CN111733827A - Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology - Google Patents
Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology Download PDFInfo
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- CN111733827A CN111733827A CN202010608501.3A CN202010608501A CN111733827A CN 111733827 A CN111733827 A CN 111733827A CN 202010608501 A CN202010608501 A CN 202010608501A CN 111733827 A CN111733827 A CN 111733827A
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- foundation pit
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- pile
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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
- E02D23/00—Caissons; Construction or placing of caissons
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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
A protection construction method for a deep foundation pit of a station yard under a high-speed rail complex environment sludge geology is provided. The method comprises the steps of construction preparation, fender pile construction, foundation pit top support and preliminary excavation, existing concrete structure chiseling, manual continuous excavation, concrete bottom sealing and the like. The invention has the following effects: the protection construction method of the concrete bored pile and the jet grouting pile of the traditional foundation pit is changed into the protection construction method of the concrete bored pile and the steel caisson, wherein the concrete bored pile mainly plays a role in shearing resistance, and the steel caisson plays a role in water prevention and sand prevention, so that a protection system of the whole deep foundation pit is formed. In the excavation process, the protection system of concrete bored pile plus steel caisson has both guaranteed the foundation ditch safety and stability, can prevent again that secret water pressure from too big time, and the underground gushes water, gushes sand, causes existing circuit to subside, has guaranteed the safety of business line.
Description
Technical Field
The invention belongs to the technical field, and particularly relates to a station yard deep foundation pit protection construction method under the adjacent high-speed rail complex environment silt geology.
Background
For the construction of a deep foundation pit of a station under the condition of adjacent high-speed rail complex environment sludge geology, the foundation pit protection generally adopts a protection construction method of a concrete drilling pile and a rotary spraying pile. In addition, the phenomenon of water gushing and sand gushing can occur in the excavation process, and existing lines are settled as a result, so that the protection construction method is difficult to meet the operation safety requirements of existing high-speed rails in the construction process under the conditions. In addition, if a small foundation pit such as an elevator shaft is required to be arranged in the foundation pit, collapse, quicksand, groundwater backflow and the like are likely to occur when the small foundation pit is continuously excavated, so that the construction progress and safety are affected.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a protection construction method for a deep foundation pit of a station yard under a high-speed rail complex environment silt geology.
In order to achieve the aim, the protection construction method for the deep foundation pit of the station yard under the adjacent high-speed rail complex environment silt geology provided by the invention comprises the following steps in sequence:
1) before construction, according to geological conditions and in consideration of the safety of a high-speed rail business line, prefabricating a steel casing and a steel caisson for a bored pile, and arranging a mud box at one side of a deep foundation pit to be constructed;
2) according to the design requirement, a percussion drill is adopted at the edge of a deep foundation pit to be constructed to form holes, a plurality of drill holes are formed at intervals in a mud wall protection mode, one distance is drilled every time, the drill holes are checked and cleaned, then a section of steel casing is arranged on the side wall of each drill hole, the operation is repeated until the design depth of the concrete drilling pile is reached, then a steel reinforcement cage is placed in each drill hole provided with the steel casing, then concrete is poured into the drill holes, and a plurality of concrete drilling piles are manufactured after the concrete is solidified and reaches the design strength and serve as foundation pit retaining piles;
3) manually chiseling off the pile head of the concrete bored pile, then performing crown beam construction on the upper end of the concrete bored pile chiseled off the pile head, and embedding a plurality of steel plates on the inner side surface of the crown beam at intervals during the crown beam construction;
4) excavating a soil body on the inner side of the concrete bored pile, and respectively welding two ends of a plurality of transverse supports on a pair of corresponding steel plates on the crown beam when the soil body is excavated to a position 1m away from the top of the concrete bored pile; continuously excavating the soil body to the position of the existing concrete structure;
5) chiseling the existing concrete structure to the base elevation of the main foundation pit by using a breaking hammer, thereby forming the main foundation pit;
6) the method comprises the following steps of (1) placing a steel caisson on the bottom surface of a main foundation pit, accurately positioning the steel caisson at the position of a small foundation pit, then manually continuously excavating a soil body in the steel caisson, gradually sinking the steel caisson while excavating the soil body until the lower end of the steel caisson reaches the base elevation of the small foundation pit, and forming the small foundation pit, wherein the steel caisson is used as a protective structure of the small foundation pit;
7) and (3) utilizing the pump truck to pour concrete to seal the bottom of the main foundation pit and the small foundation pit, ensuring that no water gushing and sand gushing phenomenon exists underground, and then pouring other position cushions, thereby completing the construction process of the protection system of the whole deep foundation pit.
