Tunnel anchor type anchoring system based on super-large-diameter pile anchoring

Abstract

The utility model relates to the technical field of civil construction engineering, in particular to a tunnel anchor type anchoring system based on super-large-diameter pile anchoring, which comprises an anchor plug body, a steel strand, a steel wire rope, a steel wire rope and a steel wire rope, the super-large-diameter anchoring pile and the anchor plug body are integrally formed in a pouring mode, and the super-large-diameter anchoring pile is vertically embedded and fixed in a rock mass. The super-large-diameter anchoring pile is additionally arranged on the basis of an existing tunnel anchor, the super-large-diameter anchoring pile and the anchor plug body are poured into a whole, force transmission is direct, and an anchoring system of a main cable in the anchor plug body transmits drawing force to the anchor plug body and concrete soil of the super-large-diameter anchoring pile. The cable force is transmitted to the rock mass through friction and wedge effect of the anchor plug body and the rock mass, and the embedding effect of the anchor plug body in the rock mass is improved and the pulling resistance of the anchor plug body is improved by utilizing the drawing force transmitted to the super-large-diameter pile by the anchoring system and the huge self-weight of the super-large-diameter anchor pile and the embedding effect of the super-large-diameter anchor pile in the rock mass. And the anti-pulling safety coefficient is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering and construction, in particular to a tunnel anchor type anchoring system based on super large diameter pile anchoring. Background Art

[0002] With the vigorous construction of transportation projects in the western mountainous areas, there are more and more examples of construction of suspension bridges in high mountain canyon areas. In high mountain canyon areas, there are often unfavorable geological conditions such as thick slope cover, strong rock weathering, developed rock cracks, weak rock strength itself, and thick extrusion fracture zones formed by earthquake compression. When the bridge is affected by the road line shape and has to be set up under such geological conditions, the design of the anchor becomes quite difficult. Due to the steep slope terrain in high mountain canyon areas, it is difficult to carry out large-scale excavation, so gravity anchors are not suitable. Therefore, tunnel anchors become the key to the design. In soft rock and unfavorable geological areas, how to provide sufficient anchoring and clamping for the tunnel anchors in the surrounding rock mass so that the tunnel anchors have sufficient pull-out safety factor to ensure structural safety has become the key to the design! Utility Model Content

[0003] The utility model aims to provide a tunnel anchor type anchoring system based on super-large diameter pile anchoring, which utilizes super-large diameter anchoring piles to provide sufficient anchoring force for tunnel anchors, improve the pull-out safety factor, and ensure structural safety.

[0004] The utility model is realized by the following technical solutions:

[0005] Tunnel anchor system based on extra-large diameter pile anchoring, including:

[0006] An anchor plug body, in which a steel strand for connecting to the main cable is arranged;

[0007] And an extra-large diameter anchor pile cast integrally with the anchor plug body, wherein the extra-large diameter anchor pile is vertically embedded in the rock mass.

[0008] The utility model adds an extra-large diameter anchor pile on the basis of the existing tunnel anchor, utilizes the huge deadweight of the extra-large diameter anchor pile and the embedding effect of the extra-large diameter anchor pile in the rock mass, increases the embedding effect of the anchor plug body in the rock mass, improves the pull-out resistance of the anchor plug body, and improves the pull-out safety factor.

[0009] In order to better exert the anchoring effect of the super-large diameter anchor pile, the utility model casts the super-large diameter anchor pile and the anchor plug body as one body, and the force transmission is direct. The anchoring system of the main cable in the anchor plug body transmits the pulling force to the anchor plug body and the concrete soil of the super-large diameter anchor pile, and transmits the cable force to the rock mass through the friction between the anchor plug body and the rock mass and the wedge effect. The pulling force transmitted to the super-large diameter pile by the anchoring system is transmitted to a wider range of rock mass through the bending stiffness of the super-large diameter anchor pile itself and the embedding effect of the super-large diameter pile in the rock mass. The combined anchoring unit formed by the super-large diameter anchor pile and the surrounding rock mass shares the cable force, improves the anti-pulling safety factor of the anchor plug body, and thus solves the problem of difficult tunnel anchor design in soft rock and poor geological areas.

