CN101768973B - Method and equipment for setting rotary-jet steel strand ground anchor - Google Patents

Method and equipment for setting rotary-jet steel strand ground anchor Download PDF

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Publication number
CN101768973B
CN101768973B CN2010101048103A CN201010104810A CN101768973B CN 101768973 B CN101768973 B CN 101768973B CN 2010101048103 A CN2010101048103 A CN 2010101048103A CN 201010104810 A CN201010104810 A CN 201010104810A CN 101768973 B CN101768973 B CN 101768973B
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steel strand
cement
pipe
drill bit
pushing tow
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CN101768973A (en
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汪哲荪
朱大勇
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The invention discloses a method and equipment for setting a rotary-jet steel strand ground anchor. The method is characterized by comprising the following steps of: under the condition of not digging up the ground, drilling deep in the ground by adopting a double-tube rotary-jet ground anchor drill; rotating and jetting high-pressure cement slurry; cutting, peeling, smashing and stirring foundation soil; chambering to form cement-soil mixed material blocks; top-pushing the steel strand out from a central pipe of the drill; dispersing steel strand anchor head steel wires with hooks and inserting the steel strand anchor head steel wires into the non-solidified cement-soil mixed materials; and rotating and withdrawing the drill to make the external part of the steel strand form a protective layer to form the ground anchor after the cement-soil mixed materials are solidified. Due to the adoption of the method and the equipment, the ground anchor is suitable for different foundation soil and anchoring angles and has the characteristics of having small occupied area and little influence on an environment, fully exerting material characteristic, greatly enhancing anchoring capacity and reducing cost. A novel anchoring method is provided for a large anchoring construction structure or equipment and the like.

Description

The method and apparatus of rotary-jet steel strand ground anchor is set
Technical field
The present invention relates to the fixedly method to set up and the equipment thereof of earth anchor such as engineering structures, equipment, the method and apparatus of rotary-jet steel strand ground anchor is set specifically.
Background technology
At present, adopt hawser fixedly the breaking of mode such as engineering structures, equipment, cross-arm, native anchor with having or etc.If break with adopting, mode anchorings such as cross-arm, native anchor or driven pile, can only be applicable to the occasion that anchored force is less; If adopt mode anchorings such as castinplace pile,, the condition, cost and the time that are provided with have also been increased though can strengthen anchored force.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that rotary-jet steel strand ground anchor is set.Under the situation that does not excavate ground, adopt double pipe churning earth anchor drill bit to pierce the depths, stratum, steel strand anchor head flower is arranged in the formation, diameter is the earth anchor of the cement-soil compound agglomerate of 1~2m, high about 2m, for the fixing engineering structures of the big anchor-hold of need, equipment etc., provide a kind of new anchoring process.
Technical solution problem of the present invention adopts following technical scheme:
The characteristics that the present invention is provided with the method for rotary-jet steel strand ground anchor are to carry out according to the following procedure:
A, be provided with on the ground of earth anchor, settle rig and heap to build the cofferdam of slagging tap in boring zone at needs; Double pipe churning earth anchor drill bit is installed on described rig, and described double pipe churning anchor drill bit has the independent centre bore that is provided with and sidepiece is penetrated the slurry hole;
B, spud in by the drilling rod angle of setting, in boring, the sidepiece of transfusion device, drilling rod and double pipe churning earth anchor drill bit that slush pump connects by feed pipe for mortar, drilling rod top is successively penetrated slurry hole churning clay mortar in boring and is carried out retaining wall and slag tap;
C, when boring reaches set depth, drill bit continues rotation but drilling depth not, slush pump stops transporting clay mud; The mixer cement paste in the stock tank that begins to mix cement, and extract cement paste by slush pump in the cement stock tank and flow to drill bit; Described double pipe churning earth anchor drill bit is penetrated slurry hole gunite in boring by its sidepiece in rotation, form churning, by the cement paste that ejects cut, peel off, foundation soil is holed in broken and stirring; When described double pipe churning earth anchor drilling capitiform becomes churning, repeatedly carry back and forth and bore and bore down, form cement-soil compound agglomerate; Again drill bit is parked in 1/3 and proposes highly place of brill, release after slush pump keep-uped pressure five minutes;
D, unload transfusion device and feed pipe for mortar, change pushing tow pipe jack is installed from the top of drilling rod; The interior pushing tow pipe that is installed with steel strand is inserted in the pushing tow hole of jack, pursue joint spreading pushing tow pipe with nipple at the afterbody of pushing tow pipe, by the jack pushing tow, the centre bore that the moving steel strand of pushing tow pipe racks pass drilling rod and drill bit inserts cement-soil compound agglomerate, return the pushing tow pipe then, the steel strand anchor head flower that makes front end have crotch is trapped in the cement-soil compound agglomerate of ot-yet-hardened; Slush pump is pressed into cement paste once more, meanwhile carries brill while rotating until withdraw from drill bit from boring, forms cement-soil compound topping with cement paste in the outside of steel strand;
E, exceptionally straight steel strand on the ground are fixed on the place, centre position of cement-soil compound topping with steel strand, treat that cement-soil compound agglomerate solidifies the setting of promptly finishing an earth anchor.
