阅读说明：本技术 一种高速铁路装配式聚氨酯固化道床的施工方法 (Construction method of assembled polyurethane solidified track bed of high-speed railway ) 是由 张卫周 田维平 李育朝 孙军红 杨宏伟 王会军 董占虎 阳大勇 王钰 陈效明 颜 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种高速铁路装配式聚氨酯固化道床的施工方法,该方法包括：放样轨枕控制边线,划线标注轨枕间距控制线及轨排组安装,轨排组起升及支撑,安设支撑架和粗调轨排组,装配式聚氨酯固化道床模板安装,装配式聚氨酯固化道床轨排组精调,装配式聚氨酯固化道床轨排组固定,装配式聚氨酯固化道床调整层施工,复测,拆除轨排框架和支撑架,安装装配式聚氨酯固化道床的钢轨和扣件,回填道砟和成品保护,得到高速铁路装配式聚氨酯固化道床。本发明通过将轨排框架和支撑架相结合,调整方便,通过直接预制聚氨酯固化轨枕,安装方便,通过将混凝土调整层一次浇筑完成,保证了道床质量,适用于高速铁路中路基、桥梁、隧道装配式聚氨酯固化道床施工。(The invention discloses a construction method of a fabricated polyurethane solidified track bed of a high-speed railway, which comprises the following steps: laying out a sleeper control sideline, marking out and marking a sleeper interval control line and installing a track panel group, lifting and supporting the track panel group, installing a support frame and a rough-adjusting track panel group, installing an assembly type polyurethane curing track bed template, finely adjusting the assembly type polyurethane curing track bed track panel group, fixing the assembly type polyurethane curing track bed track panel group, constructing an assembly type polyurethane curing track bed adjusting layer, retesting, removing a track panel frame and the support frame, installing a steel rail and a fastener of the assembly type polyurethane curing track bed, backfilling a railway ballast and protecting a finished product, and thus obtaining the assembly type polyurethane curing track bed of the high-speed railway. The track bed is convenient to adjust by combining the track panel frame and the support frame, convenient to install by directly prefabricating the polyurethane curing sleeper, ensures the quality of the track bed by pouring the concrete adjusting layer at one time, and is suitable for the construction of the assembled polyurethane curing track bed of the roadbed, the bridge and the tunnel in the high-speed railway.)

1. A construction method of a fabricated polyurethane solidified track bed of a high-speed railway is characterized by comprising the following steps:

step one, lofting a sleeper control sideline:

measuring the center line, the elevation and the flatness of the foundation surface of a roadbed section, a bridge section and a tunnel section of the high-speed railway to be installed, measuring and placing a track center line control point according to the control point, and taking the track center line control point as a reference lofting sleeper control sideline;

secondly, marking and marking the sleeper interval control line and installing the track panel group:

marking a sleeper spacing control line on the basis of the sleeper control sideline in the step one, then laying the prefabricated polyurethane cured sleepers according to the sleeper spacing control line, then hanging the track panel framework on the laid prefabricated polyurethane cured sleepers, and then installing fasteners and inserting vertical support screws to assemble the track panel framework and the sleepers into a track panel group; the distance between the sleepers is 600mm or 650 mm; the prefabricated polyurethane curing sleeper comprises a sleeper and two polyurethane prefabricated blocks which are respectively arranged at two ends of the sleeper; the vertical support screw rod penetrates through the track panel frame and the sleeper and extends out of the lower part of the sleeper;

step three, lifting and supporting the track panel group:

lifting the track panel group obtained in the step two, then placing a steel gasket under each vertical supporting screw rod, adjusting the vertical supporting screw rods downwards, supporting the track panel group, and connecting the adjacent supported track panel groups by using a steel rail connecting clamp;

step four, installing a support frame and a rough adjusting track panel group:

installing a track panel group support frame in the middle of the supported track panel group connected in each step three, and coarsely adjusting the position of the track panel group by adopting the track panel group support frame;

step five, mounting the assembled polyurethane curing ballast bed template:

installing an adjusting layer longitudinal template and an adjusting layer transverse drainage channel template net on a roadbed at the lower part of the track panel group after coarse adjustment in the fourth step, wherein the longitudinal template is installed according to a sleeper control sideline, the distance between two parallel longitudinal templates is not less than 2800mm, the distance between two adjacent transverse drainage channel template nets is 6m, when the distance between sleepers is 600mm, the width of the adjusting layer transverse drainage channel template net is 90 mm-110 mm, and when the distance between sleepers is 650mm, the width of the adjusting layer transverse drainage channel template net is 140 mm-160 mm; the bottoms of the longitudinal template and the transverse drainage channel template nets are blocked by dry and hard mortar;

step six, accurately adjusting the track panel group of the assembled polyurethane curing track bed:

fine adjustment is carried out on the track panel group provided with the template in the fifth step;

seventhly, fixing the assembled polyurethane curing track bed rail row group:

fixing the track panel group finely adjusted in the sixth step;

step eight, construction of an adjusting layer of the assembled polyurethane curing ballast bed:

pouring a concrete adjusting layer into the lower side template of the track panel group fixed in the seventh step, and removing the template after the concrete is solidified to obtain the concrete adjusting layer;

step nine, retesting:

retesting the track panel group after the concrete adjusting layer is poured in the step eight;

step ten, dismantling the track panel frame and the support frame:

dismantling the track panel frame and the track panel group support frame in the track panel group retested in the ninth step;

eleven, installing steel rails and fasteners of the assembled polyurethane curing track bed:

pushing the long steel rail to be in place on the sleeper in the track panel group after the track panel frame and the track panel group support frame are removed in the step ten by adopting a pushing method, and then fixing by adopting a fastener to obtain a track bed on which the steel rail is installed;

step twelve, backfilling ballast and protecting finished products:

and backfilling the inter-sleeper of the track bed with the mounted steel rails and two sides of the concrete adjusting layer obtained in the step eleven by adopting special-grade railway ballast to obtain the fabricated polyurethane cured track bed of the high-speed railway.

2. The method as claimed in claim 1, wherein the measurement is performed according to CP III control points in the first step, the control points of the center line of the track are arranged at intervals of 10m in a straight section, and the control points of the center line of the track are arranged at intervals of 5m in a curved section.

3. The construction method of the fabricated polyurethane curing track bed of the high-speed railway according to claim 1, wherein in the second step, the prefabricated polyurethane curing sleepers and the track panel frames are transported by automobiles in the tunnel section and the roadbed section and are hoisted and arranged by truck cranes along with the automobiles; the method comprises the following steps that (1) a bridge section is hoisted to a track flat car on an adjacent line by a truck crane, transported to a distribution point and distributed by a small excavator on the flat car; the deviation of the track gauge in the track panel group is less than 1mm, and the deviation of the sleeper spacing is less than 10 mm.

4. The construction method of the assembled polyurethane curing track bed of the high-speed railway according to claim 1, wherein the lifting process of the rail row group in the third step is as follows: 4 hand rail lifting machines are arranged on each rail row group and symmetrically supported beside each rail row group, and then the 4 hand rail lifting machines simultaneously lift the rail row group to lift.

5. The construction method of the fabricated polyurethane curing track bed for the high-speed railway according to claim 1, wherein the coarse adjustment in the fourth step is as follows: the track panel group rough adjustment is carried out through a hand-operated track jack, a track panel frame, a track panel group support frame and an adjustable diagonal bracing rod; and the height deviation of the track panel group after coarse adjustment is less than 5mm, and the position deviation of the central line is less than 5 mm.

6. The method for constructing the fabricated polyurethane curing track bed of the high-speed railway according to claim 1, wherein the fine adjustment in the sixth step is based on a CP III track control network, and the total station free standing survey is adopted, and meets the following requirements: the total station has automatic target search, automatic collimation and automatic observation functions, and the precision is not lower than 1' and 1mm + 2X 10^-6And D, setting up the total station freely, and observing at least 4 pairs of CP III control networks, wherein the total station is set up freely near the line center line and is positioned between the front and back 2 pairs of CP III control networks.

7. The construction method of the assembled polyurethane curing track bed of the high-speed railway according to claim 1, wherein in the seventh step, the track row group is fixed in a tunnel section and a bridge section by using cable grooves on two sides, and the track row group is fixed in a roadbed section by embedding sleeper wood.

8. The construction method of the fabricated polyurethane curing track bed for the high-speed railway according to claim 1, wherein the step eight of pouring the concrete adjusting layer comprises the following steps: pre-wetting the surface of a filling layer 2h before concrete pouring, then manually matching a chute to pour the concrete, obliquely inserting a small-caliber vibrating rod into the bottom of a polyurethane precast block to vibrate in the pouring process, covering and sprinkling water for curing a poured concrete adjusting layer, wherein the curing time is not less than 7 days, and the temperature difference between the curing water temperature and the concrete surface temperature is less than 15 ℃; the slump of the concrete is 160-200 mm, the air content is 2-4%, the mold-entering temperature of the concrete is 5-30 ℃, and the temperature difference between newly poured and adjacent hardened concrete is not more than 15 ℃; the width of the concrete adjusting layer is 2790-2810 mm, and the polyurethane precast block is embedded into the concrete adjusting layer by 20-50 mm; the concrete solidification standard is 12 hours after pouring or the concrete strength reaches more than 2.5 MPa.

Technical Field

The invention belongs to the technical field of high-speed railway traffic engineering, and particularly relates to a construction method of a fabricated polyurethane solidified track bed of a high-speed railway.

