CN112049136B - Foundation pit drainage device - Google Patents
Foundation pit drainage device Download PDFInfo
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- CN112049136B CN112049136B CN202010718821.4A CN202010718821A CN112049136B CN 112049136 B CN112049136 B CN 112049136B CN 202010718821 A CN202010718821 A CN 202010718821A CN 112049136 B CN112049136 B CN 112049136B
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- grouting
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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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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to a foundation ditch drainage device relates to construction's field, and it is including locating the blind ditch of foundation ditch inner wall department all around, lay the various strip cloth of blind ditch upside, pour in the bed course of various strip cloth upside, locate the foundation ditch bottom and with the sump pit that communicates mutually, the one end is pegged graft on the foundation ditch lateral wall the other end passes the bed course in proper order and the water collecting pipe that various strip cloth extended to the blind pit in, locate the water pump in the foundation ditch outside and the drinking-water pipe that the other end is connected with the sump pit with the water pump, the bottom of foundation ditch is located to the blind pit. This application has and makes water be difficult for oozing from the bed course end, has reduced groundwater to pouring structure's influence, has improved the quality of follow-up construction of pouring, has reduced the appearance of repeated pouring simultaneously, has practiced thrift pouring raw materials, the effect of more energy-concerving and environment-protective.
Description
Technical Field
The application relates to the field of building construction, in particular to a foundation pit drainage device.
Background
The measures of soil retaining structure, underground water control, environmental protection and the like required for ensuring the safety and stability of the underground space formed by downward excavation of the ground during the construction of the underground structure are called foundation pit engineering. The foundation pit engineering is a system engineering integrating geological engineering, geotechnical engineering, structural engineering and geotechnical testing technology, and mainly comprises the following steps: engineering investigation, supporting structure design and construction, earth excavation and backfilling, underground water control, information construction, surrounding environment protection and the like.
In the related art, open trenches are dug in a foundation pit for drainage, but the open trenches occupy a construction surface, and for subsequent construction, the open trenches are buried when a cushion layer is poured, so that a water head of underground water at the bottom of the cushion layer rises, water seeps out from the bottom of the cushion layer, and the subsequent construction quality is affected.
Disclosure of Invention
In order to make water be difficult for oozing at the bottom of the bed course, this application provides a foundation ditch drainage device.
The application provides a foundation ditch drainage device adopts following technical scheme:
the utility model provides a foundation pit drainage device, is including locating the blind ditch of foundation pit inner wall department all around, laying the various strip cloth of blind ditch upside, pour in the bed course of various strip cloth upside, locate the foundation pit bottom and with the sump pit that communicates mutually, one end is pegged graft on the foundation pit lateral wall the other end passes bed course and various strip cloth in proper order and extends to the sump pit in the header pipe, locate the water pump in the foundation pit outside and the drinking-water pipe that the other end is connected with the sump pit with the water pump connection of one end, the bottom of foundation pit is located to the blind pit.
Through adopting above-mentioned technical scheme for after pouring the bed course, still can collect the groundwater near the foundation ditch through french drain and water collection well, and discharge the water in with the sump pit through the water pump, make water be difficult for oozing at the bottom of the bed course, reduced groundwater to pouring structure's influence, improved the quality of follow-up construction of pouring, reduced the appearance of repeated pouring simultaneously, practiced thrift and pour the raw materials, it is more energy-concerving and environment-protective.
Preferably, a reinforcing cylinder abutting against the inner side wall of the water collecting well is fixed in the water collecting well.
Through adopting above-mentioned technical scheme, the setting of consolidating a section of thick bamboo is consolidated the sump pit, makes the sump pit be difficult for collapsing at the in-process that uses.
Preferably, a gravel water filtering layer is paved at the bottom of the water collecting well.
Through adopting above-mentioned technical scheme, rubble drainage layer filters the groundwater in the sump pit to reduce the carrying capacity of groundwater silt when the water pump is discharged, cushion the suction force of water pump simultaneously, reduced the loss of sump pit bottom silt.