The characteristics that the present invention is provided with the method for rotary-jet steel strand ground anchor also are:
In described step b, carrying out retaining wall by slush pump transporting clay mud is 0.5~1.0Mpa with the mud jacking pressure of slagging tap;
In described step c, be 6.3~21Mpa by the mud jacking pressure of slush pump transporting water mud when forming cement-soil compound agglomerate;
In described steps d, it is 1~3Mpa with the mud jacking pressure that forms the outside cement-soil compound of steel strand topping that slush pump is pressed into cement paste once more;
Rotary speed during described bit bore is 10~20r/min; Rotary speed during churning is 1~5r/min; The rotary speed of carrying when boring is 5~10r/min.
The design feature of using steel strand anchor head flower in the methods of the invention is: described steel strand anchor head flower is to be not less than the 50cm place in distance steel strand end, outwards is dispersed into by a branch of steel wire twisted wire to be the umbrella frame shape, and the end of each root steel wire outwards is crotch.
The design feature of using steel strand pushing tow pipe in the methods of the invention is that described steel strand pushing tow pipe is the equal diameter pipe, the front end of first pushing tow pipe sidewall upper edge within it is axially arranged with a thin silk groove, the tail end of first pushing tow pipe is a threaded ends, is connected described first pushing tow pipe all the other each root pushing tow pipes afterwards and all is set to threaded ends at two ends.
The characteristics of using double pipe churning earth anchor drill bit in the methods of the invention be have connect successively and with cutter saddle, bite stand, guide pipe and the tool joint of the coaxial setting in drill bit axis, in described drill bit, the centre bore that runs through drill bit along axis is penetrated the slurry separate setting in hole with the port of export axis sidepiece vertical with drill axis, is provided with the cap stopper that can be gone out by pushing tow at the port of export of described centre bore.
The design feature of double pipe churning earth anchor drill bit of the present invention also is:
Described cutter saddle is a cross shape, be welded with the carbide alloy bloom on the front end of cutter saddle and the outer side edges as blade, the center of cutter saddle is a manhole, and cap stopper is inserted in the manhole, corresponding axial convex tendon and the groove of being provided with between described manhole and cap stopper; Described bite stand is the column with central through hole, and the front end of described cap stopper is inserted in the central through hole of bite stand, is provided with the spring self-locking card between described cap stopper and bite stand; Sidepiece on the described drill bit is penetrated the sidepiece that the slurry hole is positioned at the bite stand.
Described tool joint and guide pipe are internal and external casing, and pipe is connected with the central through hole of described bite stand in it, forms the centre bore of described drill bit; Its outer tube is penetrated the slurry hole with the sidepiece of described drill bit and is connected.
The inventive method is applicable to different foundation soils such as silt, clay, gravel, is applied to engineering structures and equipment etc.Can on the anchorage point of engineering structures, equipment etc., several rotary-jet steel strand ground anchors be set, each earth anchor is spent an end of steel strand with the steel wire anchoring form is anchored in the cement-soil agglomerate of foundation soil depths churning, the other end is connected with engineering structures or equipment etc., tightens the anchoring of just having finished behind the steel strand engineering structures, equipment etc.
