CN102777197A - Overall cementation type anchor rod with tensioning pull rod - Google Patents
Overall cementation type anchor rod with tensioning pull rod Download PDFInfo
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- CN102777197A CN102777197A CN2012102988793A CN201210298879A CN102777197A CN 102777197 A CN102777197 A CN 102777197A CN 2012102988793 A CN2012102988793 A CN 2012102988793A CN 201210298879 A CN201210298879 A CN 201210298879A CN 102777197 A CN102777197 A CN 102777197A
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- anchor rod
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- tensioning
- anchoring
- pull bar
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Abstract
The invention relates to an overall cementation type anchor rod with a tensioning pull rod, which comprises a left anchor rod and a right anchor rod which are used in pairs. The overall cementation type anchor rod is characterized in that the left anchor rod and the right anchor rod are respectively formed by a tensioning section and an anchoring section, wherein the tensioning section and the anchoring section of each of the left anchor rod and the right anchor rod are symmetrically connected in an acute angle way, the tensioning pull rod is arranged between the tensioning sections of the left anchor rod and the right anchor rod and is a bidirectional nipple thread sleeve, forward external threads and reverse external threads are respectively arranged at the ends of the tensioning sections of the left anchor rod and the right anchor rod, forward internal threads and reverse internal threads are respectively processed at the left end and the right end in the bidirectional nipple thread sleeve, and the forward external threads and the reverse external threads of the tensioning sections of the left anchor rod and the right anchor rod are rotationally connected with the forward internal threads and the reverse internal threads in the bidirectional nipple thread sleeve. The overall cementation type anchor rod has the advantages that because a transverse tensioning pull rod is arranged between the tensioning sections of the anchor rods, when a rock mass is anchored, the bearing effect of a rock-concrete structure system is improved, so that the function that stress can be commonly applied on the rock mass which is anchored is fulfilled, and the anchoring effect is good.
Description
Technical field
The present invention relates to a kind of rock mass engineering project surrounding rock supporting anchor pole that is used for, be particularly useful for comprehensive adhesive rock bolt of the band tensioning pull bar of mine, tunnel, the heavily stressed breaking surrounding rock of underground construction.
Background technology
Anchor pole is a kind of inner rod-like structure part of rock mass that is anchored at.Can be divided into three major types generally according to the principle of anchoring is different with mode:
1, mechanical anchor type: be mainly types such as slot-and-wedge type anchoring, bloated shell type anchoring and head plastic bonding anchoring.The body of rod of the anchor pole of this anchoring type does not contact with country rock;
2, hand over felted: the general paired use of this anchor pole comprehensively; At first bore the normal bolting hole; Perfusion mortar in the bolthole then, mortar pressure make the part slurries with certain diffusion radius along geotechnical body joint fissure or hole infiltration diffusion, favorably situated bolthole is apart from making the slip casting range of scatter overlapped; Form netted adhesive bond, it has certain effect for the ragstone anchoring of reinforcing the top layer detrition very much;
3, machinery and expansion mating type: utilize self expanding of anchor pole material and opening anchor rod anchored in rock mass of wedging method.
A large amount of engineering practices show that under the different geological condition, special under bad geological conditions, the anchoring ability of adhesive rock bolt will be superior to the mechanical anchor type comprehensively.Though adhesive rock bolt has certain superiority comprehensively; But; The major defect of adhesive rock bolt existence is comprehensively: because anchor pole is a straight-bar; Can not apply certain prestressing force in advance by the geologic structure face in country rock and the country rock initiatively, but utilize adhesion stress between cement mortar, reinforcing bar and the country rock to stop the distortion of country rock or move, anchoring effect depends on self intensity and and the size of the adhesion stress on country rock surface of anchor pole, cement mortar.Therefore, adhesive rock bolt still belongs to the anchoring of " passive type " comprehensively, can not fill and transfer the next anchoring effect that further strengthens anchor pole of the frictional force between the geologic structure face in country rock and the country rock.
Summary of the invention
Of the present invention is simple in structure, can improve the strength and stiffness of country rock effectively, comprehensive adhesive rock bolt of the effective band tensioning pull bar of bolt anchorage.
The objective of the invention is to realize through following technical proposals:
The comprehensive adhesive rock bolt that has the tensioning pull bar of the present invention; Comprise paired use about two anchor poles; It is characterized in that described about two anchor poles form by tension section and anchoring section respectively; The tension section of two anchor poles is that the acute angle symmetry is connected with anchoring section about described; Be provided with the lateral tension pull bar between the tension section of two anchor poles about described, described lateral tension pull bar is two-way to the silk swivel nut, and the end of two anchor pole tension section has forward and reverse external screw thread about described; Two-way right ends in the silk swivel nut is processed with forward and reverse internal thread respectively described, described about forward and reverse external screw thread of two anchor pole tension section with two-way forward and reverse internal thread in the silk swivel nut is spun mutually.
The connection angle α of described tension section and anchoring section is 80 °～75 °.