Background

At present, the ballasted tracks adopted by foreign high-speed railways mainly comprise France and Spain. The operation speed of a ballasted track line in French China generally reaches 270 km/h-300 km/h, the highest operation speed reaches 320km/h, the highest test speed is 574.8km/h, the design speed of the ballasted track line of the high-speed railway under construction is 360km/h, and the planned operation speed is more than 320 km/h; the highest operation speed of the ballast line of the Spain high-speed railway also reaches 310 km/h.

The ballast track of the high-speed railway in China lacks practical experience of operation speed of more than 250km/h, the current highest operation speed is still 250km/h, wherein the railway with the speed of 250km per hour and below is designed to generally adopt ballast tracks, such as special for Qin Shen passengers, special for Hening passengers, special for Duwu passengers, special for Shitai passengers and the like; the railway with the speed more than 250km per hour is designed mainly by using ballastless tracks, and the ballasted tracks are adopted at special work points such as individual large-span structural bridges, movable fracture zones or goafs, but the speed of the ballasted track section is limited according to 250 km/h.

Compared with the world leading level, the research and application of the ballast track technology of the high-speed railway in China have a large gap. Although three ballast track high-speed scientific research tests are successively developed in the early stage, the tests mainly aim at local work points and are single in working condition, and systematic test research is lacked.

In the prior art, the polyurethane cured track bed is usually constructed on site, the pouring quality of the polyurethane cured track bed is greatly influenced by the cleanness of railway ballast and the construction quality of the track bed, and an integral construction method of an assembly type polyurethane cured track bed is not provided, so that a construction method of the assembly type polyurethane cured track bed of the high-speed railway is required.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a construction method of a fabricated polyurethane cured ballast bed of a high-speed railway aiming at the defects of the prior art. The method is developed on the basis of a cast-in-place polyurethane curing track bed, the prefabricated polyurethane curing sleeper replaces cast-in-place or assembled polyurethane materials, the prefabricated polyurethane curing track bed structure is an assembly type polyurethane curing track bed structure with stronger lower foundation adaptability, the advantages of the cast-in-place polyurethane curing track bed are kept, and meanwhile, the method has the advantages of being capable of realizing factory prefabrication, assembly type construction, unit type maintenance and the like of the structure.

In order to solve the technical problems, the invention adopts the technical scheme that: a construction method of a fabricated polyurethane solidified track bed of a high-speed railway is characterized by comprising the following steps:

step one, lofting a sleeper control sideline:

measuring the center line, the elevation and the flatness of the foundation surface of a roadbed section, a bridge section and a tunnel section of the high-speed railway to be installed, measuring and placing a track center line control point according to the control point, and taking the track center line control point as a reference lofting sleeper control sideline;

secondly, marking and marking the sleeper interval control line and installing the track panel group:

marking a sleeper spacing control line on the basis of the sleeper control sideline in the step one, then laying the prefabricated polyurethane cured sleepers according to the sleeper spacing control line, then hanging the track panel framework on the laid prefabricated polyurethane cured sleepers, and then installing fasteners and inserting vertical support screws to assemble the track panel framework and the sleepers into a track panel group; the distance between the sleepers is 600mm or 650 mm; the prefabricated polyurethane curing sleeper comprises a sleeper and two polyurethane prefabricated blocks which are respectively arranged at two ends of the sleeper; the vertical support screw rod penetrates through the track panel frame and the sleeper and extends out of the lower part of the sleeper;

step three, lifting and supporting the track panel group:

lifting the track panel group obtained in the step two, then placing a steel gasket under each vertical supporting screw rod, adjusting the vertical supporting screw rods downwards, supporting the track panel group, and connecting the adjacent supported track panel groups by using a steel rail connecting clamp;

step four, installing a support frame and a rough adjusting track panel group:

installing a track panel group support frame in the middle of the supported track panel group connected in each step three, and coarsely adjusting the position of the track panel group by adopting the track panel group support frame;

step five, mounting the assembled polyurethane curing ballast bed template:

installing an adjusting layer longitudinal template and an adjusting layer transverse drainage channel template net on a roadbed at the lower part of the track panel group after coarse adjustment in the fourth step, wherein the longitudinal template is installed according to a sleeper control sideline, the distance between two parallel longitudinal templates is not less than 2800mm, the distance between two adjacent transverse drainage channel template nets is 6m, when the distance between sleepers is 600mm, the width of the adjusting layer transverse drainage channel template net is 90 mm-110 mm, and when the distance between sleepers is 650mm, the width of the adjusting layer transverse drainage channel template net is 140 mm-160 mm; the bottoms of the longitudinal template and the transverse drainage channel template nets are blocked by dry and hard mortar;

step six, accurately adjusting the track panel group of the assembled polyurethane curing track bed:

fine adjustment is carried out on the track panel group provided with the template in the fifth step;

seventhly, fixing the assembled polyurethane curing track bed rail row group:

fixing the track panel group finely adjusted in the sixth step;

step eight, construction of an adjusting layer of the assembled polyurethane curing ballast bed:

pouring a concrete adjusting layer into the lower side template of the track panel group fixed in the seventh step, and removing the template after the concrete is solidified to obtain the concrete adjusting layer;

step nine, retesting:

retesting the track panel group after the concrete adjusting layer is poured in the step eight;

step ten, dismantling the track panel frame and the support frame:

dismantling the track panel frame and the track panel group support frame in the track panel group retested in the ninth step;

eleven, installing steel rails and fasteners of the assembled polyurethane curing track bed:

pushing the long steel rail to be in place on the sleeper in the track panel group after the track panel frame and the track panel group support frame are removed in the step ten by adopting a pushing method, and then fixing by adopting a fastener to obtain a track bed on which the steel rail is installed;

step twelve, backfilling ballast and protecting finished products:

and backfilling the inter-sleeper of the track bed with the mounted steel rails and two sides of the concrete adjusting layer obtained in the step eleven by adopting special-grade railway ballast to obtain the fabricated polyurethane cured track bed of the high-speed railway.

Firstly, laying a plurality of prefabricated polyurethane cured sleepers, then installing a track panel frame, enabling the plurality of prefabricated polyurethane cured sleepers and one track panel frame to form a track row group, then lifting the track row groups for connection, adjusting the positions of the track row group, then pouring concrete, and backfilling railway ballast to obtain a high-speed railway fabricated polyurethane cured track bed; the track panel frame and the support frame are combined, so that the track panel frame and the support frame are economical and practical, the construction cost is saved, the problem that the track panel frame deforms to influence the track bed quality due to the fact that the weight of a prefabricated polyurethane solidified sleeper is large is effectively solved, the concrete adjusting layer is poured at one time, the problem of height reduction caused by the fact that a poured finished track bed track compresses a polyurethane prefabricated block is solved, the track bed quality is guaranteed, the track panel group is reinforced, the problem of instability in fixing of the track panel group at the roadbed section is effectively solved, the track panel is economical and reasonable, and the requirements of stability after the track panel is assembled and the construction of a polyurethane elastic solidified track bed are met; the invention adopts line production, the construction process is easy to master, the operability is strong, the labor intensity is reduced, and the construction quality is ensured.

The construction method of the fabricated polyurethane solidified track bed of the high-speed railway is characterized in that in the first step, the measurement is carried out according to CP III control points, the track center line control points are arranged at intervals of 10m in a straight line section, and the track center line control points are arranged at intervals of 5m in a curve section. The invention carries out measurement according to the CP III control point, has the advantage of accurate measurement, confirms that all data conform to relevant standard regulations, and is convenient for subsequent installation calibration by setting the track center line control point.

The construction method of the assembled polyurethane curing track bed of the high-speed railway is characterized in that in the second step, the prefabricated polyurethane curing sleepers and the track panel frames are transported by automobiles in the tunnel section and the roadbed section and are hoisted and arranged by truck cranes along with the automobiles; the method comprises the following steps that (1) a bridge section is hoisted to a track flat car on an adjacent line by a truck crane, transported to a distribution point and distributed by a small excavator on the flat car; the deviation of the track gauge in the track panel group is less than 1mm, and the deviation of the sleeper spacing is less than 10 mm. Because the weight of the prefabricated polyurethane solidified sleeper is large, in order to improve the fine adjustment quality, protect the quality of the prefabricated polyurethane solidified sleeper and reduce the labor intensity during adjustment, the sleeper interval control line is marked out by marking lines at the laying position according to the designed sleeper interval before sleeper arrangement, then an automobile or a flat car is adopted for transportation and hoisting, manpower is saved by planning in advance, and the stability of the integral structure of the assembled polyurethane solidified track bed is ensured by controlling the deviation of the track gauge in a track panel group and the deviation of the sleeper interval.

The construction method of the fabricated polyurethane solidified track bed of the high-speed railway is characterized in that the process of lifting the rail row set in the third step is as follows: 4 hand rail lifting machines are arranged on each rail row group and symmetrically supported beside each rail row group, and then the 4 hand rail lifting machines simultaneously lift the rail row group to lift. The invention ensures that each rail panel group is stressed uniformly by lifting 4 hand-operated track lifting machines simultaneously, prevents the defects of uneven stress and deformation of the rail panel group caused by lifting by adopting the vertical supporting screw rod of the rail panel frame,

the construction method of the assembled polyurethane solidified track bed of the high-speed railway is characterized in that the coarse adjustment process in the fourth step is as follows: the track panel group rough adjustment is carried out through a hand-operated track jack, a track panel frame, a track panel group support frame and an adjustable diagonal bracing rod; and the height deviation of the track panel group after coarse adjustment is less than 5mm, and the position deviation of the central line is less than 5 mm. In the invention, the track jack and the track panel frame transverse and height adjusting device are adopted for roughly adjusting the track panel group, because the weight of each track panel group after the track panel group is lifted and supported in place is extremely large, in order to ensure the strength, rigidity and stability of the track panel group support, a track panel group support frame is arranged in the middle of each track panel frame in which the track panel group is supported in place, so that the vertical support screw rods of the track panel group support frame and the support screw rods of the track panel frame are stressed simultaneously, the stability is improved, the deviation of the track panel group is reduced, and the stability of the integral structure of the assembled polyurethane curing track bed is ensured by controlling the height deviation and the central line position deviation of the track panel group.

