CN213805337U

CN213805337U - Stretching type concrete precast pile suitable for soft foundation

Info

Publication number: CN213805337U
Application number: CN202022516021.2U
Authority: CN
Inventors: 李文强; 张通; 朱家毅
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-07-27
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a be applicable to soft ground extension formula concrete precast pile, it includes pile body, pile point, steel reinforcement framework and extension device to constitute its characterized in that, and the pile body cross-section is "four corners star", and pile body and pile point are integrated into one piece, and the pile point is solid concrete, and steel reinforcement framework settles inside the pile body, extension device comprises gas-filled duct, prism, expansion hose, gear and spring plectrum, gas-filled duct is along the vertical arrangement of pile body, and the upper end opening, is close to the pile point and seals, expansion hose links to each other with gas-filled duct, and the prism links to each other with expansion hose, and the prism can stretch out the pile body and insert the soil body, and it is rotatory that the gear is driven when the prism extends, and the elasticity plectrum card is on the gear, makes it can only follow a direction and rotate, pours into grout into after the extension is accomplished. The pile has the structure, so that the interaction force between the pile and soil can be effectively increased, the settlement of a pile foundation is effectively reduced, the soil squeezing effect is reduced, and the pile driving is facilitated.

Description

Stretching type concrete precast pile suitable for soft foundation

Technical Field

The utility model relates to a construction field, more specifically relates to be applicable to soft ground stretching type precast concrete pile.

Background

The weak foundation geological conditions are poor, and the foundation bearing capacity is less, need use the pile foundation, all squeeze into the underground with each stake, if the precast pile can not be stable firm in the weak foundation, will unable improvement foundation bearing capacity.

At present, a cylindrical concrete precast pile or a square concrete precast pile is usually used in a soft foundation, the shapes or the sizes of all sections of the pile are the same, the settlement deformation in the soft foundation is large, the effects of the bearing capacity of the foundation and the uplift resistance of a pile body are poor, the soil squeezing effect can be generated in the foundation in the piling process, and the pile body is not easy to be driven into the ground.

Disclosure of Invention

An object of the utility model is to above problem, a be applicable to soft foundation extension formula concrete precast pile is provided, the pile body cross-section of this stake is "four corners star", the stake point is the toper, resistance when greatly reduced drives the pile, insert in the soil back, the extending structure can extend the soil body on every side, this kind of structure that this kind of stake has, can effectually increase the interact power between stake and the soil, produce the synergism with the soil layer on every side, the effectual settlement that reduces the pile foundation, reduce crowded soil effect, increase pile foundation resistance to plucking ability and ground bearing capacity.

In order to achieve the purpose, the experiment novel provides the following technical scheme that the extension type concrete precast pile suitable for the soft foundation is composed of a pile body, a pile tip, a steel reinforcement framework and an extension device, the section of the pile body is a 'quadrangle star', the pile body and the pile tip are integrally formed by pouring, the pile tip is made of solid concrete, the steel bar framework is arranged inside the pile body, the stretching device consists of a gear, an elastic shifting sheet, an inflation pipeline, a flexible hose and a prism, the inflation pipeline is vertically arranged along the pile body, the upper end of the triangular prism is open and closed close to the tip of the pile, the flexible hose is connected with the inflation pipeline, the triangular prism is connected with the flexible hose, the prism can stretch out the pile body and insert the soil body, the prism is driven to rotate when being stretched, and the elastic shifting piece is clamped on the gear, so that the elastic shifting piece can only rotate along one direction.

Further, the triangular prism has a gear pattern.

Furthermore, lubricating oil is smeared between the triangular prism and the gear.

Further, the prism is along cross-sectional symmetry arrangement, evenly arranges along pile body cross-section, arranges the distance and is not more than 1/3 pile body length.

Furthermore, the strength of the concrete used by the pile tip is higher than that of the concrete used by the pile body.

The utility model discloses beneficial effect that can produce: the cross section of the pile body of the utility model is a four-corner star, which can reduce the consumption of concrete and the cost of engineering; the middle part of the prefabricated pile is provided with the inflatable pipeline, so that the pile forming quality of the prefabricated pile can be reduced, and the power consumption in transportation and hoisting is reduced; the section of the pile body is a four-pointed star, the pile tip is conical, the resistance in piling is greatly reduced, the pile can be driven into the ground by applying smaller pressure by the pile driver, the abrasion degree of the pile driver is reduced, and the pile sinking efficiency is obviously improved; the structure that this kind of stake had can effectively reduce crowded soil effect, and the prism that stretches out through extension device can the effectual interact power that increases between stake and the soil, produces the synergism with surrounding soil layer, and the effectual settlement that reduces the pile foundation improves stake body resistance to plucking ability and ground bearing capacity.

