CN103758125B - Extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable - Google Patents
Extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable Download PDFInfo
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- CN103758125B CN103758125B CN201410026431.5A CN201410026431A CN103758125B CN 103758125 B CN103758125 B CN 103758125B CN 201410026431 A CN201410026431 A CN 201410026431A CN 103758125 B CN103758125 B CN 103758125B
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Abstract
The invention discloses a kind of extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable, it comprises steel strand, locked instrument, Compress Spring, pressure-bearing steel plate back-up ring, fairlead, slip casting Seed harvest, steel strand support, anchor plate and work anchor.The anchor cable skeleton integral diameter that this product steel strand are formed is less, when putting into anchor hole, avoid to produce with hole wall and hinder and interference, conical guiding sleeve is installed in steel strand front end can carry out exclusion separation, squeezed hole wall by the drift sand mud in anchor hole, ensure that anchor cable is well on propelling, after injection forming, the dispersed structure be jointly made up of locked instrument, pressure-bearing steel plate back-up ring and compressible spring and steel strand combines co-operation with cement Seed harvest, larger prestressing force can be born, avoid steel strand and slip casting Seed harvest generation break-off.
Description
Technical field
The present invention relates to civil construction project field, be specifically related to a kind of anchoring limitation locking device, particularly relate to one
Plant extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable.
Background technology
Up to now, the dangerous sidewall horizontal movement of super-sized foundation pit supporting and protection structure span centre and non-span centre sidewall horizontal position
Move, all adopt and the way of group's anchor Shi Hanzhang is controlled; Or adopt inner support to carry out deep foundation ditch control of horizontal displacement.In rock mass, the dam foundation, side slope, underground chamber reinforcing technique, prestress anchorage cable is that a kind of construction method is easy, consolidation effect obvious, the construction technology of remarkable in economical benefits.This technology has been widely used in the fields such as water power, railway, mine, building, tunnel.China's rock mass prestressed anchorage technology is started to walk by the sixties, and because facility do not match, construction technology falls behind, and can not meet requirement of engineering.Enter the eighties mid-term, the prestressed anchor pole technology of China has had larger development, prestress anchorage cable is commonly applied to dam body, stabilization of dam foundation process, underground chamber high side wall consolidation process, deep foundation pit of construction supporting, unstable Reinforcing High Slope process, gate pier, lock chamber reinforcing etc.
Since 20th century, just work out enlarged footing anchor pole " high-pressure injection enlarged footing mooring rod technique code JGJ/T282-2012 ", prior art enlarged footing anchor pole is also known as JL anchor pole, or claim hard iron connection enlarged footing anchor pole, adopt high-pressure injection principle to carry out cutting reaming to the hole wall soil body within the scope of a segment length bottom anchor hole, and replace backfilling cement slurry and form a columniform enlarged footing, namely form high-pressure injection enlarged footing anchor cable.Its advantage is a lot: the advantage such as uplift resistance is high, work shift is little, reliability is high, discreteness is little, short, the free segment length of steady quality, anchoring section, the autologous intensity of the body of rod are large.The patent of invention ZL20101007233.4 that State Patent Office was authorized on August 10th, 2011, a kind of for the hinge type large-tonnage anchor device in enlarged footing, and as according to Ju, write " high-pressure injection enlarged footing mooring rod technique code " JGJ/T282-2012, and, from 1 day November in 2012, promulgated implement in China by The Ministry of Construction of the People's Republic of China, MOC, these steel strand enlarged footing anchor poles are the anchor pole of prestress anchorage cable type.Adopt hinge type large-tonnage anchor device, namely hinge clamp bearing plate is not flicking state at lock-out state, be provided with the semi-circular arc section of 180 degree foremost, steel strand are looped around hinge clamp bearing plate and are provided with in the semi-circular arc section of 180 degree foremost, the diameter of its semi-circular arc section is very close compared with the anchor hole aperture of enlarged footing anchoring free segment, be slightly