CN117231131A - Micro-hole cast-in-place pile drilling equipment and rapid drilling construction method - Google Patents

Abstract

The application provides micro-hole bored pile drilling equipment and a rapid drilling construction method, and relates to the field of bored pile construction. The drill rod comprises a drill rod, a sheath and a drill bit, wherein the sheath is sleeved on the outer side of the drill rod and is connected with the drill rod through a connecting rod, and the drill bit is arranged at the bottom of the drill rod; the drill rod is of a tubular structure, the crushing rod is sleeved in the drill rod, the hoisting end of the crushing rod is connected with the crane, the broken stone end of the crushing rod is close to the drill bit and is in a pointed cone shape, the broken stone end of the crushing rod is provided with a containing groove, and the broken stone end of the crushing rod penetrates through the drill bit through the containing groove and breaks up the obstacle. The drill bit is adapted to and movably penetrates through the accommodating groove, and the height of the drill bit is smaller than the depth of the accommodating groove. The application has the characteristics of breaking the obstruction in the stratum and improving the drill bit footage speed and the pore-forming efficiency.

Description

Micro-hole cast-in-place pile drilling equipment and rapid drilling construction method

Technical Field

The application relates to the field of bored pile construction, in particular to a micro-hole bored pile drilling device and a micro-hole bored pile rapid drilling construction method.

Background

The concrete filling pile is a structure which is frequently used in civil construction and infrastructure and used for improving the bearing capacity of the foundation, and is widely applied to high-rise buildings, bridges and some areas with poor land tolerance. The micro-pore-forming bored concrete pile is a bored concrete pile with smaller diameter, the diameter is generally 10-40 cm, the slenderness ratio is generally more than 30, and the pile body consists of cement mortar poured by pressure or small stone concrete and stiffening materials.

At present, the work progress of bored concrete pile mainly includes drilling, settling steel reinforcement cage and pouring concrete, wherein the drilling is the key link, adopts the carousel formula rig to drive the drill bit in the current work progress generally, and the drill bit is in the hole after passing different stratum, in the chinese patent document of publication No. CN214576767U, has disclosed bored concrete pile machine drill bit and bored concrete pile, and specifically discloses drilling subassembly including the drilling rod, fixed cover establish the drilling rod near-end waistband at and fixed connection in the drill point of drilling rod, has solved the work progress and can't guarantee the drilling aperture well, thereby has led to the technical problem of necking down under the bad texture condition.

But in the process of drilling the gravel stratum, the drill bit is difficult to break the gravel, so that the footage is slower, the pore-forming efficiency is low, the construction production requirement cannot be met, and if more advanced mechanical equipment is temporarily rented, the construction cost is increased.

Disclosure of Invention

In order to solve the problem of slow footage and low hole forming efficiency caused by hard substances contained in a stratum, the application provides micro-hole cast-in-place pile drilling equipment and a rapid drilling construction method.

In a first aspect, the application provides a micro-hole cast-in-place pile drilling device, which adopts the following technical scheme:

the micro-hole bored pile drilling equipment comprises a drill rod, a sheath and a drill bit, wherein the sheath is sleeved on the outer side of the drill rod and is connected with the drill rod through a connecting rod, and the drill bit is arranged at the bottom of the drill rod;

the drill rod is of a tubular structure, the crushing rod is sleeved in the drill rod, the lifting end of the crushing rod drives the crushing rod to slide up and down in the drill rod, the broken stone end of the crushing rod is close to the drill bit and is in a pointed cone shape, the broken stone end of the crushing rod is provided with a containing groove, and the broken stone end of the crushing rod penetrates through the drill bit through the containing groove and breaks up an obstacle.

