CN115419054A - Device and method for constructing large-volume pile foundation in karst strong development stratum - Google Patents
Device and method for constructing large-volume pile foundation in karst strong development stratum Download PDFInfo
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- CN115419054A CN115419054A CN202211233907.3A CN202211233907A CN115419054A CN 115419054 A CN115419054 A CN 115419054A CN 202211233907 A CN202211233907 A CN 202211233907A CN 115419054 A CN115419054 A CN 115419054A
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- outer steel
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- head
- pile
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- 238000000034 method Methods 0.000 title claims description 14
- 239000002689 soil Substances 0.000 claims abstract description 56
- 238000010276 construction Methods 0.000 claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 59
- 239000010959 steel Substances 0.000 claims description 59
- 230000018109 developmental process Effects 0.000 claims description 18
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 17
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 17
- 241001330002 Bambuseae Species 0.000 claims description 17
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 17
- 239000011425 bamboo Substances 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 13
- 230000036346 tooth eruption Effects 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 claims description 2
- 239000011449 brick Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 13
- 238000005553 drilling Methods 0.000 description 11
- 241000309551 Arthraxon hispidus Species 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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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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- 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
Abstract
The invention discloses a karst strong development stratum large-volume pile foundation construction device and a karst strong development stratum large-volume pile foundation construction method, which belong to the technical field of large-volume pile foundation construction, and comprise a carrier, wherein a vertical slide rail is arranged on the carrier, a moving vehicle is movably arranged on the slide rail, and a rotary digging mechanism is rotatably arranged on the moving vehicle; the rotary excavating mechanism comprises: the movable trolley comprises a spiral shaft, a fixed cylinder and a rotating mechanism, wherein the fixed cylinder is vertically and rotatably arranged on the movable trolley, the spiral shaft is coaxially and rotatably arranged in the fixed cylinder, the rotating mechanism is fixedly arranged on the movable trolley, a rotating head is arranged at the lower end of the fixed cylinder and is used for arranging a tooth position, a mud inlet is formed in the tooth position, and the rotating mechanism drives the spiral shaft to rotate in the fixed cylinder and lead soil in the rotating head to the upper end of the fixed cylinder. The rotary brick needs to be replaced when the rotary digging soil taking is carried out, and the rotary brick needs to be replaced when the rock is broken, so that the material cost is improved, and the working efficiency is also reduced.
Description
Technical Field
The invention belongs to the technical field of large-volume pile foundation construction, and particularly relates to a device and a method for constructing a large-volume pile foundation in a karst strong development stratum.
Background
The geological structure of the karst strong development stratum is very complex, the internal trend and trend of the karst strong development stratum can not be followed by any rule, the karst strong development stratum has the characteristics of wide distribution range of the karst, large number of vertical layers, vertical beaded shape, large thickness of a single-layer karst cave layer, soft plastic or flow plastic shape of fillers, and the like, and meanwhile, the karst stratum has huge harm to the pile foundation and brings great difficulty to the construction of pile foundation engineering along with the fact that underground karst water is very abundant.
Pile group foundations are usually adopted during building pile foundation design, the pile foundation size is usually large, and the construction efficiency is low. The existing construction method of the pile foundation engineering in the karst strong development stratum is that an outer protective cylinder drills into the stratum from the soil layer → then a rotary drill is added to fetch earth in the outer protective cylinder, the earth is poured → a rotary drill bit for fetching the rock is replaced again → the rotary drill bit is screwed to the upper end of the outer protective cylinder to be close to the ground → the outer protective cylinder is lengthened to drill in the first stratum and penetrate through the first karst cave to the second stratum. The method needs to continuously switch the rotary digging rotary head and the outer protective sleeve, wastes a large amount of time for replacing equipment, and reduces the construction efficiency, so that the construction of the pile foundation with the karst strongly developed stratum flaky is difficult to guarantee in the aspects of construction period, cost, quality, safety, environmental protection and the like when the conventional method is adopted for construction.
