CN114960626A - Positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method - Google Patents
Positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 156
- 238000004140 cleaning Methods 0.000 title claims abstract description 53
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 226
- 238000000034 method Methods 0.000 claims abstract description 101
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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Abstract
The construction method for forming the hole of the pile with the hole cleaning, drilling and expanding disc in one step by positive and negative bidirectional circulation sequentially comprises the following steps: the construction site tee joint is flat, the pile hole position is lofted, the pile casing is embedded, the mud ditch and the mud pool are arranged, water is injected into the pile casing, the mud ditch and the mud pool, the drilling machine is in place, centered and leveled, and water is injected into the pile casing before drilling, so that the construction site tee joint has the advantages that: the method adopts a slurry pump positive circulation process in the drilling operation of the hole opening section, can furthest utilize the natural stratum soil mass on the upper part of the drilling hole to manufacture the wall protection slurry, can cut the stratum soil mass into more finely-divided sediments, can manufacture more slurry more efficiently, is favorable for improving the quality of the slurry and enhancing the wall protection effect of the slurry, the running state of a drill rod, related display data and the like become reliable basis for a drilling machine operator to control the drilling machine, and compared with the positive circulation of the slurry, the method has the advantages that the proportion of the circulating slurry in a pile hole is smaller, the viscosity is lower, the sand content is smaller, the sediments at the bottom of the hole are less, and therefore, the one-time hole cleaning operation can be omitted after the hole is formed.
Description
Technical Field
The invention relates to a drilling and expanding disc pile construction technology, in particular to a hole forming construction method for a drilling and expanding disc pile by one-time hole cleaning in a forward and reverse bidirectional circulation mode.
Background
In the field of existing pile foundation engineering construction, the variable-diameter cast-in-place pile is concerned by the advantages of high single-pile bearing capacity, engineering quantity saving and engineering cost saving. However, the existing construction method of the reducing cast-in-place pile has many disadvantages, so that the construction of the reducing cast-in-place pile mostly stays at a theoretical level, and is difficult to popularize and apply in actual construction, and the method specifically comprises the following steps:
firstly, the existing construction method of variable-diameter pouring needs to carry out hole cleaning twice, namely, after hole forming, the hole cleaning needs to be carried out for the first time, and after a reinforcement cage and a pouring guide pipe are placed downwards, the hole cleaning needs to be carried out for the second time. In addition, in the construction process, the drilling and reaming device is lifted out of the drilled hole after three procedures of drilling, reaming and cleaning the hole for the first time are finished. However, the operation steps are increased by cleaning the holes twice, the construction cost is increased, more serious, because the hole forming construction time is prolonged, hole accidents are possibly caused, the drilling and expanding disc device is buried in the pile hole, in case of the above situation, the property loss of the drilling and expanding disc device is caused, the site selection is needed again for drilling and expanding the disc, time and labor are wasted, the integral scheme of the original building design is influenced, and the loss is difficult to measure.
Secondly, in the construction method of the existing reducing cast-in-place pile, the hole cleaning needs to be carried out for the first time after the hole is formed, and the hole cleaning needs to be carried out for the second time before the concrete is cast so as to enable the pile hole to reach the set depth and diameter. The mud circulation mode adopted for replacing the sediments generated by cutting in the pile hole out of the pile hole is a single mode, namely, only the positive circulation of the mud is adopted in the construction process, or only the reverse circulation of the mud is adopted. The sediment inefficiency of single mud positive cycle mode of using, the pore-forming footage is slow, is difficult to satisfy the construction requirement of reducing bored concrete pile, and single mud reverse cycle mode of adopting still can appear the condition of the easy hole that collapses of stake hole because of the mud dado effect is poor though the pore-forming footage has promoted.
Disclosure of Invention
The invention aims to provide a hole forming construction method for a hole cleaning, drilling and expanding disc pile with positive and negative bidirectional circulation, which adopts slurry positive circulation firstly in a hole forming stage and is matched with low-footage drilling construction operation, so that the granularity of sediment generated by drilling is smaller, the effect of quickly preparing wall protection slurry to reinforce a hole wall is realized while drilling, the drilling with high verticality and high hole wall stability is easy to form under the working condition of low-footage drilling, and extremely favorable conditions are created for subsequent hole forming construction; and then, the slurry is converted into slurry reverse circulation, and drilling or disc expanding is carried out in a high-footage mode, so that the granularity of sediments generated by pore forming is larger, less waste slurry is generated, and the adverse effect on the natural environment is effectively reduced. Keeping mud concentration unchangeable basically, and being enough to maintain under the stable prerequisite of pore wall, deposit in the mud pit with drilling and the produced sediment replacement of expansion dish high-efficiently, need not clear hole and directly transfer the steel reinforcement cage and fill the pipe after the pore-forming, the construction overall process only needs once clear hole alright reach the effect of designing requirement, thereby can realize labour saving and time saving, reduction in production cost and construction risk by a wide margin, and then can solve two problems that the prior art exists simultaneously.
The technical scheme adopted by the invention for solving the technical problems is as follows: for simplicity and convenience of description, the drilling gear of the drilling and expanding disk device can be called a first gear, and the rotating and expanding disk gear of the drilling and expanding disk device can be called a second gear.
The construction method for forming the hole of the pile with the hole cleaning, drilling and expanding disc in one step by positive and negative bidirectional circulation sequentially comprises the following steps of: the tee bend of construction site is flat, and pile hole position lofting buries underground and protects a section of thick bamboo, sets up mud ditch and mud pond, to protecting a section of thick bamboo, water injection in mud ditch and the mud pond, the rig takes one's place, centering, flattening, should be to protecting a section of thick bamboo water injection before opening the brill, follow-up in proper order according to the following step operation:
s1: opening a hole: enabling the drill bit tip of a drilling and expanding disc device of the drilling machine to vertically point to the center of a drilling hole in the protective cylinder, operating the drilling machine to start a slurry pump positive circulation system, and enabling the drill bit to rotate to cut sediment generated by stratum soil bodies to be further fused with water or slurry to form wall protection slurry in a first gear state; the drilling operation of the hole opening section and the hole blocking section adopts a slurry pump positive circulation process to carry out slow footage, so that the drilling can be more vertical, the slurry can more easily protect the hole wall, and more wall protection slurry can be produced by utilizing the natural stratum soil body on the upper part of the drilling to the maximum extent; the mud positive circulation means that the movable pump device is started, and water or mud on the upper part of the mud pit is injected to the bottom of a pile hole through a mud inlet pipe, a sand pump, a mud outlet pipe, a mud conveying pipe of a drilling machine, a sand pump and a drill rod in sequence; the mud at the bottom of the hole supports the floating sediment, flows upwards to the hole opening of the pile hole in an annular cavity between the drill rod and the wall of the pile hole, and then flows into a mud tank through a mud ditch to be precipitated; the mud on the upper part of the mud pool is sucked by the sand pump through the mud inlet pipe and is re-injected to the bottom of the drilled hole according to the path, and the mud is circularly reciprocated in such a way to continuously replace sediment from the bottom of the hole to the mud pool for sedimentation, so that the method is also called as a positive circulation hole forming construction process of the mud pump. In the whole circulation process, the slurry is injected from the bottom of the pile hole, flows upwards along the inside of the pile hole to the orifice and overflows outwards; the drilling construction at the hole opening stage is preferably carried out by adopting a slow-footage operation method, so that the stratum soil body can be cut into more finely-divided sediments, the sediments are easier to be dissolved with water, and sufficient wall protection slurry can be efficiently manufactured; and simultaneously, the hole wall is favorably reinforced. The sand pump can be selected from GF series sand pumps produced by Hebei national peak heavy industry machinery Limited.
