CN103758125A - Squeezing lock head spring bearing plate stress dispersing type large-tonnage expanding head anchor cable - Google Patents
Squeezing lock head spring bearing plate stress dispersing type large-tonnage expanding head anchor cable Download PDFInfo
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- CN103758125A CN103758125A CN201410026431.5A CN201410026431A CN103758125A CN 103758125 A CN103758125 A CN 103758125A CN 201410026431 A CN201410026431 A CN 201410026431A CN 103758125 A CN103758125 A CN 103758125A
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Abstract
The invention discloses a squeezing lock head spring bearing plate stress dispersing type large-tonnage expanding head anchor cable which comprises a steel strand, a locking device, a compressed spring, a bearing steel plate blocking ring, a guiding sleeve, a grouting concretion body, a steel strand support, an anchor cushion plate and a working anchor. An anchor cable frame formed by the steel strand is small in overall diameter, when the anchor cable frame is placed into an anchor hole, obstruction and interference with the hole wall are avoided, the front end of the steel strand is provided with a cone-shaped guiding sleeve, quicksand and mud in the anchor hole can be squeezed out and separated, the hole wall is squeezed and expanded, smooth pushing forward of the anchor cable is guaranteed, after grouting forming, a dispersed structure formed by the locking device, the bearing plate blocking ring, the compressed spring and the steel strand together and the cement concretion body work together in a united mode, large prestress can be borne, and the phenomenon that the steel strand and the grouting concretion body are separated is avoided.
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 a kind of 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 large deep foundation pit supporting structure span centre and the displacement of non-span centre sidewall horizontal, all adopt group's anchor is applied to prestressed way to control; 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 starts starting 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 applied to dam body, stabilization of dam foundation processing commonly, underground chamber high side wall consolidation process, deep foundation pit of construction supporting, unsettled Reinforcing High Slope processing, gate pier, lock chamber reinforcing etc.
Since 20th century, just worked out enlarged footing anchor pole < < high-pressure injection enlarged footing anchor pole tecnical regulations JGJ/T282-2012 > >, prior art enlarged footing anchor pole claims again JL anchor pole, or claim hard iron to join enlarged footing anchor pole, to adopt high-pressure injection principle, within the scope of one segment length of anchor hole bottom, the hole wall soil body is cut to reaming, and replace backfilling cement and starch and form a columniform enlarged footing, 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, steady quality, short, the free segment length of 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 hinge type large-tonnage anchor device for enlarged footing, and as according to Ju, write < < high-pressure injection enlarged footing anchor pole tecnical regulations > > JGJ/T282-2012, and, from 1 day November in 2012, by The Ministry of Construction of the People's Republic of China, MOC, promulgated in China and implemented, these steel strand enlarged footing anchor poles are the anchor pole of prestress anchorage cable type.Adopt hinge type large-tonnage anchor device, hinge clamp bearing plate is not flicking state at lock-out state, be provided with foremost the semi-circular arc section of 180 degree, steel strand are looped around in the semi-circular arc section that hinge clamp bearing plate is provided with 180 degree foremost, the diameter of its semi-circular arc section is very approaching 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 running 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, the reason that occurs this problem is that the diameter and the anchor hole diameter that with the steel strand of hinge clamp bearing plate, at hinge clamp front end, form semi-circular arc are very approaching, gap is very little, when advancing anchor cable bundle in hole loose-leaf binder front end by hole quicksand or mud all concentrate to advance and collect in a pile, hinder the propelling of steel wire bundle, if run into the local collapse hole of the layer of sand founding drum easy collapse hole of water region anchor cable hole or meet anchor hole undergauge, steel wire bundle is difficult especially to advancing in hole, often there is steel wire bundle just to push away motionless having blocked in the common anchor hole of anchorage cable stretching free segment, anchor cable skeleton occurs to be entered less than 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, withhold the truth, and the steel strand that privately the anchor cable skeleton not advancing at the bottom of anchor hole hole exposed slice off, and just can get by under false pretences.Anchor cable skeleton is followed and originally entered the anchor cable performing practically no function less than in enlarged footing region, anchor cable after injection forming applies larger stretching force, steel strand are very easily separation with slip casting calculus body, 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, for the dangerous sidewall control of horizontal displacement of super large deep foundation pit supporting structure span centre and non-span centre sidewall horizontal displacement control, more seem particularly important.