The construction method of the fabricated polyurethane solidified track bed of the high-speed railway is characterized in that in the sixth step, the fine adjustment is carried out by taking a CP III track control network as a basis and adopting a total station instrument to freely set up stations for measurement, and the total station instrument freely set up stations for measurement meets the following requirements: the total station has automatic target search, automatic collimation and automatic observation functions, and the precision is not lower than 1' and 1mm + 2X 10^-6And D, setting up the total station freely, and observing at least 4 pairs of CP III control networks, wherein the total station is set up freely near the line center line and is positioned between the front and back 2 pairs of CP III control networks. The invention adopts a CP III track control network as a basis, adopts a total station instrument to freely set up a station for measurement, has the advantage of accurate measurement, confirms that all data conform to relevant standard regulations, the precision of the total station instrument angle measurement is 1' (Hz, V), and the precision/measurement time of the distance measurement is as follows: 1mm + 2X 10^-6D/is typically s.

The construction method of the fabricated polyurethane cured track bed of the high-speed railway is characterized in that in the seventh step, the track row group is fixed in the tunnel section and the bridge section by using cable grooves on two sides, and the track row group is fixed in the roadbed section in a mode of embedding sleeper wood.

The construction method of the fabricated polyurethane curing ballast bed of the high-speed railway is characterized in that the process of pouring the concrete adjusting layer in the step eight is as follows: pre-wetting the surface of a filling layer 2h before concrete pouring, then manually matching a chute to pour the concrete, obliquely inserting a small-caliber vibrating rod into the bottom of a polyurethane precast block to vibrate in the pouring process, covering and sprinkling water for curing a poured concrete adjusting layer, wherein the curing time is not less than 7 days, and the temperature difference between the curing water temperature and the concrete surface temperature is less than 15 ℃; the slump of the concrete is 160-200 mm, the air content is 2-4%, the mold-entering temperature of the concrete is 5-30 ℃, and the temperature difference between newly poured and adjacent hardened concrete is not more than 15 ℃; the width of the concrete adjusting layer is 2790-2810 mm, and the polyurethane precast block is embedded into the concrete adjusting layer by 20-50 mm; the concrete solidification standard is 12 hours after pouring or the concrete strength reaches more than 2.5 MPa.

Compared with the prior art, the invention has the following advantages:

1. the track bed has the advantages that the track panel frame and the supporting frame are combined, the track panel frame and the supporting frame are economical and practical, the construction cost is saved, the problem that the track panel frame deforms to influence the track bed quality due to the fact that the weight of the prefabricated polyurethane solidified sleeper is large is effectively solved, the track bed and the polyurethane prefabricated block are directly prefabricated into the prefabricated polyurethane solidified sleeper, field assembly is not needed, installation is convenient, construction efficiency is improved, the concrete adjusting layer is poured at one time, the problem of height reduction caused by the fact that the poured finished track bed track compresses the polyurethane prefabricated block is solved, and the track bed quality is guaranteed.

2. The invention effectively solves the problem of instability of the track panel group at the roadbed section by reinforcing the track panel group, is economic and reasonable, and meets the requirements of stability after the track panel is assembled and the construction of the assembled polyurethane curing track bed.

3. The ballast macadam is solidified by the polyurethane material, so that the resistance of a ballast bed is improved, the stability of a seamless line is good, the accumulated deformation under the action of load is small, the maintenance workload is small, the polyurethane material is used as a flexible connecting structure, the coordination deformation capability is strong, the adaptability to the deformation of the foundation under the line is good, and the good elasticity can be kept for a long time.

4. The fabricated polyurethane curing track bed is mainly composed of steel rails, a prefabricated polyurethane curing sleeper and a concrete adjusting layer, is developed on the basis of a cast-in-place polyurethane curing track bed, is a fabricated polyurethane curing track bed structure with stronger lower foundation adaptability by replacing cast-in-place polyurethane materials with the prefabricated polyurethane curing sleeper, and has the characteristics of realizing factory prefabrication, fabricated construction, unit maintenance and the like of the structure while keeping the advantages of the cast-in-place polyurethane curing track bed.

5. The invention adopts a unitized structure, can adopt an adjusting fastener to replace a track bed unit block for graded maintenance, can be completed in a skylight point, is convenient and quick, and ensures the quality of products by finely controlling raw materials, process parameters and environmental conditions when the prefabricated polyurethane cured sleeper is produced in a factory.