less than 10-30mm, in anchor cable pore forming process, with hinge clamp bearing plate steel wire bundle front end wider, the resistance run into when advancing in hole is larger, very hard, even steel wire bundle pushes away less than just pushing away at the bottom of hole motionless stuck, occur the reason of this problem be form the diameter of semi-circular arc with the steel strand of hinge clamp bearing plate in hinge clamp front end and anchor hole diameter very close, gap is very little, when advancing anchor cable bundle in hole loose-leaf binder front end by hole quicksand or mud all concentrate propelling collect in a pile, hinder the propelling of steel wire bundle, if run into layer of sand founding drum water easy collapse hole region anchor cable hole local collapse hole or meet anchor hole undergauge, steel wire bundle advances difficult especially in hole, often steel wire bundle is had just to push away motionless being seized in the common anchor hole of anchorage cable stretching free segment, generation anchor cable skeleton does not enter the fault in the region of enlarged footing at all.Cause this anchor cable to perform practically no function, construction enterprises fear that owner and management are known or in order to reduce loss, withholding the truth, privately the steel strand not advancing the anchor cable skeleton at the bottom of anchor hole hole to expose being sliced off, just can get by under false pretences.For anchor cable skeleton with originally not entering the anchor cable performed practically no function in enlarged footing region, anchor cable after injection forming applies larger stretching force, steel strand are very easily separated with slip casting Seed harvest, bring out the cave-in accidents such as rock mass, the dam foundation, building foundation pit, especially, in the metropolis of housing-group building very dense, the dangerous sidewall control of horizontal displacement of super-sized foundation pit supporting and protection structure span centre and non-span centre sidewall horizontal Bit andits control are more seemed particularly important.
[the content of invention
[the object of the invention is the deficiency in order to solve above-mentioned technology, providing a kind of extruding tapered end spring bearing plate stress
Decentralized large-tonnage enlarged footing anchor cable, it comprises steel strand, locked instrument, Compress Spring, pressure-bearing steel plate back-up ring, fairlead, slip casting Seed harvest, steel strand support, anchor plate and work anchor, described steel strand device is on steel strand support, described locked instrument, pressure-bearing steel plate back-up ring and Compress Spring are all installed on every bar single steel strand of anchorage cable anchoring section, described locked instrument and steel strand extrude and are integrated, described pressure-bearing steel plate back-up ring is arranged on the rear end of locked instrument, described Compress Spring outer wrap has film, Compress Spring two ends are connected with locked instrument and pressure-bearing steel plate back-up ring respectively, described fairlead is sleeved on the steel wire bundle of many steel strand formation foremost, the steel strand exposed outside apron piece arrive design load through Shi Hanzhang, then carry out locking installation by anchor plate and work anchor, and common formation anchor cable skeleton, described anchorage cable anchoring section is arranged in slip casting Seed harvest.
Further, described locked instrument comprises sleeve and is installed on the spring in sleeve; Described locked instrument and steel strand extruded after, spring is extruded to sleeve lining and steel strand outer ring, is deformed into a tooth shape, make sleeve and steel strand be bited into one.
Further, locked instrument is close in one end of described Compress Spring, and the other end is close to pressure-bearing steel plate back-up ring, and Compress Spring compresses between pressure-bearing steel plate back-up ring front end and locked instrument end; The external surface film wrapped of the outside diameter hoop of Compress Spring, for Compress Spring pre-sets out removable space, can protect reserved mobile space not enter or cement mortar of intaking less herein.The spring of the compression herein arranged makes to be reserved with mobile space between pressure-bearing steel plate back-up ring and locked instrument, stretching force passes to spring by locked instrument, pass to pressure-bearing steel plate back-up ring lentamente by spring again, finally passed to partial pressing's contact surface (contact surface of cement calculus and pressure-bearing steel plate back-up ring) of cement calculus again by pressure-bearing steel plate back-up ring.Compress Spring herein serves the effect of stress buffer, stress peak clipping, anti-stress mutation and damping etc.
