CN108385679A - Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass - Google Patents
Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass Download PDFInfo
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- CN108385679A CN108385679A CN201810555410.0A CN201810555410A CN108385679A CN 108385679 A CN108385679 A CN 108385679A CN 201810555410 A CN201810555410 A CN 201810555410A CN 108385679 A CN108385679 A CN 108385679A
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- reinforcing steel
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- isolating joint
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- 239000011435 rock Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title description 17
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 82
- 239000000463 material Substances 0.000 claims abstract description 75
- 238000010276 construction Methods 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 66
- 239000010959 steel Substances 0.000 claims description 66
- 239000011440 grout Substances 0.000 claims description 49
- 230000000694 effects Effects 0.000 claims description 28
- 238000004873 anchoring Methods 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 210000003205 muscle Anatomy 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000008267 milk Substances 0.000 claims description 5
- 210000004080 milk Anatomy 0.000 claims description 5
- 235000013336 milk Nutrition 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 238000013517 stratification Methods 0.000 abstract description 25
- 238000007711 solidification Methods 0.000 abstract description 13
- 230000008023 solidification Effects 0.000 abstract description 13
- 230000002787 reinforcement Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 229920000965 Duroplast Polymers 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
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- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
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- 241000397426 Centroberyx lineatus Species 0.000 description 2
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- 230000002452 interceptive effect Effects 0.000 description 2
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- 239000003351 stiffener Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of tension type prestressed anchors and construction method for reinforcing soft rock class beded rock mass, including bolthole, presstressed reinforcing steel, presstressed reinforcing steel is located at hole inside points and is divided into grouted part and free segment with interior anchorage from the inside to surface, bolthole where the grouted part of the presstressed reinforcing steel is up big and down small inverted conical hole, and grouting material is full of between presstressed reinforcing steel and interior anchorage and the hole wall in inverted conical hole；The height in the inverted conical hole of grouted part is 350~500mm；The height of free segment presstressed reinforcing steel is 1~4m；Aperture where the free segment of the presstressed reinforcing steel is 55~65mm；The device for thering is one can be radially expanded in inverted conical hole on the isolating joint to position isolating joint.Bond-anchorage strength height between grouting material and hole wall, its simple in structure, material-saving, easy for construction, work progress after grouted part presstressed reinforcing steel of the present invention and solidification are small to rock mass stratification vibratility and suitable for preventing Rock along the environment of stratiform generation rock fall disaster.
Description
Technical field
The present invention relates to rock protection field of engineering technology, are especially a kind of tension type for reinforcing soft rock class beded rock mass
Prestressed anchor and method.
Background technology
It is partial layer in the rock mass of 8~30cm thickness compared with thickness such as thickness in being as thin as in soft rock class beded rock mass especially stratiform
Landwaste shale mulling interlayer is much accompanied between reason and has crack, this kind of rock mass fracture growth, it would be possible to avalanche and landslide occur
Equal geological disasters.
Landslide Hazards occur in order to prevent, need to carry out consolidation process, the most frequently used also easier structure and method are
Using tension type reinforcement with prestressed anchor device.Its processing method is usually, first between rock mass reinforcing region is by design requirement
Away from, deep drilling, borehole cleaning places presstressed reinforcing steel such as steel strand wires, installation casing, stretch-draw anchor extremity piece, grout pipe etc., wherein being in the milk
Pipe is also referred to as Grouting Pipe, is then in the milk and conserves, last tensioned prestressing bar simultaneously anchors.Referring to Fig. 1, the tension type of the prior art is pre-
Stress bolt anchorage device is generally by being arranged in straight-tube shape bolthole 102, the presstressed reinforcing steel with interior anchorage 103 for being reinforced rock mass
104, bearing plate 105, tensioning section and outer anchorage 106, grouted part bellows 107 and isolating joint 108 and free segment set
It is constituted after pipe 109 and the solidification of grout pipe 110 and grouting material 101, wherein grouting material is also referred to as grout material or injection slurry.Prestressing force
Muscle and interior anchorage are passed to by bond-anchorage effect between the grouting material and hole wall after solidification is reinforced rock mass.In order to ensure have
Enough bearing capacities, grouted part must have enough length, and 5 meters are no less than as.It is free segment below anchoring section, it is described
Free segment refers to being acted on without grouting material i.e. soap-free emulsion polymeization between presstressed reinforcing steel such as steel strand wires and hole wall.The freedom length of presstressed reinforcing steel
After passing through potential slip layer, the length stretched out cannot be less than 1.5 meters, that is, freedom length is generally no less than 5 meters, hole
Interior presstressed reinforcing steel total length is generally 10 meters or close to 10 meter, and the length ratio of the presstressed reinforcing steel of grouted part and free segment is generally
1:1.Practice have shown that the anchor pole of the above prior art is preventing from generating to the potential slip-crack surface of ground on rear side of side slope or supporting excavation
Landslide caused by there is preferable technique effect in terms of Rock And Soil overall collapse.But it is thick as every in being to be as thin as in horizontal rock stratum
In the rock mass that layer rock thickness is 8~30cm, especially when rock cave hole, top soft rock class beded rock mass surface weathering is more serious and easy
When there is the geological disaster that rock generates avalanche along stratiform, using the tension type reinforcement with prestressed anchor device of the above prior art
And method is handled, and but there is following technical problem：1, the structure of the anchoring section of the above prior art and the straight tube shape in hole make
Adhesive property is undesirable between grouting material and hole wall after presstressed reinforcing steel and solidification, and anchoring strength is not high.2, viscous for anchoring section
The needs of power and anchoring strength are tied, the anchoring depth of the above prior art is longer, and filling process is also inevitable to stratification infiltration
, so, when solidification shrinkage will generate stratification new loosening, the reinforcing to avalanche type geological disaster to grouting material between stratification
It is particularly disadvantageous.3, since above-mentioned anchoring depth is longer, pressure is said and is relatively concentrated relatively between making rock mass stratification, to local stiffening
Effect produces negative effect.4, for the needs of anchoring section cohesive force and anchoring strength, the bore diameter of the above prior art
Generally between 110~150mm, Construction practices show that vibrations when bore operation can generate stratification loosening trend, and drilling is straight
Diameter is bigger, and this vibration influence is bigger, and the possibility that stratification loosens in operation process is bigger, to reinforcing or even construction operation
Safety negative effect also can be bigger.5, there are one fail to solve always the tension type prestressed anchor of the above prior art
The technical issues of：The isolating joint of grouted part and free segment relies on duroplasts grout pipe such as PVC grout pipes and positions, isolating joint
The positioning of edge and hole wall and sealing effect are undesirable always, meanwhile, if want to extract out duroplasts grout pipe can only grouting material not
It takes out before solidification, is stayed on partition board after the positioning and sealing and the extraction of duroplasts grout pipe at the edge and hole wall of isolating joint
The closure problem of hole can not just solve, but if duroplasts grout pipe is not extracted out and is stayed in bolthole, Construction practices but table
Bright, which is difficult to avoid generating interference to the presstressed reinforcing steel and free segment casing of free segment, pre- to affect
The mechanical property of the stretch-draw effect and presstressed reinforcing steel free segment of stress rib free segment.