The positive circulation pore-forming construction of the slurry pump is implemented by matching a drilling and expanding disk drilling machine and a mobile mechanical pump device, wherein a slurry outlet pipe of the mobile mechanical pump device and a slurry conveying pipe of the drilling machine can be connected in a quick joint mode, so that the time is saved. In the mud positive circulation, a sand pump on the drilling machine is only used as a part of a mud circulation channel and does not operate per se, namely, a mud conveying pipe, a sand pump and a drill rod of the existing drilling machine only play a role of a channel in the mud pumping positive circulation, and the power of the positive circulation is provided by a sand pump of the mobile machine pump device.
The slurry pump pumping reverse circulation pore-forming construction is implemented by a drilling and expanding disc drilling machine, is irrelevant to a mobile mechanical pump device, and when reverse circulation is needed, a slurry outlet pipe of the mobile mechanical pump device is separated from a slurry conveying pipe of the drilling machine, and a sand pump of the drilling machine is started to provide power for reverse circulation. At the moment, the mobile mechanical pump device can be matched with other drilling machines to form a slurry positive circulation system, can also be matched with another filling guide pipe in a pile hole completing S6 to clean sediment at the bottom of the hole, can also be used for independently regulating and controlling the amount of slurry in a slurry pool, and can even be used as a water pump and the like. The movable pump device has the advantages of being simple in structure, convenient to move, small in size, light in weight, large in pump amount, high in work efficiency, flexible to move and the like, multiple purposes and multiple functions of the movable pump device can be achieved, the movable pump device can be matched with a plurality of drilling machines with different construction schedules to be constructed, and the movable pump device can be used between different pile holes alternately, so that the use efficiency is maximized, and the construction cost can be greatly reduced. Moreover, the method for alternately inserting and operating among a plurality of pile holes by adopting one mobile pump device is also a great innovation highlight of the invention.
S2: and (3) pore-forming construction: when the drilling depth reaches five to eight times of the aperture of the pile hole, changing the mud forward circulation mode into a mud reverse circulation mode, and continuously drilling and expanding the disc by using the drilling machine; the mud reverse circulation refers to that: starting a sand pump on a drilling machine, discharging the mud and sediments at the bottom of a pile hole to a mud pool through a drill rod suction port positioned in the center of the bottom of the pile hole, and precipitating the mud and sediments, wherein the mud at the upper part of the mud pool flows back into the drilling hole through a mud ditch, and the mud circularly reciprocates in such a way to continuously replace the sediments from the bottom of the hole to the mud pool for precipitating, so that the method is called a mud pump suction reverse circulation pore-forming construction process;
when the drilling and expanding disc device is drilled to the set depth of the first expanding disc, the drilling and expanding disc device is switched to an expanding disc gear position to expand discs, at the moment, a drill bit of the drilling and expanding disc device does not rotate, a rotary expanding arm is gradually expanded and rotates along with an outer tube of the drilling and expanding disc device, and at the moment, the drill bit plays a supporting role in rotation; in the rotating process, the rotary expansion arm cuts the hole wall to expand the hole diameter until the drilling and expanding disc device is expanded to the maximum extent, and one disc expanding operation is completed to form an expanded disc; then, the rotary expansion arm is retracted and reset, the drilling and expanding disc device is switched to a drilling gear again, at the moment, the drilling and expanding disc device drives the drill bit to continue to rotate for drilling, and the depth of the pile hole is extended downwards;
when the drilling is carried out to the set depth of the second expansion disc, the drilling and expansion disc device is switched to the expansion disc gear again to expand the discs, after the disc expansion operation is completed, the drilling and expansion disc device is switched to the drilling gear again to drill holes, the operation is circulated in such a way, and when the pile holes reach the set depth, hole construction is finished; in this step, when all drilling and expand the dish operation, all adopt the mud pump to inhale reverse circulation technology, simultaneously, the drill bit drilling and the rotation direction that the arm expanded the dish soon keep unanimous, avoid the maloperation: because the drill rods need to be connected by threads for connection strength requirement and sealing, if the rotation directions of the drill holes and the expansion disks are not consistent, huge rotation torque is easy to fall off at the joint connection part of the drill rods, and the drilling and expansion disk device is retained in a pile hole, and is difficult to take out and only needs to be buried on site, so that the construction cost is greatly increased, and the construction period is prolonged;
when special requirements are met on the expansion disc, the drilling gear and the expansion disc gear are frequently and alternately operated, the expansion disc height and the disc edge thickness can be gradually increased to the design requirements, and the shearing strength and the bearing capacity of the concrete expansion disc are improved. However, in order to make the edge of the expanded disk cavity formed by construction regular and smooth, the expanded disk height and the thickness of the disk edge which are increased by each alternate operation of the gears are controlled not to exceed the thickness of the rotary expanded arm, and a slurry pump reverse circulation system normally operates during the process.
