阅读说明：本技术 一种全套管全回转钻机清除地下咬合桩的施工方法 (Construction method for removing underground secant pile by full-casing full-slewing drilling machine ) 是由 张效次 裴国强 廖正根 唐天龙 王忠国 饶为胜 王飞 张晨晨 汪晨 崔金波 仲军 于 2021-05-26 设计创作，主要内容包括：本发明公开了一种全套管全回转钻机清除地下咬合桩的施工方法,包括：S1、确定桩体位置,并将全套管全回转钻机定位于桩体处；S2、启动全套管全回转钻机,将套管压入地下,利用破碎装置将桩体破碎；S3、利用抓取装置抓取桩体碎块和套管与桩体间的泥土后,拔出套管；S4、接长套管,重复S2～S3,直至桩体被清除；S5、将全套管全回转钻机定位于下一个桩体处进行下一个桩体的清除；其中,地下咬合桩包括多个荤桩和素桩,本发明所述的施工方法的施工顺序为：先清除所有荤桩后再清除素桩。本发明所述的施工方法通过先清除所有荤桩,后清除素桩的清除顺序清除地下咬合桩,且在清除荤桩时套管不与任一荤桩接触,可避免套管切割荤桩从而降低施工效率。(The invention discloses a construction method for removing an underground secant pile by a full-casing full-slewing drilling machine, which comprises the following steps: s1, determining the position of the pile body, and positioning the full-casing full-slewing drilling machine at the pile body; s2, starting the full-casing full-slewing drilling machine, pressing the casing into the ground, and crushing the pile body by using a crushing device; s3, grabbing fragments of the pile body and soil between the sleeve and the pile body by using a grabbing device, and then pulling out the sleeve; s4, lengthening the sleeve, and repeating S2-S3 until the pile body is removed; s5, positioning the full-casing full-slewing drilling machine at the next pile body to remove the next pile body; the underground secant pile comprises a plurality of meat piles and vegetable piles, and the construction sequence of the construction method is as follows: all meat piles are removed first, and then vegetable piles are removed. According to the construction method, all meat-bearing piles are removed firstly, then the underground secant piles are removed in the removing sequence of the vegetable-bearing piles, and the casing pipe is not in contact with any meat-bearing pile when the meat-bearing piles are removed, so that the casing pipe can be prevented from cutting the meat-bearing piles, and the construction efficiency is reduced.)

1. A construction method for removing an underground secant pile by a full-casing full-slewing drilling machine is characterized by comprising the following steps:

s1, determining the positions of all pile bodies of the underground secant pile to be cleared according to the measurement positioning, and positioning the full-casing full-slewing drilling machine at one of the pile bodies to enable the casing of the full-casing full-slewing drilling machine to completely cover the plane position of the pile body;

s2, starting the full-casing full-slewing drilling machine, pressing the casing into the ground, and crushing the pile body sleeved by the casing by using a crushing device;

s3, taking out the fragments of the pile body and the soil between the sleeve and the pile body together by using a gripping device, and then pulling out the sleeve;

s4, lengthening the sleeve, and repeating S2-S3 until the pile body is completely removed;

s5, after the pile body is completely removed, sand and soil are backfilled into the sleeve, the sleeve is gradually pulled up in the backfilling process, then the full-sleeve full-slewing drilling machine is positioned at the next pile body to be cleaned, the steps are repeated, and the next pile body is removed;

wherein, underground secant pile includes a plurality of meat stake vegetable piles that set up in turn, and any vegetable pile is close to one side of meat stake is equipped with the breach, meat stake is close to one side embedding of vegetable pile breach is in the breach, utilize full sleeve pipe full rotary drill clears away underground secant pile's order is: all meat piles are removed first, then vegetable piles are removed, and when meat piles are removed, the sleeve does not contact any other meat piles.

2. The construction method for removing the underground secant pile by the full-casing full-rotary drilling machine according to claim 1, wherein when a plurality of meat piles are removed, the meat piles are sequentially removed from two ends of the secant pile to the middle of the secant pile.