Rotary-jet steel strand ground anchor of the present invention is based on following operating principle:
1, the bearing capacity of steel strand: by national GB5224 standard, the steel strand that China produces are divided into 6 kinds of specifications, and its rank is 1470~1670N/mm 2, steel strand nominal diameter Ф is 9.0~15.0mm, minimum Fracture Force is 83.89~250.80KN, and has good underrelaxation characteristic;
2, the cement-soil mixture produces bond stress to steel strand: according to relevant technologies regulation and stipulation and verification experimental verification, steel strand reach in the cement-soil mixture 〉=anchorage length of 250mm, and the adhesion strength between them just can be enough to the shear stress of role-taking on steel strand steel wire and cement-soil compound interface; Steel strand and cement-soil compound have roughly the same linear expansion coeffcient, and (steel strand are 1.2 * 10 -5/ C; Cement-soil compound average out to 1.0 * 10 -5/ C), can not produce excessive temperature deformation and stress; And the cement-soil compound has alkalescent, and the cement-soil compound is wrapped in steel strand, plays the effect of not corrosion of protection steel strand.
3, the theory and the experimental verification of utilization " soil mechanics " draw the mechanical characteristic of soil bolt by French Habib formula, draw the ultimate pullout capacity P of rotary-jet steel strand ground anchor UgFor:
P ug=F+Q=πD 1Z1 Z1+L1T zdz+πD 2Z2 Z2+L2T zdz+qA
In the formula: Pug---the ultimate pullout capacity (KN) of earth anchor;
Total collateral resistance (KN) of F---anchoring body circumferential surface;
Total end resistance (KN) of Q---anchoring body compression face;
D1---anchoring body diameter (cm);
D2---the diameter (cm) of anchoring body reaming part;
T Z---the limit collateral resistance (Mpa) on the degree of depth Z place unit area;
Q---the compressive strength (Mpa) of the anchoring body reaming part soil body;
A---the bearing area (cm of anchoring body reaming part 2);
L 1, L 2---length (cm).
The stressed sketch of concrete rotary-jet steel strand ground anchor, as shown in Figure 5.The evolution of F and Q is inconsistent, and when the pulling capacity P that is subjected to when anchor pole was very little, bearing capacity almost all was made of collateral resistance F.When pulling capacity P is enough big, and when making collateral resistance reach maximum value, end resistance just begins to play a role, and this moment, the increase of Q replenished reducing of F, and supporting capacity is maintained.According to the design feature of rotary-jet steel strand ground anchor, the diameter D of anchoring body reaming part 2Much larger than anchoring body diameter D 1So the bearing capacity of rotary-jet steel strand ground anchor is mainly born by end resistance Q.Rotary-jet steel strand ground anchor reaches 5~25m in drilling depth as calculated, is in when foundation soil under the situation of state of limit equilibrium, and the anchor-hold that can bear is about 100~2000KN.Thereby draw the minimum Fracture Force of the uplift resistance of rotary-jet steel strand ground anchor much larger than single steel strand.
According to above-mentioned force analysis and prototype test to each specifications and models steel strand, different churning drilling depth and foundation soil, cement-soil mixture and steel strand bond stress etc., drawing rotary-jet steel strand ground anchor is can bear bigger anchor-hold fully.During concrete the application, as required anchor-hold size, adopts different drilling depths, churning highly and diameter, and the rotary-jet steel strand ground anchor of selecting one or more steel strand for use.
Double pipe churning earth anchor drill bit is based on following operating principle among the present invention:
When foundation soil is the silt of shot structure, clay, when sand or gravel, rotation along with double pipe churning drill bit, eject progressively expanded scope ground cutting of cement paste by whitewashing mouth high-voltage high-speed, peel off, broken and break up foundation soil, in impact force, under the acting in conjunction of centrifugal force and gravity, regularly the foundation soil structure is rearranged, with the foundation soil is raw material, stir into the cement-soil mixture by certain water/binder ratio and soil paste ratio, treat to obtain 5~20Mpa unconfined compression strength after the cement-soil mixture solidifies, with satisfy with steel strand anchor head flower steel wire bond anchored force and the total end resistance Q that resists the anchoring body compression face.
