CN109868691B - Deformation-adjustable high-speed railway roadbed structure, construction method and settlement deformation adjustment method - Google Patents
Deformation-adjustable high-speed railway roadbed structure, construction method and settlement deformation adjustment method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 22
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- 239000011150 reinforced concrete Substances 0.000 claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims description 9
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- 239000000463 material Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
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Abstract
The deformation-adjustable high-speed railway roadbed structure, the construction method and the settlement deformation adjustment method can be used for conveniently adjusting and repairing the roadbed deformation, meeting the requirements of high-speed railways, particularly ballastless track railways, on roadbed deformation control, greatly reducing the roadbed construction cost of the high-speed railways and reducing the roadbed land to the greatest extent. Reinforced concrete box frame sections are continuously arranged on the foundation along the line direction, and expansion joints are arranged between the end faces of adjacent reinforced concrete box frame sections. Each reinforced concrete box frame section comprises a U-shaped section structure body formed by a left vertical arm wall, a right vertical arm wall and a bottom plate, and a top structure body formed by a top plate and an adjusting support beam, wherein the adjusting support beams are arranged at intervals along the length direction of the top plate and fixedly connected to the bottom surface of the top plate. The upper ends of the left vertical arm wall and the right vertical arm wall are provided with positioning notches at intervals along the length direction, and the two ends of each adjusting support beam are positioned in the corresponding positioning notches.
Description
Technical Field
The invention relates to a railway roadbed structure, in particular to a deformation-adjustable high-speed railway roadbed structure, a construction method and a roadbed deformation adjustment method.
Background
The railway roadbed is generally filled with a certain specification of filling materials, the top surface of the embankment is a foundation of a track system, drainage ditches are arranged outside slope surfaces on two sides of the embankment, the floor area of the roadbed is large, and in order to meet the smoothness of a line of a high-speed railway, the filling materials of the roadbed have very strict requirements, high-quality filling materials are needed to be filled, and because the filling weight of the high-quality filling materials is large, reinforcing treatment measures are needed to be carried out on a soil foundation, so that the roadbed is high in construction cost.
The deformation control of the high-speed railway, particularly the ballastless track railway, on the roadbed is very strict, when the roadbed of the high-speed railway is subjected to settlement deformation, the conventional embankment is often difficult to repair, the construction efficiency is very low, and the repair cost is high. Therefore, a new roadbed structure is needed to be provided, and the roadbed structure has the characteristics of adjustable deformation, economy, convenient construction, safety, environmental protection and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the high-speed railway roadbed structure with adjustable deformation, so that the roadbed deformation can be conveniently adjusted and repaired, the requirement of a high-speed railway, particularly a ballastless track railway, on roadbed deformation control is met, the roadbed construction cost of the high-speed railway is greatly reduced, and the roadbed land is furthest reduced.
The technical scheme adopted for solving the technical problems is as follows:
the invention relates to a deformation-adjustable high-speed railway roadbed structure, which comprises a foundation and is characterized in that: the reinforced concrete box-shaped frame sections are continuously arranged on the foundation along the line direction, and expansion joints are arranged between the end faces of adjacent reinforced concrete box-shaped frame sections; each reinforced concrete box-shaped frame section comprises a U-shaped section structure body formed by a left vertical arm wall, a right vertical arm wall and a bottom plate, and a top structure body formed by a top plate and an adjusting support beam, wherein the adjusting support beams are arranged at intervals along the length direction of the top plate and fixedly connected to the bottom surface of the top plate; the upper ends of the left vertical arm wall and the right vertical arm wall are provided with positioning notches at intervals along the length direction, and the two ends of each adjusting support beam are located in the corresponding positioning notches.
The invention provides a construction method of the deformation-adjustable high-speed railway roadbed structure, which comprises the following steps:
(1) leveling the foundation;
(2) pouring each reinforced concrete box frame section according to the following sequence:
pouring reinforced concrete of the bottom plate, reserving main steel bars at corresponding positions of the left vertical arm wall and the right vertical arm wall, wherein the reserved length of the main steel bars is not less than 1.5m, and meeting the requirements of steel bar joints;
before the initial setting of the bottom plate concrete, constructing left side vertical arm wall and right side vertical arm wall reinforced concrete, and forming positioning notches at the upper ends of the left side vertical arm wall and the right side vertical arm wall reinforced concrete;
constructing adjusting support beams at the positions of the corresponding positioning notch on the left vertical arm wall and the right vertical arm wall, and pre-burying connecting steel bars with the top surface of 0.3-0.5m exposed in the adjusting support beams;
constructing reinforced concrete of a top plate, wherein the reinforced concrete of the top plate is fixedly connected with the connecting reinforced concrete of the lower adjusting supporting beam;
(3) and filling asphalt planks or adhesives between the end faces of adjacent reinforced concrete box frame sections to finish the construction of the expansion joints.
