom of the packing ring (3) is close to one side of the guide pipe (201) and is provided with an inflatable insertion pipe, the packing ring (3) is connected with the top end of the guide pipe (201) in an inserting mode through the inflatable insertion pipe, and the guide pipe (201) is of a flexible rubber pipe structure.
7. The dredging device for hydraulic engineering according to claim 1, wherein: the bearing pipe (2) vertically penetrates out the outer sleeve (1), the bottom end of the bearing pipe (2) extends to the lower portion of the bottom end of the outer sleeve (1), an inflation connector (202) is arranged at the bottom end of the bearing pipe (2), and a switch valve is arranged on the bearing pipe (2) above the inflation connector (202).
8. The dredging device for hydraulic engineering according to claim 1, wherein: the outer sleeve is characterized in that an auxiliary pipe (6) is arranged on the outer side of the middle of the outer sleeve (1), the auxiliary pipe (6) transversely extends, the auxiliary pipe (6) and the outer sleeve (1) are integrally formed, and one end of the inner side of the auxiliary pipe (6) is communicated with the outer sleeve (1).
9. The sediment removal device for hydraulic engineering according to claim 8, characterized in that: one end, far away from the outer sleeve (1), of the auxiliary pipe (6) is provided with a water injection joint (601), two groups of drain holes (102) are symmetrically formed in the outer two sides of the top end of the outer sleeve (1) below the support arm (4), and the drain holes (102) transversely penetrate through the side wall of the outer sleeve (1).
10. The sediment removal device for hydraulic engineering according to claim 9, characterized in that: the outer sleeve (1) outside of the auxiliary tube (6) is sleeved with a handle sleeve (7), the handle sleeve (7) is bonded and fixed on the outer wall of the outer sleeve (1), and a plurality of groups of anti-slip grooves (701) surrounding the outer circumferential side of the handle sleeve (7) are vertically and uniformly arranged on the outer side of the handle sleeve (7).
CN202010875086.8A 2020-08-27 2020-08-27 Dredging device for hydraulic engineering Pending CN111997180A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010875086.8A CN111997180A (en) 2020-08-27 2020-08-27 Dredging device for hydraulic engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010875086.8A CN111997180A (en) 2020-08-27 2020-08-27 Dredging device for hydraulic engineering

Publications (1)

Publication Number Publication Date
CN111997180A true CN111997180A (en) 2020-11-27

Family

ID=73471407

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010875086.8A Pending CN111997180A (en) 2020-08-27 2020-08-27 Dredging device for hydraulic engineering

Country Status (1)

Country Link
CN (1) CN111997180A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208309783U (en) * 2018-05-07 2019-01-01 中机国际工程设计研究院有限责任公司 Tube cleaning mechanism
CN208748816U (en) * 2018-08-15 2019-04-16 南京亿纵天通信工程有限公司 The cleaning plant of mud in pipeline
CN208763176U (en) * 2018-09-06 2019-04-19 厦门骏特市政工程有限公司 A kind of Urban Underground circle rain pipe dredging device
CN208815662U (en) * 2018-05-07 2019-05-03 中机国际工程设计研究院有限责任公司 Pipe cleaning device
US20200215590A1 (en) * 2019-01-09 2020-07-09 Fudong PAN Paw type quick guiding dredging device for household sewer pipe
CN211228846U (en) * 2019-11-14 2020-08-11 张欢 Municipal administration pipeline dredging device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN208309783U (en) * 2018-05-07 2019-01-01 中机国际工程设计研究院有限责任公司 Tube cleaning mechanism
CN208815662U (en) * 2018-05-07 2019-05-03 中机国际工程设计研究院有限责任公司 Pipe cleaning device
CN208748816U (en) * 2018-08-15 2019-04-16 南京亿纵天通信工程有限公司 The cleaning plant of mud in pipeline
CN208763176U (en) * 2018-09-06 2019-04-19 厦门骏特市政工程有限公司 A kind of Urban Underground circle rain pipe dredging device
US20200215590A1 (en) * 2019-01-09 2020-07-09 Fudong PAN Paw type quick guiding dredging device for household sewer pipe
CN211228846U (en) * 2019-11-14 2020-08-11 张欢 Municipal administration pipeline dredging device

Similar Documents

Publication Publication Date Title
KR20080040372A (en) Underwater washing apparatus of the water pipes
CN206737109U (en) A kind of drainage dredging equipment
CN205671152U (en) Telescopic buried rainer
CN211948826U (en) Pipeline dredging device for hydraulic engineering construction
CN111997180A (en) Dredging device for hydraulic engineering
CN209429150U (en) A kind of construction of hydro project water-proof drainage device
CN110130452A (en) A kind of water-saving noiseless multifunctional closestool structure of high pressure straight-line
CN110055988A (en) For foundation pit drainage-decompression inner curtain type combined shaft and working method and application
JP2013185372A (en) Drainage method for dammed lake
CN102619270A (en) Anti-blocking toilet with dredging device
CN113802639B (en) System and method for cleaning river silt for hydraulic engineering
CN208072578U (en) A kind of drainage arrangement in sponge urban applications
CN111335387B (en) Uplift platform annular groove excavation method for uplift pile on building foundation
CN214497395U (en) Hydraulic engineering construction bank protection
CN209011202U (en) A kind of floating water intaking device
CN101245608A (en) Toilet clog removal and cleaning system
CN211873124U (en) A isolating device that is used for riverbed bed mud normal position to take out from
CN203284859U (en) Deodorization drainage valve operating in double control modes
CN210066868U (en) Light water excavator for river ecological restoration
CN112943319A (en) Sealing water-stopping structure for shield tunneling machine to enter and exit tunnel and construction process
CN111910617A (en) Side-expansion compaction composite vacuum drainage type soft foundation reinforcing system and construction method
CN213805200U (en) Hydraulic engineering design construction waterproof construction
CN216108569U (en) Simple to operate's cofferdam that river course desilting was used
CN220013920U (en) Novel durable double-layer underground drain pipe capable of being cleaned and updated
CN213539073U (en) Novel hole plugging device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20201127

RJ01 Rejection of invention patent application after publication