CN112796333A - Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof - Google Patents
Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof Download PDFInfo
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- CN112796333A CN112796333A CN202110133579.9A CN202110133579A CN112796333A CN 112796333 A CN112796333 A CN 112796333A CN 202110133579 A CN202110133579 A CN 202110133579A CN 112796333 A CN112796333 A CN 112796333A
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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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Abstract
The invention discloses a multi-elevation deep foundation pit anchoring and pulling supporting structure and a construction method thereof, wherein the multi-elevation deep foundation pit anchoring and pulling supporting structure comprises an anchor ingot structure, a force transmission structure and a retaining structure; the force transmission structure is a bidirectional reinforced concrete cushion; the retaining structure is a reinforced concrete crown beam and a supporting structure; the anchor ingot structure is a plurality of fender posts outside the soil body destruction surface; a plurality of steel bars in the concrete cushion layer of the bidirectional reinforcing bar are arranged in a single-layer bidirectional mode, and a plurality of steel bars orthogonal to the length direction of the crown beam are configured according to the reinforcing bar ratio of 0.2%; and a plurality of steel bars parallel to the length direction of the crown beam adopt a phi 8@250 distribution mode. During construction, firstly, construction piles and support piles are constructed, and earthwork is excavated to the bottom of a shallow elevation pit; then cleaning the pile heads of the engineering piles and the support piles; binding the steel bars in the crown beam and the reinforcing steel bar cushion layer; pouring concrete, and connecting the concrete cushion layer of the bidirectional reinforcing bar with the crown beam; and finally, excavating deep elevation foundation pit earthwork. The invention improves the safety and stability of the supporting structure and reduces the disturbance of the foundation soil.
Description
Technical Field
The invention relates to the technical field of underground space construction, in particular to a multi-elevation deep foundation pit anchoring and pulling supporting structure and a construction method thereof.
Background
The development of underground space not only needs to meet the requirements of building and structure functions and processes, but also is often limited by administrative regulations such as land planning in construction areas, which makes the plane and space layout of the underground space become various and complicated. In a multi-layer underground structure, the inconsistency of the plane profiles of the underground layers is a common complex underground space layout. This kind of overall arrangement is mostly shallow layer basement plane profile and is greater than deep layer basement plane profile, and deep layer basement compares shallow layer basement promptly and appears the plane and accepts into. This underground space arrangement has made a great difference in elevation appear in the multilayer underground plane, has formed a many elevation deep basal pits that has a certain scale, and the difference in elevation of this deep basal pit is one deck or multilayer basement floor height usually, and this deep basal pit does not possess the condition of putting the slope excavation usually, therefore need arrange foundation ditch supporting construction in this difference in elevation department in order to realize the excavation of standing vertically. The basement foundation pit excavation usually adopts open cut smooth-cut method, and engineering pile has been under construction before the foundation pit excavation, therefore the shallow elevation one side of many elevation deep basal pit supporting construction is the engineering pile of having been under construction, and deep elevation one side is the basement structure of waiting to build. In order to minimize disturbance to the foundation soil at shallow elevations, the supporting structure needs to be sufficiently rigid to control deformation.
There are several measures for controlling the deformation of supporting structure, generally for increasing the pile diameter of supporting pile, adding internal support and adding prestressed anchor cable. The cantilever support can be realized by increasing the pile diameter of the support pile, the construction is convenient, the soil is quickly excavated, but the method increases the cost of the support, and the deformation of the top of the cantilever support structure is generally difficult to control; the deformation of a supporting structure can be obviously controlled by arranging the inner support, but the supporting progress is hindered by the supporting, and the force transmission support of the inner support needs to be combined with the arrangement and construction sequence of an underground structure, so that the supporting arrangement becomes more complex; although the prestressed anchor cable is economical in manufacturing cost and convenient to construct, due to the fact that the constructed engineering pile exists behind the supporting pile, the arrangement of the anchor cable is greatly limited.
On the other hand, the horizontal bearing capacity of the engineering pile in the construction stage is not considered in the prior foundation pit design, the engineering pile in the shallow elevation range has certain horizontal anchoring and pulling capacity, and if the reinforcement cushion layer can be used as a conduction system to effectively utilize the capacity, the deformation of the multi-elevation deep foundation pit supporting structure can be well controlled, and the method also has the characteristics of convenience in construction and economical manufacturing cost.
