CN110952569A - Inclined support type deep foundation pit supporting structure and construction method - Google Patents
Inclined support type deep foundation pit supporting structure and construction method Download PDFInfo
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- CN110952569A CN110952569A CN201911389125.7A CN201911389125A CN110952569A CN 110952569 A CN110952569 A CN 110952569A CN 201911389125 A CN201911389125 A CN 201911389125A CN 110952569 A CN110952569 A CN 110952569A
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- foundation pit
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- inclined support
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/223—Details of top sections of foundation piles
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- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention discloses an inclined support type deep foundation pit supporting structure and a construction method, wherein the inclined support type deep foundation pit supporting structure comprises a foundation pit (13); arranging piles (2) which are arranged at intervals along the edge of the foundation pit and used for resisting a soil body (1) outside the foundation pit; the tops of all the row piles are connected into a whole through the crown beam (3), and the middle upper parts of all the row piles are connected into a whole through the waist beam (4); a connecting steel plate (14) for connecting the temporary inclined support lattice column (5) is embedded in one side of the waist rail close to the foundation pit; double anchor piles (7) which are arranged at intervals are arranged at the bottom of the foundation pit and close to the row piles, the tops of the double anchor piles are connected into a whole through a bearing platform (6), and a connecting steel plate (14) for connecting the temporary inclined support lattice column is embedded at one side of the bearing platform close to the row piles; two ends of the temporary inclined supporting lattice column are respectively welded with the waist beam and a connecting steel plate (14) on the bearing platform. The method has the advantages of convenient material taking, simple construction, labor cost saving, quick construction, no influence on underground structure construction, no need of reserving soil at the edge of the foundation pit, and suitability for general popularization.
Description
Technical Field
The invention relates to an inclined support type deep foundation pit supporting structure and a construction method, and belongs to the technical field of building engineering.
Background
In the aspects of underground space engineering, building foundation pit engineering and the like, under the condition that the depth of a foundation pit exceeds 5m, an inner support is generally required to be arranged on a foundation pit support to resist the lateral pressure of the foundation pit and control the deformation of the foundation pit. In the prior art, a reinforced concrete inner support is generally adopted, and the concrete support has the defects of resource waste, difficulty in construction and dismantling, long construction period, high cost and the like. Along with the continuous development of the technology, the steel pipe support or the steel structure support is also applied to a certain extent, but large-scale hoisting equipment is needed for installation, the installation is difficult, the deformation of the steel structure after stress causes the deformation of a foundation pit to be large, and the safety risk exists. Therefore, the existing technologies are not perfect enough and are expected to be further improved.
Disclosure of Invention
The invention aims to provide an inclined support type deep foundation pit supporting structure and a construction method, which aim to solve the defects of resource waste, difficulty in construction and dismantling, long construction period, high cost and the like of the conventional reinforced concrete inner support; the problems that the existing steel pipe or steel structure support needs large-scale hoisting equipment for installation and is difficult to install, and the steel structure deforms after stress to cause larger foundation pit deformation and safety risk exist are solved, so that the defects of the prior art are overcome.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an inclined support type deep foundation pit supporting structure; comprises a foundation pit; arranging piles at intervals along the edge of the foundation pit for resisting soil outside the pit; the tops of all the row piles are connected into a whole through the crown beam, and the middle upper parts of all the row piles are connected into a whole through the waist beam; a connecting steel plate for connecting the temporary inclined support lattice column is embedded in one side of the waist rail close to the foundation pit; double-anchor piles which are arranged at intervals are arranged at the bottom of the foundation pit close to the row piles, the tops of the double-anchor piles are connected into a whole through a bearing platform, and connecting steel plates for connecting temporary inclined support lattice columns are pre-embedded at one side of the bearing platform close to the row piles; and two ends of the temporary inclined supporting lattice column are respectively welded with the waist beam and the connecting steel plate on the bearing platform.
Among the aforementioned oblique supporting formula deep basal pit supporting construction, the waist rail leans on foundation ditch one side to be downward inclined plane, and the cushion cap leans on campshed one side to be upward inclined plane, and downward inclined plane is parallel with the upward inclined plane, connects on the pre-buried two inclined planes of steel sheet.
