CN113605427A - Precipitation construction method for foundation pit with superfine sandy soil near lake - Google Patents
Precipitation construction method for foundation pit with superfine sandy soil near lake Download PDFInfo
- Publication number
- CN113605427A CN113605427A CN202110867269.XA CN202110867269A CN113605427A CN 113605427 A CN113605427 A CN 113605427A CN 202110867269 A CN202110867269 A CN 202110867269A CN 113605427 A CN113605427 A CN 113605427A
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- Prior art keywords
- sand
- foundation pit
- free concrete
- pipe
- sandy soil
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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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- 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/20—Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
Abstract
The invention discloses a precipitation construction method for a foundation pit with superfine sandy soil near a lake, and belongs to the field of foundation pit precipitation. The method comprises the following steps: the method comprises the following steps: drilling holes outside the side slope of the superfine sandy soil foundation pit of the basement foundation pit by calculation, wherein the diameter is the depth which is determined by calculation and is obtained by adding 600 mm to the diameter of the sand-free concrete permeable pipe; step two: wrapping a single-layer corrosion-resistant dense-mesh filter cloth outside the sand-free concrete permeable pipe; step three: sequentially installing sand-free concrete permeable pipes wrapped with single-layer corrosion-resistant dense-mesh filter cloth, and wrapping double-layer corrosion-resistant dense-mesh filter cloth between two sections of the sand-free concrete permeable pipes; step four: after the installation is finished, filling filter materials around the sand-free concrete permeable pipe wrapped with the single-layer corrosion-resistant dense-mesh filter cloth; step five: and a water pump is arranged in the sand-free concrete permeable pipe and is connected with a drain pipe. The loss of the superfine sandy soil in the precipitation process can be eliminated at one time, the precipitation effect is guaranteed, the superfine sandy soil of the foundation pit side slope can be dried for a long time, and the stability of the foundation pit side slope is further guaranteed.
Description
Technical Field
The invention relates to the technical field, in particular to a precipitation construction method for a foundation pit with superfine sandy soil near a lake.
Background
At present, with the rapid development of economy in China, the requirements of people on residential environment and community quality are higher and higher, in order to meet the requirements of people, related enterprises can change the surrounding environment of a patterned improved community, so that various lake-facing residential communities are formed, the scale of the community is larger and larger, high-rise buildings are increased, and in order to meet the requirements of use functions, one-layer or multi-layer basements (civil defense projects or basements) are generally arranged. In the whole process of basement foundation pit construction, the safety of the foundation pit side slope is particularly important. The primary safety condition of the foundation pit side slope is the precipitation effect of the foundation pit, and the underground water level must be reduced to 1m below the bottom of the basement foundation pit.
In the practice of basement foundation pit dewatering, a pipe well dewatering scheme is generally adopted. The conventional method comprises the following steps: and (3) drilling dewatering wells 1m outside the side slope at the periphery of the foundation pit according to a certain distance through calculation, installing sand-free concrete permeable pipes, installing a water pump in the dewatering wells, and continuously draining water until the underground water level is lowered to a required horizontal plane. The scheme can not ensure that the precipitation well in the superfine sandy soil does not have the phenomena of displacement, hole collapse and the like.
Disclosure of Invention
The invention aims at solving the defects and the defects of the existing conventional basement foundation pit dewatering scheme that the special soil and special environment-the lake-facing superfine sandy soil foundation pit dewatering well cannot be ensured, and adopts a lake-facing superfine sandy soil foundation pit dewatering construction method to prevent the precipitation well pipe from shifting and collapsing due to the loss of superfine sandy soil in the dewatering process, further prevent the basement foundation pit side slope from being unstable, ensure the safety of construction workers in the foundation pit, furthest reduce the personal and property losses caused by safety production accidents, and promote the reputation of construction enterprises.
In order to achieve the purpose, the invention adopts the following technical scheme:
a precipitation construction method for a foundation pit with superfine sandy soil adjacent to a lake comprises the following steps:
the method comprises the following steps: drilling holes outside the side slope of the superfine sandy soil foundation pit of the basement foundation pit by calculation, wherein the diameter is the depth which is determined by calculation and is obtained by adding 600 mm to the diameter of the sand-free concrete permeable pipe;
step two: wrapping a single-layer corrosion-resistant dense-mesh filter cloth outside the sand-free concrete permeable pipe;
step three: sequentially installing sand-free concrete permeable pipes wrapped with single-layer corrosion-resistant dense-mesh filter cloth, and wrapping double-layer corrosion-resistant dense-mesh filter cloth between two sections of the sand-free concrete permeable pipes;
step four: after the installation is finished, filling filter materials around the sand-free concrete permeable pipe wrapped with the single-layer corrosion-resistant dense-mesh filter cloth;
step five: and a water pump is arranged in the sand-free concrete permeable pipe and is connected with a drain pipe.
