CN115627751A - Hole forming device and construction method for completely weathered granite cast-in-place pile - Google Patents

Abstract

The invention discloses a hole forming device for a completely weathered granite cast-in-place pile and a construction method. The guide assembly of the pore-forming device is connected with the fixed rotating assembly, the drill bit assembly is connected with the propelling assembly, and the clamping device and the locking device are arranged on the fixed rotating assembly; the propelling component is connected with a power arm, and the power arm provides propelling and rotating power for the whole pore-forming device. The perforating drill bit and the fracturing pipe of the pore-forming device are arranged at intervals along the center in an annular mode, when a bored concrete pile is subjected to pore forming, a pore is drilled in a completely weathered granite stratum and filled with the carbon dioxide fracturing pipe, the hole drilling process and the fracturing pipe installation process of the fracturing pipe are integrated through rotary switching, the construction of pore forming of the bored concrete pile on a harder stratum such as the completely weathered granite stratum is quickly realized, meanwhile, the quality of pore forming of the bored concrete pile is guaranteed through accurate drilling, positioning and blasting, and accurate blasting of the completely weathered granite stratum is realized.

Description

Hole forming device and construction method for completely weathered granite cast-in-place pile

Technical Field

The invention relates to a cast-in-place pile in the field of building and rock-soil construction, in particular to a hole forming device and a construction method for a completely weathered granite cast-in-place pile.

Background

With the development of urban construction, the construction pace of infrastructure such as railway bridges and the like is accelerated, pile foundations are more and more widely applied, however, due to the defects of complex engineering geological environment and construction technology in construction and construction, the problems of poor pile foundation construction quality, heavy construction pollution and the like are inevitably caused, and therefore quality assurance and environmental protection management in construction and construction workers are challenged more and more. The traditional driven pile has increasingly serious harm to the surrounding environment and is difficult to adapt to complex strata, the deficiency of the traditional driven pile in construction facilities is more and more emphasized, the cast-in-situ bored pile has little pollution, no soil extrusion, no noise, no vibration and excellent construction effect, and the traditional driven pile becomes an important pile type for replacing the driven pile in partial fields.

Due to different geological historical reasons of different regions, different regions have different stratum distributions, and the hole forming mode of the soft foundation cast-in-place pile is developed more completely, such as a rotary drilling method which is most representative. However, when a hard stratum such as a completely weathered granite stratum is subjected to pore forming, if a traditional rotary drilling bit is still adopted, on one hand, due to the fact that the strength of the bit is insufficient, abrasion is large during drilling; on the other hand, because the construction machinery provides limited power for the rotary drilling bit, the drilling resistance of a hard rock stratum is difficult to overcome, the drilling speed is slow, even the drilling cannot be performed, so that the construction efficiency is low, the construction cost is high, and an ideal hole forming effect cannot be realized.

The construction of bored concrete pile in hard stratum still faces huge technical challenge at present, explodes the mode to the blasting of hard rock stratum mostly to have now, but the blasting excavation of explosive has certain potential safety hazard, causes personnel's injury easily. In actual engineering, large rocks often appear after the explosive is exploded, more crushed aggregates are generated by explosion and splitting, the explosion surface is difficult to control, and meanwhile, smoke dust brought by explosion of the explosive also brings challenges to environmental pollution treatment.

The carbon dioxide fracturing technology is a novel rock stratum fracturing technology, has large blasting power, high safety and little environmental pollution, can realize accurate blasting, and has wide application prospect. But carbon dioxide sends and splits the method installation comparatively loaded down with trivial details, and the efficiency of construction is low, consequently how to provide a neotype device to applying in bored concrete pile pore-forming construction, both guaranteeing the requirement that hard stratum bored concrete pile pore-forming blasting location is accurate, simplify the step of construction again, accelerate construction speed, become the technical problem who needs to solve urgently.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a hole forming device and a construction method for a completely weathered granite cast-in-place pile, and aims to solve the technical problem that high-efficiency hole forming of the cast-in-place pile is difficult to realize in response to harder rock layers in different stratums in the prior art.

The technical scheme is as follows: the invention discloses a hole forming device for a completely weathered granite cast-in-place pile.

The fixed rotating assembly comprises an outer rotating ring and an inner rotating ring, wherein the outer rotating ring and the inner rotating ring are distributed with a buckling unit and a pushing hole; the clamping unit is provided with a clamping hole for the cracking tube, and a locking device for locking the cracking tube is arranged in the clamping hole of the cracking tube; and a clamping device for fixing the drill bit assembly is arranged on the side surface of the buckling unit.

The guide assembly comprises a first rotating ring, a second rotating ring, a drill bit guide pipe and a storage pipe of the fracturing pipe; the guide assembly is connected with the fixed rotating assembly through a storage pipe of the fracturing pipe; the propelling component is connected with the drill bit component and drives the guiding component, the drill bit component, the fixed rotating component and the propelling component to synchronously rotate under the action of the power arm; one end of the storage pipe is extended and connected with the buckling unit, and the top end of the fracturing pipe enters the clamping hole of the fracturing pipe and is locked or loosened through the locking device.