In the inclined support type deep foundation pit supporting structure, the row piles and the double anchor piles are reinforced concrete cast-in-situ bored piles; and cement soil stirring layers are arranged on the outer sides of the row piles and around the double-anchor piles.
In the inclined support type deep foundation pit supporting structure, the temporary inclined support lattice column is a columnar member formed by welding angle steel and steel plates; the included angle between the temporary oblique supporting lattice column and the ground plane is not more than 45 degrees.
In the inclined support type deep foundation pit supporting structure, the bearing platform is of a reinforced concrete cast-in-place structure, and the height of the top of the bearing platform is more than 200mm lower than the bottom surface of the foundation pit.
The construction method for the inclined support type deep foundation pit supporting structure comprises the following steps of;
a) drilling a row of pouring holes at the edge of the designed foundation pit, and constructing row piles in a reinforced concrete cast-in-place pile mode;
b) drilling pouring holes on the inner side of the edge of the designed foundation pit corresponding to each row of piles, and constructing double anchor piles in a reinforced concrete cast-in-place pile mode; controlling the pouring elevation of the double-anchor pile concrete below the bottom surface of the foundation pit;
c) slotting the ground at the tops of the row piles, performing crown beam construction, and connecting the tops of all the row piles into a whole;
d) excavating foundation pits in layers to reach the elevation of the waist rail, and constructing the waist rail; embedding a connecting steel plate when pouring the waist beam concrete;
e) excavating the foundation pit to the bottom of the pit in a layered mode, and reserving soil bodies with cross sections which are right trapezoid corners at the edge of the foundation pit and the corners of the bottom of the pit in the excavating process;
f) digging under the position of the double anchor piles until the height of a bearing platform surface is higher, constructing the bearing platform, and embedding a connecting steel plate when pouring concrete of the bearing platform;
g) excavating an inclined groove on the reserved soil body of the corner, and welding two ends of the temporary inclined supporting lattice column with the waist beam and the connecting steel plate on the bearing platform;
h) excavating a corner reserved soil body, and constructing a bottom plate and a bottom plate support plate belt of a foundation pit;
i) constructing a negative second-layer wall column, a negative second-layer floor and a negative second-layer support plate strip;
j) after the supporting plate replacing belt of the negative two layers reaches the design strength, the temporary oblique supporting lattice column is dismantled;
k) and backfilling soil between the outer wall of the structure and the row piles.
In the construction method, when the foundation pit is excavated to the waist rail elevation in a layered mode and soil is reserved at the excavation corner, construction of a cement soil mixing layer is carried out on the outer side of the row piles.
In the construction method, when the double-anchor pile is dug to the height of the bearing platform surface, the cement-soil mixing layer construction is firstly carried out on the periphery of the double-anchor pile, and then the bearing platform construction is carried out.
In the construction method, the cement-soil stirring layer is a waterproof curtain formed by mixing concrete and cement formed by adopting three-axis stirring or five-axis stirring.
