Construction method for stepped integral shoulder structure of high-speed railway

Abstract

A construction method for a stepped integral shoulder structure of high-speed railway, which can effectively solve the technical problems such as cumbersome construction, poor sealing, poor drainage, inconvenient maintenance and investment saving of the shoulder structure of high-speed railway, and is economically reasonable, which is beneficial to reducing the engineering construction cost. The cast-in-place stepped water retaining edge of the shoulder structure includes a water retaining edge plate body, a water retaining edge step and a water retaining edge structure. The water retaining edge plate body is located on the top surface of the subgrade bed. The water retaining edge structure is located at the outer end of the water retaining edge plate body. The water retaining edge step protrudes upward from the top surface of the water retaining edge plate body; the cable trench structure is assembled by precast cable trench segments connected longitudinally. The precast cable trench segment has a cable trench drain hole that communicates with the bottom of the cable trench inside it and leads to the outside of the cable trench main body; the precast cable trench segment is located on the water retaining edge plate body inside the water retaining edge step and is close to the inside of the water retaining edge step. A composite drainage net is laid between its bottom surface and the top surface of the water retaining edge plate body, and the top surface of the water retaining edge step is flush with the bottom end of the cable trench drain hole.

Description

Technical Field

[0001] The present invention relates to a railway subgrade, and particularly to a construction method for a stepped integral shoulder structure of a high-speed railway. Background Art

[0002] During the rapid construction and long-term operation of high-speed railways in China, the shoulders on both sides of the subgrade usually consist of cable troughs and the outer shoulders. Various cables are laid in the cable troughs, and drain holes are opened to communicate with the shoulder drain holes to drain the rainwater seeping into the cable troughs on the subgrade surface. Permeable gravel is provided at the bottom to drain the seepage water in the surface layer of the subgrade bed. Such a structure has the problem that it is difficult to accurately align the drain holes in the cable trough with the shoulder drain holes, and the rainwater in the cable trough is easily blocked; moreover, it is necessary to cut on the well-compacted surface layer of the subgrade bed, and only after the permeable gravel layer and the cement mortar leveling layer are constructed can the installation be carried out. Its construction process is cumbersome, and problems such as uneven cutting surfaces and loosening of adjacent graded gravel often occur, which easily causes rainwater to seep into the bottom layer of the subgrade bed and cause diseases; later, the construction method of first constructing the basic surface layer by formwork erection and then constructing the cable trough and the shoulder was proposed. Although it avoids cutting the basic surface layer, there are still problems such as poor sealing between the cable trough and the surface layer of the subgrade bed, cumbersome processes, and secondary transfer of the formwork. In addition, when laying cables according to the current cable trough dimensions, there are many layers, which is not convenient for maintenance. If such a structure is used to increase the net width of the cable trough, it is necessary to increase the width of the subgrade surface, increasing the investment; and the shoulders are relatively high, which is not convenient for railway maintenance personnel to get on and off the shoulders.

[0003] Therefore, there is an urgent need for a railway shoulder structure with simple construction, good drainage effect, convenient maintenance, convenient widening of the cable trough size, and low cost, which has a popularization and application prospect, to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for a stepped integral shoulder structure of a high-speed railway, so as to effectively solve the technical problems such as cumbersome construction, poor sealing, poor drainage, inconvenient maintenance and investment saving of the high-speed railway shoulder structure, and moreover, it is economically reasonable and beneficial to reduce the engineering construction cost.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] Construction method of a stepped integral shoulder structure for high-speed railways. The shoulder structure includes a cable trench structure and a shoulder structure arranged on the outer sides of the transverse two sides of the surface layer of the subgrade bed. The shoulder structure is a cast-in-place stepped water retaining edge, including a water retaining edge plate body, a water retaining edge step and a water retaining edge structure. The water retaining edge plate body is located on the top surface of the bottom layer of the subgrade bed, the water retaining edge structure is located at the outer end of the water retaining edge plate body, and the water retaining edge step protrudes upward from the top surface of the water retaining edge plate body; the cable trench structure is assembled by precast cable trench segments connected longitudinally. The precast cable trench segments have cable trench drain holes that communicate with the bottom of the cable trench inside and lead to the outside of the cable trench main body; the precast cable trench segments are located on the water retaining edge plate body inside the water retaining edge step and close to the inner side of the water retaining edge step. A composite drainage net is laid between the bottom surface and the top surface of the water retaining edge plate body, and the top surface of the water retaining edge step is flush with the bottom end of the cable trench drain hole;

