CN106088088A - The stress decentralized stiffening pile of recyclable dowel and construction method thereof - Google Patents
The stress decentralized stiffening pile of recyclable dowel and construction method thereof Download PDFInfo
- Publication number
- CN106088088A CN106088088A CN201610642167.7A CN201610642167A CN106088088A CN 106088088 A CN106088088 A CN 106088088A CN 201610642167 A CN201610642167 A CN 201610642167A CN 106088088 A CN106088088 A CN 106088088A
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- China
- Prior art keywords
- dowel
- anchoring
- supporting body
- prestressing force
- traction
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The present invention provides the stress decentralized stiffening pile of a kind of recyclable dowel, comprises: anchoring body, prestressing force dowel, traction dowel and supporting body.Anchoring body is jet mixing soil-cement body or the cement mortar body of a major diameter；Supporting body is pushed in anchoring body by drilling rod；After anchoring body maintenance reaches design strength, to the construction prestressing force locking of prestressing force dowel；After anchoring mission completes, fixture is pulled in the cavity of supporting body by stretch-draw traction dowel, and prestressing force dowel is disconnected with supporting body；Traction machine is used all to reclaim out from the stratum of anchoring by dowel.Present invention also offers the construction method of this stiffening pile.The present invention constructs the dispersion of workable, stress, produces anchor force relatively big in weak soil, and anchoring reliability is high, and the response rate of dowel is high, high construction efficiency.Dowel and anchorage recycling, reduce engineering and make, remove underground obstacle, it is achieved that the greenization of anchoring construction technology.
Description
Technical field
The present invention relates to technical field of civil engineering, particularly to the support pile used in Deep Foundation Pit Supporting Project.
Background technology
In the most conventional side slope and Deep Foundation Pit Supporting Project, prestress anchorage cable has higher anchor force, the stake of formation
Anchor supporting construction is widely applied.But soft soil layer anchoring is the bottleneck of anchorage technology, because the frictional resistance of soft soil layer
Low, it is easily generated rheology, these all limit the application of anchorage technology.In addition prestressing force dowel uses steel strand wires, in side slope
After completing mission with foundation pit enclosure structure, often stay and form barrier in underground, which also limits the application of this kind of support form.
To this end, form higher anchor force in soft soil layer, control the deflection of its weak soil, and complete it in supporting construction mission
After, can reclaim out by dowel from the soil body, be an engineering circles difficult problem in the urgent need to address.
For soft soil layer, owing to the water content of weak soil is big, water level is the highest, and dowel all locates below level of ground water.When
During Shi Hanzhang, traditional anchoring body diameter only has 100～150mm, less with the bond area of weak soil, in addition the rubbing of weak soil
Resistance is relatively low, and the anchor force obtained should be relatively low.Additionally, the rheological property of soft soil layer, when the prestressing force applied is higher, stratum
Rheological Deformation characteristic just show substantially, lead Deformation control effect relatively low.
Owing to the construction period requires tight, the curing period that general anchor rod anchored physical ability gives, is the shortest, strong at anchoring body
When spending relatively low state, it is necessary to dowel therein carries out stretch-draw, anchoring body is usually made to be damaged by tension and compression.Less pre-when applying
During stress, the control effect of deformation is the poorest.Accordingly, it would be desirable to anchor pole (rope) technology that research and development have higher anchor force is soft to meet
The requirement of soil supporting.
From the point of view of the technical standard of current anchor pole (rope) supporting and the recovery technology level of anchor pole (rope), these recovery types
Bolt support technology, is suitable for the most under certain conditions, as in rock and hard stratum, in the soil layer more than level of ground water
Can application.From the point of view of current applicable cases, the response rate of anchor pole (rope) is the highest, typically can only achieve 50%, and different
There are some problems in degree ground, such as: construction technology is numerous and diverse, labor strength is big, reclaim needed for equipment complexity is heavy, recovery
Rate is relatively low.
For a kind of Recyclable anchor rope with enlarged footing anchor pole as representative, produce stress at enlarged footing and concentrate, on weak soil ground
In Ceng, at enlarged footing, deformation and rheology are bigger, and the control to anchorage deformation is difficult.This anchor cable is by the steel of non-binding
Twisted wire is around across on the carrier, and when the length of anchor cable is more than 20m, the resistance overcome when reclaiming anchor cable is equal to 2 times of anchor cable length *
The frictional resistance of its unit length, extraction of need to turning round on U-shaped supporting body, total resistance that reclaims of generation has been likely larger than single anchor cable
Limit stretching force, tensile phenomenon occurs, causes anchor cable all to reclaim.
