CN112095617A - Deep pit supporting structure in foundation pit and construction method thereof - Google Patents
Deep pit supporting structure in foundation pit and construction method thereof Download PDFInfo
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- CN112095617A CN112095617A CN202010846290.7A CN202010846290A CN112095617A CN 112095617 A CN112095617 A CN 112095617A CN 202010846290 A CN202010846290 A CN 202010846290A CN 112095617 A CN112095617 A CN 112095617A
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a deep pit supporting structure in a foundation pit and a construction method thereof, wherein the method comprises the following steps: on the basis of construction completion of engineering piles for supporting a foundation pit bottom plate, a pit area is excavated, engineering piles within the pit area are broken, and an uphill line and other engineering piles of the pit area are reserved; and adopting a tie bar for tie between the uphill line of the reserved deep pit area and the two rows of engineering piles which are arranged outside relatively, pouring concrete to form a reinforced cushion layer, and tying the uphill line and the tops of the two rows of engineering piles which are arranged outside relatively into a whole. According to the method, the tops of two rows of engineering piles at the ascending line and the opposite outward-arranged positions of the ascending line in the pit area are tied through the reinforcing bar cushion layers to form the supporting structure, the pit concrete enclosing purlin and the steel supports are not needed, the pit is dug more quickly, the pit can be poured and the bottom plate can be poured as soon as possible, the safety of the pit is greatly facilitated, the construction period can be well saved, and the performance of a boosting project can be better completed.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a deep pit supporting structure in a foundation pit and a construction method thereof.
Background
Along with the rapid development of national economy, the process of urbanization in China is also accelerating. The land is a necessary component of urban construction, has become a main factor influencing urbanization, and in order to save construction cost and improve land utilization rate, buildings in urban areas are increasingly high-rise and dense, and then foundation pit engineering shows the characteristics of large, deep, tight and close and the like. A foundation pit enclosure structure is an organism of mutual combined action of a soil body and the enclosure structure, and not only can the stability of a foundation pit and the safety and convenience of operation in the pit be ensured, but also the displacement of the soil body at the bottom of the pit and outside the pit is controlled within a certain range, and the normal use of adjacent buildings and municipal facilities is ensured.
The existing commonly used foundation pit support structure mainly adopts a row of piles and inner support method, namely, a row of reinforced concrete piles are arranged on the periphery of a foundation pit, then soil is excavated step by step, steel supports are applied at the designed depth to limit the horizontal displacement of the soil around the pit, and a concrete purlin is arranged on the pile top of each reinforced concrete pile to be reinforced by pulling.
However, this method is not suitable for the case of deep pit in the foundation pit, and if there is a foundation pit project of basement elevator shaft deep pit, if too many horizontal inner supports are arranged in the foundation pit, the construction of the deep pit will be seriously affected, so how to solve the problem of foundation pit enclosure of the foundation pit project of basement elevator shaft deep pit becomes a hot point of research.
In view of this, in order to reduce the deformation of the foundation pit, improve the anti-overturning capability of the foundation pit and enhance the water-stopping and seepage-proofing capability of the foundation pit, the invention of the elevator shaft deep pit supporting structure in the foundation pit and the construction method thereof which have reliable construction quality, good enclosure effect and high construction speed is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a pit supporting structure in a foundation pit and a construction method thereof, which can replace a pit concrete enclosing purlin and a steel support and are more beneficial to pit excavation so as to quickly finish pit construction and bottom plate construction.
In order to achieve the technical effects, the invention provides a construction method of a pit supporting structure in a foundation pit, which comprises the following steps:
on the basis of construction completion of engineering piles for supporting a foundation pit bottom plate, a pit area is excavated, engineering piles within the pit area are broken, and an uphill line and other engineering piles of the pit area are reserved;
and adopting a tie bar for tie between the uphill line of the reserved deep pit area and the two rows of engineering piles which are arranged outside relatively, pouring concrete to form a reinforced cushion layer, and tying the uphill line and the tops of the two rows of engineering piles which are arranged outside relatively into a whole.
As an implementation mode of the construction method of the pit supporting structure in the foundation pit, when the engineering pile in the pit area is broken, the internal corner and the external corner are manually broken.
As an embodiment of the construction method of the deep pit supporting structure in the foundation pit, the width of the reinforcement cushion layer is not less than 6 meters, and two rows of the engineering piles with the same interval are selected within the width range of the reinforcement cushion layer.
As an implementation mode of the construction method of the pit supporting structure in the foundation pit, the reinforcement cushion layers are adopted to tie the upper broken lines on the two opposite sides of the pit area and the engineering piles which are arranged outwards oppositely.