By adopting the technical scheme, the drilling machine drives the drill rod and the drill bit to rotate, so that a borehole is formed at the calibrated position, the outer wall of the sheath is attached to the inner wall of the borehole, and the protection wall of the borehole can be formed in the process of drilling by the drill bit to prevent the borehole from collapsing; further, when the drill hole encounters an obstacle such as gravel, the drill bit stops rotating, the crushing rod is hung on the inner side of the drill rod, then the crushing rod is released, and under the action of gravity, the crushing rod can be accelerated to fall and strike the obstacle, so that the obstacle is crushed, the footage speed of the drill hole is improved, and the improvement of the hole forming efficiency can be promoted; the drill rod is hollow tubular, the drill bit is arranged at the bottom of the drill rod and interferes with the axis of the drill rod, and therefore, in the process that the broken stone end of the broken rod falls down, the accommodating groove of the broken stone end of the broken rod can be sleeved into the drill bit, so that the end face of the broken stone end of the broken rod can protrude to the lower side of the bottom end face of the drill bit, and further the broken stone end of the broken rod can form impact and breaking actions on a barrier.

Optionally, the drill bit is adapted to be movably inserted into the accommodating groove, and the height of the drill bit is smaller than the depth of the accommodating groove.

Through adopting above-mentioned technical scheme, the broken pole is falling downwards, when being close to the barrier, and the drill bit can enter into the accommodation groove, and the terminal surface of broken stone end of broken pole can continue to move down to the terminal surface below of drill bit, and then realize the impact and the crushing effect to the barrier, that is to say, through the setting of accommodation groove, can ensure that the broken pole is when falling behind and the drill bit produces the interference, and the terminal surface of broken stone end of broken pole has been located the terminal surface below of drill bit, just also can form the crushing effect to the barrier.

Optionally, the length of the crushing rod is greater than the length of the drill rod.

By adopting the technical scheme, the initial falling height of the crushing rod can be increased as much as possible, and then the impact force of the crushing rod on the obstacle is increased.

Optionally, be equipped with two at least location groups on the outer wall of drilling rod, the location group includes a plurality of locating levers, the locating lever passes through the locating hole and establishes on the drilling rod, a plurality of the locating lever is followed the outer circumference interval arrangement of drilling rod, a plurality of the locating lever is located the one end centre gripping of drilling rod the outer wall of broken pole.

Through adopting above-mentioned technical scheme, broken pole is by at least one locating group centre gripping, and a locating group includes a plurality of locating levers, be equipped with the locating hole with a plurality of locating levers one-to-one on the outer wall of drilling rod, the one end of locating lever is located the outside of drilling rod, the other end of locating lever extends to the inboard of drilling rod, the other end of a plurality of locating levers stretches into in the drilling rod after forming the centre gripping effect to broken pole, like this, in the in-process that broken pole falls, can be held by a plurality of locating levers centre gripping of a plurality of locating groups all the time, just so ensure that broken pole can drop under keeping coaxial state with the drilling rod, and then ensure that the drill bit can align and enter into the holding tank with the holding tank, finally realize broken stone end and the obstacle contact of broken pole and break the obstacle.

Optionally, the plurality of positioning holes in the same positioning group are in the same horizontal plane.

Through adopting above-mentioned technical scheme, a plurality of locating levers that are in the coplanar can form more reliable centre gripping, location and spacing effect to the broken pole, ensure that the broken pole can be followed the vertical whereabouts of axis direction of drilling rod.

Optionally, the locating lever with be clearance fit between the locating hole, the one end that the locating lever is located the drilling rod is the sphere form, the other end of locating lever is equipped with the arc clamp plate, still be equipped with a plurality of air cushions on the outer wall of drilling rod, the air cushion is located the arc clamp plate with between the drilling rod, the air supply control expansion and shrink of air cushion drive the locating lever stretches into or extracts the drilling rod.

Through adopting above-mentioned technical scheme, the locating lever is located the one end of drilling rod and is the sphere form, can reduce the area of contact with broken pole, ensures that broken pole can more smoothly penetrate between a plurality of locating levers of next location group by between a plurality of locating levers of location group.

Further, after the drill bit length reaches 40-60cm, the drill bit rotates at the lowest rotating speed, then the air source supplies air to the air cushions in the well hole through the air pipes, so that the air cushions are in an expanded state, and further the arc pressing plates are attached to the inner wall of the well hole.

When the drill bit encounters a barrier and cannot enter into the drill rod, the drill bit stops rotating, the air source pumps out the air in the expanded air cushion which is positioned in the well hole, the arc-shaped pressing plate is driven to move towards the direction of the drill rod in the process of reducing the volume of the air cushion, the positioning rods can extend into the drill rod, after the positioning rods in the same positioning group are displaced in place, formed channels among the positioning rods can be used for allowing the crushing rods to pass through, and after the crushing rods penetrate into the channels, the positioning rods can reliably support and position the crushing rods, so that the crushing rods can fall down rapidly along the axial direction of the drill rod, and impact and crushing to the barrier are formed.

Optionally, an air cushion is arranged between two adjacent arc-shaped pressing plates, and two air cushions are pressed against two sides of the same arc-shaped pressing plate;

the inner wall of air cushion with the outer wall fixed connection of drilling rod, the outer wall both sides of air cushion are equipped with the slider, the arc clamp plate is towards one side of air cushion is equipped with the draw-in groove, the slider is in with the adaptation draw-in groove is internal to slide.

By adopting the technical scheme, one arc-shaped pressing plate can reciprocate along the axial direction of the positioning hole under the drive of the two air cushions, when the arc-shaped pressing plate is attached to the inner wall of the well hole, the wall protection effect can be achieved, and when the arc-shaped pressing plate is close to the drill rod, the effect of supporting and positioning the crushing rod can be achieved;

in the process of assembling the arc-shaped pressing plate and the air cushion, the sliding blocks on the air cushion slide into the clamping grooves of the arc-shaped pressing plate, connection between the air cushion and the arc-shaped pressing plate can be achieved, the air cushion can be ensured to be attached to the inner wall of a borehole in the expanding process, and the arc-shaped pressing plate can be pulled to be close to a drill rod in the air cushion shrinking process.

Optionally, two sliding blocks are arranged on the arc-shaped pressing plate, and the two sliding blocks are respectively positioned on two sides of the arc-shaped pressing plate and respectively arranged in two clamping grooves of the two air cushions.

Through adopting above-mentioned technical scheme, the connection between arc clamp plate and the air cushion is stable and more balanced, has guaranteed after two air cushions of supporting same arc clamp plate expand, and the axis direction that the arc clamp plate can follow the locating lever removes, can not take place to deflect.

Optionally, a threaded rod and a pair of locking rods are fixedly arranged in the middle of one side of the arc-shaped pressing plate, which faces the air cushion, a threaded hole and a pair of arc-shaped grooves are formed in the end face of one side, which is in contact with the arc-shaped pressing plate, of the positioning rod, and the threaded rod is adaptively screwed in the threaded hole;

the pair of locking rods are respectively inserted into the pair of arc-shaped grooves in a one-to-one correspondence manner and rotate in the arc-shaped grooves.

Through adopting above-mentioned technical scheme, the threaded rod has realized arc clamp plate and locating lever detachable connection behind screw in screw hole, after the screw in screw hole depth of threaded rod, a pair of locking lever on the arc clamp plate can insert a pair of arc inslot correspondingly, and the width of arc inslot reduces gradually along the direction of rotation of locking lever, like this, after the threaded rod screw in screw hole completely, the locking lever rotates to the narrowest position of arc inslot width, thereby realize interference fit between locking lever and the arc inslot, realize the locking function after the locking lever is connected arc clamp plate and locating lever promptly, prevent to produce the deflection between arc clamp plate and the reference column at drilling rod pivoted in-process, under the cooperation with slider and draw-in groove, effectively improve the fixed action to the arc clamp plate.

