CN111648413A

CN111648413A - Pile foundation anti-freezing and pulling device

Info

Publication number: CN111648413A
Application number: CN202010524953.3A
Authority: CN
Inventors: 王永涛; 闫一辉; 徐湘田; 毕佳俊; 贾寒; 黄文斌; 邵帅
Original assignee: Inner Mongolia University
Current assignee: Inner Mongolia University
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2020-09-11
Anticipated expiration: 2040-06-10
Also published as: CN111648413B

Abstract

The invention discloses a pile foundation anti-freezing pulling device which comprises a base and a stabilizing cylinder vertically fixed on the top surface of the base; the base is vertically provided with two limiting rods which are uniformly distributed along the circumferential direction of the stabilizing barrel in a penetrating and fixing mode, the middle of the movable plate is provided with a sliding sleeve which is coaxially arranged with the stabilizing barrel in a penetrating and fixing mode, and the bottom end of the sliding sleeve is in movable contact with the top end of the stabilizing barrel. The advantages are that: the stabilizing cylinder ensures the stability of the bottom end of the pile foundation, and the base is embedded in the frozen soil layer to ensure the stability of the whole structure; when the freeze thawing circulation of the movable layer occurs, the sliding sleeve is subjected to upward freeze pulling force of frozen soil, the sliding sleeve drives the movable plate to move upwards, the frozen soil above the movable plate can provide reverse resistance for the movable plate to block upward movement, and the freeze pulling effect is weakened.

Description

Pile foundation anti-freezing and pulling device

The technical field is as follows:

the invention relates to the technical field of pile engineering, in particular to a pile foundation anti-freezing pulling device.

Background art:

the permafrost area of China is about 22 percent of the area of the national soil, especially in the northeast region, the permafrost is widely distributed, and because of the regionality and high water-bearing property of the distribution of the permafrost, severe frost damage problems such as frost heaving, thawing sinking, freezing and pulling and the like occur in highway engineering, oil transportation engineering and electric power pile engineering in China; the pile column in the frozen soil area can be subjected to frost heaving force generated by deformation and uplift of the soil body, the pile column part arranged under the stratum directly acts with the soil body, and unequal displacement of the bottom of the pile column easily causes the pile column to be frozen and pulled in the frost heaving and thawing process of the soil body, so that the pile column can be toppled to bring engineering damage.

In order to prevent the inclination of the pile, the depth of the buried soil is usually increased, but because the contact area between the pile and the stratum is small and the tangential freeze-pull force is too large, even if the depth of the buried soil is deep into a frozen soil layer, the pile still cannot be prevented from being pulled up and toppled over under the freeze-thaw cycle action of the frozen soil in the use process, so that serious engineering damage is caused, and a large amount of manpower and material resources are consumed for recovery.

The invention content is as follows:

the invention aims to provide a pile foundation anti-freezing pulling device which effectively prevents frozen soil from damaging a pile foundation so as to prevent a pile from toppling.

The invention is implemented by the following technical scheme: a pile foundation anti-freezing pulling device comprises a base and a stabilizing cylinder vertically fixed on the top surface of the base; more than two limiting rods which are uniformly distributed along the circumferential direction of the stabilizing cylinder are vertically and fixedly arranged on the base in a penetrating manner, and a movable plate which is arranged in an up-and-down moving manner is arranged between the top ends of the limiting rods in a penetrating manner; the middle part of fly leaf wear to establish be fixed with one with stabilize a coaxial sliding sleeve that sets up of section of thick bamboo, the bottom of sliding sleeve with the top movable contact who stabilizes a section of thick bamboo.

Furthermore, the sliding sleeve inner wall is fixed with more than two sliding rails along the axial embedding, each the sliding rail is followed sliding sleeve circumference evenly arranges the setting, every the sliding rail dorsad the outside embedding of sliding sleeve has the ball of a plurality of vertical arranging.

Furthermore, the top end of the stabilizing cylinder is provided with a plurality of sliding chutes which extend downwards along the axial direction, and the sliding chutes are uniformly distributed along the circumferential direction of the stabilizing cylinder; the bottom end of the sliding sleeve is fixedly provided with a plurality of guide bars which are inserted into the corresponding sliding grooves.