In the step 1), the thickness of the steel casing is 6mm, the height of the steel casing is 250cm, and the inner diameter of the steel casing is 100 cm; the mud box is formed by welding steel plates with the length of 6m, the width of 2m and the thickness of 15 mm; the steel caisson is formed by welding waste bridge pier templates.
In the step 2), the pile diameter of the concrete bored pile is 0.8m, the pile spacing is 1.0m, and the pile length is 6-18 m.
In the step 3), the height of the chiseled pile head is 1 meter; the height of the crown beam is 1 meter, the width of the crown beam is 0.8 meter, the crown beam is of a reinforced concrete structure, the thickness of a protective layer is 40mm, the concrete is C30 concrete, and the main reinforcement is HRB400 phi 22 steel bars.
In the step 4), a steel pipe with the diameter of 50cm is adopted as the transverse support; the soil body adopts the excavation mode of segmentation, layering, symmetry, balance, time limit, and the layering thickness is 3.5 meters, and the length is 6 meters.
The station yard deep foundation pit protection construction method under the adjacent high-speed rail complex environment silt geology provided by the invention has the following beneficial effects:
1. the protection construction method of the concrete bored pile and the jet grouting pile of the traditional foundation pit is changed into the protection construction method of the concrete bored pile and the steel caisson, wherein the concrete bored pile mainly plays a role in shearing resistance, and the steel caisson plays a role in water prevention and sand prevention, so that a protection system of the whole deep foundation pit is formed.
2. In the excavation process, the protection system of concrete bored pile plus steel caisson has both guaranteed the foundation ditch safety and stability, can prevent again that secret water pressure from too big time, and the underground gushes water, gushes sand, causes existing circuit to subside, has guaranteed the safety of business line.
Drawings
FIG. 1 is a flow chart of a station yard deep foundation pit protection construction method under the adjacent high-speed rail complex environment silt geology provided by the invention.
FIG. 2 is a plan view of a deep foundation pit in the station yard deep foundation pit protection construction method under the adjacent high-speed rail complex environment silt geology provided by the invention.
FIG. 3 is a side view of a deep foundation pit during the construction method for protecting the deep foundation pit of the station yard under the adjacent high-speed rail complex environment silt geology provided by the invention.
Detailed Description
In reconstruction projects of a certain railway engineering station, the geological environment of the station is complex, the underground concrete structure is large, the soil quality is soft, and the underground water is abundant. In order to ensure the construction safety and the operation safety of the existing business line, the applicant utilizes the method for protecting and constructing the deep foundation pit of the station yard under the adjacent high-speed rail complex environment silt geology to construct the deep foundation pit, thereby effectively preventing the influence of collapse, quicksand, groundwater backflow and other conditions on the engineering and ensuring the construction progress and safety.
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1-3, the method for protecting and constructing the deep foundation pit of the station yard under the adjacent high-speed rail complex environment silt geology provided by the invention comprises the following steps in sequence:
1) before construction, according to geological conditions and considering the safety of a high-speed rail business line, prefabricating a steel casing for a bored pile and a steel caisson 4, and arranging a mud box at one side of a deep foundation pit 1 to be constructed; in the invention, the thickness of the steel casing is 6mm, the height is 250cm, and the inner diameter is 100 cm; the mud box is formed by welding steel plates with the length of 6m, the width of 2m and the thickness of 15 mm; the steel caisson 4 is formed by welding waste pier templates.
2) According to the design requirement, a percussion drill is adopted at the edge of a deep foundation pit 1 to be constructed to form holes, a plurality of drill holes are formed at intervals in a mud wall protection mode, one distance is drilled every time, the drill holes are checked and cleaned, then a section of steel casing is arranged on the side wall of each drill hole, the operation is repeated until the design depth of a concrete drilling pile 2 is reached, then a steel reinforcement cage is placed in each drill hole provided with the steel casing, concrete is poured into the drill holes, and a plurality of concrete drilling piles 2 are manufactured after the concrete is solidified and reaches the design strength to serve as foundation pit enclosure piles; in the invention, the pile diameter of the concrete bored pile 2 is 0.8m, the pile spacing is 1.0m, and the pile length is 6-18 m; during drilling, a small-stroke hole is drilled, after the drilling enters a normal drilling state, a large-stroke of 4-5 m is adopted, the maximum stroke is not more than 6m, and slag is removed in time during the drilling process. And (4) paying attention to stratum change, extracting slag samples at the stratum change position to judge the geological category, making relevant records by comparing the geological category with a geological profile provided by design, and adjusting the drilling process in time according to geological conditions. The joint of the main reinforcement of the reinforcement cage adopts double-sided lap welding, the number of joints on each section is not more than 50 percent, and the reinforcement stirrup and the main reinforcement are connected and completely welded. And cleaning the hole by adopting a slurry pumping method, and continuously sucking the slag for about 5-15 min by using a slurry pump of the percussion drilling machine to clean the drilling slag at the bottom of the hole. And after the steel reinforcement cage and the guide pipe are finished, the guide pipe is utilized to carry out secondary hole cleaning, so that the slurry index and the thickness of sediment at the bottom of the hole in the drilled hole after hole cleaning meet the design and specification requirements. When cleaning and deslagging, the water head in the drill hole is kept to prevent collapse. And immediately pouring concrete after the secondary hole cleaning is finished.
