CN110952916A - Construction method for crushing and dismantling deep part of old building pile foundation - Google Patents
Construction method for crushing and dismantling deep part of old building pile foundation Download PDFInfo
- Publication number
- CN110952916A CN110952916A CN201911193345.2A CN201911193345A CN110952916A CN 110952916 A CN110952916 A CN 110952916A CN 201911193345 A CN201911193345 A CN 201911193345A CN 110952916 A CN110952916 A CN 110952916A
- Authority
- CN
- China
- Prior art keywords
- pile
- hole
- drill bit
- foundation
- impactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010276 construction Methods 0.000 title claims abstract description 68
- 238000005553 drilling Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000012790 confirmation Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 210000000078 claw Anatomy 0.000 claims description 62
- 230000000670 limiting effect Effects 0.000 claims description 45
- 239000002893 slag Substances 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000956 alloy Substances 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
-
- 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
- E21B10/36—Percussion drill bits
-
- 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
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a construction method for crushing and dismantling the deep part of an old building pile foundation, which relates to the technical field of foundation construction and comprises the following steps: the method comprises the steps of construction preparation, pile position confirmation, in-place leveling of a drilling machine, pile breaking of a high-frequency impactor, drilling to the bottom elevation of a foundation pile, drill lifting, pile hole backfilling and the like. The invention uses the down-the-hole drill to break the foundation pile of the old building pile, and has the effects of smaller engineering quantity, lower construction cost and shorter construction period.
Description
Technical Field
The invention relates to the technical field of foundation construction, in particular to a construction method for deep crushing and dismantling of an old building pile foundation.
Background
Before the construction of a high-rise building, in order to prevent the high-rise building from unstable settlement, a pile foundation is generally manufactured at the bottom of the high-rise building, the pile foundation generally consists of a plurality of foundation piles which are uniformly arranged at intervals, the foundation piles are formed by pouring concrete, the structure is very firm, the length of the foundation piles is correspondingly increased along with the increase of the number of layers of the high-rise building, and the length of the general foundation piles is 10-20 meters.
When a high-rise building is dismantled and rebuilt, foundation piles at the bottom of the high-rise building also need to be broken and dismantled, and the breaking and dismantling mode adopted at present is as follows: the foundation around the foundation pile is excavated layer by layer, longer foundation piles are gradually exposed, and then the foundation pile is crushed section by section, because the strength and hardness of the pile body of the foundation pile are generally higher than those of the surrounding soil body, the engineering quantity is huge, the cost is very high, and the construction period of crushing and dismantling the whole pile foundation is long, so the improvement is needed.
Disclosure of Invention
The invention aims to provide a construction method for crushing and dismantling the deep part of an old building pile foundation, which has the advantages of smaller engineering quantity, lower construction cost and shorter construction period.
The above object of the present invention is achieved by the following technical solutions: a construction method for deep crushing and dismantling of an old building pile foundation comprises the following steps:
step one, construction preparation: the method comprises the following steps that a drilling machine, an air compressor, a high-frequency impactor and a down-the-hole drill bit enter a construction site, the high-frequency impactor is stably installed on an upright post, the down-the-hole drill bit is fixedly installed on the high-frequency impactor, the air compressor is communicated with the high-frequency impactor, the mechanical equipment is debugged, and the construction site is leveled before construction;
step two, pile position confirmation: determining the position of a foundation pile and marking according to an engineering drawing of an old building pile foundation;
thirdly, positioning and leveling the drilling machine: before drilling, a drilling machine is horizontally arranged, so that an upright post of the drilling machine is vertical to the ground, and a drill bit is aligned to a foundation pile;
fourthly, pile breaking by the high-frequency impactor: starting a drilling machine after 1-3 air compressors are started, wherein the air volume of a high-frequency impactor is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor is 15-60 kilonewtons, and a down-the-hole drill bit gradually crushes a foundation pile in the downward drilling process;
fifthly, drilling to the bottom elevation of the foundation pile to improve drilling: after the down-the-hole drill bit drills to the bottom elevation of the foundation pile, slowly lifting the high-frequency impactor and the down-the-hole drill bit;
step six, pile hole backfilling: and after the down-the-hole drill bit completely withdraws from the pile hole, pouring backfill into the pile hole.
By adopting the technical scheme, the foundation pile is gradually crushed directly by the high-speed rotating down-the-hole drill bit, the soil layer around the foundation pile is not needed to be excavated, and various foundation pit supports are not needed to be built for excavating the soil layer, so that the construction engineering quantity is greatly reduced, a large amount of construction cost is saved, and the speed of the down-the-hole drill bit for crushing the foundation pile is far higher than the speed of manually crushing the foundation pile after the foundation pile is excavated to an exposed state, so that the construction period of crushing and dismantling the whole pile foundation is obviously shortened, and the high-speed down-the-hole drill bit has high practicability and application prospect; while under the following conditions: the air volume of the high-frequency impactor is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor is 15-60 kilonewtons, the down-the-hole drill can break the foundation pile smoothly and efficiently, the broken slag of the foundation pile can be discharged smoothly, the down-the-hole drill can break the whole foundation pile smoothly, and the process is simple and safe.
The construction method is further provided with a plurality of dewatering wells according to the geological condition of the construction site, and water level pressure in the construction site is reduced by continuously pumping water through the dewatering wells during construction.
