CN102619226B - Pressure dispersion type yielding anchor cable - Google Patents
Pressure dispersion type yielding anchor cable Download PDFInfo
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- CN102619226B CN102619226B CN201210116464.XA CN201210116464A CN102619226B CN 102619226 B CN102619226 B CN 102619226B CN 201210116464 A CN201210116464 A CN 201210116464A CN 102619226 B CN102619226 B CN 102619226B
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Abstract
The invention discloses a pressure dispersion type yielding anchor cable. The pressure dispersion type yielding anchor cable comprises an inner anchoring section, a free section and an outer anchoring section, wherein the inner anchoring section comprises multiple levels of inner anchoring bearing bodies; n is an integer not less than 2; each inner anchoring bearing body comprises a bearing plate, a sealing shell and at least two yielding anchorage devices arranged between the bearing plate and the sealing shell; and a constant-resistance body of each yielding anchorage device is connected with an inhaul cable which passes through the bearing plate. The anchor cable disclosed by the invention can prevent a single inhaul cable from being snapped efficiently when over-great bearing force is applied to the inhaul cable, the loading capability of the whole yielding anchor cable after resisting earthquake is not changed, and the yielding anchor cable can be stretched-drawn integrally for once, so that convenience is provided for construction; a dispersion type anchoring way is adopted, so that the size of a drilling hole is small and good economical efficiency is obtained; and the pressure dispersion type yielding anchor cable, disclosed by the invention, is suitable for multiple stratum conditions and in particular for the anchoring of rock soil in earthquake regions and high-pressure deformation conditions.
Description
Technical field
The present invention relates to a kind of anchor cable structure for ground anchorage, especially relate to a kind of pressure dispersing type and allow pressure anchor cable.
Background technology
One of Main Means of rock-reinforcing is by anchor pole or anchorage cable anchoring, and the loading characteristic of both anchorings is that the distortion of anchor cable must be coordinated mutually with the distortion of Rock And Soil, and as the deflection of rock mass has exceeded the maximum deformation quantity that anchor cable allows, anchor cable can be pulled off.
Surrender anchor pole or anchor cable device are a kind of anchor pole or anchor cables that can maintain predetermined anchored force and can form again certain " distortion " amount and eliminate vibration energy or adaptive deformation, are out of shape anchor pole (rope), pressure-relieving achor bar (rope) also referred to as surrender anchor pole (rope), constant-resistance.In geotechnical engineering, conventional surrender anchor pole or anchor cable device be for the Deformation control of deep formation rock burst or large deformation, geotechnical slope and foundation ditch etc., seemingly " bullet is moulded " property of the overall stress of surrender anchor pole or anchor cable device.In the time that the deflection of rock mass makes the pulling force of anchor pole or anchor cable exceed design yield force, it is the same that anchor bar body between interior anchoring section and outer anchoring section or anchor cable are known from experience the tension test that automatic " elongation " erect image does steel in the situation that keeping pulling force constant, tensile stress reaches yield limit, pulling force is constant, and the body of rod increases.
Chinese patent 200910190942.X discloses a kind of quake-proof anchor rope, comprise free segment and anchoring section, anchoring section arranges antidetonation anchor device, antidetonation anchor device comprises loaded plate, antidetonation ground tackle and permanent ground tackle, anchor cable is through loaded plate and successively through antidetonation ground tackle and permanent ground tackle, and antidetonation ground tackle is the slidably extruded sleeve structure of setting maximum anchored force, and antidetonation ground tackle is pressed on loaded plate inner side, permanent ground tackle is standard extruded sleeve, between permanent ground tackle and antidetonation ground tackle, a determining deviation is set.The anchor point of this patent concentrates on anchor cable afterbody loaded plate, and many anchor cable muscle are isometric setting, and antidetonation ground tackle is extruded sleeve structure slidably, and its internal circular surfaces arranges anti-slip veins.