Disclosure of Invention
In view of the above, the invention aims to provide a device and a method for constructing a large-volume pile foundation in a karst strong development stratum, so as to solve the problems that in the prior art, when soil is dug and taken out, soil rotary bricks need to be replaced, when rocks are crushed, the material cost is improved, and the working efficiency is also reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention relates to a large-volume pile foundation construction device for a karst strong development stratum, which is characterized in that: the device comprises a carrier, wherein a vertical slide rail is arranged on the carrier, a moving vehicle is movably arranged on the slide rail, and a rotary digging mechanism is rotatably arranged on the moving vehicle; the rotary excavating mechanism comprises: the device comprises a screw shaft, a fixed cylinder and a rotating mechanism, wherein the fixed cylinder is vertically and rotatably arranged on the movable vehicle, the screw shaft is coaxially and rotatably arranged in the fixed cylinder, the rotating mechanism is fixedly arranged on the movable vehicle, a rotating head is arranged at the lower end of the fixed cylinder, a plurality of tooth-row crushing heads are arranged at the lower end of the rotating head along the radius direction, a mud inlet is formed in the tooth-row position of the rotating head, and the rotating mechanism drives the screw shaft to rotate in the fixed cylinder and guides soil entering the rotating head to the upper end of the fixed cylinder;
still protect a section of thick bamboo including outer steel, outer steel protects a section of thick bamboo and is two halves setting, the outside lateral sliding of solid fixed cylinder is equipped with a plurality of joint heads, the joint head with be equipped with first spring between the solid fixed cylinder outside is inside outer steel protect a section of thick bamboo the inboard be equipped with joint head complex joint groove, two halves outer steel protects a section of thick bamboo laminating and is in solid fixed cylinder outside and synthetic tube-shape make joint head joint card goes into the joint groove, the joint head upside is the inclined plane setting, when solid fixed cylinder shifts up, the joint head shifts out along the inclined plane the joint groove.
Furthermore, the rotating head is arranged at the lower end of the fixed cylinder in a sliding manner, a plurality of guide support rods are fixedly arranged at the upper end of the rotating head, a baffle ring is fixedly arranged in the middle section of each guide support rod, a plurality of limit grooves are formed in the lower end of the fixed cylinder, the guide support rods are vertically arranged in the limit grooves in a sliding manner, second springs are arranged at the upper end and the lower end of the baffle ring, and the second springs are abutted between the limit grooves and the baffle ring.
Further, the outer steel casing includes: the bottom barrel and the connecting barrels are arranged at the lower end of the bottom barrel, a plurality of cutting teeth are arranged at the outer sides of the cutting teeth in an inclined mode, the connecting barrels are sequentially connected with the upper end of the bottom barrel in an end-to-end mode, and the two ends of each connecting barrel and the upper end of the bottom barrel are provided with connecting pieces used for connecting.
Furthermore, a soil separating head is arranged in the middle of the bottom end of the rotating head, the soil separating head is conical, the side face of the soil separating head is spirally arranged, and the sludge inlet is surrounded on the periphery of the soil separating head.
Furthermore, a plurality of drainage plates are arranged at the bottom end of the rotary head.
Further, still include and collect the inclined plane, it connects to collect the inclined plane and be used for leading earth to ground at the solid fixed cylinder upper end.
Further, a karst strong development stratum large-volume pile foundation method;
the construction steps are as follows:
s1, measuring paying-off and pile positioning;
s2, arranging a rotary digging mechanism above a layer to be dug, fixing two first-layer outer steel casings on the outer layer of the rotary digging mechanism, descending the rotary digging mechanism, enabling the rotary digging mechanism to drive the outer steel casings to be screwed into a pile positioning position, and checking the verticality in the screwing-in process;
s3, impacting and crushing the rock through a rotary head after the bottom cylinder and the rotary digging mechanism drill the soil layer to the rock stratum;
s4, taking and dumping soil in the outer steel pile casing by the rotary digging mechanism;
s5, after the upper end of the outer steel casing is about to be turned into a pile hole, the outer steel casing is spliced with another connecting cylinder;
s6, driving the outer steel casing to drill to the designed pile bottom elevation by the rotary digging mechanism;
s7, pulling out the rotary digging mechanism;
s8, placing a disposable steel casing with the same height as the drilled hole into the outer steel casing;
s9, pouring concrete to a position above the elevation of the designed pile top by 800mm;
s10, pulling out the outer steel casing (the disposable steel casing is not pulled out).
