CN108729445B - Drill bit for breaking waste solid piles and method for breaking old solid piles and filling new piles - Google Patents
Drill bit for breaking waste solid piles and method for breaking old solid piles and filling new piles Download PDFInfo
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- CN108729445B CN108729445B CN201810916598.7A CN201810916598A CN108729445B CN 108729445 B CN108729445 B CN 108729445B CN 201810916598 A CN201810916598 A CN 201810916598A CN 108729445 B CN108729445 B CN 108729445B
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- 239000007787 solid Substances 0.000 title claims abstract description 68
- 239000002699 waste material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007790 scraping Methods 0.000 claims description 69
- 238000005520 cutting process Methods 0.000 claims description 46
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 230000036346 tooth eruption Effects 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 11
- 238000010276 construction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 125000003003 spiro group Chemical group 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
-
- 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
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a drill bit for breaking waste solid piles and a method for breaking waste solid piles and pouring new piles by using the drill bit, wherein the drill bit comprises a mandrel and a retainer ring, a plurality of first scrapers and second scrapers are arranged between the mandrel and the retainer ring, the inner ends of the two scrapers are connected with the mandrel, and the outer ends of the two scrapers are connected with the retainer ring; the bottom of each scraper is provided with a bottom bevel edge with lower outside and higher inside, the bottom bevel edge of the first scraper is provided with a plurality of teeth, and the bottom bevel edge of the second scraper is provided with a plurality of picks; the key point of the method is that: the two steps of breaking the old pile and forming the new pile are combined into one, and the two steps are synchronously carried out, and the solid pile is broken by using the teeth and the cutting teeth. The drill bit and the method can effectively crush the solid pile, and have the advantages of high efficiency and low cost.
Description
Technical Field
The invention relates to the technical field of building foundation construction, in particular to a drill bit for breaking waste solid piles and a method for breaking waste solid piles and pouring new piles by using the drill bit.
Background
In engineering construction, a short and old broken building is often required to be dismantled, and then a higher and newer building is constructed in an old site, so that the problems of dismantling waste piles in the site and pouring new piles are involved. The application aims at breaking the waste solid piles, and the solid piles are understood in a broad sense, and include bored piles, CFG piles, solid precast piles and the like.
The process of the breaking construction of the waste piles in the prior art is as follows: and (3) extracting the waste tubular piles on the foundation by using a pile extractor with pile extracting sleeves, reaming and deepening the residual pile holes after pile extraction to form larger and deeper pile holes, cleaning the pile holes, putting a reinforcement cage, and pouring concrete to form new bored cast-in-situ piles. Thus, the old tubular pile with small bearing capacity is pulled out, and the new bored pile with larger diameter, deeper pile and stronger bearing capacity is poured.
However, the scheme for modifying the waste piles in the prior art has a great limitation that the prior art can only treat the pipe piles, and once the solid concrete piles are involved, the prior art cannot be used, and the technical problem which puzzles technicians in the industry for many years is also formed. However, even for the tubular pile, the scheme in the prior art has more defects, such as the limited length of the pile pulling sleeve of the pile pulling machine is generally not more than 20 meters, so that the tubular pile within the depth of 20 meters can be pulled out only; moreover, for a construction unit, a set of pile pulling equipment is specially provided, if the pile pulling equipment is purchased, the utilization rate is low and not cost-effective, if the pile pulling equipment is rented, the rent is very high, and the equipment transfer cost is also required to be borne, so that the economic benefit is poor, the equipment transfer is time-consuming and labor-consuming, and the pile pulling equipment is difficult to send in time, so that the construction period is delayed; moreover, the process of pulling out and drilling larger and deeper holes of the old pile is performed stepwise, so that the construction efficiency is not high.
Disclosure of Invention
The invention aims to solve the technical problem of providing the drill bit for breaking the waste solid piles, which can effectively break the solid piles, and has the advantages of high efficiency and low cost.
