CN108755698B - Construction method for steep slope loose accumulation body large inclined rock surface foundation - Google Patents
Construction method for steep slope loose accumulation body large inclined rock surface foundation Download PDFInfo
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- CN108755698B CN108755698B CN201810518715.4A CN201810518715A CN108755698B CN 108755698 B CN108755698 B CN 108755698B CN 201810518715 A CN201810518715 A CN 201810518715A CN 108755698 B CN108755698 B CN 108755698B
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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Abstract
The invention discloses a construction method of a steep slope loose accumulation body large inclined rock surface foundation, which is characterized by comprising the following steps: the construction method comprises the following steps in sequence: the construction method comprises the steps of firstly excavating loose accumulation bodies in a bridge foundation construction site range, arranging a buffer platform, excavating parts of large inclined rock faces higher than a bearing platform bottom standard in the bearing platform range to a bearing platform bottom elevation, excavating parts of the large inclined rock faces lower than the bearing platform bottom standard in the bearing platform range to form steps, constructing a retaining wall at the slope toe of a steep slope loose accumulation body to the bearing platform bottom elevation, backfilling soil on the excavated steps in a layering mode, synchronously embedding pile foundation steel protective cylinders, filling the pile foundation steel protective cylinders to the buffer platform elevation all the time to form a construction platform, installing a gantry crane and a drilling machine, carrying out bridge foundation construction, wherein the bridge foundation construction comprises the construction of a pile foundation, excavating to the bearing platform bottom elevation after the construction of the pile foundation is finished, clearing pile heads, and finally constructing the bearing platform.
Description
Technical Field
The invention relates to the technical field of bridge foundation construction, in particular to a construction method of a steep slope loose accumulation body large-inclined rock surface foundation.
Background
The foundation construction business of China is vigorously developed and is known as ' basic construction magic ', particularly, the bridge engineering achieves splendid achievements, and high, large, difficult, fine, sharp and special ' bridges can be built under various complex conditions. Some bridges across large rivers have unfavorable environments that the bridge sites are sometimes built on steep slope loose accumulation body large inclined rock surfaces due to condition limitation. In the bridge foundation construction under such conditions, firstly, a loose accumulation body is treated and a bridge foundation construction platform is provided. Usually, a method of removing loose accumulation bodies and then erecting a steel platform is adopted, but the method is difficult to construct under the condition of a steep slope due to site limitation, and the steel pipe pile foundation and the steel casing are difficult to accurately position and drive under the condition of a large-inclined rock surface, so that the comprehensive cost is very high. If the construction method of excavating the platform after stabilizing the loose accumulation body by steel perforated pipe grouting is adopted, the grouting amount is large, the grouting period is long, the grouting effect is difficult to control, the load of the loose accumulation body is increased, the adverse risk is increased, and the excavation difficulty is large after grouting. There is therefore a need for a method that solves the above problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the construction method of the steep slope loose accumulation body large inclined rock face foundation, which is simple and convenient to construct and can ensure that bridge foundation construction is safely and efficiently carried out.
The technical solution of the invention is as follows: a construction method of a steep slope loose accumulation body large inclined rock surface foundation is characterized by comprising the following steps: the construction method comprises the following steps in sequence:
a. firstly, excavating and removing loose accumulation bodies 1 in the range of a bridge foundation construction site, arranging a buffer platform 3, excavating the part of a large inclined rock surface 2 which is higher than the elevation 4 of the bottom of a bearing platform in the range of the bearing platform 12 to the elevation 4 of the bottom of the bearing platform,
b. excavating the part of the large inclined rock surface 2 which is lower than the elevation 4 of the bearing platform bottom in the range of the bearing platform 12 into a step 5,
c. constructing a retaining wall 6 at the slope foot of the abrupt slope loose accumulation body 1 to the bottom elevation 4 of the bearing platform,
e. installing a gantry crane 9 and a drilling machine 10,
f. and (3) carrying out bridge foundation construction, wherein the bridge foundation construction comprises the construction of the pile foundation 11, after the construction of the pile foundation 11 is finished, excavating to the bottom elevation 4 of the bearing platform, removing the pile head, and finally carrying out the construction of the bearing platform 12.
In the step a, the elevation of the buffer platform 3 is 2-3 meters higher than the elevation of the bottom of the bearing platform by 4 meters.