6. According to the invention, the prefabricated polyurethane cured sleeper is finely adjusted through the track panel frame, and the broken stone ballast is backfilled after the adjusting layer is cast in situ, so that the large-machine tamping and stabilizing operation is not required, and the energy-saving and high-efficiency effects are achieved.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

FIG. 1 is a process flow diagram of the fabricated polyurethane-cured ballast bed construction method of the present invention.

FIG. 2 is a schematic view showing the structure of the fabricated polyurethane cured track bed of the present invention.

Description of reference numerals:

1-concrete adjusting layer; 2, prefabricating a polyurethane curing sleeper; 2-1-sleeper;

2-polyurethane precast block; 3, steel rails; 4-ballast.

Detailed Description

As shown in FIG. 1, the concrete construction method for preparing the fabricated polyurethane solidified track bed of the invention comprises the following steps: laying out a sleeper control sideline, marking out and marking a sleeper interval control line and installing a track panel group, lifting and supporting the track panel group, installing a support frame and a rough-adjusting track panel group, installing an assembly type polyurethane curing track bed template, finely adjusting the assembly type polyurethane curing track bed track panel group, fixing the assembly type polyurethane curing track bed track panel group, constructing an assembly type polyurethane curing track bed adjusting layer, retesting, removing a track panel frame and the support frame, installing a steel rail and a fastener of the assembly type polyurethane curing track bed, backfilling a railway ballast and protecting a finished product, and thus obtaining the assembly type polyurethane curing track bed of the high-speed railway.

As shown in fig. 2, the fabricated polyurethane curing track bed comprises a concrete adjusting layer 1 arranged on the upper portion of a foundation, a prefabricated polyurethane curing sleeper 2 is arranged on the concrete adjusting layer 1, the prefabricated polyurethane curing sleeper 2 comprises a sleeper 2-1 and two polyurethane precast blocks 2-2 respectively arranged at two ends of the sleeper 2-1, the two polyurethane precast blocks 2-2 are respectively embedded into the concrete adjusting layer 1, steel rails 3 are distributed on the prefabricated polyurethane curing sleeper 2, and ballast 4 is filled between the prefabricated polyurethane curing sleeper 2 and at two sides of the concrete adjusting layer 1.

The construction method of the fabricated polyurethane solidified track bed for the high-speed railway comprises the following steps:

step one, lofting a sleeper control sideline:

measuring the center line, the elevation and the flatness of the foundation surface of a roadbed section, a bridge section and a tunnel section of the high-speed railway to be installed, measuring and placing a track center line control point according to the control point, and taking the track center line control point as a reference lofting sleeper control sideline; the measurement is carried out according to CP III control points, the track center line control points are arranged at intervals of 10m in a straight line section, and the track center line control points are arranged at intervals of 5m in a curve section;

it should be noted that, according to the length of the bridge and the width of the beam gap, the distance between the sleepers is calculated and adjusted, the positions of the sleepers at the beam ends are marked, and the concrete adjusting layer is strictly forbidden to span the beam gap.

Secondly, marking and marking the sleeper interval control line and installing the track panel group:

marking a sleeper spacing control line on the basis of the sleeper control sideline in the step one, then laying the prefabricated polyurethane cured sleepers according to the sleeper spacing control line, then hanging the track panel framework on the laid prefabricated polyurethane cured sleepers, and then installing fasteners and inserting vertical support screws to assemble the track panel framework and the sleepers into a track panel group; the distance between the sleepers is 600mm or 650 mm; the prefabricated polyurethane curing sleeper comprises a sleeper and two polyurethane prefabricated blocks which are respectively arranged at two ends of the sleeper; the vertical support screw rod penetrates through the track panel frame and the sleeper and extends out of the lower part of the sleeper; the prefabricated polyurethane cured sleeper and the track panel frame are transported by vehicles in the tunnel section and the roadbed section and are hoisted and laid by truck cranes on vehicles; the method comprises the following steps that (1) a bridge section is hoisted to a track flat car on an adjacent line by a truck crane, transported to a distribution point and distributed by a small excavator on the flat car; the deviation of the track gauge in the track panel group is less than 1mm, and the deviation of the distance between sleepers is less than 10 mm;

it should be noted that, before the track panel group is installed, the sleeper rail bearing platform and the track panel frame are cleaned up, and when the track panel group is assembled, the sleeper installation marks marked on the tool rails in the track panel frame are aligned with the central lines of the arranged sleeper bolt holes, and the fastening fastener ensures that the fastening pressure reaches the design requirement, and all parts of the fastener are closely attached.

It should be noted that the transition is performed at the connection position between the 650mm sleeper spacing and the 600mm sleeper spacing by adopting 650mm, 645mm, 630mm, 615mm and 610mm in sequence.