3. The construction method for removing the underground secant pile by the full-casing full-slewing drilling machine according to claim 1, wherein the crushing device is a heavy hammer or a rotary drilling rig, and when no structure is formed around the removed pile body, the pile body is crushed by the heavy hammer; and when structures are arranged around the removed pile body, the pile body is broken by using a rotary drilling rig.

4. The construction method for removing the underground secant pile by the full-casing full-slewing drilling machine according to claim 3, wherein a pulley block is arranged on a mast of the rotary drilling machine, and the construction method comprises the following steps:

the first pulley is fixedly arranged on the upper surface of the top of the mast;

the second pulley is positioned on the upper surface of the mast and fixedly arranged on one side of the mast, which is far away from the power head of the rotary drilling rig;

the third pulley is arranged on one side, far away from the power head, of the mast through a fixing frame, one end of the fixing frame is fixedly connected with one side of the middle part of the mast, the upper surface of the other end of the fixing frame is connected with the third pulley, and the third pulley is located below the second pulley;

two ends of the first steel wire rope are respectively wound on the first pulley and the second pulley, and the first steel wire rope positioned between the first pulley and the second pulley is wound on the third pulley and is supported by one side of the third pulley close to the power head;

a drum that fixedly winds the first wire rope between the third sheave and the second sheave.

5. The construction method for removing the underground secant pile by the full-casing full-slewing drilling machine according to claim 4, wherein the fixing frame is of an L-shaped structure, one end of a horizontal part of the fixing frame is fixedly connected with the middle part of one side of the mast, one side of the other end of the fixing frame is hinged with one end of a vertical part of the fixing frame, a first guide rail is arranged on the upper surface of the vertical part along the length direction of the vertical part, and the third pulley is arranged on the first guide rail in a sliding manner.

6. The construction method for removing an underground secant pile by using a full-casing full-slewing drilling machine according to claim 4, wherein a moving device is arranged between the mast and the power head, and comprises the following steps:

the limiting frame is of a U-shaped structure, the opening of the limiting frame faces the power head, one side of the bottom edge of the limiting frame is fixedly connected with the mast, second guide rails are horizontally arranged on two parallel edges of the limiting frame, a cross rod is arranged on any one second guide rail in a sliding mode, a through hole is formed in the length direction of the cross rod, a vertical rod is vertically and fixedly arranged between the pair of cross rods, and the power head is arranged on the vertical rod;

the pair of screw rods are respectively horizontally arranged in the through holes of the pair of cross rods, one ends of the screw rods are positioned on the parallel edges of the limiting frame, and the other ends of the screw rods are clamped in the through holes of the cross rods;

the pair of rotating shaft wheels are respectively arranged on two parallel edges of the limiting frame and are positioned on one side of the limiting frame close to the mast, a motor is arranged at the top of any rotating shaft wheel, and an output shaft of the motor is coaxially arranged with the rotating shaft wheels;

and one end of any second steel wire rope is wound on the rotating shaft wheel, and the other end of the second steel wire rope is connected with the end part of the screw rod positioned on the parallel edge of the limiting frame.

7. The construction method for clearing the underground secant pile by the full-casing full-slewing drilling machine according to claim 6, further comprising a slide rail which is vertically and fixedly arranged on one side of the vertical rod close to the power head, and the power head is arranged on the slide rail in a sliding manner along the height direction of the mast.

8. The construction method for clearing the underground secant pile by the full-casing full-slewing drilling machine according to claim 3, wherein the grabbing device is a flushing grab bucket or the rotary drilling rig, and when the pile body fragments needing to be cleared are located in a silt and clay stratum, the flushing grab bucket is used for taking out the pile body fragments and the soil between the casing and the pile body; when the pile body fragments needing to be cleaned are located in the sandy soil and pebble stratum, the pile body fragments and soil between the sleeve and the pile body are taken out by using a rotary drilling rig.

