CN115613577A - Full-rotation full-casing drilling machine and construction method for removing old pile thereof - Google Patents
Full-rotation full-casing drilling machine and construction method for removing old pile thereof Download PDFInfo
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- CN115613577A CN115613577A CN202211644523.0A CN202211644523A CN115613577A CN 115613577 A CN115613577 A CN 115613577A CN 202211644523 A CN202211644523 A CN 202211644523A CN 115613577 A CN115613577 A CN 115613577A
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- 238000010276 construction Methods 0.000 title claims abstract description 66
- 238000005553 drilling Methods 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 112
- 239000010959 steel Substances 0.000 claims abstract description 112
- 239000002689 soil Substances 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
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- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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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 full-rotation full-casing drilling machine and a construction method for removing an old pile thereof. The beneficial effects of the invention are: adopt full gyration casing drill to carry out pile foundation and pull out the construction, this equipment can be under the condition of not destroying peripheral soil body: the construction method can be used for removing underground waste steel concrete structures, removing or replacing pile foundations without leaving, and carrying out enclosure construction of hard occlusion of the bored cast-in-place secant pile.
Description
Technical Field
The invention relates to a full-rotation full-casing drilling machine, in particular to a full-rotation full-casing drilling machine and a construction method for removing an old pile thereof, and belongs to the technical field of pile foundation demolition construction.
Background
In recent years, with the rapid development of domestic economy, the increasing of projects such as urban construction redevelopment projects, old urban area transformation, subway tunnels, underground enclosing structures, bridge reconstruction and extension projects of large and medium-sized cities often meet the problem that underground rocks, residual old concrete structures, old pile foundations and other obstacles need to be removed, and the underground obstacles become troublesome problems in underground engineering construction. The problems that the original underground pile foundation influences the propelling of the shield, the original pile foundation cannot meet the upper load, the grooving of the narrow underground diaphragm wall in the construction field influences the high-rise building by the approach and the like frequently occur in the design and construction process. The method often causes the line changing and the site changing or the redesign of part of construction to be wasted in half way, and directly influences the construction progress and quality of the project, so the work of clearing underground obstacles is very important.
Based on the construction method, the full-rotation full-casing drilling machine and the construction method for removing the old pile are provided.
Disclosure of Invention
The present invention is directed to a full-slewing full casing drilling machine and a construction method for removing an old pile thereof to solve at least one of the above problems.
The invention realizes the purpose through the following technical scheme: a full-rotation full-casing drilling machine comprises a base, a hydraulic hoop system, a steel casing and a hydraulic jacking system;
the base is placed in an area where a pile needs to be drilled, the base is composed of two parallel plates, a hydraulic hoop system is installed in the center of each of the two parallel plates of the base, the two parallel plates of the base are connected through a hydraulic jacking system, and the two hydraulic hoop systems are clamped on a vertically arranged steel sleeve pipe body;
the front end of the base is fixed through a reactive torque lock, the hydraulic hoop system and the hydraulic jacking system both provide hydraulic driving force through a high-pressure oil pipe by a hydraulic driving system, the hydraulic driving system is controlled through an operating panel, a reducing cushion block is further arranged between the hydraulic hoop system and the pipe wall of the steel sleeve, a level indicator is mounted on the base, and the hydraulic hoop system and the hydraulic jacking system are both connected with a pressure indicator;
a construction method for removing an old pile of a full-rotation full-casing drilling machine comprises the following steps:
firstly, construction preparation, namely placing and fixing a positioning steel plate at a hole site needing obstacle clearing, forming a hole in the center of the positioning steel plate, accurately coinciding the center of the hole site needing obstacle clearing, mounting a full-rotation full-casing drilling machine on the positioning steel plate, and checking the displacement and hoisting capacity of the full-rotation full-casing drilling machine;
determining the pile position, wherein accurate positioning of a pile body is the key for successful pile pulling, accurate coordinates of the pile position cannot be determined by exploring and digging under the condition that a pile foundation is buried deeply, positioning and paying off can only be carried out through original drawing coordinates, and an old pile cap is dug by using a digging machine and a gun machine to find the pile position under the condition that site information is incomplete and the pile body cannot be accurately positioned;
thirdly, positioning the full-circle-rotation full-casing drilling machine, after laying steel plates, moving the full-circle-rotation drilling machine to position, adjusting the level and the verticality of the drilling machine to enable the center of a steel casing pipe configured by the drilling machine to be consistent with the center of the embedded outer steel casing pipe, and rechecking to perform cutting and obstacle clearing;
fourthly, the steel sleeve is rotated, cut and drilled, the full slewing drilling machine drives the steel sleeve to rotate, cut and drill to sink, the pile is separated from the surrounding soil body until the pile sinks to a preset depth, and after the steel sleeve sinks to the preset depth, the pile body is twisted off and is rotated to lift out the broken pile;
and fifthly, backfilling the pile hole, removing the steel sleeve and backfilling cement soil while removing the steel sleeve after the pile is completely removed, and simultaneously filling the cement soil to the bottom of the pile hole after the steel sleeve is completely removed.
