CN108343067B - Method for excavating foundation pit on soft soil with water content of more than 60 percent - Google Patents
Method for excavating foundation pit on soft soil with water content of more than 60 percent Download PDFInfo
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- CN108343067B CN108343067B CN201810143220.8A CN201810143220A CN108343067B CN 108343067 B CN108343067 B CN 108343067B CN 201810143220 A CN201810143220 A CN 201810143220A CN 108343067 B CN108343067 B CN 108343067B
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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
Abstract
The invention discloses a method for excavating a foundation pit on soft soil with water content of more than 60%, which comprises the following steps: dividing a foundation pit area to be excavated into three strip areas to be excavated, wherein the three strip areas to be excavated are respectively provided with a first excavator, a second excavator and a third excavator; firstly, carrying out first-stage excavation, then carrying out second-stage excavation, and finally carrying out third-stage excavation to form three excavators, three steps and terrace type excavation; the construction method has the advantages that the construction method is adopted, except that the first and second stages have small influence on the work efficiency, the work efficiency is not influenced from the third stage, the construction period is slightly influenced, the economic benefit is obvious, and the method is particularly suitable for large-area soft soil excavation; is beneficial to popularization and application and has high social benefit.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment, in particular to a method for excavating a foundation pit on soft soil with the water content of more than 60 percent.
Background
The burial depth requirement of high-rise buildings; under the condition that the volume ratio is limited, the area of the garage is increased; and other requirements, almost every newly-built building has a basement; the excavation of the foundation pit of the basement belongs to a project with high risk, and a special construction scheme is generally formulated and demonstrated by experts. The basement foundation pit excavation is firstly related to safety, and secondly related to engineering quality, including engineering pile quality and basement construction quality; the excavation of the foundation pit in the soft soil area is subject to strict national and regional corresponding specifications and standards, including layering, stepping and terrace excavation.
When the water content of the soil is more than 60%, layering and stepping are performed, terrace type excavation is difficult to implement, and even if a roadbed box and a roadbed are placed, the excavator is difficult to stop on the roadbed. The excavation unit usually stops on the surface hard shell layer and excavates to the bottom, and finally large-area deviation and breakage of the engineering pile are formed, so that a large number of three-type piles and four-type piles are generated, major quality accidents and economic losses are caused, and the construction period is delayed. In some projects, a common cement stirring pile driving method is adopted, the bearing capacity of the foundation is improved, conditions are created, the excavator is allowed to stop, layering, step dividing and terrace type construction are achieved, and the cost is high.
Disclosure of Invention
The invention aims to provide a method for excavating a foundation pit on soft soil with water content of more than 60 percent so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for excavating a foundation pit on soft soil with water content of more than 60% comprises the following steps:
1) dividing a foundation pit area to be excavated into three strip areas to be excavated, wherein the three strip areas to be excavated are respectively planned to be provided with a first excavator, a second excavator and a third excavator;
2) carrying out first-stage excavation, namely excavating a first excavator into the outermost side strip area to be excavated, stopping on the hard shell layer at the starting end of the outermost side strip area to be excavated, and then gradually retreating and excavating along the extension direction of the outermost side strip area to be excavated;
3) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form a new hard shell layer;
4) performing second-stage excavation, namely re-excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated on the outermost side, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated on the outermost side; meanwhile, the second excavator is driven to the hard shell layer at the starting end of the middle strip area to be excavated and gradually retreats and excavates along the extending direction of the middle strip area to be excavated;
5) exposing original soil in foundation soil after excavating the strip area to be excavated at the outermost side and the strip area to be excavated in the middle, and gradually drying the exposed original soil in the foundation soil by the sun, wind and air to form two new hard shell layers;
6) excavating at the third stage, namely excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated at the outermost side again, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated at the outermost side; meanwhile, the second excavator is re-excavated to a new hard shell layer at the starting end of the middle strip area to be excavated, and the second excavator gradually retreats and excavates on the new hard shell layer along the extending direction of the middle strip area to be excavated; simultaneously, the third excavator is driven to the hard shell layer at the starting end of the innermost strip area to be excavated and gradually retreats and excavates along the extending direction of the innermost strip area to be excavated to form three excavators, three steps and terrace type excavation;
7) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, the strip area to be excavated in the middle and the strip area to be excavated on the innermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form three new hard shell layers;
8) and sequentially and repeatedly digging according to the step 6) and the step 7) until a foundation pit meeting the construction requirement is formed.
As a further scheme of the invention: in the process of excavation of the foundation pit, the exposed original soil in the foundation soil is prohibited from being disturbed after excavation.
As a further scheme of the invention: and 3) air-drying the soft soil for 24-48 h.
As a further scheme of the invention: and 5) air-drying the soft soil for 24-48 h.
As a further scheme of the invention: and in the step 7), the air drying time of the soft soil is 24-48 h.
As a further scheme of the invention: and arranging drainage systems around the region of the foundation pit to be excavated, and intermittently draining accumulated water on the soft soil out of the foundation pit.