9. The construction method of removing the underground secant pile by the full-casing full-slewing drilling machine according to claim 1, wherein in step S4, when the removed pile body has a structure around and the bottom of the casing is located in the quicksand formation, water is injected into the casing pressed into the ground through the water injection pipe, and the casing is lengthened after the water level is higher than the ground level.

Technical Field

The invention relates to the field of removing underground obstacles in engineering construction. More particularly, the invention relates to a construction method for removing an underground secant pile by a full-casing full-slewing drilling machine.

Background

With the rapid development of the engineering construction field, many projects have to be built on the basis of old buildings at present. The existence of the old foundations greatly increases the difficulty of engineering construction, and underground obstacles must be cleared to ensure the smooth implementation of engineering.

The current common methods for removing underground obstacles comprise an impact drilling method and a full-casing full-rotation method, wherein the impact drilling method has large influence on the surrounding environment and low efficiency, and the application range of the method is greatly limited; when the conventional full-casing full-rotation method is used for removing underground obstacles, the cleaning efficiency of the independent obstacles is high, but the high efficiency of the obstacles existing in pieces cannot be exerted. Particularly, in the pile foundation clearing project, the full-casing full-rotation method has good applicability to single piles or grouped piles with large pile spacing, but cannot exert the advantage of high efficiency on row piles and secant piles with small pile spacing. Meanwhile, the influence of the conventional full-casing full-rotation method on adjacent structures when underground obstacles are cleared is not negligible. Therefore, a method for removing the underground secant pile by the full-casing full-slewing drilling machine is needed to be designed, so that the full-casing full-slewing drilling machine can efficiently remove the underground secant pile, has little influence on an adjacent structure, and has high application value.

Disclosure of Invention

Still another object of the present invention is to provide a construction method for removing underground secant piles in the sequence of removing all meat piles and then vegetable piles by using a full-casing full-rotary drilling machine, wherein the casing does not contact any meat pile when the meat piles are removed, and the casing can be prevented from cutting the meat piles, thereby reducing the construction efficiency.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a construction method for removing an underground secant pile by a full casing full slewing drilling machine, comprising:

s1, determining the positions of all pile bodies of the underground secant pile to be cleared according to the measurement positioning, and positioning the full-casing full-slewing drilling machine at one of the pile bodies to enable the casing of the full-casing full-slewing drilling machine to completely cover the plane position of the pile body;

s2, starting the full-casing full-slewing drilling machine, pressing the casing into the ground, and crushing the pile body sleeved by the casing by using a crushing device;

s3, taking out the fragments of the pile body and the soil between the sleeve and the pile body together by using a gripping device, and then pulling out the sleeve;

s4, lengthening the sleeve, and repeating S2-S3 until the pile body is completely removed;

s5, after the pile body is completely removed, sand and soil are backfilled into the sleeve, the sleeve is gradually pulled up in the backfilling process, then the full-sleeve full-slewing drilling machine is positioned at the next pile body to be cleaned, the steps are repeated, and the next pile body is removed;

wherein, underground secant pile includes a plurality of meat stake vegetable piles that set up in turn, and any vegetable pile is close to one side of meat stake is equipped with the breach, meat stake is close to one side embedding of vegetable pile breach is in the breach, utilize full sleeve pipe full rotary drill clears away underground secant pile's order is: all meat piles are removed first, then vegetable piles are removed, and when meat piles are removed, the sleeve does not contact any other meat piles.

Preferably, when a plurality of meat piles are removed, the meat piles are sequentially removed from two ends of the snap-in pile to the middle of the snap-in pile.

Preferably, the crushing device is a heavy hammer or a rotary drilling rig, and when no structure is arranged around the removed pile body, the heavy hammer is used for crushing the pile body; and when structures are arranged around the removed pile body, the pile body is broken by using a rotary drilling rig.