The invention provides a drill bit for breaking waste solid piles, which comprises a mandrel and a retainer ring, wherein the top of the mandrel is provided with a connecting part for being in butt joint with a spiral drill rod, a plurality of first scraping plates and second scraping plates are arranged between the mandrel and the retainer ring, the inner ends of the two scraping plates are connected with the mandrel, and the outer ends of the two scraping plates are connected with the retainer ring; the bottom of each scraper blade is provided with a bottom bevel edge with the outer lower part and the inner higher part, the bottom bevel edge of the first scraper blade is provided with a plurality of teeth, the bottom bevel edge of the second scraper blade is provided with a plurality of picks, the inner diameter of the retainer ring is larger than the outer diameter of the solid pile to be broken, and one tooth at the bottommost part of the first scraper blade protrudes downwards to form a retainer ring bottom ring surface.
Compared with the prior art, the drill bit for breaking the waste solid piles has the following advantages and effects:
before the drill is put down, a retainer ring of the drill bit is sleeved on the top of a solid pile to be crushed, and the retainer ring is limited at the beginning, so that teeth of a tooth can quickly and effectively crush the solid pile concrete and grind reinforcing steel bars on a solid pile reinforcement cage, the reinforcing steel bars are ground to be fine ground to enable the reinforcing steel bars to be easy to hinge, cutting teeth can further crush the solid pile concrete and hinge the reinforcing steel bars, and meanwhile, the cutting teeth can hook and wind the broken reinforcing steel bars to bring the reinforcing steel bars out of a drill hole; in addition, as a whole, a plurality of scraping plates with high inner parts and low outer parts form a conical cutting surface together, and in the process of drilling, the solid pile is cut into a conical structure, so that the functions of stable guiding, ensuring vertical drilling and preventing drill rod deflection are achieved; in conclusion, the drill bit solves the technical problems which always plague the industry for many years, namely, the crushing and cleaning of the solid piles are realized. Moreover, the drill bit disclosed by the invention combines the two steps of old pile cleaning and new pile hole forming into one, and the two steps are synchronously carried out, so that the construction efficiency is improved; the depth of the old pile removed is not limited by the pile pulling sleeve of the pile pulling machine, and different depths can be drilled according to the needs so as to remove the old solid piles with the depth exceeding 20 meters; moreover, the old pile dismantling equipment is integrated with the drill bit, so that special pile pulling equipment is not required to be additionally arranged, the holding cost, the leasing cost and the transition cost of the pile pulling equipment are reduced, and the old pile dismantling equipment is taken along with use, and the special pile pulling equipment is not required to wait for transition as in the prior art, so that the construction period is prevented from being delayed; moreover, the drill bit provided with the cutting pick and the tooth teeth has high cutting efficiency, good piling effect, thicker and deeper and can be put into rock, so that the new pile has strong bearing capacity and meets the requirements of modern high-rise buildings. Of course, the drill bit can be constructed according to the pile diameter of the waste solid piles, so that drill bit specifications of different sizes are adopted.
Preferably, the bottom bevel edge of the first scraper blade is lower than the bottom bevel edge of the second scraper blade, so that the teeth on the first scraper blade can firstly contact the solid pile body to play a role in crushing concrete and grinding the reinforcing steel bars, the reinforcing steel bars are ground and deformed to become slender and easy to break, the cutting teeth on the second scraper blade can lag a certain time to contact the solid pile body to play a role in assisting in crushing concrete and reaming the reinforcing steel bars, the pile crushing process of the drill bit is more layering due to the time difference between the teeth and the cutting teeth, the teeth are firstly ground and deformed and then are reamed and hooked and wound by the cutting teeth, and the two kinds of drilling teeth are mutually matched and reasonable in design.