The electric heating melting used at present unlocks the method reclaimed, and due to anchor cable, to be embedded in the underground time longer, and anchorage cable stretching becomes
Shape is relatively big, the wire of energising may be made to be pulled off, it is impossible to electrified regulation, produces the phenomenon that cannot unlock.
Dismountable anchor cable and construction technology thereof, patent of invention number 201210485262.2, use the method unlocked to realize tearing open
Unloading anchor cable, find out from Fig. 2 of its description, it is indoor that the anchor cable front portion of card locking is positioned at a big spherical hollow space, its card
Not retraining with anchor cable, in installation process, when by axial compressive force effect, it is de-that anchor cable drives card to be easy to from lockhole
Open, make work failure of cable.This kind of anchor cable occurs in that work failure of cable case in mono-pattern foundation pit supporting structure of Shenzhen Qian Hai, occurs
The Important Project security incident that foundation ditch all collapses, this accident video spreads in the whole country, cause capital construction commission of Shenzhen to send the documents
Disable this kind of anchor cable, it was demonstrated that this kind of anchor cable work unreliable.Further, since anchor head is wrapped around in anchoring body, anchoring body
For soil cement or cement mortar body, can find from this patent Fig. 2, unlocking fixture block and be followed by bearing plate, the fixture block unlocking pull-out is
Do not have position to move, fixture block be moved, it is necessary to bearing plate is moved together, and extrusion space could solve in anchoring body
Lock, the pulling force of this unblock is very big, may be broken by drag-line, it is impossible to dismounting anchor cable.Outside it, the recovery line in this patent and unblock
Connection between fixture block is Hard link (welding), or bonding, after pull-out unlocks fixture block, is difficult to free between recovery line and fixture block,
The reliability reclaiming anchor cable is poor.In weak soil, the anchor cable of many soap-free emulsion polymeization is positioned on an anchor head, after Shi Hanzhang, and will
Anchoring body (soil cement or cement mortar body) can be made damaged, cause fastening invalidation.
The anchor head of this patent there is also an issue, i.e. when anchor cable is through bearing plate, between anchor cable and anchor head cavity
Seal approach is not show, in such high-pressure fluid environment, cement mortar, mud will enter into anchor head along anchor cable edge
In, dismounting anchor head operation failure can be made.
In order to improve in soft soil layer, it is thus achieved that bigger anchor force, effectively control deformation, improve the response rate and ensure anchor
Guan County is complete, in the urgent need to developing the prestressed anchor fixing structure of a kind of recyclable dowel, to realize the whole of anchoring safety and dowel
Reclaim.
Summary of the invention
The technical problem to be solved is, overcome that existing anchor pole (rope) anchor force is relatively low, anchorage deformation is big and
Dowel reclaims the technical problem and fault of construction existed, it is provided that one both provided higher anchor force, effectively controlled deformation, again can be square
Just reclaim the stress decentralized stiffening pile of the recyclable dowel of anchor cable, also provide for the construction method of this stiffening pile simultaneously.In supporting
After having acted on, can reclaim out from the soil body by dowel, make anchoring body depart from dowel, it is achieved the recycling of dowel,
Barrier in the earth formation is stayed in removing, reduces the purpose of construction costs.
The technical scheme is that such to solve the problems referred to above:
The stress decentralized stiffening pile of recyclable dowel, comprises: anchoring body, is provided with prestressing force dowel, traction in anchoring body
Dowel and supporting body, supporting body is cylindrical, the symmetrical a pair prominent earrings of outer rim；Supporting body upper cover is for holding out against prestressing force
Dowel and the plectane of locking plate, lock fixture block and hold out against the mutual wedgewise of fixture block, and prestressing force dowel is anchored at carrying by locking plate symmetry
Seat is with on locking fixture block, and traction dowel is anchored at by locking plate and middle holds out against in fixture block, and bottom is a cavity body；Prestressing force
Dowel and traction dowel are the steel strand wires of soap-free emulsion polymeization.
Anchoring body is jet mixing soil-cement body or the cement mortar body of a major diameter, and its diameter is more than 150mm, length
More than 3m.The anchoring body of major diameter adds the contact area of anchoring body and soft soil layer, although the frictional resistance of weak soil is the highest, but
Bigger contact area can obtain higher anchor force, provides condition for obtaining bigger anchor force.