Preferably, a pulley block is arranged on a mast of the rotary drilling rig, and the rotary drilling rig comprises:

the first pulley is fixedly arranged on the upper surface of the top of the mast;

the second pulley is positioned on the upper surface of the mast and fixedly arranged on one side of the mast, which is far away from the power head of the rotary drilling rig;

the third pulley is arranged on one side, far away from the power head, of the mast through a fixing frame, one end of the fixing frame is fixedly connected with one side of the middle part of the mast, the upper surface of the other end of the fixing frame is connected with the third pulley, and the third pulley is located below the second pulley;

two ends of the first steel wire rope are respectively wound on the first pulley and the second pulley, and the first steel wire rope positioned between the first pulley and the second pulley is wound on the third pulley and is supported by one side of the third pulley close to the power head;

a drum that fixedly winds the first wire rope between the third sheave and the second sheave.

Preferably, the fixing frame is of an L-shaped structure, one end of a horizontal portion of the fixing frame is fixedly connected with the middle portion of one side of the mast, one side of the other end of the fixing frame is hinged with one end of a vertical portion of the fixing frame, a first guide rail is arranged on the upper surface of the vertical portion along the length direction of the vertical portion, and the third pulley is slidably arranged on the first guide rail.

Preferably, a moving device is arranged between the mast and the power head, and comprises:

the limiting frame is of a U-shaped structure, the opening of the limiting frame faces the power head, one side of the bottom edge of the limiting frame is fixedly connected with the mast, second guide rails are horizontally arranged on two parallel edges of the limiting frame, a cross rod is arranged on any one second guide rail in a sliding mode, a through hole is formed in the length direction of the cross rod, a vertical rod is vertically and fixedly arranged between the pair of cross rods, and the power head is arranged on the vertical rod;

the pair of screw rods are respectively horizontally arranged in the through holes of the pair of cross rods, one ends of the screw rods are positioned on the parallel edges of the limiting frame, and the other ends of the screw rods are clamped in the through holes of the cross rods;

the pair of rotating shaft wheels are respectively arranged on two parallel edges of the limiting frame and are positioned on one side of the limiting frame close to the mast, a motor is arranged at the top of any rotating shaft wheel, and an output shaft of the motor is coaxially arranged with the rotating shaft wheels;

and one end of any second steel wire rope is wound on the rotating shaft wheel, and the other end of the second steel wire rope is connected with the end part of the screw rod positioned on the parallel edge of the limiting frame.

Preferably, the power head further comprises a slide rail, the slide rail is vertically and fixedly arranged on one side of the vertical rod close to the power head, and the power head is arranged on the slide rail in a sliding manner along the height direction of the mast.

Preferably, the grabbing device is a grab bucket or the rotary drilling rig, and when the pile body fragments needing to be cleaned are located in silt soil and clay strata, the grab bucket is used for taking out the pile body fragments and soil between the sleeve and the pile body; when the pile body fragments needing to be cleaned are located in the sandy soil and pebble stratum, the pile body fragments and soil between the sleeve and the pile body are taken out by using a rotary drilling rig.

Preferably, in step S4, when a structure is formed around the removed pile body and the bottom of the casing is located in the quicksand formation, water is injected into the casing pressed into the ground through the water injection pipe, and the casing is lengthened after the water level is higher than the ground level.

The invention at least comprises the following beneficial effects:

1. according to the construction method, all meat-bearing piles are removed firstly, then the underground secant piles are removed in the removing sequence of the vegetable-bearing piles, and the casing pipe is not contacted with any meat-bearing pile when the meat-bearing piles are removed, so that the phenomenon that the casing pipe cuts the meat-bearing piles can be avoided, and the construction efficiency is reduced;

2. according to the construction method, the rotary drilling rig is used for crushing the pile body with the surrounding structures, so that the purpose of non-disturbance construction of the adjacent structures can be achieved;

3. the construction method of the invention selects different cleaning modes of the pile body fragments according to the stratum conditions of the pile body fragments, thus improving the working efficiency;

