CN113006086A - Combination formula underground structure based on frame pile and miniature composite pile - Google Patents
Combination formula underground structure based on frame pile and miniature composite pile Download PDFInfo
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- CN113006086A CN113006086A CN202110271581.2A CN202110271581A CN113006086A CN 113006086 A CN113006086 A CN 113006086A CN 202110271581 A CN202110271581 A CN 202110271581A CN 113006086 A CN113006086 A CN 113006086A
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- piles
- pile
- foundation pit
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- rock
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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
Abstract
The invention discloses a combined foundation pit supporting structure based on frame piles and miniature composite piles, which is applied to a rock deep foundation pit or a soil-rock binary foundation pit with the thickness of no more than 6m of earth cover. The invention has the advantages that: through the bidirectional integral framework structure of the foundation pit, the stability requirements of fracture lines, arcs, plane sliding damage and the like of rock masses in the shape of incidence such as downdip along structural planes such as bedding planes, joint planes and the like are met; when the miniature composite pile is constructed, the local rock sliding body and the fixed body are cohered to form a diffusion-shaped complex, so that the anti-sliding performance of the rock-soil body at the sliding surface is improved, meanwhile, the miniature composite pile and the peripheral loose rock-soil form a firmer anti-sliding whole together, and the lateral resistance of the rock slope is improved.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a combined foundation pit supporting structure based on a frame pile and a miniature composite pile.
Background
The rock foundation pit has the problems of complexity of instability mechanism, diversity of failure modes, difficulty in selecting a supporting structure and incomplete construction process, and is a great problem to be solved urgently.
The design is carried out aiming at the characteristics, deformation characteristics and failure modes of the rock deep foundation pit, and a foundation pit supporting structure is urgently needed by technical personnel in the field, so that the safety of the foundation pit can be ensured, the construction cost is reduced, the construction difficulty is reduced, and the construction period is shortened.
Disclosure of Invention
The invention aims to provide a combined foundation pit supporting structure based on frame piles and micro composite piles according to the defects of the prior art, and the combined foundation pit supporting structure ensures the stability and the overall safety of a foundation pit by adopting the frame piles and the micro composite piles to form an integral foundation pit supporting structure.
The purpose of the invention is realized by the following technical scheme:
a combined foundation pit supporting structure based on frame piles and miniature composite piles is applied to a rock deep foundation pit or a soil-rock binary foundation pit with the thickness of no more than 6m of soil covering, and is characterized in that the combined foundation pit supporting structure comprises the frame piles arranged at intervals along the periphery of the inner wall of the foundation pit and a plurality of miniature composite piles arranged at intervals between the adjacent frame piles, the top parts of the frame piles and the miniature composite piles are connected into a whole through crown beams, a plurality of supports are horizontally erected between the frame piles on the opposite inner wall, wherein the supports on the first path in the vertical direction are reinforced concrete supports, and the supports on the second path and below in the vertical direction are steel supports.
The frame piles and the miniature composite piles are connected into a whole through purlins.
The frame pile is a cast-in-situ bored pile.
The miniature composite pile comprises a concrete pile body and a steel pipe positioned in the concrete pile body, and the concrete pile body and the steel pipe form an integrated structure.
And a plurality of sleeves are pre-embedded in the crown beam according to the designed position interval of each micro composite pile, and the micro composite piles penetrate through the sleeves to reach the designed elevation in the rock-soil layer.
The construction method of the miniature composite pile comprises the following steps: drilling a hole; placing the steel pipe in the drill hole to a designed elevation, wherein a slurry outlet hole is formed in the pipe wall of the steel pipe within the depth range of the rock stratum; and filling broken stones into the steel pipe, then grouting into the steel pipe to complete pile filling, and enabling the slurry to flow out of the range of rock strata outside the steel pipe through the slurry outlet hole so as to enable the steel pipe and surrounding rock strata to form bonding anchoring.
And the inner wall surface of a foundation pit formed by the frame column and the miniature composite pile is provided with a net hanging reinforcing steel bar, and concrete is sprayed on the net hanging reinforcing steel bar to form a net hanging reinforced concrete layer.
And when the environment allows, the concrete support and the steel support can be replaced by a pull anchor system.
The invention has the advantages that:
(1) through the bidirectional integral framework structure of the foundation pit, the stability requirements of broken lines, arcs, plane sliding damage and the like of rock masses in the shape of incidence such as the downdip along structural planes such as bedding planes, joint planes and the like are met, and the integral safety of the foundation pit is ensured;
(2) through the miniature composite pile, the wedge body and the local block body are prevented from being damaged, and the stability of broken belts, boulders, soil between piles and the like is ensured; the miniature composite piles are accurately positioned and flexibly arranged at intervals through the modularized embedded sleeves;
(3) the miniature composite pile is combined with the rock stratum fracture development condition during construction, and a local rock sliding body and a fixed body are cohered to form a diffused complex through grouting pressure adjustment, so that the anti-sliding performance of a rock and soil body at a sliding surface is improved, meanwhile, the miniature composite pile and peripheral loose rock and soil form a firmer anti-sliding whole together, and the lateral resistance of a rock slope is improved; slurry is diffused when the micro composite pile is constructed, and the cement slurry fills the cracks of the rock stratum, so that the cracks can be effectively prevented and reduced from being drained into a foundation pit, and the crack water initiation risk and drainage cost can be reduced;
(4) compared with the row pile supporting of the cast-in-place concrete pile, the construction cost is reduced by more than 40 percent; compared with the same-standard spray anchor support, the construction cost is reduced by 30-40%, and the construction period can be saved by 20-30%.
