CN106088088B - The construction method of the stress dispersing type stiffening pile of recyclable dowel - Google Patents
The construction method of the stress dispersing type stiffening pile of recyclable dowel Download PDFInfo
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- CN106088088B CN106088088B CN201610642167.7A CN201610642167A CN106088088B CN 106088088 B CN106088088 B CN 106088088B CN 201610642167 A CN201610642167 A CN 201610642167A CN 106088088 B CN106088088 B CN 106088088B
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- dowel
- prestressing force
- anchoring
- supporting body
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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
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- 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
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention provides a kind of stress dispersing type stiffening pile of recyclable dowel, includes：Anchoring body, prestressing force dowel, traction dowel and supporting body.Anchoring body is the jet mixing soil-cement body or 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 the completion of anchoring mission, tensioning traction dowel pulls in fixture in the cavity of supporting body, and prestressing force dowel is disconnected with supporting body；Dowel is all recycled from the stratum of anchoring using dragger and is come out.The present invention also provides the construction methods of the stiffening pile.Present invention construction strong operability, stress dispersion, generation anchor force is larger in weak soil, and anchoring reliability is high, the rate of recovery height of dowel, high construction efficiency.Dowel and anchorage recycling and reusing reduce engineering and make, and remove underground obstacle, realize the greenization of anchoring construction technology.
Description
Technical field
The present invention relates to technical field of civil engineering, in particular to support pile used in Deep Foundation Pit Supporting Project.
Background technique
In currently used side slope and Deep Foundation Pit Supporting Project, prestress anchorage cable anchor force with higher, the stake of formation
Anchor supporting construction is widely applied.But soft soil layer anchoring is the bottleneck of anchorage technology, because of the frictional resistance of soft soil layer
It is low, it is also easy to produce rheology, these all limit the application of anchorage technology.Furthermore prestressing force dowel is using steel strand wires, in side slope
After completing mission with foundation pit enclosure structure, often stays and form barrier in underground, which also limits the applications of this kind of support form.
For this purpose, forming higher anchor force in soft soil layer, the deflection of its weak soil is controlled, and complete it in supporting construction mission
Afterwards, dowel can be recycled out from the soil body, is engineering circles problem in the urgent need to address.
For soft soil layer, since the water content of weak soil is big, water level is generally higher, and dowel locates level of ground water or less.When
When applying prestressing force, traditional anchoring body diameter only has 100~150mm, smaller with the bond area of weak soil, and weak soil rubs in addition
Resistance is lower, and obtained anchor force is answered lower.In addition, the rheological property of soft soil layer, when the prestressing force of application is higher, stratum
Rheological Deformation characteristic just show obviously, it is lower to lead deformation control effect.
Since the construction period requires tightly, the curing period that general anchor rod anchored physical efficiency is given, is also shorter, in the strong of anchoring body
When degree is compared with low state, it is necessary to carry out tensioning to dowel therein, usually anchoring body be damaged by tension and compression.It is smaller pre- when applying
When stress, the control effect of deformation is with regard to poor.It is soft to meet therefore, it is necessary to research and develop anchor pole (rope) technology of anchor force with higher
The requirement of native supporting.
From the point of view of the current technical standard of anchor pole (rope) supporting and the recovery technology level of anchor pole (rope), these recovery types
Bolt support technology is applicable under certain conditions, such as in rock and hard stratum, in the soil layer more than level of ground water
It can apply.From the point of view of current applicable cases, the rate of recovery of anchor pole (rope) is not generally high, generally can only achieve 50%, and different
Degree there are some problems, such as：Heavy, recycling that construction technology is many and diverse, labor intensity of workers is big, the device is complicated needed for recycling
Rate is more low.
It generates stress for a kind of using enlarged footing anchor pole as the Recyclable anchor rope of representative, at enlarged footing to concentrate, in weak soil
In layer, deformation and rheology are biggish at enlarged footing, are difficult to the control of anchorage deformation.The 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 greater than 20m, the resistance overcome when recycling anchor cable is equal to 2 times of anchor cable length *
The frictional resistance of its unit length, need to turn round extraction on U-shaped supporting body, and total recycling resistance of generation has been likely larger than single anchor cable
Limit stretching force, there is tensile phenomenon, anchor cable caused not recycle all.
The method of currently used electric heating melting unlock recycling, since anchor cable is embedded in, the underground time is longer, and anchorage cable stretching becomes
Shape is larger, and the conducting wire being powered may be made to be pulled off, can not electrified regulation, the phenomenon that generation can not unlock.
