CN114855813A - Foundation pit upper layer stagnant water precipitation slope support device and construction method - Google Patents
Foundation pit upper layer stagnant water precipitation slope support device and construction method Download PDFInfo
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- CN114855813A CN114855813A CN202210440020.5A CN202210440020A CN114855813A CN 114855813 A CN114855813 A CN 114855813A CN 202210440020 A CN202210440020 A CN 202210440020A CN 114855813 A CN114855813 A CN 114855813A
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/02—Combinations of filters of different kinds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention relates to the technical field of geotechnical foundation pit engineering, in particular to a foundation pit upper layer stagnant water precipitation slope supporting device and a construction method. The method comprises the following steps: the prefabricated module is rectangular and is provided with connecting ribs at the rear part; the connecting ribs comprise a plurality of cross rods which are equidistantly and transversely arranged and a plurality of vertical rods which are equidistantly and vertically arranged along the cross rods, two ends of each of the cross rods and the vertical rods are bent into arc shapes, the prefabricated module is provided with a plurality of drain holes, and two sides of each prefabricated module are provided with a plurality of through holes; a water discharge part including a power part, a connection pipe, and a water collection pipe; the upper layer stagnant water and precipitation slope supporting device and the construction method of the foundation pit are provided, the prefabricated modules are matched with the connecting ribs and fixed at the position of the stagnant water layer, the situation that a supporting structure collapses is effectively avoided, the water collecting pipes are obliquely arranged along the support, the water collecting pipes are respectively arranged in different lengths, and precipitation cost is reduced.
Description
Technical Field
The invention relates to the technical field of geotechnical foundation pit engineering, in particular to a foundation pit upper layer stagnant water precipitation slope supporting device and a construction method.
Background
With the rapid development of economic construction and the continuous improvement of urbanization level in China and the gradual increase of high-rise buildings, urban underground space is developed and utilized in large scale, along with more and more underground engineering construction, foundation pit excavation, supporting and precipitation are important processes in construction, and the influence of underground water on the excavation process of a foundation pit is generally reduced by foundation pit precipitation; in the foundation ditch excavation process, often there is the condition of upper strata stagnant water, when the stagnant water region shotcrete forms domatic supporting, because cement shaping speed is slower, often there is the risk of collapsing, current drainage system is vertical arrangement pipe well precipitation usually simultaneously to can't be according to actual precipitation demand in the precipitation, the work quantity of adjustment well point pipe, thereby arouse precipitation cost to increase, and traditional construction process is complicated, can't satisfy the construction demand.
Disclosure of Invention
Aiming at the technical defects, the invention provides a retaining and protecting device for the stagnant water and precipitation slope surface on the upper layer of the foundation pit and a construction method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a domatic supporting device of stagnant water precipitation in foundation ditch upper strata, includes:
the prefabricated module is rectangular and is provided with connecting ribs at the rear part;
the connecting ribs comprise a plurality of cross rods which are equidistantly and transversely arranged and a plurality of vertical rods which are equidistantly and vertically arranged along the cross rods, two ends of each of the cross rods and the vertical rods are bent into arc shapes, the prefabricated module is provided with a plurality of drain holes, and two sides of each prefabricated module are provided with a plurality of through holes;
a water discharge part including a power part, a connection pipe, and a water collection pipe; the water collecting pipes are connected with the power part through connecting pipes, the water collecting pipes are obliquely arranged at a fixed angle with the horizontal plane along the length direction of the slope surface support, and the lengths of the two adjacent water collecting pipes are different.
Preferably, the power part comprises a vacuum pump, a water collecting sedimentation tank and an external drainage main pipe which are connected in sequence, and the vacuum pump is connected with the connecting pipe.
Preferably, the water collecting pipe comprises a main pipe and a filter pipe; the main pipeline is connected with the filter pipe; the filter tube is provided with a plurality of quincunx inlet holes.
Preferably, the filter pipe part is sequentially sleeved with a spiral plastic pipe, a fine filter screen, a support frame, a coarse filter screen and an external protective net from inside to outside.
Preferably, a plurality of notches are formed in the plastic pipe.
