CN112610186A - Method for cleaning hole wall of section for resisting pile pulling in rock - Google Patents
Method for cleaning hole wall of section for resisting pile pulling in rock Download PDFInfo
- Publication number
- CN112610186A CN112610186A CN202011396126.7A CN202011396126A CN112610186A CN 112610186 A CN112610186 A CN 112610186A CN 202011396126 A CN202011396126 A CN 202011396126A CN 112610186 A CN112610186 A CN 112610186A
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- hole
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- brushing
- drill bit
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- 239000011435 rock Substances 0.000 title claims abstract description 69
- 238000004140 cleaning Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000001680 brushing effect Effects 0.000 claims abstract description 84
- 238000005553 drilling Methods 0.000 claims abstract description 59
- 239000002893 slag Substances 0.000 claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000005520 cutting process Methods 0.000 claims description 20
- 210000004209 hair Anatomy 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 230000008602 contraction Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
Images
Classifications
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- 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
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of drilling and pore-forming construction of uplift piles, and discloses a method for cleaning the pore wall of an uplift pile rock section, which comprises the following steps: s10, drilling a hole to a designed pile bottom elevation by using a rotary drilling rig in a rotary drilling manner, and removing slag at the bottom of the hole by using a slag removing drilling bucket; s30, lowering a wall brushing drill bit to the bottom of the hole, wherein the bottom of the wall brushing drill bit is provided with a wall brushing device, the wall brushing device is provided with a plurality of brush holders which expand through forward rotation and contract through reverse rotation, and the ends of the brush holders are provided with bristles; s40, rotating in the positive direction to open the brush holders; s50, rotating the wall brushing drill bit in the positive direction again, and brushing mud on the hole wall of the rock stratum section until the mud is brushed to the elevation position of the rock stratum section; and S60, rotating in the opposite direction to shrink the brush holders and taking out the brush wall drill bits. The method for cleaning the hole wall of the section for resisting the pile pulling in the rock provided by the technical scheme of the invention has better wall cleaning effect on the rock section.
Description
Technical Field
The invention relates to the technical field of drilling and pore-forming construction of uplift piles, in particular to a method for cleaning the pore wall of an uplift pile rock section.
Background
When the buoyancy of underground water cannot be balanced by the load of the upper structure of the building, the whole or part of the structure can be acted by upward floating force, such as a basement structure of the building, an underground large-scale water tank, an underground biochemical tank of a sewage treatment plant and the like, and anti-pulling piles are required to be arranged for ensuring the use safety of the building (structure). The uplift pile resists vertical uplift force by means of friction force between a pile body and a soil layer or a rock stratum, and when the pile end is embedded into the rock stratum, the friction force is mainly provided by a rock stratum section.
At present, a rotary drilling rig is generally adopted for forming holes in a cast-in-place pile, and a slurry wall protection is adopted in the drilling process, so that the specific gravity of slurry is maintained to be about 1.10-1.20 in order to ensure the stability of a hole wall. The mud for protecting wall is prepared by bentonite, soda ash, water and additive according to a certain proportion, usually, the mud can form a mud skin with a certain thickness on the hole wall, the mud skin can be adsorbed on the hole wall to improve the stability of the hole wall, but for the uplift pile, the existence of the mud skin is equivalent to adding a layer of lubricant between the pile body and the hole wall, and the bearing capacity of the uplift pile is reduced to a certain extent.
In order to improve the adhesion influence of the mud skin on the hole wall of the rock interval, steel brushes are arranged on the rotary drilling bit barrel body for some projects, and wall brushing operation is carried out on the hole wall; however, because the steel brush is fixedly installed, in the process that the steel brush penetrates into the bottom of the hole from the hole opening, wall brushing operation of different degrees can be carried out on the full-length hole wall, and more sludge can be generated in the wall brushing operation of the upper rock interval and fall and accumulate at the bottom of the hole, so that the wall brushing effect on the lower rock interval is influenced; meanwhile, due to the high influence of the installation position, the wall brushing effect on part of rock stratums of the hole bottom section cannot be realized effectively.
Disclosure of Invention
The invention aims to provide a method for cleaning a hole wall of a section of a resisting pile pulling-out rock, and aims to solve the problem that a fixed steel brush structure in the prior art is poor in wall cleaning effect on a rock layer section.
