CN2756706Y

CN2756706Y - Pile bottom pust filling prestress pipe pile

Info

Publication number: CN2756706Y
Application number: CN 200420109630
Authority: CN
Inventors: 吴才德; 沈俊杰; 陈忠; 孔清华
Original assignee: NINGBO CITY DESIGN INST OF ELECTROMECHANICAL INDUSTRY
Current assignee: NINGBO CITY DESIGN INST OF ELECTROMECHANICAL INDUSTRY
Priority date: 2004-11-05
Filing date: 2004-11-05
Publication date: 2006-02-08
Anticipated expiration: 2014-11-05

Abstract

A pile bottom post grouting pre-stress pipe pile is equipped with a grouting pipe with a pre-prepared grout outlet hole inside a pile cutoff. The bottom of the pile cutoff is fixedly provided with a tip ironware which is fixed with a sub-seal steel plate. The grouting pipe extends downwards via the sub-seal steel plate. The extension segment is equipped with a rubber sleeve, with a guard tube plate fixedly connected to the bottom of the extension segment. A floor is connected between the guard tube plate and the sub-seal steel plate. The utility model improves the structure of the bottom of the pipe pile and reinforces the bearing layer of the tip viathe post grouting technology, which is a new pile of a single pre-stressed pipe pile technique which brings in grouting technology for the bottom of the pile. The resistance of the bottom of the new pipe pile is greatly increased to effectively perform the resistance of the round of the pipe pile so as to greatly improve the bearing capacity of the pile and obtain the goal of reducing the construction cost, decreasing density of the pile, and reducing effect of earth-squeeze on the surrounding. And new species of pre-stress pipe piles of industrial product are added.

Description

The pile bottom post-grouting pile for prestressed pipe

Technical field

The utility model relates to the pile for prestressed pipe of steel bar concrete pile tube technology, the especially pile bottom post-grouting of building in the civil construction project.

Background technology

Pile for prestressed pipe is the commodity stake of millwork large-scale production, is a kind of stake type commonly used that reliable quality guarantees that has, and is a kind ofly to adopt that centrifugal high pressure is built, the concrete piles compactness reaches 100% high strength concrete stake.But concerning coastal deep soft soil, with all be Piles for Friction Piles, stake must be pressed into soil layer as pile foundation and support upper load, and the pile tube perisporium that buries is poor with all native associativities of stake, the sidewall frictional resistance can not effectively be brought into play, the load-carrying properties of stake are obviously reduced, only prevent that the stake end from thrusting distortion, reinforce bearing stratum, improve the end bearing value, then Zhuan sidewall frictional resistance just can recover to increase gradually, the bearing capacity value of stake is increased substantially, thereby reduce the stake number and reduce construction costs, reduce the density that lays out pile, reduce soil compaction to adjacent week influence, so how strengthening the stake end intensity of pile tube is to realize the effective measure of above-mentioned target, through patent retrieval, also still there are not the effective measures that address the above problem.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of and prevents that effectively stake end from thrusting distortion, increase the sidewall frictional resistance of stake, the pile bottom post-grouting pile for prestressed pipe of the bearing capacity that increases substantially with regard to being to overcome the defective of prior art.

Embodiment of the present utility model is:

A kind of pile bottom post-grouting pile for prestressed pipe, it includes pile cutoff, it is characterized in that being provided with in the described pile cutoff along centralized positioning and be shaped on the Grouting Pipe of slurry outlet in the bottom in advance, the pile cutoff bottom is fixed with stake end ironware, the back cover steel plate fixes with it, and Grouting Pipe is passed the back cover steel plate and extended to the bottom, is set with rubber sleeve on the extension, the bottom of the extension pillar plate that is connected is connected with floor between pillar plate and back cover steel plate.

It is radially radial uniform that described floor is.

Described floor is selected 4～10 by stake footpath size.