The bottom plate of the outer protection component is provided with a plurality of openings corresponding to the storage pipe of the fracturing pipe or the drill bit of the drill bit component.

The locking device comprises a horizontal buckle, a spring, a locking assembly and a fracturing pipe landfill assembly; the locking assembly comprises a top end buckle of the fracturing pipe, the top end buckle of the fracturing pipe pushes the horizontal buckles to two sides in the jacking process, and the horizontal buckles reset under the action of the spring.

The fracturing pipe burying component comprises a push rod motor and a vertical clamping plate, and the push rod motor drives the horizontal clamping buckle to move through the vertical clamping plate to bury and bury the fracturing pipe.

The drill bit assembly comprises an outer ring drill bit base, an inner ring drill bit base and a drill bit, wherein grooves for accommodating the fracturing pipe storage pipe are formed in the edges of the outer ring drill bit base and the inner ring drill bit base.

Clamping device includes layer board, electric telescopic handle and slide rail, and electric telescopic handle drives the layer board and outwards stretches out along buckle unit normal direction and blocks this outer loop drill bit base.

The pushing assembly comprises an outer base, an inner base and a push rod, and the push rod penetrates through the pushing hole to be connected with the outer ring drill bit base and the inner ring drill bit base.

The first rotating ring comprises a first inner ring and a first outer ring, the second rotating ring comprises a second inner ring and a second outer ring, and a plurality of guide holes which pass through a drill bit or a fracturing pipe are formed in the first inner ring, the second inner ring, the first outer ring and the second outer ring.

The outer protection component further comprises a top plate and a side wall, a through hole penetrating through the push rod is formed in the top plate, and a rolling bearing is arranged between the top plate and the side wall.

The construction method of the hole forming device of the completely weathered granite cast-in-place pile comprises the following steps:

(1) Leveling the field, and positioning the pile position, wherein the deviation of the pile position is less than or equal to 30mm;

(2) Embedding a steel pile casing, and checking the verticality of the steel pile casing, wherein the embedding depth of the steel pile casing is 1-1.5m;

(3) Drilling a hole in a weak stratum by adopting a rotary drilling rig, adjusting the rotary drilling rig to a pile position, adjusting the verticality of a drill bit, and ensuring that the verticality deviation is less than or equal to 1%;

(4) Starting a drilling excavator to dig and drill to form a hole in a rotary mode, stopping the drill bit after the drilling excavator drills in the rotary mode to a set depth in a single drilling mode, and lifting upwards to pour soil;

(5) Carrying out pile position rechecking and pore-forming inspection to ensure the deviation of pile pores or the pore-forming quality;

(6) Repeating the steps (4) and (5), stopping working when the rotary drilling rig encounters a completely weathered granite stratum, lifting the rotary drilling rig upwards, and moving out of the pile hole;

(7) Filling carbon dioxide gas into the fracturing pipe, enabling the storage pipe of the fracturing pipe to correspond to the opening of the bottom plate of the outer protection assembly, and checking an electrode of the fracturing pipe; and then horizontally placing the pore-forming device, pushing the cracking tube into a storage tube of the cracking tube through a bottom plate perforated guide tube of the outer protection assembly, locking and fastening the cracking tube through a locking device in a clamping hole at the top of the cracking tube, and installing the pore-forming device provided with the cracking tube at the position of a drill bit of the drilling machine by using an on-site machine.

(8) The hole forming device is put in place and aligned with the pile hole, and the verticality deviation is ensured to be less than or equal to 1 percent.

(9) Starting the construction machinery, putting the pore-forming device into the pile hole, monitoring the hole bottom condition of the pile hole through a searchlight and a camera, and stopping descending when the outer protection component bottom plate tapping guide pipe touches the bottom of the pile hole of the cast-in-place pile.

(10) Rotating the hole forming device to make the drill align with the bottom plate for hole forming, the process is: starting a clamping device to fix an outer ring drill bit base and an inner ring drill bit base, simultaneously controlling the outer base to rotate for 30 degrees and the inner base to rotate for 60 degrees in the propelling assembly by the power arm, driving the drill bit assembly to rotate for 30 degrees on the outer ring, and aligning the inner ring drill bit and the outer ring drill bit with the bottom plate to open a hole after the inner ring rotates for 60 degrees;

(11) Starting the propelling component and the drill bit motor, enabling the drill bit to extend out of the bottom plate through the drill bit guide pipe to drill downwards, and stopping drilling when the drilling depth reaches a preset depth; the pushing assembly is lifted to drive the drill bit to be retracted into the opening of the bottom plate;

(12) Checking the quality of the hole-forming holes of the drill bit, starting the propelling assembly to control the whole hole-forming device to rotate 30 degrees on the outer ring and 60 degrees on the inner ring after the holes are qualified, and aligning the pipe orifice of the fracturing storage pipe to the hole of the bottom plate of the outer protection assembly, wherein the hole of the bottom plate is aligned to the hole-forming hole drilled by the drill bit;

