CN116950087A - Non-support combined deep foundation pit supporting structure - Google Patents
Non-support combined deep foundation pit supporting structure Download PDFInfo
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- CN116950087A CN116950087A CN202310978824.5A CN202310978824A CN116950087A CN 116950087 A CN116950087 A CN 116950087A CN 202310978824 A CN202310978824 A CN 202310978824A CN 116950087 A CN116950087 A CN 116950087A
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- Prior art keywords
- foundation pit
- supporting structure
- construction
- pile
- anchor
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- 239000002689 soil Substances 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 28
- 238000009412 basement excavation Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The invention belongs to the technical field of building construction, in particular to a support structure of a support-free combined deep foundation pit, which aims at the technical problems that the application range and the excavation depth of the existing filling pile for single use are limited, and the site has no slope-releasing condition, and provides the following scheme, wherein the support structure comprises a soil layer, a waterproof curtain and a support structure, and the foundation pit is arranged at the top of the soil layer; the invention has the advantages of good structural integrity, good seepage-proofing effect, high efficiency in pile forming process, and the functions of enclosing structure and seepage-proofing effect in complex surrounding environment, more pipelines and nearby built multi-layer basements of buildings, solves the problems of stress and limited surrounding environment of the supporting structure compared with other enclosing structure forms meeting the same engineering requirements, does not need structural measures such as inner support construction, and the like, and simultaneously the cover plate of the construction has the double functions of site hardening at the top of the foundation pit, reduces the cost of the supporting structure, improves the construction efficiency of the foundation pit excavation and the main structure, and has obvious comprehensive economic benefit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a support-free combined deep foundation pit supporting structure.
Background
The conventional support mode of the deep foundation pit bored concrete pile and the anchor cable is capable of enabling the construction progress of the main structure to be faster after the deep foundation pit is excavated to the bottom, avoiding the influence of the support to the construction period, but the anchor cable can extend to a larger range beyond the support structure, and because the surrounding environment of the deep foundation pit is complex, the multi-layer basement of a built building and the surrounding buried pipelines are close to each other, the requirement on deformation control is higher, the bored concrete pile is used alone, the application range and the excavation depth are limited, and no slope releasing condition exists in the field.
Disclosure of Invention
The invention provides a support-free combined deep foundation pit supporting structure, which solves the problems that the application range and the excavation depth of a single-use filling pile proposed in the background technology are limited, and the site is free from sloping conditions.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the support structure of the non-support combined deep foundation pit comprises a soil layer, a waterproof curtain and a support structure, wherein the foundation pit is arranged at the top of the soil layer, and the waterproof curtain is fixedly connected with the inner wall of the soil layer;
the waterproof curtain comprises supporting structures which are equidistantly distributed along the circumference direction of the foundation pit, each supporting structure comprises two groups of filling piles, and the two groups of filling piles in the same group of supporting structures are respectively positioned at the inner side and the outer side of the foundation pit
The supporting structure consists of anchor cables, a cover plate and a capping beam, the tops of two groups of filling piles in the same group of supporting structures are fixedly connected through the capping beam, holes are formed in the cover plate fixedly at the tops of the capping beams, and the anchor cables are fixedly connected with the holes in the cover plate through anchors.
Preferably, the included angle between the anchor cable and the cast-in-situ pile is 25-30 DEG
Preferably, the steps are as follows:
s1: drilling holes through the triaxial stirring piles, and then spraying cement into the soil layer and fully stirring;
s2: timely constructing the filling pile to form a vertical supporting structure after the triaxial stirring pile is constructed, so that the filling pile and surrounding soil layers form a waterproof curtain;
s3: the free ends of the tops of the filling piles and the filling piles spaced outside the foundation pit are connected through the top capping beams to form a double-wall integral structure, and the top of the top capping beams is fixedly provided with a cover plate;
s4: the cover plate is reserved with a hole for the construction of a prestressed anchor rope, after the strength of the top beam and the concrete cover plate meet the design requirement, the prestressed anchor rope is connected to the reserved construction hole of the prestressed anchor rope on the cover plate through an anchorage device, and the prestressed anchor rope and the cast-in-place pile are constructed at a certain angle, wherein the angle is generally 25-30 DEG
S5: the anchor cable construction holes are reserved for construction and grouting, the strength and rigidity of the supporting structure are greatly improved, the anchor cable and the cast-in-place pile form effective constraint, acting force of soil after deep foundation pit excavation is resisted, and then the anchor cable is excavated in layers and hung in a net in time until the foundation pit is excavated to a foundation pit substrate.