Chinese patent application 201110157137.4 discloses a kind of constant resistance and large deformation cable and permanent resistance install thereof, this constant resistance and large deformation cable comprises cable, ground tackle, loaded plate and intermediate plate, described ground tackle and loaded plate are fixed on by intermediate plate in the upper end of described cable, it also comprises permanent resistance install, described permanent resistance install comprises sleeve pipe and constant-resistance body, described sleeve pipe is straight tube structure, and described constant-resistance body is frustum structure, and the diameter of the lower end surface of described constant-resistance body is greater than the diameter of its upper end end face; The internal diameter of described sleeve pipe is less than the diameter of the lower end surface of described constant-resistance body, and the bottom of described internal surface of sleeve pipe is provided with wedge-shaped part, and described constant-resistance body is located at described wedge-shaped part; The intensity of described constant-resistance body be greater than described sleeve pipe intensity so that described constant-resistance body in the time of described cover in-pipe described in the constant and described sleeve pipe generation of constant-resistance shape plastic strain; The lower end of described cable is fixed on described constant-resistance body.
The disclosed anchor cable of above-mentioned patent belongs to pressure concentration type anchor cable, its shortcoming is that anchor point is concentrated, anchoring section is subject to load excessive, the stressed meeting of injecting cement paste large-tonnage under loaded plate causes the problem of strength deficiency, and loaded plate size is large, cause that the general anchor cable of anchor cable aperture ratio is large, cost is high, and is mainly adapted to the stratum that rock strength is high.
Chinese patent application 200910178416.1 discloses a kind of inner anchoring carrying body of pressure dispersing anchorage cable, the inner anchoring carrying body of this pressure dispersing anchorage cable, be provided be vertically fixed on outer anchorage head to the many groups bearing assembly distributing and some upper ends vertical to drag-line, be distributed in different bearing assemblies some vertically grouping to drag-line lower end, and relative fixing with the pressure-bearing post of corresponding group of bearing assembly respectively, its major technique improvement is that the pressure-bearing post in bearing assembly is up-small and down-big round table-like sphenoid, described drag-line passes downwards successively in the pressure-bearing cylinder of each bearing assembly, to downward-extension and be individually fixed in the lower end of corresponding group pressure-bearing post.
Chinese patent application 201110274993.8 discloses a kind of tune rigidity deformation box type pressure dispersing anchorage cable, comprise the loaded plate arranging in anchor hole, the Extrusion anchor ground tackle of loaded plate one side and through Grouting Pipe and one or the above anchor cable muscle body of Extrusion anchor ground tackle and loaded plate, in anchor hole, be also provided with two or more tune rigidity distortion boxes, described tune rigidity distortion box comprises the loaded plate set casing that is provided with opening and the portable plate that is positioned at opening part, the outside of described portable plate is provided with Extrusion anchor ground tackle, between the inner side of portable plate and loaded plate set casing, be provided with multiple tune rigid springs, described Grouting Pipe and anchor cable muscle body are through loaded plate set casing and portable plate.
Although above-mentioned pressure dispersing anchorage cable is by arranging multistage inner anchoring carrying body, improved the interior anchor section of operation working stage pressure distribution, solved the problems such as injecting cement paste stress is too concentrated, drag-line pulling force is even not, can be applied in the good not soil layer of condition, press anchor cable after Cable forces deformation, can not keep constant bearing capacity threshold value but above-mentioned two pressure dispersing types allow.
Chinese patent application 201110091753.4 discloses one and has allowed pressure ground tackle, comprises extrusion head, allows gland cylinder and the dowel, described extrusion head be the cylinder of bottom with the conical surface, is flexibly connected integral with dowel; Described extrusion head is placed in and allows in gland cylinder, allows and presses sleeve lining to be provided with the raised face (RF) matching with the conical surface of extrusion head bottom, allows gland cylinder be preferably the steel pipe of inwall with lug, nib, and the end of lug, nib is the raised face (RF) matching with the conical surface of extrusion head.
Summary of the invention
The invention provides a kind of pressure dispersing type and allow pressure anchor cable, there is the characteristic of constant resistance and large deformation, can be in the time that drag-line exceedes working load, keep this constant force plastic flow, make this anchor cable " elongated ", thereby improved overall ductility and energy dissipating and the impact load performance of anchor cable, allow and press anchor cable entirety ductility deficiency to solve existing pressure dispersing type, discontinuity between drag-line, the problem being easily pulled off in the time that bearing tension is excessive.
