CN102561343A - Construction method of threaded anchor rod of support structure - Google Patents
Construction method of threaded anchor rod of support structure Download PDFInfo
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- CN102561343A CN102561343A CN2012100351352A CN201210035135A CN102561343A CN 102561343 A CN102561343 A CN 102561343A CN 2012100351352 A CN2012100351352 A CN 2012100351352A CN 201210035135 A CN201210035135 A CN 201210035135A CN 102561343 A CN102561343 A CN 102561343A
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- anchor rod
- drill bit
- bolthole
- protruding thorn
- drilling
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Abstract
The invention relates to a construction method of a threaded anchor rod of a support structure. The method comprises the following steps: drilling an anchor rod hole, inserting an anchor rod body, and grouting. The step of drilling the anchor rod hole comprises two steps as follows: step one is to drill an anchor rod hole with a diameter of 80-300mm via a common drill bit, wherein the drilling depth is 100-500mm per minute; and step two is to drill the anchor rod hole again via a drill bit with convex thorns and form a threaded groove on the wall of the anchor rod hole, wherein the drilling depth is 1,000-3,000mm per minute, and cone-shaped convex thorns are arranged on one side of an upper part of the drill bit with convex thorns. In the invention, as the frictional resistance per unit area is greater than that of a traditional anchor rod, the frictional resistance between a grouted anchorage body and the wall of the anchor rod hole is greatly increased so as to increase the uplift resistance of the anchor rod and more easily ensure the quality of the anchor rod so that the support structure is safer; and on the other side, the diameter or length of the anchorage body can be reduced while ensuring that the uplift resistance of the anchor rod disclosed in the invention is the same as that of the traditional anchor rod, so that the support structure is more inexpensive.
Description
Technical field
The invention belongs to the geotechnical engineering technical field, relate to a kind of job practices that is used for the threaded anchor rod hole of supporting and protection structure in piled anchor, the plate brad supporting structure.
Background technology
At present, the domestic anchor pole that is used for bracing of foundation pit gets out the bolthole of diameter 80～300mm usually in the soil body with rig; Put into anchor pole in the bolthole; In bolthole, carry out slip casting again, form columniform slip casting anchoring body, when it receives pulling force; Form frictional force between slip casting anchoring body and its peripheral soil body, thereby produce anchored force.Existing rig adopts the helical blade drilling rod, and the bolthole that taper bit forms is the smooth hole of hole wall, and then the slip casting anchoring body after the slip casting is smooth cylinder, and the frictional force between slip casting anchoring body and hole wall is less, and the anchored force of anchor pole is lower.
Summary of the invention
In order to improve the frictional resistance between slip casting anchoring body and hole wall, thereby improve the anchored force of anchor pole in the soil body, the present invention provides a kind of job practices of improved supporting and protection structure threaded anchor rod.This method comprises following operating procedure: bore bolthole, insert anchor rod body, slip casting.The improvement that the present invention carries out the operating procedure of boring bolthole, concrete improvement technical scheme is following:
A kind of job practices of supporting and protection structure threaded anchor rod comprises following operating procedure: bore bolthole, insert anchor rod body, slip casting; Said brill bolthole is divided into two procedures; First procedure is to utilize rig earlier; Adopt common drill bit in the soil body, to get out the bolthole that diameter is 80～300 mm, the drilling depth of per minute is 100mm～500mm; Second operation work is to utilize rig, adopts the drill bit that has protruding thorn that bolthole is carried out secondary drilling, on the hole wall of bolthole, forms thread groove, and the drilling depth of per minute is 1000mm～3000mm;
Said have protruding thorn drill bit be that one side is provided with pyramidal protruding thorn on the top of drill bit.
Said pyramidal protruding thorn is the protruding thorn of cone shape protruding thorn or polygonal pyramid shape; Said polygonal pyramid is triangular pyramid or rectangular pyramid or hexagonal pyramid.
Said protruding thorn highly is 10～30 mm.