Compared with the prior art, the invention has the beneficial effects that: the original soil is disturbed less, sunlight and wind are fully utilized to harden the soil, construction is arranged in order, the previous soil excavation procedure creates a working surface and working conditions for the next soil excavation procedure, so that the purposes of layering, step dividing and terrace type construction are achieved, and the problem that layering, step dividing and terrace type excavation are difficult to implement on soft soil with the soil water content of more than 60 percent is solved; by adopting the construction method, except that the first and second stages have small influence on the working efficiency, the working efficiency is not influenced from the third stage, the construction period is less influenced, the economic benefit is obvious, and the method is suitable for large-area soft soil excavation; is beneficial to popularization and application and has high social benefit.
Drawings
FIG. 1 is a schematic view of a first stage excavation plan in a method for performing excavation of a foundation pit on soft soil having a water content of greater than 60%;
FIG. 2 is a schematic illustration of a first stage excavation profile in a method of performing a foundation pit excavation on soft soil having a water content greater than 60%;
FIG. 3 is a schematic view of a second stage of excavation in a method for performing excavation of a foundation pit on soft soil having a water content of greater than 60%;
FIG. 4 is a schematic illustration of a second stage excavation profile in a method for performing excavation of a foundation pit on soft soil having a water content greater than 60%;
FIG. 5 is a schematic illustration of a third stage excavation plan for a method of excavating a foundation pit in soft soil having a water content greater than 60%;
fig. 6 is a schematic illustration of a third stage excavation profile in a method for performing a foundation pit excavation on soft soil having a water content greater than 60%.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a method for excavating a foundation pit on soft soil with water content of more than 60% comprises the following steps:
1) dividing a foundation pit area to be excavated into three strip areas to be excavated, wherein the three strip areas to be excavated are respectively planned to be provided with a first excavator, a second excavator and a third excavator;
2) carry out first stage excavation, open first platform excavator into the outside and treat and dig a district, stop on the crust layer of the outside and treat and dig a district initiating terminal, then, treat along the outside and wait to dig the extending direction in a district and progressively retreat and dig, in the foundation ditch excavation in-process and before forming the crust layer, the original soil that exposes in the foundation soil after forbidding to excavate suffers the disturbance, promptly: the excavator can not be dug down and people can not be dug down;
3) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form a new hard shell layer; the air drying time is determined by the water content of soil, the intensity of sunlight and the intensity of wind, and is generally 24 hours, and can be 36 hours or 48 hours;
4) performing second-stage excavation, namely re-excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated on the outermost side, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated on the outermost side; simultaneously, open the second platform excavator to the centre treat to dig the crust layer of strip district initiating terminal on, wait to dig the extending direction in strip district along the centre and progressively retreat and dig, in the foundation ditch excavation in-process and before forming the crust layer, the original soil that exposes in the foundation soil after forbidding to excavate suffers the disturbance, promptly: the excavator can not be dug down and people can not be dug down;
5) exposing original soil in foundation soil after excavating the strip area to be excavated at the outermost side and the strip area to be excavated in the middle, and gradually drying the exposed original soil in the foundation soil by the sun, wind and air to form two new hard shell layers; the air drying time is determined by the water content of soil, the intensity of sunlight and the intensity of wind, and is generally 24 hours, and can be 36 hours or 48 hours;
6) excavating at the third stage, namely excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated at the outermost side again, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated at the outermost side; meanwhile, the second excavator is re-excavated to a new hard shell layer at the starting end of the middle strip area to be excavated, and the second excavator gradually retreats and excavates on the new hard shell layer along the extending direction of the middle strip area to be excavated; simultaneously, open the third platform excavator to the innermost hard shell layer of waiting to dig the initial end of strip district, wait to dig the extending direction in strip district gradually along the innermost and move back and dig, form three excavator, three step, terraced field formula and dig, in the foundation ditch excavation process and before forming the hard shell layer, forbid the original soil that exposes in the excavation back foundation soil to suffer the disturbance, promptly: the excavator can not be dug down and people can not be dug down;
7) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, the strip area to be excavated in the middle and the strip area to be excavated on the innermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form three new hard shell layers; the air drying time is determined by the water content of soil, the intensity of sunlight and the intensity of wind, and is generally 24 hours, and can be 36 hours or 48 hours;
8) and sequentially and repeatedly digging according to the step 6) and the step 7) until a foundation pit meeting the construction requirement is formed. As the three groups of excavators can create three new crust layers every day, namely three working surfaces, in future, the three groups of excavators can be constructed continuously under full load.