The invention is realized in such a way that a method for cleaning the hole wall of the section for resisting the pile pulling-out into the rock comprises the following steps:
s10, drilling a hole to a designed pile bottom elevation by using a rotary drilling rig in a rotary drilling manner, and removing slag at the bottom of the hole by using a slag removing drilling bucket;
s30, lowering a wall brushing drill bit to the bottom of the hole, wherein the bottom of the wall brushing drill bit is provided with a wall brushing device, the wall brushing device is provided with a plurality of brush holders which expand through forward rotation and contract through reverse rotation, and the ends of the brush holders are provided with bristles;
s40, rotating in the positive direction to open the brush holders;
s50, rotating the wall brushing drill bit in the positive direction again, and brushing mud on the hole wall of the rock stratum section until the mud is brushed to the elevation position of the rock stratum section;
and S60, rotating in the opposite direction to shrink the brush holders and taking out the brush wall drill bits.
Optionally, the wall-brushing drill bit includes a barrel body and the wall-brushing device, the wall-brushing device includes a bottom plate, a plurality of brush holders and a plurality of baffles, the bottom plate is connected to the bottom of the barrel body, the bottom plate has a lower surface facing away from the barrel body, the brush holders are rotatably disposed on the lower surface of the bottom plate, the baffles are fixed on the lower surface of the bottom plate, and the plurality of brush holders and the plurality of baffles are sequentially staggered around the bottom plate; when the brush holder rotates to the baffle on one side of the butt joint, the brush holder is in an open shape, and when the brush holder rotates to the baffle on the other side of the butt joint, the brush holder is in a contracted shape.
Optionally, a pressure relief hole is formed in the middle of the bottom plate, a hollow-out cavity is formed in the barrel body, and the pressure relief hole is communicated with the hollow-out cavity.
Optionally, before S30:
s21, cutting the bottom of the drill bit to form a smooth cutting surface at the bottom and form the cylinder body;
s22, prefabricating the bottom plate and the baffle plate by using a steel plate material, and welding and installing;
s23, welding the bottom plate and the bottom of the cylinder body in a full-welding mode;
s24, manufacturing the brush holders, mounting a plurality of brush holders on the base plate, inserting the bristles into the brush holders, and dispersing the bristles in a divergent manner.
Optionally, S10 includes:
s11, lofting the pile hole on the spot by using a total station, and positioning and marking;
s12, after the rotary drilling rig is installed and centered, connecting and starting a slurry circulating system to start drilling;
s13, drilling the soil layer section by adopting a rotary drilling bucket;
s14, replacing a cutting pick barrel drill for drilling in the rock stratum section, cutting and breaking rock by a cutting pick of the cutting pick barrel drill, replacing the slag removing drill bucket for removing slag, and repeatedly performing circulating operation until a drilled hole reaches the designed pile bottom elevation;
and S15, carrying out slag salvaging operation by using the slag salvaging drill bucket, and carrying out repeated circulating construction to ensure the slag removal effect of the hole bottom.
Optionally, S30 includes:
s31, hoisting the wall brushing drill bit to the position near the pile foundation construction position;
s32, detaching the slag dragging drill bit of the rotary drilling rig and replacing the slag dragging drill bit with the wall brushing drill bit;
s33, after the wall brushing drill bit is installed in place, performing expansion and contraction trial operation on site to ensure that the wall brushing drill bit can be smoothly opened and closed when brushing the wall in the pile hole;
and S34, when the brush handle is in a contraction state, the brush handle is lowered to the bottom of the hole along with a drill rod of the rotary drilling rig.
Optionally, S40 includes:
s41, the wall brushing drill bit is lowered to the bottom of the pile hole, and the rotary drilling rig pressurizes to enable the wall brushing drill bit to apply pressure to the bottom wall of the pile hole, so that the brush handle is fully contacted with the bottom wall of the pile hole;
and S42, rotating the wall-brushing drill bit in the positive direction, and fully stretching the brush handle after three circles.
Optionally, S50 includes:
s51, continuing to rotate the wall brushing drill bit in the positive direction, and performing mud-skin cleaning construction on the hole wall of the rock interval at the bottommost layer;
and S52, after the mud skin of the hole wall of the rock stratum section at the bottommost layer is cleaned, lifting the drill rod to clean the hole wall of the rock stratum section at the upper layer, continuously keeping the positive direction to rotate the drill bit to brush the wall, and repeating the operation until the wall is brushed to the height marking position of the rock stratum section.
Optionally, S60 includes:
s61, after the hole walls of the rock stratum section are completely cleaned, lowering the wall-brushing drill bit to the bottom of the pile hole again, and applying pressure to the bottom wall of the pile hole to enable the brush handle to be fully contacted with the bottom wall of the pile hole;
and S62, rotating the brush wall drill bit anticlockwise for multiple circles to enable the brush handle to contract inwards, and then lifting the brush wall drill bit out of the pile hole.