(13) Burying the fracturing pipe, specifically, starting a locking device, starting a push rod motor and pushing vertical clamping plates to two sides, driving horizontal buckles to move to the two sides by the vertical clamping plates, loosening the horizontal buckles, and putting the fracturing Guan An into a drilling hole; lifting the pore-forming device upwards after the fracturing pipe is placed, and moving out of the pile hole;

(14) Filling and compacting the drill hole by using fine sand, and covering the opening of the pile hole by using a gun;

(15) Exciting an electrode at the top of the fracturing pipe through a wireless remote control device, and exciting high temperature by the electrode to gasify liquid carbon dioxide gas so as to crush rock strata around the fracturing pipe;

(16) After detonation, grabbing and cleaning a broken rock stratum and a fracturing pipe by using a crane, and cleaning and checking holes;

(17) And (5) repeating the steps (7) to (16) until the hole forming depth of the cast-in-place pile reaches the design depth.

In the step (13), the unidirectional fracturing tubes are arranged in the outer holes, and the bidirectional fracturing tubes are arranged in the other holes.

The working principle is as follows: the carbon dioxide cracking technology has the advantages of large blasting power, small pollution and controllable blasting surface. The carbon dioxide fracturing technology converts gaseous carbon dioxide into liquid through high pressure, presses the gaseous carbon dioxide into the carbon dioxide fracturing pipe, and when being aroused micro-current and passing through the heat conduction rod, the rupture membrane is punctured to the high temperature that produces, makes liquid carbon dioxide gasify in the twinkling of an eye, produces huge expanding gas and then dashes towards the stratum, realizes the effect of broken stratum.

The perforating drill bit and the fracturing pipe of the pore-forming device are annularly arranged along the center at intervals, a rotary drilling rig is adopted to form pores on a soft stratum, and a carbon dioxide fracturing technology is adopted to blast the completely weathered granite stratum to form pores; when the bored concrete pile is perforated, the carbon dioxide fracturing pipe is perforated and filled in the completely weathered granite stratum, the perforation process of filling the fracturing pipe into the hole and the mounting process of the fracturing pipe are integrated through rotary switching, the construction of perforating the bored concrete pile on a harder stratum such as the completely weathered granite stratum is quickly realized, meanwhile, the quality of perforating the bored concrete pile is ensured through accurate drilling positioning blasting, the accurate blasting of the completely weathered granite stratum is realized, and the perforating speed is accelerated while the quality of perforating the completely weathered granite stratum is ensured.

Has the advantages that: compared with the prior art, the invention has the following advantages:

(1) The invention applies the carbon dioxide cracking technology to a construction device to form the bored concrete pile pore-forming device, the pore-forming device adopts the carbon dioxide cracking technology, gaseous carbon dioxide is converted into liquid state through high pressure, the liquid state is pressed into a carbon dioxide cracking pipe, a rotary drilling rig is adopted to form pores on a soft stratum, carbon dioxide cracking blasting is adopted to form pores on a harder stratum such as a completely weathered granite stratum, pore-forming excavation under complex stratum conditions can be coped with, the high-efficiency pore-forming of the bored concrete pile is realized, and the application range is wider.

(2) The bored concrete pile hole forming device simultaneously realizes drilling on a completely weathered granite stratum and mounting a fracturing pipe in the hole for blasting, thereby accelerating the construction speed.

(3) The traditional fracturing pipe is punched before installation and the installation process is complicated, and the fracturing pipe is conveniently and quickly filled in the hole forming device. In addition, the protection of the fracturing pipe storage pipe on the fracturing pipe can reduce the disturbance of the drill bit on the fracturing pipe.

(4) Install searchlight and camera on outer protection component bottom plate, can realize exploring and fixing a position drilling bottom surface work mask body condition.

(5) The perforating drill bit and the fracturing pipe of the perforating device are arranged at intervals along the center ring, the perforating process of filling the fracturing pipe into the hole and the mounting process of the fracturing pipe are integrated through rotary switching, the construction of perforating the cast-in-place pile on a harder stratum such as a completely weathered granite stratum is quickly realized, and meanwhile, the quality of perforating the cast-in-place pile is ensured through accurate drilling, positioning and blasting.

(6) According to the cast-in-place pile construction method, the drill is designed and fixedly drilled according to the designed position of the blast hole, the drill guide pipe ensures the verticality and stability of the drill, the drill synchronously drills in the drilling process, the drilling position is accurate, the blasting surface can be accurately controlled, and the construction process is safer and more environment-friendly.

