CN1122745C - Pull-pressure dispersed protecting anchor cable and its construction method - Google Patents
Pull-pressure dispersed protecting anchor cable and its construction method Download PDFInfo
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- CN1122745C CN1122745C CN 98109189 CN98109189A CN1122745C CN 1122745 C CN1122745 C CN 1122745C CN 98109189 CN98109189 CN 98109189 CN 98109189 A CN98109189 A CN 98109189A CN 1122745 C CN1122745 C CN 1122745C
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- steel strand
- anchor cable
- loaded plate
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Abstract
The press invention relates to a pull-pressure dispersed protective anchor cable and a construction method thereof. The anchor cable is composed of an outer anchor head, a free section and an anchoring section; two or more bearing bodies are distributed on the anchoring section, wherein each bearing body is composed of a non-adhesion steel strand, a bearing plate, an elastic gasket and a squeezing sheath, and the bearing plate, the elastic gasket and the squeezing sheath are sequentially sheathed on the non-adhesion steel strand; the number of the steel strands which pass through the bearing plates is different, and a part which exceeds the bearing plate at the end of each steel strand is stripped to be an adhesive steel strand. The construction method comprises the construction steps of hole drilling, manufacture and arrangement of the anchor cable, slurry injection, tensioning and locking, etc. The anchoring of the present invention has the advantages of uniform stress distribution and good anchoring and corrosion prevention effect; the anchor cable has the advantages of simple structure and convenient construction.
Description
Technical field
The present invention relates to a kind of ground anchorage with anchor cable and construction.
Background technology
In geotechnical anchor engineering, adopt tension type earth anchor construction at present, widely used is pulling force concentrated anchor cable more, because slurry tensile strength is low, during stretch-draw, slurry tensile stress occurs and concentrates at the interface on anchoring section, under the excessive action of pulling stress, crackle can appear in the injecting paste material of this part, thereby makes slurry lose antiseptic effect to anchor cable, along with stretching force increases, progressive failure appears easily, and then the slurry tensile failure, and progressively move down, entirely ineffective until anchoring.
Begin a small amount of pressure concentrated anchor cable and construction that adopts now, utilized the high advantage of slurry compressive strength rate tensile strength, but the problem that anchoring body also exists stress to concentrate.
More than two types of anchor cables owing to all exist stress too to concentrate and skewness, easily cause the ruined problem of slurry, thereby can not play permanent protection and shorten the purpose of anchor cable length.
Japan is a kind of pressure dispersing type anchoring construction method and the pressure dispersing anchorage cable of development recently, though the problem that counter stress is concentrated has some improvement, and ideal, and complex structure not enough, cost height.
Summary of the invention
The objective of the invention is to concentrate the advantage of tension type and pressure dispersing anchorage cable construction, provide a kind of and make that stress distribution is more even, the transmission of power more is tending towards rationally, anchor cable structure simply, the pull-pressure dispersed protecting anchor cable and the construction of favorable anti-corrosion effect, easy construction.
For reaching above-mentioned purpose, the technical scheme of the present invention's pull-pressure dispersed protecting anchor cable is: this anchor cable comprises outer anchor head, free section, anchoring section three parts, outer anchor head is by intermediate plate, anchor slab, backing plate constitutes, in being with on the non-bending steel cable of anchoring section, outer support frame, there is guiding cap on the top of its longest steel strand, be distributed with two or more supporting bodies on the described anchoring section, each supporting body is by non-bending steel cable and be enclosed within loaded plate on the non-bending steel cable successively, extruded sleeve, elastomeric pad is formed, be drilled with through hole and an injected hole of equating with the required number that passes steel strand on each loaded plate, for pressure is disperseed, the non-bending steel cable number that passes each loaded plate does not wait, and the end of every non-bending steel cable exceeds loaded plate and partly peels off to the bonding steel strand are arranged.