Optionally, after S60:
s71, washing the wall brushing device with clean water;
and S72, the wall brushing device which is washed clean can enter the pile hole again to perform hole wall mud skin cleaning operation of the rock interval, whether mud skin remains on the brush hair of the wall brushing device which puts out the pile hole is observed after repeated times, and whether the hole wall mud skin cleaning operation of the rock interval is finished is judged.
Compared with the prior art, the method for cleaning the hole wall of the rock section against pile pulling comprises the steps of opening the plurality of brush holders to enable the brush hairs of the brush holders to be in contact with the mud skin on the hole wall of the rock section, and cleaning the mud skin on the hole wall of the rock section in the process of rotating the wall brushing drill bit. Compared with the existing fixed type mode of cleaning and brushing mud skin by using the steel brush, when the wall brushing drill bit is placed or taken out, the plurality of brush handles are contracted, the soil layer section on the upper part is not affected, the wall brushing effect of the rock layer section on the lower part is not affected, and the wall brushing effect of the rock layer section is better. Meanwhile, as the wall brushing device is positioned at the bottom of the wall brushing drill bit, the wall brushing device can also effectively brush the wall of partial rock stratum of the hole bottom section. The problem of among the prior art, fixed steel brush structure is poor to the brush wall effect of rock stratum section is solved.
Drawings
FIG. 1 is a schematic flow chart of a method for cleaning the hole wall of a section against pile pulling provided by the invention;
FIG. 2 is a perspective view of a wall-brushing drill bit according to the method for brushing the hole wall of the anti-pile-driving section provided by the invention;
FIG. 3 is a schematic view of the steps of the method of the invention for cleaning the wall of the hole of the uplift section;
fig. 4 is a schematic view of the steps of shrinking the brush handle in the method for brushing the hole wall of the uplift pile section provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1 to 4, a preferred embodiment of the present invention is shown.
In the embodiment of the invention, the method for cleaning the hole wall of the section where the uplift pile is inserted into the rock comprises the following steps:
s10, drilling a hole to a designed pile bottom elevation by using a rotary drilling rig in a rotary drilling manner, and removing slag at the bottom of the hole by using a slag removing drilling bucket; it should be noted that the pile bottom given here is the bottom of a rotary drilling pile, the hole bottom is the bottom of a pile hole of the rotary drilling pile, the rotary drilling rig is provided with a drill rod, the drill rod is connected with different drill bits for rotary drilling, and is connected with a slag removing drilling bucket for hole bottom slag removal.
S30, lowering the wall-brushing drill bit to the bottom of the hole, wherein the bottom of the wall-brushing drill bit is provided with a wall-brushing device, the wall-brushing device is provided with a plurality of brush holders 13 which are opened by positive rotation and contracted by negative rotation, and the end parts of the brush holders 13 are provided with bristles 131; in this embodiment, the forward direction is clockwise rotation, and the reverse direction is counterclockwise rotation, and certainly, according to actual situations, the forward direction may be counterclockwise rotation, and the reverse direction may be clockwise rotation, which is not described in detail.
S40, rotating in the positive direction to open a plurality of brush holders 13;
s50, rotating the wall brushing drill bit in the positive direction again, and cleaning mud on the hole wall of the rock stratum section until the mud is cleaned to the elevation position of the rock stratum section;
s60, rotating in the reverse direction to contract the brush holders 13 and taking out the wall drills.
In this embodiment, the plurality of brush holders 13 are opened, so that the brush bristles 131 of the brush holders 13 contact the mud on the wall of the rock stratum section, and the mud on the wall of the rock stratum section is cleaned in the process of rotating the wall-brushing drill. Compared with the existing fixed type mode of cleaning and brushing mud sheets by using steel brushes, when the wall brushing drill bit is placed down or taken out, the plurality of brush handles 13 are contracted, the upper soil layer section cannot be influenced, the wall brushing effect of the lower rock layer section cannot be influenced, and the wall brushing effect of the rock layer section is better. Meanwhile, as the wall brushing device is positioned at the bottom of the wall brushing drill bit, the wall brushing device can also effectively brush the wall of partial rock stratum of the hole bottom section.
