CN112900430B - Cast-in-place pile casing in karst area and construction method of cast-in-place pile - Google Patents
Cast-in-place pile casing in karst area and construction method of cast-in-place pile Download PDFInfo
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- CN112900430B CN112900430B CN202110086188.6A CN202110086188A CN112900430B CN 112900430 B CN112900430 B CN 112900430B CN 202110086188 A CN202110086188 A CN 202110086188A CN 112900430 B CN112900430 B CN 112900430B
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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Abstract
The invention discloses a cast-in-place pile casing for karst areas and a construction method of a cast-in-place pile, wherein the casing comprises the following components: a casing body; and the elastic expansion sleeve is movably sleeved outside the pile casing body, two ends of the elastic expansion sleeve are respectively in sealing connection with the pile casing body, an expansion cavity is formed between the inner side wall of the elastic expansion sleeve and the outer side wall of the pile casing body, the pile casing body is provided with a pulp penetration hole, and the pulp penetration hole is communicated with the expansion cavity. The invention solves the problems of high cost, easy concrete leakage and high pile breaking risk of adopting the traditional cast-in-place pile for pile foundation construction in karst areas.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a cast-in-place pile casing for a karst area and a construction method of a cast-in-place pile.
Background
Cast-in-place bored piles and cast-in-place punched piles are common in pile foundation construction. In particular, in the process of pile foundation construction in a karst area, the pile foundation construction is generally carried out by adopting a punching cast-in-place pile construction process. The geological structure of the karst area is complex and changeable, the risk coefficient is high, and the complex geology of the karst area is generally dealt with by adopting the process of full casing following or backfilling filling materials at present. The construction cost of the full casing follow-up process is high, the back filling material consumption is greatly increased when the process faces an oversized karst cave, and concrete leakage is easy to occur in the process of pouring underwater concrete, so that the risk of pile breakage is increased.
Disclosure of Invention
In order to overcome the defects in the prior art, the karst area cast-in-place pile casing and the construction method of the cast-in-place pile are provided, so that the problems of high cost, easiness in concrete leakage and high pile breaking risk caused by the adoption of the traditional cast-in-place pile in the pile foundation construction in the karst area are solved.
In order to achieve the above object, there is provided a cast-in-place pile casing for karst areas, comprising:
a casing body; and
the elastic expansion sleeve is movably sleeved outside the pile casing body, two ends of the elastic expansion sleeve are respectively in sealing connection with the pile casing body, an expansion cavity is formed between the inner side wall of the elastic expansion sleeve and the outer side wall of the pile casing body, the pile casing body is provided with a pulp penetration hole, and the pulp penetration hole is communicated with the expansion cavity.
Furthermore, two ends of the elastic expansion sleeve are respectively hooped with a hoop.
Further, the elastic expansion sleeve is a rubber sleeve.
Further, the elastic expansion sleeve is an ethyl rubber sleeve.
Further, the casing body is a steel winding drum.
Furthermore, the number of the slurry permeating holes is multiple, and the slurry permeating holes are arranged at intervals along the circumferential direction of the casing body.
Furthermore, a check valve is arranged on the pulp penetration hole.
The invention provides a construction method of a cast-in-place pile in a karst area, which comprises the following steps:
determining the depth of a karst cave or poor geological layer in the geological layer of a pile hole of the cast-in-place pile based on geological exploration;
erecting a drilling machine at the position of the pile hole and drilling downwards to form a hole;
providing a karst region cast-in-place pile casing, and lowering the karst region cast-in-place pile casing after the drilling machine drills into and penetrates through the karst cave or the poor geological layer so that an elastic expansion sleeve of the karst region cast-in-place pile casing is aligned to the karst cave or the poor geological layer;
after the elastic expansion sleeve is aligned to the karst cave or the poor geological layer, replenishing grouting slurry in a casing body of the karst area grouting pile casing, wherein the slurry is grouted into the expansion cavity through a slurry penetration hole of the casing body, so that the elastic expansion sleeve is expanded to fill a gap in the karst cave or the poor geological layer;
and the drilling machine continues to drill downwards until the designed hole depth of the cast-in-place pile forms the pile hole, and concrete is poured into the pile hole to form the cast-in-place pile.
The karst area cast-in-place pile casing has the advantages that the elastic expansion sleeve expands after grouting to fill a karst cave or other gaps in a bad geological range, the pressure of slurry is abutted against the external underground water pressure to form mechanical balance, the leakage and collapse of the hole wall are prevented, and after underwater concrete is cast, as the specific gravity of the concrete is greater than that of the slurry, the slurry permeable hole is blocked by coarse aggregate in the concrete, and slurry backflow cannot occur. After the through-grouting hole is sealed, concrete leakage can be effectively prevented, the condition that pile breakage is caused after large-size leakage of concrete is prevented, and risks are reduced.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a casing of a cast-in-place pile in a karst region according to an embodiment of the invention.
Fig. 2 is a schematic view of a grout hole of a casing body according to an embodiment of the present invention.
