CN113089680A - Method for realizing excavation-following and supporting partitioned excavation of foundation pit by utilizing artificial freezing method - Google Patents
Method for realizing excavation-following and supporting partitioned excavation of foundation pit by utilizing artificial freezing method Download PDFInfo
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- CN113089680A CN113089680A CN202110409857.9A CN202110409857A CN113089680A CN 113089680 A CN113089680 A CN 113089680A CN 202110409857 A CN202110409857 A CN 202110409857A CN 113089680 A CN113089680 A CN 113089680A
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- excavation
- flat plate
- foundation pit
- freezing
- soil body
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D19/14—Restraining of underground water by damming or interrupting the passage of underground water by freezing the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention discloses a method for realizing excavation of foundation pit areas along with excavation by utilizing an artificial freezing method, which is suitable for the technical field of construction of urban underground engineering. And vertically jacking the freezing cold plates in advance in the periphery of the excavation area of the foundation pit in the water-rich area, and then resisting the surrounding water and soil pressure by using the freezing cold plates and a freezing wall maintenance structure formed outside the freezing cold plates, isolating underground water and keeping the stability of soil outside the excavation range. And respectively ejecting the freezing cold plates into the stratum to surround the foundation pit according to the size of the excavation range of the foundation pit, continuously ejecting new freezing cold plates into the un-excavated stratum along the freezing cold plates when the depth of one freezing cold plate is excavated, and continuously excavating the soil body in the foundation pit downwards until the construction of the whole foundation pit is completed under the common maintenance action of freezing to form a frozen wall and freezing the cold plates. The method has simple steps and good use effect, the freezing cold plate can be reused, the size of the freezing cold plate can be adjusted at any time according to the excavation process and the surrounding stratum conditions, and the construction is flexible.
Description
Technical Field
The invention relates to a foundation pit partitioned excavation method, in particular to a foundation pit partitioned excavation method which is applicable to the technical field of construction of urban underground engineering and realizes excavation-following support by utilizing an artificial freezing method
Background
In the construction of foundation pit engineering, along with the excavation of the soil body in the foundation pit, the stability of the soil body around the excavation range needs to be maintained, so that maintenance structures are generally required to be arranged around the excavation range of the foundation pit. At present, most of commonly used maintenance structures are underground continuous walls, and the underground continuous walls with the depth far exceeding the depth of a foundation pit need to be arranged around the foundation pit in advance before excavation, so that construction preparation time before excavation is long, and the design and construction pertinence of the underground continuous walls is not strong because no excavation process reveals the geological conditions of the stratum. The freezing wall is also used for providing the maintenance function of the surrounding soil body in the excavation process of the foundation pit in the construction process, namely, a single freezing pipe with the depth far exceeding the depth of the foundation pit is arranged on the periphery of the foundation pit, and an integral freezing curtain is formed through the freezing function of the freezing pipe, so that the strength of the surrounding soil body is improved, the underground water is isolated, and the maintenance function in the excavation process is achieved. In the freezing construction method, not only the time for freezing preparation before excavation is long, but also the time required for excavating the foundation pit to the bottom is long, so the thickness of the freezing curtain formed at the lower part far exceeds the required size, and the freezing cost is increased and wasted. More importantly, before the freezing pipe is constructed, visual data of geological conditions of the stratum are lacked, so that the freezing design and construction pertinence is not strong.
Aiming at the problems, a new construction method is provided, namely, the foundation pit zoning excavation method supporting along with excavation is realized by utilizing an artificial freezing method, the preparation work before excavation of the foundation pit is reduced, and the excavation construction of the foundation pit can be started as soon as possible. Along with the requirements of excavation and stratum exposure conditions and the surrounding environment, the freezing basic parameters can be adjusted at any time, and the construction pertinence is stronger. The freezing cold plates are arranged and the freezing wall is formed along with excavation, so that the freezing time can be adjusted and controlled, and the waste of cold energy is avoided. The expansion of frozen soil outside the freezing cold plates can plug the joints between the freezing cold plates, avoid water leakage at the positions of the joints, and the adjustment of the sizes of the freezing cold plates can realize the layered and partitioned excavation of soil bodies in the foundation pit and improve the technical level of construction organization.
