CN109555148B - Karst foundation treatment method for crossing larger solution cavity and combined pile plate structure thereof - Google Patents
Karst foundation treatment method for crossing larger solution cavity and combined pile plate structure thereof Download PDFInfo
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- CN109555148B CN109555148B CN201811610347.2A CN201811610347A CN109555148B CN 109555148 B CN109555148 B CN 109555148B CN 201811610347 A CN201811610347 A CN 201811610347A CN 109555148 B CN109555148 B CN 109555148B
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- reinforced concrete
- pile
- karst cave
- slab
- karst
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 128
- 238000005553 drilling Methods 0.000 claims description 6
- 238000011835 investigation Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012954 risk control Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
-
- 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
Abstract
The invention relates to a karst foundation treatment method for crossing a larger solution cavity and a combined pile plate structure thereof. The invention adopts the engineering structure composed of reinforced concrete members to process and span the larger solution cavity, thereby avoiding the problems of too long construction period and increased safety risk caused by too long pile length of the small-span pile plate structure and overcoming the defects of increased safety risk and slow construction progress caused by too deep pile length.
Description
Technical Field
The invention belongs to the technical field of traffic construction, and particularly relates to a method for treating karst foundations to span a larger solution cavity and a combined pile plate structure thereof.
Background
The karst subsidence area is widely distributed in railways, the trend of karst cavities is complex, and when pile plate structures are adopted to span the karst cavities, pile foundations are difficult to avoid not crossing the karst cavities. When the pile foundation is positioned in the solution cavity and the solution cavity is larger and more beaded, the pile foundation needs to go deep into the bottom of the solution cavity to be not less than 2 times of the pile diameter according to the existing standard. This will tend to cause the pile foundation to be very deep, the deeper the pile foundation, the more difficult the mechanical drilling and manual hole digging will be, and the mechanical drilling falls frequently, and the manual excavation has to step on the sky, and the workman falls into the cavity dangerous, and the manual excavation still needs ventilation, and the hole digging degree of depth is too dark slag tap slowly, leads to required man-hour and cost multiple increase. These factors seriously affect the construction progress and safety risk control of the railway, and a method is urgently needed to solve the problems.
Disclosure of Invention
The invention aims to provide a method for treating karst foundation to span a larger solution cavity and a combined pile plate structure thereof, so as to solve the problems of increased safety risk and slow construction progress caused by too deep pile length.
The technical scheme adopted by the invention is as follows:
the method for treating the karst foundation to cross the larger solution cavity is characterized by comprising the following steps of:
the method is realized by the following steps:
step one: cutting is excavated to the bottom surface of the reinforced concrete slab;
step two: arranging investigation and drilling holes one by one according to the designed pile positions, and finding out the distribution range of karst cave;
step three: according to the karst cave distribution range, pile holes of reinforced concrete piles are reasonably arranged, the reinforced concrete piles avoid larger karst cave cavities, reinforced concrete arch plates are used as reinforced concrete plates to span the larger karst cave cavities, and reinforced concrete flat plates are used as reinforced concrete plates to span small karst cave cavities;
step four: laying reinforced concrete piles;
step five: designing the length of a reinforced concrete pile, wherein the reinforced concrete pile is placed below a cavity bottom plate of a karst cave to a depth which is not less than 2 times of the pile diameter;
step six: constructing a reinforced concrete arch plate and a reinforced concrete flat plate;
step seven: filling up the reinforced concrete arch slab and the roadbed above the reinforced concrete slab.
The span length of the reinforced concrete arch slab of the larger karst cave cavity is 7-35m, and the span length of the reinforced concrete slab of the small karst cave cavity is not more than 7m.
In the fourth step:
transverse to the line: 3 groups of reinforced concrete piles are arranged on the reinforced concrete arch plate section, 1 group is arranged in the center of the roadbed, 1 group is respectively arranged along the left side and the right side of the center by 5.5m, and each group is arranged according to a triangle shape or a Chinese character 'ri'; 3 reinforced concrete piles are arranged on the reinforced concrete slab section, 1 pile is arranged in the center of the roadbed, 1 pile is arranged along 5.5m of the left side and the right side of the center, and the piles are arranged according to a shape of a Chinese character 'Tian';
along the longitudinal direction of the line: the reinforced concrete piles of the reinforced concrete arch plate sections are distributed according to the actual arrangement span; the reinforced concrete slab sections are distributed according to the interval of 7m.
