CN113463670A - Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction - Google Patents
Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction Download PDFInfo
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- CN113463670A CN113463670A CN202111024454.9A CN202111024454A CN113463670A CN 113463670 A CN113463670 A CN 113463670A CN 202111024454 A CN202111024454 A CN 202111024454A CN 113463670 A CN113463670 A CN 113463670A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/36—Foundations formed in moors or bogs
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/28—Placing of hollow pipes or mould pipes by means arranged inside the piles or pipes
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- Environmental & Geological Engineering (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
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Abstract
The invention discloses a pumping drainage structure and a method suitable for construction of a deep foundation pit base plate of a stratum in a strongly-weathered permeable fracture zone. During the period of planting the ribs and pouring of the deep foundation pit base plate, the large water pressure at the bottom of the deep foundation pit is drained through the blind ditch, so that the pouring of the deep foundation pit base plate is facilitated; during service, the blind ditch can reduce the great water pressure that foundation ditch bottom plate probably bore. The invention has the advantages of simple structure and convenient construction, and meets the waterproof requirement of the foundation pit bottom plate of the deep foundation pit.
Description
Technical Field
The invention relates to a blind ditch structure of a stratum deep foundation pit of a permeable fractured zone, in particular to a pumping drainage structure suitable for construction of a bottom plate of the stratum deep foundation pit of a strongly weathered permeable fractured zone.
Background
With the rapid development of Chinese construction, the shortage of overground resources accelerates the exploration of underground urban spaces, and the construction of various underground projects depends on foundation pits. The foundation pit (or working well) is generally used for the construction of tunnels or subways in municipal engineering, and also can be used for the construction of water supply and drainage engineering, oil wells and mine engineering. As an underground passage for engineering construction of tunnels or subways and the like, safe construction is an important guarantee for ensuring the smooth operation of the whole engineering. Because underground geological conditions are complex, foundation pit (or working well) construction, especially deep foundation pit bottom plate construction still has great difficulty, especially when bottom plate construction is carried out in the strong weathering permeable fault zone stratum, because strong underground water pressure and infiltration capacity make foundation pit bottom plate pouring difficult to accomplish smoothly, if handle improper can cause concrete placement construction quality to be difficult to control scheduling problem, therefore put forward higher requirement to strong weathering permeable fault zone stratum deep foundation pit bottom plate construction.
The pouring of the deep foundation pit bottom plate is an important work in underground engineering construction, and the deep foundation pit bottom plate should be completely linked with a well wall and meet the anti-seepage requirement. There is the highly permeable layer in deep basal pit bottom plate department, when having great water pressure, generally through setting up methods such as drainage well and reducing ground water level to reduce the influence of water pressure to deep basal pit bottom plate.
But the method has larger precipitation range and higher workload and construction cost. Particularly, in the stratum of the strongly weathered permeable fracture zone and when the foundation pit is deeply buried, the effects of conventional methods such as well point dewatering are difficult to guarantee under the influence of geological conditions, and the water stopping and draining requirements of the strongly weathered deep foundation pit cannot be met, so that the bottom plate pouring risk is high, and safety accidents are easy to happen. In order to ensure that the deep foundation pit bottom plate is smoothly poured in the strongly weathered permeable fracture zone stratum, a simple and reliable water pumping structure and a method are urgently needed to be invented to meet the pouring condition of the bottom plate and reduce the construction risk.
Disclosure of Invention
Aiming at the prior art, the invention provides a pumping drainage structure and a pumping drainage method suitable for construction of a deep foundation pit bottom plate of a strongly weathered permeable fractured zone stratum, which aim to solve the technical defects of high construction risk and easily-caused groundwater permeability problem when the construction of the deep foundation pit bottom plate is carried out on the strongly weathered permeable fractured zone stratum.