Through adopting above-mentioned technical scheme, when being under construction on the great ground of some soil property water content, abolish the in-process of foundation pile, underground water and silt that can be continuous later flow to the stake hole, in case underground water and silt are too much, cause the shrinkage cavity easily or collapse phenomenons such as, safety inadequately, through setting up precipitation well, can effective control water content, both make things convenient for the construction, also safer.
The invention is further arranged that in the fourth step, the verticality of the drill rod of the high-frequency impactor is kept and the hole-forming deflection rate is not more than 1% in the downward process of the down-the-hole drill bit.
By adopting the technical scheme, under the condition that the verticality of the drill rod is correct, the down-the-hole drill bit and the foundation pile are not easy to deviate or skew, and under the condition that the length of the foundation pile is longer, the down-the-hole drill bit can be ensured to completely break the whole foundation pile, so that the problem of incomplete foundation pile breaking caused by halfway skew of the down-the-hole drill bit is avoided.
The invention is further arranged that in the fourth step, when the shrinkage phenomenon occurs in the pile hole, the high-frequency impactor is kept to work continuously and move up and down in the pile hole.
Through adopting above-mentioned technical scheme, when high frequency impacter continued work and up-and-down motion, it can drive down-the-hole drill bit and stir the produced dregs of shrinkage cavity and outwards extrude, avoids too much dregs to block up high frequency impacter in the stake downthehole, is favorable to the continuation to carry out the breakage to the foundation pile.
The invention is further arranged that when the high-frequency impactor moves up and down difficultly, the air pressure, the air quantity and the rotating speed of the high-frequency impactor are increased until the high-frequency impactor can move up and down freely.
By adopting the technical scheme, the high-frequency impactor is difficult to move up and down, the fact that the pressure of the sludge and the dregs to the high-frequency impactor is high is proved, and when the air pressure, the air quantity and the rotating speed of the high-frequency impactor are improved, the down-the-hole drill bit can rapidly extrude the sludge and the dregs around the down-the-hole drill bit outwards, so that the pressure of the sludge and the dregs to the high-frequency impactor is reduced, and the difficulty of the up-and-down movement of the high-frequency impactor is reduced.
The invention is further arranged in the process from the fourth step to the sixth step, circulating gas with set pressure and air volume is discharged into a high-frequency impactor positioned at the bottom of the hole through a drill rod by adopting an air compressor, the high-frequency impactor is matched with the down-the-hole drill bit to crush the foundation pile, and then the gas is sprayed out from the exhaust hole of the down-the-hole drill bit at the bottom of the hole and is exhausted to the hole opening on the upper ground surface to blow slag, so that the slag soil after the foundation pile is crushed is gradually removed.
Through adopting above-mentioned technical scheme, at the in-process that the down-the-hole drill bit bored and broken foundation pile, produced dregs can be blown to the ground surface drill way of top fast, in time by circulating gas, avoided the too much difficult problem of boring that leads to of dregs.
The invention is further arranged that in the fifth step, in the process of lifting the high-frequency impactor, the air compressor keeps working and continuously supplies air until the high-frequency impactor is lifted out of the pile hole, and then the air compressor stops working.
By adopting the technical scheme, if the air compressor is closed before the high-frequency impactor is not completely separated from the pile hole, the high-frequency impactor is very difficult to be proposed under the burying of the dregs and the sludge, so the difficulty of the high-frequency impactor in the proposal is reduced by the technical scheme.
The invention further provides that the down-the-hole drill bit comprises: the drill bit comprises a drill handle and a drill bit part, a plurality of powder discharging grooves are formed in the outer edge of the drill bit part at intervals, the drill bit part is provided with a front end face, a plurality of limiting claws are fixed on the outer edge of the drill bit part and are located adjacent to each other between the powder discharging grooves, and claw tips of the limiting claws extend out of the plane where the front end face is located by 20-150 mm.
By adopting the technical scheme, when the foundation pile under the foundation is crushed, the limiting claw can firstly contact the upper end surface of the foundation pile, and when the down-the-hole drill bit rotates at a high speed, the limiting claw can sleeve the top of the foundation pile to have a good limiting effect, so that the down-the-hole drill bit can be prevented from deviating in the drilling process, and the down-the-hole drill bit is kept in a vertical state until the whole foundation pile is completely crushed, and the construction difficulty is reduced; and spacing claw and arrange the spaced apart arrangement in powder groove, spacing claw can not influence the slag charge discharge yet at the probing in-process, and structural design is more reasonable.
The invention is further provided with four groups of limiting claws, each group of limiting claws is symmetrically and uniformly arranged on the outer edge of the drill bit part at intervals, two limiting claws form one group, and the two limiting claws in the same group are arranged at intervals.
By adopting the technical scheme, the design of the plurality of groups of limiting claws ensures that when the down-the-hole drill bit rotates for a circle, more limiting claws are contacted with the foundation around the foundation pile to be crushed, thereby improving the efficiency of crushing the foundation by the limiting claws; meanwhile, due to the symmetrical design, the center of gravity of the down-the-hole drill bit can be closer to the central axis of the down-the-hole drill bit, and the down-the-hole drill bit is more stable in rotation.
