CN107288549A - Down-hole hammer for pile foundation engineering - Google Patents
Down-hole hammer for pile foundation engineering Download PDFInfo
- Publication number
- CN107288549A CN107288549A CN201710623648.8A CN201710623648A CN107288549A CN 107288549 A CN107288549 A CN 107288549A CN 201710623648 A CN201710623648 A CN 201710623648A CN 107288549 A CN107288549 A CN 107288549A
- Authority
- CN
- China
- Prior art keywords
- bit
- hole hammer
- balance
- bar shaped
- balance bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
Abstract
The invention discloses a kind of down-hole hammer for pile foundation engineering, including down-hole hammer body, center bit and off-balance bit；Center bit is coaxially disposed with down-hole hammer body and center bit is fixed on down-hole hammer body lower end, connecting pole by multiple connecting poles with the diameter parallel of down-hole hammer body and is rotatably set with an off-balance bit；Axially extending boss is provided with the middle part of center bit rear end；The boss is provided with the bar shaped locating piece for being used at least being positioned after off-balance bit expansion to off-balance bit；Bar shaped locating piece is resetted by back-moving spring；Off-balance bit deploys under the influence of centrifugal force, can be positioned after expansion by bar shaped locating piece, off-balance bit is fixed relative to center bit and down-hole hammer body, off-balance bit is avoided to swing, the stability of down-hole hammer is improved, is increased the service life, pile foundation engineering quality is improved.
Description
Technical field
The present invention relates to pile foundation engineering field, and in particular to a kind of down-hole hammer for pile foundation engineering.
Background technology
The construction of bored concrete pile is divided into pore-forming and pile two parts, and wherein pore-forming is -individual link in filling pile construction.
In the construction of bored concrete pile, the quality of hole quality directly influences the pile quality after concrete cast：The aperture of stake holes is inclined
The small side friction for then causing pile, pile top end bearing capacity are reduced, the bearing capacity reduction of whole stake；Stake holes top will be expanding to cause
The collateral resistance increase of pile top, and bottom collateral resistance can not be played completely, while the concrete of single pile pours fluence increase；Stake holes is inclined
Tiltedly changing stake to a certain extent vertically carries mechanical characteristic, weakens effective performance of pile bearing capacity；Pile bottom sediment mistake
Thickness causes stake is long to reduce, and ability is held at the end that pile top is then directly affected for end-bearing pile, and down-hole hammer of the prior art is generally provided with
Center bit and off-balance bit, center bit are used for punching of advancing, and off-balance bit is used to the reaming after center bit punching, eccentric
Drill bit is usually the rock stratum for deploying and cutting surrounding in the presence of the centrifugal force that rotation is produced, and can not effectively be determined after expansion
Position, therefore off-balance bit is easily swung in reaming procedure, influences the stability of whole down-hole hammer.
The content of the invention
It is therefore an object of the present invention to a kind of down-hole hammer for pile foundation engineering is provided, including center bit, off-balance bit
With the down-hole hammer body of cylinder, off-balance bit deploys, can carried out after expansion by bar shaped locating piece under the influence of centrifugal force
Positioning, makes off-balance bit be fixed relative to center bit and down-hole hammer body, it is to avoid off-balance bit is swung, and improves the steady of down-hole hammer
It is qualitative, increase the service life, improve pile foundation engineering quality.
The down-hole hammer for pile foundation engineering of the present invention, including down-hole hammer body, center bit and off-balance bit；It is described latent
Drift body is in cylinder；The center bit and down-hole hammer body be coaxially disposed and center bit by with down-hole hammer body
Multiple connecting poles of diameter parallel be fixed on down-hole hammer body lower end, each connecting pole is evenly distributed around down-hole hammer body axis,
Rotatably an off-balance bit is set with each connecting pole；Provided with axially extending in the middle part of the center bit rear end
Boss；The boss is provided with the bar shaped locating piece for being used at least being positioned after off-balance bit expansion to off-balance bit；Institute
The one end for stating bar shaped locating piece is rotationally connected with boss and the other end of bar shaped locating piece is contacted under the action of the centrifugal force accordingly
Off-balance bit is to realize positioning；Bar shaped locating piece is resetted by back-moving spring；By the positioning to off-balance bit, make off-balance bit
Original expanded angle can be kept when cutting different rock-layers, so that avoid off-balance bit from being swung because of the change of Cutting Drag,
Bar shaped locating piece is triggered under the centrifugal action that rotation is produced, when the size of centrifugal force reaches to a certain degree, off-balance bit
Expansion, while bar shaped locating piece overcomes the elastic force of back-moving spring to be turned out, rotation is followed by contacting off-balance bit to a certain extent,
The positioning to off-balance bit is realized, just can be by bar shaped locating piece to off-balance bit as long as now down-hole hammer keeps rotating speed constant
The positioning stablized.