A kind of pressure dispersing type allows pressure anchor cable, comprise interior anchor section, free segment and outer anchor section, described interior anchor section comprises n level inner anchoring carrying body, n is not less than 2 integer, described inner anchoring carrying body comprises that loaded plate, capsule and between the two at least two allow pressure ground tackle, and each allowing presses the constant-resistance body of ground tackle to be connected with a drag-line that passes loaded plate.
The loaded plate side face of m level inner anchoring carrying body is provided with the depression for locating all drag-lines of 1st～m-1 level inner anchoring carrying body, m is integer, and 2≤m≤n, to prevent drag-line tied up in knots, for positioning better, the capsule outer peripheral face of this grade of inner anchoring carrying body is provided with depression equally accordingly.
The described pressure ground tackle that allows is in loaded plate motion process, can move the device that produces constant resistance at drag-line to drag-line.It can adopt structure as disclosed in CN 102182182A, and this allows presses ground tackle to comprise to allow gland cylinder and allow constant-resistance body in gland cylinder, and drag-line is fixedly connected with constant-resistance body.Adopt this structure, specifically can further adopt following two schemes:
Described constant-resistance body is that entirety or head are frustum structure, and the described changeover portion and the section of stopping that allow gland cylinder be matched by cavity segment, inner peripheral surface and constant-resistance body form, and can be also to be only made up of changeover portion and the section of stopping;
Or described constant-resistance body is the tapered cylindrical structure of head, the described gland cylinder that allows is made up of cavity segment and the section of stopping, the head of constant-resistance body stretches in the section of stopping.Preferably, the described section of stopping inner chamber has the convex tendon of axial setting, is conducive to stop the moulding deformation of the rear generation of Duan Yu constant-resistance body extruding.
Preferably, described drag-line is fixedly connected with described constant-resistance body by end anchor, and end anchor is standard component, and the relative constant-resistance body of its stay guy is static, simple in structure, easy to assembly.
Described allowing presses ground tackle can also adopt following scheme:
Described allowing presses ground tackle to comprise at least two arc clips around drag-line in compression sleeve and compression sleeve, and described arc clip internal face is exasperate structure, and it clamps drag-line by the extruding of compression sleeve.With respect to the disclosed pressure ground tackle that allows of CN 101666093B, allowing of this kind of structure presses ground tackle to have the advantages that resistance is large, because the disclosed pressure ground tackle that allows of CN 101666093B, it mainly utilizes the friction between gland cylinder and drag-line to produce resistance, the outside active force radially not applying, so frictional resistance is little, and wayward, and in structure of the present invention, the hardness of compression sleeve is less than the hardness of arc clip, in manufacture process, first three is coaxially set on together, then push compression sleeve, make compression sleeve apply active force radially to arc clip, can greatly increase the frictional resistance between arc clip and drag-line.
Described exasperate structure can be corrugated surface structure, in order to limit the drag-line slippage excess of stroke, is provided with end anchor at stay cable end.
Certainly allow and press ground tackle also can also adopt structure as disclosed in CN 101666093B, allowing and pressing ground tackle is the slidably extruded sleeve structure that inner peripheral surface is established antiskid thread, and allowing and pressing ground tackle and drag-line is socket.
Press ground tackle to adopt structure as disclosed in CN 102182182A when allowing, described capsule can be laminated structure, allows gland cylinder two ends and capsule and loaded plate be sealed and matched.
Press ground tackle to adopt the compression sleeve structure of slip when allowing, each allowing pressed the outer sheathed one section of pillar of ground tackle, and pillar entangles end anchor and compression sleeve, and two ends coordinate with pressure-bearing surface and the envelope encapsulates of loaded plate respectively.
Capsul can adopt CN 101666093B, the disclosed structure of CN 102296604A, and described capsule can be seal closure structure, and it and loaded plate are sealed and matched to form to contain to allow and press the seal chamber of ground tackle.
