阅读说明：本技术 一种采用双套管拔除超长桩的方法 (Method for removing ultra-long pile by adopting double sleeves ) 是由 檀俊坤 乔世范 张细宝 朱红光 谭新根 赵勇 刘恒 杨剑 周学彬 陈长胜 彭祖民 于 2019-10-30 设计创作，主要内容包括：本发明公开一种采用双套管拔除超长桩的方法,步骤如下：第一步、装双套管拔桩装置；第二步、将双套管拔桩装置调至长桩桩位,并将桩头置于双套管拔桩装置内；第三步、将双套管拔桩装置沉入地下；第四步、将内套管、内套管内部的土体及桩头同步提起；第五步、取出外套管；第六步、回填桩孔。应用本发明的方法,拔桩过程简单；双套管拔桩装置中外套管和内套管可滑动式连接,且内套管的外壁接触面与外套管的内壁接触面之间的摩擦系数小于外套管的外壁接触面与土体的摩擦系数,拔桩时,内套管与土体一起拔出,将原有拔桩时桩土之间所受的摩擦力转移至内套管与外套管之间的摩擦力,减小机械拔桩拉力的要求,可大大提高拔桩效率。(The invention discloses a method for removing an ultralong pile by adopting double sleeves, which comprises the following steps: firstly, installing a double-sleeve pile pulling device; secondly, adjusting the double-sleeve pile pulling device to a long pile position, and placing a pile head in the double-sleeve pile pulling device; thirdly, sinking the double-casing pile pulling device into the ground; step four, synchronously lifting the soil body and the pile head inside the inner sleeve and the inner sleeve; fifthly, taking out the outer sleeve; and sixthly, backfilling pile holes. The pile pulling process is simple by applying the method of the invention; outer sleeve pipe and interior sleeve pipe slidable formula are connected in the double cannula pile pulling device, and the coefficient of friction between the inner wall contact surface of interior sheathed tube outer wall contact surface and outer tube is less than the coefficient of friction of the outer wall contact surface of outer tube and the soil body, and during pile pulling, interior sleeve pipe and soil body are extracted together, and the frictional force that receives between the stake soil shifts to the frictional force between interior sleeve pipe and the outer tube when original pile pulling, reduces the tensile requirement of mechanical pile pulling, can improve pile pulling efficiency greatly.)

1. A method for removing an ultralong pile by adopting a double-sleeve pile pulling device is characterized in that the pile pulling device is adopted for pile pulling, the double-sleeve pile pulling device comprises an outer sleeve (1) and an inner sleeve (2) connected with the outer sleeve (1) in a sliding manner, and the friction coefficient between the contact surface of the outer wall of the inner sleeve (2) and the contact surface of the inner wall of the outer sleeve (1) is smaller than the friction coefficient between the contact surface of the outer wall of the outer sleeve and a soil body; the inner sleeve (2) comprises a section of inner annular pipe or at least two sections of inner annular pipes which are spliced in series along the length direction of the inner sleeve, and the plurality of sections of inner annular pipes are detachably connected;

the pile pulling process is as follows:

firstly, assembling a double-sleeve pile pulling device;

secondly, moving the double-sleeve pile pulling device to a pile position, and placing a pile head to be pulled in the inner sleeve (2);

thirdly, sinking the double-casing pile pulling device into the ground;

step four, synchronously lifting the inner sleeve (2), the soil body and the pile inside the inner sleeve;

fifthly, taking out the outer sleeve (1);

and sixthly, backfilling pile holes.

2. The method for pulling out the ultra-long pile by using the double sleeves according to claim 1, wherein the fourth step is specifically:

s4.1, connecting the pile head of the pile to be pulled and the upper end of the inner sleeve, and synchronously lifting the inner sleeve and the pile;

s4.2, stopping lifting when the lower end surface of the nth section of inner annular pipe in the inner sleeve pipe is higher than the ground surface, wherein n is more than or equal to 1 and less than or equal to the total number of sections of the inner annular pipe contained in the inner sleeve pipe;

s4.3, taking out the first to nth sections of inner annular tubes in the inner sleeve (2);

step S4.4: crushing or cutting off part of the pile;

step S4.5: if the pile is not pulled out, repeating the steps S4.1-S4.4; otherwise, go to the next step.

