CN111254956A - Dangerous rock mass prestress bolt-anchor reinforcing structure and method for realizing reinforcing structure - Google Patents
Dangerous rock mass prestress bolt-anchor reinforcing structure and method for realizing reinforcing structure Download PDFInfo
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- CN111254956A CN111254956A CN202010302304.9A CN202010302304A CN111254956A CN 111254956 A CN111254956 A CN 111254956A CN 202010302304 A CN202010302304 A CN 202010302304A CN 111254956 A CN111254956 A CN 111254956A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims abstract description 28
- 239000011083 cement mortar Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 105
- 239000010959 steel Substances 0.000 claims description 105
- 238000005553 drilling Methods 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 19
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- 238000012544 monitoring process Methods 0.000 claims description 11
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- 230000002787 reinforcement Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000007569 slipcasting Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 4
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Abstract
The invention discloses a dangerous rock mass prestressed bolt anchor reinforcing structure, which comprises a main rigid rod body and an auxiliary rigid rod body, wherein the main rigid rod body and the auxiliary rigid rod body are respectively and coaxially poured in drill holes on mother rock and dangerous rock mass by cement mortar, the main rigid rod body is one, the auxiliary rigid rod bodies are two or more, the upper ends of the main rigid rod body and the auxiliary rigid rod bodies are respectively exposed out of the ground, and the auxiliary rigid rod bodies are connected with the upper ends of the main rigid rod bodies by prestressed anchor cables; the reinforcing structure forms a many-to-one distribution mode, so that the dangerous rock mass is strongly anchored at multiple points and multiple directions, and the structure can generate a strong anchoring effect; the invention also discloses a method for realizing the dangerous rock mass prestress bolt anchor reinforcing structure.
Description
Technical Field
The invention relates to a dangerous rock mass prestressed bolt-anchor reinforcing structure, and further relates to a method for realizing the dangerous rock mass prestressed bolt-anchor reinforcing structure, belonging to the technical field of dangerous rock mass prevention and control engineering anchoring.
Background
The definition of the dangerous rock mass refers to a rock mass which is located on a cliff or a steep slope and is cut by a rock mass structural plane and has poor stability, and the dangerous rock mass is a global pervasive mountain geological disaster and has the characteristics of universality, concealment, outburst, disaster causing, destructiveness and the like. The collapse and instability mechanism of the dangerous rock mass is explained by using a fracture mechanics viewpoint, the critical rock mass formed by cutting of the joint cracks is subjected to continuous fracture and expansion of tip cracks of structural surfaces such as the joint cracks and the bedding surface under the long-term action of gravity and external force, and finally the dangerous rock mass is caused to collapse in a stable manner, wherein a plurality of structural surfaces for controlling the collapse of the critical rock mass such as the joint cracks and the bedding surface are summarized into a main control structural surface, and the stability coefficient of the critical rock mass of the structural surface is minimum.
At present, the most widely applied method in the dangerous rock mass prevention and control project is a prestressed anchor cable anchoring technology, the prestressed anchor cable can better play a role in high-strength anchoring, has a relatively obvious crack-resistant toughening effect, effectively blocks crack propagation of a main control structural plane of dangerous rocks, and strengthens the stability of the dangerous rocks. However, in the existing dangerous rock mass pre-stressed anchor cable anchoring technology, an external penetration dangerous rock mass pre-stressed anchoring mode is adopted, namely, a mechanical drilling hole penetrates through a dangerous rock mass from the outer surface of a dangerous rock mass and extends into a stable mother rock, and then a dangerous rock mass body and the mother rock are tightly pulled into a whole by installing the pre-stressed anchor solid in the drilling hole. It can be seen that this technique has the disadvantages: firstly, the adaptability problem of prestressed anchoring applied to a cliff or a steep slope in dangerous rock mass prevention and control engineering is solved, and great economic and technical difficulties are brought; secondly, the disturbance problem of the prestressed anchoring construction to the dangerous rock mass brings higher construction safety risk. Therefore, a new dangerous rock mass pre-stressed anchoring technology needs to be designed to improve the technical level of dangerous rock mass pre-stressed anchoring prevention and control.