S3: the drilling machine moves away from the pile hole: after the hole forming construction of the drilling machine is finished, hole cleaning construction is not required, but the drilling machine and the drilling and expanding disc device are directly lifted out of an orifice and can be moved to another pile position for hole forming construction;
s4: and (3) detection: detecting the hole depth and the hole diameter of the pile hole, and the depth and the diameter of the rotary expansion disc;
s5: and (4) placing a reinforcement cage: putting a reinforcement cage into the pile hole;
s6: placing a guide pipe: putting a perfusion catheter down into the pile hole;
s7: hole cleaning construction: after the concrete tank truck arrives at a construction site, only one-time hole cleaning construction of the sediment at the bottom of the pile hole is carried out by adopting a mud pump suction reverse circulation process, and the concrete operation is as follows: the water inlet end of a slurry inlet pipe of the mobile pump device is butted with the upper port of a perfusion guide pipe, and the water outlet end of a slurry outlet pipe is placed into a slurry pool; the movable mechanical pump device mainly comprises a diesel engine or electric power, a sand pump, a slurry inlet pipe, a slurry outlet pipe, a support frame and wheels;
starting the movable mechanical pump device, discharging the slurry and sediments at the bottom of the hole to a slurry tank through a filling guide pipe and a slurry inlet pipe, a sand pump and a slurry outlet pipe of the movable mechanical pump device for sedimentation, returning the slurry at the upper part of the slurry tank into the drill hole through a slurry ditch, and circularly reciprocating the slurry in such a way, so that the sediments at the bottom of the hole can be completely and thoroughly replaced; in the process, the flow direction of the slurry in the pile hole is from top to bottom, namely, the slurry and the fine-crushed sediment on the periphery of the filling pipe flow downwards under the action of gravity, and finally the sediment flows downwards to a suction port of the filling pipe; under the strong adsorption action of a sand pump in the filling conduit, the sediments at the bottom of the hole can be sucked into the filling conduit, the sediments supported by the slurry flow upwards in the filling conduit rapidly, and are discharged to a slurry tank for sedimentation through a slurry inlet pipe and a slurry outlet pipe of the mobile mechanical pump device, and the sediments are replaced by the slurry in the process;
s8: underwater concrete pouring: after the hole cleaning construction quality meets the requirements of industrial regulations, the hole is formed without long-time hole airing, collapse is strictly prevented, the concrete pouring work procedure construction is required to be continuously carried out until the pile is formed by pouring, the middle part of the pile is not stopped, and the pile forming construction quality is ensured, and the concrete operation is as follows: when the concrete tank truck enters a construction site, the used pouring guide pipe for cleaning the hole is used for pouring concrete into the hole, so that seamless connection between the hole cleaning procedure and the concrete pouring procedure is really realized, the construction time from hole forming to pile forming is effectively shortened, and the method is very important for maintaining the stability of the hole wall, reducing the risk of hole collapse and ensuring the quality of concrete pouring pile forming.
In the step S1, when the slurry making of the natural stratum can not meet the requirement, the slurry making materials such as clay, bentonite, caustic soda and high molecular polymer chemical slurry can be supplemented into the slurry tank, the process of preparing the high-quality wall protection slurry is accelerated by virtue of the scouring action of the pumping positive circulation slurry, and the urgent requirement of the initial stage drilling on the high-quality wall protection slurry is met
In S1, the drilling speed of the drilling attachment section is preferably half of the drilling speed in the subsequent step.
In the drilling stage, a positive circulation construction process is adopted, and a drilling construction machine is mainly formed by combining a drilling and expanding disk drilling machine and a movable pump device; the movable mechanical pump device mainly comprises a diesel engine or electric power, a sand pump, a slurry inlet pipe, a slurry outlet pipe, a support frame and wheels; the device has the remarkable characteristics of small volume, large flow, flexible movement, convenient use and simple operation;
the specific operation is as follows: putting the water absorption port end of a slurry inlet pipe of the movable pump device into a slurry pool, and butting the water outlet end of a slurry outlet pipe with a slurry conveying pipe of a drilling machine; starting the movable mechanical pump device, and injecting water or slurry in the slurry pool to the bottom of the pile hole through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the movable mechanical pump device, a slurry conveying pipe, a sand pump and a drill rod of the drilling machine; the stratum soil cut by the rotation of the drill bit is supported and floated to the opening of the pile hole by the mud which flows in the hole in a positive circulation mode between the drill rod and the inner wall of the pile hole and flows into the mud tank along the mud ditch to be precipitated, the mud on the upper portion of the mud tank is sucked by the movable mechanical pump device and is injected into the bottom of the pile hole according to the channel, the mud is circulated and reciprocated in such a way, the stratum soil cut by the drill bit is replaced from the bottom of the pile hole, the drilling construction footage is continued in such a way, and the method is also called as a mud pump positive circulation drilling construction process.
The drilling and expanding disk drilling machine has the functions of crawler walking and hydraulic control of the vertical frame, so that a vertical hole or an inclined hole pointing to the center of the earth is formed through construction; a scale and a pointer assembly are arranged on the drilling machine to form a device with the functions of indicating the depth of a pile hole, the depth of a disc expanding and the diameter of the disc expanding; the drilling machine is also provided with laser ranging, liquid crystal display and electronic control to form a device with functions of electronically displaying pile hole depth, diameter, expanded disk depth and diameter, and related original construction data can be stored by a USB flash disk, so that the device is convenient for internal printing and retention; according to the operation procedure of rig pore-forming construction operation characteristics establishment, can establish operating personnel and rig interactive dialogue system to a certain extent, make the rig operation more accurate, pore-forming construction quality is known more, controllable, increases and expands the visual technical content of a set cavity shaping construction, effectively promotes pore-forming efficiency of construction and pore-forming construction quality.
The invention has the positive effects that:
firstly, a slurry pump positive circulation process is adopted in the drilling operation of the hole opening section with one baffle, the wall protection slurry can be manufactured by utilizing the natural stratum soil body on the upper part of the drilled hole to the maximum extent, and in combination with the operation of low footage, the stratum soil body can be cut into more finely-divided sediments, more slurry can be manufactured more efficiently, the slurry quality can be improved, the wall protection effect of the slurry is enhanced, and the method is in accordance with the urgent need of the drilling in the initial stage for the high-quality wall protection slurry. In addition, the drilling operation of the hole opening section and the hole blocking section is slowly advanced by adopting a slurry pump positive circulation process, so that the drilling forming is more vertical, regular and smooth, a good basic condition is laid for the subsequent hole forming construction, the perpendicularity of the pile hole formed by the subsequent construction is easier to control, and the risk of hole wall collapse is greatly reduced. The hole depth of the hole-forming section is usually five times to eight times of the hole diameter, the hole depth is switched to a slurry pump suction reverse circulation process after the depth is reached, the slurry pump suction reverse circulation process is adopted for the first-gear drilling operation and the second-gear rotary expansion disc operation until the hole-forming construction of the designed hole bottom depth is completed, the slurry reverse circulation can fully play the role on the premise that slurry is efficiently made in the positive circulation of the slurry and a good wall protection effect is realized in the hole-forming stage, the hole-forming construction efficiency is high, slag removal is rapid and thorough, the waste slurry is less in discharge, the friction resistance of the hole wall after pile forming is large, and the advantages of improving the bearing capacity of a single pile and the like are facilitated. Therefore, the combination of the two processes of positive circulation pumping and reverse circulation pumping of the slurry pump can improve the advantages and avoid the disadvantages in the hole forming construction of the drilling and expanding disc pile, exert the optimal efficiency and be beneficial to improving the hole forming construction quality and efficiency.
