CN217870461U - Construction structure of karst district bored concrete pile - Google Patents
Construction structure of karst district bored concrete pile Download PDFInfo
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- CN217870461U CN217870461U CN202220769492.0U CN202220769492U CN217870461U CN 217870461 U CN217870461 U CN 217870461U CN 202220769492 U CN202220769492 U CN 202220769492U CN 217870461 U CN217870461 U CN 217870461U
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Abstract
The utility model provides a construction structures of karst district bored concrete pile belongs to bridge pile foundation construction technical field. The construction structure of the karst area cast-in-place pile comprises a pile foundation and a karst cave filling body on the periphery of the pile foundation; the pile foundation is sequentially provided with a reinforcement cage and a steel casing from inside to outside, and super-retarding concrete is filled between the reinforcement cage and the steel casing; the karst cave obturator is including the injection portion and the supporting part that from top to bottom set gradually, injection portion has the interval with the pile foundation, and two at least injection portion evenly distributed are peripheral at the pile foundation, the supporting part contacts with the pile foundation. This construction structures of karst district bored concrete pile can prevent accidents such as the pile body slope after the pouring, downthehole collapse, can effectively guarantee the construction quality and the atress performance of karst pile foundation.
Description
Technical Field
The utility model relates to a bridge pile foundation construction technical field especially relates to a construction structures of karst district bored concrete pile.
Background
In the highway construction of China, the construction of the bridge pile foundation mostly adopts the bored pile, the process of the bored pile construction technology under the geological condition of the non-karst pile foundation is single, the progress of the construction period is controllable, the construction process is mature, and the bored pile construction technology adopted in the karst pile foundation construction can form holes only by adopting measures of backfilling rubble clay, cement doping, steel casing follow-up and the like. The method can improve pile forming efficiency and quality of a pile foundation, but cannot avoid the problems that grout leakage occurs in the pouring possibly occurring in the construction of a karst pile foundation or the sectional dimension of the pile foundation does not accord with engineering quality requirements, hole collapse and the like, and has long hole forming time and difficult hole forming; when an oversized karst cave is met, the lateral constraint of the cast-in-place pile in the karst cave range is weak, and certain safety risk exists.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problem that a karst area bored concrete pile's that is difficult for leaking thick liquid, is difficult for collapsing hole, safety and stability construction structure is provided.
The utility model provides a construction structure of a karst region filling pile, which comprises a pile foundation and a karst cave filling body at the periphery of the pile foundation; the pile foundation is provided with a steel protection cylinder and a reinforcement cage from outside to inside in sequence, the steel protection cylinder is filled with super-retarding concrete, and the reinforcement cage is embedded in the super-retarding concrete.
Wherein, the karst cave obturator is including the injection portion and the supporting part that from top to bottom set gradually, injection portion has the interval with the pile foundation, and two at least injection portion evenly distributed are peripheral at the pile foundation, the supporting part contacts with the pile foundation.
The steel casing is formed by connecting and combining at least two sections of sleeves end to end, and every two adjacent sections of sleeves are connected through a connecting steel plate and a fastener.
The steel protecting cylinder is characterized in that a connecting steel plate is arranged at the bottom of the steel protecting cylinder, and a cutting edge is arranged at the free end of the connecting steel plate.
Wherein, the material of sword foot is alloy steel.
The blade foot comprises a cutting part and a connecting part, the cutting part is in a right trapezoid shape, the inclined surface of the cutting part faces downwards, and the connecting part is connected with the connecting steel plate.
The inner wall of the steel casing is provided with a welding steel bar, and the welding steel bar is composed of longitudinal ribs and transverse ribs.
Wherein, the material of the karst cave filling body comprises clay.
Wherein, the material of the karst cave filling body comprises backfill soil.
The beneficial effects of the utility model reside in that: the utility model provides a construction structure, use injection solution cavity obturator parcel steel to protect a section of thick bamboo, can play the side direction constraint effect to the steel protects a section of thick bamboo, prevent when carrying out concrete placement in the steel protects a section of thick bamboo, the steel protects a section of thick bamboo probably to appear inclining, and the solution cavity obturator can avoid when pouring concrete in the steel protects a section of thick bamboo, the concrete leaks the solution cavity from the concatenation seam between the steel protects a section of thick bamboo; the steel casing can play a role in supporting the wall of the drilled hole of the pile foundation, and accidents such as in-hole collapse and the like which possibly occur in the process of drilling the pile foundation are prevented; the steel reinforcement is welded on the inner wall of the steel pile casing, so that the inner wall of the steel pile casing is rougher and is more closely combined with the ultra-retarding concrete poured into the steel pile casing to form a pile foundation structure with the whole stress of the steel pile casing and the ultra-retarding concrete, and the construction structure of the karst area cast-in-place pile can effectively guarantee the construction quality and the stress performance of the karst pile foundation.