Disclosure of Invention
In view of the above, one of the purposes of the present invention is to provide a dangerous rock mass prestressed bolt-anchor reinforcing structure, which has the advantages of simple structure, low treatment cost, low technical difficulty, small implementation safety risk, strong anchoring capability, significant treatment effect, real-time monitoring and early warning, etc., and is suitable for a region with a slow slope of the terrain above the dangerous rock mass.
One of the purposes of the invention is realized by the following technical scheme:
the main rigid rod body and the auxiliary rigid rod body are respectively and coaxially poured in drill holes in mother rocks and dangerous rocks by cement mortar, the upper ends of the main rigid rod body and the auxiliary rigid rod body are respectively exposed out of the ground, and the upper ends of the auxiliary rigid rod bodies are connected by prestressed anchor cables.
Furthermore, the lower parts of the ground of the main rigid rod body and the auxiliary rigid rod body are steel pipes, and a plurality of flower hole through holes are uniformly arranged on the surfaces of the steel pipes at intervals.
Further, the part above the ground of the main rigid rod body and the auxiliary rigid rod body is respectively formed by solid round steel and a solid base in coaxial connection, the base is in a cone frustum shape, the bottom surface of the base is tightly attached to the ground, the top end of the steel pipe is in coaxial connection with the bottom surface of the base, and the base is provided with a grouting hole communicated with an inner hole of the steel pipe.
Furthermore, the round steel of the main rigid rod body and the auxiliary rigid rod body are respectively provided with a penetrating hole in the radial direction, the prestressed anchor cable comprises a pier head clamp, a pier head anchorage device and a steel strand, one end of the steel strand penetrates through the penetrating hole in the auxiliary rigid rod body and is bolted and fixed by the pier head clamp, the other end of the steel strand penetrates through the penetrating hole in the main rigid rod body and is bolted and fixed by the pier head anchorage device, and the steel strand is the steel strand applied with prestress.
Furthermore, a protection tube is sleeved on the steel strand.
Furthermore, a stress sensor is sleeved on the steel strand between the pier head anchorage device and the main rigid rod body, a data transmission instrument electrically connected with the stress sensor is arranged on the position, close to the drilling hole opening, above the mother rock, and the data transmission instrument is connected with the monitoring information management center host through a transmission network.
Still further, be equipped with laser displacement sensor on the round steel of the main rigid rod body, laser displacement sensor aims at the reflector panel of fixed on the vice rigid rod body, laser displacement sensor is connected with the data transmission appearance electricity.
The second purpose of the invention is realized by the following technical scheme:
a method for realizing a dangerous rock mass prestress bolt anchor reinforcing structure comprises the following steps:
a, drilling holes: firstly, drilling holes in mother rocks and dangerous rock masses respectively by using a drilling machine, wherein one hole is drilled in the mother rocks, two or more holes are drilled in the dangerous rock masses, and then the holes in the drilled holes are cleaned;
b, mounting a main rigid rod body and an auxiliary rigid rod body: firstly, coaxially placing a main rigid rod body and an auxiliary rigid rod body in the drill holes of mother rocks and dangerous rocks respectively, wherein the upper ends of the main rigid rod body and the auxiliary rigid rod body extend out of the ground respectively, and then pouring cement mortar into each drill hole until the position of a drill hole opening is poured;
c, mounting a prestressed anchor cable: after the cement mortar is solidified, the upper ends of the auxiliary rigid rod bodies and the main rigid rod body are connected by using prestressed anchor cables.
And in the step b, the parts, below the ground, of the main rigid rod body and the auxiliary rigid rod body are steel pipes, a plurality of flower hole through holes are uniformly arranged on the surfaces of the steel pipes at intervals, and cement mortar penetrates through the flower hole through holes to be poured into the inner holes of the whole steel pipes and drill holes.