The invention has the beneficial effects that:
the invention relates to a construction device and a construction method for a massive pile foundation in a karst strong development stratum, which have strong adaptability of machines and equipment, and are suitable for various high backfill layers, water-rich layers, muddy sand rock layers and complex karst cave geology, wherein a full-steel casing follow-up rotary excavating device is used for drilling in a bad stratum to form a retaining wall by utilizing a full-follow-up outer steel casing, so that accidents such as inclination of a rotary excavating mechanism, squeezing drilling, sticking of a drill bit, burying of a drill bit and the like caused by the fact that a filler is liquefied and flows into a pile hole when a hole collapse or a karst cave is punctured are prevented; the drilling speed is fast, and the pore-forming efficiency is high. The all-steel pile casing follow-up rotary excavating equipment can follow up the retaining wall in a karst strong development stratum so as to achieve rapid hole forming, and the work efficiency is obviously improved. The construction process is safe and environment-friendly. The drilling process safety ring protects, the place is clean and tidy, need not to carry out a large amount of slabstone clay and backfill the mud dado, need not to set up the mud pit and carry out the mud circulation, does not have a large amount of mud outward transportation and handles, only needs to set up the sedimentation tank and collects, deposits pouring the muddy water that the in-process spilled out ground, only has a small amount of drilling silt and mud and need the internal transportation of field and outward transportation. No pollution to underground water and surrounding environment. The rotary drill is used for replacing a percussion drill, the influence on the existing peripheral buildings can be minimized, and the damage to the foundation and the structure of the adjacent buildings is avoided.
Additional advantages, objects, and features of the invention will be set forth in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view of the connection of the base cartridge to the connector cartridge in accordance with the present invention;
FIG. 3 is an enlarged view of the invention at A;
FIG. 4 is an enlarged view of the present invention at C;
FIG. 5 is an enlarged view of the swivel of the present invention;
FIG. 6 is an enlarged view of the invention at B;
FIG. 7 is a bottom view of the swivel of the present invention;
FIG. 8 is a schematic diagram of the present invention before operation;
FIG. 9 is a schematic view of the present invention.
The drawings are numbered as follows: 1. carrying a machine; 2. a slide rail; 3. a mobile vehicle; 4. a screw shaft; 5. a bottom cylinder; 6. a fixed cylinder; 7. a crushing head; 8. a limiting groove; 9. a second spring; 10. a guide stay bar; 11. turning the head; 12. a rotating mechanism; 13. tooth arrangement; 14. a first spring; 15. a clamping groove; 16. a clamping head; 18. a disposable steel casing; 19. a sludge inlet; 20. cutting teeth; 21. a reinforcement cage; 22. a connecting cylinder; 23. dividing soil; 24. a drainage plate; 25. a baffle ring; 26. and (7) collecting the tank.
Detailed Description
As shown in fig. 1 to 7, the device and the method for constructing the pile foundation in large volume in the karst strong development stratum comprise a carrier 1, wherein a vertical slide rail 2 is arranged on the carrier 1, a slidable moving vehicle 3 is arranged on the slide rail 2, and the moving vehicle 3 can vertically slide on the slide rail 2 through electric drive; a rotary digging mechanism is rotatably arranged on the moving vehicle 3; the rotary digging mechanism comprises: the device comprises a screw shaft 4, a fixed cylinder 6 and a rotating mechanism 12, wherein the fixed cylinder 6 is vertically and rotatably arranged on a moving vehicle 3, the moving vehicle 3 can drive the fixed cylinder 6 to rotate through electric drive, the screw shaft 4 is coaxially and rotatably arranged in the fixed cylinder 6, the rotating mechanism 12 is fixedly arranged on the moving vehicle 3, the lower end of the fixed cylinder 6 is provided with a rotary head 11, the lower end of the rotary head 11 is provided with two rows of teeth 13 along the radius direction, the rotary head 11 is provided with a mud inlet 19 at the position of the teeth 13, and the teeth 13 can scrape mud into the mud inlet 19; the rotating mechanism 12 drives the screw shaft 4 to rotate in the fixed cylinder 6, so that the screw shaft 4 and the fixed cylinder 6 are reversely rotated, and soil of the screw shaft 4 generates a driving force from bottom to top, so that soil entering the rotor 11 is guided to the upper end of the fixed cylinder 6;
still protect a section of thick bamboo including outer steel, outer steel protects a section of thick bamboo and is two halves setting, the length of solid fixed cylinder 6 is 6 meters, outer steel protects a section of thick bamboo and includes: the cutting device comprises a bottom barrel 5 and a plurality of connecting barrels 22, wherein a plurality of cutting teeth are arranged at the lower end of the bottom barrel 5 and are arranged in an outward inclined mode, the connecting barrels 22 are sequentially connected to the upper end of the bottom barrel 5 end to end, and connecting pieces for connection are arranged at the two ends of each connecting barrel 22 and the upper end of the bottom barrel 5; the outside lateral sliding of solid fixed cylinder 6 is equipped with a plurality of joint 16, solid fixed cylinder 6 establishes one deck joint 16 every 1 meter, joint 16 is the level and encircles in the solid fixed cylinder 6 outside, the quantity of each layer joint 16 is 6, joint 16 with be equipped with first spring 14 between the solid fixed cylinder 6 outside is inside, outer steel protect the inboard of a section of thick bamboo be equipped with joint 16 complex joint groove 15, two halves the outer steel protects a section of thick bamboo laminating and is in gu fixed cylinder 6 outside and synthetic tube-shape make joint 16 card income joint groove 15, joint 16 upside is the inclined plane setting, gu when fixed cylinder 6 shifts up, joint shifts out along the inclined plane joint groove.