Invention content
The invention solves a technical problem be to provide a kind of grouted part presstressed reinforcing steel and the grouting material after solidification
And it is bond-anchorage strength height between hole wall, its simple in structure, material-saving, easy for construction and suitable for preventing Rock along stratiform
Generate the tension type prestressed anchor of the reinforcing soft rock class beded rock mass of rock fall disaster.
The technical solution of the present invention is to provide a kind of tension type prestressed anchor for reinforcing soft rock class beded rock mass
Bar, including bolthole, presstressed reinforcing steel, presstressed reinforcing steel are located at hole inside points and are divided into the grouted part with interior anchorage and oneself from the inside to surface
By section, presstressed reinforcing steel stretch out hole outside is divided into tensioning and outer anchoring section, have between grouted part and free segment it is circular be isolated connect
Head, presstressed reinforcing steel pass through isolating joint；There are outer anchor, presstressed reinforcing steel to pass through outer anchor in tensioning and outer anchoring section,
The grout pipe of the bolthole and grouting equipment of connection grouted part is through on outer anchor and isolating joint；The prestressing force
Bolthole where the grouted part of muscle is up big and down small inverted conical hole, the presstressed reinforcing steel and interior anchorage and inverted cone
Grouting material is full of between the hole wall in shape hole.
After using the above structure, anchor pole of the present invention has the following advantages：Anchor pole of the present invention is readily applicable to prevent soft rock class layer
Shape Rock generates in rock fall disaster environment along stratiform and plays reinforcement effect：Due to where the grouted part of presstressed reinforcing steel
Bolthole uses up big and down small inverted cone, and the grouting material solidify in addition after is directly viscous with presstressed reinforcing steel and interior anchorage and hole wall
Knot so that transmit the bond-anchorage effect that power is not only grouting material between presstressed reinforcing steel and interior anchorage and hole wall, that is, palisades, also fall
The wedging action of cone, that is, mechanical snap power, so, bond-anchorage strength greatly improves, and its is simple in structure, easy for construction,
The material for saving presstressed reinforcing steel and grouting material, reduces cost.Also, the length i.e. height of grouted part can be effectively reduced,
Reduce grouting material between stratification solidification shrinkage and probability and the negative effect of new loosening are generated to stratification, make to press between stratification
Power is evenly dispersed, is conducive to the reinforcement technique effect for preventing soft rock class beded rock mass rock from generating avalanche along stratiform.In addition, due to
Inverted cone bond-anchorage strength is high, and bore diameter can significantly reduce, and Construction practices show to become smaller due to aperture, construction
The possibility that stratification loosens in the process generates the influence loosened not with regard to small, and in grouted part reaming to free segment rock stratification
Greatly, so, using the above structure after, be greatly reduced in work progress drilling free segment rock stratification is generated loosen it is negative
It influences.
Preferably, the height in the inverted conical hole of the grouted part is 350~500mm；The grouted part prestressing force
The total height of muscle and interior anchorage is equal to or less than the height in inverted conical hole.After using the above structure, in the altitude range, reduce
Grouting material between stratification solidification shrinkage and to generate the new effect for loosening probability and negative effect to stratification more preferable, make between stratification
The evenly dispersed technique effect of pressure is more preferable.
Further, the height of the free segment presstressed reinforcing steel is 1~4m.After using the above structure, the layer of the free segment
Shape rock can get the compressive pre-stress compared with Direct Uniform, and since the total length of the anchor pole is shortened dramatically than the prior art, add
On eliminate and the bellows of grouted part and the casing of free segment can be saved, not only saved material but also kept structure simpler, operated more
It is convenient.
Further, the aperture where the free segment of the presstressed reinforcing steel is 55~65mm.After using the above structure, aperture
Within the scope of this, the consolidation effect of normal construction and anchor pole not only can guarantee, but also reduce drilling pair in work progress as far as possible
Free segment rock stratification generates the negative effect loosened.
Further, the grout pipe is pvc pipe, has axial limit structure on the grout pipe of the isolating joint bottom surface；
The device for thering is one can be radially expanded in inverted conical hole on the isolating joint to position isolating joint；The isolation connects
There is a pair of hermatic door that there is guide frame and be used for the hole after closure grouting pipe is taken away on head, every piece of hermatic door is far from grouting
There is the compression spring for being pressed against two sealed sides in the side of pipe.After using the above structure, the edge of isolating joint had both been satisfactorily resolved
The closure problem that the hole on isolating joint is stayed in after positioning and sealing and the extraction of plastics grout pipe with hole wall, in turn avoids
PVC grout pipes stay in the presstressed reinforcing steel in hole to free segment and generate interference, and the tensioning effect of presstressed reinforcing steel free segment has been effectively ensured
The mechanical property of fruit and presstressed reinforcing steel free segment.