Preferably, the lengths of two adjacent water collecting pipes are respectively 2.5 meters and 5 meters, and the distance between the two water collecting pipes is 1 meter.
Preferably, the two ends of the vertical rod exceed the height part of the prefabricated module, and the length of the exceeding part is 250 mm.
A construction method of a foundation pit upper layer stagnant water precipitation slope support device comprises the following steps:
the method comprises the following steps: finding out the geological condition of a foundation pit area, referring to geological data, arranging holes at large intervals, then performing local encrypted drilling to obtain corresponding parameters and reserving hydrological observation holes;
step two: determining well point hole sites according to the transverse span of the slope and corresponding parameters, and sequentially forming hole sites with different depths and horizontal included angles along the length direction of the slope from the top of an upper stagnant water layer to form a multi-point drainage area;
step three: sinking a water collecting pipe with a corresponding length according to the depth of the corresponding hole position, backfilling coarse sand filter materials into the hole position, and sealing the hole position with clay at the depth of 0.2-0.5 m;
step four: communicating the connecting pipe with the water collecting pipe, and extracting precipitation through the power part;
step five: after precipitation, the prefabricated modules are sequentially laid in the reserved upper water-retaining layer area and connected with the slope supporting structures which are pre-formed at the upper part and the lower part through the vertical rods;
step six: and continuously downwards excavating the foundation pit through the construction machinery and spraying the concrete support at the lower part to be connected and molded with the lower part of the prefabricated module.
Preferably, in the third step, before the water collecting pipe is sunk, a plurality of triangular supports are bound along the water collecting pipe in a segmented manner and slide into the hole positions to support the water collecting pipe.
Compared with the prior art, the invention has the following advantages: 1. the prefabricated modules and the connecting ribs are fixed through the through holes and are connected with a preset slope surface supporting structure through the connecting ribs, so that the problem that the traditional sprayed concrete is slow in forming and causes the collapse of the whole structure at a stagnant water layer is effectively avoided; 2. the water collecting pipes and the horizontal plane form different included angles to penetrate into the upper-layer stagnant water layer, and the water collecting pipes and the horizontal plane are matched with different pipe lengths, so that the whole body is divided into a plurality of water pumping areas, the precipitation mode can be adjusted, the targeted area precipitation is realized, the precipitation speed is improved, and the precipitation cost is saved; 3. the prefabricated module and the foundation pit support are effectively combined through a construction method, and the water collecting pipes are reasonably arranged, so that an expected precipitation effect is achieved, and slope support work is smoothly completed.
Drawings
FIG. 1 is a schematic structural diagram of prefabricated modules of a supporting device for a stagnant water and precipitation slope surface on the upper layer of a foundation pit and a construction method;
FIG. 2 is a front view of water collecting pipe distribution of a retaining and precipitation slope support device on the upper layer of a foundation pit and a construction method;
FIG. 3 is a schematic overall structure diagram of a retaining and protecting device for an upper layer stagnant water precipitation slope of a foundation pit and a construction method thereof;
FIG. 4 is a schematic view of a water collecting pipe structure of a retaining and precipitation slope supporting device on the upper layer of a foundation pit and a construction method;
fig. 5 is a schematic view of an external protective net structure of a foundation pit upper layer stagnant water precipitation slope supporting device and a construction method.