3. The method for pulling out the ultra-long pile by using the double sleeves according to any one of claims 1-2, wherein a lubricating layer is arranged between the inner sleeve (2) and the outer sleeve (1), so that the friction coefficient between the contact surface of the outer wall of the inner sleeve (2) and the contact surface of the inner wall of the outer sleeve (1) is simultaneously smaller than the friction coefficient between the contact surface of the outer wall of the outer sleeve and the soil mass and the friction coefficient between the contact surface of the inner wall of the inner sleeve and the soil mass.

4. The method for pulling out the ultra-long pile by using the double sleeves as claimed in claim 3, wherein the multiple sections of the inner annular pipes are detachably connected by the connecting piece (3); the inner annular pipe comprises at least two second arc-shaped side plates (2.1) which are assembled into a ring;

a second groove (2.2), a second boss (2.3), a third groove (2.4), a third boss (2.5), a connecting through hole (2.6) and a vent hole (2.7) are formed in the second arc-shaped side plate (2.1), and the second groove (2.2) and the second boss (2.3) are both arranged on the outer wall of the second arc-shaped side plate (2.1) and used for installing an outer sleeve and limiting the outer sleeve; the third grooves (2.4) and the third bosses (2.5) are arranged at the end parts of the second arc-shaped side plates (2.1) along the circumferential direction of the second arc-shaped side plates, and the third grooves (2.4) and the third bosses (2.5) of one second arc-shaped side plate (2.1) are respectively matched with the third bosses (2.5) and the third grooves (2.4) on the adjacent second arc-shaped side plates (2.1); the connecting through holes (2.6) and the vent holes (2.7) are arranged in the same length direction as the inner annular pipe.

5. A method for extracting overlength pile using double casing according to claim 4, characterized in that the outer casing (1) comprises one section of outer annular pipe or at least two sections of outer annular pipes spliced in series along the length direction thereof; the outer annular pipe comprises at least two first arc-shaped side plates (1.1) which are assembled into a ring, a first groove (1.2) and a first boss (1.3) are arranged on the inner wall of each first arc-shaped side plate (1.1), the first boss (1.3) is matched with the second groove (2.2), and the first groove (1.2) is matched with the second boss (2.3); the length directions of the first groove (1.2) and the first boss (1.3) are the same as the length direction of the outer annular pipe;

the end face of the first arc-shaped side plate (1.1) in the circumferential direction is an inclined face, and the inclined faces of two adjacent first arc-shaped side plates are matched.

6. The method for extracting the overlength pile by using the double casing according to claim 4, wherein the connecting piece (3) is a core column, the core column comprises a column body (3.1) and an extraction part (3.2), the column body (3.1) can be arranged through a connecting through hole (2.6) on a multi-section inner annular pipe, and the extraction part (3.2) is arranged at the end part of the column body (3.1); the pull-out part (3.2) is provided with an external thread matched with the nut or the screw cap.

7. The method for pulling out the ultra-long pile by using the double-sleeve according to claim 4, further comprising a hole plug (4), wherein the hole plug (4) is detachably arranged at the vent hole (2.7) and is positioned at the bottom of the pile;

the hole plug (4) comprises a hole plug body (4.1) and a conical body (4.2), the first end of the hole plug body (4.1) can be inserted into the vent hole (2.7) to seal the vent hole, the conical body (4.2) is arranged at the second end of the hole plug body (4.1), and the size of the connecting end to the free end on the conical body (4.2) is gradually reduced.

8. The method for extracting the ultra-long pile by using the double sleeves as claimed in claim 7, wherein the first step is specifically:

communicating vent holes (2.7) among a plurality of sections of inner annular tubes in the inner sleeve (2) and connecting the plurality of sections of inner annular tubes by adopting a connecting piece (3); the adjacent second arc-shaped side plates (2.1) in the inner ring-shaped pipe are welded together through spot welding, the welding spot is 1/5-1/3 of the perimeter of the inner wall of the inner ring-shaped pipe, and a lubricating layer is formed by smearing a lubricating agent on the inner wall surface of the outer sleeve (1); clamping a first groove (1.2) and a first boss (1.3) in an outer sleeve (1) and a second boss (2.3) and a second groove (2.2) in an inner sleeve (2) to ensure that the inner sleeve and the outer sleeve are mutually attached and do not rotate; keeping the ports of the inner sleeve (2) and the outer sleeve (1) flush; the hole plug (4) is arranged at a vent hole (2.7) at the bottom of the inner sleeve (2).

