CN111894643A - Constant-resistance body and constant-resistance sleeve assembly and NPR anchor rod/cable - Google Patents
Constant-resistance body and constant-resistance sleeve assembly and NPR anchor rod/cable Download PDFInfo
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- CN111894643A CN111894643A CN202010761717.3A CN202010761717A CN111894643A CN 111894643 A CN111894643 A CN 111894643A CN 202010761717 A CN202010761717 A CN 202010761717A CN 111894643 A CN111894643 A CN 111894643A
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- constant
- resistance
- resistance body
- diameter end
- sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/004—Bolts held in the borehole by friction all along their length, without additional fixing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/006—Anchoring-bolts made of cables or wires
Abstract
The invention provides a constant-resistance body, a constant-resistance sleeve assembly and an NPR anchor rod/cable. Constant resistance body and constant resistance sleeve subassembly includes: the constant-resistance body is in a circular truncated cone shape and is provided with a large-diameter end and a small-diameter end; the constant-resistance sleeve is internally provided with the constant-resistance body; the radial size of the large-diameter end of the constant resistor is larger than the inner diameter of the constant-resistance sleeve, and the radial size of the small-diameter end of the constant resistor is smaller than the inner diameter of the constant-resistance sleeve; the edge of the end face of the large-diameter end of the constant resistance body is provided with a groove. In the stage of sliding, the scrap iron originally generated and accumulated at the front end of the constant resistance body can be discharged gradually in the forward sliding process of the constant resistance body through the groove, and can not be accumulated at the front end of the constant resistance body any more, so that the sliding motion of the constant resistance body is hindered, the constancy of the constant resistance value in the NPR anchor rod/cable working process is ensured, and the important practical significance is realized on the deformation control of the engineering rock mass.
Description
Technical Field
The invention relates to the technical field of NPR anchor rods/cables, in particular to a constant-resistance body and constant-resistance sleeve assembly and an NPR anchor rod/cable.
Background
In order to meet the requirements of efficient and safe mining of deep parts and high and large side slopes of strip mines, particularly to meet the requirements of control and prediction of disasters such as high-stress rock burst, landslide, large deformation of soft rock and the like, an NPR anchor cable/rod with high energy absorption, high constant resistance and negative poisson ratio is developed in the prior art.
The NPR anchor cable/rod is a general term of NPR series products, and common NPR anchor cables/rods include NPR anchor cables and NPR anchors, and the NPR anchors are taken as an example for description: as shown in fig. 1 and 3, the NPR anchor rod includes a constant-resistance sleeve 2, a cone 7, a rod body, a tray and a fastening nut, the constant-resistance sleeve 2 is a hollow cylindrical structure, the cone 7 is in a truncated cone shape and is installed in a cavity in the constant-resistance sleeve 2, the radial size of the small end of the cone 7 is slightly smaller than the inner diameter of the constant-resistance sleeve 2, and the radial size of the large end of the cone 7 is slightly larger than the inner diameter of the constant-resistance sleeve 2. One end of the rod body is fixed with the cone 7, and the other end extends out of the constant-resistance sleeve 2 to form an anchoring end. The end of the constant-resistance sleeve 2, which is far away from the anchoring end, is provided with a tray and a fastening nut, and the end of the constant-resistance sleeve 2, which is provided with the tray and the fastening nut, forms a free end. The difference between the structure of the NPR anchor cable and the NPR anchor rod is that: in NPR anchors, the body (the reinforcing steel) which is fixedly connected to the cone 7 and forms the anchoring end. In the NPR cable, fixedly connected to the cone 7 and forming an anchoring end is a cable body (steel strand).
