CN114481716A

CN114481716A - Subway bed and construction method thereof

Info

Publication number: CN114481716A
Application number: CN202210108545.9A
Authority: CN
Inventors: 杨帅; 肖先; 安静; 朱启光; 雷兴杰; 祝传旭
Original assignee: Fourth Engineering Co Ltd of China Railway 20th Bureau Group Co Ltd
Current assignee: Fourth Engineering Co Ltd of China Railway 20th Bureau Group Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-05-13

Abstract

The invention relates to a subway bed and a construction method thereof, the key points of the technical scheme are that the subway bed comprises a bed base and a floating slab arranged on the bed base, the upper part of the floating slab is provided with a sleeper used for installing and positioning a track, a spring shock absorber is arranged between the bed base and the floating slab, the bed base comprises a base layer and an elastic shock absorption layer arranged on the upper part of the base layer, and the elastic shock absorption layer comprises an elastic support net and a bearing layer arranged on the upper part of the elastic support net; the interior of the elastic support net is filled with crushed stones; a mounting substrate is laid on the upper part of the elastic vibration damping layer, and the lower end of the spring vibration damper is fixedly connected with the mounting substrate; the invention can well buffer and absorb shock generated in the running process of the subway.

Description

Subway bed and construction method thereof

Technical Field

The invention relates to the technical field of subway beds, in particular to a subway bed and a construction method thereof.

Background

The ballast bed is an important component of the track and is the foundation of the track frame. The ballast bed is laid on a roadbed, a bridge or a tunnel and other infrastructure, and broken stones, pebble layers or concrete layers below the steel rails, sleepers or supporting blocks are used as the foundation of the steel rails or the track frame. The track bed is divided into a common ballast track bed, an asphalt track bed and a concrete integral track bed. Ballast beds are usually built up from hard crushed stones of a certain particle size, grading and strength, and graded pebbles or grit may also be used on secondary lines. The asphalt track bed is a structural form added with emulsified asphalt or asphalt mortar for improving the dispersion characteristics of the common stone ballast track bed. The whole ballast bed is usually of a cast-in-place reinforced concrete structure and is usually used in a tunnel or on a bridge which is not easy to deform.

With the development of urban traffic, subway rail transit is more and more widely applied to urban traffic. Subway lines often pass through areas with dense personnel, such as residential areas and business areas, and the subways can generate large vibration and noise during operation, so that vibration and noise reduction are very important technical tasks in the construction of subway facilities. The better subway railway roadbed of damping effect adopts spring floating plate structure usually at present, and the railway roadbed includes the bed base and sets up the floating plate on the bed base promptly, is provided with spring damper between bed base and the floating plate. The sleeper is installed on the upper part of the floating slab. Vibration generated in the operation process of the subway is buffered and damped through the elastic shock absorber. However, as the floating slab and the bed foundation are rigid structures, and the elastic shock absorber needs to provide a large supporting force for the floating slab, the vibration generated in the running process of the subway can be still transmitted to the foundation, and then transmitted to the surrounding environment through the foundation.

Disclosure of Invention

One of the purposes of the invention is to provide a subway track bed which can well buffer and absorb shock generated in the process of subway running.

The technical purpose of the invention is realized by the following technical scheme: a subway track bed comprises a bed base and a floating slab arranged on the bed base, wherein a sleeper used for installing and positioning a track is arranged on the upper portion of the floating slab, a spring shock absorber is arranged between the bed base and the floating slab, the bed base comprises a concrete base layer and an elastic shock absorption layer arranged on the upper portion of the concrete base layer, and the elastic shock absorption layer comprises an elastic supporting net and a bearing layer arranged on the upper portion of the elastic supporting net; the elastic supporting net is internally filled with broken stones; and a mounting substrate is laid on the upper part of the elastic vibration damping layer, and the lower end of the spring vibration damper is fixedly connected with the mounting substrate.

Through above-mentioned technical scheme, through set up the elastic damping layer on concrete foundation layer upper portion, and then when the vibration is conducted to the bed base, elastic deformation through the elastic support net, can be good eliminate conduction vibration, and through filling the rubble piece in the elastic support net inside, not only make the elastic support layer have good holding power, there is the clearance between the rubble piece in addition, when the elastic damping layer received the impact force from upper portion, produce relative motion between the rubble piece, thereby can disperse the consumption to the impact force that receives.

Preferably, the bearing layer comprises a buffer base layer and an epoxy resin layer arranged on the upper part of the buffer base layer.

