Anti-skid box type roadbed suitable for road and bridge transition section

Abstract

The utility model discloses an anti-skidding box type roadbed suitable for a road and bridge transition section, which is arranged on a foundation between a bridge and a roadbed and is characterized by comprising a box body and a plurality of column feet, the box body is enclosed by a top plate, two side walls, a bottom plate and an inclined plate, one side of the box body is open, and the column feet are arranged on the bottom surface of the bottom plate. The top surface of the foundation is connected with a bridge floor; the bottom plate is as long as the top plate; the top end of the inclined plate is connected with the edge of the top plate; the bottom plate is divided into a box body part and an extension part by the bottom end of the inclined plate; the extension part is inserted into the roadbed; the opening side of a box body of the anti-skid box type roadbed is connected with a bridge abutment of a bridge, and the column foot is in an inverted circular truncated cone shape and is embedded in the foundation. The problem of uneven settlement of the road-bridge transition section under the long-term train load effect is efficiently solved, the phenomenon of bumping at the bridge head is avoided, and the long-term stability and safety of a railway are improved.

Description

Technical Field

[0001] This utility model relates to the field of railway engineering structural design, and in particular to an anti-slip box-type roadbed suitable for road-bridge transition sections. Background Technology

[0002] In the transition section between the roadbed and bridge of high-speed railways, a transition section is usually set up between the two to ensure a smooth transition of track stiffness at the interface. However, under long-term train loads, uneven settlement of the road-bridge transition section still exists, frequently resulting in bridge approach slab settlement, which seriously affects the long-term stability and safety of the railway. Common remedial measures for these problems in road-bridge transition sections mainly focus on the following aspects:

[0003] 1. Construction materials and process control: Selecting permeable materials with a large internal friction angle for filling the bridge abutments makes it easier to control the compaction quality and reduce the compression settlement of the roadbed;

[0004] 2. Special structural treatment of the bridge approach pavement: measures such as setting sleeper beams and approach slabs as well as thickened embedded plates are used to achieve a smooth and gradual transition in terms of structure, materials, rigidity and flexibility, expansion and contraction;

[0005] 3. Reinforced soil embankment structure technology: A certain amount of reinforcing material is buried in the road-bridge transition section to improve the overall strength of the reinforced soil, limit overall deformation, and reduce settlement;

[0006] 4. Transition slab installation technology: Reinforced concrete slabs are installed on the embankment within the transition section between road and bridge to reduce the bending angle of the rail surface and increase the rigidity of the rail.

[0007] Traditional road-bridge transition section treatment techniques often disturb the roadbed and the bridge itself, leading to negative pressure problems caused by settlement differences, which in turn cause mud pumping and frost in the road-bridge transition section. These techniques cannot effectively solve the problem of uneven settlement in the road-bridge transition section. Utility Model Content

[0008] To address the problems in the background art, this utility model proposes an anti-slip box-type roadbed suitable for road-bridge transition sections, which can solve the problem of uneven settlement in road-bridge transition sections.

[0009] Therefore, the present invention adopts the following technical solution:

[0010] A type of anti-skid box-shaped roadbed suitable for road-bridge transition sections is installed on the foundation between the bridge and the roadbed. The anti-skid box-shaped roadbed includes a box-shaped body with one side opening, enclosed by a top plate, two side walls, a bottom plate, and an inclined plate, and several column bases disposed on the bottom surface of the bottom plate. Wherein:

[0011] The width of the top plate is consistent with the width of the bridge deck, and it is used to connect the top surface of the roadbed and the bridge deck;

[0012] The base plate and the top plate have the same length; the top of the inclined plate is integrally formed with the edge of the top plate, and the slope of the inclined plate ranges from [missing value].

[0013] The base plate is divided into a box-shaped portion and an extension portion by the bottom end of the inclined plate; the extension portion is inserted into the roadbed;

[0014] The opening side of the box body is connected to the abutment of the bridge, and the column base is embedded in the foundation.

[0015] Preferably, the length L of the top plate is:

[0016] L = a + (Hh) × n;

[0017] Where H is the distance between the top plate and the bottom plate, a is the length of the middle box portion of the bottom plate, h is the thickness of the bottom plate, and n is a constant determined according to the actual working conditions.

[0018] Preferably, the distance H between the top plate and the bottom plate is in the range of 3m ≤ H ≤ 8m.

[0019] Preferably, the thickness of the base plate is in the range of 0.5m ≤ h ≤ 1.5m.

[0020] Preferably, the column base is a frustum shape.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) This utility model is adapted to the road-bridge transition section, reduces the land area occupied by the road-bridge transition section, ensures that the track stiffness is smoothly transitioned at the junction of the roadbed and the bridge, effectively solves the problem of uneven settlement of the road-bridge transition section under long-term train load, avoids the phenomenon of bridgehead slab jumping, and improves the long-term stability and safety of the railway.