Drawings
Fig. 1 is a construction structure diagram of a karst region cast-in-place pile according to an embodiment of the present invention;
fig. 2 is a top view of a steel casing and a reinforcement cage according to an embodiment of the present invention;
fig. 3 is a schematic structural view of the bottom of the steel casing according to the embodiment of the present invention;
FIG. 4 is a schematic structural view of a casing joint according to an embodiment of the present invention;
description of the reference symbols: 1. a pile foundation; 11. a steel casing; 111. a sleeve; 112. connecting steel plates; 113. a fastener; 114. a blade leg; 12. a reinforcement cage; 13. ultra-retarded concrete; 14. welding reinforcing steel bars; 141. a longitudinal rib; 142. a transverse rib;
2. a karst cave filling body; 21. an injection part; 22. a support portion.
Detailed Description
In order to explain the technical contents, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The utility model discloses the most crucial design lies in: the steel casing with the blade foot can support the hole wall of a pile foundation drill hole, and also becomes a part of a karst pile foundation structure during operation, so that the construction efficiency and safety can be improved, and the integral stress performance of the karst pile foundation structure can be improved; the karst cave filler is used for wrapping the steel pile casing, so that concrete is prevented from leaking into the karst cave when concrete is poured, and accidents such as inclination of the steel pile casing in the construction process can be prevented.
Referring to fig. 1-2, the construction structure of the karst area cast-in-place pile of the present invention includes a pile foundation 1 and a karst cave filling body 2 at the periphery of the pile foundation 1; the pile foundation 1 is sequentially provided with a reinforcement cage 12 and a steel sleeve 11 from inside to outside, and super-retarding concrete 13 is filled between the reinforcement cage 12 and the steel casing 11.
As can be seen from the above description, the utility model has the advantages that: the karst cave filling body 2 is used for wrapping the steel casing 11, so that concrete is prevented from leaking into the karst cave when concrete is poured, the matching of the karst cave filling body 2, the steel casing 11 and the steel bars can prevent accidents such as inclination of a poured pile body, collapse in a hole and the like, and the construction structure of the karst region pouring pile can effectively ensure the construction quality and the stress performance of the karst pile foundation 1; the steel casing 11 is adopted to protect the wall in the construction process, and the method has the advantages of short pile forming period, good pile forming quality, less slurry pollution and the like. The karst area adopts the bored concrete pile, because uncertain factors such as underground hole is great, pore-forming, machinery, karst cave, need prolong the initial set time, compound continuous pouring's demand, consequently select super slow setting concrete 13 as the filling material in the steel casing, solved the problem that the pouring time of large-scale bridge single pile is longer, guarantee once to pour into successfully, can effectively solve karst landform and adopt the problem such as hole collapse, necking down that ordinary worker method appears when carrying out the bored concrete pile construction.
Further, the karst cave obturator 2 is including the injection portion 21 and the supporting part 22 that from top to bottom set gradually, injection portion 21 and pile foundation 1 have the interval, and two at least injection portion 21 evenly distributed are peripheral at pile foundation 1, supporting part 22 and pile foundation 1 contact.
Further, the karst cave filling body 2 forms a soil pile with a small upper radius and a large lower radius in the karst cave.
As can be seen from the above description, the soil heap with small upper radius and large lower radius can provide enough support for the steel casing 11, and the karst cave filling body 2 is filled to the ground, so that the karst cave filling body 2 is ensured to compactly wrap the steel casing 11, and meanwhile, the ground is prevented from water seepage into the karst cave.
Referring to fig. 4, further, the steel casing 11 is formed by connecting and combining sleeves 111 end to end, and two adjacent sleeves 111 are connected by a connecting steel plate 112 and a fastener 113.
As can be seen from the above description, the steel sleeve is designed to have at least two sections of the casing 111 connected end to end, which saves production cost and allows for easy and quick replacement and connection.