The invention is further set that the drilling machine adopts a crawler-type or walking-type drilling machine pile frame, the down-the-hole drill bit adopts a hard alloy drill bit, and the air compressor adopts 1-3 large air compressors with the air displacement of 24-30 cubic meters.
By adopting the technical scheme, the crawler-type or walking-type drilling machine pile frame has the advantages of stable and safe operation and very flexible movement in a construction site; the hard alloy drill bit has the advantages of high structural strength, low possibility of abrasion, high foundation pile breaking efficiency and the like; the air displacement of the large-scale air compressor is 24-30 cubic meters, so that the down-the-hole drill can be guaranteed to be capable of drilling to the bottommost part of the foundation pile, and broken slag can be smoothly discharged.
In conclusion, the beneficial technical effects of the invention are as follows:
firstly, the foundation pile is gradually crushed directly through the high-speed rotating down-the-hole drill bit, a soil layer around the foundation pile does not need to be excavated, and various foundation pit supports do not need to be built for excavating the soil layer, so that the construction engineering amount is greatly reduced, and meanwhile, a large amount of construction cost is saved; while under the following conditions: the air volume of the high-frequency impactor is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor is 15-60 kilonewtons, the down-the-hole drill can be guaranteed to break the foundation pile smoothly and efficiently, the broken slag of the foundation pile can be smoothly discharged, the down-the-hole drill can be guaranteed to break the whole foundation pile smoothly, and the process is simple and safe;
secondly, when the foundation pile under the foundation is crushed, the limiting claw can firstly contact the upper end face of the foundation pile around the foundation pile, and when the down-the-hole drill bit rotates at a high speed, the limiting claw can sleeve the top of the foundation pile to have a good limiting effect, so that the down-the-hole drill bit can be prevented from deviating in the drilling process, and the down-the-hole drill bit is kept in a vertical state until the whole foundation pile is completely crushed, and the construction difficulty is reduced; and spacing claw and arrange the spaced apart arrangement in powder groove, spacing claw can not influence the slag charge discharge yet at the probing in-process, and structural design is more reasonable.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an embodiment of the present invention in a construction state;
FIG. 3 is a schematic representation of the construction of a down-the-hole drill bit according to an embodiment of the present invention;
fig. 4 is a sectional view taken along the plane a-a in fig. 3.
Reference numerals: 101. a drilling machine; 102. an air compressor; 103. a high-frequency impactor; 104. a down-the-hole drill bit; 105. foundation piles; 106; dewatering wells; 1. a drill shank; 11. a straight-through air passage; 2. drilling a head part; 21. a powder discharge groove; 22. a front end face; 23. an oblique air duct; 24. an air outlet; 25. an inclined hole air passage; 26. chamfering the inclined plane; 3. a limiting claw; 31. an inner bevel; 32. an outer bevel; 4. hard alloy teeth.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the invention discloses a deep crushing and dismantling construction method for an old building pile foundation, which comprises the following steps: construction preparation S1, pile position confirmation S2, drill positioning and leveling S3, high-frequency impactor pile breaking S4, drilling to the bottom elevation of a foundation pile and lifting the drill S5, and pile hole backfilling S6.
The construction preparation S1 comprises the steps of enabling a drilling machine 101, an air compressor 102, a high-frequency impactor 103 and a down-the-hole drill bit 104 to enter a construction site, firmly installing the high-frequency impactor 103 on a stand column, fixedly installing the down-the-hole drill bit 104 on the high-frequency impactor 103, enabling the air compressor 102 to be communicated with the high-frequency impactor 103, debugging the mechanical equipment and enabling the construction site to be smooth before construction.
The drilling machine 101 adopts a crawler-type or walking-type drilling machine pile frame, the down-the-hole drill bit 104 adopts a hard alloy drill bit, and the air compressor 102 adopts a large air compressor with the air displacement of 24-30 cubic meters. The crawler-type or walking-type drilling machine pile frame has the advantages of stable and safe operation and very flexible movement in a construction site; the hard alloy drill bit has the advantages of high structural strength, low possibility of abrasion, high breaking efficiency on the foundation pile 105 and the like; the air displacement of the large-scale air compressor is required to be 24-30 cubic meters, so that the down-the-hole drill bit 104 can be guaranteed to be capable of drilling to the bottommost part of the foundation pile 105, and broken slag can be smoothly discharged.
Pile position confirmation S2: and determining the position of the foundation pile 105 and marking according to the engineering drawing of the old building pile foundation.
High-frequency impactor pile breaking S4: after 1-3 air compressors 102 are started, a drilling machine 101 is started, the air volume of a high-frequency impactor 103 is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor 103 is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor 103 is 15-60 kilonewtons, and a down-the-hole drill 104 gradually crushes a foundation pile 105 in the downward drilling process.
In step S4, in the downward process of the down-the-hole drill 104, the verticality of the drill stem of the high-frequency impactor 103 is maintained and the hole-forming deflection rate is not greater than 1%, and when the verticality of the drill stem is relatively correct, the down-the-hole drill 104 and the foundation pile 105 are not easy to deflect or skew, and when the length of the foundation pile 105 is relatively long, the down-the-hole drill 104 can be ensured to completely break the whole foundation pile 105, thereby avoiding the problem of incomplete breaking of the foundation pile 105 caused by halfway skew of the down-the-hole drill 104.