As a still further scheme of the invention: in the first step, the four positioning base points of the placed positioning steel plate are all located at the center of the roadbed plate, the hole site center of the positioning steel plate can be determined through two thin wires, and the hole site center can be coincided with the hole site center needing to be cleared, which is measured in advance, when the hole site center is placed.
As a still further scheme of the invention: in the first step, when the full-rotation full-casing drilling machine is installed, the four supporting legs are all placed into the four base points of the positioning steel plate, after the four supporting legs are placed in place, the verticality of the drilling machine is determined through a vertical monitoring system or a total station of the drilling machine, and the drilling machine is placed horizontally by adjusting the four supporting leg oil cylinders.
As a still further scheme of the invention: in the second step, the method specifically comprises the following steps:
(1) a long-arm excavator digs a pile head. Excavating the position influencing the construction of the newly designed engineering pile by using a long-arm excavator according to the grasped data, exposing the old pile head, determining the coordinates of the pile position, then backfilling immediately, and removing the part of the old pile by using a full-rotation full-casing drilling machine;
(2) if the long-arm excavator cannot dig out the old pile body due to the fact that the site geological condition is poor and holes are prone to collapse, the long-arm excavator is used at the position of a newly designed engineering pile which possibly meets the old pile densely, 1500 sleeves are used firstly, the distance between every two adjacent piles is 1200, an occlusive pile is constructed, the position of the old pile is detected, and dense original soil is backfilled.
As a still further scheme of the invention: and in the fourth step, when the steel sleeve is rotated, cut and cut, the serrated tungsten steel cutter head is embedded at the bottom end of the steel sleeve, and the steel sleeve is pressed into the steel sleeve in a 360-degree rotating manner under the driving of a rotating driving device, so that the steel sleeve can be cut and penetrated together even if other obstacles exist around the pile body.
As a still further scheme of the invention: and in the fourth step, after the steel sleeve is rotated and sunk into the preset pile body depth, a clamping rod is placed between the pile body and the steel sleeve so as to forcibly twist off the pile body and lift out the twisted off pile body.
As a still further scheme of the invention: and in the fourth step, in the rotation process of the steel sleeve, a special anti-torque lock is arranged for preventing the machine body from rotating together with the steel sleeve to clamp the machine body. The driving device can arbitrarily adjust the rotation torque, rotation speed, pressing force and clamping force of the steel sleeve within the working capacity range of the equipment, the rotation speed is set to be high, medium and low, the optimum rotation speed can be selected according to the diameter of the steel sleeve, geological conditions, the change condition of the torque and the like,
as a still further scheme of the invention: in the process of the rotation of the steel sleeve, a special hydraulic loop is adopted for a horizontal adjusting oil cylinder of the full-rotation full-sleeve drilling machine so as to ensure the stability of the full-rotation full-sleeve drilling machine and further adjust the verticality of the steel sleeve during the rotation of the steel sleeve.
