CN113174959A - Construction method for symmetrically unearthing circular foundation pit in soft soil area - Google Patents
Construction method for symmetrically unearthing circular foundation pit in soft soil area Download PDFInfo
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- CN113174959A CN113174959A CN202110392722.6A CN202110392722A CN113174959A CN 113174959 A CN113174959 A CN 113174959A CN 202110392722 A CN202110392722 A CN 202110392722A CN 113174959 A CN113174959 A CN 113174959A
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- 238000010276 construction Methods 0.000 title claims abstract description 58
- 239000002689 soil Substances 0.000 title claims abstract description 39
- 238000009412 basement excavation Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 5
- 101150054854 POU1F1 gene Proteins 0.000 description 13
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a construction method for symmetrically unearthing a circular foundation pit in a soft soil area, which comprises the following steps of: constructing a supporting structure around the circular foundation pit; dividing the circular foundation pit into a plurality of layers of construction areas from inside to outside along the radius direction, dividing each layer of the construction areas into an even number of excavation areas along the circumferential direction, and distributing the excavation areas of each layer of the construction areas in pairwise symmetry with respect to the circle center; and excavating a plurality of layers of construction areas inwards and outwards along the radius direction, and excavating the soil excavation area symmetrically when excavating each layer of construction area. The invention adopts the inward-outward circular symmetrical basin type excavation, and solves the problem of unbalanced stress of the supporting structure possibly caused in the excavation process of the circular foundation pit in the existing soft soil area. The circular foundation pit supporting structure type in the soft soil area is balanced in overall stress, unbalanced soil excavation in the foundation pit is avoided, the foundation pit construction is consistent with the design working condition, and the safety of the foundation pit is enhanced.
Description
Technical Field
The invention is used in the field of foundation pit construction, and particularly relates to a construction method for symmetrically unearthing a circular foundation pit in a soft soil area.
Background
The soft soil has the characteristics of soft plastic and flow plastic, and in the excavation process of the foundation pit, the soil body in the pit usually can creep, deform, slide and other conditions under the disturbance of heavy construction machinery, so that the state or elevation of the soil body in front of the foundation pit supporting structure has deviation from the design working condition, and the inconsistency of the construction working condition and the design working condition can be caused. For the circular foundation pit supporting structure type, the stress mode is the uniform stress of the space, the balance of the whole stress is very emphasized, and if the excavation of the soil body in the circular foundation pit in the soft soil area is unbalanced, the whole supporting structure is likely to generate the space deviation.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art and provides a construction method for symmetrically unearthing a circular foundation pit in a soft soil area.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a construction method for symmetrically unearthing a circular foundation pit in a soft soil area comprises the following steps:
constructing a supporting structure around the circular foundation pit;
dividing the circular foundation pit into a plurality of layers of construction areas from inside to outside along the radius direction, dividing each layer of the construction areas into an even number of excavation areas along the circumferential direction, and distributing the excavation areas of each layer of the construction areas in pairwise symmetry with respect to the circle center;
excavating construction areas layer by layer from inside to outside along the radius direction, and excavating symmetrical excavation areas when excavating each layer of construction area
In some embodiments, further comprising the steps of:
building unearthed ramps in the circular foundation pit, wherein the number of the unearthed ramps is even, and the even number of the unearthed ramps are distributed along the circumferential direction of the circular foundation pit;
and the soil for excavating the circular foundation pit is transported out through the unearthed ramp.
In some embodiments, a first unearthing ramp and a second unearthing ramp are built in the circular foundation pit, the included angle between the connecting lines of the first unearthing ramp and the center of the circular foundation pit is not less than 150 degrees, the circular foundation pit is divided into a first block and a second block which are semicircular, the excavated soil of an excavated area in the first block is transported out through the first unearthing ramp, and the excavated soil of an excavated area in the second block is transported out through the second unearthing ramp.
In some embodiments, further comprising the steps of:
numbering the excavated areas of the first block, wherein the number of the excavated areas is an E (#) block, and numbering the excavated areas of the second block, wherein the number of the excavated areas is a W (#) block;
wherein, is a letter, which represents a construction area; # is a number, representing an excavated area;
the number of the excavated areas distributed pairwise symmetrically about the circle center is the same, and the number of the excavated areas distributed pairwise symmetrically about the circle center is the same.
In some embodiments, the width of each layer of the construction area along the radius direction is 20-30 m.
In some embodiments, each of the excavated regions is sector-shaped.
One of the above technical solutions has at least one of the following advantages or beneficial effects: the invention adopts the inward-outward circular symmetrical basin type excavation, and solves the problem of unbalanced stress of the supporting structure possibly caused in the excavation process of the circular foundation pit in the existing soft soil area. The circular foundation pit supporting structure type in the soft soil area is balanced in overall stress, unbalanced soil excavation in the foundation pit is avoided, the foundation pit construction is consistent with the design working condition, and the safety of the foundation pit is enhanced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (east, south, west, north) are described, it is only for convenience of describing the technical solution of the present invention, and it is not indicated or suggested that the technical features referred to must have a specific orientation, be constructed in a specific orientation and operate, and thus, should not be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "not less than", "above", "below", "within" and the like are understood to include the essential numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
Fig. 1 shows a reference direction coordinate system of an embodiment of the present invention, and the following describes an embodiment of the present invention with reference to the directions shown in fig. 1.
