CN210238157U - Plateau permafrost region high-speed railway roadbed structure - Google Patents
Plateau permafrost region high-speed railway roadbed structure Download PDFInfo
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- CN210238157U CN210238157U CN201920870400.6U CN201920870400U CN210238157U CN 210238157 U CN210238157 U CN 210238157U CN 201920870400 U CN201920870400 U CN 201920870400U CN 210238157 U CN210238157 U CN 210238157U
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Abstract
The utility model relates to a plateau permafrost region high-speed railway roadbed structure, the roadbed structure bottom is a pile, the pile top is a reinforced concrete groove-shaped supporting plate, the groove-shaped supporting plate comprises a bottom plate and rib plates at two sides, graded broken stones are laid on the bottom plate, and a track structure is arranged on the graded broken stones; the pile is a mechanical pore-forming cast-in-place pile, the reinforcement is arranged through the pile, the bottom of the pile extends into permafrost, and the short reinforcement is additionally arranged near the natural upper limit of the permafrost. The utility model discloses using permafrost region pile foundation computational theory, fully considering freezes and melts two kinds of states, and the pile foundation layer board structure of design has both solved technological problems such as permafrost region road bed subsides, frost heaving, fracture, inhomogeneous deformation, and reducible road bed earthwork exploitation, railway take up an area again makes things convenient for the wild animal to normally pass, provides technological approach and method for the construction of permafrost region high-speed railway.
Description
Technical Field
The utility model relates to a road bed, concretely relates to plateau permafrost region high-speed railway roadbed structure.
Background
The high-speed railway subgrade is a foundation for bearing a track structure and train load, is an important component of railway engineering, and is a key project for ensuring a high-speed, safe and comfortable running system of a train. The roadbed engineering has enough strength, rigidity, stability and durability besides basic functions, so that the roadbed is smooth, and the long-term stability and safety of a railway foundation are ensured. The settlement control standard of the high-speed railway subgrade after construction is shown in the table 1.
The ice content of the soil body is the fundamental place of perennial frozen soil which is different from other rock-soil, and is the fundamental place of the phenomena of thawing sinking, frost heaving and poor frozen soil. Thick-layer underground ice and high-ice-content frozen soil often exist near the natural upper limit of the permafrost, and are easy to melt due to shallow burial and influence of natural factors such as climate, ecology, micro landform and hydrological conditions and various artificial activities, so that the conventional permafrost protection technologies such as flake air cooling, ventilation pipes and heat pipes cannot ensure that the permafrost is not subjected to thawing-sinking and frost heaving deformation, and cannot meet the requirements of the technical standards of high-speed railway settlement.
Disclosure of Invention
The utility model aims at providing a plateau permafrost region high-speed railway roadbed structure satisfies plateau permafrost region user demand.
The utility model discloses the technical scheme who adopts does:
the utility model provides a plateau permafrost region high-speed railway roadbed structure which characterized in that:
the roadbed structure comprises a roadbed structure, piles, a reinforced concrete groove-shaped supporting plate and a steel bar concrete groove-shaped supporting plate, wherein the bottom of the roadbed structure is provided with the piles, the pile top of the roadbed structure is provided with the reinforced concrete groove-shaped supporting plate, the groove-shaped supporting plate comprises a bottom plate and rib plates on two sides, graded broken stones are paved on the bottom plate, and a track structure;
the pile is a mechanical pore-forming cast-in-place pile, the reinforcement is arranged through the pile, the bottom of the pile extends into permafrost, and the short reinforcement is additionally arranged near the natural upper limit of the permafrost.
Foundation net upright posts are arranged on the bottom plate of the groove-shaped supporting plate and on two sides of the graded broken stones.
And cable grooves are formed in the bottom plate of the groove-shaped supporting plate and the outer side of the foundation net stand column.
Upright handrails are arranged on the ribbed slabs on the two sides of the groove-shaped supporting plate.
The ribbed slab of the groove-shaped supporting plate is provided with an outward water drainage hole.
The pile is directly and rigidly connected with the groove-shaped supporting plate, and the pile top is embedded into the plate bottom.
And at the joint of the roadbed structure and the bridge, the end part of the groove-shaped supporting plate is placed on a bracket arranged on the end face of the abutment.
An expansion joint of 3cm is reserved between the end part of the groove-shaped supporting plate and the abutment tail, and a foam rubber plate is filled in the expansion joint.
The utility model has the advantages of it is following:
1. the pile foundation supporting plate structure is applied to a pile foundation calculation theory in a permafrost region, two states of freezing and melting are fully considered, the technical problems of subgrade settlement, frost heaving, cracking, uneven deformation and the like in the permafrost region are solved, and high-speed, safe and comfortable operation of a high-speed railway is ensured.
2. The pile foundation construction adopts a rotary drilling dry-method hole forming technology, the hole forming speed is high, the hole wall is regular, the thermal disturbance to the frozen soil is small, the disturbance to the frozen soil environment is small, and the construction quality of the bored pile cast-in-place pile can be greatly improved; because no slurry exists, the pollution to the environment is greatly reduced, and the environment is protected.
