CN113279290A - Waterproof roadbed structure for railways in coastal high-water-level areas and construction method of waterproof roadbed structure - Google Patents
Waterproof roadbed structure for railways in coastal high-water-level areas and construction method of waterproof roadbed structure Download PDFInfo
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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
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/001—Track with ballast
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/01—Elastic layers other than rail-pads, e.g. sleeper-shoes, bituconcrete
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Abstract
The invention discloses a waterproof roadbed structure of a railway in a coastal high-water-level area and a construction method thereof, wherein the waterproof roadbed structure comprises a dredging and filling layer, a graded broken stone crack pouring layer, a waterproof layer and a waterproof protective layer which are sequentially paved from bottom to top, the waterproof layer comprises a reinforced concrete roadbed trench integrally poured above the graded broken stone crack pouring layer, asphalt waterproof layers are coated on the inner side, the outer side and the bottom of the reinforced concrete roadbed trench and are filled with a graded broken stone stabilizing layer, the top of the reinforced concrete roadbed trench is sealed by an asphalt waterproof sealing layer, the waterproof protective layer comprises an asphalt concrete layer and a graded broken stone bottom layer which are sequentially paved above the asphalt waterproof sealing layer, and sleepers and steel rails are paved above the graded broken stone bottom layer by railway stones. The invention fully utilizes the rigid structure of the reinforced concrete to meet the bearing capacity requirement of the railway roadbed, well achieves the protection effect by utilizing the waterproof property of the asphalt and the asphalt concrete, has better integrity and stronger roadbed stability, and has the advantages of convenient construction, low cost and wide application range.
Description
Technical Field
The invention relates to the technical field of railway roadbed waterproof construction, in particular to a railway waterproof roadbed structure in a coastal high-water-level area and a construction method thereof.
Background
The roadbed structure is an area which bears the most influence of train dynamic load, climate and environment (rainwater, surface water, underground water and freeze thawing), and is required to have sufficient strength and rigidity. The graded broken stone material as the roadbed filling can provide enough bearing capacity under the state of the optimal water content to play the function, and gradually loses the function under the erosion and softening of water, thereby influencing the comfort and the safety of train operation. Especially under coastal environment, native soil is mostly mucky soil, and the bearing capacity is not enough, and the ground water level is higher, and the groundwater level changes frequently under the morning and evening tides effect, and the high salinity and the frequent change of groundwater easily cause roadbed structure's destruction, how to avoid coastal area groundwater to railway roadbed structure's influence, guarantee railway operation's safety, are the difficult point of coastal railway roadbed structure design.
Disclosure of Invention
The invention aims to provide a waterproof roadbed structure of a railway in a coastal high-water-level area and a construction method thereof, so as to solve the technical problems in the background technology.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a waterproof roadbed structure of a railway in a coastal high-water-level area comprises a dredging and filling layer, a graded broken stone crack pouring layer, a waterproof layer and a waterproof protective layer which are sequentially laid from bottom to top, the waterproof layer comprises a reinforced concrete road foundation groove integrally poured above the graded broken stone crack pouring layer, the reinforced concrete road foundation groove is of a U-shaped structure with an upward opening, asphalt waterproof layers are coated on the inner side, the outer side and the bottom of the reinforced concrete pavement foundation ditch, graded broken stone stabilizing layers are filled in the asphalt waterproof layers, the graded broken stone stabilizing layers are flush with the top of the reinforced concrete pavement foundation ditch and are capped through asphalt waterproof sealing layers, the asphalt waterproof sealing layer is in sealing fit with the asphalt waterproof layer to wrap and seal the graded broken stone stabilizing layer, the waterproof protective layer comprises an asphalt concrete layer and a graded broken stone bottom ballast layer which are sequentially paved above the asphalt waterproof sealing layer, and a sleeper and a steel rail are paved above the graded broken stone bottom ballast layer through railway ballasts.