With the object of the Compress Spring of film wrapped be for during tension steel strand to locked instrument preset mobile space, in advance
If the effect of mobile space be: serve slow releasing stress, cut down peak stress, prevent from stress from concentrating undergoing mutation, cause pressure-bearing steel plate back-up ring partial pressing excessive, make local cement Seed harvest suffer to crush and destroy.We are once in the anchoring section extruding the common anchor cable in tapered end stress dispersion type height tonnage anchor cable, only locked instrument is set, the anchor cable club shaft of the cement calculus of pressure-bearing steel plate back-up ring is not established to make pullout tests, it found that: the body of rod does not rupture or unyielding, just the cement Seed harvest of locked instrument local crushes, there is not the situation of this anchoring body bearing capacity damage, but have certain horizontal displacement in the cement Seed harvest of steel strand drive locked instrument in anchorage cable anchoring section.' exactly because steel strand drive in the cement Seed harvest of locked instrument in anchorage cable anchoring section certain horizontal displacement ' this great discovery, so, just set up the mobile space preset of Compress Spring.
Further, described pressure-bearing steel plate back-up ring, Compress Spring and locked instrument are all equidistantly installed on anchorage cable anchoring section
In every root steel strand on, the often place pressure-bearing steel plate back-up ring on the every root steel strand in anchorage cable anchoring section, compressible spring with
And locked instrument forms a servo-actuated extruded sleeve, the every root steel strand in anchorage cable anchoring section are equidistantly arranged and install multiple with
Dynamic extruded sleeve, the every root steel strand in anchorage cable anchoring section is installed the Structure composing stress distribution device of multiple servo-actuated extruded sleeve,
The multiple servo-actuated extruded sleeve of uniform installation on every root steel strand in described anchorage cable anchoring section, and on adjacent steel twisted wire servo-actuated squeeze
Gland is all staggeredly arranged.Every root steel strand are installed multiple servo-actuated extruded sleeve, have defined a monomer stress dispersion structure,
Every root anchor cable is made up of many steel strand, the stress dispersion structure that the many bodies be namely made up of multiple monomer stress dispersion structure are integrated
(same under being called for short ' stress dispersion structure ').
The diameter of pressure-bearing steel plate back-up ring is all less than 80mm.Minimum design dimension according to pressure-bearing steel plate back-up ring is determined and adjusts
The size and dimension of enlarged footing.Pressure-bearing steel plate back-up ring size design is excessive, in non-enlarged footing anchor hole hand-hole section, anchor cable skeleton entirety by free segment anchor hole be limited in non-enlarged footing anchor hole hand-hole section block push away less than design hole at the bottom of the degree of depth; Pressure-bearing steel plate back-up ring design size is too small, and enlarged footing anchor cable can not play one's part to the full.The minimum design dimension of pressure-bearing steel plate back-up ring is determined as calculated, namely under inscribing before the less pressure-bearing steel plate back-up ring size that guarantee design is selected can provide cement Seed harvest partial pressing not occur crushing destruction, carry out improving to the size of enlarged footing and adjust, the length of enlarged footing is diminished, diameter becomes large, reduces cost.The diameter of enlarged footing increases, anchored force also increases, the lever strength of enlarged footing anchoring section is no longer weak link, therefore Compress Spring and pressure-bearing steel plate back-up ring to be set up at the extruding tapered end place of enlarged footing anchoring section, when applying design prestress value, the anchor cable club shaft of the cement calculus of enlarged footing anchoring section, the minimum dimension and cutting off not because arranging the pressure-bearing steel plate back-up ring determined through designing and calculating is advisable.
Further, the cross section of described steel strand support is polygonal, and its central authorities are provided with through hole, and described steel strand are evenly arranged on the interior recess of steel strand support.
Further, described fairlead is conical, and its central authorities are provided with through-hole.
Further, described extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable is applicable to anchor cable
Gu section has the anchor cable of bonding or non-bending steel cable type.
Further, described slip casting Seed harvest is the cylinder with one or more taper table top.
Slip casting Seed harvest and enlarged footing anchorage cable anchoring section, comprise common anchoring section and enlarged footing section and enlarged footing front end face
Composition.Under anchorage cable anchoring section anchorage length and parameters the same terms, the developed area of the anchoring section of enlarged footing anchor cable,
Equal the circumference developed area of the common anchoring section in enlarged footing anchorage cable anchoring section, add the circumference developed area of enlarged footing section,
Add the developed area of enlarged footing front end face, deduct the circular bottom surface area sum in the anchor cable cross section of common anchoring section; Compared with the developed area several times greatly of the anchoring section of the common anchor cable of equal length, the anti-pulling capacity limiting value of the more common anchor cable of anti-pulling capacity limiting value of enlarged footing anchor cable is made to exceed several times.