Referring to fig. 2 to 3, in an embodiment of the present invention, the wall-brushing drill includes a barrel 11 and a wall-brushing device, the wall-brushing device includes a bottom plate 12, a plurality of brush holders 13 and a plurality of baffles 14, the bottom plate 12 is connected to the bottom of the barrel 11, the bottom plate 12 has a lower surface away from the barrel 11, the brush holders 13 are rotatably disposed on the lower surface of the bottom plate 12, the baffles 14 are fixed on the lower surface of the bottom plate 12, and the plurality of brush holders 13 and the plurality of baffles 14 are sequentially arranged around the bottom plate 12 in a staggered manner; when the brush holder 13 rotates to abut against the baffle 14 on one side, the brush holder 13 is in an open state, and when the brush holder 13 rotates to abut against the baffle 14 on the other side, the brush holder 13 is in a contracted state.
Above-mentioned stack shell 11 is cylindricly, and the drilling rod mounting hole confession drilling rod interlude is passed through at its top to wear to establish the bolt through at its side, make the drilling rod and this stack shell 11's top fixed connection. In addition, in this embodiment, the bottom of the cylinder 11 and the bottom plate 12 are welded to each other for on-site fabrication, but it is preferable that the cylinder 11 and the bottom plate 12 are integrally formed.
The brush 131 is a wire brush 131 so as to have sufficient strength when brushing the wall. When the brush holder 13 is rotated to abut against the baffle plate 14 on one side, the brush 131 of the brush holder 13 extends out of the edge of the bottom plate 12, the brush holder 13 is opened, and when the brush holder 13 is rotated to abut against the baffle plate 14 on the other side, the brush holder 13 is contracted, and the brush 131 is located inside the edge of the bottom plate 12.
Referring to fig. 2, in an embodiment of the present invention, a plurality of baffles 14 are uniformly spaced around the bottom plate 12, and the baffles 14 are offset from the center of the bottom plate 12.
In this embodiment, the number of the baffles 14 is the same as that of the brush holders 13, and the plurality of brush holders 13 are uniformly spaced, so that when the wall is opened, the opening angle of each brush holder 13 is the same, and the wall-brushing effect is better.
Specifically, the baffle 14 at least comprises a first baffle 14 and a second baffle 14 which are adjacent to each other, and an included angle between the first baffle 14 and the second baffle 14 is an obtuse angle.
Thus, when the brush holder 13 is opened, the self-contraction state is more opened, and the brush holder 13 is prevented from automatically retracting when the brush wall is operated, so that the effect of the brush holder 13 is ensured.
Thus, on the basis of the above, the number of the baffle plates 14 given in the present embodiment is three, and each baffle plate 14 extends to connect another adjacent baffle plate 14.
Specifically, three baffle plates 14 enclose to form an equilateral triangle, and the included angle between adjacent baffle plates 14 is 120 °, in this embodiment, each baffle plate 14 extends to another adjacent baffle plate 14 for welded connection, and the baffle plate 14 itself is welded connection with the bottom plate 12, so as to realize stable fixation of the plurality of baffle plates 14, of course, in other embodiments, the plurality of baffle plates 14 may also be formed integrally, which is not described in detail.
Of course, in other embodiments, the number of the baffles 14 is four, and at this time, a right angle is formed between the first baffle 14 and the second baffle 14, or the number of the baffles 14 may also be five, and so on, which is not described in detail.
Referring to fig. 2, in an embodiment of the present invention, the other end of handle 13 away from bristles 131 has a through hole, a shaft pin 132 is fixed on base plate 12, shaft pin 132 is transmitted through the through hole, and handle 13 rotates around shaft pin 132.
Specifically, the bottom plate 12 is provided with a mounting hole, the shaft pin 132 penetrates through the through hole and the mounting hole, one end of the shaft pin 132 is a wide end, the wide end abuts against the lower portion of the brush holder 13, the lower portion of the brush holder 13 is provided with a circular notch at the through hole, the wide end section is arranged in the circular notch, the lower surface of the shaft pin 132 is flush with the lower surface of the brush holder 13, the other end of the shaft pin 132 is provided with a thread, the other end of the shaft pin 132 penetrates through the mounting hole, the shaft pin 132 is fixed through a nut, and the brush holder 13 can rotate around the shaft pin 132.
In combination with the above, the baffle plate 14 includes at least a first baffle plate 14 and a second baffle plate 14 adjacent to each other, and the pivot pin 132 is located at a corner between the first baffle plate 14 and the second baffle plate 14.