The beneficial effects of the invention are: adopt full gyration casing drill to carry out pile foundation and pull out the construction, this equipment can be under the condition of not destroying peripheral soil body: the underground waste steel concrete structure is removed, the pile foundation is not pulled out or replaced, and the enclosure construction of hard occlusion of the bored cast-in-place secant pile can be carried out, so that the construction method realizes the possibility that the civil engineering technicians can carry out cast-in-place pile, replacement pile, underground continuous wall, pipe jacking and shield tunnel barrier-free penetration of various pile foundations under the condition that barriers such as a conglomerate stratum, various pile foundations, a reinforced concrete structure and the like are not removed completely;
the full-rotation full-casing drilling machine adopts the casing to cover the pile body for cutting operation, the strong rotation torque of the casing can twist off the pile body, and the pile body is taken out by the flushing grab bucket, so that the full-rotation full-casing drilling machine has the following advantages:
(1) The construction method for removing obstacles and pulling piles in full-rotation is safe and reliable, has small disturbance on the soil body, carries out obstacle removing and pile pulling and backfilling construction in the steel sleeve, does not damage or has small damage on the original underground soil, and does not generate disturbance or generates small disturbance on the underground soil body. Due to the support of the steel sleeve on the hole wall, when the soil stress at the periphery of the steel sleeve is not released, the barrier is removed and backfilled in time, and the structure at the periphery is not influenced;
(2) The construction speed is fast, the quality is high, and application scope is extensive. The construction method can carry out various pile pulling and obstacle removing constructions according to engineering requirements, such as old cast-in-situ bored piles, precast piles, prestressed pipe piles, underground residual old reinforced concrete, block stones and other obstacles with various forms, specifications, complex environment and various difficulties;
(3) The risk is little, guarantee follow-up engineering construction. The full-rotation obstacle-removing and pile-pulling construction method can cut obstacles and remove obstacles or completely pull out old piles, and can smoothly achieve the construction purpose under general conditions. Even if special conditions are met, the crawler crane is adopted to hang the small hydraulic grab bucket to enter the steel sleeve to grab out the rest broken piles or obstacles, and 100% of the situation ensures that the obstacles are thoroughly cleared;
(4) The construction method is energy-saving, environment-friendly, high-quality and high-efficiency, no slurry is generated in the pile pulling process, the construction equipment is low in noise and high in construction speed, and the construction quality can be guaranteed;
(5) The construction method has the advantages that the construction method is rapid and economical, the construction cost is reduced, the obstacle clearing and pile pulling are realized by cutting and cutting the steel sleeve in a 360-degree rotation mode, the limitation of environmental factors is small compared with other construction methods, other auxiliary facilities are not required to be added, the obstacle clearing and pile pulling construction efficiency is high, the risk is low, and good economic benefits are achieved.
Drawings
FIG. 1 is a schematic view of the construction process of the present invention;
FIG. 2 is a schematic view of a full-swing all-casing drill according to the present invention.
In the figure: 1. the hydraulic pressure staple bolt system of base, 2, 3, steel casing pipe, 4, hydraulic pressure jacking system, 5, hydraulic drive system, 6, high pressure fuel pipe, 7, operation panel, 8, level indicator, 9, pressure indicating instrument, 10, reducing cushion, 11, reaction torque lock.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
As shown in fig. 2, a full-slewing full casing drilling machine comprises a base 1, a hydraulic hoop system 2, a steel casing 3 and a hydraulic jacking system 4;
the base 1 is placed in an area needing pile drilling, the base 1 is composed of two parallel plates, a hydraulic hoop system 2 is installed in the center of each of the two parallel plates of the base 1, the two parallel plates of the base 1 are connected through a hydraulic jacking system 4, and the two hydraulic hoop systems 2 are clamped on a pipe body of a vertically arranged steel sleeve 3;
the front end of base 1 is fixed through anti-torque lock 11, hydraulic pressure staple bolt system 2 and hydraulic pressure jacking system 4 provide hydraulic drive power through high pressure fuel pipe 6 by hydraulic drive system 5, hydraulic drive system 5 controls through operation panel 7, still be provided with reducing cushion 10 between the pipe wall of hydraulic pressure staple bolt system 2 and steel casing pipe 3, install level indicator 8 on the base 1, hydraulic pressure staple bolt system 2 and hydraulic pressure jacking system 4 all are connected with pressure indicating instrument 9.