Further, the isolating joint includes circular upper plate and circular lower plate, and a flange collar is fixed in lower plate,
An annular elastomeric is fixed on upper plate and lower plate, annular elastomeric is located on the outside of flange collar, has on annular elastomeric excircle more
Root is radially supported when annular elastomeric is pressurized to the card column of inverted conical hole wall, after the High definition annular elastomeric compression of flange collar
Height；Upper plate and the outer diameter of lower plate are equal to or less than the apertures where the free segment of presstressed reinforcing steel；Annular elastomeric is not pressed
The plumb line of all card column outer ends is each fallen in the plumb line of upper plate excircle configuration under contracting state.Isolating joint can be in inverted conical
It is radially expanded in hole to which the device that position isolating joint is using after the above concrete structure, when grouting material compressing annular elastomeric
Make to position when card column card to inverted conical hole wall with free segment straight hole wall junction, it is simple in structure, it positions and leakproofness
It can be reliable.
Further, the presstressed reinforcing steel is steel strand wires, and grouted part steel strand wires will be fixed on by having on the isolating joint
The interior anchorage at top is supported on to the supporting rod extremely or close at bolthole roof and of material is easily broken made.Using the above knot
After structure, grouted part that can be by bending without straight steel strand wires is sent to precalculated position, ensure that the convenience of installation, and because of branch
Strut is easily to break material such as bamboo cane or batten to make, and can instantaneously be broken in tension steel strand, so not interfering with steel
The mechanical property of twisted wire stretch-draw effect and steel strand wires.
Further, the flexible sealing strip of the sealed sides of the hermatic door；The top and outside of the hermatic door prevent
The protective cover that grouting material enters.After using the above structure, when PVC grout pipes clog isolating joint, grouting material will not enter sealing
The shutoff operation of hermatic door is not interfered in the structure of door, and hermatic door is closed while the extraction of PVC grout pipes, is at this moment filled
The mobility of slurry is little, when hermatic door is turned off and after flexible sealing strip seals, even if accidentally having grouting material to fall above
Enter, nor affects on next step tensioning and anchoring and the mechanical property of presstressed reinforcing steel.
Further, the grouting material is straight screw sleeve connection grouting material.Construction practices show using the grouting
Material can further increase after grouting material solidification with the adhesion strength of interior anchorage and presstressed reinforcing steel and hole wall.
Further, the outer anchor includes the boxlike bearing plate of hollow cylindrical, and boxlike bearing plate includes cover board
And bottom plate, cover board and bottom plate faying face are that planing holds out against face, cover board and bottom edge have multiple vertical steel strand wires for protection network and
The horizontal steel strand wires of protection network radially across arc-shaped through-hole, cover board and bottom edge have multiple radial limited blocks.Using the above knot
After structure, the bearing plate of outer anchorage can also serve as the support of the vertical steel strand wires of hole top surface protection network and the horizontal steel strand wires of protection network
Point, dual-use material both save material, reduce cost, and reduce construction procedure, improve construction efficiency.
The invention solves another technical problem be to provide a kind of grouted part presstressed reinforcing steel and the grouting after solidification
Bond-anchorage strength between material and hole wall is high, construction when, material-saving small to rock mass stratification disturbing influence, easy for construction and be suitable for
Prevent soft rock class beded rock mass rock from generating the pulling force for reinforcing soft rock class beded rock mass in rock fall disaster environment along stratiform
The construction method of type prestressed anchor.
Another technical solution of the present invention is to provide a kind of tension type of above-mentioned reinforcing soft rock class beded rock mass
The construction method of prestressed anchor, includes the following steps：
The straight hole of a diameter of 55~65mm is drilled out with boring bar tool, the height of straight hole is 1350~4500mm；
Up big and down small inverted conical hole where expanding the anchoring section of presstressed reinforcing steel with inverted conical reaming tool.
After above step, the method for the present invention has the following advantages：Anchor rod construction method of the present invention is readily applicable to prevent
Soft rock class beded rock mass rock generates in rock fall disaster environment along stratiform and plays reinforcement effect：Due to the interior anchoring of presstressed reinforcing steel
Section bolthole use up big and down small inverted conical hole, in addition solidify after grouting material directly with presstressed reinforcing steel and interior anchorage and
Hole wall bonds so that the bond-anchorage effect that power is not only grouting material is transmitted between presstressed reinforcing steel and interior anchorage and hole wall, that is, palisades,
The also wedging action of inverted cone body, that is, mechanical snap power, so, bond-anchorage strength greatly improves, and its is simple in structure,
Material that is easy for construction, saving presstressed reinforcing steel and grouting material, reduces cost.Also, the length of grouted part can be effectively reduced
Degree is height, that is, reduce grouting material between stratification solidification shrinkage and probability and the negative effect of new loosening are generated to stratification,
Pressure is evenly dispersed between making stratification, is conducive to the reinforcement technique effect for preventing soft rock class beded rock mass rock from generating avalanche along stratiform
Fruit.In addition, since inverted cone body bond-anchorage strength is high, bore diameter can significantly reduce, Construction practices show due to
Aperture becomes smaller, and the possibility that stratification loosens in work progress generates free segment rock stratification with regard to small, and in grouted part reaming
The influence of loosening is little, so, after above step, drastically reduces in work progress and drill to free segment rock stratification
Generate the negative effect loosened.
Further, the method for the present invention is further comprising the steps of：
Borehole cleaning；
The dress that can radially expand to position isolating joint in inverted conical hole will be carried after prefabricated and assembling
Position limiting structure of the isolating joint set through PVC grout pipes is supported in inverted conical hole, at the same on isolating joint with easily breaking material
Expect that the interior anchorage being fixed at the top of grouted part steel strand wires is supported on to extremely or close at bolthole roof by the supporting rod made；
The sealed sides of hermatic door are pushed against in PVC grouting pipe outer walls by compression spring at this time；
The fixed outer anchor on the outer wall of anchor pole aperture：The steel strand wires for reserving tensioning section, by prefabricated boxlike pressure-bearing
After plate passes through steel strand wires and PVC grout pipes, boxlike bearing plate is fixed on the palisades outside bolthole；
Straight screw sleeve connection grouting material is perfused into inverted conical hole through grout pipe using pressure grouting device, reaches pre-
Fixed grouting fills remaining rate and stops grouting, while extracting PVC grout pipes out, and the sealed sides of hermatic door are under the elastic force effect of compression spring at this time
Mutually push against the holes blocking after extracting the grout pipe of isolating joint out；Meanwhile the pressure of grouting material makes to determine on isolating joint
Isolating joint is stuck in the inverted conical hole with straight hole junction by the device of position；
After grouting material reaches predetermined setting time, easy pressure is broken simultaneously through tensioning equipment tensioned prestressing bar such as steel strand wires
The supporting rod of disconnected material making simultaneously anchors outer anchoring section intermediate plate anchorage.