The reinforced concrete pile foundation of the reinforced concrete arch slab section is selected from the karst cave cavity top without karst cave cavity or roof safety at the bottom.
And the reinforced concrete arch slab and the reinforced concrete pile, and the reinforced concrete slab and the reinforced concrete pile are integrally poured.
Karst foundation treatment spans the combination stake plate structure in great solution chamber, its characterized in that:
the reinforced concrete arch slab comprises a reinforced concrete arch slab section which spans a large karst cave cavity and a reinforced concrete slab section which spans a small karst cave cavity;
the reinforced concrete arch slab section comprises reinforced concrete piles and reinforced concrete arch slabs which are poured in an integral way;
the reinforced concrete slab section comprises a reinforced concrete pile and a reinforced concrete slab which are cast in a whole.
The span length of the reinforced concrete arch slab of the larger karst cave cavity is 7-35m, and the span length of the reinforced concrete slab of the small karst cave cavity is not more than 7m.
Transverse to the line: 3 groups of reinforced concrete piles are arranged on the reinforced concrete arch plate section, 1 group is arranged in the center of the roadbed, 1 group is respectively arranged along the left side and the right side of the center by 5.5m, and each group is arranged according to a triangle shape or a Chinese character 'ri'; 3 reinforced concrete piles are arranged on the reinforced concrete slab section, 1 pile is arranged in the center of the roadbed, 1 pile is arranged along 5.5m of the left side and the right side of the center, and the piles are arranged according to a shape of a Chinese character 'Tian';
along the longitudinal direction of the line: the reinforced concrete piles of the reinforced concrete arch plate sections are distributed according to the actual arrangement span; the reinforced concrete slab sections are distributed according to the interval of 7m.
The invention has the following advantages:
the invention adopts the engineering structure composed of reinforced concrete members to process and span the larger solution cavity, thereby avoiding the problems of too long construction period and increased safety risk caused by too long pile length of the small-span pile plate structure.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a plate structure across a larger solution chamber.
Figure 2 is a longitudinal cross-sectional view of the arch bar structure across a larger solution cavity.
Fig. 3 is a plan view of the arch bar structure across a larger solution cavity reinforced concrete pile arrangement.
In the figure, 1-reinforced concrete piles, 2-reinforced concrete arch plates, 3-reinforced concrete flat plates and 4-karst cave cavities.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a method for treating karst foundation to cross larger solution cavity, which is realized by the following steps:
step one: and excavating cutting to the bottom surface of the reinforced concrete slab.
Step two: and (5) arranging investigation and drilling holes pile by pile according to the designed pile positions, and finding out the karst cave distribution range.
Step three: according to the karst cave distribution range, pile holes of the reinforced concrete piles 1 are reasonably arranged, the reinforced concrete piles 1 avoid the large karst cave cavities 4, the reinforced concrete arch plates 2 serve as reinforced concrete plates to span the large karst cave cavities 4, and the reinforced concrete flat plates 3 serve as reinforced concrete plates to span the small karst cave cavities 4. The span length of the reinforced concrete arch slab 2 of the large karst cave cavity 4 is 7-35m, and the span length of the reinforced concrete slab 3 of the small karst cave cavity 4 is not more than 7m.
Step four: laying reinforced concrete piles 1;
transverse to the line: the reinforced concrete arch plate 2 is provided with 3 groups of reinforced concrete piles 1, the center of the roadbed is provided with 1 group, the left side and the right side of the center are respectively provided with 1 group along 5.5m, and each group is arranged according to a triangle or a Chinese character 'ri'; 3 reinforced concrete piles 1 are arranged on the 3 sections of reinforced concrete flat plates, 1 pile is arranged in the center of the roadbed, 1 pile is arranged along 5.5m of the left side and the right side of the center, and the piles are arranged according to a shape of a Chinese character 'Tian';
along the longitudinal direction of the line: the reinforced concrete piles 1 of the reinforced concrete arch plate 2 sections are distributed according to the actual arrangement span; the 3 sections of the reinforced concrete slab are distributed according to the interval of 7m.