3. The traditional thought that the roadbed is a continuous strip-shaped solid structure is broken through, the earthwork exploitation of the roadbed is greatly reduced, the occupied area of a railway and the earth taking field are reduced, and the protection of vegetation in a frozen soil area and the environmental protection are facilitated.
4. The space between the piles is beneficial to normal passage, migration and reproduction and rest of wild animals, and is beneficial to ecological environment protection.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a front view of the present invention.
In the figure, 1-foundation net upright post, 2-railing, 3-cable trough, 4-water drainage hole, 5-graded broken stone, 6-trough type supporting plate, 7-pile, 8-bracket and 9-bridge abutment.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a plateau permafrost region high-speed railway roadbed structure, the roadbed structure bottom is the stake 7, the stake top is the cell type layer board 6 of reinforced concrete, the cell type layer board 6 includes bottom plate and the floor of both sides, the bottom plate upper berth is equipped with the graded broken stone 5 (mix 5% cement), set up the track structure on the graded broken stone 5; the pile 7 is a mechanical pore-forming cast-in-place pile, the length of the pile is full, the reinforcement rate is not less than 0.6%, the diameter of the pile is 1m, the distance between transverse piles is 4.6-5 m, the distance between longitudinal piles is 5-7 m, a dry pore-forming process of a rotary drilling rig is adopted for pore-forming, two states of freezing and melting are considered for a pile foundation, and a certain safety degree is reserved. The freezing force or friction force of the foundation soil within the range of 1.5 times of the natural upper limit depth is not counted, and the freezing force of the soil-containing ice layer is not counted. The pile bottom can not be arranged on the ice layer containing soil. The pile bottom is deep into permafrost, and when the natural upper limit of the permafrost is high-ice-content permafrost, according to the engineering geological conditions, a short reinforcing steel bar is additionally arranged to resist the freeze-drawing force generated by soil frost heaving. The pile 7 is directly and rigidly connected with the groove-shaped supporting plate 6, and the top of the pile is embedded into the bottom of the plate by 0.1 m.
The thickness of the groove-shaped supporting plate 6 is 1.0m, and the width is determined by calculation according to the track type, the number of positive lines, the line spacing, the curve widening, the road shoulder width, the cable groove, the contact net upright column type, the foundation type and other factors.
And foundation net upright posts 1 are arranged on the bottom plate of the groove-shaped supporting plate 6 and on two sides of the graded broken stone 5. And a cable groove 3 is arranged on the bottom plate of the groove-shaped supporting plate 6 and outside the foundation net upright post 1. Upright handrails 2 are arranged on the ribbed slabs on the two sides of the groove-shaped supporting plate 6. The ribbed slab of the groove-shaped supporting plate 6 is provided with an outward water drainage hole 4.
And at the joint of the roadbed structure and the bridge, the end part of the groove-shaped supporting plate 6 is put on a bracket 8 arranged on the end surface of the abutment 9. An expansion joint of 3cm is reserved between the end part of the groove-shaped supporting plate 6 and the tail end of the abutment 9, and a foam rubber plate is filled in the expansion joint.
The utility model discloses a work progress does:
1. when the drilling construction site is arranged, the filling and the digging are avoided as much as possible, and the thermal disturbance to the original surface foundation soil is reduced.
2. The hole forming adopts a dry method hole forming process, and is not suitable for operation with slurry. The steel pile casing is embedded by adopting a pressurizing, hammering or vibrating method, and the bottom of the pile casing is not less than 0.5 m below the upper limit of the permafrost.
3. Construction of drilled pile
(1) The drilling construction of each pile should be carried out continuously, and for this reason, the machine should be stopped and the drill bit should be lifted, and the drill with drill rod should be lifted above 5m away from the bottom of the hole, and the drill bit should be lifted out of the hole by other drills.
(2) After the hole is formed to reach the design elevation, the conditions of hole forming quality, hole bottom sediment and the like are checked; and after the inspection is qualified, the next procedure is required to be carried out in time, and the intermittent time is not required to be too long. And reporting in time according to a construction program when the pile bottom has an ice layer containing soil.
(3) The concrete should be poured continuously; and protective measures are taken at the hole opening to prevent the loose soil at the hole opening from falling into the hole.
(4) The temperature of the cast concrete is not higher than 10 ℃ when the concrete is poured.
(5) And after the pile foundation construction is finished, performing anti-frost heaving treatment on the pile foundation according to design requirements, and monitoring the ground temperature around the pile.
(6) And after the pile construction is finished for 28 days, carrying out pile-forming quality detection on all foundation piles by adopting a low-strain reflection wave method, and carrying out a foundation pile load test according to design requirements so as to test the bearing capacity of the foundation piles.
4. Construction of groove-shaped supporting plate
(1) The slab is cast in sections by concrete with low hydration heat. And (4) embedding a railing bolt in pouring, and reserving a water drainage hole.
(2) In order to reduce the shrinkage of concrete, the mix proportion of the concrete is reasonably adjusted, early-stage high-strength cement with low hydration heat and low shrinkage is adopted as much as possible, the cement consumption is reduced, the water cement ratio is reduced, and the moisture-keeping and health-preserving work is enhanced.