As shown in fig. 1 and 2, when an outward axial load (tension) is applied to the free end of the constant resistance sleeve 2, the tension does not exceed the constant resistance P of the NPR bolt0(P0Equal to the ultimate static friction force of the cone 7 sliding in the casing), the cone 7 does not slide, and the supporting work effect of the cone 7 is shown in fig. 1 and 2. When the tension exceeds the constant resistance (also called constant resistance) P of the NPR anchor rod0The constant resistance sleeve 2 will then produce a displacement in the opposite direction to the anchor section, which is the deformation of the NPR bolt. Wherein, P0Equal to the ultimate static friction, P, of the cone 7 sliding inside the sleeve0Designed to be 80-90% of the yield strength of the corresponding rod body material or the corresponding steelThe breaking force value of the stranded wire is 80-90%, so that the rod body is not subjected to obvious plastic deformation or the steel stranded wire is not broken when the constant-resistance body slides in the constant-resistance sleeve, and the reliable work of the NPR anchor cable/rod is ensured. The movement of the constant-resistance sleeve 2 is equivalent to the slippage of the cone 7 relative to the inner wall of the sleeve, and when the cone 7 slips in the constant-resistance sleeve 2, the constant-resistance sleeve 2 generates radial expansion deformation, so that an NPR (negative Poisson ratio) structural effect is generated. In the sliding process of the cone 7 in the constant-resistance sleeve 2, in order to prevent the cone 7 from generating friction damage due to low strength, causing resistance reduction phenomenon and seriously influencing the constant-resistance performance of the NPR anchor rod/cable, the elastic modulus of the constant-resistance sleeve 2 is usually far lower than that of the cone 7. However, as shown in fig. 3 and 4, in the use of the actual engineering, it is found that, because the strength of the cone 7 is relatively high, the inner wall of the constant-resistance sleeve 2 is cut by friction and scrap iron 6 is generated in the sliding stage, the scrap iron 6 is accumulated in front of the movement direction of the cone 7 and blocks the movement of the cone 7, so that the constant resistance is increased, and when the constant resistance is increased to be greater than or equal to the yield strength of the corresponding rod material or the breaking force value of the steel strand, the corresponding rod may undergo significant plastic deformation or break of the corresponding steel strand, so that the NPR anchor/cable itself fails and is damaged.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a constant-resistance body, a constant-resistance sleeve assembly and an NPR anchor rod/cable, and aims to solve the problem that the NPR anchor rod/cable is damaged due to failure caused by the increase of a constant-resistance value in the conventional NPR anchor rod/cable.
In order to achieve the above purpose, the invention provides the following technical scheme:
constant resistance body and constant resistance sleeve subassembly includes:
the constant-resistance body is in a circular truncated cone shape and is provided with a large-diameter end and a small-diameter end;
the constant-resistance sleeve is internally provided with the constant-resistance body;
the radial size of the large-diameter end of the constant resistor is larger than the inner diameter of the constant-resistance sleeve, and the radial size of the small-diameter end of the constant resistor is smaller than the inner diameter of the constant-resistance sleeve;
the edge of the end face of the large-diameter end of the constant resistance body is provided with a groove.
Further, the groove extends along the axial direction of the constant resistance body and penetrates through the constant resistance body.
Further, along the direction of big footpath end to path end, the degree of depth of recess reduces gradually.
Furthermore, the number of the grooves is at least two, and the grooves are uniformly distributed along the circumferential direction of the constant resistance body;
preferably, the number of the grooves is three.
An NPR bolt/cable comprising:
the constant-resistance body is in a circular truncated cone shape and is provided with a large-diameter end and a small-diameter end, a groove is formed in the edge of the end face of the large-diameter end of the constant-resistance body, and a mounting hole is formed in the end face of the large-diameter end and penetrates through the constant-resistance body;
the constant-resistance sleeve is internally provided with the constant-resistance body;
the radial size of the large-diameter end of the constant resistor is larger than the inner diameter of the constant-resistance sleeve, and the radial size of the small-diameter end of the constant resistor is smaller than the inner diameter of the constant-resistance sleeve;
the rod body or the cable body penetrates through the mounting hole and is fixed on the constant resistance body through the clamping piece.
Further, the groove extends along the axial direction of the constant resistance body and penetrates through the constant resistance body.
Further, the depth of the groove gradually increases and decreases along the direction from the small-diameter end to the large-diameter end.
Further, the number of the grooves is at least two, and the grooves are arranged along the circumferential direction of the constant resistance body.
Further, the number of the grooves is three;
the number of the mounting holes is six, and the mounting holes are uniformly distributed along the circumferential direction of the constant resistance body.