In the figure: 1. prefabricating a module; 2. connecting ribs; 3. a drainage member; 4. a power section; 5. a connecting pipe; 6. a water collection pipe; 101. a drain hole; 102. a through hole; 201. a cross bar; 202. a vertical rod; 401. a vacuum pump; 402. a water collecting sedimentation tank; 403. the external connection is a main drainage pipe; 601. a main pipeline; 602. a filter tube; 603. entering a hole; 604. a plastic tube; 605. a fine filter screen; 606. a support frame; 607. coarse filtration; 608. an external protective net; 609. and (4) a notch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows: referring to fig. 1-5, a slope supporting device for stagnant water and precipitation on the upper layer of a foundation pit is characterized by comprising:
the prefabricated module 1 is rectangular, and a connecting rib 2 is arranged behind the prefabricated module 1;
the connecting ribs 2 comprise a plurality of cross rods 201 which are equidistantly and transversely arranged and a plurality of vertical rods 202 which are equidistantly and vertically arranged along the cross rods 201, two ends of each of the cross rods 201 and the vertical rods 202 are bent into arc shapes, a plurality of drain holes 101 are formed in the prefabricated module 1, and a plurality of through holes 102 are formed in two sides of the prefabricated module;
a water discharging part 3, wherein the water discharging part 3 comprises a power part 4, a connecting pipe 5 and a water collecting pipe 6; the plurality of water collecting pipes 6 are connected with the power part 4 through connecting pipes 5, the plurality of water collecting pipes 6 are obliquely arranged along the length direction of the slope support and form a fixed angle with the horizontal plane, and the lengths of two adjacent water collecting pipes 6 are different; the iron wires are connected and fixed with the cross rods 201 through the through holes 102, the vertical rods 202 are connected with a slope supporting structure formed by concrete spraying, meanwhile, the two ends of the cross rods 201 and the two ends of the vertical rods 202 are in curved arc shapes, connection is convenient, and water seepage conditions can be observed through the water drainage holes 101;
inclined water collecting pipes 6 are arranged at intervals along the length direction of a slope surface support according to the condition of a stagnant water layer, and meanwhile, the lengths of two adjacent water collecting pipes 6 are different, wherein the included angle between the longer water collecting pipe 6 and the horizontal plane is smaller, and the included angle between the shorter water collecting pipe 6 and the horizontal plane is larger, so that the stagnant water layer is divided into a plurality of areas for precipitation by means of length combination, all the water collecting pipes 6 are started as required to meet the problem of rapid precipitation in the early stage, or part of the water collecting pipes 6 are started to perform periodic precipitation in the later stage, and the precipitation cost is saved; wherein, a valve is additionally arranged between the connecting pipe 5 and the water collecting pipe 6 to realize the control of opening and closing.
Referring to fig. 2, the power part 4 includes a vacuum pump 401, a water collecting sedimentation tank 402 and an external drainage manifold 403 which are connected in sequence, wherein the vacuum pump 401 is connected with the connecting pipe 5; the vacuum pump 401 is used for pumping the water collecting pipe 6 through the connecting pipe 5, negative pressure pumping precipitation is achieved, water flows into the water collecting sedimentation tank 402 after passing through, and during water flow containing soil and sundries, the water is automatically precipitated by gravity and then is discharged by the external drainage main pipe 403.
As shown in connection with fig. 4, the header 6 includes a main pipe 601 and a strainer pipe 602; the main pipe 601 is connected with the filter pipe 602; a plurality of quincunx inlet holes 603 are formed on the filter pipe 602; the filter pipe 602 is partially inserted into the upper water retaining layer, the quincunx inlet 603 is formed in the surface of the filter pipe 602, so that accumulated water can be conveniently extracted, meanwhile, the quincunx structure increases the water inflow, and the formed edge structure increases the suction force during extraction and improves the working efficiency;
optionally, a spiral plastic pipe 604, a fine filter screen 605, a support frame 606, a coarse filter screen 607 and an external protective net 608 are sequentially sleeved on the filter pipe 602 from inside to outside; the external protective net 608 can reduce the extrusion of coarse sand filter materials to the filter pipe, ensure smooth water flow, the coarse filter 607 and the fine filter 605 complete the water flow filtering effect, meanwhile, a support frame 606 consisting of a plurality of cylinders and circular rings is additionally arranged between the coarse filter 607 and the fine filter 605, so that the separation of the coarse filter 607 and the fine filter is realized, a water flow area is formed between the coarse filter 607 and the fine filter, the filtering effect is effectively increased, the phenomenon that the part cannot be filtered or even blocked due to adhesion is avoided, the water flow area is formed, the water flow can conveniently pass through, and the water flow can flow along the spiral plastic pipe 604 through the spiral plastic pipe 604, so that the water inlet guiding effect is achieved, and the extraction efficiency is improved;
optionally, the plastic tube 604 is provided with a plurality of notches 609; arc-shaped notches 609 are uniformly arranged on the spiral line of the spiral plastic pipe 604, so that the contact area between the plastic pipe 604 body and the filter pipe 602 can be reduced, the shielding of the inlet hole 603 is further reduced, and the water inlet area is effectively increased.