Preferably, the top of the dredging and filling layer is provided with a 1% -4% drainage gradient along the original ground gradient direction, and the graded gravel crack pouring layer, the reinforced concrete road foundation trench, the asphalt waterproof sealing layer and the asphalt concrete layer are all obliquely paved above the dredging and filling layer according to the designed thickness.
Preferably, a drainage ditch is arranged on one side of the slope toe of the roadbed structure, and the drainage ditch is of a reinforced concrete structure and is integrally cast with a reinforced concrete roadbed groove.
In addition, the invention also provides a construction method of the waterproof roadbed structure of the railway in the coastal high-water-level area, which comprises the following steps:
firstly, constructing a dredging and filling layer, excavating a roadbed at a design planning position to reach the designed bottom elevation of the roadbed, carrying out a field bearing capacity test, determining the field roadbed bearing load value and filling requirements and depth by a dynamic sounding method, and then filling and compacting by adopting dog-headed stones or boulders;
filling a graded broken stone crack pouring layer, backfilling the graded broken stone crack pouring layer with the thickness of 15-25cm, and leveling and compacting;
step three, pouring a reinforced concrete road foundation trench, binding reinforced concrete road foundation trench reinforcing bars according to a design drawing, and erecting a template for concrete pouring construction;
coating an asphalt waterproof layer, and coating asphalt waterproof paint on the inner side, the outer side and the bottom of the reinforced concrete road foundation groove after the mold is removed;
filling a graded broken stone stabilizing layer, filling a 50-60cm thick graded broken stone stabilizing layer in the reinforced concrete road foundation trench, and leveling and compacting;
step six, constructing an asphalt waterproof seal, and spraying the asphalt waterproof seal on the top surfaces of the reinforced concrete road foundation trench and the graded broken stone stabilizing layer to tightly seal the top surfaces of the reinforced concrete road foundation trench and the graded broken stone stabilizing layer;
constructing an asphalt concrete layer, and paving asphalt concrete with the thickness of 4-6cm on the top surface of the asphalt waterproof seal layer;
step eight, constructing a graded broken stone bottom ballast layer, and paving a graded broken stone bottom ballast layer with the thickness of 15-25cm on the upper part of the asphalt concrete layer to serve as a protective layer of the asphalt concrete layer;
and step nine, paving steel rails, and paving sleepers and the steel rails on the graded broken stone bottom ballast layer in sequence through the ballast to complete roadbed structure construction.
Preferably, in the step one, the dredging, filling and layer-changing depth is 0.5-3.0m, the filling and layer-changing width is 0.5-1.0m larger than the designed roadbed width single side, the filling and layer-changing width is enlarged downwards at an angle of 30-45 degrees to ensure the stability of the filling and layer-changing slope, the filling and layer-changing construction adopts layered filling and layer-changing compaction, and the single-layer filling and layer-changing thickness is 0.3-0.5 m.
Preferably, the asphalt waterproof layer in the fourth step needs to be sprayed in two layers, and the spraying amount of the first layer of asphalt waterproof coating is 1.2-1.5L/m2The spraying amount of the second layer of asphalt waterproof coating is 0.6-0.8L/m2。
Preferably, the graded broken stone stabilizing layer in the fifth step needs to be filled and compacted layer by layer, and the filling and compacting thickness of each layer is between 20 and 25 cm.
Preferably, the asphalt waterproof sealing layer in the sixth step needs to be sprayed in two layers for construction, firstly, MC1 asphalt waterproof paint is sprayed on the top surfaces of the reinforced concrete pavement foundation trench and the graded broken stone stabilizing layer for sealing, and the spraying amount is 0.9-1.0L/m2Ensuring that the MC1 asphalt waterproof paint permeates into the graded broken stone stabilizing layer by 2-3cm, and then spreading a second layer of emulsified asphalt waterproof paint with the spraying amount of 1.2-1.3L/m2And then spreading a gravel layer, wherein the thickness of the gravel layer is 1.5cm, the particle size of the gravel is 5-10mm, the ratio of the gravel is more than 90%, and the content of the stone powder with the particle size of less than 0.075mm is not more than 1.0%, and finally forming the asphalt gravel sealing layer with the thickness of 1.5 cm.