Example two
As shown in fig. 1, a full-rotation full-casing drilling machine, taking a pile foundation with a pile diameter of 1.0m to be pulled out as an example, selects a large-torque (3760kn.m, 4300kn.m instant) DTR 2005H-type full-rotation drilling machine to perform pile pulling construction, and the DTR 2005H-type full-rotation casing drilling machine is mainly configured with a host machine of the DTR 2005H-type full-rotation casing drilling machine, sleeves with corresponding types and numbers, a hydraulic power station, an operation room, a counter weight, a road substrate, a positioning steel plate, a punching grab bucket, a counter fork, a wedge-shaped hammer and a cross-shaped punching hammer. Besides, 100t of machinery such as a crawler crane, an excavator, a high-pressure cleaning machine and the like is required to be matched for construction. Utilize the lower pressure and the moment of torsion that full slewing equipment produced when the operation, the drive steel sleeve pipe rotates, and sleeve pipe length has: 10m, 8m, 6m and 4 m. The knife barrel is 1.5m long, a knife head is arranged at the pipe orifice, the middle of other sleeves is a barrel body, and two ends are telescopic joints. The joint is provided with a screw hole and a shear key, and two adjacent sections are connected by a bolt and the shear key to transfer load. The construction method comprises the following steps of cutting obstacles such as soil bodies, rock stratums, reinforced concrete and the like by utilizing a high-strength cutter head at a pipe opening, drilling a sleeve into the ground to the bottom of a pile, grabbing cut broken piles by a grab bucket while gradually drilling a steel sleeve, backfilling by adopting plain concrete or stirring flowable cement soil after clearing is finished, and pulling out the steel sleeve section by section at the same time, wherein the construction method for pulling out the old pile comprises the following steps:
firstly, construction preparation, namely placing and fixing a positioning steel plate at a hole site needing obstacle clearing, forming a hole in the center of the positioning steel plate, accurately coinciding the center of the hole site needing obstacle clearing, mounting a full-rotation full-casing drilling machine on the positioning steel plate, and checking the displacement and hoisting capacity of the full-rotation full-casing drilling machine;
wherein the weight of the full rotary drilling machine is 46t, and a 100t crawler crane is adopted for hoisting and shifting. 22m crawler crane climbing rods, 8m working radius and 65.9t lifting capacity, Q is more than or equal to Q1+ Q2, namely 65.9/46=1.43 > 1, and 100 tons of crawler cranes are selected to meet the construction requirements;
determining a pile position, wherein accurate positioning of a pile body is a key for successful pile pulling, and for the condition that a pile foundation is buried deeply, accurate coordinates of the pile position cannot be determined by exploring excavation, positioning and paying off can only be performed through coordinates of original drawings, and for the condition that site information is incomplete and the pile body cannot be accurately positioned, an old cushion cap is dug by using a digging machine gun to find the pile position;
thirdly, positioning a full-rotation full-casing drilling machine, moving the full-rotation drilling machine to position after laying a steel plate, adjusting the level and the verticality of the drilling machine to ensure that the center of a steel casing configured by the drilling machine is consistent with the center of the embedded outer steel casing, and re-checking again to cut and remove obstacles;
fourthly, the steel sleeve is rotated, cut and drilled, the full slewing drilling machine drives the steel sleeve to rotate, cut and drill to sink, the pile is separated from the surrounding soil body until the pile sinks to a preset depth, and after the steel sleeve sinks to the preset depth, the pile body is twisted off and is rotated to lift out the broken pile;
the single-pile pulling resistance calculation formula: selected from < < technical Specification of building pile foundation >)
T d Single pile pull out resistance
K-safety factor (calculating limit resistance to plucking 1)
λ i Resistance to plucking coefficient (0.75 is taken according to the analysis of the resistance to plucking coefficients of 3-3 layers, 3-5 layers, 3-6 layers, 3-7 layers, 6-1 layer, 7-2 layer and 12-4 layers in geological reports)
