WO2021082839A1

WO2021082839A1 - Npr anchor rod

Info

Publication number: WO2021082839A1
Application number: PCT/CN2020/117971
Authority: WO
Inventors: 何满潮; 夏敏; 郭洪燕; 李洪超
Original assignee: 何满潮; 夏敏
Priority date: 2019-10-31
Filing date: 2020-09-27
Publication date: 2021-05-06
Also published as: EP3954862A1; JP7274669B2; EP3954862B1; CN211038693U; US20220228487A1; JP2022549922A; EP3954862A4

Abstract

Disclosed is an NPR anchor rod, the NPR anchor rod comprising a rod body (1), a tray (2), and a lockset (3), wherein the rod body (1) is of an NPR spiral steel bar, multiple protruding spiral ribs are arranged on an outer surface of the NPR spiral steel bar, the spiral rib is of a spiral structure, and the tray (2) and the lockset (3) are directly arranged at a tail part of the NPR spiral steel bar in a sleeved manner. The NPR anchor rod can effectively solve the problems in the prior art of a common anchor rod being low in terms of elongation and being unable to meet the requirement of large deformation of surrounding rocks.

Description

NPR bolt

Technical field

The utility model relates to the technical field of concrete-related new materials, in particular to an NPR anchor rod.

Background technique

In the prior art, in the support of coal mine roadways and tunnels, bolts are the most widely used and most used support equipment. With the continuous deepening of coal mining depth, the surrounding rock of the roadway often shows the characteristics of the defense, such as: large deformation of soft rock, large deformation of rockburst, large deformation of impact, large deformation of gas outburst. Among the current supporting bolts, the elongation of the bolt body is low, which cannot adapt to the nonlinear large deformation and failure characteristics of the surrounding rock of the deep roadway. Under the action of impact load, it reaches its yield strength instantaneously and the bolt fails to break and loses load-bearing protection. Capacity, resulting in multiple repairs of the roadway, distortion and deformation of the steel frame, and cracking of the poured concrete.

Utility model content

The embodiment of the utility model provides an NPR bolt to solve the problem that the ordinary bolt in the prior art has low elongation and cannot meet the needs of large deformation of the surrounding rock.

In order to achieve the above objective, the present invention provides an NPR anchor rod, including a rod body, a tray, and a lock. The rod body is an NPR spiral steel bar. The outer surface of the NPR spiral steel bar is provided with a plurality of convex spiral ribs. The spiral rib has a spiral structure; the tray and the lock are directly sleeved on the tail of the NPR spiral steel bar.

Further, the tail of the NPR spiral steel bar is not processed.

Further, the yield strength of the NPR spiral steel bar is 800-950MPa, the tensile strength is 900-1050MPa, and the deformation displacement of the NPR spiral steel bar is 200mm-350mm/m.

Further, the nominal diameter of the NPR bolt is 14mm-26mm.

Further, the tray is a metal butterfly tray.

Further, the lock set includes a metal lock piece and a lock sleeve that cooperate with each other.

Further, the spiral ribs extend along the axial direction of the NPR spiral reinforcement.

Further, the number of the spiral ribs is 3-6.

Further, a plurality of the spiral ribs are evenly distributed along the circumferential direction of the NPR spiral reinforcement.

The NPR bolt of the present invention can achieve uniform extension (200mm-350mm/m) when large deformation of the surrounding rock of the roadway occurs, and maintain a basically stable working resistance. Therefore, the NPR bolt of the present invention can pass transverse resistance and large deformation To absorb the energy of the surrounding rock, so as to still have a good supporting effect under the condition of large deformation of the surrounding rock to ensure the stability of the roadway.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of the NPR anchor rod of the embodiment of the present invention;

Fig. 2 is a schematic diagram of the stress-strain curve of the NPR anchor rod of the embodiment of the present invention.

Detailed ways

The following describes the utility model in further detail with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the utility model.