Preferably, install locating component including the bottom of no sand concrete pipe of permeating water, this locating component includes that at least three equidistant circumference of group distribute and with no sand concrete pipe wall rotation installation's locating pawl to and install the piece that resets between pipe wall and locating pawl.
Preferably, after the fifth step is completed, drilling auxiliary water reducing holes at the bottom of the foundation pit, wherein the auxiliary water reducing holes are circumferentially distributed on the outer side of the sand-free concrete water permeable pipe, a water supply pipe with the same structure as the sand-free concrete water permeable pipe is installed in the auxiliary water reducing holes, and the outer side of the auxiliary water reducing holes is wrapped by corrosion-resistant dense-mesh filter cloth and filter materials.
Preferably, the depth of the auxiliary water dropping hole is 4/5-5/6 of the length of the soft water pipe made of the sand-free concrete.
Compared with the prior art, the invention has the following beneficial effects:
the method can eliminate the loss of the superfine sandy soil in the dewatering process at one time, ensure the dewatering effect, and can dry the superfine sandy soil of the foundation pit side slope for a long time, thereby ensuring the stability of the foundation pit side slope and the safety of building constructors in the foundation pit, thereby realizing the safe and accident-free target of the whole building system engineering, achieving the safe construction purpose of the deep foundation pit engineering of the lake surrounding building and obtaining good safe production atmosphere and social credit.
Drawings
FIG. 1 is a schematic construction view of example 1 of the present invention;
FIG. 2 is a schematic view of the bottom structure of a permeable pipe according to example 1 of the present invention;
FIG. 3 is a schematic construction view of example 2 of the present invention;
fig. 4 is a plan view of construction according to example 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1: as shown in figure 1, the construction method for dewatering of the superfine sandy soil foundation pit of the adjacent lake comprises the following steps:
the method comprises the following steps: drilling holes outside the side slope of the superfine sandy soil foundation pit of the basement foundation pit by calculation, wherein the diameter is the depth which is determined by calculation and is obtained by adding 600 mm to the diameter of the sand-free concrete permeable pipe;
step two: wrapping a single-layer corrosion-resistant dense-mesh filter cloth outside the sand-free concrete permeable pipe;
step three: sequentially installing sand-free concrete permeable pipes wrapped with single-layer corrosion-resistant dense-mesh filter cloth, and wrapping double-layer corrosion-resistant dense-mesh filter cloth between two sections of the sand-free concrete permeable pipes;
step four: after the installation is finished, filling filter materials around the sand-free concrete permeable pipe wrapped with the single-layer corrosion-resistant dense-mesh filter cloth;
step five: and a water pump is arranged in the sand-free concrete permeable pipe and is connected with a drain pipe.
Wherein, locating component is installed to the bottom of this no sand concrete pipe of permeating water, and this locating component includes 4 equidistant circumference distributions and rotates the locating pawl of installation with no sand concrete pipe wall of permeating water to and install the piece (spring) that resets between pipe wall and locating pawl. The pipe will permeate water through the use of this locating component and fix a position effectively, prevents that the filter material from filling inhomogeneously, leads to sand to run off, also can guarantee the precipitation quality.
Due to the combined action of underground water and lake water, the water volume of the foundation pit slope facing the superfine sandy soil of the lake is large. The anti-corrosion dense-mesh filter cloth is wrapped on the sand-free concrete permeable pipe, and the filter material (fine stones) with the thickness of 300 mm is poured around the sand-free concrete permeable pipe, so that the problem that the precipitation well pipe is displaced and collapsed due to the loss of superfine sandy soil during long-time precipitation can be thoroughly solved, the instability phenomenon of the basement foundation pit side slope is caused, the personal safety of building constructors in the foundation pit is ensured, the engineering safety accident-free goal of the whole building system is realized, and the safety of the building constructors in the foundation pit is ensured.