4. when the periphery of the cleaned pile body is provided with a structure and the bottom of the sleeve is positioned in a quicksand stratum, water is injected into the sleeve to balance the pressure difference between the inner soil and the outer soil of the sleeve, so that the phenomena of soil and sand gushing at the bottom of the sleeve can be greatly avoided, and the protection of the structure at the periphery of the pile body is facilitated.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic illustration of a construction sequence for removing an underground secant pile by a full-casing full-slewing drilling machine according to an embodiment of the invention;

FIG. 2 is a schematic diagram of the construction of a pile for breaking meat using a heavy hammer according to the above embodiment;

FIG. 3 is a schematic view of the above embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a rotary drilling rig, a pulley block and a moving device;

FIG. 5 is a schematic top view of the fixing frame;

fig. 6 is a schematic structural diagram of a mobile device.

The specification reference numbers indicate:

1. the device comprises a sleeve, 2, a meat pile, 3, a vegetable pile, 4, a full-sleeve full-rotation drilling machine, 5, a crawler crane, 6, a heavy hammer, 7, a rotary drilling machine, 8, a mast, 9, a first pulley, 10, a second pulley, 11, a third pulley, 12, a winding drum, 13, a first steel wire rope, 14, a fixing frame, 15, a power head, 16, a moving device, 17, a limiting frame, 18, a cross rod, 19, a vertical rod, 20, a screw rod, 21, a motor, 22, a second steel wire rope, 23, a sliding rail, 24, a second guide rail, 25, a water injection pipe, 26, a rotating shaft wheel, 27 and a first guide rail.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the invention provides a construction method for removing an underground secant pile by a full-casing full-slewing drilling machine, which comprises the following steps:

s1, determining the positions of all pile bodies of the underground secant pile to be cleared according to the measurement positioning, and positioning the full-casing full-slewing drilling machine 4 at one of the pile bodies so that the casing 1 of the full-casing full-slewing drilling machine can completely cover the plane position of the pile body;

s2, starting the full-casing full-slewing drilling machine 4, pressing the casing 1 into the ground, and crushing the pile body sleeved by the casing 1 by using a crushing device;

s3, taking out the fragments of the pile body and the soil between the sleeve and the pile body together by using a gripping device, and then pulling out the sleeve 1;

s4, lengthening the casing pipe 1, and repeating S2-S3 until the pile body is completely removed;

s5, after the pile body is completely removed, backfilling sandy soil into the sleeve 1, gradually pulling up the sleeve 1 in the backfilling process, then positioning the full-sleeve full-slewing drilling machine 4 at the next pile body to be cleaned, repeating the steps, and removing the next pile body;

wherein, underground secant pile includes 2 plain piles 3 of meat stake that a plurality of alternate settings, and arbitrary plain pile 3 is close to one side of meat stake 2 is equipped with the breach, meat stake 2 is close to one side embedding of 3 breachs of vegetable stake is in the breach, utilize full sleeve pipe full rotary drill 4 clears away underground secant pile's order is: all meat piles 2 are removed first, then the vegetable piles 3 are removed, and when the meat piles 2 are removed, the sleeve 1 is not in contact with any other meat pile 2.

In the technical scheme, the arrangement mode of the secant pile bodies is that a concrete pile (meat pile) with a steel reinforcement cage and a concrete pile (vegetable pile) without the steel reinforcement cage are alternately arranged, one side of the vegetable pile 3 close to the meat pile 2 is provided with a notch, the meat pile 2 is embedded in the notch, the position of the meat pile 2 is higher in strength than the surrounding soil body due to the fact that steel reinforcements are arranged in the meat pile 2, when the meat pile 2 is cleared, if a cutter head at the bottom of the casing 1 cuts the meat pile 2 when the casing 1 is pressed into the ground, the casing 1 can be deviated, and therefore the working efficiency is reduced, namely the casing 1 is not in contact with any other meat pile 2 when being set, and then all pile bodies are cleared according to the mode of clearing all the meat piles 2 and then clearing the vegetable pile 3. Because the pile body to be removed is buried deeply, if the sleeve 1 is lengthened to the depth of the pile body and is pressed into the ground for removing the pile body at one time, the construction conditions and the method have high requirements, and the quality cannot be ensured, so the method of the application is adopted to lengthen the sleeve 1 in sections, and then the pile body is removed in sections, and the construction quality can be ensured.

