CN115162062A - Seamless turnout structure for arch section on roadbed and design method thereof - Google Patents
Seamless turnout structure for arch section on roadbed and design method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007704 transition Effects 0.000 claims abstract description 36
- 239000004568 cement Substances 0.000 claims abstract description 33
- 239000004575 stone Substances 0.000 claims abstract description 30
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000826860 Trapezium Species 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B7/00—Switches; Crossings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B7/00—Switches; Crossings
- E01B7/10—Frogs
- E01B7/14—Frogs with movable parts
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/227—Gutters; Channels ; Roof drainage discharge ducts set in sidewalks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/10—Prefabricated parts, e.g. composite sheet piles made of concrete or reinforced concrete
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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Abstract
The invention relates to a seamless turnout structure for an arch section on a roadbed and a design method thereof, wherein the design method comprises the following steps: determining the length of a seamless turnout structure according to the range of a high excavation section or an expansion section and the range of a turnout area; designing a span and a structural form of the seamless turnout structure; calculating and determining the size of the seamless turnout structure; determining a processing mode of a roadbed transition section; and pulling through and paving first cement graded broken stones on the roadbed, the transition section and the pile plate structure, and paving the seamless turnout on the first cement graded broken stones. According to the invention, the temperature stress is released through the transverse broken joint, the structural rigidity is smoothly transited through the transition section, the upper arch of the lower high excavation section or the expansive soil section does not influence the pile plate structure, the damage of the upper arch of the roadbed to the continuous structure is avoided, and meanwhile, the first cement graded crushed stone loaded by the roadbed, the transition section and the pile plate structure plays a role in structural continuity, so that the design requirement of a seamless turnout is met.
Description
Technical Field
The invention relates to the technical field of railway engineering, in particular to a seamless turnout structure for an arch section on a roadbed and a design method thereof.
Background
For high-speed railways, according to the requirement of laying seamless turnouts, a bridge structure in a main turnout area should be of a continuous structure, a bridge structure in a station line turnout area should be of a continuous structure, station line turnouts should not cross beam gaps, and the distance from the starting end and the terminal end of each turnout to the beam gap should not be less than 18m.
In a high excavation area, the foundation stress is released due to excavation, and the roadbed is easy to arch. In addition, if the foundation soil has expansibility, the roadbed is likely to be arched.
When the turnout is positioned in the excavation section, the turnout is easy to arch up when a roadbed is adopted, the structure is required to be continuous in order to avoid the arch-up disease, a continuous beam structure is adopted in the prior art, and if a conventional continuous beam structure is adopted, a large excavation is caused, so that the investment is increased more.
Disclosure of Invention
The invention aims to: aiming at the problems that in the prior art, when a conventional continuous beam structure is adopted to construct a seamless turnout of an upper arch section of a roadbed, a large excavation is caused, and the investment is increased more, the seamless turnout structure for the upper arch section of the roadbed and the design method thereof are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a design method of a seamless turnout structure for an arch section on a roadbed comprises the following steps:
A. determining the length a of the seamless turnout structure according to the range of the high excavation section or the expansive soil section and the range of the turnout zone;
B. designing a span and a structural form of the seamless turnout structure, dividing the seamless turnout structure into a plurality of joints along the line direction according to the value a, and arranging transverse broken joints between adjacent joints;
C. calculating and determining the size of the seamless turnout structure, wherein the length b of each connection is not more than 20m, and in order to ensure that the stress of the top surface and the bottom surface of the seamless turnout structure is basically consistent, the ratio of the side span to the mid-span is 1/4, so that the pile plate structure with the length ratio of 2: 8: 2 is determined to be arranged in the hole span of each connection;
D. determining a processing mode of a roadbed transition section, wherein the transition section is connected with a roadbed and the pile plate structure;
E. and pulling through and paving first cement graded broken stones with the thickness of 40cm-70cm on the roadbed, the transition section and the pile plate structure, and paving a seamless turnout on the first cement graded broken stones.
By adopting the design method of the seamless turnout structure for the arched section on the roadbed, the temperature stress is released through the transverse broken joint, the structural rigidity is smoothly transited through the transition section, the arching of the lower high excavation section or the expansive soil section does not influence the pile plate structure, the damage of the arching on the roadbed to the continuous structure is avoided, and meanwhile, the roadbed, the transition section and the first cement graded broken stone borne by the pile plate structure play a role in structural continuity, so that the design requirement of the seamless turnout is met.
