CN110761308A - Local foundation pit construction method - Google Patents

Local foundation pit construction method Download PDF

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Publication number
CN110761308A
CN110761308A CN201911039624.3A CN201911039624A CN110761308A CN 110761308 A CN110761308 A CN 110761308A CN 201911039624 A CN201911039624 A CN 201911039624A CN 110761308 A CN110761308 A CN 110761308A
Authority
CN
China
Prior art keywords
foundation pit
water
local
local foundation
construction method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911039624.3A
Other languages
Chinese (zh)
Inventor
郭晓伟
龙天宝
何龙飞
赵瑞峰
张培山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING HONGJIAN ENGINEERING Co Ltd
Original Assignee
BEIJING HONGJIAN ENGINEERING Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BEIJING HONGJIAN ENGINEERING Co Ltd filed Critical BEIJING HONGJIAN ENGINEERING Co Ltd
Priority to CN201911039624.3A priority Critical patent/CN110761308A/en
Publication of CN110761308A publication Critical patent/CN110761308A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02Sheet piles or sheet pile bulkheads
    • E02D5/03Prefabricated parts, e.g. composite sheet piles
    • E02D5/04Prefabricated parts, e.g. composite sheet piles made of steel

Abstract

The invention belongs to the technical field of building drainage construction, and discloses a local foundation pit construction method, which comprises the following steps: s1, excavating a local foundation pit to the underground water level; step S2, inserting water stop steel plates around the pit; step S3, a drain pipe is lowered in the pit for draining; s4, continuously excavating the local foundation pit to the designed substrate elevation, and reserving the sand and soil amount and water amount required by piling; and step S5, pouring the filler into the local foundation pit, and stirring by using the stirring pile to form a soft foundation. According to the invention, the water stop steel plate is inserted, so that the water quantity and the speed of groundwater flowing into the local foundation pit can be reduced, and the drainage pipe only reduces the water of the local foundation pit when draining water, so that the water reduction construction period is shortened, and the situation of surface settlement around the ground can be avoided. Meanwhile, the construction method reserves the amount of sandy soil and water required by piling in the process of continuously excavating the local foundation pit, effectively utilizes resources and reduces the investment of raw materials.