The invention has the advantages that: when the pile foundation and the pile foundation are subjected to landfill construction, the base is embedded in the frozen soil layer, the stability of the whole structure is ensured, and the bottom end of the pile foundation is slidably arranged in the stabilizing cylinder in a penetrating manner, so that the stability of the bottom end of the pile foundation can be ensured; when the freeze-thaw cycle of the movable layer occurs, the sliding sleeve is subjected to upward tangential freeze-pull force exerted by frozen soil, and the sliding sleeve drives the movable plate to move upwards, the frozen soil above the movable plate can provide reverse resistance to the movable plate to prevent the movable plate from moving upwards, so that the freeze-pull effect can be weakened, and the phenomenon that the pile foundation is frozen and pulled due to the fact that the pile foundation is in direct contact with the movable layer is avoided by the sliding sleeve.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a view taken along direction a of fig. 1.

Fig. 3 is a sectional view B-B of fig. 1.

Fig. 4 is a partial enlarged view of C of fig. 1.

FIG. 5 is a schematic view of the structure of the sliding sleeve of the present invention after freezing and pulling.

The parts in the drawings are numbered as follows: the device comprises a base 1, a stabilizing cylinder 2, a sliding groove 2.1, a pile foundation 3, a sliding sleeve 4, a movable plate 5, a limiting rod 6, a sliding rail 7, a ball 8, a guide bar 9, an infrared ray correlation alarm 10, a ground 11, a movable layer 12 and a frozen soil layer 13.

The specific implementation mode is as follows:

as shown in fig. 1 to 5, a pile foundation anti-freeze pulling device comprises a base 1 and a stabilizing cylinder 2 vertically fixed on the top surface of the base 1; more than two limiting rods 6 which are uniformly distributed along the circumferential direction of the stabilizing cylinder 2 are vertically and fixedly arranged on the base 1 in a penetrating manner, and the two limiting rods 6 are symmetrically arranged relative to the stabilizing cylinder 2 in the embodiment; a movable plate 5 which moves up and down is arranged between the top ends of the limiting rods 6 in a penetrating way, and the movable plate 5 is horizontally arranged; a sliding sleeve 4 coaxially arranged with the stabilizing cylinder 2 is fixedly arranged in the middle of the movable plate 5 in a penetrating manner, the bottom end of the sliding sleeve 4 is movably contacted with the top end of the stabilizing cylinder 2, and in the embodiment, the movable plate 5 is fixed with the sliding sleeve 4 in a threaded manner; the bottom end of the limiting rod 6 is conical, so that the limiting rod can penetrate into the frozen soil layer 13 conveniently, and the whole structure is more stable; the movable layer 12 can be frozen and expanded in winter and can be thawed and sunk in summer, namely the freeze-thaw cycle of the movable layer 12 has large influence on the pile foundation 3, the frozen soil layer 13 is always below 0 ℃ and is always in a relatively stable state, and the influence of the frozen soil layer 13 on the pile foundation 3 is small relative to the movable layer 12, so that when the pile foundation 3 is subjected to landfill construction, the base 1 is embedded in the frozen soil layer 13, and the stability of the whole structure can be ensured; the bottom end of the pile foundation 3 is slidably inserted into the sliding sleeve 4 and then placed in the stabilizing cylinder 2, the stability of the bottom end of the pile foundation 3 can be guaranteed through the stabilizing cylinder 2, the stabilizing cylinder 2 is made of EPS or XPS hard heat insulation plates, a good heat insulation effect is achieved on the bottom of the pile foundation 3, and the frozen soil is prevented from being melted due to the influence of the pile foundation 3; the movable plate 5 is arranged in the movable layer 12 below the ground 11, when the movable layer 12 undergoes freeze thawing circulation, the sliding sleeve 4 is subjected to upward tangential freeze-pulling force exerted by frozen soil, the movable plate 5 is driven by the sliding sleeve 4 to move upwards under the guidance of the limiting rod 6, the frozen soil above the movable plate 5 can provide reverse resistance for the movable plate 5 to block the movable plate 5 from moving upwards, the effect of weakening freeze-pulling can be achieved, and the pile foundation 3 is prevented from being frozen and pulled out due to the fact that the pile foundation 3 is prevented from being in direct contact with the movable layer 12 through the sliding sleeve 4, so that damage to the pile foundation 3 caused by the frozen soil can be avoided, the pile foundation 3 is effectively prevented from being pulled out and toppled over, and engineering accidents are avoided; be equipped with infrared ray correlation alarm 10 on ground 11, when sliding sleeve 4 appears freezing and drawing, drive fly leaf 5 and shift out to a certain position on ground 11, infrared ray correlation alarm 10 sends alarm signal teletransmission to alarm host computer after detecting fly leaf 5, reminds the staff, and the staff of being convenient for pushes down fly leaf 5 in summer, makes sliding sleeve 4 resume initial position.

