CN111593619A

CN111593619A - Construction method of urban rail transit plate type ballast bed structure

Info

Publication number: CN111593619A
Application number: CN202010479123.3A
Authority: CN
Inventors: 沈国芳; 张明; 鲁海龙; 李学亮; 马海民; 颜景润; 曹德志; 马鹏飞; 赵宗哲; 胡宗东
Original assignee: China Railway First Engineering Group Co Ltd; Xinyun Engineering Co Ltd of China Railway First Engineering Group Co Ltd
Current assignee: China Railway First Engineering Group Co Ltd; Xinyun Engineering Co Ltd of China Railway First Engineering Group Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-28

Abstract

The invention discloses a construction method of an urban rail transit slab type ballast bed structure, which comprises the following steps: firstly, constructing a track foundation control network of a track to be constructed; secondly, constructing a track foundation of the plate type track bed area to be constructed; thirdly, measuring a track central line control point of the lofting plate type track bed area to be constructed and track plate mounting side lines of a plurality of track plates; fourthly, laying a plurality of geotextile isolation layers in the plate type ballast bed area to be constructed; fifthly, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the slab track bed area to be constructed; sixthly, laying a track slab splicing layer of the slab type track bed area to be constructed; seventhly, pouring a plurality of self-compacting concrete slabs of the slab track bed area to be constructed; and eighthly, installing the steel rail and the fastener of the plate type track bed area to be constructed. The invention can improve the fine adjustment precision of the track slab, ensure the assembly precision of the track slab, and improve the forming quality of the self-compacting concrete slab by improving the grouting condition of the self-compacting concrete, thereby improving the construction quality of the plate type turnout structure.

Description

Construction method of urban rail transit plate type ballast bed structure

Technical Field

The invention belongs to the technical field of urban rail transit engineering, and particularly relates to a construction method of an urban rail transit slab type ballast bed structure.

Background

When the traditional integral ballast bed of the urban rail transit is constructed, basically all concrete structures are cast in situ, so that the environment is polluted, the manufacturing noise is generated, the labor intensity of workers is increased, the construction operation environment is poor, and the quality control means is weak. Along with the rapid development of modern high-speed railways, ballastless tracks are gradually applied to urban rail transit, and meanwhile, a plate type track bed structure of the urban rail transit can be used as an improvement of a track bed structure aiming at the settlement of the track bed structure, and has obvious advantages in the aspects of planning and designing of the urban rail transit, and upgrading and reconstruction of a vibration reduction structure and the track bed structure. However, urban rail transit is different from high-speed railway rails, and has differences in design technical standards, working condition boundary conditions, environmental vibration reduction and noise reduction requirements and the like; the number of the track slabs in the slab track bed structure is large, so that the track slabs are difficult to adjust in place quickly and accurately by adopting a traditional track slab fine adjustment mode in the process of assembling a plurality of track slabs, and the construction period is influenced; meanwhile, when a self-compacting concrete layer below the track slab is cast and formed in situ, one-time casting is required, and multiple times of casting cannot be performed, and the phenomena of non-compacting casting, pipe blockage, pipe explosion and the like are easily caused by adopting the traditional method of pumping concrete, so that the engineering quality is influenced; therefore, a construction method of the urban rail plate type turnout structure capable of improving the assembling precision of the rail plates is provided.

Disclosure of Invention

The invention aims to solve the technical problem that the defects in the prior art are overcome, and the construction method of the urban rail transit slab track bed structure is simple in structure and reasonable in design, can achieve the purpose of laying the high-precision rail foundation control net by measuring and checking the precision of the rail foundation control net, can provide the accurate three-dimensional coordinates of the rail foundation control points for fine adjustment of the rail slab, can ensure the assembling precision of the rail slab, and can improve the forming quality of the self-compacting concrete slab by improving the grouting condition of the self-compacting concrete, thereby improving the construction quality of the slab turnout structure.

In order to solve the technical problems, the invention adopts the technical scheme that: a construction method of an urban rail transit plate type track bed structure comprises a rail foundation arranged on a shield wall, a self-compacting concrete layer arranged above the rail foundation, a track plate assembly layer laid on the self-compacting concrete layer and a steel rail installed on the track plate assembly layer through fasteners, wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete plates which are sequentially arranged, the track plate assembly layer comprises a plurality of track plates which are sequentially arranged, the track plates correspond to the self-compacting concrete plates one by one, grouting holes, exhaust holes and observation holes are reserved on the top surface of each track plate, hoisting holes are arranged on the left side surface of each track plate and the right side surface of each track plate, a geotechnical cloth isolation layer is arranged between each track foundation and the self-compacting concrete plates, and a limiting groove is arranged on each track foundation, a limiting bulge matched with the limiting groove is arranged on the self-compacting concrete plate, and a self-compacting concrete plate reinforcing mesh is arranged in the self-compacting concrete plate; the method is characterized in that: the construction method comprises the following steps:

step one, constructing a track foundation control network of a track to be constructed:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points comprises two track foundation control points which are symmetrically distributed on shield walls on the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain a three-dimensional coordinate of each track foundation control point;

constructing a track foundation of the slab track bed area to be constructed;

step three, measuring and lofting an urban track central line control point and a plurality of track slab mounting side lines of the slab track bed area to be constructed:

301, taking the three-dimensional coordinates of the track foundation control points in the to-be-constructed slab track bed area as a reference, and performing measurement lofting of the track central line control points on the surface of the track foundation of the to-be-constructed slab track bed area;

step 302, taking the three-dimensional coordinates of the track foundation control points in the to-be-constructed slab track bed area as a reference, and performing measurement lofting on the track slab installation sidelines of the plurality of track slabs on the surface of the track foundation of the to-be-constructed slab track bed area; the number of the track slab mounting side lines of any one track slab is four, and the four track slab mounting side lines form a track slab assembling area together;

the four track plate mounting edge lines are respectively a track plate left side mounting edge line, a track plate right side mounting edge line, a track plate front side mounting edge line and a track plate rear side mounting edge line, the vertical distance between the track plate left side mounting edge line and the left side surface of the track plate is recorded as a left side mounting edge line offset distance L1, the vertical distance between the track plate right side mounting edge line and the right side surface of the track plate is recorded as a right side mounting edge line offset distance L2, and L2 is equal to L1; the front side mounting sideline of the track slab and the postThe vertical distance between the front side surfaces of the track plates is represented as a front mounting sideline offset distance L3, the vertical distance between the rear mounting sideline of the track plates and the rear side surface of the track plates is represented as a rear mounting sideline offset distance L4, and

step four, laying a plurality of geotextile isolation layers of the plate type ballast bed area to be constructed:

a plurality of geotextile isolation layers are respectively laid in a plurality of track slab splicing areas on a track foundation, and the geotextile isolation layers are made of polypropylene non-woven geotextiles;