Preferably, the other end of the water pumping pipe is provided with a grouting assembly, the grouting assembly comprises a first grouting pipe connected with the other end of the water pumping pipe and a second grouting pipe sleeved outside the first grouting pipe, one end, far away from the water pumping pipe, of the first grouting pipe sequentially penetrates through the cushion layer and the color stripe cloth and extends to the bottom of the water collecting well, the second grouting pipe is rotatably connected with the first grouting pipe, the inner side wall of the second grouting pipe is abutted against the outer side wall of the first grouting pipe, the side wall, far away from the water pumping pipe, of the first grouting pipe is provided with a plurality of first grouting holes, and the side wall of the second grouting pipe is provided with second grouting holes corresponding to the first grouting holes one to one;
when the water pump pumps water, the first grouting holes and the second grouting holes are arranged in a staggered mode; during grouting, the first grouting hole is communicated with the second grouting hole.
Through adopting above-mentioned technical scheme, first slip casting pipe can also be used as the slip casting pipe in the later stage with second slip casting pipe cooperation earlier stage, and a pipe is multi-purpose, has simplified the construction of burying underground of water pipe, has improved the efficiency of construction, simultaneously rational utilization the resource, energy-concerving and environment-protective.
Preferably, the first slip casting pipe is fixed with the butt ring with the butt of second slip casting pipe upper end on being close to the lateral wall of drinking-water pipe, the butt ring is fixed with the spacing section of thick bamboo that the cover was located the second slip casting outside near one side of second slip casting pipe.
By adopting the technical scheme, the abutting ring limits the first grouting pipe, so that the first grouting pipe and the second grouting pipe are not easy to slide in the axial direction, and the stability of the first grouting pipe and the second grouting pipe in use is improved; spacing section of thick bamboo carries on spacingly to the second slip casting pipe, makes the second slip casting pipe be difficult for taking place relative rocking with first slip casting pipe, has improved the stability when first slip casting pipe and second slip casting pipe use.
Preferably, be equipped with the shell fragment on the lateral wall of a spacing section of thick bamboo, the both ends of shell fragment are fixed with the lateral wall of a spacing section of thick bamboo, the middle part an organic whole of shell fragment is equipped with and sets up the beans of jumping towards one side of a spacing section of thick bamboo, be equipped with the hole of wearing to establish that supplies to jump the beans to wear to establish on the spacing section of thick bamboo, be equipped with two at least locking holes that supply to jump the beans and insert the locking on the lateral wall that the second slip casting pipe is close to the butt joint ring.
Through adopting above-mentioned technical scheme, first slip casting pipe inserts the locking hole through jumping the beans with the second slip casting pipe and locks, makes first slip casting pipe and second slip casting pipe be difficult for taking place relative rotation when using, has improved the stability when first slip casting pipe and second slip casting pipe use.
Preferably, still including locating the observation ditch of foundation ditch bottom, it is closed loop setting to observe the ditch, observe the ditch and locate one side that the foundation ditch inside wall was kept away from to the french drain.
By adopting the technical scheme, the arrangement of the observation trench is convenient for constructors to know the underground water condition inside the foundation pit through the observation trench so as to discharge the underground water inside the foundation pit in time, and the influence of the underground water inside the foundation pit on the pouring construction quality is reduced; meanwhile, the water storage effect is achieved to a certain degree, the influence of underground water on pouring construction can be relieved to a certain degree, and the quality of pouring construction in the foundation pit is improved.
Preferably, the bottom of the observation trench is provided with a plurality of humidity sensors.
Through adopting above-mentioned technical scheme, humidity transducer detects the humidity of observing the ditch to realize the automatic control of water pump, and need not artifical on duty, reduced constructor's intensity of labour.
Preferably, the observation trench has a trench bottom higher than a trench bottom of the blind trench.
Preferably, the bottom of the blind ditch is arranged obliquely downwards from the direction far away from the water collecting well to the direction close to the water collecting well.
