CN215482904U

CN215482904U - Multi-section type prestressed hollow pile

Info

Publication number: CN215482904U
Application number: CN202120767935.8U
Authority: CN
Inventors: 孙加超
Original assignee: Wisdri Engineering and Research Incorporation Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2022-01-11
Anticipated expiration: 2031-04-15

Abstract

The utility model relates to a multi-section type prestressed hollow pile which is formed by assembling and connecting a plurality of sections of hollow precast pile units, wherein each hollow precast pile unit comprises a pile body formed by a pile section on the pile section, the pile section is a disc-shaped high-grade reinforced concrete structure, the pile body is a hollow circular ring-shaped concrete structure poured on the pile section, the bottom of the pile body is sealed by the pile section and is provided with a section part with a circle of radial convex, and a grouting pipe and a backflow hole are further arranged on the area of the pile section in the pile body, so that the precast pile is convenient and fast to construct, can well protect the labor environment and reduce the construction cost.

Description

Multi-section type prestressed hollow pile

Technical Field

The utility model relates to the field of bridge engineering, in particular to a multi-section type prestressed hollow pile.

Background

In bridge engineering, the main flow forms of the pile mainly include a precast pile and a cast-in-place pile. The precast pile has the advantages of convenience in manufacturing, quick construction period, low manufacturing cost, easiness in controlling pile body quality, high bearing capacity, capability of adjusting the shape, the section size and the length as required and no mud discharge problem, but has the definite points of high pile driving noise, higher requirement of a static pressure machine on a site, poorer pile shearing resistance, incapability of rock embedding, poor control of verticality and the like.

The cast-in-place pile has the advantages of small harmful influence on adjacent buildings and surrounding environment, freely changeable pile length and diameter according to design requirements, capability of enabling a pile end to enter a bearing stratum or be embedded into a rock stratum, large bearing capacity of a single pile and the like, but has the defects of complex hole forming process, strict operation requirements, easiness in quality accidents, long technical interval time, incapability of immediately bearing load, more difficulty in winter construction, long construction period, high construction cost and the like.

Therefore, the precast pile which is convenient to construct, can well protect the labor environment and reduce the construction cost has urgent requirements in engineering.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-section type prestressed hollow pile, and provides a precast pile which is convenient to construct, can well protect the labor environment and reduce the construction cost.

The specific scheme is as follows:

the utility model provides a multisection formula hollow prestressed pile, is formed by the hollow precast pile unit erection joint of multisection, and each hollow precast pile unit all includes that the pile section forms the pile body on the pile section, discoid high-grade reinforced concrete structure is pour into to the pile section, the circular ring form concrete structure of cavity of pile body for pouring on the pile section, the pile section is sealed and has the radial protruding festival portion of establishing the round with the bottom of pile body to still set up mud jacking pipe and backward flow hole on the region that the pile section is located the pile body.

Further, the reinforcing bar in the pile body adopts double-deck arrangement, and wherein erect muscle diameter and be not less than 10mm, the interval is not more than 15cm to close on the bottom encryption of pile section and arrange.

Furthermore, the diameter of the stirrup of the vertical reinforcement is not less than 8mm, the distance between the stirrups is not more than 10cm, and an upper layer of distributed reinforcing steel bars and a lower layer of distributed reinforcing steel bars are arranged at the pile section.

Furthermore, an inclined strut is arranged between the bottom of the pile wall cavity of the pile body and the pile section.

Furthermore, epoxy resin cement mortar is smeared at the joint of two adjacent hollow precast pile units.

Compared with the prior art, the multi-section type prestressed hollow pile provided by the utility model has the following advantages: the multi-section prestressed hollow pile provided by the utility model has the advantages of short construction period, light weight, low manufacturing cost, high bearing capacity, simple process and simple requirement on sites by utilizing the processing mode of bearing pressure by a reinforced concrete plain joint and bearing tensile force by a thick prestressed reinforcement and well combining the advantages of a precast pile and a cast-in-place pile in order to ensure the reliability of force transmission at the joint of each pile section.