Supporting body is made up of high strength plastics or steel, uses a traction dowel to be connected on one between multiple supporting bodies
Body, the prestressing force dowel in previous supporting body passes from the earrings hole outside later supporting body.
Being a cavity sealed by sealing member in supporting body, prestressing force dowel and traction dowel pass in and out position from supporting body
Install a prominent round platform sealing device.
Connect a dispersion after supporting body, the active force that supporting body transmission comes is disperseed by longer dispersion
In anchoring body；Dispersion is cylinder cage structure, is made up of high strength plastics.Described dispersion is for anchor in soft soil layer
The dispersion measure that solid intensity is relatively low and takes, dispersion is installed on after supporting body, is made up of high strength plastics, in cylinder
Cage, the active force that supporting body transmission is come, by contact surface bigger between self and anchoring body, distribute it to anchoring body
In, in order to avoid anchoring body stress concentration causes damaged；
The anchorage intermediate arrangement that prestressing force dowel locks on Guan Liang or waist rail one draws the hole of traction anchor cable.
The construction method of the stress decentralized stiffening pile of recyclable dowel is as follows:
(1) with jet mixing rig or roof-bolter, the stratum of anchoring forms oblique a, soil cement for major diameter
Or cement mortar stiffening pile anchoring body；
(2) install prestressing force dowel and traction dowel at supporting body, and carry out distinguishing mark.
(3) U-shaped spray head is connected with drilling rod, makes two whitewashing mouths of U-shaped spray head penetrate two ears of supporting body
In Huan Yuan hole；
(4) utilize the thrust of drilling rod, supporting body is pushed in the anchoring body that will be formed, push process whitewashing drag reduction, take out
Go out drilling rod process reinforcing of whitewashing, to improve intensity and the degree of compaction of anchoring body；
(5) when the soil cement anchoring body maintenance of major diameter reaches the intensity that design requires, combination jack pair is used not
With the dowel Shi Hanzhang of length, it is locked on Guan Liang or the waist rail of supporting construction with anchorage；
(6) after supporting construction mission completes, first draw dowel with punching jack tension, fixture block will be held out against and be pulled into and hold
In the cavity of carrier, the locking plate of prestressing force dowel and locking fixture block disengage, and make prestressing force dowel be disconnected with supporting body；
(7) unlock the anchorage on Guan Liang or waist rail, uses traction machine by prestressing force dowel together with traction dowel
Reclaim out from the stratum of anchoring.
The described steel strand wires that prestressing force dowel is soap-free emulsion polymeization, are arranged in supporting body evenly；Steel strand wires are continuously without knot
Point；The prestressing force applying prestressing force dowel is delivered on supporting body, by the anchoring body of supporting body outer wrapping to outside stratum
Dispersion.
Beneficial effect: owing to its pulling force unlocked is much smaller than the pull-off force of every steel strand wires, easily realize safety mechanical
Unlock.Reclaiming the length length equal to anchoring of pull-out anchor cable, the resistance of recovery does not has superposition.The time reclaimed is contracted significantly
Short, the response rate reaches more than 99%.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the accompanying drawings with detailed description of the invention；
Fig. 1 is the stress decentralized stiffening pile structural representation of recyclable dowel of the present invention.
Fig. 2 is the internal structure section of the supporting body of the stress decentralized stiffening pile of recyclable dowel of the present invention
Figure.
Fig. 3 is the internal structure plane of the supporting body of the stress decentralized stiffening pile of recyclable dowel of the present invention
Figure.
Fig. 4 is that the supporting body of the stress decentralized stiffening pile of recyclable dowel of the present invention is illustrated with dispersion compositions
Figure
Fig. 5 is that the series connection supporting body of the stress decentralized stiffening pile of recyclable dowel of the present invention pushes entrance anchoring
Body process schematic
Fig. 6 is to unlock schematic diagram during the dowel recovery of the stress decentralized stiffening pile of recyclable dowel of the present invention.
Fig. 7 is that the prestressing force locking anchorage plane of the stress decentralized stiffening pile of recyclable dowel of the present invention is shown
It is intended to.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below knot
Conjunction is specifically illustrating, and the present invention is expanded on further.
Stiffening pile structure in the present embodiment is as it is shown in figure 1, substep has applied.Both can in harder soil layer shape
Become, be provided that the anchor force of more than 500KN, it is possible to formed in weak soil layer is such as muck soil, it is provided that the anchor of more than 300KN
Gu power, after completing support action, dowel can be reclaimed completely.