In conclusion, how to make the construction operation of the multi-elevation deep foundation pit supporting structure simpler, the manufacturing cost more economic, and the engineering pile anchor can be effectively utilized to pull the multi-elevation deep foundation pit supporting structure becomes a technical problem which needs to be solved by technical personnel in the field.
Disclosure of Invention
In view of the above defects in the prior art, the invention provides a multi-elevation deep foundation pit anchoring and supporting structure and a construction method thereof, and aims to ensure the safety, economy and applicability of the multi-elevation deep foundation pit supporting structure in a complex underground space, effectively utilize the anchoring and pulling capacity of an engineering pile in a shallow elevation range, and provide a feasible technical means for the construction of the complex underground space.
In order to achieve the purpose, the invention discloses a multi-elevation deep foundation pit anchoring and pulling supporting structure which comprises an anchor ingot structure, a force transmission structure and a retaining structure.
The force transmission structure is a bidirectional reinforced concrete cushion; the supporting and retaining structures are reinforced concrete crown beams and supporting piles; the anchor ingot structure is a plurality of engineering piles outside the soil body destruction surface;
the anchoring horizontal force of a single engineering pile is determined according to the allowable horizontal displacement of the pile top and the pile diameter;
the engineering piles form a group by taking a column-four-pile form to form a plurality of groups of anchor ingot structures;
a plurality of steel bars in the concrete cushion layer of the bidirectional reinforcing bar are arranged in a single-layer bidirectional mode, a plurality of steel bars orthogonal to the length direction of the crown beam are arranged according to the reinforcing bar ratio of 0.2%, and a plurality of steel bars parallel to the length direction of the crown beam are distributed in a phi 8@250 mode;
the anchoring length of each reinforcing steel bar entering the crown beam, which is orthogonal to the length direction of the crown beam, is more than 40 times of the diameter of the corresponding reinforcing steel bar;
and the space interval between every two adjacent steel bars orthogonal to the length direction of the crown beam is not more than 150 mm.
Preferably, the pile top of the engineering pile is allowed to horizontally displace 10 mm; the pile diameter of the engineering pile is 0.5 m; the anchoring horizontal force of a single engineering pile is 70 kilonewtons; the column pitch of each group of the engineering piles comprising one column and four piles is 8 meters, and the provided anchor tension is 30 to 40 kN/m.
Preferably, the concrete cushion layer of the bidirectional reinforcing bar is made of C25 strength grade concrete.
Preferably, the steel bars of the bidirectional reinforcing steel bar concrete cushion layer in the deep area of the pile foundation bearing platform are laid in a 1:6 slope releasing mode.
Preferably, the concrete cushion layer of the bidirectional reinforcing bar cuts off the internal reinforcing bars in the area of the large-depth opening, and the four sides of the opening are respectively provided with at least 2 reinforcing bars.
More preferably, the area with a larger falling depth is the area where the water collecting well and/or the elevator well are located.
More preferably, the diameter of each reinforcing steel bar is larger than the diameter of each reinforcing steel bar.
The invention also provides a construction method of the multi-elevation deep foundation pit anchoring and pulling supporting structure, which comprises the following steps:
step 2, excavating earthwork to a shallow elevation pit bottom;
step 3, cleaning the pile heads of the engineering piles and the supporting piles;
step 4, binding steel bars in the crown beam and the reinforcement cushion layer;
step 5, pouring concrete, and integrally pouring and connecting the concrete cushion layer with the bidirectional reinforcing bars and the crown beam;
and 6, excavating deep elevation foundation pit earthwork.
Preferably, in the step 2, if the engineering pile is a prestressed pipe pile, a core is poured to treat a pile head.
The invention has the beneficial effects that:
the application of the invention can improve the safety and stability of the multi-elevation deep foundation pit supporting structure, effectively control the deformation of the multi-elevation deep foundation pit supporting structure and reduce the disturbance of the foundation soil within a shallow elevation range.
The invention more effectively utilizes the anchoring capacity of the engineering pile in the shallow elevation range, shortens the construction period and has obvious economic benefit.
The invention further saves the arrangement of the anchor cables and the inner supports, is matched with open-cut and smooth construction method for construction, and has better applicability.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a sectional view showing a reinforced mat bolting-pulling support structure according to an embodiment of the present invention.