[0023] (2) This utility model improves the anti-slip ability of box-type roadbed by setting column feet at the bottom of the box-type roadbed; in addition, the inverted frustum-shaped column feet avoid stress concentration and also effectively avoid the problem of mud pumping caused by negative pressure at the bottom, thereby ensuring the safe and stable operation of trains in the road-bridge transition section. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle;

[0026] Figure 3 This is a schematic diagram showing the positional relationship between this utility model and the roadbed and bridge during actual assembly;

[0027] Figure 4 This is a schematic diagram of the right-side view of this utility model;

[0028] Figure 5 This is a schematic diagram of the longitudinal overturning check of this utility model;

[0029] In the diagram: 1. Top slab, 2. Side wall, 3. Bottom slab, 4. Inclined slab, 5. Column base, A. Bridge deck, B. Abutment, C. Foundation, D. Roadbed. Detailed Implementation

[0030] In order to Figure 4 Figure 5 To facilitate marking the length of the base plate, the outline of the column base has been omitted.

[0031] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 and Figure 2 As shown, the anti-skid box-type roadbed of this utility model, applicable to the transition section of a road and bridge, includes: a box-shaped structure with one side opening, formed by a top plate 1, two side walls 2, a bottom plate 3, and an inclined plate 4, and several column feet 5 set on the bottom surface of the bottom plate 3. The width of the top plate 1 is consistent with that of the bridge deck A, used to connect the road surface and the bridge deck A, ensuring smooth train operation. The top plate 1 and the bottom plate 3 have the same length. The top end of the inclined plate 4 connects to the edge of the top plate 1, and the bottom end connects to the middle of the bottom plate 3. The bottom plate 3 is divided into a box-shaped part and an extension part by the bottom end of the bottom plate 4. The bottom surface of the bottom plate 3 is connected to the foundation C. The column feet 5 are inverted frustum shapes, with the larger area of ​​the bottom surface of the frustum connected to the bottom surface of the bottom plate 3, and the smaller area of ​​the bottom surface of the frustum embedded in the foundation C.

[0033] like Figure 3 As shown, during the assembly of the anti-skid box-type roadbed of this utility model, in order to meet the requirements of its use as a transition section, one side of the inclined plate 4 is connected to the roadbed D, and the extension of the bottom plate 3 is inserted into the filling material of the roadbed D, using the self-weight of the filling material of the roadbed D to improve the stability of the entire anti-skid box-type roadbed structure; the side away from the inclined plate 4 is connected to the bridge abutment B.

[0034] like Figure 4 As shown, the connection between the anti-skid box-type roadbed and the roadbed adopts a longitudinal inverted trapezoidal shape, so the length L of the top plate (1) meets the requirements of the road-bridge transition section specification, as shown in equation (1):

[0035] L=a+(Hh)×n (1)

[0036] Where H is the height of the anti-slip box-type roadbed, 3m≤H≤8m; a is the length of the box body in the bottom plate; h is the thickness of the bottom plate, 0.5m≤h≤1.5m; and n is a constant determined according to the actual working conditions, 1≤n≤3.

[0037] like Figure 5 As shown, the length 'a' of the box section in the base plate is used to ensure that the anti-slip box-type roadbed will not overturn longitudinally when the train load is applied to the end of the top plate near the inclined plate, i.e., longitudinal overturning check.

[0038] The column bases 5 on the bottom surface of the base plate can not only improve the anti-skid properties of the anti-skid box-type roadbed, but also avoid the problem of mud pumping caused by negative pressure at the bottom, thus ensuring the safe and stable operation of trains in the road-bridge transition section; the number and arrangement of column bases are determined by the actual engineering needs and foundation conditions.

[0039] Considering the integrity of the components and the simple and uniform shape of the column bases, the construction adopts a monolithic casting method, which can be cast on-site or directly cast in a factory. Strict quality control measures are implemented during construction. After completion, longitudinal overturning performance tests are conducted on the box-type roadbed to verify the actual effectiveness of the new box-type roadbed structure.

Claims

1. A type of anti-skid box-shaped subgrade suitable for road-bridge transition sections, set on the foundation (C) between the bridge and the subgrade (D), characterized in that: The anti-slip box-type roadbed includes a box-shaped structure with one side opening, enclosed by a top plate (1), two side walls (2), a bottom plate (3), and an inclined plate (4), and several column bases (5) set on the bottom surface of the bottom plate (3), wherein: The width of the top plate (1) is consistent with the width of the bridge deck (A) of the bridge, and is used to connect the top surface of the roadbed (D) and the bridge deck (A); The bottom plate (3) and the top plate (1) have the same length; the top of the inclined plate (4) is integrally formed with the edge of the top plate (1), and the slope of the inclined plate (4) ranges from [missing information]. The base plate (3) is divided into a box-shaped part and an extension part by the bottom end of the inclined plate (4); the extension part is inserted into the roadbed (D); The box body opening side is connected to the bridge abutment (B) of the bridge, and the column foot (5) is embedded in the foundation (C).

2. The anti-slip box-type roadbed according to claim 1, characterized in that: The length L of the top plate (1) is: L = a + (Hh) × n; Wherein, H is the distance between the top plate (1) and the bottom plate (3), a is the length of the middle box part of the bottom plate (3), h is the thickness of the bottom plate (3), and n is a constant determined according to the actual working conditions.

3. The anti-slip box-type roadbed according to claim 2, characterized in that: The distance H between the top plate (1) and the bottom plate (3) is in the range of 3m ≤ H ≤ 8m.

4. The anti-slip box-type roadbed according to claim 2, characterized in that: The thickness of the base plate (3) is in the range of 0.5m≤h≤1.5m.

5. The anti-slip box-type roadbed according to claim 1, characterized in that: The column base (5) is an inverted frustum shape.

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