CN205399410U

CN205399410U - Dig first slip casting club -footed pile of drilling soon

Info

Publication number: CN205399410U
Application number: CN201620108264.3U
Authority: CN
Inventors: 岳大昌; 贾欣媛
Original assignee: CHENGDU SIHAI GEOTECHNICAL ENGINEERING Co Ltd
Current assignee: CHENGDU SIHAI GEOTECHNICAL ENGINEERING Co Ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2016-07-27
Anticipated expiration: 2026-02-01

Abstract

The utility model provides a dig first slip casting club -footed pile of drilling soon has the steel reinforcement cage in its pile body, its characterized in that, and the pile body includes at the bottom of straightway pile body and the stake of reaming section, divideing into the section of expanding and the section of going to the bottom at the bottom of the stake of reaming section, the straightway pile body is annotated in the section of expanding on and is filled with the concrete, annotates in the section of going to the bottom to be filled with the sand cobble and to mix the gluing that forms with the grout and personally experience sth. Part of the body. The grout is cement mortar or neat slurry. The utility model discloses a sediment at the bottom of need not settleing, first slip casting behind the pore -forming, reaming again, it is high that the cobble and the grout at the stake end mix the glued body intensity that forms, does not have a stake end sediment, and the bearing capacity of stake is secure, no longer need use a large amount of mud off, practice thrift the resource, the cost is reduced has reduced environmental pollution.

Description

A kind of rotary digging drilling hole first bottom-grouting-enlarged stake

Technical field

This utility model relates to foundation club-footed pile engineering, is especially that the bottom-grouting-enlarged pilework of rotary digging drilling hole elder generation that ovum layer of sand, construction are not limited by level of ground water is relevant with a kind of ground soil property type that is suitable for.

Background technology

In recent years, along with high level, Super High, collapse a large amount of construction of the building such as bridge greatly, building (structure) thing is more and more higher to the requirement for bearing capacity of pile foundation, this makes the bearing capacity that base form possesses more and more higher, and large-section in-situ concrete pile and club-footed pile also become the main foundation form of this type of building.Showing according to relevant result of the test: for club-footed pile, under identical stake shaft diameter size, the axial allowable bearing of single pile improves more than 30% than isometrical stake；And when same bearer power, save more than 25% than isometrical pile concrete consumption, and stake footpath is more big, and saving is more many.Therefore, club-footed pile and large-section in-situ concrete pile are compared, and can better play its bearing capacity of pile tip, the raising of bearing capacity of single pile, and reduce and the stake number of pile body diameter reduce, and have saved pile body and cushion cap concrete, and economic benefit is more apparent, also applies wide in recent years.

Conventional club-footed pile, the artificial reaming of many employings, mechanical hole reaming is applicable to lithostratigraphy or soil layer, and for boulder bed stratum, it is easy to collapse hole, scarfing cinder difficulty, pile quality not easily ensures, therefore, the performance of club-footed pile advantage is greatly limited.

Utility model content

This utility model provides a kind of rotary digging drilling hole first bottom-grouting-enlarged stake, not enough to solve above-mentioned prior art, does not need clear pile bottom sediment, first slip casting after pore-forming, then reaming, the adhesive bond intensity that the cobble at the bottom of stake and cement mortar are mixed to form is high, without pile bottom sediment, the bearing capacity of stake is secure.

In order to realize the purpose of this utility model, intend adopting techniques below:

A kind of rotary digging drilling hole first bottom-grouting-enlarged stake, steel reinforcement cage is had in its pile body, it is characterized in that, pile body includes at the bottom of straightway pile body and reaming section stake, expansion section and the section of going to the bottom it is divided at the bottom of reaming section stake, in straightway pile body and upper expansion section, note is filled with concrete, and in the section of going to the bottom, note is filled with the adhesive bond that sandy gravel is mixed to form with cement mortar.

Further, described cement mortar is cement mortar or neat slurry.

The beneficial effects of the utility model are:

1, this utility model construction technology is simple, by mechanical hole building and be aided with set cylinder-wall, pore-forming efficiency and safety far above manually digging hole, and is not limited by hole depth and pore size, applied widely, quality height simultaneously；

2, this utility model belongs to base expanding and base expanding class pile foundation, can improving side resistance and the end resistance of stake to a certain extent, thus realizing the generally raising of bearing capacity, anti-floating and withdrawal resistance, having stronger practicality at the bottom of the reaming section stake of its underpart；

3, this utility model does not need clear pile bottom sediment, pore-forming grouting behind shaft or drift lining, then carries out reaming, and the adhesive bond intensity that the sandy gravel at the bottom of stake and cement mortar are mixed to form is high, and without pile bottom sediment, the bearing capacity of stake is secure；

4, this utility model need not consider that a side collapses hole, even if sandy gravel has a degree of being caving, but at the bottom of all dropping down onto under gravity, after mixing with cement mortar, forms adhesive bond, does not affect the bearing capacity of stake；

5, this utility model no longer needs to use a large amount of mud off, has saved resource, has reduced cost, has decreased environmental pollution.