Useful technique effect of the present invention embodies in the following areas:
1, the present invention is through increasing one procedure; Promptly on the hole wall of bolthole, get out thread groove, the slip casting anchoring body that forms after the slip casting is threaded, and compares with the columniform slip casting anchoring body that conventional surface is smooth; Increased the frictional resistance between slip casting anchoring body and hole wall greatly; Thereby increased the uplift resistance of anchor pole, be easy to guarantee the anchor pole quality more, thereby made supporting and protection structure safer;
2, the present invention since the frictional resistance of unit area greater than traditional anchor pole,, can reduce the diameter or the length of anchoring body, thereby make supporting and protection structure more economically therefore reaching under the prerequisite of same uplift resistance with traditional anchor pole.
Description of drawings
Fig. 1 is applied to the pile-anchor retaining structural representation for the present invention.
Fig. 2 is that amplify the part of Fig. 1.
Fig. 3 is applied to the plate brad supporting structural representation for the present invention.
Fig. 4 is band bur drill bit structure sketch map.
Fig. 5 is the A-A sectional view of Fig. 4.
Fig. 6 is the B-B sectional view of Fig. 1.
Among the above-mentioned figure: protruding thorn 1, drill bit 2, the body of rod 3, bolthole 4, slip casting threaded anchor solid 5, threaded anchor rod 6, soil blocking pile 7, hat beam 8, waist rail 9, screw thread soil nailing 10, steel concrete surface layer 11, domatic 12, sloping end face 13, sloping bottom surface 14.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is done explanation further through embodiment.
Embodiment:
Adopt the piled anchor structure, referring to Fig. 1, Fig. 2 and Fig. 6.Soil blocking pile 7 forms piling structure by a determining deviation, and stake is connected through hat beam 8 with stake, forms campshed supporting and protection structure.Oblique threaded anchor rod 6 is set between adjacent soil blocking pile 7, and threaded anchor rod anchors in the stake stable soil body behind, and threaded anchor rod 6 is connected and power transmission through waist rail 9 with stake, forms the pile-anchor retaining structure, 10.0 meters of foundation depths.
As shown in Figure 1,0.9 meter of this example stake bore dia, 1.7 meters of pile spacings, stake is long 16 meters, gets into the sloping bottom surface of design 14 following 6 meters.10 meters of threaded anchor rod 6 length, first floor anchor pole absolute altitude are sloping end face 13 following 2.0 meters, and second layer anchor pole absolute altitude is sloping end face 13 following 5.5 meters.
The work progress in threaded anchor rod hole is following: the first step is utilized rig earlier; The common drilling rod and the drill bit 2 that adopt drill pipe diameter and the wideest footpath of drill bit to be 180mm get out the bolthole 4 that diameter is 20 mm in the soil body; The per minute drilling footage is 300mm, withdraws from drilling rod after pore-forming to the projected depth; Second step was utilized rig, adopted the drill bit with protruding thorn to creep into along bolthole, referring to Fig. 4, Fig. 5; Protruding thorn 1 is a cone, height 15mm, and the per minute drilling footage is 2000mm; Still withdraw from drilling rod after pore-forming to the projected depth, on the hole wall of bolthole, form thread groove with identical speed; The 3rd step was inserted the body of rod 3, and the body of rod 3 materials are 2 bundle 7x ф, 5 steel strand; The 4th step slip casting, material is a cement mortar, intensity M15.After finishing, slip casting forms slip casting threaded anchor solid 5.
When foundation ditch was more shallow, this job practices also can be used for the plate brad supporting structure, referring to Fig. 3, by the screw thread soil nailing 10 that anchors into sloping body that distributes by certain pitch arrays, along the steel concrete surface layer 11 of domatic 12 settings, formed the plate brad supporting structure.Reinforcing bar in the body of rod of screw thread soil nailing 10 and the steel concrete surface layer 11 is welded to connect.