The content of invention
The object of the invention is the deficiency in order to solve above-mentioned technology, a kind of extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable is provided, it comprises steel strand, locked instrument, Compress Spring, pressure-bearing steel plate back-up ring, fairlead, slip casting calculus body, 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 single steel strand of anchorage cable anchoring section, described locked instrument and steel strand extruding 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 steel wire bundle that many steel strand form foremost, the steel strand that expose in apron piece outside arrive design load through applying prestressing force, then lock installation by anchor plate and work anchor, jointly form anchor cable skeleton, and described anchor cable skeleton is arranged in the slip casting calculus body of anchorage cable anchoring section.
Further, described locked instrument comprises sleeve and is installed on the spring in sleeve; After described locked instrument and steel strand extrusion modling, spring is extruded to sleeve lining and steel strand outer ring, is deformed into a tooth shape, makes 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 external diameter circumference of Compress Spring, for Compress Spring sets in advance out removable space, can protect reserved mobile space not enter herein or the cement mortar of intaking less.The spring of the compression herein arranging 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, by spring, pass to lentamente pressure-bearing steel plate back-up ring again, finally by pressure-bearing steel plate back-up ring, passed to again partial pressing's contact surface (contact surface of cement calculus and pressure-bearing steel plate back-up ring) of cement calculus.Compress Spring has herein played 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 to the default mobile space of locked instrument during for tension steel strand, the effect of default mobile space is: played slow release stress, cut down peak stress, prevent stress concentrate undergo mutation, cause pressure-bearing steel plate back-up ring partial pressing excessive, make local cement calculus body suffer to crush and destroy.We are once in the anchoring section of the common anchor cable in extruding tapered end stress dispersion type high tonnage anchor cable, locked instrument is only set, do not establish the anchor cable club shaft of the cement calculus of pressure-bearing steel plate back-up ring and done resistance to plucking test, it found that: the body of rod does not rupture or be unyielding, just the cement calculus body of locked instrument part crushes, there is not the situation of this anchoring body bearing capacity damage, but have certain horizontal displacement in the cement calculus body of steel strand drive locked instrument in anchorage cable anchoring section.' exactly because steel strand drive in the cement calculus body of locked instrument in anchorage cable anchoring section certain horizontal displacement ' this great discovery, so, just set up the default mobile space of Compress Spring.
Further, described pressure-bearing steel plate back-up ring, Compress Spring and locked instrument are all equidistantly installed on every steel strand in anchorage cable anchoring section, every place pressure-bearing steel plate back-up ring on every steel strand in anchorage cable anchoring section, compressible spring and locked instrument form a servo-actuated extruded sleeve, on every steel strand in anchorage cable anchoring section, equidistantly arrange and install multiple servo-actuated extruded sleeves, the structure that multiple servo-actuated extruded sleeves are installed on every steel strand in anchorage cable anchoring section forms stress distribution device, the multiple servo-actuated extruded sleeves of uniform installation on every steel strand in described anchorage cable anchoring section, and the servo-actuated extruded sleeve on adjacent steel twisted wire is all staggeredly arranged.Multiple servo-actuated extruded sleeves have been installed on every steel strand, formed a monomer stress dispersion structure, every anchor cable is comprised of many steel strand, the stress dispersion structure (being called for short ' stress dispersion structure ' lower same) that the many bodies that are comprised of multiple monomer stress dispersion structures are integrated.
The diameter of pressure-bearing steel plate back-up ring is all less than 80mm.According to the minimum design dimension of pressure-bearing steel plate back-up ring, determine and adjust the size and dimension of enlarged footing.Pressure-bearing steel plate back-up ring size design is excessive, and in non-enlarged footing anchor hole hand-hole section, anchor cable skeleton entirety is subject to block and push away less than the degree of depth at the bottom of the hole of design in the non-enlarged footing anchor hole of being limited in of free segment anchor hole hand-hole section; 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, guaranteeing that the selected less pressure-bearing steel plate back-up ring size of design can provide cement calculus body partial pressing not occur crushing under the front topic of destroying, the size of enlarged footing is improved and adjusted, the length of enlarged footing is diminished, it is large that diameter becomes, and 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 to set up Compress Spring and pressure-bearing steel plate back-up ring 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, does not cut off and is advisable because the minimum dimension of the pressure-bearing steel plate back-up ring definite through designing and calculating is set.