Steel strand anchor head flower is based on following operating principle among the present invention:
Each root steel wire of steel strand anchor head flower is embedded in the pushing tow inside pipe wall and dredges in the silk groove, and the steel wire crotch that stretches out colludes on the pushing tow tube wall.When the pushing tow pipe racks steel strand downwards pushing tow is inserted in the interior pipe of drilling rod and drill bit, make steel strand closely follow the pushing tow pipe and insert downwards.Steel strand when the pushing tow pipe racks inserts in the cement mass of soil, when withdrawing the pushing tow pipe again, because recovering former, steel strand band crotch steel wire flexiblely outwards evenly scatters, the anchor-hold that produces in the cement-soil mixture is much larger than the frictional force of pushing tow inside pipe wall and steel strand, so be easy to during pushing tow pipe retraction form slippage, steel strand anchor head flower steel wire be trapped in the cement-soil agglomerate with steel strand.When pushing tow pushing tow pipe once more inserted, pushing tow pipe pipe end was supporting the steel strand anchor head flower steel wire that the umbrella frame shape scatters and is inserting jointly.Like this, repeat repeatedly pushing tow or retraction step by step, steel strand anchor head flower steel wire is stayed in the cement-soil agglomerate by the length of designing requirement.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention is applicable to different foundation soils such as silt, clay, gravel, have stressed clear and definite, give full play to material behavior, easy construction fast, material economizes, cost is low, take up an area of less, to little, the different anchoring angle of ambient influnence, can form the characteristics of the big anchor-hold of 100~2000KN, for the fixing engineering structures of the big anchor-hold of need, equipment etc., provide a kind of new anchoring process.
Description of drawings
Fig. 1 is a rotary-jet steel strand ground anchor job practices schematic diagram of the present invention.
Fig. 2 A is double pipe churning earth anchor drill bit sectional structure schematic diagram among the present invention.
Fig. 2 B is double pipe churning earth anchor drill bit plan structure schematic diagram among the present invention.
Fig. 2 C is the right TV structure schematic diagram of double pipe churning earth anchor drill bit among the present invention.
Fig. 2 D is double pipe churning earth anchor drill bit left side TV structure schematic diagram among the present invention.
Fig. 3 A is cap stopper master TV structure schematic diagram among the present invention.
Fig. 3 B is cap stopper plan structure schematic diagram among the present invention.
Fig. 3 C is the right TV structure schematic diagram of cap stopper among the present invention.
Fig. 4 A is pushing tow pipe sectional structure schematic diagram among the present invention.
Fig. 4 B is pushing tow pipe plan structure schematic diagram among the present invention.
The right TV structure schematic diagram of pushing tow pipe among Fig. 4 C the present invention.
Fig. 5 is the stressed sketch of rotary-jet steel strand ground anchor among the present invention.
Number in the figure: 1 double pipe churning earth anchor drill bit, 2 cap stoppers, 3 axial convex tendons, 4 spring self-locking cards, 5 cross formula cutter saddles, 6 carbide alloy blooms, 7 bite stands, 8 sidepieces are penetrated pipe, 11 tool joints in slurry hole, 9 guide pipes, 10; 21 steel strand anchor heads flower, 22 cement-soil compound agglomerates; 30 pushing tow pipes, 31 are dredged a groove, 32 threaded ends; 40 rigs, 41 drilling rods, 42 transfusion devices, 43 feed pipe for mortar, 44 mud jacking materials, 45 ground.