In addition, the multi-section prestressed hollow pile provided by the utility model also integrates the advantages of large-diameter prestressed hollow piles and bamboo joint piles, inherits the advantages of large-diameter drilled and buried prestressed concrete hollow piles, replaces a pile group foundation with a single pile, saves a bearing platform, greatly improves bearing capacity, reduces self weight, reduces the using amount of concrete and steel bars, can be directly connected with a pier at the upper part, has the advantages of the bamboo joint piles, and has the advantages of reliable quality, strong constructability, good connection performance, strong corrosion resistance, good durability, energy conservation and high efficiency, and can be firmly connected with the surrounding soil body, so that the end bearing capacity of the pile and the friction force with the surrounding soil body are greatly improved.

Drawings

Figure 1 shows a schematic view of a multi-section pre-stressed hollow pile.

Fig. 2 shows a front view of the hollow precast pile unit.

Fig. 3 shows a top view of a hollow precast pile unit.

Fig. 4 shows a schematic cross-sectional view of a hollow pre-pile unit.

Detailed Description

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The utility model will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1-4, the present embodiment provides a multi-section prestressed hollow pile, which is assembled and connected by a plurality of hollow precast pile units 1, each hollow precast pile unit 1 includes a pile body 12 formed by a pile section 11 on the pile section 11. Specifically, pile section 11 is to pour into discoid high-grade reinforced concrete structure, pile body 12 is for pouring the annular concrete structure of cavity ring on pile section 11, the reinforcing bar in pile body 12 adopts the bilayer to arrange, wherein erects the muscle diameter and is not less than 10mm, the interval is not more than 15cm, and close on the encrypted arrangement of bottom of pile section 11, the diameter of the stirrup of erecting the muscle is 8mm usually, the interval of stirrup is 10cm usually, and two-layer distribution reinforcing bar 13 about being equipped with in pile section 11 department.

The pile diameter and the pile length of the hollow precast pile unit 1 are determined according to the concrete conditions of the project, a pre-stressed hole 120 is reserved on the pile body 12, the pile section 11 seals the bottom of the pile body 12 and is provided with a section 110 which is radially and convexly provided with a circle, and a grouting pipe 111 and a backflow hole 112 are further arranged on the area of the pile section 11 in the pile body 12.

It should be clear that the high-grade reinforced concrete in this embodiment means that the concrete adopted by the high-grade reinforced concrete is high-grade concrete, specifically, the concrete with the strength grade of C60 or above, and the high-grade reinforced concrete has the characteristics of rapid hardening, high strength, high homogeneity, high compactness and the like, and is more beneficial to the assembly and connection between two adjacent hollow precast pile units 1.

In this embodiment, an inclined strut 14 is disposed between the bottom of the pile wall cavity of the pile body 12 and the pile section 11 to prevent the pile wall of the pile body 12 from cracking due to a large bending moment, thereby affecting the strength of the hollow precast pile unit 1.

In the present embodiment, preferably, the outer diameter of the pile section 11 is 1/6 to 1/5 larger than the outer diameter of the pile body 12, the wall thickness of the pile body 12 is 1/5 to 1/4 of the outer diameter of the pile body 12, and the height of the pile section 11 is 1/10 to 1/8 of the height of the pile body 12. In this embodiment, the outer diameter of pile body 12 is 3000mm, the outer diameter of pile section 11 is 3500mm, the thickness of pile body 12 is 350mm, the height of pile body 12 is 5000mm, and the height of pile section 11 is 500 mm. Within the range, the bearing capacity is ensured, and the advantages of light weight and low manufacturing cost can be realized.

The multi-section prestressed hollow pile provided by the embodiment well combines the advantages of a precast pile and a cast-in-place pile by utilizing the processing modes of bearing pressure of a reinforced concrete plain joint and bearing tension of a thick prestressed reinforcement for ensuring the reliability of force transmission at joints of each pile section, and has the advantages of short construction period, light weight, low manufacturing cost, high bearing capacity, simple process and simple requirement on sites.