In peer of the present invention, in anchoring carrying, respectively allow and press the constant-resistance of ground tackle allow to press load threshold value to approach, error range operated by rotary motion within 5%, in the time that single cable is subject to pulling force to exceed this threshold value, drag-line generation slippage, otherwise slippage does not occur; When slippage all occurs all drag-lines, the free segment of anchor cable extends, and can play the effect of antidetonation; But as long as wherein slippage does not occur a drag-line, free segment can not extend.Therefore anchor cable of the present invention can effectively prevent that bearing capacity is excessive to be pulled off single cable owing to being subject to, and finally allows the weight bearing power of pressure anchor cable entirety can not change.
Allowing on single-stage inner anchoring carrying body presses ground tackle quantity to determine the bearing capacity of this grade of supporting body, quantity is larger, bearing capacity is higher, structure is more complicated, be traditionally arranged to be 2～9, be preferably, described allowing presses ground tackle to be uniformly distributed on the circumference taking loaded plate center as the center of circle, makes the distribution of force of loaded plate more even.More preferably, all inner anchoring carrying bodies coaxially arrange, and all drag-lines are uniformly distributed on the same circumference taking inner anchoring carrying body axle center as the center of circle, can make the stressed more even of all drag-lines.
Described drag-line outer cover is provided with plastic bushing, is filled with anticorrosion grease between plastic bushing and drag-line, and the plastic bushing slippage relatively of anticorrosion grease drag-line is set, and is subject to plastic bushing protection, can not be subject to the corrosion on stratum.
Drag-line generally adopts steel strand; for improving intensity; be preferably; described drag-line is composited by carbon fiber and glass fiber; outer setting separation layer, separation layer can be heated bitumen and geotextiles integument or plastic pipe, separation layer shields on the one hand; on the other hand by drag-line and the isolation of native injecting cement paste, drag-line slippage relatively.
The progression of inner anchoring carrying body arranges according to actual needs, and generally at 2～6 grades, the axial distance between adjacent two-stage inner anchoring carrying body also should arrange according to actual needs, is generally 1.5～12m, and axial distance can be set to identical or different.
Described allowing presses the front end of anchor cable to be provided with guide head, in anchor cable installation process, play the guiding role.
Pressure dispersing type of the present invention allows pressure anchor cable, has that constant resistance and large deformation, anti-seismic performance and Suo Li cross limit and overall Suo Li regulates uniform feature; This allows presses the anchor cable can Integratively stretch-draw, easy construction; Because disperseing anchoring, bore size is little, and good economy performance is applicable to multiple formation condition, is particularly useful for the ground anchorage of earthquake zone and high pressure deformation condition.
Brief description of the drawings
Fig. 1 is that pressure dispersing type of the present invention allows and presses the structural representation of anchor cable;
Fig. 2 allows shown in Fig. 1 press anchor cable A-A sectional drawing;
Fig. 3 allows shown in Fig. 1 press anchor cable B-B sectional drawing;
Fig. 4 allows shown in Fig. 1 press anchor cable C-C sectional drawing;
Fig. 5 allows shown in Fig. 1 press anchor cable D-D sectional drawing;
Fig. 6 is a kind of example structure schematic diagram of the inner anchoring carrying body of apparatus of the present invention;
Fig. 7 is the part sectioned view of inner anchoring carrying body shown in Fig. 6;
Fig. 8 is the cross-sectional configuration schematic diagram that allows gland cylinder of apparatus of the present invention;
Allowing in the inner anchoring carrying body of Fig. 9 apparatus of the present invention pressed the another kind of embodiment part sectioned view of ground tackle;
Figure 10 is the sectional drawing that allowing shown in Fig. 9 pressed ground tackle F-F;
Figure 11 is the structural representation of another kind of drag-line;
Figure 12 has three to allow and press the sectional drawing of anchoring carrying body of ground tackle;
Figure 13 has four to allow and press the sectional drawing of anchoring carrying body of ground tackle;
Figure 14 has six to allow and press the sectional drawing of anchoring carrying body of ground tackle, and wherein several drag-lines omit not shown;
Figure 15 is that existing allowing presses anchor cable and the present invention allow to press the pulling force-deformation behaviour curved line relation curve of anchor cable in the time of non-prestressed work;
Figure 16 is that existing allowing presses anchor cable and the present invention allow to press the pulling force-deformation behaviour curved line relation curve of anchor cable in the time that prestressing force is worked.
