CN211421112U - Double-casing pore-forming structure of karst geological pile foundation - Google Patents
Double-casing pore-forming structure of karst geological pile foundation Download PDFInfo
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- CN211421112U CN211421112U CN201921858109.3U CN201921858109U CN211421112U CN 211421112 U CN211421112 U CN 211421112U CN 201921858109 U CN201921858109 U CN 201921858109U CN 211421112 U CN211421112 U CN 211421112U
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Abstract
The utility model discloses two section of thick bamboo pore-forming structures that protect of rock-dissolving geological pile foundation, outer protecting cylinder sink and reach the surface soil layer bottom, and interior protecting cylinder is concentric with outer protecting cylinder, sinks to pass the rock-dissolving development layer, and the reinforced concrete pile foundation is pour in interior protecting cylinder, and the deepest gets into the rock base member. The structure can effectively prevent the accident of subsidence of the surface soil layer in the construction of the pile foundation of the karst geological casing, and the outer casing has positioning and centering on the inner casing, so that the deflection of the subsidence center line caused by uneven geology of the inner casing is prevented.
Description
Technical Field
The utility model relates to a bridge foundation pile construction structures specifically is a two section of thick bamboo pore-forming structures that protect of solution rock geological pile foundation.
Background
The pile casing is just in the process of manually digging the hole pile, and because soil quality is unstable, the hole pile is protected by adopting a wooden, steel or concrete cylindrical wall casing due to the great difficulty in constructing the reinforced concrete wall casing, so that hole collapse is prevented, and construction progress and safety are prevented from being influenced. The heat difference is poor in geological conditions, such as limestone and karst rock development geology, and pile foundation construction needs to be conducted through pile casing hole forming construction.
The construction of the traditional pile casing roughly comprises the following processes: and (3) placing the prefabricated pile casing at the pile position, applying pressure or hammering and vibrating to the pile casing, then clearing soil in the pile casing to enable the pile casing to smoothly sink, drilling to a preset depth along the interior of the pile casing after the pile casing sinks to a preset position, clearing holes, placing a reinforcement cage, and pouring concrete, namely completing foundation pile construction.
Some problems are often encountered at the construction site of the pile casing foundation in the karst geology: in the sinking process of the pile casing, the collapse and the sinking of the soft ground on the surface layer can be caused sometimes, so that the potential safety hazards of equipment and constructors are caused; on the other hand, in the construction process of deeper pile foundation depth, the pile casing is influenced by uneven karst geology, such as karst caves and the like, and can deviate from the central line in the sinking process, so that the final concrete pile foundation is not vertical; moreover, the outer wall of the steel pile casing is large in friction force of a soil layer, and in the later period, the descending resistance of the pile casing is large, so that the pile casing can be pressed down only by applying large pressure.
The searched published documents about the construction of the double casing pile foundation are as follows:
1. a section of thick bamboo is protected more convenient to karst cave development area bridge pile foundation construction, application number: CN 201320162748.2; the applicant: sichuan traffic bridge, Limited liability company; and (3) abstract: a section of thick bamboo is protected more convenient to karst cave development area bridge pile foundation construction, its characterized in that: the thickness of the steel plate of the pile casing is calculated by using a material mechanics formula, and according to the thickness of the required steel plate, a 1.8m wide A3 standard steel plate is selected to be rolled and welded into a section of steel pile casing, and 5-8 sections of steel pile casings are spliced into a group of steel pile casings; splicing multiple groups of steel casing into the designed depth of the bridge pile foundation; the length of the outer protective cylinder is the distribution depth of an underground karst cave or an underground river formed by splicing a plurality of groups of steel protective cylinders; the length of the outer two pile casings is that a geological structure formed by splicing a plurality of groups of steel pile casings is the depth of easy collapse of a soil layer, a rock stratum and sand gravel; when the double pile casings are constructed, the inner diameter of the inner pile casing is equal to the designed pile diameter of the bridge pile; the diameter of the outer pile casing needs to be 25-35cm larger than the designed pile diameter of the bridge pile. The technology can thoroughly solve the problem of serious excess of concrete caused by hole expansion in beam-pile construction in karst cave special development areas. The construction speed is scientifically accelerated and the engineering cost is effectively controlled on the premise of guaranteeing the engineering quality and the construction safety.
