CN104213509B - A kind of cable hoisting anchor cable formula anchorage construction method - Google Patents
A kind of cable hoisting anchor cable formula anchorage construction method Download PDFInfo
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Abstract
The invention discloses a kind of cable hoisting anchor cable formula anchorage construction method, in the anchorage region determined, first excavation table soil exposes face, fresh rock stratum, face, rock stratum digs into the height vertical not less than 2m and rinses well, being then close to face, rock stratum placing intensity and meet the rectangle anchor body of requirement；Hole on anchor body and rock mass again；Behind clear hole, in each anchor hole, put into anchor cable, carry out slip casting in hole in time；When cast mortar strength reaches design load, more pre-tensioner anchor cable；After anchor cable pretension, by the anchor cable exposed, distribution anchor beam is installed in anchor body front, distribution anchor beam fixedly mounts pulley base by seat arm-tie again, then by pulley base, main rope, knotted rope and working cable is installed；Funicular system is installed after putting in place, can lift.The present invention can be greatly simplified lifting construction process, preferably ensures construction safety, saves duration and cost.
Description
Technical field
The present invention relates to arch bridge construction prestressed cable technological improvement, refer specifically to a kind of cable hoisting anchor cable formula anchorage construction method, belong to technical field of bridge construction.
Background technology
Construction prestressed cable technology has been widely used in science of bridge building, wherein uses prestressed anchor Cable Structure to prove that prestress anchorage cable Technology application is safe and reliable in the anchorage structures of large-scale hoisting facilities as the successful engineering experience of anchor chain-formed anchor of cable crane.But this technology is limited by topographic and geologic condition when reality is applied, anchorage position buried depth of bedrock should not use time deeper.Different base rock condition, need on-the-spot anchor force test data, need special facility to carry out the series of factors requirements such as construction, select anchor cable formula Bower Anchor heavy stone used as an anchor to need the most specifically to study.Pylon is typically the important force structure part of funicular system, and the cable crane pylon withholding one constructs and stress is increasingly complex, and in construction, security risk is very big, needs Specialty Design.
Bridge has quite a few to be to build under mountain area particularly river valley, valley orographic condition.Bridge two sides may there is a need to the highway connected, it is also possible to is directly connected to tunnel.If with the presence of highway, when construction prestressed cable, arrange that hoisting tower not only will tie up the driving width of existing highway, also will greatly reduce construction operation space routinely simultaneously, society's vehicular traffic safety during lifting, will be had a strong impact on.And select the structural forms such as gravity type or the ground ridge formula Bower Anchor heavy stone used as an anchor of routine, pledge excavation quantities is big, must interrupt road during construction.
Summary of the invention
For deficiencies of the prior art, it is an object of the invention to provide a kind of cable hoisting anchor cable formula anchorage construction method, this method is specifically designed for V-arrangement valley river valley landform and designs, can be greatly simplified lifting construction process, preferably ensure construction safety, save duration and cost.