In the step b, the width of the step 5 is equal to the distance between the adjacent pile foundations 11.
In the step c, the retaining wall 6 is a gantry crane 9 track foundation.
In the step d, 2% of cross slopes are arranged on the whole construction platform.
Compared with the prior art, the invention has the following advantages:
the construction method provided by the invention at least has the following beneficial effects:
1. the loose accumulation bodies are cleaned, the safe construction of the bridge foundation under the condition of stable geology can be ensured, the cost is reduced compared with a grouting reinforcement method, and the construction period is shortened.
2. The step is excavated, the soil is backfilled in layers, and the pile foundation steel casing is embedded synchronously, so that the problem that the steel casing is difficult to embed under the condition of a large inclined rock surface can be solved, the bench work cost of the piling equipment is saved, and the operation is simple and convenient.
3. The constructed retaining wall not only can play a role of supporting and blocking, but also can be used as a portal crane track foundation. The gantry crane is used for carrying out foundation construction on the large bridge, so that the bench cost of the hoisting equipment is effectively reduced, and the space of a construction site is saved.
The method is used for constructing the geological environment of the large-inclined rock face of the loose accumulation body of the steep slope, a construction platform can be provided for a bridge foundation on the steep slope, and the bridge foundation construction can be better organized.
Drawings
FIG. 1 is a schematic view of a bridge foundation facade using the construction method of the present invention.
FIG. 2 is a schematic view of step a in the construction method of the present invention.
FIG. 3 is a schematic view of step b in the construction method of the present invention.
FIG. 4 is a schematic view of step c of the construction method of the present invention.
FIG. 5 is a schematic view of step d in the construction method of the present invention.
FIG. 6 is a schematic view of step e of the construction method of the present invention.
FIG. 7 is a schematic view of step f of the construction method of the present invention.
Detailed Description
The following description will explain embodiments of the present invention with reference to the accompanying drawings. As shown in fig. 1 to 7: a construction method for a steep slope loose accumulation body large inclined rock surface foundation comprises the following steps in sequence:
a. firstly, excavating and removing loose accumulation bodies 1 in a bridge foundation construction site range, continuously excavating a large inclined rock face 2, and arranging a buffer platform 3 at a position 2-3 meters above the bottom elevation 4 of a bearing platform. The buffer platform 3 can reduce the risk that the upper loose accumulation body 1 slides downwards to impact the bridge foundation construction site, reduce the total clearing amount and be used as a gantry crane 9 track foundation for bridge foundation construction. Continuously excavating the part higher than the bearing platform bottom elevation 4 within the range of the bearing platform 12 to the bearing platform bottom elevation 4,
b. excavating the part of the large inclined rock surface 2 which is lower than the bearing platform bottom elevation 4 within the range of the bearing platform 12 into a step 5, wherein the width of the step 5 is equal to the distance between adjacent pile foundations 11, so that the step is convenient to accurately position and embed when the steel pile casing 8 is constructed subsequently,
c. constructing a retaining wall 6 at the slope foot of the loose accumulation body 1 of the steep slope to the bottom elevation 4 of the bearing platform, wherein the retaining wall 6 has the main function of supporting and retaining the whole construction platform and has the auxiliary function that the top surface can be used as another track foundation of the gantry crane 9,
d. the excavated step 5 is layered with backfill 7, a pile foundation steel casing 8 is synchronously embedded, and the backfill is carried out until the elevation of the buffer platform 3 to form a construction platform, the construction platform is integrally provided with a 2 percent cross slope which is beneficial to water drainage, and pipeline lines such as slurry, water delivery and the like are embedded in the backfill to be beneficial to civilized construction of the construction platform,
e. installing a gantry crane 9 and a drilling machine 10,
f. and (3) carrying out bridge foundation construction, wherein the bridge foundation construction comprises the construction of the pile foundation 11, after the construction of the pile foundation 11 is finished, excavating to the bottom elevation 4 of the bearing platform, removing the pile head, and finally carrying out the construction of the bearing platform 12.
