CN103362122A - High-bearing-capacity sand filling pipe pile with pile joints and manufacturing and construction method of pile - Google Patents

Abstract

The invention discloses a high-bearing-capacity sand filling pipe pile with pile joints, which is characterized in that the pile joints 0.5-20 cm larger than a pile body are arranged on the pile body of the pipe pile at intervals of 0.3-4 m; the width of each pile joint is 0.5-20 cm; longitudinal drainage holes are formed in the pile joints; filled sand or gravel about 0.5-20 cm thick is arranged outside the pile body; a pipe pile part or a precast pile capable of entering a harder supporting layer is arranged at the lower part of the pile body; and a pile tip is a steel pile tip or a reinforced concrete pile tip with a steel sharp corner. Compared with the prior art, stress water in a soil layer caused by piling can be drained economically, effectively and more quickly along the filled sand or the gravel at the periphery of the pile; mucky soil solidification can be accelerated; side friction resistance of soil at the periphery of the pile can be increased; the pipe pile part or the precast pile at the lower end of the pile can be punctured into the harder supporting layer to increase end bearing force; and the pile is applicable to coastal reclamation regions of China.

Description

A kind of high-bearing capacity band pile section back-up sand pile tube and making job practices thereof

Technical field

The present invention relates to the building foundation field, relate in particular to a kind of high-bearing capacity band pile section back-up sand pile tube and make job practices.

Background technology

In the China coast city, blazoning soft foundation, especially reclaim fields from the sea mud or stream mud water content (ω ₀) 70-94, and bad hydraulic permeability.Build pier storage yard, speedway, factory building, multistory building at this class foundation soil, its ground must be processed.At present, ground is processed sand pile, broken stone pile, cement mixing pile, powder spray piling, rotary churning pile, plastic slab and the vacuum preloading that uses, and its disadvantage is that settlement amount after construction can reach tens of centimetres to one, two meter, brings inconvenience to the user.Adopt the Pile Foundations Design such as pile tube, pipeline sinking pile, preformed pile, the one, cost is high, and the 2nd, the stress water pressure increases in the mud that piling causes, can't discharge again, cause earth heaving, and wrap up in the tens of centimetres of the pile shaft floating up of squeezing into, reduce bearing capacity, produce the pile body displacement, until broken pile.

200320127200.0 major part back-up sand pile for prestressed pipe of my invention can make the friction-type pile tube improve bearing capacity, strengthen all sludge dewatering and solidifyings of stake, but can not enter harder bearing stratum.

Summary of the invention

The invention provides a kind of high-bearing capacity band pile section back-up sand pile tube and make job practices, can economical, effectively improve the pile tube bearing capacity, stress water in the soil layer that piling can be caused is discharged fast along stake week back-up sand or sandy gravel stratum, accelerated the dehydrating and curing of all mucky soils of stake, the all native side frictions of stake have been improved, and make pile tube can enter harder bearing stratum to improve the end load, reduce building final settlement.

The technical solution adopted in the present invention is: a kind of high-bearing capacity band pile section back-up sand pile tube is the same with prior art, the tubulose pile body that all includes prestressed reinforced concrete, it is characterized in that, on tubular pile body, every 0.3-4m pile section than the large 0.5-20cm of pile body is arranged, the wide 0.5-20cm of pile section, pile section is provided with the longitudinal drainage hole, pile body has the thick back-up sand of 0.5-20cm or gravel outward, the pile body bottom be for entering pile tube or the preformed pile of harder bearing stratum, and pile top is steel pile tip or with the steel concrete pile top of steel wedge angle.

A kind of making job practices of high-bearing capacity band pile section back-up sand pile tube is characterized in that may further comprise the steps successively:

1., found steel end plate, colligation prestressed reinforcement or plain bars on end plate at the counterdie two ends with the pile section pile tube;

2., the plastics tubule of pre-buried 1 draining on the counterdie pile section, in this counterdie, pour concrete into thereafter, cover patrix, and tighten the upper and lower mould bolt that interlocks;

3., the upper and lower mould High Rotation Speed, concrete under centrifugal force forms the pile tube blank with pile section, the gang mould tool is hung steam-cured in the steam-cured pond together;

4., after concrete strength of pile reaches, it is transported to the job site;

5., sling by the stake machine and to stand on the stake position without pile section pile tube or preformed pile, the upper heap sand in stake position is without pile section pile tube or preformed pile lower end adopting steel pile tip or with the steel concrete pile top of steel wedge angle;

6., by the stake machine first squeezing into or be pressed in the soil without pile section pile tube or preformed pile, connect again band pile section pile tube, during pile section was buried sand or gravel band, filling was in stake week, pile tube is directly got to design elevation.