3) And (3) manually chiseling off the pile head of the concrete bored pile 2, then performing crown beam construction on the upper end of the concrete bored pile 2 chiseled off the pile head, and embedding a plurality of steel plates on the inner side surface of the crown beam at intervals during the crown beam construction. In the invention, the height of the chiseled pile head is 1 meter; the height of the crown beam is 1 meter, the width of the crown beam is 0.8 meter, the crown beam is of a reinforced concrete structure, the thickness of a protective layer is 40mm, the concrete is C30 concrete, and the main reinforcement is HRB400 phi 22 steel bars.
4) Excavating a soil body on the inner side of the concrete bored pile 2, and when the soil body is excavated to a position 1m away from the top of the concrete bored pile 2, respectively welding two ends of a plurality of transverse supports 3 on a corresponding pair of steel plates on the crown beam; continuously excavating the soil body to the position of the existing concrete structure, such as the existing retaining wall foundation or a tubular pile cap; in the present invention, the lateral supports 3 are steel pipes having a diameter of 50 cm. The soil body adopts a segmented, layered, symmetrical, balanced and time-limited excavation mode, the layered thickness is 3.5 meters, the length is 6 meters, and the excavation needs to be completed within 9 hours;
5) chiseling the existing concrete structure to the base elevation of the main foundation pit by using a breaking hammer, thereby forming the main foundation pit;
6) the steel caisson 4 is placed on the bottom surface of the main foundation pit and accurately positioned at the position of the small foundation pit, then the soil body is continuously excavated inside the steel caisson 4 manually, the steel caisson 4 gradually sinks while excavating the soil body until the lower end of the steel caisson 4 reaches the base elevation of the small foundation pit, so that the small foundation pit is formed, and the steel caisson 4 is used as a protective structure of the small foundation pit;
7) and (3) utilizing the pump truck to pour concrete to seal the bottom of the main foundation pit and the small foundation pit, ensuring that no water gushing and sand gushing phenomenon exists underground, and then pouring other position cushion layers, thereby completing the construction process of the protection system of the whole deep foundation pit 1.
Claims (5)
1. A protection construction method for a deep foundation pit of a station yard under a high-speed rail complex environment sludge geology is characterized by comprising the following steps: the construction method comprises the following steps in sequence:
1) before construction, according to geological conditions and in consideration of the safety of a high-speed rail business line, prefabricating a steel casing and a steel caisson (4) for a bored pile, and arranging a mud box at one side of a deep foundation pit (1) to be constructed;
2) according to design requirements, a percussion drill is adopted at the edge of a deep foundation pit (1) to be constructed to form holes, a plurality of drill holes are formed at intervals in a mud retaining wall mode, one distance is drilled every time, the drill holes are checked and cleaned, then a section of steel retaining cylinder is arranged on the side wall of each drill hole, the operation is repeated until the design depth of a concrete drilling pile (2) is reached, then a steel reinforcement cage is placed in each drill hole provided with the steel retaining cylinder, concrete is poured into the drill holes, and a plurality of concrete drilling piles (2) are manufactured after the concrete is solidified and reaches the design strength to serve as foundation pit retaining piles;
3) manually chiseling off the pile head of the concrete bored pile (2), then performing crown beam construction on the upper end of the concrete bored pile (2) chiseled off the pile head, and embedding a plurality of steel plates on the inner side surface of the crown beam at intervals during the crown beam construction;
4) excavating a soil body on the inner side of the concrete bored pile (2), and when the soil body is excavated to a position 1m away from the top of the concrete bored pile (2), respectively welding two ends of a plurality of transverse supports (3) on a pair of corresponding steel plates on the crown beam; continuously excavating the soil body to the position of the existing concrete structure;
5) chiseling the existing concrete structure to the base elevation of the main foundation pit by using a breaking hammer, thereby forming the main foundation pit;
6) the steel caisson (4) is placed on the bottom surface of the main foundation pit and accurately positioned at the position of the small foundation pit, then the soil body is continuously excavated inside the steel caisson (4) manually, the steel caisson (4) is gradually sunk while the soil body is excavated until the lower end of the steel caisson (4) reaches the base elevation of the small foundation pit, so that the small foundation pit is formed, and the steel caisson (4) is used as a protective structure of the small foundation pit;
7) and (3) utilizing the pump truck to pour concrete to seal the bottom of the main foundation pit and the small foundation pit, ensuring that no water gushing and sand gushing phenomenon exists underground, and then pouring other position cushion layers, thereby completing the construction process of the protection system of the whole deep foundation pit (1).