The multisection formula prestressing force hollow pile that this embodiment provided has still synthesized the advantage of major diameter prestressing force hollow pile and bamboo joint stake, both inherited the major diameter and bored the advantage of burying prestressing force concrete hollow pile, replace the pile group basis with the single pile, save the cushion cap, the bearing capacity improves greatly, lighten the dead weight, reduce concrete and reinforcing bar quantity, upper portion can directly link to each other with the pier, have the advantage of bamboo joint stake again concurrently, the quality is reliable, constructability is strong, the connectivity is good, corrosion resistance is strong, the durability is good, energy-conservation is high-efficient, it is more firm to link with the soil body on every side, improve the end bearing capacity of stake and the frictional force with the soil body on every side greatly.

The multi-section prestressed hollow pile provided by the embodiment can be implemented by the following method, comprising the following steps of:

s1, forming holes; forming a construction hole at a construction point by using drilling equipment, wherein the diameter of the formed hole during drilling is larger than the diameter of a pile section and generally exceeds 200-300 mm; and (3) removing slag at the bottom of the pile after drilling to a designed elevation, and then throwing stones to the bottom of the construction hole, wherein 2-4 cm of broken stones or gravels are generally filled, and the thickness of the thrown stones is generally 0.25-0.3 times of the diameter of the pile body.

S2, pile placing; and hoisting and splicing the hollow precast pile units section by section, and ensuring that the hollow precast pile units are watertight. In order to ensure the waterproof performance of each hollow precast pile unit joint, epoxy resin cement mortar is generally coated on the reinforced concrete plain joint. When hoisting, because the buoyancy of the pile body is larger than the self-weight, the valve of the grouting pipe can be closed, and water is poured into the pile to sink to the designed elevation.

S3, pile side grouting; after all the hollow precast pile units are installed and spliced, the grouting pipes are placed around the piles and gravel is backfilled, and then cement paste is injected in a pressing mode to form underwater stone-filled concrete together with the backfilled stones, so that the resistance of the pile ends and the pile sides can be effectively improved, and the settlement amount of the piles is greatly reduced.

S4, grouting at the pile end; after the pile side is grouted for 30 days, pile end secondary grouting is carried out, and a convex (similar to a garlic head shape) curing area is formed in the pile end soil layer through diffusion of cement paste under high pressure, so that the pile end soil layer is reinforced, and the bearing capacity of the pile end is greatly improved.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a multisection formula prestressing force hollow pile which characterized in that: the hollow precast pile unit of multisection is assembled and connected and is formed, and each hollow precast pile unit all includes that the pile section forms the pile body on the pile section, discoid high-grade reinforced concrete structure is pour into to the pile section, the circular annular concrete structure of cavity of pile body for pouring on the pile section, the pile section is sealed and has the radial protruding festival portion of establishing the round with the bottom of pile body to still set up mud jacking pipe and backward flow hole on the region that the pile section is located the pile body.

2. A multi-section prestressed hollow pile according to claim 1, characterized in that: the reinforcing bar in the pile body adopts the double-deck to arrange, and wherein erects muscle diameter and is not less than 10mm, and the interval is not more than 15cm to close on the bottom encryption of pile section and arrange.

3. A multi-section prestressed hollow pile according to claim 2, characterized in that: the diameter of the stirrup of the vertical reinforcement is not less than 8mm, the distance between the stirrups is not more than 10cm, and an upper layer and a lower layer of distributed reinforcing steel bars are arranged at the pile section.

4. A multi-section prestressed hollow pile according to claim 1, characterized in that: and an inclined strut is arranged between the bottom of the pile wall cavity of the pile body and the pile section.

5. A multi-section prestressed hollow pile according to claim 1, characterized in that: and epoxy resin cement mortar is smeared at the joint of two adjacent hollow precast pile units.