The invention provides a settlement deformation adjusting method for a high-speed railway roadbed structure with adjustable deformation, which comprises the following steps:
(1) determining a top plate lifting range and a lifting height;
(2) arranging hydraulic jacks on the bottom plate within the lifting range, wherein the upper ends of the vertical arms of the hydraulic jacks are in close contact with corresponding adjusting support beams;
(3) starting a hydraulic jack, and slowly lifting and adjusting the supporting beam;
(4) the top plate is lifted to a lifting height, the pressure value of the hydraulic jack is kept, heightening cushion blocks are arranged between the adjusting support beam and the positioning notch of the left vertical arm wall and the right vertical arm wall, and the heightening cushion blocks are arranged in gaps between the top surfaces of the left vertical arm wall and the right vertical arm wall and the bottom surface of the top plate;
(5) and (5) retracting the vertical arm of the hydraulic jack to finish settlement deformation adjustment construction.
The invention has the beneficial effects that the reinforced concrete box-shaped frame structure is used for replacing the traditional roadbed, engineering measures such as roadbed filling, roadbed slope protection, roadbed drainage and the like are replaced, the structure is light in weight and small in width, and engineering land and soil foundation reinforcement measures are greatly saved, so that the total engineering investment is greatly reduced; an adjusting support beam in the reinforced concrete box frame structure is in surface contact with the side arm and the top plate to provide conditions for settlement deformation and lifting adjustment; the adjusting support beams are rigidly connected with the upper top plate structure, so that the coordination of deformation of the adjusting support beams and the upper top plate structure is ensured, the stress condition of the top plate is improved by the adjusting support beams arranged at intervals, and the consumption of reinforced concrete of the top plate can be saved; the adjusting support beam is fixedly connected with the vertical arm wall positioning notch through the guide boss, so that the fixing constraint of the adjusting support beam and the upper top plate in the transverse direction and the longitudinal direction of the roadbed is ensured. The roadbed deformation can be conveniently adjusted and repaired, the requirement of a high-speed railway, particularly a ballastless track railway, on roadbed deformation control is met, and the roadbed deformation control method has the characteristics of simplicity in construction and low engineering investment, has popularization and application prospects, and meets the requirement of environmental protection.
Drawings
The specification includes the following three drawings:
FIG. 1 is a cross-sectional view of a deformation-adjustable high-speed railway subgrade structure of the present invention;
FIG. 2 is a cross-sectional view taken along line C-C of FIG. 1;
fig. 3 is a schematic diagram of a deformation-adjustable high-speed railway roadbed structure adjustment deformation of the present invention.
The components and corresponding indicia are shown: the floor 11, the left vertical arm wall 12, the right vertical arm wall 13, the top plate 14, the adjusting support beam 15, the guide boss 151, the expansion joint 20, the hydraulic jack 30, the foundation A and the ground line B.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Referring to fig. 1 and 2, a deformation-adjustable high-speed railway roadbed structure of the present invention comprises a foundation a, wherein reinforced concrete box frame sections are continuously arranged on the foundation a along the line direction, and expansion joints 20 are arranged between the end surfaces of adjacent reinforced concrete box frame sections; each reinforced concrete box frame section comprises a U-shaped section structure body formed by a left vertical arm wall 12, a right vertical arm wall 13 and a bottom plate 11, and a top structure body formed by a top plate 14 and an adjusting support beam 15, wherein the adjusting support beams 15 are arranged at intervals along the length direction of the top plate 14 and fixedly connected to the bottom surface of the top structure body, positioning notch openings are arranged at intervals along the length direction of the upper end of the right vertical arm wall 13 of the left vertical arm wall 12, and two ends of each adjusting support beam 15 are located in the corresponding positioning notch openings.
