CN103774648A - Pre-stressed anchor rod prevented from being pulled out of anchor hole - Google Patents

Pre-stressed anchor rod prevented from being pulled out of anchor hole Download PDF

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Publication number
CN103774648A
CN103774648A CN201210412808.1A CN201210412808A CN103774648A CN 103774648 A CN103774648 A CN 103774648A CN 201210412808 A CN201210412808 A CN 201210412808A CN 103774648 A CN103774648 A CN 103774648A
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China
Prior art keywords
anchor
anchor rod
hole
bowl
tooth
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Granted
Application number
CN201210412808.1A
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Chinese (zh)
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CN103774648B (en
Inventor
言志信
江平
曾明正
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Lanzhou University
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Lanzhou University
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Publication date
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Priority to CN201210412808.1A priority Critical patent/CN103774648B/en
Publication of CN103774648A publication Critical patent/CN103774648A/en
Application granted granted Critical
Publication of CN103774648B publication Critical patent/CN103774648B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention relates to a pre-stressed anchor rod prevented from being pulled out of an anchor hole. The pre-stressed anchor rod prevented from being pulled out of the anchor hole comprises an anchor rod body with an expansion plug, an expansion tooth bowl, a pad table, a stool plate and a nut. Anchor rod holes are formed in the pad table and the stool plate, the top end of the anchor rod body penetrates through the anchor rod hole of the pad table and the anchor rod hole of the stool plate and then is connected with the nut together, and the expansion plug is arranged in the expansion tooth bowl. The pre-stressed anchor rod prevented from being pulled out of the anchor hole is simple in structure, low in cost and convenient to construct, a pull force-pressure-plug novel combined pre-stressed anchoring system is structured, the anchor rod can be prevented from being pulled out of the anchor hole along with grouting, and the stability of the rock-soil body, the safety of engineering and the debility of anchoring are improved.

