CN212105884U - Underground water dredging and draining system for water-rich sandy gravel stratum underground excavated tunnel - Google Patents
Underground water dredging and draining system for water-rich sandy gravel stratum underground excavated tunnel Download PDFInfo
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- CN212105884U CN212105884U CN202020743092.3U CN202020743092U CN212105884U CN 212105884 U CN212105884 U CN 212105884U CN 202020743092 U CN202020743092 U CN 202020743092U CN 212105884 U CN212105884 U CN 212105884U
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Abstract
The utility model provides a rich water sandy gravel stratum undercut tunnel groundwater drainage system, this system's shaft structure, with shaft structure intercommunication and horizontally cross passage structure and with cross passage structure cross arrangement's at least one positive line tunnel structure, the shaft structure includes vertical well body, deposit soil storehouse and ponding storehouse, cross passage structure is just propped including the cross passage, cross passage escape canal, cross passage backfill layer and cross passage sclerosis layer, positive line tunnel structure is just propped including the tunnel, tunnel backfill layer, tunnel sclerosis layer and tunnel escape canal. The utility model discloses make underground water in the tunnel dredge along tunnel and cross passage both sides escape canal, finally converge to the shaft ponding storehouse in, and in the ponding storehouse groundwater with deposit the native storehouse and separate the setting, solved traditional groundwater in the subway tunnel and dredged the mode and lead to the construction road muddy in the tunnel, dregs and groundwater mix in the construction shaft, have environmental pollution's problem.
Description
Technical Field
The utility model relates to a groundwater is dredged and is arranged field, especially a rich water sand cobble stratum undercut tunnel groundwater is dredged and is arranged system.
Background
Underground water in underground excavated tunnels of subways is drained into construction shafts along the bottom of the tunnels through transverse channels, lifted to a ground sedimentation tank from the shafts by a water pump, and finally drained into municipal pipe networks. The method can cause water accumulation in the tunnel and the transverse channel and mud in the construction channel, thereby causing construction inconvenience; and meanwhile, the slag soil in the shaft is mixed with underground water, so that the slag soil is vertically transported, the underground water is poured to wash the side wall of the shaft, certain potential safety hazards exist, and the problem of environmental pollution is caused by the outward transportation of the slag soil with water.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rich water sand cobble stratum undercut tunnel groundwater drainage system, will solve the tradition and dredge drainage and lead to construction passageway ponding and mire in the tunnel to the technical problem that dregs and groundwater mix in the shaft.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a groundwater drainage system of an underground excavation tunnel of a water-rich sandy gravel stratum comprises a vertical shaft structure, a horizontal channel structure communicated with the shaft structure and horizontal, and at least one main line tunnel structure arranged crosswise with the horizontal channel structure,
the vertical shaft structure comprises a vertical well body, a soil storage bin and a water storage bin, wherein the soil storage bin is a bin barrel which is arranged at the rear half part of the bottom of the well body and is sealed at the bottom side and the periphery, and a space is reserved at the front half part of the bottom of the well body and is used as the water storage bin; the soil storage bin is not communicated with the water accumulation bin, the bottom elevation of the vertical shaft structure is lower than the transverse passage structure, the transverse passage structure is just opposite to the soil storage bin, the length of the soil storage bin is greater than the width of the transverse passage structure,
the transverse channel structure comprises a transverse channel primary support, a transverse channel drainage ditch, a transverse channel backfill layer and a transverse channel hardening layer, wherein the transverse channel primary support is a supporting structure of a channel and comprises a bottom plate, a middle plate and a top plate, the transverse channel drainage ditch is built on the upper side of the bottom plate, a water outlet of the transverse channel drainage ditch is communicated into a well body, the water outlet is positioned in the front of a soil storage bin and is close to a position of a water storage bin, the transverse channel backfill layer is backfilled between the upper side of the bottom plate and the transverse channel drainage ditch, the upper side surface of the transverse channel drainage ditch is flush with the upper side surface of the transverse channel backfill layer, the transverse channel hardening layer is sprayed on the upper side of the transverse channel backfill layer, and a drainage ditch steel cover plate covers the transverse channel hardening layer and the position along the transverse channel drainage ditch,
positive line tunnel structure includes that the tunnel is just propped up, tunnel backfill layer, tunnel sclerosis layer and tunnel escape canal, the tunnel is just propped up the bottom of propping up and is led to long backfill and have the tunnel backfill layer, the upside injection on tunnel backfill layer has tunnel sclerosis layer, the upside surface on tunnel sclerosis layer and the lateral passage sclerosis layer side surface parallel and level, tunnel sclerosis layer uses the face to set up both sides around the lateral passage structure along tunnel just a longitudinal separation segmentation in the tunnel scope of excavation completion for the boundary, tunnel escape canal setting is in tunnel backfill layer and tunnel sclerosis layer both sides, is located tunnel just propped up, and tunnel escape canal also becomes the section setting along with tunnel sclerosis layer, tunnel escape canal and lateral passage escape canal intercommunication.