Further, the mounting hole is provided with a shaft passing diameter passing through the axis of the constant resistor, and the extension line of the shaft passing diameter passes through the groove.
Compared with the closest prior art, the technical scheme of the constant-resistance body, the constant-resistance sleeve assembly and the NPR anchor rod/cable has the following excellent effects:
1) through the grooving, under the prerequisite that can not influence constant resistance, reduced the iron fillings that partly produce because of the friction cutting.
2) The strength of the original constant-resistance body is not changed, structural failure caused by the change of the strength of the constant-resistance body cannot occur, and the groove cannot cause adverse effects on the working effect of the constant-resistance body.
3) In the stage of sliding, the scrap iron originally generated and accumulated at the front end of the constant resistance body can be discharged gradually in the forward sliding process of the constant resistance body through the groove, and can not be accumulated at the front end of the constant resistance body any more, so that the sliding motion of the constant resistance body is hindered, the constancy of the constant resistance value in the NPR anchor rod/cable working process is ensured, and the important practical significance is realized on the deformation control of the engineering rock mass.
4) The stability of the constant resistance value in the working state of the constant resistance body is ensured, and the safety of a supporting system is ensured.
Drawings
FIG. 1 is a partial schematic structural view of a NPR anchor rod/cable in the prior art when relative slippage between a constant resistance sleeve and a constant resistance body does not occur;
FIG. 2 is a line graph of the change of the constant resistance value of the NPR anchor rod/cable with time when the relative slippage between the constant resistance sleeve and the constant resistance body does not occur in the prior art;
FIG. 3 is a partial schematic structural view of a NPR anchor rod/cable after relative sliding movement between a constant resistance sleeve and a constant resistance body in the prior art;
FIG. 4 is a line graph of constant resistance over time for a prior art NPR anchor/cable;
FIG. 5 is a perspective view from three dimensions of the NPR anchor/cable of the present invention;
fig. 6 is a right side view of the constant resistance body of fig. 5;
FIG. 7 is a cross-sectional view A-A of FIG. 6;
FIG. 8 is a partial schematic structural view of the NPR anchor/cable of the present invention during relative sliding movement between the constant resistance sleeve and the constant resistance body;
fig. 9 is a line graph of constant resistance over time for an NPR anchor/cable of the present invention.
In the figure: 1. a pre-stressed anchor cable; 2. a constant resistance bushing; 3. a constant resistance body; 31. a groove; 32. mounting holes; 321. a circular table portion; 4. a tray; 5. fastening a nut; 6. scrap iron; 7. a cone.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
the invention takes the NPR anchor cable as an example, and the concrete structure of the NPR anchor cable is simply explained as follows: as shown in fig. 5, the NPR anchor cable includes a constant resistance sleeve 2, a constant resistance body 3, a prestressed anchor cable 1, a tray 4 and a fastening nut 5, wherein the constant resistance sleeve 2 and the constant resistance body 3 form a constant resistance body and constant resistance sleeve assembly. As shown in fig. 6, the constant-resistance sleeve 2 has a hollow cylindrical structure, and the constant-resistance body 3 has a truncated cone shape and is installed in a cavity inside the constant-resistance sleeve 2. The constant resistance body 3 is made of high-strength carbon steel, and the radial size of the small-diameter end of the constant resistance body 3 is slightly smaller than the inner diameter of the constant resistance sleeve 2, so that the constant resistance body 3 can be conveniently installed. The radial dimension of the large-diameter end of the constant-resistance body 3 is slightly larger than the inner diameter of the constant-resistance sleeve 2 to realize the NPR effect. The constant resistance body 3 is provided with a plurality of mounting holes 32, the mounting holes 32 penetrate through the constant resistance body 3 along the axial direction of the constant resistance body 3, the part of each mounting hole 32 close to the large-diameter end is a circular table part 321 (forming an expanding section), and the circular table part 321 is used for mounting clamping pieces, so that the prestressed anchor cable 1 can be conveniently mounted and fixed. In this embodiment, the number of the mounting holes 32 is six, and the six mounting holes 32 are uniformly arranged along the circumferential direction of the constant resistance body 3. In other embodiments, the number of mounting holes 32 may be adjusted according to different needs of experiment and field engineering. The mounting hole 32 has an over-axis diameter that passes through the axis of the constant resistance body, and in this embodiment, an extension of the over-axis diameter passes through the groove 31. In other embodiments, the groove can be located between the diameter of the through shaft of the two corresponding adjacent mounting holes to avoid the position of the groove and the mounting hole from being too close to each other, so that the overall strength of the constant-resistance body is further ensured, the phenomenon that the constant resistance is reduced or even reduced due to the plastic deformation of the constant-resistance body is avoided, and the stability of the constant resistance and the ideal elastic-plastic characteristic of the NPR anchor rod/cable constant-resistance large-deformation are further ensured.