Detailed description of the invention
As shown in Figure 1, a kind of pressure dispersing type allows pressure anchor cable, comprises interior anchor section 10, free segment 20 and outer anchor section 30, wherein in anchor section 10 formed by two-stage inner anchoring carrying body, certainly can adjust the progression of inner anchoring carrying body according to actual needs, be generally 2～6 grades.For the ease of anchor cable is packed in anchor cable hole 50, allow and press ground tackle front end to have guide head 40.
As shown in Figures 6 and 7, every grade of inner anchoring carrying body is made up of loaded plate 100, capsule 300 and the pressure ground tackle 200 that allows between the two with pressure-bearing surface 101.Each allowing presses ground tackle to be connected with a drag-line 202 through loaded plate 100.In the present embodiment, in every grade of inner anchoring carrying body, allowing and pressing the quantity of ground tackle 200 is 3, and each allowing presses the constant-resistance of ground tackle to make pressure load threshold value basic identical, and error range is no more than 5%.Certainly can be according to actual needs, adjust to allow and press the quantity of ground tackle, be generally 1～9, in same anchor cable, allowing in inner anchoring carrying bodies at different levels presses the ground tackle quantity can be identical, also can be different.
Allow and press ground tackle 200 for moving the device that produces constant resistance at drag-line 202 to drag-line in loaded plate motion process.As shown in Figure 7, allow press ground tackle 200 by allow gland cylinder 201, allow the constant-resistance body 203 of gland cylinder 201 inside and a drag-line 202 that vertically runs through loaded plate 100 form, drag-line 202 by end anchor 204 be fixedly connected with constant-resistance body.
As shown in Figure 7, capsule 300 is laminated structure, allow and press gland cylinder 201 two ends that allow of ground tackle 200 be sealed and matched with pressure-bearing surface 101 and the capsule 300 of loaded plate 100 respectively, between capsule 220 and loaded plate 100, be fixedly connected with nut 401 by screw rod 400, will allow gland cylinder 200 clamp.Capsule 300 also can adopt seal closure structure, and the pressure-bearing surface 101 of it and loaded plate 100 is sealed and matched, and forms a seal chamber, and sealing cavity presses ground tackle to contain all allowing, and specifically can adopt the disclosed structure of CN101666093B.
As shown in Figure 7, constant-resistance body 203 is frustum structure, allows gland cylinder 201 comprise cavity segment 2011, changeover portion 2012 and the section of stopping 2013.Wherein changeover portion 2012 internal faces and constant-resistance body 203 match, and constant-resistance body 203 is fixedly connected with drag-line 202 by end anchor 204; In this structure, also can omit cavity segment, and capsule 300 adopts seal closure structure.For improving antiseptic property, allow the space in gland cylinder 201 or in seal closure can fill anticorrosion grease.
Constant-resistance body 203 and allow gland cylinder 201 also can adopt structure as disclosed in CN 102182182A, constant-resistance body 203 is the tapered cylindrical structure of head, head part stretches in the described section of stopping.In order to contribute to the moulding deformation of generation after extruding between constant-resistance body 203 and the section of stopping 2013, as shown in Figure 8, allow gland cylinder 201 internal faces have the convex tendon 2014 of axial setting, the spacing distance of convex tendon 2014 and number affects allow the constant-resistance of pressure ground tackle allow and press load threshold value, should arrange according to actual needs.
As shown in Figures 9 and 10, the present invention allows and presses the another kind of embodiment of ground tackle 200, allows and presses ground tackle to adopt slidably compression sleeve structure.Allow and press ground tackle 200 to be formed by two arc clips 206 in compression sleeve 205 and compression sleeve, arc clip 206 arranges around drag-line 202, and internal face is exasperate structure, allow pressure ground tackle push arc clip 206 by compression sleeve 205 and clamp drag-line 202, realization is relative fixing with drag-line.