Drawings

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

FIG. 2 is a plan view of the pile body when the structure of the present invention is not extended

FIG. 3 is a schematic diagram of the extended configuration labeled: 1-pile body, 2-pile tip, 3-inflation pipeline, 4-prism, 5-flexible hose, 6-gear, 7-elastic shifting piece and 8-steel reinforcement framework.

Detailed Description

The invention will be further elucidated with reference to the drawings in an embodiment of the invention.

As shown in fig. 1 and 3, for the utility model discloses a flexible concrete precast pile suitable for soft foundation, which comprises a pile body (1), a pile tip (2), a steel reinforcement framework (8) and a stretching device, wherein the cross section of the pile body (1) is a 'quadrangle star', the pile body (1) and the pile tip (2) are integrally formed, the pile tip (2) is solid concrete, the steel reinforcement framework (8) is arranged inside the pile body (1), the stretching device is composed of an inflation pipeline (3), a prism (4), a flexible hose (5), a gear (6) and an elastic shifting sheet (7), the inflation pipeline (3) is vertically arranged along the pile body (1), the upper end of the inflation pipeline is opened and closed near the end of the pile tip (2), the flexible hose (5) is connected with the inflation pipeline (3), the prism (4) is connected with the flexible hose (5), the triangular prism (4) can stretch out the pile body (1) and be inserted into the soil body, the triangular prism (4) drives the gear (6) to rotate when being stretched, and the elastic shifting piece (7) is clamped on the gear, so that the elastic shifting piece can only rotate along one direction.

When the utility model is used, according to the construction demand, confirm the length of pile body (1), gas-filled pipeline (3) to and prism (4), expansion hose (5), gear (6), elasticity plectrum (6) number, prism (4) interval arrangement distance is not more than the third of pile body (1) length, paints lubricating oil between prism (4), gear (6) and pile body (1), arranges framework of steel reinforcement (8), the one-shot forming. The position of a definite pile is determined by paying off, the pile is suspended in the middle of the pile position, a pile driver is started, a precast pile is driven into the ground, after a preset depth is reached, an inflation pipeline (1) is connected with a high-pressure air pump, high-pressure air is filled into the inflation pipeline, the triangular body (4) is extended to a soil body after being pressurized, the gear (6) is driven to rotate when the triangular body (4) is extended, the elastic shifting piece (7) is clamped on the gear (6) and can only rotate along one direction, the pressure is continuously stabilized for about half an hour, and the triangular body (4) is ensured to completely extend into the soil body. And the inflation pipeline (3) and the flexible hose (5) are filled with cement slurry in a reverse slurry mode, and watering maintenance is regularly performed after initial setting.

Claims

1. The utility model provides a be applicable to soft ground extension formula concrete precast pile, it includes pile body (1), pile tip (2), steel reinforcement framework (8) and extension fixture its characterized in that, pile body (1) cross-section is "four-pointed star", pile body (1) and pile tip (2) are integrated into one piece, pile tip (2) are solid concrete, inside steel reinforcement framework (8) were settled in pile body (1), extension fixture comprises gas-filled duct (3), prism (4), expansion hose (5), gear (6) and elasticity plectrum (7), gas-filled duct (3) are along the vertical arrangement of pile body (1), and the upper end opening, are close to pile tip (2) end closure, expansion hose (5) link to each other with gas-filled duct (3), prism (4) link to each other with expansion hose (5), prism (4) can stretch out pile body (1), the soil body is inserted, the triangular prism (4) drives the gear (6) to rotate when being stretched, and the elastic shifting piece (7) is clamped on the gear (6) and can only rotate along one direction.

2. The extended concrete precast pile suitable for the soft foundation according to claim 1, wherein: the stretching device utilizes the inflation pipeline (3) and the telescopic hose (5) to be inflated with high-pressure gas to push the triangular prism (4) to stretch.

3. The extended concrete precast pile suitable for the soft foundation according to claim 1, wherein: when the prism body (4) extends, the gear (6) is driven to rotate, and the elastic shifting piece (7) is clamped on the gear, so that the gear can only rotate along one direction.