As a further preferable mode, the mandrel is rotatably sleeved with the outer sleeve, the inner end of the first scraping plate is fixed with the outer sleeve, and the outer end of the first scraping plate is fixed with the check ring; the pipe wall of the outer sleeve is provided with P-shaped through holes which are in one-to-one correspondence with the second scraping plates, the P-shaped through holes are formed by transverse outer reaming at the upper part and straight holes at the lower part, the height of the transverse outer reaming is matched with the height of the inner end of the second scraping plates, and the width of the straight holes is matched with the width of the inner end of the second scraping plates; the inner circumferential surface of the retainer ring is provided with P-shaped limit grooves which are in one-to-one correspondence with the second scraping plates, each P-shaped limit groove is composed of a transverse expansion groove at the upper part and a straight groove at the lower part, the height of the transverse expansion groove is matched with the height of the outer end of the second scraping plates, and the width of the straight groove is matched with the width of the outer end of the second scraping plates; each second scraper passes through the corresponding P-shaped through hole, the inner end of the second scraper is fixed with the mandrel, and the outer end of the second scraper is clamped into the corresponding P-shaped limit groove.
The action principle of the structure is that when the pile body is drilled, two ends of the second scraping plate are respectively clamped in the transverse outer reaming groove and the transverse outer reaming groove, the second scraping plate and the cutting pick are positioned at relatively higher positions in the check ring, so that the height difference between the cutting pick and the tooth wheel in space and the time difference of the drilling are caused to lead the tooth wheel to be in contact with the pile body to break concrete greatly and grind the steel bars in advance, the advantage that the rock breaking strength of the tooth wheel is obviously larger than that of the cutting pick is exerted, and then the cutting pick is used for following the broken concrete and hinging the ground long and thin steel bars; after the drill bit is drilled down to a certain depth, the core pipe is reversely rotated, so that the second scraping plate is reversely rotated to be above the straight hole and the straight groove, and after the restriction of the transverse outward reaming and the transverse outward reaming groove is removed, the core pipe drives the second scraping plate to descend, so that the two ends of the second scraping plate descend to the bottoms of the straight hole and the straight groove, namely, the second scraping plate and the cutting pick are positioned at a relatively low position in the retainer ring, and the cutting pick can conveniently catch broken steel bars by winding hooks as much as possible when the drill bit is lifted up, namely, the cutting pick can maximally carry the broken steel bars out of the drill hole; when the drill bit is pulled out of the ground, the second scraping plate is located at the upper ends of the straight hole and the straight groove again in the process of cutting steel bars wound on the cutting pick, at the moment, workers can conveniently manually rotate the reset check ring at the drill hole, so that two ends of the second scraping plate are clamped into the transverse outer reaming groove and the transverse outer reaming groove again, and the steps of tripping, reversing, lifting and the like are convenient to repeat.
As still further preferred, be equipped with a plurality of cushion on the retaining ring, the cushion lower part is equipped with the turn-up, and cushion upper portion is equipped with the bolt hole, and the turn-up and the retaining ring hook of cushion, cushion upper portion and retaining ring spiro union, like this, outside a plurality of cushion of removable installation of retaining ring for protection retaining ring, avoid the retaining ring to wear away soon, moreover, foretell cushion dismouting is swift convenient, only need collude the turn-up of lower part and just can realize the quick installation of cushion with its upper portion spiro union again, like this, after old cushion wearing and tearing, can convenient and fast change new cushion.
The invention aims to solve the other technical problem of providing a method for breaking waste solid piles and pouring new piles by using the drill bit provided by the invention, which can effectively break the solid piles, and has the advantages of high efficiency and low cost.
