CN210264725U - Clamping rock combination reinforcing apparatus in little clear distance tunnel - Google Patents
Clamping rock combination reinforcing apparatus in little clear distance tunnel Download PDFInfo
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- CN210264725U CN210264725U CN201921211218.6U CN201921211218U CN210264725U CN 210264725 U CN210264725 U CN 210264725U CN 201921211218 U CN201921211218 U CN 201921211218U CN 210264725 U CN210264725 U CN 210264725U
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Abstract
The utility model discloses a small clear distance tunnel rock clamping combined reinforcing device, which comprises a counter-pull anchor rod, a cushion block and a steel plate; the opposite pulling anchor rod provides axial pre-stress; cushion and steel sheet make the prestressing force that provides to drawing the stock can evenly distributed on well press from both sides the rock to make well press from both sides the rock and be in three-dimensional atress state, avoid well press from both sides rock unstability. The device provides a scheme for reinforcing the middle clamping rock in the small clear distance tunnel, can effectively prevent local damage of the middle clamping rock caused by concentrated load of pre-applied force of the opposite-pulling anchor rod, and also reduces the possibility that the middle clamping rock is in a one-way stress state and is easy to destabilize.
Description
Technical Field
The utility model belongs to the technical field of the tunnel is strutted, concretely relates to press from both sides rock combination reinforcing apparatus in little clean apart from tunnel.
Background
The tunnel of the expressway and the first-level highway is designed into independent double holes with separated ascending and descending. The minimum clear distance of the separated independent double holes is based on the principle that the two hole structures are not harmful to each other. Such separate tunnels running up and down respectively may be used where conditions warrant, but certain conditions, such as difficult route separation or complex terrain conditions outside the tunnel, tight land, large removal volumes or the use of separate two-hole tunnels running up and down, make it very difficult to perform this clear distance, especially in bridge-to-tunnel connections, where small clear distance tunnels are a reasonable solution. However, the thickness of the middle sandwiched rock of the small-clear-distance tunnel is far smaller than that of a common double-hole tunnel (generally only 5-8 m), and the stress is more complicated than that of a common separated tunnel. In order to ensure that the structural form is successfully applied to highway construction, certain engineering measures are required to ensure the stability of the middle clamped rock.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a small-clear-distance tunnel rock clamping combined reinforcing device which has simple structure, convenient operation and low cost and can avoid the instability of the middle clamped rock; and the local damage of the middle clamped rock caused by the concentration of prestress of the opposite-pulling anchor rod can be effectively prevented.
The utility model adopts the technical proposal that: a combined reinforcing device for clamping rocks in a small clear distance tunnel comprises a plurality of counter-pulling anchor rods and two steel plates; the two steel plates are respectively arranged on two side surfaces of the middle clamping rock and are arranged close to the two side surfaces of the middle clamping rock; the opposite-pulling anchor rod penetrates through the middle clamping rock and the two steel plates, and the two steel plates are fixed on the two side faces of the middle clamping rock through the two ends of the opposite-pulling anchor rod through the anchorage devices.
In the small clear distance tunnel rock clamping combination reinforcing device, cushion blocks are arranged at two ends of the opposite pull anchor rod and are positioned between the anchorage device and the steel plate; the cushion block is made of a steel plate with the yield strength not less than Q235, and the thickness of the cushion block is not less than 0.5 cm.
In the small clear distance tunnel rock clamping combined reinforcing device, the counter pull anchor rod is applied with pre-applied axial force, the counter pull anchor rod is made of a material with the strength not less than HRB400, and the diameter of the counter pull anchor rod is not less than 25 mm.
In the small clear distance tunnel rock clamping combination reinforcing device, the steel plate is the steel plate with the yield strength not less than Q235, and the thickness of the steel plate is not less than 2 cm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses through exert on the split anchor pole add axial force in advance, when realizing that the steel sheet is fixed, the steel sheet makes the axial force in advance that the split anchor pole provided can evenly distribute on well clamp rock, thereby makes well clamp rock be in three-dimensional atress state, avoids well clamp rock unstability; the utility model can effectively prevent the local damage of the middle clamping rock caused by the concentration of the prestress of the opposite pulling anchor rod; the utility model discloses simple structure still has, convenient operation, advantage with low costs.
Drawings
Fig. 1 is a structural diagram of the present invention.
Fig. 2 is a view from a in fig. 1.