Further, the bar shaped locating piece is capable of one end of off-balance bit contact provided with for entering to corresponding off-balance bit
The positioning convex of row positioning；Correspondence positioning convex is provided with locating groove on the off-balance bit；The position of locating groove is according to need
The angle for wanting off-balance bit to deploy is configured, and off-balance bit is expanded to after required angle, locating groove and positioning convex phase
It is right, and then realization positioning in locating groove is inserted by positioning convex.
Further, the positioning convex is shaped as trapezoidal, and the flute profile of the locating groove is also to be trapezoidal, beneficial to convex
Play the engaging and disengaging between locating groove, it is to avoid stuck.
Further, the rotating shaft of the bar shaped locating piece is parallel with connecting pole, and the rotating shaft of bar shaped locating piece is with installing phase
Answer the connecting pole of off-balance bit to be not less than 10 ° relative to the central angle at boss center, keep the center of gravity of bar shaped locating piece to fulcrum
Between have certain length, acted beneficial to bar shaped locating piece is timely, sensitive under the action of the centrifugal force.
Further, torsion spring is equipped between each connecting pole and corresponding off-balance bit, makes off-balance bit in the bullet of torsion spring
Drawn under power effect to boss, below certain rotating speed, off-balance bit can keep rounding state under elastic force effect, be turned by increasing
Speed deploys off-balance bit, easy to control.
Further, the connecting pole and off-balance bit are respectively four, compact conformation, rationally.
Further, the horizontal stroke for carrying out axially position to connecting pole is equipped with center bit and the down-hole hammer body
Pin, it is ensured that the steadiness connected between center bit and down-hole hammer body, more robust, service life is more long.
The beneficial effects of the invention are as follows：The down-hole hammer for pile foundation engineering of the present invention, including center bit, off-balance bit
With the down-hole hammer body of cylinder, off-balance bit deploys, can carried out after expansion by bar shaped locating piece under the influence of centrifugal force
Positioning, makes off-balance bit be fixed relative to center bit and down-hole hammer body, it is to avoid off-balance bit is swung, and improves the steady of down-hole hammer
It is qualitative, major diameter drilling construction is realized, is increased the service life, pile foundation engineering quality is improved.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described.In accompanying drawing, each element or part are not
It is certain to be drawn according to actual ratio.
Fig. 1 is structural representation of the invention；
Fig. 2 is off-balance bit deployed condition structural representation；
Fig. 3 is off-balance bit rounding state structural representation.
Embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Clearly illustrate technical scheme, therefore be only used as example, and the protection model of the present invention can not be limited with this
Enclose.