Drawings

FIG. 1 is a main structure diagram of a bored concrete pile hole-forming device according to the present invention;

FIG. 2 is a general view of the bored concrete pile hole forming apparatus according to the present invention;

FIG. 3 is a perspective view of the bored concrete pile hole forming apparatus according to the present invention;

FIG. 4 is a structural diagram of a guide assembly of the cast-in-place pile hole forming device of the invention;

FIG. 5 is a schematic plan view of the drill bit assembly of the present invention;

FIG. 6 is a schematic view of a stationary rotating assembly of the present invention;

FIG. 7 is a schematic plan view of a propulsion assembly of the present invention;

FIG. 8 is a schematic view of the construction of the drill bit assembly of the present invention;

FIG. 9 is a schematic view of the outer shield assembly of the present invention;

wherein, fig. 9 (a) is a schematic diagram of a bottom plate of the outer protection assembly, and fig. 9 (b) is a schematic diagram of a side wall of the outer protection assembly;

FIG. 10 is a side view of the outer shield assembly of the present invention;

FIG. 11 is a view of the bolted connection of the outer shield assembly bottom plate to the outer shield assembly side wall of the present invention;

FIG. 12 is a schematic view of a frac tube installation locking mechanism;

wherein fig. 12 (a) is a side view, and fig. 12 (b) is a top view;

FIG. 13 is a schematic view of a buckle unit of the present invention;

wherein fig. 13 (a) is a schematic view of the clamping means after retraction, fig. 13 (b) is a schematic view of the clamping means after extension, and fig. 13 (c) is a partial schematic view of the clamping means;

FIG. 14 is a schematic view of the internal structure of the buckle unit of the present invention;

wherein fig. 14 (a) is a front view, and fig. 14 (b) is a plan view;

FIG. 15 is a top plate configuration view of the outer shield assembly of the present invention;

wherein, fig. 15 (base:Sub>A) isbase:Sub>A plan view ofbase:Sub>A top plate of the outer shield assembly, and fig. 15 (b) isbase:Sub>A vertical sectional viewbase:Sub>A-base:Sub>A;

fig. 16 is a construction drawing of the cast-in-place pile hole forming device.

Detailed Description

As shown in fig. 1 to 10, the hole forming device for the completely weathered granite bored concrete pile of the present invention includes a guiding component a, a drill bit component b, a fixed rotating component c, a propelling component d, and an outer shielding component. Wherein, the outer protection component plays a maintenance role to the inner space of the outer protection component. When the device works, a gap is reserved between the outer protection assembly and the inner structure, and a rotating space is reserved in the inner structure.

As shown in fig. 1, the guide assembly a of the bored concrete pile hole-forming device of the present invention is connected to a fixed rotary assembly c through a fracturing pipe storage pipe 3. The propelling component d is connected with the drill bit component b through the push rod 14, and the upper part of the propelling component d is connected with the power arm which provides rotation and propelling power for the propelling component d.

As shown in fig. 4, the guide assembly a includes a fixed ring assembly and a guide pipe assembly including a drill guide pipe 1 and a storage tube 3 of a fracturing pipe 32. The guide assembly a is used for guiding the drill bit 8 by connecting the drill bit guide pipe 1, the first rotating ring 2 and the second rotating ring 4 into a whole and penetrating the guide hole 5, so that the drill bit 8 is prevented from shifting in the construction and moving processes. On the other hand, the drill guide 1, the first rotating ring 2, the second rotating ring 4 and the fracturing pipe storage pipe 3 are integrally connected and penetrate through the fracturing pipe storage hole 7 to store the carbon dioxide fracturing pipe 3.

The first rotating ring 2 and the second rotating ring 4 each comprise an inner ring and an outer ring, wherein in the present embodiment, the outer edge of the outer ring is provided with 12 guide holes, and the outer edge and the center of the inner ring are respectively provided with 6 guide holes and 1 guide hole, and the guide holes are communicated for the passage of the drill bit 8 and the fracturing pipe 32. In the invention, a rolling bearing is arranged between the inner ring and the outer ring, so that the inner ring and the outer ring rotate along the center of the ring.

As shown in fig. 5, the drill bit assembly b comprises a drill bit 8, an outer ring bit base 9 and an inner ring bit base 10, wherein the position of the drill bit 8 corresponds to the position of the guide hole 5 in the guide assembly a. The outer edge of the outer ring drill bit base 9 is uniformly provided with 6 drill bits, and the positions of the drill bits on the adjacent outer edge are distributed at 60 degrees relative to the center of the ring. 1 drill bit is arranged at the center of the inner ring drill bit base 10, 3 drill bits are uniformly arranged at the outer edge, and the positions of the drill bits at the adjacent outer edges are distributed at 120 degrees relative to the center of the ring. The inner and outer ring drill bit bases are internally provided with motors to provide rotary power for the drill bits. In the invention, a gap is reserved between the outer ring drill bit base 9 and the inner ring drill bit base 10, and the outer ring drill bit base and the inner ring drill bit base rotate along the center of the bases.

As shown in fig. 3 and 6, the fastening unit 15 of the fixed rotary assembly c is integrally connected with the fracturing tubing storage 3 of the guide assembly a, and is used for arranging the clamping device 18 and the locking device 31. Namely, one end of the storage pipe 3 is extended and connected with the buckling unit 15; the top end of the fracture tube 32 enters the fracture tube clamping hole 20 and is locked or unlocked by the locking device 31.