f s Pile circumference friction limit value: (Value of maximum frictional force according to geological report soil layer)
U p Pile surface area
L i Pile length
K 1 -empirical coefficients
W-weight of part of pile body to be pulled out
Pile circumference friction force T 1 =1×（3.14×1）×（0.75×35×35）=2885KN
Post-pile-periphery-separation friction force (dry-surface friction coefficient of 0.45 and wet-surface friction coefficient of 0.35) T 2 =0.35×T 1 =1009.7KN
Pile body dead weight W 1 = 3.14×0.5×0.5×35×25=686KN
The part of soil body on the peripheral zone of the pile is calculated according to experience
W 2 =(3.14×0.752×35-3.14×0.52×35)×18=618KN
T d = T2+W1+W2=1009.7+686+618=2315KN
In actual construction, a DTR2005H type full-rotation drilling machine with large torque (3760 KN/m and 4300KN/m instantly) is selected for pile pulling construction, and the cutting length of a pile body is 7-10m, so that the pile body meets the requirement.
And fifthly, backfilling the pile hole, removing a steel sleeve with the diameter of 1.5m after the pile is completely removed, backfilling cement soil, mixing 7% cement in the soil before filling the soil by adopting cohesive soil with better plasticity, and filling the cement soil to the bottom of the pile hole simultaneously after the steel sleeve is completely removed. In the backfilling process, sampling cement soil to prepare a test block, and checking the strength of the test block.
The earthwork is selected to be not more than 5cm blocks, not more than construction waste and other admixtures, and the cement is ordinary Portland cement of more than 32.5; the cement soil is used along with stirring, the digging machine is adopted to stir evenly during stirring, the phenomenon of cement block stacking is not generated, and the strength is controlled to be about 0.5 mPa. The cement soil must be used before the initial setting of the cement after being stirred, and the impact hammer of a full-rotation drilling machine must be used for tamping for a plurality of times after every backfilling for 2-3 m, so as to ensure the backfilling to be compact.
EXAMPLE III
In addition to all the technical features of the second embodiment, the present embodiment further includes:
the four positioning base points of the placed positioning steel plate are all located at the center of the roadbed plate, the hole site center of the positioning steel plate can be determined through two thin lines, and the four positioning base points coincide with the hole site center needing to be cleared when placed.
When the full-rotation full-casing drilling machine is installed, the four supporting legs are all placed into the four base points of the positioning steel plate, after the four supporting legs are placed in place, the verticality of the drilling machine is determined through a vertical monitoring system or a total station of the drilling machine, and the drilling machine is placed horizontally by adjusting the four supporting leg oil cylinders.
Example four
In addition to all the technical features of the second embodiment, the present embodiment further includes:
in the second step, the method specifically comprises the following steps:
(1) the long-arm excavator digs a pile head. Excavating the position influencing the construction of the newly designed engineering pile by using a long-arm excavator according to the grasped data, exposing the old pile head, determining the coordinates of the pile position, then backfilling immediately, and removing the part of the old pile by using a full-rotation full-casing drilling machine;
(2) if the long-arm excavator cannot dig out an old pile body due to poor site geological conditions and easy hole collapse, the long-arm excavator is used for a newly designed engineering pile position which is likely to intensively meet the old pile, 1500 sleeves are firstly used, the distance between every two adjacent piles is 1200, an interlocking pile is constructed, the position of the old pile is found out, and a dense original soil body is backfilled.
When the steel sleeve is rotated, cutting is carried out, the serrated tungsten steel cutter head is embedded at the bottom end of the steel sleeve, the steel sleeve is driven by the rotation driving device to be pressed in a 360-degree rotation manner, and even if other obstacles exist at the periphery of the pile body, the steel sleeve can be cut and penetrated together.