As an embodiment of the construction method of the support structure of the deep pit in the foundation pit of the present invention, after the tie construction of the reinforcement mat is completed, an elevator shaft and/or a water collecting shaft is/are provided in the deep pit area.
The second aspect of the present invention provides an in-pit deep pit supporting structure, including: and reserving a plurality of rows of engineering piles for supporting a foundation pit bottom plate outside an uphill line of a deep pit area, wherein the uphill line and the tops of two rows of the engineering piles which are oppositely arranged outwards are fixed by adopting a reinforcement cushion layer in a pulling mode, and the reinforcement cushion layer comprises a pulling rib which is pulled between the two rows of the engineering piles and concrete which is poured on the pulling rib.
As an implementation mode of the deep pit supporting structure in the foundation pit, the engineering pile at the uphill line is a cast-in-situ bored pile.
As an embodiment of the supporting structure of the pit in the foundation pit, the bottom and the edge of the pit area are provided with soil body reinforcements.
As the embodiment of the deep pit supporting structure in the foundation pit of the invention: the tie bar comprises four longitudinal steel bars arranged on two sides of each row of the engineering pile and two transverse steel bars connected to two ends of the four longitudinal steel bars.
As an embodiment of the supporting structure of the pit in the foundation pit, a pre-anchoring section for anchoring into a foundation pit bottom plate is reserved at the end parts of the longitudinal steel bars and the transverse steel bars.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
on the basis of reinforcing the soil body of the pit area, the tops of two rows of engineering piles at the ascending line and the opposite outward-discharging positions of the pit area are tied through the reinforcing bar cushion layers to form a supporting structure, compared with the supporting structure of the concrete enclosing purlin and the steel supports, the supporting structure can be used without the concrete enclosing purlin and the steel supports, the pit is dug more quickly, the pit can be poured and the bottom plate can be poured as soon as possible, the safety of the pit is greatly facilitated, the construction period can be well saved, and the performance of a boosting project can be well completed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic plan view of a conventional supporting structure for a foundation pit concrete purlin and a steel support.
Fig. 2 is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a schematic plan view of a pit supporting structure in a foundation pit according to an embodiment of the present invention.
Fig. 4 is a sectional view taken along line B-B of fig. 3.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
First, referring to fig. 1 and 2, fig. 1 is a schematic plan view of a conventional supporting structure for a foundation pit concrete purlin and a steel support, and fig. 2 is a sectional view taken along line a-a of fig. 1. The existing commonly used foundation pit support structure mainly adopts a row of piles and an inner support method, namely, a row of reinforced concrete piles 21 are arranged at the periphery of a foundation pit, then soil is excavated step by step, steel supports 22 are applied at the designed depth to limit the horizontal displacement of the soil around the pit, and a concrete purlin 23 is arranged at the pile top of the reinforced concrete piles 21 for tie reinforcement.
However, this method is not suitable for the case of deep pit in the foundation pit, and if there is a foundation pit project of basement elevator shaft deep pit, if too many horizontal inner supports are arranged in the foundation pit, the construction of the deep pit will be seriously affected, so how to solve the problem of foundation pit enclosure of the foundation pit project of basement elevator shaft deep pit becomes a hot point of research.
The invention provides a pit supporting structure in a foundation pit and a construction method thereof, which can replace a pit concrete purlin and a steel support and are more beneficial to pit excavation so as to quickly finish pit construction and bottom plate construction.
The technical solution of the present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 3 and 4, fig. 3 is a schematic plan view of a pit supporting structure in a foundation pit according to an embodiment of the present invention, and fig. 4 is a sectional view taken along line B-B of fig. 3. The embodiment of the invention provides a deep pit supporting structure in a foundation pit, which mainly comprises: multiple rows of engineering piles for supporting a foundation pit bottom plate are reserved outside an ascending line of a pit area 10, wherein two rows of the engineering piles which are arranged at the ascending line of the pit area and are oppositely arranged outside the ascending line are selected to manufacture a supporting structure of the pit area, specifically, a reinforcement cushion layer 11 is adopted to tie and fix the tops of the two rows of the engineering piles into a whole, wherein the reinforcement cushion layer 11 comprises tie bars which are tied between the two rows of the engineering piles and concrete which is poured on the tie bars. The row of construction piles located in the upper broken line of the pit area is referred to as a fender pile 12 according to the construction convention, and cast-in-situ bored piles may be used. The outer row of engineering piles opposite to the fender pile 12 and the remaining engineering piles are still referred to as engineering piles 13, and the engineering piles 13 may be cast-in-situ piles or other types of piles, but the invention is not limited thereto.