Referring to fig. 1, an embodiment of the present invention provides a construction method for symmetric unearthing of a circular foundation pit in a soft soil area, including the following steps:
and constructing a supporting structure 2 around the circular foundation pit 1 to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. For the type 2 of the supporting structure of the circular foundation pit 1, the stress mode is that the space is uniformly stressed, and the balance of the whole stress is greatly emphasized;
dividing the circular foundation pit 1 into a plurality of layers of construction areas from inside to outside along the radius direction, dividing each layer of construction area into an even number of excavation areas along the circumferential direction, keeping the principle of symmetrical number and size of the excavation areas, and distributing the excavation areas of each layer of construction area in pairwise symmetry about the circle center;
along the radius direction, excavate the construction region outward inside by one layer, namely adopt "basin formula excavation", and when excavating each layer of construction region specifically excavate the region of digging symmetrically simultaneously, namely "symmetrical excavation".
The invention adopts the inward-outward circular symmetrical basin type excavation, and solves the problem that the stress of the supporting structure 2 is unbalanced possibly caused in the excavation process of the circular foundation pit 1 in the soft soil area. The circular foundation pit 1 supporting structure 2 type in the soft soil area is guaranteed to be balanced in overall stress, unbalanced excavation of soil in the foundation pit is avoided, foundation pit construction is guaranteed to be consistent with design working conditions, and safety of the foundation pit is enhanced.
In order to carry out the excavation of the circular excavation pit 1, in some embodiments, see fig. 1, the following steps are also included:
building unearthed ramps in the circular foundation pit 1, wherein the unearthed ramps reasonably determine the slope rate according to the depth of the foundation pit, the number of the unearthed ramps is even, and the even unearthed ramps are distributed along the circumferential direction of the circular foundation pit 1 in a roughly symmetrical mode;
the soil for excavating the circular foundation pit 1 is transported out through the unearthed ramp to meet the requirement of symmetrical unearthing, the balance of the whole stress is ensured, the unbalance of soil body excavation in the foundation pit is avoided, the foundation pit construction is ensured to be consistent with the design working condition, and the safety of the foundation pit is enhanced.
Specifically, in some embodiments, referring to fig. 1, a first unearthing ramp 3 and a second unearthing ramp 4 are built in a circular foundation pit 1, an included angle between a connecting line of the first unearthing ramp 3 and the center of the circular foundation pit 1 and a connecting line of the second unearthing ramp 4 is not less than 150 °, the first unearthing ramp 3 corresponds to a west unearthing ramp in fig. 1, the second unearthing ramp 4 corresponds to a north-east unearthing ramp in fig. 1, the circular foundation pit 1 is divided into a first block and a second block in a semicircular shape through an axis in the north-south direction, excavated soil in an excavated area in the second block is transported through the first unearthing ramp 3, excavated soil in an excavated area in the first block is transported through the second unearthing ramp 4, so that symmetrical unearthing is realized, and an arrow in fig. 1 indicates an unearthing direction.
In some embodiments, in order to strictly control the excavation sequence, the following steps are also included:
numbering the excavated areas of the first block, wherein the number is an E (#) block, and numbering the excavated areas of the second block, wherein the number is a W (#) block;
wherein, is a letter, which represents a construction area; # is a number, representing an excavated area;
the number of the excavated areas distributed pairwise symmetrically about the circle center is the same, and the number of the excavated areas distributed pairwise symmetrically about the circle center is the same.
For example, in the embodiment shown in fig. 1, the circular foundation pit 1 is divided into 4 construction areas from inside to outside, the first construction area is divided into 4 excavation areas, the first construction area is divided into 8 excavation areas, the third construction area is divided into 12 excavation areas, and the fourth construction area is divided into 12 excavation areas. The numbers of 12 excavation areas of a fourth layer of construction area are EA 1-EA 6 and WA 1-WA 6, the numbers of 12 excavation areas of a third layer of construction area are EB 1-EB 6 and WB 1-WB 6, the numbers of 8 excavation areas of a second layer of construction area are EC 1-EC 4 and WC 1-WC 4, the numbers of 4 excavation areas of a first layer of construction area are ED 1-ED 4 and WD 1-WD 4, the excavation sequence is uniformly and symmetrically excavated according to letter blocks D to A, all digital blocks of the same letter excavation area must be uniformly excavated at the same time, for example, 12 same letter blocks including EA 1-EA 6 and WA 1-WA 6 must be uniformly excavated simultaneously, the excavation of the next letter block B can be carried out after the excavation, all blocks of the letter B area must be uniformly and the excavation of the letter B area must be synchronized, and the excavation is forbidden. According to the invention, each excavation area is numbered, and excavation and unearthing are carried out according to the number strictly during excavation, so that random excavation is avoided, the balance of the whole stress is ensured, the unbalance of excavation of a soil body in the foundation pit is avoided, the foundation pit construction is ensured to be consistent with the design working condition, and the safety of the foundation pit is enhanced.