In a second aspect, the application provides a rapid drilling construction method for a micro-hole cast-in-place pile, which adopts the following technical scheme:

the quick drilling construction method of the micro-hole cast-in-place pile comprises the following steps:

s1, selecting a drilling position, placing a drill rod with a drill bit at the position, and driving the drill rod to rotate through a drilling machine;

s2, after the drill rod completely enters the well hole and each time the drill rod enters the well hole for 40-60cm, the drilling machine drives the drill rod and the drill bit to rotate with the lowest power, meanwhile, the air source supplies air to the air cushion, and the air cushion is inflated to push the arc-shaped pressing plate to compact the inner wall of the well hole;

s3, after the air cushion is maintained for 2-5min, the air source is used for exhausting air from the air cushion, after the arc-shaped pressing plate is attached to the drill rod, the drill stops rotating, and the crushing rod is inserted into the drill rod and is enabled to fall freely;

s4, the crushing rod reciprocates in the vertical direction and impacts the obstacle, and then the crushing rod is taken out of the drill rod;

s5, starting the drilling machine again, continuing to drill downwards by the drill bit, and repeating the steps S2-S4 until the drilling is completed.

Through adopting above-mentioned technical scheme, when drill bit footage speed is normal, realize the supporting role to the borehole inner wall through the inflation of air cushion, can prevent that the borehole inner wall from collapsing, when the drill bit meets the obstacle, footage speed is slower, through the shrink of air cushion, drive a plurality of locating levers and form the support to the broken pole that reciprocates to realize the broken effect of broken pole to the obstacle, the drill bit of being convenient for lasts the footage, improves pore-forming efficiency.

In summary, the application has the following beneficial effects:

1. through setting up the broken pole that can reciprocating motion in the drilling rod to set up the storage tank at the terminal surface of broken stone end of broken pole, ensure that broken pole free fall can break the hindrance thing that obstructs the drill bit footage, avoid taking a large amount of time because of using the drill bit to break the hindrance thing, effectively improved the advance chi speed of drill bit, and then promoted pore-forming efficiency.

2. Through the expansion and contraction effect of the air cushion, the pushing away and pulling back of the arc pressing plate relative to the drill rod are realized, after the arc pressing plate is pushed away, the arc pressing plate is attached to the inner wall of the well hole, so that the supporting effect on the inner wall of the well hole is formed, mud between the inner wall of the well hole and the arc pressing plate can be compacted, and the wall protection effect after the mud is solidified is improved.

3. The air cushion and the arc-shaped pressing plate are connected through the sliding block and the clamping groove, the positioning rod and the arc-shaped pressing plate are connected through the threaded rod and the threaded hole, connection reliability between the arc-shaped pressing plate and the air cushion and between the arc-shaped pressing plate and the positioning rod is guaranteed, further locking of the arc-shaped pressing plate is achieved through matching of the locking rod and the arc-shaped groove, and the arc-shaped pressing plate can reliably support the inner wall of a well hole or push the positioning rod to position the crushing rod.

Drawings

FIG. 1 is a schematic perspective view of the present application;

FIG. 2 is a cross-sectional view of the internal structure of the present application;

FIG. 3 is a schematic perspective view of a breaker bar;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 5 is a reference view of an assembled state of the arcuate pressure plate and the locating lever;

FIG. 6 is a reference view of the assembled state of the positioning rod and the threaded rod;

FIG. 7 is an operational state reference diagram of FIG. 2;

in the figure: 1. a drill rod; 10. positioning holes; 2. a sheath; 20. a connecting rod; 3. a drill bit; 4. a breaker bar; 40. a receiving groove; 5. a positioning rod; 51. a threaded hole; 52. an arc-shaped groove;

6. an arc-shaped pressing plate; 61. a clamping groove; 62. a threaded rod; 63. a locking lever; 7. an air cushion; 70. a sliding block.

Detailed Description

The application is described in further detail below with reference to fig. 1-7.

The example discloses a micro-hole bored pile drilling equipment.