Preferably, the reinforced concrete pavement foundation groove reinforcing bars in the third step comprise longitudinal and transverse reinforcing bars and U-shaped roadbed channel reinforcing bars, the arrangement intervals of the longitudinal and transverse reinforcing bars are 12-15cm, and the diameter of each reinforcing bar is 10 mm.
Preferably, the concrete pouring thickness of the reinforced concrete pavement foundation trench in the third step is 20-30cm, and the concrete is C35 concrete and is added with a rust inhibitor and a waterproof compacting agent.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention fully utilizes the rigid structure of the reinforced concrete to meet the bearing capacity requirement of the railway roadbed, utilizes the graded broken stone stabilizing layer to buffer the dynamic load of the train on the upper part of the roadbed, utilizes the waterproof property of the asphalt and the asphalt concrete to well achieve the protection effect, organically combines the rigidity of the reinforced concrete and the flexibility of the asphalt and the asphalt concrete to form a closed waterproof roadbed structure, achieves the effects of protecting the roadbed structure and avoiding the influence of underground water level change on the roadbed structure, blocks the sedimentation caused by potential water damage of the roadbed, fills the blank of the waterproof roadbed structure of the railway in coastal high water level areas, meets the safe operation requirement of the railway in coastal area water level constantly changing areas, and has the advantages of convenient construction, low cost and wide application range;
2. according to the invention, the U-shaped box-shaped reinforced concrete road foundation trench is used as a bearing carrier of the graded broken stone stabilizing layer, the graded broken stone stabilizing layer is hermetically wrapped in the U-shaped box through the asphalt waterproof layer and the asphalt waterproof sealing layer, so that the full-section sealing of the graded broken stone stabilizing layer is realized, the erosion action of underground water, surface water and rainwater can be effectively prevented, the reinforced concrete road foundation trench with a rigid structure can effectively and uniformly transmit loads to the lower part, the integrity, the vertical stability and the lateral stability of a road foundation structure are further improved, and the problem of uneven settlement caused by a silt texture foundation is avoided;
3. the reinforced concrete pavement foundation trench is cast by adopting high-grade concrete added with the rust inhibitor and the waterproof compacting agent, the compactness of a concrete structure is further enhanced by adjusting the proportion of coarse and fine aggregates of the concrete material, and the asphalt waterproof layer on the outer side of the reinforced concrete pavement foundation trench can effectively reduce the contact area between underground water with higher salinity and the concrete, improve the underground water corrosion resistance of the reinforced concrete pavement foundation trench and prolong the effective service life of the roadbed structure.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative, not limiting of the invention, and in which:
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals: 1-dredging and filling layer, 2-graded broken stone crack pouring layer, 3-reinforced concrete road foundation trench, 4-asphalt waterproof layer, 5-graded broken stone stabilizing layer, 6-asphalt waterproof sealing layer, 7-asphalt concrete layer, 8-graded broken stone bottom ballast layer, 9-ballast, 10-sleeper, 11-steel rail and 12-drainage ditch.