After above step, the method for the present invention has further the advantage that：Both satisfactorily resolved the edge of isolating joint with
The closure problem that the hole on isolating joint is stayed in after the positioning of hole wall and sealing and the extraction of PVC grout pipes, in turn avoids PVC
Grout pipe stays in hole the presstressed reinforcing steel to free segment and generates interference, be effectively ensured presstressed reinforcing steel free segment stretch-draw effect and
The mechanical property of prestressing force free segment.Bending can be sent without the grouted part of straight steel strand wires to precalculated position, is protected simultaneously
The convenience of installation is demonstrate,proved, and because supporting rod is easily to break material such as bamboo cane or batten to make, it is instantaneous in tension steel strand
It can break, so not interfering with the stretch-draw effect of steel strand wires and the mechanical property of steel strand wires.In addition, when PVC grout pipes clog
When grouting material will not enter in the structure of hermatic door and not interfere with the shutoff operation of hermatic door, and when the extraction of PVC grout pipes together
When hermatic door close, at this moment the mobility of grouting material is little, when hermatic door is turned off and after flexible sealing strip seals, even if
Accidentally there is grouting material to fall into above, nor affects on next step tensioning and anchoring and the mechanical property of presstressed reinforcing steel.In addition, anchor rod
The bearing plate of outer anchorage can also serve as the supporting point of the vertical steel strand wires of hole top surface protection network and the horizontal steel strand wires of protection network, and one
Object is dual-purpose, both saves material, reduces cost, and reduce construction procedure, improves construction efficiency.
Description of the drawings
Fig. 1 is the positive schematic cross-sectional view of prior art anchor pole.
Fig. 2 is the positive schematic cross-sectional view of anchor pole of the present invention.
Fig. 3 is positive schematic cross-sectional view when a kind of specific implementation mode of isolating joint in the present invention is uncompressed.
Fig. 4 is positive schematic cross-sectional view when a kind of specific implementation mode of isolating joint in the present invention is compressed.
Fig. 5 is the A-A sectional structure enlarged diagrams in flange collar in Fig. 3.
The elevational schematic view of protection network in Fig. 6 present invention.
Fig. 7 is the positive schematic cross-sectional view of the boxlike bearing plate in the present invention.
Fig. 8 is that (presstressed reinforcing steel and filling is not shown in the schematic cross-sectional view of facing upward of the cover board of the boxlike bearing plate in the present invention
Slurry pipe).
Fig. 9 is the locking device of the steel strand wires in length and breadth side schematic cross-sectional view in the present invention.
Figure 10 is the positive schematic cross-sectional view of the locking device of steel strand wires in length and breadth in the present invention.
Figure 11 is the head cover present invention looks up structural representation in the locking device of steel strand wires in length and breadth in the present invention.
As shown in the figure 1, presstressed reinforcing steel, 2, bolthole, 3, grouted part, 4, grouting material, 5, interior anchorage, 6, inverted conical
Hole, 7, isolating joint, 8, free segment, 9, grout pipe, 10, tensioning and outer anchoring section, 11, flange collar, 12, annular elastomeric, 13, card
Column, 14, supporting rod, 15, upper plate, 16, lower plate, 17, axial limit structure, 18, flexible sealing strip, 19, compression spring, 20, hermatic door,
21, boxlike bearing plate, 22, the horizontal steel strand wires of protection network, 23, the vertical steel strand wires of protection network, 24, cover board, 25, bottom plate, 26, radial
Limited block, 27, crosspoint, 28, pillar, 29, arc-shaped through-hole, 30, U-shaped bolt, 31, nut, 32, gland, 33, outer anchorage,
34, protective cover, 35, through-hole.
Specific implementation mode
The specific implementation mode of the present invention is described further below in conjunction with the accompanying drawings.Herein it is to be understood that, for
The explanation of these embodiments is used to help understand the present invention, but does not constitute limitation of the invention.In addition, disclosed below
The present invention each embodiment in involved technical characteristic and technological means as long as they do not conflict with each other can
To be combined with each other.
The present invention is applied to reinforce soft rock class beded rock mass, and soft rock is specification saying, also has soft rock in industry and compared with soft rock
Call, it will be appreciated that be also included in soft rock this major class compared with soft rock.
As shown in Fig. 2, the present invention reinforces the tension type prestressed anchor of soft rock class beded rock mass, including bolthole 2, answer in advance
Power muscle 1, presstressed reinforcing steel 1 are located at hole inside points and are divided into grouted part 3 and free segment 8 with interior anchorage 5, presstressed reinforcing steel from the inside to surface
It is divided into tensioning and outer anchoring section 10 outside 1 stretching hole.There is circular isolating joint 7 between grouted part 3 and free segment 8, answers in advance
Power muscle 1 passes through isolating joint 7.According to common knowledge it is found that the centre bore of presstressed reinforcing steel 1 and isolating joint 7 is clearance fit,
That is presstressed reinforcing steel 1 can move axially in 7 centre bore of isolating joint for tensioning, and the top of 7 centre bore of isolating joint
General flexible sealing ring prevents grouting material 4 from flowing into, certainly, accidentally a small amount of to flow into the tensioning effect that influence presstressed reinforcing steel 1
Fruit and mechanical property.There are outer anchor, presstressed reinforcing steel 1 to pass through outer anchor in tensioning and outer anchoring section 10, it can be appreciated that
Presstressed reinforcing steel 1 and the centre bore of outer anchor such as bearing plate are clearance fit, i.e. presstressed reinforcing steel 1 can be in bearing plate centre bore
Axial movement is for tensioning.The bolthole 2 that connection grouted part 3 is through on outer anchor and isolating joint 7 is set with grouting
Standby grout pipe 9.The tensioning section is outermost end portion, and those skilled in the art understand that tensioning equipment is independent tool,
It needs that tensioning equipment is fastened and is resisted against on the bearing plate of outer anchor with presstressed reinforcing steel 1 when tensioning to carry out presstressed reinforcing steel 1
Predetermined pull is stretched to be anchored with outer anchorage 33.Presstressed reinforcing steel 1 has using reinforcing bar, but present embodiment is preferably steel
Twisted wire, such as use a steel strand wires, tensile strength standard value 1860N/mm2, nominal diameter 15.2mm, nominal section
Product is 140mm.The interior anchorage 5 is Extrusion anchor ground tackle, and outer anchorage 33 is intermediate plate anchorage.