Through adopting above-mentioned technical scheme for groundwater in the french drain can be to the direction gathering of being close to the sump pit, and then conveniently discharges the groundwater in the foundation ditch through the water pump in the sump pit.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the influence of underground water on the pouring structure is reduced, the quality of subsequent pouring construction is improved, the occurrence of repeated pouring is reduced, pouring raw materials are saved, and the method is more energy-saving and environment-friendly;
2. the observation ditch makes things convenient for constructor to know the inside groundwater condition of foundation ditch through observing the ditch, still plays certain retaining effect simultaneously, can alleviate groundwater to a certain extent and pour the influence of construction.
Drawings
Fig. 1 is a schematic structural diagram of a foundation pit drainage device according to an embodiment of the present application.
Fig. 2 is a partial sectional view of a drainage device for a foundation pit according to an embodiment of the present disclosure.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic structural diagram of a grouting assembly according to an embodiment of the application.
Fig. 5 is an enlarged view of a portion B in fig. 4.
Fig. 6 is a schematic diagram of a partial explosion of the first grouting pipe, the second grouting pipe, and the elastic sheet according to the embodiment of the present application.
Description of reference numerals: 1. a foundation pit; 2. blind ditches; 3. color stripe cloth; 4. a cushion layer; 5. a water collecting well; 51. a reinforcement cylinder; 52. a water filtering layer for breaking stones; 6. a water collection pipe; 7. a water pump; 71. a filter screen; 8. a water pumping pipe; 9. observing the ditch; 91. a humidity sensor; 10. a grouting component; 101. a first grouting pipe; 1011. a first grouting hole; 1012. a butting ring; 1013. a limiting cylinder; 1014. perforating holes; 102. a second grouting pipe; 1021. a second grouting hole; 1022. a locking hole; 103. a spring plate; 1031. jumping the beans.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses foundation ditch 1 drainage device. Referring to fig. 1 and 2, the drainage device of the foundation pit 1 comprises a blind ditch 2, colored cloth strips, a cushion layer 4, a water collecting pipe 6, a water pump 7 and a water pumping pipe 8.
Referring to fig. 2 and 3, the blind ditch 2 is arranged at the bottom of the foundation pit 1, the blind ditch 2 is dug along the edge of the bottom of the foundation pit 1, the blind ditch 2 is arranged in a closed loop, and cobblestones are laid in the blind ditch 2 to filter underground water and reinforce the bottom of the blind ditch 2; colored cloth strips are laid at the bottom of the foundation pit 1 and cover the upper side of the foundation pit 1, a cushion layer 4 is poured on the upper side of the colored cloth strips, and the cushion layer 4 is formed by pouring concrete; the quantity of collector pipe 6 is a plurality of, collector pipe 6 evenly distributed is on four inside walls of foundation ditch 1, the quantity of collector pipe 6 can carry out the design according to foundation ditch 1's size and select, collector pipe 6 is "L" shape setting, the one end of collector pipe 6 is the level setting and pegs graft on foundation ditch 1's inside wall, the other end of collector pipe 6 is vertical setting and passes bed course 4 and various cloth strip in proper order and extend to in french drain 2, in order to assemble the groundwater near foundation ditch 1 lateral wall in french drain 2.
A water collecting well 5 is dug in the foundation pit 1, the water collecting well 5 is communicated with the blind ditch 2, and the ditch bottom of the blind ditch 2 is gradually decreased from one side far away from the water collecting well 5 to one side close to the water collecting well 5, so that the underground water in the blind ditch 2 is conveniently gathered in the water collecting well 5; the water pump 7 is arranged on the outer side of the foundation pit 1, one end of the water pumping pipe 8 is connected with the water pump 7, and the other end extends into the water collecting well 5, so that underground water in the water collecting well 5 and the blind ditch 2 is discharged through the water pump 7; a reinforcing cylinder 51 is embedded in the water collecting well 5, and the outer side wall of the reinforcing cylinder 51 is mutually attached to the inner side wall of the water collecting well 5, so that the water collecting well 5 is not easy to collapse; the bottom of the water collecting well 5 is also paved with a gravel water filtering layer 52 to filter the underground water and reduce the silt carrying amount of the discharged underground water.
