Fabricated tunnel roadbed connecting structure and tunnel portal roadbed project

Abstract

The utility model discloses an assembly type tunnel subgrade connection structure and tunnel portal subgrade project, including prefabricated subgrade block, prefabricated subgrade block includes the solid waste bulk solid structure and light plate that overlap mutually, the light plate is provided with a plurality of functional holes along the length direction, at least one functional hole is used as the connecting hole, the light plate is used as the connecting hole, and the connecting hole is used for connecting the solid waste bulk solid structure and the light plate. The connecting structure further comprises connecting anchor rods penetrating through the tunnel portal slope, and the connecting holes of the prefabricated roadbed blocks located on the tunnel portal slope are connected with the connecting anchor rods in a matched mode. The prefabricated roadbed blocks located outside the tunnel portal slope are laid in a layered mode in the transverse direction.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering, in particular, to an assembled tunnel roadbed connection structure. In addition, the utility model also relates to a tunnel portal roadbed engineering including the assembled tunnel roadbed connection structure. Background Art

[0002] When the tunnel entrance is located on a high and steep slope, the working platform formed by directly excavating the original soil often cannot meet the needs of efficient construction, and it is necessary to widen the working platform or set up a temporary working platform in various ways. When the tunnel entrance is connected to the roadbed, that is, the valley below the tunnel entrance needs to be filled to form the roadbed, the roadbed can be filled first and used as a temporary working platform for tunnel construction, but this method also has certain problems.

[0003] The red line land area near the tunnel entrance is limited, and the slope filling is easy to exceed the red line, which requires additional land acquisition. At the same time, since the roadbed filling material is formed on-site by large-scale construction machinery at the construction site, the construction quality is greatly restricted by the performance of the construction machinery and the site environmental conditions. When the site environmental conditions are complex, large-scale construction machinery is difficult to exert its benefits, and the roadbed quality level is also limited when small-scale construction machinery is used. Therefore, in complex site environmental conditions, the efficiency and quality of traditional roadbed filling methods are greatly affected. Since the original ground at the tunnel entrance is often a high and steep slope, it is difficult to excavate steps and fill layer by layer. The filling platform is prone to large settlement or landslides, causing cracks on the working platform, broken plates, uneven settlement of the transition between the connection and the roadbed, etc., which poses a major safety hazard. Utility Model Content

[0004] The utility model provides an assembled tunnel roadbed connection structure and a tunnel portal roadbed project to solve the technical problem in the prior art that the construction of large mechanical equipment on the tunnel portal slope is limited, resulting in the inability to excavate steps and causing large settlement and landslides at the slope intersection.

[0005] According to one aspect of the utility model, there is provided an assembled tunnel roadbed connection structure, comprising a prefabricated roadbed block, the prefabricated roadbed block comprising an overlapping solid waste bulk structure and a lightweight plate, the lightweight plate being provided with a plurality of functional holes along the length direction, at least one of the functional holes being used as a connection hole, the connection structure also comprising a connection anchor rod penetrating the tunnel portal slope, the connection holes of the prefabricated roadbed block located on the tunnel portal slope being matched and connected with the connection anchor rod; the prefabricated roadbed blocks located outside the tunnel portal slope are laid in layers along the transverse direction.

[0006] As a further improvement of the above technical solution, vertical fillers are arranged between adjacent prefabricated roadbed blocks, and horizontal buffer layers are arranged between each layer of prefabricated roadbed blocks.

[0007] As a further improvement of the above technical solution, at least one of the functional holes is penetrated by a negative pressure tube, and the negative pressure tube is used to connect with the vacuum pumping equipment; at least one functional hole serves as a water injection hole, and a water injection tube is penetrated by a water injection tube at a preset position, and the tube wall of the negative pressure tube and the tube wall of the water injection tube are respectively and evenly distributed with through holes.

[0008] As a further improvement of the above technical solution, a small step structure for positioning the prefabricated roadbed blocks is provided on the tunnel entrance slope.

[0009] As a further improvement of the above technical solution, the solid waste bulk structure is in a prism shape.