Description

A kind of prestressed anchor of extracting from anchor hole of preventing
Technical field
The present invention relates to Anchorage Technology, relate in particular to a kind of prestressed anchor of extracting of preventing from anchor hole.
Background technology
Ground anchorage is by being embedded in the anchor pole in stratum, stratum is locked together tightly, rely on the interaction of anchor pole-injecting cement paste-hole wall ground muscle power, transfer and improve self intensity and self-stable ability of Rock And Soil, guarantee the stable of outside Rock And Soil to improve stress state, thereby guarantee the technology of engineering safety.The engineering application of Anchorage Technology started from for 19 end of the centurys, along with the development of its theory and technology, the departments such as mine, water conservancy, water power, highway, railway, municipal administration, urban construction, geology, military project are now extended to, as a kind of comparatively desirable support form, in slope project, underground construction, deep-foundation pit engineering, obtain extensive use, in national economy major project, bring into play key effect.
Ground anchorage is not only subject to the impact of formation lithology, Rock-soil Mass Structure, geological structure, hydrogeology, topography and geomorphology etc., also may be subject to the effect of violent earthquake, and they all constitute a threat to the safety of ground anchorage.
At construction and the run duration of ground anchorage, anchor pole extract from anchor hole together with injecting cement paste be the most substantially, the most typical, the most general ground anchorage mode of failure, it will cause ground anchorage to lose efficacy, and bring hidden danger to engineering safety, thus the anchored force that restriction anchor pole can provide.Thereby, when the anchored force that provides when needs is larger, common bolt anchoring can not meet the requirement of engineering, restricting Anchorage Technology application and development, how to improve the load pass through mechanism of ground anchorage, overcome the drawback of common anchoring, become the fundamental way that improves anchor-holding force of anchor bolt, improves anchoring effect.
In addition, injecting cement paste almost can not provide anchored force at the anchoring initial stage, thereby can not adapt to the requirement of needs supporting immediately after weak rocks soil body excavation.Although existing pipe-seam type anchor rod overcomes to some extent to above-mentioned shortcoming, after rockbolt installation, can provide immediately anchored force, be conducive to control in time the distortion of Rock And Soil, the anchored force that can provide is little; Meanwhile, because soft rock-soil cognition is clamp-oned tube chamber from the pipe seam of pipe-seam type anchor rod, cause the reduction of anchored force.
Summary of the invention
Technical problem to be solved by this invention is to provide and a kind of can improve and anchored force is provided immediately, the prestressed anchor that the preventing of saving material, easy construction extracted from anchor hole.
For addressing the above problem, a kind of prestressed anchor of extracting from anchor hole of preventing of the present invention, is characterized in that: it comprises anchor rod body, expansion tooth bowl and pad platform, backing plate, the nut of bottom with expansible stopper; On described pad platform and described backing plate, be equipped with bolthole; The top of described anchor rod body connects together with described nut through the bolthole of described pad platform and described backing plate successively; Described expansible stopper is placed in described expansion tooth bowl.
Described expansible stopper is truncated cone-shaped.
The top of described anchor rod body is provided with screw thread.
Described expansion tooth bowl is little bowl-shape in mouthful large end, and its opening upwards, is circumferentially being spacedly distributed and the tooth being connected at the bottom of bowl, and the inner surface of this tooth is distributed with multiple annular platforms, and the inner surface of described tooth and the side of described expansible stopper coincide.
On described backing plate, have an injected hole.
The present invention compared with prior art has the following advantages:
1, the present invention is first placed in the bowl-shape expansion tooth the bowl little large mouth end boring end, anchor rod body is placed in to boring and pushes away the expansion tooth bowl of its bottom expansible stopper to the end of holing, by applied thrust in the pipe being enclosed within on anchor rod body, make expansible stopper that pipe orders about anchor rod body bottom truncated cone-shaped to close at the bottom of expansion tooth bowl time, pushing the teeth directional surrounding of expansion tooth bowl opens, and be pressed in borehole wall Rock And Soil, while stopping pipe applied thrust, the inner surface annular platform that the expansible stopper of anchor rod body bottom is inflated tooth bowl tooth blocks, still keep expansion tooth bowl teeth directional surrounding to open embolism among borehole wall Rock And Soil.Take out after pipe, add upper padding plate on anchor pole top, even if also anchor pole top is through the bolthole at backing plate center, and fastening nut, anchor rod body applies prestressing force to side slope Rock And Soil.
2, the present invention by injected hole on backing plate to the interior filling and injecting slurry body of holing, injecting cement paste after fixed by with the expansible stopper of anchor rod body and bottom thereof, and expansion tooth bowl is consolidated in one tightly, in the time of slope ground body deformability, by anchor rod body, side slope Rock And Soil is applied to anchored force.
3, the present invention optimizes and has improved the load pass through mechanism of ground anchorage significantly, build pulling force-pressure-embolism NEW TYPE OF COMPOSITE prestress anchoraging system, can effectively prevent that anchor pole from extracting from anchor hole together with injecting cement paste, be that anchor pole destroys together with injecting cement paste edge and the contact interface of Rock And Soil, improve significantly rock-reinforcing effect, transfer better the self-stable ability of Rock And Soil, thereby improved the safety of stability and the engineering of Rock And Soil.
4, injecting cement paste of the present invention is to being wrapped in anchor rod body wherein and the expansible stopper of bottom thereof, and expansion tooth bowl plays waterproof, anticorrosion, rust inhibition, thereby improved the durability of anchoring.
5, simple in structure, with low cost, the easy construction of the present invention.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of bottom of the present invention.
Fig. 3 is anchor rod body shaft section schematic diagram of the present invention.
Fig. 4 is anchor rod body of the present invention bottom expansible stopper schematic diagram.
Fig. 5 is anchor rod body of the present invention bottom expansible stopper shaft section schematic diagram.
Fig. 6 is expansion tooth bowl schematic diagram of the present invention.
Fig. 7 is expansion tooth bowl shaft section schematic diagram of the present invention.
In figure: 1-Rock And Soil, 2-injecting cement paste 3-boring, 4-anchor rod body 5-pad platform 6-backing plate, 7-nut, 8-top, 9-expansible stopper, 10-expansion tooth bowl, 11-tooth, 12-hole wall, 13-annular platform, 14-injected hole, 15-screw thread.
The specific embodiment
As shown in Fig. 1 ~ 7, a kind of prestressed anchor of extracting from anchor hole of preventing, it comprises anchor rod body 4, expansion tooth bowl 10 and pad platform 5, backing plate 6, the nut 7 of bottom with expansible stopper 9.On pad platform 5 and backing plate 6, be equipped with bolthole; The top 8 of anchor rod body 4 connects together with nut 7 through the bolthole of pad platform 5 and backing plate 6 successively; Expansible stopper 9 is placed in expansion tooth bowl 10.
Wherein: expansible stopper 9 is truncated cone-shaped.
The top 8 of anchor rod body 4 is provided with screw thread 15.
Expansion tooth bowl 10 is little bowl-shape in mouthful large end, and its opening upwards, is circumferentially being spacedly distributed and the tooth 11 being connected at the bottom of bowl, and the inner surface of this tooth 11 is distributed with multiple annular platforms 13, and the side of the inner surface of tooth 11 and expansible stopper 9 coincide.
On backing plate 6, have an injected hole 14.
When use, (1) by designing requirement, Rock And Soil 1 Drilling is holed to 3; (2) in the construction of 3 mouthfuls of place's pad platforms 5 of holing; the bowl-shape expansion tooth the bowl 10 little large mouth end is placed in to boring 3, and the end of bowl-shape expansion tooth bowl 10, coincided with 3 ends of boring; (4) put anchor rod body 4 in boring 3, push away its bottom truncated cone-shaped expansible stopper 9 to matching with the inner surface of boring 3 end bowl-shape expansion tooth bowls 10; pipe is enclosed within on anchor rod body 4, applied thrust is in pipe, the expansible stopper 9 that orders about anchor rod body 4 bottom truncated cone-shaped by pipe is to 10 ends of expansion tooth bowl close time, and the tooth 11 of extrusion expansion tooth bowl 10 opens to surrounding, and is pressed in the Rock And Soil 1 of boring 3 hole walls 12; stop pipe applied thrust and taken out, the expansible stopper 9 of anchor rod body 4 bottoms is blocked by the inner surface annular platform 13 of tooth 11, still keeps tooth 11 to open embolism among the Rock And Soil 1 of hole wall 12 to surrounding; add upper padding plate 6 on anchor pole top 8, even if also anchor pole top 8 is through the bolthole at backing plate 6 centers, and fastening nut 7, anchor rod body 4 applies prestressing force to side slope Rock And Soil 1; by injected hole 14 on backing plate 6 to the 3 interior filling and injecting slurry bodies 1 of holing, injecting cement paste 2 after fixed by with the expansible stopper 9 of anchor rod body 4 and bottom thereof, and expansion tooth bowl 10 is consolidated in one tightly, in the time that slope ground body 1 is out of shape, by anchor rod body 4, side slope Rock And Soil 1 is applied to anchored force.