The specific embodiment
The method that rotary-jet steel strand ground anchor is set in the present embodiment is to carry out according to the following procedure:
1, referring to Fig. 1, be provided with at needs on the ground 45 of earth anchor, settle rig 40 and heap to build the cofferdam of slagging tap in boring zone; Double pipe churning earth anchor drill bit 1 (shown in Fig. 2 A, 2B, 2C, 2D) is installed on rig 40, and double pipe churning anchor drill bit 1 has the independent centre bore that is provided with and sidepiece is penetrated slurry hole 8;
2, spud in by the drilling rod angle of setting, in boring, the sidepiece of the transfusion device 42 that slush pump connects by feed pipe for mortar 43, drilling rod top, drilling rod 41, double pipe churning earth anchor drill bit 1 is penetrated slurry hole 8 churning clay mortar in boring and is carried out retaining wall and slag tap;
3, when boring reaches set depth, drill bit 1 continues rotation but drilling depth not, and slush pump stops transporting clay mud; The mixer cement paste in the stock tank that begins to mix cement, and extract cement paste by slush pump in the cement stock tank and flow to drill bit 1; Double pipe churning earth anchor drill bit 1 is penetrated slurry hole 8 gunite in boring by its sidepiece in rotation, form churning, by the cement paste that ejects cut, peel off, foundation soil is holed in broken and stirring; When double pipe churning earth anchor drill bit 1 forms churning, repeatedly carry back and forth and bore and bore down, carrying brill highly is 1.5~2.5m, the formation diameter is that 1~2m, height are the cement-soil compound agglomerate 22 of 1.5~2.5m; Again drill bit 1 is parked in 1/3 and proposes highly place of brill, release after slush pump keep-uped pressure five minutes;
4, unload transfusion device 42 and feed pipe for mortar 43 from the top of drilling rod 41, change pushing tow pipe jack is installed; The interior pushing tow pipe 30 that is installed with steel strand is inserted in the pushing tow hole of jack, pursue joint spreading pushing tow pipe 30 with nipple at the afterbody of pushing tow pipe 30, by the jack pushing tow, pushing tow pipe 30 drives the centre bore insertion cement-soil compound agglomerate 22 that steel strand pass drilling rod 41 and drill bit 1, return pushing tow pipe 30 then, the steel strand anchor head that makes front end have crotch spends 21 to be trapped in the cement-soil compound agglomerate 22 of ot-yet-hardened; Slush pump is pressed into cement paste once more, meanwhile carries brill while rotating until withdraw from drill bit 1 from boring, forms the cement-soil compound topping of diameter greater than 10cm with cement paste in the outside of steel strand;
E, exceptionally straight steel strand on the ground are fixed on the place, centre position of cement-soil compound topping with steel strand, treat that cement-soil compound agglomerate 22 solidifies the setting of promptly finishing an earth anchor.
In concrete the enforcement, be arranged in the step 2, is 0.5~1.0Mpa by slush pump transporting clay mud with the mud jacking pressure of protecting borehole wall or slag tap, in step 3, by the mud jacking pressure of slush pump transporting water mud when forming cement-soil compound agglomerate is 6.3~21Mpa, in step 4, it is 1~3Mpa with the mud jacking pressure that forms the outside cement-soil compound of steel strand topping that slush pump is pressed into cement paste once more; Rotary speed when bit bore is set is 10~20r/min; Rotary speed during churning is 1~5r/min; The rotary speed of carrying when boring is 5~10r/min.
Applied equipment comprises in the present embodiment:
Steel strand anchor head shown in Figure 1 spends 21, is to be not less than the 50cm place in distance steel strand end, outwards is dispersed into by a branch of steel wire twisted wire to be the umbrella frame shape, and the end of each root steel wire outwards is crotch.
Steel strand pushing tow pipe 30 shown in Fig. 4 A, 4B, the 4C, be the equal diameter pipe, the front end of first pushing tow pipe sidewall upper edge within it is axially arranged with a thin silk groove 31, the tail end of first pushing tow pipe is a threaded ends 32, is connected described first pushing tow pipe all the other each root pushing tow pipes afterwards and all is set to threaded ends 32 at two ends.
The drill bit of double pipe churning earth anchor shown in Fig. 2 A, 2B, 2C and Fig. 2 d, have successively connect and with cutter saddle 5, bite stand 7, guide pipe 9 and the tool joint 11 of the coaxial setting in drill bit axis, in drill bit 1, independently be provided with the centre bore that runs through drill bit along axis and penetrate slurry hole 8 with the port of export axis sidepiece vertical with drill axis, be provided with the cap stopper 2 that can be gone out by pushing tow at the port of export of centre bore, the form of structure of cap stopper 2 is shown in Fig. 3 A, Fig. 3 B and Fig. 3 C.