The invention provides a method for breaking waste solid piles and pouring new piles by using a drill bit, which comprises the following steps:
firstly, removing soil around the top of a solid pile to be crushed to expose the pile top, driving a drill bit to descend, and enabling a retainer ring of the drill bit to cover the pile top of the solid pile for preliminary limiting; in the initial state, the inner end of the second scraping plate is positioned in the transverse outer reaming of the P-shaped through hole, the outer end of the second scraping plate is positioned in the transverse outer reaming groove of the P-shaped limiting groove, and at the moment, the second scraping plate and the cutting pick are positioned at the high position of the check ring;
the drill rod is driven to drill downwards, as the cutting pick of the second scraper blade is positioned at the high position of the retainer ring, the tooth wheel of the first scraper blade is firstly contacted with the solid pile and breaks the concrete of the pile body, meanwhile, the steel bars on the solid pile reinforcement cage are ground, the second scraper blade and the cutting pick positioned at the high position of the retainer ring follow up the broken solid pile concrete, and meanwhile, the cutting pick is used for reaming the steel bars of the steel bar cage and winding and hooking the steel bars separated from the steel bar cage; in the drilling process of the drill bit, drill slag is upwards through gaps between scraping plates, and is brought out of the ground by spiral blades of a drill rod;
after drilling a certain depth, reversely rotating the drill rod and the mandrel, enabling the inner end of the second scraping plate to rotate from the transverse outer reaming of the P-shaped through hole to the upper side of the straight hole and then to be pressed down to the bottom end of the straight hole, enabling the inner end of the second scraping plate to rotate from the transverse outer reaming of the P-shaped limiting groove to the upper side of the straight groove and then to be pressed down to the bottom end of the straight groove, further enabling the second scraping plate and the cutting pick to descend to the lower position of the check ring, and then continuously reversely rotating for a plurality of circles to ensure that the cutting pick hooks more broken steel bars;
then, a drill hole is lifted from the drill bit, in the lifting process, two ends of the second scraping plate can rise to the upper ends of the straight hole and the straight groove, then, a gas cutting method is used for cutting off the steel bars wound on the cutting pick of the drill bit, and the retainer ring is rotated, so that the two ends of the second scraping plate are clamped into the transverse external reaming groove and the transverse external reaming groove again;
continuously drilling down to a certain depth, reversely rotating to enable the cutting pick to hold the low-position hook steel bars, then pulling up to clean, resetting the check ring, and reciprocating in this way until the waste solid piles are completely removed, and then continuously drilling down to the design depth of the new piles; at this time, the old pile cleaning and the new pile pore-forming are completed;
and (5) clearing holes, sinking into a reinforcement cage and pouring new pile concrete.
After the steps are adopted, the method has the following advantages: the pile casing can cover the pile top of the solid pile, the pile is initially guided, each spoke type scraping plate forms a conical cutting surface during drilling, the solid pile is broken, stable guiding is continuously provided, and vertical downward drilling is ensured; when the concrete is drilled down, the teeth of the tooth and the cutting teeth are contacted in sequence and crush the concrete, so that the concrete has strong layering sense, high efficiency and thorough crushing; the cutting pick can be reduced when the pile is lifted, so that the cutting pick can fully hook the steel bars, the residual of the steel bars at the bottom of the hole is reduced to the maximum extent, and the quality of the subsequent pile forming is improved; the waste solid piles are crushed and the new piles are formed, so that the construction efficiency is further improved; the crushing depth of the waste solid piles is not limited, and the crushing depth exceeds 20 meters; special pile pulling equipment is not needed, so that the cost is saved; the new pile hole is thicker and deeper, and the bearing capacity is stronger.
Drawings
FIG. 1 is a schematic diagram of the front cross-sectional structure of the bit of the invention breaking waste solid piles in the lower position of the cutting pick.
FIG. 2 is a schematic diagram of the front cross-sectional structure of the bit of the invention breaking the waste solid pile.
Fig. 3 is a schematic structural view of the drill bit for breaking waste solid piles according to the present invention.
Fig. 4 is a schematic structural view of a mandrel, a connecting portion and a second scraper of the drill bit for breaking waste solid piles according to the present invention.
Fig. 5 is a schematic diagram of an exploded structure of the drill bit for breaking waste solid piles according to the present invention.