Claims (5)

1. prevent a prestressed anchor of extracting from anchor hole, it is characterized in that: it comprises anchor rod body (4), expansion tooth bowl (10) and pad platform (5), backing plate (6), the nut (7) of bottom with expansible stopper (9); On described pad platform (5) and described backing plate (6), be equipped with bolthole; The top (8) of described anchor rod body (4) connects together with described nut (7) through the bolthole of described pad platform (5) and described backing plate (6) successively; Described expansible stopper (9) is placed in described expansion tooth bowl (10).
2. a kind of prestressed anchor of extracting from anchor hole of preventing as claimed in claim 1, is characterized in that: described expansible stopper (9) is truncated cone-shaped.
3. a kind of prestressed anchor of extracting from anchor hole of preventing as claimed in claim 1, is characterized in that: the top (8) of described anchor rod body (4) is provided with screw thread (15).
4. a kind of prestressed anchor of extracting from anchor hole of preventing as claimed in claim 1, it is characterized in that: described expansion tooth bowl (10) is little bowl-shape in mouthful large end, its opening upwards, circumferentially be spacedly distributed and the tooth being connected at the bottom of bowl (11), the inner surface of this tooth (11) is distributed with multiple annular platforms (13), and the side of the inner surface of described tooth (11) and described expansible stopper (9) coincide.
5. a kind of prestressed anchor of extracting from anchor hole of preventing as claimed in claim 1, is characterized in that: on described backing plate (6), have an injected hole (14).
CN201210412808.1A 2012-10-26 2012-10-26 A kind of prestressed anchor preventing extracting from anchor hole Expired - Fee Related CN103774648B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210412808.1A CN103774648B (en) 2012-10-26 2012-10-26 A kind of prestressed anchor preventing extracting from anchor hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210412808.1A CN103774648B (en) 2012-10-26 2012-10-26 A kind of prestressed anchor preventing extracting from anchor hole

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CN103774648A true CN103774648A (en) 2014-05-07
CN103774648B CN103774648B (en) 2015-12-02

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974997A (en) * 1986-06-26 1990-12-04 Secure Anchoring & Foundation Equipment, Inc. Hydraulic setting tool for installing anchoring and foundation support apparatus
CN1737270A (en) * 2005-07-08 2006-02-22 吴德兴 Shell expand anchorage head and anchor bar
EP2423432A2 (en) * 2010-08-25 2012-02-29 Amir Peled Anchoring apparatus and method of use
CN202936791U (en) * 2012-10-26 2013-05-15 兰州大学 Pre-stressed anchor rod prevented from being pulled out of anchor eye

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974997A (en) * 1986-06-26 1990-12-04 Secure Anchoring & Foundation Equipment, Inc. Hydraulic setting tool for installing anchoring and foundation support apparatus
CN1737270A (en) * 2005-07-08 2006-02-22 吴德兴 Shell expand anchorage head and anchor bar
EP2423432A2 (en) * 2010-08-25 2012-02-29 Amir Peled Anchoring apparatus and method of use
CN202936791U (en) * 2012-10-26 2013-05-15 兰州大学 Pre-stressed anchor rod prevented from being pulled out of anchor eye

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