Furthermore, the part above the ground of the main rigid rod body and the auxiliary rigid rod body is respectively formed by coaxially connecting solid round steel and a solid base, the base is in a cone frustum shape, the bottom surface of the base is tightly attached to the ground, the top end of the steel pipe is coaxially connected to the bottom surface of the base, the base is provided with a grouting hole communicated with the inner hole of the steel pipe, a grouting guide pipe extends into the bottom of the inner hole of the steel pipe from the grouting hole, cement mortar is poured into the steel pipe through a grouting pipe, and the cement mortar penetrates through the flower eye through hole and is poured into the whole drilling hole and the inner hole of the steel pipe.
Further, in the step b, a grouting guide pipe extends into the bottom of the inner hole of the steel pipe from the grouting hole, cement mortar is poured into the steel pipe through the grouting guide pipe, and the cement mortar penetrates through the flower hole through hole and is poured into the whole drill hole and the inner hole of the steel pipe.
Further, in step c: prestress is applied to the steel strand by the anchor jack.
The invention has the beneficial effects that:
the dangerous rock mass prestress bolt-anchor reinforcing structure is characterized in that a main rigid rod body and a plurality of auxiliary rigid rod bodies are respectively arranged on mother rocks and dangerous rocks, the upper ends of the auxiliary rigid rod bodies are connected with the upper end of the main rigid rod body by prestress anchor cables to form a multi-to-one distribution mode, so that the dangerous rock mass is subjected to strong anchoring effects of multiple points and multiple directions.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a pre-stressed bolting and anchoring structure for a dangerous rock mass according to the invention.
Fig. 2 is a cross-sectional view of a pre-stressed bolting and anchoring structure for a dangerous rock mass.
Fig. 3 is a structural view of the main rigid rod body or the auxiliary rigid rod body in fig. 1.
Fig. 4 is a schematic view illustrating a state where the prestressed anchor rope of fig. 1 is coupled to the main rigid rod body.
Fig. 5 is a schematic view of the arrangement of the drill holes in fig. 1 on mother rocks and a dangerous rock mass.
Fig. 6 is a schematic structural view of the primary rigid rod body and the secondary rigid rod body poured with cement mortar in fig. 1.
FIG. 7 is a schematic view of the connection between the stress sensor and the prestressed anchorage cable in FIG. 1.
Fig. 8 is a schematic view of prestressing a steel strand according to the present invention.
Fig. 9 is a schematic diagram of the present invention for monitoring the stress on the steel strand and for monitoring the displacement of the secondary rigid rod.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
As shown in fig. 1-9, a pre-stressed bolting and anchoring structure for dangerous rock mass, which is suitable for a terrain with a gentle slope above the dangerous rock mass, comprises a main rigid rod body and an auxiliary rigid rod body, wherein the main rigid rod body and the auxiliary rigid rod body are respectively and coaxially poured in a drilling hole 5 on mother rock 15 and a dangerous rock mass 13 by cement mortar 4, the size of the main rigid rod body is larger than that of the auxiliary rigid rod body, and the size of a corresponding drilling hole on the mother rock 15 is larger than that of a drilling hole on the dangerous rock mass 13, so that the structure is more stable, the bolting and anchoring effect is better, the size of the auxiliary rigid rod body and the size of the drilling hole on the dangerous rock mass are much smaller than that of an anchor rod and the drilling hole in the traditional pre-stressed anchor cable anchoring, therefore, the needed treatment cost is lower, the technical difficulty is lower, the disturbance to the dangerous rock mass is smaller, the drilling hole is not the traditional drilling hole penetrating through the dangerous rock mass and extending into the stable mother, therefore, the construction on the dangerous rock mass is safer, the central lines of the drilling holes on the preferable mother rock and the drilling holes on the dangerous rock mass are parallel to each other, the main rigid rod body is one, the auxiliary rigid rod bodies are two or more, the upper ends of the main rigid rod body and the auxiliary rigid rod bodies are respectively exposed out of the ground, the auxiliary rigid rod bodies and the upper ends of the main rigid rod bodies are connected through the prestressed anchor cables, the prestressed anchor cables are in a horizontal state, and the structure forms a multi-to-one distribution mode, so that the dangerous rock mass 15 is subjected to multi-point and multi-direction strong anchoring effect.