Step three, lifting and supporting the track panel group:

lifting the track panel group obtained in the step two, then placing a steel gasket under each vertical supporting screw rod, adjusting the vertical supporting screw rods downwards, supporting the track panel group, and connecting the adjacent supported track panel groups by using a steel rail connecting clamp; the rail row group lifting process comprises the following steps: 4 hand-operated track lifting machines are arranged on each track panel group and symmetrically supported beside each track panel group, and then the 4 hand-operated track lifting machines simultaneously lift the groups to lift the track panel groups;

it should be noted that the vertical support rod at the lower strand side in the tunnel section is sleeved with a PVC pipe, and the vertical support leg of the track panel group support frame is sleeved in the PVC pipe.

It should be noted that, adjacent track panel groups are connected by a steel rail connecting clamp, a fastener at the connecting clamp is required to be installed in place, when a sleeper with a distance of 600mm is laid on each track panel frame with a length of 4.75m, a large rail gap of 100mm appears at a joint, a steel rail head is required to be arranged at the large rail gap, in addition, the steel rail connecting clamp is provided with six holes which are respectively connected with three holes on two adjacent track panel frame steel rails through bolts, and after the three holes on one clamp are connected with three holes on one track panel frame steel rail through bolts due to the appearance of the rail gap of 100mm, the other three holes are not aligned with three holes on the other track panel frame steel rail, so that the steel rail cannot be fastened, the remaining three holes are communicated into a U-shaped groove, the joint of the adjacent track panel frame steel rails is smooth, and no tooth dislocation or platform is required.

Step four, installing a support frame and a rough adjusting track panel group:

installing a track panel group support frame in the middle of the supported track panel group connected in each step three, and coarsely adjusting the position of the track panel group by adopting the track panel group support frame; the course of the coarse adjustment is as follows: the track panel group rough adjustment is carried out through a hand-operated track jack, a track panel frame, a track panel group support frame and an adjustable diagonal bracing rod; the height deviation of the track panel group after coarse adjustment is less than 5mm, and the position deviation of a central line is less than 5 mm;

it should be noted that, the adjustable direction of the diagonal bracing piece is placed at the vertical adjusting screw or the rail web at the end of the cross beam of the track panel frame: the tunnel section is drilled with holes and embedded with steel bars through the inverted arch surface and the direction of the support rods is adjusted by fixing the support rods through the ballast retaining walls, and the roadbed section is fixed with the support rods through embedding wood pillows between lines and protecting shoulders of the roadbed; the bridge section is through the pre-buried wooden pillow of line space and utilizing the fixed bracing piece of fender tiny fragments of stone, coal, etc. wall, utilize horizontal regulator, adjust the track panel frame central line to circuit central line department, utilize adjustment vertical screw rod to adjust track level, height.

Step five, mounting the assembled polyurethane curing ballast bed template:

installing an adjusting layer longitudinal template and an adjusting layer transverse drainage channel template net on a roadbed at the lower part of the track panel group after coarse adjustment in the fourth step, wherein the longitudinal template is installed according to a sleeper control sideline, the distance between two parallel longitudinal templates is not less than 2800mm, the distance between two adjacent transverse drainage channel template nets is 6m, when the distance between sleepers is 600mm, the width of the adjusting layer transverse drainage channel template net is 90 mm-110 mm, and when the distance between sleepers is 650mm, the width of the adjusting layer transverse drainage channel template net is 140 mm-160 mm; the bottoms of the longitudinal template and the transverse drainage channel template nets are blocked by dry and hard mortar;

it should be noted that, the clean up railway roadbed debris of clearance before the installation template, whether the inspection template state is good, should clean, no damage, no deformation, the template installation should be in the same direction as straight and perpendicular with substructure thing, and no wrong platform, wrong tooth phenomenon carry out template installation and reinforcement according to the template sideline position of lofting: the reinforcing template is reinforced by drilling holes on the filling layer surface of the tunnel section, reinforced template is reinforced by planting ribs on the roadbed base surface of the roadbed section, reinforced template is reinforced by drilling holes on the beam surface of the bridge section, dry and hard mortar is used as filler for plugging at the bottom of the template, the slurry leakage during concrete pouring is prevented, and the contact surface of the step template and concrete is cleaned up and coated with a release agent.

Step six, accurately adjusting the track panel group of the assembled polyurethane curing track bed:

fine adjustment is carried out on the track panel group provided with the template in the fifth step; the fine adjustment is based on a CP III track control network, and the total station is adopted for freely setting up the station for measurement, and the total station freely sets up the station for measurement and meets the following requirements: the total station has automatic target search, automatic collimation and automatic observation functions, and the precision is not lower than 1' and 1mm + 2X 10^-6D, the total station freely sets up the CP III control network that the station observes to be no less than 4 pairs, the total station freely sets up the station and locates near line midline and locates between 2 pairs of CP III control networks in front and at the back;

it should be noted that, after the survey stations are replaced, CP iii control networks observed by overlapping adjacent survey stations should not be less than 2 pairs, after the station is freely set, when the coordinate mismatch value exceeds the limit, the CP iii control networks exceeding the limit should be removed, but each CP iii control network freely set to participate in adjustment calculation should not be less than 6, after the fine adjustment is completed, no operation or personnel walking on the track row group should be performed, and after the track slab fine adjustment, because concrete is not poured in time, if: time exceeding 24h or temperature difference exceeding 15 ℃, and external force disturbance, such as: the adjacent track tamping or the adjacent track tamping is stable, the fine adjustment result is possibly influenced, the position precision of the track slab is required to be checked under the 3 conditions, and the CRTS III type track slab laying precision retest can be carried out by using a CP III free survey station method.