Fig. 2 shows a plan view of a reinforced mat bolting-pull supporting structure according to an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating processing of a reinforcement mat meeting hole according to an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 to 3, many elevation deep basal pit anchor draws supporting construction, its characterized in that: the anchor rod comprises an anchor ingot structure, a force transmission structure and a supporting and retaining structure;
the force transmission structure is a bidirectional reinforced concrete cushion; the retaining structure is a reinforced concrete crown beam and a supporting structure; the anchor ingot structure is a plurality of fender posts outside the soil body damage surface;
the anchoring and pulling horizontal force of a single fender pile is determined according to the allowable horizontal displacement of the pile top and the pile diameter;
the guard piles form a plurality of groups of engineering piles by taking one column and four piles as a group;
a plurality of steel bars in the concrete cushion layer of the bidirectional reinforcing bar are arranged in a single-layer bidirectional mode, a plurality of steel bars orthogonal to the length direction of the crown beam are arranged according to the reinforcing bar ratio of 0.2%, and a plurality of steel bars parallel to the length direction of the crown beam are distributed in a phi 8@250 mode;
the anchoring length of each reinforcing steel bar entering the crown beam, which is orthogonal to the length direction of the crown beam, is more than 40 times of the diameter of the corresponding reinforcing steel bar;
and the space interval between every two adjacent steel bars orthogonal to the length direction of the crown beam is not more than 150 mm.
The working principle of the invention is as follows:
the engineering pile in the shallow elevation range positioned in the soil body damage surface can not be used as the anchor structure of the invention, and the engineering pile outside the damage surface can be used as the anchor structure;
a plurality of fender pile uses four piles of a post as a set of formation engineering stake, can for many elevation deep basal pit supporting construction top contributions effectual anchor draw rigidity, makes supporting construction become single fulcrum plate-type supporting system to supporting construction's stability and security have been improved.
With a plurality of reinforcing bars that crown beam length direction is parallel adopt phi 8@ 250's distribution mode, and a plurality of reinforcing bars that are orthorhombic with crown beam length direction adopt more than 40 times corresponding reinforcing bar diameter's anchor length to and the interval between the adjacent reinforcing bar below 150 millimeters, can guarantee the economic nature and the rationality of arrangement of reinforcement bed course.
In some embodiments, the pile top of the engineering pile allows a horizontal displacement of 10 mm; the pile diameter of the engineering pile is 0.5 m; the anchoring horizontal force of a single engineering pile is 70 kilonewtons; the column pitch of each group of the engineering piles comprising one column and four piles is 8 meters, and the provided anchor tension is 30 to 40 kN/m.
In some embodiments, the concrete pad of the bidirectional reinforcing bar is made of C25 strength grade concrete.
In some embodiments, the steel bars of the bidirectional reinforcing steel bar concrete cushion layer in the deep area of the pile foundation bearing platform are laid in a 1:6 slope-releasing mode.
In practical application, the structure can ensure the further effective transmission of the internal force of the reinforcing steel cushion layer of the concrete cushion layer of the bidirectional reinforcing steel.
In some embodiments, the concrete cushion layer of the bidirectional reinforcing bar breaks off the internal reinforcing bars in the area of the hole with larger depth, and a minimum of 2 reinforcing bars are arranged on each of the four sides of the hole.
In practical application, the structure can ensure the further effective transmission of the internal force of the reinforcing steel cushion layer of the concrete cushion layer of the bidirectional reinforcing steel.
In some embodiments, the area of the opening with a larger drop depth is the area of the collector well and/or the elevator well.
In some embodiments, the diameter of each of the reinforcing bars is greater than the diameter between each of the reinforcing bars.
The invention also provides a construction method of the multi-elevation deep foundation pit anchoring and pulling supporting structure, which comprises the following steps:
step 2, excavating earthwork to a shallow elevation pit bottom;
step 3, cleaning the pile heads of the engineering piles and the supporting piles;
step 4, binding steel bars in the crown beam and the reinforcement cushion layer;
step 5, pouring concrete, and integrally pouring and connecting the concrete cushion layer with the bidirectional reinforcing bars and the crown beam;
and 6, excavating deep elevation foundation pit earthwork.
In the construction process, the shallow elevation engineering pile and the supporting structure are stressed together under the action of the tie of the reinforcing bar cushion layer.