Drawings
FIG. 1 is a schematic plan view of a modular foundation pit support structure according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a cross-sectional view B-B of FIG. 1 in accordance with the present invention;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1 in accordance with the present invention;
FIG. 5 is a schematic view showing the connection between the steel pipe and the crown beam according to the present invention;
FIG. 6 is a vertical cross-sectional view of a micro-composite post according to the present invention;
FIG. 7 is a cross-sectional view taken along line D-D of FIG. 6 in accordance with the present invention;
FIG. 8 is a schematic plan view of the inter-pile net-hanging spray protection of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-8, reference numerals 1-12 in the drawings are: the concrete pile comprises a frame pile 1, a miniature composite pile 2, a crown beam 3, a reinforced concrete support 4, a purlin 5, a drill hole 6, a steel pipe 7, a concrete pile body 8, a grouting pipe 9, a net hanging reinforced concrete layer 10, a steel support 11 and reinforcing ribs 12.
Example (b): as shown in fig. 1-8, the embodiment specifically relates to a combined foundation pit supporting structure based on frame piles and micro composite piles, which is applied to a rock deep foundation pit or a soil-rock binary foundation pit covered with soil with a thickness of no more than 6m, and the combined foundation pit supporting structure mainly comprises frame piles 1 arranged at intervals along the peripheral wall surface of the foundation pit and a plurality of micro composite piles 2 arranged at intervals between adjacent frame piles 1, wherein the top of each frame pile 1 and the top of each micro composite pile 2 are respectively connected with a crown beam 3 to be connected into a whole, meanwhile, a plurality of supports are horizontally erected between the frame piles 1 on the opposite surface of the foundation pit, the first support in the vertical direction is a reinforced concrete support 4, a plurality of steel supports 11 are arranged according to the calculation requirement to jointly form an integral frame structure, and a broken line occurs along the structural surfaces such as the layer surface and the joint surface of a rock body meeting the forward-dip and other production conditions, And the stability requirements such as arc and plane sliding damage and the like are met, so that the integral safety of the foundation pit is ensured.
The frame piles 1 in the embodiment are cast-in-place bored piles, a plurality of supports are arranged between the opposite frame piles 1, as shown in fig. 2 and 3, the frame piles comprise a first reinforced concrete support 4 in the vertical direction and a steel support 11 below the first reinforced concrete support, and a plurality of horizontal steel supports at the lower part can be additionally arranged according to the checking calculation of the depth and stress of a foundation pit; in addition, enclosing purlins 5 are arranged between the frame piles 1 and the miniature composite piles 2 to integrally connect the piles, and reinforcing ribs 12 can be arranged locally according to deformation requirements.
As shown in fig. 5, a plurality of sleeves are embedded in the crown beam 3 according to the design position of each micro composite pile 2 in this embodiment, so that the micro composite piles 2 can penetrate through the sleeves when being set, and the micro composite piles 2 can be accurately positioned and flexibly arranged at intervals by the modulization embedded sleeves.
In this embodiment, the specific construction method of the micro composite pile 2 includes the following steps: firstly, drilling a design position of a miniature composite pile 2 to obtain a drilled hole 6; then placing the steel pipe 7 into the drill hole 6 to a designed elevation, wherein the steel pipe 7 is provided with a grouting pipe 9, and the grouting pipe 9 is provided with a grout outlet within the depth range of the rock stratum; filling broken stones into the steel pipe 7, then grouting into the steel pipe 7 to complete pile filling, and enabling concrete slurry to flow out of the range of the rock stratum outside the steel pipe 7 through the slurry outlet holes 9 so as to enable the rock stratum around the steel pipe 7 to form bonding anchoring and form a concrete pile body 8. It should be noted that, when the micro composite pile 2 is constructed, the formation fracture development condition is combined, and the slip of the local rock and the immobile rock are cohered to form a diffused complex through grouting pressure adjustment, so that the anti-slip performance of the rock and soil mass at the slip surface is improved, and meanwhile, the micro composite pile 2 and the peripheral loose rock and soil form a firmer anti-slip whole together, so that the lateral resistance of the rock slope is improved. Slurry diffusion effect during construction of the miniature composite pile 2, and the cement slurry fills the rock stratum cracks, so that crack water can be effectively prevented and reduced from being discharged into a foundation pit, and the crack water initiation risk and the drainage cost can be reduced. Through miniature composite pile, prevent wedge and local block destruction, guarantee to stabilize to broken area, boulder, soil between the stake etc..