The width of each layer of construction area should not be too wide to avoid can't guaranteeing even excavation, should not also be too narrow, in order to avoid the transition to delay foundation ditch excavation work, in some embodiments, along the radius direction, the width of each layer of construction area is 20 ~ 30 m.
In some embodiments, referring to fig. 1, each excavated area is shaped to correspond to a circular foundation pit and has a fan shape, so that each excavated area can be divided by a straight line along a radius direction, thereby facilitating division, construction and numbering of the excavated areas.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (6)
1. A construction method for symmetrically unearthing a circular foundation pit in a soft soil area is characterized by comprising the following steps:
constructing a supporting structure around the circular foundation pit;
dividing the circular foundation pit into a plurality of layers of construction areas from inside to outside along the radius direction, dividing each layer of the construction areas into an even number of excavation areas along the circumferential direction, and distributing the excavation areas of each layer of the construction areas in pairwise symmetry with respect to the circle center;
and excavating construction areas layer by layer from inside to outside along the radius direction, and excavating the symmetrical excavation areas when excavating each layer of construction area.
2. The construction method for symmetric unearthing of a circular foundation pit in a soft soil area according to claim 1, further comprising the steps of:
building unearthed ramps in the circular foundation pit, wherein the number of the unearthed ramps is even, and the even number of the unearthed ramps are distributed along the circumferential direction of the circular foundation pit;
and the soil for excavating the circular foundation pit is transported out through the unearthed ramp.
3. The construction method for symmetrically unearthing a circular foundation pit in a soft soil area according to claim 2, characterized in that a first unearthed ramp and a second unearthed ramp are constructed in the circular foundation pit, the included angle between the connecting lines of the first unearthed ramp and the center of the circular foundation pit is not less than 150 degrees, the circular foundation pit is divided into a first block and a second block which are semicircular, the excavated soil of an excavated area in the second block is transported out through the first unearthed ramp, and the excavated soil of the excavated area in the first block is transported out through the second unearthed ramp.
4. The construction method for symmetric unearthing of a circular foundation pit in a soft soil area according to claim 3, further comprising the steps of:
numbering the excavated areas of the first block, wherein the number of the excavated areas is an E (#) block, and numbering the excavated areas of the second block, wherein the number of the excavated areas is a W (#) block;
wherein, is a letter, which represents a construction area; # is a number, representing an excavated area;
the number of the excavated areas distributed pairwise symmetrically about the circle center is the same, and the number of the excavated areas distributed pairwise symmetrically about the circle center is the same.
5. The construction method for symmetrically unearthing the circular foundation pit in the soft soil area according to claim 1, wherein the width of each layer of the construction area is 20-30 m in the radial direction.
6. A method of symmetrically unearthing a circular foundation pit in a soft soil area according to claim 1, wherein each of said excavated areas is sector-shaped.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110392722.6A CN113174959A (en) | 2021-04-13 | 2021-04-13 | Construction method for symmetrically unearthing circular foundation pit in soft soil area |
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| CN202110392722.6A CN113174959A (en) | 2021-04-13 | 2021-04-13 | Construction method for symmetrically unearthing circular foundation pit in soft soil area |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979102A (en) * | 2012-12-11 | 2013-03-20 | 同济大学建筑设计研究院(集团)有限公司 | Open-excavation sequential-operation deformation-control design method for deep and large circular foundation ditch in soft soil areas |
| CN109295983A (en) * | 2018-08-07 | 2019-02-01 | 中铁上海工程局集团有限公司 | Deep foundation pit earthwork digging construction method under a kind of large diameter circle truss support environment |
| CN109930608A (en) * | 2019-03-05 | 2019-06-25 | 云南建投第十二建设有限公司 | A kind of pit earthwork excavation method of peat matter weak soil |
-
2021
- 2021-04-13 CN CN202110392722.6A patent/CN113174959A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102979102A (en) * | 2012-12-11 | 2013-03-20 | 同济大学建筑设计研究院(集团)有限公司 | Open-excavation sequential-operation deformation-control design method for deep and large circular foundation ditch in soft soil areas |
| CN109295983A (en) * | 2018-08-07 | 2019-02-01 | 中铁上海工程局集团有限公司 | Deep foundation pit earthwork digging construction method under a kind of large diameter circle truss support environment |
| CN109930608A (en) * | 2019-03-05 | 2019-06-25 | 云南建投第十二建设有限公司 | A kind of pit earthwork excavation method of peat matter weak soil |
Non-Patent Citations (1)
| Title |
|---|
| 朱彬等: "深基坑开挖中土与水的问题初探", 《城市道桥与防洪》 * |
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Application publication date: 20210727 |