Dismountable anchor cable and its construction technology, patent of invention number 201210485262.2 are torn open using the method realization of unlock
Anchor cable is unloaded, is found out from Fig. 2 of its specification, the anchor cable front of card locking is located in one big spherical hollow space room, card
It is not constrained with anchor cable, during the installation process, when being acted on by axial compressive force, anchor cable drives card to be easy to take off from lockhole
It opens, makes work failure of cable.There is work failure of cable case in mono- pattern foundation pit supporting structure of Shenzhen Qian Hai in this kind of anchor cable, occurs
The Important Project safety accident that foundation pit all collapses, the accident video are spread in the whole country, and capital construction commission of Shenzhen is caused to send the documents
Disable this kind of anchor cable, it was demonstrated that this kind of anchor cable work it is unreliable.In addition, since anchor head is wrapped around in anchoring body, anchoring body
It for soil cement or cement mortar body, can be found from patent Fig. 2, unlock fixture block is followed by bearing plate, and the fixture block for unlocking pull-out is
There is no position movement, it is fixture block is mobile, it is necessary to move together bearing plate, and extrusion space could solve in anchoring body
Lock, the pulling force of this unlock is very big, may break drag-line, can not dismantle anchor cable.Recovery line and unlock outside it, in the patent
Connection between fixture block is Hard link (welding), or bonding, after pulling out unlock fixture block, is difficult to free between recovery line and fixture block,
The reliability for recycling anchor cable is poor.In weak soil, the anchor cable of more soap-free emulsion polymeizations is located on an anchor head, will after applying prestressing force
Anchoring body (soil cement or cement mortar body) can be made damaged, lead to fastening invalidation.
The anchor head of the patent there is also an issue, i.e., when anchor cable passes through bearing plate, between anchor cable and anchor head cavity
Seal approach is not show, in such high-pressure fluid environment, cement slurry, mud will enter anchor head along anchor cable edge
It is interior, it can make to dismantle anchor head operation failure.
In order to improve in soft soil layer, biggish anchor force is obtained, effectively control deformation improves the rate of recovery and guarantees anchor
Guan County is complete, there is an urgent need to develop a kind of prestressed anchor fixing structure of recyclable dowel, to realize the whole of anchoring safety and dowel
Recycling.
Summary of the invention
Technical problem to be solved by the present invention lies in, overcome that existing anchor pole (rope) anchor force is lower, anchorage deformation is big and
Dowel recycling and fault of construction provide one kind and both provided higher anchor force, effectively control deformation, and energy side
Just the stress dispersing type stiffening pile of the recyclable dowel of anchor cable is recycled, while the construction method of the stiffening pile being also provided.In supporting
After effect is completed, dowel can be recycled from the soil body and be come out, be detached from anchoring body and dowel, realize the recycling of dowel,
Barrier in the earth formation is stayed in removing, achievees the purpose that reduce project cost.
It is to solve the above-mentioned problems the technical scheme is that such：
The stress dispersing type stiffening pile of recyclable dowel includes：Anchoring body, anchoring body is interior to be equipped with prestressing force dowel, traction
Dowel and supporting body, supporting body are cylinder, the symmetrical a pair earrings outstanding of outer rim；Supporting body upper cover is to hold out against prestressing force
The plectane of dowel and locking plate, locking fixture block are symmetrically anchored at carrying by locking plate with the mutual wedgewise of fixture block, prestressing force dowel is held out against
Seat on locking fixture block, traction dowel by locking plate be anchored at it is intermediate hold out against in fixture block, lower part is a cavity body, and tensioning is led
When drawing dowel, holds out against fixture block and drop in the cavity body；Prestressing force dowel and traction dowel are the steel strand wires of soap-free emulsion polymeization.
Anchoring body is the jet mixing soil-cement body or cement mortar body of a major diameter, has a diameter larger than 150mm, length
Greater than 3m.The anchoring body of major diameter increases the contact area of anchoring body and soft soil layer, although the frictional resistance of weak soil is not high,
The biggish available higher anchor force of contact area provides condition to obtain larger anchor force.
Supporting body is made of high strength plastics or steel, is connected on one using a traction dowel between multiple supporting bodies
Body, the prestressing force dowel in previous supporting body are passed through from the earrings hole outside the latter supporting body.
It is the cavity sealed by sealing element in supporting body, prestressing force dowel and traction dowel pass in and out position from supporting body
A rotary table sealing device outstanding is installed.
A dispersion is connected after supporting body, and the active force that supporting body transmitting comes is given by longer dispersion and is dispersed
Into anchoring body；Dispersion is in cylinder cage structure, is made of high strength plastics.The dispersion is for anchor in soft soil layer
The dispersion measure that solid intensity is lower and takes, dispersion is installed on behind supporting body, is made of high strength plastics, cylindrical
Cage, by supporting body transmitting come active force, by itself between anchoring body biggish contact surface, distribute it to anchoring body
In, in case anchoring body stress concentration causes to be damaged；
The hole for the anchorage intermediate arrangement one extraction traction anchor cable that prestressing force dowel locks in crown beam or waist rail.