According to the invention, after the triaxial stirring pile is constructed, the filling pile is constructed in time to form a vertical supporting structure, so that the filling pile and surrounding soil body form a waterproof curtain to block water and enhance soil body stability, the filling pile is connected with the free ends of the tops of the filling piles at intervals outside the foundation pit to form a double-wall integral structure, the time of supporting and changing the support is reduced, the occupied area is small, and the structural stability is good; meanwhile, the pre-stressed anchor cable is constructed and grouting is carried out through reserving the pre-stressed anchor cable construction hole, the strength and the rigidity of the supporting structure are greatly improved, the pre-stressed anchor cable and the cast-in-place pile form effective constraint, and acting force of soil after deep foundation pit excavation is resisted; the structure has the advantages of good integrity, good seepage-proofing effect, high efficiency in the piling process, complex surrounding environment, more pipelines and the like, and has the functions of enclosing structure and seepage-proofing effect, compared with other enclosing structure forms reaching the same engineering requirement, the structure solves the problems of stress and limited surrounding environment of the supporting structure, no structural measures such as inner support are needed to be constructed, and meanwhile, the constructed cover plate plays the double role of site hardening at the top of the foundation pit, the cost of the supporting structure is reduced, the construction work efficiency of the foundation pit excavation and the main structure is improved, and the comprehensive economic benefit is obvious.
Drawings
Fig. 1 is a schematic structural diagram of a support structure of a combined deep foundation pit without support according to the present invention.
FIG. 2 is a schematic plan view of a support structure for a deep foundation pit without support
Reference numerals in the drawings: 100. a soil layer; 101. a foundation pit; 200. a waterproof curtain; 201. filling piles; 202. a cover plate; 300. a support structure; 301. an anchor cable; 302. and (5) pressing the top beam.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-2, a support-free combined deep foundation pit supporting structure comprises a soil layer 100, a waterproof curtain 200 and a supporting structure 300, wherein a foundation pit 101 is arranged at the top of the soil layer 100, and the waterproof curtain 200 is fixedly connected with the inner wall of the soil layer 100;
the waterproof curtain 200 comprises supporting structures which are equidistantly distributed along the circumferential direction of the foundation pit 101, each supporting structure comprises two groups of filling piles 201, and the two groups of filling piles 201 in the same supporting structure are respectively positioned at the inner side and the outer side of the foundation pit 101;
the supporting structure 300 consists of anchor cables 301, a cover plate 202 and a top beam 302, wherein the tops of two groups of cast-in-place piles 201 in the same group of supporting structures are fixedly connected through the top beam 302, the top of the top beam 302 is fixedly provided with a hole on the cover plate 202, and the anchor cables 301 are fixedly connected with the hole on the cover plate 202 through an anchor;
in this embodiment: the included angle between the anchor cable 301 and the cast-in-place pile 201 is 25-30 degrees;
in this embodiment: the method comprises the following steps:
s1: drilling holes through the triaxial stirring piles, and then spraying cement into the soil layer 100 and fully stirring; the stability of soil is enhanced;
s2: timely constructing the filling pile 201 to form a vertical supporting structure after the triaxial mixing pile is constructed, so that the filling pile 201 and the surrounding soil layer 100 form a waterproof curtain 200; the stability of soil is enhanced;
s3: the filling pile 201 and the free end of the top of the filling pile 201 spaced outside the foundation pit 101 are connected through a capping beam 302 to form a double-wall integral structure, and a cover plate 202 is fixed on the top of the capping beam 302; the time for dismounting and replacing the support is reduced, the occupied area is small, and the structural stability is good;
s4: the cover plate 202 is reserved with holes for construction of the pre-stressed anchor cables 301, after the strength of the capping beam 302 and the concrete cover plate 202 meet the design requirement, the pre-stressed anchor cables 301 are connected to the pre-stressed anchor cable 301 reserved construction holes on the cover plate 202 through anchors, and the pre-stressed anchor cables 301 and the cast-in-place pile 201 are constructed according to a certain angle, wherein the angle is generally 25-30 degrees; the anchor cable 301 and the cast-in-place pile 201 form effective constraint to resist the acting force of the soil body after the deep foundation pit is excavated.
S5: the anchor cable 301 is constructed by reserving the construction holes of the anchor cable 301 and grouting is carried out, the anchor cable 301 greatly improves the strength and rigidity of the supporting structure, the anchor cable 301 and the cast-in-place pile 201 form effective constraint, acting force of soil after deep foundation pit excavation is resisted, then the foundation pit is excavated in a layered mode, and net hanging and anchor spraying are carried out in time until the foundation pit 101 is excavated.
