CN212774317U - Prestressed yielding anchor cable/rod support system - Google Patents
Prestressed yielding anchor cable/rod support system Download PDFInfo
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- CN212774317U CN212774317U CN202021109822.0U CN202021109822U CN212774317U CN 212774317 U CN212774317 U CN 212774317U CN 202021109822 U CN202021109822 U CN 202021109822U CN 212774317 U CN212774317 U CN 212774317U
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Abstract
The utility model relates to a prestressing force lets presses anchor rope/pole supporting system. The utility model aims at providing a prestressing force lets presses anchor rope/pole supporting system to realize the big deformation tunnel of soft rock and supporting construction's stability, solve current traditional supporting mode and destroy and the inefficacy scheduling problem because of warping the too big reason and appearing supporting construction in big deformation process. The technical scheme of the utility model is that: the utility model provides a prestressing force lets presses anchor rope/pole supporting system, has initial stage supporting construction and the secondary lining structure that hugs closely the tunnel section and set gradually, its characterized in that: the primary support structure is provided with a fiber concrete layer, a flexible reinforcing mesh and a plurality of prestress yielding anchor cables/rods arranged in surrounding rocks around the tunnel, one end of each prestress yielding anchor cable/rod is located in the surrounding rocks, and the other end of each prestress yielding anchor cable/rod penetrates through the primary support structure in the tunnel and is exposed. The utility model is suitable for a field is strutted in underground works construction.
Description
Technical Field
The utility model relates to a prestressing force lets presses anchor rope/pole supporting system. The method is suitable for the field of underground engineering construction support.
Background
At present, no effective support prevention and control means is established for the problem of large deformation of tunnel soft rock, the design concept and the traditional means of using strong support as passive rigid bearing are generally adopted, and the old traditional mode is mostly still used in the aspects of support mode and process materials, namely, the primary support uses steel bar mesh secondary re-spraying concrete, common rigid mortar anchor rods and steel arch frames as combined support, and the secondary lining uses rigid reinforced concrete with high mold injection reinforcement ratio and large thickness. In the supporting state, the primary support and the secondary lining have the main characteristics of high rigidity, strong supporting force and high manufacturing cost.
For a large deformation section of the tunnel, the deformation pressure of the surrounding rock can continuously increase and develop along with time, and most common rigid anchor rods fail due to the fact that the common rigid anchor rods cannot adapt to overlarge deformation of the surrounding rock; the steel arch frame is pressed, folded, distorted or sheared and unstable due to overlarge compression load value, and the sprayed concrete has the damage phenomena of severe cracking, breaking, scattering, dropping blocks and the like. Therefore, the traditional supporting mode and the construction process are greatly challenged in the construction of complex and changeable soft rock large-deformation tunnels.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: aiming at the existing problems, the prestress yielding anchor cable/rod supporting system is provided to realize the stability of the soft rock large-deformation tunnel and the supporting structure thereof and solve the problems of the conventional supporting mode, such as the damage and the failure of the supporting structure caused by overlarge deformation in the large-deformation process.
The utility model adopts the technical proposal that: the utility model provides a prestressing force lets presses anchor rope/pole supporting system, has initial stage supporting construction and the secondary lining structure that hugs closely the tunnel section and set gradually, its characterized in that:
the primary support structure is provided with a fiber concrete layer, a flexible reinforcing mesh and a plurality of prestress yielding anchor cables/rods arranged in surrounding rocks around the tunnel, one end of each prestress yielding anchor cable/rod is located in the surrounding rocks, and the other end of each prestress yielding anchor cable/rod penetrates through the primary support structure in the tunnel and is exposed.
The fiber concrete layer comprises a first fiber concrete layer and a second fiber concrete layer which are sequentially arranged on the section of the tunnel;
the flexible reinforcing mesh and the anchor backing plate which is matched with the prestress yielding anchor cable/rod to apply prestress are arranged between the first fiber concrete layer and the second fiber concrete layer.
The flexible reinforcing mesh is of a mesh structure woven by supporting ropes, a steel wire rope mesh is arranged in each mesh of the mesh structure, and the edge of the steel wire rope mesh is connected with the corresponding mesh through a plurality of connecting ropes.