Description

Local foundation pit construction method
Technical Field
The invention relates to the technical field of building drainage construction, in particular to a local foundation pit construction method.
Background
In the building construction, according to the actual situation on site, a local foundation pit needs to be continuously excavated in the excavated large foundation pit as a tower crane foundation. When a local foundation pit is excavated, the situation that underground water is more is often met, and precipitation operation is needed. At present, a common precipitation method is to bury a water pumping pipe in a local foundation pit and pump water by using a water pumping pump. The precipitation method is low in precipitation speed, water in a certain range around the local foundation pit can be completely pumped away by the precipitation method, surrounding ground surface settlement is easily caused, and serious potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a local foundation pit construction method which can shorten the dewatering construction period and avoid the occurrence of the surrounding ground surface settlement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a local foundation pit construction method comprises the following steps:
s1, excavating a local foundation pit to the underground water level;
step S2, inserting water stop steel plates around the pit;
step S3, a drain pipe is lowered in the pit for draining;
s4, continuously excavating the local foundation pit to a designed base elevation, and reserving the sand and soil amount and water amount required by piling;
and step S5, pouring the filler into the local foundation pit, and stirring by using the stirring pile to form a soft foundation.
Preferably, in the process of continuously excavating the local foundation pit to the designed base elevation in step S4, the water-stop steel plate is always inserted into the local foundation pit, and the height of the water-stop steel plate is greater than the height from the base elevation to the groundwater level.
Preferably, the water stop steel plate is provided with a pressure relief hole, and the pressure relief hole is positioned below the underground water level.
Preferably, the diameter of the pressure reduction hole is 8-12 cm.
Preferably, the pressure reducing holes are provided in plurality, and the plurality of pressure reducing holes are provided in two rows in a direction parallel to the bottom of the foundation pit.
Preferably, the distance between two adjacent pressure-reducing holes in each row of pressure-reducing holes is 1 to 1.25 m.
Preferably, the specific steps of step S1 are:
s11, cleaning the periphery of the local foundation pit, and leveling the ground to a designed elevation;
step S12, paying off and measuring to determine the excavation width;
and S13, excavating by adopting an excavator until the soil reaches the underground water level.
Preferably, the method for constructing a local foundation pit further includes a step S6, and the step S6 is to pull out the water stop steel plate.
Preferably, the drain pipe in the step S3 may discharge groundwater to a storage well at a construction site.
Preferably, the filler is cement.
The invention has the beneficial effects that:
according to the local foundation pit construction method, the water quantity and the speed of the underground water flowing into the local foundation pit can be reduced by inserting the water stop steel plate, and the drainage pipe only reduces the water of the local foundation pit when water is drained and reduced, so that the water reduction construction period is shortened, the ground surface settlement condition around the local foundation pit can be avoided, and the stability of the soil below the foundation pit is improved. Meanwhile, the amount of sandy soil and water required by piling is reserved in the process of continuously excavating the local foundation pit by the local foundation pit construction method, resources are effectively utilized, and the investment of raw materials is reduced.
Drawings
FIG. 1 is a flow chart of a method for constructing a local foundation pit according to an embodiment of the present invention;
FIG. 2 is a front view of a partial pit according to an embodiment of the present invention;
fig. 3 is a top view of a partial foundation pit according to an embodiment of the present invention.
In the figure:
1. local foundation pits; 2. a water stop steel plate; 3. a drain pipe; 31. a header pipe; 32. a branch pipe; 4. and (5) stirring the piles.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1 to 3, the present invention provides a local foundation pit construction method, including the steps of: s1, excavating a local foundation pit 1 to an underground water level; step S2, inserting water stop steel plates 2 into the periphery of the pit; step S3, lowering a drain pipe 3 in the pit for draining; s4, continuously excavating the local foundation pit 1 to a designed substrate elevation, and reserving the sand and soil amount and water amount required by piling; and step S5, pouring the filler into the local foundation pit 1, and stirring by using the stirring pile 4 to form a soft foundation.
This local foundation ditch construction method can reduce groundwater and gush into the water yield and the speed of local foundation ditch 1 through inserting stagnant water steel sheet 2, and drain pipe 3 only carries out precipitation to local foundation ditch 1 when drainage precipitation moreover, has not only shortened the precipitation time limit for a project, can also avoid the emergence of the earth's surface condition of subsiding on every side, has improved the stability of basic lower part soil. Meanwhile, the local foundation pit construction method reserves the sand and soil amount and water amount required by piling in the process of continuously excavating the local foundation pit 1, effectively utilizes resources and reduces the investment of raw materials.
The specific steps of step S1 are: s11, cleaning the periphery of the local foundation pit 1, and leveling the ground to a designed elevation; step S12, paying off and measuring to determine the excavation width; and step S13, excavating by adopting an excavator to reach the underground water level.
Alternatively, the drain pipe 3 in step S3 can discharge the groundwater to the storage well at the construction site. Water is provided for subsequent construction, and water resources are saved. In this embodiment, drain pipe 3 selects the PVC pipe for the environmental protection, and drain pipe 3 includes house steward 31 and a plurality of bleeder 32, and bleeder 32 inserts and extracts groundwater in the silt layer of local foundation ditch 1, and the groundwater of extracting flows in house steward 31 and discharges to the retaining well in. In the step S4, in the process of continuously excavating the local foundation pit 1 to the designed height of the foundation, the drain pipe 3 needs to be pressed down according to the actual situation on site, so that the drainage is smoother. When the underground water in the local foundation pit 1 is discharged to the reserved amount to meet the requirement of piling, the drainage is stopped, and the drain pipe 3 can be directly buried underground for convenient construction operation without recovery treatment.
In the process of continuously excavating the local foundation pit 1 to design the elevation of the base in the step S4, the water stop steel plate 2 is always inserted into the local foundation pit 1, and the height of the water stop steel plate 2 is greater than the height from the elevation of the base to the underground water level.
In order to reduce the pressure of the underground water to the water stopping steel plate 2, optionally, the water stopping steel plate 2 is provided with a pressure reducing hole, and the pressure reducing hole is positioned below the underground water level in the height direction of the water stopping steel plate 2. Considering that the pressure of the underground water belt to the water stop steel plate 2 is large, the plurality of pressure reducing holes are arranged, two rows of the plurality of pressure reducing holes are arranged in the direction parallel to the bottom of the foundation pit, and the number of the pressure reducing holes in each row is the same. Considering that the pressure reducing holes can not only reduce the pressure but also enable a large amount of underground water to enter the local foundation pit 1, the diameter of each pressure reducing hole is set to be 8-12cm, and the distance between two adjacent pressure reducing holes in each row of pressure reducing holes is set to be 1-1.25 m. Preferably, the diameter of the pressure-reducing holes is set to 10cm, and the distance between two adjacent pressure-reducing holes in each row is set to 1 m. In this embodiment, the size of the local foundation pit 1 is 10 × 10m, the length of the water stop steel plate 2 is 10m, and 10 pressure relief holes are provided in each row.
The local foundation pit construction method further comprises a step S6, wherein the step S6 is to pull out the water stop steel plate 2. And after the soft foundation is formed, pulling out the water stop steel plates 2 around the local foundation pit 1, and constructing on the soft foundation. In this example, the filler is selected to be cement. In other embodiments, the filler may be selected to be loess, gravel, etc., depending on the geological conditions of the excavation.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A local foundation pit construction method is characterized by comprising the following steps:
s1, excavating a local foundation pit (1) to an underground water level;
step S2, inserting water stop steel plates (2) around the pit;
step S3, a drain pipe (3) is placed in the pit for draining;
s4, continuously excavating the local foundation pit (1) to a designed base elevation, and reserving the sand and soil amount and water amount required by piling;
and step S5, pouring the filler into the local foundation pit, and stirring by using the stirring pile (4) to form a soft foundation.
2. The method for constructing a local foundation pit according to claim 1, wherein in the step S4, in the process of continuing excavating the local foundation pit (1) to the designed base elevation, the water-stop steel plate (2) is always inserted into the local foundation pit (1), and the height of the water-stop steel plate (2) is greater than the height from the base elevation to the groundwater level.
3. The local foundation pit construction method according to claim 1, wherein the water stop steel plate (2) is provided with a pressure relief hole, and the pressure relief hole is positioned below the underground water level.
4. The method of claim 3, wherein the pressure relief vent has a diameter of 8-12 cm.
5. The partial foundation pit construction method according to claim 3, wherein the plurality of pressure relief holes are provided in two rows in a direction parallel to the bottom of the foundation pit.
6. The method for constructing a partial foundation pit according to claim 5, wherein the distance between two adjacent pressure relief holes in each row of pressure relief holes is 1-1.25 m.
7. The local foundation pit construction method according to claim 1, wherein the specific steps of the step S1 are as follows:
s11, cleaning the periphery of the local foundation pit (1) and leveling the ground to a designed elevation;
step S12, paying off and measuring to determine the excavation width;
and S13, excavating by adopting an excavator until the soil reaches the underground water level.
8. The partial foundation pit construction method according to claim 1, further comprising a step S6, wherein the step S6 is to pull out the water stop steel plate (2).
9. The partial foundation pit construction method according to claim 1, wherein the drain pipe (3) in the step S3 is capable of discharging groundwater to a water storage well of a construction site.
10. The method of claim 1, wherein the filler is cement.
CN201911039624.3A 2019-10-29 2019-10-29 Local foundation pit construction method Pending CN110761308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911039624.3A CN110761308A (en) 2019-10-29 2019-10-29 Local foundation pit construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911039624.3A CN110761308A (en) 2019-10-29 2019-10-29 Local foundation pit construction method