The technical scheme is that and be achieved in that:
Cable hoisting anchor cable formula anchorage construction method, this method is applicable between V-arrangement valley build arch bridge, and valley angle is less than 90 degree；Specifically comprise the following steps that
1) anchorage position determines: determine anchorage construction position often organizing respectively on the massif of arch rib two sides, and anchorage is for installing the cable two ends including lifting main rope, and anchorage height guarantee main rope lifting arch rib to rope main rope minimum point when span centre is positioned on vault；
2) anchor body concrete construction: in the anchorage region determined, first excavation table soil exposes face, fresh rock stratum, face, rock stratum digging into height not less than the vertical of 2m and rinse well, be then close to face, rock stratum placing intensity and meet the rectangle anchor body of requirement, corresponding arch rib center, anchor body center is the most right；
3) boring, clear hole: after anchor body maintenance reaches design strength, outside anchor body concrete, 3-8 ° obliquely (preferably 5 °) uniformly some anchor holes of ground auger are to projected depth, repeatedly use high-pressure blast aperture blowing after pore-forming, clean residue and water body on hole wall, to strengthen the cementitiousness of rock mass；
4) anchor cable is installed: behind the clear hole of anchor hole, puts into anchor cable immediately in each anchor hole, carries out slip casting in hole in time, make anchor cable fix as one with anchor hole；Anchor cable exposes certain length, installs for subsequent allocations anchor beam；
5), when cast mortar strength reaches design load more than 100%, start to make anchor cable be able to by cable stretching anchor cable pre-tensioner；After anchor cable pretension, by the anchor cable exposed, distribution anchor beam is installed in anchor body front, fixedly mounting pulley base by seat arm-tie again on distribution anchor beam, described pulley base is made up of main rope pulley base, knotted rope pulley base and working cable pulley base, and main rope pulley base is positioned at distribution anchor beam center；Knotted rope pulley base has two groups be symmetrically set in main rope pulley base both sides and be positioned at distribution anchor beam two ends, and working cable pulley base is between main rope pulley base and inner side knotted rope pulley base；
6) installation of funicular system: install main rope, knotted rope and working cable by corresponding pulley base respectively on the anchor body often organizing arch rib two sides；
7) lifting of arch rib: funicular system is installed after putting in place, arch rib section to be lifted can be suspended on main rope by hoist cable, then draws to installation site；Wherein knotted rope hangs for being drawn by the arch rib having been mounted to position.
Further, described anchor hole is formed by the anchor hole on anchor body and the anchor hole two parts on rock mass, and wherein the hole depth on rock mass is not less than 20 meters；Being set with steel pipe on the anchor cable on top layer and form free segment, steel pipe length is more than anchor body thickness, and free segment is not poured into a mould；Remaining anchor cable constitutes anchoring section, and cast is only carried out on anchoring section.
Anchor cable in each anchor hole is worked out by 6～10 15.24mm high intensity low relaxation steel strand wires.
Further, anchoring section is formed corrugated by expansion locating ring and contraction locating ring colligation, and wavelength takes 1m；Use when anchorage cable stretching each steel strand wires of corrugated form to stretch trend, slurry around is produced extruding, friction effect very favorable to anchorage cable anchoring can be produced.
Described 4th) step anchor hole slip casting uses method construction at the bottom of a secondary aperture, and serosity is M40 cement mortar, uses ordinary cement slurrying, and ratio of mud 0.38-0.4, extender 10%, injection pressure is 0.4Mpa～0.6Mpa.
Bridge superstructure installation of the present invention is according to favorable factors such as the precipitous landform in two sides, V-arrangement valley, good geological conditions, complete massif structures, cable is anchored on the massif of two sides the suitable elevation location being equivalent to existing pylon cable saddle, use prestressed cable anchorage Bower Anchor heavy stone used as an anchor and distribution anchor beam, distribution anchor beam arranges the structures such as pulley base again and can hang cable system.Owing to taking without Deethanizer design and prestressing force cable-styled Bower Anchor heavy stone used as an anchor technology, make lifting construction process greatly simplified, registration after button extension, construction safety be can preferably ensure, duration and cost saved.Use anchor cable formula Bower Anchor heavy stone used as an anchor excavation project amount little, to highway interference minimum.
Accompanying drawing explanation
Fig. 1-CABLEWAY ERECTION SYSTEM general arrangement of the present invention.
Fig. 2-CABLEWAY ERECTION SYSTEM general layout top view of the present invention.
Fig. 3-CABLEWAY ERECTION SYSTEM anchor structure figure of the present invention.
Fig. 4-CABLEWAY ERECTION SYSTEM anchor structure end view drawing of the present invention.
Fig. 5-prestress anchorage cable structural map of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Cable hoisting anchor cable formula anchorage construction method of the present invention builds arch bridge under the conditions of being applicable to V-arrangement valley, river valley topographic and geologic, and valley angle is less than 90 degree；Both tower construction method can have been used, it would however also be possible to employ without tower construction method, be embodied as step without tower construction as follows during construction:
1) anchorage position determines: determine anchorage construction position often organizing respectively on arch rib two sides massif 1, and anchorage is for installing the cable two ends including lifting main rope, and anchorage height guarantee main rope lifting arch rib to rope main rope minimum point when span centre is positioned on vault；Different according to bridge deck width, arch rib quantity is the most different, usually 2-3 group.Assume that arch rib is N number of, then N number of anchorage on the massif of two sides, will be respectively provided with.When anchorage position determines, in addition to height and right position, in addition it is also necessary to consider the strata structure etc. of this position, to ensure that rock mass can bear the pulling force of Lift-on/Lift-off System.On the premise of ensureing structural strength, position can suitably be moved.