Referring to fig. 1, the bottom surfaces of the positioning slots form surface contact supports for the bottom surfaces of the adjusting support beams 15, and the top surfaces of the left side vertical arm wall 12 and the right side vertical arm wall 13 form surface contact supports for the bottom surfaces of the top plates 14. The adjusting support beam 15 is provided with a guiding boss 151 extending downwards at the inner side of the positioning notch, and the outer side wall of the guiding boss 151 is contacted with the inner side wall surfaces of the left side vertical arm wall 12 and the right side vertical arm wall 13. In general, the distance between the supporting beams 15 is 10-15m, the thickness is not less than 0.8m, the width is not less than 0.5m, and the height of the guiding boss 151 is not less than 0.3m.
Referring to fig. 1 and 2, the invention replaces the traditional roadbed with the reinforced concrete box-shaped frame structure, replaces engineering measures such as roadbed filling, roadbed slope protection, roadbed drainage and the like, has light weight and small width, and greatly saves engineering land and soil foundation reinforcement measures, thereby greatly reducing the total engineering investment. The adjusting support beam 15 in the reinforced concrete box frame structure is in surface contact with the left vertical arm wall 12 and the right vertical arm wall 13, and the left vertical arm wall 12, the right vertical arm wall 13 and the top plate 14 are in surface contact with each other, so that conditions are provided for settlement deformation lifting adjustment. The adjusting support beams 15 are rigidly connected with the upper top plate 14 structure, so that the deformation coordination of the two is ensured, the stress condition of the top plate 14 is improved by the adjusting support beams 15 arranged at intervals, and the consumption of reinforced concrete of the top plate 14 can be saved. The adjusting support beam 15 is fixedly connected with the left vertical arm wall 12 and the right vertical arm wall 13 through the guide boss 151, so that the fixing constraint of the adjusting support beam and the upper top plate 14 in the transverse direction and the longitudinal direction of the roadbed is ensured. The structure has the characteristics of adjustable deformation and repair, simple construction and low engineering investment, has popularization and application prospects, and meets the requirement of environmental protection.
Referring to fig. 1, the construction method of the deformation-adjustable high-speed railway roadbed structure of the present invention comprises the following steps:
(1) leveling the foundation A;
(2) pouring each reinforced concrete box frame section according to the following sequence:
2.1, pouring reinforced concrete of the bottom plate 11, reserving main reinforcing steel bars at corresponding positions of the left vertical arm wall 12 and the right vertical arm wall 13, wherein the reserved length of the main reinforcing steel bars is not less than 1.5m, and meeting the requirement of reinforcing steel bar joints;
2.2, constructing reinforced concrete of the left vertical arm wall 12 and the right vertical arm wall 13 before the initial setting of the concrete of the bottom plate 11, and forming positioning notches at the upper ends of the left vertical arm wall and the right vertical arm wall;
2.3, constructing an adjusting support beam 15 at the corresponding positioning notch positions on the left vertical arm wall 12 and the right vertical arm wall 13, and embedding connecting steel bars with the top surface of 0.3-0.5m exposed in the adjusting support beam 15;
2.4 constructing reinforced concrete of the top plate 14, wherein the reinforced concrete of the top plate 14 is fixedly connected with the connecting reinforced concrete of the lower adjusting support beam 15;
(3) asphalt planks or adhesives are stuffed between the end faces of adjacent reinforced concrete box frame segments to complete the construction of the expansion joints 20.
In the step (1), the foundation a is leveled in a step-like manner when the ground has a gradient, so that the top plates 14 of the reinforced concrete box-shaped frame sections are positioned at the same plane elevation.
Referring to fig. 3, the settlement deformation adjustment method of the deformation-adjustable high-speed railway roadbed structure provided by the invention comprises the following steps:
(1) determining the lifting range and the lifting height of the top plate 14;
(2) arranging hydraulic jacks 30 on the bottom plate 11 within the lifting range, wherein the upper ends of the vertical arms of the hydraulic jacks 30 are in close contact with the corresponding adjusting support beams 15;
(3) starting a hydraulic jack 30, slowly lifting the adjusting support beam 15, wherein the lifting speed is not higher than 0.05 m/min;
(4) the top plate 14 is lifted to a lifting height, the pressure value of the hydraulic jack 30 is kept, heightening cushion blocks are arranged between the adjusting support beam 15 and the positioning notch of the left vertical arm wall 12 and the right vertical arm wall 13, and the heightening cushion blocks are arranged in gaps between the top surfaces of the left vertical arm wall 12 and the right vertical arm wall 13 and the bottom surface of the top plate 4;
(5) and (5) withdrawing the vertical arm of the hydraulic jack 30 to finish settlement deformation adjustment construction.