As shown in fig. 14, the clamping device 18 is an electric telescopic device, and the clamping device 18 is provided with a switch for remotely controlling the telescopic device. A row of clamping devices 18 are respectively arranged on the upper side and the lower side of the fracturing clamping hole 20, each row of four electric telescopic push rods 18-2 are fixedly connected with the clamping devices, the electric telescopic push rods 18-2 are electrically controlled to stretch and retract the clamping devices 18, the slide rails 18-3 are used for keeping the clamping devices 18 not to deviate from the rails when the clamping devices 18 stretch and retract, and the clamping devices 18 are retracted into the buckling units 15 before working.

As shown in fig. 13, panel (a). Taking the outer ring bit base 9 as an example, when the pushing assembly d lifts the bit assembly b to a position close to the outer rotating ring 17 and the inner rotating ring 19, the operator activates the control switch, and the clamping devices 18 are extended outward in the normal direction of both sides of the buckle unit, as shown in fig. 13 (b). On one hand, when the clamping device 18 extends outwards, the outer ring drill base 9 of the drill bit assembly b is clamped to ensure that the position of the outer ring drill base is fixed, and on the other hand, the clamping device supporting plate 18-1 blocks the front end of the outer ring drill base 9 to prevent the outer ring drill base from sliding off, as shown in (c) of fig. 13.

Because the guiding component a is connected with the fixed rotating component c, the drill bit component b is connected with the pushing component d, the drill bit component b and the fixed rotating component c are clamped and fixed through the clamping device 18, and when the pushing component d rotates, the guiding component a, the drill bit component b and the fixed rotating component c are driven to synchronously rotate. The fracturing pipe is pushed into the fracturing pipe storage pipe 3 from a guide hole at the bottom side of the guide assembly adjacent to the drill bit 8 through the outer shield assembly bottom plate opening 22, and the top end of the fracturing pipe is locked by a locking device 31 arranged in the clamping hole 20. In the invention, a rolling bearing is arranged between the inner rotating ring and the outer rotating ring and can rotate along the center of the rotating ring.

As shown in fig. 7 and 8, the propelling assembly d includes an outer base 11, an inner base 12 and a push rod 14. The push rod 14 passes through the push hole 16 and is connected with the inner and outer drill bit bases to transmit forward thrust for drilling the drill bit 8 during operation. In the invention, a rolling bearing is arranged between the inner base and the outer base and can rotate along the center of the bases.

As shown in fig. 3, fig. 5 and fig. 8, the drill bit assembly b and the propelling assembly d are connected into a whole through the push rod 14 and the outer ring drill bit base 9 and the inner ring drill bit base 10. In the invention, the edges of the outer ring drill bit base 9 and the inner ring drill bit base 10 are provided with grooves, and the other end of the storage pipe 3 passes through the grooves, so that the inner ring drill bit base and the outer ring drill bit base are staggered from the position of the fracturing pipe storage pipe 3 and axially translate and slide, wherein the size of the grooves is larger than that of the fracturing pipe storage pipe.

As shown in fig. 2, 9, 10, 15, the outer shield assembly includes an outer shield assembly bottom plate 25 and an outer shield assembly top plate 43 and an outer shield assembly side wall 26 for maintaining the interior space. The plate surface of the bottom plate 25 of the outer protection component is provided with 10 bottom plates which are provided with guide holes 22,3 and provided with cameras 23,3 and searchlights 21, the cameras 23 and the searchlights 21 are used for detecting the hole bottom condition, and the bottom plate hole opening guide pipe 22-1 is connected to the bottom plate hole opening 22 and is used for guiding the drill bit 8 to drill holes and ensuring the perpendicularity and stability of the drill bit 8 during drilling. On the other hand, the fixing function is realized by pressing the pile body against the bottom of the hole of the cast-in-place pile. When in work, the bottom plate opening 22 corresponds to the position of the drill bit 8 or the fracturing pipe storage hole 7, and the drill bit 8 and the fracturing pipe storage pipe 3 are sequentially arranged at intervals along an annular shape. The outer protection component top plate 43 is provided with a through hole 39 penetrating through the push rod 14, and the push rod 14 rotates along the center of the top plate to drive the inner and outer top plates and the inner ring components to rotate along the center of the circular ring through the outer side top plate 40, the inner side top plate 41 and the rolling bearing 42 arranged between the outer protection component side wall 26.

As shown in fig. 9 and 11, in the present invention, three bolt holes 24 are formed in the outer protection assembly bottom plate 25 and the outer protection assembly side wall 26, and two rows of four high-strength bolts 30 are designed in each bolt hole.

As shown in fig. 6 and 12, the locking device 31 is located in the top clamping hole 20 of the fracturing pipe, when the fracturing pipe is filled before the pore-forming device works, the storage hole 7 of the fracturing pipe is controlled to be aligned with the opening 22 of the bottom plate on the same central axis, then the top of the fracturing pipe is pushed forward from the opening guide tube 22-1 of the bottom plate and reaches the storage pipe 3 of the fracturing pipe through the opening 22 of the bottom plate, the horizontal buckle 34 is pushed to two sides in the pushing process of the top buckle 33 of the fracturing pipe, when the top buckle 33 of the fracturing pipe slides over the horizontal buckle 34, the spring 36 rebounds the horizontal buckle 34 to reset, the top buckle 33 of the fracturing pipe is clamped, and the locking process of the fracturing pipe 32 is realized. After the drill bit 8 of the pore-forming device drills, the vertical clamping plate 38 is pushed by operating the push rod motor 35 to stretch and retract, the vertical clamping plate 38 drives the horizontal buckles 34 to move to the two sides, and the process of loose landfill of the carbon dioxide cracking tube 32 is achieved. The vertical catches 37 are used to limit the position of the horizontal catches 34.