As shown in figure 10, the pressure-bearing surface 101 on compression sleeve 205 one end and loaded plate 100 pastes and touches, and in the time that drag-line 202 exceedes pre-constant load, while exceeding the frictional force between arc clip 206 and drag-line 202, drag-line 202 produces slippage.For preventing the drag-line 202 slippage excess of stroke, at drag-line 202 end fixed end anchors 208.
As shown in Figure 9, the present embodiment capsule 300 is laminated structure, each allows presses ground tackle 200 overcoats to have pillar 207, pillar 207 entangles end anchor 208 and compression sleeve 205, two ends are sealed and matched with pressure-bearing surface 101 and the capsule 300 of loaded plate 100 respectively, and be connected with nut by screw rod equally between loaded plate 100 and capsule 300, pillar 207 is clamped fastening.In this structure, also can omit pillar 207, capsule 300 adopts aforesaid seal closure structure, and for improving antiseptic property, anticorrosion grease is filled in the space in pillar 207 or in seal closure.
As shown in Figure 7, drag-line 202 outer cover are provided with plastic bushing 2021, and plastic bushing 2021 can be PVC, PE pipe etc., between it and drag-line 202, is filled with anticorrosion grease, jointly drag-line 202 is protected, can allow in addition relative plastic bushing 2021 slippages of drag-line 202.Drag-line 202 also can adopt structure as shown in figure 11; its main part is composited by carbon fiber and glass fiber; outside is provided with separation layer 2022; barrier coating adopts heated bitumen/geotextiles integument or plastic pipe; separation layer shields on the one hand; on the other hand by drag-line and the isolation of injecting cement paste layer, drag-line slippage relatively.
As shown in Figure 1, the inner anchoring carrying body of previous stage is longer than the guy cable length in the inner anchoring carrying body of rear one-level, and therefore the guy cable length in first order inner anchoring carrying body is the longest, but drag-line equal in length in inner anchoring carrying body at the same level.In inner anchoring carrying bodies at different levels, allow and press the quantity of ground tackle can be identical, also can be different, the present embodiment adopts two-stage inner anchoring carrying body, and in each inner anchoring carrying body, allowing and pressing ground tackle quantity is 3.Spacing between adjacent inner anchoring carrying body is generally 1.5～12m, and being applied in its spacing in hard rock is 3m left and right, is 5～12m and be applied in middle soft rock and soil layer.In multistage inner anchoring carrying body, the spacing of adjacent inner anchoring carrying body can be identical, also can be different.
As shown in Figure 2-5, loaded plate 100 is roughly equilateral triangle, on every limit, has depression, and this depression is mainly used in the location of drag-line in the multistage inner anchoring carrying body before it.As shown in Figure 1, the present embodiment allows presses anchor cable to have two-stage inner anchoring carrying body, is respectively inner anchoring carrying body 10a, 10b.Three drag-line 202a on inner anchoring carrying body 10a coordinate with the depression 102b on inner anchoring carrying body 10b, thereby realize location.Loaded plate 100a, 100b shape are identical, coaxially arrange, but punch position are staggered, and drag-line 202a, 202b be the total six roots of sensation always, on their same circumference taking anchoring carrying body axle center as the center of circle, is uniformly distributed, stressed more even.By that analogy, if inner anchoring carrying body, more than 2 grades, is similarly coaxial setting, but the perforation of drag-line on each loaded plate is interspersed, and final all drag-lines are uniformly distributed on same circumference.
Loaded plate can change to some extent because of the difference shape of drag-line quantity in every grade of anchoring carrying body of inner anchoring carrying body sum of series, as shown in Figure 12～14, allowing press in anchor cable has more than 3 grades inner anchoring carrying body, and loaded plate shown in figure is to allow presses in anchor cable the shape of loaded plate in afterbody inner anchoring carrying body.