In another technical scheme, when a plurality of meat piles 2 are removed, the meat piles 2 are removed in sequence from two ends of the snap pile to the middle of the snap pile.

In the technical scheme, the pile 2 is marked as B1, B2, B3, B4, B5 and B6 in sequence, the sleeve 1 is marked as (I), (III), (IV), (V) and (VI) in sequence, the cleaning sequence of the pile 2 can be B1-B6-B2-B5-B3-B4, the arrangement sequence of the corresponding sleeve 1 is (I), (III), (IV) and (VI), the pile 2 can be cleaned by adopting the cleaning sequence, the sleeve 1 does not contact with the surrounding pile 2 when the pile 2 is cleaned, other pile 2 can be cleaned while the backfill soil in the cleaned pile 2 is solidified, and the construction efficiency is further improved.

In another technical solution, as shown in fig. 2 and 4, the crushing device is a heavy hammer 6 or a rotary drilling rig 7, and when there is no structure around the removed pile, the heavy hammer 6 is used to crush the pile; when structures are arranged around the removed pile body, the pile body is broken by using a rotary drilling rig 7; and a pulley block is arranged on a mast 8 of the rotary drilling rig 7, and comprises:

a first pulley 9 fixedly disposed on an upper surface of a top of the mast 8;

the second pulley 10 is positioned on the upper surface of the mast 8 and is fixedly arranged on one side of the mast 8, which is far away from a power head 15 of the rotary drilling rig 7;

the third pulley 11 is arranged on one side, far away from the power head 15, of the mast 8 through a fixing frame 14, one end of the fixing frame 14 is fixedly connected with one side of the middle of the mast 8, the upper surface of the other end of the fixing frame is connected with the third pulley 11, and the third pulley 11 is located below the second pulley 10;

two ends of a first steel wire rope 13 are respectively wound on the first pulley 9 and the second pulley 10, and the first steel wire rope 13 between the first pulley 9 and the second pulley 10 is wound on the third pulley 11 and is supported by one side of the third pulley 11 close to the power head 15;

a drum 12 fixedly wound around the first wire rope 13 between the third sheave 11 and the second sheave 10.

In the technical scheme, the pile body crushing mode of the rotary drilling rig 7 is the same as the pile body crushing mode of the conventional rotary drilling rig, stable pressurization is provided for the whole process that the drill rod of the rotary drilling rig 7 extends downwards from the top of the sleeve 1 to the position of the pile body and crushes the pile body through the power head 15 on the mast 8, but in the pressurization process, the power head 15 can vibrate to drive the mast 8 to rock, and because the suspension section of the first steel wire rope 13 on the rotary drilling rig 7 is too long, the first steel wire rope 13 is easy to shake and throw to other parts in the shaking process of the mast 8, unnecessary vibration is brought to the rotary drilling rig 7, the stability of the mast 8 is further influenced, and the stability of the whole machine of the rotary drilling rig 7 in the construction process is influenced, namely, the first pulley 9 and the second pulley are sequentially arranged on the mast 8 from top to bottom along the height direction of the mast 8, The third pulley 11 is arranged in the middle of the mast 8 through a fixing frame 14, one end of the steel wire rope is connected with the first pulley 9, the other end of the steel wire rope is downwards wound on the third pulley 11 and then connected with the second pulley 10, and the winding drum 12 is wound on the first steel wire rope 13 between the third pulley 11 and the second pulley 10; by arranging the third pulley 11 between the first pulley 9 and the winding drum 12, the section of the first steel wire rope 13 between the winding drum 12 and the first pulley 9 can be tightened and can not be freely suspended, and because the winding drum 12 has a certain weight, the winding drum 12 can not easily generate violent shaking in the working process of the rotary drilling rig 7 to shake the first steel wire rope 13, so that the shaking of the section of the steel wire rope is reduced, the possibility of the steel wire rope being thrown to other parts is reduced, in addition, the third pulley 11 also compresses the section of the suspended steel wire rope towards the direction of the power head 15, the included angle between the first steel wire rope 13 on the first pulley 9 and the height direction of the mast 8 at one side of the winding drum 12 is reduced, the rope inlet angle of the first pulley 9 is reduced, but the tension on the first steel wire rope 13 is unchanged, namely, the component of the tension of the first steel wire rope 13 in the horizontal direction is reduced, therefore, the transverse acting force from the first steel wire rope 13 on the first pulley 9 is reduced, the swinging of the mast 8 is limited, the construction safety is improved, meanwhile, the rotary drilling rig 7 cannot vibrate when crushing the pile body, and the purpose of undisturbed construction of adjacent structures is achieved, the weight 6 is hoisted through the crawler crane 5 in a mode of crushing the pile body through the weight 6, and the pile body is crushed downwards through the extension of the top of the sleeve 1.