Moreover, as the plurality of baffle plates 14 are uniformly arranged around the bottom plate 12 at intervals, and the baffle plates 14 are arranged eccentrically from the center of the bottom plate 12, the shaft pin 132 is arranged at an included angle between the first baffle plate 14 and the second baffle plate 14, so that the brush holder 13 can stably abut against the baffle plates 14 on two sides when rotating, and along the direction of the first baffle plate 14, the edge from the shaft pin 132 to the bottom plate is shorter than the length from the shaft pin 132 to the end part of the brush hair 131, and along the direction of the second baffle plate 14, the edge from the shaft pin 132 to the bottom plate is longer than the length from the shaft pin 132 to the end part of the brush hair 131, so as to realize an opening state and a contracting state, and the rotating angle of the brush holder 13 is obtuse, so that the effect of the.
Further, when brush holder 13 is rotated to abut against stopper 14 and brush 131 of brush holder 13 protrudes from the edge of base plate 12, the length of brush holder 13 extends in a direction passing through the center of base plate 12.
Thus, when handle 13 is in the open position, the length of handle extending beyond the edge of base 12 is the longest, so that it can be rotated to open or close, avoiding jamming during rotation, and optimizing the wall brushing effect.
Furthermore, two sides of the brush handle 13 are respectively arranged in a plane shape, and two sides of the baffle plate 14 are respectively arranged in a plane shape.
Therefore, no matter which state the brush holder 13 rotates to, the brush holder 13 can be guaranteed to stably abut against the baffle 14, the brush holder 13 is prevented from being damaged, and the brush holder is stably arranged in various states.
Referring to fig. 2, in one embodiment of the present invention, the end of the handle 13 is provided with a plurality of spaced bristles 131.
Through a plurality of brush hairs 131 to increase brush holder 13 area, improve brush wall efficiency, it is specific, a plurality of brush hairs 131 are vertical interval arrangement, and in this embodiment, the quantity of brush hairs 131 is two, like this, in order to avoid brush holder 13 overweight, and it is swinging at rotatory in-process to be convenient for, and of course, as required, the quantity of brush hairs 131 also can be more, and is not repeated.
In addition, the bristles 131 are arranged in a diverging manner in a direction away from the handle 13.
Therefore, the wall brushing area is increased, and meanwhile, the rigidity of the wall brushing area is prevented from damaging the hole wall, so that the wall brushing effect is better.
Referring to fig. 2, in an embodiment of the present invention, a pressure relief hole 12a is formed in the middle of the bottom plate 12, a hollow cavity is formed in the barrel 11, and the pressure relief hole 12a is communicated with the hollow cavity.
Through this pressure release hole 12a to prevent that this brush wall drill bit from leading to transferring the drill bit process obstructed because of the drill bit is inside to dip in mud slowly when going deep into the stake hole, thereby influence the efficiency of construction. In the embodiment of the present invention, the pressure relief hole 12a is located in an area surrounded by a plurality of baffles 14.
Referring to fig. 1 to 4, in an embodiment of the present invention, before S30:
s21, cutting the bottom of the drill to form a smooth cutting surface at the bottom and form the barrel body 11; the diameter of the barrel 11 is the same as or slightly smaller than the diameter of the brushwall bore for lowering or retrieving the brushwall bit.
S22, prefabricating the bottom plate 12 and the baffle plate 14 by using steel plate materials, and welding and installing;
s23, welding the bottom plate 12 and the bottom of the barrel body 11 in a full-welding mode;
s24, brush holder 13 is prepared, a plurality of brush holders 13 are mounted on base plate 12, bristles 131 are inserted into brush holders 13, and bristles 131 are scattered in a divergent manner.
In this embodiment, taking an uplift pile wall-brushing drill with a diameter of phi 800mm as an example, the length of the cylinder body 11 is 1.2m, which is consistent with the length of a commonly adopted rotary drilling drill. The bottom plate 12 is made of a 3cm thick steel plate, the diameter is phi 800mm, three baffle plate 14 mounting grooves are engraved on the bottom plate 12, the depth of each mounting groove is 3mm, the width of each mounting groove is 30mm, and the center points of equilateral triangles formed by intersecting the three mounting grooves coincide with the center of the bottom plate 12; a pressure relief hole 12a with the diameter of 150mm is formed in the middle of the bottom plate 12; three mounting holes with the diameter phi of 100mm are uniformly distributed at the position 250mm away from the center of the bottom plate 12 according to the mounting groove of the baffle 14 and are used for subsequently mounting the brush holder 13.
The baffle 14 is a flat cuboid steel block with a regular shape, is made of a steel plate with the thickness of 28mm, has the length of 560mm and the height of 140mm, is placed in the mounting groove of the bottom plate 12, is welded and connected, and completes firm splicing.