In order to solve the technical problems, the invention provides a pumping and drainage method for deep foundation pit bottom plate construction, which adopts a water conservancy channel with a blind ditch structure for pumping and drainage of deep foundation pit bottom plates of stratums of a strongly weathered permeable fractured zone, and comprises the following steps:
firstly, before construction, determining the underground water level according to geological data and hydrological data in the foundation pit construction range, calculating the underground water pressure, and formulating the drainage requirement; designing the proportion of broken stones and coarse sands in the sand-stone mixture for backfilling the blind ditch according to the determined underground water level and the drainage requirement; setting the height of the groove, the width of the bottom surface of the groove and the slope ratio of the wall of the groove according to the depth of the foundation pit, the area of the bottom plate of the foundation pit, the water pressure of the bottom plate of the foundation pit and the drainage requirement; setting the thickness and the grade of a concrete cushion layer according to the size of a blind ditch, the underground water pressure and the drainage requirement, wherein the size of the blind ditch comprises the height of the ditch, the width of the bottom surface of the ditch and the slope ratio of the walls of the ditch;
step two, implementing the construction of the foundation pit structure, namely constructing to the process before the foundation pit bottom plate;
thirdly, completing the blind ditch construction of the following structure by adopting mechanical equipment operation: the blind ditch is formed by a plurality of annular grooves which are concentrically arranged and a plurality of radial grooves which are radial according to the center and penetrate through the plurality of annular grooves, after sand and stone mixture is backfilled in the annular grooves and the radial grooves, a concrete cushion layer with preset thickness and strength is laid on the upper part, and a hole site of a water collecting well is reserved at the intersection of one radial groove and one annular groove;
after the strength of the concrete cushion layer meets the requirement, planting and pouring of the foundation pit bottom plate are started, and meanwhile, the position of the water collecting well is reserved; the water collecting tank is used for storing underground water drained by the water collecting well;
and fifthly, in the process of planting bars and pouring on the foundation pit bottom plate, the water collecting well collects the underground water drained by the blind ditch, water is conveyed to the water collecting tank from the water collecting well through the water pump, and the underground water is conveyed to the ground surface from the water collecting tank along a drain pipe of the high-power water pump by the high-power water pump periodically.
Further, the invention relates to a pumping and drainage method for deep foundation pit bottom plate construction, wherein the pumping and drainage method comprises the following steps:
the mass ratio of the broken stones to the coarse sand in the sand-stone mixture is 2: 1.
When the construction of the foundation pit structure is carried out, the blind ditch extends to the position where obvious water seepage occurs.
The cross section of the circumferential groove and the cross section of the radial groove are both trapezoids with wide upper parts and narrow lower parts; the height of the groove is 400mm, the width of the bottom surface of the groove is 400mm, and the slope ratio of the groove wall is 1: 0.3.
The concrete cushion is a layer of C15 concrete with a reference thickness of 100 mm.
And setting the volume of the water collecting tank according to the water yield.
The invention also provides a pumping drainage structure for realizing the pumping drainage method for the construction of the deep foundation pit bottom plate, which comprises a blind ditch arranged at the bottom of the concrete cushion layer below the foundation pit bottom plate and a water collecting well which is downwards communicated to the blind ditch from the foundation pit bottom plate, wherein the blind ditch comprises a plurality of annular grooves which are concentrically arranged and a plurality of radial grooves which are radially arranged according to the center and penetrate through the plurality of annular grooves, the cross sections of the annular grooves and the radial grooves are both trapezoids with wide top and narrow bottom, the water collecting well is arranged at the intersection of one radial groove and one annular groove, the pumping drainage structure also comprises a water collecting tank arranged on the foundation pit bottom plate and a water pump arranged in the water collecting well, a high-power water pump is arranged in the water collecting tank, and a drainage pipe of the high-power water pump is communicated with the ground surface.
Furthermore, in the pumping drainage structure, the height of the groove, the width of the bottom surface of the groove and the slope ratio of the wall of the groove are set according to the depth of the foundation pit, the area of the bottom plate of the foundation pit, the water pressure of the bottom plate of the foundation pit and drainage requirements.