step five, binding a plurality of self-compacting concrete slab reinforcing steel bar meshes of the plate type ballast bed area to be constructed:

respectively binding a plurality of self-compacting concrete layer reinforcing meshes in the assembling areas of the track slabs, and adjusting the heights of the self-compacting concrete layer reinforcing meshes in a mode of supporting a plurality of cushion blocks under the self-compacting concrete layer reinforcing meshes so that the self-compacting concrete layer reinforcing meshes are positioned in the middle of the self-compacting concrete slabs;

step six, laying a track slab assembly layer of a slab type track bed area to be constructed:

the installation method of the plurality of track slabs of the track slab assembly layer is the same, and the installation method of any one track slab specifically comprises the following steps:

step 601, preliminary positioning of the track slab:

the track slab is transferred to a track slab assembling area by adopting hoisting equipment and transportation equipment, four temporary supports are respectively placed at four corners of a self-compacting concrete layer reinforcing mesh in the track slab assembling area, and the heights of the temporary supports are higher than that of the self-compacting concrete layer reinforcing mesh; then, taking the four mounting edge lines of the track slab, which are subjected to lofting measurement in the step 302, as initial positioning reference lines of the track slab, and placing the track slab on the four temporary supports;

step 602, roughly adjusting the track slab:

installing three-way regulators in the hoisting holes, roughly adjusting the plane positions of the track slabs by taking the four track slab installation sidelines which are measured and lofted in the step 302 as rough adjustment reference lines of the track slabs, respectively measuring a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4 by using a triangular steel plate ruler, and stopping roughly adjusting the track slabs when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation sideline offset distance L4 are not more than +/-5 mm;

step 603, fine adjustment of the track slab:

6031, mounting prisms at four corners of a track board, and measuring three-dimensional coordinates of the four prisms by using a total station instrument with the three-dimensional coordinates of a track foundation control point positioned in a track bed area of the board to be constructed as a reference to obtain three-dimensional measured coordinates of the four corners of the track board;

6032, comparing the three-dimensional measured coordinates of the four corners of the track slab with the three-dimensional designed coordinates of the four corners of the track slab in real time by using a computer, and finely adjusting the elevation position and the plane position of the track slab by using at least two three-way adjusters; the adjustment sequence of the elevation position and the plane position of the fine adjustment track slab is as follows: firstly, adjusting the elevation position of the track slab and then adjusting the plane position of the track slab by adopting a diagonal adjustment mode;

when the size deviation between the three-dimensional measured coordinate of any one of the four three-dimensional measured coordinates of the track slab and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the track slab; when the size deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the track slab and the set three-dimensional design coordinates of the four corners does not exceed +/-1 mm, stopping fine adjustment of the track slab, and detaching the four prisms;

step seven, pouring a plurality of self-compacting concrete slabs of the slab track bed area to be constructed:

the pouring method of a plurality of self-compacting concrete slabs is the same, and the pouring method of any self-compacting concrete slab comprises the following steps:

701, arranging a self-compacting concrete layer forming formwork assembly around the self-compacting concrete layer reinforcing mesh to form a self-compacting concrete pouring cavity between the self-compacting concrete layer forming formwork assembly and the track plate;

the self-compacting concrete layer forming formwork assembly consists of two first side formworks which are arranged in parallel, two second side formworks which are arranged in parallel and four corner formworks which are used for connecting the first side formworks and the second side formworks, and exhaust pipes are arranged on the corner formworks;

step 702, buckling and fastening the track slab and the self-compacting concrete layer forming formwork assembly by adopting a plurality of buckling and pressing devices;

step 703, pouring and forming a self-compacting concrete layer:

installing a flow guide pipe in the grouting hole, pouring self-compacting concrete into the flow guide pipe by using a grouting device, and forming a self-compacting concrete slab;

step eight, installing steel rails and fasteners of the plate type track bed area to be constructed:

when the strength of the self-compacting concrete layer reaches more than 70% of the designed strength, the self-compacting concrete layer forming template assembly and the at least two three-way regulators are dismantled, and the self-compacting concrete layer is maintained; and then, installing steel rails and fasteners on the upper surface of the track slab assembly layer to complete the construction of the slab track bed structure of the to-be-constructed slab track bed area.

The construction method of the plate type track bed structure of the urban rail transit is characterized by comprising the following steps of: in the second step, the concrete process of constructing the track foundation of the plate type track bed area to be constructed is as follows:

step 201, arranging a plurality of side piles arranged along the length direction of the track foundation on two sides of a shield wall, wherein the distance between every two adjacent side piles is 5m, and the height of each side pile is 1.5 m;

step 202, measuring the height of the receiving surface of the track foundation and the central positions of a plurality of limiting grooves on the surface of the shield wall, and cleaning the surface of the shield wall;

step 203, binding a track foundation reinforcement cage, then erecting a track foundation forming template assembly on the peripheral side of the track foundation reinforcement cage to form a track foundation pouring cavity, and finally pouring concrete to form the track foundation.

The construction method of the plate type track bed structure of the urban rail transit is characterized by comprising the following steps of: in step 702, the buckling device includes a pressing beam for pressing the top surface of the track slab and two pressing vertical rods vertically installed at the end of the pressing beam, the two pressing vertical rods are respectively pressed on the outer side surfaces of the two second side templates, and both ends of the pressing beam are fixed in hand holes of the shield wall through turn buckle bolts.

The construction method of the plate type track bed structure of the urban rail transit is characterized by comprising the following steps of: in step 703, the cementer including be used for with honeycomb duct connection's grout funnel, setting are in the chute of grout funnel top with be used for to the hopper mixer of self-compaction concrete pours in the chute, the hopper mixer includes the frame, installs hopper in the frame with install rabbling mechanism in the hopper, rabbling mechanism includes fixed mounting and is in the mount on hopper top, fixed mounting motor on the mount and by motor drive's stirring rake, the bottom of grout funnel is provided with the first support that is used for the support, the bottom of chute is provided with the second support that is used for the support.

The construction method of the plate type track bed structure of the urban rail transit is characterized by comprising the following steps of: in step 703, the temperature of the self-compacting concrete poured into the draft tube ranges from 5 ℃ to 25 ℃, and the height of the draft tube ranges from 0.5m to 1 m.

The construction method of the plate type track bed structure of the urban rail transit is characterized by comprising the following steps of: the offset distance L1 of the left side installation sideline and the offset distance L2 of the right side installation sideline are positive integers, and the value range of the offset distance L1 of the left side installation sideline and the value range of the offset distance L2 of the right side installation sideline are both 50-100 mm.