Two steel wire rope mounting holes with the diameter phi of 30mm are formed in the side face of the short side of the brush handle 13, the distance between the two holes is 70mm, two fastening steel wire rope bolt insertion holes with the diameter phi of 30mm are formed in the side face of the long side of the brush handle 13, the side face of the short side of the brush handle 13 needs to be longitudinally deeply cut for 200mm, a cutting seam is formed, and therefore the steel wire ropes can be smoothly inserted into the mounting holes subsequently.
A strand of steel wire rope with the diameter of 26mm is inserted into the two mounting holes of each brush handle 13, and the steel wire rope is screwed and fixed by two expansion bolts from the bolt insertion holes on the side surface, so that the steel wire rope is prevented from loosening and falling off when the wall is brushed. After the steel wire ropes are arranged, the steel wire ropes are scattered in a divergent shape, and the steel wire ropes are the bristles 131.
Referring to fig. 1 to 4, in an embodiment of the present invention, S10 includes:
s11, lofting the pile hole on the spot by using a total station, and positioning and marking;
s12, after the rotary drilling rig is installed and centered, connecting and starting a slurry circulating system to start drilling;
s13, drilling the soil layer section by adopting a rotary drilling bucket; when the drill bit rotates clockwise, the drill cuttings enter the drill bucket, the drill bit rotates anticlockwise after the drill bit is filled with the near bucket, the bottom plate is positioned by the positioning block and seals the bottom opening, and the drill bit is lifted to the ground for soil unloading.
S14, replacing a cutting bit barrel drill for drilling in the rock stratum section, cutting and breaking rock by a cutting bit of the cutting bit barrel drill, replacing a slag removing drill bucket for removing slag, and repeatedly performing circulating operation until a hole is drilled to reach the designed pile bottom elevation;
and S15, carrying out slag salvaging operation by using the slag salvaging drill bucket, and carrying out repeated circulating construction to ensure the slag removal effect of the hole bottom.
Above-mentioned each drill bit all is connected with the drilling rod of digging the rig soon, like this, directly change the drill bit when the construction can, need not move the apparatus to improve the efficiency of construction. Through the steps, the rotary digging pile can be obtained.
After the pile foundation construction final hole is formed, a slag-dragging drilling bucket is adopted to carry out pile bottom hole cleaning operation; placing the slag-dragging drilling bucket into the bottom of a hole, then rotating a drill rod in a forward direction, pressing downwards while rotating, stopping rotating after multiple circles of rotation, and lifting a drill bit to dump drill slag; if more drilling slag is found in the drill bit, the hole cleaning operation needs to be carried out again until the drilling slag at the bottom of the hole is thoroughly cleaned, so as to ensure that the thickness of the sediment at the bottom of the hole meets the requirement.
Referring to fig. 1 to 4, in an embodiment of the present invention, S30 includes:
s31, hoisting the wall brushing drill bit to the position near the pile foundation construction position;
s32, detaching the slag fishing drill bit of the rotary drilling rig and replacing the slag fishing drill bit with a wall brushing drill bit;
s33, after the wall brushing drill bit is installed in place, performing expansion and contraction trial operation on site to ensure that the wall brushing drill bit can be smoothly opened and closed when brushing the wall in the pile hole;
s34, when the brush handle 13 is in a contraction state, the brush handle is lowered to the bottom of the hole along with a drill rod of the rotary drilling rig.
Thus, through the trial operation, the brush handle 13 of the wall-brushing drill bit is prevented from being clamped, and smooth opening and closing are ensured when the wall-brushing drill bit is placed in the pile hole for use.
Referring to fig. 1 to 4, in an embodiment of the present invention, S40 includes:
s41, lowering the wall brushing drill bit to the bottom of the pile hole, and pressurizing the rotary drilling rig to enable the wall brushing drill bit to apply pressure to the bottom wall of the pile hole so that the brush handle 13 is fully contacted with the bottom wall of the pile hole;
s42, rotating the wall drill bit in the positive direction, and making the brush handle 13 fully open and extend after three turns.
After the brush handle 13 is contacted with the bottom wall of the pile hole, the brush wall drill bit is rotated, under the action of the friction force of the bottom wall of the pile hole, the brush handle 13 and the brush wall drill bit form relative motion, so that the brush handle 13 is expressed as automatic outward extending until the brush handle 13 is opened, compared with the method that the brush handle 13 is opened by the centrifugal force of rotating and swinging, the method can ensure that the brush handle 13 arranged in the pile hole is opened, and meanwhile, the brush handle 13 under the opening state can not be easily contracted, and still needs a certain external force.