As shown in fig. 14, the construction method of the hole forming device for the completely weathered granite cast-in-place pile of the invention is as follows:

(1) Leveling and cleaning the site, and positioning the pile position, wherein the deviation of the pile position is less than or equal to 30mm;

(2) Embedding a steel pile casing, checking the verticality of the steel pile casing, and according to the field condition, embedding the steel pile casing with the depth of 1-1.5m and the height of the steel pile casing 30cm above the ground;

(3) Firstly, drilling a hole in a weak stratum by adopting a continuous rotary drilling rig. The rotary drilling rig is in place, a rotary drilling bit is adjusted to a pile position, the verticality of the drill bit is adjusted, and the verticality deviation is ensured to be less than or equal to 1%;

(4) And starting a drilling excavator, drilling a hole by a drill bit in a downward rotary drilling manner, and observing the drilling verticality and the hole forming quality constantly during construction. And after the drilling machine drills to a set depth in a rotary drilling manner, the drill bit stops working and is lifted upwards to pour soil.

(5) And (5) carrying out pile position rechecking and pore-forming inspection to ensure that the pile hole deviation or the pore-forming quality meets the standard requirements.

(6) And (5) repeating the construction steps (4) and (5), stopping working when the rotary drilling rig drills to a certain depth and meets the completely weathered granite stratum, lifting the rotary drilling rig upwards, and moving the rotary drilling rig out of the pile hole.

(7) And (3) filling gas into the carbon dioxide fracturing pipe, wherein before the carbon dioxide fracturing pipe is used, the position of the storage pipe 3 of the fracturing pipe corresponds to the opening 22 of the bottom plate of the outer protection assembly, the electrode of the fracturing pipe and the pore-forming device are checked, and the carbon dioxide fracturing pipe is filled after the electrode and the pore-forming device are checked to be correct. Then the pore-forming device is horizontally placed, the cracking tube 32 is pushed into the cracking tube storage tube 3 through the bottom plate hole-forming guide tube 22-1 of the outer protection component, the cracking tube 32 is fixed through the locking device 31 in the top clamping hole 20 of the cracking tube, and the pore-forming device provided with the cracking tube is installed at the position of a drill bit of a drilling machine through an on-site machine.

(8) Positioning the hole forming device in place and aligning the hole forming device with a pile hole to ensure that the verticality deviation is less than or equal to 1 percent;

(9) Starting the construction machinery, putting the pore-forming device into the pile hole, monitoring the hole bottom condition through the searchlight 21 and the camera 23, and stopping descending when the outer protection component bottom plate perforated guide pipe 22-1 touches the hole bottom of the cast-in-place pile hole.

(10) Because the outer protection component bottom plate open pore 22 corresponds to the fracturing pipe storage pore 7 when the fracturing pipe is installed, the internal structure is rotationally adjusted by the starting device, and the drill bit 8 is aligned to the bottom plate open pore 22. As mentioned above, the outer edge of the outer ring bit seat 9 is evenly provided with 6 bits 8, and the positions of the adjacent bits are distributed at 60 degrees relative to the center of the ring. 3 drill bits are uniformly arranged on the outer edge of the inner ring drill bit base, and the positions of the adjacent drill bits are distributed at 120 degrees relative to the center of the ring. And the drill bits 8 and the fracturing pipe storage pipe 3 are uniformly arranged at intervals, the angle between the drill bits 8 of the outer ring and the fracturing pipe hole is 30 degrees, and the angle between the drill bits 8 of the inner ring and the fracturing pipe hole is 60 degrees. The clamping device 18 is started to fix the outer ring drill bit base 9 and the inner ring drill bit base 10 respectively, meanwhile, the outer base 11 and the inner base 12 in the upper power arm control pushing assembly d rotate 30 degrees and 60 degrees respectively, the whole device is driven to rotate 30 degrees and 60 degrees respectively on the outer ring and the inner ring including the drill bit assembly b, and at the moment, the position of the inner ring drill bit 8 and the position of the outer ring drill bit 8 are aligned to the bottom plate opening hole 22.

(11) And starting the propelling component d and the drill bit motor, and enabling the drill bit 8 to extend out of the bottom plate opening hole 22 through the drill bit guide pipe 1 to drill downwards, wherein the set depth of single drilling is 0.8m in the embodiment, and when the drilling depth reaches the preset depth, stopping drilling. The pusher assembly d is lifted to retract the drill bit 8 into the floor opening 22.