[0010] As a further improvement of the above technical solution, adjacent layers of prefabricated roadbed blocks are laid with staggered joints.

[0011] As a further improvement of the above technical solution, the connecting anchor rod passes through the connecting hole of the prefabricated roadbed block corresponding to the slope of the tunnel entrance, and the protruding end of the connecting anchor rod is fastened with a bolt.

[0012] As a further improvement of the above technical solution, the spacing between the prefabricated roadbed blocks on the tunnel portal slope and the transversely laid prefabricated roadbed blocks is a first spacing, the spacing between the transversely laid prefabricated roadbed blocks is a second spacing, and the first spacing is 2-3 times the second spacing.

[0013] As a further improvement of the above technical solution, the connection hole is also used to penetrate a connection pipe, and the connection pipe is used to connect with a connection hole matching the upper position of adjacent prefabricated roadbed blocks.

[0014] According to another aspect of the utility model, a tunnel portal roadbed project is also provided, which includes the above-mentioned assembled tunnel roadbed connection structure.

[0015] The utility model has the following beneficial effects:

[0016] The connection structure drives connection anchors into the intersection slope between the tunnel opening and the roadbed. Based on the functional holes opened on the lightweight plates set up in the superimposed structure of the prefabricated roadbed blocks, the prefabricated roadbed blocks are arranged along the tunnel direction so that the connection anchors are inserted into the connection holes, thereby ensuring the construction quality of the intersection surface. The slope and the prefabricated roadbed blocks are connected by the connection anchors, which effectively solves the problem that the conventional large step excavation method at the junction of the high and steep slopes cannot be used. At the same time, the uneven settlement of the transition section between the tunnel and the roadbed is reduced. The prefabricated roadbed blocks outside the tunnel opening are arranged horizontally so that The functional holes are horizontally connected and located on the slopes on both sides of the roadbed structure. Based on the roadbed pavement having a certain slope, the roadbed structure has a certain drainage capacity, which can discharge small-scale water accumulated in the valley due to the rainy season and prevent the roadbed from softening and collapsing after being soaked in water for a long time. Prefabricated roadbed blocks are used for tunnel-roadbed connection construction to form a working platform that meets the roadbed design quality standards under narrow, steep and complex terrain conditions. After the tunnel construction is completed, the roadbed structure serving as the working platform does not need to be dismantled and can be used directly as the final roadbed structure, avoiding repeated construction, greatly improving construction efficiency and reducing costs.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of roadbed paving in a preferred embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the slope connection structure of the preferred embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the anchor rod construction structure of a preferred embodiment of the utility model.

[0022] Legend:

[0023] 1. Solid waste bulk structure 2. Lightweight board 21. Functional hole 3. Connecting anchor rod 4. Vertical buffer layer 5. Horizontal buffer layer 6. Tunnel opening 7. Intersection slope 71. Small step structure 8. Bolts. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0025] Figure 1 This is a schematic diagram of roadbed paving in a preferred embodiment of the utility model; Figure 2 It is a schematic diagram of the slope connection structure of the preferred embodiment of the utility model; Figure 3 It is a schematic diagram of the anchor rod construction structure of a preferred embodiment of the utility model.

[0026] like Figures 1 to 3 As shown, the prefabricated tunnel roadbed connection structure of this embodiment includes a prefabricated roadbed block, which includes an overlapping solid waste bulk structure 1 and a lightweight plate 2. The lightweight plate 2 is provided with a plurality of functional holes 21 along the length direction, at least one functional hole 21 serving as a connection hole, and the connection structure also includes a connection anchor rod 3 penetrating the slope of the tunnel opening 6. The connection holes of the prefabricated roadbed blocks located on the slope of the tunnel opening 6 are matched and connected with the connection anchor rod 3; the prefabricated roadbed blocks located outside the slope of the tunnel opening 6 are laid in layers along the horizontal direction.