In another technical solution, as shown in fig. 5, the fixing frame 14 is an L-shaped structure, one end of a horizontal portion of the fixing frame is fixedly connected with a middle portion of one side of the mast 8, one side of the other end of the fixing frame is hinged with one end of a vertical portion of the fixing frame 14, a first guide rail 27 is arranged on an upper surface of the vertical portion along a length direction of the vertical portion, and the third pulley 11 is slidably arranged on the first guide rail 27.

In the technical scheme, when the vertical part of the fixing frame is arranged perpendicular to the mast, the third pulley 11 can move on the vertical part along the horizontal plane, when the vertical part of the fixing frame rotates towards the height direction of the mast, the third pulley 11 can be driven to move on the vertical plane, so that the third pulley 11 can drive the first steel wire rope 13 wound on the third pulley to move on the horizontal plane and the vertical plane, namely, in the whole process of the work of the rotary drilling rig 7, the position of the third pulley 11 relative to the mast 8 can be manually adjusted at any time, the included angle between the first steel wire rope 13 on the first pulley 9 and the height direction of the mast 8 is further adjusted, the acting force of the first steel wire rope 13 on the first pulley 9 is reduced, the swing of the mast 8 is limited, and after the rotary drilling rig 7 finishes the work and needs to move to the next place, the position of the third pulley 11 can also be adjusted so that the first steel wire rope 13 between the third pulley 11 and the winding drum 12 is arranged vertically downwards, the stability of the winding drum 12 is enhanced, the winding drum 12 is prevented from shaking during the moving process of the rotary drilling rig 7, the first steel wire rope 13 is prevented from being worn, and the service life of the first steel wire rope 13 is prolonged.

In another solution, as shown in fig. 6, a moving device 16 is disposed between the mast 8 and the power head 15, and includes:

the limiting frame 17 is of a U-shaped structure, the opening of the limiting frame faces the power head 15, one side of the bottom edge of the limiting frame 17 is fixedly connected with the mast 8, second guide rails 24 are horizontally arranged on two parallel edges of the limiting frame 17, a cross rod 18 is slidably arranged on any one second guide rail 24, a through hole is formed in the length direction of the cross rod 18, a vertical rod 19 is vertically and fixedly arranged between a pair of cross rods 18, and the power head 15 is arranged on the vertical rod 19;

the pair of screw rods 20 are respectively horizontally arranged in the through holes of the pair of cross rods 18, one end of each screw rod 20 is positioned on the parallel edge of the limiting frame 17, and the other end of each screw rod 20 is clamped in the through hole of the corresponding cross rod 18;

a pair of rotating shaft wheels 26 respectively arranged on two parallel edges of the limiting frame 17 and located on one side of the limiting frame 17 close to the mast 8, wherein a motor 21 is arranged at the top of any rotating shaft wheel 26, and an output shaft of the motor 21 is coaxially arranged with the rotating shaft wheels 26;

and the pair of second steel wire ropes 22 are respectively arranged on two parallel edges of the limiting frame 17, one end of each second steel wire rope 22 is wound on the rotating shaft wheel 26, and the other end of each second steel wire rope 22 is connected with the end part of the screw rod 20 positioned on the parallel edges of the limiting frame 17.