The reinforcing structure restrains the dangerous rock mass from deforming towards the direction of the cliff or the free face of the steep slope on one hand, and changes the stress state of the dangerous rock mass and the mother rock on the other hand, so that the main control structure face between the dangerous rock mass and the mother rock is in a stressed state, the tensile stress is reduced, and the crack expansion of the dangerous rock mass is limited.
The ground of the main rigid rod body and the auxiliary rigid rod body is divided into a steel pipe 3 at the lower part, a plurality of flower hole through holes 301 are uniformly arranged on the surface of the steel pipe 3 at intervals, the wall of the steel pipe 3 is thick, cement mortar 4 penetrates through the flower hole through holes 301 and is poured in the whole steel pipe 3, inner holes and drill holes 5, the main rigid rod body is connected with a mother rock 15 more firmly, and the auxiliary rigid rod body is connected with a dangerous rock body 13 more firmly.
The part above the ground of the main rigidity body of rod and the vice rigidity body of rod is formed by solid round steel 1 and solid base 2 coaxial coupling respectively, base 2 is the frustum of a cone type, 2 bottom surfaces of base hug closely ground, 3 top coaxial coupling of steel pipe are on 2 bottom surfaces of base, be equipped with the slip casting hole 102 that is linked together with 3 holes in the steel pipe on the base 2, a slip casting pipe stretches into 3 hole bottoms in the steel pipe from the slip casting hole, pour cement mortar 4 into steel pipe 3 through the slip casting pipe, cement mortar 4 passes and pours whole drilling 5 and 3 holes in the steel pipe from flower eye through-hole 301, the material of base is the steel also, round steel 1, base 2 and 3 integrated into one piece in the steel pipe, base 2 has the effect of transmission and dispersion, because the base bottom surface is big, the atress contact surface is big, can avoid appearing drilling drill way.
The steel bar 1 of the main rigid rod body and the auxiliary rigid rod body is respectively provided with a penetrating hole 101 in the radial direction, the prestressed anchor rope comprises a pier head clamp 8, a pier head anchorage device 9 and a steel strand 6, one end of the steel strand 6 penetrates through the penetrating hole 101 in the auxiliary rigid rod body and is bolted and fixed by the pier head clamp 8, the other end of the steel strand 6 penetrates through the penetrating hole 101 in the main rigid rod body and is bolted and fixed by the pier head anchorage device 9, the steel strand 6 is a prestressed steel strand, the steel strand 6, the pier head clamp 8 and the pier head anchorage device 9 are in a barbell shape in appearance, and the prestressed anchor rope has strong anchoring force and can restrain deformation, exerts the high-strength anchoring effect of the prestressed anchor rope by exerting prestress on the steel strand 6, and limits the tension crack of the main control structure surface to continue to expand.
The steel strand 6 is sleeved with a protection tube 7, and the protection tube 7 has an anti-rust effect.
The steel strand 6 adopts the low-relaxation steel strand of high strength on the market, and steel strand 6 comprises a plurality of bundles of steel strand units, and a bundle of steel strand units is processed by a plurality of high strength steel wires and is twisted into, and the classification, specification, intensity, bundle number, length etc. that the steel strand 6 used are confirmed according to actual conditions, and protection tube 7 adopts the plastic tubing that the composite material made on the market, utilizes it to embolia parcel steel strand 6.
The stress sensor 10 is sleeved on the steel strand 6 between the pier head anchorage device 9 and the main rigid rod body, a data transmission instrument 12 electrically connected with the stress sensor 10 is arranged on the ground above the mother rock 15 and close to the orifice position of the drill hole 5, the data transmission instrument 12 is connected with a monitoring information management center host through a transmission network, the stress sensor 10 acquires stress data on the steel strand 6, and the bolt anchor reinforcement effect can be obtained through analysis according to the data so as to give an early warning.
Be equipped with laser displacement sensor 11 on the round steel 1 of the main rigidity body of rod, laser displacement sensor 11 aims at the reflector panel of fixing on the vice rigidity body of rod, and laser displacement sensor 11 is connected with data transmission appearance 12 electricity, and laser displacement sensor gathers the displacement data of the vice rigidity body of rod, can draw the 14 circumstances of splitting deformation of master control structural plane according to this data analysis, and then reachs dangerous rock mass deflection and deformation rate to make the early warning.