Receiving the above, S50 includes:
s51, continuously keeping the positive direction to rotate the wall brushing drill bit, and performing mud-skin cleaning construction on the hole wall of the rock stratum section at the bottommost layer;
and S52, after the mud skin of the hole wall of the rock stratum section at the bottommost layer is cleaned, lifting the drill rod to clean the hole wall of the rock stratum section at the upper layer, continuously keeping the positive direction to rotate the drill bit to brush the wall, and repeating the operation until the wall is brushed to the height marking position of the rock stratum section.
Therefore, the wall is gradually lifted, so that the wall of the hole wall of the rock stratum section is completely brushed, in the embodiment, the brushing of the hole wall of each rock stratum section needs 3-5 min according to the situation of the on-site stratum, and the lifting height is 10cm each time.
After the brushing is completed, S60 includes:
s61, after the wall of the rock interval is completely cleaned, lowering the wall-brushing drill bit to the bottom of the pile hole, and applying pressure to the bottom wall of the pile hole to ensure that the brush handle 13 is fully contacted with the bottom wall of the pile hole;
s62, rotating the wall-brushing drill bit in a rotary mode for multiple circles anticlockwise to enable the brush handle 13 to contract inwards, and then lifting the wall-brushing drill bit out of the pile hole.
Similarly, under the action of the friction force at the bottom of the hole, the brush handle 13 and the drill bit on the brush wall move relatively, so that the brush handle 13 is expressed as 'self-retracting' until the brush handle 13 is completely retracted. After the shrinkage is finished, the wall brushing drill bit is lifted out of the pile hole, so that pile body quality risks such as hole collapse and the like caused by the fact that the brush bristles 131 can damage and disturb the side wall of the soil layer section in the pile hole are effectively avoided.
Referring to fig. 1 to 4, in an embodiment of the present invention, after S60:
s71, washing the wall brushing device with clean water;
and S72, the wall brushing device which is washed clean can be put into the pile hole again to perform hole wall mud skin cleaning operation of the rock interval, whether mud skin remains on the brush bristles 131 of the wall brushing device which puts out the pile hole is observed after repeated times, and whether the hole wall mud skin cleaning operation of the rock interval is finished is judged.
The wall brushing device is washed by clean water to remove the muck and mud skin adhered to the wall brushing device, and whether the wall of the rock interval is completely brushed or not can be directly obtained by observing whether the mud skin is remained on the brush bristles 131 or not, so that the rock interval is completely brushed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for cleaning the hole wall of a section in which a counterpile is pulled into a rock is characterized by comprising the following steps:
s10, drilling a hole to a designed pile bottom elevation by using a rotary drilling rig in a rotary drilling manner, and removing slag at the bottom of the hole by using a slag removing drilling bucket;
s30, lowering a wall brushing drill bit to the bottom of the hole, wherein the bottom of the wall brushing drill bit is provided with a wall brushing device, the wall brushing device is provided with a plurality of brush holders which expand through forward rotation and contract through reverse rotation, and the ends of the brush holders are provided with bristles;
s40, rotating in the positive direction to open the brush holders;
s50, rotating the wall brushing drill bit in the positive direction again, and brushing mud on the hole wall of the rock stratum section until the mud is brushed to the elevation position of the rock stratum section;
and S60, rotating in the opposite direction to shrink the brush holders and taking out the brush wall drill bits.
2. The method for cleaning the hole wall of the uplift pile section as claimed in claim 1, wherein the wall-brushing drill bit comprises a barrel body and the wall-brushing device, the wall-brushing device comprises a bottom plate, a plurality of brush handles and a plurality of baffle plates, the bottom plate is connected with the bottom of the barrel body, the bottom plate is provided with a lower surface facing away from the barrel body, the brush handles are rotatably arranged on the lower surface of the bottom plate, the baffle plates are fixed on the lower surface of the bottom plate, and the plurality of brush handles and the plurality of baffle plates are sequentially arranged in a staggered manner around the bottom plate; when the brush holder rotates to the baffle on one side of the butt joint, the brush holder is in an open shape, and when the brush holder rotates to the baffle on the other side of the butt joint, the brush holder is in a contracted shape.
3. The method for cleaning the hole wall of the section in which the uplift pile is inserted is characterized in that a pressure relief hole is formed in the middle of the bottom plate, a hollow cavity is formed in the barrel body, and the pressure relief hole is communicated with the hollow cavity.
