CN110004935A - A kind of locally deep pit drain measure trench system and construction method - Google Patents

A kind of locally deep pit drain measure trench system and construction method Download PDF

Info

Publication number
CN110004935A
CN110004935A CN201910323484.6A CN201910323484A CN110004935A CN 110004935 A CN110004935 A CN 110004935A CN 201910323484 A CN201910323484 A CN 201910323484A CN 110004935 A CN110004935 A CN 110004935A
Authority
CN
China
Prior art keywords
drainage groove
precipitation
drainpipe
sump
drainage
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
CN201910323484.6A
Other languages
Chinese (zh)
Inventor
孙鹏鹏
白小刚
唐高强
陈思睿
宋全
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.)
Shanghai Construction No 1 Group Co Ltd
Original Assignee
Shanghai Construction No 1 Group 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 Shanghai Construction No 1 Group Co Ltd filed Critical Shanghai Construction No 1 Group Co Ltd
Priority to CN201910323484.6A priority Critical patent/CN110004935A/en
Publication of CN110004935A publication Critical patent/CN110004935A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

Abstract

A kind of locally deep pit drain measure trench system of the invention and construction method, are related to foundation pit Yield rainfall relation technical field, for solving the problems, such as that precipitation foundation pit area is big and the Yield rainfall relation construction of dewatering well should not be arranged in foundation pit.It includes the drainage groove for needing connection and reasonable arrangement spacing in precipitation foundation pit, and drainage layer, drainpipe, sandstone and concrete cushion are successively arranged in drainage groove, and drainage layer is wrapped on the outside of drainpipe;Drainage groove both ends are equipped with sump, are equipped with immersible pump in sump, for taking out drop underground.Underground water penetrates into the drainpipe in drainage groove by the drainage layer in drainage groove, then underground water is pooled in the sump of drainage groove end setting by drainpipe, draws water in sump installing submersible pump, reaches the requirement for reducing underground water.It not only can reach the precipitation requirement of different zones difference height difference, and be not to take out and drop excessive underground water, engineering cost can be reduced using this precipitation method.