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 penetrating hole.
Further, described extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable is applicable to anchorage cable anchoring section the anchor cable of bonding or non-bending steel cable type.
Further, described slip casting calculus body is the cylinder with one or more taper table tops.
Slip casting calculus body is enlarged footing anchorage cable anchoring section, comprises 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 round base area sum in the anchor cable cross section of common anchoring section; Compared with large several times of the developed area of the anchoring section of the common anchor cable of equal length, make the anti-pulling capacity limiting value of the more common anchor cable of anti-pulling capacity limiting value of enlarged footing anchor cable exceed several times.
Because the diameter of enlarged footing is large compared with the diameter of common anchoring section, the stress that enlarged footing has changed anchoring body increases anchored force, the lever strength of common anchoring section is weak link, after being provided with locked instrument in the anchoring section of the common anchor cable in the high tonnage anchor cable of extruding tapered end stress dispersion type, pressure-bearing steel plate back-up ring just should not be set, otherwise easily cut off the anchor cable club shaft of the cement calculus of common anchoring section.We are in the anchoring section of the common anchor cable in the high tonnage anchor cable of extruding tapered end stress dispersion type, be provided with locked instrument, the anchor cable club shaft that is provided with again the cement calculus of pressure-bearing steel plate back-up ring has been done resistance to plucking test, 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, on the steel strand of described anchorage cable stretching free segment, be set with steel strand gum cover.
Further, the multiple servo-actuated extruded sleeves of uniform installation on every steel strand in described anchorage cable anchoring section.When elastic body steel strand are act as to anchor cable use, if apply stretching force to anchor cable, extend equably.Utilize this character, in anchorage cable anchoring section, multiple servo-actuated extruded sleeves are installed, the size of root Ju stretching force, anchor cable produces corresponding elongation.Originally be, by the servo-actuated extruded sleeve of end, 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 second servo-actuated extruded sleeve of end, and stretching force is passed to second pressure-bearing steel plate back-up ring by Compress Spring transition buffer.When stretching force reach regulation stretching force divided by the stretching force of the number gained of servo-actuated extruded sleeve more than 2 times time, the 3rd servo-actuated extruded sleeve of end passes to the 3rd pressure-bearing steel plate back-up ring by stretching force by compressible spring transition buffer, the rest may be inferred, stretching force is sequentially passed to N pressure-bearing steel plate back-up ring, and stretching force is just evenly dispersed like this.Between one end of pressure-bearing steel plate back-up ring and locked instrument, by the reserved removable space of Compress Spring outsourcing film is set, corresponding to prestressed size, pass to pressure-bearing steel plate back-up ring.
To this kind of enlarged footing anchor cable, from jack load～dynamometer line of load, stretching force is substantially dispersed equably and transmits.In addition from jack load～anchor cable strain capacity curve, act on stretching force on anchor cable between each pedestal also approximate equality transmit in proportion.
To this kind of enlarged footing anchor cable, the test of the linkage that several bearing plate Compress Spring locked instruments are integrated is installed on enlarged footing anchor cable, and the removable space of Compress Spring is set between each locked instrument and pressure-bearing steel plate back-up ring, result of the test can be confirmed, stretching force can impartial act on pedestal, this result of the test has been dissolved in enlarged footing anchor cable, enlarged footing anchor cable is for ground anchorage, anchoring body end can not produce stress concentrate, corresponding to series winding interlock locked instrument number and by even wait dispersion.Act on this kind of stretching force on equal diameter enlarged footing anchoring section and be dispersed transmission, thereby 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 higher earth anchor of safety, it will be 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, while having avoided this product steel strand steel wire bundle foremost to push 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 squeezed separate and to the squeezed reaming of anchor hole hole wall surrounding, conical guiding sleeve guiding steel wire bundle is foremost in anchor hole pushed, ensured that anchor cable skeleton is to the propelling that is well in hole, even if run into the layer of sand founding drum easy collapse hole of water region, when the local collapse hole of anchor hole or undergauge, steel wire bundle still can penetrate among anchor hole smoothly, after injection forming, cement paste calculus body and locked instrument and compressible spring bearing plate and each steel strand all generate as a whole, be equivalent to anchor cable skeleton entirety be embedded in advance anchor hole grouting behind shaft or drift lining form cement calculus body in.And steel strand are subject to the effect of stretching force, apart from first locked instrument of steel strand end, start stressedly, while reaching capacity bearing capacity apart from first locked instrument of steel strand end, by reserved herein mobile space, by compressible spring, compress.