(1) with jet mixing rig or roof-bolter, formed in the stratum 16 needing anchoring one oblique, major diameter
Soil cement or cement mortar stiffening pile anchoring body 1；
(2) install prestressing force dowel 2 and traction dowel 9 at supporting body 3, use between locking fixture block 61 and load bearing seat 62
Locking plate 4 locks prestressing force dowel 2；Holding out against fixture block 6 centre locking plate 4 locking traction dowel 9, as shown in Figures 2 and 3；Locking
Fixture block 61 and hold out against fixture block 6 reverse wedge shape each other, is assembled by polylith.Need to carry out between prestressing force dowel 2 and traction dowel 9
Distinguishing mark.
(3) it is the active force that transmitted by supporting body of dispersion for soft soil layer, after supporting body 3, installs one point additional
A prose style free from parallelism 17, such as Fig. 4.
(4) U-shaped spray head 14 is connected with drilling rod 13, makes two whitewashing mouths 15 of U-shaped spray head penetrate supporting body 3
In hole, two earrings 10 gardens, as shown in Figure 5；
(4) utilizing the thrust of drilling rod 13, be pushed to by supporting body 3 in the anchoring body 1 that will be formed, the whitewashing of propelling movement process subtracts
Resistance, extracts drilling rod process reinforcing of whitewashing out, to improve intensity and the degree of compaction of anchoring body；Supporting body 3 is a hermetic knot
Structure, plectane 5 above and cavity cap 7 below all realize sealing by sealing member 8, arrange during the turnover supporting body of dowel simultaneously
Round table-like sealing device 11, as in figure 2 it is shown, the serosity so guaranteed in work progress can not penetrate into the inside of supporting body 3.
(5) when soil cement anchoring body 1 maintenance of major diameter reaches the intensity that design requires, combination jack pair is used not
With the dowel Shi Hanzhang of length, it is locked on Guan Liang or the waist rail of supporting construction with anchorage 12, as shown in Figure 1；In order to allow
Traction dowel is drawn, and sets a hole at anchorage center, as shown in Figure 7.
(6) after supporting construction mission completes, first draw dowel 9 with punching jack tension, make to hold out against fixture block 6 and locking
Fixture block 61 departs from, and holds out against fixture block 6 and is connected in the cavity 7 being pulled into supporting body with traction dowel 9, the locking plate 4 of prestressing force dowel 2
Naturally disengage with locking fixture block 61, make prestressing force dowel 2 be disconnected with supporting body 3, as shown in Figure 6；
(7) unlock the anchorage 12 on Guan Liang or waist rail, uses traction machine by prestressing force dowel 2 and traction dowel 9
Reclaim out together from the stratum 16 of anchoring.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these become
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and
Equivalent defines.
Claims (7)
- The stress decentralized stiffening pile of the most recyclable dowel, comprises: anchoring body, is provided with prestressing force dowel, traction anchor in anchoring body Muscle and supporting body, it is characterised in that supporting body is cylindrical, the symmetrical a pair prominent earrings of outer rim；Supporting body upper cover is Holding out against the plectane of prestressing force dowel and locking plate, lock fixture block and hold out against the mutual wedgewise of fixture block, prestressing force dowel is symmetrical by locking plate Being anchored at load bearing seat with on locking fixture block, traction dowel is anchored at by locking plate and middle holds out against in fixture block, and bottom is a sky Cavity；Prestressing force dowel and traction dowel are the steel strand wires of soap-free emulsion polymeization.
- The stress decentralized stiffening pile of recyclable dowel the most according to claim 1, it is characterised in that anchoring body is one The jet mixing soil-cement body of major diameter or cement mortar body, its diameter is more than 150mm, and length is more than 3m.
- The stress decentralized stiffening pile of recyclable dowel the most according to claim 1, it is characterised in that supporting body is by height Strong plastics or steel are made, and use a traction dowel to be connected on one between multiple supporting bodies, pre-in previous supporting body Stress dowel passes from the earrings hole outside later supporting body.
- The stress decentralized stiffening pile of recyclable dowel the most according to claim 1, it is characterised in that be one in supporting body The individual cavity sealed by sealing member, prestressing force dowel and traction dowel are provided with a prominent round platform from supporting body turnover position Sealing device.