In step S4, when a hole shrinkage phenomenon occurs in the pile hole, the high-frequency impactor 103 is kept to continuously work and move up and down in the pile hole, and when the high-frequency impactor 103 continuously works and moves up and down, the high-frequency impactor can drive the down-the-hole drill bit 104 to stir and extrude muck generated in the hole shrinkage, so that the high-frequency impactor 103 is prevented from being blocked in the pile hole by excessive muck, and the base pile 105 is broken continuously; when the high-frequency impactor 103 is difficult to move up and down, the air pressure, the air volume and the rotating speed of the high-frequency impactor 103 are increased until the high-frequency impactor 103 can freely move up and down, and the up-and-down movement of the high-frequency impactor 103 is difficult, so that the pressure of the sludge and the muck on the high-frequency impactor 103 is proved to be large, and when the air pressure, the air volume and the rotating speed of the high-frequency impactor 103 are increased, the down-the-hole drill bit 104 can rapidly extrude the sludge and the muck around the high-frequency impactor to the outside, so that the pressure of the sludge and the muck on the high-frequency impactor 103 is reduced, and the.
In step S4, if the powder-blasting pile body section with soft and hard interbedded layer is encountered, the pile can be broken by drilling the down-the-hole drill 104 at a low speed, slowly drilling, and reducing pressure, and when the down-the-hole drill 104 just contacts the foundation pile 105, the rotation speed of the down-the-hole drill 104 can be properly reduced, and when the down-the-hole drill 104 is stable, the speed can be properly increased gradually. When replacing the down-the-hole drill bit 104, it is ensured that the replacement drill bit has a smaller diameter than the replaced drill bit, in case the replacement drill bit gets stuck in the pile hole.
Drilling to the bottom elevation of the foundation pile to improve the drilling S5: after the down-the-hole drill 104 is drilled to the bottom elevation of the foundation pile 105, the high-frequency impactor 103 and the down-the-hole drill 104 are gradually lifted.
In step S5, during the process of lifting the high-frequency impactor 103, the air compressor 102 keeps working and continues supplying air until the air compressor 102 stops working after the high-frequency impactor 103 is lifted out of the pile hole, and if the air compressor 102 is turned off before the high-frequency impactor 103 is not completely separated from the pile hole, the high-frequency impactor 103 is very difficult to lift out under the burying of the dregs and the silt, so the technical scheme reduces the difficulty of lifting out the high-frequency impactor 103.
Pile hole backfilling S6: after the down-the-hole drill bit 104 is completely removed from the pile hole, backfill soil is poured into the pile hole.
Add a plurality of precipitation wells 106 according to the geological conditions of construction site, draw water in succession through precipitation well 106 during the construction and in order to reduce the water level pressure in the construction site, when being under construction on the great ground of some soil property water content, abolish the in-process of foundation pile 105, underground water and silt that will be continuous later flow to the stake hole, in case underground water and silt are too much, cause the phenomenon such as shrinkage cavity or collapse easily, it is safe inadequately, through setting up precipitation well 106, can effective control water content, both convenient construction, it is also safer.
In the process from step S4 to step S6, circulating gas with set pressure and air volume is discharged into a high-frequency impactor 103 at the bottom of the hole through a drill pipe by using an air compressor 102, and the high-frequency impactor 103 cooperates with a down-the-hole drill 104 to crush the foundation pile 105; and then, the gas is sprayed out from the exhaust hole of the down-the-hole drill bit 104 at the bottom of the hole and exhausts and blows slag to the hole opening of the upper ground surface, so that the crushed slag soil of the foundation pile 105 is gradually removed, and the generated slag soil can be quickly and timely blown to the hole opening of the upper ground surface by the circulating gas in the process of drilling down and crushing the foundation pile 105 by the down-the-hole drill bit 104, so that the problem of difficult drilling down caused by excessive slag soil is avoided.
The implementation principle of the embodiment is as follows: the foundation pile 105 is gradually crushed directly through the high-speed rotating down-the-hole drill bit 104, a soil layer around the foundation pile 105 does not need to be excavated, and various foundation pit supports do not need to be built for excavating the soil layer, so that the construction engineering amount is greatly reduced, and meanwhile, a large amount of construction cost is saved, and as the speed of the down-the-hole drill bit 104 for crushing the foundation pile 105 is far higher than the speed of manually crushing the foundation pile 105 in an exposed state, the construction period of crushing and dismantling the whole pile foundation is also obviously shortened, and the high-speed down-the-hole drill bit has strong practicability and application prospect; while under the following conditions: the air volume of the high-frequency impactor 103 is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor 103 is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor 103 is 15-60 kilonewtons, the down-the-hole drill 104 can be guaranteed to break the foundation pile 105 smoothly and efficiently, the slag after the foundation pile 105 is broken can be discharged smoothly, the whole foundation pile 105 can be broken smoothly by the down-the-hole drill 104, and the process is simple and safe.
Referring to fig. 3 and 4, the down-the-hole drill bit 104 includes: the drill comprises a drill handle 1 and a drill bit 2, wherein a plurality of powder discharge grooves 21 are formed in the outer edge of the drill bit 2 at intervals, the drill bit 2 is provided with a front end face 22, a plurality of limiting claws 3 are fixed on the outer edge of the drill bit 2, the limiting claws 3 are located between the adjacent powder discharge grooves 21, and claw tips of the limiting claws 3 extend out of a plane where the front end face 22 is located by 50mm (in other embodiments, the plane can also extend out by 20mm, 30mm, 40mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm and 150 mm).
