CN111501768A - Method for synchronous construction of deep and shallow foundation pit groups - Google Patents
Method for synchronous construction of deep and shallow foundation pit groups Download PDFInfo
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- CN111501768A CN111501768A CN202010356205.9A CN202010356205A CN111501768A CN 111501768 A CN111501768 A CN 111501768A CN 202010356205 A CN202010356205 A CN 202010356205A CN 111501768 A CN111501768 A CN 111501768A
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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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
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Abstract
The invention provides a method for synchronously constructing deep and shallow foundation pit groups, which comprises the following steps: firstly, synchronously excavating a first layer of soil and a shallow foundation pit earthwork of a deep foundation pit, carrying out first support construction on the excavated deep foundation pit, carrying out pile head treatment and foundation construction on the excavated shallow foundation pit, wherein the shallow foundation pit comprises a first shallow foundation pit close to the deep foundation pit and a second shallow foundation pit arranged at a certain interval with the deep foundation pit, facilitating construction mechanical operation, excavating a second layer of soil of the deep foundation pit, constructing an underground structure of the first shallow foundation pit and an underground structure of the second shallow foundation pit, saving construction time and shortening construction period; then excavating bottom soil of the deep foundation pit and constructing two wing bottom plates of the deep foundation pit; carrying out underground structure construction of the deep foundation pit, and carrying out ground structure construction of the second shallow foundation pit; and after the underground structure of the deep foundation pit is completed, the construction of the overground structure of the deep foundation pit and the overground structure of the first shallow foundation pit is synchronously carried out, so that the resource allocation is facilitated, the construction period is reasonably shortened, and the safe and civilized construction is carried out.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a method for synchronously constructing deep and shallow foundation pit groups.
Background
With the development of society, more and more foundation pit group buildings appear, and most of the foundation pits have deep and shallow foundation pit designs. The sequence of the group pit construction operation often influences the safety, the construction period and the construction cost of the foundation pit. A reasonable construction method of deep and shallow foundation pit groups is formulated, and is an important measure for accelerating the construction period, ensuring the safety and reducing the cost.
Disclosure of Invention
The invention provides a method for synchronously constructing deep and shallow foundation pit groups, which shortens the construction period, ensures the construction safety and reduces the construction cost.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
synchronously excavating a first layer of soil and shallow foundation pit earthwork of a deep foundation pit, carrying out first support construction on the deep foundation pit after excavation, and carrying out pile head treatment and foundation construction on the shallow foundation pit after excavation, wherein the shallow foundation pit comprises a first shallow foundation pit close to the deep foundation pit and a second shallow foundation pit arranged at a certain distance from the deep foundation pit;
after the construction of the bearing platform foundation of the first shallow foundation pit and the second shallow foundation pit close to the deep foundation pit is completed, excavating a second layer of soil of the deep foundation pit, and constructing an underground structure of the first shallow foundation pit and an underground structure of the second shallow foundation pit;
excavating bottom soil of the deep foundation pit and constructing two wing bottom plates of the deep foundation pit;
constructing an underground structure of the deep foundation pit, and constructing an above-ground structure of the second shallow foundation pit;
and synchronously constructing the ground structure of the deep foundation pit and the ground structure of the first shallow foundation pit.
The depth of the deep foundation pit is 9.9-11.3 m; the depth of the first shallow foundation pit and the depth of the second shallow foundation pit are both 1.3-2.75 m; the number of the second shallow foundation pits is multiple; and the distance between the second shallow foundation pits and the deep foundation pit is 9.9-11.3 m.
And the number of the second shallow foundation pits is even and is uniformly distributed on two sides of the deep foundation pit.
The cross section of the deep foundation pit is U-shaped, and part of the area of the deep foundation pit is surrounded on the periphery of the first shallow foundation pit.
And in the process of excavating the second layer of soil of the deep foundation pit, preferably excavating the area of the deep foundation pit close to the first shallow foundation pit.