(3) In the concrete pouring process, a shielding measure should be taken in rainy and snowy days, and water can not be soaked before the concrete reaches the final setting.
(4) The construction joint position of continuous plate sets up vertical reinforcing bar, and reinforcing bar quantity is 50% of vertical reinforcing bar, and the same vertical reinforcing bar of reinforcing bar diameter, reinforcing bar insert the both sides concrete degree of depth and are not less than 1 m.
(5) The longitudinal steel bars in the plate are subjected to flash butt welding, and the strength of a welding joint is not lower than the tensile strength of the steel bars; the welding joints are arranged at the positions with smaller bearing stress and are staggered with each other, and the number of the welding joints of the longitudinal steel bars is not more than 50% of the number of the longitudinal steel bars; the same reinforcing steel bar needs to be provided with less joints.
(6) After the plate is constructed, covering, moisturizing, heat preservation and maintenance are carried out in time for 1-2 months. When the covering heat preservation is adopted, the heat preservation layer covered outside the template and on the concrete surface does not need to adopt a wet material, and the heat preservation material does not need to be directly paved on the wet concrete surface, and a layer of plastic film needs to be paved on the newly poured concrete surface.
(7) After the maintenance period is finished, in order to avoid long-time exposure and influence of temperature change, the wheat straws with the thickness not less than 5cm are covered on the plate surface for protection.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (8)
1. The utility model provides a plateau permafrost region high-speed railway roadbed structure which characterized in that:
the roadbed structure is characterized in that piles (7) are arranged at the bottoms of the roadbed structures, pile tops are reinforced concrete groove-shaped supporting plates (6), each groove-shaped supporting plate (6) comprises a bottom plate and rib plates on two sides, graded broken stones (5) are paved on the bottom plates, and a track structure is arranged on each graded broken stone (5);
the pile (7) is a mechanical pore-forming cast-in-place pile, long reinforcing bars are arranged through the pile, the bottom of the pile extends into permafrost, and short reinforcing bars are additionally arranged near the natural upper limit of the permafrost.
2. The roadbed structure of the high-speed railway in the plateau permafrost region, as recited in claim 1, wherein:
the foundation net upright posts (1) are arranged on the bottom plate of the groove-shaped supporting plate (6) and on two sides of the graded broken stone (5).
3. The roadbed structure of the high-speed railway in the plateau permafrost region as claimed in claim 2, wherein:
and cable grooves (3) are formed in the bottom plate of the groove-shaped supporting plate (6) and outside the foundation net upright posts (1).
4. The roadbed structure of the high-speed railway in the plateau permafrost region, according to claim 3, wherein:
upright handrails (2) are arranged on the ribbed slabs at the two sides of the groove-shaped supporting plate (6).
5. The roadbed structure of the high-speed railway in the plateau permafrost region, according to claim 4, wherein:
the ribbed slab of the groove-shaped supporting plate (6) is provided with outward water drainage holes (4).
6. The roadbed structure of the high-speed railway in the plateau permafrost region, as recited in claim 5, wherein:
the pile (7) is directly and rigidly connected with the groove-shaped supporting plate (6), and the pile top is embedded into the plate bottom.
7. The roadbed structure of the high-speed railway in the plateau permafrost region, as recited in claim 6, wherein:
and at the joint of the roadbed structure and the bridge, the end part of the groove-shaped supporting plate (6) is placed on a bracket (8) arranged on the end surface of the abutment (9).
8. The roadbed structure of the high-speed railway in the plateau permafrost region, according to claim 7, wherein:
an expansion joint of 3cm is reserved between the end part of the groove-shaped supporting plate (6) and the tail of the abutment (9), and a foam rubber plate is filled in the expansion joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920870400.6U CN210238157U (en) | 2019-06-11 | 2019-06-11 | Plateau permafrost region high-speed railway roadbed structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920870400.6U CN210238157U (en) | 2019-06-11 | 2019-06-11 | Plateau permafrost region high-speed railway roadbed structure |
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| CN210238157U true CN210238157U (en) | 2020-04-03 |
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| CN201920870400.6U Active CN210238157U (en) | 2019-06-11 | 2019-06-11 | Plateau permafrost region high-speed railway roadbed structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172871A (en) * | 2019-06-11 | 2019-08-27 | 中铁第一勘察设计院集团有限公司 | Plateau Permafrost Regions High Speed Railway Subgrade and its construction method |
| CN114775354A (en) * | 2022-05-09 | 2022-07-22 | 交通运输部公路科学研究所 | Assembled sheet pile composite pavement structure penetrating through permafrost region of Qinghai-Tibet plateau |
-
2019
- 2019-06-11 CN CN201920870400.6U patent/CN210238157U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172871A (en) * | 2019-06-11 | 2019-08-27 | 中铁第一勘察设计院集团有限公司 | Plateau Permafrost Regions High Speed Railway Subgrade and its construction method |
| CN114775354A (en) * | 2022-05-09 | 2022-07-22 | 交通运输部公路科学研究所 | Assembled sheet pile composite pavement structure penetrating through permafrost region of Qinghai-Tibet plateau |
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