In the figure: 1 is middle clamped rock; 2 is a steel plate; 3 is a counter-pulling anchor rod; 4 is a cushion block; 5, a small clear distance tunnel left hole; 6 is a right hole of the small clear distance tunnel; f1, F2, …, Fn-1 and Fn are used for pre-applying axial force to the pull anchor rod; sx and Sy are horizontal and vertical intervals of opposite pulling anchor rod arrangement; z is the distance from the top of the middle clamped rock;
the vertical pressure at the top of the middle clamp rock;
the vertical pressure is the z distance from the top of the middle clamped rock; p is a radical ofzIs the horizontal average pressure at z distance from the top of the trapped rock.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, the utility model discloses a contain two steel sheets 2, a plurality of split anchor rods 3 and a plurality of cushion 4. The two steel plates 2 are respectively arranged on two side faces of the middle clamp rock 1, and the two steel plates 2 are arranged close to the two side faces of the middle clamp rock 1. The opposite-pulling anchor rod 3 penetrates through the middle clamping rock 1 and the two steel plates 2, and the two steel plates 2 are fixed on two side surfaces of the middle clamping rock 1 by the anchors at two ends 3 of the opposite-pulling anchor rod. Cushion blocks 4 are arranged at two ends of the opposite-pull anchor rod 3, and the cushion blocks 4 are positioned between the anchorage device and the steel plate 2.
The counter-pull anchor rod 3 is applied with pre-applied axial force, the counter-pull anchor rod 3 is made of a material with the strength not less than HRB400, and the diameter of the counter-pull anchor rod 3 is not less than 25 mm. The steel plate 2 is made of steel plate with yield strength not less than Q235, and the thickness of the steel plate 2 is not less than 2 cm. The cushion block 4 is made of a steel plate with the yield strength not less than Q235, and the thickness of the cushion block 4 is not less than 0.5 cm.
The utility model discloses the use as follows: fixing two steel plates 2 on two sides of the middle clamp rock 1 respectively; a hole is drilled in the middle tong rock 1 and a counter-pulling anchor rod 3 is installed. Cushion blocks 4 are arranged at two ends of the opposite-pull anchor rod 3; and then, tensioning the tension anchor rod 3 to form pre-applied axial force, wherein the pre-applied axial force is subjected to stress diffusion of the cushion block 4 and the steel plate 3, so that uniformly distributed horizontal pressure is formed, the middle clamp rock 1 is in a three-dimensional stress state, and instability of the middle clamp rock 1 can be avoided.
Claims (4)
1. The utility model provides a press from both sides rock combination reinforcing apparatus in little clear distance tunnel which characterized in that: comprises a plurality of counter-pulling anchor rods and two steel plates; the two steel plates are respectively arranged on two side surfaces of the middle clamping rock and are arranged close to the two side surfaces of the middle clamping rock; the opposite-pulling anchor rod penetrates through the middle clamping rock and the two steel plates, and the two steel plates are fixed on the two side faces of the middle clamping rock through the two ends of the opposite-pulling anchor rod through the anchorage devices.
2. The rock clamping combination reinforcing device in the small clear distance tunnel of claim 1, characterized in that: cushion blocks are arranged at two ends of the counter-pull anchor rod and are positioned between the anchorage device and the steel plate; the cushion block is made of a steel plate with the yield strength not less than Q235, and the thickness of the cushion block is not less than 0.5 cm.
3. The rock clamping combination reinforcing device in the small-clear-distance tunnel according to claim 1 or 2, characterized in that: the counter-pull anchor rod is applied with pre-applied axial force, is made of a material with the strength not less than HRB400, and has the diameter not less than 25 mm.
4. The rock clamping combination reinforcing device in the small clear distance tunnel of claim 1, characterized in that: the steel plate has yield strength not less than Q235 and thickness not less than 2 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921211218.6U CN210264725U (en) | 2019-07-30 | 2019-07-30 | Clamping rock combination reinforcing apparatus in little clear distance tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921211218.6U CN210264725U (en) | 2019-07-30 | 2019-07-30 | Clamping rock combination reinforcing apparatus in little clear distance tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210264725U true CN210264725U (en) | 2020-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921211218.6U Active CN210264725U (en) | 2019-07-30 | 2019-07-30 | Clamping rock combination reinforcing apparatus in little clear distance tunnel |
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| CN (1) | CN210264725U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318771A (en) * | 2019-07-30 | 2019-10-11 | 湖南科技大学 | Shared Rock of Neighborhood Tunnel bracing means and Counter-pulled bolts brace pre axial force determine method |
-
2019
- 2019-07-30 CN CN201921211218.6U patent/CN210264725U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318771A (en) * | 2019-07-30 | 2019-10-11 | 湖南科技大学 | Shared Rock of Neighborhood Tunnel bracing means and Counter-pulled bolts brace pre axial force determine method |
| CN110318771B (en) * | 2019-07-30 | 2024-01-26 | 湖南科技大学 | Device for reinforcing rock clamping in small clear distance tunnel and method for determining pre-applied axial force of opposite-pulling anchor rod |
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