In some embodiments, in step 2, if the engineering pile is a prestressed pipe pile, a core is poured to treat the pile head.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. Many elevation deep basal pit anchor draws supporting construction, its characterized in that: the anchor rod comprises an anchor ingot structure, a force transmission structure and a supporting and retaining structure;
the force transmission structure is a bidirectional reinforced concrete cushion; the retaining structure is a reinforced concrete crown beam and a supporting structure; the anchor ingot structure is a plurality of fender posts outside the soil body damage surface;
the anchoring and pulling horizontal force of a single fender pile is determined according to the allowable horizontal displacement of the pile top and the pile diameter;
the guard piles form a plurality of groups of engineering piles by taking one column and four piles as a group;
a plurality of steel bars in the concrete cushion layer of the bidirectional reinforcing bar are arranged in a single-layer bidirectional mode, a plurality of steel bars orthogonal to the length direction of the crown beam are arranged according to the reinforcing bar ratio of 0.2%, and a plurality of steel bars parallel to the length direction of the crown beam are distributed in a phi 8@250 mode;
the anchoring length of each reinforcing steel bar entering the crown beam, which is orthogonal to the length direction of the crown beam, is more than 40 times of the diameter of the corresponding reinforcing steel bar;
and the space interval between every two adjacent steel bars orthogonal to the length direction of the crown beam is not more than 150 mm.
2. The multi-elevation deep foundation pit bolting structure according to claim 1, wherein a pile top of said engineering pile allows a horizontal displacement of 10 mm; the pile diameter of the engineering pile is 0.5 m; the anchoring horizontal force of a single engineering pile is 70 kilonewtons; the column pitch of each group of the engineering piles comprising one column and four piles is 8 meters, and the provided anchor tension is 30 to 40 kN/m.
3. The multi-elevation deep foundation pit bolting configuration according to claim 1, wherein said concrete pad of said bidirectional reinforcing bar is C25 strength grade concrete.
4. The multi-elevation deep foundation pit bolting and supporting structure according to claim 1, wherein the concrete mats of the bidirectional reinforcing bars are laid on the steel bars in the deep falling area of the pile foundation cap in a 1:6 slope-releasing manner.
5. The multi-elevation deep foundation pit anchoring and supporting structure according to claim 1, wherein the concrete pad of the bidirectional reinforcing bars is disconnected from the internal reinforcing bars in the area of the opening with a large depth, and a minimum of 2 reinforcing bars are arranged on each of four sides of the opening.
6. The multi-elevation deep foundation pit bolting configuration according to claim 5, characterized in that said area of large drop depth opening is the area of a water collecting well and/or an elevator well.
7. The multi-elevation deep foundation pit bolting configuration according to claim 5, wherein each of said reinforcing steel bars has a diameter larger than that between each of said steel bars.
8. The construction method of the multi-elevation deep foundation pit bolting and supporting structure according to claim 1, comprising the steps of:
step 1, constructing engineering piles and supporting piles;
step 2, excavating earthwork to a shallow elevation pit bottom;
step 3, cleaning the pile heads of the engineering piles and the supporting piles;
step 4, binding steel bars in the crown beam and the reinforcement cushion layer;
step 5, pouring concrete, and integrally pouring and connecting the concrete cushion layer with the bidirectional reinforcing bars and the crown beam;
and 6, excavating deep elevation foundation pit earthwork.
9. The construction method of a multi-elevation deep foundation pit bolting-supporting structure according to claim 8, wherein in said step 2, if the engineering pile is a prestressed pipe pile, a core is poured to treat a pile head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110133579.9A CN112796333A (en) | 2021-02-01 | 2021-02-01 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110133579.9A CN112796333A (en) | 2021-02-01 | 2021-02-01 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
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| CN112796333A true CN112796333A (en) | 2021-05-14 |
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| CN202110133579.9A Pending CN112796333A (en) | 2021-02-01 | 2021-02-01 | Multi-elevation deep foundation pit anchoring and pulling supporting structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113652922A (en) * | 2021-09-02 | 2021-11-16 | 中铁一局集团厦门建设工程有限公司 | Profile steel cover plate pavement structure |
| CN114855811A (en) * | 2022-06-01 | 2022-08-05 | 上海市城市建设设计研究总院（集团）有限公司 | Three-row pile-combination supporting structure and corresponding foundation pit construction method |
-
2021
- 2021-02-01 CN CN202110133579.9A patent/CN112796333A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113652922A (en) * | 2021-09-02 | 2021-11-16 | 中铁一局集团厦门建设工程有限公司 | Profile steel cover plate pavement structure |
| CN114855811A (en) * | 2022-06-01 | 2022-08-05 | 上海市城市建设设计研究总院（集团）有限公司 | Three-row pile-combination supporting structure and corresponding foundation pit construction method |
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