The drainage system is distributed around the region of the foundation pit to be excavated, accumulated water on the soft soil is intermittently drained out of the foundation pit, and the soft soil is enabled to be quickly air-dried to form a new hard shell layer.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A method for excavating a foundation pit on soft soil with water content of more than 60% is characterized by comprising the following steps: the method comprises the following steps:
1) dividing a foundation pit area to be excavated into three strip areas to be excavated, wherein the three strip areas to be excavated are respectively planned to be provided with a first excavator, a second excavator and a third excavator;
2) carrying out first-stage excavation, namely excavating the first group of excavating machines into the outermost side strip area to be excavated, stopping on the hard shell layer at the starting end of the outermost side strip area to be excavated, and then gradually retreating and excavating along the extending direction of the outermost side strip area to be excavated;
3) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form a new hard shell layer;
4) performing second-stage excavation, namely re-excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated on the outermost side, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated on the outermost side; meanwhile, the second excavator is driven to the hard shell layer at the starting end of the middle strip area to be excavated and gradually retreats and excavates along the extending direction of the middle strip area to be excavated;
5) exposing original soil in foundation soil after excavating the strip area to be excavated at the outermost side and the strip area to be excavated in the middle, and gradually drying the exposed original soil in the foundation soil by the sun, wind and air to form two new hard shell layers;
6) excavating at the third stage, namely excavating the first excavator to a new hard shell layer at the starting end of the strip area to be excavated at the outermost side again, and gradually retreating and excavating on the new hard shell layer along the extending direction of the strip area to be excavated at the outermost side; meanwhile, the second excavator is re-excavated to a new hard shell layer at the starting end of the middle strip area to be excavated, and the second excavator gradually retreats and excavates on the new hard shell layer along the extending direction of the middle strip area to be excavated; simultaneously, the third excavator is driven to the hard shell layer at the starting end of the innermost strip area to be excavated and gradually retreats and excavates along the extending direction of the innermost strip area to be excavated to form three excavators, three steps and terrace type excavation;
7) exposing original soil in foundation soil after excavating the strip area to be excavated on the outermost side, the strip area to be excavated in the middle and the strip area to be excavated on the innermost side, and gradually drying the exposed original soil in the foundation soil by sun, wind and air to form three new hard shell layers;
8) and sequentially and repeatedly digging according to the step 6) and the step 7) until a foundation pit meeting the construction requirement is formed.
2. A method of excavating a foundation pit on soft soil having a water content greater than 60% as claimed in claim 1, wherein: in the process of excavation of the foundation pit, the exposed original soil in the foundation soil is prohibited from being disturbed after excavation.
3. A method of excavating a foundation pit on soft soil having a water content greater than 60% as claimed in claim 1, wherein: and 3) air-drying the soft soil for 24-48 h.
4. A method of excavating a foundation pit on soft soil having a water content greater than 60% as claimed in claim 1, wherein: and 5) air-drying the soft soil for 24-48 h.
5. A method of excavating a foundation pit on soft soil having a water content greater than 60% as claimed in claim 1, wherein: and in the step 7), the air drying time of the soft soil is 24-48 h.
6. A method of excavating a foundation pit on soft soil having a water content greater than 60% as claimed in claim 1, wherein: and arranging drainage systems around the region of the foundation pit to be excavated, and intermittently draining accumulated water on the soft soil out of the foundation pit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810143220.8A CN108343067B (en) | 2018-02-11 | 2018-02-11 | Method for excavating foundation pit on soft soil with water content of more than 60 percent |
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| CN201810143220.8A CN108343067B (en) | 2018-02-11 | 2018-02-11 | Method for excavating foundation pit on soft soil with water content of more than 60 percent |
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| CN108343067A CN108343067A (en) | 2018-07-31 |
| CN108343067B true CN108343067B (en) | 2020-02-07 |
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| CN114086566B (en) * | 2021-11-10 | 2023-01-17 | 中铁第四勘察设计院集团有限公司 | Long and narrow soft soil foundation pit excavation support and soil transportation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102535474A (en) * | 2010-12-13 | 2012-07-04 | 五冶集团上海有限公司 | Construction method for deep-foundation pit excavation |
| CN104988929A (en) * | 2015-07-03 | 2015-10-21 | 中国十七冶集团有限公司 | Unwatering method applied to high-rise building deep foundation pit muddy earthwork excavation |
| CN107214189A (en) * | 2017-07-19 | 2017-09-29 | 河北煜环环保科技有限公司 | A kind of organic material contaminated soil renovation technique |
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- 2018-02-11 CN CN201810143220.8A patent/CN108343067B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477744A (en) * | 2010-11-23 | 2012-05-30 | 中国二十冶集团有限公司 | Pit excavation method in large-area pit with internal support under condition of soft soil foundation |
| CN102535474A (en) * | 2010-12-13 | 2012-07-04 | 五冶集团上海有限公司 | Construction method for deep-foundation pit excavation |
| CN104988929A (en) * | 2015-07-03 | 2015-10-21 | 中国十七冶集团有限公司 | Unwatering method applied to high-rise building deep foundation pit muddy earthwork excavation |
| CN107214189A (en) * | 2017-07-19 | 2017-09-29 | 河北煜环环保科技有限公司 | A kind of organic material contaminated soil renovation technique |
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