Because the diameter of enlarged footing is large compared with the diameter of common anchoring section, the stress that enlarged footing changes anchoring body makes anchor
Gu power increases, the lever strength of common anchoring section is weak link, general in extruding tapered end stress dispersion type height tonnage anchor cable
After being provided with locked instrument in the anchoring section of logical anchor cable, pressure-bearing steel plate back-up ring just should not be set, otherwise easily cut off common anchoring section
The anchor cable club shaft of cement calculus.We are to the anchoring section of the common anchor cable in extruding tapered end stress dispersion type height tonnage anchor cable
In, be provided with locked instrument, the anchor cable club shaft being provided with again the cement calculus of pressure-bearing steel plate back-up ring has made pullout tests, and it found that: " be all generally body of rod fracture or surrender, the situation that this anchoring body bearing capacity damage occurs is little ".
Further, the steel strand of described anchorage cable stretching free segment are set with steel strand gum cover.
Further, the multiple servo-actuated extruded sleeve of uniform installation on the every root steel strand in described anchorage cable anchoring section.By bullet
When gonosome steel strand act as anchor cable use, if apply stretching force to anchor cable, then extend equably.Utilize this character, install multiple servo-actuated extruded sleeve, the size of root Ju stretching force in anchorage cable anchoring section, anchor cable produces corresponding elongation.Originally be lean on the servo-actuated extruded sleeve of least significant end that stretching force is passed to first pressure-bearing steel plate back-up ring by Compress Spring transition buffer, then when reaching the stretching force of defined, stretching force just starts to be delivered to apart from least significant end second servo-actuated extruded sleeve, and stretching force is passed to second pressure-bearing steel plate back-up ring by Compress Spring transition buffer.When stretching force reaches more than 2 times of stretching force of regulation stretching force divided by the number gained of servo-actuated extruded sleeve, stretching force is passed to the 3rd pressure-bearing steel plate back-up ring by compressible spring transition buffer by least significant end the 3rd servo-actuated extruded sleeve, the rest may be inferred, stretching force sequentially passes to N number of pressure-bearing steel plate back-up ring, and such stretching force is just evenly dispersed.Between one end and locked instrument of pressure-bearing steel plate back-up ring, reserving removable space by arranging Compress Spring outsourcing film, passing to pressure-bearing steel plate back-up ring corresponding to prestressed size.
To this kind of enlarged footing anchor cable, from jack load ~ dynamometer line of load, stretching force substantially equably
Disperseed and transmitted.In addition from jack load ~ anchor cable strain capacity curve, act on stretching force on anchor cable at each
Between seat, also approximate equality is transmitted in proportion.
To this kind of enlarged footing anchor cable, enlarged footing anchor cable is installed several bearing plate Compress Spring locked instrument is integrated
The test of linkage, and the removable space that Compress Spring is set between each locked instrument and pressure-bearing steel plate back-up ring, test
Result can confirm, stretching force can impartial act on pedestal, and this result of the test has been dissolved into enlarged footing anchor cable
In, enlarged footing anchor cable be used for ground anchorage, anchoring body end can not produce stress and concentrate, corresponding to series winding interlock locked instrument number and by even wait dispersion.The stretching force acted on this kind of equal diameter enlarged footing anchoring section is disperseed to transmit, thus the full section of anchoring body obtains impartial periphery frictional resistance, can be applicable to reducing enlarged footing and equal diameter enlarged footing and the general anchor cable of equal diameter, become the earth anchor that safety is higher, it will by all trades and professions extensive use.