The construction method of the stress dispersing type stiffening pile of recyclable dowel is as follows：
(1) jet mixing drilling machine or roof-bolter are used, forms slanting, major diameter a soil cement in the stratum of anchoring
Or cement mortar stiffening pile anchoring body；
(2) prestressing force dowel and traction dowel are installed in supporting body, and carries out distinguishing mark.
(3) U-shaped spray head is connected with drilling rod, two mouths of whitewashing of U-shaped spray head is made to penetrate two ears of supporting body
In the hole Huan Yuan；
(4) thrust for utilizing drilling rod, supporting body is pushed in the anchoring body by formation, and push process whitewashing drag reduction is taken out
Drilling rod process and reinforcing of whitewashing out, to improve the intensity and compactness of anchoring body；
(5) when the maintenance of the soil cement anchoring body of major diameter reaches the intensity of design requirement, not using combination jack pair
Dowel with length applies prestressing force, is locked in the crown beam or waist rail of supporting construction with anchorage；
(6) after the completion of supporting construction mission, dowel first is drawn with punching jack tension, fixture block will be held out against pulls in and hold
In the cavity of carrier, the locking plate and locking fixture block of prestressing force dowel are disengaged, and are disconnected prestressing force dowel with supporting body；
(7) anchorage to unlock in crown beam or waist rail by prestressing force dowel and draws dowel together using dragger
It recycles and comes out from the stratum of anchoring.
The prestressing force dowel is the steel strand wires of soap-free emulsion polymeization, is evenly arranged in supporting body；Steel strand wires are continuously without knot
Point；The prestressing force applied to prestressing force dowel is transmitted on supporting body, by the anchoring body that wraps up outside supporting body to external stratum
Dispersion.
Beneficial effect：Since the pulling force of its unlock is much smaller than the pull-off force of every steel strand wires, safety mechanical easy to accomplish
Unlock.The length that recycling pulls out anchor cable is equal to the length of anchoring, and the resistance of recycling is not superimposed.So that the time of recycling contracts significantly
Short, the rate of recovery reaches 99% or more.
Detailed description of the invention
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments；
Fig. 1 is the stress dispersing type stiffening pile structural schematic diagram of recyclable dowel of the present invention.
Fig. 2 is the internal structure section of the supporting body of the stress dispersing type stiffening pile of recyclable dowel of the present invention
Figure.
Fig. 3 is the internal structure plane of the supporting body of the stress dispersing type stiffening pile of recyclable dowel of the present invention
Figure.
Fig. 4 is that the supporting body of the stress dispersing type stiffening pile of recyclable dowel of the present invention and dispersion compositions are illustrated
Figure
Fig. 5 is that the series connection supporting body push of the stress dispersing type stiffening pile of recyclable dowel of the present invention enters anchoring
Body process schematic
Fig. 6 unlocks schematic diagram when being the dowel recycling of the stress dispersing type stiffening pile of recyclable dowel of the present invention.
Fig. 7 is that the prestressing force locking anchorage plane of the stress dispersing type stiffening pile of recyclable dowel of the present invention is shown
It is intended to.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Pilework of putting more energy into the present embodiment is as shown in Figure 1, be that substep applies completion.Both can in harder soil layer shape
At can provide the anchor force of 500KN or more, can also be formed in weak soil layer such as muck soil, provide the anchor of 300KN or more
Gu power can recycle completely dowel after completing support action.
(1) jet mixing drilling machine or roof-bolter are used, formation one is slanting, major diameter in the stratum 16 for needing to anchor
Soil cement or cement mortar stiffening pile anchoring body 1；
(2) prestressing force dowel 2 and traction dowel 9 are installed in supporting body 3, is used between locking fixture block 61 and bearing seat 62
Locking plate 4 locks prestressing force dowel 2；Dowel 9 is drawn with the locking of locking plate 4 among fixture block 6 holding out against, as shown in Figures 2 and 3；Locking
Fixture block 61 and the inverted wedge shape each other of fixture block 6 is held out against, is assembled by muti-piece.It need to carry out between prestressing force dowel 2 and traction dowel 9
Distinguishing mark.
(3) for soft soil layer be dispersion by supporting body transmitting come active force, behind supporting body 3 installation one point
Granular media 17, such as Fig. 4.
(4) U-shaped spray head 14 is connected with drilling rod 13, two whitewashing mouths 15 of U-shaped spray head is made to penetrate supporting body 3
In two 10 garden holes of earrings, as shown in Figure 5；
(4) thrust for utilizing drilling rod 13, supporting body 3 is pushed in the anchoring body 1 by formation, and the whitewashing of push process subtracts
Resistance extracts drilling rod process and reinforcing of whitewashing out, to improve the intensity and compactness of anchoring body；Supporting body 3 is a hermetically sealed knot
Plectane 5 and subsequent cavity 7 lid of structure, front realize sealing by sealing element 8, while being arranged when the disengaging supporting body of dowel
Round table-like sealing device 11, as shown in Fig. 2, ensuring that the slurries in work progress cannot penetrate into the inside of supporting body 3 in this way.