Preferably, in step a, the length a is determined by the following formula:
a =2 × 18+2 × d + w, unit m
Wherein, w is the distance between two farthest turnout centers in the range of the section, and d is the distance from the turnout center to the starting end of the turnout.
Preferably, in the step B, after the seamless turnout structure is longitudinally divided into a plurality of joints, for the seamless turnout structure with a larger width, the seamless turnout structure is transversely divided into a plurality of blocks, a longitudinal gap is arranged between adjacent blocks, and the blocking principle is determined according to the single block transverse temperature displacement not exceeding 2 mm.
Preferably, in the step C, a flexible material filling part is provided at an upper part of the pile-plate structure.
Preferably, after the step C and before the step D, a step of providing a lateral groove on at least one of two sides of the seamless turnout structure is further included.
Preferably, after the step C and before the step D, the method further includes the steps of digging a slope below the plate of the pile plate structure and setting a blind ditch.
Preferably, in the step D, the longitudinal section of the transition section is of an inverted trapezoidal structure, the transition section comprises an upper layer and a lower layer, the lower layer is paved with second cement graded crushed stones, and the upper layer is paved with third cement graded crushed stones.
Further preferably, the length L of the transition section is determined by the following formula:
L＝c+(H-h)×n
wherein H represents the total thickness of the upper layer and the lower layer, H represents the thickness of the upper layer, c represents the length of the inverted trapezoid bottom along the line direction, and n represents the gradient coefficient.
Preferably, in the step E, the roadbed is paved with the filler in the AB group.
The invention also provides a seamless turnout structure for the arched section on the roadbed, which is designed by utilizing the design method of the seamless turnout structure for the arched section on the roadbed, the seamless turnout structure comprises a plurality of pile plate structures, the two sides of the pile plate structures along the road direction are connected with the transition section, the transition section is connected with the roadbed, the first cement graded broken stone with the thickness of 40cm-70cm is pulled through the roadbed, the transition section and the pile plate structures, and the seamless turnout is paved on the first cement graded broken stone.
By adopting the seamless turnout structure for the arched section on the roadbed, the temperature stress is released through the transverse broken joint, the structural rigidity is smoothly transited through the transition section, the pile plate structure is not influenced by the upper arch of the lower high excavation section or the expansive soil section, the damage of the upper arch of the roadbed to the continuous structure is avoided, and meanwhile, the first cement graded broken stone loaded by the roadbed, the transition section and the pile plate structure plays a role in structural continuity, so that the design requirement of the seamless turnout is met.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the seamless turnout structure for the arched section on the roadbed and the design method thereof, temperature stress is released through the transverse broken joint, the structural rigidity is smoothly transited through the transition section, the pile plate structure is not influenced by the arching of the lower high excavation section or the expansive soil section, the damage of the continuous structure caused by the arching of the roadbed is avoided, and meanwhile, the roadbed, the transition section and the first cement graded broken stone borne by the pile plate structure play a role in structural continuity, so that the design requirement of the seamless turnout is met.
Drawings
FIG. 1 is an elevation view of a seamless turnout configuration for a raised section of a subgrade;
FIG. 2 is a schematic view of a switch zone length a;
fig. 3 is a plan view of a seamless switch structure for a raised section of a roadbed;
FIG. 4 isbase:Sub>A sectional view taken along line A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 6 is a schematic structural view of the blind ditch.
The mark in the figure is: 01-turnout, 02-turnout center, 1-plate, 11-transverse broken joint, 12-longitudinal broken joint, 2-pile, 21-filling part, 3-third cement graded broken stone, 4-second cement graded broken stone, 5-AB group filler, 6-first cement graded broken stone, 7-side ditch, 8-blind ditch, 81-concrete tank, 82-pipeline, 83-cleaned broken stone, 84-bagged gravel and 85-sealing layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
As shown in fig. 1 to 6, the design method of a seamless switch structure for a curved section of a roadbed according to the present invention comprises the following steps:
A. determining the length a of the seamless turnout structure according to the range of the high excavation section or the expansive soil section and the range of the turnout area; as shown in fig. 2, the length a is determined by the following formula: a =2 × 18+2 × d + w, unit m, where w is the two farthest fork 02 distances of the range of the segment, and d is the fork 02 to the start of the switch 01.