Fig. 3 is a schematic view of a use state of a casing of a cast-in-place pile in a karst region according to an embodiment of the invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural view of a casing of a karst region cast-in-place pile according to an embodiment of the present invention, fig. 2 is a schematic view of a grout penetration hole of a casing body according to an embodiment of the present invention, and fig. 3 is a schematic view of a use state of the casing of the karst region cast-in-place pile according to an embodiment of the present invention.
Referring to fig. 1 to 3, the present invention provides a casing for a cast-in-place pile in a karst region, including: a casing body 1 and an elastic expansion sleeve 2.
Wherein, the elastic expansion sleeve 2 is movably sleeved outside the casing body 1. Two ends of the elastic expansion casing 2 are respectively connected with the casing body 1 in a sealing way. An expansion cavity is formed between the inner side wall of the elastic expansion sleeve and the outer side wall of the pile casing body. The side wall of the casing body 1 is provided with a slurry permeating hole 10, and the slurry permeating hole 10 is communicated with the expansion cavity.
As shown in fig. 3, the cavern 4 or other unfavorable geological structure is above the weakly weathered rock formation 5, the medium-coarse sand layer 6 is above the cavern 4 or other unfavorable geological structure, and the impurity backfill layer 7 is above the medium-coarse sand layer 6. When the cast-in-place pile is cast by adopting the cast-in-place pile casing in the karst area, the casing body is lowered into the weakly weathered rock stratum, so that the elastic expansion sleeve is aligned to the karst cave. After the elastic expansion casing pipe is aligned to the karst cave, the slurry is supplemented in the pile casing body, so that the height of the slurry in the pile casing body meets the construction requirement, the slurry is injected into the expansion cavity through the slurry penetration hole, the elastic expansion casing pipe is expanded in the karst cave to fill the gap in the karst cave, the pressure of the slurry is abutted against the pressure of the external underground water, mechanical balance is formed, and the leakage and the collapse of the hole wall are prevented.
After which the smaller bit is replaced and drilling continues down to the design hole depth. And then, preparing for underwater concrete pouring, placing a reinforcement cage after the preparation is ready, and pouring the underwater concrete, wherein in the process of pouring the underwater concrete, because the specific gravity of the concrete is greater than that of slurry, the thick aggregate in the concrete can block the slurry through holes, and the slurry can not flow back. After the through-grouting hole is sealed, concrete leakage can be effectively prevented, the condition that pile breakage is caused after large-size leakage of concrete is prevented, and risks are reduced.
The cast-in-place pile casing in the karst area is expanded after grouting through the elastic expansion casing pipe to fill a karst cave or other gaps in an unfavorable geological range, and the pressure of slurry is abutted against the pressure of external underground water to form mechanical balance so as to prevent the leakage and collapse of a hole wall. After the through-grouting hole is sealed, concrete leakage can be effectively prevented, the condition that pile breakage is caused after large-size leakage of concrete is prevented, and risks and construction cost are reduced.
In the present embodiment, the casing body 1 is a steel drum. The steel drum is formed by quantitatively welding steel coil materials. The inner diameter of the pile casing body 1 is 200mm larger than the pile diameter of the cast-in-place pile, the length is 3m larger than the net depth of the karst cave 4, and the thickness is 0.5mm. After the pile casing body is lowered, the lower end of the pile casing body is inserted into the weakly weathered rock stratum below the karst cave.
The number of the slurry permeating holes of the casing body 1 is multiple. The plurality of grout permeating holes are arranged at intervals along the circumferential direction of the casing body 1.
In some embodiments, the grout-permeable hole of the casing body 1 is provided with a check valve. Specifically, the grout hole has a first end distal from the expansion cavity and a second end proximal to the expansion cavity. The check valve is arranged at the second end of the grout penetration hole. The size of the check valve is matched with the inner diameter of the grout penetration hole. The first side of the check valve is hinged to the first side of the second end of the pulp penetration hole. And a pressing and abutting flange plate used for abutting against the end face of the second end of the slurry penetrating hole is formed on the second side of the check valve, so that slurry in the expansion cavity is prevented from flowing back to the casing body.
In a preferred embodiment, the elastic expansion sleeve 2 is a rubber sleeve. In the present embodiment, the elastic expansion sleeve 2 is an ethyl rubber sleeve.
The two ends of the elastic expansion casing 2 are respectively hooped with a hoop 3.
The invention provides a construction method of a cast-in-place pile in a karst area, which comprises the following steps:
s1: based on the geological exploration, the depth of the caverns 4 or other poor geological formations in the geological formation of the pile bore of the cast-in-place pile is determined.
S1: and erecting a drilling machine at the position of the pile hole and drilling the hole downwards.
S2: the method comprises the steps of providing a karst area cast-in-place pile casing, lowering the karst area cast-in-place pile casing after a drilling machine drills into and penetrates through a karst cave 4 or other unfavorable geological layers, enabling an elastic expansion sleeve 2 of the karst area cast-in-place pile casing to be aligned to the karst cave 4 or other unfavorable geological layers, and enabling the lower end of a casing body of the karst area cast-in-place pile casing to be inserted into the geological layers below the karst cave 4 or other unfavorable geological layers. In this embodiment, the geological formation beneath the cavern 4 or other poor geological formation is a weakly weathered formation.