The stopping claw 3 is made of cemented carbide and welded to the drill head 2, the stopping claw 3 is designed to be perpendicular to the front end face 22, in other embodiments, the stopping claw 3 may be designed to be inclined appropriately, which mainly ensures that the stopping claw 3 is substantially perpendicular to the front end face 22, and generally, the diameter of the down-the-hole drill bit 104 is close to or directly consistent with the diameter of the foundation pile 105 to be crushed. The diameter of the limiting claws 3 is between 10mm and 100mm, the length of the limiting claws 3 is between 20mm and 500mm, the number of the limiting claws 3 is approximately between 3 and 30, the number of the limiting claws 3 is increased along with the increase of the diameter of the down-the-hole drill bit 104, and the diameter and the length of the limiting claws 3 are increased along with the increase of the diameter of the down-the-hole drill bit 104.
When the foundation pile 105 under the foundation is crushed, the limiting claw 3 can firstly contact the upper end surface of the foundation around the foundation pile 105 (refer to fig. 2 specifically), and when the down-the-hole drill bit 104 rotates at a high speed, the limiting claw 3 can sleeve the top of the foundation pile 105 to have a good limiting effect, so that the down-the-hole drill bit 104 can be prevented from deviating in the drilling process, and the vertical state is kept until the whole foundation pile 105 is completely crushed, so that the construction difficulty is reduced; and spacing claw 3 and arrange powder groove 21 spaced apart arrangement, spacing claw 3 can not influence the slag charge and discharge in the probing process yet, and structural design is more reasonable.
The drill bit part 2 is provided with the chamfer inclined surface 26, the chamfer inclined surface 26 and the front end surface 22 are both provided with the hard alloy teeth 4, the arrangement range of the hard alloy teeth 4 is larger, and further, the contact points of the hard alloy teeth 4 and the foundation pile 105 are more, so that the breaking efficiency of the foundation pile 105 is higher when the down-the-hole drill bit 104 rotates.
The arrangement density of the hard alloy teeth 4 on the chamfer inclined surface 26 is greater than that of the hard alloy teeth 4 on the front end surface 22, and the hard alloy teeth 4 on the chamfer inclined surface 26 bear larger cutting amount and reduce the abrasion loss at the same time, so that the abrasion degrees of the hard alloy teeth 4 on the chamfer inclined surface 26 and the front end surface 22 at different speeds are different, and the problem that the service life of a drill bit is reduced due to local excessive abrasion is solved.
The cemented carbide teeth 4 are arranged on the chamfer inclined surface 26 and the front end surface 22 at intervals in a non-equidistant manner, and the cemented carbide teeth 4 arranged at non-equidistant manner generate vibration waves with different amplitudes during rotation, so that the drilling and crushing efficiency of the down-the-hole drill bit 104 is improved, and the slag obtained by crushing is easy to discharge, thereby improving the drilling efficiency and the service life of the down-the-hole drill bit 104.
The limiting claws 3 are provided with a plurality of groups, each group of limiting claws 3 are symmetrically and uniformly arranged at intervals on the outer edge of the drill bit part 2, two limiting claws 3 form a group, and the two limiting claws 3 in the same group are arranged at intervals. The design of the plurality of groups of limiting claws 3 improves the efficiency of the limiting claws 3 in crushing the foundation by contacting more limiting claws 3 with the foundation around the foundation pile 105 to be crushed when the down-the-hole drill bit 104 rotates for one circle; meanwhile, the symmetrical design can enable the center of gravity of the down-the-hole drill bit 104 to be closer to the central axis of the down-the-hole drill bit, and the down-the-hole drill bit 104 is more stable when rotating.
The limiting claws 3 are specifically provided with four groups, and in other embodiments, the limiting claws 3 can be symmetrically provided with three groups or five groups or more. The number of the limiting claws 3 cannot be too much, the manufacturing cost and difficulty of the claw type down-the-hole drill bit 104 are effectively controlled, the number of the limiting claws 3 cannot be too small, and the drilling and crushing efficiency is effectively improved, so that the design of three groups or four groups of limiting claws 3 is more reasonable.
A through air passage 11 is arranged in the drill handle 1, a plurality of inclined air passages 23 are arranged in the drill bit part 2, the through air passage 11 is communicated with the inclined air passages 23, and air outlets 24 of the inclined air passages 23 are all arranged on the front end surface 22. During the drilling process, the down-the-hole drill bit 104 can crush the foundation pile 105 into slag, high-pressure gas can be introduced along the straight gas passage 11 and the inclined gas passage 23, and the slag can be blown outwards after the high-pressure gas is sprayed out from the gas outlet 24, so that the down-the-hole drill bit 104 is ensured not to be in direct contact with the surface of the foundation pile 105, and the crushing efficiency is higher.