As shown in fig. 2, the lengths of the two adjacent water collecting pipes 6 are 2.5 meters and 5 meters respectively, and the distance between the two water collecting pipes is 1 meter; rationally arrange collector pipe 6, improve the rationality of structure, avoid two adjacent collector pipes 6 to appear the regional overlapping of drawing water, reduce extraction efficiency.
As shown in fig. 1, two ends of vertical rod 202 exceed the height of prefabricated module 1, and the length of the exceeding part is 250 mm; both ends of the vertical rod 202 exceed the height of the prefabricated module by 250mm, and the exceeding part of the vertical rod is 50mm to be made into a bent hook shape, so that the vertical rod can be conveniently lapped with the upper reinforcing mesh and the lower reinforcing mesh.
As shown in fig. 5, the external protection net 608 is composed of double-layer rings, prismatic through holes are formed in the surfaces of the double-layer rings for water to flow through, a partition plate is arranged at the center of each through hole and sequentially arranged along the axis of the external protection net 608 to form a support, coarse sand filter materials are blocked, small holes are formed in the partition plate for communicating the areas on the two sides, so that water flow can pass through the small holes conveniently, and the smooth flow of the water flow can be effectively guaranteed while protection is achieved.
A construction method of a foundation pit upper layer stagnant water precipitation slope support device comprises the following steps:
the method comprises the following steps: finding out the geological condition of a foundation pit area, referring to geological data, arranging holes at large intervals, then performing local encrypted drilling to obtain corresponding parameters and reserving hydrological observation holes;
step two: determining well point hole sites according to the transverse span of the slope and corresponding parameters, and sequentially forming hole sites with different depths and horizontal included angles along the length direction of the slope from the top of an upper stagnant water layer to form a multi-point drainage area;
step three: sinking a water collecting pipe 6 with a corresponding length according to the depth of the corresponding hole position, backfilling coarse sand filter materials into the hole position, and sealing the hole position with clay at the depth of 0.2 m;
step four: connecting the connecting pipe 5 with the water collecting pipe 6, and extracting the precipitation through the power part 4 arranged on the top of the slope;
step five: after precipitation, the prefabricated modules 1 are sequentially laid in the reserved upper water-retaining layer area and are connected with a slope supporting structure which is formed in advance on the upper part through the vertical rods 202;
step six: and continuously downwards excavating the foundation pit through the construction machinery and spraying the concrete support at the lower part to be connected and molded with the lower part of the prefabricated module 1.
In the third step, before the water collecting pipe 6 is sunk, a plurality of triangular supports are bound along the water collecting pipe 6 in sections and slide into hole positions to support the water collecting pipe 6; because be the angle and arrange the collector pipe, for perpendicular stringing of tradition, in backfilling coarse sand filter material, arouse easily that local attached appears in filter tube and hole site, reduce the effect of drawing water, install triangle-shaped support additional through the segmentation, realize the support with the contact of hole site inner wall, make things convenient for the backfill of filter material, guarantee the effect of drawing water simultaneously.
A construction method of a foundation pit upper layer stagnant water precipitation slope support device comprises the following steps:
the method comprises the following steps: finding out the geological condition of a foundation pit area, referring to geological data, arranging holes at large intervals, then performing local encrypted drilling to obtain corresponding parameters and reserving hydrological observation holes;
step two: determining the distance between well points and hole sites to be 1 meter according to the transverse span of the slope and corresponding parameters, and sequentially forming hole sites with the depths of 2.5 meters and 5 meters along the length direction of the slope from the top of an upper stagnant water layer and different included angles with the horizontal plane to form a multi-point drainage area;
step three: sinking water collecting pipes 6 with corresponding lengths according to the depths of 2.5 meters and 5 meters of corresponding hole positions, backfilling coarse sand filter materials into the hole positions, and sealing the holes with clay at the depth of 0.5 meter;
step four: connecting the connecting pipe 5 with the water collecting pipe 6, and extracting the precipitation through the power part 4 arranged on the top of the slope;
step five: after precipitation, the prefabricated modules 1 are sequentially laid in the reserved upper water-retaining layer area and are connected with a slope supporting structure which is formed in advance on the upper part through the vertical rods 202;
step six: continuously excavating the foundation pit downwards through the construction machinery and spraying the concrete support at the lower part to be connected and molded with the lower part of the prefabricated module 1
The corresponding parameters comprise physical mechanical parameters and permeability parameters and are used for judging the actual situation of geology;
step three: and sinking a water collecting pipe 6 with a corresponding length according to the depth of the corresponding hole position, backfilling coarse sand filter materials into the hole position, and sealing the hole position with clay at the depth of 0.2-0.5 m to prevent air leakage.