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

1. according to the invention, the purpose of laying a high-precision track foundation control network can be realized by measuring and checking the precision of the track foundation control network, so that the precision of measurement lofting of track central line control points and track slab mounting sidelines of a plurality of track slabs can be improved, accurate three-dimensional coordinates of the track foundation control points can be provided for fine adjustment of the track slabs, and the splicing precision of the track slabs can be ensured; after the construction of the track foundation is finished, the track central line control point of lofting and the track slab installation side lines of a plurality of track slabs need to be measured, the track central line control point and the track slab installation side lines of the track slabs are used as the reference lines in the subsequent process of binding a plurality of self-compacting concrete slab reinforcing steel bar nets or assembling the plurality of track slabs, the number of the track slab installation side lines of any track slab is four, and the four track slab installation side lines form a track slab assembling area, so that the installation positions of the self-compacting concrete slab reinforcing steel bar nets can be ensured, and the assembling precision of the track slabs can be determined.

2. After the urban rail center line control point of the laying plate type track bed area to be constructed and the installation side lines of the plurality of track slabs are measured and laid, a plurality of geotextile isolation layers are laid in the plate type track bed area to be constructed, because the track foundation and the self-compaction concrete slabs are both of cast-in-place structures, if the geotextile isolation layers are not adopted for isolation, once the self-compaction concrete slabs which are cast have quality problems and need to be returned, the track foundation is greatly influenced, even the track foundation needs to be constructed again, therefore, the geotextile isolation layers are laid between the track foundation and the self-compaction concrete slabs, the geotextile isolation layers are used for isolating the track foundation and the self-compaction concrete slabs, the influence on the track foundation can be effectively avoided, and because the track foundation is provided with the limiting groove, the self-compaction concrete slabs are provided with the limiting bulge matched with the limiting groove, therefore, through the mutual cooperation between spacing recess and the spacing arch, can realize track basis and the purpose of self-compaction concrete slab close integration, can avoid self-compaction concrete slab to take place the phenomenon of dislocation on track basis.

3. The invention obtains the three-dimensional measured coordinates of four corners of the track slab by adopting the total station to measure the three-dimensional coordinates of four prisms, compared with the prior art, the position accuracy of each track basic control point is improved by measuring and checking the accuracy of the track basic control network, therefore, when the elevation position and the plane position of the track slab are finely adjusted, the fine adjustment accuracy of the track slab can be greatly improved by taking the three-dimensional coordinates of the track basic control points positioned in a track bed area of the slab type to be constructed as the reference, and meanwhile, through multiple times of measurement, when the elevation position of the track slab is adjusted firstly and then the plane position of the track slab is adjusted, the track slab can be finely adjusted in place quickly, and the working efficiency is improved.

4. The invention adopts a plurality of withholding devices to withhold and fasten the track plate and the self-compacting concrete layer forming template component, adopts a grouting device to pour the self-compacting concrete, the grouting device comprises a grouting funnel, a chute and a hopper mixer, the hopper mixer comprises a frame, a hopper and a stirring mechanism, when in actual use, the grouting funnel is supported on the top surface of the track plate by a first bracket, the chute is supported on the top surface of the track plate by a second bracket, the bottom end of the grouting funnel is connected with a flow guide pipe, the self-compacting concrete is formed by stirring and mixing in the hopper mixer, then the hopper mixer is lifted to the upper part of the chute by a lifting device, the self-compacting concrete is poured into the chute, the self-compacting concrete flows into the grouting funnel through the chute and flows into the flow guide pipe from the grouting funnel, thereby entering into the self-compacting concrete pouring cavity, need not adopt long distance pump sending pipeline, be difficult to appear pouring phenomenons such as incompact, stifled pipe, booster, the grout is effectual, can improve self-compaction concrete slab's shaping quality to guarantee the precision of assembling of track board, excellent in use effect.

5. Simple structure, reasonable design, low manufacturing cost and convenient popularization and application.

In summary, the track slab assembling device is simple in structure and reasonable in design, the purpose of laying the high-precision track foundation control net can be achieved by measuring and checking the precision of the track foundation control net, the three-dimensional coordinates of the track foundation control points can be accurately provided for fine adjustment of the track slab, the assembling precision of the track slab can be guaranteed, and meanwhile, the forming quality of the self-compacting concrete slab can be improved by improving the grouting condition of the self-compacting concrete, so that the construction quality of the slab turnout structure is improved.

The invention is described in further detail below with reference to the figures and examples.

Drawings

FIG. 1 is a flow chart of the construction method of the present invention.

Fig. 2 is a schematic structural view of the slab track bed structure of the present invention.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a sectional view B-B of fig. 2.

Fig. 5 is a schematic structural diagram of the track foundation of the present invention.

Fig. 6 is a schematic structural view of a self-compacting concrete panel according to the present invention.

Fig. 7 is a schematic diagram illustrating a positional relationship between the track slab and a mounting edge line of the track slab for lofting measurement according to the present invention.

Fig. 8 is a schematic view of the use state of the cast-in-place self-compacting concrete layer according to the present invention.

Description of reference numerals:

1-shield wall; 1-hand hole; 2-a track foundation;

2-1-a limiting groove; 2-track foundation reinforcement cage; 3, a track slab;

3-1-grouting holes; 3-2-exhaust holes; 3-observation hole;

3-4-hoisting holes; 4-self-compacting concrete slabs; 4-1-limiting protrusion;

4-2-self-compacting concrete slab reinforcing mesh; 5, a geotextile isolation layer;

6, steel rails; 7, a fastener; 8-1, installing a sideline on the left side of the track slab;

8-2, installing a sideline on the right side of the track slab; 8-3, installing a sideline on the front side of the track slab;

8-4, installing a sideline at the rear side of the track slab; 9-a track slab splicing area;

10-1 — a first side form; 10-2 — second side template;

10-3-corner template; 10-3-1-vent-pipe; 11-1-a compression beam;

11-2-pressing the vertical rod; 11-3-turnbuckle; 12-a flow guide pipe;

13-grouting hopper; 14 — a first support; 15-chute;

16 — a second support; 17-a frame; 17-1-lifting ear plates;

18-a hopper; 19-1-a mount; 19-2-motor;

19-3-stirring paddle; 20-a steel wire rope; 21-three-way regulator;

22-track base control points.