As shown in figure 12, have 6 drag-lines 902 in front what inner anchoring carrying body, correspondingly loaded plate 900 outer peripheral faces have 6 depressions to coordinate with drag-line 902, also have 3 drag-lines 901 through loaded plate 900, and finally this anchor cable has 9 drag-lines.As shown in figure 13, have 8 drag-lines 1002 in front what inner anchoring carrying body, corresponding loaded plate 1000 outer peripheral faces have 8 depressions to coordinate with drag-line 1002, also have 4 drag-lines 10001 through loaded plate 1000, and final anchor cable has 12 drag-lines.As shown in figure 14, in front what inner anchoring carrying body, there are 18 drag-lines 1102 (omitting wherein several), corresponding loaded plate 1100 outer peripheral faces have 18 depressions to coordinate with drag-line 1102, have 6 drag-lines 110 (omitting wherein several) 1 through loaded plate 1100.When more drag-lines, so analogize.
Can draw the following conclusions from above-described embodiment: the loaded plate outer peripheral face of m level inner anchoring carrying body has the depression coordinating one by one with all drag-lines 1st～m-1 level inner anchoring carrying body, if the loaded plate periphery of the 1st grade of inner anchoring carrying body can be not cave in, the depression that the loaded plate periphery of second level inner anchoring carrying body has with in the first order, the upper drag-line of anchoring carrying coordinates one by one, by that analogy.This depression can position drag-line, prevents that multiple drag-lines tangle together.
As shown in Figure 1, apparatus of the present invention also comprise conventional installation, location, slip casting, tensioning fixation and protection assembly.Comprise the aperture concrete pedestal 31 in drag-line centering in anchor hole 50 or locating support 21 (only showing a place in figure), outer anchor section 30, reinforcement ring 32, aperture oviduct 35, anchor plate 33, the outer anchor head 34 in the pedestal concrete of aperture, bracing cable clamp 37, outer anchor head protective cover 36 and Grouting Pipe 60.The techniques such as pore-creating, installation, slip casting and the prestressed stretch-draw of apparatus of the present invention anchor cable routinely technology are carried out.
In the middle of an overall anchor cable, the every pulling force difference to some extent that drag-line bears, as all drag-lines allow pressure ground tackle be connected with one, the pulling force that drag-line bears has likely exceeded the threshold limit value that can bear, but not exceeding to allow, the pulling force that all anchor cables bear presses the constant-resistance of ground tackle allow to press load threshold value, there is not slippage in constant-resistance body, now easily causes drag-line to be pulled off.
Adopt the structure described in the present embodiment, allow pressure ground tackle because single cable connects one, and each allowing presses ground tackle to have close constant-resistance to allow and press load threshold value.Allow pulling force that single cable is born exceed to allow and press the constant-resistance of ground tackle allow to press load threshold value, there is slippage in the relative loaded plate 100 of drag-line, can avoid being pulled off, and the free segment of anchor cable can not extend.Only have the pulling force bearing when all drag-lines exceed allow corresponding with it and press the constant-resistance of ground tackle allow to press load threshold value, free segment just extends, and therefore has the large deformation of reply and anti-seismic performance.When being less than corresponding allowing, drag-line institute bearing tension wherein presses the constant-resistance of ground tackle allow to press load threshold value, free segment to stop extending.
As shown in Figure 15～16, they are respectively traditional pressure dispersing anchorage cable technical schemes such as () one as disclosed in CN201258485Y " Novel pressure dispersion prestress anchorage cable ", CN101666092A disclosed " the interior anchor supporting body of pressure dispersing anchorage cable " and the pulling force-deformation behaviour curve curve of the present embodiment pressure dispersing anchorage cable in the time of non-prestressed work and prestressing force work.Wherein, F represents anchor cable load pulling force; δ represents the tension deformation values of anchor cable; F
bfor anchor cable ultimate bearing capacity; F
rpress bearing capacity threshold values for allowing for anchor cable; F
tfor anchor cable prestress value.