Referring to fig. 3, a connecting steel plate 112 is further disposed at the bottom of the steel casing 11, and a cutting edge 115 is disposed at a free end of the connecting steel plate 112.
As can be seen from the above description, the cutting edge 115 is provided at the bottom of the steel casing 11 to facilitate the cutting of the steel casing 11 in the soil or rock formation.
Further, the material of the blade leg 115 is alloy steel.
As can be seen from the above description, the cutting edge 115 is stronger than the steel casing, and when it is worn, it is often the steel structure around the cutting edge 115 that deforms or wears, thereby protecting the steel casing 11 from wear.
Further, the blade 115 is composed of a cutting portion having a right trapezoid shape with a downward slope, and a connecting portion connected to the connecting steel plate 112.
As can be seen from the above description, the cutting edge 115 is designed as a replaceable structure, which saves replacement costs after wear.
Further, the inner wall of the steel casing 11 is provided with a welding steel bar 14, and the welding steel bar 14 is composed of a longitudinal rib 141 and a transverse rib 142.
As can be seen from the above description, the welded steel bars 14 are disposed on the inner wall of the steel casing 11, so that the inner wall of the steel casing 11 is rougher and is more tightly combined with the super-retarding concrete 13 poured into the steel casing 11, thereby forming a pile foundation structure with the whole stress of the steel casing 11, the reinforcement cage 12, and the super-retarding concrete 13.
Further, the material of the cavern filling body 2 includes clay.
As can be seen from the above description, the clay makes the cavern filling body 2 more compact and more stable to support the steel casing 11.
Further, the material of the karst cave filling body 2 comprises backfill soil.
As can be seen from the above description, the karst cave filling body 2 comprises backfill soil, so that the backfill cost can be effectively saved.
The utility model discloses a construction structures of karst district bored concrete pile is applied to karst district pile foundation 1 construction.
Referring to fig. 1 to 4, a first embodiment of the present invention is:
a construction structure of a karst area cast-in-place pile comprises a pile foundation 1 and karst cave filling bodies 2 which are uniformly distributed on the periphery of the pile foundation 1; the concrete cave filling structure is characterized in that a reinforcement cage 12 and a steel casing 11 are sequentially arranged on a pile foundation 1 from inside to outside, super-retarding concrete 13 is arranged between the reinforcement cage 12 and the steel casing 11, a supporting part 22 of a karst cave filling body 2 forms a soil pile with a small upper radius and a large lower radius in a karst cave to wrap the steel casing, an injection part 21 of the karst cave filling body 2 is spaced from the pile foundation 1, and 5 the injection parts 21 are uniformly distributed on the periphery of the pile foundation 1; the steel casing 11 is formed by connecting and combining two adjacent sections end to end through a connecting steel plate 112 and a fastener 113 by a plurality of sleeves 111 (the number of the sleeves 111 is specifically selected according to the depth from a soil layer); the bottom of the steel casing 11 is provided with a connecting steel plate 112, and the free end of the connecting steel plate 112 is provided with an alloy steel blade 115; the blade leg 115 is composed of a cutting part and a connecting part, the cutting part is in a right trapezoid shape, the inclined surface is downward, and the connecting part is connected with the connecting steel plate 112; the inner wall of the steel casing 11 is provided with welded steel bars 14, the welded steel bars 14 are composed of longitudinal ribs 141 and transverse ribs 142, and the karst cave filling body 2 is made of clay and backfill soil.
Before construction, uniformly excavating 5 karst cave injection holes around the position of a pile foundation 1 until the karst cave position is excavated, and pouring clay and backfill soil to form a soil body wrapping a post-stage pile body and ensure that post-cast concrete does not flow away; and then, leveling the construction site of the pile foundation 1, and installing a full-slewing drilling machine and a sleeve 111 after the pile position is lofted.
During soil layer operation, the steel casing 11 is rotated to a pressing depth of about 2.5-3.5 m, then a rotary drill is used for taking soil from the casing 111, soil is grabbed while the casing 111 is continuously pressed downwards, the depth of the bottom opening of the casing 111, which is ahead of the excavation surface, is always kept to be not less than 2.5m, the pile body can be ensured to be vertical, and collapse in the hole can be prevented. After the first casing 111 is completely pressed into the soil (2.5-3.5 m is reserved above the ground so as to be convenient for taking over), detecting the verticality and correcting the deviation, installing the second casing 111 until the second casing is qualified, continuously pressing down by a rotary drilling machine and matching with rotary drilling to take out the soil, and repeatedly circulating until the rock stratum is damaged.