The drill bit part 2 is further provided with inclined hole air passages 25, the number of the powder discharge grooves 21, the number of the inclined hole air passages 25 and the number of the air outlets 24 are consistent (four, and the inclined hole air passages 25 and the air outlets 24 are uniformly and symmetrically arranged on the drill bit part 2), the diameter of the corresponding through air passage 11 is four times that of the inclined air passage 23, and the inclined hole air passages 25 are communicated between the corresponding powder discharge grooves 21 and the air outlets 24. Due to the design of the inclined hole air passage 25, the air outlet 24 and the powder discharge groove 21 can be communicated, and then slag materials after the foundation pile 105 is crushed can be quickly separated from the rotating range of the down-the-hole drill bit 104 along the inclined hole air passage 25 and the powder discharge groove 21, so that the crushing efficiency is higher.
The claw tips of the limiting claws 3 are provided with inner inclined surfaces 31 and outer inclined surfaces 32, are wedge-shaped and have stronger drilling capacity, and holes can be formed at the moment when the down-the-hole drill bit 104 is in contact with the upper surface of the foundation around the foundation pile 105 (the down-the-hole drill bit 104 can impact downwards), so that the down-the-hole drill bit 104 is not easy to slip on the upper surface of the foundation pile 105, and the drilling and crushing efficiency is further improved.
The included angle between the inner inclined plane 31 and the front end face 22 is larger than the included angle between the outer inclined plane 32 and the front end face 22, and the inclined angle of the inner inclined plane 31 of the limiting claw 3 is larger, so that the wedge-shaped claw tip can be ensured to have good sharpness, and the primary drilling capability and the foundation crushing capability are stronger; the part close to the outside will be made of more material and will therefore be more wear-resistant, and the outside part of the holding claw 3 will be more wear-resistant and will last longer during rotation of the down-the-hole drill bit 104.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A construction method for deep crushing and dismantling of an old building pile foundation is characterized by comprising the following steps:
step one, construction preparation: the method comprises the following steps that a drilling machine (101), an air compressor (102), a high-frequency impactor (103) and a down-the-hole drill bit (104) enter a construction site, the high-frequency impactor (103) is stably installed on an upright post, the down-the-hole drill bit (104) is fixedly installed on the high-frequency impactor (103), the air compressor (102) is communicated with the high-frequency impactor (103), the mechanical equipment is debugged, and the construction site is leveled before construction;
step two, pile position confirmation: determining the position of a foundation pile (105) according to an engineering drawing of an old building pile foundation and marking the position;
thirdly, positioning and leveling the drilling machine: before drilling, the drilling machine (101) is horizontally arranged, the upright post of the drilling machine (101) is vertical to the ground, and the drill bit is aligned with the foundation pile (105);
fourthly, pile breaking by the high-frequency impactor: starting a drilling machine (101) after 1-3 air compressors (102) are started, wherein the air volume of a high-frequency impactor (103) is 24-30 cubic meters per minute, the rotating speed of the high-frequency impactor (103) is 8-25 revolutions per minute, the axial thrust of the high-frequency impactor (103) is 15-60 kilonewtons, and a down-the-hole drill bit (104) gradually crushes a foundation pile (105) in the downward drilling process;
fifthly, drilling to the bottom elevation of the foundation pile to improve drilling: after the down-the-hole drill bit (104) drills to the bottom elevation of the foundation pile (105), the high-frequency impactor (103) and the down-the-hole drill bit (104) are slowly lifted;
step six, pile hole backfilling: after the down-the-hole drill bit (104) is completely withdrawn from the pile hole, backfill soil is poured into the pile hole.
2. The deep crushing and dismantling construction method of old building pile foundation according to claim 1, characterized in that a plurality of dewatering wells (106) are added according to the geological condition of the construction site, and water level pressure in the construction site is reduced by continuously pumping water through the dewatering wells (106) during construction.
3. The deep crushing and dismantling construction method for old building pile foundations according to claim 1, characterized in that in step four, the verticality of the drill rod of the high-frequency impactor (103) is maintained and the hole-forming deflection rate is ensured to be not more than 1% during the downward process of the down-the-hole drill bit (104).
4. The deep crushing and dismantling construction method for old building pile foundation according to claim 1, characterized in that in step four, when the shrinkage cavity phenomenon occurs in the pile hole, the high frequency impactor (103) is kept working continuously and moves up and down in the pile hole.
5. The deep crushing and dismantling construction method for the old building pile foundation according to the claim 4, characterized in that when the high frequency impactor (103) has difficulty in moving up and down, the air pressure, air quantity and rotation speed of the high frequency impactor (103) are raised until the high frequency impactor (103) can freely move up and down.
6. The deep crushing and dismantling construction method for the old building pile foundation according to the claim 1 is characterized in that in the process of the fourth step to the sixth step, circulating gas with set pressure and air volume is discharged into a high-frequency impactor (103) at the bottom of a hole through a drill rod by an air compressor (102), the high-frequency impactor (103) is matched with a down-the-hole drill bit (104) to crush the foundation pile (105), and then the gas is sprayed from an exhaust hole of the down-the-hole drill bit (104) to exhaust and blow slag to an upper ground surface hole, so that the broken slag of the foundation pile (105) is gradually removed.
7. The deep crushing and dismantling construction method for old building pile foundations according to claim 1, characterized in that in step five, during the process of lifting the high-frequency impactor (103), the air compressor (102) keeps working and continuously supplies air until the air compressor (102) stops working after the high-frequency impactor (103) is lifted out of the pile hole.