Working principle: cement is injected into a soil layer 100 through triaxial stirring pile drilling, and is fully stirred, after triaxial stirring pile construction is completed, a filling pile 201 is timely constructed to form a vertical supporting structure, the filling pile 201 and surrounding soil body form a waterproof curtain 200 to block water and enhance soil stability, the filling pile 201 and the free end at the top of the filling pile 201 at intervals outside a foundation pit 101 are connected to form a double-wall integral structure, support-dismantling and support-changing time is shortened, occupied area is small, structural stability is good, the filling pile is connected through a reinforced concrete crown beam (a capping beam 302) and a cover plate 202, holes for constructing a pre-stressed anchor cable 301 are reserved on the cover plate 202, after the strength of the crown beam (the capping beam 302) and the concrete cover plate 202 meet design requirements, the pre-stressed anchor cable 301 is connected to the pre-stressed anchor cable 301 reserved at a construction hole of the cover plate 202 through an anchor, the pre-stressed anchor cable 301 and the filling pile 202 are constructed at a certain angle, the pre-stressed anchor cable 301 is constructed at an angle of 25-30 DEG, the pre-stressed anchor cable 301 is reserved at the construction hole is constructed and is grouted, the pre-stressed anchor cable 301 is greatly improved in the strength and rigidity of the supporting structure, the pre-stressed anchor cable 301 is effectively restrained by the construction hole, the pre-stressed anchor cable 201 is formed and the pre-stressed anchor cable is excavated until the soil body is excavated to a deep foundation pit is hung in time; the problem of supporting construction atress and the limited problem of surrounding environment are solved, structural measures such as inner support need not be under construction again to the apron of construction plays the site hardening dual function at the foundation ditch top simultaneously, reduces supporting construction cost, improves foundation ditch excavation and major structure construction work efficiency, and comprehensive economic benefits is very obvious.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The utility model provides a no support combination formula deep basal pit supporting construction, includes soil layer (100), waterproof curtain (200) and supporting construction (300), its characterized in that, foundation ditch (101) are seted up at the top of soil layer (100), waterproof curtain (200) are fixed connection with the inner wall of soil layer (100);
the waterproof curtain (200) comprises supporting structures which are distributed at equal intervals along the circumference direction of the foundation pit (101), each supporting structure comprises two groups of filling piles (201), and the two groups of filling piles (201) in the same supporting structure are respectively located at the inner side and the outer side of the foundation pit (101).
The supporting structure (300) is composed of anchor cables (301), cover plates (202) and top beams (302), the tops of two groups of filling piles (201) in the same group of supporting structures are fixedly connected through the top beams (302), the cover plates (202) are fixedly arranged at the tops of the top beams (302), holes are formed in the cover plates (202), and the anchor cables (301) are fixedly connected with the holes in the cover plates (202) through anchors.
2. A combined deep foundation pit supporting structure without support according to claim 1, characterized in that the angle between the anchor lines (301) and the cast-in-place piles (201) is in the range of 25 ° -30 °.
3. The construction method of the support-free combined type deep foundation pit supporting structure according to claim 1, which is characterized by comprising the following steps:
s1: drilling holes through the triaxial stirring piles, and then spraying cement into the soil layer (100) and fully stirring;
s2: timely constructing the filling pile (201) to form a vertical supporting structure after the triaxial stirring pile is constructed, so that the filling pile (201) and surrounding soil layers (100) form a waterproof curtain (200);
s3: the filling pile (201) is connected with the free end of the top of the filling pile (201) spaced outside the foundation pit (101) through a capping beam (302) to form a double-wall integral structure, and a cover plate (202) is fixed on the top of the capping beam (302);
s4: the cover plate (202) is reserved with a hole for constructing a pre-stress anchor rope (301), after the strength of the top beam (302) and the concrete cover plate (202) reach the design requirement, the pre-stress anchor rope (301) is connected with the pre-stress anchor rope (301) on the cover plate (202) through an anchorage device at the position of the pre-stress anchor rope (301) reserved construction hole, and the pre-stress anchor rope (301) and the cast-in-place pile (201) are constructed according to a certain angle, wherein the angle is generally 25-30 DEG
S5: the anchor cable (301) is constructed through reserving the construction holes of the anchor cable (301) and grouting is carried out, the strength and the rigidity of the supporting structure are greatly improved by the anchor cable (301), the anchor cable (301) and the cast-in-place pile (201) form effective constraint, acting force of soil after deep foundation pit excavation is resisted, and then the anchor cable is excavated in a layered mode and hung on a net in time until the foundation pit (101) is excavated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310978824.5A CN116950087A (en) | 2023-08-04 | 2023-08-04 | Non-support combined deep foundation pit supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310978824.5A CN116950087A (en) | 2023-08-04 | 2023-08-04 | Non-support combined deep foundation pit supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116950087A true CN116950087A (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310978824.5A Pending CN116950087A (en) | 2023-08-04 | 2023-08-04 | Non-support combined deep foundation pit supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116950087A (en) |
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2023
- 2023-08-04 CN CN202310978824.5A patent/CN116950087A/en active Pending
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