Fig. 1 is a schematic perspective view of the present application. Referring to fig. 1, the micro-hole bored pile drilling equipment comprises a drill rod 1, a sheath 2, a drill bit 3 and a crushing rod 4, wherein the sheath 2 is arranged on the outer side of the drill rod 1, the crushing rod 4 is arranged on the inner side of the drill rod 1, the sheath 2 is sleeved on the outer side of the drill rod 1, the inner wall of the sheath 2 is connected with the outer wall of the drill rod 1 through a connecting rod 20, the drill bit 3 is arranged at the bottom of the drill rod 1, the drill bit 3 drills downwards to form a borehole, the outer wall of the sheath 2 is attached to the inner wall of the borehole, so that the supporting effect on the just drilled borehole can be achieved, the stability of the borehole is improved, and the borehole can be prevented from collapsing to a certain extent;

the drilling rod 1 is hollow and tubular structure that links up and down, and broken pole 4 wears to establish in drilling rod 1, and broken pole 4's length is greater than drilling rod 1's length, and broken stone end and the loop wheel machine of broken pole 4 are connected, and broken stone end of broken pole 4 is located drilling rod 1, and the loop wheel machine realizes the promotion of broken pole 4 height through hanging the hoist end of moving broken pole 4, and after the linking action of loop wheel machine and broken pole 4 was relieved, broken pole 4 can freely fall in drilling rod 1. The end face of the broken stone end of the breaking rod 4 is provided with a containing groove 40, when the breaking rod 4 continuously falls in the drill rod 1, the containing groove 40 can be sleeved into the drill bit 3, and at the moment, the end face of the broken stone end of the breaking rod 4 can extend to the lower part of the end face of the drill bit 3, so that the impact and breaking action on the obstacle for preventing the drill bit 3 from going downwards is formed.

Fig. 2 is a sectional view of the internal structure of the present application, and fig. 3 is a schematic perspective view of a crushing rod. Referring to fig. 2 and 3 in combination with fig. 1, at least two positioning groups are provided on the outer wall of the drill rod 1, one positioning group comprises a plurality of positioning rods 5, a plurality of positioning holes 10 are provided on the outer wall of the drill rod 1, the plurality of positioning rods 10 are arranged at intervals along the outer circumference of the drill rod 1, the plurality of positioning rods 5 are respectively and correspondingly penetrated in the plurality of positioning holes 10, the plurality of positioning rods 5 in the same positioning group are positioned in the same plane, the plurality of positioning rods 5 are all directed to the axis of the drill rod 1, one end of each positioning rod 5 is positioned at the outer side of the drill rod 1 or in the positioning holes 10, the other end of each positioning rod 5 is positioned at the inner side of the drill rod 1, the other ends of the positioning rods 5 in the same positioning group form a channel at the inner side of the drill rod 1, and the broken rods 4 penetrate into the channel after entering the drill rod 1, and in the broken rods 4 finish the impact process of the broken stone, so that the broken stone 4 can keep the coaxial posture of the drill rod 1 downwards and impact the broken stone, and the broken stone is in the state of being smoothly contacted with the end of the drill rod 4 when the broken rod 4 is positioned in the channel 40, and the channel is formed by the channel 4.

Fig. 4 is an enlarged schematic view of the structure at a in fig. 1. Referring to fig. 3 in combination with fig. 1, when the feed speed of the drill bit 3 is slower than the expected speed and indicates that the drill bit 3 encounters an obstacle which is difficult to break, the drill bit 3 stops rotating, and the lifting end of the crushing rod 4 is lifted by the crane, so that the crushing rod 4 is lifted into the drill rod 1, after the crushing rod 4 is positioned and clamped by one positioning group, the crane releases the connection with the crushing rod 4, then the crushing rod 4 can freely fall under the clamping action of a plurality of positioning rods 5 of the positioning group, during the falling process of the crushing rod 4, the accommodating groove 40 of the crushed stone end of the crushing rod 4 can be sleeved into the drill bit 3, namely, the drill bit 3 can be displaced in the accommodating groove 40 for a certain distance and is completely wrapped by the accommodating groove 40, the notch of the accommodating groove 40 (namely, the end face of the crushed stone end of the crushing rod 4) can be contacted with the obstacle, so that the impact action on the obstacle is formed, after the obstacle is crushed by the crushing rod 4, the drill is started again, and the drill bit 3 continues to drill downwards. In order to ensure that the receiving groove 40 on the crushing rod 4 can reliably and adaptively sleeve the drill bit 3 after the crushing rod 4 falls, a mark can be arranged on the top end surface of the drill rod 1 to indicate the position of the drill bit 3, and then the relative position of the crushing rod 4 and the drill rod 1 is adjusted before the crushing rod 4 is released, further, the size of the receiving groove 40 can be enlarged, and a margin is reserved for butt joint between the receiving groove 40 and the drill bit 3.