9. The method for pulling out the ultra-long pile by using the double sleeves as claimed in claim 7, wherein the third step is specifically: sinking the double-sleeve pile pulling device by adopting a high-frequency vibration hammer until the bottom end of the double-sleeve pile pulling device is flush with the bottom end of the pile or the bottom end of the residual pile is hammered;

the fifth step is specifically: after the inner sleeve (2), soil and piles inside the inner sleeve are lifted out, the first arc-shaped side plates (1.1) in the outer sleeve (1) are automatically scattered, and all the first arc-shaped side plates (1.1) are taken out.

Technical Field

The invention relates to the technical field of pile foundations, in particular to a method for removing an ultralong pile by adopting a double-sleeve pipe.

Background

With the rapid development of urban construction in recent years, underground space is occupied by a lot of industries and useless construction of piles to be pulled out, and underground engineering excavation is easily blocked, for example, piles of original buildings in a tunnel driving route passing through a region are converged as construction barriers and need to be pulled out.

The stake is driven into underground for a long time after, the extrusion that soil received long-time high strength around the stake, make around the stake soil higher with pile body shear strength, it is even as an organic whole with soil around the stake easily to make, the resistance between stake and the stake soil is greater than the resistance when the stake is just planted into soil far away this moment, to longer stake, the total resistance is greater than the tensile strength of stake easily, adopt ordinary pile pulling mode to be difficult to adapt to longer stake, and present pile pulling mode adopts high pressure water washing stake more, this kind of mode pile pulling mode need with the stake around soil through the whole washing of high pressure squirt, work efficiency is extremely low, it is great to consume the amount of labour.

Disclosure of Invention

The invention aims to disclose a method for removing an ultralong pile by adopting double sleeves, which comprises the following specific scheme:

a method for removing an ultralong pile by adopting a double-sleeve pile pulling device comprises the steps of pulling a pile by adopting the double-sleeve pile pulling device, wherein the double-sleeve pile pulling device comprises an outer sleeve and an inner sleeve which is connected with the outer sleeve in a sliding manner, and the friction coefficient between the contact surface of the outer wall of the inner sleeve and the contact surface of the inner wall of the outer sleeve is smaller than the friction coefficient between the contact surface of the outer wall of the outer sleeve and a soil body (preferably, the friction coefficient between the contact surface of the outer wall of the inner sleeve and the contact surface of the inner wall of the outer sleeve is smaller than the friction coefficient between the contact surface of the outer wall of the outer sleeve and the soil body and the friction coefficient; the inner sleeve comprises a section of inner annular pipe or at least two sections of inner annular pipes which are spliced in series along the length direction of the inner sleeve, and the plurality of sections of inner annular pipes are detachably connected;

the pile pulling process is as follows:

firstly, assembling a double-sleeve pile pulling device;

secondly, moving the double-sleeve pile pulling device to a pile position, and placing a pile head to be pulled in the inner sleeve;

thirdly, sinking the double-casing pile pulling device into the ground;

step four, synchronously lifting the soil body and the pile inside the inner sleeve and the inner sleeve;

fifthly, taking out the outer sleeve;

and sixthly, backfilling pile holes.

Preferably, in the above technical solution, the fourth step specifically includes:

s4.1, connecting the pile head of the pile to be pulled and the upper end of the inner sleeve, and synchronously lifting the inner sleeve and the pile;

s4.2, stopping lifting when the lower end surface of the nth section of inner annular pipe in the inner sleeve pipe is higher than the ground surface, wherein n is more than or equal to 1 and less than or equal to the total number of sections of the inner annular pipe contained in the inner sleeve pipe (n is a natural number);

s4.3, taking out the annular pipes from the first section to the nth section in the inner sleeve;

step S4.4: crushing or cutting off part of the pile;

step S4.5: if the pile is not pulled out, repeating the steps S4.1-S4.4; otherwise, entering the next step;

preferably, in the above technical solution, a lubricating layer is disposed between the inner sleeve and the outer sleeve, so that a friction coefficient between an outer wall contact surface of the inner sleeve and an inner wall contact surface of the outer sleeve is simultaneously smaller than a friction coefficient between the outer wall contact surface of the outer sleeve and a soil body and a friction coefficient between the inner wall contact surface of the inner sleeve and the soil body.