Pull-pressure dispersed protecting anchor cable construction main processes is as follows:
(1) pore-creating:
(2) make, anchor cable is installed: calculate anchor cable steel strand length by drilling depth and structure chart, the PE layer is removed in every steel strand termination, form bonding section that 1-2m grows, the longest two isometric steel strand are passed the first floor loaded plate of inner end, load onto elastomeric pad, on steel strand, put extruded sleeve near elastomeric pad, admittedly lock with vertically-displacable extruder extruding extruded sleeve, second layer loaded plate is enclosed within on the longest two steel strand again, penetrate second two long isometric steel strand at second layer loaded plate, load onto the solid lock of elastomeric pad and extruded sleeve and extruding, the loaded plate of the required number of plies according to said method is installed successively again, the solid lock of elastomeric pad and extruded sleeve and extruding, form a plurality of supporting bodies, spacing 1-2m between per two adjacent loaded plates, guiding cap is installed on top at the anchor cable longest steel strand, in installing along the every 1-3m spacing of anchor cable body then, outer support frame passes whole anchor cable body with Grouting Pipe at last from the centre;
(3) slip casting: slip casting adopts grouting pump to carry out, and guarantees the slip casting mouth of pipe all the time below the slurries face, and the hollow bulb of each supporting body fills up cement paste;
(4) stretch-draw, locking: the stretching construction operation adopt segmentation, in batches, symmetrical simultaneous tension, two steel strand of the inner end of pretensioning supporting body, the stretch-draw second layer, the 3rd layer and each layer supporting body steel strand successively according to the order of sequence again.
Because adopt said structure, the present invention's pull-pressure dispersed protecting anchor cable and pull-pressure dispersed protecting anchor cable construction have the following advantages:
1, stress distribution is more even, anchoring effect is better;
As previously mentioned, the present invention's pull-pressure dispersed protecting anchor cable has the stressed mechanism of tension and compression decentralized, this mechanism is by two or more supporting bodies and have the bond-anchorage section to produce, each supporting body is made up of loaded plate, elastomeric pad, extruded sleeve and steel strand. when applying stretching force with the jack pair non-bending steel cable, have the adhesive section steel strand to bear fractional load, the slurry tension; When load continues to increase, steel strand are passed to slurry with another part load with the form of compressive stress by extruded sleeve, elastomeric pad, loaded plate, last slurry acts on the soil body (rock mass) in the shear stress mode, by tensile stress and compressive stress load is disperseed like this and is evenly distributed on that (referring to Fig. 3) slurry is not destroyed in the anchoring body, anchoring effect is good.
2, guarantee the anchor cable life-span, be applicable to permanent protection.Because pressure disperses, slurry can not crack, favorable anti-corrosion effect, has adopted the non-bending steel cable that is with the polyethylene sleeve pipe again simultaneously, has formed multilayer proofing, has played the effect of permanent protection.
3, can shorten anchor cable length.Because stress distribution is even, has given full play to the geotechnical body supporting capacity, thereby can shorten anchor cable length, reduces cost.
4, adopt disposable full hole slip casting, simplified construction sequence, full hole slurry pressurized can be guaranteed anchored force when applying prestressing force.
5, apply prestressing force conveniently.Because adopt single hole anchor symmetry tensioning fixation, the pre-stress stretching device volume of use is little, in light weight, can construct under various conditions, especially is fit to use in the high gradient slope stabilization works.
6, same geological conditions can provide bigger anchored force down.
Description of drawings
Fig. 1 pull-pressure dispersed protecting anchor cable structural representation.
Fig. 2 pull-pressure dispersed protecting anchor cable construction process chart.
Fig. 3 pull-pressure dispersed protecting anchor cable stress distribution schematic diagram.
Stress distribution on Fig. 3-A anchoring body.
Fig. 3-B passes to the shearing stress distribution of the soil body.
The specific embodiment
Below, in conjunction with the accompanying drawings and embodiments, the architectural feature of the present invention's pull-pressure dispersed protecting anchor cable is further described.