Adopt technique scheme, the technique effect that the present invention produces has: this product improves existing enlarged footing anchor cable structure, the anchor cable skeleton of this product is when putting into anchor hole, little 30-70mm compared with entering bore dia with loose-leaf binder bearing plate steel strand front end, to avoid when this product steel strand steel wire bundle is foremost pushed ahead in radom insertion anchor hole hole wall, the conical guiding sleeve that steel wire bundle is installed foremost the drift sand mud in anchor hole can be carried out exclusion be separated and to the squeezed reaming of anchor hole hole wall surrounding, conical guiding sleeve guides steel wire bundle foremost in anchor hole pushed, ensure that anchor cable skeleton is well on propelling in hole, even if run into the layer of sand founding drum easy collapse hole region of water, when anchor hole local collapse hole or undergauge, steel wire bundle still can penetrate among anchor hole smoothly, after injection forming, cement paste Seed harvest and locked instrument and compressible spring bearing plate and each steel strand all generate as a whole, namely be equivalent to anchor cable skeleton entirety be embedded in advance in the cement Seed harvest of anchor hole grouting behind shaft or drift lining formation.Further, steel strand are subject to the effect of stretching force, start stressed apart from steel strand end first locked instrument, when reaching capacity bearing capacity apart from steel strand end first locked instrument, are compressed by compressible spring by mobile space reserved herein.
Tension stress is passed to first bearing plate apart from steel strand end lentamente; In like manner, the rest may be inferred, in anchor hole anchoring section tension stress pass to respectively lentamente apart from steel strand ends second, third, the 4th ... bearing plate.Each pressure-bearing steel plate back-up ring and each locked instrument dispersed stressed, make the overall anchor cable of enlarged footing can bear the very large prestressing force of jack applying, avoid when steel strand, locked instrument, bearing plate and slip casting Seed harvest bear tensile stress jointly and break-off occurs.In the metropolis of housing-group building very dense, effective control is provided, for the safety of building operations provides guarantee for the sidewall horizontal displacement of super-sized foundation pit supporting and protection structure span centre and the displacement of non-span centre sidewall horizontal.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
[Fig. 2 is that A-A is to sectional view;
[Fig. 3 is the structural representation of locked instrument;
[Fig. 4 is the partial enlarged drawing of servo-actuated extruded sleeve;
[wherein: 1, steel strand; 2, locked instrument; 3, Compress Spring; 4, pressure-bearing steel plate back-up ring; 5, fairlead; 6, slip casting Seed harvest; 7, steel strand support; 8, anchor plate; 9, work anchor; 10, apron piece; 11, anchorage cable stretching free segment; 12, steel strand gum cover; 13, anchorage cable anchoring section; 21, sleeve; 22, spring; 31, film; 71, through hole.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
As Figure 1-Figure 4, structural representation of the present invention, a kind of extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable, it comprises steel strand 1, locked instrument 2, Compress Spring 3, pressure-bearing steel plate back-up ring 4, fairlead 5, slip casting Seed harvest 6, steel strand support 7, anchor plate 8, work anchor 9, steel strand gum cover 12, anchorage cable anchoring section 13 in apron piece 10, anchorage cable stretching free segment 11, protection anchorage cable stretching free segment; The cross section of steel strand support 7 is that its central authorities of polygonal have through hole 71, and the dispersed interior recess being arranged on steel strand support 7 of steel strand 1, steel strand 1 device is on steel strand support 7.Locked instrument 2, pressure-bearing steel plate back-up ring 4 and Compress Spring 3 are all equidistantly installed on every bar single steel strand 1 of anchorage cable anchoring section 13, constitute single servo-actuated extruded sleeve, on every bar single steel strand 1 of anchorage cable anchoring section 13, the multiple servo-actuated extruded sleeve of equidistant installation, is just assembled in order to stress distribution device.Locked instrument 2 comprises sleeve 21 and is installed on the stone dead wire spring 22 in sleeve 21, stone dead wire spring 22 is installed on the steel strand 1 of anchorage cable anchoring section 13, application hydraulic tongs is pressurized to 30-45MPa, by sleeve 21, spring 22 and steel strand 1 extrusion molding are integrated, in extrusion process, sleeve 21 attenuates elongated by External Force Acting, stone dead wire spring 22 is extruded, internal thread and outer Si Siya is squeezed out respectively outside sleeve 21 inwall and steel strand 1, sleeve 21 and steel strand 1 are made to be bited into one, enhance the tightness be connected between sleeve 21 with steel strand 1, not easily depart from the sleeve 21 of steel strand 1 after extruded, be not drawn out easily.Compressible spring 