2) anchor body concrete construction: in the anchorage region determined, first excavation table soil exposes face, fresh rock stratum, face, rock stratum is dug into the height vertical 2 not less than 2m and rinses well, then being close to face, rock stratum placing intensity and meet the rectangle anchor body 3 of requirement, corresponding arch rib center, anchor body 3 center is the most right；Note bar-mat reinforcement and the most pre-buried and location of noose pipe under anchor simultaneously；
In embodiment anchor body be high 2m, thick 1m, the C30 concrete of long 6 m.
3) boring, clear hole: after anchor body 3 maintenance reaches design strength, outside anchor body concrete, 3-8 ° obliquely (preferably 5 °) uniformly some anchor holes of ground auger are to projected depth.Repeatedly use high-pressure blast aperture blowing after pore-forming, clean residue and water body on hole wall, to strengthen the cementitiousness of rock mass.
In addition to the anchor hole on anchor body, also including the anchor hole on rock mass, wherein the hole depth on rock mass is not less than 20 meters, and the degree of depth during i.e. anchor cable anchors into basement rock is more than 20 meters, to guarantee weak weathered stratum in the embedding of effective anchored end, it is ensured that intensity.
Anchor hole size should consider anchor cable diameter, again in view of grouting amount, and actual diameter 90mm, use the pneumatic construction of hidden hole drilling dry drill method.
4) anchor cable is installed: behind the clear hole of anchor hole, put into anchor cable 4 immediately, carry out slip casting in hole in time, make anchor cable fix as one with anchor hole in each anchor hole；Anchor cable 4 exposes certain length, installs for subsequent allocations anchor beam.
Anchor hole slip casting uses method construction at the bottom of a secondary aperture, and serosity is M40 cement mortar, uses ordinary cement slurrying, and ratio of mud 0.38-0.4, extender 10%, injection pressure is 0.4Mpa～0.6Mpa.
Anchor cable in each anchor hole is worked out by 6～10 15.24mm high intensity low relaxation steel strand wires.Before anchor cable establishment, every steel strand wires close inspection must not to be used the material that dog leg, mechanical damage and serious corrosion, electric burn etc. cause intensity to reduce.
5), when cast mortar strength reaches design load more than 100%, start to make anchor cable be able to by cable stretching anchor cable pre-tensioner.Stretch-draw capital equipment is YC250 punching jack, through there being the unit of qualification to demarcate before using.In actual design, tension of prestressed tendon design strength is σcon=0.43%fptk=
The anchorage cable design stretching force of 800Mpa, i.e. anchor body both sides is 67.2T, and middle part anchorage cable design stretching force is 112 tons.Stressing sequence is: 0 → initial stress → σconHold lotus 5min anchoring.
Anchorage destroys and means that failure of cable, is related to the safety of engineering, tackles anchorage safekeeping during use, for preventing anchored end intermediate plate from getting loose, uses pressing plate to be close to the protective measures such as intermediate plate before taking work anchor slab.
After anchor cable 4 pretension, by the anchor cable exposed, distribution anchor beam 5 is installed in anchor body 3 front, distribution anchor beam 5 fixedly mounts pulley base 6 by seat arm-tie again, between seat arm-tie and distribution anchor beam, uses high-strength bolt to be attached.Described pulley base is made up of main rope pulley base, knotted rope pulley base and working cable pulley base, and main rope pulley base is positioned at distribution anchor beam center；Knotted rope pulley base has two groups be symmetrically set in main rope pulley base both sides and be positioned at distribution anchor beam two ends, and working cable pulley base is between main rope pulley base and inner side knotted rope pulley base.