Embodiment
A kind of pull-pressure dispersed protecting anchor cable and pull-pressure dispersed protecting anchor cable construction
As shown in Figure 1, the present invention's pull-pressure dispersed protecting anchor cable is by outer anchor head, anchoring section constitutes, outer anchor head is by intermediate plate 1, anchor slab 2, backing plate 3 constitutes, be with inner support frame 5 on the non-bending steel cable 4 of anchoring section, outer support frame 6, there is guiding cap 10 on the top of its longest steel strand, described anchoring section is distributed with two supporting bodies, each supporting body is by non-bending steel cable 4 and be enclosed within loaded plate 7 on the non-bending steel cable 4 successively, elastomeric pad 8, extruded sleeve 9 is formed, every non-bending steel cable 4 ends exceed loaded plate 7 parts peels off to the bonding steel strand are arranged, and promptly the end is divided into by loaded plate 7 has bonding and do not have bonding two parts.
The steel strand number that passes on each loaded plate does not wait, on the loaded plate of top at least 2, on the second layer loaded plate be 4, be drilled with hole and an injected hole of two steel strands on the first floor loaded plate, be drilled with hole and an injected hole of four steel strands on the second layer loaded plate, this anchor cable is furnished with Grouting Pipe 11.
Pull-pressure dispersed protecting anchor cable construction activities is as follows:
(1) preparation of construction;
(2) pore-creating: at stiff clay or in the stratum in the hole that is difficult for collapsing, can adopt the dry-type spiral boring method, in the stratum in the hole of easily collapsing, then will adopt the hole forming method of flush-type band protection casing, as run into rock, then use the Churn drill hole forming method;
(3) make, anchor cable is installed: calculate anchor cable steel strand length by drilling depth and structure chart, the PE layer is removed in every steel strand termination, form bonding section of 1-2m, the longest two isometric steel strand are passed the first floor loaded plate of inner end, load onto elastomeric pad, on steel strand, put extruded sleeve near elastomeric pad, admittedly lock with vertically-displacable extruder extruding extruded sleeve, second layer loaded plate is enclosed within on the longest two steel strand again, penetrate second two long isometric steel strand at second layer loaded plate, load onto the solid lock of elastomeric pad and extruded sleeve and extruding, spacing 1-2m between two adjacent loaded plates, guiding cap is installed on top at the anchor cable longest steel strand, in installing along the every 1-3m spacing of anchor cable body then, outer support frame passes whole anchor cable body with Grouting Pipe at last from the centre;
(4) slip casting: slip casting adopts grouting pump to carry out, and guarantees the slip casting mouth of pipe all the time below the slurries face, and the hollow bulb of each supporting body fills up cement paste;
(4) maintenance;
(6) prefabricated pier (building power transmission pier or beam and maintenance) is installed;
(7) stretch-draw, locking: the stretching construction operation adopt the segmentation of single hole anchor, in batches, symmetrical simultaneous tension, two steel strand of the inner end of pretensioning supporting body, the steel strand of stretch-draw second layer supporting body again.
(8) sealing off and covering anchorage.
The tensioning process parameter is as follows:
The first order: be stretched to 0.1Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.25Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.5Nt, be locked in 0.5Nt;
The second level: be stretched to 0.5Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.75Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.8Nt, be locked in 1.0Nt;
In the work progress, note the monitoring relevant data.
A kind of conversion as the embodiment of the invention, as required, described pull-pressure dispersed protecting anchor cable has the supporting body more than three or three, steel strand number on each loaded plate does not wait, on the loaded plate of top at least 2, increase progressively successively by 2 multiple from the top to outer anchor head, on the loaded plate of close outer anchor head on the number of steel strand and the outer anchor head number of steel strand consistent, be drilled with through hole and an injected hole of equating with the required number that passes steel strand on each loaded plate, be drilled with hole and an injected hole of two steel strands on the first floor loaded plate, be drilled with hole and an injected hole of four steel strands on the second layer loaded plate, the rest may be inferred.