[0007] The construction method includes the following steps:

[0008] S01. Fill the bottom layer of the subgrade bed in layers according to a certain thickness;

[0009] S02. Roll and level the top surface of the bottom layer of the subgrade bed to form a 4% outward transverse drainage slope;

[0010] S03. Cast the cast-in-place stepped water retaining edge integrally on the top surface of the bottom layer of the subgrade bed. Drainage grooves and construction joints are arranged on the cast-in-place stepped water retaining edge and the water retaining edge step respectively at certain intervals;

[0011] S04. Lay a composite drainage net between the inner side of the water retaining edge step and the inner end of the water retaining edge plate body on the top surface of the water retaining edge plate body;

[0012] S05. Install precast cable trench segments on the composite drainage net close to the inner side of the water retaining edge step;

[0013] S06. Fill the surface layer of the subgrade bed in layers according to a certain thickness. Except for the range within 1.3 m adjacent to the precast cable trench segments, which is rolled by small machinery, the remaining positions are rolled by large machinery.

[0014] In the above technical solution:

[0015] The precast cable trench segment is composed of a cable trench main body and a cover plate. The cable trench main body consists of a thickened bottom plate, thickened outer walls on both sides and internal partitions. The internal partitions divide at least two longitudinally extending cable trenches inside the cable trench main body; the cable trench drain holes are arranged at the bottom of the cable trench and pass through the thickened outer wall on the outside.

[0016] The inner end of the water retaining edge plate body extends inward a certain width beyond the thickened outer wall on the inner side of the cable trench main body.

[0017] The beneficial effects of the present invention are mainly reflected in the following aspects:

[0018] 1. Adopt a stepped integral shoulder structure. By increasing the thickness of the outer wall and bottom plate of the cable trough, it jointly bears force with the stepped water retaining edge, improving the structural stiffness and overall anti-slip performance. This enables it to be set before the basic surface rolling and meet the rolling conditions, avoiding the cumbersome procedures of temporarily erecting formwork for the subgrade surface layer, or first constructing the subgrade surface layer, then cutting the graded crushed stone, and then filling the permeable gravel and cement mortar layer, and finally constructing the cable trough and shoulder.

[0019] 2. Set the height of the water retaining edge step flush with the bottom surface of the drain hole in the cable trough, which can directly drain the rainwater in the cable trough, effectively solve the problem of inaccurate alignment of the drain holes in the cable trough and the shoulder, avoid water accumulation in the cable trough, and can utilize the upper and lower shoulders of the step to effectively solve the problem of inconvenient railway maintenance.

[0020] 3. By effectively utilizing the width of the water retaining edge platform, the requirement of increasing the net width of the cable trough can be met without increasing the width of the subgrade surface, saving a large amount of earthwork and land use.

[0021] The present invention can not only effectively solve the problems such as cumbersome cable trough construction, poor sealing, poor drainage, and inconvenient maintenance, but also be economically reasonable and have broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] This specification includes the following four drawings:

[0023] Figure 1 is a schematic diagram of the installation position of a stepped integral shoulder structure of a high-speed railway according to the present invention in an embankment section;

[0024] Figure 2 is a schematic diagram of the installation position of a stepped integral shoulder structure of a high-speed railway according to the present invention in a cutting section;

[0025] Figure 3 is a schematic diagram of a stepped integral shoulder structure of a high-speed railway according to the present invention;

[0026] Figure 4 is a front view schematic diagram of a stepped integral shoulder structure of a high-speed railway according to the present invention;

[0027] The figure shows the names of components, parts and the corresponding marks: track structure A, subgrade surface layer B, subgrade bottom layer C, catenary D, composite drainage net E, precast cable trough segment 10, cover plate 11, thickened outer wall 12, partition 13, thickened bottom plate 14, drain hole 15, cast-in-place stepped water retaining edge 20, plate body 21, step 22, water retaining edge 23, drainage trough 24, construction joint 25. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will describe the technical solution in detail with reference to the drawings and specific embodiments.