(12) Carry out the inspection of the pore-forming punchhole quality of drill bit 8, the punchhole is qualified back, starts to impel the whole 30 degrees of rotating on the outer ring of subassembly d controlling means structure, rotates 60 degrees on the inner ring, sends to split this moment and store up 3 mouths of pipe and aim at outer protection component bottom plate trompil 22, and the pore-forming punchhole that drill bit 8 bored is aimed at to bottom plate trompil 22.

(13) Burying of carbon dioxide fracturing pipe is carried out, and operating personnel starts locking device 31, and push rod motor 35 starts and promotes vertical cardboard 38 to both sides, and vertical cardboard 38 drives horizontal buckle 34 and moves to both sides, and the buckle loosens, and it puts into the drilling punchhole to send and split Guan An. Preferably, in order to ensure the crushing effect, the outermost eyelet is provided with the one-way fracturing pipe, the air leakage hole of the fracturing pipe is arranged in the inward direction, the rest eyelets are provided with the two-way fracturing pipes, and the central eyelet is not provided with the fracturing pipe. And after the fracturing pipe is placed, the pore-forming device is lifted upwards and moved out of the pile hole.

(14) And (4) filling the drilled hole with fine sand to be compact, and covering the opening of the hole pile with a gun.

(15) And exciting an electrode at the top of the fracturing pipe through a wireless remote control device, and exciting high temperature by the electrode to quickly gasify liquid carbon dioxide gas so as to crush rock strata around the fracturing pipe.

(16) After detonation, after smoke dust is dissipated, a grab crane is used for grabbing and cleaning the broken rock stratum and the fracturing pipe, and hole cleaning and inspection are carried out.

(17) And (5) repeating the construction steps (7) to (16) until the hole forming depth reaches the design depth.

Claims (10)

1. The utility model provides a full morals and manners granite bored concrete pile pore-forming device which characterized in that: comprises a guiding component (a), a drill bit component (b), a fixed rotating component (c), a propelling component (d) and an outer protection component;

the fixed rotating assembly (c) comprises an outer rotating ring (17) and an inner rotating ring (19); the outer rotating ring (17) and the inner rotating ring (19) are distributed with a buckling unit (15) and a pushing hole (16); a clamping hole (20) of the cracking tube is formed in the buckle unit (15), and a locking device (31) for locking and tightening the cracking tube is arranged in the clamping hole (20) of the cracking tube; a clamping device (18) for fixing the drill bit component (b) is arranged on the side surface of the buckling unit (15);

the guide assembly (a) comprises a first rotating ring (2), a second rotating ring (4), a drill bit guide pipe (1) and a storage pipe (3) of a fracturing pipe (32); the guide assembly is connected with the fixed rotating assembly (c) through a storage pipe (3) of the cracking pipe (32); the propelling component (d) is connected with the drill bit component (b) and drives the guide component (a), the drill bit component (b), the fixed rotating component (c) and the propelling component (d) to synchronously rotate under the action of the power arm;

and a plurality of open holes (22) corresponding to the storage pipes (3) of the fracturing pipes (32) or the drill bits (8) of the drill bit assembly (b) are formed in the bottom plate (25) of the outer protection assembly.

2. The fully weathered granite bored pile hole forming device of claim 1, where: the locking device (31) comprises a horizontal buckle (34), a spring (36), a locking assembly and a fracturing pipe landfill assembly; the locking assembly comprises a split tube top end buckle (33), the split tube top end buckle (33) pushes the horizontal buckle (34) to two sides in the jacking process, and the horizontal buckle (34) resets under the action of a spring (36).

3. The fully weathered granite bored pile hole forming device of claim 2, wherein: the fracturing pipe burying and burying assembly comprises a push rod motor (35) and a vertical clamping plate (38), wherein the push rod motor (35) drives a horizontal clamping buckle (34) to move through the vertical clamping plate (38) to bury and bury the fracturing pipe (32).

4. The fully weathered granite bored pile hole forming device of claim 1, where: the drill bit assembly (b) comprises an outer ring drill bit base (9), an inner ring drill bit base (10) and a drill bit (8), wherein grooves for accommodating the fracturing pipe storage pipe are formed in the edges of the outer ring drill bit base (9) and the inner ring drill bit base (10).

5. The fully weathered granite bored pile hole forming device of claim 1, where: the clamping device (18) comprises a supporting plate (18-1), an electric telescopic rod (18-2) and a sliding rail (18-3), and the electric telescopic rod (18-2) drives the supporting plate to extend outwards along the normal direction of the buckle unit (15) to clamp the outer ring drill bit base (9) and the inner ring drill bit base (10).

6. The fully weathered granite bored pile hole forming device of claim 1, where: the propelling component (d) comprises an outer base (11), an inner base (12) and a push rod (14), and the push rod (14) penetrates through a propelling hole (16) to be connected with the outer ring drill bit base (9) and the inner ring drill bit base (10).

7. The fully weathered granite bored pile hole forming device of claim 1, where: the first rotating ring (2) comprises a first inner ring and a first outer ring, the second rotating ring (4) comprises a second inner ring and a second outer ring, and a plurality of guide holes which pass through a drill bit (8) or a fracturing pipe (32) are formed in the first inner ring, the second inner ring, the first outer ring and the second outer ring.