A kind of high-bearing capacity band pile section back-up sand pile tube compared with prior art, have obvious superiority: stress water is discharged along stake week back-up sand or sandy gravel stratum in the soil layer that causes of economic, effectively accelerating to drive piles, accelerate the dehydrating and curing of all mucky soils of stake, improve all native side frictions of stake, the bearing capacity of pile tube is improved, stake lower end pile tube or preformed pile can thrust harder bearing stratum and improve the end load, and this invention is applicable to the China coast area of reclaiming fields from the sea.

The invention will be further described below in conjunction with accompanying drawing 1 and specific embodiment.

Description of drawings

Fig. 1 is embodiment of the invention schematic diagram.

Drawing explanation: 1. miscellaneous fill, 2. cushion cap, 3. tubular pile body, 4. pile section, 5. drain hole, 6. back-up sand, 7. mud, 8. ring-type steel plate, 9. clay, 10. without the pile section pile tube, 11. loams, 12. steel concrete pile tops, 13. steel wedge angles, 14. severely-weathered rock stratum.

The specific embodiment

Figure 1 shows that exemplary embodiments of the present invention, a kind of high-bearing capacity band pile section back-up sand pile tube includes the tubulose pile body (3) of prestressed reinforced concrete, it is characterized in that, every 2m pile section (4) than the large 10cm of tubular pile body (3) is arranged tubular pile body (3) is upper, the wide 10cm of pile section (4), pile section (4) is provided with longitudinal drainage hole (5), and the thick back-up sand of 10cm (6) is arranged outside the pile body (3).

Below brief description embodiment makes job practices:

1., in the counterdie with the pile tube of pile section, the colligation prestressed reinforcement;

2., the plastics tubule of pre-buried 1 draining on the counterdie pile section, in this counterdie, pour concrete into thereafter, cover patrix, and tighten the upper and lower mould bolt that interlocks;

3., the upper and lower mould High Rotation Speed, make concrete under centrifugal force, form the blank of the pile tube (3) of band pile section (4), the gang mould tool is hung steam-cured in the steam-cured pond together;

4., after concrete strength of pile reaches, it is transported to the job site;

5., sling by the stake machine and to stand on the stake position without pile section pile tube (10), the upper heap sand in stake position adopts the steel concrete pile top (12) of band steel wedge angle (13);

6., will be squeezed in the soil without pile section pile tube (10) by the stake machine, burn-on and pile section (4) the thick ring-type steel plate of isodiametric 20mm (8), suspender belt pile section pile body (3) welds with ring-type steel plate (8), the stake machine will be with pile section pile tube (3) to squeeze in the soil, during ring-type steel plate (8) and pile section (4) are buried the abrasive band, filling is in stake week, and pile tube is got to design elevation, namely finishes making construction of the present invention.

Claims (2)

1. a high-bearing capacity band pile section back-up sand pile tube is the same with prior art, the tubulose pile body that all includes prestressed reinforced concrete, it is characterized in that, on tubular pile body, every 0.3-4m pile section than the large 0.5-20cm of pile body is arranged, the wide 0.5-20cm of pile section, pile section is provided with the longitudinal drainage hole, and pile body has the thick back-up sand of 0.5-20cm or gravel outward, the pile body bottom be for entering pile tube or the preformed pile of harder bearing stratum, and pile top is steel pile tip or with the steel concrete pile top of steel wedge angle.

2. the making job practices of a high-bearing capacity band pile section back-up sand pile tube is characterized in that may further comprise the steps successively:

1., found steel end plate, colligation prestressed reinforcement or plain bars on end plate at the counterdie two ends with the pile section pile tube;

2., the plastics tubule of pre-buried 1 draining on the counterdie pile section, in this counterdie, pour concrete into thereafter, cover patrix, and tighten the upper and lower mould bolt that interlocks;

3., the upper and lower mould High Rotation Speed, concrete under centrifugal force forms the pile tube blank with pile section, the gang mould tool is hung steam-cured in the steam-cured pond together;

4., after concrete strength of pile reaches, it is transported to the job site;

5., sling by the stake machine and to stand on the stake position without pile section pile tube or preformed pile, the upper heap sand in stake position is without pile section pile tube or preformed pile lower end adopting steel pile tip or with the steel concrete pile top of steel wedge angle;

6., by the stake machine first squeezing into or be pressed in the soil without pile section pile tube or preformed pile, connect again band pile section pile tube, during pile section was buried sand or gravel band, filling was in stake week, pile tube is directly got to design elevation.

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