The excavation depth of the first layer of soil of the deep foundation pit is 1.3-2.75 m; and the excavation depth of the second layer of soil of the deep foundation pit is 3-5 m.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for synchronously constructing deep and shallow foundation pit groups, which comprises the following steps: firstly, synchronously excavating a first layer of soil and a shallow foundation pit earthwork of a deep foundation pit, carrying out first support construction on the excavated deep foundation pit, carrying out pile head treatment and foundation construction on the excavated shallow foundation pit, wherein the shallow foundation pit comprises a first shallow foundation pit close to the deep foundation pit and a second shallow foundation pit arranged at a certain interval with the deep foundation pit, facilitating construction mechanical operation, excavating a second layer of soil of the deep foundation pit, constructing an underground structure of the first shallow foundation pit and an underground structure of the second shallow foundation pit, saving construction time and shortening construction period; then excavating bottom soil of the deep foundation pit and constructing two wing bottom plates of the deep foundation pit; carrying out underground structure construction of the deep foundation pit, and carrying out ground structure construction of the second shallow foundation pit; and after the underground structure of the deep foundation pit is completed, the construction of the overground structure of the deep foundation pit and the overground structure of the first shallow foundation pit is synchronously carried out, so that the resource allocation is facilitated, the construction period is reasonably shortened, and the safe and civilized construction is carried out.
Drawings
Fig. 1 is a schematic structural diagram of a deep and shallow foundation pit group in the synchronous construction method of the deep and shallow foundation pit group.
Fig. 2 is a schematic structural diagram of first-layer soil excavation of a deep foundation pit of the deep foundation pit group synchronous construction method of the invention.
Fig. 3 is a schematic structural view of second soil excavation of a deep foundation pit of the deep foundation pit group synchronous construction method of the invention.
Fig. 4 is a schematic structural view of excavation of bottom soil of a deep foundation pit according to the synchronous construction method for deep and shallow foundation pit groups of the present invention.
Fig. 5 is a schematic view of an underground structure construction structure of a deep foundation pit of the deep foundation pit group synchronous construction method of the invention.
Detailed Description
The engineering deep foundation pit area is dug to the depth of about 9.9m, the shallow foundation pit area is dug to the depth of about 2.6m, and the foundation pit edge spacing is 11m (wherein part of the shallow foundation pit is adjacent to the deep foundation pit), so that the engineering deep foundation pit group engineering is typical.
And (4) constructing the deep and shallow foundation pit groups by stages according to the enclosure design requirements. Firstly, excavating shallow foundation pit earthwork (about 2.6m), and carrying out pile head treatment and foundation construction; synchronously excavating the first layer soil of the deep foundation pit, and starting construction of a trestle plate; after the bearing platform foundation of the shallow foundation pit close to the deep foundation pit is finished, excavating second-layer soil of the deep foundation pit, and continuously constructing an underground structure in the shallow foundation pit; excavating bottom soil of the deep foundation pit and constructing a bottom plate, wherein construction is performed at a position close to the shallow foundation pit; and after the deep foundation pit is close to the bottom plate of the shallow foundation pit, the overground structure of the shallow foundation pit area starts to be constructed. In addition, the ground structure of the shallow foundation pit close to the deep foundation pit needs to be carried out after the basement in the deep foundation pit area is finished. On the premise of ensuring the safety of the foundation pit, the construction technology optimizes the construction organization, refines the construction flow and realizes the smooth completion of deep and shallow foundation pit group construction.
The following will further describe a method for synchronous construction of deep and shallow foundation pit groups according to the present invention with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 5, a method for synchronous construction of deep and shallow foundation pit groups includes the following steps:
the method comprises the steps that firstly, a first layer of soil and shallow foundation pit earthwork of a deep foundation pit 1 are synchronously excavated, a first support 11 construction is carried out on the excavated deep foundation pit 1, pile head treatment and foundation construction are carried out on the excavated shallow foundation pit, and the shallow foundation pit comprises a first shallow foundation pit 2 close to the deep foundation pit 1 and a second shallow foundation pit 3 arranged at a certain distance from the deep foundation pit 1;
the pile head processing step comprises the steps of performing necessary pile cutting and core filling work on the tubular pile after earthwork excavation, wherein the tubular pile is a prefabricated tubular pile in the embodiment of the invention;
the foundation construction of the shallow foundation pit comprises the construction of a foundation beam and the construction of a bearing platform foundation, wherein the bearing platform is a connection part of piles and columns or piers, and the bearing platform connects a plurality of piles or even more than ten piles together to form a pile foundation;
step two, after the construction of the bearing platform foundation of the first shallow foundation pit 2 and the second shallow foundation pit 3 close to the deep foundation pit 2 is completed, excavating a second layer of soil of the deep foundation pit 1, and constructing the underground structure of the first shallow foundation pit 2 and the underground structure of the second shallow foundation pit 3;
thirdly, excavating bottom soil of the deep foundation pit 1 and constructing two wing bottom plates of the deep foundation pit 1;
step four, after the deep foundation pit 1 is close to the bottom plate 14 of the shallow foundation pit, the construction of the underground structure 13 of the deep foundation pit 1 is carried out, and the construction of the ground structure 31 of the second shallow foundation pit is carried out;
and step five, after the underground structure 13 of the deep foundation pit is finished, the construction of the ground structure of the deep foundation pit 1 and the ground structure 21 of the first shallow foundation pit is synchronously carried out.