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 end second, third, the 4th ... bearing plate.Each pressure-bearing steel plate back-up ring and each locked instrument are dispersed stressed, make enlarged footing entirety anchor cable can bear the very large prestressing force that jack applies, break-off occurs while having avoided steel strand, locked instrument, bearing plate and slip casting calculus body jointly to bear tensile stress.In the metropolis of housing-group building very dense, for the sidewall horizontal displacement of super large deep foundation pit supporting structure span centre and the displacement of non-span centre sidewall horizontal, provide effective control, for the safety of building operations provides guarantee.
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 calculus body; 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.
The specific embodiment
Below in conjunction with accompanying drawing explanation the specific embodiment of the present invention.
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 calculus body 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, the dispersed interior recess that is arranged on steel strand support 7 of steel strand 1, and steel strand 1 install 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 single steel strand 1 of anchorage cable anchoring section 13, formed single servo-actuated extruded sleeve, on every single steel strand 1 of anchorage cable anchoring section 13, the multiple servo-actuated extruded sleeves of equidistant installation, are just assembled into for 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, it is elongated that sleeve 21 is attenuated by External Force Acting, stone dead wire spring 22 is extruded, at sleeve 21 inwalls and steel strand 1 outside, squeeze out respectively internal thread and outer Si Siya, make sleeve 21 and steel strand 1 be bited into one, strengthened the tightness being connected between sleeve 21 and steel strand 1, in the sleeve 21 of steel strand 1 after extrusion modling, be to be difficult for departing from, 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, at the very thin plastic sheeting 31 of parcel one deck for circumferential outer surface of Compress Spring 3, give compressible spring 3 reserved movably slight compression space, pressure-bearing steel plate back-up ring 4 middle parts are provided with through hole, pressure-bearing steel plate back-up ring 4 is arranged on the rear end of locked instrument 2, and 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 penetrating hole 51, and fairlead 5 is sleeved on top steel wire bundle that many steel strand 1 form foremost, and guiding steel wire bundle is in anchor hole pushed, until push at the bottom of anchor cable hole hole foremost.With the steel strand 1 that hydraulic jack exposes apron piece 10 outsides, apply prestressing force and carry out stretch-draw, stretch-draw locks installation with anchor plate 8 and work anchor 9 during to design load, form anchor cable skeleton, anchor cable skeleton is arranged in anchor hole, and to anchorage cable anchoring section, 13 slip castings form calculus body 6.The slip casting calculus body 6 of this product is for having one or more taper table top reducing variable cross-section cylinders.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 at the interior cement grout that can effectively prevent the steel strand in anchorage cable stretching free segment 11 1 and inject in anchor hole of anchoring free end 11 and produces adhesion.