8. The deep demolition construction method of an old building pile foundation according to claim 1, wherein the down-the-hole drill (104) includes: drill handle (1) and drill bit portion (2), the interval is provided with a plurality of powder discharge grooves (21) on the outer fringe of drill bit portion (2), drill bit portion (2) are provided with preceding terminal surface (22), be fixed with a plurality of spacing claws (3) on the outer fringe of drill bit portion (2), spacing claw (3) are located adjacently arrange between powder groove (21), the claw point of spacing claw (3) stretches out preceding terminal surface (22) plane 20 ~ 150mm that locates.
9. The deep crushing and dismantling construction method for the old building pile foundation according to claim 8, characterized in that four sets of the limiting claws (3) are provided, each set of the limiting claws (3) is symmetrically and uniformly arranged on the outer edge of the drill bit part (2) at intervals, two limiting claws (3) form one set, and two limiting claws (3) in the same set are arranged at intervals.
10. The deep crushing and dismantling construction method for the old building pile foundation according to claim 1, characterized in that a crawler-type or walking-type drilling machine pile frame is selected as the drilling machine (101), a hard alloy drilling bit is selected as the down-the-hole drilling bit (104), and 1-3 large air compressors with the air displacement of 24-30 cubic meters are selected as the air compressors (102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193345.2A CN110952916A (en) | 2019-11-28 | 2019-11-28 | Construction method for crushing and dismantling deep part of old building pile foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193345.2A CN110952916A (en) | 2019-11-28 | 2019-11-28 | Construction method for crushing and dismantling deep part of old building pile foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110952916A true CN110952916A (en) | 2020-04-03 |
Family
ID=69978801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911193345.2A Pending CN110952916A (en) | 2019-11-28 | 2019-11-28 | Construction method for crushing and dismantling deep part of old building pile foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110952916A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065095A (en) * | 2020-09-11 | 2020-12-11 | 中国水利水电第十二工程局有限公司 | Reinforced concrete support beam dismantling device and using method thereof |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5374704A (en) * | 1976-12-15 | 1978-07-03 | Mitsubishi Heavy Ind Ltd | Concrete pile crusher |
| CN2806566Y (en) * | 2005-06-21 | 2006-08-16 | 上海建仕建筑工程有限公司 | Pile extracting device using steel sleeve water-gas injection method |
| CN202431200U (en) * | 2012-01-17 | 2012-09-12 | 李保顺 | Symmetrical type down-the-hole drill bit |
| CN103277037A (en) * | 2013-07-02 | 2013-09-04 | 二十二冶集团天津建设有限公司 | Pipe pile leading-hole construction method under boulder cluster geological condition |
| CN203584301U (en) * | 2013-10-09 | 2014-05-07 | 深圳市晟辉机械有限公司 | Hole guide equipment |
| CN103835292A (en) * | 2013-12-17 | 2014-06-04 | 建基建设集团有限公司 | High-frequency vibration-punching base expansion grouting pipe pile and construction method thereof |
| CN104060615A (en) * | 2014-06-05 | 2014-09-24 | 江苏省华建建设股份有限公司 | Construction method utilizing newly-built supporting structure of foundation pit to eliminate underground obstacle |
| CN104675325A (en) * | 2015-02-10 | 2015-06-03 | 陶德明 | Full-hydraulic down-hole rotating impact combined drill bit for piling rock and soil layer |
| CN105672348A (en) * | 2016-01-27 | 2016-06-15 | 重庆大学 | Construction method for cropping bridge pile foundation at sandy gravel stratum of abyssal region |
| CN205444192U (en) * | 2015-10-29 | 2016-08-10 | 中铁十六局集团北京轨道交通工程建设有限公司 | Bridge stake is towards pile driving construction system |
| CN205576916U (en) * | 2016-03-14 | 2016-09-14 | 大成科创基础建设股份有限公司 | A drilling equipment for secret pile foundation is demolishd |
| CN205778555U (en) * | 2016-05-19 | 2016-12-07 | 宣化苏普曼钻潜机械有限公司 | A kind of down-the-hold drill bit |
| CN205778544U (en) * | 2016-05-19 | 2016-12-07 | 宣化苏普曼钻潜机械有限公司 | A kind of anti-sticking down-the-hold drill bit |
| CN107938656A (en) * | 2017-10-20 | 2018-04-20 | 广州中煤江南基础工程公司 | Complexity rebuilds base pit engineering pile base construction method |
| CN207296885U (en) * | 2017-09-12 | 2018-05-01 | 李隽� | High-efficient impacting drill bit is used in the construction of pile foundation impact holing |
| CN108729445A (en) * | 2018-08-13 | 2018-11-02 | 中地君豪建筑工程有限公司 | The method for abolishing the drill bit of waste and old solid pile and abolishing old solid pile and new pile being perfused |
-
2019
- 2019-11-28 CN CN201911193345.2A patent/CN110952916A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5374704A (en) * | 1976-12-15 | 1978-07-03 | Mitsubishi Heavy Ind Ltd | Concrete pile crusher |
| CN2806566Y (en) * | 2005-06-21 | 2006-08-16 | 上海建仕建筑工程有限公司 | Pile extracting device using steel sleeve water-gas injection method |