EXAMPLE five
In addition to all the technical features of the second embodiment, the present embodiment further includes:
after the steel sleeve is rotated and sunk into the preset pile body depth, a clamping rod is placed between the pile body and the steel sleeve, so that the pile body is forcibly twisted off, and the twisted off pile body is lifted out.
In the process of rotating the steel sleeve, a special anti-torque lock is arranged for preventing the machine body from rotating along with the steel sleeve to clamp the machine body. The driving device can arbitrarily adjust the rotation torque, rotation speed, pressing force and clamping force of the steel sleeve within the working capacity range of the equipment, the rotation speed is set to be high, medium and low, the optimum rotation speed can be selected according to the diameter of the steel sleeve, geological conditions, the change condition of the torque and the like,
in the process of rotating the steel sleeve, a special hydraulic loop is adopted for a horizontal adjusting oil cylinder of the full-rotation full-sleeve drilling machine so as to ensure the stability of the full-rotation full-sleeve drilling machine and further adjust the verticality of the steel sleeve when the steel sleeve rotates.
The working principle is as follows: the construction machine can drive the steel sleeve to rotate for 360 degrees and press and pull the steel sleeve in and out. The equipment generates downward pressure and torque during operation, drives the steel sleeve to rotate, utilizes the high-strength tool bit at the pipe opening to cut obstacles such as soil bodies, rock stratums, reinforced concrete and the like, utilizes the wall protection function of the sleeve, then uses the hydraulic pressure to grab out the objects in the steel sleeve by the grab bucket, and carries out obstacle clearing and pile pulling operation in the sleeve. And after the obstacles are removed, performing backfill construction in the steel sleeve. The backfill soil can be backfilled by undisturbed soil or other materials required by design. The casing was pulled out while backfilling. And about 3m of the upper part of the brick is backfilled with brick slag and compacted to meet the requirement of subsequent construction and ensure the safety of the subsequent construction.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a full-circle swinging casing drill which characterized in that: the device comprises a base (1), a hydraulic hoop system (2), a steel sleeve (3) and a hydraulic jacking system (4);
the base (1) is placed in an area where a pile needs to be drilled, the base (1) is composed of two plates which are arranged in parallel, the centers of the two parallel plates of the base (1) are respectively provided with a hydraulic hoop system (2), the two parallel plates of the base (1) are connected through a hydraulic jacking system (4), and the two hydraulic hoop systems (2) are clamped on a pipe body of a steel sleeve (3) which is arranged vertically;
the front end of base (1) is fixed through reaction torque lock (11), hydraulic pressure staple bolt system (2) and hydraulic pressure jacking system (4) provide hydraulic drive power through high pressure fuel pipe (6) by hydraulic drive system (5), hydraulic drive system (5) are controlled through operation panel (7), still be provided with reducing cushion (10) between the pipe wall of hydraulic pressure staple bolt system (2) and steel casing pipe (3), install level indicator (8) on base (1), hydraulic pressure staple bolt system (2) and hydraulic pressure jacking system (4) all are connected with pressure indicating instrument (9).
