CN2653130Y - New structure prestress anchor - Google Patents
New structure prestress anchor Download PDFInfo
- Publication number
- CN2653130Y CN2653130Y CN 03221080 CN03221080U CN2653130Y CN 2653130 Y CN2653130 Y CN 2653130Y CN 03221080 CN03221080 CN 03221080 CN 03221080 U CN03221080 U CN 03221080U CN 2653130 Y CN2653130 Y CN 2653130Y
- Authority
- CN
- China
- Prior art keywords
- anchor rod
- anchor pole
- novel structure
- cylinder
- longer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Piles And Underground Anchors (AREA)
Abstract
The utility model relates to a laneway supporting anchor rod, particularly a prestressing anchor rod with a novel structure. The prestressing anchor rod with a novel structure adopts a twisted shape steel bar bundle which is made by twisting four steel bars, wherein the diameter d of the steel bars is longer than eight mm, the helix angle alpha is thirty to seventy DEG, and the screw pitch s is five to twelve d; the length L of the anchor rod is longer than 1500 mm; one end of the anchor rod is forged into a solid cylinder; M2d screw threads are arranged on the cylinder; the length of the screw threads is longer than 80 mm; the spiral direction of the steel bar bundle of the anchor rod is reverse to the spiral direction of the screw threads on the solid body end of the anchor rod. Shear stress on every point on the cross section of the utility model is relatively uniform under the condition of complex stress, so that shearing preventing ability can be improved by about 20 percent, bending preventing ability can be improved by about 20 percent, and the cohesion area between a rod body and a cement cartridge can be enlarged to enhance supporting stability at the same time.
Description
Affiliated technical field
The utility model relates to a kind of tunnel supporting anchor rod, particularly a kind of novel structure prestressed anchor pole.
Background technology
Mine working, highway and railway tunnel and subway adopt the bolt support mode usually in work progress, promptly in the boring around tunnel, tunnel a series of support anchors are set, join other support member again and form support system, rely on the interaction force between anchor pole and the country rock to keep the stable of rock mass, to guarantee normally carrying out and keeping the safety in production of construction.Tunnel, constructing tunnel adopt cylindric bolt support mostly at present, the major technique defective of this anchor pole is: anchor pole is under the stressing conditions of complexity, especially under action of lateral load, the each point unbalanced stress is even on the cross section, therefore its anti-shearing and resistant to bending ability is relatively poor, form lateral shear easily and destroy and bending failure, thereby cause the roadway support repair rate higher, can cause the generation of roof fall and great personnel casualty accidents when serious.In order to improve the anti-shear ability of anchor pole, people take to increase the way of bolt diameter usually, can cause increasing substantially of support cost but do like this.
Summary of the invention
The purpose of this utility model provides a kind of novel structure prestressed anchor pole, has overcome more weak poor, the technological deficiency that material usage is big of the anti-shearing bending resistance of existing anchor pole.
The technical scheme that its technical problem that solves the utility model adopts is:
The utility model adopts 4 reinforcing bars to twist into the twisted shape tendon, the diameter d of described reinforcing bar is more than the 8mm, pitch angle alpha will is 30 °-70 °, pitch S is 5-12d, the length L of described anchor pole is more than the 1500mm, one end of anchor pole forges into real cylinder, and cylinder is provided with the screw thread of M2d, reach L
0More than 80mm, the described anchor pole tendon hand of spiral is opposite with the hand of spiral of anchor pole entity end screw thread.
Preferably: the length L of anchor pole is 1800-2200mm, and d is 10mm, the reach L on the cylinder
0Be 100mm.
The beneficial effects of the utility model are:
The utility model is compared with the cylindrical anchor pole of equal cross-sectional area, owing to adopt twisted shape tendon structure, the one, its axial tension compressive strength is almost equal, but having under the action of lateral load situation, the stress of each point is even relatively on its cross section, thereby improve anti-shear ability about 20%, improve counter-bending ability about 20%, be particularly suitable for the bigger roadway support of stress flatly; The 2nd, increased the bonded area of the body of rod and cement-roll, improved the stability of supporting.The utility model is by changing anchor structure, and under the situation of equivalent material consumption, cost significantly reduces.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is a cross-sectional structure schematic diagram of the present utility model.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further specified:
4 diameters reinforcing bar 1 that is 10mm is placed on left-handed on the torsion device (clockwise direction) to be reversed, twist and make twisted shape reinforcing bar pencil anchor pole 2, its pitch angle alpha will is 50 °, pitch S is 65mm, the length L of anchor pole 2 is 2000mm, one end of anchor pole 2 is forged into real cylinder 3, and cylinder 3 is provided with dextrorotation (counterclockwise) M20 screw thread, reach L
0Be 100mm, see Fig. 1, Fig. 2.
Claims (3)
1, novel structure prestressed anchor pole, it is characterized in that it is the twisted shape tendon that is twisted into by 4 reinforcing bars, the diameter d of described reinforcing bar is more than the 8mm, pitch angle alpha will is 30 °-70 °, pitch S is 5-12d, and the length L of described anchor pole is more than the 1500mm, and an end of anchor pole is real cylinder, cylinder is provided with the screw thread of M2d, reach L
0More than 80mm.
2, novel structure prestressed according to claim 1 anchor pole is characterized in that the described anchor pole tendon hand of spiral is opposite with the hand of spiral of anchor pole entity cylindrical end screw thread.
3, as novel structure prestressed anchor pole as described in claim 1 or the claim 2, it is characterized in that the length L of described anchor pole is 1800-2200mm, the end reach L on the cylinder
0Be 100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03221080 CN2653130Y (en) | 2003-04-08 | 2003-04-08 | New structure prestress anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03221080 CN2653130Y (en) | 2003-04-08 | 2003-04-08 | New structure prestress anchor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2653130Y true CN2653130Y (en) | 2004-11-03 |
Family
ID=34325894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03221080 Expired - Fee Related CN2653130Y (en) | 2003-04-08 | 2003-04-08 | New structure prestress anchor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2653130Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108049903A (en) * | 2018-02-06 | 2018-05-18 | 安徽理工大学 | Shearing resistance-large deformation tension and compression combination fried dough twist type anchor pole |
-
2003
- 2003-04-08 CN CN 03221080 patent/CN2653130Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108049903A (en) * | 2018-02-06 | 2018-05-18 | 安徽理工大学 | Shearing resistance-large deformation tension and compression combination fried dough twist type anchor pole |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |