CN1076760A - The closed grouting construction method of pretension rock anchor of facing upward - Google Patents
The closed grouting construction method of pretension rock anchor of facing upward Download PDFInfo
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- CN1076760A CN1076760A CN 92102173 CN92102173A CN1076760A CN 1076760 A CN1076760 A CN 1076760A CN 92102173 CN92102173 CN 92102173 CN 92102173 A CN92102173 A CN 92102173A CN 1076760 A CN1076760 A CN 1076760A
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- anchor
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Abstract
The closed grouting construction method of pretension rock anchor of facing upward in a kind of tunnel or the tube, be mainly installing pretension steel key after the anchor hole injection is finished, the steel key top is provided with activity reaming blade, blade opens the hook plug-in card and lives crag, pressure-bearing metal plate, gripping device and intermediate plate are installed then, are applied initial pretension steel key is stretched, irritate accelerating admixture in advance, near fixed sealing making in the pressure-bearing metal plate anchor hole, last cement grouting reaches makes pretension rock anchor purpose.
Description
The present invention relates to a kind of closed grouting construction method of pretension rock anchor of facing upward, this construction method mainly is included in steel key top installing activity reaming blade with the dogging crag, pressure-bearing metal plate, gripping device and intermediate plate are installed again, implement and just draw, the pre-accelerating admixture of irritating, after the fixed sealing, row grouting is again made pretension rock anchor to reach near making in the pressure-bearing metal plate anchor hole.
The general most injection of rock anchor draws that retaining wall, basement excavate continuous wall, the back of the body draws with the anti-floating earth anchor at the side slope back of the body etc., the former beats for bowing, the latter is injection vertically downward, so in operation since centrifugal force relation easily, but rock anchor for underground critical facility such as tube, tunnel and underground power plant engineering, except the aforementioned back of the body draws angle of depression formula injection earth anchor, must be to the vertical angle injection, but because gravitational influence, the work such as pretension steel key and grouting of installing are all very difficult, common difficulty has: (with 100 tons of rock anchor design pulling force, long 25 meters is example)
1. difficulty is installed: the steel key gross weight is * 0.78 kilogram=223 kilograms of 26 meters * 11 bundles, seven to eight people of these weight palpuses lift and push away, steel key could be advanced in the anchor hole, if the steel key head pushes up hole wall crack or shaggy block in the process that pushes at the bottom of the hole, then need ten several people could advance;
2. grouting difficulty: though there is the filling rubber pad to clog, the hole wall of hole is not a slyness, has met by chance concavo-convex or crack (shown in figure one), and cement paste still will spill;
3. anchoring force deficiency: (first half is hollow state because cement paste can't be full of fixed end; As shown in Figure 1), cause anchoring force not enough; Because centrifugal force makes the fixed end steel key rely on the work hole wall, cause cement paste and enclose Baogang's key (shown in figure two) unevenly in addition, cause anchoring force not enough;
4. steel key comes off: the steel key quality is big, often gets off because of the action of gravity landing.
In view of the above-mentioned defective of traditional elevation angle injection rock anchor, therefore, the object of the present invention is to provide a kind of closed grout construction method of pretension rock anchor of facing upward,
For implementing method of the present invention, utilize rig that steel key is pushed in the anchor hole, with spacing blade dogging crag so that the not reason action of gravity and dropping of rock anchor, simultaneously also with spacing blade dogging anchor hole wall so that the axis of steel key remain on the central axis of anchor hole, to reach the effect that cement paste encloses Baogang's key equably and strengthens anchorage, behind anchor hole mouth coating cement, promptly insert bearing plate, gripping device and intermediate plate, apply initial pretension so that steel key stretches, pour into accelerating admixture, fixed seal orifice makes grouting be difficult for leaking outside.
Now enumerate of the present invention one than specific embodiment, conjunction with figs. describes in detail so that can obtain clearly method of the present invention, implementation procedure, purpose and effect etc. to be understood.
The sectional drawing that Fig. 1 inserts the anchor hole mode for traditional steel key;
The sectional drawing that Fig. 2 inserts the anchor hole mode for traditional steel key;
Fig. 3 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 4 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 5 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 6 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 7 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 8 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
Fig. 9 is the closed grouting construction method of pretension rock anchor of facing upward of the present invention;
See also Fig. 1, be depicted as the schematic diagram of traditional last backstroke anchor body method for posting, this method is: after the injection of rock anchor was finished, personnel selection was tried hard to recommend and is lifted the steel key hand-hole, and the assembling of steel key comprises: head 5, steel key 2, encircle 3 greatly, little ring 4, the each several part space is formed, fixed end combines it with free end with envelope slurry device 8, and is inserted in polyethylene pipe 6, and the free end aperture is with 7 sealings of filling rubber pad, enclose placement pressure-bearing metal plate 10 at the polyethylene pipe outer shroud, withstand with metal plate bolster 101 again in case the steel key landing; Because when grouting, can not be very round or spill outside the hole because of the anchor hole mouth because of the slot that breaks often causes the water Buddhist nun to starch 9 streams, it is not enough to form grouting, causes the fixed end inanition, and it is bad with gripping anchorage effect to enclose bag.
Please, be depicted as the situation after backstroke anchor body is inserted traditionally, because of action of gravity referring again to Fig. 2, anchor body and steel key can't remain on the central axis of anchor hole, thus must deflection by touching in hole wall, cause grouting after, cement paste can not on average enclose Baogang's key, causes the anchoring force deficiency.
The present invention's construction method, then extremely shown in Figure 9 as Fig. 3.Please consult Fig. 3 earlier: utilization of the present invention comprises by a blade anchor head 13, folder key head 12, the rock anchor that steel key 2 is constituted, this rock anchor at the bottom of in conjunction with polyethylene matter grout pipe 21 and stack 22(shown in each profile among Fig. 7), its free end portion is inserted in this steel key 2 in the polyethylene pipe 15 after then being coated with rust preventive oil prior to steel key 2 again, two ends are with seccotine or adhesive plaster seal, after waiting to finish above-mentioned anchor body assembling, the rig head 16 of drilling rod 17 is clamped in operation again, drilling rod 17 pushing folder key heads 12 are upwards beaten and are made it to enter at the bottom of the hole, when if rubble stops the folder key head to advance, utilize the slight strike of head to enter, as shown in Figure 4, by rig 16 rotations, force blade 13 to open reaming and block (sticking in) hole wall during hand-hole.And look the stretching degree that nature of ground changes blade 13, as be hard rocks such as sandstone, metamorphic rock, slightly magnify blade 131 can hook; During as mud stone, shale alternating layers, can enlarge again.Its expansion or dwindle can be by following 3 confirmations:
1. hypothesis earth anchor design pulling force is 100 tons, and in the time of long 25 meters, steel key weight is 223 kilograms, adds that it is 250 kilograms that steel key changes the head lobe sheet, adds drilling rod again and has 500 kilograms.
2. confirm drag hook power: loosened by the rig head, steel key and drilling rod can be denied to slide voluntarily.
3. for safety, the rig head-clamp is lived drilling rod toward drop-down, and as spurring, promptly provable blade hooks crag.
4. please cooperate and consult Fig. 8, blade 13 and folder key head 12 the most weak parts are blade door bolt axle 134, and it is 10 millimeters that the present invention's door bolt axle adopts diameter, and when being subjected to pulling force, its shear stress is:
(a) material JIS standard SCM 4 cold finished steel bars are through heat treatment.
(b) tensile strength is 95～100 kilograms/square millimeter.
(c) shear strength is 76～80 kilograms/square millimeter.
Because blade door bolt 134 door bolt close anchor head blade 131, blade hooks crag, and stressed this formation on fulcrum of rear blade door bolt axle is subjected to shearing action
τ＝τ
a×a
＝76×（d
2π/4）＝76×100×3.1416/4
=5966 kilograms=6 tons
As Fig. 8,9: confirmation blade 131 open hook really after, promptly reverse drilling rod, break away from easy-releasing joint 129, reclaim drilling rod.
As Fig. 5, Fig. 6: after reclaiming drilling rod, stir a little cement paste or be coated in around the scar of aperture with powerful epoxy natural gum 26, the pulling force that insert the accelerating admixture intrusion pipe 19 made with polyethylene and stack 20, pressure-bearing metal plate 10, gripping device 24, intermediate plate 23 again, applies 200 kilograms of every approximately bundles in advance with single rifle drawing machine (not shown) makes steel key stretch locking.
As Fig. 6: after the locking, perfusion accelerating admixture 25, the accelerating admixture intrusion pipe of being made by polyethylene 19 pours into, air in the anchor hole is discharged by stack 20, when accelerating admixture is from stack 20 outflows by the time, promptly ends to pour into the gas that works of going forward side by side, by intrusion pipe 19 logical air inlet bodies, discharge from stack 20.When carrying out above-mentioned perfusion and exhaust, grout pipe 21 and the sealing temporarily of stack 22 pipes.After treating that epoxy natural gum is fixed, test encapsulating effect; Open rapid hardening intrusion pipe 19 aerations, if when pressure can't pour into greatly, promptly the accelerating admixture that pours into of proof has had the function of effective sealing.
As Fig. 7: after waiting to seal fixed finishing, get final product grout injection 9, cement paste is poured into by grout pipe 21, air is sealed temporarily by stack 22 discharge rapid hardening glue intrusion pipes 19 this moment and stack 20 in the anchor hole, when treating that cement paste 9 is flowed out by stack 22, prove that promptly slurries are about to fill in the anchor hole, this moment is with stack 22 sealings and plus-pressure grouting, pressure kept about 20 minutes, can make anchor hole be full of cement paste.
As Fig. 8,9: push the Kong Zhongzhi desired depth by rig 16 at drilling rod 17, with it rotation, make the rotation of drilling rod be delivered to easy-releasing joint 129, folder key head 12, center-pole 123, make pressure shoulder 139 force blade skew wall 132 and blade 131 is expanded and open with the skew wall principle, center-pole thread 138 more changes in the more retraction lower contact 1310, more down push away just more to force and press skew wall 132 in the shoulder conflict blade, and make it to open, and the blade tip of vane tip promptly cuts and cuts crag and reach the rotation reaming, till the blade stretching degree can be hooked crag.(cut and cut Shi Keyong air blowing or bath cooled blade) comprehensively concludes job practices of the present invention, and its construction sequence is:
1. rig is holed to desired depth.
2. assembling steel key: the blade anchor head is received the folder key head foremost, execute pretension on steel key (the bundle number of steel key is looked the pulling force tonnage and established), rise every 50～60 centimetres by fixed end and to establish a retainer ring, free end is coated with rust preventive oil earlier, be inserted in the polyethylene pipe, two ends are pinioned with powerful epoxy natural gum or adhesive plaster again.
3. with rig head-clamp drilling rod, drilling rod pushing folder key head hand-hole is to desired depth, if meet rubble when stoping into key, can enter with the slight strike of head.
4. the rotating head drilling rod forces the blade of key head upper end to open reaming, blocks crag.Look nature of ground again and determine the blade stretching degree, during as the hard rocks such as sandstone metamorphic rock of rock stratum, blade slightly opens and can hook; During or sand shale alternating layers that soft or hard differ bad as the loose cemented of mud stone, shale, the Pliocene Epoch～Pleistocene, then continue reaming, during to rig toward post-tensioning, till can't spurring, promptly the anchor head blade has blocked hole wall.
5. reversing drilling rod easy-releasing joint tooth is less because of skew wall degree difference, just can get loose easily and reclaims drilling rod.
6. at aperture side face coating cement, place pressure-bearing metal plate, gripping device and intermediate plate, execute every approximately fast 200 kilograms of pulling force with single rifle drawing machine, so that steel key stretches locking.
7. perfusion accelerating admixture (as with expansion fat, water glass etc.) seals the aperture.
8. when grout injection is to ororrhea set solid pore, closed grate hole plus-pressure grouting again, pressure kept about 20 minutes, made to be full of cement paste in the anchor hole.
To sum up state as can be known, characteristics of the present invention are to replace the manpower dress to key in the hole with mechanical force, so no matter anchor hole has by the angle of depression vertically downward, to vertical angle and upwards vertically all can operate, prestretching stretches steel key after dress is keyed in the hole, more can bring into play its pretension function, fill with in advance accelerator, fixed mud, and can force the underground water that underground stream is arranged leave with pressure, the water of formation pore is replaced the purpose that can reach pretension rock anchor by cement mortar.
In sum, the present invention can overcome the face upward deficiency of rock anchor of conventional art in fact.