3 is installed on the steel strand 1 of anchorage cable anchoring section, Compress Spring 3 two ends are connected with locked instrument 2 and pressure-bearing steel plate back-up ring 4 respectively, the very thin plastic sheeting of one deck 31 is wrapped up at the circumferential outer surface of Compress Spring 3, moveable slight compression space is reserved to compressible spring 3, through hole is provided with in the middle part of pressure-bearing steel plate back-up ring 4, pressure-bearing steel plate back-up ring 4 is arranged on the rear end of locked instrument 2, and namely the end of locked instrument 2 is close in one end of Compress Spring 3, and the other end is close to pressure-bearing steel plate back-up ring 4.Fairlead 5 is conical, and its central authorities are provided with through-hole 51, and fairlead 5 is sleeved on the steel wire bundle of the foremost that many steel strand 1 are formed foremost, guides steel wire bundle in anchor hole pushed, until to push at the bottom of anchor cable hole hole foremost.By hydraulic jack, stretch-draw is carried out to steel strand 1 Shi Hanzhang exposed outside apron piece 10, stretch-draw is installed to carrying out locking with anchor plate 8 and work anchor 9 during design load, form anchor cable skeleton, anchor cable skeleton is arranged in anchor hole, forms Seed harvest 6 to anchorage cable anchoring section 13 slip casting.The slip casting Seed harvest 6 of this product is for having one or more taper table top reducing variable cross-section cylinder.In addition, on the steel strand 1 of anchorage cable stretching free segment 11, also be set with steel strand gum cover 12, when to 13 slip casting of anchorage cable anchoring section, steel strand gum cover 12 is located in anchoring free end 11 and can effectively prevents the steel strand 1 in anchorage cable stretching free segment 11 from producing adhesion with the cement grout injected in anchor hole.
The pressure-bearing steel plate back-up ring 4 of this product and the every root steel strand 1 in anchorage cable anchoring section 13 and compressible spring 3 and locked instrument 2 are set with to be integrated and constitute single mobile extruded sleeve, on single steel strand, multiple mobile extruded sleeve is installed, form monomer stress dispersion structure, every root anchor cable is made up of many steel strand, i.e. the integrated stress dispersed structure that is made up of multiple monomer stress dispersion structure of every root anchor cable.Single mobile extruded sleeves numerous on many steel strand staggers setting.Regenerate a stress dispersion structure.The anchor cable skeleton of assembled formation, all little than the anchor hole diameter of the anchorage cable stretching free segment 30-50mm of its external diameter; All little than the diameter foremost under loose-leaf binder bearing plate locked instrument (patent of invention ZL20101007233.4) lock-out state 40-80mm, is convenient to enlarged footing anchor cable skeleton and is well in anchor hole at the bottom of propelling through design hole.In addition, extruding tapered end spring bearing plate stress dispersion type tonnage anchor cable of the present invention is applicable to the anchor cable of bonding or non-bending steel cable type.
When applying, due to the anchor cable skeleton steel wire bundle foremost of this product, its diameter is all than loose-leaf binder pressure-bearing
Anchor cable skeleton in plate enlarged footing anchor cable loose-leaf binder bearing plate foremost semicircle diameter width is in the locked state little
20-40mm, in anchor cable skeleton perforation procedure, due to the setting of fairlead, steel wire bundle can not produce with hole wall foremost and dryly scratches and hinder.Simultaneously, in steel wire bundle perforation procedure, drift sand mud can be shunted and enclose extruding reaming to anchor hole periphery one by conical guiding sleeve, like this, steel wire bundle can push to the bottom of anchor hole projected depth smoothly under the effect of fairlead, makes anchor cable skeleton reach projected depth.Grouting Pipe is put into anchor cable skeleton simultaneously, and carries out slip casting to anchoring section, and after slip casting, steel strand, locked instrument, compressible spring, pressure-bearing steel plate back-up ring and slip casting Seed harvest regenerate an overall structure; During steel strand Shi Hanzhang in the external application jack pair enlarged footing anchor cable of work anchor, first the pulling force that steel strand bear passes to the locked instrument apart from steel strand end, pass to compressible spring by locked instrument again, then pass to pressure-bearing steel plate back-up ring by Compress Spring.In like manner pass to last pressure-bearing steel plate back-up ring of anchorage cable anchoring section successively.The setting of Compress Spring, peak stress is cut down in its effect, the effect that buffering stress cuts down peak stress can be played, directly the local of slip casting Seed harvest is squeezed broken when preventing locked instrument stressed, even if apply larger pulling force to the anchor cable after injection forming, can not there is break-off in steel strand in slip casting Seed harvest.