Fig. 5 is an assembled state reference diagram of the arc-shaped pressing plate and the positioning rod, and fig. 6 is an assembled state reference diagram of the positioning rod and the threaded rod. Referring to fig. 5 and 6, the positioning rod 5 is in clearance fit with the positioning hole 10, that is, the positioning rod 5 can slide in the positioning hole 10, a threaded hole 51 and an arc groove 52 are formed in an end face of one end, close to the outer side of the drill rod 1, of the positioning rod 5, a threaded rod 62 and a locking rod 63 are arranged on one side, facing the positioning rod 5, of the arc pressing plate 6, the threaded rod 62 is adaptively screwed in the threaded hole 51, when the threaded rod 62 is about to be completely screwed in the threaded hole 51, the arc pressing plate 6 is to be attached to the positioning rod 5, a pair of locking rods can be inserted into the pair of arc grooves 52, the locking rods can slide in the arc grooves 52 along with rotation of the arc pressing plate 6, the width of the arc grooves 52 is gradually reduced along the sliding direction of the locking rods, after the threaded rod 62 is completely screwed in the threaded hole 51, the locking rod 63 is blocked in the arc grooves 52, and the arc pressing plate 6 is reliably connected with the positioning rod 5.

Fig. 7 is an operation state reference diagram of fig. 2. Referring to fig. 7 in combination with fig. 2 and 5, a plurality of air cushions 7 are further arranged between the arc pressing plate 6 and the outer wall of the drill rod 1, an air cushion 7 is arranged on two sides of one arc pressing plate 6, one side of the air cushion 7 is fixedly connected with the outer wall of the drill rod 1, two sliding blocks 70 are arranged on the other side of the air cushion 7, two clamping grooves 61 extending along the axial direction of the drill rod 1 are further arranged on the arc pressing plate 6, the two clamping grooves 61 on one arc pressing plate 6 respectively correspond to the two sliding blocks 70 on the two air cushions 7, after the sliding blocks 70 slide into the clamping grooves 61 from the upper end face of the arc pressing plate 6, only axial relative movement can be realized between the air cushion 7 and the arc pressing plate 6 through the matching of the sliding blocks 70 and the dovetail clamping grooves 61, and radial relative movement cannot be realized, thus, after an air source outside air supplies air to the air cushion 7 through an air pipe (the air supply supplies air to the air cushion 7 or pumps from the air cushion 7 to the conventional technology, not shown in the figure), the arc pressing plate 6 is pushed to move towards the direction away from the drill rod 1, after the arc pressing plate 6 is attached to the inner wall of the well hole 1, the air intake plate 7 is stopped, the slurry is driven to rotate, the slurry wall is solidified, and the slurry wall is cured, and the slurry can be cured.

When the air cushion 7 is in an expansion state, the positioning rod 5 slides in the positioning hole 10, and the positioning rod 5 cannot slide to the outer side of the drill rod 1, so that the guiding and limiting effects on the movement of the arc-shaped pressing plate 6 can be achieved, the air in the air cushion 7 can be conveniently pumped out by an air source, and the arc-shaped pressing plate 6 can be reliably reset after the air cushion 7 is contracted. Through the cooperation of draw-in groove 61 and slider 70, the cooperation of arc groove 52 and locking pole 63 and the cooperation of screw hole 51 and threaded rod 62, guarantee to be connected reliably and be convenient for dismouting between arc clamp plate 6 and the locating lever 5, like this, can select the arc clamp plate 6 of different radians according to the borehole of equidimension, ensure that arc clamp plate 6 and the inner wall laminating of borehole after, can play the effect that promotes and support and protect the wall effect.