As shown in Figure 1, 2, 3, the down-hole hammer for pile foundation engineering of the present embodiment, including down-hole hammer body 3, center bit
1 and off-balance bit 2；The down-hole hammer body 3 is in cylinder；The center bit 1 and down-hole hammer body 3 be coaxially disposed and in
Heart drill bit 1 is fixed on the lower end of down-hole hammer body 3, each connecting pole by multiple connecting poles 4 with the diameter parallel of down-hole hammer body 3
4 is evenly distributed around the axis of down-hole hammer body 3, and rotatably an off-balance bit 2 is set with each connecting pole 4；It is described
Axially extending boss 5 is provided with the middle part of the rear end of center bit 1；The boss 5, which is provided with, to be used at least after the expansion of off-balance bit 2
The bar shaped locating piece 6 positioned to off-balance bit 2；One end of the bar shaped locating piece 6, which is rotationally connected with boss 5, determines bar shaped
The other end of position block 6 contacts corresponding off-balance bit 2 to realize positioning under the action of the centrifugal force；Bar shaped locating piece 6 is by resetting
Spring 7 resets；By the positioning to off-balance bit 2, off-balance bit 2 is set to keep original angle of spread when cutting different rock-layers
Degree, so that avoid off-balance bit 2 from being swung because of the change of Cutting Drag, the centrifugal action that bar shaped locating piece 6 is produced in rotation
Lower triggering, when the size of centrifugal force reaches to a certain degree, off-balance bit 2 deploys, while bar shaped locating piece 6 overcomes back-moving spring
7 elastic force is turned out, and rotation is followed by contacting off-balance bit 2 to a certain extent, realizes the positioning to off-balance bit 2, now only
Down-hole hammer is wanted to keep rotating speed constant, the positioning that just can be stablized by bar shaped locating piece 6 to off-balance bit 2, in position fixing process
Power suffered by bar shaped locating piece 6 is pressure or pulling force, rather than shearing force, and the compression strength and tensile strength of bar shaped locating piece 6
It is far longer than the intensity of anti-shearing force, therefore is unlikely to deform, more preferably, service life is more long for structural stability；The He of connecting pole 4
Off-balance bit 2 be respectively four, compact conformation, rationally；It is equipped with the center bit 1 and down-hole hammer body 3 for even
Connect the lateral pin 9 that post 4 carries out axially position, it is ensured that the steadiness connected between center bit 1 and down-hole hammer body 3, it is more robust, make
It is more long with the life-span, torsion spring 8 is equipped between each connecting pole 4 and corresponding off-balance bit 2, makes off-balance bit 2 in the bullet of torsion spring 8
Drawn under power effect to boss 5, below certain rotating speed, off-balance bit 2 can keep rounding state under elastic force effect, by increasing
Rotating speed deploys off-balance bit 2, easy to control.
In the present embodiment, one end that the bar shaped locating piece 6 is capable of the contact of off-balance bit 2 is provided with for corresponding eccentric
The positioning convex that drill bit 2 is positioned；Correspondence positioning convex is provided with locating groove on the off-balance bit 2；The position of locating groove
The angle that off-balance bit 2 as needed deploys is put to be configured, make off-balance bit 2 be expanded to needed for after angle, locating groove with
Positioning convex is relative, and then inserts realization positioning in locating groove by positioning convex；Being shaped as the positioning convex is trapezoidal,
The flute profile of the locating groove is also trapezoidal, beneficial to the engaging and disengaging between positioning convex and locating groove, it is to avoid stuck；Institute
The rotating shaft for stating bar shaped locating piece 6 is parallel with connecting pole 4, and the company of the rotating shaft off-balance bit 2 corresponding to installation of bar shaped locating piece 6
The central angle that post 4 is connect relative to the center of boss 5 is not less than 10 °, keeps the center of gravity of bar shaped locating piece 6 to there is a fixed length between fulcrum
Degree, is acted beneficial to bar shaped locating piece 6 is timely, sensitive under the action of the centrifugal force.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme, it all should cover among the claim of the present invention and the scope of specification.
Claims (7)
1. a kind of down-hole hammer for pile foundation engineering, it is characterised in that：Including down-hole hammer body, center bit and off-balance bit；
The down-hole hammer body is in cylinder；The center bit and down-hole hammer body be coaxially disposed and center bit by with down-the-hole
The multiple connecting poles for hammering the diameter parallel of body into shape are fixed on down-hole hammer body lower end, and each connecting pole is uniform around down-hole hammer body axis
Rotatably an off-balance bit is set with arrangement, each connecting pole；Provided with axially in the middle part of the center bit rear end
The boss of extension；The boss is provided with the bar shaped positioning for being used at least position off-balance bit after off-balance bit expansion
Block；One end of the bar shaped locating piece, which is rotationally connected with boss, makes the other end of bar shaped locating piece contact phase under the action of the centrifugal force
The off-balance bit answered is to realize positioning；Bar shaped locating piece is resetted by back-moving spring.