As shown in fig. 8, mesh-hanging steel bars are provided on the surfaces of the frame piles 1 and the micro composite piles 2 inside the foundation pit, and concrete is sprayed on the mesh-hanging steel bars to form a mesh-hanging steel bar concrete layer 10.
Compared with the pile row supporting of the cast-in-place concrete pile, the combined foundation pit supporting structure in the embodiment has the advantage that the construction cost is reduced by more than 40%. Compared with the same-scale spray anchor support, the construction cost is reduced by 30-40%; the construction period can be saved by 20-30%.
Claims (7)
1. A combined foundation pit supporting structure based on frame piles and miniature composite piles is applied to a rock deep foundation pit or a soil-rock binary foundation pit with the thickness of no more than 6m of soil covering, and is characterized in that the combined foundation pit supporting structure comprises the frame piles arranged at intervals along the periphery of the inner wall of the foundation pit and a plurality of miniature composite piles arranged at intervals between the adjacent frame piles, the top parts of the frame piles and the miniature composite piles are connected into a whole through crown beams, a plurality of supports are horizontally erected between the frame piles on the opposite inner wall, wherein the supports on the first path in the vertical direction are reinforced concrete supports, and the supports on the second path and below in the vertical direction are steel supports.
2. The combined foundation pit supporting structure based on the frame piles and the micro composite piles as claimed in claim 1, wherein the frame piles and the micro composite piles are connected into a whole through purlins.
3. The combined foundation pit supporting structure based on the frame pile and the miniature composite pile as claimed in claim 1, wherein the frame pile is a cast-in-situ bored pile.
4. The combined foundation pit supporting structure based on the frame pile and the micro composite pile of claim 1, wherein the micro composite pile comprises a concrete pile body and a steel pipe positioned in the concrete pile body, and the concrete pile body and the steel pipe form an integrated structure.
5. The combined foundation pit supporting structure based on the frame piles and the micro composite piles as claimed in claim 1, wherein a plurality of sleeves are pre-embedded in the crown beams at intervals according to the designed positions of the micro composite piles, and the micro composite piles penetrate through the sleeves to the designed elevations in the rock-soil layer.
6. The combined foundation pit supporting structure based on the frame piles and the miniature composite piles as claimed in claim 4, wherein the construction method of the miniature composite piles is as follows: drilling a hole; placing the steel pipe in the drill hole to a designed elevation, wherein a slurry outlet hole is formed in the pipe wall of the steel pipe within the depth range of the rock stratum; and filling broken stones into the steel pipe, then grouting into the steel pipe to complete pile filling, and enabling the slurry to flow out of the range of rock strata outside the steel pipe through the slurry outlet hole so as to enable the steel pipe and surrounding rock strata to form bonding anchoring.
7. The combined foundation pit supporting structure based on the frame pile and the miniature composite pile as claimed in claim 1, wherein the inner wall surface of the foundation pit formed by the frame pile and the miniature composite pile is provided with a net hanging reinforcing steel bar, and the net hanging reinforcing steel bar is sprayed with concrete to form a net hanging reinforced concrete layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271581.2A CN113006086A (en) | 2021-03-12 | 2021-03-12 | Combination formula underground structure based on frame pile and miniature composite pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271581.2A CN113006086A (en) | 2021-03-12 | 2021-03-12 | Combination formula underground structure based on frame pile and miniature composite pile |
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| CN113006086A true CN113006086A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110271581.2A Pending CN113006086A (en) | 2021-03-12 | 2021-03-12 | Combination formula underground structure based on frame pile and miniature composite pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753382A (en) * | 2022-05-17 | 2022-07-15 | 中铁第六勘察设计院集团有限公司 | Combined portal type foundation pit supporting system and construction method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410154A (en) * | 2013-08-23 | 2013-11-27 | 河南省纳川基础工程有限公司 | Constructing method for high-pressure grouting of revetment small piles |
| CN210216444U (en) * | 2019-04-30 | 2020-03-31 | 赵志强 | Foundation pit supporting structure of section steel micro pile combined cast-in-place pile |
| CN210238492U (en) * | 2019-07-09 | 2020-04-03 | 中建丝路建设投资有限公司 | Crown beam type miniature pile construction formwork capable of being circulated |
-
2021
- 2021-03-12 CN CN202110271581.2A patent/CN113006086A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410154A (en) * | 2013-08-23 | 2013-11-27 | 河南省纳川基础工程有限公司 | Constructing method for high-pressure grouting of revetment small piles |
| CN210216444U (en) * | 2019-04-30 | 2020-03-31 | 赵志强 | Foundation pit supporting structure of section steel micro pile combined cast-in-place pile |
| CN210238492U (en) * | 2019-07-09 | 2020-04-03 | 中建丝路建设投资有限公司 | Crown beam type miniature pile construction formwork capable of being circulated |
Non-Patent Citations (1)
| Title |
|---|
| 伍孝波编著, 中国电力出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753382A (en) * | 2022-05-17 | 2022-07-15 | 中铁第六勘察设计院集团有限公司 | Combined portal type foundation pit supporting system and construction method thereof |
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