Due to the adoption of the technical scheme, compared with the prior art, the invention utilizes the row pile and cement soil stirring layer as the enclosure body, and the soil body and the underground water outside the pit are blocked by the enclosure body. The lateral pressure of the soil body outside the pit and the underground water is born by the double anchor piles through the row piles, the waist beams, the temporary inclined supporting lattice columns and the bearing platforms finally, and the double anchor piles have the characteristics of reasonable stress and strong stability. Materials are convenient to obtain in the construction process, the construction is simple, the labor cost is saved, the construction can be carried out quickly, and the construction of an underground structure is not influenced. The construction method of arranging the upright post piles and the reinforced concrete diagonal braces or corner braces in the foundation pit in the prior art can be replaced. Is suitable for being popularized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The labels in the figures are: the method comprises the following steps of 1-soil outside a pit, 2-row piles, 3-crown beams, 4-waist beams, 5-temporary inclined supporting lattice columns, 6-bearing platforms, 7-double anchor piles, 8-corner reserved soil, 9-foundation pit bottom plates, 10-bottom plate support replacing plate strips, 11-negative two-layer floor slabs, 12-negative two-layer support replacing plate strips, 13-foundation pits, 14-connecting steel plates and 15-cement soil stirring layers.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention relates to an inclined support type deep foundation pit supporting structure; as shown in fig. 1, includes a foundation pit 13; arranging piles 2 which are arranged at intervals along the edge of the foundation pit 13 and used for resisting soil bodies 1 outside the foundation pit are arranged at the edge of the foundation pit 13; the tops of all the row piles 2 are connected into a whole through the crown beam 3, and the middle upper parts of all the row piles 2 are connected into a whole through the waist beam 4; a connecting steel plate 14 for connecting the temporary inclined support lattice column 5 is embedded in one side of the waist beam 4 close to the foundation pit 13; double anchor piles 7 which are arranged at intervals are arranged at the bottom of the foundation pit 13 and close to the row piles 2, the tops of the double anchor piles 7 are connected into a whole through bearing platforms 6, and connecting steel plates 14 for connecting the temporary inclined supporting lattice columns 5 are embedded in one sides of the bearing platforms 6 close to the row piles 2; and two ends of the temporary inclined supporting lattice column 5 are respectively welded with the waist rail 4 and the connecting steel plate 14 on the bearing platform 6. The side of the waist rail 4 close to the foundation pit 13 is a downward inclined plane, the side of the bearing platform 6 close to the row piles 2 is an upward inclined plane, the downward inclined plane is parallel to the upward inclined plane, and the connecting steel plates 14 are embedded on the two inclined planes. The row piles 2 and the double anchor piles 7 are reinforced concrete cast-in-situ bored piles; and cement soil stirring layers 15 are arranged on the outer sides of the row piles 2 and around the double-anchor piles 7. The temporary inclined support lattice column 5 is a columnar member formed by welding angle steel and steel plates; the included angle between the temporary oblique supporting lattice column 5 and the ground plane is not more than 45 degrees. The bearing platform 6 is a reinforced concrete cast-in-place structure, and the height of the top of the bearing platform 6 is more than 200mm lower than the bottom surface of the foundation pit 13.
The construction method for the inclined support type deep foundation pit supporting structure disclosed by the invention comprises the following steps of:
a) drilling a row of pouring holes at the edge of the designed foundation pit, and constructing a row of piles 2 in a reinforced concrete cast-in-place pile mode;
b) drilling pouring holes on the inner side of the edge of the designed foundation pit corresponding to each row of piles 2 to construct a double-anchor pile 7 in a reinforced concrete cast-in-place pile mode; the pouring elevation of the concrete of the double anchor piles 7 is controlled below the bottom surface of the foundation pit 13;
c) slotting the ground at the tops of the row piles 2, constructing the crown beam 3, and connecting the tops of all the row piles 2 into a whole;
d) excavating foundation pits 13 in layers to reach the elevation of the waist rail 4, and constructing the waist rail 4; embedding the connecting steel plate 14 when pouring the waist beam concrete;
e) excavating a foundation pit 13 to the bottom of the pit in a layered mode, and reserving a corner reserved soil body 8 with a right trapezoid cross section at the edge of the foundation pit 13 and the corner of the bottom of the pit in the excavation process;
f) digging the position of the double anchor piles 7 to the elevation of the surface of the bearing platform 6, constructing the bearing platform 6, and embedding the connecting steel plates 14 when pouring concrete on the bearing platform 6;
g) excavating a chute on the corner reserved soil body 8, and welding two ends of the temporary inclined supporting lattice column 5 with the waist beam 4 and the connecting steel plate 14 on the bearing platform 6;
h) excavating a corner reserved soil body 8, and constructing a bottom plate 9 and a bottom plate support plate replacement belt 10 of a foundation pit 13;
i) constructing a negative second-layer wall column, a negative second-layer floor 11 and a negative second-layer support plate replacing belt 12;
j) after the supporting plate belt 12 of the second layer reaches the design strength, the temporary inclined supporting lattice column 5 is removed;
k) and backfilling soil between the outer wall of the structure and the row piles 2.