The drilling and expanding disc device is of a mechanical structure, and the diameter size of the rotary expanding disc corresponds to the stroke size of the rotary expanding disc, so that the working state of the drilling and expanding disc device in a drill hole can be accurately judged only by the rotation direction and the movement amount of the drill rod visible on the rack, and the quality of the drilling and the rotary expanding disc is controlled by an operator. The rotation speed and the rotation angle of the drill rod can be visually observed by an operator, and the up-and-down movement amount of the drill rod can be read from the scale pointed by the pointer. In short, the operating state of the drill rod, together with the associated display data and the like, becomes a reliable basis for the operator of the drilling machine to control the drilling machine.
Secondly, as the hole forming construction mainly adopts a slurry pump suction reverse circulation process, compared with the slurry forward circulation, the pile hole internal circulation slurry has smaller specific gravity, lower viscosity, smaller sand content and less sediment at the hole bottom, so that the hole cleaning operation can be saved after the hole forming. So as to provide good conditions for the slurry to better exert the wall protection effect, and therefore, the time limit for maintaining the stability of the hole wall can be prolonged, and the risk of the hole wall collapse is greatly reduced. The method adopts a high-footage hole forming operation mode under a slurry pump suction reverse circulation process, so that the granularity of sediments cut by a rotary expansion arm is obviously increased, large-particle sediments are not easy to dissolve in slurry in a short time, the sediments are quickly discharged into a slurry tank along with the slurry and are precipitated, the wall protection mud skin drilled with holes is not too thick, the friction resistance of the hole wall is favorably improved, the effect of slurry wall protection is maintained, the steel reinforcement cage is ensured to be placed down, a pouring guide pipe is placed down, and the good pile hole environment of pouring concrete is ensured.
Drawings
FIG. 1 is a flow chart of the construction method for hole forming of the positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile;
FIG. 2 is a schematic flow diagram of a mud positive circulation system according to the present invention;
FIG. 3 is a schematic flow diagram of a mud recirculation system according to the present invention;
FIG. 4 is a schematic structural diagram of a pile hole, wherein the pile hole 3 is composed of a hole wall 1 with the same diameter and a plurality of rotary expansion disc cavities 2;
fig. 5 is a structural schematic diagram of the drilling and expanding disc pile.
Reference numerals: 1 equal-diameter hole wall 2 rotary expansion disc cavity 3 pile hole 4 concrete 5 rotary expansion disc 6 steel reinforcement cage
Detailed Description
The invention relates to a hole forming construction method for a positive and negative bidirectional circulation once hole cleaning, drilling and expanding disc pile, which comprises the following steps in sequence as shown in figure 1: the construction site tee bend is one level, measures the pile hole position laying-out, buries underground and protects a section of thick bamboo, sets up mud ditch and mud pit, to protecting a section of thick bamboo, water injection in mud ditch and the mud pit, the rig takes one's place, centering, flattening, should protect a section of thick bamboo water injection in to before opening the brill, follow-up in proper order according to the following step operation:
s1: opening a hole: enabling the drill bit tip of a drilling and expanding disc device of the drilling machine to vertically point to the center of a drilling hole in the protective cylinder, operating the drilling machine to start a slurry pump positive circulation system, and enabling the drill bit to rotate to cut sediment generated by stratum soil bodies to be further fused with water or slurry to form wall protection slurry in a first gear state; the drilling operation of the hole opening section and the hole blocking section adopts a slurry pump positive circulation process to carry out slow footage, so that the drilling forming is more vertical, and the slurry can protect the hole wall more easily; on the other hand, more retaining wall slurry can be produced by utilizing the natural stratum soil mass on the upper part of the drilled hole to the maximum extent. The positive circulation means that the movable pump device is started, so that water or slurry on the upper part of the slurry pool is injected into the bottom of a pile hole through a slurry inlet pipe, a sand pump, a slurry outlet pipe, a slurry conveying pipe of a drilling machine, a sand pump and a drill rod in sequence; the mud at the bottom of the hole supports the floating sediment, upwards flows to the hole opening of the pile hole in an annular cavity between the drill rod and the wall of the pile hole, and then flows into a mud tank through a mud ditch to be precipitated; the mud on the upper part of the mud pool is sucked by the sand pump through the mud inlet pipe and is re-injected to the bottom of the drilled hole according to the path, and the mud is circularly reciprocated in such a way to continuously replace sediment from the bottom of the hole to the mud pool for sedimentation, so that the method is also called as a positive circulation hole forming construction process of the mud pump. In the whole circulation process, the slurry is injected from the bottom of the pile hole, flows upwards along the inside of the pile hole to the orifice and overflows outwards.
The drilling construction in the hole opening stage is preferably carried out by adopting a slow-advancing operation method and matching with slurry positive circulation, so that the stratum soil body can be cut into more finely-divided sediments, sufficient slurry for the retaining wall can be manufactured more efficiently, meanwhile, the hole wall is favorably reinforced, the formed drilling hole is more vertical, regular and smooth, and certain convenient conditions are provided for subsequently lifting out the drilling and expanding disc device, the lower reinforcing cage and the filling pipe: more demanding high quality wall protection mud is produced using the limited time and limited formation conditions of the open hole section. The drilling section is preferably operated by slowing down the drilling head, and the fine-crushed sediment generated by cutting the soil body on the wall of the hole by the drilling head is fully mixed with the mud in the hole to form high-quality wall protection mud to participate in circulation. In terms of slurry production capacity, the slurry pumping forward circulation process is generally significantly better than the slurry pumping reverse circulation process, especially at a certain time and within a certain depth of the hole at the beginning of the opening.