2. A construction method of a double pile casing of a large-diameter cast-in-situ bored pile; application No.: CN 201210507258.1; the applicant: tianjin, third municipal highway engineering Co., Ltd, abstract: a construction method for double pile casings of a large-diameter cast-in-situ bored pile comprises the following construction processes: 1. driving an outer protecting sleeve of the cast-in-place pile: manufacturing an outer protective cylinder, and driving the outer protective cylinder in place; 2. installing an inner protective sleeve of the cast-in-place pile: manufacturing an inner protective cylinder, and installing the inner protective cylinder at the top end of the outer protective cylinder; 3. backfilling: backfilling a gap between the inner protective cylinder and the outer protective cylinder to prevent the inner protective cylinder from displacing during drilling and prevent concrete from entering the gap during pouring; 4. and (3) construction of the cast-in-situ bored pile: after the inner and outer casing barrels are installed, the cast-in-situ bored pile is constructed in a conventional mode; 5. pulling out the inner protective barrel: after the cast-in-place bored pile concrete is poured, pulling out the inner casing before initial setting; 6. pulling out the outer protective sleeve: and when the concrete strength of the cast-in-place pile reaches 75% of the design strength, pulling out the outer protective sleeve to complete the construction of the large-diameter cast-in-place bored pile. The invention has the advantages of simple process, convenient construction, safety, reliability, stable quality, effective cost saving, high production efficiency and the like.
3. A deep sludge layer double pile foundation construction structure; application No.: CN 201821319852.7; the applicant: the Zhongjie fourth voyage office, first engineering company, Zhongjie fourth voyage office, third engineering company, fourth engineering company, Zhongjie engineering office, fourth engineering office, third engineering company, fourth engineering office, third engineering office, fourth; and (3) abstract: the utility model provides a two pile foundation construction structures that protect on deep silt layer, it runs through silt and powder muck layer and protects a section of thick bamboo outward that pulls out after concrete placement when the pile foundation pore-forming, set up in the dado protection flood peak pore-forming structure of outer protecting section of thick bamboo outer wall, set up in the inner protecting tube that can not pull out of outer protecting tube inner chamber, set up the plugging material between a lower extreme and outer protecting tube lower extreme including protecting tube, set up in the pile foundation steel reinforcement cage of inner protecting tube inner chamber and pour in the concrete of inner protecting tube inner chamber. The utility model discloses a double-deck section of thick bamboo that protects adopts as pile foundation pore-forming structure, can pull out, reuse's mode to the outer section of thick bamboo that the material requires height, with high costs, forms this lower interior section of thick bamboo of protecting and then participates in the stake, once only stands for the round pin, and interior, outer section of thick bamboo is isolated relatively and independent, protects a section of thick bamboo outward and can not influence the stake of one-tenth pile body when pulling out, has guaranteed the steadiness of stake, has reached the designing requirement, has practiced thrift the cost again greatly.
As can be known from published documents, the protection of the double casing pile foundation construction in the prior art against the collapse of the surface soil layer is not enough; the positioning and centering effect of the outer protective sleeve on the inner protective sleeve is also insufficient.
Disclosure of Invention
The utility model provides a double-casing pore-forming structure of a karst geological pile foundation; the structure can effectively prevent the accident of subsidence of the surface soil layer in the construction of the pile foundation of the karst geological casing, and the outer casing has positioning and centering on the inner casing, so that the deflection of the subsidence center line caused by uneven geology of the inner casing is prevented.
In order to achieve the purpose of the invention, the technical scheme is as follows:
two casings pore-forming structure that protect of karst geology pile foundation, outer casing sink and reach top layer geology bottom, and interior casing is concentric with outer casing, sinks to pass the karst development layer, and the reinforced concrete pile foundation is pour in inner casing, and the deepest gets into the rock base member.