[0010] Furthermore, the super-large diameter anchor pile is composed of an upper embedded section, a combined section and a lower embedded section from top to bottom, wherein the combined section and the anchor plug body are cast as one piece.

[0011] Furthermore, a plurality of tooth blocks are arranged on the outer wall of the super-large diameter anchor pile, and the tooth blocks protrude from the outer wall of the super-large diameter anchor pile.

[0012] Furthermore, the upper surface of the tooth block is a plane, and the lower surface is an inclined surface.

[0013] The function of the tooth block is to resist the upward pulling force of the super-large diameter anchor pile, so the pressure-bearing surface of the tooth block is facing upward. The pressure-bearing surface of the tooth block is mainly the upper surface, and it is made flat mainly for the convenience of excavation; the inclined surface of the lower surface is also for the convenience of construction, while increasing the friction area.

[0014] Furthermore, a plurality of tooth blocks are evenly arranged on the outer wall of the super-large diameter anchor pile.

[0015] Furthermore, it also includes a plurality of anchor cables, one end of which is connected to the super-large diameter anchor pile, and the other end of which is embedded in the rock mass.

[0016] Tunnel anchors must resist pull-out force when under stress. After anchoring with super-large diameter anchor piles, part of the pull-out force will be transferred to the super-large diameter anchor piles. Then the super-large diameter anchor piles will be subjected to upward pull-out force. Adding teeth and anchor cables is to resist the pull-out force received by the pile body and increase the anchoring effect with the bedrock (rock mass).

[0017] Furthermore, an angle less than 90° is formed between the anchor cable and the super-large diameter anchor pile.

[0018] Furthermore, a plurality of anchor cables have the same angle with the super-large diameter anchor piles.

[0019] Furthermore, the front of the anchor plug body is sequentially provided with a front anchor chamber and a front hole, and a buttress is provided at the junction of the front anchor chamber and the front hole.

[0020] The above-mentioned anchor plug body, front anchor chamber, front hole and pier together constitute a tunnel anchor.

[0021] Furthermore, the super-large diameter anchor pile is a cylindrical structure, and the diameter of the super-large diameter anchor pile is greater than or equal to 5m.

[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0023] 1. The utility model adds an extra-large diameter anchor pile on the basis of the existing tunnel anchor, casts the extra-large diameter anchor pile and the anchor plug body as one, and transmits force directly. The anchor system of the main cable in the anchor plug body transmits the pulling force to the anchor plug body and the concrete soil of the extra-large diameter anchor pile, and transmits the cable force to the rock mass through the friction and wedge effect between the anchor plug body and the rock mass, while the anchor system transmits the pulling force to the extra-large diameter pile, utilizes the huge dead weight of the extra-large diameter anchor pile and the embedding effect of the extra-large diameter anchor pile in the rock mass, increases the embedding effect of the anchor plug body in the rock mass, improves the pull-out resistance of the anchor plug body, and improves the pull-out safety factor.

[0024] 2. The utility model provides a plurality of tooth blocks and a plurality of anchor cables on the outer wall of the super-large diameter anchor pile, so that the super-large diameter anchor pile can better resist the pull-out force received by the pile body and increase the anchoring effect with the bedrock (rock mass). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the tunnel anchor type anchoring system based on super large diameter pile anchoring of the utility model;

[0027] Figure 2 This is a force diagram of the tunnel anchor type anchoring system based on super large diameter pile anchoring of the utility model.

[0028] Marks and corresponding parts names in the attached drawings:

[0029] 1- extra large diameter anchor pile; 2- anchor plug body; 3- front anchor chamber; 4- pier; 5- front hole; 6- main cable; 7- tooth block; 8- anchor cable; 100- ground line. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0031] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, in order to avoid confusing the present invention, well-known structures, materials or methods are not specifically described.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Embodiment 1:

[0034] like Figure 1 As shown, the tunnel anchor system based on super-large diameter pile anchoring includes:

[0035] An anchor plug body 2, in which a steel strand for connecting to a main cable 6 is arranged;

[0036] And an extra-large diameter anchor pile 1 integrally cast with the anchor plug body 2, wherein the extra-large diameter anchor pile 1 is vertically embedded in the rock mass.