Screw thread soil nailing work progress is: the first step is utilized rig earlier; The common drilling rod and the drill bit that adopt drill pipe diameter and the wideest footpath of drill bit to be 80mm get out the soil nailing hole that diameter is 10 mm in the soil body; The per minute drilling footage is 500mm, withdraws from drilling rod after pore-forming to the projected depth; Second step was utilized rig, adopted the drill bit with protruding thorn to advance along the soil nailing hole drill, and protruding thorn is triangular cone, height 5mm, and the per minute drilling footage is 2500mm, still withdraws from drilling rod with identical speed after pore-forming to the projected depth, on the hole wall in soil nailing hole, forms thread groove; The 3rd step was inserted the body of rod, and rod body material is the hot rolled ribbed steel bar of a diameter 18mm; The 4th step slip casting, material is a cement paste, intensity M10.After finishing, slip casting forms slip casting screw thread soil nailing.
Claims (3)
1. the job practices of a supporting and protection structure threaded anchor rod; Comprise following operating procedure: bore bolthole, insert anchor rod body, slip casting; It is characterized in that: said brill bolthole is divided into two procedures; First procedure is to utilize rig earlier, adopts common drill bit in the soil body, to get out the bolthole that diameter is 80～300mm, and the drilling depth of per minute is 100mm～500mm; Second operation work is to utilize rig, adopts the drill bit that has protruding thorn that bolthole is carried out secondary drilling, on the hole wall of bolthole, forms thread groove, and the drilling depth of per minute is 1000mm～3000mm;
Said have protruding thorn drill bit be that one side is provided with pyramidal protruding thorn on the top of drill bit.
2. the job practices of a kind of supporting and protection structure threaded anchor rod according to claim 1 is characterized in that: said pyramidal protruding thorn is the protruding thorn of cone shape protruding thorn or polygonal pyramid shape; Said polygonal pyramid is triangular pyramid or rectangular pyramid or hexagonal pyramid.
3. the job practices of a kind of supporting and protection structure threaded anchor rod according to claim 1 and 2 is characterized in that: said protruding thorn highly is 10～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100351352A CN102561343A (en) | 2012-02-17 | 2012-02-17 | Construction method of threaded anchor rod of support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100351352A CN102561343A (en) | 2012-02-17 | 2012-02-17 | Construction method of threaded anchor rod of support structure |
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| CN102561343A true CN102561343A (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012100351352A Pending CN102561343A (en) | 2012-02-17 | 2012-02-17 | Construction method of threaded anchor rod of support structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079523A (en) * | 1993-06-02 | 1993-12-15 | 杨德兴 | A kind of conveyor screw bored pile piling cutter |
| US5919005A (en) * | 1997-07-02 | 1999-07-06 | Integrated Stabilzation Technologies Inc. | Ground anchor device for penetrating an underground rock formation |
| CN1851150A (en) * | 2006-05-10 | 2006-10-25 | 大连理工大学 | Concrete combined cushion wedge for supporting waist beam for pile anchoring system, and its constrection method |
| CN101050630A (en) * | 2007-04-29 | 2007-10-10 | 苏州市能工基础工程有限责任公司 | Constructing process for expansion head mud nail |
| CN101629422A (en) * | 2009-08-06 | 2010-01-20 | 朱奎 | Construction method for supporting foundation ditch of reinforced cement earth wall |
-
2012
- 2012-02-17 CN CN2012100351352A patent/CN102561343A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1079523A (en) * | 1993-06-02 | 1993-12-15 | 杨德兴 | A kind of conveyor screw bored pile piling cutter |
| US5919005A (en) * | 1997-07-02 | 1999-07-06 | Integrated Stabilzation Technologies Inc. | Ground anchor device for penetrating an underground rock formation |
| CN1851150A (en) * | 2006-05-10 | 2006-10-25 | 大连理工大学 | Concrete combined cushion wedge for supporting waist beam for pile anchoring system, and its constrection method |
| CN101050630A (en) * | 2007-04-29 | 2007-10-10 | 苏州市能工基础工程有限责任公司 | Constructing process for expansion head mud nail |
| CN101629422A (en) * | 2009-08-06 | 2010-01-20 | 朱奎 | Construction method for supporting foundation ditch of reinforced cement earth wall |
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Application publication date: 20120711 |