(5) when the maintenance of the soil cement anchoring body 1 of major diameter reaches the intensity of design requirement, not using combination jack pair
Dowel with length applies prestressing force, is locked in the crown beam or waist rail of supporting construction with anchorage 12, as shown in Figure 1；In order to allow
It draws dowel to draw, sets a hole at anchorage center, as shown in Figure 7.
(6) after the completion of supporting construction mission, dowel 9 first is drawn with punching jack tension, makes to hold out against fixture block 6 and locking
Fixture block 61 is detached from, and is held out against fixture block 6 and is connected in the cavity 7 for being pulled into supporting body with traction dowel 9, the locking plate 4 of prestressing force dowel 2
It is disengaged naturally with locking fixture block 61, is disconnected prestressing force dowel 2 with supporting body 3, as shown in Figure 6；
(7) unlock the anchorage 12 in crown beam or waist rail, by prestressing force dowel 2 and draws dowel 9 using dragger
It recycles and comes out from the stratum of anchoring 16 together.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent defines.
Claims (1)
1. the construction method of the stress dispersing type stiffening pile of recyclable dowel, which is characterized in that steps are as follows：
(1) jet mixing drilling machine or roof-bolter are used, forms slanting, major diameter a soil cement or water in the stratum of anchoring
Cement mortar stiffening pile anchoring body；
(2) prestressing force dowel and traction dowel are installed in supporting body, and carries out distinguishing mark；
Prestressing force dowel and traction dowel are installed in supporting body, locks prestressing force with locking plate between locking fixture block and bearing seat
Dowel；Traction dowel is locked with locking plate among fixture block holding out against；It locks fixture block and holds out against fixture block inverted wedge shape each other, assembled by muti-piece
It forms；It carries out prestressing force dowel and draws the distinguishing mark between dowel；Install a dispersion behind supporting body additional；
(3) U-shaped spray head is connected with drilling rod, two mouths of whitewashing of U-shaped spray head is made to penetrate two earrings gardens of supporting body
Kong Zhong；
(4) thrust for utilizing drilling rod, supporting body is pushed in the anchoring body by formation, and push process whitewashing drag reduction, extraction is bored
Bar process and reinforcing of whitewashing, to improve the intensity and compactness of anchoring body；
(5) long using combination jack pair difference when the maintenance of the soil cement anchoring body of major diameter reaches the intensity of design requirement
The dowel of degree applies prestressing force, is locked in the crown beam or waist rail of supporting construction with anchorage；
By (1)-(5) step, anchoring body is formed, prestressing force dowel, traction dowel and supporting body, carrying are equipped in anchoring body
Body is cylinder, the symmetrical a pair earrings outstanding of outer rim；Supporting body upper cover is the plectane for holding out against prestressing force dowel and locking plate,
Locking fixture block is symmetrically anchored on bearing seat and locking fixture block by locking plate, is led with the mutual wedgewise of fixture block, prestressing force dowel is held out against
Draw dowel by locking plate be anchored at it is intermediate hold out against in fixture block, lower part is that a cavity body holds out against fixture block when dowel is drawn in tensioning
It drops in the cavity body；Supporting body is made of high strength plastics or steel, and a traction anchor is used between multiple supporting bodies
Muscle is connected on one, and the prestressing force dowel in previous supporting body is passed through from the earrings hole outside the latter supporting body；Carrying
It is that the cavity sealed by sealing element, prestressing force dowel and traction dowel are prominent equipped with one from supporting body disengaging position in vivo
Rotary table sealing device out；A dispersion is connected after supporting body, and the active force that supporting body transmitting comes is passed through into longer dispersion
Body, which is given, to be distributed in anchoring body；
(6) after the completion of supporting construction mission, dowel first is drawn with punching jack tension, fixture block will be held out against and pull in supporting body
Cavity in, the locking plate of prestressing force dowel and locking fixture block disengage, and are disconnected prestressing force dowel with supporting body；
(7) anchorage to unlock in crown beam or waist rail, using dragger by prestressing force dowel and traction dowel together from anchor
Solid stratum in recycle and come out.
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Families Citing this family (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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| JPH10176328A (en) * | 1996-12-18 | 1998-06-30 | V S L Japan Kk | Removal anchor |
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| 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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- 2016-08-08 CN CN201610642167.7A patent/CN106088088B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202347500U (en) * | 2011-11-30 | 2012-07-25 | 中国水利水电第八工程局有限公司 | Integrated cable-penetrating guiding device for U-shaped anchor cable |
| 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 |
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| CN106088088A (en) | 2016-11-09 |
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