8. The fully weathered granite bored pile hole forming device of claim 1, where: the outer protection assembly further comprises a top plate (43) and a side wall (26), a through hole (39) penetrating through the push rod (14) is formed in the top plate (43), and a rolling bearing is arranged between the top plate and the side wall.

9. A construction method of the completely weathered granite cast-in-place pile hole-forming device as claimed in claim 1, characterized in that: the method comprises the following steps:

(1) Leveling the field, and positioning the pile position, wherein the deviation of the pile position is less than or equal to 30mm;

(2) Embedding a steel pile casing, and checking the verticality of the steel pile casing, wherein the embedding depth of the steel pile casing is 1-1.5m;

(3) Drilling a hole in a weak stratum by adopting a rotary drilling rig, adjusting the rotary drilling rig to a pile position, adjusting the verticality of a drill bit, and ensuring that the verticality deviation is less than or equal to 1%;

(4) Starting a drilling excavator to dig and drill to form a hole in a rotary mode, stopping the drill bit after the drilling excavator drills in the rotary mode to a set depth in a single drilling mode, and lifting upwards to pour soil;

(5) Carrying out pile position rechecking and pore-forming inspection to ensure the deviation of pile pores or the pore-forming quality;

(6) Repeating the steps (4) and (5), stopping working when the rotary drilling rig encounters a completely weathered granite stratum, lifting the rotary drilling rig upwards, and moving the rotary drilling rig out of the pile hole;

(7) Filling carbon dioxide gas into the fracturing pipe, enabling a storage pipe (3) of the fracturing pipe to correspond to the opening (22) of the outer protection assembly bottom plate, and checking an electrode of the fracturing pipe; then, the cracking pipe is pushed into a storage pipe (3) of the cracking pipe through a bottom plate hole opening guide pipe (22-1) of the outer protection assembly, the cracking pipe (32) is locked through a locking device (31) in a clamping hole (20) in the top of the cracking pipe, and the hole forming device with the cracking pipe is installed at the drill bit position of a drilling machine;

(8) Positioning the pore-forming device in place and aligning the pore-forming device with a pile hole to ensure that the verticality deviation is less than or equal to 1 percent;

(9) Starting a construction machine, placing a pore-forming device into a pile hole, monitoring the hole bottom condition of the pile hole through a searchlight and a camera, and stopping descending when a bottom plate pore-forming guide pipe (22-1) of an outer protection assembly touches the bottom of the pile hole of the cast-in-place pile;

(10) Rotating the hole forming device to align the drill bit (8) with the bottom plate opening (22) by: starting a clamping device (18) to fix an outer ring drill bit base (9) and an inner ring drill bit base (10), simultaneously controlling the outer base (11) in the propelling assembly to rotate 30 degrees by a power arm, controlling the inner base (12) to rotate 60 degrees to drive the drill bit assembly to rotate 30 degrees on the outer ring, and aligning the inner ring drill bit and the outer ring drill bit to the bottom plate hole (22) after rotating 60 degrees on the inner ring;

(11) Starting the propelling component and the drill bit motor, enabling the drill bit (8) to extend out of the bottom plate opening hole (22) through the drill bit guide pipe (1) to drill downwards, and stopping drilling when the drilling depth reaches a preset depth; the propelling component is lifted to drive the drill bit to retract into the bottom plate opening (22);

(12) Checking the quality of the hole-forming holes of the drill bit (8), starting the propelling component (d) to control the whole hole-forming device to rotate 30 degrees on the outer ring and 60 degrees on the inner ring after the holes are qualified, aligning the pipe orifice of the fracturing storage pipe (3) to the bottom plate opening (22) of the outer protection component at the moment, and aligning the bottom plate opening (22) to the hole-forming holes drilled by the drill bit;

(13) Burying the fractured pipe, specifically, starting a locking device (31), starting a push rod motor (35) and pushing vertical clamping plates (38) to two sides, driving horizontal clamping buckles (34) to move to two sides by the vertical clamping plates, loosening the horizontal clamping buckles, and putting the fractured pipe Guan An into a drilling hole; lifting the pore-forming device upwards after the fracturing pipe is placed, and moving out of the pile hole;

(14) Filling and compacting the drill hole by using fine sand, and covering the opening of the pile hole by using a gun;

(15) Exciting an electrode at the top of the fracturing pipe through a wireless remote control device, and exciting high temperature by the electrode to gasify liquid carbon dioxide gas so as to crush rock strata around the fracturing pipe;

(16) After detonation, grabbing and cleaning a broken rock stratum and a fracturing pipe by using a crane, and cleaning holes and checking;

(17) And (5) repeating the steps (7) to (16) until the hole forming depth of the cast-in-place pile reaches the design depth.

10. The construction method of the completely weathered granite cast-in-place pile hole-forming device according to claim 9, characterized in that: in the step (13), the unidirectional fracturing tubes are arranged in the outer holes, and the bidirectional fracturing tubes are arranged in the other holes.

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