- 5. according to the stress decentralized stiffening pile of the recyclable dowel described in right 1, it is characterised in that connect one after supporting body Dispersion, is distributed to the active force that supporting body transmission comes in anchoring body by longer dispersion；Dispersion is cylinder Cage structure, is made up of high strength plastics.
- The stress decentralized stiffening pile of recyclable dowel the most according to claim 1, it is characterised in that prestressing force dowel exists On Guan Liang or waist rail, the anchorage intermediate arrangement one of locking draws the hole of traction anchor cable.
- The construction method of the stress decentralized stiffening pile of the most recyclable dowel is as follows:(1) with jet mixing rig or roof-bolter, the stratum of anchoring forms oblique a, soil cement for major diameter or water Cement mortar stiffening pile anchoring body；(2) install prestressing force dowel and traction dowel at supporting body, and carry out distinguishing mark；(3) U-shaped spray head is connected with drilling rod, makes two whitewashing mouths of U-shaped spray head penetrate two earrings gardens of supporting body Kong Zhong；(4) utilize the thrust of drilling rod, supporting body is pushed in the anchoring body that will be formed, push process whitewashing drag reduction, extract out and bore Bar process reinforcing of whitewashing, to improve intensity and the degree of compaction of anchoring body；(5) when the soil cement anchoring body maintenance of major diameter reaches the intensity that design requires, use combination jack pair difference long The dowel Shi Hanzhang of degree, is locked on Guan Liang or the waist rail of supporting construction with anchorage；(6) after supporting construction mission completes, first draw dowel with punching jack tension, fixture block will be held out against and be pulled into supporting body Cavity in, the locking plate of prestressing force dowel and locking fixture block disengage, make prestressing force dowel be disconnected with supporting body；(7) unlock the anchorage on Guan Liang or waist rail, uses traction machine by prestressing force dowel and to draw together with dowel from anchor Solid stratum in reclaim out.
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| CN201610642167.7A CN106088088B (en) | 2016-08-08 | 2016-08-08 | The construction method of the stress dispersing type stiffening pile of recyclable dowel |
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| CN201610642167.7A CN106088088B (en) | 2016-08-08 | 2016-08-08 | The construction method of the stress dispersing type stiffening pile of recyclable dowel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677177A (en) * | 2017-01-10 | 2017-05-17 | 上海强劲地基工程股份有限公司 | Anchoring part with recyclable anchor bars |
| CN108018858A (en) * | 2017-12-14 | 2018-05-11 | 上海智平基础工程有限公司 | A kind of detachable prestressed anchor cable anchorage |
| CN108894221A (en) * | 2018-09-25 | 2018-11-27 | 兰州理工大学 | Reinforced anchor bolt and its recovery method can be recycled in two generation hands |
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| CN101235645A (en) * | 2007-01-30 | 2008-08-06 | 李乐 | Reclaiming type anchor bar |
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| CN103046546A (en) * | 2012-11-23 | 2013-04-17 | 浙江中桥预应力设备有限公司 | Detachable anchor cable and construction process thereof |
| CN204370419U (en) * | 2014-12-19 | 2015-06-03 | 姚炳祥 | Removable pressure-type anchor head |
| CN204645035U (en) * | 2015-04-03 | 2015-09-16 | 霍炳旭 | A kind of carrying support body disperseing anchor cable pressure |
| CN205875150U (en) * | 2016-08-08 | 2017-01-11 | 上海强劲地基工程股份有限公司 | Stake of putting more energy into of stress dispersion type of recoverable dowel |
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| JPH10176328A (en) * | 1996-12-18 | 1998-06-30 | V S L Japan Kk | Removal anchor |
| CN101235645A (en) * | 2007-01-30 | 2008-08-06 | 李乐 | Reclaiming type anchor bar |
| CN102677670A (en) * | 2011-03-11 | 2012-09-19 | 王立明 | Dismountable-anchor type recoverable anchor rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106677177A (en) * | 2017-01-10 | 2017-05-17 | 上海强劲地基工程股份有限公司 | Anchoring part with recyclable anchor bars |
| CN108018858A (en) * | 2017-12-14 | 2018-05-11 | 上海智平基础工程有限公司 | A kind of detachable prestressed anchor cable anchorage |
| CN108894221A (en) * | 2018-09-25 | 2018-11-27 | 兰州理工大学 | Reinforced anchor bolt and its recovery method can be recycled in two generation hands |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106088088B (en) | 2018-11-20 |
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