Detailed Description
Hereinafter, an embodiment of a waterproof roadbed structure for a railway at a coastal high water level area and a construction method thereof according to the present invention will be described with reference to the accompanying drawings. The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "top", "bottom", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
The principles and features of the present invention will be described in connection with the drawings and the Laves port branch exemplary section of the Lai railway project, the illustrated embodiment being intended to illustrate the invention and not to limit the scope of the invention. Referring to fig. 1, a preferred embodiment of the present invention will be described in further detail, where the laugh of lauses harbor is located at the west coast of the gulf of atlantic ocean, which is a typical high water level area of a coastal railway, and the water level changes frequently under the action of tide, which is a difficult point of the design of a common roadbed structure:
as shown in figure 1, the preferable coastal high water level area railway waterproof roadbed structure comprises a dredging and filling layer 1, a graded broken stone crack pouring layer 2, a waterproof layer and a waterproof protective layer which are sequentially paved from bottom to top, wherein the waterproof layer comprises a reinforced concrete roadbed trench 3 integrally poured above the graded broken stone crack pouring layer 2, the reinforced concrete roadbed trench 3 is of an upward-opening U-shaped structure, the inner side, the outer side and the bottom of the reinforced concrete roadbed trench are coated with an asphalt waterproof layer 4 and filled with a graded broken stone stabilizing layer 5, the graded broken stone stabilizing layer 5 is flush with the top of the reinforced concrete roadbed trench 3 and is sealed by an asphalt waterproof seal 6, the asphalt waterproof seal 6 is in sealing fit with the asphalt waterproof layer 4 to wrap and seal the graded broken stone stabilizing layer 5, the waterproof protective layer comprises an asphalt concrete layer 7 and a graded broken stone bottom ballast layer 8 which are sequentially paved above the asphalt waterproof seal 6, a sleeper 10 and a steel rail 11 are laid above the graded broken stone bottom ballast layer 8 through a railway ballast 9;
the top of the dredging and filling layer 1 is provided with 1% -4% of drainage gradient along the original ground gradient direction, the graded broken stone crack pouring layer 2, the reinforced concrete road foundation groove 3, the asphalt waterproof sealing layer 6 and the asphalt concrete layer 7 are all obliquely paved above the dredging and filling layer 1 according to the designed thickness in sequence, one side of a slope foot of the roadbed structure is provided with a drainage ditch 12, the drainage ditch 12 is of a reinforced concrete structure and is integrally poured and formed with the reinforced concrete road foundation groove 3, after pouring is completed, the height of the road surface is generally not lower than the original ground height, the height of the constructed road surface needs to be 20-30cm higher than the ground under the condition of permission of site construction, and the top of the reinforced concrete road foundation groove 3 is 20cm higher than a normal underground water level line.
The invention relates to a construction method of a railway waterproof roadbed structure in a coastal high-water-level area, which mainly comprises the following steps:
firstly, constructing a dredging and filling layer 1, excavating a roadbed at a design planning position, excavating to the designed bottom elevation of the roadbed, then carrying out a field bearing capacity test, determining the field roadbed bearing load value and the filling requirement and depth by a dynamic sounding method, and carrying out filling compaction by adopting dog-headed stones or boulders, wherein in general, filling is carried out when the roadbed bearing capacity is less than 150KN, the filling depth is different according to different bearing capacity conditions, the common filling depth is 0.5-3.0m, the filling width is greater than the single side of the designed roadbed width by 0.5-1.0m, the filling width is enlarged downwards at an angle of 30-45 degrees, the stability of filling side slopes is ensured, and the filling construction adopts layered filling layered compaction, and the single-layer thickness is 0.3-0.5 m;