Described bolt diameter is 20mm～25mm, and the degree of depth of anchoring section is 1.5～3m, and the length of tension section is 1.5～2.0m.
The invention has the beneficial effects as follows:
Because anchor pole of the present invention adopts two anchor poles of being made up of tension section and anchoring section, and adopted lateral tension pull bar and two-way to the silk screw bushing structure in tension section.The anchoring section of two anchor poles is inserted in the boring; Regulate two anchor pole tension section and the two-way elasticity that the silk swivel nut is spun, anchor rod anchored intersegmental distance is well matched with pitch-row, at this moment the structural plane transmission certain normal pressure of the pulling force of anchor pole tension section in rock mass and rock mass; Thereby make and form a press belt in the rock mass; Transferred the frictional force between rock mass or the structural plane, realized country rock or geologic structure face are applied prestressed effect, and then improved the effect of bolt anchorage; Changed original the sort of main dependence anchor pole self and come the passive anchor type of anchoring, transferred the mechanics effect of rock mass and structural plane self on one's own initiative with mortar strength.Particularly under the unfavorable geological condition of geologic structure surface development in the country rock, the effect of anchoring can significantly improve.
Description of drawings
Fig. 1 is the comprehensive adhesive rock bolt structural representation that has the tensioning pull bar of the present invention.
Fig. 2 is the comprehensive adhesive rock bolt lateral tension pull bar partial enlarged drawing that has the tensioning pull bar of invention.
The specific embodiment
Below in conjunction with the description of drawings specific embodiment of the present invention.
Like Fig. 1, shown in Figure 2; The comprehensive adhesive rock bolt that has the tensioning pull bar of the present invention; Comprise paired use about two anchor poles; It is characterized in that described about two anchor poles forms by tension section 4 and anchoring section 5 respectively, described about the tension section 4 of two anchor poles to be that acute angle is symmetrical with anchoring section 5 be connected, be provided with the lateral tension pull bar between the tension section 4 of two anchor poles about described; Described lateral tension pull bar is two-way to silk swivel nut 1; The end of two anchor pole tension section has forward and reverse external screw thread 3 about described, two-way right ends in the silk swivel nut is processed with forward and reverse internal thread 2 respectively described, described about forward and reverse external screw thread of two anchor pole tension section 4 with two-way forward and reverse internal thread 2 in the silk swivel nut 1 is spun mutually.
6 is direction shown in the tensile force among the figure, and 7 is rock mass discontinuity.
At first bore bolthole, when boring bolthole, two bore boltholes certain angle beta that will tilt to the inside; Generally be controlled within 10 °～15 °, so that construction, perfusion mortar in the bolthole then; Mortar pressure makes the part slurries spread along geotechnical body joint fissure or hole infiltration with certain diffusion radius, and favorably situated bolthole forms netted adhesive bond apart from making the slip casting range of scatter overlapped; Thereby improve the strength and stiffness of geotechnical body greatly, i.e. the compressive strength of geotechnical body, angle of internal friction; Cohesive force is greatly improved, and the anchor pole arrangement pitch should guarantee within the twice of slip casting diffusion radius, thereby guarantee desirable consolidation effect; Anchorage mortar adopts the Portland cement mortar, and proportioning is a Portland cement, middle fine sand; Part by weight is 1:1～1:1.2, and water/binder ratio is controlled between 0.38～0.4.
During anchoring, require prior boundary in anchoring section 5 and tension section 4 that anchor pole is processed into less than 90 ° of degree acute angles according to reinforcing usually, this angle helps in rock mass, producing normal pressure.In inserting the anchor pole process, the lateral tension pull bar 4 of the tension section of left and right two anchor poles is spun to silk swivel nut 1 with two-way, tentatively adjust the spacing of two anchor poles according to the distance of adjacent two borings; Anchor rod anchored section 5 spacing well matched with pitch-row.After treating that cementitious materials solidifies, with spanner (or pipe wrench) left and right sides tension section 4 and lateral tension pull bar 1 are screwed, the tension section of its anchor pole must satisfy two conditions of wanting:
σ≤σ P With
ε≤ε P ,Be in the stage of elastic deformation with the tension section that guarantees anchor pole
:
The definite of strain value ε can do two gauge points on anchor pole, available dial gauge (or slide measure) is measured the stretcher strain value of anchor pole before and after the lateral tension pull bar is screwed and calculated
ε=（L
2
-?L
1
）/?L
1
L
1---distance between two marks when not revolving the lateral tension pull bar.
L
2---distance between two marks when screwing the lateral tension pull bar.
Tensile stress in the anchor pole
σCan calculate through the stretcher strain of control tension section:
σ=
E?*ε
The final pulling force that in the anchor pole tension section, produces
NCan calculate according to formula 3:
N=π R 2 * σ RRadius for anchor pole.
