CN1553004A

CN1553004A - Miniature drilling perfusion pile construction method

Info

Publication number: CN1553004A
Application number: CNA031469752A
Authority: CN
Inventors: 叶照桂
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-27
Filing date: 2003-09-27
Publication date: 2004-12-08
Anticipated expiration: 2023-09-27
Also published as: CN1243160C

Abstract

A thinner bore piling up method is carried out by: 1) boring thinner holes with diameter <= 300mm into certain depth of rocks, 2) putting steel pipes into the holes, 3) inserting steel bars or steel bar cages into the steel pipes, 4) filling concrete into the steel pipes, 5) drawing the steel pipes out of the holes, and welding upper ends of the steel bars with foundation or other arrangement. The steel pipes are used as casing tubes to prevent piles broken in cause of filling up due to wall collapse or traveling sand or soft foundation. Bearing capacity can be guaranteed with solid piles, with low cost and easy operation.

Description

A kind of mini-drill cast-in-place pile construction method

Technical field

The present invention relates to the method for a kind of consolidated subsoil in the civil engineering, especially a kind of in miniature wellhole the job practices of the solid pile of cast in situs.

Background technology

As everyone knows, in the civil engineering, often will handle ground and basis, wherein bored pile, characteristics such as cost moderate, easy construction strong with its compliance as a kind of basic form are widely used in highway bridge and other engineering fields.And castinplace pile belongs to concealed work, but because the factor of influence concern pile driving construction quality is a lot, all must be strict with each link of its work progress, all detailed consideration must be arranged to various influence factors, as the come-up of geologic(al) factor, bore process, retaining wall, reinforcing cage, concrete configuration, perfusion etc.If careless slightly or measure is not tight, will produce quality accident, cause heavy losses to national wealth.Because slight slump is difficult for being discovered in construction in the perfusion, so loose, the necking down in hole that prevents to collapse, avoiding broken pile to scrap is urgent problem in the bored pile construction.Application number is that 99122452 Chinese patent discloses a kind of method that is used for forming in preformed wellhole the pile of a cast in situs, the step that this method comprises has: (a) sleeve is inserted a wellhole, this sleeve is made of the two or more parts that are connected by expansible sealing plate, and this sleeve have be provided with along its length compartment of terrain, be used to make its radially expanded device; (b) when sleeve inserts or after this, the steel reinforcement with a pile inserts in the wellhole; (c) or before sleeve inserts wellhole or after sleeve inserts, the concrete that will be used to form pile adds in the wellhole, to be located at around sleeve and the steel reinforcement; And (d) expansion sleeve, force not dried water-bearing concreae of being positioned at around it sidewall against wellhole.

The weak point of this method is: the first, and tube-in-tube structure is too complicated, inconvenient operation during practice of construction; The second, the steel reinforcement is to insert in the wellhole, and the pile that forms after sleeve is taken away is a hollow, might cause construction hidden danger.

In sum, construct, then must be difficult to satisfy engineering and finish smoothly, even may have serious accident potential as the castinplace pile method of commonly using by this.

Summary of the invention

The inventor has the ground of two more than ten years to handle and the underpin experience, because the problem that foundation occurs is conscientiously studied intensively practice through the carefulness observation, has a kind of mini-drill cast-in-place pile construction method of the present invention to be born eventually.

The present invention's main purpose is the defective at the method for the pile of existing cast in situs, and providing a kind of does not need to increase special equipment, and the job practices of the better consolidation effect of tool.

For this reason, the present invention is achieved in that a kind of mini-drill cast-in-place pile construction method, comprises following construction sequence:

(a) adopt rig or other pore-forming equipment well bores certain depth to the rock stratum, the diameter≤300mm of wellhole;

(b). the miniature steel pipe lower port slightly littler than well diameter is inserted to this bottom, hole;

(c). in described miniature steel pipe, insert reinforcing bar or reinforcing cage;

(d). in described miniature steel pipe, inject concrete;

(e). described miniature steel pipe is extracted;

(f). end bar welds with basis or other facilities as required in the stake.

The invention has the beneficial effects as follows owing to adopted the very little wellhole of diameter.And in the hole, put into the method for miniature steel pipe earlier, both effectively avoided occurring in the filling process phenomenon that cave-in serious or drift sand, soft plastic shape character etc. can cause similar silt broken pile as sleeve pipe; Simultaneously, sleeve pipe has adopted miniature steel pipe common on the market, saves cost, operate simple and easyly, is a kind of very method of the cast in situs pile of practicality.In addition, be solid because the present invention waters the stake that builds up, bearing capacity has also obtained reinforcement.

Description of drawings

Fig. 1 is the schematic diagram of the present invention's step (b)

Fig. 2 is the schematic diagram of the present invention's step (c)

Fig. 3 is the schematic diagram of the present invention's step (d)

Fig. 4 is the schematic diagram of the present invention's step (e)

The specific embodiment

A kind of mini-drill cast-in-place pile construction method, its construction sequence comprises:

(a) adopt rig or other pore-forming equipment well bores to the fresh complete rock stratum 0.5 meter, the diameter≤300mm of wellhole;

(d). in described miniature steel pipe, inject concrete;

(e). described miniature steel pipe is extracted;

(f). end bar welds with basis or other facilities as required in the stake.

Claims

1. mini-drill cast-in-place pile construction method is characterized in that this method comprises following construction sequence:

(d). in described miniature steel pipe, inject concrete;

(e). described miniature steel pipe is extracted;

(f). end bar welds with basis or other facilities as required in the stake.

2. mini-drill cast-in-place pile construction method as claimed in claim 1 is characterized in that rig or other pore-forming equipment well bores to the fresh complete rock stratum 0.5 meter.