The dangerous rock mass is tightly constrained on the stable mother rock, the stability of the dangerous rock mass is improved, the deformation of the dangerous rock mass is effectively limited, and a real-time monitoring system consisting of the stress sensor, the laser displacement sensor and the data transmission instrument is matched to realize the dangerous rock mass prestress bolt-anchor reinforcing structure capable of being monitored in real time.
A method for realizing a dangerous rock mass prestress bolt anchor reinforcing structure comprises the following steps:
a, drilling holes: firstly, drilling 5 holes in mother rocks 15 and dangerous rocks 13 respectively by using a drilling machine, drilling one hole in the mother rocks 15, drilling two or more holes in the dangerous rocks 13, and then cleaning the holes in the drilled holes 5;
b, mounting a main rigid rod body and an auxiliary rigid rod body: firstly, coaxially placing a main rigid rod body and an auxiliary rigid rod body in the drill holes 5 of the parent rock 15 and the dangerous rock body 13 respectively, wherein the upper ends of the main rigid rod body and the auxiliary rigid rod body extend out of the ground respectively, then pouring cement mortar 4 into each drill hole 5 until the position of an orifice of the drill hole 5 is poured, and forming a steel concrete structure by the cement mortar 4 and the steel pipe 3 and firmly bonding the steel concrete structure on the wall of the drill hole of the dangerous rock body 13 or the parent rock 15;
c, mounting a prestressed anchor cable: after cement mortar is solidified, each pair of rigid rod bodies is connected with the upper end of the main rigid rod body by adopting a prestressed anchor cable, the prestressed anchor cable has stress which enables the prestressed anchor cable to generate a contraction trend, so that the dangerous rock body 13 and the stable mother rock 15 can be subjected to opposite anchoring force, the deformation of the dangerous rock body 13 towards the direction of the scarp or the steep slope free face is restrained, the tension crack of the main control structure face 14 of the dangerous rock body 13 is limited to continue expanding, the good restraining deformation and high-strength anchoring effect of the prestressed anchor cable are exerted, the stability of the dangerous rock body 13 is improved, the prestress is applied to the steel strand 6 by using a pump 17 and a jack 16, the jack 16 is connected with the pump 17, and the telescopic end of the jack 16 is connected with the steel strand 6.
In the step b, the lower parts of the ground of the main rigid rod body and the auxiliary rigid rod body are the steel pipes 3, a plurality of flower hole through holes 301 are uniformly arranged on the surfaces of the steel pipes at intervals, and cement mortar 4 penetrates through the flower hole through holes 301 and is poured to fill the inner holes of the whole steel pipes 3 and the drill holes 5.
The part above the ground of the main rigid rod body and the vice rigid rod body is formed by solid round steel 1 and solid base 2 coaxial coupling respectively, base 2 is the frustum of a cone type, ground is hugged closely to 2 bottom surfaces of base, 3 top coaxial coupling of steel pipe are on 2 bottom surfaces of base, be equipped with the slip casting hole 102 that is linked together with 3 holes of steel pipe on the base 2, a slip casting pipe stretches into 3 hole bottoms of steel pipe from the slip casting hole, pour cement mortar 4 in steel pipe 3 through the slip casting pipe, cement mortar 4 passes and pours whole drilling 5 and 3 holes of steel pipe from flower eye through-hole 301.
In the step c, penetrating holes 101 are respectively arranged in the radial direction of the round steel of the main rigid rod body and the auxiliary rigid rod body, the prestressed anchor rope comprises a pier head clamp 8, a pier head anchorage device 9 and a steel strand 6, one end of the steel strand 6 firstly penetrates through the penetrating holes 101 in the auxiliary rigid rod body and is fixedly bolted by the pier head clamp 8, the other end of the steel strand 6 penetrates through the penetrating holes 101 in the main rigid rod body and applies prestress to the steel strand 6, and finally the steel strand is fixedly bolted by the pier head anchorage device 9.