The drawing shows 1, a mandrel, 2, a retainer ring, 3, a connecting part, 4, a first scraping plate, 5, a second scraping plate, 6, a bolt hole, 7, a bottom bevel edge, 8, tooth teeth, 9, cutting teeth, 10, an outer sleeve, 11, a P-shaped through hole, 11.1, a transverse outer reaming, 11.2, a straight hole, 12, a P-shaped limiting groove, 12.1, a transverse outer reaming groove, 12.2, a straight groove, 13, a cushion block, 14 and a curled edge.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1, 2, 3, 4 and 5, the drill bit for breaking waste solid piles comprises a mandrel 1 and a retainer ring 2, wherein a connecting part 3 for butting with a spiral drill rod is arranged at the top of the mandrel 1.
A plurality of first scrapers 4 and second scrapers 5 are arranged between the mandrel 1 and the retainer ring 2, and the number of the first scrapers 4 and the second scrapers 5 in the embodiment is three. The first scraping plates 4 and the second scraping plates 5 are arranged at intervals, and all the scraping plates are uniformly distributed in the spoke type circumferential direction.
The bottom of each scraper blade is provided with a bottom bevel edge 7 with the outer lower part and the inner higher part, a plurality of teeth 8 are rotatably arranged on the bottom bevel edge 7 of the first scraper blade 4, and a plurality of cutting picks 9 are fixed on the bottom bevel edge 7 of the second scraper blade 5. The inner diameter of the retainer ring 2 is larger than the outer diameter of the solid pile to be broken, and one tooth wheel tooth 8 at the bottommost part of the first scraping plate 4 protrudes downwards to the bottom ring surface of the retainer ring 2.
The inner ends of the two scrapers are connected with the mandrel 1, and the outer ends are connected with the retainer ring 2. The connection mode can be fixed, namely, the inner ends of the two scrapers are fixed with the mandrel 1, and the outer ends of the two scrapers are fixed with the retainer ring 2. At this time, the bottom bevel edge 7 of the first blade 4 is lower than the bottom bevel edge 7 of the second blade 5, so that the teeth 8 break the pile first and the picks 9 break later.
The connection of the scraper to the mandrel 1 and the retainer ring 2 may also be of the following specific structure.
The mandrel 1 is rotatably sleeved with an outer sleeve 10, the inner end of the first scraping plate 4 is fixed with the outer sleeve 10, and the outer end of the first scraping plate 4 is fixed with the retainer ring 2; the pipe wall of the outer sleeve 10 is provided with three P-shaped through holes 11 which are in one-to-one correspondence with the three second scrapers 5, each P-shaped through hole 11 is composed of an upper transverse outer reaming 11.1 and a lower straight hole 11.2, the height of each transverse outer reaming 11.1 is identical with the height of the inner end of each second scraper 5, namely the height of each transverse outer reaming 11.1 is larger than or equal to the height of the inner end of each second scraper 5, and the width of each straight hole 11.2 is identical with the width of the inner end of each second scraper 5; i.e. the width of the straight hole 11.2 is greater than or equal to the width of the inner end of the second flight 5.
The inner circumferential surface of the retainer ring 2 is provided with P-shaped limit grooves 12 which are in one-to-one correspondence with the second scraping plates 5, the P-shaped limit grooves 12 are composed of upper transverse outward expansion grooves 12.1 and lower straight grooves 12.2, the height of the transverse outward expansion grooves 12.1 is larger than or equal to the height of the outer ends of the second scraping plates 5, and the width of the straight grooves 12.2 is larger than or equal to the width of the outer ends of the second scraping plates 5.
Each second scraping plate 5 passes through the corresponding P-shaped through hole 11, the inner end of the second scraping plate 5 is fixed with the mandrel 1, and the outer end of the second scraping plate 5 is clamped into the corresponding P-shaped limit groove 12.
The retainer ring 2 is detachably connected with a plurality of cushion blocks 13, specifically, the lower part of the cushion block 13 is provided with a curled edge 14, the upper part of the cushion block 13 is provided with a bolt hole 6, the curled edge 14 of the cushion block 13 is hooked with the retainer ring 2, and the upper part of the cushion block 13 is in threaded connection with the retainer ring 2.