The net structure is connected with the prestress yielding anchor cable/rod.
A prestress yielding anchor cable/rod supporting method is characterized in that:
spraying fiber concrete on the cross section of the tunnel to form a first fiber concrete layer;
mounting a prestress yielding anchor cable/rod in surrounding rocks around the tunnel on the first fiber concrete layer, and applying prestress by matching with an anchor backing plate;
hanging a flexible steel wire mesh on the first fiber concrete layer;
spraying fiber concrete on the surface of the first fiber concrete layer again to form a second fiber concrete layer;
and observing the yielding deformation condition of the prestress yielding anchor cable/rod, performing ring section grouting after the displacement reaches a preset value, and constructing a secondary lining structure on the inner side of the second fiber concrete layer.
The flexible steel bar mesh is of a mesh structure woven by support ropes, a steel wire rope mesh is arranged in each mesh of the mesh structure, and the edge of the steel wire rope mesh is connected with the corresponding mesh through a plurality of connecting ropes.
The net structure is connected with the prestress yielding anchor cable/rod.
The utility model has the advantages that: the utility model discloses utilize prestressing force to let the characteristic that produces big deformation under the settlement pressure condition that the pressure stock/pole possesses, cooperate flexible wire net and spout fiber shotcrete simultaneously, strut parameter and process through reasonable setting, can realize the strutting and disappearance structural damage to soft rock big deformation, and then guarantee the stability in tunnel under the soft rock big deformation.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Fig. 2 is a schematic view of the arrangement of the anchor pads in the embodiment.
Fig. 3 is a schematic structural diagram of a real-time flexible steel wire mesh.
In the figure: 1. a first fiber concrete layer; 2. a second fiber concrete layer; 3. prestressing force lets presses the anchor cable/pole; 4. a wire rope mesh; 5. connecting ropes; 6. a support line; 7. and (5) anchoring a backing plate.
Detailed Description
Fig. 1-3 show a prestressed yielding anchor cable/rod support system having a primary support structure and a secondary lining structure sequentially disposed adjacent to a cross section of a tunnel.
The primary supporting structure in this example has a first fiber concrete layer 1, a second fiber concrete layer 2, a flexible reinforcing mesh (hook mesh) and a prestressed yielding anchor cable/rod 3, wherein the prestressed yielding anchor cable/rod is composed of a cable/rod body, a nut, a yielding anchor and the like.
Wherein the first fiber concrete layer is arranged close to the section of the tunnel, and the second fiber concrete layer is arranged close to the first fiber concrete layer; the prestress yielding anchor cable/rod is uniformly arranged in surrounding rocks around the tunnel in a quincunx shape, the inner end of the prestress yielding anchor cable/rod is fixed in the surrounding rocks, and the outer end of the prestress yielding anchor cable/rod is exposed after penetrating through the first fiber concrete layer and the second fiber concrete layer; the prestress yielding anchor cable/rod is provided with an anchor backing plate which can be matched with the prestress yielding anchor cable/rod to apply prestress, and the anchor backing plate is positioned between the first fiber concrete layer and the second fiber concrete layer; and a flexible reinforcing mesh is arranged between the first fiber concrete layer and the second fiber concrete layer, the reinforcing mesh of the structure is quickly installed, and the construction time of the support is shortened.
In this embodiment, the flexible steel bar mesh has a mesh structure woven by support ropes, a steel wire rope mesh is arranged in each mesh of the mesh structure, and the edge of the steel wire rope mesh is connected with the corresponding mesh through a plurality of connecting ropes. The net structure is connected with the prestress yielding anchor cable/rod.
In the embodiment, the anchor plate is matched with the prestressed yielding anchor cable/rod, so that the anchor plate is ensured not to warp and deform under the condition of applying high-strength prestress, the common anchor plate model with the size of 15 x 0.6cm (length x width x thickness) is abandoned, and a large flat plate type anchor plate (more than 40 x 3cm) is used as the anchor plate.