Before prestressing the steel strand 6, a protective tube 7 is first placed over the steel strand 6.
The stress sensor 10 is sleeved on the steel strand 6 between the pier head anchorage device 9 and the main rigid rod body, a data transmission instrument 12 electrically connected with the stress sensor 10 is arranged on the ground above the mother rock 15 and close to the orifice of the drill hole 5, the data transmission instrument 12 transmits stress data on the steel strand 6 detected by the stress sensor 10 to a monitoring information management center host through a transmission network, and the monitoring information management center analyzes the stress data on the steel strand 6 continuously in real time to obtain a bolt anchor reinforcing effect and performs forecasting and early warning.
Be equipped with laser displacement sensor 11 on the round steel 1 of the main rigid body of rod, laser displacement sensor 11 aims at the reflector panel of fixing on the vice rigid body of rod, laser displacement sensor 11 is connected with data transmission appearance 12 electricity, data transmission appearance 12 passes through transmission network and transmits the vice rigid body of rod displacement data that laser displacement sensor 11 detected for monitoring information management center host computer, monitoring information management center staff obtains the main control structural plane 14 condition of splitting deformation and forecast the early warning through carrying out the analysis to the vice rigid body of rod displacement data of real-time in succession.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a dangerous rock mass prestressing force bolt anchor reinforced structure which characterized in that: the steel pipe comprises a main rigid rod body and an auxiliary rigid rod body, wherein the main rigid rod body and the auxiliary rigid rod body are coaxially poured in a drilling hole (5) in mother rock (15) and dangerous rock (13) through cement mortar (4) respectively, the main rigid rod body is one, the auxiliary rigid rod body is two or more, the upper ends of the main rigid rod body and the auxiliary rigid rod body are exposed out of the ground respectively, and the auxiliary rigid rod body and the upper end of the main rigid rod body are connected through a prestressed anchor cable.
2. The pre-stressed bolting and anchoring reinforcement structure for dangerous rock masses according to claim 1, characterized in that: the lower parts of the ground of the main rigid rod body and the auxiliary rigid rod body are steel pipes (3), and a plurality of flower hole through holes (301) are uniformly arranged on the surfaces of the main rigid rod body and the auxiliary rigid rod body at intervals.
3. The pre-stressed bolting and anchoring structure for dangerous rock masses according to claim 2, characterized in that: the part above the ground of the main rigid rod body and the auxiliary rigid rod body is respectively formed by solid round steel (1) and solid base (2) in a coaxial connection mode, the base (2) is in a cone frustum shape, the ground is tightly attached to the bottom surface of the base (2), the top end of the steel pipe (3) is in a coaxial connection mode on the bottom surface of the base (2), and a grouting hole (102) communicated with an inner hole of the steel pipe (3) is formed in the base (2).
4. The pre-stressed bolting and anchoring structure for dangerous rock masses according to claim 3, wherein: the prestressed anchor cable is characterized in that penetrating holes (101) are radially and respectively formed in round steel (1) of the main rigid rod body and the auxiliary rigid rod body, the prestressed anchor cable comprises a pier head clamp (8), a pier head anchor (9) and a steel strand (6), one end of the steel strand (6) penetrates through the penetrating holes (101) in the auxiliary rigid rod body and is fixedly bolted by the pier head clamp (8), the other end of the steel strand (6) penetrates through the penetrating holes (101) in the main rigid rod body and is fixedly bolted by the pier head anchor (9), and the steel strand (6) is prestressed.
5. The pre-stressed bolting and anchoring structure for dangerous rock masses according to claim 4, wherein: the steel strand (6) is sleeved with a protection tube (7).
6. The pre-stressed bolting and anchoring structure for dangerous rock mass according to claim 4 or 5, wherein: the stress sensor (10) is sleeved on the steel strand (6) between the pier head anchorage device (9) and the main rigid rod body, a data transmission instrument (12) electrically connected with the stress sensor (10) is arranged at the position, close to the hole opening of the drill hole (5), on the ground above the mother rock (15), and the data transmission instrument (12) is connected with the monitoring information management center host through a transmission network.