Seventhly, fixing the assembled polyurethane curing track bed rail row group:

fixing the track panel group finely adjusted in the sixth step; the rail row group is fixed by cable grooves on two sides at the tunnel section and the bridge section, and is fixed by pre-buried sleeper wood at the roadbed section

It should be noted that the tunnel section and the bridge section are fixed by ditches and cable troughs on two sides, and the roadbed section is fixed by embedding sleeper wood between two lines.

Step eight, construction of an adjusting layer of the assembled polyurethane curing ballast bed:

pouring a concrete adjusting layer into the lower side template of the track panel group fixed in the seventh step, and removing the template after the concrete is solidified to obtain the concrete adjusting layer; the process of pouring the concrete adjusting layer comprises the following steps: pre-wetting the surface of a filling layer 2h before concrete pouring, then manually matching a chute to pour the concrete, obliquely inserting a small-caliber vibrating rod into the bottom of a prefabricated polyurethane block to vibrate in the pouring process, covering and sprinkling water for curing a poured concrete adjusting layer, wherein the curing time is not less than 7 days, and the temperature difference between the curing water temperature and the concrete surface temperature is less than 15 ℃; the slump of the concrete is 160-200 mm, the air content is 2-4%, the mold-entering temperature of the concrete is 5-30 ℃, and the temperature difference between newly poured and adjacent hardened concrete is not more than 15 ℃; the width of the concrete adjusting layer is 2790-2810 mm, and the assembled polyurethane sleeper blocks are embedded into the concrete adjusting layer by 20-50 mm; the concrete solidification standard is 12 hours after pouring or the concrete strength reaches more than 2.5 MPa;

it should be noted that, when the formwork is removed, the connection of the longitudinal formworks should be loosened, and the formworks are manually removed one by one from back to front in sequence according to the construction direction.

Step nine, retesting:

retesting the track panel group after the concrete adjusting layer is poured in the step eight;

it should be noted that, during repeated measurement, under the environment without direct sunlight and with little temperature change, the track geometric state measuring instrument is adopted to cooperate with the total station, the track geometric state is retested and the measuring result is recorded, and the points with deviation exceeding the standard are marked and analyzed, so that the problems existing in the subsequent construction can be solved in time, and meanwhile, reference is provided for preparing and adjusting fasteners during track fine adjustment and arrangement.

Step ten, dismantling the track panel frame and the support frame:

dismantling the track panel frame and the track panel group support frame in the track panel group retested in the ninth step;

when the track panel frame and the track panel group support frame are dismantled, the track panel frame and the track panel group support frame are dismantled one by one from back to front according to the construction direction, the geometric dimensions of the frame and the support frame are checked in time after the track panel frame and the track panel group support frame are dismantled, and concrete or other pollutants attached to the rail bottom and the rail surface are removed; and hoisting the transporting track panel frame and the track panel group supporting frame by using a small excavator on the adjacent line flat car.

Eleven, installing steel rails and fasteners of the assembled polyurethane curing track bed:

pushing the long steel rail to be in place on the sleeper in the track panel group after the track panel frame and the track panel group support frame are removed in the step ten by adopting a pushing method, and then fixing by adopting a fastener to obtain a track bed on which the steel rail is installed;

it should be noted that when the long steel rail is pushed to be in place by the pushing method, the fasteners are separated from five by one, and after the pushing vehicle passes through the fasteners, the fasteners are manually supplemented.

Step twelve, backfilling ballast and protecting finished products:

and backfilling the inter-sleeper of the track bed with the mounted steel rails and two sides of the concrete adjusting layer obtained in the step eleven by adopting special-grade railway ballast to obtain the fabricated polyurethane cured track bed of the high-speed railway.

The special-grade railway ballast conforms to the standard of the special-grade railway ballast in TB/T2014-2008 railway ballast, the railway ballast is manually backfilled between sleepers, the two sides of a railway bed are backfilled by a ballast unloading vehicle after long rails are paved, the backfilled railway ballast is tamped and compacted by small-sized machinery, and the density of the tamped railway bed is not less than 1.6g/cm 3. The sections of the gravel beds of the roadbed, the bridge and the tunnel after backfilling meet the design requirements;

it should be noted that the subsequent construction enhances the protection of the finished products of the steel rail, the sleeper and the railway ballast, and prevents the steel rail from being scratched, the sleeper and the prefabricated polyurethane block from being damaged and the railway ballast from being polluted.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.