| CN202431200U (en) * | 2012-01-17 | 2012-09-12 | 李保顺 | Symmetrical type down-the-hole drill bit |
| CN103277037A (en) * | 2013-07-02 | 2013-09-04 | 二十二冶集团天津建设有限公司 | Pipe pile leading-hole construction method under boulder cluster geological condition |
| CN203584301U (en) * | 2013-10-09 | 2014-05-07 | 深圳市晟辉机械有限公司 | Hole guide equipment |
| CN103835292A (en) * | 2013-12-17 | 2014-06-04 | 建基建设集团有限公司 | High-frequency vibration-punching base expansion grouting pipe pile and construction method thereof |
| CN104060615A (en) * | 2014-06-05 | 2014-09-24 | 江苏省华建建设股份有限公司 | Construction method utilizing newly-built supporting structure of foundation pit to eliminate underground obstacle |
| CN104675325A (en) * | 2015-02-10 | 2015-06-03 | 陶德明 | Full-hydraulic down-hole rotating impact combined drill bit for piling rock and soil layer |
| CN205444192U (en) * | 2015-10-29 | 2016-08-10 | 中铁十六局集团北京轨道交通工程建设有限公司 | Bridge stake is towards pile driving construction system |
| CN105672348A (en) * | 2016-01-27 | 2016-06-15 | 重庆大学 | Construction method for cropping bridge pile foundation at sandy gravel stratum of abyssal region |
| CN205576916U (en) * | 2016-03-14 | 2016-09-14 | 大成科创基础建设股份有限公司 | A drilling equipment for secret pile foundation is demolishd |
| CN205778555U (en) * | 2016-05-19 | 2016-12-07 | 宣化苏普曼钻潜机械有限公司 | A kind of down-the-hold drill bit |
| CN205778544U (en) * | 2016-05-19 | 2016-12-07 | 宣化苏普曼钻潜机械有限公司 | A kind of anti-sticking down-the-hold drill bit |
| CN207296885U (en) * | 2017-09-12 | 2018-05-01 | 李隽� | High-efficient impacting drill bit is used in the construction of pile foundation impact holing |
| CN107938656A (en) * | 2017-10-20 | 2018-04-20 | 广州中煤江南基础工程公司 | Complexity rebuilds base pit engineering pile base construction method |
| CN108729445A (en) * | 2018-08-13 | 2018-11-02 | 中地君豪建筑工程有限公司 | The method for abolishing the drill bit of waste and old solid pile and abolishing old solid pile and new pile being perfused |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065095A (en) * | 2020-09-11 | 2020-12-11 | 中国水利水电第十二工程局有限公司 | Reinforced concrete support beam dismantling device and using method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111335306A (en) | Rapid construction method for deep and thick hard rock section drilled pile | |
| CN213775271U (en) | Barrel drill | |
| CN113550305B (en) | Construction method and drill bit for high-pressure water jet stiffening core composite pile of hard soil interlayer foundation | |
| US5823276A (en) | Diamond-tipped core barrel and method of using same | |
| JP5049913B2 (en) | Drilling machine | |
| CN110952916A (en) | Construction method for crushing and dismantling deep part of old building pile foundation | |
| CN213233469U (en) | Triaxial down-the-hole impact high-pressure jet grouting equipment | |
| CN111058767B (en) | Construction method of rock-socketed cast-in-situ bored pile | |
| CN112901074A (en) | Rock-socketed drilling pore-forming process of marine large-diameter inclined pile rotary excavator | |
| CN112983258A (en) | Down-the-hole hammer rapid hole forming construction method for unconsolidated rock stratum geology | |
| CN113969581A (en) | Construction method for rock-entering pile planting | |
| CN214033711U (en) | Rotary drilling bit for removing waste pile | |
| CN213234956U (en) | Be applied to drilling tool and stake machine of stake machine | |
| CN211647984U (en) | Device for improving rock-entering efficiency of rotary drilling rig | |
| CN100485132C (en) | Formative method for row-pile style water-proof wall underground | |
| CN210163888U (en) | Quick construction structure of major diameter socketed pile | |
| CN207033350U (en) | A kind of composite multi-functional ground spiral drill | |
| CN111945731A (en) | Single steel bar rotary core drilling machine for shield interval limit-invading pile foundation and processing construction method | |
| CN110805307A (en) | Underground continuous wall removing method | |
| CN216767268U (en) | Combined drill bit | |
| CN114622559B (en) | Construction method for controlling perpendicularity of ultra-large diameter rock-socketed rotary digging pile | |
| CN213296352U (en) | Hydraulic drill bit for efficient sleeve pile pulling | |
| CN213898856U (en) | Integrated reverse circulation drill bit | |
| CN219176266U (en) | Cage type drill bit and diving drilling machine | |
| CN112343510B (en) | Construction method for crushing rock and coring by using plasma pulse |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xu Jing Inventor after: Jiang Li Inventor after: Wu Yuegang Inventor after: Wu Hanping Inventor after: Wu Di Inventor after: Yang Lei Inventor after: Wu Bingqian Inventor before: Wu Yuegang Inventor before: Jiang Li Inventor before: Xu Jing Inventor before: Wu Hanping Inventor before: Wu Di Inventor before: Yang Lei Inventor before: Wu Bingqian |
|
| CB03 | Change of inventor or designer information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200403 |
|
| RJ01 | Rejection of invention patent application after publication |