As is known, the quality of the slurry retaining wall in the hole forming stage is crucial to the stability of the hole wall in the subsequent hole forming stage, the positive circulation process of the slurry pump is adopted in the hole forming stage, favorable conditions can be provided for hole forming construction by the subsequent reverse circulation process of the slurry pump, the stability of the hole wall is effectively improved, and the hole collapse risk is greatly reduced. The subsequent hole forming construction adopts a slurry pump suction reverse circulation process, and has the advantages of high hole forming construction efficiency, rapid and thorough slag removal, less waste slurry discharge, large frictional resistance due to thin mud on the wall of a hole after pile forming, contribution to improving the bearing capacity of a single pile and the like which are difficult to achieve by a slurry forward circulation process. In addition, the drilling construction of trompil stage adopts the operation of advancing the chi slowly, can be favorable to letting the drilling rod of rig just keep a perpendicular, stable pore-forming construction state at the beginning of trompil, and the straightness that hangs down that ensures the pore-forming that drills satisfies the trade specification requirement, and certain length of drilling pore-forming upper portion has higher straightness that hangs down and regular slick and sly pore wall, and it has extremely critical influence to the straightness that hangs down and the pore wall stability of follow-up pore-forming construction. In other words, ensuring that the drilling section is vertical will lay a good foundation for subsequent drilling hole perpendicularity and construction quality thereof, and sufficient attention should be paid. The operation method of slow footage is adopted in the hole opening construction, and the method is a general technique for producing high-quality slurry with high efficiency. The combined use effect of the two processes of the positive circulation of the slurry pump and the reverse circulation of the slurry pump in the hole forming construction of the drilling and expanding disc pile is better.
S2: and (3) pore-forming construction: when the drilling depth reaches five to eight times of the aperture of the pile hole, changing the mud positive circulation mode into the mud reverse circulation mode, and continuously drilling and expanding the disc by the drilling machine; the reverse circulation refers to that: starting a sand pump on a drilling machine, discharging the mud and sediments at the bottom of a pile hole to a mud pool through a drill rod suction port positioned in the center of the bottom of the pile hole, and precipitating the mud and sediments, wherein the mud at the upper part of the mud pool flows back into the drilling hole through a mud ditch, and the mud circularly reciprocates in such a way to continuously replace the sediments from the bottom of the hole to the mud pool for precipitating, so that the method is called a mud pump suction reverse circulation pore-forming construction process;
when the drilling and expanding disc device drills to the set depth of the first expanding disc, the drilling and expanding disc device is switched to the expanding disc gear position, namely, the two gear positions are achieved, at the moment, a drill bit of the drilling and expanding disc device does not rotate, the rotary expanding arm gradually expands and rotates along with the outer tube of the drilling and expanding disc device, and at the moment, the drill bit plays a supporting role in rotatably cutting the hole wall for the rotary expanding arm. In the rotation process, the rotary expansion arm cuts the hole wall, the hole diameter is gradually expanded until the drilling and expanding disk device is expanded to the maximum extent, and one-time disk expanding operation is completed to form a rotary expansion disk; and then, the rotary expansion arm is retracted and reset, the drilling and expanding disc device is switched to a drilling gear again, at the moment, the drilling and expanding disc device drives the drill bit to continue to rotate for drilling, and the depth of the pile hole is extended downwards.
When the pile hole reaches the set depth, the drilling and expanding disc device is switched to the disc expanding gear again to expand the pile hole, after the disc expanding operation is completed, the drilling and expanding disc device is switched to the drilling gear again to drill the pile hole, and the process is circulated until the pile hole reaches the set depth, namely the hole construction is finished; in this step, when all drilling and expand the dish operation, all adopt the mud pump to inhale reverse circulation technology, simultaneously, the drill bit drilling and the rotation direction that the arm expanded the dish soon keep unanimous, avoid the maloperation: because the drill rod joint is mostly in a threaded connection structure form, if the rotation directions of drilling and expanding are inconsistent, huge rotation torque is easy to fall off at the joint connection part of the drill rod, and the drilling and expanding disc device is retained in a pile hole, and is difficult to take out at the moment, so that the drilling and expanding disc device is only required to be buried in place and is additionally selected for hole forming, thereby greatly increasing the construction cost and causing the delay of the construction period;
when special requirements are met on the size of the expansion disc, the drilling gear and the expansion disc gear are frequently and alternately operated, the height of the expansion disc and the thickness of the edge of the disc can be gradually increased to meet design requirements, and the shearing strength and the bearing capacity of the concrete expansion disc are improved. However, in order to make the edge of the expanded disk cavity formed by construction regular and smooth, the expanded disk height and the thickness of the disk edge which are increased by each alternate operation of the gears are controlled not to exceed the thickness of the rotary expanded arm, and a slurry pump reverse circulation system normally operates during the process. In general, in order to maximize the bearing potential of the stratum, for the stratum with higher foundation bearing capacity, the rotary expansion disc arranged at the position needs to bear larger load, so that the height of the rotary expansion disc and the thickness of the edge of the disc are not two choices.
S3: the drilling machine moves away from the pile hole: after the hole forming construction of the drilling machine is finished, hole cleaning construction is not required, but the drilling machine and the disc expanding device are directly lifted out of an orifice and can be moved to another pile position for hole forming construction;
s4: and (3) detection: detecting the hole depth and the hole diameter of the pile hole, the depth of the expanded disc and the diameter of the cavity;
s5: and (4) placing a reinforcement cage: putting a reinforcement cage into the pile hole;
s6: and (3) lowering the perfusion catheter: putting a perfusion catheter down into the pile hole;
s7: hole cleaning construction: after the concrete tank truck arrives at a construction site, only one-time hole cleaning construction of the sediment at the bottom of the pile hole is carried out by adopting a mud pump suction reverse circulation process, and the concrete operation is as follows: the water inlet end of a slurry inlet pipe of the mobile pump device is butted with the upper port of a perfusion guide pipe, and the water outlet end of a slurry outlet pipe is placed into a slurry pool; the movable mechanical pump device mainly comprises a diesel engine or electric power, a sand pump, a slurry inlet pipe, a slurry outlet pipe, a support frame and wheels; the mobile mechanical pump device can be applied in various fields, and in terms of the technical scheme, the mobile mechanical pump device can be combined with a drilling and expanding disc drilling machine to form a slurry pump suction positive circulation system to perform equal-diameter drilling construction, and can also be matched with a perfusion conduit which is lowered into a drill hole to perform hole bottom sediment cleaning in a pump suction reverse circulation method. When the hole cleaning device is used for cleaning holes by a pump suction reverse circulation process, the inlet end of a slurry inlet pipe of the movable pump device can be in butt joint with the upper opening of a filling guide pipe, the outlet end of a slurry outlet pipe is placed into a slurry tank, and a sand pump of the pump device is started, so that sediment at the bottom of the hole can be quickly and thoroughly cleaned, the hole cleaning quality is good, and the hole cleaning effect is high. The reverse circulation hole cleaning process is as follows:
starting the mobile mechanical pump device, discharging the slurry and sediments at the bottom of the hole to a slurry tank through a filling guide pipe and a slurry inlet pipe, a sand pump and a slurry outlet pipe of the mobile mechanical pump device for sedimentation, returning the slurry at the upper part of the slurry tank into the drill hole through a slurry ditch, and completely and cleanly replacing the sediments at the bottom of the hole by the slurry in such a circulating and reciprocating way; in the process, the mud flow direction in the pile hole is from top to bottom, namely, the mud and the fine-crushed sediment on the periphery of the perfusion catheter flow downwards under the action of gravity, and finally the sediment flows downwards to a suction port of the perfusion catheter; the sediment at the bottom of the hole can be sucked into the perfusion conduit under the strong adsorption action of a sand pump in the perfusion conduit, the sediment supported by the slurry flows upwards in the perfusion conduit rapidly, and is discharged to a slurry tank for sedimentation through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the mobile mechanical pump device, and the sediment is replaced by the slurry in the process;
s8: underwater concrete pouring: after the hole cleaning construction quality meets the requirements of industrial regulations, the hole is formed without long-time hole airing, collapse is strictly prevented, the concrete pouring work procedure construction is required to be continuously carried out until the pile is formed by pouring, the middle part of the pile is not stopped, and the pile forming construction quality is ensured, and the concrete operation is as follows: when the concrete tank car enters a construction site, the used pouring guide pipe for hole cleaning is used for pouring concrete into the hole, so that seamless connection between the hole cleaning procedure and the concrete pouring procedure is really realized, the construction time from hole forming to pile forming is effectively shortened, and the method is very important for ensuring the quality of the concrete poured pile.