Description

A kind of locally deep pit drain measure trench system and construction method
Technical field
The present invention relates to foundation pit Yield rainfall relation technical field, in particular to a kind of locally deep pit drain measure trench system and construction Method.
Background technique
A large amount of elevators, catch pit etc. are equipped with compared with depth and the larger foundation pit of area, generally in current raft foundation of high-rise building basis Deepen 2~4 meters than bottom plate, this position difficulty in construction is larger, and there are many problems such as base pit dewatering difficulty.Not such as precipitation When being easy to phenomena such as foundation pit collapse, drift sand, soil disturbance occur, domatic not can guarantee, and handling bad will have a direct impact on ground Bearing capacity, or even to subsequent waterproof, underplate concrete construction causes the loss for being difficult to make up.
Therefore, how a kind of locally deep pit drain measure trench system and construction method are provided, precipitation foundation pit area is applied to The Yield rainfall relation construction of dewatering well should not be set greatly and in foundation pit, water level for local deep foundation pit precipitation is enabled to pass through construction technology safety The technical issues of efficiently realizing, being those skilled in the art's urgent need to resolve.
Summary of the invention
It is an object of that present invention to provide a kind of locally deep pit drain measure trench system and construction methods, in foundation pit, arrangement The gutter of reasonable spacing, by needing the height of precipitation to determine, underground water penetrates into buried depth by the drainage layer in gutter In PVC drain pipe in ditch, then by drainpipe by underground water be pooled to positioned at gutter end setting sump, catchmenting Well installing submersible pump draws water, and reaches the requirement for reducing underground water.Gutter spacing is true according to precipitation height and the precipitation gradient It is fixed, by reasonable Arrangement gutter, it can reach the precipitation requirement of different zones difference height difference, and under being not to take out drop too much Water can reduce engineering cost using this precipitation method.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of locally deep pit drain measure trench system, including need preset several drainage grooves, the row at precipitation foundation pit Drainage layer, drainpipe, sandstone and concrete cushion are successively arranged in water groove, the drainage layer is wrapped in outside the drainpipe Side;The drainage groove both ends are equipped with sump, are equipped with immersible pump in the sump, for taking out drop underground water.
Compared with prior art, the present invention is beneficial has the technical effect that
One, locally deep pit drain measure trench system of the invention and construction method, in foundation pit, the row of connection and reasonable arrangement spacing Water groove is successively arranged drainage layer, drainpipe, sandstone and concrete cushion in drainage groove, and drainage layer is wrapped in drainpipe Outside;Drainage groove both ends are equipped with sump, are equipped with immersible pump in sump, for taking out drop underground.Underground water is by gutter Drainage layer in slot is penetrated into the drainpipe in drainage groove, then underground water is pooled to positioned at drainage groove end by drainpipe It in the sump of portion's setting, draws water in sump installing submersible pump, reaches the requirement for reducing underground water.By to foundation pit earth Body part reasonable Arrangement drainage groove, drainage groove spacing is determining according to precipitation height and the precipitation gradient, the cloth in drainage groove Drainage layer and drainpipe are set, sump is set at drainage groove both ends, can reach the precipitation requirement of different zones difference height difference, again It is not to take out and drops excessive underground water, engineering cost can be reduced using this precipitation method.
Two, locally deep pit drain measure trench system of the invention and construction method, constructing operation is simple, and effect is obvious, saves When less manpower, the dewatering effect of foundation pit can be guaranteed by increasing and decreasing the item number of drainage groove, be easy to accurately control precipitation height, By determining the row's of rising height of sump immersible pump, automatic drop row underground water guarantees the height for reducing underground water, not super drop underground Water level does not allow level of ground water higher yet, realizes accurate control.
Further, the drainage layer includes the different rubble of diameter and thin cobble, wherein the thin cobble covers completely The drainpipe is covered, rubble is located at the thin cobble periphery.By the way that rubble and thin cobble is arranged in drainpipe periphery, thus Drainage layer is formed, so that after underground water first passes through the drainage layer in drainage groove, then penetrate into the drainpipe in drainage groove, from And phenomena such as realizing that not super drop level of ground water does not allow level of ground water higher yet, reducing drift sand, soil disturbance.
Further, in order to draw materials conveniently, saving cost, the drainpipe is PVC drain pipe, meanwhile, in order to extend row The service life of water pipe improves durability, described one of thick nylon net cloth of PVC drain pipe outer wall wrapping.
Further, the drainpipe locally opens up pore, and the pore aperture is 20mm.The filtered underground of drainage layer Water enters drainpipe by pore, and flows through the sump of drainpipe end, is finally extracted out by immersible pump, reaches reduction underground water Requirement.
Further, the sump uses finished diameter assembled for 1 meter of Prefabricated Concrete pipe.It is spelled using Prefabricated Concrete pipe Dress forms sump, prefabricated pipe can direct code build spreading to excavation of foundation pit face or more, prefabricated pipe is directly placed at excavation sump In the sand stone layer of bottom, it is convenient to construct.
Further, it is contemplated that force stability and rigidity requirement, the concrete cushion is with a thickness of 100mm.
Further, the spacing of the drainage groove is determined according to precipitation height and the precipitation gradient, and the precipitation gradient is 1/10~1/15.By the spacing and buried depth between rational deployment adjacent drainage channel groove, it is different high to can reach different zones The precipitation requirement of difference, and be not to take out and drop excessive underground water, engineering cost can be reduced using this precipitation method.
The present invention also provides a kind of construction method of locally deep pit drain measure trench system, which includes:
Excavate the above pit earthwork of level of ground water, drainage groove line setting, mechanical excavation drainage groove, installing submersible pump It takes out and bright arranges casual water in drainage trenching slot;
It is laid with rubble in drainage groove, places PVC drain pipe, and the PVC drain pipe is covered using thin cobble;
Drainage groove is backfilled using sandstone;
Casting concrete bed course;
The sump assembled by Prefabricated Concrete pipe is installed at drainage groove both ends, and installing submersible pump takes out drop underground in sump Water.