In the construction method of the inclined support type deep foundation pit supporting structure, when the foundation pit 13 is excavated in layers to reach the elevation of the waist beam 4 and the soil body 8 is reserved at the excavation corner, the construction of the cement-soil stirring layer 15 is carried out on the outer side of the row piles 2. When the position of the double anchor piles 7 is dug to the elevation of the surface of the bearing platform 6, the construction of the cement soil stirring layer 15 is firstly carried out around the double anchor piles 7, and then the construction of the bearing platform 6 is carried out. The soil cement mixing layer 15 is a waterproof curtain formed by mixing concrete and cement formed by three-axis mixing or five-axis mixing.
The lateral pressure generated by the soil outside the pit is transmitted to the row piles, transmitted to the waist beam through the row piles, transmitted to the inclined supporting lattice column through the waist beam, transmitted to the bearing platform and finally borne by the anchor piles and the soil on the lower part, and the vertical pile piles and the reinforced concrete counter braces or corner braces do not need to be arranged in the foundation pit. The method has the advantages of convenient material taking, simple construction, labor cost saving, quick construction, no influence on underground structure construction, no need of reserving soil at the edge of the foundation pit, and suitability for general popularization.
Claims (9)
1. An inclined support type deep foundation pit supporting structure; comprises a foundation pit (13); the method is characterized in that: arranging piles (2) which are arranged at intervals along the edge of the foundation pit (13) and used for resisting a soil body (1) outside the foundation pit; the tops of all the row piles (2) are connected into a whole through the crown beam (3), and the middle upper parts of all the row piles (2) are connected into a whole through the waist beam (4); a connecting steel plate (14) for connecting the temporary inclined support lattice column (5) is embedded in one side of the waist beam (4) close to the foundation pit (13); double anchor piles (7) which are arranged at intervals are arranged at the bottom of the foundation pit (13) and close to the row piles (2), the tops of the double anchor piles (7) are connected into a whole through bearing platforms (6), and connecting steel plates (14) used for connecting temporary inclined supporting lattice columns (5) are embedded in one sides of the bearing platforms (6) close to the row piles (2); two ends of the temporary inclined supporting lattice column (5) are respectively welded with the waist beam (4) and the connecting steel plate (14) on the bearing platform (6).
2. The inclined support type deep foundation pit supporting structure according to claim 1, wherein: waist rail (4) lean on foundation ditch (13) one side to be down inclined plane, cushion cap (6) lean on campshed (2) one side to be the inclined plane that makes progress, and the inclined plane that makes progress is parallel with the inclined plane that makes progress, on two pre-buried inclined planes of connecting steel sheet (14).
3. The inclined support type deep foundation pit supporting structure according to claim 1, wherein: the row piles (2) and the double anchor piles (7) are reinforced concrete cast-in-situ bored piles; and cement soil stirring layers (15) are arranged on the outer sides of the row piles (2) and the peripheries of the double-anchor piles (7).
4. The inclined support type deep foundation pit supporting structure according to claim 1, wherein: the temporary inclined support lattice column (5) is a columnar member formed by welding angle steel and steel plates; the included angle between the temporary oblique supporting lattice column (5) and the ground plane is not more than 45 degrees.
5. The inclined support type deep foundation pit supporting structure according to claim 1, wherein: the bearing platform (6) is of a reinforced concrete cast-in-place structure, and the height of the top of the bearing platform (6) is more than 200mm lower than the bottom surface of the foundation pit (13).