Claims (8)
- A kind of closed grout construction method of pretension rock anchor of facing upward, described job practices utilization comprises grout pipe, pressure-bearing metal plate, gripping device and the intermediate plate etc. that blade anchor head, folder key head, easy-releasing joint, drilling rod, steel key, polyethylene are made, after anchor hole is executed bar and is finished, the pretension steel key structure that assembles is implemented sealing, implement pressure grouting and make pretension rock anchor to reach, the step of its job practices is:1, holes to desired depth with rig;
- 2, assembling steel key: the blade anchor head is received the folder key head foremost, apply pretension on steel key (look the pulling force tonnage and establish how many bundles), rise every 50-60 centimetre by fixed end a retainer ring is set, free end is coated with rust preventive oil earlier, be inserted in the polyethylene pipe, two ends are pinioned with powerful epoxy natural gum or adhesive plaster again;
- 3, live drilling rod with the rig head-clamp, drilling rod pushing folder key head hand-hole is to desired depth, if when running into rubble and stoping into key, can enter with the slight strike of head;
- 4, the rotating head drilling rod forces steel key to change a head upper end blade to open reaming, block crag, look nature of ground again and determine that blade expands the degree of opening, and when being hard rock such as sandstone, metamorphic rock as the rock stratum, blade slightly opens and can hook; During or sand shale alternating layers that soft or hard differ bad as the loose cemented of mud stone, shale, the Pliocene Epoch～Pleistocene, then continue reaming, till rig can't be spurred during toward post-tensioning, promptly the anchor head blade had blocked hole wall;
- 5, the reversing drilling rod reclaims, and the skew wall degree of the oblique square of easy-releasing joint tooth line gets loose because of difference is less;
- 6, the aperture side face is coated cement, places pressure-bearing metal plate, gripping device intermediate plate, applies the about 200 kilograms pulling force of every bundle with single rifle drawing machine, makes steel key stretch locking;
- 7, perfusion accelerating admixture (as swollen resin, water glass etc.) makes the aperture sealing;
- When 8, grout injection is to ororrhea set solid pore, closed grate hole plus-pressure grouting again, pressure kept about 20 minutes, made to be full of cement paste in the anchor hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102173 CN1076760A (en) | 1992-03-26 | 1992-03-26 | The closed grouting construction method of pretension rock anchor of facing upward |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92102173 CN1076760A (en) | 1992-03-26 | 1992-03-26 | The closed grouting construction method of pretension rock anchor of facing upward |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1076760A true CN1076760A (en) | 1993-09-29 |
Family
ID=4939500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92102173 Withdrawn CN1076760A (en) | 1992-03-26 | 1992-03-26 | The closed grouting construction method of pretension rock anchor of facing upward |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1076760A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348836C (en) * | 2004-06-25 | 2007-11-14 | 神华集团有限责任公司 | Block on through place in mine |
| CN103614687A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
| CN105714823A (en) * | 2016-03-22 | 2016-06-29 | 兰州理工大学 | Recoverable quick-anchoring and body-expanding type anchor rope and construction method |
| CN106498944A (en) * | 2015-08-27 | 2017-03-15 | （株）花郎基础 | The improved permanent anchorage construction method of structure anchors anchor with front end |
-
1992
- 1992-03-26 CN CN 92102173 patent/CN1076760A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348836C (en) * | 2004-06-25 | 2007-11-14 | 神华集团有限责任公司 | Block on through place in mine |
| CN103614687A (en) * | 2013-11-22 | 2014-03-05 | 西峡龙成特种材料有限公司 | Preparation technique of continuous casting crystallizer copper plate surface cermet coating |
| CN103614687B (en) * | 2013-11-22 | 2016-04-27 | 西峡龙成特种材料有限公司 | A kind of preparation technology of continuous casting crystallizer copper plate surface cermet coating |
| CN106498944A (en) * | 2015-08-27 | 2017-03-15 | （株）花郎基础 | The improved permanent anchorage construction method of structure anchors anchor with front end |
| CN105714823A (en) * | 2016-03-22 | 2016-06-29 | 兰州理工大学 | Recoverable quick-anchoring and body-expanding type anchor rope and construction method |
| CN105714823B (en) * | 2016-03-22 | 2017-08-29 | 兰州理工大学 | Recyclable fast anchor expands body anchor cable and construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C03 | Withdrawal of patent application (patent law 1993) | ||
| WW01 | Invention patent application withdrawn after publication |