The technical and economic effects of the invention are described below by taking the design of a ballastless track high-speed railway embankment project as an example:
the embankment engineering has a filling height of 7m, a foundation soil layer thickness of 15m, an embankment length of 500m, and a high-quality filling distance of 50Km (containing graded broken stone on the surface of roadbed, and average price of about 160 yuan/m) 3 ) Land cost is 15 ten thousand yuan/mu. Scheme I is a traditional roadbed, and the section of the filler is 171.5m 2 The foundation is treated by CFG piles, the treatment width is 35m, the depth is 15mm, the pile spacing is 1.6m, the land width is 45m, the slope protection cost is 800 yuan/m, and the section area of the drainage ditch is 1.3m 2 The method comprises the steps of carrying out a first treatment on the surface of the Scheme II adopts the deformation-adjustable high-speed railway roadbed structure, and the reinforced concrete sectional area is 14.5m 2 The treatment width of the foundation CFG pile is 13m, the depth is 15mm, the pile spacing is 2.2m, and the land width is 17m.
(1) The project cost of the scheme I is calculated as follows:
price of filler: 171.5m 2 *500m 160 yuan/m 3 =1372 ten thousand yuan
Foundation CFG pile engineering cost: 35m 500m 15m/1.6m 140 m/m= 1435.6 ten thousand yuan
Land cost: 45m x 500m/666.7 x 15 ten thousand yuan/mu=506.2 ten thousand yuan
Drain cost: 1.3m 2 *500m x 400 yuan/m 3 =26 ten thousand yuan
Slope protection cost: 800 yuan/m 500 m=40 ten thousand yuan
The engineering cost is calculated together: 3379.8 ten thousand yuan
(2) Scheme II the project cost is calculated as follows:
price of reinforced concrete = 14.5m 2 *500m 1300 yuan/m 3 =942.5 ten thousand yuan
Foundation CFG pile engineering cost: 13m 500m 15m/2.2m 140 yuan/m= 282.0 ten thousand yuan
Land cost: 17m x 500m/666.7 x 15 ten thousand yuan/mu=191.2 ten thousand yuan
The project cost is calculated as follows: 1415.7 ten thousand yuan
Compared with the traditional roadbed of the scheme I, the box-type roadbed of the scheme II can save 1964.1 ten thousand yuan, the investment saving ratio is 58.1%, the roadbed can be saved by 21 mu, and the economic and ecological benefits are very remarkable. In addition, the invention can conveniently adjust and repair the roadbed deformation, meets the requirement of high-speed railways, particularly ballastless track railways, on roadbed deformation control, has the characteristics of simple construction and low engineering investment, has popularization and application prospects, and meets the requirement of environmental protection.
The foregoing is provided for the purpose of illustrating the principles of the present invention and is not intended to limit the invention to the particular structure and application scope of the invention shown and described, but is to be accorded the full range of possible modifications and equivalent structures.
Claims (8)
1. The utility model provides a deformation adjustable high-speed railway roadbed structure, includes ground (A), characterized by: the reinforced concrete box-shaped frame sections are continuously arranged on the foundation (A) along the line direction, and expansion joints (20) are arranged between the end faces of adjacent reinforced concrete box-shaped frame sections; each reinforced concrete box-shaped frame section comprises a U-shaped section structure body formed by a left vertical arm wall (12), a right vertical arm wall (13) and a bottom plate (11), and a top structure body formed by a top plate (14) and an adjusting support beam (15), wherein the adjusting support beams (15) are arranged at intervals along the length direction of the top plate (14) and are fixedly connected to the bottom surface of the top structure body; the upper ends of the left vertical arm wall (12) and the right vertical arm wall (13) are provided with positioning notches at intervals along the length direction, and the two ends of each adjusting support beam (15) are located in the corresponding positioning notches.
2. The deformation-adjustable high-speed railway roadbed structure according to claim 1, wherein: the bottom surface of the positioning notch forms surface contact support on the bottom surface of the adjusting support beam (15), and the top surfaces of the left side vertical arm wall (12) and the right side vertical arm wall (13) form surface contact support on the bottom surface of the top plate (14).