To compensate for the lack of cutting force in the center of the retainer ring 2, a set of three teeth 8 are fixed to the bottom end of the spindle 1. The three teeth 8 are also lifted along with the inversion or lifting of the mandrel 1, namely, during normal running, the three teeth 8 are also positioned at the same high position as the cutting teeth 9, so that the influence of the too low position on the vertical running of the drill bit is avoided.
The method for breaking the waste solid piles and pouring the new piles by using the drill bit provided by the invention comprises the following steps.
And selecting a drill bit with proper specification according to the dimension of the outer diameter of the waste solid pile obtained by investigation.
Removing soil around the top of the solid pile to be crushed to expose the pile top, driving the drill bit to descend, and enabling the retainer ring 2 of the drill bit to cover the pile top of the solid pile for preliminary limiting; more specifically, three teeth 8 at the bottom of the three first scrapers 4 are abutted against the top of the solid pile for preliminary limiting.
In the initial state, the inner end of the second scraping plate 5 is positioned in the transverse outer reaming 11.1 of the P-shaped through hole 11, and the outer end of the second scraping plate 5 is positioned in the transverse outer reaming 12.1 of the P-shaped limiting groove 12, and at the moment, the second scraping plate 5 and the cutting pick 9 are positioned at the relatively high position of the retainer ring 2.
The drill rod is driven to drill downwards, as the cutting pick 9 of the second scraper 5 is positioned at the high position of the retainer ring 2, the tooth wheel 8 of the first scraper 4 is firstly contacted with the solid pile and breaks the concrete of the pile body, meanwhile, the steel bars on the solid pile reinforcement cage are ground, the second scraper 5 and the cutting pick 9 positioned at the high position of the retainer ring 2 continue to break the solid pile concrete, and meanwhile, the cutting pick 9 is used for reaming the steel bars of the reinforcement cage and winding the steel bars separated from the reinforcement cage; that is, the teeth 8 first contact and crush most of the concrete and grind the bar, and the picks 9 follow later, further crush the concrete and hinge the ground bar, thus allowing the drill slag to be crushed more thoroughly and easily discharged. In the drilling process, drilling slag is upwards through gaps between adjacent scraping plates, and is brought out of the ground by the spiral blades of the drill rod to be discharged. Of course, in the process of the drill rod running down, mud wall protection is synchronously carried out. When the mud is used for protecting the wall, water can be added into the mud in the stratum without special additional mud preparation, so that the cost can be further reduced.
After drilling to a certain depth like 2 meters, the drill rod and the mandrel 1 are reversely rotated, so that the inner end of the second scraper 5 rotates from the transverse outer reaming 11.1 of the P-shaped through hole 11 to the upper part of the straight hole 11.2 and then is pressed down to the bottom end of the straight hole 11.2, meanwhile, the inner end of the second scraper 5 rotates from the transverse outer reaming 12.1 of the P-shaped limiting groove 12 to the upper part of the straight groove 12.2 and then is pressed down to the bottom end of the straight groove 12.2, the second scraper 5 and the cutting pick 9 are further lowered to a relatively low position in the retainer ring 2, and then reversely rotates for a plurality of circles to ensure that the cutting pick 9 hooks broken steel bars as much as possible.
And then the drill bit is lifted out of the drill hole, and in the lifting process, the two ends of the second scraping plate 5 can be lifted to the upper ends of the straight hole 11.2 and the straight groove 12.2. After the drill bit is lifted out of the drill hole, the residual concrete blocks and the reinforcing steel bars in the hole are fished by the claw punching bucket, meanwhile, a worker cuts off the reinforcing steel bars wound on the tooth 8 and the pick 9 of the drill bit by using a gas cutting method outside the drill hole, and rotates the reset retainer ring 2, so that two ends of the second scraper 5 are clamped into the transverse outer reaming 11.1 and the transverse outer reaming groove 12.1 again. Of course, the rotary reset check ring 2 can be manually operated, or a bump is arranged on the outer circumference of the check ring 2, a section of spiral limiting inclined plane is fixed on the ground, the check ring 2 is blocked by the inclined plane in the ascending process, and can only ascend along the spiral of the inclined plane, that is, the rotary reset of the check ring 2 is synchronously completed in the process of pulling up the drill rod.