Example 1
The engineering project is located in the northern area and occupies 105.9 mu of land, the total building area is 185000m2, the perimeter of a project foundation pit is 1110m, the area is 68000m2, the excavation depth of the foundation pit is 9.0m-9.8m, no building is arranged around the excavation of the foundation pit, the distance from the municipal road and pipelines is far, and the foundation pit adopts a composite soil nailing wall slope-placing supporting mode;
checking geological conditions, checking geological conditions and analyzing and displaying data, wherein plain soil filling, silty clay, fine sand, silty clay and fine sand are respectively arranged from top to bottom, the underground water level burial depth is about 18.0m is obtained by drilling and drilling holes, underground water is distributed in the fine sand layer, so that the slope surface water seepage condition occurs when a foundation pit is excavated to the bottom of the fine sand layer, the water seepage condition occurs on the excavated surface after the foundation pit is excavated to the upper water-retaining layer, the fine sand of the upper water-retaining layer is almost in a flow state, the slope surface can not be supported by the structure of 'sprayed concrete + reinforcing mesh' according to the traditional design foundation pit supporting scheme (the upper water-retaining condition is found out by supplementary construction survey, the water-retaining layer is determined to be the fifth silty clay layer, the water-retaining layer burial depth is 7.00-8.60m, the thickness is 0.30-0.90m, the thickness of the upper water is about 0.7m, the upper layer of stagnant water is distributed in the upper layer of fine sand, continuous rainfall still occurs during excavation, the water level of the upper layer of stagnant water is in an ascending trend, and the permeability coefficient of the upper layer of the fine sand is determined to be 1.5 multiplied by 10 < -3 > cm/s according to survey experience);
the traditionally adopted vacuum dewatering well point pipes are all used vertically, the depth is large, the construction is inconvenient, well point hole sites are determined according to the transverse span of the slope and corresponding parameters, the distance between the hole sites is 1 meter, the hole sites with the depth of 2.5 meters and 5 meters are sequentially arranged along the length direction of the top of an upper layer stagnant water layer along the slope, and the included angles of the horizontal plane are respectively 25 degrees and 17 degrees, so that a multi-point drainage area is formed;
sinking a water collecting pipe 6 with corresponding length according to the depth of 2.5 meters and 5 meters of the corresponding hole site, backfilling coarse sand filter materials into the hole site, and sealing the hole site with clay at the corresponding depth of 0.4 meter;
connecting a connecting pipe 5 with a water collecting pipe 6, extracting precipitation through a power part 4 placed on the top of the slope, manufacturing a prefabricated module while arranging a precipitation well point pipe, and excavating a water retaining layer on the upper layer of the foundation pit 2 days after vacuum precipitation, wherein the slope only partially seeps water and does not collapse;
after precipitation, the prefabricated modules 1 are sequentially laid in the reserved upper water-retaining layer area and connected with a slope supporting steel bar structure which is formed in advance on the upper part through the vertical rods 202, so that the construction is fast, and the splicing is simple;
continuously excavating the foundation pit downwards through a construction machine, and spraying a concrete support at the lower part to be connected and molded with the lower part of the prefabricated module 1 to complete the integral construction;
the project is smooth in whole process, settle precipitation well point pipe and carried out the preparation of prefabricated module simultaneously, vacuum precipitation is after 2 days, excavate foundation ditch upper strata stagnant water layer position, domatic only partial infiltration does not have the phenomenon of collapsing, settle prefabricated module 1 back, have a little water to ooze from reserving the wash port, when meetting continuous rainfall weather, reserve the wash port infiltration when more, open vacuum pump 401, it appears and brokenly can strut good domatic to prevent a large amount of upper strata stagnant water through the fine control of collector pipe 6, the whole progress of engineering has effectively obtained the promotion, avoided simultaneously strutting the condition because of the infiltration, and utilize the infiltration situation of multiple spot position drainage area according to the difference, the selective drainage, the drainage cost has been reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. The utility model provides a domatic supporting device of stagnant water precipitation in foundation ditch upper strata which characterized in that includes:
the prefabricated module (1), the prefabricated module (1) is rectangular and is provided with a connecting rib (2) at the back;
the connecting rib (2) comprises a plurality of cross rods (201) which are equidistantly and transversely arranged and a plurality of vertical rods (202) which are equidistantly and vertically arranged along the cross rods (201), two ends of each of the cross rods (201) and the vertical rods (202) are bent into arc shapes, a plurality of drain holes (101) are formed in the prefabricated module (1), and a plurality of through holes (102) are formed in two sides of the prefabricated module;
a water discharging part (3), wherein the water discharging part (3) comprises a power part (4), a connecting pipe (5) and a water collecting pipe (6); a plurality of collector pipe (6) are connected with power part (4) through connecting pipe (5), and are a plurality of collector pipe (6) are followed domatic length direction of strutting and are personally submitted fixed angle slope with the level and arrange, and the length of two adjacent collector pipe (6) is different.
2. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the power part (4) comprises a vacuum pump (401), a water collecting sedimentation tank (402) and an external drainage main pipe (403) which are sequentially connected, and the vacuum pump (401) is connected with the connecting pipe (5).
3. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the water collecting pipe (6) comprises a main pipe (601) and a filter pipe (602); the main pipeline (601) is connected with a filter pipe (602); the filter tube (602) is provided with a plurality of quincunx inlet holes (603).
4. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 3 characterized in that: the filter tube (602) is sleeved with a spiral plastic tube (604), a fine filter screen (605), a support frame (606), a coarse filter screen (607) and an external protective net (608) from inside to outside in sequence.
5. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 4, characterized in that: the plastic pipe (604) is provided with a plurality of notches (609).
6. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the lengths of the adjacent two water collecting pipes (6) are respectively 2.5 meters and 5 meters, and the distance between the two water collecting pipes is 1 meter.
7. The foundation pit upper layer stagnant water precipitation slope supporting device of claim 1 characterized in that: the two ends of the vertical rod (202) exceed the height part of the prefabricated module (1), and the length of the exceeding part is 250 mm.
8. The construction method of the foundation pit upper layer stagnant water precipitation slope support device according to claim 1, characterized in that: the method comprises the following steps:
the method comprises the following steps: finding out the geological condition of a foundation pit area, referring to geological data, arranging holes at large intervals, then performing local encrypted drilling to obtain corresponding parameters and reserving hydrological observation holes;
step two: determining well point hole sites according to the transverse span of the slope and corresponding parameters, and sequentially forming hole sites with different depths and horizontal included angles along the length direction of the slope from the top of an upper stagnant water layer to form a multi-point drainage area;
step three: sinking a water collecting pipe (6) with a corresponding length according to the depth of the corresponding hole position, backfilling coarse sand filter materials into the hole position, and sealing the hole position with clay at the depth of 0.2-0.5 m;
step four: the connecting pipe (5) is communicated with the water collecting pipe (6), and the power part (4) placed on the top of the slope is used for extracting precipitation;
step five: after precipitation, the prefabricated modules (1) are sequentially laid in the reserved upper water layer stagnation area and are connected with a slope supporting structure which is formed in advance on the upper portion through vertical rods (202);
step six: and continuously downwards excavating the foundation pit through the construction machinery, and spraying the concrete support at the lower part to be connected and molded with the lower part of the prefabricated module (1).
9. The construction method of the foundation pit upper layer stagnant water precipitation slope support device according to claim 8, characterized in that: and in the third step, before the water collecting pipe (6) is sunk, a plurality of triangular supports are bound along the water collecting pipe (6) in a segmented manner and slide into hole positions to support the water collecting pipe (6).
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