CN110747855B - Method for removing ultra-long pile by adopting double sleeves - Google Patents
Method for removing ultra-long pile by adopting double sleeves Download PDFInfo
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- CN110747855B CN110747855B CN201911046985.0A CN201911046985A CN110747855B CN 110747855 B CN110747855 B CN 110747855B CN 201911046985 A CN201911046985 A CN 201911046985A CN 110747855 B CN110747855 B CN 110747855B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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Abstract
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.
Description
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.
Example (b):
a method for removing super-long pile by using double sleeves adopts a double-sleeve pile pulling device which comprises an outer sleeve 1 and an inner sleeve 2, and is shown in detail in figures 1-6, and the details are as follows:
the inner wall surface of the outer sleeve 1 and the outer wall surface of the inner sleeve 2 are both smooth contact surfaces, and particularly, the contact part of the inner wall surface of the outer sleeve and the outer avoidance surface of the inner sleeve is a smooth surface. The outer sleeve and the inner sleeve are both made of steel.
A lubricating layer is arranged between the inner sleeve 2 and the outer sleeve 1, and the lubricating layer is a lubricating agent layer (such as butter and the like) with a certain thickness coated on the inner wall of the outer sleeve, so that the friction coefficient between the inner sleeve 2 and the outer sleeve 1 is simultaneously smaller than the friction coefficient between the outer wall surface of the outer sleeve and the soil mass and the friction coefficient between the inner wall surface of the inner sleeve and the soil mass.
The outer sleeve 1 comprises an outer annular pipe or at least two outer annular pipes which are spliced in series along the length direction of the outer annular pipe, the outer annular pipe comprises at least two first arc-shaped side plates 1.1 which are spliced into a ring shape, in detail, fig. 1 (disclosing four first arc-shaped side plates) and fig. 3, a first groove 1.2 and a first boss 1.3 are arranged on the inner wall of the first arc-shaped side plate 1.1, and 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 1.4, and the inclined faces of two adjacent first arc-shaped side plates are matched. I.e. the end surface of the first curved side plate 1.1 in its circumferential direction forms a non-zero angle (preferably an angle of 10-75 deg.) with the tangent thereto.
The inner sleeve 2 comprises one section of inner ring-shaped pipe or at least two sections of inner ring-shaped pipes which are spliced in series along the length direction of the inner ring-shaped pipe, and the plurality of sections of inner ring-shaped pipes are detachably connected through 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, and is shown in detail in fig. 1 (four second arc-shaped side plates are disclosed) and fig. 4, 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 arranged on each second arc-shaped side plate 2.1, the second groove 2.2 and the second boss 2.3 are arranged on the outer wall of each second arc-shaped side plate 2.1, the second groove 2.2 is matched with the first boss 1.3, and the second boss 2.3 is matched with the first groove 1.2; 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 plate 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. The end surfaces of the second arc-shaped side plates 2.1 in the circumferential direction are inclined planes or planes, and the inclined planes or planes of two adjacent second arc-shaped side plates are matched.
Preferably, the connecting piece 3 is a core column, the core column comprises a column body 3.1 and a pulling-out part 3.2, as shown in fig. 5 in detail, the column body 3.1 can be arranged through a connecting through hole 2.6 on a plurality of sections of inner annular tubes, and the pulling-out 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.
Preferably, the pile further comprises 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, and is shown in detail in fig. 6, a first end of the hole plug body 4.1 can be inserted into the vent hole 2.7 to seal the vent hole (specifically, the bottom of the vent hole is inserted to prevent the vent hole from entering the soil), the conical body 4.2 is arranged at a second end of the hole plug body 4.1, and the size of the conical body 4.2 from a connecting end to a free end is gradually reduced, specifically, the conical body is of a conical structure.
The double-casing pile pulling device of the embodiment is applied to pile pulling, and the concrete pile pulling process is shown in fig. 7 in detail as follows:
the first step, dress double cannula pile pulling device specifically is: communicating vent holes 2.7 among a plurality of sections of inner annular pipes in the inner sleeve 2, welding adjacent second arc-shaped side plates 2.1 in the inner annular pipes together through spot welding, wherein the welding spot is 1/5-1/3 (preferably 1/3) of the perimeter of the inner wall of the inner annular pipe, and smearing a lubricant on the inner wall surface of the outer sleeve 1 to form a lubricating layer; clamping a first groove 1.2 and a first boss 1.3 in the outer sleeve 1 with a second boss 2.3 and a second groove 2.2 in the inner sleeve 2, and keeping the ports of the inner sleeve 2 and the outer sleeve 1 to be arranged in a flush manner; the hole plugs 4 are arranged at the vent holes 2.7 at the bottom of the inner sleeve 2. The second boss 2.3 can be a T-shaped boss, and the first groove 1.2 is a T-shaped groove matched with the T-shaped boss. After the first groove 1.2 and the first boss 1.3 in the outer sleeve 1 are clamped with the second boss 2.3 and the second groove 2.2 in the inner sleeve 2, the outer sleeve 1 and the inner sleeve 2 are attached without a gap, and the outer sleeve 1 and the inner sleeve 2 cannot rotate relatively. The shape specification of the first recess 1.2, the first boss 1.3, the second boss 2.3 and the second recess 2.2 can be designed according to the actual situation.