The cross channel drainage ditch includes along the cross channel first vertical setting in the first drainage ditch and the second drainage ditch of cross channel first both sides, still including the third drainage ditch of horizontal setting, the structure of third drainage ditch is the same with the structure of first drainage ditch and second drainage ditch, first drainage ditch is along the vertical logical long setting of cross channel first front side, and the delivery port of first drainage ditch communicates to in the well body, the second drainage ditch is along the vertical setting of cross channel first rear side, and the length of second drainage ditch is less than the length of first drainage ditch, and the tip that the second drainage ditch is close to the shaft structure passes through third drainage ditch and first drainage ditch intercommunication.
The soil storage bin comprises a bin body and vertical supports, the bin body is arranged at the bottom of a well body, the vertical supports are fixedly connected to the periphery of the bin body at intervals, the width of the bin body is matched with the size of the well body, the bin body is close to the rear side of the well body, the vertical supports on the rear side and the left side and the right side of the bin body are respectively tightly attached to the side walls of the well body, a gap between the vertical supports and the side walls is filled with gravel, and the upper side surface of the bin body, the top side of the vertical supports and the upper side surface of a transverse channel backfill layer are flush.
Horizontal inner supports are arranged in the well body and in front of the bin body, the left end and the right end of each horizontal inner support are fixedly connected to the left side wall and the right side wall of the well body respectively, and the set height of each horizontal inner support is the same as the height of the top side face of the bin body.
And a vertical drain pipe is arranged in the water accumulation bin.
The positive line tunnel structure is equipped with the twice altogether, is near well tunnel and far-well tunnel respectively, and the tunnel escape canal in near well tunnel is located the third escape canal and keeps away from one side of the well body.
The two corners of the front side of the bin body are shaped as bevel edges.
The cross passage backfill layer is a natural graded gravel backfill layer with the tunnel backfill layer, the cross passage hardening layer is a concrete hardening layer with the tunnel hardening layer, and the strength of the concrete hardening layer is consistent with the strength of the initially supported concrete of the tunnel.
The storehouse body encloses for the steel sheet and closes the welding and form the steel drum, vertical braces is shaped steel, support for the steel in the level, the cross aisle escape canal is the brick escape canal, the tunnel escape canal is the finished product escape canal.
Compared with the prior art the utility model has the following characteristics and beneficial effect:
the utility model discloses an underground water dredges along tunnel escape canal and cross passage escape canal in proper order in the tunnel, finally converge to in the shaft sump, and groundwater separates the setting with depositing the soil storehouse in the sump, guaranteed the isolation of dregs and water in the shaft, make things convenient for handling and transportation, cross passage temporary passage is just depositing the soil storehouse simultaneously, cross passage escape canal and shaft intercommunication, groundwater walks around in the sump of the soil storehouse flow direction well body front side of well body rear side, guarantee the drying of dregs in the transportation, the difficult road pollution.
The utility model discloses can make the interior construction vehicle safety of tunnel unobstructed the traveling, personnel normally walk, and the safe civilized construction of operation field is up to standard, and excavation dregs and groundwater are wet-dry separation, green.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side cross-sectional view of fig. 1.