The present invention is with the anchorage separate design of bank, and each anchorage design 2 × 3 rope steel hinge line anchor cable fixes shaped steel distribution anchor beam, and wherein middle 2 × 1 anchor cables are 10 φ 15.24 steel hinge lines, and it is 6 φ 15.24 steel hinge lines that both sides are respectively 2 × 1 anchor cables；Anchor cable uses standard pull tension intensity Ryb=1860Mpa, Ey=1.95 × 105Mpa, relaxation rate meet II grade of high strength low relaxed steel strand wires of φ 15.24 required.
Fig. 3 and Fig. 4 is CABLEWAY ERECTION SYSTEM anchor structure figure of the present invention.
6) installation of funicular system: install main rope 7, knotted rope 8 and working cable 9 by corresponding pulley base respectively on the anchor body often organizing arch rib two sides, anchor whole cableway system.
Hoisting with Cableway System often to be organized cable crane examination and hang after making and installing, employing reinforcing bar counterweight is hung in examination, carries out examination with 120% tonnage of maximum lifting weight and hangs (such as arch rib maximum sections gross weight 22.6 tons, then examination lift heavy amount is exactly 27 tons).In whole hoisting process, system unit each to anchorage and cable checks, debugs the most properly functioning parts, it is ensured that properly functioning during lifting.
7) lifting of arch rib: funicular system is installed after putting in place, arch rib section to be lifted can be suspended on main rope by hoist cable, then draws to installation site；Wherein knotted rope hangs for being drawn by the arch rib having been mounted to position.
The present invention is set with steel pipe 10 on the anchor cable 4 on top layer and forms free segment, and steel pipe length is more than anchor body thickness, and free segment is not poured into a mould；Remaining anchor cable constitutes anchoring section, and cast is only carried out on anchoring section.Anchoring section is formed corrugated by expansion locating ring 11 and contraction locating ring 12 colligation simultaneously, and wavelength takes 1m.Use when anchorage cable stretching each steel strand wires of corrugated form to stretch trend, slurry around is produced extruding, friction effect very favorable to anchorage cable anchoring can be produced.Fig. 5 is prestress anchorage cable structural map.
The present invention, through adjustment to funicular system general layout, increases suspension cable span, and hoisting depth, takes direct anchorage style after former cable saddle's position, anchorage passes through prestressed cable anchorage in basement rock, defines without tower anchor cable formula CABLEWAY ERECTION SYSTEM.Fig. 1 and Fig. 2 is cable hoisting anchor cable formula anchorage system general arrangement of the present invention.
Anchor cable formula Bower Anchor heavy stone used as an anchor stressing conditions is more complicated, bear dead load with conventional rock bolting rope compared with, have dynamic loading at anchor head, it is therefore desirable to enough safety stocks, it is ensured that anchoring safety.When the position of design distribution anchor beam seat of honour arm-tie and anchoring pulley, it should be noted that the load direction making cable crane transmission keeps consistent with anchor cable axis as far as possible, and distribution anchor beam wants effective Transfer of Shear with anchor body concrete structure, it is ensured that anchor cable axis tension.
Present invention lifting is forced through anchorage (size, structure), anchor cable (length, thickness, structure), cable etc. and ensures, it is desirable to loosening and deformation in use can not occur in rock anchor system.During practical operation, after each key element determines, anchor cable maximum pull to be carried out calculates and anchor cable safety coefficient checks.The present invention is in use, cable crane is working properly, main rope sag is the most identical with design calculation result, loosening and deformation does not in use occur in rock anchor system, show that cable crane anchor cable formula Bower Anchor heavy stone used as an anchor mentality of designing of the present invention and computational methods subjected to the inspection of practice, provide guarantee for arch bridge smooth construction.
Finally it should be noted that, above example is only in order to illustrate technical scheme and unrestricted, although the present invention has been described in detail by applicant with reference to preferred embodiment, it will be understood by those within the art that, technical scheme is modified or equivalent, without deviating from objective and the scope of the technical program, all should contain in the middle of scope of the presently claimed invention.