An observation ditch 9 is also dug at the bottom of the foundation pit 1, the observation ditch 9 sequentially penetrates through the cushion layer 4 and the color strip cloth 3, the observation ditch 9 is arranged in a closed loop mode, the observation ditch 9 is arranged at one side of the blind ditch 2, which is far away from the inner side wall of the foundation pit 1, constructors can observe the ditch 9 to judge the condition of underground water in the blind ditch 2, and then the operation of the water pump 7 is controlled; the bottom of observing ditch 9 still is equipped with a plurality of humidity transducer 91 to detect the humidity of observing ditch 9 bottom soil, realized the automatic monitoring of the interior water yield of french drain 2, the ditch bottom of observing ditch 9 is higher than the ditch bottom of french drain 2.
Referring to fig. 2 and 4, the grouting assembly 10 further comprises a grouting assembly 10, the grouting assembly 10 comprises a first grouting pipe 101 and a second grouting pipe 102, the second grouting pipe 102 sequentially penetrates through the cushion layer 4 and the color stripe cloth 3 and extends to the bottom of the water collecting well 5, the second grouting pipe 102 is fixedly connected with the cushion layer 4, the first grouting pipe 101 penetrates through the second grouting pipe 102 and is rotatably connected with the second grouting pipe 102, the outer diameter of the first grouting pipe 101 is equal to the inner diameter of the second grouting pipe 102, one end of the water pumping pipe 8, which is far away from the water pump 7, is sleeved on the upper end of the first grouting pipe 101, and the water pumping pipe 8 is fixed with the first grouting pipe 101 through a hoop.
Referring to fig. 4 and 5, a plurality of first grouting holes 1011 are formed in the lower side wall of the first grouting pipe 101, the first grouting holes 1011 penetrate through the side wall of the first grouting pipe 101, the first grouting holes 1011 are uniformly distributed on the lower side wall of the first grouting pipe 101, a second grouting hole 1021 is formed in the second grouting pipe 102, the second grouting holes 1021 penetrate through the side wall of the second grouting pipe 102, the second grouting holes 1021 correspond to the first grouting holes 1011 one by one, and the diameters of the second grouting holes 1021 and the first grouting holes 1011 are equal; during drainage, the first grouting pipe 101 is rotated to enable the first grouting hole 1011 and the second grouting hole 1021 to be staggered, and the grouting assembly 10 can be used as a water pipe; when the water collecting well 5 is closed, the water pumping pipe 8 is pulled out of the first grouting pipe 101, the first grouting pipe 101 is rotated, the first grouting hole 1011 and the second grouting hole 1021 are communicated with each other, grouting can be performed through the grouting assembly 10, and the water collecting well 5 is closed.
Referring to fig. 6, the outer sidewall of the first grouting pipe 101 is further welded with an abutting ring 1012, and the abutting ring 1012 abuts against the upper end surface of the second grouting pipe 102, so that the first grouting pipe 101 and the second grouting pipe 102 are not easy to slide relatively in the axial direction; one side of the abutting ring 1012, which is close to the second grouting pipe 102, is integrally provided with a limiting cylinder 1013, and the limiting cylinder 1013 abuts against the outer side wall of the second grouting pipe 102, so that the first grouting pipe 101 and the second grouting pipe 102 are not prone to relative shaking; the outer side wall of the limiting cylinder 1013 is further fixed with a spring plate 103, two ends of the spring plate 103 are fixed with the outer side wall of the limiting cylinder 1013, one side of the spring plate 103 close to the limiting cylinder 1013 is integrally provided with a bean-jumping 1031, the outer side wall of the limiting cylinder 1013 is provided with a through hole 1014, the through hole 1014 penetrates through the side wall of the limiting cylinder 1013, the through hole 1014 is provided for the bean-jumping 1031 to penetrate through, the outer side wall of the second grouting pipe 102 close to the abutting ring 1012 is provided with at least two locking holes 1022, the locking holes 1022 are provided for the bean-jumping 1031 to be inserted into so as to lock the limiting cylinder 1013 on the second grouting pipe 102, the number of the locking holes 1022 is preferably two, when the bean-jumping 1031 is inserted into one of the locking holes 1022, the first grouting hole 1011 and the second grouting hole 1021 are mutually communicated, and when the bean-jumping 1031 is inserted into the other locking hole 1022, the first grouting hole 1011 and the second grouting hole 1021 are arranged in a staggered manner.