[0037] Among them, the front of the anchor plug body 2 is successively provided with a front anchor chamber 3 and a front hole 5, and a buttress 4 is arranged at the junction of the front anchor chamber 3 and the front hole 5; the anchor plug body 2, the front anchor chamber 3, the front hole 5 and the buttress 4 together constitute a tunnel anchor.

[0038] The super-large diameter anchor pile 1 is composed of an upper embedded section, a combined section and a lower embedded section from top to bottom, wherein the combined section and the anchor plug body 2 are cast as one.

[0039] The super-large diameter anchor pile 1 is a cylindrical structure, and the diameter of the super-large diameter anchor pile 1 is greater than or equal to 5 m.

[0040] The construction steps of the tunnel anchor type anchoring system described in this embodiment are as follows:

[0041] The front hole 5, the front anchor chamber 3 and the tunnel where the anchor body 2 is located are excavated in sequence, and at the same time, the tunnel where the extra-large diameter anchor pile 1 is located is excavated vertically, and the tunnel where the extra-large diameter anchor pile 1 is located is connected with the tunnel where the anchor body 2 is located; a steel strand is installed in the tunnel where the anchor body 2 is located, and the steel strand is connected to the main cable 6, so that the main cable 6 is led out of the front hole 5 to the ground line 100; then concrete is poured in the tunnel where the anchor body 2 is located and in the tunnel where the extra-large diameter anchor pile 1 is located to form an integrally cast anchor body 2 and a large diameter anchor pile 1.

[0042] The design method of the tunnel anchor type anchoring system described in this embodiment is as follows:

[0043] According to Article 8.4.5 of the Highway Suspension Bridge Design Code, the calculation formula for the pull-out safety factor of the anchor plug is:

[0044]

[0045] Where K is the anti-sliding stability coefficient; f′ is the anti-shear friction coefficient of the contact surface; C′ is the anti-shear cohesion of the contact surface kPa; A is the contact area m 2 ; P is the design value of the main cable tension kN; W F kN is the component of the structure's deadweight perpendicular to the sliding surface; W L kN is the component of the structure's deadweight along the pulling direction.

[0046] From the above formula, we know that the pull-out resistance of the anchor plug comes from three aspects: f′, W F The term is the pull-out force generated by the interface friction in the direction of the sliding surface due to the deadweight of the structure; the terms C′ and A are the cohesion provided by the shear resistance of the rock mass at the contact surface between the anchor plug and the rock mass; W L The term is the pull-out resistance provided by the component of the structure's self-weight in the pull-out direction.

[0047] When the extra-large diameter anchor pile 1 is added, the pull-out force generated by the extra-large diameter anchor pile 1 will be increased in the above formula. Figure 2 As shown, the super-large diameter anchor pile 1 is vertically divided into an upper embedded section, a combined section, and a lower embedded section. The upper embedded section and the lower embedded section can make full use of the embedding effect of the rock mass on the pile foundation. The combined section and the anchor body 2 are cast as one, so the embedding effect of this section is not considered. The pull-out resistance provided by the super-large diameter anchor pile 1 consists of three parts: the first part is provided by the component of the deadweight of the super-large diameter anchor pile 1 along the pulling direction (named Gp); the second part is provided by the component of the embedding force of the rock mass outside the super-large diameter anchor pile 1 along the pulling direction (named Fs); the third part is provided by the pull-out resistance generated by the bending stiffness of the super-large diameter anchor pile 1 itself (named Fp). Therefore, the pull-out safety factor is expressed as:

[0048]

[0049] The term in brackets in the above formula is the pull-out resistance provided by the super-large diameter anchor pile 1.

[0050] The combined anchoring unit formed by the super-large diameter anchor pile 1 and the surrounding rock mass proposed in this embodiment, combined with the anchor plug body to form an anchoring system, can provide a considerable part of the pull-out force for the suspension bridge tunnel anchor in soft rock and poor geological areas, effectively improve the pull-out safety factor of the tunnel anchor, and enhance the applicability of the suspension bridge in high mountain canyon areas, soft rock and poor geological conditions. The anchoring system is a good solution for tunnel anchors in high mountain canyon areas, soft rock and poor geological areas.