The terminal surface edge of the big footpath end of the constant resistance body 3 is equipped with recess 31, and recess 31 has threely, and three recess 31 is along the circumference evenly distributed of the constant resistance body 3 (recess 31 sets up the side at the constant resistance body 3 promptly), and recess 31 extends and link up the constant resistance body 3 along the axial of the constant resistance body 3, and recess 31 has the function that holds of iron fillings 6 and supplies the function that iron fillings 6 removed concurrently. Along the direction of footpath end to big footpath end, the degree of depth of recess 31 increases gradually to prevent iron fillings to block up in the recess, with better discharging iron fillings. The depth of the groove 31 is according to the requirement of chip removal, and the strength of the constant resistance body 3 is considered, the groove depth of the groove 31 is smaller than the radial dimension of the constant resistance body 3, and the influence on the working performance of the constant resistance body 3 caused by the groove 31 is avoided. In other embodiments, the depth of the groove 31 is the same throughout. The number of the grooves 31 can also be selected from one, two, four, etc. according to the actual use situation.
In other embodiments, the groove depth may be equal throughout the groove.
One end of the prestressed anchor cable 1 passes through the mounting hole 32 on the constant resistance body 3 and is locked and fixed by using a clip, and the other end extends out of the constant resistance sleeve 2 and forms an anchoring end.
The end of the constant-resistance sleeve 2 far away from the anchoring end is provided with a tray 4 and a fastening nut 5, and the end of the constant-resistance sleeve 2 provided with the tray 4 and the fastening nut 5 forms a free end.
In engineering application, when engineering geotechnics supported by NPR anchor rod/cable installation are disturbed by external factors (load, blasting, excavation, earthquake and the like), and the stability of the whole surrounding rock is reduced and slowly deforms, the NPR anchor rod/cable only generates certain elastic deformation (specifically, the prestressed anchor cable 1 generates certain elastic deformation) under the action of external load/surrounding rock pressure, the constant resistance body 3 does not slide, and the supporting working effect of the constant resistance body 3 is the same as that of the constant resistance body 3 in the prior art.
When engineering rock is damaged by large deformation, huge deformation energy originally stored in the engineering rock begins to be released outwards, and when external load/surrounding rock pressure is larger than a constant resistance value design value of an NPR anchor rod/cable (limit static friction force of a constant resistance body 3 sliding in a sleeve), the constant resistance body 3 begins to slide in a constant resistance sleeve 2 by friction, and through the friction sliding of the constant resistance body 3, the NPR anchor rod/cable generates axial large deformation (namely the constant resistance sleeve 2 generates displacement opposite to an anchoring section), a part of deformation of the engineering rock is counteracted, the sliding process of the constant resistance sleeve 2 is a working process, and the process can absorb the deformation energy released by the engineering rock so as to achieve the purpose of effectively controlling the deformation of the engineering rock to maintain the stability of the engineering rock.
As shown in fig. 8 and 9, in the friction sliding stage, the constant resistance body 3 performs friction cutting on the inner wall of the constant resistance sleeve 2, so that iron filings 6 are gradually generated and accumulated in front of the movement direction of the constant resistance body 3, the iron filings 6 obstruct the movement of the constant resistance body 3, the constant resistance value is gradually increased, the support effect of the NPR anchor rod/cable is affected, and the failure of the support system may be caused. As shown in fig. 6 and 7; according to the invention, the groove 31 is formed in the constant resistance body 3, as shown in fig. 8, the groove 31 has the function of accommodating the scrap iron 6 and the function of moving the scrap iron 6, so that the scrap iron 6 inevitably generated by friction sliding can not be accumulated in front of the constant resistance body 3 because of incapability of being cleaned, and the constant resistance value is prevented from being increased continuously. As shown in fig. 9, during the forward sliding movement of the constant resistance body 3, the iron filings 6 will be gradually transferred to the rear of the constant resistance body 3 or into the groove 31 through the groove 31 on the constant resistance body 3, and then the iron filings 6 are removed, so as to ensure the constant resistance value in the NPR anchor rod/cable operation.