Reference numerals: 1-well body, 2-soil storage bin, 21-bin body, 22-vertical support, 3-water collecting bin, 4-transverse channel primary support, 41-bottom plate, 42-middle plate, 43-top plate, 5-transverse channel drainage ditch, 51-first drainage ditch, 52-second drainage ditch, 53-third drainage ditch, 6-transverse channel backfill layer, 7-transverse channel hardened layer, 8-drainage ditch steel cover plate, 9-tunnel primary support, 10-tunnel backfill layer, 11-tunnel hardened layer, 12-tunnel drainage ditch, 13-gravel, 14-horizontal inner support, 15-vertical drainage pipe, 16-near well tunnel, 17-far well tunnel and 18-bevel edge.
Detailed Description
In this embodiment, referring to fig. 1 and fig. 2, a system for draining groundwater from an underground excavation tunnel in a water-rich sandy gravel stratum comprises a vertical shaft structure, a horizontal channel structure communicated with the shaft structure and arranged horizontally, and two straight-line tunnel structures arranged crosswise with the horizontal channel structure.
The vertical shaft structure comprises a vertical well body 1, a soil storage bin 2 and a water accumulation bin 3, wherein the soil storage bin 2 is a bin barrel which is arranged at the rear half part of the bottom of the well body 1 and is sealed at the bottom side and the periphery, and a reserved space at the front half part of the bottom of the well body 1 is used as the water accumulation bin 3; deposit soil storehouse 2 and ponding storehouse 3 and do not communicate, the end elevation of shaft structure is less than horizontal access structure, horizontal access structure is just depositing soil storehouse 2, and the length of depositing soil storehouse 2 is greater than horizontal access structure's width.
The soil storage bin 2 comprises a bin body 21 and vertical supports 22, the bin body 21 is arranged at the bottom of the well body 1, the vertical supports 22 are fixedly connected to the periphery of the bin body 21 at intervals, the width of the bin body 21 is matched with the size of the well body 1, the bin body 21 is close to the rear side of the well body 1, the vertical supports 22 on the rear side and the left side and the right side of the bin body 21 are respectively tightly attached to the side walls of the well body 1, a gap between the vertical supports 22 and the side walls of the well body 1 is filled with gravel 13, and the upper side surface of the bin body 21, the top side surface of the vertical supports 22 and the upper side surface of the transverse channel backfill.
Horizontal inner supports 14 are arranged in the well body 1 and in front of the bin body 21, the left end and the right end of each horizontal inner support 14 are fixedly connected to the left side wall and the right side wall of the well body 1 respectively, and the set height of each horizontal inner support 14 is the same as the top side surface of the bin body 21.
A vertical water drainage pipe 15 is arranged in the water accumulating bin 3.
The cross passage structure includes that cross passage is 4, cross passage escape canal 5, cross passage backfill layer 6 and cross passage sclerosis layer 7 just prop up, cross passage is 4 the supporting construction of passageway just, including bottom plate 41, medium plate 42 and roof 43, cross passage escape canal 5 builds by laying bricks or stones at the upside of bottom plate 41, and the delivery port of cross passage escape canal 5 communicates to the well body 1 in, and the delivery port is located the front portion of depositing soil storehouse 2, is close to the position of ponding storehouse 3, cross passage backfill layer 6 backfills between the upside of bottom plate 41, cross passage escape canal 5, and the upside surface parallel and level of the upside surface cross passage escape canal 5 of cross passage backfill layer 6, the upside of cross passage backfill layer 6 sprays has cross passage sclerosis layer 7, and cross passage sclerosis layer 7 is last, the position along cross passage escape canal 5 covers has escape canal steel cover plate 8.
Positive line tunnel structure includes that the tunnel is just propped up 9, tunnel backfill layer 10, tunnel sclerosis layer 11 and tunnel escape canal 12, the tunnel is just propped up 9 bottom leads to long backfill has tunnel backfill layer 10, the upside injection of tunnel backfill layer 10 has tunnel sclerosis layer 11, the upside surface of tunnel sclerosis layer 11 and the lateral passage sclerosis layer 7 side surface parallel and level, tunnel sclerosis layer 11 uses the face to set up both sides around the lateral passage structure for the border at the tunnel within range of excavation completion along the tunnel is just propped up 9 longitudinal separation segmentation in the tunnel, tunnel escape canal 12 sets up in the both sides of tunnel backfill layer 10 and tunnel sclerosis layer 11, is located the tunnel is just propped up 9 within, tunnel escape canal 12 is also the segmentation along with tunnel sclerosis layer 11 and sets up, tunnel escape canal 12 and lateral passage escape canal 5 intercommunication.