Detailed Description

As shown in fig. 1 to 6, the construction method of the urban rail transit slab track bed structure comprises a track foundation 2 arranged on a shield wall 1, a self-compacting concrete layer arranged above the track foundation 2, a track slab assembly layer laid on the self-compacting concrete layer, and a steel rail 6 installed on the track slab assembly layer through a fastener 7, wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete slabs 4 arranged in sequence, the track slab assembly layer comprises a plurality of track slabs 3 arranged in sequence, the track slabs 3 correspond to the self-compacting concrete slabs 4 one by one, grouting holes 3-1, exhaust holes 3-2 and observation holes 3-3 are reserved on the top surface of the track slab 3, hoisting holes 3-4 are arranged on the left side surface of the track slab 3 and the right side surface of the track slab 3, the construction method comprises the following steps of arranging a geotextile isolation layer 5 between the track foundation 2 and the self-compacting concrete slab 4, arranging a limiting groove 2-1 on the track foundation 2, arranging a limiting bulge 4-1 matched with the limiting groove 2-1 on the self-compacting concrete slab 4, and arranging a self-compacting concrete slab reinforcing mesh 4-2 in the self-compacting concrete slab 4, wherein the construction method comprises the following steps:

as shown in fig. 1 and 7, step one, constructing a track foundation control network of a track to be constructed:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points 22 which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points 22 comprises two track foundation control points 22 which are symmetrically distributed on the shield wall 1 at the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain the three-dimensional coordinates of each track foundation control point 22;

in this embodiment, the purpose of laying a high-precision track foundation control network can be achieved by measuring and checking the precision of the track foundation control network, so that the precision of measurement lofting of track center line control points and track slab installation sidelines of a plurality of track slabs can be improved, accurate three-dimensional coordinates of the track foundation control points 22 can be provided for fine adjustment of the track slabs, and the assembling precision of the track slabs can be ensured.

As shown in fig. 1 to 5, step two, constructing a track foundation 2 of the slab track bed area to be constructed;

during actual construction, after the track foundation control network of the track to be constructed is constructed, the track foundation 2 needs to be cast in situ on the shield wall 1, the track foundation 2 serves as a foundation structure of the slab track bed structure, and measurement and lofting are required to be carried out on the track foundation 2 subsequently, so that construction of the self-compacting concrete layer and assembly construction of the track slab assembly layer can be carried out.

As shown in fig. 1 and 7, step three, measuring and lofting an urban rail central line control point and a plurality of rail plate mounting side lines of the slab track bed area to be constructed:

301, taking the three-dimensional coordinates of the track foundation control points 22 in the to-be-constructed slab track bed area as a reference, and performing measurement lofting of track central line control points on the surface of the track foundation 2 in the to-be-constructed slab track bed area;

step 302, taking the three-dimensional coordinates of the track foundation control points 22 in the to-be-constructed slab track bed area as a reference, and performing measurement lofting on the track slab installation sidelines of the plurality of track slabs 3 on the surface of the track foundation 2 in the to-be-constructed slab track bed area; the number of the track slab mounting side lines of any one track slab 3 is four, and the four track slab mounting side lines form a track slab assembling area 9 together;

the four track slab mounting sidelines are respectively a track slab left side mounting sideline 8-1, a track slab right side mounting sideline 8-2, a track slab front side mounting sideline 8-3 and a track slab rear side mounting sideline 8-4, the vertical distance between the track slab left side mounting sideline 8-1 and the left side surface of the track slab 3 is recorded as a left side mounting sideline offset distance L1, the vertical distance between the track slab right side mounting sideline 8-2 and the right side surface of the track slab 3 is recorded as a right side mounting sideline offset distance L2, and L2 is equal to L1; the vertical distance between the front side installation sideline 8-3 of the track plate and the front side surface of the track plate 3 is recorded as a front side installation sideline offset distance L3, the vertical distance between the rear side installation sideline 8-4 of the track plate and the rear side surface of the track plate 3 is recorded as a rear side installation sideline offset distance L4, and

in this embodiment, after the track foundation 2 is constructed, the track central line control point of the lofting and the track slab installation sidelines of the plurality of track slabs need to be measured, and the track central line control point and the track slab installation sidelines of the plurality of track slabs are jointly used as the reference lines for subsequently binding the plurality of self-compacting concrete slab reinforcing steel bar meshes 4-2 or assembling the plurality of track slabs 3, because the number of the track slab installation sidelines of any one track slab 3 is four, and the four track slab installation sidelines jointly form the track slab assembling area 7, the installation positions of the plurality of self-compacting concrete slab reinforcing steel bar meshes 4-2 can be ensured, and the assembling accuracy of the track slabs 3 can be determined.

As shown in fig. 1 to 4, step four, laying a plurality of geotextile isolation layers of the to-be-constructed slab track bed area:

a plurality of geotextile isolation layers 5 are respectively laid in a plurality of track slab splicing areas 9 on a track foundation 2, and the geotextile isolation layers 5 adopt polypropylene non-woven geotextiles;

in the embodiment, after the urban rail central line control point of the to-be-constructed slab track bed area and the plurality of rail plate installation side lines are measured and laid, the plurality of geotextile isolation layers 5 are laid in the to-be-constructed slab track bed area, because the rail foundation 2 and the self-compaction concrete plate 4 are both of cast-in-place structures, if the geotextile isolation layers 5 are not adopted for isolation, once the self-compaction concrete plate 4 which is cast has quality problems and needs to be returned, great influence is caused on the rail foundation 2, even the rail foundation 2 needs to be constructed again, therefore, the geotextile isolation layers 5 are laid between the rail foundation 2 and the self-compaction concrete plate 4, the rail foundation 2 and the self-compaction concrete plate 4 are isolated by the geotextile isolation layers 5, the influence on the rail foundation 2 can be effectively avoided, and because the rail foundation 2 is provided with the limit groove 2-1, the self-compacting concrete slab 4 is provided with the limiting bulges 4-1 matched with the limiting grooves 2-1, so that the purpose of tightly combining the track foundation 2 with the self-compacting concrete slab 4 can be realized through the mutual matching between the limiting grooves 2-1 and the limiting bulges 4-1, and the phenomenon of dislocation of the self-compacting concrete slab 4 on the track foundation 2 can be avoided.

As shown in fig. 2 to 6, step five, binding a plurality of self-compacting concrete slab reinforcing meshes of the slab track bed area to be constructed:

respectively binding a plurality of self-compacting concrete layer reinforcing meshes 4-2 in the plurality of track slab assembling areas 9, and adjusting the height of the self-compacting concrete layer reinforcing meshes 4-2 in a mode of arranging a plurality of cushion blocks below the self-compacting concrete layer reinforcing meshes 4-2 so that the self-compacting concrete layer reinforcing meshes 4-2 are positioned in the middle of the self-compacting concrete plates 4;

in the embodiment, the strength and the stability of the self-compacting concrete slab 4 can be improved by arranging the self-compacting concrete slab reinforcing mesh 4-2, and in the track slab assembly layer paved on the slab track bed area to be constructed, a plurality of cushion blocks are arranged below the self-compacting concrete slab reinforcing mesh 4-2, so that the purpose of supporting the self-compacting concrete slab reinforcing mesh 4-2 can be realized by the cushion blocks, the height of the self-compacting concrete slab reinforcing mesh 4-2 can be adjusted, and the self-compacting concrete slab reinforcing mesh 4-2 is positioned in the middle of the self-compacting concrete slab 4;

as shown in fig. 2 to 4, step six, laying a track slab assembly layer of the slab track bed area to be constructed:

the installation method of the plurality of track slabs 3 of the track slab assembly layer is the same, and the installation method of any track slab 3 specifically comprises the following steps:

step 601, preliminary positioning of the track slab:

transporting the track slab 3 to a track slab assembling area 9 by adopting hoisting equipment and transportation equipment, and respectively placing four temporary supports at four corners of a self-compacting concrete layer reinforcing mesh 4-2 in the track slab assembling area 9, wherein the heights of the temporary supports are higher than the heights of the self-compacting concrete layer reinforcing mesh 4-2; then, taking the four mounting edge lines of the track slab, which are measured and lofted in the step 302, as initial positioning reference lines of the track slab 3, and placing the track slab 3 on the four temporary supports;

in this embodiment, four temporary supports are respectively placed at four corners of the self-compacting concrete slab reinforcing mesh 4-2, and since the height of each temporary support is higher than that of the self-compacting concrete slab reinforcing mesh 4-2, when the track slab 3 is placed on four temporary supports, the track slab 3 is jointly supported by the four temporary supports, and the track slab 3 does not contact with the self-compacting concrete slab reinforcing mesh 4-2, so that the self-compacting concrete slab reinforcing mesh 4-2 is prevented from being inclined, and the forming quality of the self-compacting concrete slab 4 is ensured.

Step 602, roughly adjusting the track slab:

installing three-way regulators 21 in the hoisting holes 3-3, roughly adjusting the plane positions of the track slabs 3 by using four track slab installation sidelines measured and lofted in the step 302 as rough adjustment reference lines of the track slabs 3 and using at least two three-way regulators 21 to roughly adjust the plane positions of the track slabs 3, respectively measuring a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4 by using triangular steel plate rulers, and stopping roughly adjusting the track slabs 3 when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation sideline offset distance L4 do not exceed +/-5 mm;

during actual use, the three-way regulator 21 comprises a connecting piece, a vertical displacement regulating piece, a longitudinal displacement regulating piece, a transverse displacement regulating piece and a compacting piece, wherein the vertical displacement regulating piece is in threaded connection with the connecting piece, the transverse displacement regulating piece is placed on the compacting piece, the longitudinal displacement regulating piece is placed on the transverse displacement regulating piece, the bottom end of the vertical displacement regulating piece is vertically connected with the longitudinal displacement regulating piece, a first regulating bolt is transversely and vertically arranged between the transverse displacement regulating piece and the compacting piece, a second regulating bolt is longitudinally and vertically arranged between the longitudinal displacement regulating piece and the transverse displacement regulating piece, when the three-way regulator is actually used, the connecting piece is installed in a hoisting hole 3-4, the compacting piece is placed on the surface of a track foundation 5, and the vertical elevation of the track slab 3 can be regulated by manually screwing the vertical displacement regulating piece; manually screwing the first adjusting bolt, enabling the track plate 3 to be adjusted in longitudinal position along the axial direction of the first adjusting bolt; the second adjusting bolt is screwed manually, the track plate 3 can be adjusted at the transverse position along the axial direction of the second adjusting bolt, and therefore the adjustment in the up-down, front-back and left-right directions of the track plate 3 can be achieved by the aid of the three-way adjuster 21, operation is simple, adjustment is more convenient, and using effect is good.

In this embodiment, the number of the hoisting holes 3-4 on the left side surface of the track slab 3 is two, the number of the hoisting holes 3-4 on the right side surface of the track slab 3 is two, and the two hoisting holes 3-4 on the left side surface of the track slab 3 correspond to the two hoisting holes 3-4 on the right side surface of the track slab 3, and therefore, when the track slab 3 is roughly adjusted, the four track slab installation sidelines measured and lofted in the step 302 are used as rough adjustment reference lines of the track slab 3, and four three-way regulators 21 are adopted for simultaneous adjustment, so that the size deviation of the offset distance L1 of the left installation sideline, the size deviation of the offset distance L2 of the right installation sideline, the size deviation of the offset distance L3 of the front installation sideline and the size deviation of the offset distance L4 of the rear installation sideline can not exceed +/-5 mm, and the assembling precision and the assembling efficiency of the track slab 3 can be improved.

Step 603, fine adjustment of the track slab:

6031, mounting prisms at four corners of the track slab 3, and measuring three-dimensional coordinates of the four prisms by using a total station to obtain three-dimensional measured coordinates of the four corners of the track slab 3 by taking the three-dimensional coordinates of the track foundation control points 22 in the track bed area to be constructed as a reference;

step 6032, comparing the three-dimensional measured coordinates of the four corners of the track slab 3 with the three-dimensional design coordinates of the four corners of the track slab 3 in real time by using a computer, and finely adjusting the elevation position and the plane position of the track slab 3 by using at least two three-way adjusters 21; the sequence of adjusting the elevation position and the plane position of the fine adjustment track slab 3 is as follows: firstly, adjusting the elevation position of the track slab 3 and then adjusting the plane position of the track slab 3 in a diagonal adjustment mode;

when the size deviation between the three-dimensional measured coordinate of any one of the three-dimensional measured coordinates of the four corners of the track slab 3 and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the track slab 3; when the dimensional deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the track slab 3 and the set three-dimensional design coordinates does not exceed +/-1 mm, stopping fine adjustment of the track slab 3, and detaching the four prisms;

in this embodiment, the total station is used to measure the three-dimensional coordinates of the four prisms to obtain the three-dimensional measured coordinates of the four corners of the track slab 3, compared with the prior art, because the accuracy of the track foundation control network is checked in step 102, and the position accuracy of each track foundation control point 22 is improved, therefore, when the elevation position and the plane position of the track slab 3 are finely adjusted, the three-dimensional coordinates of the track foundation control points 22 located in the track bed area to be constructed are used as the reference, the fine adjustment accuracy of the track slab 3 can be greatly improved, and meanwhile, through multiple measurements, when the diagonal adjustment mode is adopted, the elevation position of the track slab 3 is adjusted first, and then the plane position of the track slab 3 is adjusted, the track slab 3 can be finely adjusted in place quickly, and the working efficiency is improved.

Step seven, pouring a plurality of self-compacting concrete slabs of the slab track bed area to be constructed, as shown in fig. 8:

the pouring method of a plurality of self-compacting concrete slabs 4 is the same, and the pouring method of any self-compacting concrete slab 4 comprises the following steps:

701, arranging a self-compacting concrete layer forming formwork assembly around the self-compacting concrete layer reinforcing mesh 4-2, so that a self-compacting concrete pouring cavity is formed between the self-compacting concrete layer forming formwork assembly and the track plate 3;

the self-compacting concrete layer forming formwork assembly consists of two first side formworks 10-1 which are arranged in parallel, two second side formworks 10-2 which are arranged in parallel and four corner formworks 10-3 which are used for connecting the first side formworks 10-1 and the second side formworks 10-2, wherein an exhaust pipe 10-3-1 is arranged on each corner formwork 10-3;

when the self-compacting concrete pouring device is used practically, the exhaust pipes 10-3-1 are arranged on the corner templates 10-3, when the self-compacting concrete is poured, gas in a self-compacting concrete pouring cavity can be exhausted through the four exhaust pipes 10-3-1, the flow of the self-compacting concrete in the self-compacting concrete pouring cavity is facilitated, the phenomenon that four corners in the self-compacting concrete pouring cavity are incompletely poured is avoided, and the forming quality of the self-compacting concrete slab 4 is improved.