Further, in order to meet the precipitation requirement of different zones difference height difference, construction cost, the drainage groove are saved The depth of burying need the depth of precipitation to determine by foundation pit, different precipitation depth areas, the settable difference of drainage groove bottom absolute altitude.
Detailed description of the invention
Fig. 1 is the schematic cross-section of locally deep pit drain measure trench system in one embodiment of the invention;
Fig. 2 is the structural schematic diagram of drainpipe in locally deep pit drain measure trench system in one embodiment of the invention;
Fig. 3 is the schematic cross-section of drainpipe in locally deep pit drain measure trench system in one embodiment of the invention;
Fig. 4 is the setting schematic diagram of drainage groove in locally deep pit drain measure trench system in one embodiment of the invention.Figure In:
1- concrete cushion;2- sandstone;3- rubble;The thin cobble of 4-;5- drainpipe, 51- pore;6- screen cloth;7- draining Groove;The 8- precipitation gradient;9- needs precipitation foundation pit.
Specific embodiment
It to a kind of locally deep pit drain measure trench system proposed by the present invention and is applied below in conjunction with the drawings and specific embodiments Work method is described in further detail.According to following explanation, advantages and features of the invention will be become apparent from.It below will be by listed For embodiment combination attached drawing, the technology contents and feature that the present invention will be described in detail.Need in addition it illustrate, attached drawing is all made of non- Often simplified form and non-accurate ratio is used, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention. For sake of convenience, "upper" described below, "lower" are consistent with the upper and lower direction of attached drawing, but this can't be skill of the present invention The limitation of art scheme.
Embodiment one
Illustrate the structure composition of locally deep pit drain measure trench system of the invention in conjunction with Fig. 1 to Fig. 4.
Please refer to figs. 1 to 4, a kind of locally deep pit drain measure trench system, including needs preset several at precipitation foundation pit 9 Drainage groove 7 is successively arranged drainage layer, drainpipe 5, sandstone 2 and concrete cushion 1 in drainage groove 7, and drainage layer is wrapped in 5 outside of drainpipe;7 both ends of drainage groove are equipped with sump, are equipped with immersible pump in sump, for taking out drop underground water.
Specifically, locally deep pit drain measure trench system of the invention is needing connection and reasonable arrangement spacing at precipitation foundation pit 9 Drainage groove 7 is successively arranged drainage layer, drainpipe 5, sandstone 2 and concrete cushion 1 in drainage groove 7, and drainage layer is wrapped in 5 outside of drainpipe;7 both ends of drainage groove are equipped with sump, are equipped with immersible pump in sump, for taking out drop underground.Underground water warp It crosses the drainage layer in drainage groove 7 to penetrate into the drainpipe 5 in drainage groove, then is collected underground water in place by drainpipe 5 It in the sump of drainage groove end setting, draws water in sump installing submersible pump, reaches the requirement for reducing underground water. By the way that soil mass of foundation pit part reasonable Arrangement drainage groove 7,7 spacing of drainage groove is determined according to precipitation height and the precipitation gradient, Drainage layer and drainpipe 5 are arranged in drainage groove 7, and sump is set at 7 both ends of drainage groove, can reach different zones difference The precipitation requirement of height difference, and be not to take out and drop excessive underground water, it realizes accurate control, engineering can be reduced using this precipitation method Cost.
In the present embodiment, it is highly preferred that drainage layer includes the different rubble 3 and thin cobble 4 of diameter, wherein thin ovum Drainpipe 5 is completely covered in stone 4, and rubble 3 is located at thin 4 periphery of cobble.By in 5 periphery setting rubble 3 of drainpipe and thin ovum Stone 4, so that drainage layer is formed, so that after underground water first passes through the drainage layer in drainage groove 7, then penetrate into drainage groove 7 In drainpipe 5, to realize phenomena such as not super drop level of ground water does not allow level of ground water higher yet, reduces drift sand, soil disturbance.
In the present embodiment, it is highly preferred that in order to draw materials conveniently, cost is saved, drainpipe 5 is PVC drain pipe, meanwhile, In order to extend the service life of drainpipe 5, durability, one of thick nylon net cloth 6 of PVC drain pipe outer wall wrapping are improved.
In the present embodiment, it is highly preferred that 5 part of drainpipe opens up pore 51, pore aperture is 20mm, and along draining The setting of 5 one-week interval of pipe.The filtered underground water of drainage layer enters drainpipe 6 by pore 51, and flows through drainpipe end Sump is finally extracted out by immersible pump, and the requirement for reducing underground water is reached.
In the present embodiment, it is highly preferred that sump uses finished diameter assembled for 1 meter of Prefabricated Concrete pipe.Using Prefabricated Concrete pipe assembly formed sump, prefabricated pipe can direct code build spreading to excavation of foundation pit face more than, prefabricated pipe is directly placed at In the sand stone layer for excavating bottom of catchmenting, it is convenient to construct.
In the present embodiment, more preferably, it is contemplated that force stability and rigidity requirement, concrete cushion 1 with a thickness of 100mm。
In the present embodiment, it is highly preferred that the spacing of drainage groove 7 is determined according to precipitation height and the precipitation gradient 8, precipitation The gradient 8 is 1/10~1/15.By the spacing and buried depth between rational deployment adjacent drainage channel groove 7, not same district can reach The precipitation requirement of domain difference height difference, and be not to take out and drop excessive underground water, engineering cost can be reduced using this precipitation method.
Please continue to refer to Fig. 1 to Fig. 4, the present invention also provides a kind of construction parties of locally deep pit drain measure trench system Method, the construction method include:
Excavate the above pit earthwork of level of ground water, 7 line setting of drainage groove, mechanical excavation drainage groove 7, installation diving Pumping is bright to arrange casual water in drainage trenching slot 7;
It is laid with rubble 3 in drainage groove 7, places PVC drain pipe, and PVC drain pipe is covered using thin cobble 4;
Drainage groove 7 is backfilled using sandstone 2;
Casting concrete bed course 1;
The sump assembled by Prefabricated Concrete pipe is installed at 7 both ends of drainage groove, and installing submersible pump takes out drop ground in sump It is lauched.
In the present embodiment, it is highly preferred that in order to meet the precipitation requirement of different zones difference height difference, saving is constructed into This, the depth of burying of drainage groove 7 needs the depth of precipitation to determine by foundation pit, different precipitation depth areas, 7 bottom of drainage groove mark High settable difference.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims Range.

