阅读说明：本技术 一种用于有限空间拔除超长桩的双套管拔桩装置 (Double-sleeve pile pulling device for pulling out ultra-long pile in limited space ) 是由 檀俊坤 乔世范 张细宝 谭新根 许迪 胡青华 谢济仁 胡如成 向南 于 2019-10-30 设计创作，主要内容包括：本发明公开一种用于有限空间拔除超长桩的双套管拔桩装置,包括外套管以及与所述外套管可滑动式连接的内套管,所述内套管的外壁接触面与所述外套管的内壁接触面之间的摩擦系数小于所述外套管的外壁接触面与土体的摩擦系数。应用本发明的双套管拔桩装置,效果是：装置结构精简；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,实用性强。(The invention discloses a double-sleeve pile pulling device for pulling out an ultra-long pile in a limited space, which comprises an outer sleeve and an inner sleeve connected with the outer sleeve in a sliding manner, wherein 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. The double-sleeve pile pulling device has the effects that: the device structure is simplified; outer tube and interior sleeve pipe slidable formula are connected, 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, when pulling out the stake, interior sleeve pipe and soil body are pulled out 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 out, reduces the tensile requirement of mechanical pile pulling force, can improve pile pulling efficiency greatly, and the practicality is strong.)

1. The utility model provides a double cannula pulls out stake device for having limited space pulls out overlength stake which characterized in that, including outer tube (1) and with interior sleeve pipe (2) of outer tube (1) slidable connection, the outer wall contact surface of interior sleeve pipe (2) with coefficient of friction between the inner wall contact surface of outer tube (1) is less than the coefficient of friction of the outer wall contact surface of outer tube and the soil body.

2. The double-sleeve pile pulling device for pulling out the ultra-long pile in the limited space according to claim 1, wherein a lubricating layer is arranged between the inner sleeve (2) and the outer sleeve (1), so that the friction coefficient between the outer wall contact surface of the inner sleeve (2) and the inner wall contact surface of the outer sleeve (1) is simultaneously smaller than the friction coefficient between the outer wall contact surface of the outer sleeve and the soil body and the friction coefficient between the inner wall contact surface of the inner sleeve and the soil body.

3. The double-sleeve pile pulling device for pulling out the ultra-long pile in the limited space according to claim 1, wherein the contact surface of the inner wall of the outer sleeve (1) and the contact surface of the outer wall of the inner sleeve (2) are smooth contact surfaces; the outer sleeve (1) and the inner sleeve (2) are both steel sleeves.

4. Double-casing pile pulling device for limited-space pile pulling out of ultra-long pile according to claim 1, characterized in that the length of the inner casing (2) is equal to the length of the outer casing (1), and the end surface of the inner casing (2) is flush with the end surface of the outer casing (1).

5. The double-sleeve pile pulling device for pulling out the ultra-long pile in the limited space according to claim 1, wherein the contact surface of the outer wall of the inner sleeve (2) is in gapless fit with the lubricating layer on the contact surface of the inner wall of the outer sleeve (1);

or the lubricating layer on the contact surface of the outer wall of the inner sleeve (2) is attached to the contact surface of the inner wall of the outer sleeve (1) without a gap.

6. Double-casing pile extractor device for limited-space extraction of ultra-long piles according to any of claims 1-5, 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 its length; 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) which are used for mounting the inner sleeve (2) and limiting the inner sleeve (2) are arranged on the inner wall of each 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, and the inclined faces of two adjacent first arc-shaped side plates are matched.

7. The double-casing pile pulling device for pulling out the ultra-long pile in the limited space according to claim 6, wherein the inner casing (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 casing, and the sections of inner annular pipes are detachably connected through a 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 an air vent (2.7) are arranged on the second arc-shaped side plate (2.1), 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), 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 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.

8. Double-casing pile pulling device for limited-space pile pulling out of ultra-long piles according to claim 6, characterized in that the connecting piece (3) is a stem, the stem comprises a cylinder body (3.1) and a pulling-out portion (3.2), the cylinder body (3.1) can be arranged through the connecting through hole (2.6) of the multi-section inner annular pipe, the pulling-out portion (3.2) is arranged at the end of the cylinder body (3.1); the pull-out part (3.2) is provided with an external thread matched with the nut or the screw cap.

9. Double-casing pile pulling device for limited-space pile pulling out of very long piles according to claim 6, further comprising a hole plug (4), wherein the hole plug (4) is detachably arranged at the vent hole (2.7) and is located at the bottom of the pile.