Accompanying drawing explanation

Fig. 1 illustrates structural representation of the present utility model.

Fig. 2 illustrates " perforate " step schematic diagram of this utility model construction technology process.

Fig. 3 illustrates " slip casting " step schematic diagram of this utility model construction technology process.

Fig. 4 illustrates " reaming " step schematic diagram of this utility model construction technology process.

Fig. 5 illustrates the schematic diagram of this utility model construction molding.

Detailed description of the invention

As shown in Figure 1, a kind of rotary digging drilling hole first bottom-grouting-enlarged stake, steel reinforcement cage 3 is had in its pile body, pile body includes at the bottom of straightway pile body 1 and reaming section stake 2, at the bottom of reaming section stake, 2 are divided into expansion section 2-1 and the section of going to the bottom 2-2, in straightway pile body 1 and upper expansion section 2-1, note is filled with concrete 4, and in the section of going to the bottom 2-2, note is filled with the adhesive bond 7 that sandy gravel 5 is mixed to form with cement mortar 6.Concrete, described cement mortar 6 is cement mortar or neat slurry.

In conjunction with Fig. 2～Fig. 5, elaborate form of construction work of the present utility model further:

(1) rig location: first the relevant data such as the coordinate of design drawing offer, elevation are conscientiously checked, confirm that errorless rear employing total powerstation carries out the setting-out of stake position, after pile center's setting-out, draw cross hairs to beyond 1.5m and perform fender pile labelling along pile center.

(2) perforate: perforate can be carried out after completing pile foundation site localization.Drilling equipment is in place, rise lift drilling rod, drilling bucket is installed, adjusts drilling rod perpendicularity, alignment stake holes center, then start carries out rotation and takes soil perforate to be that steel pile casting is embedding prepare.Perforate adopts dry type drill bit to carry out, and perforate is sized to design stake footpath.After steel pile casting installation, measure casing elevation of top surface with level instrument and marked, for the auxiliary measuring of drilling depth and concreting height.

(3) creep into and fetch earth: drilling bucket is vertically put down and starts rotation after borer drill rod is turned back to stake holes position and fetch earth, soil is filled how many according to drilling rod falling head and test and judge drilling bucket, rise before bucket unloads soil and first reversely rotate 2 weeks, utilize friction that movable floor is closed charging aperture, slowly drilling bucket can be promoted and remove casing afterwards and unload soil.Stratum, to design supporting course, is differentiated, then holes to projected depth by boring.Perforate completes, and after fetching earth, construction effect is as shown in Figure 2.

(4) slip casting: Grouting Pipe being put at the bottom of stake, cement injection 6 in stake holes, injected slurry volume is more than volume at the bottom of enlarged footing.After slip casting completes, construction effect is as shown in Figure 3.

(5) reaming: after having noted slurry, changes drill bit into reaming bit, puts into hole to both sides reaming, after reaming aperture puts in place, it is proposed to drill bit.After reaming completes, construction effect is as shown in Figure 4.

(6) put steel reinforcement cage 3: after reaming completes, hang steel reinforcement cage 3 immediately.Steel reinforcement cage 3 adopts hoisted in position of crane.Deformation should be prevented when carrying and lifting, lay and should be directed at position, hole, hang and directly hold up surely, slowly put down, it is to avoid collision hole wall and free-falling, should fix immediately after in place.

(7) casting concrete 4: during underwater casting mode casting concrete 4, ensure bottom conduit to the distance at the bottom of hole be 300mm～500mm, during first penetration concrete 4, leave enough storage levels, should less than 0.8m below Transducers Embedded in Concrete 4 perfusion face of conduit, pouring underwater concrete 4 must be constructed continuously, and last groundwater increment should control to some extent, and super filling is highly 0.8m～1.0m.

After completing above-mentioned steps, rotary digging drilling hole first bottom-grouting-enlarged pile driving construction molding, molding effect is as shown in Figure 5.

Claims

1. a rotary digging drilling hole first bottom-grouting-enlarged stake, steel reinforcement cage (3) is had in its pile body, it is characterized in that, pile body includes at the bottom of straightway pile body (1) and reaming section stake (2), (2) at the bottom of reaming section stake are divided into expansion section (2-1) and the section of going to the bottom (2-2), in straightway pile body (1) and upper expansion section (2-1), note is filled with concrete (4), and in the section of going to the bottom (2-2), note is filled with the adhesive bond (7) that sandy gravel (5) is mixed to form with cement mortar (6).

2. rotary digging drilling hole according to claim 1 first bottom-grouting-enlarged stake, it is characterised in that described cement mortar (6) is cement mortar or neat slurry.