In other embodiments, the groove 31 may not penetrate through the constant resistance body 3, and at this time, the groove 31 only has a function of accommodating the iron pieces 6, does not have a function of discharging the iron pieces 6, and is suitable for the case where the sliding distance of the constant resistance sleeve 2 is not long.
The specific embodiment of the constant-resistance body and constant-resistance sleeve assembly of the invention is the same as the structure of the constant-resistance body and constant-resistance sleeve assembly in the above-mentioned specific embodiment of the NPR anchor rod/cable, and the details are not repeated.
In summary, the invention adopts the constant-resistance body, the constant-resistance sleeve assembly and the NPR anchor rod/cable, and compared with the prior art, the invention has the following technical effects:
1) through setting up the recess, under the prerequisite that can not influence constant resistance, reduced the iron fillings that partly produce because of friction cutting.
2) The strength of the original constant-resistance body is not changed, structural failure caused by the change of the strength of the constant-resistance body cannot occur, and the groove cannot cause adverse effects on the working effect of the constant-resistance body.
3) In the sliding stage, the scrap iron originally accumulated at the front end of the constant resistance body can be gradually discharged through the groove in the forward sliding process of the constant resistance body, can not be accumulated at the front end of the constant resistance body any more, so that the sliding motion of the constant resistance body is avoided being hindered, the constancy of the constant resistance value in the NPR anchor rod/cable working process is ensured, and the important practical significance is realized on the deformation control of the engineering rock mass.
4) The stability of the constant resistance value in the working state of the constant resistance body is ensured, and the safety of a supporting system is ensured.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Constant resistance body and constant resistance sleeve subassembly, its characterized in that: the method comprises the following steps:
the constant-resistance body is in a circular truncated cone shape and is provided with a large-diameter end and a small-diameter end;
the constant-resistance sleeve is internally provided with the constant-resistance body;
the radial size of the large-diameter end of the constant resistor is larger than the inner diameter of the constant-resistance sleeve, and the radial size of the small-diameter end of the constant resistor is smaller than the inner diameter of the constant-resistance sleeve;
the edge of the end face of the large-diameter end of the constant resistance body is provided with a groove.
2. The constant resistance body and constant resistance sleeve assembly of claim 1, wherein: the groove extends along the axial direction of the constant resistance body and penetrates through the constant resistance body.
3. The constant resistance body and constant resistance sleeve assembly of claim 2, wherein: the depth of the groove gradually decreases in the direction from the large-diameter end to the small-diameter end.
4. The constant resistance body and constant resistance sleeve assembly of claim 1, wherein:
the number of the grooves is at least two, and the grooves are uniformly distributed along the circumferential direction of the constant-resistance body;
preferably, the number of the grooves is three.
NPR anchor/rope, characterized by: the method comprises the following steps:
the constant-resistance body is in a circular truncated cone shape and is provided with a large-diameter end and a small-diameter end, a groove is formed in the edge of the end face of the large-diameter end of the constant-resistance body, and a mounting hole is formed in the end face of the large-diameter end and penetrates through the constant-resistance body;
the constant-resistance sleeve is internally provided with the constant-resistance body;
the radial size of the large-diameter end of the constant resistor is larger than the inner diameter of the constant-resistance sleeve, and the radial size of the small-diameter end of the constant resistor is smaller than the inner diameter of the constant-resistance sleeve;
the rod body or the cable body penetrates through the mounting hole and is fixed on the constant resistance body through the clamping piece.
6. The NPR bolt/cable of claim 5, wherein: the groove extends along the axial direction of the constant resistance body and penetrates through the constant resistance body.