According to the method for synchronously constructing the deep and shallow foundation pit groups, when the first layer soil of the deep foundation pit 1 is excavated and the first support 11 is constructed, the first shallow foundation pit 2 close to the deep foundation pit 1 and the second shallow foundation pit 3 arranged at a certain distance from the deep foundation pit 1 are synchronously excavated, the excavated first shallow foundation pit 2 and the excavated second shallow foundation pit 3 are subjected to pile head treatment and foundation construction, the first layer soil of the deep foundation pit 1 is synchronously excavated with the first shallow foundation pit 2 and the second shallow foundation pit 3, and synchronous operation of construction machinery is facilitated; the second layer of soil of the deep foundation pit 1 is excavated, and the underground structures of the first shallow foundation pit 2 and the second shallow foundation pit 3 are constructed, so that the construction time is saved; then, excavating bottom soil of the deep foundation pit 1 and constructing two-wing bottom plates of the deep foundation pit 1, after the two-wing bottom plates of the deep foundation pit 1 are finished, constructing an underground structure 13 of the deep foundation pit, and constructing an overground structure 31 of a second shallow foundation pit; and finally, the ground structure of the deep foundation pit and the ground structure 21 of the first shallow foundation pit are synchronously constructed, so that resource allocation is facilitated, the construction period is reasonably shortened, and safe and civilized construction is realized.
The depth of the deep foundation pit 1 is 9.9-11.3 m; the depths of the first shallow foundation pit 2 and the second shallow foundation pit 3 are both 1.3 m-2.75 m; the number of the second shallow foundation pits 3 is multiple; the distance between the second shallow foundation pits 3 and the deep foundation pit 1 is 9.9-11.3 m.
The number of the second shallow foundation pits 3 is even and the second shallow foundation pits are uniformly distributed on two sides of the deep foundation pit 1;
as shown in fig. 1, in the embodiment of the present invention, the number of the second shallow foundation pits 3 is 6, three second shallow foundation pits are distributed on each of the left and right sides of the deep foundation pit 1, and in the excavation process of the second shallow foundation pit 3, the foundation pits on the left and right sides are excavated simultaneously, and soil is removed to maintain balance, the cross section of the deep foundation pit 1 is U-shaped, and a part of the area of the deep foundation pit 1 is surrounded by the first shallow foundation pit 2.
In the process of excavating the second layer of soil of the deep foundation pit 1, the area of the deep foundation pit 1, which is adjacent to the first shallow foundation pit 2, is preferentially excavated.
The excavation depth of the first layer of soil of the deep foundation pit 1 is 1.3-2.75 m; the excavation depth of the second layer of soil of the deep foundation pit 1 is 3 m-5 m.
After foundation construction of the shallow foundation pit within 130m of the deep foundation pit is completed, excavating a second layer of soil and supporting construction in the deep foundation pit 1; and then the shallow foundation is orderly constructed with the foundation and the underground structure. The completion of foundation construction within the range of 30m ensures the construction process of the deep foundation pit 1, and the influence on the shallow foundation is minimum.
The area of the deep foundation pit 1 is positive and negative, the deformation area of the foundation pit is stable, the first shallow foundation pit 2 adjacent to the deep foundation pit 1 and the area of the deep foundation pit 1 are synchronously constructed on the ground, and the deformation influence among the single bodies is small.