Referring to Figures 1 and 2, according to an embodiment of the present invention, an NPR anchor rod with constant resistance and large deformation is provided. The NPR anchor rod includes a rod body 1, a tray 2 and a lock 3, and the rod body 1 is an NPR spiral steel bar. The outer surface of the steel bar is provided with a plurality of raised spiral ribs, and the spiral ribs have a spiral structure; the tray 2 and the lock 3 are directly sleeved on the tail of the NPR spiral steel bar.

Preferably, the tail of the NPR spiral steel bar is not treated. For example, the tail of the NPR spiral steel bar is not treated with thread rolling, etc. The advantage of this structure is: avoiding the stress concentration of the tail thread, thereby avoiding the situation of thread breakage at the tail, and effectively improving the elongation of the anchor rod.

In combination with the stress-strain curve diagram shown in FIG. 2, in this embodiment, the yield strength of the NPR spiral steel bar is 800-950MPa, the tensile strength is 900-1050MPa, and the deformation displacement of the NPR spiral steel bar is 200mm-350mm/m. Maximum rod force>210KN, elongation>20%, rod anchoring force>200KN, anchoring length>1m, anchor lock bearing capacity>210KN, pallet bearing capacity>210KN.

Preferably, the nominal diameter of the NPR bolt is 14mm-26mm. As shown in Figure 1, the tray 2 is a metal butterfly tray. The lock 3 includes a metal lock piece and a lock sleeve that cooperate with each other. The middle part of the tray 2 is provided with a hole for the rod 1 to pass through. The metal lock piece is sleeved on the tail of the rod body and combined with the lock sleeve to form a lock 3.

The structure of the rod body 1 is as follows: the spiral ribs extend along the axial direction of the NPR spiral reinforcement. The number of spiral ribs is 3-6. A number of spiral ribs are evenly distributed along the circumferential direction of the NPR spiral reinforcement.

The NPR bolt of the utility model can realize constant resistance and large deformation, and in the roadway where the NPR bolt of the utility model is used as a supporting device, when the surrounding rock of the roadway is deformed, the NPR bolt is uniformly stretched and the surrounding rock The deformation can be released, and while the large deformation is stretched, relatively stable working resistance has been maintained, the stability of the roadway has been realized, and the safety hazards such as roof fall and collapse have been eliminated.

It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, works, devices, components, and/or combinations thereof.

It should be noted that the terms "first" and "second" in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein.

Of course, the above are the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the basic principles of the utility model, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

An NPR anchor rod, comprising a rod body (1), a tray (2) and a lock (3), characterized in that:

The rod body (1) is an NPR spiral steel bar, and the outer surface of the NPR spiral steel bar is provided with a plurality of convex spiral ribs, and the spiral ribs have a spiral structure;

The tray (2) and the lock (3) are directly sleeved on the tail of the NPR spiral steel bar.
The NPR bolt according to claim 1, wherein the tail part of the NPR spiral steel bar is not treated.
The NPR bolt according to claim 1, wherein the yield strength of the NPR spiral steel bar is 800-950MPa, the tensile strength is 900-1050MPa, and the deformation displacement of the NPR spiral steel bar is 200mm-350mm/m.
The NPR bolt according to claim 1, wherein the nominal diameter of the NPR bolt is 14mm-26mm.
The NPR anchor rod according to claim 1, wherein the tray (2) is a metal butterfly tray.
The NPR anchor rod according to claim 1, wherein the lock (3) includes a metal lock piece and a lock sleeve that cooperate with each other.
The NPR anchor rod according to claim 1, wherein the spiral rib extends along the axial direction of the NPR spiral reinforcement.
The NPR bolt according to claim 1, wherein the number of the spiral ribs is 3-6.
The NPR anchor rod according to claim 1, wherein a plurality of the spiral ribs are evenly distributed along the circumferential direction of the NPR spiral reinforcement.