As shown in Fig. 2, the bolthole 2 where the grouted part 3 of the presstressed reinforcing steel 1 is up big and down small inverted conical hole
6, grouting material 4 is full of between the presstressed reinforcing steel 1 and interior anchorage 5 and the hole wall in inverted conical hole 6.It can be appreciated that bolthole 2
The cylinder-shaped hole in inverted conical hole 6 and free end 8 including grouted part.Grouting material 4 is also referred to as grout material, injection slurry, after solidification
Grouting material also have title grouting body or injecting cement paste.Bar connecting sleeve grouting material can be used in grouting material 4.Grouted part anchor 3 is pre-
The total height of stress rib 1 and interior anchorage 5 is equal to or less than the height in inverted conical hole 6.The height of 8 presstressed reinforcing steel 1 of the free segment
Degree is preferably 1~4m, such as 3 meters.The cone line in inverted conical hole 6 and the angle of plumb line are preferably 5~10 °, such as 5 °.It is described pre- to answer
Aperture where the free segment 8 of power muscle 1 is preferably 55~65mm, such as 60 millimeters.The free segment 8 refers to the presstressed reinforcing steel 1 of this section
Without grouting material between hole wall, i.e., non-binding acts between presstressed reinforcing steel 1 and hole wall.Present embodiment free segment 8 it is pre-
Outside stress rib 1 can not casing also belong to the scope of the present invention equipped with casing certainly.
As shown in Figure 3, Figure 4, the grout pipe 9 is pvc pipe, also referred to as hard plastic tube.The PVC of 7 bottom surface of the isolating joint
Pipe is to have axial limit structure 17 on grout pipe 9, and the step being located at as illustrated in the drawing on excircle, or fixation are such as adhesive in outside
Multiple axial limiting blocks on circumference.There is one can be radially expanded in inverted conical hole 6 on the isolating joint 7 to be isolated
Connect the device of 7 positioning：
As shown in Figure 3, Figure 4, such as：The isolating joint 7 includes circular upper plate 15 and circular lower plate 16, lower plate 16
Upper fixation is such as welded with a flange collar 11, is fixed on upper plate 15 and lower plate 16 and is such as adhesive with an annular elastomeric 12 such as rubber ring, very
To being sponge ring, annular elastomeric 12 is located at 11 outside of flange collar, has more to work as annular elastomeric on 12 excircle of annular elastomeric
12 radially support when being pressurized to the card column 13 of the hole wall in inverted conical hole 6, after the compression of High definition annular elastomeric 12 of flange collar 11
Height.Upper plate 15 and the outer diameter of lower plate 16 are equal to or less than the aperture where the free segment 8 of presstressed reinforcing steel 1 so that isolation connects
First 7 pass through this section of bolthole 2.The plumb line of 13 outer end of all card columns is each fallen under 12 uncompressed state of annular elastomeric
In the plumb line of 15 excircle configuration of plate, in other words, the outer diameter of annular elastomeric 12 is less than when uncompressed including card column 13
Or the outer diameter equal to upper plate 15, again smaller than or equal to lower plate 16 outer diameter, with ensure to be equipped under uncompressed state this positioning dress
The isolating joint 7 set can pass through the bolthole 2 of free segment 8.When inserting pvc pipe to grouted part 3, limited in the axial direction of pvc pipe
Under the promotion of bit architecture 17, isolating joint 7 enters the inverted conical hole 6 with the junction in 8 hole of free segment by 8 hole of free segment
It is interior, annular elastomeric 12 is flattened after grouting material 4 generates pressure to the upper plate 15 of isolating joint 7, until upper plate 15 is supported to convex
Enclose 11 top surfaces, and under the radial position-limiting action of flange collar 11, annular elastomeric 12 can only extend to 6 wall of inverted conical hole and with
The card column 13 being fixed on periphery wall is stuck on 6 wall of inverted conical hole with the junction in 8 hole of free segment to position, while lower plate
The grouting material prevented in inverted conical hole is acted between 6 wall of 16 excircle and the excircle of annular elastomeric 12 and inverted conical hole
4 flow into the sealing function of i.e. this section bolthole 2 in 8 hole of free segment.
For another example：The isolating joint includes circular upper plate and circular lower plate, and fixed in lower plate to be such as welded with one convex
It encloses, fixed on upper plate and lower plate to be such as adhesive with an annular air-pocket, annular air-pocket inflation rate is maintained at 50% or so, annular air-pocket position
On the outside of flange collar, there is polylith radially to be supported when annular air-pocket is pressurized to the fixture block of back taper hole wall on annular air-pocket excircle, it is convex
Height after the High definition annular air-pocket compression of circle.Upper plate and the outer diameter of lower plate be equal to or less than presstressed reinforcing steel free segment
The aperture at place, the plumb line of all fixture block outer ends each falls within the plumb line of upper plate excircle configuration under annular air-pocket uncompressed state
It is interior, so that isolating joint passes through the sector hole.In other words, the outer diameter of annular elastomeric is small when uncompressed including card column
In or equal to upper plate outer diameter, again smaller than or equal to lower plate outer diameter, to ensure to be equipped with this positioning device under uncompressed state
Isolating joint can pass through free sector hole.When inserting PVC grout pipes to grouted part, the axial limiting on PVC grout pipes
Under the promotion of structure, isolating joint by free sector hole enter in the inverted conical hole of the junction of free sector hole.Work as grouting
Annular air-pocket is flattened after expecting the upper plate generation pressure to isolating joint, until upper plate is supported to flange collar top surface, and in the diameter of flange collar
To under position-limiting action, arc air bag can only extend to inverted conical hole wall and is stuck in and oneself with the fixture block being fixed on periphery wall
By on the inverted conical hole wall of sector hole junction with positioning, while the excircle of the excircle of lower plate and annular air-pocket and hole wall it
Between act the sealing function for preventing the grouting material in inverted conical hole from flowing into free sector hole.