The working mode of the device is as follows: firstly, a pile position is well determined, then the two half-shaped bottom barrels 5 are buckled and clamped on the outer side of the rotary digging mechanism, and the rotary digging mechanism drives the bottom barrels 5 to rotate downwards into a hole together when rotating and digging downwards; the moving vehicle 3 is driven to enable the rotary digging mechanism to rotate, the rotary digging mechanism is enabled to dig the pile hole in a rotary mode through the moving vehicle 3, the bottom cylinder 5 and the rotary digging mechanism are drilled for construction, and the perpendicularity of the steel protection cylinder is calibrated. After drilling a bottom barrel 5, hoisting the other two halves of the external connecting barrels 22 by using a drilling machine pair, buckling the other two halves of the connecting barrels 22 at the outer side of the fixed barrel 6, clamping the connecting barrels with the external steel protective barrel drilled underground, continuing drilling construction, driving the screw shaft 4 to rotate by using a rotating mechanism, enabling the screw shaft 4 to generate a driving force from bottom to top on soil screwed in by a rotary head, and pushing the soil to the top of the fixed barrel 6 and discharging the soil; when the rotation is stopped, the rotary excavating mechanism is pulled out of the ground through the moving vehicle 3, the inclined surface of the clamping head contacts with the groove 17 at the moment, the clamping head retracts into the clamping groove, the clamping mechanism is not clamped with the outer steel casing, and the outer steel casing is positioned in the hole. When soil is transferred into the rotary digging mechanism, the rotating mechanism 12 drives the screw shaft 4 to rotate so that the soil is transported to the ground.
The beneficial effect of above-mentioned scheme: the full-follow-up outer steel casing is used for drilling in poor stratum to form a retaining wall, so that filler is prevented from liquefying and flowing into a pile hole when a hole collapses or a karst cave is punctured, the drilling speed is high, and the hole forming efficiency is high. In the construction process, the rotary digging mechanism can also discharge soil and crushed stone without replacing different rotary digging heads, so that the cost of the device is reduced, and the construction efficiency is also improved; the inclined arrangement makes the pile hole formed by rotation slightly larger than the outer steel casing, thereby reducing the friction force between the outer steel casing and the soil in the pile hole.
In an embodiment of the present invention, as shown in fig. 5 and 6, the rotating head 11 is slidably disposed at a lower end of the fixed cylinder 6, the rotating head 11 is disposed at a position away from the fixed cylinder 6, a plurality of guide support rods 10 are fixedly disposed at an upper end of the rotating head 11, a stop ring 25 is fixedly disposed at a middle section of each guide support rod 10, a plurality of limit grooves 8 are disposed at a lower end of the fixed cylinder 6, the guide support rods 10 are vertically slidably disposed in the limit grooves 8, second springs 9 are disposed at upper and lower ends of the stop rings 25, the second springs 9 are abutted between the limit grooves 8 and the stop rings 25, and the rotating head 11 and the fixed cylinder 6 can be retracted into the fixed cylinder 6 through the guide support rods 10, the second springs 9 and the limit grooves 8; the distance between the screw shaft 4 and the rotary head 11 is the same as the disconnection distance between the rotary head 11 and the fixed cylinder 6. The lower end of the screw shaft is spaced to avoid collision, but the screw shaft can still contact with soil.
The working principle of the device is as follows: when the crushing head 7 contacts with the rock, the guide support rod 10 retracts into the limiting groove 8 under stress to drive the rotating head to retract into the fixed cylinder, and then the second spring 9 rebounds to enable the crushing head 7 to rebound back and forth to impact and crush the rock; by the reciprocating movement, an impact force is generated and a abdicating action is exerted, while the movement of the screw shaft 4 is not affected by the punching resilience force by the stopper ring 25 fixedly connected to the guide stay 10.