The embodiment also discloses a rapid drilling construction method for the micro-hole cast-in-place pile.

The quick drilling construction method of the micro-hole cast-in-place pile comprises the following steps:

s1, selecting a drilling position, placing a drill rod 1 with a drill bit 3 at the position, and driving the drill rod 1 to rotate through a drilling machine so as to form a borehole at the drilling position;

s2, under the condition that the drill bit 3 continuously runs downwards, the depth of a well hole is gradually deepened, when the drill rod 1 completely enters the well hole, the running power of the drilling machine is reduced to the lowest state every 40-60cm after entering the well hole, at the moment, the drill rod 1 and the drill bit 3 slowly rotate, then an air source supplies air to the air cushion 7, and the air cushion 7 pushes the arc-shaped pressing plate 6 to compact the inner wall of the well hole and rotate in a manner of being attached to the inner wall of the well hole after expanding;

s3, after the air cushion 7 is maintained for 2-5min, the air source is used for exhausting air from the air cushion 7, after the arc-shaped pressing plate 6 is attached to the drill rod 1, the drilling machine is closed, the crushing rod 4 is hung into the drill rod 1 through the crane, after the crushing rod 4 passes through a channel formed by a positioning group, the crane releases the crushing rod 4, so that the crushing rod 4 freely falls in the drill rod 1, and after the crushing rod 4 falls to the bottom of a well hole, the crane lifts the crushing rod 4 to a high position;

s4, the crushing rod 4 reciprocates in the vertical direction and impacts an obstacle, and after the obstacle is crushed, the crane takes out the crushing rod 4 from the drill rod 1;

s5, starting the drilling machine and gradually increasing the power, continuing to drill downwards by the drill bit 3, and repeating the steps S2-S4 until the drilling is completed.

Through implementation of the method, after the drill bit 3 encounters an obstacle, the crushing rod 4 is hoisted by the crane, the obstacle is broken by utilizing impact force generated when the crushing rod 4 falls freely, the drill bit 3 can be ensured to continuously enter into a footage, the effect of improving the hole forming efficiency is achieved while the service life of the drill bit 3 is prolonged, moreover, when the drill bit 3 normally drills and has no obstacle interference, the air source realizes the driving action on the arc pressing plate 6 by controlling the expansion and contraction of the air cushion 7, when the arc pressing plate 6 is jointed with the inner wall of a well hole and rotates, the plastering and compaction action on slurry on the inner wall of the well hole can be realized, the wall protecting effect after the slurry is solidified is improved, and the stability of the well hole drilled by the drill bit 3 is further improved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. The micro-hole bored pile drilling equipment is characterized by comprising a drill rod (1), a sheath (2) and a drill bit (3), wherein the sheath (2) is sleeved on the outer side of the drill rod (1) and is connected with the drill rod (1) through a connecting rod (20), and the drill bit (3) is arranged at the bottom of the drill rod (1);

the drill rod (1) is of a tubular structure, a crushing rod (4) is sleeved in the drill rod (1), the hoisting end of the crushing rod (4) is connected with the crane, the broken stone end of the crushing rod (4) is close to the drill bit (3) and is in a pointed cone shape, the broken stone end of the crushing rod (4) is provided with a containing groove (40), and the broken stone end of the crushing rod (4) penetrates through the drill bit (3) through the containing groove (40) to crush an obstacle.

2. A micro-hole bored pile drilling apparatus according to claim 1, wherein the drill bit (3) is adapted and movably penetrating into the accommodation groove (40), the height of the drill bit (3) being smaller than the depth of the accommodation groove (40).

3. A micro-hole bored pile drilling apparatus according to claim 1, characterized in that the length of the breaker bar (4) is greater than the length of the drill rod (1).

