CN103938623A

CN103938623A - Tubular pile construction method

Info

Publication number: CN103938623A
Application number: CN201310016474.0A
Authority: CN
Inventors: 张超
Original assignee: SHANGHAI PUDONG NEW ZONE INTELLECTUAL PROPERTY PROTECTION ASSOCIATION
Current assignee: SHANGHAI PUDONG NEW ZONE INTELLECTUAL PROPERTY PROTECTION ASSOCIATION
Priority date: 2013-01-17
Filing date: 2013-01-17
Publication date: 2014-07-23

Abstract

The invention provides a construction method of a tubular pile with a mechanically expanded pile toe and a twice expanded head and particularly relates to a tubular pile construction method. According to the method, a jet-grouted solid in a fixed shape is formed through the jet grouting technology. In this way, the twice expanded head at the bottom end of a precast tubular pile is formed, so that the single-pile bearing capacity of the precast tubular pile is improved substantially. The effective end area of the precast tubular pile is increased by multiple times than that of a common grouting tubular pile, so the single-pile bearing capacity of the precast tubular pile can be improved substantially, and the pile end area of the precast tubular pile can be expanded; since foundation construction is conducted on the precast tubular pile through the construction method of the tubular pile with the twice expanded head, compared with a common high-pressure rotary jet grouting tubular pile, the tubular pile with the mechanically expanded pile toe and the twice expanded head has the advantages that the bearing capacity of per unit length is increased, and the cost of the unit bearing capacity is lowered; compared with a common precast tubular pile, the tubular pile with the mechanically expanded pile toe and the twice expanded head has the advantage that the project period is greatly shortened because the length of the tubular pile is reduced.

Description

A kind of construction method of pile tube

Technical field

The present invention relates to building engineering field, particularly a kind of construction method of construction method pile tube of pile tube.

Background technology

Pile tube is high with its easy construction, bearing capacity as the new stake of one type, reliable in quality, comparatively economic dispatch advantage is more and more widely used.Pile tube processes as a kind of ground and pile foundation form just produces and obtained till now very large development from eighties of last century, is applied widely, and bringing into play huge effect in various building foundations.

In patent CN 201288325 Y, disclose a kind of high-pressure rotary-spray enlarged head pre-stress pipe pile, comprised prestressed concrete pipe, it is characterized in that stirring coagulation by high-pressure rotary-spray cement paste and pile pipe front end soil layer forms induration expansion pile head.Both produced with pile pipe end and be bonded to induration at the end of pile pipe, in pile pipe, utilize again and enter intraluminal soil plug manufacture induration, and itself and pile pipe end induration around can be bonded to entirety, and the area of the induration of pile pipe end is determined by designing requirement, its bearing capacity is strengthened, expand induration area, increase its bearing capacity of pile tip.But this invention effect in practice is not fairly obvious, and unit length bearing capacity is lower, and unit bearing capacity expense is higher, and the duration used is longer.

Summary of the invention

The present invention first carries out machinery rotation to pile top and expands, and improves a stake end area, then uses high pressure jet grouting technology in the stake end bottom having expanded, and forms the figurate induration of tool.So form twice of prefabricated tubular pile bottom enlarged footing, thereby improve greatly prefabricated tubular pile bearing capacity of single pile.

The present invention is based on and improve pipe pile end portion bearing capacity and give full play to pile body ability, and improve the target that existing slurry injection technique is limited by pipe pile floor space, so twice enlarged footing construction of experience, form twice of prefabricated tubular pile bottom enlarged footing, the common slip casting pipe pile of its live end Area Ratio improves several times, thereby can improve greatly prefabricated tubular pile bearing capacity of single pile, can expand pipe pile end area, utilize the construction method of twice enlarged footing pile tube, carry out prefabricated tubular pile foundation construction, compared with common high-pressure rotary-spray pile tube, improve unit length bearing capacity, reduce unit bearing capacity expense, compared with common prefabricated tubular pile, owing to reducing, stake is long, greatly shorten the duration.