The beneficial effect of above-mentioned scheme: the second spring 9 and the crushing head 7 can perform a reciprocating impact crushing effect on rocks, so that the rotary digging mechanism can not only dig the soil layer but also crush the rocks, and the time for replacing the rotary digging head is saved; the rotary digging mechanism can also adapt to the complex environment work of soil and crushed stone; the rotor can be caused to impact rock back and forth by the resilience of the second spring 9.
In one embodiment of the present invention, as shown in fig. 5 and 7, a soil separating head 23 is provided in the middle of the bottom end of the rotating head 11, the soil separating head 23 is conical and has spiral side surfaces, the sludge inlet 19 is surrounded around the soil separating head 23, and two flow guide plates 24 are further provided at the bottom end of the rotating head 11.
The working mode of the device is as follows: the soil can be dispersed to the side from the top end of the soil separating head 23 through the soil separating head 23, so that the soil enters the soil inlet 19; when the rotor 11 rotates, soil on the bottom surface of the rotor 11 can be guided into the soil inlet 19 through the flow guide plate 24.
The beneficial effect of above-mentioned scheme: soil is dispersed to the soil inlet 19 through the soil separating head 23, so that the soil in the middle of the rotating head 11 is prevented from being accumulated, and the soil in the middle of the rotating head 11 cannot influence the soil to enter the soil inlet 19; the soil on the bottom surface of the rotor 11 is drained to the soil inlet 19, so that the soil on the bottom surface of the rotor 11 is prevented from being accumulated.
In one embodiment of the invention, as shown in FIG. 1, the outer steel casing is slidably connected to a collection trough 26.
The working mode of the device is as follows: the soil carried out by the screw shafts 4 is collected and carried out through the inclined surface 26 of the collecting tank.
The beneficial effect of above-mentioned scheme: can collect the soil generated by construction.
The construction steps are as follows: as shown in fig. 1 to 9;
s1, measuring paying-off and pile positioning;
s2, driving a rotary digging mechanism to drive a first section of outer steel casing to rotate and press into a pile positioning position and check the verticality;
s3, taking and dumping soil in the outer steel casing by the rotary digging mechanism;
s4, drilling the outer steel casing in the soil layer to a rock stratum crushing head 7 to crush the rock;
s5, after the outer steel pile casing is to be completely rotated into the pile hole, splicing another section of outer steel pile casing with the outer steel pile casing;
s6, driving the outer steel pile casing to drill to the designed pile bottom elevation by the rotary digging mechanism;
s7, hoisting and splicing to put the disposable steel casing 18 into the outer steel casing (the length of the disposable steel casing 18 is from the designed pile top to the designed pile bottom);
s8, hoisting a reinforcement cage 21;
s9, pouring concrete to a position above the elevation of the designed pile top by 800mm;
s10, pulling out the outer steel casing (the disposable steel casing 18 is not pulled out).
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a karst is developed stratum gross pile foundation construction equipment by force which characterized in that: the device comprises a carrier (1), wherein a vertical slide rail (2) is arranged on the carrier (1), a moving vehicle (3) is movably arranged on the slide rail (2), and a rotary digging mechanism is rotatably arranged on the moving vehicle (3); the rotary excavating mechanism comprises: the device comprises a screw shaft (4), a fixed cylinder (6) and a rotating mechanism (12), wherein the fixed cylinder (6) is vertically and rotatably arranged on the moving vehicle (3), the screw shaft (4) is coaxially and rotatably arranged in the fixed cylinder (6), the rotating mechanism (12) is fixedly arranged on the moving vehicle (3), a rotating head (11) is arranged at the lower end of the fixed cylinder (6), a plurality of rows of teeth (13) are arranged at the lower end of the rotating head (11) along the radius direction, a mud inlet (19) is formed in the positions of the rows of teeth (13) of the rotating head (11), and the rotating mechanism (12) drives the screw shaft (4) to rotate in the fixed cylinder (6) and guides mud entering the rotating head (11) to the upper end of the fixed cylinder (6);
still protect a section of thick bamboo including outer steel, outer steel protects a section of thick bamboo and is the setting of two halves, the outside lateral sliding of solid fixed cylinder (6) is equipped with a plurality of joint (16), joint (16) with be equipped with first spring (14) between solid fixed cylinder (6) outside is inside outer steel protect the inboard of a section of thick bamboo be equipped with joint (16) complex joint groove (17), two halves the outer steel protects a section of thick bamboo laminating and is in gu fixed cylinder (6) outside and synthetic tube-shape make joint (16) card income joint groove (17), joint (16) upside is the inclined plane setting, when solid fixed cylinder (6) shifts up, joint (16) shift out along the inclined plane joint groove (17).