The height of the groove is 400mm, the width of the bottom surface of the groove is 400mm, and the slope ratio of the groove wall is 1: 0.3.
When the construction of the foundation pit structure is implemented, the obvious water seepage position is met, and the flowing route of the blind ditch extends to the position.
Compared with the prior art, the invention has the beneficial effects that:
the invention has the advantage of providing a method which can effectively solve the problem of pumping water from the deep foundation pit bottom plate of the strongly weathered permeable stratum. The invention has good water pumping effect and controllable water leakage. The method can be applied to pumping construction of deep foundation pit bottom plates in geological structures and surrounding construction environments which are complex and contain abundant underground water strata such as stratums of strongly weathered permeable fracture zones so as to ensure that bottom pouring is carried out smoothly. Simple structure, construction flow is simple and easy, and it is effectual to pump water.
Drawings
Fig. 1 is a sectional view of a foundation pit (or working well) involved in the present invention;
FIG. 2 is a plan layout view of blind trench grooves of a foundation pit (or a working well) bottom plate in the invention;
fig. 3 is a cross-sectional view of the blind trench of fig. 2.
In the figure: the method comprises the following steps of 1-underground continuous wall, 2-stratum, 3-foundation pit bottom plate, 4-concrete cushion, 5-blind ditch, 51-circumferential groove, 52-radial groove, 6-water collecting well, 7-water collecting tank, 8-high-power water pump, 9-water pump, 10-water discharging pipe, 11-sand-stone mixture and 12-bar planting.
Detailed Description
The design idea of the invention is as follows: in order to be applicable to the drainage of strong weathering permeable fracture zone stratum deep basal pit bottom plate construction, the drainage structure of design mainly considers: blind ditches with trapezoidal cross sections, sandstone fillers and concrete cushions. The trapezoidal blind ditch is a drainage ditch with a pre-dug trapezoidal section, the blind ditch is formed by grooves which are arranged annularly and radially, the annularly-arranged grooves are connected with each other through the radially-arranged grooves, so that a through drainage channel is formed, underground water is gathered in a water collecting well during the pumping and drainage working period and temporarily stored in a water collecting tank, and the requirement of the high-power water pump for intermittent pumping is met; gravel and coarse sand with the ratio of 2:1 are selected and filled in the blind ditch to support the shape of the blind ditch and prolong the service life of the blind ditch; and covering a concrete cushion layer on the top of the blind ditch, and carrying out the processes of planting bars and pouring on the bottom plate of the foundation pit of the deep foundation pit above the cushion layer. During construction, the large water pressure at the bottom of the deep foundation pit is drained through the arranged blind ditch, so that the pouring of the bottom plate of the deep foundation pit is facilitated; during the service period, the blind ditch can reduce the great water pressure that deep basal pit foundation ditch bottom plate probably bore. The invention has the advantages of simple structure and convenient construction, and meets the waterproof requirement of the foundation pit bottom plate of the deep foundation pit.
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
The invention provides a pumping drainage method for deep foundation pit bottom plate construction, wherein a blind ditch structure is adopted as a water conservancy channel in a pumping drainage structure, so that the pumping drainage structure is suitable for pumping drainage of a deep foundation pit bottom plate of a stratum deep foundation pit in a strongly weathered permeable fracture zone, the pumping drainage structure is positioned in an underground continuous wall 1 and above a stratum 2 and comprises a blind ditch 5 arranged at the bottom of a concrete cushion 4 below a foundation pit bottom plate 3 and a water collecting well 6 communicated with the blind ditch 5 from the foundation pit bottom plate 3 downwards, the structure and the plane arrangement of the blind ditch 5 are shown in figure 2, the blind ditch 5 comprises a plurality of annular grooves 51 arranged concentrically and a plurality of radial grooves 52 radially penetrating through the annular grooves 51 from the center, and the cross sections of the annular grooves 51 and the radial grooves 52 are trapezoids with wide top and narrow bottom, as shown in figure 3; and setting the height of the groove, the width of the bottom surface of the groove and the slope ratio of the groove wall according to the depth of the foundation pit, the area of the bottom plate of the foundation pit, the water pressure of the bottom plate of the foundation pit and the drainage requirement. In the embodiment, the height of the groove is 400mm, the width of the bottom surface of the groove is 400mm, and the slope ratio of the groove wall is 1: 0.3; in the construction of implementing the foundation pit structure, if the obvious infiltration department meets, extend the route of flowing through of french drain 5 here to receive better effect. The sump 6 in the pumping arrangement is arranged at the intersection of one of the radial grooves 52 and one of the circumferential grooves 51, as shown in fig. 2. The pumping and drainage structure further comprises a water collecting tank 7 arranged on the foundation pit bottom plate 3 and a water pump 9 arranged in the water collecting well 6, wherein a high-power water pump 8 is arranged in the water collecting tank 7, and a drainage pipe 10 of the high-power water pump 8 is communicated with the ground surface.