For another example：There is a round radial groove on the isolating joint excircle, polylith arc is circumferentially equipped in groove
Fixture block such as welds or is bolted at least one compression spring on every piece of arc fixture block, under compression spring compressive state with fixed on groove inner wall
Length add the thickness of arc block to be equal to or less than the depth of groove, the outer diameter of isolating joint be equal to or less than presstressed reinforcing steel from
As the aperture where section, so that isolating joint can pass through free sector hole.When inserting PVC grout pipes to grouted part, filled in PVC
Under the promotion for starching the axial limit structure of pipe, when isolating joint is entered by free sector hole in inverted conical hole, do not have freely
Constraint of the sector hole wall to polylith arc fixture block, under the force of a spring polylith arc fixture block to inverted conical hole wall extend and
It is positioned on the inverted conical hole wall of the junction of free sector hole, while the excircle of the isolating joint of round radial groove lower part
The sealing function for preventing the grouting material in inverted conical hole from flowing into free sector hole is acted with inverted conical hole wall.
As shown in figure 5, after having a pair that there is guide frame on the isolating joint 7 and being taken away for closure grouting pipe 9
There are the compression spring 19 for being pressed against two sealed sides in the hermatic door 20 of hole, side of each hermatic door 20 far from grout pipe 9.Upper
In the embodiment for stating the isolating joint 7 for setting upper plate 15, lower plate 16 and flange collar 11, hermatic door 20 is located at 7 lower plate 16 of isolating joint
Top surface, respective compression spring 19 are fixed on hermatic door 20 and flange collar 11.Presstressed reinforcing steel 1 and grout pipe 9 both pass through lower plate 16 and upper
Plate 15.The top and outside of the hermatic door 20 have the protective cover for preventing grouting material 4 from entering to can be understood as upper plate 15 and ring
What shape elastomer 12 or annular air-pocket were constituted.In the embodiment of the above-mentioned isolating joint for setting round radial groove, hermatic door is set
In the top surface of isolating joint, respective compression spring is fixed on hermatic door and is fixed on the respective convex block in isolating joint top surface.It is described
There are the protective cover for preventing grouting material from entering in the top and outside of hermatic door.It is described in the embodiment of three above-mentioned isolating joints
The sealed sides of hermatic door can set flexible sealing strip 18.Guide frame can be that hermatic door bottom sets swallow-tail form sliding block, and isolation connects
Crown face or the top surface of above-mentioned lower plate set the dovetail slideway with swallow-tail form sliding block sliding fit.
It is to be set with above-mentioned on the above-mentioned isolating joint for setting round radial groove referring to Fig. 3, Fig. 4, on the isolating joint
On the isolating joint 7 of plate, lower plate and flange collar, equipped with being supported on the interior anchorage 5 being fixed at the top of 3 steel strand wires of grouted part to extremely
Or the supporting rod 14 made close at bolthole 2 i.e. 6 roof of inverted conical hole and of material such as bamboo bar or rod is easily broken, it is such as interior
There is a blind hole on anchorage 5, the bottom end of bamboo bar or rod is plugged in the blind hole.Certainly, there is blind hole that can manage in this way on isolating joint
Solution：Through-hole is set on upper plate 15, lower plate 16 is non-porous, and the two, which combines, can regard a blind hole as.
As shown in Figure 7, Figure 8, it is mainly used in view of anchor pole of the present invention and loosens stratification weathering from soft rock class bedded rock
And in the geological disaster environment of avalanche, can take into account while carrying out bolt anchorage to do not set anchor pole rock cave hole push up its
His surface adds steel strand wires protection network.So the present invention can take into account simultaneously when designing the bearing plate of outer anchor
The vertical steel strand wires 23 of steel strand wires protection network and 22 point action of horizontal steel strand wires of protection network.The outer anchor includes above-mentioned
The boxlike bearing plate 21 of intermediate plate anchorage and hollow cylindrical.Boxlike bearing plate 21 includes cover board 24 and bottom plate 25, cover board 24 and bottom
25 faying face of plate is that planing holds out against face, and cover board 24 has multiple vertical steel strand wires 23 for protection network and horizontal steel strand wires with 25 edge of bottom plate
22 radially across arc-shaped through-hole 29, can specifically be set on 24 edge of cover board more such as four pillars 28 circumferentially arranged or
Ribbed stiffener, constitute between adjacent struts 28 for protection network vertical steel strand wires 23 and protection network horizontal steel strand wires 22 by arc it is logical
Hole 29.The outside of pillar 28 is all provided with one piece of radial limited block 26, and extends downwardly the bottom surface of cover board 24, and the radial limit of bottom plate 25 exists
In four pieces of radial limited blocks 26.The cover board 24 is that planing holds out against face with 25 faying face of bottom plate, and concrete structure is as follows：Cover board 24
Four pillars and 25 faying face of bottom plate the plane mutually held out against is finished out through planer, claim the face to planish in industry and hold out against
The transmission of power is completed with this in face, that is, after tensioning is anchored to such as steel strand wires application prestressing force of presstressed reinforcing steel 1 and with intermediate plate anchorage,
Pressure transmission is that ribbed stiffener passes to cover board 24 to rock mass by pillar 28 to bottom plate 25 by the anchorage.Planing is held out against in face
Planing is held out against for transmitting pressure, it is desirable that contact surface is smooth, therefore requires upper planer that component contact surface is planished in technique.Row
The recognized standard in the industry：Planing：The flatness 0.3mm of surface planing；Surface planing is not more than 1/1500 to the verticality of axis；Planing
The surface roughness 0.03mm in face.It holds out against：Contact surface is not less than 75%, with the clearance gauge inspection of 0.3mm, fills in the sum of area and is less than
25%；Edge maximal clearance is less than 0.8mm.