Preferably, in the above technical scheme, the plurality of sections of inner annular tubes are detachably connected through the connecting piece; the inner annular pipe comprises at least two second arc-shaped side plates which are assembled into a ring;

the second arc-shaped side plate is provided with a second groove, a second boss, a third groove, a third boss, a connecting through hole and a vent hole, and the second groove and the second boss are both arranged on the outer wall of the second arc-shaped side plate and used for installing an outer sleeve and limiting the outer sleeve; the third groove and the third boss are arranged at the end part of the second arc-shaped side plate along the circumferential direction of the second arc-shaped side plate, and the third groove and the third boss of one second arc-shaped side plate are respectively matched with the third boss and the third groove on the adjacent second arc-shaped side plate; the connecting through holes and the air holes are arranged in the same length direction with the inner annular pipe.

Preferably, in the above technical solution, the outer sleeve includes a section of outer annular tube or at least two sections of outer annular tubes serially spliced along a length direction thereof; the outer annular pipe comprises at least two first arc-shaped side plates which are assembled into a ring, a first groove and a first boss are arranged on the inner wall of each first arc-shaped side plate, the first boss is matched with the second groove, and the first groove is matched with the second boss; the length directions of the first groove and the first boss are the same as the length direction of the outer annular pipe;

the end faces of the first arc-shaped side plates in the circumferential direction are inclined planes, and the inclined planes of two adjacent first arc-shaped side plates are matched.

Preferably, in the above technical solution, the connecting member is a core column, the core column includes a column body and a pull-out portion, the column body can penetrate through the connecting through hole on the multiple sections of inner annular tubes, and the pull-out portion is disposed at an end of the column body; and the pull-out part is provided with an external thread matched with the nut or the screw cap.

Preferably, the pile further comprises a hole plug, wherein the hole plug is detachably arranged at the vent hole and is positioned at the bottom of the pile;

the hole plug comprises a hole plug body and a conical body, wherein the first end of the hole plug body can be inserted into the vent hole to seal the vent hole, the conical body is arranged at the second end of the hole plug body, and the size of the conical body from the connecting end to the free end is gradually reduced.

Preferably, in the above technical solution, the first step specifically is: communicating vent holes among the multiple sections of inner annular tubes in the inner sleeve and connecting the multiple sections of inner annular tubes by adopting connecting pieces; the adjacent second arc-shaped side plates in the inner annular pipe are welded together through spot welding, the welding spot is 1/5-1/3 of the perimeter of the inner wall of the inner annular pipe, and a lubricating layer is formed by smearing a lubricating agent on the inner wall surface of the outer sleeve; clamping the first groove and the first boss in the outer sleeve and the second boss and the second groove in the inner sleeve to ensure that the inner sleeve and the outer sleeve are attached to each other and do not rotate; keeping the ports of the inner sleeve and the outer sleeve to be arranged in a flush manner; the hole plug is arranged at the vent hole at the bottom of the inner sleeve.

Preferably, in the above technical solution, the third step specifically is: sinking the double-sleeve pile pulling device by adopting a high-frequency vibration hammer until the bottom end of the double-sleeve pile pulling device is flush with the bottom end of the pile or the bottom end of the residual pile is hammered; the fifth step is specifically: when the soil body and the piles inside the inner sleeve and the inner sleeve are lifted out, the first arc-shaped side plates in the outer sleeve are automatically scattered, and all the first arc-shaped side plates are taken out.