Claims (9)

1. a kind of locally deep pit drain measure trench system, which is characterized in that including needing preset several gutters at precipitation foundation pit Slot is successively arranged drainage layer, drainpipe, sandstone and concrete cushion in the drainage groove, and the drainage layer is wrapped in institute It states on the outside of drainpipe;The drainage groove both ends are equipped with sump, are equipped with immersible pump in the sump, for taking out drop underground Water.
2. locally deep pit drain measure trench system according to claim 1, which is characterized in that the drainage layer includes diameter Different rubbles and thin cobble, wherein the drainpipe is completely covered in the thin cobble, and rubble is located at outside the thin cobble It encloses.
3. locally deep pit drain measure trench system according to claim 1, which is characterized in that the drainpipe is PVC row Water pipe, described one of thick nylon net cloth of PVC drain pipe outer wall wrapping.
4. locally deep pit drain measure trench system according to claim 1, which is characterized in that the drainpipe locally opens up Pore, the pore aperture are 20mm.
5. locally deep pit drain measure trench system according to claim 1, which is characterized in that the sump uses finished product Diameter is that 1 meter of Prefabricated Concrete pipe is assembled.
6. locally deep pit drain measure trench system according to claim 1, which is characterized in that the concrete cushion thickness For 100mm.
7. locally deep pit drain measure trench system according to claim 1, which is characterized in that the spacing of the drainage groove It is determined according to precipitation height and the precipitation gradient, the precipitation gradient is 1/10~1/15.
8. a kind of construction method of locally deep pit drain measure trench system characterized by comprising
The above pit earthwork of level of ground water is excavated, drainage groove line setting, mechanical excavation drainage groove, installing submersible pump is taken out bright Arrange casual water in drainage trenching slot;
It is laid with rubble in drainage groove, places PVC drain pipe, and the PVC drain pipe is covered using thin cobble;
Drainage groove is backfilled using sandstone;
Casting concrete bed course;
The sump assembled by Prefabricated Concrete pipe is installed at drainage groove both ends, and installing submersible pump takes out drop underground water in sump.
9. construction method according to claim 8, which is characterized in that the depth of burying of the drainage groove is needed by foundation pit The depth of precipitation is determining, different precipitation depth areas, the settable difference of drainage groove bottom absolute altitude.
CN201910323484.6A 2019-04-22 2019-04-22 A kind of locally deep pit drain measure trench system and construction method Pending CN110004935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910323484.6A CN110004935A (en) 2019-04-22 2019-04-22 A kind of locally deep pit drain measure trench system and construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910323484.6A CN110004935A (en) 2019-04-22 2019-04-22 A kind of locally deep pit drain measure trench system and construction method

Publications (1)

Publication Number Publication Date
CN110004935A true CN110004935A (en) 2019-07-12

Family

ID=67173406

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910323484.6A Pending CN110004935A (en) 2019-04-22 2019-04-22 A kind of locally deep pit drain measure trench system and construction method

Country Status (1)