4. A method of cleaning the walls of a hole in a section of a uplift pile as claimed in claim 2 or claim 3, wherein prior to S30:
s21, cutting the bottom of the drill bit to form a smooth cutting surface at the bottom and form the cylinder body;
s22, prefabricating the bottom plate and the baffle plate by using a steel plate material, and welding and installing;
s23, welding the bottom plate and the bottom of the cylinder body in a full-welding mode;
s24, manufacturing the brush holders, mounting a plurality of brush holders on the base plate, inserting the bristles into the brush holders, and dispersing the bristles in a divergent manner.
5. A method of cleaning the bore wall of a pilaster driving section according to any one of claims 1 to 3, wherein S10 comprises:
s11, lofting the pile hole on the spot by using a total station, and positioning and marking;
s12, after the rotary drilling rig is installed and centered, connecting and starting a slurry circulating system to start drilling;
s13, drilling the soil layer section by adopting a rotary drilling bucket;
s14, replacing a cutting pick barrel drill for drilling in the rock stratum section, cutting and breaking rock by a cutting pick of the cutting pick barrel drill, replacing the slag removing drill bucket for removing slag, and repeatedly performing circulating operation until a drilled hole reaches the designed pile bottom elevation;
and S15, carrying out slag salvaging operation by using the slag salvaging drill bucket, and carrying out repeated circulating construction to ensure the slag removal effect of the hole bottom.
6. A method of cleaning the bore wall of a pilaster driving section according to any one of claims 1 to 3, wherein S30 comprises:
s31, hoisting the wall brushing drill bit to the position near the pile foundation construction position;
s32, detaching the slag dragging drill bit of the rotary drilling rig and replacing the slag dragging drill bit with the wall brushing drill bit;
s33, after the wall brushing drill bit is installed in place, performing expansion and contraction trial operation on site to ensure that the wall brushing drill bit can be smoothly opened and closed when brushing the wall in the pile hole;
and S34, when the brush handle is in a contraction state, the brush handle is lowered to the bottom of the hole along with a drill rod of the rotary drilling rig.
7. A method of cleaning the bore wall of a pilaster driving section according to any one of claims 1 to 3, wherein S40 comprises:
s41, the wall brushing drill bit is lowered to the bottom of the pile hole, and the rotary drilling rig pressurizes to enable the wall brushing drill bit to apply pressure to the bottom wall of the pile hole, so that the brush handle is fully contacted with the bottom wall of the pile hole;
and S42, rotating the wall-brushing drill bit in the positive direction, and fully stretching the brush handle after three circles.
8. A method of cleaning the bore wall of a pilaster driving section according to any one of claims 1 to 3, wherein S50 comprises:
s51, continuing to rotate the wall brushing drill bit in the positive direction, and performing mud-skin cleaning construction on the hole wall of the rock interval at the bottommost layer;
and S52, after the mud skin of the hole wall of the rock stratum section at the bottommost layer is cleaned, lifting the drill rod to clean the hole wall of the rock stratum section at the upper layer, continuously keeping the positive direction to rotate the drill bit to brush the wall, and repeating the operation until the wall is brushed to the height marking position of the rock stratum section.
9. A method of cleaning the bore wall of a pilaster driving section according to any one of claims 1 to 3, wherein S60 comprises:
s61, after the hole walls of the rock stratum section are completely cleaned, lowering the wall-brushing drill bit to the bottom of the pile hole again, and applying pressure to the bottom wall of the pile hole to enable the brush handle to be fully contacted with the bottom wall of the pile hole;
and S62, rotating the brush wall drill bit anticlockwise for multiple circles to enable the brush handle to contract inwards, and then lifting the brush wall drill bit out of the pile hole.
10. A method of cleaning the bore wall of a pilastered section as claimed in any one of claims 1 to 3, wherein after S60:
s71, washing the wall brushing device with clean water;
and S72, the wall brushing device which is washed clean can enter the pile hole again to perform hole wall mud skin cleaning operation of the rock interval, whether mud skin remains on the brush hair of the wall brushing device which puts out the pile hole is observed after repeated times, and whether the hole wall mud skin cleaning operation of the rock interval is finished is judged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396126.7A CN112610186B (en) | 2020-12-03 | 2020-12-03 | Method for cleaning hole wall of section for resisting pile pulling in rock |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011396126.7A CN112610186B (en) | 2020-12-03 | 2020-12-03 | Method for cleaning hole wall of section for resisting pile pulling in rock |
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| CN112610186B CN112610186B (en) | 2022-04-19 |
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| CN112610186B (en) | 2022-04-19 |
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