7. The pre-stressed bolting and anchoring structure for dangerous rock masses according to claim 6, wherein: be equipped with laser displacement sensor (11) on round steel (1) of the main rigidity body of rod, laser displacement sensor (11) aim at the fixed reflector panel on the vice rigidity body of rod, laser displacement sensor (11) are connected with data transmission appearance (12) electricity.
8. A method for realizing the dangerous rock mass prestress bolt anchor reinforcing structure of any one of claims 1 to 7 is characterized in that: the method comprises the following steps:
a, drilling holes: firstly, drilling holes (5) in a mother rock (15) and a dangerous rock body (13) respectively by using a drilling machine, drilling one hole in the mother rock (15), drilling two or more holes in the dangerous rock body (13), and then cleaning the holes in the drilled holes (5);
b, mounting a main rigid rod body and an auxiliary rigid rod body: firstly, coaxially placing a main rigid rod body and an auxiliary rigid rod body in drill holes (5) of mother rocks (15) and dangerous rocks (13), respectively, wherein the upper ends of the main rigid rod body and the auxiliary rigid rod body extend out of the ground respectively, and then pouring cement mortar (4) into each drill hole (5) until the position of an orifice of the drill hole (5) is poured;
c, mounting a prestressed anchor cable: after the cement mortar is solidified, the upper ends of the auxiliary rigid rod bodies and the main rigid rod body are connected by using prestressed anchor cables.
9. The method for realizing the pre-stressed bolt-anchor reinforcing structure of the dangerous rock mass according to claim 8, is characterized in that: in the step b, a grouting guide pipe extends into the bottom of the inner hole of the steel pipe (3) from the grouting hole, cement mortar (4) is poured into the steel pipe (3) through the grouting guide pipe, and the cement mortar (4) penetrates through the flower eye through hole (301) and is poured to fill the whole drill hole (5) and the inner hole of the steel pipe (3).
10. The method for realizing the pre-stressed bolt-anchor reinforcing structure of the dangerous rock mass according to claim 8, is characterized in that: in step c: prestress is applied to the steel strand by the anchor jack.
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| CN202010302304.9A CN111254956A (en) | 2020-04-16 | 2020-04-16 | Dangerous rock mass prestress bolt-anchor reinforcing structure and method for realizing reinforcing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162399A (en) * | 2022-07-12 | 2022-10-11 | 中建海峡建设发展有限公司 | Foundation fast anchoring and attaching structure device |
| CN115354671A (en) * | 2022-07-28 | 2022-11-18 | 四川省公路规划勘察设计研究院有限公司 | A anchor structure for in situ reinforcement dangerous rock |
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| CN212052815U (en) * | 2020-04-16 | 2020-12-01 | 贵州省交通规划勘察设计研究院股份有限公司 | Dangerous rock mass prestressing force bolt anchor reinforced structure |
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| JPS59173422A (en) * | 1983-03-18 | 1984-10-01 | Kensetsu Kiso Eng Kk | Bedrock anchor |
| CN102383435A (en) * | 2011-09-28 | 2012-03-21 | 中铁大桥局股份有限公司 | High-fall levee double-row piles |
| CN102493437A (en) * | 2011-11-26 | 2012-06-13 | 山东大学 | Grouting-type micro steel pipe pile and grouting reinforcement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115162399A (en) * | 2022-07-12 | 2022-10-11 | 中建海峡建设发展有限公司 | Foundation fast anchoring and attaching structure device |
| CN115162399B (en) * | 2022-07-12 | 2023-11-10 | 中建海峡建设发展有限公司 | Quick anchoring and attaching structure device for foundation |
| CN115354671A (en) * | 2022-07-28 | 2022-11-18 | 四川省公路规划勘察设计研究院有限公司 | A anchor structure for in situ reinforcement dangerous rock |
| CN115354671B (en) * | 2022-07-28 | 2023-09-26 | 四川省公路规划勘察设计研究院有限公司 | Anchor-pulling structure for in-situ reinforcement of dangerous rock |
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