The step of using the pumping drainage structure for pumping drainage of the foundation pit bottom plate of the strongly weathered permeable fractured zone stratum deep foundation pit of the embodiment is as follows:
firstly, before construction, workers must carry out detailed research on geological data and hydrological data in the construction range of a foundation pit working well, determine the underground water level according to the geological data and the hydrological data in the construction range of the foundation pit, calculate the underground water pressure, formulate the drainage requirement and determine the design parameters of the foundation pit such as the depth of the foundation pit, the floor area of the foundation pit and the like; designing the proportion of broken stones and coarse sand in the sand-stone mixture 11 for backfilling the blind ditch according to the determined underground water level and the drainage requirement; reasonably designing an arrangement mode, a connection mode, a groove height, a groove bottom surface width and a groove wall slope ratio of the blind ditch according to the depth of the foundation pit, the area of a foundation pit bottom plate, the water pressure of the foundation pit bottom plate and the drainage requirement; the thickness and the number of the concrete cushion layer 4 are set according to the size of the blind ditch, the underground water pressure and the drainage requirement, wherein the size of the blind ditch comprises the height of the ditch, the width of the bottom surface of the ditch and the slope ratio of the walls of the ditch.
Step two, implementing the construction of the foundation pit structure, namely constructing to the process before the foundation pit bottom plate 3;
thirdly, completing the blind ditch construction of the following structure by adopting mechanical equipment operation: as shown in fig. 2 and 3, the blind trench 5 includes 4 circumferential grooves 51 arranged concentrically and 4 radial grooves 52 radially extending from the center and penetrating through the 4 circumferential grooves 51, the distances between the circumferential grooves 51 and between the radial grooves 52 can be set reasonably according to the drainage requirement, and the radii of the 4 circumferential grooves 51 are 3m, 6m, 10m and 14m from inside to outside in sequence. The 4 radial grooves may be arranged at 90 ° intervals. The grooves are preset on the surface of the strongly weathered permeable layer, all the circumferential grooves are connected by the radial grooves 52 to form a complete hydraulic channel, and if an obvious water seepage position is met in the excavation process, the flowing route of the grooves is extended to the position; after the grooves are constructed, backfilling gravel mixture 11 into the annular grooves 51 and the radial grooves 52, wherein the mass ratio of crushed stones to coarse sand in the gravel mixture 11 is 2:1, reserving hole sites of a water collecting well 6 at the junction of one radial groove 52 and one annular groove 51 in the backfilling process, and the water collecting well 6 is used for collecting water flow gathered by the blind ditches 5; after backfilling, a concrete cushion layer 4 with preset thickness and strength is laid on the upper portion, and the concrete cushion layer 4 can be used for isolating water flow and guaranteeing pouring and normal operation of a working well bottom plate.