2. The protection construction method for the deep foundation pit of the underground station yard adjacent to the high-speed rail complex environment sludge geology according to claim 1, which is characterized in that: in the step 1), the thickness of the steel casing is 6mm, the height of the steel casing is 250cm, and the inner diameter of the steel casing is 100 cm; the mud box is formed by welding steel plates with the length of 6m, the width of 2m and the thickness of 15 mm; the steel caisson (4) is formed by welding waste pier templates.
3. The protection construction method for the deep foundation pit of the underground station yard adjacent to the high-speed rail complex environment sludge geology according to claim 1, which is characterized in that: in the step 2), the pile diameter of the concrete bored pile (2) is 0.8m, the pile spacing is 1.0m, and the pile length is 6-18 m.
4. The protection construction method for the deep foundation pit of the underground station yard adjacent to the high-speed rail complex environment sludge geology according to claim 1, which is characterized in that: in the step 3), the height of the chiseled pile head is 1 meter; the height of the crown beam is 1 meter, the width of the crown beam is 0.8 meter, the crown beam is of a reinforced concrete structure, the thickness of a protective layer is 40mm, the concrete is C30 concrete, and the main reinforcement is HRB400 phi 22 steel bars.
5. The protection construction method for the deep foundation pit of the underground station yard adjacent to the high-speed rail complex environment sludge geology according to claim 1, which is characterized in that: in the step 4), a steel pipe with the diameter of 50cm is adopted as the transverse support (3); the soil body adopts the excavation mode of segmentation, layering, symmetry, balance, time limit, and the layering thickness is 3.5 meters, and the length is 6 meters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010608501.3A CN111733827A (en) | 2020-06-29 | 2020-06-29 | Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology |
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| CN202010608501.3A CN111733827A (en) | 2020-06-29 | 2020-06-29 | Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585273A (en) * | 2021-08-06 | 2021-11-02 | 中交隧道工程局有限公司 | Earth-rock geological foundation pit forming construction method |
| CN114215066A (en) * | 2021-11-24 | 2022-03-22 | 中国水利水电第九工程局有限公司 | Open cut foundation pit side wall collapse prevention excavation construction method |
| CN115030207A (en) * | 2022-07-06 | 2022-09-09 | 河南三建建设集团有限公司 | Construction method of steel caisson at bottom pit part of elevator shaft |
| CN115030207B (en) * | 2022-07-06 | 2024-05-03 | 河南三建建设集团有限公司 | Construction method of steel caisson at pit part of elevator |
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| CN106592601A (en) * | 2016-12-05 | 2017-04-26 | 中建六局土木工程有限公司 | Metro-adjacent complex geological environment supporting system construction method |
| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
| CN110847159A (en) * | 2019-11-28 | 2020-02-28 | 中铁十六局集团有限公司 | Construction process of in-hole mechanical pile for subway construction |
| CN111305225A (en) * | 2020-03-09 | 2020-06-19 | 中铁科建工程有限公司 | Engineering construction method of underground protective structure |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106592601A (en) * | 2016-12-05 | 2017-04-26 | 中建六局土木工程有限公司 | Metro-adjacent complex geological environment supporting system construction method |
| CN110093971A (en) * | 2019-04-26 | 2019-08-06 | 中铁第四勘察设计院集团有限公司 | The Combined water pump house and its construction method of subterranean tunnel |
| CN110847159A (en) * | 2019-11-28 | 2020-02-28 | 中铁十六局集团有限公司 | Construction process of in-hole mechanical pile for subway construction |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113585273A (en) * | 2021-08-06 | 2021-11-02 | 中交隧道工程局有限公司 | Earth-rock geological foundation pit forming construction method |
| CN114215066A (en) * | 2021-11-24 | 2022-03-22 | 中国水利水电第九工程局有限公司 | Open cut foundation pit side wall collapse prevention excavation construction method |
| CN114215066B (en) * | 2021-11-24 | 2023-09-22 | 中国水利水电第九工程局有限公司 | Collapse-prevention excavation construction method for side wall of open cut foundation pit |
| CN115030207A (en) * | 2022-07-06 | 2022-09-09 | 河南三建建设集团有限公司 | Construction method of steel caisson at bottom pit part of elevator shaft |
| CN115030207B (en) * | 2022-07-06 | 2024-05-03 | 河南三建建设集团有限公司 | Construction method of steel caisson at pit part of elevator |
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