Tension and compression disperse anchor cable construction worker method also to change accordingly, erection sequence is to install first earlier, second layer loaded plate, again the 3rd layer of loaded plate is enclosed within on the steel strand of the longest and second length, penetrate two of the 3rd length at the 3rd layer of loaded plate and follow isometric steel strand, load onto the solid lock of elastomeric pad and extruded sleeve and extruding, according to said method install the 4th successively again, the layer 5 loaded plate, the solid lock of elastomeric pad and extruded sleeve and extruding, form a plurality of supporting bodies, spacing 1-2m between per two adjacent loaded plates, guiding cap is installed on top at longest steel strand, in installing along the every 1-3m spacing of anchor cable body then, outer support frame.At last Grouting Pipe is passed whole anchor cable body from the centre; During stretch-draw, two steel strand of the inner end of pretensioning supporting body, the stretch-draw second layer, the 3rd layer, the 4th, layer 5, layer 6 supporting body steel strand successively according to the order of sequence again.
Claims (5)
1, a kind of pull-pressure dispersed protecting anchor cable, comprise outer anchor head, free section, Gu anchor section, outer anchor head is by intermediate plate (1), anchor slab (2), backing plate (3) constitutes, be with inner support frame (5) on the non-bending steel cable of anchoring section (4), outer support frame (6), there is guiding cap (10) on the top of longest steel strand, it is characterized in that: be distributed with two or more supporting bodies on the described anchoring section, each supporting body is by non-bending steel cable (4) and be enclosed within loaded plate (7) on the non-bending steel cable (4) successively, elastomeric pad (8), extruded sleeve (9) is formed, be drilled with through hole and an injected hole of equating with the required number that passes steel strand on each loaded plate, do not wait by the non-bending steel cable number on each loaded plate, every non-bending steel cable end exceeds loaded plate and partly peels off to the bonding steel strand are arranged.
2, pull-pressure dispersed protecting anchor cable as claimed in claim 1, it is characterized in that: the non-bending steel cable number on described each loaded plate does not wait, on the loaded plate of top at least 2, increase progressively successively by 2 multiple from the top to outer anchor head, the number of steel strand is consistent with steel strand number on the outer anchor head on the loaded plate of close outer anchor head.
3, a kind of pull-pressure dispersed protecting anchor cable construction, it is characterized in that: this construction comprises following activities:
(1) pore-creating:
(2) make, anchor cable is installed: calculate anchor cable steel strand length by drilling depth and structure chart, the PE layer is removed in every steel strand termination, form bonding section that 1-2m grows, the longest two isometric steel strand are passed the first floor loaded plate of inner end, load onto elastomeric pad, on steel strand, put extruded sleeve near elastomeric pad, admittedly lock with vertically-displacable extruder extruding extruded sleeve, second layer loaded plate is enclosed within on the longest two steel strand again, penetrate second two long isometric steel strand at second layer loaded plate, load onto the solid lock of elastomeric pad and extruded sleeve and extruding, again the 3rd layer of loaded plate is enclosed within on the steel strand of the longest and second length, penetrate the 3rd two long isometric steel strand at the 3rd layer of loaded plate, load onto the solid lock of elastomeric pad and extruded sleeve and extruding, the loaded plate of the required number of plies according to said method is installed successively again, the solid lock of elastomeric pad and extruded sleeve and extruding, form 2-6 supporting body, spacing 1-2m between per two adjacent loaded plates, guiding cap is installed on top at the anchor cable longest steel strand, in installing along the every 1-3m spacing of anchor cable body then, outer support frame passes whole anchor cable body with Grouting Pipe at last from the centre;
(3) slip casting: slip casting adopts grouting pump to carry out, and guarantees the slip casting mouth of pipe all the time below the slurries face, and the hollow bulb of each supporting body fills up cement paste;
(4) stretch-draw, locking: the stretching construction program adopts the segmentation of single hole anchor, symmetrical simultaneous tension in batches, two steel strand of the inner end of pretensioning supporting body, the stretch-draw second layer, the 3rd layer and each layer supporting body steel strand successively according to the order of sequence again.