As shown in Fig. 6, Fig. 9, Figure 10, Figure 11, the vertical steel strand wires 23 of protection network and about the 22 horizontal steel strand wires of protection network are wrong
Position ground passes through the arc-shaped through-hole 29 of boxlike bearing plate 21 and can substantially be in that horizontal direction moves, and waits for that protection network indulges steel strand wires 23 and protection
After the horizontal steel strand wires 22 of net tense, in the vertical steel strand wires 23 and protection network of protection network in addition to 21 crosspoint of boxlike bearing plate
It is locked with locking device on the crosspoint 27 of horizontal steel strand wires 22.The locking device is such as：Each U-shaped bolt 30 in left and right is embraced
It is firmly passed through after the horizontal steel strand wires 22 of protection network after the gland 32 of totally four through-holes 35 for the vertical steel strand wires 23 for covering protection network with four
A nut 31 screws.
Referring to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11
The construction method of the tension type prestressed anchor of the above-mentioned reinforcing soft rock class beded rock mass of the present invention is as follows：
1, by the pitch-row of design requirement bore position is marked in reinforcing area.
2, the straight hole i.e. bolthole 2 of free segment 8 that diameter is preferably such as 60 millimeters of 55~65mm is drilled out with boring bar tool, directly
Hole it is highly preferred be 1350~4500mm such as；3350 millimeters.
3, the up big and down small inverted conical hole 6 where expanding the grouted part 3 of presstressed reinforcing steel 1 with back taper reaming tool
That is the bolthole 2 of this section such as expands height topmost at up big and down small inverted conical hole 6, plumb line for 350 millimeters of straight hole
Angle with circular cone line is 5 °~10 ° such as 5 °；Inverted conical reaming tool be the prior art, such as diameter of ream bit be less than or
In free segment aperture, when entering the position for wanting reaming, the inverted conical cutter of reaming is gradually unfolded and is expanded to being pre-designed
Inverted conical hole size complete reaming, then by cutter purse up to diameter of ream bit be less than or equal to 8 aperture of free segment again
Outside exit aperture.
4, with the blower borehole cleaning of Electric blower.
5, the dress that can radially expand to position isolating joint in inverted conical hole will be carried after prefabricated and assembling
The isolating joint 7 set is supported through 9 axial limit structure 17 of PVC grout pipes in inverted conical hole 6, meanwhile, according to setting spring
The specific implementation mode of isolating joint, then make through acting force of the spring the device of the positioning on isolating joint by isolating joint be stuck in
Making of easily breaking material where presstressed reinforcing steel free segment in the inverted conical hole of straight hole junction, while on isolating joint 7
Supporting rod 14 the interior anchorage 5 for being fixed at the top of 3 steel strand wires of grouted part is supported on to or close to bolthole 2 i.e. inverted cone
At 6 roof of shape hole；The sealed sides of hermatic door 20 are pushed against on 9 outer wall of grout pipe through compression spring 19 at this time.
6, the fixed outer anchor on the outer wall of anchor pole aperture：The steel strand wires for reserving tensioning section hold prefabricated boxlike
After pressing plate 21 passes through steel strand wires and PVC grout pipes 9, boxlike bearing plate 21 and steel strand wires are fixed on outside bolthole, applied as utilized
Work holder is fixed temporarily the steel strand wires of boxlike bearing plate 21 and tensioning section.
7, straight screw sleeve connection grouting material is perfused into inverted conical hole through grout pipe 9 using pressure grouting device, reached
Slurry rate also known as is filled to rate more than preliminary filling, such as scheduled 0.1 cube of grouting material stops grouting, while extracting PVC plastic grout pipe 9 out,
The sealed sides of hermatic door 20 mutually push against the hole after extracting the grout pipe 9 of isolating joint 7 out under the elastic force of compression spring 19 at this time
It blocks, meanwhile, according to the specific implementation mode for the isolating joint for setting annular elastomeric or annular air-pocket, then the pressure after being in the milk
Make the device of the positioning on isolating joint that isolating joint 7 to be stuck in the rounding with 1 free segment of presstressed reinforcing steel, 8 place straight hole junction
In bellmouth 6.
8, it after grouting material reaches predetermined setting time, is broken simultaneously through such as steel strand wires of tensioning equipment tensioned prestressing bar 1
Easily break the supporting rod 14 of material making and after reaching tensioning predetermined stress by outer anchoring section outer anchorage 33 such as intermediate plate anchorage
Anchoring.Control stress for prestressing can use σcon=0.55fptk, f in formulaptkFormula is the standard value of prestress wire tensile strength.
9, multiple boxlike bearing plates 21 are passed through to be formed the horizontal steel strand wires 22 of the vertical steel strand wires 23 of protection network and protection network
Protection network tensioning is tight, and the horizontal steel strand wires 22 of the vertical steel strand wires 23 of the protection network other than boxlike bearing plate 21 and protection network intersect
Crosspoint 27 is locked with locking device on point 27.
10, the extra steel strand wires other than outer anchorage 33 are cut off, and the protective cover 34 of outer anchorage is installed.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.It is all within spirit of that invention and principle, made by it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of tension type prestressed anchor for reinforcing soft rock class beded rock mass, including bolthole (2), presstressed reinforcing steel (1), are answered in advance
Power muscle (1) is located at hole inside points and is divided into grouted part (3) and free segment (8) with interior anchorage from the inside to surface, and presstressed reinforcing steel (1) is stretched
Outside of portalling is divided into tensioning and outer anchoring section (10), there is circular isolating joint (7) between grouted part (3) and free segment (8),
Presstressed reinforcing steel (1) passes through isolating joint (7)；There are outer anchor, presstressed reinforcing steel (1) to pass through outer in tensioning and outer anchoring section (10)
The bolthole (2) and grouting equipment of connection grouted part (3) are through on anchor, outer anchor and isolating joint (7)
Grout pipe (9), it is characterised in that：Bolthole (2) where the grouted part (3) of the presstressed reinforcing steel (1) is up big and down small
Inverted conical hole (6), between the presstressed reinforcing steel (1) and interior anchorage (5) and the hole wall of inverted conical hole (6) full of grouting
Expect (4).
2. the tension type prestressed anchor according to claim 1 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
The height in the inverted conical hole of grouted part (3) is 350~500mm；Grouted part (3) presstressed reinforcing steel (1) and interior anchorage
(5) total height is equal to or less than the height of inverted conical hole (6).