Step four, as shown in figure 1,after the strength of the concrete cushion 4 meets the requirement, the steel bar planting 12 and the pouring of the foundation pit bottom plate 3 are started, and the position of the water collecting well 6 is reserved; the header tank 7 is arranged for storing the ground water drained by the collector well 6, the volume of said header tank 7 being typically set according to the water output. If the water yield isqAccording to the target timetSetting the volume of the water collection tankV = qt。
Fifthly, in the process of planting the ribs 12 and pouring on the foundation pit bottom plate 3, the water collecting well 6 collects the underground water drained by the blind ditch 5, the water is conveyed to the water collecting tank 7 from the water collecting well 6 through the water pump 9, the underground water is conveyed to the ground surface from the water collecting tank 7 along the drain pipe 10 of the high-power water pump 8 periodically through the high-power water pump 8, and therefore the influence of the underground water on the foundation pit bottom plate 3 is reduced, and particularly the influence of the underground water on concrete pouring of a deeper working bottom plate in a strongly weathered permeable stratum is reduced.
The drainage structure and the drainage method have the advantages that the blind ditch structure is adopted, the structure is simple, the construction is convenient, the requirements of pumping water from a highly weathered permeable stratum and concrete pouring of a deep foundation pit deep working well bottom plate are met, and the construction effect and the construction safety are ensured.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (9)
1. A pumping and drainage method for deep foundation pit bottom plate construction is characterized in that a water conservancy channel with a blind ditch structure is used for pumping and drainage of a deep foundation pit bottom plate of a strongly weathered permeable fractured zone stratum; the method comprises the following steps:
step one, before construction:
determining the underground water level according to geological data and hydrological data in the foundation pit construction range, calculating the underground water pressure, and formulating the drainage requirement;
designing the proportion of broken stones and coarse sand in the sand-stone mixture (11) for backfilling the blind ditch according to the determined underground water level and the drainage requirement;
setting the groove height, the groove bottom surface width and the groove wall slope ratio of the blind groove according to the depth of the foundation pit, the area of the foundation pit bottom plate, the water pressure of the foundation pit bottom plate and the drainage requirement;
setting the thickness of a concrete cushion (4) and a used cement label according to the size of a blind ditch, the underground water pressure and the drainage requirement, wherein the size of the blind ditch comprises the height of the ditch, the bottom surface width of the ditch and the slope ratio of the walls of the ditch;
step two, implementing the construction of the foundation pit structure, namely constructing to the process before the foundation pit bottom plate (3);
thirdly, completing the blind ditch construction of the following structure by adopting mechanical equipment operation: the blind ditch (5) is composed of a plurality of annular grooves (51) which are concentrically arranged and a plurality of radial grooves (52) which are radial according to the center and penetrate through the annular grooves (51), after sand and stone mixture (11) is backfilled in the annular grooves (51) and the radial grooves (52), a concrete cushion layer (4) with preset thickness and strength is paved at the upper part, and a hole site of a water collecting well (6) is reserved at the junction of one radial groove (52) and one annular groove (51);
fourthly, after the strength of the concrete cushion (4) meets the requirement, planting bars (12) and pouring of the foundation pit bottom plate (3) are started, and meanwhile, the position of the water collecting well (6) is reserved; a water collecting tank (7) is arranged for storing the underground water drained by the water collecting well (6);
fifthly, in the process of planting the ribs (12) and pouring on the foundation pit bottom plate (3), the water collecting well (6) collects the underground water drained by the blind ditch (5), the water is conveyed to the water collecting tank (7) from the water collecting well (6) through the water pump (9), and the underground water is conveyed to the ground surface from the water collecting tank (7) along the drain pipe (10) of the high-power water pump (8) through the high-power water pump (8) periodically.
2. The pumping and drainage method for construction of the bottom plate of the deep foundation pit and the foundation pit as claimed in claim 1, wherein the mass ratio of the crushed stone to the coarse sand in the sand-stone mixture (11) is 2: 1.
3. The pumping and drainage method for the construction of the bottom plate of the deep foundation pit according to claim 1, wherein the cross section of the circumferential groove (51) and the cross section of the radial groove (52) are both trapezoids with the upper part being wide and the lower part being narrow; the height of the groove is 400mm, the width of the bottom surface of the groove is 400mm, and the slope ratio of the groove wall is 1: 0.3.