Between outer protective barrel and the interior protective barrel, interior protective barrel upper border is higher than outer protective barrel upper border, and outer protective barrel upper border sets up a plurality of locating pieces, locating piece and interior protective barrel outer circumference sliding contact.
The periphery of the earth surface of the outer protective cylinder is a concrete hardened ground, and the upper plane of the hardened ground is lower than the upper edge of the outer protective cylinder.
The base of the positioning block is welded and fixed on the upper edge of the outer protective cylinder, and a plurality of longitudinal positioning ribs are welded on the base and are in sliding contact with the outer circumference of the inner protective cylinder.
The double-casing pore-forming construction comprises the following steps:
the first step is as follows: measuring and lofting, positioning, and sinking the outer protective cylinder by using a vibration hammer, wherein the sinking depth is that the outer protective cylinder penetrates through a soft soil layer on the earth surface and reaches the top of a karst development layer;
the second step is that: hardening the orifice ground around the outer protective cylinder by using concrete, wherein the top opening of the outer protective cylinder is higher than the upper surface of the hardened ground by more than 30 cm;
the third step: punching holes in the outer protective cylinder by using a pile machine, and gradually punching the holes downwards from the ground to the top of the karst development layer;
the fourth step: placing the inner protective cylinder into the hole, centering, and welding or mounting a positioning block; the inner protective cylinder is divided into a plurality of sections, and the sections are welded and lengthened one by one in the sinking process;
the fifth step: under the whole-course follow-up protection of the inner protecting cylinder, continuously punching, and timely sinking the inner protecting cylinder according to the footage, wherein the step distance is not more than 50 cm;
and a sixth step: punching until the final hole elevation of the foundation rock layer is reached, and cleaning the hole;
the seventh step: lowering a reinforcement cage, secondarily cleaning holes, pouring concrete, and combining the concrete and the inner protective cylinder into a whole to form a foundation pile;
eighth step: and backfilling the gap between the inner protective cylinder and the outer protective cylinder by using concrete or gravel soil and cobble soil.
The ninth step: and pulling out the outer protective sleeve.
Compared with the substantive characteristics and progress of the prior art, the utility model is:
1. the utility model discloses a two pile casing structure, pile casing divide into two steps and sink the construction, and the inner pile casing can not lead to the subsidence of surface soil layer through solution cavity geology rock stratum; the ground around the outer protective cylinder is hardened, so that the stable placement of construction equipment and the safety of personnel and equipment are ensured more effectively.
2. The double-pile casing structure in the utility model can prevent the situation that the pile casing deviates due to the influence of uneven karst cave geology on the sinking caused by the overlong pile casing structure; the sinking accuracy and the one-time success rate of the pile casing are improved; on the other hand, the arrangement of the positioning block prevents the inner protective cylinder and the outer protective cylinder from direct friction sliding, and the centering is more accurate.
3. The utility model discloses the setting of a section of thick bamboo is protected to china and foreign, has reduced interior protective barrel and has sunk the in-process, and the friction of outer wall and soil layer has reduced stake machine pressure loss, the energy cost can be saved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic structural view of the part above the earth's surface;
FIG. 3 is a schematic view of the positioning block according to the present invention;
FIG. 4 is a schematic sectional view of the present invention;
1. an outer protective cylinder; 2. an inner protective cylinder; 3. a reinforced concrete pile foundation; 4. positioning blocks; 5. hardening the ground; 6. and (4) cave filling.