The screw degree of lateral tension pull bar of spanner is fixed at the construction rower that advance, and according to the situation that reality is demarcated, basically the lateral tension pull bar being screwed with spanner generally speaking gets final product.Anchor pole exposes the certain pulling force of generation in the tension section like this; Through the structural plane transmission certain normal pressure of pulling force in rock mass and rock mass of anchor pole tension section, form a press belt in the rock mass thereby make, transferred the frictional force between rock mass or the structural plane; Realization applies prestressed effect to country rock or geologic structure face; And then improved the effect of bolt anchorage, and changed original the sort of main dependence anchor pole self and come the passive anchor type of anchoring with mortar strength, transferred the mechanics effect of rock mass and structural plane self on one's own initiative; Improve the load-bearing effect of " rock-concrete structural system ", played the common stressed effect of grappling rock mass.
Claims (3)
1. comprehensive adhesive rock bolt with the tensioning pull bar; Comprise paired use about two anchor poles; It is characterized in that described about two anchor poles form by tension section and anchoring section respectively; The tension section of two anchor poles is that the acute angle symmetry is connected with anchoring section about described; Be provided with the tensioning pull bar between the tension section of two anchor poles about described, described tensioning pull bar is two-way to the silk swivel nut, and the end of two anchor pole tension section has forward and reverse external screw thread about described; Two-way right ends in the silk swivel nut is processed with forward and reverse internal thread respectively described, described about forward and reverse external screw thread of two anchor pole tension section with two-way forward and reverse internal thread in the silk swivel nut is spun mutually.
2. comprehensive adhesive rock bolt of band tensioning pull bar according to claim 1, the connection angle α that it is characterized in that described tension section and anchoring section are 80 °～75 °.
3. comprehensive adhesive rock bolt of band tensioning pull bar according to claim 1 is characterized in that described bolt diameter is 20mm～25mm, and the degree of depth of anchoring section is 1.5～3m, and the length of tension section is 1.5～2.0m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102988793A CN102777197A (en) | 2012-08-22 | 2012-08-22 | Overall cementation type anchor rod with tensioning pull rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102988793A CN102777197A (en) | 2012-08-22 | 2012-08-22 | Overall cementation type anchor rod with tensioning pull rod |
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| Publication Number | Publication Date |
|---|---|
| CN102777197A true CN102777197A (en) | 2012-11-14 |
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ID=47122286
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102988793A Pending CN102777197A (en) | 2012-08-22 | 2012-08-22 | Overall cementation type anchor rod with tensioning pull rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106884651A (en) * | 2017-03-07 | 2017-06-23 | 中国矿业大学 | A kind of slopes wall concrete bottom board prestress loading device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596496A (en) * | 1983-09-29 | 1986-06-24 | The Eastern Co. | Mine roof supporting truss system |
| SU1601384A1 (en) * | 1988-02-19 | 1990-10-23 | Институт горного дела Севера Якутского филиала СО АН СССР | Lock-less roof bolt |
| CN2069482U (en) * | 1990-04-18 | 1991-01-16 | 中国矿业大学 | Supporting frame of anchor truss |
| CN2095938U (en) * | 1991-05-11 | 1992-02-12 | 中国矿业大学 | Double-rod anchor pulling support |
| CN2179462Y (en) * | 1993-12-25 | 1994-10-12 | 中国矿业大学 | Anchor-drawing support |
| CN202914111U (en) * | 2012-08-22 | 2013-05-01 | 鞍钢集团矿业公司 | Comprehensive cementation type anchor rod with tension rod |
-
2012
- 2012-08-22 CN CN2012102988793A patent/CN102777197A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596496A (en) * | 1983-09-29 | 1986-06-24 | The Eastern Co. | Mine roof supporting truss system |
| SU1601384A1 (en) * | 1988-02-19 | 1990-10-23 | Институт горного дела Севера Якутского филиала СО АН СССР | Lock-less roof bolt |
| CN2069482U (en) * | 1990-04-18 | 1991-01-16 | 中国矿业大学 | Supporting frame of anchor truss |
| CN2095938U (en) * | 1991-05-11 | 1992-02-12 | 中国矿业大学 | Double-rod anchor pulling support |
| CN2179462Y (en) * | 1993-12-25 | 1994-10-12 | 中国矿业大学 | Anchor-drawing support |
| CN202914111U (en) * | 2012-08-22 | 2013-05-01 | 鞍钢集团矿业公司 | Comprehensive cementation type anchor rod with tension rod |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106884651A (en) * | 2017-03-07 | 2017-06-23 | 中国矿业大学 | A kind of slopes wall concrete bottom board prestress loading device |
| WO2018161649A1 (en) * | 2017-03-07 | 2018-09-13 | 中国矿业大学 | Inclined shaft well wall concrete floor prestress loading apparatus |
| AU2017402485B2 (en) * | 2017-03-07 | 2019-12-12 | China University Of Mining And Technology | Apparatus for prestressing Concrete Floor of Inclined Shaft Wall |
| US10612241B2 (en) | 2017-03-07 | 2020-04-07 | China University Of Mining And Technology | Apparatus for prestressing concrete floor of inclined shaft wall |
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Application publication date: 20121114 |