4. The method for pumping and draining water for construction of a bottom plate of a deep foundation pit according to claim 1, wherein the concrete pad (4) is a C15 concrete layer with a reference thickness of 100 mm.
5. The pumping and drainage method for the construction of the bottom plate of the deep foundation pit according to claim 1, characterized in that the volume of the water collecting tank (7) is set according to the water yield.
6. The drainage structure for realizing the drainage method for the construction of the deep foundation pit base plate of any one of claims 1 to 5, comprising a blind ditch (5) arranged at the bottom of a concrete cushion (4) below the foundation pit base plate (3) and a water collecting well (6) which is communicated with the blind ditch (5) from the foundation pit base plate (3) downwards, and is characterized in that the blind ditch (5) comprises a plurality of annular grooves (51) which are concentrically arranged and a plurality of radial grooves (52) which are radial according to the center and penetrate through the plurality of annular grooves (51), the cross sections of the annular grooves (51) and the radial grooves (52) are trapezoids with wide upper parts and narrow lower parts, and gravel mixtures (11) are backfilled in the annular grooves (51) and the radial grooves (52); the water collecting well (6) is arranged at the intersection of one radial groove (52) and one circumferential groove (51), the water pumping and draining structure further comprises a water collecting tank (7) arranged on the foundation pit bottom plate (3) and a water pump (9) arranged in the water collecting well (6), a high-power water pump (8) is arranged in the water collecting tank (7), and a water draining pipe (10) of the high-power water pump (8) leads to the ground surface.
7. A pumping and drainage structure according to claim 6, wherein the groove height, the groove bottom surface width and the groove wall slope ratio are set according to the foundation pit depth, the foundation pit bottom plate area, the foundation pit bottom plate water pressure and the drainage requirements.
8. The pump drainage structure according to claim 7, wherein the groove height is 400mm, the groove bottom surface width is 400mm, and the groove wall slope ratio is 1: 0.3.
9. A drainage arrangement according to claim 6, wherein the blind ditch (5) runs along a route extending from a point where significant water penetration is encountered during construction of the foundation pit structure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111024454.9A CN113463670A (en) | 2021-09-02 | 2021-09-02 | Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction |
| LU501539A LU501539B1 (en) | 2021-09-02 | 2022-02-23 | Pumping and drainage method for foundation pit bottom plate construction of deep foundation pit and pumping and drainage structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111024454.9A CN113463670A (en) | 2021-09-02 | 2021-09-02 | Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction |
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| CN113463670A true CN113463670A (en) | 2021-10-01 |
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| CN (1) | CN113463670A (en) |
| LU (1) | LU501539B1 (en) |
Cited By (4)
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| CN116254862A (en) * | 2023-03-14 | 2023-06-13 | 中建八局第三建设有限公司 | Foundation pit drainage system combined with deep foundation pit inner support |
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| CN115419093A (en) * | 2022-09-26 | 2022-12-02 | 中建港航局集团有限公司 | Bottom plate construction method during piping of deep foundation pit with underwater channel interface |
| CN116791647B (en) * | 2023-08-23 | 2023-12-01 | 华侨大学 | Foundation pit dewatering device and use method thereof |
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| CN114753415A (en) * | 2022-04-07 | 2022-07-15 | 中铁隧道局集团有限公司 | Water collecting and draining device and method applied to deep-buried open-cut foundation pit |
| CN115354704A (en) * | 2022-08-11 | 2022-11-18 | 中国水利水电第十一工程局有限公司 | Grooving treatment method for plain wind field fan foundation karst foundation water seepage |
| CN115354704B (en) * | 2022-08-11 | 2023-11-03 | 中国水利水电第十一工程局有限公司 | Water seepage grooving treatment method for karst foundation of fan foundation of plain wind farm |
| CN116254862A (en) * | 2023-03-14 | 2023-06-13 | 中建八局第三建设有限公司 | Foundation pit drainage system combined with deep foundation pit inner support |
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