Step 702, buckling and fastening the track slab 3 and the self-compacting concrete layer forming formwork assembly by adopting a plurality of buckling and pressing devices;

in this embodiment, because the precision of assembling of track board 3 is directly influenced to the shaping quality of self-compaction concrete slab 4, consequently, through adopting a plurality of withhold devices to track board 3 with self-compaction concrete slab forming module detains to press the fastening, a plurality of withhold devices are the interval along the length direction of track board 3 and lay, can improve the shaping quality of self-compaction concrete slab 4 to guarantee track board 3's the precision of assembling, excellent in use effect.

Step 703, pouring and forming a self-compacting concrete layer:

installing a flow guide pipe 12 in the grouting hole 3-1, pouring self-compacting concrete into the flow guide pipe 12 by using a grouting device, and forming a self-compacting concrete plate 4;

as shown in fig. 2, step eight, installing the steel rails and the fasteners of the plate type track bed area to be constructed:

when the strength of the self-compacting concrete layer reaches more than 70% of the designed strength, the self-compacting concrete layer forming template assembly and the at least two three-way regulators 21 are dismantled, and the self-compacting concrete layer is maintained; and then, installing a steel rail 6 and a fastener 7 on the upper surface of the track slab assembly layer to complete the construction of the slab track bed structure of the to-be-constructed slab track bed area.

As shown in fig. 1 and 5, in the second step of the present embodiment, the specific process of constructing the track foundation 2 of the slab track bed area to be constructed is as follows:

step 201, arranging a plurality of side piles arranged along the length direction of the track foundation 2 on both sides of a shield wall 1, wherein the distance between every two adjacent side piles is 5m, and the height of each side pile is 1.5 m;

step 202, measuring the height of the receiving surface of the track foundation 2 and the central positions of a plurality of limiting grooves 2-1 on the surface of the shield wall 1, and cleaning the surface of the shield wall 1;

step 203, binding the track foundation reinforcement cage 2-2, then erecting a track foundation forming template assembly on the peripheral side of the track foundation reinforcement cage 2-2 to form a track foundation pouring cavity, and finally pouring concrete to form the track foundation 2.

As shown in fig. 8, in this embodiment, in step 702, the fastening device includes a pressing beam 11-1 for pressing against the top surface of the track slab 3 and two pressing vertical rods 11-2 vertically installed at the ends of the pressing beam 11-1, the two pressing vertical rods 11-2 are respectively pressed against the outer side surfaces of the two second side formworks 10-2, and both ends of the pressing beam 11-1 are fixed in the hand holes 1-1 of the shield wall 1 through turnbuckle bolts 11-3.

In the embodiment, the buckling device comprises a pressing beam 11-1 and two pressing vertical rods 11-2, when in actual use, the two pressing vertical rods 11-2 are respectively pressed on the outer side surfaces of the two second side formworks 10-2, when the two ends of the pressing beam 11-1 are fixed in hand holes 1-1 of the shield wall 1 through turn bolts 11-3, the turn bolts 11-3 are screwed to adjust the pressing force of the pressing beam 11-1 acting on the top surface of the track slab 3, and meanwhile, the pressing force of the pressing vertical rods 11-2 acting on the outer side surfaces of the second side formworks 10-2 can be adjusted, so that the operation is convenient, the disassembly and the assembly are convenient, and the use effect is good.

As shown in fig. 8, in this embodiment, in step 703, the grouting device includes a grouting funnel 13 for connecting with the draft tube 12, a chute 15 disposed above the grouting funnel 13, and a hopper mixer for pouring self-compacting concrete into the chute 15, the hopper mixer includes a frame 17, a hopper 18 mounted on the frame 17, and a stirring mechanism mounted in the hopper 18, the stirring mechanism includes a fixed frame 19-1 fixedly mounted at a top end of the hopper 18, a motor 19-2 fixedly mounted on the fixed frame 19-1, and a stirring paddle 19-3 driven by the motor 19-2, the bottom of the grouting funnel 13 is provided with a first support 14 for supporting, and the bottom of the chute 15 is provided with a second support 16 for supporting.

When an urban rail is constructed in a tunnel, when concrete pumping equipment is used for pouring self-compacting concrete, the concrete pumping equipment cannot enter the tunnel, a long-distance pumping pipeline is needed, the phenomena of non-compact pouring, pipe blockage, pipe explosion and the like are easy to occur, so that the pouring of the self-compacting concrete cannot be continuously carried out, and the forming quality of the self-compacting concrete plate 4 is influenced, therefore, in the embodiment, the grouting device comprises a grouting funnel 13, a chute 15 and a hopper mixer, the hopper mixer comprises a frame 17, a hopper 18 and a stirring mechanism, when the self-compacting concrete pouring device is actually used, the grouting funnel 13 is supported on the top surface of the track plate 3 by a first support 14, the chute 15 is supported on the top surface of the track plate 3 by a second support 16, the bottom end of the grouting funnel 13 is connected with a guide pipe 12, the self-compacting concrete is formed by stirring and mixing in the hopper mixer, then the hopper mixer is lifted to the position above the chute 15, and to chute 15 internal inclination self-compaction concrete, self-compaction concrete circulates to the grout funnel 13 in through chute 15, circulates to honeycomb duct 12 in by the grout funnel 13 in to get into the self-compaction concrete pouring intracavity, need not adopt long distance pump sending pipeline, be difficult to appear pouring phenomenons such as incompact, stifled pipe, explosion, and the grout is effectual, convenient to popularize and apply.

In this embodiment, the range of the inclination angle of the chute 15 is 10 ° to 15 °.

In actual use, when the inclination angle of the chute 15 is smaller than 10 degrees, the speed of the self-compacting concrete flowing into the grouting hopper 13 through the chute 15 is slow, and the self-compacting concrete deposition phenomenon is easy to occur in the chute 15; when the inclination of chute 15 was greater than 15, the accumulational phenomenon of self-compaction concrete easily appeared in grout funnel 13, all is not favorable to the grout of self-compaction concrete, influences the shaping quality of self-compaction concrete slab 4.

As shown in fig. 8, in this embodiment, a hoisting ear plate 17-1 for installing a steel cable 20 is disposed on the frame 17.

In this embodiment, in step 703, the temperature of the self-compacting concrete poured into the draft tube 12 ranges from 5 ℃ to 25 ℃, and the height of the draft tube 12 ranges from 0.5m to 1 m.