The transverse channel drainage ditch 5 comprises a first drainage ditch 51 and a second drainage ditch 52 which are longitudinally arranged at two sides of a primary transverse channel 4 along the primary transverse channel 4, and further comprises a transversely arranged third drainage ditch 53, the structure of the third drainage ditch 53 is the same as that of the first drainage ditch 51 and the second drainage ditch 52, the first drainage ditch 51 is longitudinally arranged at the front side of the primary transverse channel 4 in a through mode, a water outlet of the first drainage ditch 51 is communicated into the well body 1, the second drainage ditch 52 is longitudinally arranged at the rear side of the primary transverse channel 4 in a through mode, the length of the second drainage ditch 52 is smaller than that of the first drainage ditch 51, and the end part, close to the vertical shaft structure, of the second drainage ditch 52 is communicated with the first drainage ditch 51 through the third drainage ditch 53.
In this embodiment, the positive line tunnel structure is equipped with the twice altogether, is near well tunnel 16 and far well tunnel 17 respectively, and near well tunnel 16's tunnel escape canal 12 is located the third escape canal and keeps away from one side of well body 1.
In this embodiment, the two corners of the front side of the bin body 21 are shaped as bevel edges 18, which facilitates the falling and installation of the bin body.
In this embodiment, cross passageway backfill layer 6 is natural level gravel backfill layer with tunnel backfill layer 10, cross passageway sclerosis layer 7 is the concrete sclerosis layer with tunnel sclerosis layer 11, and the intensity on concrete sclerosis layer is unanimous with the concrete intensity that the tunnel just propped up 9.
In this embodiment, storehouse body 21 encloses for the steel sheet and closes the welding and form the steel drum, vertical support 22 is shaped steel, support for the steel support in the level, cross aisle escape canal 5 is the brick escape canal, tunnel escape canal 12 is the finished product escape canal.
In this embodiment, support in the level is I28b steel shotcrete, and vertical support is 100mm x 6mm square steel, and the storehouse body is made by 20mm thick steel plate, and the size of escape canal steel cover plate is 1100mm x 500mm x 20mm, and the concrete on sclerosis layer is 200mm thick C20 concrete.
The construction method of the underground water dredging and draining system of the underground excavated tunnel in the water-rich sandy gravel stratum comprises the following construction steps:
step one, designing the size of the well body 1 according to the vertical transportation capacity of the vertical shaft structure, processing the soil storage bin 2 into a finished product or a semi-finished product in advance according to the size of the well body 1, and welding vertical supports 22 around the outer wall of the soil storage bin 2.
Secondly, constructing a well body 1, hoisting the soil storage bin 2 to the rear half part of the bottom of the well body 1 for installation, wherein in the installation process of the soil storage bin 2, in order to ensure that no underground water is in the well body 1 for pumping and discharging underground water, vertical supports 22 on the rear side and the left side and the right side of a bin body 21 are respectively attached to the side walls of the well body 1, and in order to prevent the bin body from floating upwards, and filling gravel in a gap between the bin body and the side walls; a space is reserved at the front half part of the bottom of the well body 1 and is used as a water collecting bin 3; after the soil storage bin 2 is installed, underground water pumping and drainage is reduced in the water accumulation bin 3, and the underground water is prevented from entering the soil storage bin 2.
Step three: the construction transverse channel is primarily supported by 4, after the construction, according to the height of the tunnel drainage ditch 12, the construction transverse channel drainage ditch 5 is firstly constructed, then the tunnel backfill layer 10 and the tunnel hardening layer 11 are formed, and the tunnel hardening layer 11 serves as a temporary hardening channel.