[0029] Refer toFigure 1 , Figure 2 and Figure 3 , a stepped integral shoulder structure for high - speed railway of the present invention includes a cable trough structure and a shoulder structure arranged on the outer sides of the transverse two sides of the surface layer B of the subgrade bed. The cast - in - place stepped water - retaining edge 20 of the shoulder structure includes a water - retaining edge plate body 21, a water - retaining edge step 22 and a water - retaining edge structure 23. The water - retaining edge plate body 21 is located on the top surface of the subgrade bed bottom layer C, the water - retaining edge structure 23 is located at the outer end of the water - retaining edge plate body 21, and the water - retaining edge step 22 protrudes upward from the top surface of the water - retaining edge plate body 21. The cable trough structure is assembled by precast cable trough segments 10 connected longitudinally. The precast cable trough segment 10 has a cable trough drain hole 15 that communicates with the bottom of the cable trough inside and leads to the outside of the cable trough main body. The precast cable trough segment 10 is located on the water - retaining edge plate body 21 inside the water - retaining edge step 22 and is close to the inside of the water - retaining edge step 22. That is, by adopting the stepped integral shoulder structure, by increasing the thickness of the outer wall and the bottom plate of the cable trough and jointly bearing the force with the stepped water - retaining edge, the structural stiffness and the overall anti - slip performance are improved, enabling it to be set before the compaction of the basic surface layer and meeting the compaction conditions, and avoiding the cumbersome procedures of temporarily erecting formwork for the construction of the subgrade surface layer, or first constructing the subgrade surface layer, then cutting graded crushed stone, and then filling permeable gravel and cement mortar layers, and finally constructing the cable trough and the shoulder.

[0030] Referring to Figure 3 , the precast cable trough segment 10 is composed of a cable trough main body and a cover plate 11. The cable trough main body consists of a thickened bottom plate 14, thickened outer walls 12 on both sides and an internal partition 13. The internal partition 13 divides at least two longitudinally extending cable troughs inside the cable trough main body. The cable trough drain hole 15 is arranged at the bottom of the cable trough and passes through the thickened outer wall 12 on the outside. A composite drainage net E is laid between the bottom surface of the precast cable trough segment 10 and the top surface of the water - retaining edge plate body 21. The top surface of the water - retaining edge step 22 is flush with the bottom end of the cable trough drain hole 15, which can directly drain the rainwater in the cable trough to effectively solve the problem that it is difficult to accurately align the drain holes of the cable trough and the shoulder, avoid water accumulation in the cable trough, and can utilize the upper and lower shoulders of the steps to effectively solve the problem of inconvenient railway maintenance. Moreover, by effectively using the width of the water - retaining edge platform, the requirement of increasing the net width of the cable trough is met without increasing the width of the subgrade surface, so as to save a large amount of earthwork and land use.

[0031] Referring to Figure 3 , the inner end of the water - retaining edge plate body 21 extends inward beyond the thickened outer wall 12 on the inner side of the cable trough main body by a certain width to prevent rainwater from seeping along the inner wall of the cable trough into the subgrade bed bottom layer.

[0032] Referring to Figure 4 , the cast - in - place stepped water - retaining edge 20 and the water - retaining edge step 22 are respectively provided with drainage grooves 24 and construction joints 25 at certain intervals.

[0033] Referring to Figures 1 to 4, A construction method for a stepped integral shoulder structure of a high-speed railway according to the present invention includes the following steps:

[0034] S01. Fill the subgrade bed course bottom layer C in layers with a certain thickness.

[0035] S02. Roll and level the top surface of the subgrade bed course bottom layer C to form a 4% outward cross slope.

[0036] S03. Integrally pour the cast-in-place stepped water retaining edge 20 on the top surface of the subgrade bed course bottom layer C. Drainage grooves 24 and construction joints 25 are respectively arranged at certain distances on the cast-in-place stepped water retaining edge 20 and the water retaining edge steps 22.

[0037] S04. Lay the composite drainage net E between the inner side of the water retaining edge steps 22 and the inner end of the water retaining edge plate body 21 on the top surface of the water retaining edge plate body 21.

[0038] S05. Install the precast cable trough section 10 on the composite drainage net E closely inside the water retaining edge steps 22.

[0039] S06. Fill the subgrade surface layer B in layers with a certain thickness. Except for the range within 1.3 m adjacent to the precast cable trough section 10, large machinery is used for rolling at other positions, and small machinery is used for rolling within this range.