Country Link
CN (1) CN110004935A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112982459A (en) * 2021-03-11 2021-06-18 中国二十二冶集团有限公司 Large-area drainage construction method for strongly weathered rock substrate rich in low-pressure-bearing fracture water
CN113585292A (en) * 2021-08-25 2021-11-02 江苏南通三建集团股份有限公司 Construction process for preventing underground structure from floating when earth is backfilled
CN115217134A (en) * 2022-08-31 2022-10-21 中国二十二冶集团有限公司 Water reducing method for ground surface pore water in pebble bed and weathered rock region in narrow region
CN115288173A (en) * 2022-09-13 2022-11-04 中国五冶集团有限公司 Foundation pit drainage system and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200195289Y1 (en) * 2000-04-07 2000-09-01 임철웅 The structure of round-flat combined drain in dehydration method for soft ground
CN106801427A (en) * 2016-12-15 2017-06-06 宁波二十冶建设有限公司 Foundation ditch horizontal precipitation device and its application method
CN207121911U (en) * 2017-07-28 2018-03-20 江苏华都建设有限公司 A kind of foundation ditch horizontal tube precipitation system
CN108316306A (en) * 2018-03-19 2018-07-24 中国十七冶集团有限公司 A kind of Collapsible Loess District underground pipe gallery foundation pit excavates and cushion construction method
CN108487276A (en) * 2018-04-27 2018-09-04 陕西建工机械施工集团有限公司 A kind of embed-type shallow-layer combined water drain pipe and construction method
CN210288405U (en) * 2019-04-22 2020-04-10 上海建工一建集团有限公司 Local deep pit water conservancy diversion escape canal system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200195289Y1 (en) * 2000-04-07 2000-09-01 임철웅 The structure of round-flat combined drain in dehydration method for soft ground
CN106801427A (en) * 2016-12-15 2017-06-06 宁波二十冶建设有限公司 Foundation ditch horizontal precipitation device and its application method
CN207121911U (en) * 2017-07-28 2018-03-20 江苏华都建设有限公司 A kind of foundation ditch horizontal tube precipitation system
CN108316306A (en) * 2018-03-19 2018-07-24 中国十七冶集团有限公司 A kind of Collapsible Loess District underground pipe gallery foundation pit excavates and cushion construction method
CN108487276A (en) * 2018-04-27 2018-09-04 陕西建工机械施工集团有限公司 A kind of embed-type shallow-layer combined water drain pipe and construction method
CN210288405U (en) * 2019-04-22 2020-04-10 上海建工一建集团有限公司 Local deep pit water conservancy diversion escape canal system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112982459A (en) * 2021-03-11 2021-06-18 中国二十二冶集团有限公司 Large-area drainage construction method for strongly weathered rock substrate rich in low-pressure-bearing fracture water
CN113585292A (en) * 2021-08-25 2021-11-02 江苏南通三建集团股份有限公司 Construction process for preventing underground structure from floating when earth is backfilled
CN115217134A (en) * 2022-08-31 2022-10-21 中国二十二冶集团有限公司 Water reducing method for ground surface pore water in pebble bed and weathered rock region in narrow region
CN115288173A (en) * 2022-09-13 2022-11-04 中国五冶集团有限公司 Foundation pit drainage system and method

Similar Documents

Publication Publication Date Title
CN104196034B (en) A kind of utilize steel sheet pile as the foundation ditch construction method in supporting cofferdam
CN110004935A (en) A kind of locally deep pit drain measure trench system and construction method
CN103046565B (en) Draining method for ultra-deep batholith deep foundation pit
CN105840210A (en) Box type tunnel-bottom composite arched tunnel lining structure with water drain function
CN108547639B (en) Tunnel closes on the advanced same more conduit delamination pour slurry construction methods in hole of existing buildings
CN205677631U (en) It is combined arch tunnel lining structure at the bottom of the box tunnel with hydrophobic function
LU501539B1 (en) Pumping and drainage method for foundation pit bottom plate construction of deep foundation pit and pumping and drainage structure
CN101126242A (en) Method and system for controlling water-level for underground building
CN104499560B (en) Combined rainwater seepage well and construction method
CN110029680A (en) A kind of deep foundation pit precipitation construction method
CN110847199A (en) Construction method for drainage of underground water of deep foundation pit
CN102383408B (en) Greening method for high water level impermeable saline and alkaline lands and greening system
CN103967015B (en) A kind of water seal for deep foundation pit excavation method and structure thereof
CN209066468U (en) A kind of base pit dewatering device
CN104775439A (en) Foundation pit support and water stop integrated structure and construction method thereof
KR100665984B1 (en) The construction method of basement self drainage
CN208578054U (en) A kind of embed-type shallow-layer combined water drain pipe
CN209555956U (en) Drop and drainage structure is secretly buried in a kind of drainage
CN218148458U (en) Deep water deep foundation pit drainage system of fissure development rock stratum
CN110468853A (en) Large-scale friction pile present tube band drainage system and construction method
CN210288405U (en) Local deep pit water conservancy diversion escape canal system
CN216640547U (en) Drainage decompression anti-floating system suitable for weak permeable soft soil stratum
CN110185051A (en) Deep narrow excavation water discharge method
CN108755724A (en) The external water drainage waterproof method of pipe gallery
CN213448534U (en) Sealing and lowering combined pressure-bearing water control system

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