Step four: excavating a main line tunnel, repeatedly excavating along with the tunnel face, constructing the primary tunnel support 9 and the backfill layer 10, compacting and compacting the backfill layer of the tunnel, firstly constructing the hardened tunnel layers 11 at the front side and the rear side of the transverse channel structure, installing the shaped tunnel drainage ditches 12 at the two sides of the hardened tunnel layers 11, setting the specific size of the tunnel drainage ditches 12 according to the actual drainage requirement, then setting a section of the hardened tunnel layers 11 and tunnel drainage ditches 12 at intervals of 20-30 m along with the excavation work,
the tunnel escape canal 12 vertically along the slope of the positive line tunnel naturally slopes, the tunnel escape canal 12 transversely sets up 2% slope, the slope is to both sides cross passage escape canal 5, the tunnel escape canal 12 according to the vertical slope of tunnel, 4 intervals are provided with the ponding hole as sedimentation tank and interim emergent drainage station in the cross passage first.
Claims (9)
1. The utility model provides a rich water sandy gravel stratum undercut tunnel groundwater is dredged and is arranged system which characterized in that: comprises a vertical shaft structure, a horizontal channel structure which is communicated with the shaft structure and is horizontal, and at least one front line tunnel structure which is arranged crosswise with the horizontal channel structure,
the vertical shaft structure comprises a vertical well body (1), a soil storage bin (2) and a water accumulation bin (3), wherein the soil storage bin (2) is a bin barrel which is arranged at the rear half part of the bottom of the well body (1) and is sealed at the bottom side and the periphery, and a space is reserved at the front half part of the bottom of the well body (1) and is used as the water accumulation bin (3); the soil storage bin (2) is not communicated with the water storage bin (3), the bottom elevation of the vertical shaft structure is lower than the transverse passage structure, the transverse passage structure is just to the soil storage bin (2), the length of the soil storage bin (2) is greater than the width of the transverse passage structure,
the transverse channel structure comprises a transverse channel primary support (4), a transverse channel drainage ditch (5), a transverse channel backfill layer (6) and a transverse channel hardened layer (7), wherein the transverse channel primary support (4) is a supporting structure of a channel and comprises a bottom plate (41), a middle plate (42) and a top plate (43), the transverse channel drainage ditch (5) is built on the upper side of the bottom plate (41), a water outlet of the transverse channel drainage ditch (5) is communicated into a well body (1), the water outlet is positioned at the front part of a soil storage bin (2) and is close to the position of a water storage bin (3), the transverse channel backfill layer (6) is backfilled between the upper side of the bottom plate (41) and the transverse channel drainage ditch (5), the upper side surface of the transverse channel backfill layer (6) is leveled with the upper side surface of the transverse channel drainage ditch (5), the transverse channel harden layer (7) is sprayed on the upper side of the transverse channel backfill layer (6), and the transverse channel hardened layer (7), A drainage ditch steel cover plate (8) is covered along the position of the transverse channel drainage ditch (5),
the main line tunnel structure comprises a tunnel primary support (9), a tunnel backfill layer (10), a tunnel hardening layer (11) and a tunnel drainage ditch (12), a tunnel backfill layer (10) is filled back into the bottom of the tunnel primary support (9) in a long way, a tunnel hardening layer (11) is sprayed on the upper side of the tunnel backfill layer (10), the upper side surface of the tunnel hardening layer (11) is flush with the upper side surface of the transverse channel hardening layer (7), the tunnel hardening layers (11) are arranged at the front side and the rear side of the transverse channel structure at intervals along the longitudinal direction of the primary tunnel support (9) in the range of the excavated tunnel by taking the tunnel face as a boundary, tunnel escape canal (12) set up in the both sides of tunnel backfill layer (10) and tunnel sclerosis layer (11), lie in the tunnel and just prop up (9) within, tunnel escape canal (12) also become the section setting along with tunnel sclerosis layer (11), tunnel escape canal (12) and cross-channel escape canal (5) intercommunication.
2. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 1, wherein: the transverse channel drainage ditch (5) comprises a first drainage ditch (51) and a second drainage ditch (52) which are longitudinally arranged at two sides of a primary transverse channel (4) along the primary transverse channel (4), and further comprises a transversely arranged third drainage ditch (53), the structure of the third drainage ditch (53) is the same as that of the first drainage ditch (51) and the second drainage ditch (52), the first drainage ditch (51) is longitudinally arranged along the front side of the primary transverse channel (4), a water outlet of the first drainage ditch (51) is communicated into the well body (1), the second drainage ditch (52) is longitudinally arranged along the rear side of the primary transverse channel (4), the length of the second drainage ditch (52) is smaller than that of the first drainage ditch (51), and the end part of the second drainage ditch (52) close to the vertical shaft structure is communicated with the first drainage ditch (51) through the third drainage ditch (53).
3. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 1, wherein: the soil storage bin (2) comprises a bin body (21) and vertical supports (22), the bin body (21) is placed at the bottom of the well body (1), the vertical supports (22) are fixedly connected to the periphery of the bin body (21) at intervals, the width of the bin body (21) is matched with the size of the well body (1), the bin body (21) is close to the rear side of the well body (1), the vertical supports (22) on the rear side and the left side and the right side of the bin body (21) are tightly attached to the side walls of the well body (1), gaps between the bin body and the vertical supports are filled with gravel (13), and the upper side surface of the bin body (21), the top side of the vertical supports (22) and the upper side surface of the transverse channel backfill layer (6) are flush.
4. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 3, wherein: horizontal inner supports (14) are arranged in the well body (1) and in front of the bin body (21), the left end and the right end of each horizontal inner support (14) are fixedly connected to the left side wall and the right side wall of the well body (1) respectively, and the set height of each horizontal inner support (14) is the same as the top side surface of the bin body (21).
5. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 3, wherein: a vertical water drainage pipe (15) is arranged in the water accumulating bin (3).
6. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 1, wherein: the positive line tunnel structure is provided with two channels which are a near well tunnel (16) and a far well tunnel (17), and the tunnel drainage ditch (12) of the near well tunnel (16) is located on one side, far away from the well body (1), of the third drainage ditch.
7. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 3, wherein: the two corners of the front side of the bin body (21) are shaped as bevel edges (18).
8. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 1, wherein: cross passage backfill layer (6) are natural level and join in marriage grit backfill layer with tunnel backfill layer (10), cross passage sclerosis layer (7) are concrete hardening layer with tunnel sclerosis layer (11), and the intensity on concrete hardening layer is unanimous with the concrete intensity of tunnel first branch (9).
9. The underground water dredging and draining system for the underground excavated tunnel of the water-rich sandy gravel stratum as claimed in claim 4, wherein: the storehouse body (21) encloses for the steel sheet and closes the welding and form the steel drum, vertical support (22) are shaped steel, support for the steel support in the level, cross passage escape canal (5) are brick escape canal, tunnel escape canal (12) are the finished product escape canal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020743092.3U CN212105884U (en) | 2020-05-08 | 2020-05-08 | Underground water dredging and draining system for water-rich sandy gravel stratum underground excavated tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020743092.3U CN212105884U (en) | 2020-05-08 | 2020-05-08 | Underground water dredging and draining system for water-rich sandy gravel stratum underground excavated tunnel |
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| Publication Number | Publication Date |
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| CN212105884U true CN212105884U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020743092.3U Expired - Fee Related CN212105884U (en) | 2020-05-08 | 2020-05-08 | Underground water dredging and draining system for water-rich sandy gravel stratum underground excavated tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111350520A (en) * | 2020-05-08 | 2020-06-30 | 北京建工土木工程有限公司 | Underground water drainage system for underground excavation tunnel in water-rich sandy gravel stratum and construction method thereof |
-
2020
- 2020-05-08 CN CN202020743092.3U patent/CN212105884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111350520A (en) * | 2020-05-08 | 2020-06-30 | 北京建工土木工程有限公司 | Underground water drainage system for underground excavation tunnel in water-rich sandy gravel stratum and construction method thereof |
| CN111350520B (en) * | 2020-05-08 | 2024-06-04 | 北京建工土木工程有限公司 | Underground water drainage system and construction method for underground excavation tunnel of water-rich sandy pebble stratum |
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Granted publication date: 20201208 Termination date: 20210508 |