In this embodiment, the temperature of the self-compacting concrete poured into the draft tube 12 ranges from 5 ℃ to 25 ℃, which is because: when the temperature of the self-compacting concrete is less than 5 ℃, the flowing of the self-compacting concrete is not facilitated, and when the temperature of the self-compacting concrete is more than 25 ℃, the forming of the self-compacting concrete plate 4 is not facilitated.

In this embodiment, when the height of the draft tube 12 is less than 0.5m, the draft tube 12 cannot play a role of guiding the self-compacting concrete, and the draft tube 12 can perform secondary mixing on the self-compacting concrete flowing into the draft tube 12 through the grouting funnel 13, which is beneficial to improving the smoothness of the flow of the self-compacting concrete; when the height of the draft tube 12 is larger than 1m, the draft tube 12 is easily blocked, and the pouring of the self-compacting concrete is interrupted, so that the value range of the height of the draft tube 12 is 0.5 m-1 m.

As shown in fig. 7, in this embodiment, the left side installation sideline offset distance L1 and the right side installation sideline offset distance L2 are both positive integers, and the value range of the left side installation sideline offset distance L1 and the value range of the right side installation sideline offset distance L2 are both 50mm to 100 mm.

During the time of the actual use, when setting for the value of left side installation sideline offset distance L1 with right side installation sideline offset distance L2, the main factor of considering has two: the first consideration is: in order to implement the measurement lofting of the left side installation sideline offset distance L1 and the right side installation sideline offset distance L2 on the track base 2, the distance between the left side surface of the track slab 3 and the left side line of the track base 2 and the distance between the right side surface of the track slab 3 and the right side line of the track base 2, therefore, the left side installation sideline offset distance L1 should be smaller than the distance between the left side surface of the track slab 3 and the left side line of the track base 2, and the right side installation sideline offset distance L2 should be smaller than the distance between the right side surface of the track slab 3 and the right side line of the track base 2; the second consideration is: the convenience of the operator for measuring by adopting a triangular steel plate ruler and the convenience for operating the three-way regulator 21 are realized, so that the value range of the left side installation sideline offset distance L1 and the value range of the right side installation sideline offset distance L2 are both 50-100 mm;

in this embodiment, the distance between the left side of track board 3 and the left side line of track basis 2 and the distance between the right side of track board 3 and the right sideline of track basis 2 are 120mm, and the measuring range of the right-angle side of triangle steel plate ruler is 130mm, therefore, work as left side installation sideline offset distance L1 with right side installation sideline offset distance L2 all is less than when 50mm, or work as left side installation sideline offset distance L1 with right side installation sideline offset distance L2 all is greater than when 100mm, all be inconvenient for operating personnel adopt triangle steel plate ruler to measure and adopt three-way regulator 21 to adjust the elevation position and the plane position of track board 3.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A construction method of an urban rail transit slab type track bed structure comprises a track foundation (2) arranged on a shield wall (1), a self-compacting concrete layer arranged above the track foundation (2), a track slab assembly layer laid on the self-compacting concrete layer and steel rails (6) installed on the track slab assembly layer through fasteners (7), wherein the self-compacting concrete layer comprises a plurality of self-compacting concrete slabs (4) which are sequentially arranged, the track slab assembly layer comprises a plurality of track slabs (3) which are sequentially arranged, the track slabs (3) and the self-compacting concrete slabs (4) are in one-to-one correspondence, grouting holes (3-1), exhaust holes (3-2) and observation holes (3-3) are reserved on the top surface of the track slab (3), hoisting holes (3-4) are arranged on the left side surface of the track slab (3) and the right side surface of the track slab (3), a geotextile isolation layer (5) is arranged between the track foundation (2) and the self-compacting concrete slab (4), a limiting groove (2-1) is arranged on the track foundation (2), a limiting bulge (4-1) matched with the limiting groove (2-1) is arranged on the self-compacting concrete slab (4), and a self-compacting concrete slab reinforcing mesh (4-2) is arranged in the self-compacting concrete slab (4); the method is characterized in that: the construction method comprises the following steps:

step 101, constructing a track foundation control network of a track to be constructed by taking an existing elevation measurement control network and a GPS plane control network as references, wherein the track foundation control network comprises a plurality of pairs of track foundation control points (22) which are distributed at equal intervals along the length direction of the track to be constructed, and each pair of track foundation control points (22) comprises two track foundation control points (22) which are symmetrically distributed on shield walls (1) at the left side and the right side of the track to be constructed;

102, measuring and checking the precision of the track foundation control network to obtain the three-dimensional coordinates of each track foundation control point (22);

step two, constructing a track foundation (2) of the slab track bed area to be constructed;

301, taking the three-dimensional coordinates of a track foundation control point (22) in the to-be-constructed slab track bed area as a reference, and performing measurement lofting of a track center line control point on the surface of the track foundation (2) in the to-be-constructed slab track bed area;

step 302, taking the three-dimensional coordinates of the track foundation control points (22) positioned in the track bed area to be constructed as a reference, and performing measurement lofting on the track slab installation side lines of a plurality of track slabs (3) on the surface of the track foundation (2) of the track bed area to be constructed; the number of the track slab mounting side lines of any one track slab (3) is four, and the four track slab mounting side lines form a track slab splicing area (9) together;

the four track plate mounting sidelines are respectively a track plate left side mounting sideline (8-1), a track plate right side mounting sideline (8-2), a track plate front side mounting sideline (8-3) and a track plate rear side mounting sideline (8-4), the vertical distance between the track plate left side mounting sideline (8-1) and the left side surface of the track plate (3) is recorded as a left side mounting sideline offset distance L1, the vertical distance between the track plate right side mounting sideline (8-2) and the right side surface of the track plate (3) is recorded as a right side mounting sideline offset distance L2, and L2 is equal to L1; the vertical distance between the track plate front side installation sideline (8-3) and the front side surface of the track plate (3) is recorded as a front side installation sideline offset distance L3, the vertical distance between the track plate rear side installation sideline (8-4) and the rear side surface of the track plate (3) is recorded as a rear side installation sideline offset distance L4, and

a plurality of geotextile isolation layers (5) are respectively paved in a plurality of track slab splicing areas (9) on a track foundation (2), and the geotextile isolation layers (5) adopt polypropylene non-woven geotextiles;

a plurality of self-compacting concrete layer reinforcing meshes (4-2) are respectively bound in the plurality of track slab splicing areas (9), and the height of the self-compacting concrete plate reinforcing meshes (4-2) is adjusted by adopting a mode of arranging a plurality of cushion blocks under the self-compacting concrete plate reinforcing meshes (4-2), so that the self-compacting concrete plate reinforcing meshes (4-2) are positioned in the middle of the self-compacting concrete plate (4);

the installation method of the plurality of track slab track slabs (3) of the track slab assembly layer is the same, and the installation method of any track slab (3) specifically comprises the following steps:

step 601, preliminary positioning of the track slab:

transporting the track slab (3) to a track slab assembling area (9) by adopting hoisting equipment and transportation equipment, and respectively placing four temporary supports at four corners of a self-compacting concrete layer reinforcing mesh (4-2) in the track slab assembling area (9), wherein the heights of the temporary supports are higher than that of the self-compacting concrete layer reinforcing mesh (4-2); then, taking the four mounting edge lines of the track slab for lofting measurement in the step 302 as initial positioning reference lines of the track slab (3), and placing the track slab (3) on the four temporary supports;

step 602, roughly adjusting the track slab:

installing three-way regulators (21) in the hoisting holes (3-3), roughly adjusting the plane positions of the track plates (3) by using the four track plate installation sidelines which are measured and lofted in the step 302 as rough adjustment reference lines of the track plates (3) and utilizing at least two three-way regulators (21), respectively measuring a left side installation sideline offset distance L1, a right side installation sideline offset distance L2, a front side installation sideline offset distance L3 and a rear side installation sideline offset distance L4 by using steel plate rulers, and stopping roughly adjusting the track plates (3) when the size deviation of the left side installation sideline offset distance L1, the size deviation of the right side installation sideline offset distance L2, the size deviation of the front side installation sideline offset distance L3 and the size deviation of the rear side installation sideline offset distance L4 are not more than +/-5 mm;

step 603, fine adjustment of the track slab:

6031, mounting prisms at four corners of the track slab (3), and measuring three-dimensional coordinates of the four prisms by using a total station instrument with the three-dimensional coordinates of a track basic control point (22) positioned in a track bed area of the slab to be constructed as a reference to obtain three-dimensional measured coordinates of the four corners of the track slab (3);

6032, comparing the three-dimensional measured coordinates of the four corners of the track plate (3) with the three-dimensional design coordinates of the four corners of the track plate (3) in real time by using a computer, and finely adjusting the elevation position and the plane position of the track plate (3) by using at least two three-way adjusters (21); the adjustment sequence of the elevation position and the plane position of the fine adjustment track slab (3) is as follows: firstly, adjusting the elevation position of the track slab (3) and then adjusting the plane position of the track slab (3) in a diagonal adjustment mode;

when the size deviation between the three-dimensional measured coordinate of any one of the four three-dimensional measured coordinates of the track slab (3) and the set three-dimensional design coordinate exceeds +/-1 mm, continuing to finely adjust the track slab (3); when the size deviation between the three-dimensional measured coordinates of the four corners in the three-dimensional measured coordinates of the four corners of the track slab (3) and the set three-dimensional design coordinates does not exceed +/-1 mm, stopping fine adjustment of the track slab (3), and detaching the four prisms;

the pouring method of a plurality of self-compacting concrete slabs (4) is the same, and the pouring method of any self-compacting concrete slab (4) comprises the following steps:

701, arranging a self-compacting concrete layer forming formwork assembly around the self-compacting concrete layer reinforcing mesh (4-2) to form a self-compacting concrete pouring cavity between the self-compacting concrete layer forming formwork assembly and the track plate (3);

the self-compacting concrete layer forming formwork assembly consists of two first side formworks (10-1) which are arranged in parallel, two second side formworks (10-2) which are arranged in parallel and four corner formworks (10-3) which are used for connecting the first side formworks (10-1) and the second side formworks (10-2), wherein exhaust pipes (10-3-1) are arranged on the corner formworks (10-3);

702, buckling and fastening a track plate (3) and the self-compacting concrete layer forming formwork assembly by adopting a plurality of buckling and pressing devices;

step 703, pouring and forming a self-compacting concrete layer:

installing a flow guide pipe (12) in the grouting hole (3-1), and pouring self-compacting concrete into the flow guide pipe (12) by using a grouting device to form a self-compacting concrete plate (4);

when the strength of the self-compacting concrete layer reaches more than 70% of the designed strength, the self-compacting concrete layer forming template assembly and the at least two three-way regulators (21) are dismantled, and the self-compacting concrete layer is maintained; and then, installing a steel rail (6) and a fastener (7) on the upper surface of the track slab assembly layer to complete the construction of the slab track bed structure of the to-be-constructed slab track bed area.

2. The construction method of the urban rail transit slab track bed structure according to claim 1, characterized in that: in the second step, the concrete process of constructing the track foundation (2) of the plate type track bed area to be constructed is as follows:

step 201, arranging a plurality of side piles arranged along the length direction of the track foundation (2) on two sides of a shield wall (1), wherein the distance between every two adjacent side piles is 5m, and the height of each side pile is 1.5 m;

step 202, measuring the height of the receiving surface of the track foundation (2) and the central positions of a plurality of limiting grooves (2-1) on the surface of the shield wall (1), and cleaning the surface of the shield wall (1);

step 203, binding a track foundation reinforcement cage (2-2), then erecting a track foundation forming template assembly on the peripheral side of the track foundation reinforcement cage (2-2) to form a track foundation pouring cavity, and finally pouring concrete to form the track foundation (2).

3. The construction method of the urban rail transit slab track bed structure according to claim 1, characterized in that: in step 702, the buckling device comprises a pressing beam (11-1) used for being pressed on the top surface of the track slab (3) and two pressing vertical rods (11-2) vertically installed at the end parts of the pressing beam (11-1), the two pressing vertical rods (11-2) are respectively pressed on the outer side surfaces of the two second side templates (10-2), and the two ends of the pressing beam (11-1) are fixed in hand holes (1-1) of the shield wall (1) through turn-key bolts (11-3).

4. The construction method of the urban rail transit slab track bed structure according to claim 1, characterized in that: in step 703, the grouting device comprises a grouting funnel (13) connected with the draft tube (12), a chute (15) arranged above the grouting funnel (13), and a hopper mixer for pouring self-compacting concrete into the chute (15), the hopper mixer comprises a frame (17), a hopper (18) arranged on the frame (17) and a stirring mechanism arranged in the hopper (18), the stirring mechanism comprises a fixed frame (19-1) fixedly arranged at the top end of the hopper (18), a motor (19-2) fixedly arranged on the fixed frame (19-1) and a stirring paddle (19-3) driven by the motor (19-2), a first bracket (14) for supporting is arranged at the bottom of the grouting funnel (13), the bottom of the chute (15) is provided with a second bracket (16) for supporting.

5. The construction method of the urban rail transit slab track bed structure according to claim 4, characterized in that: in step 703, the temperature of the self-compacting concrete poured into the draft tube (12) ranges from 5 ℃ to 25 ℃, and the height of the draft tube (12) ranges from 0.5m to 1 m.

6. The construction method of the urban rail transit slab track bed structure according to claim 1, characterized in that: the offset distance L1 of the left side installation sideline and the offset distance L2 of the right side installation sideline are positive integers, and the value range of the offset distance L1 of the left side installation sideline and the value range of the offset distance L2 of the right side installation sideline are both 50-100 mm.