3. The deformation-adjustable high-speed railway roadbed structure according to claim 2, wherein: the adjusting support beam (15) is provided with a guide boss (151) extending downwards at the inner side of the positioning notch, and the outer side wall of the guide boss (151) is contacted with the inner side wall surfaces of the left vertical arm wall (12) and the right vertical arm wall (13).
4. A deformation-adjustable high-speed railway subgrade structure as claimed in claim 3, wherein: the arrangement distance of the adjusting support beams (15) is 10-15m, the thickness of the adjusting support beams is not smaller than 0.8m, the width of the adjusting support beams is not smaller than 0.5m, and the height of the guiding boss (151) is not smaller than 0.3m.
5. A construction method of a deformation-adjustable high-speed railway roadbed structure according to any one of claims 1 to 4, comprising the steps of:
(1) leveling the foundation (A);
(2) pouring each reinforced concrete box frame section according to the following sequence:
2.1, pouring reinforced concrete of the bottom plate (11), reserving main steel bars at corresponding positions of the left vertical arm wall (12) and the right vertical arm wall (13), wherein the reserved length of the main steel bars is not less than 1.5m, and meeting the requirements of steel bar joints;
2.2, constructing reinforced concrete of a left vertical arm wall (12) and a right vertical arm wall (13) before initial setting of the concrete of the bottom plate (11), and forming positioning notches at the upper ends of the left vertical arm wall and the right vertical arm wall;
2.3, constructing an adjusting support beam (15) at the corresponding positioning notch positions on the left vertical arm wall (12) and the right vertical arm wall (13), and embedding connecting steel bars with the top surface of 0.3-0.5m exposed in the adjusting support beam (15);
2.4 constructing reinforced concrete of the top plate (14), wherein the reinforced concrete of the top plate (14) is fixedly connected with the connecting reinforced concrete of the lower adjusting support beam (15);
(3) and filling asphalt planks or adhesives between the end faces of adjacent reinforced concrete box frame sections to finish the construction of the expansion joint (20).
6. The construction method of the deformation-adjustable high-speed railway roadbed structure according to claim 5, which is characterized in that: in the step (1), when the ground has a gradient, the foundation (A) is leveled according to steps, so that the top plates (14) of the reinforced concrete box-shaped frame sections are positioned at the same plane elevation.
7. A settlement deformation adjustment method using the deformation-adjustable high-speed railway roadbed structure according to any one of claims 1 to 4, comprising the steps of:
(1) determining the lifting range and the lifting height of the top plate (14);
(2) arranging hydraulic jacks (30) on the bottom plate (11) within the lifting range, wherein the upper ends of the vertical arms of the hydraulic jacks (30) are in close contact with corresponding adjusting support beams (15);
(3) starting a hydraulic jack (30) and slowly lifting the adjusting support beam (15);
(4) the top plate (14) is lifted to a lifting height, the pressure value of the hydraulic jack (30) is kept, heightening cushion blocks are arranged between the adjusting support beam (15) and the positioning notch of the left vertical arm wall (12) and the positioning notch of the right vertical arm wall (13), and the heightening cushion blocks are arranged in gaps between the top surfaces of the left vertical arm wall (12) and the right vertical arm wall (13) and the bottom surface of the top plate (14);
(5) and (5) withdrawing the vertical arm of the hydraulic jack (30) to finish the settlement deformation adjustment construction.
8. The settlement deformation adjustment method for the deformation-adjustable high-speed railway roadbed structure according to claim 7, which is characterized in that: in the step (3), the lifting speed of the supporting beam (15) is adjusted to be not higher than 0.05 m/min.
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| CN111218859A (en) * | 2020-03-02 | 2020-06-02 | 中铁二院工程集团有限责任公司 | Ballastless track cutting structure, system and construction method for expansive and contractive deformation foundation |
| CN111218860A (en) * | 2020-03-02 | 2020-06-02 | 中铁二院工程集团有限责任公司 | Ballastless track railway deformation adjusting embankment structure and construction method |
| CN111400806B (en) * | 2020-03-25 | 2022-07-08 | 中铁二院工程集团有限责任公司 | Anti-bump wide roadbed structure next to ballastless railway, roadbed system and design method |
| CN114606803A (en) * | 2021-12-17 | 2022-06-10 | 中铁二院工程集团有限责任公司 | Height-adjustable composite high-speed railway roadbed structure and design method thereof |
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