The implementation principle of a foundation pit 1 drainage device in the embodiment of the application is as follows: after the cushion layer 4 is poured, the blind ditch 2 can still collect underground water near the foundation pit 1 through the blind ditch 2 and the water collecting well 5, and water in the water collecting well 5 is discharged through the water pump 7, so that the influence of the underground water on a pouring structure is reduced, the quality of subsequent pouring construction is improved, the occurrence of repeated pouring is reduced, pouring raw materials are saved, and the cushion layer is more energy-saving and environment-friendly; the observation ditch 9 is arranged, so that the underground water quantity in the blind ditch 2 and the foundation pit 1 can be conveniently judged through the observation ditch 9, the opening and closing of the water pump 7 can be conveniently controlled, meanwhile, the observation ditch 9 can also play a certain water storage role, and the influence of the underground water on the pouring construction can be relieved to a certain extent; the grouting assembly 10 can serve as a water pipe for drainage and also can serve as a grouting pipe for sealing the water collecting well 5, so that construction is simplified, and construction efficiency is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a foundation ditch drainage device which characterized in that: the water-saving foundation pit comprises a blind ditch (2) arranged on the inner wall of the periphery of a foundation pit (1), color strip cloth (3) laid on the upper side of the blind ditch (2), a cushion layer (4) poured on the upper side of the color strip cloth (3), a water collecting well (5) arranged at the bottom of the foundation pit (1) and communicated with the blind ditch (2), a water collecting pipe (6) with one end inserted on the side wall of the foundation pit (1) and the other end sequentially penetrating through the cushion layer (4) and the color strip cloth (3) and extending into the blind ditch (2), a water pump (7) arranged on the outer side of the foundation pit (1) and a water pumping pipe (8) with one end connected with the water pump (7) and the other end connected with the water collecting well (5), wherein the blind ditch (2) is arranged at the bottom of the foundation pit (1);
the other end of the water pumping pipe (8) is provided with a grouting component (10), the grouting component (10) comprises a first grouting pipe (101) connected with the other end of the water pumping pipe (8) and a second grouting pipe (102) sleeved outside the first grouting pipe (101), one end of the first grouting pipe (101) far away from the water pumping pipe (8) sequentially penetrates through the cushion layer (4) and the color stripe cloth (3) and extends to the bottom of the water collecting well (5), the second grouting pipe (102) is rotatably connected with the first grouting pipe (101), the inner side wall of the second grouting pipe (102) is abutted against the outer side wall of the first grouting pipe (101), a plurality of first grouting holes (1011) are formed in the side wall of the first grouting pipe (101) far away from the water pumping pipe (8), second grouting holes (1021) which correspond to the first grouting holes (1011) one by one are formed in the side wall of the second grouting pipe (102);
when the water pump (7) pumps water, the first grouting hole (1011) and the second grouting hole (1021) are arranged in a staggered mode; during grouting, the first grouting hole (1011) and the second grouting hole (1021) are communicated with each other;
an abutting ring (1012) abutted against the upper end of the second grouting pipe (102) is fixed on the outer side wall of the first grouting pipe (101) close to the water pumping pipe (8), and a limiting cylinder (1013) sleeved on the outer side of the second grouting pipe (102) is fixed on one side of the abutting ring (1012) close to the second grouting pipe (102);
be equipped with shell fragment (103) on the lateral wall of spacing section of thick bamboo (1013), the both ends of shell fragment (103) are fixed with the lateral wall of spacing section of thick bamboo (1013), the middle part an organic whole of shell fragment (103) is equipped with one side towards spacing section of thick bamboo (1013) and sets up jumping beans (1031), be equipped with on spacing section of thick bamboo (1013) and supply to jump beans (1031) wear to establish hole (1014), second slip casting pipe (102) are equipped with two and supply to jump beans (1031) to insert locking hole (1022) of locking on being close to the lateral wall of butt ring (1012) to lock spacing section of thick bamboo (1013) on second slip casting pipe (102), when jumping beans (1031) insert one of them locking hole (1022), first slip casting hole (1011) and second slip casting hole (1021) communicate mutually, when jumping beans (1031) insert in another locking hole (1022), first slip casting hole (1011) and second slip casting hole (1021) are the setting of staggering.