filling a graded broken stone crack pouring layer 2, backfilling the graded broken stone crack pouring layer 2 with the thickness of 15-25cm, leveling and compacting, wherein the backfill depth is determined to be 15cm through calculation, the grain diameter of the graded broken stone is 0.025-22.5mm, the uneven coefficient of grains is not less than 15, the content of grains below 0.025mm is not more than 3%, and the graded broken stone is compacted by adopting a 30-ton double-steel-wheel vibration road machine after being paved, and the compaction degree is not less than 95%;
step three, pouring a reinforced concrete road foundation trench 3, binding longitudinal and transverse reinforcing steel bars and U-shaped road foundation trench reinforcing steel bars (the longitudinal and transverse spacing is 12-15cm, the diameter of the reinforcing steel bars is 10 mm) according to a design drawing, setting up a steel template or a wood template, pouring C35 concrete with the thickness of 20-30cm, adding a certain proportion of additives (mainly rust inhibitor and waterproof compacting agent) into the concrete, vibrating during pouring, and performing sprinkling maintenance after pouring is completed, wherein the thickness of the reinforced concrete road foundation trench 3 is increased according to the increase of the depth of the reinforced concrete road foundation trench, the specific thickness is determined by stress analysis calculation, the trench wall mainly bears the soil pressure, the influence of railway load on the trench wall is small, the maximum bearing capacity of the trench wall is not less than 230KN in the embodiment, for coastal areas with high salinity of underground water, the reinforced concrete road foundation trench 3 adopts the following anticorrosion treatment, i.e. firstly, adding a certain amount of additives (mainly adding rust inhibitor and waterproof compacting agent into the concrete) into the concrete, secondly, adjusting the proportion of coarse and fine aggregates, enhancing the compactness of concrete, thirdly, improving the grade of the concrete, adopting C35 concrete, fourthly, coating two layers of waterproof asphalt on the surface layer of the concrete, and reducing the effective contact area between underground water and the concrete;
step four, brushing an asphalt waterproof layer 4, brushing asphalt waterproof paint on the inner side, the outer side and the bottom of the reinforced concrete pavement foundation groove 3 after the formwork is removed, wherein the asphalt waterproof layer 4 needs to be sprayed in two layers, and the spraying amount of the asphalt waterproof paint on the first layer is 1.2-1.5L/m2The spraying amount of the second layer of asphalt waterproof coating is 0.6-0.8L/m2；
Filling a graded broken stone stabilizing layer 5, filling the graded broken stone stabilizing layer 5 with the thickness of 50-60cm in a reinforced concrete road foundation trench 3, leveling and compacting, wherein the graded broken stone stabilizing layer 5 needs to be filled and compacted layer by layer, the filling and compacting thickness of each layer is 20-25cm, the filling thickness of the graded broken stone stabilizing layer 5 is determined to be 60cm through calculation in the embodiment, the filling and compacting are performed in three layers, the thickness of each layer is 20cm, the water content of graded broken stones is controlled to be about 6.3%, a first layer and a second layer are compacted by a 5-ton small-sized road roller, a third layer is compacted by a 15-ton road roller, and the compaction degree is not less than 96%;
sixthly, constructing an asphalt waterproof seal 6, spraying MC1 asphalt waterproof paint on the top surfaces of the reinforced concrete road foundation trench 3 and the graded broken stone stabilizing layer 5 to tightly seal the top parts of the reinforced concrete road foundation trench 3 and the graded broken stone stabilizing layer 5, wherein the asphalt waterproof seal 6 needs to be sprayed in two layers, firstly, spraying MC1 asphalt waterproof paint on the top surfaces of the reinforced concrete road foundation trench 3 and the graded broken stone stabilizing layer 5 to seal the top, and the spraying amount is 0.9-1.0L/m2Ensuring that the MC1 asphalt waterproof paint permeates into the graded broken stone stabilizing layer 5 by 2-3cm, and then spreading a second layer of emulsified asphalt waterproof paint with the spraying amount of 1.2-1.3L/m2Then, a gravel layer is spread, the thickness of the gravel layer is 1.5cm, the particle size of the gravel is 5-10mm, the ratio of the gravel is more than 90%, and the content of the stone powder with the particle size of less than 0.075mm is not more than 1.0%, and finally the asphalt gravel sealing layer with the thickness of 1.5cm is formed;