C1, Ct1 are traditional anchor cable pulling force deformation behaviour curve under non-prestressed work and prestressing force condition of work respectively, because the ground tackle of interior anchor supporting body can not produce constant force slippage, its pulling force deformation behaviour curve is the physico mechanical characteristic of drag-line material itself, and total deformation value is very little;
R1, Rt1 are apparatus of the present invention pulling force-deformation behaviour curves under non-prestressed work and prestressing force condition of work respectively, press ground tackle because of allowing of interior anchor supporting body and there is constant-resistance deformation characteristic, therefore its pulling force deformation behaviour curve is to allow press the slip value of ground tackle and the physico mechanical characteristic of drag-line material itself synthetic, total deformation value mainly depends on and allows the slippage size of pressure ground tackle.
Anchor cable maximum allows presses slippage LR to represent elongation or the anchor cable elongated constant resistance and large deformation performance of whole anchor cable after work.In theory, anchor cable maximum allows presses slippage LR and allows the maximum of pressure ground tackle 200 allow pressure slippage Lra equate, but in actual conditions, due to reasons such as reservoir stress, has certain difference.
Claims (4)
1. a pressure dispersing type allows pressure anchor cable, comprise interior anchor section (10), free segment (20) and outer anchor section (30), described interior anchor section (10) comprises n level inner anchoring carrying body, n is not less than 2 integer, it is characterized in that, described inner anchoring carrying body comprises that loaded plate (100), capsule (300) and between the two at least two allow and presses ground tackle (200), and each allowing presses ground tackle to be connected with a drag-line (202) that passes loaded plate (100);
The loaded plate outer peripheral face of m level inner anchoring carrying body is provided with the depression for locating all drag-lines of 1st～m-1 level inner anchoring carrying body, and m is integer, and 2≤m≤n;
Described allowing presses ground tackle (200) to comprise at least two arc clips around drag-line (202) (206) in compression sleeve (205) and compression sleeve (205), described arc clip (206) internal face is exasperate structure, and it clamps drag-line (202) by the extruding of compression sleeve (205);
Described allowing presses ground tackle overcoat to have one section of pillar (207), and described capsule (300) is laminated structure, and pillar (207) two ends are sealed and matched with loaded plate (100) and capsule (300) respectively.
2. pressure dispersing type according to claim 1 allows pressure anchor cable, it is characterized in that, in single-stage inner anchoring carrying body, allows and presses ground tackle (200) to be uniformly distributed on the circumference taking loaded plate center as the center of circle.
3. pressure dispersing type according to claim 1 allows pressure anchor cable, it is characterized in that, described drag-line (202) outer cover is provided with plastic bushing, between plastic bushing (2021) and drag-line (202), is filled with anticorrosion grease.
4. pressure dispersing type according to claim 1 allows pressure anchor cable, it is characterized in that, described drag-line (202) is composited by carbon fiber and glass fiber, and outside is provided with separation layer (2022).
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| CN201210116464.XA CN102619226B (en) | 2012-04-19 | 2012-04-19 | Pressure dispersion type yielding anchor cable |
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|---|---|---|---|
| CN201210116464.XA CN102619226B (en) | 2012-04-19 | 2012-04-19 | Pressure dispersion type yielding anchor cable |
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| CN102619226B true CN102619226B (en) | 2014-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103362124A (en) * | 2013-07-17 | 2013-10-23 | 重庆岩安科技有限公司 | Recoverable anchor cable for civil engineering |
| CN103758551B (en) * | 2014-01-22 | 2017-01-04 | 山东科技大学 | Multistage anchoring type resin anchor and anchoring process thereof |
| CN104373145B (en) * | 2014-11-04 | 2016-08-17 | 中国矿业大学 | Embedded classification constant-resistance shearing resistance large deformation anchor and method |
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| CN102619226A (en) | 2012-08-01 |
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Denomination of invention: A pressure dispersive yielding anchor cable Effective date of registration: 20210609 Granted publication date: 20141105 Pledgee: Bank of Hangzhou Limited by Share Ltd. science and Technology Branch Pledgor: HANGZHOU DODRIVE ENGINEERING MATERIALS Co.,Ltd. Registration number: Y2021330000531 |