Continuously drilling down to a certain depth, reversely rotating to enable the cutting pick 9 to hold the low-position hook steel bars, then pulling up and cleaning, resetting the retainer ring 2, and reciprocating the retainer ring until the waste solid piles are completely removed, and continuously drilling down to the design depth of new piles; at this point, the old pile cleaning and the new pile hole forming are completed.
And (5) clearing holes, sinking into a reinforcement cage and pouring new pile concrete.
Claims (3)
1. The utility model provides a break drill bit of old and useless solid pile, it includes dabber (1) and retaining ring (2), dabber (1) top be equipped with be used for with auger stem butt joint connecting portion (3), its characterized in that: a plurality of first scrapers (4) and second scrapers (5) are arranged between the mandrel (1) and the retainer ring (2), the inner ends of the two scrapers are connected with the mandrel (1), and the outer ends of the two scrapers are connected with the retainer ring (2); the bottom of each scraper is provided with a bottom bevel edge (7) with lower outside and higher inside, the bottom bevel edge (7) of the first scraper (4) is provided with a plurality of teeth (8), the bottom bevel edge (7) of the second scraper (5) is provided with a plurality of picks (9), the inner diameter of the retainer ring (2) is larger than the outer diameter of a solid pile to be crushed, and one tooth (8) at the bottommost part of the first scraper (4) protrudes downwards out of the bottom ring surface of the retainer ring (2);
the bottom bevel edge (7) of the first scraping plate (4) is lower than the bottom bevel edge (7) of the second scraping plate (5);
the mandrel (1) is rotatably sleeved with an outer sleeve (10), the inner end of the first scraping plate (4) is fixed with the outer sleeve (10), and the outer end of the first scraping plate (4) is fixed with the retainer ring (2); the pipe wall of the outer sleeve (10) is provided with P-shaped through holes (11) which are in one-to-one correspondence with the second scraping plates (5), each P-shaped through hole (11) is composed of a transverse outer reaming (11.1) at the upper part and a straight hole (11.2) at the lower part, the height of each transverse outer reaming (11.1) is matched with the height of the inner end of each second scraping plate (5), and the width of each straight hole (11.2) is matched with the width of the inner end of each second scraping plate (5);
the inner circumferential surface of the retainer ring (2) is provided with P-shaped limit grooves (12) which are in one-to-one correspondence with the second scraping plates (5), each P-shaped limit groove (12) consists of an upper transverse outward expansion groove (12.1) and a lower straight groove (12.2), the height of each transverse outward expansion groove (12.1) is matched with the height of the outer end of each second scraping plate (5), and the width of each straight groove (12.2) is matched with the width of the outer end of each second scraping plate (5);
each second scraping plate (5) penetrates through the corresponding P-shaped through hole (11), the inner end of each second scraping plate (5) is fixed with the mandrel (1), and the outer end of each second scraping plate (5) is clamped into the corresponding P-shaped limiting groove (12).
2. The drill bit for breaking waste solid piles according to claim 1, wherein: a plurality of cushion blocks (13) are arranged on the retainer ring (2), curled edges (14) are arranged at the lower parts of the cushion blocks (13), bolt holes (6) are formed in the upper parts of the cushion blocks (13), the curled edges (14) of the cushion blocks (13) are hooked with the retainer ring (2), and the upper parts of the cushion blocks (13) are in threaded connection with the retainer ring (2).