2. An old pile pulling construction method based on the full-rotation full-casing drilling machine as claimed in claim 1, characterized in that: the construction method for removing the old pile comprises the following steps:
firstly, construction preparation, namely placing and fixing a positioning steel plate at a hole site needing obstacle clearing, forming a hole in the center of the positioning steel plate, accurately coinciding the center of the hole site needing obstacle clearing, mounting a full-rotation full-casing drilling machine on the positioning steel plate, and checking the displacement and hoisting capacity of the full-rotation full-casing drilling machine;
determining the pile position, wherein accurate positioning of a pile body is the key for successful pile pulling, accurate coordinates of the pile position cannot be determined by exploring and digging under the condition that a pile foundation is buried deeply, positioning and paying off can only be carried out through original drawing coordinates, and an old pile cap is dug by using a digging machine and a gun machine to find the pile position under the condition that site information is incomplete and the pile body cannot be accurately positioned;
thirdly, positioning a full-rotation full-casing drilling machine, moving the full-rotation drilling machine to position after laying a steel plate, adjusting the level and the verticality of the drilling machine to ensure that the center of a steel casing configured by the drilling machine is consistent with the center of the embedded outer steel casing, and re-checking again to cut and remove obstacles;
fourthly, the steel sleeve is rotated, cut and drilled, the full slewing drilling machine drives the steel sleeve to rotate, cut and drill to sink, the pile is separated from the surrounding soil body until the pile is sunk to a preset depth, and the steel sleeve is screwed off the pile body after being sunk to the preset depth and rotated to lift out the broken pile;
and fifthly, backfilling the pile hole, removing the steel sleeve and backfilling cement soil at the same time after the pile is completely removed, and simultaneously filling the cement soil to the bottom of the pile hole after the steel sleeve is completely removed.
3. The construction method for removing an old pile according to claim 2, wherein: in the first step, the four positioning base points of the placed positioning steel plate are all located at the center of the roadbed plate, the hole site center of the positioning steel plate can be determined through two thin wires, and the hole site center can be superposed with the hole site center needing to be cleared, which is measured in advance.
4. The construction method for removing the old pile according to claim 2, wherein: in the first step, when the full-circle-rotation full-casing drilling machine is installed, the four supporting legs are all placed into the four base points of the positioning steel plate, after the four supporting legs are placed in place, the verticality of the drilling machine is determined through a vertical monitoring system or a total station of the drilling machine, and the drilling machine is placed horizontally by adjusting the four supporting leg oil cylinders.
5. The construction method for removing an old pile according to claim 2, wherein: in the second step, the method specifically comprises the following steps:
(1) digging a pile head by using a long-arm digging machine, digging a position influencing the construction of the newly designed engineering pile by using the long-arm digging machine according to the grasped data, exposing the old pile head, determining a pile position coordinate, then immediately backfilling, and removing the old pile by using a full-rotation full-casing drilling machine;
(2) if the long-arm excavator cannot dig out the old pile body due to the fact that the site geological condition is poor and holes are prone to collapse, the long-arm excavator is used at the position of a newly designed engineering pile which possibly meets the old pile densely, 1500 sleeves are used firstly, the distance between every two adjacent piles is 1200, an occlusive pile is constructed, the position of the old pile is detected, and dense original soil is backfilled.
6. The construction method for removing an old pile according to claim 2, wherein: in the fourth step, when the steel sleeve is rotated, cut and cut, the serrated tungsten steel cutter head is embedded at the bottom end of the steel sleeve, and the steel sleeve is pressed in a 360-degree rotating manner under the driving of the rotating driving device, so that the steel sleeve can be cut and penetrated together even if other obstacles exist around the pile body.
7. The construction method for removing the old pile according to claim 2, wherein: and in the fourth step, after the steel sleeve is rotated and sunk into the preset pile body depth, a clamping rod is placed between the pile body and the steel sleeve so as to forcibly twist off the pile body and lift out the twisted off pile body.
8. The construction method for removing an old pile according to claim 2, wherein: in the fourth step, in the steel sleeve rotation process, the machine body is clamped by a special anti-torque lock which is arranged for preventing the machine body from rotating along with the steel sleeve, the rotation torque, the rotation speed, the pressing force and the clamping force of the steel sleeve can be adjusted randomly by the driving device within the working capacity range of the equipment, the rotation speed is high, medium and low, and the optimum rotation speed can be selected according to the change conditions of the diameter, the geological condition and the torque of the steel sleeve and the like.
9. The construction method for removing an old pile according to claim 8, wherein: in the process of the rotation of the steel sleeve, a special hydraulic loop is adopted for a horizontal adjusting oil cylinder of the full-rotation full-sleeve drilling machine so as to ensure the stability of the full-rotation full-sleeve drilling machine and further adjust the verticality of the steel sleeve during the rotation of the steel sleeve.
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Application publication date: 20230117 |