B. Designing the span and the structural form of the seamless turnout structure, dividing the seamless turnout structure into a plurality of joints along the line direction according to the value a, and arranging a plurality of adjacent jointsA transverse broken seam 11 with the length of 2cm-10cm is arranged to release temperature stress; after the seamless turnout structure is longitudinally divided into a plurality of joints, for the seamless turnout structure with larger width, the seamless turnout structure is transversely divided into a plurality of blocks, a longitudinal broken joint 12 with the length of 2cm-4cm is arranged between adjacent blocks, the blocking principle is determined according to the fact that the transverse temperature displacement of a single block does not exceed 2mm, if the temperature change is 20 ℃, the linear expansion coefficient of concrete is 10- 5 The width of the single block is 2/20 × 10- 5 =10000mm =10m. In this embodiment, as shown in fig. 1 and 3, the seamless turnout structure is divided equally into three halves along the longitudinal direction, and the first half is divided into two halves.
C. The method includes the steps that factors such as constant load, live load and temperature are comprehensively considered, the size of the seamless turnout structure is calculated and determined, as shown in figures 1 and 3, in order to adapt to temperature deformation, the length b of each connection does not exceed 20m, in order to enable the stress of the top surface and the bottom surface of the seamless turnout structure to be basically consistent, the ratio of an edge span to a mid span is 1/4, therefore, the hole span of each connection is determined to be arranged into a pile plate structure with the length ratio of 2: 8: 2, the size needs to be determined to meet the requirements of concrete strength, steel bar strength and cracks, the thickness of a plate 1 of the pile plate structure is 1m, a pile 2 is arranged below the plate 1, a flexible material filling portion 21 is arranged on the upper portion of the pile 2, and flexible materials comprise asphalt or fine sand.
D. As shown in fig. 4 and 5, a side ditch 7 is arranged on at least one of two sides of the seamless turnout structure, and road water is introduced into the side ditch 7; in order to meet the requirement of arching of a roadbed and reduce excavation as much as possible, excavating a 25cm-50cm thick soil layer below the plate 1, setting a slope of 1% -2% at the excavated position for smooth drainage, and then filling a sealing layer 85 with the thickness of about 10cm, wherein the sealing layer 85 is a C25 fine stone fiber concrete layer; the blind ditch 8 is arranged at the position of the slope bottom along the direction of a line, and the blind ditch 8 comprises a concrete tank 81, a PVC pipeline 82, cleaned gravel 83 and bagged gravel 84.
E. Because pile slab structure rigidity is big, in order to guarantee the smooth transition of rigidity, need set up the road bed changeover portion, the changeover portion connect the road bed with the pile slab structure is confirmed the processing mode of changeover portion, as shown in fig. 1, the longitudinal section of changeover portion is the structure of falling trapezium, the changeover portion is two-layer from top to bottom, and second cement gradation rubble 4 is laid to the lower floor, second cement gradation rubble 4 is 3% cement for the gradation rubble is mixed to the gradation rubble, and third cement gradation rubble 3 is laid to the upper strata, third cement gradation rubble 3 is 5% cement for the gradation rubble, the length L of changeover portion is confirmed through following formula: l = c + H-H x n, unit m, wherein H represents the total thickness of the upper layer and the lower layer, generally 2.7m-3.0m is taken as the upper layer thickness, c represents the length of the inverted trapezoidal bottom along the line direction, 3m-5m is taken as the n represents the gradient coefficient, and 2-5; and AB group filler 5 is paved on the roadbed.
F. And pulling through and paving 40-70 cm thick first cement graded broken stones 6 on the roadbed, the transition section and the pile plate structure, wherein the first cement graded broken stones 6 are graded broken stones doped with 5% of cement, and then paving a seamless turnout 01 on the first cement graded broken stones 6.
The embodiment a design method for a seamless switch structure of hunch place on road bed, through 11 release temperature stress of horizontal fissure of displacement, through the changeover portion makes the smooth-going transition of structural rigidity, and the high excavation place of lower part or the inflation soil section arch up do not influence the pile plate structure avoids the road bed to arch up the destruction that brings continuous structure, simultaneously the road bed the changeover portion with the pile plate structure bears first cement graded rubble 6 plays the continuous effect of structure, satisfies seamless switch 01's designing requirement.
Example 2
As shown in fig. 1 to 6, the seamless turnout structure for the arched section on the roadbed according to the present invention is designed by using the design method of the seamless turnout structure for the arched section on the roadbed according to embodiment 1, the seamless turnout structure includes a plurality of pile plate structures, the pile plate structures connect the transition sections along both sides of the road direction, the transition sections connect the roadbed, the first cement graded crushed stone 6 with a thickness of 40cm to 70cm is pulled through the roadbed, the transition sections and the pile plate structures, and the seamless turnout 01 is laid on the first cement graded crushed stone 6.