The embodiment adopts the fiber concrete, has high toughness, can continuously bear the transmitted load after cracking, and does not generate brittle failure; the rebound quantity is small, the stress distribution in the spray layer is uniform, the stress value is small, and the pressure yielding and deformation resistance are good.
For a common anchor cable/rod, in order to deal with the deformation of a rock body after the anchor cable/rod is applied, a part of deformation needs to be reserved, so that the support strength of the anchor cable/rod at the initial stage of support is weak. In order to compensate for this drawback, it is necessary to use a rigid support such as an arch frame. According to the embodiment, the function of yielding the anchor cable/rod with large transverse resistance deformation is utilized, strong supporting force can be applied to surrounding rocks at the initial stage of supporting, meanwhile, the bearing capacity of sprayed fiber concrete is rapidly improved by utilizing a finished product steel wire rope net, a traditional steel frame supporting system is abandoned under the condition that the safety of the surrounding rocks and the supporting system is ensured, the deformation of various surrounding rocks in a soft rock tunnel can be well adapted, the stability of the tunnel is kept, and the engineering safety is ensured.
The prestress yielding anchor cable/rod supporting method in the embodiment comprises the following steps
Spraying fiber concrete on the cross section of the tunnel to form a first fiber concrete layer;
mounting a prestress yielding anchor cable/rod in surrounding rocks around the tunnel on the first fiber concrete layer, and applying prestress by matching with an anchor backing plate;
hanging a flexible steel wire mesh on the first fiber concrete layer;
spraying fiber concrete on the surface of the first fiber concrete layer again to form a second fiber concrete layer;
and observing the yielding deformation condition of the prestress yielding anchor cable/rod, performing section grouting after the displacement reaches a preset value, and constructing a secondary lining structure on the inner side of the second fiber concrete layer.
In the embodiment, the yielding deformation condition of the prestress yielding anchor cable/rod can be observed by arranging long-term displacement measuring points at the top and the waist, the slippage condition of the exposed section of the prestress yielding anchor cable/rod after penetrating through the first and second fiber concrete layers is observed, and the deformation condition of the cable/rod yielding section is judged.
Claims (4)
1. The utility model provides a prestressing force lets presses anchor rope/pole supporting system, has initial stage supporting construction and the secondary lining structure that hugs closely the tunnel section and set gradually, its characterized in that:
the primary support structure is provided with a fiber concrete layer, a flexible reinforcing mesh and a plurality of prestress yielding anchor cables/rods arranged in surrounding rocks around the tunnel, one end of each prestress yielding anchor cable/rod is located in the surrounding rocks, and the other end of each prestress yielding anchor cable/rod penetrates through the primary support structure in the tunnel and is exposed.
2. The pre-stressed yield anchor cable/rod support system of claim 1, wherein: the fiber concrete layer comprises a first fiber concrete layer and a second fiber concrete layer which are sequentially arranged on the section of the tunnel;
the flexible reinforcing mesh and the anchor backing plate which is matched with the prestress yielding anchor cable/rod to apply prestress are arranged between the first fiber concrete layer and the second fiber concrete layer.
3. The pre-stressed yield cable/rod support system according to claim 1 or 2, wherein: the flexible reinforcing mesh is of a mesh structure woven by supporting ropes, a steel wire rope mesh is arranged in each mesh of the mesh structure, and the edge of the steel wire rope mesh is connected with the corresponding mesh through a plurality of connecting ropes.
4. The pre-stressed yield anchor cable/rod support system of claim 3, wherein: the net structure is connected with the prestress yielding anchor cable/rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021109822.0U CN212774317U (en) | 2020-06-16 | 2020-06-16 | Prestressed yielding anchor cable/rod support system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021109822.0U CN212774317U (en) | 2020-06-16 | 2020-06-16 | Prestressed yielding anchor cable/rod support system |
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| Publication Number | Publication Date |
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| CN212774317U true CN212774317U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021109822.0U Active CN212774317U (en) | 2020-06-16 | 2020-06-16 | Prestressed yielding anchor cable/rod support system |
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| CN (1) | CN212774317U (en) |
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2020
- 2020-06-16 CN CN202021109822.0U patent/CN212774317U/en active Active
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