[0040] In the step S03, the inner end of the cast-in-place stepped water retaining edge 20 is 0.05 m away from the catenary D foundation, and the inner end of the water retaining edge plate body 21 extends 0.05 m inward beyond the thickened outer wall 12 inside the main body of the cable trough.

[0041] The above is only to illustrate some principles of a construction method for a stepped integral shoulder structure of a high-speed railway according to the present invention with diagrams, and it is not intended to limit the present invention to the specific structures and applicable ranges shown and described. Therefore, all possible corresponding modifications and equivalents that can be utilized belong to the scope of the patent applied for by the present invention.

Claims

1. Construction method of a stepped integral shoulder structure for high-speed railway. The shoulder structure includes a cable trough structure and a shoulder structure arranged on the outer sides of the transverse two sides of the surface layer (B) of the subgrade bed. The shoulder structure is cast-in-place with a stepped water retaining edge (20), including a water retaining edge plate body (21), a water retaining edge step (22) and a water retaining edge structure (23). The water retaining edge plate body (21) is located on the top surface of the bottom layer C of the subgrade bed. The water retaining edge structure (23) is located at the outer end of the water retaining edge plate body (21). The water retaining edge step (22) protrudes upward from the top surface of the water retaining edge plate body (21). The cable trough structure is assembled by precast cable trough segments (10) longitudinally butted. The precast cable trough segment (10) has a cable trough drain hole (15) that communicates with the bottom of the cable trough inside it and leads to the outside of the cable trough main body. The precast cable trough segment (10) is located on the water retaining edge plate body (21) inside the water retaining edge step (22) and is close to the inside of the water retaining edge step (22). A composite drainage net (E) is laid between its bottom surface and the top surface of the water retaining edge plate body (21). The top surface of the water retaining edge step (22) is flush with the bottom end of the cable trough drain hole (15). The construction method includes the following steps: S01. Fill the bottom layer (C) of the subgrade bed in layers according to a certain thickness. S02. Roll and level the top surface of the bottom layer (C) of the subgrade bed to form a 4% outward transverse drainage slope. S03. Cast-in-place the stepped water retaining edge (20) integrally on the top surface of the bottom layer (C) of the subgrade bed. The stepped water retaining edge (20) and the water retaining edge step (22) are respectively provided with drainage grooves (24) and construction joints (25) at certain intervals. S04. Lay a composite drainage net (E) between the inner side of the water retaining edge step (22) and the inner end of the water retaining edge plate body (21) on the top surface of the water retaining edge plate body (21). S05. Install the precast cable trough segment (10) on the composite drainage net (E) close to the inside of the water retaining edge step (22). S06. Fill the surface layer (B) of the subgrade bed in layers according to a certain thickness. Except for the area within 1.3 m adjacent to the precast cable trough segment (10), large mechanical rolling is used for the rest of the positions.

2. The construction method of a stepped integral shoulder structure for high-speed railway as described in claim 1, characterized in that: The precast cable trough segment (10) is composed of a cable trough main body and a cover plate (11). The cable trough main body consists of a thickened bottom plate (14), thickened outer walls (12) on both sides and an internal partition (13). The internal partition (13) divides at least two longitudinally extending cable troughs inside the cable trough main body. The cable trough drain hole (15) is arranged at the bottom of the cable trough and passes through the thickened outer wall (12) on the outside.

3. The construction method of a stepped integral shoulder structure for high-speed railway as described in claim 1, characterized in that: The inner end of the water retaining edge plate body (21) extends inward a certain width beyond the thickened outer wall (12) inside the cable trough main body.

4. The construction method of a stepped integral shoulder structure for high-speed railway as described in claim 1, characterized in that: The cast-in-place stepped water retaining edge (20) and the water retaining edge step (22) are respectively provided with drainage grooves (24) and construction joints (25) at certain intervals.

5. The construction method of a stepped integral shoulder structure for high-speed railways as described in claim 1, characterized in that: in the step S03, the inner end of the cast-in-place stepped water retaining edge (20) is 0.05 m away from the foundation of the catenary (D), and the inner end of the water retaining edge plate body (21) extends 0.05 m in width inward beyond the thickened outer wall (12) on the inner side of the main cable trough.

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