CN104110032A

CN104110032A - Large-diameter hollow-cavity long-spiral thin-wall bored concrete pile casing

Info

Publication number: CN104110032A
Application number: CN201410365186.0A
Authority: CN
Inventors: 钟贞明; 郑添寿; 许万强; 孔秋平; 张强
Original assignee: FUJIAN YONGQIANG GEOTECHNICAL Co Ltd
Current assignee: FUJIAN YONGQIANG GEOTECHNICAL Co Ltd
Priority date: 2014-07-29
Filing date: 2014-07-29
Publication date: 2014-10-22
Anticipated expiration: 2034-07-29
Also published as: CN104110032B

Abstract

The invention discloses a large-diameter hollow-cavity long-spiral thin-wall bored concrete pile casing which comprises an outer tube and an inner tube. The outer tube with both ends open is hollow inside and sleeves the inner tube. A spiral blade is arranged on the outer wall of the outer tube, and the lower end of the spiral blade extends out of the lower end of the outer tube. A plurality of grooves are uniformly formed in the inner wall of the outer tube along the circumference and the length, balls mounted in the grooves are capable of rotating in any angle freely, thus socket jointing between the inner tube and the outer tube is achieved. Besides, soil cleaning plates are mounted at positions, close to the bottom end of outer tube, of the inner wall of the outer tube circumferentially. The large-diameter hollow-cavity long-spiral thin-wall bored concrete pile casing has the advantages of low requirement for power of long-spiral drilling machines and high bearing capacity on the condition of same concrete usage as compared with existing long-spiral drilling bored concrete pile casings and further is wide in stratum application range, easy and efficient in soil taking and safe in construction.

Description

The long spiral thin wall filling pile of major diameter cavity pipe casing

Technical field

The present invention relates to grout pile sleeve pipe, be specifically related to the long spiral thin wall filling pile of major diameter cavity pipe casing.

Background technology

In pile foundation engineering, long auger is pressed and filled with stake machine is to be widely used in the stake machine that building site construction is used, order about at power the long spiral fan arranging on the drill bit under main drilling rod and main drilling rod under effect and can disposablely get out a hole, again by hollow main drilling rod to concrete perfusion in stake hole and pile, it is high that long screw auger drilling deposited pile has bearing capacity, be suitable for the long advantage such as can freely change of the wide and stake of stratum scope, be widely used, but the application of long-spiral drilling machine in large-section in-situ concrete pile is but restricted, generally can only be used for the situation that castinplace pile diameter is less than 800mm, reason is that large-section in-situ concrete pile will overcome very large soil compaction and shear soil resistance in the time of drilling construction, long-spiral drilling machine cannot meet the demands on power.

In basic pile foundation engineering construction, the construction of super large, super deep pile foundation engineering pile is comparatively general, for large-section in-situ concrete pile type, at present, more advanced technique is to adopt large diameter thin wall bored concrete pile technology, this is a kind of immersed tube that adopts, fetch earth, dress mould, clear hole, lay reinforcing cage, concrete perfusion, tube drawing, form removal, backfill, the construction technology of pile, this construction technology has under equal requirement for bearing capacity, can reduce concrete amount, reduce costs or under equal concrete amount, can significantly improve the advantage of pile body flexural strength; The defect existing is: the mode that generally adopts the artificial shoveling of full section or machinery to cut the earth for large diameter thin wall pouring pile hole fetches earth, take this construction method not only to lavish labor on, and constructor need to arrive a bottom, hole in installation form, work progress has certain danger.

Summary of the invention

The object of this invention is to provide a kind of to long screw auger mechanomotive force require lower, under identical concrete amount, can obviously improve bearing capacity, be suitable for stratum scope wide, fetch earth simply efficiently, the major diameter cavity llong helix bored piles pipe casing of construction safety.

For realizing above object, the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing comprises the outer tube of inner hollow both ends open and is socketed on the inner tube in outer tube; Described outer tube outer wall is provided with spiral fan, and this spiral fan lower end exceeds outer tube bottom, and inboard wall of tube body is evenly provided with multiple races along circumference and length direction, ball is housed in race and can does arbitrarily angled rotation, realizes the socket of inner tube and outer tube; Outer tube wall is along the circumferential direction equipped with native clearly sheet near bottom.

Described clear native sheet is infundibulate, between its lower limb and inner tube, leaves gap.