3. A method for breaking waste solid piles and filling new piles by using the drill bit according to claim 2, which is characterized in that: the method comprises the following steps:
firstly, removing soil around the top of a solid pile to be crushed to expose the pile top, driving a drill bit to descend, and enabling a retainer ring (2) of the drill bit to cover the pile top of the solid pile for preliminary limiting; in the initial state, the inner end of the second scraping plate (5) is positioned in a transverse outer reaming (11.1) of the P-shaped through hole (11), the outer end of the second scraping plate is positioned in a transverse outer reaming groove (12.1) of the P-shaped limiting groove (12), and at the moment, the second scraping plate (5) and the cutting pick (9) are positioned at the high position of the check ring (2);
the drill rod is driven to drill downwards, as the cutting pick (9) of the second scraper blade (5) is positioned at the high position of the retainer ring (2), the tooth wheel teeth (8) of the first scraper blade (4) are firstly contacted with the solid pile and crush the concrete of the pile body, meanwhile, the steel bars on the solid pile reinforcement cage are ground, the second scraper blade (5) positioned at the high position of the retainer ring (2) and the cutting pick (9) follow up the crushed solid pile concrete, and meanwhile, the cutting pick (9) is used for reaming the steel bars of the steel reinforcement cage and winding the steel bars separated from the steel reinforcement cage; in the drilling process of the drill bit, drill slag is upwards through gaps between scraping plates, and is brought out of the ground by spiral blades of a drill rod;
after drilling a certain depth, reversely rotating the drill rod and the mandrel (1), enabling the inner end of the second scraper blade (5) to rotate from the transverse outer reaming (11.1) of the P-shaped through hole (11) to the upper portion of the straight hole (11.2) and then to be pressed down to the bottom end of the straight hole (11.2), enabling the inner end of the second scraper blade (5) to rotate from the transverse outer reaming groove (12.1) of the P-shaped limiting groove (12) to the upper portion of the straight groove (12.2) and then to be pressed down to the bottom end of the straight groove (12.2), further enabling the second scraper blade (5) and the cutting pick (9) to descend to the lower position of the retainer ring (2), and then continuously reversely rotating for a plurality of circles to ensure that the cutting pick (9) hooks more broken steel bars;
then, a drill hole is lifted from the drill bit, in the lifting process, two ends of the second scraping plate (5) can rise to the upper ends of the straight hole (11.2) and the straight groove (12.2), then, a gas cutting method is used for cutting off the steel bars wound on the cutting pick (9) of the drill bit, and the retainer ring (2) is rotated, so that the two ends of the second scraping plate (5) are clamped into the transverse outward reaming (11.1) and the transverse outward reaming groove (12.1) again;
continuously drilling down to a certain depth, reversely rotating to enable the cutting pick (9) to hold the low-position hook steel bars, then pulling up and cleaning, resetting the retainer ring (2), and reciprocating until the waste solid piles are completely removed, and continuously drilling down to the design depth of new piles; at this time, the old pile cleaning and the new pile pore-forming are completed;
and (5) clearing holes, sinking into a reinforcement cage and pouring new pile concrete.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810916598.7A CN108729445B (en) | 2018-08-13 | 2018-08-13 | Drill bit for breaking waste solid piles and method for breaking old solid piles and filling new piles |
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| CN201810916598.7A CN108729445B (en) | 2018-08-13 | 2018-08-13 | Drill bit for breaking waste solid piles and method for breaking old solid piles and filling new piles |
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| CN108729445A CN108729445A (en) | 2018-11-02 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110952916A (en) * | 2019-11-28 | 2020-04-03 | 武汉金瑞威基础工程有限公司 | Construction method for crushing and dismantling deep part of old building pile foundation |
| CN111877344A (en) * | 2020-06-24 | 2020-11-03 | 中煤江南建设发展有限公司 | Old pipe pile breaking method |
| CN113897958A (en) * | 2021-10-22 | 2022-01-07 | 中铁四局集团建筑工程有限公司 | Precise cutting construction method for rotary digging pile |
| CN114352185B (en) * | 2021-12-13 | 2024-01-02 | 广东君豪高科地下空间建设有限公司 | Variable speed drill bit for underground space development field |
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