Preferably, the retaining piles 12 at the upper broken lines on the two opposite sides of the pit area 10 and the engineering piles 13 which are relatively arranged outside are respectively tied by using the reinforcement cushion layers 22, and the reinforcement cushion layers can be arranged between the retaining piles 12 and the engineering piles 13 around the pit area 10 for tying according to different soil conditions, so as to meet the pit supporting requirements. Further, the tie bars of the reinforcement cushion 11 on each side include four longitudinal bars 111 disposed on both sides of each row of fender piles 12 and engineering piles 13 and two transverse bars 112 connected to both ends of the four longitudinal bars 111, and the two transverse bars 112 are located outside the ends of the fender piles 12 and the engineering piles 13, so as to completely enclose the fender piles 12 and the engineering piles 13 therein. The end parts of the longitudinal steel bars 111 and the transverse steel bars 112 are reserved with pre-anchoring sections for anchoring into the foundation pit bottom plate, and the reserved length is based on meeting the design requirement. The longitudinal steel bars 111 and the transverse steel bars 112 are preferably C12@150mm steel bars, and the concrete of the reinforced cushion layer 11 is preferably C15 concrete with the thickness of 300 mm. The width of the reinforcing mat layer 11 is not less than 6m, and guard piles 12 and engineering piles 13 with the same distance are selected within the width range of the reinforcing mat layer 11. The common method is as follows: and taking an ascending slope line of the deep pit area as a reference, and externally placing 6m to be used as a construction range of the reinforcement cushion layer.
The bottom and the edge of the pit area 10 are provided with soil body reinforcement, an engineering pile for supporting a foundation pit bottom plate can be directly adopted, and the pile head of the engineering pile is broken to be flush with the bottom and the edge of the pit area respectively, so that the construction of the pit area is not influenced.
The construction method of the deep pit supporting structure in the foundation pit of the invention is further explained in detail by taking the foundation pit engineering with the deep pit of the elevator shaft of the basement as an example, and mainly comprises the following steps:
the method comprises the following steps: on the basis of the construction completion of the engineering piles for supporting the foundation pit bottom plate, a pit area 10 is excavated, the engineering piles in the pit area 10 are broken, and an uphill line of the pit area 10 and other engineering piles are reserved;
step two: and adopting a tie bar for tie between the uphill line of the reserved deep pit area 10 and the two rows of engineering piles which are relatively arranged outwards, pouring concrete to form a reinforced cushion layer 11, and tying the uphill line and the tops of the two rows of engineering piles which are relatively arranged outwards into a whole.
The engineering piles located on the uphill line of the pit area 10 are used as fender piles 12 in the pit area, and the outer row of engineering piles opposite to the engineering piles are still used as engineering piles 13, so that the following description is facilitated. Wherein, the fender pile 12 can adopt a cast-in-situ bored pile.
Further, in the first step, the engineering piles in the deep pit area 10 are broken according to the design gradient of the deep pit, and the internal and external corner parts of the deep pit are manually broken.
In the second step, taking an uphill line of the deep pit area as a reference, and externally placing 6m to be used as a construction range of the reinforcement cushion layer 10; namely, the width of the reinforcing bar cushion layer is 6 meters, and the fender piles and the engineering piles with the same distance are selected within the width range of the reinforcing bar cushion layer to be used as a pit supporting structure, namely, the distance between the fender piles and the engineering piles is about 6 meters.
As shown in fig. 1 and 2, the retaining piles 12 of the upper broken line on two opposite sides of the pit area 10 and the engineering piles 13 arranged outside oppositely are respectively tied and fixed by using a reinforcing bar cushion layer 10. According to different soil conditions, reinforcing bar cushion layers are arranged between the surrounding piles 12 and the engineering piles 13 around the deep pit area 10 for tie-tying if necessary so as to meet the deep pit supporting requirement.
Further, after the tie construction of the reinforcing mat 10 is completed, the elevator shaft and/or the sump shaft 14 is provided in the pit area 10, and the pit construction is completed.
The invention relates to a supporting structure of a deep pit in a foundation pit and a construction method thereof, wherein on the basis of reinforcing a soil body of the deep pit area, tops of two rows of engineering piles at an uphill line and a relative outward discharge position of the deep pit area are tied through a reinforcement cushion layer to form a supporting structure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention, and are all included in the scope of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. A construction method of a deep pit supporting structure in a foundation pit is characterized by comprising the following steps:
on the basis of construction completion of engineering piles for supporting a foundation pit bottom plate, a pit area is excavated, engineering piles within the pit area are broken, and an uphill line and other engineering piles of the pit area are reserved;
and adopting a tie bar for tie between the uphill line of the reserved deep pit area and the two rows of engineering piles which are arranged outside relatively, pouring concrete to form a reinforced cushion layer, and tying the uphill line and the tops of the two rows of engineering piles which are arranged outside relatively into a whole.