constructing an asphalt concrete layer 7, paving 4-6 cm-thick asphalt concrete on the top surface of the asphalt waterproof seal 6, wherein the asphalt concrete is produced by a centralized asphalt concrete mixing station, a special large transport vehicle fleet is adopted for transportation, the asphalt surface is covered and insulated, the temperature of the asphalt concrete reaching the site is generally not less than 135 ℃, and the asphalt concrete is paved and rolled in time, the asphalt concrete is paved by adopting a special asphalt paver, the thickness is 4-6cm, the embodiment is calculated, the paving thickness of 5cm is determined on site, a 6-8 ton smooth-wheel road roller is adopted for compacting after paving is finished, then a 12-15 ton large road roller is adopted for compacting, and finally the asphalt concrete reaches the designed compactness and good flatness;
step eight, constructing a graded broken stone bottom ballast layer 8, paving the graded broken stone bottom ballast layer 8 with the thickness of 15-25cm on the upper part of the asphalt concrete layer 7, and compacting by adopting a 30-ton double-steel-wheel vibrating road machine, wherein the compaction degree is not less than 95%, so that the aim of protecting the asphalt concrete layer 7 is fulfilled;
and step nine, paving a steel rail 11, and paving a sleeper 10 and the steel rail 11 on the graded broken stone bottom ballast layer 8 in sequence through a railway ballast 9 to complete roadbed structure construction.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a waterproof roadbed structure of coastal high water level area railway which characterized in that: comprises a dredging and filling layer (1), a graded broken stone crack pouring layer (2), a waterproof layer and a waterproof protective layer which are sequentially paved from bottom to top, wherein the waterproof layer comprises a reinforced concrete road foundation trench (3) integrally poured above the graded broken stone crack pouring layer (2), the reinforced concrete road foundation trench (3) is of a U-shaped structure with an upward opening, asphalt waterproof layers (4) are coated on the inner side, the outer side and the bottom of the reinforced concrete road foundation trench, a graded broken stone stabilizing layer (5) is filled in the reinforced concrete road foundation trench, the graded broken stone stabilizing layer (5) is flush with the top of the reinforced concrete road foundation trench (3) and is sealed by an asphalt waterproof seal (6), the asphalt waterproof seal (6) is in sealing fit with the asphalt waterproof layers (4) to wrap and seal the graded broken stone stabilizing layer (5), the waterproof protective layer comprises an asphalt concrete layer (7) and a graded broken stone bottom ballast layer (8) which are sequentially paved above the asphalt waterproof seal (6), and a sleeper (10) and a steel rail (11) are paved above the graded broken stone bottom ballast layer (8) through a railway ballast (9).
2. The waterproof roadbed structure for the railways in the coastal high-water-level areas, according to claim 1, is characterized in that: the top of the dredging and filling layer (1) is provided with 1% -4% of drainage gradient along the original ground gradient direction, and the graded broken stone crack pouring layer (2), the reinforced concrete road foundation trench (3), the asphalt waterproof seal layer (6) and the asphalt concrete layer (7) are all obliquely paved above the dredging and filling layer (1) according to the designed thickness.
3. The waterproof roadbed structure for the railways in the coastal high-water-level areas, according to claim 2, is characterized in that: a drainage ditch (12) is arranged on one side of the slope toe of the roadbed structure, and the drainage ditch (12) is of a reinforced concrete structure and integrally poured with a reinforced concrete roadbed groove (3).