Disclosure of Invention
Aiming at the technical problems, the invention provides a working method, which can realize the excavation of the foundation pit in different areas along with excavation by utilizing an artificial freezing method under the condition that a frozen wall formed by utilizing the artificial freezing method can be used as a temporary supporting structure in the foundation pit excavation engineering.
In order to achieve the technical purpose, the invention discloses a method for realizing excavation of a foundation pit in a partitioned mode along with excavation and support by utilizing an artificial freezing method, which is characterized by comprising the following steps of: vertically jacking a flat plate freezer into soil around a foundation pit in an ascites area until the flat plate freezer is integrally buried into the soil at the periphery of the foundation pit to be excavated, so that the outer side of the area to be excavated is completely surrounded by the flat plate freezer, the flat plate freezer is integrally buried into the soil, and the soil outside the edge of the foundation pit to be excavated is frozen by using the flat plate freezer, so that a freezing curtain is formed in the soil tightly attached to the outer side of the flat plate freezer, thereby improving the strength of the soil outside the flat plate freezer and isolating underground water; under the common maintenance action of the flat plate freezer and the freezing curtain, carrying out partitioned and layered excavation on a soil body in a foundation pit excavation range which is formed by the flat plate freezer and the freezing curtain and surrounds the inner side; when the soil body in the first partition is excavated to the bottom of the flat plate freezer which is vertically jacked from the ground surface, the flat plate freezer is continuously jacked into the lower-layer soil body in a manner of being close to the inner side of the existing flat plate freezer in an advancing manner, the newly jacked flat plate freezer is used for freezing the soil body on the outer side of the flat plate freezer to form a new freezing curtain area, the soil body in the next partition is continuously excavated in the new freezing curtain area, and the flat plate freezer is repeatedly jacked into the lower-layer soil body, frozen to form a new freezing curtain, and the soil body is excavated until the excavation of the foundation pit is completed.
The method comprises the following specific steps:
a. firstly, sequentially and vertically jacking a plurality of flat plate freezers downwards in a soil body around the foundation pit excavation outside a foundation pit excavation range, enabling the flat plate freezers to completely surround the foundation pit excavation range, controlling gaps between adjacent flat plate freezers, and uniformly arranging all the flat plate freezers at the boundary of the foundation pit excavation range;
b. freezing soil outside the flat plate freezers by using the flat plate freezers so as to form a freezing curtain with a certain thickness for resisting the water and soil pressure around the foundation pit and isolating underground water outside the flat plate freezers;
c. under the cooperative maintenance of the flat plate freezer and the freezing curtain, constructing the soil body in the foundation pit in a partition excavation mode;
d. the method comprises the following steps of carrying out regional division on a foundation pit in a partitioned excavation process, simultaneously dividing regional layer height according to the height of a used flat plate freezer, firstly excavating soil in a zone I1, forming a partitioned excavation surface when excavating to the position close to the lower edge of the currently installed flat plate freezer, then downwards jacking a new flat plate freezer along an excavation range, and constructing a freezing curtain of the soil in the zone I2;
e. d, when the new flat plate freezer freezes the soil body in the area I2, continuously excavating the soil body in the area II 1 in the horizontal direction, repeating the operation of the step d, and after the excavation of the soil bodies in the areas III and IV is finished in sequence by analogy, continuously excavating the area I2, and repeating the operation of the step d in the same way until the excavation of the foundation pit is finished;
f. after the foundation pit is excavated, sequentially carrying out upward layering construction from a foundation pit bottom plate;
g. along with the upward construction of the structure, sequentially pulling out the flat plate freezers around the construction range of the structure, and unfreezing the surrounding stratum to recover to an initial state;
h. and (5) maintaining the recovered flat plate freezer for the next project.