Step five: designing the length of a reinforced concrete pile 1, wherein the reinforced concrete pile 1 is arranged below a bottom plate (referred to as a solid part at the bottom of a karst cave cavity) 4 of the karst cave and is not less than 2 times of the pile diameter; the length of the reinforced concrete pile 1 of the reinforced concrete arch plate 2 section is more than 20m, and the length of the reinforced concrete pile 1 of the reinforced concrete slab 3 section is less than 20 m. The pile foundation of the reinforced concrete pile 1 in the section of the reinforced concrete arch plate 2 is selected and arranged at the top of the karst cave cavity 4 with no karst cave cavity 4 at the bottom or a safe roof (refer to a solid part above the karst cave cavity). The reinforced concrete arch plate 2 and the reinforced concrete pile 1, and the reinforced concrete slab 3 and the reinforced concrete pile 1 are integrally cast.
Step six: constructing a reinforced concrete arch plate 2 and a reinforced concrete flat plate 3;
step seven: and filling the roadbed above the reinforced concrete arch slab 2 and the reinforced concrete slab 3.
Examples:
the construction of the karst roadbed foundation treatment from Qian Zhang Chang Tielu DK159+945 to DK160+048 adopts a reinforced concrete pile plate structure to span the cavity of the karst cave as shown in figure 1. As shown in fig. 2, the method for changing the arch slab and the flat slab of the reinforced concrete pile to span the cavity of the karst cave is realized by the following steps:
step one: and excavating cutting to the bottom surface of the reinforced concrete slab.
Step two: and (5) arranging investigation and drilling holes one by one according to the original design pile positions, and finding out the karst cave distribution range.
Step three: according to karst cave distribution range, the unstable foundation is treated, pile holes are reasonably arranged, the pile foundation avoids larger dissolving cavities, large-span arch plates span the larger dissolving cavities, and small-span flat plates span the small dissolving cavities.
Step four: and laying reinforced concrete piles. As shown in fig. 3, 3 transverse reinforced concrete piles are arranged along the line, 1 road bed is arranged in the center, and 1 road bed is arranged along 5.5m left and right sides of the center. As shown in fig. 3, in the longitudinal direction of the line, the reinforced concrete pile arch slab sections are arranged according to the actual arrangement span, and the slab sections are arranged according to the interval of 7m.
Step five: the length of the reinforced concrete pile is designed, and the reinforced concrete pile is placed below the unsafe cavity bottom plate to a depth which is not less than 2 times of the pile diameter. And constructing the reinforced concrete pile 1 and detecting the pile foundation according to the standard requirements.
Step six: and (5) designing reinforced concrete arch slabs and flat plates, and constructing reinforced concrete slabs.
Step seven: filling the roadbed above the reinforced concrete slab.