6. A construction method for any one of the inclined support type deep foundation pit supporting structures of claims 1-5 is characterized in that: the method comprises the following steps of construction;
drilling a row of pouring holes at the edge of the designed foundation pit, and constructing row piles in a reinforced concrete cast-in-place pile mode;
drilling pouring holes on the inner side of the edge of the designed foundation pit corresponding to each row of piles, and constructing double anchor piles in a reinforced concrete cast-in-place pile mode; controlling the pouring elevation of the double-anchor pile concrete below the bottom surface of the foundation pit;
slotting the ground at the tops of the row piles, performing crown beam construction, and connecting the tops of all the row piles into a whole;
excavating foundation pits in layers to reach the elevation of the waist rail, and constructing the waist rail; embedding a connecting steel plate when pouring the waist beam concrete;
excavating the foundation pit to the bottom of the pit in a layered mode, and reserving soil bodies with cross sections which are right trapezoid corners at the edge of the foundation pit and the corners of the bottom of the pit in the excavating process;
digging under the position of the double anchor piles until the height of a bearing platform surface is higher, constructing the bearing platform, and embedding a connecting steel plate when pouring concrete of the bearing platform;
excavating an inclined groove on the reserved soil body of the corner, and welding two ends of the temporary inclined supporting lattice column with the waist beam and the connecting steel plate on the bearing platform;
excavating a corner reserved soil body, and constructing a bottom plate and a bottom plate support plate belt of a foundation pit;
constructing a negative second-layer wall column, a negative second-layer floor and a negative second-layer support plate strip;
after the supporting plate replacing belt of the negative two layers reaches the design strength, the temporary oblique supporting lattice column is dismantled;
and backfilling soil between the outer wall of the structure and the row piles.
7. The construction method according to claim 6, wherein: and when the foundation pit is excavated to the waist rail elevation in a layered manner and the soil body is reserved at the excavation corner, constructing a cement soil stirring layer on the outer side of the row piles.
8. The construction method according to claim 6, wherein: when the double-anchor pile is dug to the height of the bearing platform, the cement soil stirring layer construction is firstly carried out on the periphery of the double-anchor pile, and then the bearing platform construction is carried out.
9. The construction method according to claim 7 or 8, wherein: the cement-soil stirring layer is a waterproof curtain formed by mixing concrete and cement formed by adopting three-axis stirring or five-axis stirring.
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| CN201911389125.7A CN110952569A (en) | 2019-12-30 | 2019-12-30 | Inclined support type deep foundation pit supporting structure and construction method |
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| CN201911389125.7A CN110952569A (en) | 2019-12-30 | 2019-12-30 | Inclined support type deep foundation pit supporting structure and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087993A (en) * | 2021-11-27 | 2022-02-25 | 侯剑 | Dynamic monitoring construction method for in-situ foundation pit inclined support counterforce device |
| CN114575356A (en) * | 2022-04-15 | 2022-06-03 | 中国建筑第二工程局有限公司 | Foundation pit supporting structure, supporting pile transaction processing method and basement construction method |
| CN114703869A (en) * | 2022-04-29 | 2022-07-05 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space diagonal bracing in foundation pit support |
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
-
2019
- 2019-12-30 CN CN201911389125.7A patent/CN110952569A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114087993A (en) * | 2021-11-27 | 2022-02-25 | 侯剑 | Dynamic monitoring construction method for in-situ foundation pit inclined support counterforce device |
| CN114087993B (en) * | 2021-11-27 | 2023-08-04 | 侯剑 | Dynamic monitoring construction method of in-situ foundation pit inclined support counterforce device |
| CN114575356A (en) * | 2022-04-15 | 2022-06-03 | 中国建筑第二工程局有限公司 | Foundation pit supporting structure, supporting pile transaction processing method and basement construction method |
| CN114575356B (en) * | 2022-04-15 | 2024-01-05 | 中国建筑第二工程局有限公司 | Foundation pit supporting structure, supporting pile abnormal movement processing method and basement construction method |
| CN114703869A (en) * | 2022-04-29 | 2022-07-05 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space diagonal bracing in foundation pit support |
| CN114703869B (en) * | 2022-04-29 | 2024-01-26 | 中国核工业芜湖基础工程有限公司 | Construction process of confined space inclined support in foundation pit support |
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
| CN115506362B (en) * | 2022-09-02 | 2023-07-25 | 中国建筑第二工程局有限公司 | Mucky soil deep and shallow foundation pit supporting structure and construction method thereof |
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