[0027] Among them, the prefabricated roadbed block of this embodiment is a superimposed structure, and the construction solid waste is used as the main material to be rolled into a traditional soft bulk material as the solid waste bulk structure 1 on the upper part of the roadbed block, which reduces the material cost. It has high cohesion and a relatively low internal friction angle, so that the prefabricated roadbed block can maintain the overall shape and has a certain deformation ability. The lower part of the roadbed block is designed as a lightweight plate 2, which reduces the proportion of hard material usage, overcomes the adverse effects of using high-strength structural blocks, and effectively reduces costs. The lightweight plate 2 with a certain strength improves the bending resistance of the bottom of the roadbed block and makes the roadbed block easier to hoist. The functional hole 21 reserved in the lightweight plate 2 can also be used to penetrate the hanger to connect with the hoisting device, and the hoisting process is more stable, which solves the problem that the prefabricated roadbed block prepared with soft bulk materials is easy to disintegrate and scatter under its own weight during the hoisting process;

[0028] The connection structure drives the connection anchor rod 3 into the intersection slope 7 between the tunnel opening 6 and the roadbed, and arranges the prefabricated roadbed block along the tunnel direction based on the functional hole 21 opened on the lightweight plate 2 set in the superimposed structure of the prefabricated roadbed block so that the connection anchor rod 3 is inserted into the connection hole, thereby ensuring the construction quality of the intersection surface. The slope and the prefabricated roadbed block are connected by the connection anchor rod 3, which effectively solves the problem that the conventional large step excavation method at the junction of the high and steep slope cannot be used, and at the same time reduces the uneven settlement of the transition section between the tunnel and the roadbed. The prefabricated roadbed blocks outside the tunnel opening 6 are arranged in the horizontal direction. The functional hole 21 is made to penetrate horizontally and the through openings at both ends are located on the side slopes of the roadbed structure. Based on the roadbed pavement having a certain slope, the roadbed structure has a certain drainage capacity, which can discharge small-scale water accumulated in the valley due to the rainy season and prevent the roadbed from softening and collapsing after being soaked in water for a long time. Prefabricated roadbed blocks are used for tunnel-roadbed connection construction to form a working platform that meets the roadbed design quality standards under narrow, steep and complex terrain conditions. After the tunnel construction is completed, the roadbed structure serving as the working platform does not need to be dismantled and can be used directly as the final roadbed structure, avoiding repeated construction, greatly improving construction efficiency and reducing costs.

[0029] In one embodiment, vertical caulking materials are provided between adjacent prefabricated roadbed blocks to form a vertical buffer layer 4, and a horizontal buffer layer 5 is provided between each layer of prefabricated roadbed blocks, so as to achieve inter-block connection and accommodate inter-block deformation in a simple manner;

[0030] In one embodiment, at least one functional hole 21 is provided with a negative pressure pipe, and the negative pressure pipe is used to connect with a vacuum pumping device; at least one functional hole 21 is used as a water injection hole, and a water injection pipe is provided through the water injection hole at a preset position, and through holes are evenly distributed on the pipe wall of the negative pressure pipe and the pipe wall of the water injection pipe, respectively. By providing the negative pressure pipe and the water injection pipe, negative pressure is applied to the material of the buffer layer based on a vacuum-assisted water tamping method, and the excess water in the caulking material is drawn out to make it dense, thereby accelerating the consolidation settlement of the buffer material and reducing the natural settlement of the formed roadbed;

[0031] In one embodiment, a small step structure 71 for positioning prefabricated roadbed blocks is provided on the slope of the tunnel entrance 6. It should be noted that the small step is different from the step structure in the prior art that requires large equipment for excavation. It can be excavated using small tools and equipment such as a small excavator and a mechanical shovel to provide a fulcrum for the paving of the prefabricated roadbed blocks.

[0032] In one embodiment, the solid waste bulk structure 1 is prism-shaped and has a certain degree of self-stability, which reduces the risk of scattering during lifting and transportation; and after laying, the distance between blocks is larger at the top and smaller at the bottom, and the missing corners can be repaired and the gaps filled with buffer materials.

[0033] In one embodiment, adjacent layers of prefabricated roadbed blocks are laid with staggered seams to increase the overall stability of the roadbed and avoid excessive deformation caused by settlement of the roadbed through seams.