4. A micro-hole bored pile drilling equipment according to claim 3, wherein at least two positioning groups are arranged on the outer wall of the drill rod (1), each positioning group comprises a plurality of positioning rods (5), each positioning rod (5) is arranged on the drill rod (1) in a penetrating way through a positioning hole (10), the plurality of positioning rods (5) are arranged at intervals along the outer circumference of the drill rod (1), and one end of each positioning rod (5) located in the drill rod (1) clamps the outer wall of the crushing rod (4).

5. A micro-hole bored pile drilling apparatus according to claim 4, wherein the plurality of locating holes (10) in the same locating group are in the same horizontal plane.

6. The micro-hole bored pile drilling equipment according to claim 4, wherein a clearance fit is formed between the positioning rod (5) and the positioning hole (10), one end of the positioning rod (5) located in the drill rod (1) is spherical, the other end of the positioning rod (5) is provided with an arc-shaped pressing plate (6), the outer wall of the drill rod (1) is further provided with a plurality of air cushions (7), the air cushions (7) are arranged between the arc-shaped pressing plate (6) and the drill rod (1), and an air source controls expansion and contraction of the air cushions (7) and drives the positioning rod (5) to extend into or pull out of the drill rod (1).

7. The micro-hole bored pile drilling equipment according to claim 6, wherein an air cushion (7) is arranged between two adjacent arc-shaped pressing plates (6), and two air cushions (7) are pressed against two sides of the same arc-shaped pressing plate (6);

the inner wall of air cushion (7) with the outer wall fixed connection of drilling rod (1), the outer wall both sides of air cushion (7) are equipped with slider (70), arc clamp plate (6) are towards one side of air cushion (7) is equipped with draw-in groove (61), slider (70) adaptation ground is in draw-in groove (61).

8. The micro-hole bored pile drilling equipment according to claim 7, wherein two sliding blocks (70) are arranged on the arc-shaped pressing plate (6), and the two sliding blocks (70) are respectively arranged on two sides of the arc-shaped pressing plate (6) and are respectively arranged in two clamping grooves (61) of the two air cushions (7).

9. The micro-hole bored pile drilling equipment according to claim 7, wherein a threaded rod (62) and a pair of locking rods (63) are fixedly arranged at the middle part of one side of the arc-shaped pressing plate (6) facing the air cushion (7), a threaded hole (51) and a pair of arc-shaped grooves (52) are arranged at the end face of one side, which is contacted with the arc-shaped pressing plate (6), of the positioning rod (5), and the threaded rod (62) is adaptively screwed in the threaded hole (51);

the pair of locking rods (63) are respectively inserted into the pair of arc-shaped grooves (52) in a one-to-one correspondence manner and rotate in the arc-shaped grooves (52).

10. The quick drilling construction method of the micro-hole cast-in-place pile is characterized by comprising the following steps of:

s1, selecting a drilling position, placing a drill rod (1) with a drill bit (3) at the position, and driving the drill rod (1) to rotate through a drilling machine;

s2, after the drill rod (1) completely enters the well hole and each time the drill rod enters 40-60cm, the drilling machine drives the drill rod (1) and the drill bit (3) to rotate with the lowest power, meanwhile, the air source supplies air to the air cushion (7), and the air cushion (7) pushes the arc-shaped pressing plate (6) to compact the inner wall of the well hole after expanding;

s3, after the air cushion (7) is maintained for 2-5min, the air source is used for exhausting air from the air cushion (7), after the arc-shaped pressing plate (6) is attached to the drill rod (1), the drill bit (3) stops rotating, and the crushing rod (4) is inserted into the drill rod (1) and is enabled to fall freely;

s4, the crushing rod (4) reciprocates in the vertical direction and impacts the obstacle, and then the crushing rod (4) is taken out of the drill rod (1);

s5, starting the drilling machine again, continuing to drill downwards by the drill bit (3), and repeating the steps S2-S4 until the drilling is completed.