The technical scheme of the invention has the following beneficial effects:

1. the method of the invention comprises the following steps: assembling the double-sleeve pile pulling device; adjusting the double-casing pile pulling device to the pile position and sinking the double-casing pile pulling device into the ground (the pile is positioned in the inner casing); synchronously lifting the soil body and the piles inside the inner sleeve and the inner sleeve; taking out the outer sleeve; and (6) backfilling the pile hole. The whole pile pulling process is simplified; the pile pulling device is characterized in that a special double-sleeve pile pulling device is adopted, the inner sleeve and the outer sleeve are connected in a sliding manner, the friction coefficient between the inner sleeve and the outer sleeve is smaller than the friction coefficient between the outer wall surface of the outer sleeve and a soil body, the inner sleeve and the soil body are pulled out together during pile pulling, the friction force between pile soil and the original pile soil during pile pulling is transferred to the friction force between the inner sleeve and the outer sleeve, and the inner sleeve and the outer sleeve are connected in a sliding manner, so that the requirement of mechanical pile pulling force is reduced, and the pile pulling efficiency is greatly; interior sleeve pipe includes that one section inner ring venturi tube or at least two sections inner ring venturi tubes along its length direction series connection concatenation, and the detachable connection of multistage inner ring venturi tube can repeatedly carry out the inside soil body and the stake of sleeve pipe, endotheca in step many times, carries out the segmentation pile pulling, is applicable to pulling out of long stake and overlength stake, and the practicality is strong.

2. In the method, the lubricant is coated between the inner sleeve and the outer sleeve to form a lubricating layer, so that the friction coefficient between the inner sleeve and the outer sleeve is convenient to control, and pile pulling is convenient; interior sheathed tube outer wall contact surface with the lubricant film zero clearance laminating on the outer tube inner wall contact surface, perhaps, lubricant film on the interior sleeve pipe outer wall contact surface with the inner wall contact surface zero clearance laminating of outer tube, when double-pipe pile pulling device was beaten, can not get into earth between outer tube and the interior sleeve pipe, can guarantee better that the coefficient of friction between interior sleeve pipe and the outer tube is less than the coefficient of friction of the outer wall of outer tube and the soil body and the coefficient of friction of interior sheathed tube internal face and the soil body simultaneously, is convenient for pull out the pile.

3. In the method, the outer annular pipe in the outer sleeve comprises a plurality of first arc-shaped side plates, the end surfaces of the first arc-shaped side plates along the circumferential direction are inclined surfaces, and the inclined surfaces of two adjacent first arc-shaped side plates are matched. After the pile and the inner sleeve are pulled out, the outer sleeve automatically scatters and is not kept cylindrical any more, the outer sleeve automatically breaks away from the contact with the soil body, and the outer sleeve is not influenced by the friction force of the soil body when pulled out, so that the pile and the inner sleeve are conveniently pulled out.

4. According to the method, the inner annular pipe in the inner sleeve comprises the plurality of second arc-shaped side plates, and after the inner sleeve and the pile are pulled out, the inner annular pipe positioned outside the ground in the inner sleeve is automatically scattered, so that the inner sleeve is convenient to take out, the inner sleeve does not need to be damaged, and the cyclic utilization of the inner sleeve is realized.

5. In the method, the inner sleeve is provided with the vent hole, so that the negative pressure of a soil body during pile pulling can be effectively reduced; the bottom end of the inner sleeve is inserted with a hole plug which is conical, so that the air vent can be effectively prevented from entering soil during pile pressing; when the pile is pulled out, negative pressure is generated in the soil body, the hole plug is automatically separated from the air vent, the negative pressure of pile soil is reduced, and pile pulling is facilitated.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a top view of a double-casing pile extractor in use according to a preferred embodiment of the present invention;

FIG. 2 is a schematic partial perspective view of the bottom of FIG. 1;

FIG. 3 is a partial schematic view of the first arcuate side plate of FIG. 1;

FIG. 4 is a partial schematic view of the second arcuate side plate of FIG. 1;

fig. 5 is a partial schematic structural view of the stem of fig. 1;

FIG. 6 is a schematic perspective view of the plug of FIG. 2;

FIG. 7 is a flow chart of pile pulling operation in the embodiment;

the connecting structure comprises an outer sleeve, 1.1, a first arc-shaped side plate, 1.2, a first groove, 1.3, a first boss, 1.4, an inclined surface, 2, an inner sleeve, 2.1, a second arc-shaped side plate, 2.2, a second groove, 2.3, a second boss, 2.4, a third groove, 2.5, a third boss, 2.6, a connecting through hole, 2.7, an air vent, 3, a connecting piece, 3.1, a column body, 3.2, a pulling-out part, 4, a hole plug, 4.1, a hole plug body, 4.2, a conical body, 5, a pile head, 6 and a soil body.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.