4. A construction method for use in a construction process of a waterproof roadbed structure of a railway at a coastal high water level area according to any one of claims 1 to 3, comprising the steps of:
firstly, constructing a dredging and filling layer (1), excavating a roadbed at a design planning position to reach the designed bottom elevation of the roadbed, carrying out a field bearing capacity test, determining the field roadbed bearing load value and filling requirements and depth by a dynamic sounding method, and then filling and compacting by adopting dog-headed stones or boulders;
filling the graded broken stone crack pouring layer (2), backfilling the graded broken stone crack pouring layer (2) with the thickness of 15-25cm, and leveling and compacting;
pouring the reinforced concrete road foundation trench (3), binding the reinforced concrete road foundation trench (3) for reinforcing bars according to a design drawing, and erecting a template for concrete pouring construction;
coating an asphalt waterproof layer (4), and coating asphalt waterproof paint on the inner side, the outer side and the bottom of the reinforced concrete road foundation groove (3) after the form removal;
fifthly, filling a graded broken stone stabilizing layer (5), filling the graded broken stone stabilizing layer (5) with the thickness of 50-60cm in the reinforced concrete road foundation trench (3), and leveling and compacting;
constructing an asphalt waterproof seal layer (6), and spraying the asphalt waterproof seal layer (6) on the top surfaces of the reinforced concrete road foundation trench (3) and the graded broken stone stabilizing layer (5) to tightly seal the top parts of the reinforced concrete road foundation trench and the graded broken stone stabilizing layer;
constructing an asphalt concrete layer (7), and paving 4-6cm thick asphalt concrete on the top surface of the asphalt waterproof seal layer (6);
step eight, constructing a graded broken stone bottom ballast layer (8), and paving the graded broken stone bottom ballast layer (8) with the thickness of 15-25cm on the upper part of the asphalt concrete layer (7) to be used as a protective layer of the asphalt concrete layer (7);
and step nine, paving a steel rail (11), and sequentially paving a sleeper (10) and the steel rail (11) on the graded broken stone bottom ballast layer (8) through a ballast (9) to complete roadbed structure construction.
5. A construction method according to claim 4, characterized in that: in the first step, the dredging and filling layer (1) has a filling depth of 0.5-3.0m, a filling width larger than the designed roadbed width by 0.5-1.0m on one side, and the filling width is enlarged downwards at an angle of 30-45 degrees to ensure the stability of the filling slope, and the filling construction adopts layered filling and layered compaction, and the thickness of the single-layer filling is 0.3-0.5 m.
6. A construction method according to claim 4, characterized in that: in the fourth step, the asphalt waterproof layer (4) needs to be sprayed and constructed in two layers, and the spraying amount of the first layer of asphalt waterproof coating is 1.2-1.5L/m2The spraying amount of the second layer of asphalt waterproof coating is 0.6-0.8L/m2。
7. A construction method according to claim 4, characterized in that: and fifthly, filling and compacting the medium-grade gravel stabilizing layer (5) in layers, wherein the filling and compacting thickness of each layer is between 20 and 25 cm.
8. A construction method according to claim 4, characterized in that: in the sixth step, the asphalt waterproof sealing layer (6) needs to be sprayed in two layers for construction, firstly, MC1 asphalt waterproof coating is sprayed on the top surfaces of the reinforced concrete road foundation trench (3) and the graded broken stone stabilizing layer (5) for capping, and the spraying amount is 0.9-1.0L/m2Ensuring that the MC1 asphalt waterproof paint permeates into the graded broken stone stabilizing layer (5) for 2-3cm, and then spreading a second layer of emulsified asphalt waterproof paint with the spraying amount of 1.2-1.3L/m2And then spreading a gravel layer, wherein the thickness of the gravel layer is 1.5cm, the particle size of the gravel is 5-10mm, the ratio of the gravel is more than 90%, and the content of the stone powder with the particle size of less than 0.075mm is not more than 1.0%, and finally forming the asphalt gravel sealing layer with the thickness of 1.5 cm.
9. A construction method according to claim 4, characterized in that: and in the third step, the reinforced concrete road foundation groove (3) reinforcement comprises longitudinal and transverse steel bars and U-shaped road foundation channel steel bars, the arrangement intervals of the longitudinal and transverse steel bars are 12-15cm, and the diameter of each steel bar is 10 mm.
10. A construction method according to claim 4, characterized in that: in the third step, the concrete pouring thickness of the reinforced concrete pavement foundation trench (3) is 20-30cm, and the concrete is C35 concrete and is added with a rust inhibitor and a waterproof compacting agent.
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