Claims (4)
1. A construction method of a steep slope loose accumulation body large inclined rock surface foundation is characterized by comprising the following steps: the construction method comprises the following steps in sequence:
a. firstly, excavating and removing loose accumulation bodies (1) in the range of a bridge foundation construction site, continuously excavating a large inclined rock face (2) to a position 2-3 meters above the elevation (4) of the bottom of a bearing platform, arranging a buffer platform 3, excavating the part of the large inclined rock face (2) higher than the elevation (4) of the bottom of the bearing platform in the range of the bearing platform (12) to the elevation (4) of the bottom of the bearing platform,
b. excavating the part of the large inclined rock surface (2) which is lower than the bearing platform bottom elevation (4) in the range of the bearing platform (12) into a step (5),
c. constructing a retaining wall (6) at the slope foot of the abrupt slope loose accumulation body (1) to the bottom elevation (4) of the bearing platform,
d. backfilling soil (7) on the excavated step (5) in a layered manner, synchronously embedding pile foundation steel casing barrels (8), and filling until the height of the buffer platform (3) is raised to form a construction platform,
e. a gantry crane (9) and a drilling machine (10) are installed,
f. and (3) carrying out bridge foundation construction, wherein the bridge foundation construction comprises the construction of a pile foundation (11), after the construction of the pile foundation (11) is finished, excavating to the elevation (4) of the bottom of the bearing platform, removing a pile head, and finally carrying out the construction of the bearing platform (12).
2. The construction method of the steep slope loose accumulation body large inclined rock surface foundation according to claim 1, characterized in that: in the step b, the width of the step (5) is equal to the distance between the adjacent pile foundations (11).
3. The construction method of the steep slope loose accumulation body large inclined rock surface foundation according to claim 1, characterized in that: in the step c, the retaining wall (6) can be used as a track foundation of a gantry crane (9).
4. The construction method of the steep slope loose accumulation body large inclined rock surface foundation according to claim 1, characterized in that: in the step d, 2% of cross slopes are arranged on the whole construction platform.
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| CN201810518715.4A CN108755698B (en) | 2018-05-25 | 2018-05-25 | Construction method for steep slope loose accumulation body large inclined rock surface foundation |
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| CN201810518715.4A CN108755698B (en) | 2018-05-25 | 2018-05-25 | Construction method for steep slope loose accumulation body large inclined rock surface foundation |
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| CN108755698A CN108755698A (en) | 2018-11-06 |
| CN108755698B true CN108755698B (en) | 2020-01-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111108995B (en) * | 2020-01-07 | 2022-03-08 | 厦门市宏展工程建设有限公司 | Slope landscape construction method for landscape mountain |
| CN111622669B (en) * | 2020-05-22 | 2021-08-10 | 中铁大桥局集团第二工程有限公司 | Auxiliary drilling device for inclined rock surface and construction method thereof |
| CN111894023A (en) * | 2020-07-27 | 2020-11-06 | 中交路桥建设有限公司 | Construction method of steep-slope bridge foundation |
| CN112922298B (en) * | 2021-01-28 | 2022-07-12 | 中国建筑股份有限公司 | Construction platform, construction platform building method and construction engineering construction method |
| CN114351746B (en) * | 2021-11-25 | 2024-04-19 | 中国葛洲坝集团路桥工程有限公司 | Mountain area river-following steep bank slope pile foundation platform and construction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120081A (en) * | 1998-10-19 | 2000-04-25 | Kajima Corp | Slope footing structure |
| CN106368231A (en) * | 2016-10-08 | 2017-02-01 | 张献斌 | Construction method of road bridge pile foundation of mountain steep slope region |
| CN107841908A (en) * | 2017-11-30 | 2018-03-27 | 中铁第四勘察设计院集团有限公司 | For eliminating the road structure of the high embankment lateral variation sedimentation in high-speed railway abrupt slope |
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- 2018-05-25 CN CN201810518715.4A patent/CN108755698B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000120081A (en) * | 1998-10-19 | 2000-04-25 | Kajima Corp | Slope footing structure |
| CN106368231A (en) * | 2016-10-08 | 2017-02-01 | 张献斌 | Construction method of road bridge pile foundation of mountain steep slope region |
| CN107841908A (en) * | 2017-11-30 | 2018-03-27 | 中铁第四勘察设计院集团有限公司 | For eliminating the road structure of the high embankment lateral variation sedimentation in high-speed railway abrupt slope |
Non-Patent Citations (1)
| Title |
|---|
| "山区大陡坡桥梁高桩承台基础施工";华勇等;《中国港湾建设》;20160531;第36卷(第5期);第69-72页第0-5节 * |
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