By adopting the seamless turnout structure for the arched section on the roadbed, the temperature stress is released through the transverse broken joint 11, the structural rigidity is smoothly transited through the transition section, the arching of the lower high excavation section or the expansive soil section does not influence the pile plate structure, the damage of the arching on the roadbed to the continuous structure is avoided, and meanwhile, the roadbed, the transition section and the first cement graded broken stone 6 borne by the pile plate structure play a role in structural continuity, so that the design requirement of the seamless turnout 01 is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A design method of a seamless turnout structure for an arch section on a roadbed is characterized by comprising the following steps:
A. determining the length a of the seamless turnout structure according to the range of the high excavation section or the expansive soil section and the range of the turnout area;
B. designing a span and a structural form of the seamless turnout structure, dividing the seamless turnout structure into a plurality of joints along the road direction according to the value a, and arranging transverse broken joints (11) between adjacent joints;
C. calculating and determining the size of the seamless turnout structure, wherein the length b of each joint is not more than 20m, and in order to ensure that the stress of the top surface and the bottom surface of the seamless turnout structure is basically consistent, the ratio of the side span to the middle span is 1/4, so that the pile plate structure with the length ratio of 2: 8: 2 is determined to be arranged in the span of each joint;
D. determining a processing mode of a transition section of the roadbed, wherein the transition section is connected with the roadbed and the pile plate structure;
E. and (2) pulling through and paving first cement graded broken stones (6) with the thickness of 40cm-70cm on the roadbed, the transition section and the pile plate structure, and paving a seamless turnout (01) on the first cement graded broken stones (6).
2. The design method according to claim 1, wherein in step a, the length a is determined by the following formula:
a =2 × 18+2 × d + w, unit m
Wherein, w is the distance between two farthest turnout centers (02) in the range of the section, and d is the distance from the turnout center (02) to the starting end of the turnout (01).
3. The design method according to claim 1, wherein in the step B, after the seamless turnout structure is divided into a plurality of joints along the longitudinal direction, for the seamless turnout structure with a larger width, the seamless turnout structure is divided into a plurality of blocks along the transverse direction, longitudinal cracks (12) are arranged between adjacent blocks, and the blocking principle is determined according to the transverse temperature displacement of a single block not exceeding 2 mm.
4. A design method according to claim 1, characterized in that in step C, the pile (2) upper part of the pile-plate structure is provided with a filling (21) of flexible material.
5. The design method according to claim 1, characterized in that after step C and before step D, the method further comprises the step of providing a lateral groove (7) on at least one of two sides of the seamless turnout structure.
6. A method according to claim 1, wherein after step C and before step D, the method further comprises the steps of grading and providing blind trenches (8) under the plates (1) of the pile structure.
7. The design method according to claim 1, wherein in the step D, the longitudinal section of the transition section is of an inverted trapezoid structure, the transition section comprises an upper layer and a lower layer, the lower layer is paved with the second cement graded crushed stone (4), and the upper layer is paved with the third cement graded crushed stone (3).
8. The design method of claim 7, wherein the length L of the transition section is determined by the following equation:
L＝c+(H-h)×n
wherein H represents the total thickness of the upper layer and the lower layer, H represents the thickness of the upper layer, c represents the length of the inverted trapezoid bottom along the line direction, and n represents a gradient coefficient.
9. A design method according to any one of claims 1-8, characterized in that in step E, the roadbed is paved with group AB fillers (5).
10. A seamless switch structure for a curved section on a roadbed, characterized in that the seamless switch structure is designed by using the design method of a seamless switch structure for a curved section on a roadbed according to any one of claims 1 to 9, the seamless switch structure comprises a plurality of pile plate structures, the pile plate structures are connected with the transition section along two sides of the road direction, the transition section is connected with the roadbed, the transition section and the pile plate structures are pulled through the first cement-graded crushed stone (6) with the thickness of 40cm-70cm, and a seamless switch (01) is laid on the first cement-graded crushed stone (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210843467.7A CN115162062A (en) | 2022-07-18 | 2022-07-18 | Seamless turnout structure for arch section on roadbed and design method thereof |
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| CN202210843467.7A CN115162062A (en) | 2022-07-18 | 2022-07-18 | Seamless turnout structure for arch section on roadbed and design method thereof |
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