2. the down-hole hammer according to claim 1 for pile foundation engineering, it is characterised in that：The bar shaped locating piece can be inclined
One end of heart bit contact is provided with the positioning convex for being used for being positioned to corresponding off-balance bit；Correspondence on the off-balance bit
Positioning convex is provided with locating groove.
3. the down-hole hammer according to claim 2 for pile foundation engineering, it is characterised in that：The positioning convex is shaped as
Trapezoidal, the flute profile of the locating groove is also to be trapezoidal.
4. the down-hole hammer according to claim 3 for pile foundation engineering, it is characterised in that：The rotating shaft of the bar shaped locating piece
It is parallel with connecting pole, and circle of the connecting pole relative to boss center of rotating shaft and the corresponding off-balance bit of installation of bar shaped locating piece
Heart angle is not less than 10 °.
5. the down-hole hammer according to claim 4 for pile foundation engineering, it is characterised in that：Each connecting pole with it is corresponding inclined
Torsion spring is equipped between heart drill bit, off-balance bit is drawn under the elastic force effect of torsion spring to boss.
6. the down-hole hammer according to claim 5 for pile foundation engineering, it is characterised in that：The connecting pole and off-balance bit
Respectively four.
7. the down-hole hammer according to claim 1 for pile foundation engineering, it is characterised in that：The center bit and down-hole hammer
The lateral pin for carrying out axially position to connecting pole is equipped with body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710623648.8A CN107288549A (en) | 2017-07-27 | 2017-07-27 | Down-hole hammer for pile foundation engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710623648.8A CN107288549A (en) | 2017-07-27 | 2017-07-27 | Down-hole hammer for pile foundation engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107288549A true CN107288549A (en) | 2017-10-24 |
Family
ID=60103350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710623648.8A Pending CN107288549A (en) | 2017-07-27 | 2017-07-27 | Down-hole hammer for pile foundation engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107288549A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201546617U (en) * | 2009-12-08 | 2010-08-11 | 中国地质科学院探矿工艺研究所 | Three-piece air down-the-hole hammer eccentric following drill connected with elastic cylindrical pin assembly |
| CN102383726A (en) * | 2011-07-11 | 2012-03-21 | 中国地质科学院探矿工艺研究所 | Air down-the-hole hammer centering casing drill |
| CN102787806A (en) * | 2012-08-20 | 2012-11-21 | 中国地质科学院探矿工艺研究所 | Concentric pipe-following drilling tool |
| CN103046871A (en) * | 2012-12-30 | 2013-04-17 | 中北大学 | Hydra-mechanical reducing bit broaching while drilling |
| JP2013122112A (en) * | 2011-12-09 | 2013-06-20 | Mitsubishi Materials Corp | Excavation tool |
| CN203296682U (en) * | 2013-04-19 | 2013-11-20 | 耿晓西 | Down-the-hole hammer |
-
2017
- 2017-07-27 CN CN201710623648.8A patent/CN107288549A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201546617U (en) * | 2009-12-08 | 2010-08-11 | 中国地质科学院探矿工艺研究所 | Three-piece air down-the-hole hammer eccentric following drill connected with elastic cylindrical pin assembly |
| CN102383726A (en) * | 2011-07-11 | 2012-03-21 | 中国地质科学院探矿工艺研究所 | Air down-the-hole hammer centering casing drill |
| JP2013122112A (en) * | 2011-12-09 | 2013-06-20 | Mitsubishi Materials Corp | Excavation tool |
| CN102787806A (en) * | 2012-08-20 | 2012-11-21 | 中国地质科学院探矿工艺研究所 | Concentric pipe-following drilling tool |
| CN103046871A (en) * | 2012-12-30 | 2013-04-17 | 中北大学 | Hydra-mechanical reducing bit broaching while drilling |
| CN203296682U (en) * | 2013-04-19 | 2013-11-20 | 耿晓西 | Down-the-hole hammer |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171024 |
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| RJ01 | Rejection of invention patent application after publication |