And secondly, adjusting the double-sleeve pile pulling device to a long pile position by adopting lifting equipment, and placing the pile head in an inner sleeve 2 of the double-sleeve pile pulling device.
Thirdly, sinking the double-casing pipe pile pulling device with the pile head into the ground by adopting a hammering mode, which specifically comprises the following steps: 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; soil 6 is filled between the double-casing pile pulling device and the pile.
And fourthly, synchronously lifting the inner sleeve 2, the soil body in the inner sleeve and the pile head by adopting hoisting equipment, and comprising the following steps of:
s4.1, locking the pile head by adopting a pile extractor, connecting the upper end of the inner sleeve, and synchronously lifting the inner sleeve and the pile body;
s4.2, stopping lifting when the second section of inner ring-shaped pipe in the inner sleeve is higher than the ground surface, connecting the second section of inner ring-shaped pipe with the core column by adopting a screw cap or a nut, and lifting the screw cap to lift the core column;
s4.3, after all the core columns are taken out, taking out the second arc-shaped side plate 2.1 in the inner sleeve 2;
s4.4: clearing away the pile body soil body;
s4.5: locking the pile hoisting equipment and the pile exposed out of the ground to prevent the pile from sliding downwards;
s4.6: crushing or cutting off the upper part of the locking pile, and locking the pile extractor and the pile;
s4.7: if the pile is not pulled out, repeating the steps S4.1-S4.6; otherwise, go to the next step.
Step five, an outer sleeve 1 is provided, which specifically comprises the following steps: when the inner sleeve 2 is completely pulled out and completely separated from the outer sleeve 1, the outer sleeve is not restrained by the level and the circumference, and because the inclined planes are arranged on the two sides of the first arc-shaped side plates, the adjacent first arc-shaped side plates are not closed into a ring shape any more, and are separated from the friction of a soil body, and the first arc-shaped side plates 1.1 in the outer sleeve 1 are hoisted successively.
And sixthly, backfilling pile holes.
During specific application, the outer sleeve 1 and the inner sleeve 2 with different lengths or diameters can be designed according to requirements, and the number of the first arc-shaped side plates and the number of the second arc-shaped side plates can be selected according to actual requirements.
By applying the technical scheme of the embodiment, the double-sleeve pile pulling device is simple in structure, convenient for pile pulling operation and greatly improved in pile pulling efficiency; when the overlength stake is pulled out, the outer tube can be taken out in a sectional manner, the inner tube does not need to be damaged, and the repeated utilization rate of the inner tube is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
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 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 hole (2.6) and the vent hole (2.7) are arranged in the same length direction as the inner annular pipe;
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. A method for extracting an overlength pile using a double casing according to claim 3, wherein the inner annular pipes are detachably connected by means of a connecting member (3).
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 is deeper than the bottom end of the pile, and stopping hammering;
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.
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| CN111424666B (en) * | 2020-03-26 | 2022-06-14 | 张永刚 | Pile pulling device for shield construction crossing area |
| WO2022116916A1 (en) * | 2020-12-01 | 2022-06-09 | 中交第三航务工程局有限公司 | Construction method for pulling out concrete pipe pile on water and pile pulling-out tool |
| CN112900435A (en) * | 2020-12-01 | 2021-06-04 | 中交第三航务工程局有限公司 | Construction method for pulling out concrete pipe pile on water |
| CN115075249A (en) * | 2022-07-12 | 2022-09-20 | 中铁一局集团有限公司 | Pile foundation clearing device and pile foundation clearing process |
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| JP2004162301A (en) * | 2002-11-11 | 2004-06-10 | Nippon Sharyo Seizo Kaisha Ltd | Method and apparatus for removing existing pile |
| JP2009256999A (en) * | 2008-04-18 | 2009-11-05 | Nippon Concrete Ind Co Ltd | Pile extracting construction method for existing hollow pile |
| CN204298821U (en) * | 2014-11-17 | 2015-04-29 | 天津市勘察院 | Two sleeve pile pulling device |
| CN104652436B (en) * | 2014-12-24 | 2017-06-27 | 福建工程学院 | Steel sleeve high pressure water injection is loosened the soil pile-pulling construction method |
| CN205975711U (en) * | 2016-07-19 | 2017-02-22 | 中建一局集团建设发展有限公司 | Two sleeves of high -efficient drag reduction of resistance to compression testing pile and testing pile system thereof |
| CN107190762B (en) * | 2017-07-11 | 2023-05-16 | 中铁第四勘察设计院集团有限公司 | Pile foundation structure for reducing side friction resistance |
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