Claims (5)
1. cable hoisting anchor cable formula anchorage construction method, it is characterised in that: this method is applicable between V-arrangement valley build arch bridge, and valley angle is less than 90 degree；Specifically comprise the following steps that
1) anchorage position determines: determine anchorage construction position often organizing respectively on the massif of arch rib two sides, and anchorage is for installing the cable two ends including lifting main rope, and anchorage height guarantee main rope lifting arch rib to rope main rope minimum point when span centre is positioned on vault；
2) anchor body concrete construction: in the anchorage region determined, first excavation table soil exposes face, fresh rock stratum, face, rock stratum digging into height not less than the vertical of 2m and rinse well, be then close to face, rock stratum placing intensity and meet the rectangle anchor body of requirement, corresponding arch rib center, anchor body center is the most right；
3) boring, clear hole: after anchor body maintenance reaches design strength, outside anchor body concrete, the 3-8 ° of some anchor hole of uniform ground auger, to projected depth, uses high-pressure blast aperture blowing repeatedly after pore-forming obliquely, cleans residue and water body on hole wall, to strengthen the cementitiousness of rock mass；
4) anchor cable is installed: behind the clear hole of anchor hole, puts into anchor cable immediately in each anchor hole, carries out slip casting in hole in time, make anchor cable fix as one with anchor hole；Anchor cable exposes certain length, installs for subsequent allocations anchor beam；
5), when cast mortar strength reaches design load more than 100%, start to make anchor cable be able to by cable stretching anchor cable pre-tensioner；After anchor cable pretension, by the anchor cable exposed, distribution anchor beam is installed in anchor body front, fixedly mounting pulley base by seat arm-tie again on distribution anchor beam, described pulley base is made up of main rope pulley base, knotted rope pulley base and working cable pulley base, and main rope pulley base is positioned at distribution anchor beam center；Knotted rope pulley base has two groups be symmetrically set in main rope pulley base both sides and be positioned at distribution anchor beam two ends, and working cable pulley base is between main rope pulley base and inner side knotted rope pulley base；
6) installation of funicular system: install main rope, knotted rope and working cable by corresponding pulley base respectively on the anchor body often organizing arch rib two sides；
Funicular system often to be organized cable crane examination and hang after installing, employing reinforcing bar counterweight is hung in examination, carries out examination with 120% tonnage of maximum lifting weight and hangs；During whole examination is hung, system unit each to anchorage and cable checks, debugs the most properly functioning parts, it is ensured that properly functioning during lifting；
7) lifting of arch rib: funicular system is installed after putting in place, arch rib section to be lifted can be suspended on main rope by hoist cable, then draws to installation site；Wherein knotted rope hangs for being drawn by the arch rib having been mounted to position.
Cable hoisting anchor cable formula anchorage construction method the most according to claim 1, it is characterised in that described anchor hole is formed by the anchor hole on anchor body and the anchor hole two parts on rock mass, and wherein the hole depth on rock mass is not less than 20 meters；Being set with steel pipe on the anchor cable on top layer and form free segment, steel pipe length is more than anchor body thickness, and free segment is not poured into a mould；Remaining anchor cable constitutes anchoring section, and cast is only carried out on anchoring section.
Cable hoisting anchor cable formula anchorage construction method the most according to claim 2, it is characterised in that the anchor cable in each anchor hole is worked out by 6～10 15.24mm high intensity low relaxation steel strand wires.
Cable hoisting anchor cable formula anchorage construction method the most according to claim 3, it is characterised in that anchoring section is formed corrugated by expansion locating ring and contraction locating ring colligation, and wavelength takes 1m；Use when anchorage cable stretching each steel strand wires of corrugated form to stretch trend, slurry around is produced extruding, friction effect very favorable to anchorage cable anchoring can be produced.
Cable hoisting anchor cable formula anchorage construction method the most according to claim 1, it is characterized in that, described 4th) in step hole, slip casting uses method construction at the bottom of a secondary aperture, serosity is M40 cement mortar, use ordinary cement slurrying, ratio of mud 0.38-0.4, extender 10%, injection pressure is 0.4Mpa～0.6Mpa.
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| CN110439005B (en) * | 2019-06-24 | 2020-05-01 | 中国地质大学（武汉） | Anchor cable structure used in soft and hard interbedded rock mass and construction method thereof |
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