Brief description of the drawings

The pile top of Fig. 1 mechanical amplification

Fig. 1: 1-sheath rod clamp, steel pipe in 2-, the outer steel pipe of 3-, 4-inner tube fixation clamp, 5-inner tube push rod, 6-outer tube push rod, the outer triangular steel plate of 7-, folding steel hinge plate in 8-, 9-pile top sheath, 10-sheath rod, 11-sheath rod shrinks clamp, and 12-shrinks clamp contact, 13-stay hook, 14-retainer ring

Fig. 2 pile top is opened completely

Fig. 2: 1-pushes away Zhang Gangguan

Detailed description of the invention

First pile top is carried out to machinery rotation and expand, improve a stake end area, then use high pressure jet grouting technology in the stake end bottom having expanded, form the figurate induration of tool.So form twice of prefabricated tubular pile bottom enlarged footing, thereby improve greatly prefabricated tubular pile bearing capacity of single pile.

As shown in Figure 1, pile top of the present invention adopts the design of " umbrella three blocks an ejector sleeve ": the principle that opens an umbrella, three have the clamp of special function, a multiplex Zhang Gangguan of pushing away.Three clamps are respectively sheath rod clamp, inner tube fixation clamp, sheath rod contraction clamp.

As shown in Figure 2, be lowered to and push away Zhang Gangguan, pile top is strutted as the shape that opens an umbrella, pile top is carried out to machinery rotation and expand, improve a stake end area.Carry out pile top rotation and push away while expansion, answer held stationary speed, ensure that once-through operation puts in place; And pay close attention to the pressure, moment of torsion, displacement situation etc. of monitoring.

The stake end bottom expanding in machinery rotation is used high pressure jet grouting technology, forms twice of prefabricated tubular pile bottom enlarged footing, thereby improves greatly prefabricated tubular pile bearing capacity of single pile.In common high pressure jet grouting technology, increase the pile top of mechanical amplification, improve by a relatively large margin prefabricated tubular pile bearing capacity of single pile.An enlarged footing concreting is complete, and the concrete such as need reach some strength, just can carry out high pressure jet grouting construction; Also can not be too late, cause concrete to harden completely, cannot penetrate.

Twice enlarged footing pile tube, is applicable to the following geological conditions of medium sand, is not suitable for for coarse sand and above stratum, need to strengthen geologic prospect; Twice enlarged footing pile tube, should not design longly, and conventionally stake is long should, in 30m, make use to bring into play its end

Specific embodiment: the pile top that uses machinery rotation to expand, the enlarged footing of formation, can expand pipe pile end area 300%; Utilize the construction method of twice enlarged footing pile tube, carry out prefabricated tubular pile foundation construction, compared with common high-pressure rotary-spray pile tube, unit length bearing capacity improves 140%, and unit bearing capacity expense reduces by 37%; Compared with common prefabricated tubular pile, due to reduce stake long, greatly shortened the duration.

Claims

1. a construction method for pile tube, is characterized in that: first pile top is carried out to machinery rotation and expand, improve a stake end area, then use high pressure jet grouting technology in the stake end bottom having expanded, form the figurate induration of tool.

2. the pile top of mechanical amplification according to claim 1, is characterized in that: pile top of the present invention adopts the design of " umbrella three blocks an ejector sleeve ": the principle that opens an umbrella, three have the clamp of special function, a multiplex Zhang Gangguan of pushing away;

According to claim 2, the pile top of mechanical amplification, is characterized in that: three clamps are respectively sheath rod clamp, inner tube fixation clamp, sheath rod contraction clamp.

3. method according to claim 1, is characterized in that: be lowered to and push away Zhang Gangguan, pile top is strutted as the shape that opens an umbrella, pile top is carried out to machinery rotation and expand, improve a stake end area.

4. method according to claim 1, is characterized in that: carry out pile top rotation and push away while expansion, answer held stationary speed, ensure that once-through operation puts in place; And pay close attention to the pressure, moment of torsion, displacement situation etc. of monitoring.