During rock stratum operation, in order to reduce rock stratum resistance, the drilling rod is used for carrying out rock crushing operation first, the rotary drilling is used for advance drilling, the casing 111 is driven in when the drilling depth is about 2m, until the designed pile bottom elevation is reached, and drilling is completed.
After the hole depth satisfies the design requirement, demolish road bed board and full-circle gyration host computer, take away and dig the brill soon, clear up the hole, hang and put steel reinforcement cage 12 and fix a position fixedly at the drill way, avoid taking place to float the cage phenomenon at the concrete pouring in-process, pour super slow concrete again, accomplish pile foundation 1 construction.
The construction method adopts a construction process of full rotation and full casing follow-up, and has small disturbance on the natural soil body in the drilling process, thereby avoiding the cave collapse possibly caused by vibration.
The utility model discloses a theory of operation does: the karst cave filling body 2 wraps the pile foundation 1, so that concrete is prevented from leaking to the karst cave when concrete is poured; meanwhile, the karst cave filling body 2 is matched with the steel pile casing 11 and the steel reinforcement cage 12 in the pile foundation 1 to prevent accidents such as inclination of a poured pile body and collapse in a hole, steel reinforcements 14 are welded on the inner wall of the steel pile casing 11, so that the inner wall of the steel pile casing 11 is rougher and is combined with the ultra-retarding concrete 13 poured in the steel pile casing 11 more tightly, and a pile foundation structure with the whole stress of the steel pile casing 11 and the ultra-retarding concrete 13 is formed. The construction structure of the karst region cast-in-place pile can effectively ensure the construction quality and the stress performance of the karst region pile foundation 1; the super-retarding concrete 13 is selected as the pouring material in the steel casing, so that the problem of long pouring time of a large bridge single pile is solved, the success of primary pouring is ensured, and the problems of hole collapse, necking and the like in the construction of the pouring pile in the karst landform by adopting a common construction method can be effectively solved.
The above mentioned is only the embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (8)
1. A construction structure of a karst region cast-in-place pile is characterized by comprising a pile foundation and a karst cave filling body on the periphery of the pile foundation; the pile foundation is sequentially provided with a reinforcement cage and a steel casing from inside to outside, and super-retarding concrete is filled between the reinforcement cage and the steel casing;
the karst cave obturator is including the injection portion and the supporting part that from top to bottom set gradually, injection portion has the interval with the pile foundation, and two at least injection portion evenly distributed are peripheral at the pile foundation, supporting part and pile foundation contact.
2. The construction structure of the karst region cast-in-place pile as claimed in claim 1, wherein the steel casing is formed by connecting and combining at least two sections of sleeves end to end, and two adjacent sections of sleeves are connected through connecting steel plates and fasteners.
3. The construction structure of the karst area cast-in-place pile as claimed in claim 1, wherein the bottom of the steel casing is provided with a connecting steel plate, and the free end of the connecting steel plate is provided with a cutting edge.
4. The construction structure of the karst region cast-in-place pile as claimed in claim 3, wherein the material of the blade foot is alloy steel.
5. The construction structure of the karst area bored pile according to claim 3, wherein the leg is composed of a cutting part having a right trapezoid shape with a downward slope and a connecting part connected to the connecting steel plate.
6. The construction structure of the karst region cast-in-place pile according to claim 1, wherein the inner wall of the steel casing is provided with welded steel bars, and the welded steel bars are composed of longitudinal ribs and transverse ribs.
7. The construction structure of karst area bored concrete pile according to claim 1, wherein the material of the karst cave filling body comprises clay.
8. The construction structure of a karst region cast-in-place pile according to claim 1, wherein the material of the karst cave filling body comprises backfill soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220769492.0U CN217870461U (en) | 2022-04-02 | 2022-04-02 | Construction structure of karst district bored concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220769492.0U CN217870461U (en) | 2022-04-02 | 2022-04-02 | Construction structure of karst district bored concrete pile |
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| Publication Number | Publication Date |
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| CN217870461U true CN217870461U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220769492.0U Active CN217870461U (en) | 2022-04-02 | 2022-04-02 | Construction structure of karst district bored concrete pile |
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| CN (1) | CN217870461U (en) |
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- 2022-04-02 CN CN202220769492.0U patent/CN217870461U/en active Active
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