S3: after the elastic expansion casing 2 is aligned to the karst cave 4 or other unfavorable geological layers, grouting slurry is supplemented in the casing body 1 of the cast-in-place pile casing in the karst region, and the slurry is poured into the expansion cavity through the slurry penetration holes of the casing body 1, so that the expansion cavity is expanded to fill gaps in the karst cave 4 or other unfavorable geological layers.
S4: and the drilling machine continues to drill downwards until the designed hole depth of the cast-in-place pile forms a pile hole, and concrete is poured into the pile hole to form the cast-in-place pile.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. A construction method of a cast-in-place pile in a karst area is characterized by comprising the following steps:
determining the depth of a karst cave or poor geological layer in the geological layer of a pile hole of the cast-in-place pile based on geological exploration;
erecting a drilling machine at the position of the pile hole and drilling a hole downwards;
providing a karst area cast-in-place pile casing, wherein the karst area cast-in-place pile casing comprises a casing body; the elastic expansion casing is movably sleeved outside the casing body, two ends of the elastic expansion casing are respectively connected to the casing body in a sealing mode, an expansion cavity is formed between the inner side wall of the elastic expansion casing and the outer side wall of the casing body, the casing body is provided with a slurry penetration hole, the slurry penetration hole is communicated with the expansion cavity, and after the drilling machine drills into and penetrates through the karst cave or the poor geological layer, the karst region cast-in-place pile casing is placed downwards, so that the elastic expansion casing of the karst region cast-in-place pile casing is aligned to the karst cave or the poor geological layer;
after the elastic expansion sleeve is aligned to the karst cave or the poor geological layer, replenishing grouting slurry in a casing body of the karst area grouting pile casing, wherein the slurry is grouted into the expansion cavity through a slurry penetration hole of the casing body, so that the elastic expansion sleeve is expanded to fill a gap in the karst cave or the poor geological layer;
and the drilling machine continues to drill downwards until the designed hole depth of the cast-in-place pile forms the pile hole, and concrete is poured into the pile hole to form the cast-in-place pile.
2. The construction method according to claim 1, wherein the two ends of the elastic expansion sleeve are respectively provided with a hoop.
3. Construction method according to claim 1, wherein said elastic expansion sleeve is a rubber sleeve.
4. A method of construction according to claim 3 wherein the elastomeric expandable sleeve is an ethyl rubber sleeve.
5. The construction method according to claim 1, wherein the casing body is a steel drum.
6. The construction method according to claim 5, wherein the number of the grout penetration holes is plural, and the plural grout penetration holes are arranged at intervals in a circumferential direction of the casing body.
7. The construction method according to claim 1, wherein the grout penetration hole is provided with a check valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110086188.6A CN112900430B (en) | 2021-01-22 | 2021-01-22 | Cast-in-place pile casing in karst area and construction method of cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110086188.6A CN112900430B (en) | 2021-01-22 | 2021-01-22 | Cast-in-place pile casing in karst area and construction method of cast-in-place pile |
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| CN112900430B true CN112900430B (en) | 2023-03-28 |
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| CN115142409A (en) * | 2022-06-20 | 2022-10-04 | 中国建筑第八工程局有限公司 | Pile foundation pore-forming slurry leakage repairing device and construction method thereof |
| CN115679955B (en) * | 2022-10-09 | 2024-06-04 | 重庆大学 | Construction device and construction method for pile foundation in solution cavity |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820732A (en) * | 2019-10-31 | 2020-02-21 | 广西大学 | Cast-in-situ bored pile suitable for karst area with connectivity channel and pile forming method |
| CN111827275A (en) * | 2020-08-21 | 2020-10-27 | 安徽省路桥工程集团有限责任公司 | Karst area pile foundation construction system and construction method |
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| KR101236765B1 (en) * | 2011-12-15 | 2013-02-25 | (주)삼일이엔씨 | Method for placing adhesive filling into the expanded drill hole to increase bearing capacity of piles and tention members and apparatus therefor |
| CN104674780A (en) * | 2015-02-06 | 2015-06-03 | 中鼎国际工程有限责任公司 | Karst stratum stabilization structure |
| CN105926658B (en) * | 2016-05-10 | 2019-02-05 | 中国科学院武汉岩土力学研究所 | The bellows note of large volume karst pile foundation construction fills fill method and structure |
| CN108755694B (en) * | 2018-06-13 | 2024-02-23 | 徐州中矿岩土技术股份有限公司 | Slurry stopper and full-hole grouting method for multiple karst caves |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820732A (en) * | 2019-10-31 | 2020-02-21 | 广西大学 | Cast-in-situ bored pile suitable for karst area with connectivity channel and pile forming method |
| CN111827275A (en) * | 2020-08-21 | 2020-10-27 | 安徽省路桥工程集团有限责任公司 | Karst area pile foundation construction system and construction method |
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