4, pull-pressure dispersed protecting anchor cable construction as claimed in claim 3 is characterized in that: in stretch-draw, the locking working procedure, the tensioning process parameter is as follows:
The first order: be stretched to 0.1Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.25Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.5Nt, be locked in 0.5Nt;
The second level: be stretched to 0.5Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.75Nt, measure elongation, hold lotus 5min, measure elongation again, be stretched to 0.8 Nt, be locked in 1.0Nt;
5, as claim 3 or 4 described pull-pressure dispersed protecting anchor cable constructions, it is characterized in that: the supporting body of described pull-pressure dispersed protecting anchor cable is two, and the loaded plate of required installation, elastomeric pad and extruded sleeve are two-layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98109189 CN1122745C (en) | 1998-06-08 | 1998-06-08 | Pull-pressure dispersed protecting anchor cable and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98109189 CN1122745C (en) | 1998-06-08 | 1998-06-08 | Pull-pressure dispersed protecting anchor cable and its construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238411A CN1238411A (en) | 1999-12-15 |
| CN1122745C true CN1122745C (en) | 2003-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98109189 Expired - Lifetime CN1122745C (en) | 1998-06-08 | 1998-06-08 | Pull-pressure dispersed protecting anchor cable and its construction method |
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| CN (1) | CN1122745C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100398782C (en) * | 2002-12-16 | 2008-07-02 | 柳州欧维姆机械股份有限公司 | Vertical pipe vacuum pre pressing bidirectional slip casting method and sealed slip casting system thereof |
| CN1300417C (en) * | 2005-03-28 | 2007-02-14 | 李炳奇 | Permanent anchor rope used for side slope stabilization |
| CN101638893B (en) * | 2008-08-02 | 2012-08-15 | 柳州欧维姆机械股份有限公司 | Uniform pressure distribution type anchor cable |
| CN102943474B (en) * | 2012-11-23 | 2015-05-06 | 中冶建筑研究总院有限公司 | Insertion combination type recyclable expanding body anchor rod of high-bearing inner cabin and construction method |
| CN103061345A (en) * | 2013-02-01 | 2013-04-24 | 中铁二院工程集团有限责任公司 | Pressure dispersion-type anchorage cable crushing prevention grouting bearing plate structure |
| CN103758125B (en) * | 2014-01-21 | 2016-04-06 | 龚金京 | Extruding tapered end spring bearing plate stress dispersion type large-tonnage enlarged footing anchor cable |
| CN104314515A (en) * | 2014-10-23 | 2015-01-28 | 神华集团有限责任公司 | Method and device for sealing coal mine drilled hole |
| CN106065624B (en) * | 2016-07-12 | 2019-01-29 | 浙江交工集团股份有限公司 | Suitable for passing through the permanent seal cooling prestress anchorage cable and its construction method of broken rock |
| CN106917411B (en) * | 2017-03-16 | 2023-08-04 | 廖萍 | Pulling-pressing complementary type external anchoring locking anchor cable structure and construction method thereof |
| CN108360515A (en) * | 2018-04-27 | 2018-08-03 | 中国铁道科学研究院深圳研究设计院 | It is segmented reaming pressure anchor wire structure and construction method |
| CN111958809B (en) * | 2020-08-20 | 2022-04-08 | 凡天建筑科技有限公司 | Method for manufacturing precast pile rod |
-
1998
- 1998-06-08 CN CN 98109189 patent/CN1122745C/en not_active Expired - Lifetime
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| CN1238411A (en) | 1999-12-15 |
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Granted publication date: 20031001 |