The long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing main operational steps in the time of construction is as follows: 1. place cleaning; 2. vibration is sunk to above-mentioned inner tube to design elevation, and reserved certain length body exposes the soil body, facilitates outer tube to be inserted in; 3. be inserted in outer tube along outer wall of inner tube, and rotate outer tube along inner tube by ball under dynamic action, the outer tube outer wall soil body takes out along spiral fan, along with the continuous taking-up of the soil body, the clear native sheet of outer tube bottom can be cleared up the soil body on outer wall of inner tube, outer tube continues along outer wall of inner tube rotation until arrive design elevation, and in stake hole, the soil body all takes out; 4. extract outer tube, form annular stake hole; 5. sediment at the bottom of cleaning eye; 6. place reinforcing cage, concreting; 7. inner tube is extracted on concreting limit in limit; 8. pile.

The long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing, combine the advantage of large diameter thin wall bored concrete pile technology and long screw auger drilling deposited pile, power requirement can be reduced and annular thin wall castinplace pile can be formed again, in soft, hardpan, can construct, be suitable for stratum scope wide, there is following beneficial effect:

Compared with existing long screw auger drilling deposited pile, under equal requirement for bearing capacity, can reduce concrete amount on the one hand, reduce costs, or under equal concrete amount, can significantly improve pile body flexural strength; On the other hand, can also the not disturbance inner soil body, can not only reduce power requirement, has solved prior art and has made diameter exceed the problem that the application in the large-section in-situ concrete pile of 800mm is restricted because meeting the demands in long screw auger mechanomotive force; And solved the difficult problem that castinplace pile annular fetches earth, and also avoiding employing people frock mould, constructor is protected safely.

Brief description of the drawings

Fig. 1 is the long spiral thin wall filling pile pipe casing of major diameter cavity of the present invention vertical section schematic diagram;

Fig. 2 is the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing schematic cross section;

Fig. 3 is the positive elevational schematic view of the clear native slice mounting structure of the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing;

Fig. 4 is the clear native slice mounting structure side elevation schematic diagram of the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing.

Reference numeral: outer tube 1, inner tube 2, spiral fan 3, clear native sheet 4, ball 5 and race 6.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing is described in further detail.

As shown in Figure 1 to 4, the long spiral thin wall filling pile of major diameter cavity of the present invention pipe casing is made up of the outer tube 1 of inner hollow both ends open and the inner tube 2 being socketed in outer tube, outer tube is except by outer tube itself, also comprise that this spiral fan lower end of spiral fan 3(that is welded in tube wall exceeds outer tube bottom), the race 6 of inboard wall of tube body, be fixed on ball 5 in race, be welded in the infundibulate clear native sheet 4 of outer tube wall bottom on slightly, between clear native sheet base and inner tube 2, leave gap; Inner tube 2 is the steel pipe of inner hollow both ends open.

When construction, first by high-frequency vibratory hammer, inner tube 2 is vibrated to the insertion soil body, and reserved certain length body is outside the soil body, when outer tube 1 is inserted in along outer wall of inner tube after the reserved length section of inner tube, outer tube 1 rotates along outer wall of inner tube by ball 5 under power drives, and the spiral fan 3 that is welded on outer tube outer wall takes out the soil body; Due to Action of Gravity Field, along with the continuous taking-up of the soil body, the clear native sheet 4 of outer tube bottom can be cleared up the soil body of outer wall of inner tube, and outer tube constantly declines until the stake hole soil body all takes out along outer wall of inner tube.After outer tube arrives design elevation, extract outer tube 1, just formed thus an annular stake hole, at the bottom of utilizing Qi Jiang hole, clear hole, sediment is cleaned out, and then, transfers reinforcing cage, concreting, treat that concreting arrives certain height, limit is extracted interior tube edge and is returned slotting tamped concrete, has just formed needed thin wall filling pile.

Claims

1. the long spiral thin wall filling pile of a major diameter cavity pipe casing, comprises the outer tube of inner hollow both ends open and is socketed on the inner tube in outer tube, described outer tube outer wall is provided with spiral fan, and this spiral fan lower end exceeds outer tube bottom; It is characterized in that: the inboard wall of tube body of described outer tube is evenly provided with multiple races along circumference and length direction, ball is housed in race and can does arbitrarily angled rotation, realize the socket of inner tube and outer tube; Outer tube wall is along the circumferential direction equipped with native clearly sheet near bottom.

2. the long spiral thin wall filling pile of major diameter cavity pipe casing according to claim 1, is characterized in that: described clear native sheet is infundibulate, between its lower limb and inner tube, leaves gap.