2. A foundation pit drainage device according to claim 1, wherein: and a reinforcing cylinder (51) which is abutted against the inner side wall of the water collecting well (5) is fixed in the water collecting well (5).
3. A foundation pit drainage device according to claim 2, wherein: and a gravel water filtering layer (52) is paved at the bottom of the water collecting well (5).
4. A foundation pit drainage device according to claim 1, wherein: still including observing ditch (9) of locating foundation ditch (1) bottom, it is the closed loop setting to observe ditch (9), observe ditch (9) and locate one side that foundation ditch (1) inside wall was kept away from in french drain (2).
5. A foundation pit drainage device according to claim 4, wherein: the bottom of the observation ditch (9) is provided with a plurality of humidity sensors (91).
6. A foundation pit drainage device according to claim 5, wherein: the bottom of the observation trench (9) is higher than that of the blind trench (2).
7. A foundation pit drainage device according to claim 1, wherein: the bottom of the blind ditch (2) is arranged obliquely downwards from a direction far away from the water collecting well (5) to a direction close to the water collecting well (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718821.4A CN112049136B (en) | 2020-07-23 | 2020-07-23 | Foundation pit drainage device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718821.4A CN112049136B (en) | 2020-07-23 | 2020-07-23 | Foundation pit drainage device |
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| CN112049136A CN112049136A (en) | 2020-12-08 |
| CN112049136B true CN112049136B (en) | 2021-12-10 |
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| CN202010718821.4A Active CN112049136B (en) | 2020-07-23 | 2020-07-23 | Foundation pit drainage device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288173A (en) * | 2022-09-13 | 2022-11-04 | 中国五冶集团有限公司 | Foundation pit drainage system and method |
| CN115726401B (en) * | 2022-11-17 | 2023-09-12 | 广州机施建设集团有限公司 | Basement local anti-floating pressure relief structure and construction method thereof |
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| CN201679008U (en) * | 2010-04-09 | 2010-12-22 | 中国三冶集团有限公司建筑安装工程公司 | Rigid water drainage device for foundation pit |
| CN102418347A (en) * | 2011-09-27 | 2012-04-18 | 天津住宅集团建设工程总承包有限公司 | Drainage construction method for blind drain and sump wells in deep foundation pit |
| CN106088123A (en) * | 2016-08-16 | 2016-11-09 | 中国建筑第七工程局有限公司 | A kind of sand geology steel tube well fall water level device and construction method thereof |
| CN108221910A (en) * | 2018-01-22 | 2018-06-29 | 贵州省交通规划勘察设计研究院股份有限公司 | A kind of structure and method of center draining grouting concrete pile foundation stabilization |
| CN110700296A (en) * | 2019-09-27 | 2020-01-17 | 中国十七冶集团有限公司 | Foundation pit dewatering system with high water level and weak permeability soil and implementation method |
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2020
- 2020-07-23 CN CN202010718821.4A patent/CN112049136B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201679008U (en) * | 2010-04-09 | 2010-12-22 | 中国三冶集团有限公司建筑安装工程公司 | Rigid water drainage device for foundation pit |
| CN102418347A (en) * | 2011-09-27 | 2012-04-18 | 天津住宅集团建设工程总承包有限公司 | Drainage construction method for blind drain and sump wells in deep foundation pit |
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