The size, the arrangement depth, the arrangement form of freezing pipes and the thickness of a formed freezing wall of the flat plate freezer can be adjusted at any time according to stratum conditions and excavation working conditions so as to control the deformation of the peripheral stratum after excavation.
A joint space is reserved between two adjacent flat plate freezers arranged in the foundation pit, frozen soil in the joint space transversely expands during freezing, and a freezing curtain can be formed between different flat plate freezers, so that an integral freezing curtain is formed around the foundation pit to block water leakage at the joint position of the flat plate freezers.
Has the advantages that: the method focuses on an artificial freezing method to form a freezing wall which meets the strength use of a temporary supporting structure, the freezing wall plays roles of sealing, supporting and water proofing, the flat plate freezer can be used for excavating the foundation pit engineering in a more flexible region division and layering mode, a supporting structure does not need to be arranged in advance, the problem of long preparation time is avoided, and the region to be excavated can be frozen while excavating, so that the continuous construction of the layered and the partitioned areas of the foundation pit is realized, and the requirement of foundation pit construction is met.
Drawings
FIG. 1 is a schematic diagram of a method for realizing excavation-following foundation pit partition excavation by using an artificial freezing method.
In the figure: 1-plate freezer, 2-freezing curtain, 3-excavation range of foundation pit, 4-partitioned excavation surface and 5-soil body
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced.
As shown in the attached drawing 1, the invention utilizes the artificial freezing method to realize the foundation pit subarea excavation method supporting along with excavation, the periphery of the foundation pit to be excavated area in the water-rich area vertically jacks the flat plate freezer 1 into the foundation pit periphery soil body 5 until the flat plate freezer 1 is integrally buried into the soil body 5, thereby the outer side of the area to be excavated is completely surrounded by the flat plate freezer 1, the flat plate freezer 1 is integrally buried into the soil body 5, the flat plate freezer 1 is utilized to freeze the soil body on the outer side of the edge of the foundation pit to be excavated, thereby a freezing curtain 2 is formed in the soil body 5 tightly attached to the outer side of the flat plate freezer 1, thereby the strength of the soil body 5 on the outer side of the flat plate freezer 1 is improved and the underground water is isolated; under the common maintenance action of the flat plate freezer 1 and the freezing curtain 2, performing partitioned and layered excavation on a soil body in a foundation pit excavation range 3 which is formed by the flat plate freezer 1 and the freezing curtain 2 and surrounds the inner side; when the soil body in the first partition is excavated to the bottom of the flat plate freezer 1 which is vertically jacked from the ground surface, the flat plate freezer 1 is continuously jacked into the lower-layer soil body in a forward mode by clinging to the inner side of the existing flat plate freezer 1, the newly jacked flat plate freezer 1 is used for freezing the soil body on the outer side of the flat plate freezer 1 to form a new frozen curtain area, the soil body in the next partition is continuously excavated in the new frozen curtain area, the flat plate freezer 1 is repeatedly jacked into the lower-layer soil body, the freezing is performed to form a new frozen curtain 2, and the soil body 5 is excavated until the excavation of the foundation pit is completed.