Publications (1)

Publication Number Publication Date
CN110761308A true CN110761308A (en) 2020-02-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111778995A (en) * 2020-07-22 2020-10-16 陕西国杨建设工程有限公司 Foundation pit protection structure and construction method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0220720A (en) * 1988-07-07 1990-01-24 Taisei Corp Underground construction method by muddy water excavation
CN105544576A (en) * 2016-01-20 2016-05-04 山东科技大学 Foundation ditch dewatering and drainage excavation structure and application method
CN105804067A (en) * 2016-03-25 2016-07-27 上海十三冶建设有限公司 Construction method for structural steel cemented soil stirring pile stand column used for deep foundation pit support
CN205591208U (en) * 2016-03-08 2016-09-21 马鞍山瑞马钢板桩科技有限公司 Take linear type steel sheet pile of guard plate
CN208088281U (en) * 2018-03-13 2018-11-13 中铁第四勘察设计院集团有限公司 One kind being used for deep sandy soil deep pit digging structure
CN110029680A (en) * 2019-04-19 2019-07-19 五矿二十三冶建设集团有限公司 A kind of deep foundation pit precipitation construction method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0220720A (en) * 1988-07-07 1990-01-24 Taisei Corp Underground construction method by muddy water excavation
CN105544576A (en) * 2016-01-20 2016-05-04 山东科技大学 Foundation ditch dewatering and drainage excavation structure and application method
CN205591208U (en) * 2016-03-08 2016-09-21 马鞍山瑞马钢板桩科技有限公司 Take linear type steel sheet pile of guard plate
CN105804067A (en) * 2016-03-25 2016-07-27 上海十三冶建设有限公司 Construction method for structural steel cemented soil stirring pile stand column used for deep foundation pit support
CN208088281U (en) * 2018-03-13 2018-11-13 中铁第四勘察设计院集团有限公司 One kind being used for deep sandy soil deep pit digging structure
CN110029680A (en) * 2019-04-19 2019-07-19 五矿二十三冶建设集团有限公司 A kind of deep foundation pit precipitation construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111778995A (en) * 2020-07-22 2020-10-16 陕西国杨建设工程有限公司 Foundation pit protection structure and construction method thereof
CN111778995B (en) * 2020-07-22 2021-11-12 陕西国杨建设工程有限公司 Foundation pit protection structure and construction method thereof

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Application publication date: 20200207