3. the tension type prestressed anchor according to claim 2 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
The height of free segment (8) presstressed reinforcing steel (1) is 1~4m.
4. the tension type prestressed anchor according to claim 1 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
Grout pipe (9) is pvc pipe, has axial limit structure (17) on the grout pipe (9) of isolating joint (7) bottom surface；The isolation
The device for thering is one can be radially expanded in inverted conical hole on connector (7) to position isolating joint (7)；The isolating joint
(7) there are a pair of hermatic door (20) that there is guide frame and be used for the hole after closure grouting pipe (9) is taken away, every piece of hermatic door on
(20) there is the compression spring (19) for being pressed against two sealed sides in the side far from grout pipe (9).
5. the tension type prestressed anchor according to claim 4 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
Isolating joint (7) include circular upper plate (15) and circular lower plate (16), a flange collar (11) is fixed in lower plate (16), on
An annular elastomeric (12) is fixed on plate (15) and lower plate (16), annular elastomeric (12) is located on the outside of flange collar (11), annular
There are more radially to be supported to the card column (13) of back taper hole wall when annular elastomeric (12) are pressurized on elastomer (12) excircle, it is convex
Enclose the height after High definition annular elastomeric (12) compression of (11)；Upper plate (15) and the outer diameter of lower plate (16) are equal to or small
The aperture where free segment (8) in presstressed reinforcing steel (1)；All card column (13) outer ends under annular elastomeric (12) uncompressed state
Plumb line each fall in the plumb line of upper plate (15) excircle configuration.
6. the tension type prestressed anchor according to claim 4 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
Presstressed reinforcing steel (1) is steel strand wires, and the interior anchorage at the top of grouted part (3) steel strand wires will be fixed on by having on the isolating joint (7)
(5) it is supported on to the supporting rod (14) extremely or close at bolthole (2) roof and of material is easily broken made.
7. the tension type prestressed anchor according to claim 5 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
The flexible sealing strip of sealed sides (18) of hermatic door (20)；The top and outside of the hermatic door (20) prevent grouting material (4)
The protective cover of entrance.
8. the tension type prestressed anchor according to claim 1 for reinforcing soft rock class beded rock mass, it is characterised in that：It is described
Outer anchor includes the boxlike bearing plate (21) of hollow cylindrical, and boxlike bearing plate (21) includes cover board (24) and bottom plate
(25), cover board (24) is that planing holds out against face with bottom plate (25) faying face, and cover board (24) has multiple for protection with bottom plate (25) edge
The vertical steel strand wires (23) of net and the horizontal steel strand wires (22) of protection network radially across arc-shaped through-hole (29), cover board (24) and bottom plate
(25) there is polylith radial direction limited block (26) at edge.
9. the tension type prestressed anchor of the reinforcing soft rock class beded rock mass described in a kind of any one of claim 1~8
Construction method, it is characterised in that：Include the following steps：
The straight hole of a diameter of 55~65mm is drilled out with boring bar tool, the height of straight hole is 1350~4500mm；
Up big and down small inverted conical hole where expanding the grouted part (3) of presstressed reinforcing steel (1) with inverted conical reaming tool
(6)。
10. a kind of construction method of the tension type prestressed anchor of the reinforcing soft rock class beded rock mass described in claim 9, special
Sign is：It is further comprising the steps of：
Borehole cleaning；
By it is prefabricated and after assembling with can be radially expanded in inverted conical hole to the device that positions isolating joint every
It is supported in inverted conical hole (6) from axial limit structure (17) of the connector (7) through PVC grout pipes (9), while isolating joint (7)
On will be fixed on interior anchorage (5) at the top of grouted part (3) steel strand wires with the supporting rod (14) for easily breaking material making and support
To extremely or close at bolthole (2) roof；The sealed sides of hermatic door (20) are pushed against PVC grout pipes by compression spring (19) at this time
(9) on outer wall；
The fixed outer anchor on the outer wall of anchor pole aperture：The steel strand wires for reserving tensioning section, by prefabricated boxlike bearing plate
(21) after passing through steel strand wires and PVC grout pipes (9), boxlike bearing plate (21) is fixed on the palisades outside bolthole；
Straight screw sleeve connection grouting material is perfused into inverted conical hole (6) through PVC grout pipes (9) using pressure grouting device,
Reach scheduled to fill remaining rate and stop being in the milk, while extracting PVC grout pipes (9) out, the sealed sides of hermatic door (20) are in compression spring at this time
(19) the holes blocking after lower PVC grout pipes (9) extraction mutually pushed against isolating joint (7) of elastic force effect；Meanwhile it being in the milk
The pressure of material (4) makes the device of the positioning on isolating joint (7) that isolating joint (7) to be stuck in the inverted conical with straight hole junction
In hole (6)；
After grouting material (4) reaches predetermined setting time, is broken simultaneously through tensioning equipment tension steel strand and easily break material making
Supporting rod (14) and by outer anchoring section with intermediate plate anchorage anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810555410.0A CN108385679A (en) | 2018-06-01 | 2018-06-01 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810555410.0A CN108385679A (en) | 2018-06-01 | 2018-06-01 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
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| Publication Number | Publication Date |
|---|---|
| CN108385679A true CN108385679A (en) | 2018-08-10 |
Family
ID=63071644
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810555410.0A Pending CN108385679A (en) | 2018-06-01 | 2018-06-01 | Reinforce the tension type prestressed anchor and method of soft rock class beded rock mass |
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| CN (1) | CN108385679A (en) |
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| CN114592510B (en) * | 2022-03-11 | 2024-02-20 | 深圳市工勘岩土集团有限公司 | Construction method for elastic partition of free section and anchoring section |
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| CN114561941A (en) * | 2022-03-13 | 2022-05-31 | 深圳市工勘岩土集团有限公司 | Prestressed anchor rod anchoring structure for free section post grouting |
| CN114561943B (en) * | 2022-03-13 | 2024-06-14 | 深圳市工勘岩土集团有限公司 | Construction method for anchoring prestressed anchor rod body by grouting after free section |
| CN114561941B (en) * | 2022-03-13 | 2024-06-14 | 深圳市工勘岩土集团有限公司 | Prestressed anchor rod anchoring structure for grouting after free section |
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