The method comprises the following specific steps:
a. firstly, sequentially and vertically jacking a plurality of flat plate freezers 1 downwards in a foundation pit excavation surrounding soil body 5 outside a foundation pit excavation range 3, enabling the flat plate freezers 1 to completely surround the foundation pit excavation range 3, controlling gaps between adjacent flat plate freezers 1, and uniformly arranging all the flat plate freezers 1 on the boundary of the foundation pit excavation range 3; the flat plate freezer 1 is a rectangular steel plate provided with a spiral pipeline, or a spiral pipeline is welded between two steel plates, the size, the arrangement depth, the arrangement form of freezing pipes and the thickness of a formed freezing wall of the flat plate freezer 1 can be adjusted at any time according to stratum conditions and excavation working conditions so as to control the deformation of the peripheral stratum after excavation;
b. freezing the soil body 5 outside the flat plate freezers 1 by using the flat plate freezers 1 so as to form a freezing curtain 2 which has a certain thickness and is used for resisting the water and soil pressure around the foundation pit and isolating the underground water outside the flat plate freezers 1; a joint space is reserved between two adjacent flat plate freezers 1 arranged in a foundation pit, frozen soil in the joint space transversely expands during freezing, and a freezing curtain can be formed between different flat plate freezers 1, so that an integral freezing curtain 2 is formed around the foundation pit to block water leakage at the joint position of the flat plate freezers 1;
c. under the cooperative maintenance of the flat plate freezer 1 and the freezing curtain 2, constructing a soil body 5 in the foundation pit in a partition excavation mode;
d. the method comprises the following steps of carrying out regional division on a foundation pit in a partitioned excavation process, simultaneously dividing regional layer height according to the height of a used flat plate freezer 1, firstly excavating soil in a region I1, forming a partitioned excavation surface 4 when excavating to the position close to the lower edge of the currently installed flat plate freezer 1, then downwards jacking a new flat plate freezer 1 along an excavation range, and constructing a freezing curtain 2 of 2 layers of soil 5 in the region I;
e. d, when the new flat plate freezer 1 freezes the soil body 5 in the area I2, continuously excavating the soil body in the area II 1 in the horizontal direction, repeating the operation of the step d, and after the excavation of the soil bodies in the areas III and IV is finished in sequence by analogy, continuously excavating the area I2, and repeating the operation of the step d in the same way until the excavation of the foundation pit is finished;
f. after the foundation pit is excavated, sequentially carrying out upward layering construction from a foundation pit bottom plate;
g. with the upward construction of the structure, the flat plate freezers 1 around the construction range of the structure are sequentially pulled out, and the surrounding strata are unfrozen and recovered to the initial state;
h. and (5) maintaining the recovered flat plate freezer 1 for the next project.
Claims (4)
1. A method for realizing excavation of foundation pit subareas along with excavation and support by utilizing an artificial freezing method is characterized by comprising the following steps of: vertically jacking a flat plate freezer (1) into a soil body (5) at the periphery of a region to be excavated of a foundation pit in a water-rich region until the flat plate freezer (1) is integrally buried in the soil body (5), so that the outer side of the region to be excavated is completely surrounded by the flat plate freezer (1), the flat plate freezer (1) is integrally buried in the soil body (5), freezing the soil body at the outer side of the edge of the foundation pit to be excavated by utilizing the flat plate freezer (1), and forming a freezing curtain (2) in the soil body (5) tightly attached to the outer side of the flat plate freezer (1), thereby improving the strength of the soil body (5) at the outer side of the flat plate freezer (1) and isolating underground water; under the common maintenance action of the flat plate freezer (1) and the freezing curtain (2), performing partitioned and layered excavation on a soil body in a foundation pit excavation range (3) which is formed by the flat plate freezer (1) and the freezing curtain (2) and surrounds the inner side; when the soil body in the first partition is excavated to the bottom of the flat plate freezer (1) which is vertically jacked from the ground surface, the flat plate freezer (1) is tightly attached to the inner side of the existing flat plate freezer (1) and continuously jacked into the lower-layer soil body in advance, the soil body on the outer side of the flat plate freezer (1) is frozen by the new jacked flat plate freezer (1) to form a new frozen curtain area, the soil body in the next partition is continuously excavated in the new frozen curtain area, the flat plate freezer (1) is repeatedly jacked into the lower-layer soil body repeatedly, a new frozen curtain (2) is formed by freezing, and the soil body (5) is excavated until the excavation of the foundation pit is completed.