For geological conditions which are extremely special in soil layers and are not beneficial to slurry making, in S1, when slurry making of a natural stratum cannot meet requirements, slurry making materials such as clay, bentonite, caustic soda, high polymer chemical slurry and the like can be supplemented into a slurry tank, the process of preparing high-quality wall protection slurry is accelerated by virtue of the scouring action of pumping positive circulation slurry, and the urgent requirement of drilling in the initial stage on the high-quality wall protection slurry is met.
In S1, the drilling footage speed of the holing stage is half of the drilling footage speed in the subsequent steps, so that the vertical verticality of the drilling forming in the holing stage is ensured, and the requirements of high-efficiency and high-quality slurry making are met. The drilling and expanding disc drilling machine has the advantages that the drilling and expanding disc drilling machine has a good starting point of hole forming and wall protection in a slurry pump positive circulation mode in the hole forming stage, a slurry pump reverse circulation mode is adopted in the subsequent drilling and expanding disc hole forming construction process, the construction hole forming footage can be enlarged according to the performance and the stratum conditions of the drilling and expanding disc drilling machine, and the work efficiency is improved in an effort mode. The operation can not only produce a large amount of large-particle sediments, but also avoid producing excessive breast wall slurry, so that the discharge amount of the waste slurry is reduced, and the environment protection is facilitated.
In the drilling stage, a positive circulation construction process is adopted, and a drilling construction machine is mainly formed by combining a drilling and expanding disk drilling machine and a movable pump device; the movable mechanical pump device mainly comprises a diesel engine or electric power, a sand pump, a slurry inlet pipe, a slurry outlet pipe, a support frame and wheels; the device has the remarkable characteristics of small volume, large flow, flexible movement, convenient use and simple operation; the positive cycle construction specifically operates as follows: putting the water absorbing end of a slurry inlet pipe of the movable pump device into a slurry pool, and butting the water outlet end of a slurry outlet pipe with a slurry conveying pipe of a drilling machine; starting the movable mechanical pump device, and injecting water or slurry in the slurry pool to the bottom of the pile hole through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the movable mechanical pump device, a slurry conveying pipe, a sand pump and a drill rod of the drilling machine; the stratum soil cut by the rotation of the drill bit is supported and floated to the opening of the pile hole by the mud which flows in the hole in a positive circulation mode between the drill rod and the inner wall of the pile hole and flows into the mud tank along the mud ditch to be precipitated, the mud on the upper portion of the mud tank is sucked by the movable mechanical pump device and is injected into the bottom of the pile hole according to the channel, the mud is circulated and reciprocated in such a way, the stratum soil cut by the drill bit is replaced from the bottom of the pile hole, the drilling construction footage is continued in such a way, and the method is also called as a mud pump positive circulation drilling construction process.
The drilling and expanding disk drilling machine has the functions of crawler walking and hydraulic control of the vertical frame, so that a vertical hole or an oblique hole pointing to the center of the earth is constructed and formed; a scale and a pointer assembly are arranged on the drilling machine to form a device with the functions of indicating the depth of a pile hole, the depth of a disc expanding and the diameter of the disc expanding; the drilling machine is also provided with laser ranging, liquid crystal display and electronic control to form a device with functions of electronically displaying pile hole depth, diameter, expanded disk depth and diameter, and related original construction data can be stored by a USB flash disk, so that the device is convenient for internal printing and retention; according to the operation procedure of rig pore-forming construction operation characteristics establishment, can establish operating personnel and rig interactive dialogue system to a certain extent, make the rig operation more accurate, pore-forming construction quality is known more, controllable, increases and expands the visual technical content of a set cavity shaping construction, effectively promotes pore-forming efficiency of construction and pore-forming construction quality.
The drilling and rotary expansion disc dual-function pore-forming construction equipment comprises a drilling machine and a drilling expansion disc device, wherein the drilling machine can realize the slurry pump suction reverse circulation pore-forming construction of a cast-in-situ bored pile, and the drilling and expansion disc dual-function pore-forming construction can be implemented. The drilling and expanding disc device cannot be independently applied to engineering construction, and a drilling machine with a drilling function and a disc expanding function can be formed by combining the drilling and expanding disc device when the drilling and expanding disc device is grafted on an existing slurry pump suction reverse circulation drilling machine. And during grafting, the upper end of the outer pipe of the drilling and expanding disc device is butted with a drill rod of a drilling machine.