Every steel strand 1 in pressure-bearing steel plate back-up ring 4 and the anchorage cable anchoring section 13 of this product and compressible spring 3 and locked instrument 2 suits are integrated and have formed single mobile extruded sleeve, on single steel strand, multiple mobile extruded sleeves are installed, form monomer stress dispersion structure, every anchor cable is comprised of many steel strand, i.e. the every integrated stress dispersed structure that anchor cable is comprised of multiple monomer stress dispersion structures.Numerous single mobile extruded sleeves setting of staggering on many steel strand.Regenerated a stress dispersion structure.The anchor cable skeleton of assembled formation, its external diameter is all than the little 30-50mm of anchor hole diameter of anchorage cable stretching stretch-draw free segment; All than the little 40-80mm of diameter foremost under loose-leaf binder bearing plate locked instrument (patent of invention ZL20101007233.4) lock-out state, at the bottom of being convenient to enlarged footing anchor cable skeleton and being well in anchor hole and advancing 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 application, due to the anchor cable skeleton of this product steel wire bundle foremost, its diameter is the little 20-40mm of semicircle diameter width under lock-out state than the loose-leaf binder bearing plate foremost of the anchor cable skeleton in loose-leaf binder bearing plate enlarged footing anchor cable all, in anchor cable skeleton perforation procedure, due to the setting of fairlead, steel wire bundle can not produce and dryly scratches and hinder with hole wall foremost.Simultaneously, in steel wire bundle perforation procedure, conical guiding sleeve can and enclose extruding reaming to anchor hole periphery one by the shunting of drift sand mud, like this, steel wire bundle can push to smoothly the bottom of anchor hole projected depth under the effect of fairlead, makes anchor cable skeleton reach projected depth.Grouting Pipe is put into anchor cable skeleton simultaneously, and anchoring section is carried out to slip casting, after slip casting, and the newly-generated overall structure of steel strand, locked instrument, compressible spring, pressure-bearing steel plate back-up ring and slip casting calculus body weight; While applying prestressing force with the steel strand in jack pair enlarged footing anchor cable outside work anchor, first the pulling force that steel strand bear passes to apart from the locked instrument of steel strand end, by locked instrument, pass to compressible spring again, then pass to pressure-bearing steel plate back-up ring by Compress Spring.In like manner pass to successively last pressure-bearing steel plate back-up ring of anchorage cable anchoring section.The setting of Compress Spring, its effect is to cut down peak stress, can play the effect that buffering stress is cut down peak stress, prevent from directly the part of slip casting calculus body being squeezed broken when locked instrument is stressed, even the anchor cable after injection forming is applied to larger pulling force, can there is not break-off in steel strand in slip casting calculus body.
Elastic body steel strand when anchor cable is used, if apply stretching force to anchor cable, are extended equably.Utilize this character, in anchorage cable anchoring section, multiple servo-actuated extruded sleeves are installed, the size of root Ju stretching force, anchor cable produces corresponding elongation.Originally be, by the servo-actuated extruded sleeve of end, 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 second servo-actuated extruded sleeve of end, and stretching force is passed to second pressure-bearing steel plate back-up ring by compressible spring transition buffer.When stretching force reach regulation stretching force divided by the stretching force of the number gained of servo-actuated extruded sleeve more than 2 times time, the 3rd servo-actuated extruded sleeve of end passes to the 3rd loaded plate by stretching force by Compress Spring transition buffer, the rest may be inferred, stretching force is sequentially passed to N pressure-bearing steel plate back-up ring, and stretching force is just evenly dispersed like this.Between one end of pressure-bearing steel plate back-up ring and locked instrument, by the reserved removable space of spring outsourcing film is set, corresponding to prestressed size, pass to pressure-bearing steel plate back-up ring.
Like this, extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable just can bear larger prestressing force, and steel strand and the locked instrument that is combined into one with steel strand not can with slip casting calculus body generation break-off.The stretching force that the anchor cable of this product bears is compared with common anchor cable, and the tensile load bearing is multiplied, loss of prestress minimizing at double.The stretching force that the anchor cable of this product bears, compared with common anchor cable, can improve 50-70% left and right; The stretching force that the anchor cable of this product bears, compared with the common anchor cable of the extruding tapered end high tonnage of stress dispersion type, can improve 20-40% left and right; The common anchor cable of the extruding tapered end high tonnage of stress dispersion type, compared with common anchor cable, can improve 25-40% left and right; Common anchor cable when at jack pair, it applies prestressing force its loss of prestress up to 30-50%; Its loss of prestress is up to 15-25% when at jack pair, it applies prestressing force for the extruding tapered end high tonnage of stress dispersion type common anchor cable, 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 at jack pair, it applies prestressing force for the anchor cable of this product, and little 25-35% is wanted in its loss of prestress compared with common anchor cable; Little 10% left and right is wanted in its loss of prestress compared with the common anchor cable of the extruding tapered end high tonnage of stress dispersion type.Improved greatly 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 is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. an extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable, it is characterized in that: it comprises steel strand (1), locked instrument (2), Compress Spring (3), pressure-bearing steel plate back-up ring (4), fairlead (5), slip casting calculus body (6), steel strand support (7), anchor plate (8) and work anchor (9), described steel strand (1) install on steel strand support (7), described locked instrument (2), pressure-bearing steel plate back-up ring (4) and Compress Spring (3) are all installed on the steel strand (1) of anchorage cable anchoring section (13) and have formed servo-actuated extruded sleeve.。Described locked instrument (2) is integrated with steel strand (1) extruding, 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, described fairlead (5) be sleeved on many steel strand (1) form steel wire bundle foremost; The steel strand (1) that expose in apron piece (10) outside arrive design load through applying prestressing force, by anchor plate (8) and work anchor (9), lock installation again, the common anchor cable skeleton that forms, described anchor cable skeleton is arranged in the slip casting calculus body (6) of anchorage cable anchoring section (13).
2. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, is characterized in that: described locked instrument (2) comprises sleeve (21) and is installed on the spring (22) in sleeve (21); After described locked instrument (2) and steel strand (1) extrusion modling, 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); film for external surface (31) parcel of the external diameter circumference of Compress Spring (3); for Compress Spring (3) sets in advance out removable space, can protect reserved mobile space not enter herein or the 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, it is characterized in that: described locked instrument (2), Compress Spring (3) and pressure-bearing steel plate back-up ring (4) are all equidistantly installed on the every steel strand (1) in anchorage cable anchoring section (13), every place's pressure-bearing steel plate back-up ring (4) on every steel strand (1) in anchorage cable anchoring section (13), compressible spring (3) and locked instrument (2) form a servo-actuated extruded sleeve, on every steel strand (1) in anchorage cable anchoring section (13), equidistantly arrange and install multiple servo-actuated extruded sleeves, the upper structure that multiple servo-actuated extruded sleeves are installed of every steel strand (1) in anchorage cable anchoring section (13) forms stress distribution device, the upper multiple stress distribution devices of uniform installation of every steel strand (1) in described anchorage cable anchoring section (13), and the stress distribution device on adjacent steel twisted wire (1) is all staggeredly arranged.
5. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, it is characterized in that: the cross section of described steel strand support (7) is polygonal, 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).
6. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, is characterized in that: described fairlead (5) is for conical, and its central authorities are provided with penetrating hole (51).
7. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, is characterized in that: described extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable is applicable to anchorage cable anchoring section (13) the anchor cable of bonding or non-bending steel cable type.
8. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, is characterized in that: described slip casting calculus body (6) is for having the cylinder of one or more taper table tops.
9. extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable according to claim 1, is characterized in that: on the steel strand (1) of described anchorage cable stretching free segment (11), be set with steel strand gum cover (12).
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| CN104131561A (en) * | 2014-08-04 | 2014-11-05 | 中冶成都勘察研究总院有限公司 | Tensile support type anti-floating anchor structure |
| CN104480935A (en) * | 2014-11-18 | 2015-04-01 | 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 |
| CN110067247A (en) * | 2019-06-03 | 2019-07-30 | 河南省交通规划设计研究院股份有限公司 | Large deformation anchor cable and preparation method thereof for understable side slope |
| CN112282409A (en) * | 2020-09-07 | 2021-01-29 | 中国建筑第八工程局有限公司 | Top-supporting type carbon fiber prestress tensioning structure and tensioning method |
| CN114382078A (en) * | 2022-01-24 | 2022-04-22 | 福州大学 | Anchor cable bundle steel strand stress and deformation coordination member and use method thereof |
| CN114808695A (en) * | 2022-04-19 | 2022-07-29 | 国能神东煤炭集团有限责任公司 | Support anchor rope and fixed knot construct |
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| CN110067247A (en) * | 2019-06-03 | 2019-07-30 | 河南省交通规划设计研究院股份有限公司 | Large deformation anchor cable and preparation method thereof for understable side slope |
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| CN112282409A (en) * | 2020-09-07 | 2021-01-29 | 中国建筑第八工程局有限公司 | Top-supporting type carbon fiber prestress tensioning structure and tensioning method |
| CN114382078A (en) * | 2022-01-24 | 2022-04-22 | 福州大学 | Anchor cable bundle steel strand stress and deformation coordination member and use method thereof |
| 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 |
| CN114808695A (en) * | 2022-04-19 | 2022-07-29 | 国能神东煤炭集团有限责任公司 | Support anchor rope and fixed knot construct |
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