Shown in Fig. 2 A, 2B, 2C and Fig. 2 d and Fig. 3 A, Fig. 3 B and Fig. 3 C, in concrete the enforcement:
Cutter saddle 5 is a cross shape, be welded with carbide alloy bloom 6 on the front end of cutter saddle 5 and the outer side edges as blade, the center of cutter saddle 5 is a manhole, and cap stopper 2 is inserted in the manhole, corresponding axial convex tendon 3 and the groove of being provided with between manhole and cap stopper; Described bite stand 7 is the columns with central through hole, and the front end of cap stopper is inserted in the central through hole of bite stand 7, is provided with spring self-locking card 4 between cap stopper and bite stand 7; Sidepiece on the drill bit is penetrated the sidepiece that slurry hole 8 is positioned at bite stand 7.
Tool joint 11 is internal and external casing with guide pipe 9, and pipe is connected with the central through hole of bite stand 7 in it, forms the centre bore of drill bit; Its outer tube is penetrated slurry hole 8 with the sidepiece of drill bit and is connected.
The effect of double pipe churning earth anchor drill bit 1 is the angle according to designing requirement, on ground 45, bore to reach projected depth, and can the churning cement paste and pushing tow go out the steel strand anchor head and spend 21.The effect of cap stopper 2 is to manage in 10 in boring or the mud jacking material 44 that can prevent clay mortar or cement paste during churning enter; Spend at 21 o'clock at pushing tow pipe 30 pushing tow steel strand anchor heads, can in cross formula cutter saddle 5 central bore, eject cap stopper 2, successfully allow pushing tow pipe 30 pushing tows go out the steel strand anchor head and spend 21.In addition, the packer ring on the cap stopper 2 can prevent that mud jacking material 44 from entering bite stand 7.The effect of cross formula cutter saddle 5 is cutting foundation soil boring and temporary fixed cap stoppers 2 downwards.The effect of carbide alloy bloom 6 is the blade grinding foundation soils as cross formula cutter saddle 5, prolongs the application life of double pipe churning earth anchor drill bit 1.Bite stand 7 is to be used to connect cutter saddle 5 and guide pipe 9, and fixing whitewashing mouth and cap stopper 2 are as carrying mud jacking material 44 and pushing tow steel strand anchor head to spend 21 passage.Sidepiece is penetrated slurry hole 8 and is used for fixing the whitewashing mouth, with clay mortar or the high fast direction foundation soil of cement paste.Guide pipe 9 is the guiding during for double pipe churning earth anchor drill bit 1 boring, making boring keep straight, and cross formula bite stand 7 is connected with tool joint 11, as failing the passage of starching.Be the passage of defeated mud jacking material 44 between the pipe outside of interior pipe 10 and guide pipe 9 inside walls, managing the inboard is the passage of pushing tow pipe 30.Tool joint 11 is that guide pipe 9 is connected with drilling rod 41 with interior pipe 10.Pushing tow pipe 30 is used for temporary fixed steel strand anchor head and spends 21, so that pushing tow carries the steel strand anchor head to spend 21 to insert and be trapped in the cement-soil compound agglomerate 22.Dredging silk groove 31 is to spend 21 band crotch steel wire for making the steel strand anchor head in order, makes it can outwards insert cement-soil compound agglomerate 22 with being evenly distributed.21 the effect of spending of steel strand anchor head is the bond stress that increases steel strand and cement-soil compound agglomerate 22, and steel strand are taken root at cement-soil compound agglomerate 22, allows the steel strand be the fixing connector of engineering structures, equipment etc. and earth anchor.The effect of cement-soil compound agglomerate 22 is to solidify the back anchor to live the steel strand anchor head and spend 21, resists total end resistance Q of anchoring body compression face, increases lifting surface area and uplift resistance, spends 21 to become ground tackle with the steel strand anchor head.Rig 40 provides power for double pipe churning drill bit 1, by the angle boring of designing requirement, and cooperates pushing tow steel strand anchor head to spend 21.
Operating process:
1, on being provided with the ground of earth anchor, need measure setting-out.
2, rig is placed on the boring position of earth anchor, and builds the cofferdam of slagging tap at the scope heap in boring zone.
3, double pipe churning earth anchor drill bit is installed on the drilling rod of rig, by spudding in after the designing requirement adjustment drilling rod angle.
4, slush pump extracts clay mortar and flows to rig from mud pit, and double pipe churning earth anchor drilling is slagged tap on the rotary drilling limit in front.