Example 2: on the basis of example 1: as shown in fig. 3 and 4, the method for dewatering construction of the superfine sandy soil foundation pit adjacent to the lake comprises the following steps:
the method comprises the following steps: drilling holes outside the side slope of the superfine sandy soil foundation pit of the basement foundation pit by calculation, wherein the diameter is the depth which is determined by calculation and is obtained by adding 600 mm to the diameter of the sand-free concrete permeable pipe;
step two: wrapping a single-layer corrosion-resistant dense-mesh filter cloth outside the sand-free concrete permeable pipe;
step three: sequentially installing sand-free concrete permeable pipes wrapped with single-layer corrosion-resistant dense-mesh filter cloth, and wrapping double-layer corrosion-resistant dense-mesh filter cloth between two sections of the sand-free concrete permeable pipes;
step four: after the installation is finished, filling filter materials around the sand-free concrete permeable pipe wrapped with the single-layer corrosion-resistant dense-mesh filter cloth;
step five: installing a water pump in the sand-free concrete permeable pipe, and connecting the water pump with a drain pipe;
step six: the bottom of the foundation pit is drilled with auxiliary water reducing holes, the auxiliary water reducing holes are circumferentially distributed on the outer side of the sand-free concrete water permeable pipe, a water supply pipe with the same structure as the sand-free concrete water permeable pipe is installed in the auxiliary water reducing holes, the outer side of the auxiliary water reducing holes is wrapped with anti-corrosion dense filter cloth and filter materials, and the depth of the auxiliary water reducing holes is 4/5-5/6 of the length of the sand-free concrete water flexible pipe. A new circle of auxiliary water reducing holes are drilled on the outer side, when water is reduced through the auxiliary water reducing holes on the outer side, water in the inner portion of the water reducing holes in the middle can be greatly reduced, the water level of the water reducing holes in the middle can be reduced faster, and sand and stone loss at the bottom of a foundation pit can be avoided.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. The technical solution and the inventive concept thereof according to the present invention should be equally replaced or changed within the protection scope of the present invention.
Claims (4)
1. A precipitation construction method for a foundation pit with superfine sandy soil adjacent to a lake is characterized by comprising the following steps:
the method comprises the following steps: drilling holes outside the side slope of the superfine sandy soil foundation pit of the basement foundation pit by calculation, wherein the diameter is the depth which is determined by calculation and is obtained by adding 600 mm to the diameter of the sand-free concrete permeable pipe;
step two: wrapping a single-layer corrosion-resistant dense-mesh filter cloth outside the sand-free concrete permeable pipe;
step three: sequentially installing sand-free concrete permeable pipes wrapped with single-layer corrosion-resistant dense-mesh filter cloth, and wrapping double-layer corrosion-resistant dense-mesh filter cloth between two sections of the sand-free concrete permeable pipes;
step four: after the installation is finished, filling filter materials around the sand-free concrete permeable pipe wrapped with the single-layer corrosion-resistant dense-mesh filter cloth;
step five: and a water pump is arranged in the sand-free concrete permeable pipe and is connected with a drain pipe.
2. The method as claimed in claim 1, wherein the positioning assembly is mounted at the bottom of the pervious pipe, and comprises at least three sets of positioning claws circumferentially distributed at equal intervals and rotatably mounted on the wall of the pervious pipe, and a resetting member mounted between the wall and the positioning claws.
3. The method for constructing the foundation pit through dewatering of the extra fine sandy soil in the lake according to claim 2, wherein after the fifth step, the bottom of the foundation pit is drilled with auxiliary dewatering holes which are circumferentially distributed on the outer side of the sand-free concrete water permeable pipe, a water supply pipe having the same structure as the sand-free concrete water permeable pipe is installed in the auxiliary dewatering holes, and the outer side of the auxiliary dewatering holes is wrapped with the corrosion-resistant dense mesh filter cloth and the filter material.
4. The method for constructing the foundation pit dewatering of the extra fine sandy soil in the lake as claimed in claim 3, wherein the depth of the auxiliary dewatering holes is 4/5-5/6 of the length of the soft water pipe of the sand-free concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110867269.XA CN113605427A (en) | 2021-07-30 | 2021-07-30 | Precipitation construction method for foundation pit with superfine sandy soil near lake |
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| CN202110867269.XA CN113605427A (en) | 2021-07-30 | 2021-07-30 | Precipitation construction method for foundation pit with superfine sandy soil near lake |
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| CN202110867269.XA Pending CN113605427A (en) | 2021-07-30 | 2021-07-30 | Precipitation construction method for foundation pit with superfine sandy soil near lake |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809049A (en) * | 2022-04-22 | 2022-07-29 | 中国十七冶集团有限公司 | Method for preventing sand and soil loss around dewatering well in water-rich sand and soil area |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205152968U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | Precipitation tubular well structure |
| CN205152969U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | A precipitation tubular well structure for foundation ditch precipitation |
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2021
- 2021-07-30 CN CN202110867269.XA patent/CN113605427A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205152968U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | Precipitation tubular well structure |
| CN205152969U (en) * | 2015-11-19 | 2016-04-13 | 中国建筑第七工程局有限公司 | A precipitation tubular well structure for foundation ditch precipitation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809049A (en) * | 2022-04-22 | 2022-07-29 | 中国十七冶集团有限公司 | Method for preventing sand and soil loss around dewatering well in water-rich sand and soil area |
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Application publication date: 20211105 |