More than two sliding rails 7 are embedded and fixed on the inner wall of the sliding sleeve 4 along the axial direction, and in the embodiment, the two sliding rails 7 are symmetrically arranged; the sliding rails 7 are uniformly distributed along the circumferential direction of the sliding sleeve 4, a plurality of longitudinally distributed balls 8 are embedded in the outer side, opposite to the sliding sleeve 4, of each sliding rail 7, the balls 8 are in rolling contact with the pile foundation 3, and the sliding rails 7 with the balls 8 are arranged, so that the friction force between the sliding sleeve 4 and the pile foundation 3 can be reduced, the pile foundation 3 is prevented from being driven to move upwards in the upward movement process of the sliding sleeve 4, and the pile foundation 3 is ensured to be more stable; the top end of the stabilizing cylinder 2 is provided with a plurality of sliding chutes 2.1 which extend downwards along the axial direction, and the sliding chutes 2.1 are uniformly distributed along the circumferential direction of the stabilizing cylinder 2; a plurality of guide strips 9 inserted into the corresponding sliding grooves 2.1 are fixed at the bottom end of the sliding sleeve 4, the sliding sleeve 4 is tightly combined with the stable cylinder 2 through the matching of the guide strips 9 and the sliding grooves 2.1, and when the sliding sleeve 4 has a freezing and pulling phenomenon, the effect of weakening the freezing and pulling can be further achieved through the friction force between the guide strips 9 and the sliding grooves 2.1; each spout 2.1 size is the same, and evenly arranges the setting along the circumference of a firm section of thick bamboo 2, after sliding sleeve 4 appears freezing and pulls out the phenomenon, the bottom of pile foundation 3 along circumference and frozen soil even contact, guarantees that 3 bottom atress on the pile foundation are even, is favorable to guaranteeing that pile foundation 3 is more firm.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The pile foundation anti-freezing pulling device is characterized by comprising a base and a stabilizing cylinder vertically fixed on the top surface of the base; more than two limiting rods which are uniformly distributed along the circumferential direction of the stabilizing cylinder are vertically and fixedly arranged on the base in a penetrating manner, and a movable plate which is arranged in an up-and-down moving manner is arranged between the top ends of the limiting rods in a penetrating manner; the middle part of fly leaf wear to establish be fixed with one with stabilize a coaxial sliding sleeve that sets up of section of thick bamboo, the bottom of sliding sleeve with the top movable contact who stabilizes a section of thick bamboo.

2. The pile foundation anti-freezing pulling device according to claim 1, wherein more than two sliding rails are embedded and fixed in the inner wall of the sliding sleeve along the axial direction, the sliding rails are evenly arranged along the circumferential direction of the sliding sleeve, and a plurality of longitudinally arranged balls are embedded in the outer side of each sliding rail, which faces away from the sliding sleeve.

3. The pile foundation anti-freezing pulling device according to claim 1 or 2, wherein a plurality of sliding grooves extending downwards along the axial direction are formed at the top end of the stabilizing cylinder, and the sliding grooves are uniformly distributed along the circumferential direction of the stabilizing cylinder; the bottom end of the sliding sleeve is fixedly provided with a plurality of guide bars which are inserted into the corresponding sliding grooves.