10. Double-casing pile pulling device for limited-space pile pulling out of very long piles according to claim 9, characterized in that the hole plug (4) comprises a plug body (4.1) and a cone (4.2), the first end of the plug body (4.1) can be inserted into the venthole (2.7) to seal the venthole, the cone (4.2) is arranged at the second end of the plug body (4.1), and the size of the cone (4.2) is gradually reduced from the connecting end to the free end.

Technical Field

The invention relates to the technical field of pile foundations, in particular to a double-sleeve pile pulling device for pulling out an ultra-long pile in a limited space.

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 double-sleeve pile pulling device for pulling out an ultra-long pile in a limited space, which has a simple structure, is convenient for pile pulling, is particularly suitable for pulling out the ultra-long pile, and has the following specific scheme:

the utility model provides a double cannula pulls out stake device for having limited space pulls out overlength stake, including the outer tube and with interior sleeve pipe of outer tube slidable connection, interior sheathed tube outer wall contact surface with coefficient of friction between the inner wall contact surface of outer tube is less than the coefficient of friction of the outer wall contact surface of outer tube and the soil body.

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 solution, the contact surface of the inner wall of the outer sleeve and the contact surface of the outer wall of the inner sleeve are both smooth contact surfaces; the outer sleeve and the inner sleeve are both steel sleeves.

Preferably, in the above technical solution, the length of the inner sleeve is equal to the length of the outer sleeve, and the end surface of the inner sleeve is flush with the end surface of the outer sleeve.

Preferably, in the above technical scheme, the contact surface of the outer wall of the inner sleeve is in gapless fit with the lubricating layer on the contact surface of the inner wall of the outer sleeve;

or the lubricating layer on the contact surface of the outer wall of the inner sleeve is in gapless fit with the contact surface of the inner wall of the outer sleeve.

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 which are used for installing an inner sleeve and limiting the inner sleeve are arranged on the inner wall of each first arc-shaped side plate, and 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 inner casing comprises a section of inner annular pipe or at least two sections of inner annular pipes spliced in series along the length direction thereof, and the plurality of sections of inner annular pipes are detachably connected by a connecting piece; the inner annular pipe comprises at least two second arc-shaped side plates which are assembled into a ring;

a second groove, a second boss, a third groove, a third boss, a connecting through hole and a vent hole are formed in the second arc-shaped side plate, the second groove and the second boss are both arranged on the outer wall of the second arc-shaped side plate, the second groove is matched with the first boss, and the second boss is matched with the first groove; 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 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, still include the hole stopper among the above technical scheme, the hole stopper detachable setting is in venthole department, and be located the pile bottom position.

Preferred among the above technical scheme, the stopple includes stopple body and conical body, the first end of stopple body can insert seal the air vent in the air vent, the conical body sets up the second end of stopple body, and by link to free end size diminish gradually on the conical body.

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

1. the double-sleeve pile pulling device is provided with the inner sleeve and the outer sleeve and is of a double-sleeve structure, and 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 whole structure is simple; when the pile is pulled out, the inner sleeve and the soil body are pulled out together, the friction force between pile soil during the original 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, the pile pulling efficiency can be improved, and the occurrence of pile breakage can be reduced; a lubricating agent 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.

2. The outer sleeve comprises an outer annular pipe or at least two outer annular pipes which are spliced in series along the length direction of the outer sleeve, the inner sleeve comprises an inner annular pipe or at least two inner annular pipes which are spliced in series along the length direction of the inner sleeve, and the inner annular pipes are detachably connected through a connecting piece. The outer sleeve and the inner sleeve can be set into single-section or multi-section inner annular tubes, and pile pulling requirements of piles with different lengths are met.

3. 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 planes, and the inclined planes 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. According to the invention, the inner sleeve in the inner sleeve comprises the plurality of second arc-shaped side plates, and when the inner sleeve and the pile are pulled out simultaneously, the pile is broken without damaging the inner sleeve, so that the inner sleeve can be recycled conveniently.

4. According to the invention, 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.

5. In the double-sleeve pile pulling device, the first boss and the first groove on the outer sleeve are matched with the second groove and the second boss on the inner sleeve, so that slidable connection between the outer sleeve and the inner sleeve can be realized, relative rotation between the outer sleeve and the inner sleeve can be prevented, the inner sleeve and the outer sleeve are tightly attached, and pile pulling is facilitated.

The pile pulling method is convenient to operate; the pile can be quickly pulled out, the construction efficiency can be greatly improved, and the requirement on the pulling force of pile pulling equipment is reduced.

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;

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.