5, after double pipe churning earth anchor bit drills reaches the projected depth of stratum 5~20m, continue rotation but drilling depth not, slush pump stops to the rig slurry conveyed.
6, the mixer slurry that mixes cement, slush pump change and extract the cement paste of mixing Admixture in the cement stock tank and flow to rig.Double pipe churning earth anchor drilling rotates the limit high-pressure injection in front and goes out cement paste, cut, peel off, broken and stir foundation soil, after slowly at the uniform velocity upwards carrying about brill 2m again, reaming and stirring repeatedly back and forth up and down, the formation diameter is the cement-soil compound agglomerate of 1~2m, high about 2m.
7, double pipe churning earth anchor drill bit is parked in 1/3 height (position, lower middle of about cement-soil compound agglomerate) of carrying brill and locates, slush pump is held and is pressed release again in 5 minutes.
8, unload the transfusion device and the feed pipe for mortar of defeated slurry from the drilling rod top, install the jack of steel strand ejector sleeve special use.The ejector sleeve of interior steel strand is inserted from the pushing tow hole of special-purpose jack, behind nipple spreading ejector sleeve, reach the bottom of double pipe churning earth anchor drill bit through drilling rod, back down cap stopper in the cross cutter saddle, the pushing tow pipe that will have steel strand inserts in the cement-soil compound agglomerate.
9, jack is drawn back ejector sleeve downward pushing tow 5cm at the bottom of the drill bit pushing tow pipe and is returned original position, allows the thin silk groove of band crotch steel wire forwards pipe end of steel strand anchor head flower, recovers the former insertion and being trapped in the also not solidified cement-soil compound of flexiblely outwards scattering.Like this, repeat repeatedly step by step steel strand anchor head flower all to be trapped in the cement-soil compound agglomerate by design length.
10, after jack withdraws from whole ejector sleeves, pull down jack, load onto transfusion device and feed pipe for mortar again.
11, rig is started shooting again, and slush pump is imported cement paste with low pressure, and drill bit upwards retreats to ground while rotating, and makes the outside formation of steel strand diameter be not less than the cement-soil compound topping of 10cm.
12, the exceptionally straight steel strand of suitably exerting oneself on the ground are fixed on cement-soil compound topping centre position to steel strand.
13, treat that the cement-soil compound solidifies after, finished the setting of an earth anchor when the time comes.
14,, adopt above-mentioned method to finish the earth anchor of other roots according to the spacing of designing requirement.

Claims (3)

1. the method for rotary-jet steel strand ground anchor is set, it is characterized in that carrying out according to the following procedure:
A, be provided with on the ground (45) of earth anchor, settle rig (40) and heap to build the regional cofferdam of slagging tap of boring at needs; Go up installation double pipe churning earth anchor drill bit (1) at described rig (40), described double pipe churning earth anchor drill bit (1) has the independent centre bore that is provided with and sidepiece is penetrated slurry hole (8);
B, spud in by the drilling rod angle of setting, in boring, the sidepiece of transfusion device (42), drilling rod (41) and double pipe churning earth anchor drill bit (1) that slush pump connects by feed pipe for mortar (43), drilling rod top is successively penetrated slurry hole (8) churning clay mortar in boring and is carried out retaining wall and slag tap;
C, when boring reaches set depth, drill bit (1) continues rotation but drilling depth not, slush pump stops transporting clay mud; The mixer cement paste in the stock tank that begins to mix cement, and extract cement paste by slush pump in the cement stock tank and flow to drill bit (1); Described double pipe churning earth anchor drill bit (1) is penetrated slurry hole (8) gunite in boring by its sidepiece in rotation, form churning, by the cement paste that ejects cut, peel off, foundation soil is holed in broken and stirring; When described double pipe churning earth anchor drill bit (1) forms churning, repeatedly carry back and forth and bore and bore down, form cement-soil compound agglomerate (22); Again drill bit (1) is parked in 1/3 and proposes highly place of brill, release after slush pump keep-uped pressure five minutes;