The invention processes karst foundation treatment to span a large karst cavity, adopts a reinforced concrete arch plate method to span the large karst cavity, and avoids the problems of too long construction period and increased safety risk caused by too long pile length of a small-span pile plate structure.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (3)
1. The method for treating the karst foundation to cross the larger solution cavity is characterized by comprising the following steps of:
the method is realized by the following steps:
step one: cutting is excavated to the bottom surface of the reinforced concrete slab;
step two: arranging investigation and drilling holes one by one according to the designed pile positions, and finding out the distribution range of karst cave;
step three: according to the karst cave distribution range, pile holes of the reinforced concrete piles (1) are reasonably arranged, the reinforced concrete piles (1) avoid larger karst cave cavities (4), the reinforced concrete arch plates (2) are used as reinforced concrete plates to span the larger karst cave cavities (4), and the reinforced concrete flat plates (3) are used as reinforced concrete plates to span the small karst cave cavities (4);
step four: laying reinforced concrete piles (1);
step five: designing the length of a reinforced concrete pile (1), wherein the reinforced concrete pile (1) is arranged below the bottom plate of the karst cave cavity (4) to a depth which is not less than 2 times of the pile diameter;
step six: constructing a reinforced concrete arch plate (2) and a reinforced concrete flat plate (3);
step seven: filling the roadbed above the reinforced concrete arch slab (2) and the reinforced concrete flat slab (3);
in the fourth step:
transverse to the line: 3 groups of reinforced concrete piles (1) are arranged on the section of the reinforced concrete arch plate (2), 1 group is arranged in the center of the roadbed, 1 group is arranged along 5.5m respectively on the left side and the right side of the center, and each group is arranged according to a triangle shape or a Chinese character 'ri'; 3 reinforced concrete piles (1) are arranged on the section of the reinforced concrete slab (3), 1 pile is arranged in the center of the roadbed, 1 pile is arranged along 5.5m on the left side and the right side of the center, and the pile is arranged according to a Chinese character 'tian' shape;
along the longitudinal direction of the line: the reinforced concrete piles (1) of the reinforced concrete arch plate (2) are distributed according to the actual arrangement span; the segments of the reinforced concrete slab (3) are distributed according to the interval of 7 m;
pile foundations of the reinforced concrete piles (1) of the reinforced concrete arch plates (2) are selected to be arranged at the tops of karst cave cavities (4) with no karst cave cavities (4) at the bottoms or safe roof plates.
2. The method of karst foundation treatment across a larger solution cavity of claim 1, wherein:
the span length of the reinforced concrete arch slab (2) of the larger karst cave cavity (4) is 7-35m, and the span length of the reinforced concrete slab (3) of the small karst cave cavity (4) is not more than 7m.
3. The method of karst foundation treatment across a larger solution cavity of claim 1, wherein:
the reinforced concrete arch plate (2) and the reinforced concrete pile (1), and the reinforced concrete flat plate (3) and the reinforced concrete pile (1) are integrally poured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610347.2A CN109555148B (en) | 2018-12-27 | 2018-12-27 | Karst foundation treatment method for crossing larger solution cavity and combined pile plate structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811610347.2A CN109555148B (en) | 2018-12-27 | 2018-12-27 | Karst foundation treatment method for crossing larger solution cavity and combined pile plate structure thereof |
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| Publication Number | Publication Date |
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| CN109555148A CN109555148A (en) | 2019-04-02 |
| CN109555148B true CN109555148B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111395060B (en) * | 2020-03-24 | 2021-06-18 | 中铁二院工程集团有限责任公司 | Design and construction method for widening roadbed structure of existing cutting in karst area |
| CN114892632A (en) * | 2022-05-18 | 2022-08-12 | 中建路桥集团有限公司 | Device for constructing shallow karst cave with large span and large range in road construction and construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206396566U (en) * | 2016-11-02 | 2017-08-11 | 中铁第一勘察设计院集团有限公司 | A kind of U-shaped embankment structure of pile of the anti-ground collapse in karst area |
| CN107460791A (en) * | 2017-08-25 | 2017-12-12 | 中铁第勘察设计院集团有限公司 | Railway karst ground treatment Antipollution method and structure near I grade of potable water source district |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741672B (en) * | 2014-01-24 | 2016-01-13 | 俞向阳 | A kind of pre-tensioning system centrifugal concrete pile and manufacture method with steel strand |
| CN209669910U (en) * | 2018-12-27 | 2019-11-22 | 中铁第一勘察设计院集团有限公司 | A kind of karst ground treatment crosses over the combination pile slab structure of larger molten chamber |
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- 2018-12-27 CN CN201811610347.2A patent/CN109555148B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206396566U (en) * | 2016-11-02 | 2017-08-11 | 中铁第一勘察设计院集团有限公司 | A kind of U-shaped embankment structure of pile of the anti-ground collapse in karst area |
| CN107460791A (en) * | 2017-08-25 | 2017-12-12 | 中铁第勘察设计院集团有限公司 | Railway karst ground treatment Antipollution method and structure near I grade of potable water source district |
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