Compared with the prior art, the invention has the beneficial effects that:
the reasonable arrangement of the construction steps of each procedure in the construction process of the construction engineering can effectively shorten the period and save the cost, and in view of the reason, the invention provides a method for synchronously constructing deep and shallow foundation pit groups, which comprises the following steps: firstly, synchronously excavating a first layer of soil and a shallow foundation pit earthwork of a deep foundation pit, carrying out first support construction on the excavated deep foundation pit, carrying out pile head treatment and foundation construction on the excavated shallow foundation pit, wherein the shallow foundation pit comprises a first shallow foundation pit close to the deep foundation pit and a second shallow foundation pit arranged at a certain interval with the deep foundation pit, facilitating construction mechanical operation, excavating a second layer of soil of the deep foundation pit, constructing an underground structure of the first shallow foundation pit and an underground structure of the second shallow foundation pit, saving construction time and shortening construction period; then excavating bottom soil of the deep foundation pit and constructing two wing bottom plates of the deep foundation pit; carrying out underground structure construction of the deep foundation pit, and carrying out ground structure construction of the second shallow foundation pit; and after the underground structure of the deep foundation pit is completed, the construction of the overground structure of the deep foundation pit and the overground structure of the first shallow foundation pit is synchronously carried out, so that the resource allocation is facilitated, the construction period is reasonably shortened, and the safe and civilized construction is carried out.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
Claims (10)
1. A method for synchronously constructing deep and shallow foundation pit groups is characterized by comprising the following steps:
synchronously excavating a first layer of soil and shallow foundation pit earthwork of a deep foundation pit, carrying out first support construction on the deep foundation pit after excavation, and carrying out pile head treatment and foundation construction on the shallow foundation pit after excavation, wherein the shallow foundation pit comprises a first shallow foundation pit close to the deep foundation pit and a second shallow foundation pit arranged at a certain distance from the deep foundation pit;
excavating a second layer of soil of the deep foundation pit, and constructing an underground structure of the first shallow foundation pit and an underground structure of the second shallow foundation pit;
excavating bottom soil of the deep foundation pit and constructing two wing bottom plates of the deep foundation pit;
constructing an underground structure of the deep foundation pit, and constructing an above-ground structure of the second shallow foundation pit;
and synchronously constructing the ground structure of the deep foundation pit and the ground structure of the first shallow foundation pit.
2. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: the depth of the deep foundation pit is 9.9-11.3 m.
3. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: the depth of the first shallow foundation pit and the depth of the second shallow foundation pit are both 1.3 m-2.75 m.
4. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: the number of the second shallow foundation pits is multiple.
5. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 4, wherein: and the distance between the second shallow foundation pits and the deep foundation pit is 9.9-11.3 m.
6. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 5, wherein: and the number of the second shallow foundation pits is even and is uniformly distributed on two sides of the deep foundation pit.
7. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: the cross section of the deep foundation pit is U-shaped, and part of the area of the deep foundation pit is surrounded on the periphery of the first shallow foundation pit.
8. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: and in the process of excavating the second layer of soil of the deep foundation pit, preferably excavating the area of the deep foundation pit close to the first shallow foundation pit.
9. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: the excavation depth of the first layer of soil of the deep foundation pit is 1.3-2.75 m.
10. The method for synchronously constructing the deep and shallow foundation pit groups according to claim 1, wherein: and the excavation depth of the second layer of soil of the deep foundation pit is 3-5 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010356205.9A CN111501768B (en) | 2020-04-29 | 2020-04-29 | Method for synchronous construction of deep and shallow foundation pit groups |
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| CN202010356205.9A CN111501768B (en) | 2020-04-29 | 2020-04-29 | Method for synchronous construction of deep and shallow foundation pit groups |
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| CN111501768A true CN111501768A (en) | 2020-08-07 |
| CN111501768B CN111501768B (en) | 2022-03-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737857A (en) * | 2021-10-09 | 2021-12-03 | 中国建筑第二工程局有限公司 | Be used for deep pipe gallery structure and major structure to build connection structure again and worker's method thereof |
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| CN107313431A (en) * | 2017-08-02 | 2017-11-03 | 中铁隧道集团二处有限公司 | Close on not contour foundation ditch method for synchronously constructing |
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2020
- 2020-04-29 CN CN202010356205.9A patent/CN111501768B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107313431A (en) * | 2017-08-02 | 2017-11-03 | 中铁隧道集团二处有限公司 | Close on not contour foundation ditch method for synchronously constructing |
| CN110158600A (en) * | 2019-06-05 | 2019-08-23 | 浙江交工集团股份有限公司 | A kind of Adjacent Pit synchronizes the construction method of the asynchronous backfill of excavation |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113737857A (en) * | 2021-10-09 | 2021-12-03 | 中国建筑第二工程局有限公司 | Be used for deep pipe gallery structure and major structure to build connection structure again and worker's method thereof |
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