After the pore-forming construction is finished, the drilling and expanding device is lifted out of the hole opening, the drilling and expanding device can be moved to another pile position for pore-forming construction, and quality detection can be performed on a drilled hole, wherein the quality detection generally comprises detection of the diameter, the depth, the diameter and the depth position of an expanding disc, sediment thickness and the like. After the pore-forming construction quality detection meets the design requirement, the working procedures of placing a reinforcement cage in the drill hole and placing a perfusion conduit can be carried out continuously. When the concrete tank truck arrives at a construction site, a movable mechanical pump device is used for cleaning sediment at the bottom of a hole by a slurry pump suction reverse circulation process, and underwater concrete pouring working procedure construction is immediately carried out after the hole cleaning quality meets relevant requirements. The construction method of slurry pump suction reverse circulation matched with high footage is mainly used for pore-forming construction, and its technological process is characterized by that the stratum soil cut by drill bit or expanding disk wall is sucked by drill bit and discharged into the slurry pool on the ground, and in the course of pore-forming construction the bottom of hole is hardly retained by sediment. If the hole cleaning inevitably causes the wall protection performance of the slurry to be greatly reduced, the stability of the drilling wall is directly influenced, the collapse risk is increased, and therefore the hole cleaning is not suitable to be continuously carried out after the hole is formed. Therefore, after the hole is formed under the steel reinforcement cage and the pouring guide pipe in a mode that the fast-advancing ruler is used for forming the hole and is matched with a slurry pump to pump the reverse circulation, the bottom sediment of the hole is cleaned by adopting a slurry pump to pump the reverse circulation process to be the best time only when the concrete tank car enters a construction site, and the bottom sediment is cleaned, which is the only one-time hole cleaning in the hole forming construction process of the drilling and expanding disc pile. After hole cleaning is finished, concrete can be poured into the holes through the used pouring guide pipes for hole cleaning, seamless connection between hole cleaning and concrete pouring is really achieved, the whole pile foundation construction process is very compact, the construction period is short, and the method is vital to guarantee the quality of concrete pouring piles.
The technical solution of the present invention is not limited to the scope of the embodiments of the present invention. The technical contents not described in detail in the present invention are all known techniques.
Claims (6)
1. The construction method for forming the hole of the pile with the hole cleaning, drilling and expanding disc in one step by positive and negative bidirectional circulation sequentially comprises the following steps of: the construction site tee bend is one level, and pile hole position lofting buries underground and protects a section of thick bamboo, sets up mud ditch and mud pit, fills water or mud in to protecting a section of thick bamboo, mud ditch and mud pit to let mud pit, mud ditch and protect water or mud UNICOM in the section of thick bamboo, the rig is taken one's place, centering, flattening, its characterized in that, follow-up in proper order according to the following step operation:
s1: and (3) opening holes: the method comprises the steps of drilling equal-diameter holes, enabling the drill bit tip of a drilling and expanding disc device of a drilling machine to vertically point to the center of a drilling hole in a casing, operating the drilling machine to start a slurry pump positive circulation system, enabling the drill bit to rotate to cut the stratum soil body to form a pile hole, simultaneously injecting water in a slurry tank into the pile hole, fusing the water and sediments generated by the rotation of the drill bit to cut the stratum soil body to form slurry of a retaining wall, and enabling the water or the slurry to perform positive circulation; in the process, the drilling and expanding disc device is in a drilling state, namely a first-gear state;
the positive circulation means that the movable mechanical pump device is started, and water or slurry on the upper part of the slurry pool is injected into the bottom of a pile hole through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the movable mechanical pump device, a slurry conveying pipe of a drilling machine, a sand pump and a drill rod in sequence; the mud at the bottom of the hole supports the floating sediment, flows upwards to the hole opening of the pile hole in an annular cavity between the drill rod and the wall of the pile hole, and then flows into a mud tank through a mud ditch; after sediment is precipitated in the mud pit, mud on the upper part of the mud pit is sucked by the sand pump through the mud inlet pipe and is injected into the bottom of the drilled hole again according to the path, the mud is circularly reciprocated in such a way to continuously replace the sediment from the bottom of the hole to the mud pit for precipitation, the method is also called as a mud pump positive circulation hole forming construction process, and in the construction process of the drilled hole, the mud is injected from the center of the bottom of the pile hole and flows upwards along the inside of the pile hole until the hole opening overflows outwards; in the drilling stage, a slow footage operation method is adopted; the movable mechanical pump device mainly comprises the existing diesel engine or motor, a sand pump, a slurry inlet pipe, a slurry outlet pipe, a support frame and wheels;
s2: and (3) hole forming construction: the step comprises drilling and expanding, when the drilling depth reaches five to eight times of the aperture of the pile hole, the positive circulation mode is changed into the reverse circulation mode, and the drilling machine continues to drill; the reverse circulation refers to that: starting a sand pump on a drilling machine, discharging the slurry and sediments at the bottom of a pile hole to a slurry pool through a drill rod suction port positioned in the center of the bottom of the pile hole, and precipitating the slurry and sediments, wherein the slurry at the upper part of the slurry pool flows back into the drilling hole through a slurry ditch under the action of gravity, and the slurry is circularly reciprocated in such a way that the sediments are continuously replaced from the bottom of the hole to the slurry pool to precipitate, so that the method is called a slurry pump suction reverse circulation pore-forming construction process;
when the drilling and expanding disc device drills to the set depth of the first expanding disc, the drilling and expanding disc device is switched to an expanding disc gear, at the moment, a drill bit of the drilling and expanding disc device does not rotate, the rotary expanding arm gradually expands and rotates along with the outer tube of the drilling and expanding disc device, and at the moment, the drill bit plays a role in stably supporting the rotary expanding arm; under the drive of the rotation of the drill rod, the rotary expansion arm cuts the hole wall to expand the hole diameter until the drilling and expanding disc device is expanded to the maximum extent, and one disc expanding operation is completed to form a rotary expansion disc; then, the rotary expansion arm is retracted and reset, the drilling and expanding disc device is switched to a drilling gear again, and at the moment, the drilling and expanding disc device drives the drill bit to continue rotating to extend the depth of the pile hole downwards;
when the drilling is carried out to the set depth of the second expansion disc, the drilling and expansion disc device is switched to the expansion disc gear again to expand the discs, after the disc expansion operation is completed, the drilling and expansion disc device is switched to the drilling gear again to drill holes, the operation is circulated in such a way, and when the pile holes reach the set depth, hole construction is finished; in the step, when all drilling and disc expanding operations are carried out, a slurry pump suction reverse circulation process is adopted, and meanwhile, the rotating directions of drilling of a drill bit and disc expanding of a rotary expanding arm are kept consistent;
s3: the drilling machine moves away from the pile hole: after the hole forming construction of the drilling machine is finished, the hole cleaning construction is not carried out, but the drilling machine and the drilling and expanding disc device are directly lifted out of the hole opening;
s4: and (3) detection: detecting the hole depth and the hole diameter of the pile hole, and the depth and the cavity diameter of the rotary expansion disc;
s5: and (4) placing a reinforcement cage: putting a reinforcement cage into the pile hole;
s6: placing a guide pipe: putting a perfusion catheter down into the pile hole;
s7: hole cleaning construction: after the concrete tank truck arrives at a construction site, only one-time hole cleaning construction of the sediment at the bottom of the pile hole is carried out by adopting a mud pump suction reverse circulation process, and the concrete operation is as follows: the water absorption end of a slurry inlet pipe of the movable pump device is butted with the upper end opening of a perfusion guide pipe, and the water outlet end of a slurry outlet pipe is placed into a slurry pool;
starting the mobile mechanical pump device, discharging the slurry and sediments at the bottom of the hole to a slurry tank through a filling guide pipe and a slurry inlet pipe, a sand pump and a slurry outlet pipe of the mobile mechanical pump device for sedimentation, returning the slurry at the upper part of the slurry tank into the drill hole through a slurry ditch, and completely and cleanly replacing the sediments at the bottom of the hole by the slurry in such a circulating and reciprocating way; in the process, the mud in the pile hole flows from top to bottom, namely, the mud and the sediments at the periphery of the perfusion catheter flow downwards under the action of gravity, and finally the sediments flow downwards to a suction port of the perfusion catheter; under the strong adsorption action of a sand pump in the filling conduit, the sediment at the bottom of the hole can be sucked into the filling conduit, the sediment supported by the slurry flows upwards in the filling conduit rapidly, and is discharged to a slurry tank for precipitation through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the mobile mechanical pump device, and the sediment is replaced by the slurry in the process;
s8: underwater concrete pouring: the method comprises the following steps of cleaning sediments at the bottom of a hole according to the requirements of industrial regulations, then airing the hole for a long time, strictly preventing collapse, continuously carrying out concrete pouring construction until a pile is poured, stopping the middle of the pile, and ensuring the pile-forming construction quality.