2. The construction method of the in-pit deep-pit supporting structure according to claim 1, characterized in that: when the engineering pile in the deep pit area is broken, the internal and external corner parts are manually broken.
3. The construction method of the in-pit deep-pit supporting structure according to claim 1, characterized in that: the width of the reinforcing bar cushion layer is not less than 6m, and two rows of the engineering piles with the same interval are selected within the width range of the reinforcing bar cushion layer.
4. The construction method of the in-pit deep-pit supporting structure according to claim 1, characterized in that: and respectively adopting the reinforcement cushion layers to tie the upper broken lines on the two opposite sides of the pit area and the engineering piles which are oppositely arranged outwards.
5. The construction method of the in-pit deep-pit supporting structure according to claim 1, characterized in that: and after the tie construction of the reinforcement cushion layer is finished, arranging an elevator shaft and/or a water collecting well in the deep pit area.
6. The utility model provides a deep hole supporting construction in foundation ditch which characterized in that: and reserving a plurality of rows of engineering piles for supporting a foundation pit bottom plate outside an uphill line of a deep pit area, wherein the uphill line and the tops of two rows of the engineering piles which are oppositely arranged outwards are fixed by adopting a reinforcement cushion layer in a pulling mode, and the reinforcement cushion layer comprises a pulling rib which is pulled between the two rows of the engineering piles and concrete which is poured on the pulling rib.
7. The in-pit supporting structure of claim 6, wherein: and the engineering pile at the uphill line adopts a cast-in-place bored pile.
8. The in-pit supporting structure of claim 6, wherein: and soil body reinforcement is arranged at the pit bottom and the pit edge of the pit area.
9. The in-pit supporting structure of claim 6, wherein: the tie bar comprises four longitudinal steel bars arranged on two sides of each row of the engineering pile and two transverse steel bars connected to two ends of the four longitudinal steel bars.
10. The in-pit supporting structure of claim 9, wherein: and a pre-anchoring section for anchoring into a foundation pit bottom plate is reserved at the end parts of the longitudinal steel bars and the transverse steel bars.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010846290.7A CN112095617A (en) | 2020-08-21 | 2020-08-21 | Deep pit supporting structure in foundation pit and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010846290.7A CN112095617A (en) | 2020-08-21 | 2020-08-21 | Deep pit supporting structure in foundation pit and construction method thereof |
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| CN112095617A true CN112095617A (en) | 2020-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142433A (en) * | 2022-07-08 | 2022-10-04 | 中国建筑第八工程局有限公司 | Foundation pit supporting structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001159140A (en) * | 1999-12-03 | 2001-06-12 | Sumitomo Metal Ind Ltd | Landslide-countermeasure structure |
| CN205062820U (en) * | 2015-09-18 | 2016-03-02 | 南京市测绘勘察研究院有限公司 | Double row pile supporting construction of stagnant water stake interpolation precast pile combination bored concrete pile |
| CN108442385A (en) * | 2018-05-11 | 2018-08-24 | 南华大学 | A kind of supporting construction of foundation pit composite pile wall |
| CN211257010U (en) * | 2019-12-03 | 2020-08-14 | 山东正元建设工程有限责任公司 | Recoverable connection structure of double steel-pipe pile and steel truss crown beam |
-
2020
- 2020-08-21 CN CN202010846290.7A patent/CN112095617A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001159140A (en) * | 1999-12-03 | 2001-06-12 | Sumitomo Metal Ind Ltd | Landslide-countermeasure structure |
| CN205062820U (en) * | 2015-09-18 | 2016-03-02 | 南京市测绘勘察研究院有限公司 | Double row pile supporting construction of stagnant water stake interpolation precast pile combination bored concrete pile |
| CN108442385A (en) * | 2018-05-11 | 2018-08-24 | 南华大学 | A kind of supporting construction of foundation pit composite pile wall |
| CN211257010U (en) * | 2019-12-03 | 2020-08-14 | 山东正元建设工程有限责任公司 | Recoverable connection structure of double steel-pipe pile and steel truss crown beam |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142433A (en) * | 2022-07-08 | 2022-10-04 | 中国建筑第八工程局有限公司 | Foundation pit supporting structure and construction method thereof |
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Application publication date: 20201218 |