When elastic body steel strand are used as anchor cable, if apply stretching force to anchor cable, then extend equably.Utilize this character, install multiple servo-actuated extruded sleeve, the size of root Ju stretching force in anchorage cable anchoring section, anchor cable produces corresponding elongation.Originally be lean on the servo-actuated extruded sleeve of least significant end that stretching force is passed to first pressure-bearing steel plate back-up ring by compressible spring transition buffer, then when reaching the stretching force of defined, stretching force just starts to be delivered to apart from least significant end second servo-actuated extruded sleeve, and stretching force is passed to second pressure-bearing steel plate back-up ring by compressible spring transition buffer.When stretching force reaches more than 2 times of stretching force of regulation stretching force divided by the number gained of servo-actuated extruded sleeve, stretching force is passed to the 3rd loaded plate by Compress Spring transition buffer by least significant end the 3rd servo-actuated extruded sleeve, the rest may be inferred, stretching force sequentially passes to N number of pressure-bearing steel plate back-up ring, and such stretching force is just evenly dispersed.Between one end and locked instrument of pressure-bearing steel plate back-up ring, reserving removable space by arranging spring outsourcing film, passing to pressure-bearing steel plate back-up ring corresponding to prestressed size.
Like this, extrude tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable and just can bear larger in advance should
Power, and steel strand and break-off can not be produced with slip casting Seed harvest with the locked instrument that steel strand are combined into one.The stretching force that the anchor cable of this product bears is compared with common anchor cable, the tensile load born is multiplied, and loss of prestress at double
Reduce.The stretching force that the anchor cable of this product bears, compared with common anchor cable, can improve about 50-70%; The stretching force that the anchor cable of this product bears, compared with the common anchor cable of extruding tapered end stress dispersion type height tonnage, can improve about 20-40%; The common anchor cable of extruding tapered end stress dispersion type height tonnage, compared with common anchor cable, can improve about 25-40%; Common anchor cable when its Shi Hanzhang of jack pair its loss of prestress up to 30-50%; Its loss of prestress is up to 15-25% when its Shi Hanzhang of jack pair for the common anchor cable of extruding tapered end stress dispersion type height tonnage, and little 15-25% is wanted in its loss of prestress compared with common anchor cable; Its loss of prestress is up to 5-15% when its Shi Hanzhang of jack pair for the anchor cable of this product, and little 25-35% is wanted in its loss of prestress compared with common anchor cable; Its loss of prestress wants little by about 10% compared with the common anchor cable of extruding tapered end stress dispersion type height tonnage.Greatly improve the utilization rate of anchor cable resource, and this anchor cable structure can bear larger pretightning force, and anchoring section is more stable, has ensured the safety of building operations.
Finally it should be noted that above embodiment only in order to technical scheme of the present invention to be described and unrestricted, although reference
Preferred embodiment is to invention has been detailed description, and those of ordinary skill in the art should be appreciated that can to of the present invention
Technical scheme is modified or equivalent replacement, and does not depart from the spirit and scope of technical solution of the present invention, and it all should be encompassed in
In the middle of right of the present invention.