2. The positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method according to claim 1, characterized in that: in the step S1, when the natural formation slurry making can not meet the requirements, the slurry making material is supplemented into the slurry pool, the process of preparing the high-quality wall protection slurry is accelerated by virtue of the scouring action of the pumping positive circulation slurry, and the urgent requirement of the initial stage pore-forming drilling on the high-quality wall protection slurry is met; the slurry making material is clay, bentonite, caustic soda or high molecular polymer chemical slurry;
3. the positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method according to claim 1, characterized in that: in S1, the drilling speed in the drilling stage is half of the drilling speed in the subsequent steps.
4. The positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method according to claim 1, characterized in that: the hole forming construction machine is mainly formed by combining a drilling machine and a movable pump device;
the specific operation is as follows: putting the water absorbing end of a slurry inlet pipe of the movable pump device into a slurry pool, and butting the water outlet end of a slurry outlet pipe with a slurry conveying pipe of a drilling machine; starting the movable mechanical pump device, and injecting water or slurry in the slurry pool to the bottom of the pile hole through a slurry inlet pipe, a sand pump and a slurry outlet pipe of the movable mechanical pump device, a slurry conveying pipe, a sand pump and a drill rod of the drilling machine; the stratum soil body cut by the rotation of the drill bit is supported and floated to the hole opening of the pile hole by the mud which flows in the positive circulation mode in the hole along the space between the drill rod and the inner wall of the pile hole and flows into the mud tank along the mud ditch to be precipitated, the mud on the upper part of the mud tank is sucked by the movable mechanical pump device and is injected to the bottom of the pile hole according to the path, the mud circularly reciprocates in such a way to replace the stratum soil body cut by the drill bit from the bottom of the pile hole, and the drilling construction footage is continuous in such a way, and the method is also called as a mud pump suction positive circulation drilling construction process.
5. The positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method according to claim 1, characterized in that: the drilling machine has the functions of crawler walking and hydraulic control of the vertical frame, so that a vertical hole or an oblique hole pointing to the center of the earth is constructed and formed; a scale and a pointer assembly are arranged on the drilling machine to form a device with the functions of indicating the depth of a pile hole, the depth of a rotary expansion disc and the diameter of the rotary expansion disc; the drilling machine is also provided with laser ranging, liquid crystal display and electronic control to form a device with functions of electronically displaying pile hole depth, rotary expansion disc depth and diameter, and related original construction data can be stored by a U disc, so that the device is convenient for internal printing and retention; according to the operation procedure of rig pore-forming construction operation characteristics establishment, can establish operating personnel and rig interactive dialogue system to a certain extent, make the rig operation more accurate, pore-forming construction quality is known more, controllable, increases the visual technical content of the rotatory expansion disc cavity shaping construction, effectively promotes pore-forming efficiency of construction and pore-forming construction quality.
6. The positive and negative bidirectional circulation one-time hole cleaning, drilling and expanding disc pile hole forming construction method according to claim 1, characterized in that: in the expanding operation of S2, in order to gradually increase the height of the rotary expanding disc and the thickness of the edge of the disc so as to improve the shear strength and the bearing capacity of the concrete expanding disc, a method of frequent alternate operation of the first gear and the second gear is adopted, wherein the operation method is that the drilling and expanding disc is made to drill and expand to the maximum designed disc diameter in the first gear state and the second gear state each time without exceeding the thickness of the drilling and expanding arm; so keep off and keep off two and change several times repeatedly, at every turn expand the dish height and the dish edge thickness all with the same size increase to reach the required design requirement that expands the dish height and dish edge thickness soon, and can ensure the fashioned spiral of construction and expand the dish cavity standard, slick and sly.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115369864A (en) * | 2022-09-01 | 2022-11-22 | 中建七局国际工程建设有限公司 | Construction method of low-carbon high-strength overload prepressing pre-settling diagenetic composite pile |
| CN115879201A (en) * | 2022-12-20 | 2023-03-31 | 同济大学 | Permanent pile casing and analysis method for bearing capacity of sediment solidification hoisting cast-in-place pile |
| CN116537721A (en) * | 2023-06-27 | 2023-08-04 | 陕西路桥集团有限公司 | Slurry circulation construction process in underground directional drilling and laying construction |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115369864A (en) * | 2022-09-01 | 2022-11-22 | 中建七局国际工程建设有限公司 | Construction method of low-carbon high-strength overload prepressing pre-settling diagenetic composite pile |
| CN115879201A (en) * | 2022-12-20 | 2023-03-31 | 同济大学 | Permanent pile casing and analysis method for bearing capacity of sediment solidification hoisting cast-in-place pile |
| CN115879201B (en) * | 2022-12-20 | 2023-09-05 | 同济大学 | Analysis method for permanent pile casing and sediment solidification and lifting cast-in-place pile bearing capacity |
| CN116537721A (en) * | 2023-06-27 | 2023-08-04 | 陕西路桥集团有限公司 | Slurry circulation construction process in underground directional drilling and laying construction |
| CN116537721B (en) * | 2023-06-27 | 2023-09-26 | 陕西路桥集团有限公司 | Slurry circulation construction process in underground directional drilling and laying construction |
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