7. The NPR bolt/cable of claim 6, wherein: the depth of the groove gradually increases in the direction from the small diameter end to the large diameter end.
8. The NPR bolt/cable of claim 5, wherein: the number of the grooves is at least two, and the grooves are distributed along the circumferential direction of the constant resistance body.
9. The NPR bolt/cable of claim 8, wherein:
the number of the grooves is three;
the number of the mounting holes is six, and the mounting holes are uniformly distributed along the circumferential direction of the constant resistance body.
10. The NPR bolt/cable of claim 9, wherein: the mounting hole is provided with a shaft passing diameter passing through the axis of the constant resistance body, and the extension line of the shaft passing diameter passes through the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761717.3A CN111894643A (en) | 2020-07-31 | 2020-07-31 | Constant-resistance body and constant-resistance sleeve assembly and NPR anchor rod/cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010761717.3A CN111894643A (en) | 2020-07-31 | 2020-07-31 | Constant-resistance body and constant-resistance sleeve assembly and NPR anchor rod/cable |
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| CN111894643A true CN111894643A (en) | 2020-11-06 |
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| CN202010761717.3A Pending CN111894643A (en) | 2020-07-31 | 2020-07-31 | Constant-resistance body and constant-resistance sleeve assembly and NPR anchor rod/cable |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459137A (en) * | 2020-11-16 | 2021-03-09 | 中国矿业大学(北京) | NPR anchor rod monitoring and control system and method for rocky slope collapse disaster |
| CN112983470A (en) * | 2021-05-11 | 2021-06-18 | 北京中矿创新联盟能源环境科学研究院 | TBM (Tunnel boring machine) supporting system and method for soft rock tunnel |
| CN114182840A (en) * | 2021-11-11 | 2022-03-15 | 中国矿业大学(北京) | Large-deformation anchoring device suitable for building structure earthquake-resistant node |
| CN114183180A (en) * | 2021-12-17 | 2022-03-15 | 辽宁有色勘察研究院有限责任公司 | Down-placing tool and down-placing method for deep hole cross-fault Newton force NPR anchor cable |
| CN114215174A (en) * | 2021-11-11 | 2022-03-22 | 中国矿业大学(北京) | Constant-resistance large-deformation anchoring device suitable for building structure earthquake-resistant node |
| CN115182765A (en) * | 2022-09-14 | 2022-10-14 | 北京中矿创新联盟能源环境科学研究院 | Slip casting NPR anchor cable |
| US11771183B2 (en) | 2021-12-16 | 2023-10-03 | Joon Bu Park | Negative Poisson's ratio materials for fasteners |
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2020
- 2020-07-31 CN CN202010761717.3A patent/CN111894643A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459137A (en) * | 2020-11-16 | 2021-03-09 | 中国矿业大学(北京) | NPR anchor rod monitoring and control system and method for rocky slope collapse disaster |
| CN112983470A (en) * | 2021-05-11 | 2021-06-18 | 北京中矿创新联盟能源环境科学研究院 | TBM (Tunnel boring machine) supporting system and method for soft rock tunnel |
| CN114182840A (en) * | 2021-11-11 | 2022-03-15 | 中国矿业大学(北京) | Large-deformation anchoring device suitable for building structure earthquake-resistant node |
| CN114215174A (en) * | 2021-11-11 | 2022-03-22 | 中国矿业大学(北京) | Constant-resistance large-deformation anchoring device suitable for building structure earthquake-resistant node |
| US11771183B2 (en) | 2021-12-16 | 2023-10-03 | Joon Bu Park | Negative Poisson's ratio materials for fasteners |
| CN114183180A (en) * | 2021-12-17 | 2022-03-15 | 辽宁有色勘察研究院有限责任公司 | Down-placing tool and down-placing method for deep hole cross-fault Newton force NPR anchor cable |
| CN115182765A (en) * | 2022-09-14 | 2022-10-14 | 北京中矿创新联盟能源环境科学研究院 | Slip casting NPR anchor cable |
| WO2023142654A1 (en) * | 2022-09-14 | 2023-08-03 | 中国矿业大学(北京) | Large-deformation and constant-resistance support grouting anchor cable |
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