Detailed Description
Example 1
The present invention will be described in further detail with reference to the accompanying drawings;
the dual-protection-barrel pore-forming structure of the karst geological pile foundation is characterized in that an outer protection barrel 1 sinks to the bottom of a surface soil layer, and the outer protection barrel 1 and an inner protection barrel 2 are formed by bending and welding 10mm thick steel plates;
the inner casing 2 is concentric with the outer casing 1, the distance from the inner wall of the outer casing 1 to the outer wall of the inner casing 2 is 10cm, the inner casing sinks to penetrate through a karst rock development layer, the reinforced concrete pile foundation 3 is poured in the inner casing 2, and the deepest part of the reinforced concrete pile foundation enters a rock substrate;
between the outer protective cylinder 1 and the inner protective cylinder 2, the upper edge of the inner protective cylinder 2 is higher than the upper edge of the outer protective cylinder 1, a plurality of positioning blocks 4 are arranged on the upper edge of the outer protective cylinder 1, and the positioning blocks 4 are in sliding contact with the outer circumference of the inner protective cylinder 2; the upper edge of the inner protective cylinder 2 is 20cm higher than the upper edge of the outer protective cylinder 1;
the periphery of the ground surface of the outer casing 1 is provided with a hardened ground 5, and the upper plane of the hardened ground 5 is 30cm lower than the upper edge of the outer casing 1;
the base 41 of the positioning block 4 is welded and fixed on the upper edge of the outer protective cylinder 1, and a plurality of longitudinal positioning ribs 42 are welded on the base 41 and are in sliding contact with the outer circumference of the inner protective cylinder 2.
Claims (4)
1. Two casings pore-forming structure that protect of litholytic geological pile foundation, its characterized in that: the outer casing (1) sinks to reach the bottom of a surface soil layer, the inner casing (2) and the outer casing (1) are concentric and sink to penetrate through a karst development layer, the reinforced concrete pile foundation (3) is poured in the inner casing (2), and the deepest part of the reinforced concrete pile foundation enters a rock substrate.
2. The dual casing pore-forming structure of karst geological pile foundation of claim 1, characterized in that: between outer protecting cylinder (1) and the interior protecting cylinder (2), the last border of interior protecting cylinder (2) is higher than the last border of outer protecting cylinder (1), and outer protecting cylinder (1) last border sets up a plurality of locating pieces (4), and locating piece (4) and the outer circumference sliding contact of interior protecting cylinder (2).
3. The dual casing pore-forming structure of karst geological pile foundation of claim 1, characterized in that: the periphery of the earth surface of the outer protective cylinder (1) is provided with a hardened ground (5), and the upper plane of the hardened ground (5) is lower than the upper edge of the outer protective cylinder (1).
4. The dual casing pore-forming structure of karst geological pile foundation of claim 2, characterized in that: the base (41) of the positioning block (4) is welded and fixed on the upper edge of the outer casing (1), and a plurality of longitudinal positioning ribs (42) are welded on the base (41) and are in sliding contact with the outer circumference of the inner casing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921858109.3U CN211421112U (en) | 2019-10-31 | 2019-10-31 | Double-casing pore-forming structure of karst geological pile foundation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921858109.3U CN211421112U (en) | 2019-10-31 | 2019-10-31 | Double-casing pore-forming structure of karst geological pile foundation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523205A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团第五工程有限公司 | Pile foundation construction method for easy-collapse thick covering layer opening karst cave geology |
| CN113445488A (en) * | 2021-07-16 | 2021-09-28 | 中铁六局集团有限公司 | Method for treating underground pipeline or karst cave |
| CN114673188A (en) * | 2022-03-31 | 2022-06-28 | 中铁二十局集团第二工程有限公司 | Karst area pile foundation construction method and karst area pile foundation construction device |
-
2019
- 2019-10-31 CN CN201921858109.3U patent/CN211421112U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523205A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团第五工程有限公司 | Pile foundation construction method for easy-collapse thick covering layer opening karst cave geology |
| CN113445488A (en) * | 2021-07-16 | 2021-09-28 | 中铁六局集团有限公司 | Method for treating underground pipeline or karst cave |
| CN114673188A (en) * | 2022-03-31 | 2022-06-28 | 中铁二十局集团第二工程有限公司 | Karst area pile foundation construction method and karst area pile foundation construction device |
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