Compared with prior art, the utility model improves pile tube stake bottom structure, but form the special stake bottom structure that batch production is produced, reinforce bearing course at pile end by post grouting process, a bottom resistance is increased substantially, thereby the collateral resistance of stake can normally be brought into play, the bearing capacity value of stake improves 40～80% after tested, can reduce a number and soil compaction to adjacent all influences, make the construction costs of stake reduce by 20～40%.

Description of drawings

Fig. 1 is the utility model broken section structure chart.

Fig. 2 is the upward view of Fig. 1.

Fig. 3 is the A-A sectional view of Fig. 2.

The specific embodiment

Embodiment is elaborated to the utility model again below with reference to accompanying drawing.

Shown in Fig. 1～3, the pile bottom post-grouting pile for prestressed pipe is determined pile length according to the bearing stratum buried depth, and pile for prestressed pipe is formed engineering piles by single-unit or more piece, and is when constructing by traditional pile sinking pile extension technology that the Grouting Pipe spreading is extremely suitable for reading.Pile for prestressed pipe according to slip casting after bearing capacity value checking computations pile body cross-sectional strength determine the hollow section stake or irritate the solid section stake of real concrete.

No matter be hollow section stake or solid section stake, what it at first buried is to save pile cutoff down, the bottom solid welding of pile cutoff 1 has stake end ironware 7, has the back cover steel plate 3 of preformed hole to be welded between two parties on the stake end ironware than the little 40～50mm of pile tube diameter, thickness 12mm, center diameter.Grouting Pipe 2 diameters that the bottom is shaped on slurry outlet 8 in advance are 25～40mm, slurry outlet stays three rows, aperture φ 8mm, be 90 ° of symmetric arrays, the reservation centre bore that Grouting Pipe is passed the back cover steel plate makes it be positioned at the center along the periphery welding, and extends 150mm to the bottom, and suit is slightly less than the rubber sleeve 6 of caliber on the extension, can utilize bicycle tube to make, then at bottom, extension solid welding steel pillar plate 5.For intensity at the bottom of strengthening, solid welding has floor 4 between pillar plate 5 and back cover steel plate 3, it is radially radial uniform that floor is, big or small by the stake footpath with 6,8 are optimal selection, and the weld that will guarantee floor and pillar plate to leave rubber sleeve external diameter distance be 5～10mm, so just finish the structure design of pile tube shoe, make the concrete of the high pressure that pours into by Grouting Pipe 2 make rubber sleeve 6 expansions form the one way valve principle through slurry outlet 8 ejections, concrete just rubber sleeve top and the bottom after expand is extruded, because of the barrier effect of rubber sleeve can not recoiled to Grouting Pipe concrete by slurry outlet, concrete just fills up the space between stake floor 4, having reinforced bearing course at pile end increases substantially end resistance, the all collateral resistances of stake are effectively brought into play, thereby the purpose that the bearing capacity value that reaches stake increases substantially, it is the novel stake that a kind of single pile for prestressed pipe technology is introduced pile bottom grouting technique, be to reduce construction costs, reduce the density that lays out pile, reduce the novel stake of soil compaction, increase new kind for the pile for prestressed pipe of plant produced simultaneously adjacent week influence.

Claims

1, a kind of pile bottom post-grouting pile for prestressed pipe, it includes pile cutoff (1), it is characterized in that being provided with in the described pile cutoff along centralized positioning and be shaped on the Grouting Pipe (2) of slurry outlet (8) in the bottom in advance, the pile cutoff bottom is fixed with stake end ironware (7), back cover steel plate (3) fixes with it, Grouting Pipe (2) is passed back cover steel plate (3) and is extended to the bottom, on the extension, be set with rubber sleeve (6), the bottom of the extension pillar plate (5) that is connected is connected with floor (4) between pillar plate (5) and back cover steel plate (3).

2, pile bottom post-grouting pile for prestressed pipe according to claim 1 is characterized in that described floor (4) is radially radial uniform.

3, pile bottom post-grouting pile for prestressed pipe according to claim 1 and 2 is characterized in that described floor (4) is by 4～10 of stake footpath size selections.