D, unload transfusion device (42) and feed pipe for mortar (43) from the top of drilling rod (41), change pushing tow pipe jack is installed; The interior pushing tow pipe (30) that is installed with steel strand is inserted in the pushing tow hole of jack, pursue joint spreading pushing tow pipe (30) with nipple at the afterbody of pushing tow pipe (30), by the jack pushing tow, pushing tow pipe (30) drives the centre bore insertion cement-soil compound agglomerate (22) that steel strand pass drilling rod (41) and drill bit (1), return pushing tow pipe (30) then, the steel strand anchor head flower (21) that makes front end have crotch is trapped in the cement-soil compound agglomerate (22) of ot-yet-hardened; Slush pump is pressed into cement paste once more, meanwhile carries brill while rotating until withdraw from drill bit (1) from boring, forms cement-soil compound topping with cement paste in the outside of steel strand;
E, exceptionally straight steel strand on the ground are fixed on the place, centre position of cement-soil compound topping with steel strand, treat that cement-soil compound agglomerate (22) solidifies the setting of promptly finishing an earth anchor;
The structure of described double pipe churning earth anchor drill bit is set to:
Have successively connect and with cutter saddle (5), bite stand (7), guide pipe (9) and the tool joint (11) of the coaxial setting in drill bit axis, in described drill bit, the centre bore that runs through drill bit along axis is penetrated the slurry separate setting in hole (8) with the port of export axis sidepiece vertical with drill axis, is provided with the cap stopper (2) that can be gone out by pushing tow at the port of export of described centre bore;
Described cutter saddle (5) is a cross shape, be welded with carbide alloy bloom (6) on the front end of cutter saddle (5) and the outer side edges as blade, the center of cutter saddle (5) is a manhole, cap stopper (2) is inserted in the manhole, corresponding axial convex tendon (3) and the groove of being provided with between described manhole and cap stopper (2); Described bite stand (7) is the column with central through hole, and the front end of described cap stopper (2) is inserted in the central through hole of bite stand (7), is provided with spring self-locking card (4) between described cap stopper (2) and bite stand (7);
Sidepiece on the described drill bit is penetrated the sidepiece that slurry hole (8) is positioned at bite stand (7); Described tool joint (11) is internal and external casing with guide pipe (9), and pipe is connected with the central through hole of described bite stand (7) in it, forms the centre bore of described drill bit; Its outer tube is penetrated slurry hole (8) with the sidepiece of described drill bit and is connected.
2. the method that rotary-jet steel strand ground anchor is set according to claim 1 is characterized in that:
In described step b, carrying out retaining wall by slush pump transporting clay mud is 0.5~1.0Mpa with the mud jacking pressure of slagging tap;
In described step c, be 6.3~21Mpa by the mud jacking pressure of slush pump transporting water mud when forming cement-soil compound agglomerate;
In described steps d, it is 1~3Mpa with the mud jacking pressure that forms the outside cement-soil compound of steel strand topping that slush pump is pressed into cement paste once more;
Rotary speed during described bit bore is 10~20r/min; Rotary speed during churning is 1~5r/min; The rotary speed of carrying when boring is 5~10r/min.
3. steel strand pushing tow pipe that is applied in the described method of claim 1, it is characterized in that: described steel strand pushing tow pipe (30) is the equal diameter pipe, the front end of first pushing tow pipe sidewall upper edge within it is axially arranged with a thin silk groove (31), the tail end of first pushing tow pipe is a threaded ends, is connected described first pushing tow pipe all the other each root pushing tow pipes afterwards and all is set to threaded ends at two ends.
CN2010101048103A 2010-02-01 2010-02-01 Method and equipment for setting rotary-jet steel strand ground anchor Expired - Fee Related CN101768973B (en)

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Publication number Priority date Publication date Assignee Title
CN102425389A (en) * 2011-09-19 2012-04-25 中铁十二局集团第七工程有限公司 Bore-bottom slag removing method for cast-in-place pipe bore in underground river, slag taking-out barrel and slag-removing blowing system
CN104563106B (en) * 2014-12-30 2016-05-18 中国建筑第八工程局有限公司 The construction technology of a kind of churning anchor cable drill body and churning anchor cable
CN110657974A (en) * 2019-09-30 2020-01-07 武大巨成结构股份有限公司 Anti-pulling test method for anchor head of reaming self-locking anchor rod

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