[0034] In one embodiment, the connecting anchor rod 3 passes through the connecting hole of the prefabricated roadbed block corresponding to the slope of the tunnel portal 6, and the protruding end of the connecting anchor rod 3 is fastened with a bolt 8, wherein the spacing between the prefabricated roadbed block on the slope of the tunnel portal 6 and the transversely laid prefabricated roadbed block is a first spacing, and the spacing between the transversely laid prefabricated roadbed blocks is a second spacing, and the first spacing is 2-3 times the second spacing, and space is reserved for the fastening of the bolt 8, and is filled with low-strength and high-fluidity materials, such as C10 or C15 low-strength concrete, foam concrete, etc. with high content of active admixtures such as fly ash and slag, to ensure that the material has high fluidity, relatively low design strength, and long strength age, so as to match the roadbed settlement period and ensure the construction quality of the connection.

[0035] In one embodiment, the connecting hole is also used to pass a connecting pipe, which is used to connect to a connecting hole that matches the upper position of adjacent prefabricated roadbed blocks, thereby achieving a simple connection between the prefabricated roadbed blocks and making the roadbed structure integral; the length of the connecting pipe is less than or equal to the length of the prefabricated roadbed block.

[0036] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An assembled tunnel roadbed connection structure, characterized in that: The invention comprises a prefabricated roadbed block, wherein the prefabricated roadbed block comprises a superimposed solid waste bulk structure (1) and a lightweight plate (2), wherein the lightweight plate (2) is provided with a plurality of functional holes (21) along the length direction, and at least one of the functional holes (21) is used as a connection hole, and the connection structure further comprises a connection anchor rod (3) penetrating the side slope of a tunnel opening (6), wherein the connection hole of the prefabricated roadbed block located at the side slope of the tunnel opening (6) is matched and connected with the connection anchor rod (3); and the prefabricated roadbed block located outside the side slope of the tunnel opening (6) is laid in layers along the transverse direction.

2. The assembled tunnel roadbed connection structure according to claim 1 is characterized in that: Vertical fillers are arranged between adjacent prefabricated roadbed blocks, and horizontal buffer layers (5) are arranged between each layer of prefabricated roadbed blocks.

3. The assembled tunnel roadbed connection structure according to claim 2 is characterized in that: At least one of the functional holes (21) is penetrated by a negative pressure pipe, and the negative pressure pipe is used to connect to a vacuum pumping device; at least one of the functional holes (21) is used as a water injection hole, and a water injection pipe is penetrated by a water injection hole at a preset position, and through holes are evenly distributed on the wall of the negative pressure pipe and the wall of the water injection pipe.

4. The assembled tunnel roadbed connection structure according to claim 1, characterized in that: A small step structure (71) for positioning the prefabricated roadbed blocks is provided on the side slope of the tunnel opening (6).

5. The assembled tunnel roadbed connection structure according to claim 1, characterized in that: The solid waste bulk structure (1) is in the shape of a prism.

6. The assembled tunnel roadbed connection structure according to claim 1, characterized in that: Adjacent layers of precast roadbed blocks are laid with staggered joints.

7. The assembled tunnel roadbed connection structure according to claim 1, characterized in that: The connecting anchor rod (3) passes through a connecting hole of a prefabricated roadbed block corresponding to the slope of the tunnel opening (6), and a bolt (8) is arranged at the protruding end of the connecting anchor rod (3) for fastening.

8. The assembled tunnel roadbed connection structure according to claim 7, characterized in that: The spacing between the prefabricated roadbed blocks on the side slope of the tunnel portal (6) and the transversely laid prefabricated roadbed blocks is a first spacing, the spacing between the transversely laid prefabricated roadbed blocks is a second spacing, and the first spacing is 2-3 times the second spacing.

9. The assembled tunnel roadbed connection structure according to claim 1, characterized in that: The connection hole is also used for passing a connection pipe, and the connection pipe is used for connecting with a connection hole matching the upper position of adjacent prefabricated roadbed blocks.

10. A tunnel portal roadbed engineering, characterized in that: The invention relates to an assembled tunnel roadbed connection structure according to any one of claims 1 to 9.

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