[0051] Embodiment 2:

[0052] This embodiment is based on the embodiment 1, and a plurality of tooth blocks 7 are provided on the outer wall of the super-large diameter anchor pile 1 , and the tooth blocks 7 protrude from the outer wall of the super-large diameter anchor pile 1 .

[0053] Preferably, the upper surface of the tooth block 7 is a plane, and the lower surface is an inclined surface.

[0054] Preferably, a plurality of tooth blocks 7 are evenly arranged on the outer wall of the super-large diameter anchor pile 1 .

[0055] In a preferred case, a plurality of anchor cables 8 are further included, one end of each anchor cable 8 is connected to the super-large diameter anchor pile 1 , and the other end of each anchor cable 8 is embedded in the rock mass.

[0056] Preferably, the anchor cable 8 and the super-large diameter anchor pile 1 form an angle less than 90°.

[0057] Preferably, the plurality of anchor cables 8 and the super-large diameter anchor pile 1 have the same angle.

[0058] The function of the tooth block 7 of this embodiment is to resist the force of pulling the super-large diameter anchor pile 1 upward, so the pressure-bearing surface of the tooth block 7 is facing upward. The pressure-bearing surface of the tooth block 7 is mainly the upper surface, and it is made into a plane mainly for the convenience of excavation; the inclined surface of the lower surface is also for the convenience of construction and to increase the friction area.

[0059] In this embodiment, a plurality of tooth blocks 7 and a plurality of anchor cables 8 are arranged on the outer wall of the super-large diameter anchor pile 1, so that the super-large diameter anchor pile 1 can better resist the pull-out force received by the pile body and increase the anchoring effect with the bedrock (rock mass).

[0060] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

[0061] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship, without substantial change of the technical content, should also be regarded as the scope of the implementation of the utility model.

Claims

1. A tunnel anchor system based on super-large diameter pile anchoring, characterized in that: include: An anchor plug body (2), wherein a steel strand for connecting to a main cable (6) is arranged in the anchor plug body (2); and an extra-large diameter anchor pile (1) integrally cast with the anchor plug body (2), wherein the extra-large diameter anchor pile (1) is vertically embedded in the rock mass; The diameter of the super-large diameter anchor pile (1) is greater than or equal to 5 m.

2. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 1 is characterized in that: The super-large diameter anchor pile (1) comprises, from top to bottom, an upper embedding section, a combined section and a lower embedding section, wherein the combined section and the anchor plug body (2) are cast as one piece.

3. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 1 is characterized in that: The outer wall of the super-large diameter anchor pile (1) is provided with a plurality of tooth blocks (7), and the tooth blocks (7) protrude from the outer wall of the super-large diameter anchor pile (1).

4. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 3 is characterized in that: The upper surface of the tooth block (7) is a plane, and the lower surface is an inclined surface.

5. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 3 is characterized in that: A plurality of tooth blocks (7) are evenly arranged on the outer wall of the super-large diameter anchor pile (1).

6. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 1, characterized in that: It also comprises a plurality of anchor cables (8), one end of each of which is connected to the super-large diameter anchor pile (1) and the other end of each of which is embedded in the rock mass.

7. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 6, characterized in that: An angle less than 90° is formed between the anchor cable (8) and the super-large diameter anchor pile (1).

8. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 7, characterized in that: The plurality of anchor cables (8) and the super-large diameter anchor pile (1) have the same included angle.

9. The tunnel anchoring system based on super-large diameter pile anchoring according to claim 1, characterized in that: The front of the anchor plug body (2) is provided with a front anchor chamber (3) and a front hole (5) in sequence, and a buttress (4) is provided at the junction of the front anchor chamber (3) and the front hole (5).

10. The tunnel anchoring system based on super-large diameter pile anchoring according to any one of claims 1 to 9, characterized in that: The super-large diameter anchor pile (1) is a cylindrical structure.

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