2. The method for realizing excavation-following foundation pit partition excavation by utilizing the artificial freezing method according to claim 1, which is characterized by comprising the following specific steps of:
a. firstly, sequentially and vertically jacking a plurality of flat plate freezers (1) downwards in a foundation pit excavation surrounding soil body (5) outside a foundation pit excavation range (3), enabling the flat plate freezers (1) to completely surround the foundation pit excavation range (3), controlling gaps between adjacent flat plate freezers (1), and uniformly arranging all the flat plate freezers (1) on the boundary of the foundation pit excavation range (3);
b. freezing soil bodies (5) outside the flat plate freezers (1) by using the flat plate freezers (1) so as to form a freezing curtain (2) with a certain thickness for resisting the water and soil pressure around the foundation pit and isolating underground water on the outer side of the flat plate freezers (1);
c. under the cooperative maintenance of the flat plate freezer (1) and the freezing curtain (2), constructing a soil body (5) in the foundation pit in a partition excavation mode;
d. the method comprises the following steps of carrying out regional division on a foundation pit in a partitioned excavation process, simultaneously dividing regional layer height according to the height of a used flat plate freezer (1), firstly excavating soil in a zone I1, forming a partitioned excavation surface (4) when excavating to the position close to the lower edge of the currently installed flat plate freezer (1), then downwards jacking a new flat plate freezer (1) along an excavation range, and constructing a freezing curtain (2) of 2 layers of soil (5) in the zone I;
e. d, when the new flat plate freezer (1) freezes the soil body (5) in the 2 layers of the I area, the excavation of the soil body in the 1 layers of the II area in the horizontal direction is continued, the operation of the step d is repeated, the excavation of the 1 layers of the soil body in the other areas is completed in sequence by analogy, the excavation of the 2 layers of the I area is continued, and the operation of the step d is repeated in the same way until the excavation of the foundation pit is completed;
f. after the foundation pit is excavated, sequentially carrying out upward layering construction from a foundation pit bottom plate;
g. along with the upward construction of the structure, the flat plate freezers (1) around the construction range of the structure are sequentially pulled out, and the surrounding strata are unfrozen and recovered to the initial state;
h. and (4) curing the recovered flat plate freezer (1) for the next project.
3. The method for achieving excavation-following partition of the foundation pit by using the artificial freezing method as claimed in claim 2, wherein: the plate freezer (1) is a rectangular steel plate with a spiral pipeline, or a spiral pipeline is welded between two steel plates, and the size, the arrangement depth, the arrangement form of freezing pipes and the thickness of a formed freezing wall of the plate freezer (1) can be adjusted at any time according to stratum conditions and excavation working conditions so as to control the deformation of the peripheral stratum after excavation.
4. The method for achieving excavation-following partition of the foundation pit by using the artificial freezing method as claimed in claim 2, wherein: a joint space is reserved between two adjacent flat plate freezers (1) arranged in a foundation pit, frozen soil in the joint space transversely expands during freezing, and a freezing curtain can be formed between different flat plate freezers (1), so that an integral freezing curtain (2) is formed around the foundation pit to block water leakage at the joint position of the flat plate freezers (1).
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| CN202110409857.9A CN113089680B (en) | 2021-04-16 | 2021-04-16 | Method for realizing excavation-following and supporting partitioned excavation of foundation pit by utilizing artificial freezing method |
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| CN202110409857.9A CN113089680B (en) | 2021-04-16 | 2021-04-16 | Method for realizing excavation-following and supporting partitioned excavation of foundation pit by utilizing artificial freezing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114134903A (en) * | 2021-12-11 | 2022-03-04 | 中冶建筑研究总院（深圳）有限公司 | Deep and large foundation pit soil body advanced reinforcement method in soft soil area based on horizontal freezing method |
| CN116464086A (en) * | 2023-06-19 | 2023-07-21 | 中铁建工集团有限公司 | Building foundation pit construction equipment and building foundation pit construction method |
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Cited By (3)
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| CN114134903A (en) * | 2021-12-11 | 2022-03-04 | 中冶建筑研究总院（深圳）有限公司 | Deep and large foundation pit soil body advanced reinforcement method in soft soil area based on horizontal freezing method |
| CN116464086A (en) * | 2023-06-19 | 2023-07-21 | 中铁建工集团有限公司 | Building foundation pit construction equipment and building foundation pit construction method |
| CN116464086B (en) * | 2023-06-19 | 2023-10-20 | 中铁建工集团有限公司 | Building foundation pit construction equipment and building foundation pit construction method |
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