In the technical scheme, the bottom edge of a limiting frame 17 is fixedly connected with a mast 8, a pair of cross rods 18 are slidably arranged between a pair of parallel side cross rods 18 of the limiting frame 17, vertical rods 19 are vertically arranged between the side cross rods 18, a power head 15 is arranged on the vertical rods 19, a through hole is horizontally arranged in any cross rod 18, a screw rod 20 is arranged in the through hole, one end of the screw rod 20 is clamped in the through hole, the other end of the screw rod 20 penetrates out of the through hole and is connected with a rotating shaft wheel 26 positioned on the parallel side of the limiting frame 17 through a second steel wire rope 22, a motor 21 is arranged on any rotating shaft wheel 26, when the distance between the cross rod 18 and the limiting frame 17 needs to be increased, the motor 21 is only required to be driven to rotate forwardly, the motor 21 drives the rotating shaft wheel 26 to rotate, and the second steel wire rope 22 can be wound on the rotating shaft wheel 26, so that the cross rod 18 is pulled to move close to the limiting frame 17; when the distance between the cross rod 18 and the limiting frame 17 needs to be increased, the cross rod 18 can be far away from the limiting frame 17 only by reversely rotating the driving motor 21 to release the steel wire rope and then manually moving the cross rod 18, and the cross rod 18 is driven to be far away from or close to the limiting frame 17 by controlling the forward and reverse rotation of the motor 21. The moving device 16 provided by the invention can be used for controlling the distance between the power head 15 and the mast 8, so that the working gravity center of the whole rotary drilling rig 7 is adjusted in the construction process, the stability of the whole rotary drilling rig in working is improved, the reaction torque of the mast 8 is reduced, and the safety in the construction process is improved.

In another technical scheme, the power head device further comprises a slide rail 23, the slide rail 23 is vertically and fixedly arranged on one side of the vertical rod 19 close to the power head 15, and the power head 15 is arranged on the slide rail 23 in a sliding manner along the height direction of the mast 8.

In the technical scheme, a slide rail 23 is vertically arranged on one side of the vertical rod 19 close to the power head 15, the power head 15 is movably arranged on the slide rail 23, and the position of the power head 15 can be adjusted according to the height of the casing pipe 1, so that a drill rod on the power head 15 can smoothly enter and exit the casing pipe 1.

In another technical scheme, the grabbing device is a grab bucket or the rotary drilling rig 7, and when the pile body fragments needing to be cleaned are located in silt soil and clay strata, the grab bucket is used for taking out the pile body fragments and soil between the sleeve 1 and the pile body; when the pile body fragments needing to be cleaned are located in the sandy soil and pebble stratum, the pile body fragments and soil between the sleeve 1 and the pile body are taken out by using the rotary drilling rig 7.

In another technical solution, as shown in fig. 3, in step S4, when there is a structure around the removed pile and the bottom of the casing 1 is located in the quicksand formation, water is injected into the casing 1 pressed into the ground through the water injection pipe 25, and the casing 1 is lengthened after the water level is higher than the ground level.

In the technical scheme, if structures are arranged on the periphery and the bottom of the sleeve 1 is a quicksand stratum, the bottom of the sleeve 1 often has the phenomena of soil gushing, sand gushing and the like, so that the peripheral structures are adversely affected, and water is injected into the sleeve 1 to balance the pressure difference between the soil inside and the soil outside the sleeve 1, so that the phenomena of soil gushing and sand gushing at the bottom of the sleeve 1 can be greatly avoided, and the protection of the peripheral structures is facilitated.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.