Claims (7)
1. extrude a tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable, it is characterized in that: it comprises steel strand
Line (1), locked instrument (2), Compress Spring (3), pressure-bearing steel plate back-up ring (4), fairlead (5), slip casting Seed harvest (6), steel strand support (7), anchor plate (8) and work anchor (9), described steel strand (1) device, on steel strand support (7), the steel strand (1) that described locked instrument (2), pressure-bearing steel plate back-up ring (4) and Compress Spring (3) are all installed on anchorage cable anchoring section (13) constitutes servo-actuated extruded sleeve, described locked instrument (2) and steel strand (1) extrude and are integrated, described pressure-bearing steel plate back-up ring (4) is arranged on the rear end of locked instrument (2), described Compress Spring (3) outer wrap has film (31), Compress Spring (3) two ends are connected with locked instrument (2) and pressure-bearing steel plate back-up ring (4) respectively, and described fairlead (5) is sleeved on steel wire bundle that many steel strand (1) are formed foremost, the steel strand (1) that apron piece (10) outside is exposed arrive design load through Shi Hanzhang, carry out locking by anchor plate (8) and work anchor (9) again to install, common formation anchor cable skeleton, described anchorage cable anchoring section (13) is arranged in slip casting Seed harvest (6), described locked instrument (2), Compress Spring (3) and pressure-bearing steel plate back-up ring (4) are all equidistantly installed on the every root steel strand (1) in anchorage cable anchoring section (13), often place pressure-bearing steel plate back-up ring (4) on every root steel strand (1) in anchorage cable anchoring section (13), compressible spring (3) and locked instrument (2) form a servo-actuated extruded sleeve, every root steel strand (1) in anchorage cable anchoring section (13) are upper equidistantly to be arranged and installs multiple servo-actuated extruded sleeve formation stress distribution device, and the multiple servo-actuated extruded sleeve on adjacent steel twisted wire (1) is all staggeredly arranged.
2. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, its feature
Be: described locked instrument (2) comprises sleeve (21) and is installed on the spring (22) in sleeve (21); After described locked instrument (2) is extruded with steel strand (1), spring (22) is extruded to sleeve (21) inwall and steel strand (1) outer ring, be deformed into a tooth shape, make sleeve (21) and steel strand (1) be bited into one.
3. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1; it is characterized in that: locked instrument (2) is close in one end of described Compress Spring (3); the other end is close to pressure-bearing steel plate back-up ring (4); the external surface of the outside diameter hoop of Compress Spring (3) wraps up with film (31); for Compress Spring (3) pre-sets out removable space, can protect
Mobile space reserved does not herein enter or cement mortar of intaking less.
4. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, its feature
Be: the cross section of described steel strand support (7) is polygonal, and its central authorities are provided with through hole (71), and described steel strand (1) are evenly arranged on the interior recess of steel strand support (7).
5. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, its feature
Be: described fairlead (5) is for conical, and its central authorities are provided with through-hole.
6. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, its feature
Be: described extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable is applicable to anchorage cable anchoring section (13) to be had
The anchor cable of bonding or non-bending steel cable type.
7. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, its feature
Be: described slip casting Seed harvest (6) is for having the cylinder of one or more taper table top.
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| CN201410026431.5A CN103758125B (en) | 2014-01-21 | 2014-01-21 | Extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable |
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| CN201410026431.5A CN103758125B (en) | 2014-01-21 | 2014-01-21 | Extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104131561B (en) * | 2014-08-04 | 2016-01-27 | 中冶成都勘察研究总院有限公司 | A kind of tension stent-type anti-floating anchor rod structure |
| CN104480935B (en) * | 2014-11-18 | 2017-01-18 | 中国电建集团成都勘测设计研究院有限公司 | Anchorage pier structure suitable for surrounding rock deformation |
| CN110067247B (en) * | 2019-06-03 | 2024-01-30 | 河南省交通规划设计研究院股份有限公司 | Large-deformation anchor cable for understable slope and manufacturing method thereof |
| CN112282409B (en) * | 2020-09-07 | 2022-07-12 | 中国建筑第八工程局有限公司 | Top-supporting type carbon fiber prestress tensioning structure and tensioning method |
| CN114382078B (en) * | 2022-01-24 | 2024-01-30 | 福州大学 | Stress and deformation coordination component among anchor cable bundle steel strands and use method |
| CN114808695B (en) * | 2022-04-19 | 2023-06-13 | 国能神东煤炭集团有限责任公司 | Supporting anchor cable and fixing structure |
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| CN103758125A (en) | 2014-04-30 |
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