2. The device for constructing a massive pile foundation in a karst strong development stratum as claimed in claim 1, wherein: the rotary head (11) is arranged at the lower end of the fixed cylinder (6) in a sliding mode, a plurality of guide support rods (10) are fixedly arranged at the upper end of the rotary head (11), retaining rings (25) are fixedly arranged at the middle sections of the guide support rods (10), a plurality of limiting grooves (8) are formed in the lower end of the fixed cylinder (6), the guide support rods (10) are vertically arranged in the limiting grooves (8) in a sliding mode, second springs (9) are arranged at the upper end and the lower end of each retaining ring (25), and the second springs (9) abut against the space between the limiting grooves (8) and the retaining rings (25).
3. The device for constructing a massive pile foundation in a karst strong development stratum as claimed in claim 1, wherein: the outer steel casing includes: end section of thick bamboo (5) and a plurality of connecting cylinder (22), end section of thick bamboo (5) lower extreme is equipped with a plurality of cutting teeth, the outside slope of cutting tooth sets up, and is a plurality of connecting cylinder (22) end to end connection in proper order end section of thick bamboo (5) upper end, connecting cylinder (22) both ends with end section of thick bamboo (5) upper end all is equipped with the connecting piece that is used for the connection.
4. The device for constructing a massive pile foundation in a karst strong development stratum as claimed in claim 1, wherein: the soil separating device is characterized in that a soil separating head (23) is arranged in the middle of the bottom end of the rotating head (11), the soil separating head (23) is conical, the side face of the soil separating head is spirally arranged, and the sludge inlet (19) is surrounded on the periphery of the soil separating head (23).
5. The device for constructing a massive pile foundation in a karst strong development stratum as claimed in claim 1, wherein: the bottom end of the rotary head (11) is also provided with a plurality of flow guide plates (24) and a plurality of crushing heads (7) for crushing rocks.
6. The device for constructing a massive pile foundation in a karst strong development stratum as claimed in claim 1, wherein: still including collecting the inclined plane, it connects to collect the inclined plane be used for leading earth to ground fixed cylinder (6) upper end.
7. A method for pile foundation with large volume of karst strong development stratum;
the construction steps are as follows:
s1, measuring paying-off and pile positioning;
s2, arranging a rotary digging mechanism above a layer to be dug, fixing two first-layer outer steel casings on the outer layer of the rotary digging mechanism, descending the rotary digging mechanism, enabling the rotary digging mechanism to drive the outer steel casings to be screwed into a pile positioning position, and checking the verticality in the screwing-in process;
s3, impacting and crushing the rock through a rotary head (11) after the bottom barrel (5) and the rotary digging mechanism drill into the soil layer and reach the rock stratum;
s4, taking and dumping soil in the outer steel pile casing by the rotary digging mechanism;
s5, after the upper end of the outer steel pile casing is about to be turned into a pile hole, the outer steel pile casing is spliced with another connecting cylinder (22);
s6, driving the outer steel pile casing to drill to the designed pile bottom elevation by the rotary digging mechanism;
s7, pulling out the rotary digging mechanism;
s8, lowering a disposable steel casing (18) with the same height as the drilled hole into the outer steel casing;
s9, pouring concrete to a position above the elevation of the designed pile top by 800mm;
s10, the outer steel protecting cylinder (the disposable steel protecting cylinder (18)) is pulled out and is not pulled out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211233907.3A CN115419054B (en) | 2022-10-10 | 2022-10-10 | Karst strong development stratum substantial pile foundation construction device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211233907.3A CN115419054B (en) | 2022-10-10 | 2022-10-10 | Karst strong development stratum substantial pile foundation construction device and method |
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| Publication Number | Publication Date |
|---|---|
| CN115419054A true CN115419054A (en) | 2022-12-02 |
| CN115419054B CN115419054B (en) | 2024-03-19 |
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| CN202211233907.3A Active CN115419054B (en) | 2022-10-10 | 2022-10-10 | Karst strong development stratum substantial pile foundation construction device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115419054B (en) | 2024-03-19 |
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