Through above-mentioned technical scheme, the carrier layer includes buffer base layer and epoxy layer, and the epoxy layer has good cushioning characteristic to with have good adhesion characteristic, can use as the adhesive of mounting substrate, make mounting substrate and the inseparable combination of elastic damping layer.

Preferably, the buffer base layer comprises buffer particles and cement mortar filled around the buffer particles; the buffer particles comprise stones and EPS adhesive layers wrapping the surfaces of the stones.

Through above-mentioned technical scheme, the inside buffering granule that is provided with of buffering basic unit, the buffering granule regards as the aggregate with the stone, and outside parcel EPS adhesion layer, and then the buffering basic unit that uses the preparation of adulteration buffering granule to form has good support intensity and buffering characteristic.

Preferably, a connecting groove is formed in the middle of the lower portion of the floating plate, and a connecting protrusion matched with the connecting groove is arranged on the upper portion of the mounting substrate.

Through above-mentioned technical scheme, set up the constant head tank through the lower part at floating the board, set up on mounting substrate's upper portion and connect the arch, and then through the cooperation of connecting protruding and constant head tank, further carry out horizontal spacing to floating the board.

Preferably, the cross-sectional shape of the coupling projection is a trapezoid gradually increasing from top to bottom.

According to the technical scheme, the cross section of the connecting bulge is in a trapezoid shape gradually increasing from top to bottom, so that the floating plate is convenient to mount and position; and the cross section of the connecting bulge is trapezoidal, so that the connecting bulge has better structural strength.

Preferably, the upper part of the mounting substrate is provided with a vertical connecting guide post, and the lower part of the floating plate is provided with a connecting hole for being inserted with the connecting guide post; the lower end of the connecting guide post is elastically connected with the mounting substrate.

Through the technical scheme, the floating plate is installed and positioned through the matching of the connecting guide pillar and the connecting hole, so that the floating plate can be installed and positioned more conveniently and quickly; and the lower end of the connecting guide post is elastically connected with the mounting substrate, so that the mounting substrate can be buffered and damped when the floating plate generates transverse vibration through the matching of the connecting guide post and the connecting hole.

Preferably, the upper part of the floating plate is provided with a positioning groove for placing and positioning the sleeper; damping plates are respectively arranged on two sides of the positioning groove; one side of shock attenuation board is fixed with a plurality of reference column along its length direction, the locating hole that is used for with the reference column grafting is seted up to the lateral wall of constant head tank, be provided with the damping spring who cup joints with the reference column in the locating hole, damping spring's both ends respectively with the hole bottom butt of shock attenuation board and locating hole.

Through above-mentioned technical scheme, the mounted position department through the sleeper sets up the constant head tank to set up the shock attenuation board in the both sides of constant head tank, set up damping spring between the cell wall of shock attenuation board constant head tank, and then when the subway went through, damping spring can absorb the vibration of sleeper transmission, reduces the sleeper lateral vibration transmission.

Another object of the present invention is to provide a method for constructing a subway bed, which can well absorb and damp the vibration generated during the running of the subway.

The technical purpose of the invention is realized by the following technical scheme: a subway bed construction method is applied to the construction of the subway bed, and comprises the following steps:

step S1, leveling the ground paved by the bed base, and paving a concrete base layer made of concrete on the ground;

step S2, after step S1 is completed, fixing the lower part of the elastic support net on the buffer layer, and then filling the gaps of the elastic support net with crushed stones;

step S3, after step S2 is completed, stones and EPS particles are uniformly mixed, and a proper amount of water, a thickening agent and an emulsifying agent are added, so that the stones are uniformly wrapped by the EPS material, an EPS adhesive layer is formed on the surfaces of the stones, and then buffer particles are prepared; after the EPS adhesive layer is solidified on the surface of the stone, uniformly mixing the buffering particles with cement mortar, and then paving the mixture on a bed base to form a buffering base layer;

step S4, after step S3, painting an epoxy resin layer on the surface of the buffer base layer, and laying a mounting substrate on the upper part of the epoxy resin layer;

in step S5, after step S4 is completed, the lower end of the spring damper is fixedly connected to the mounting substrate, and the floating plate is fixedly mounted on the upper portion of the spring damper.

Through above-mentioned technical scheme, the buffering granule is prepared through EPS granular material and stone in the buffering basic unit adoption of this scheme, the buffering granule uses the stone as the aggregate, outside parcel EPS adhesion layer, and then the buffering basic unit that forms of using doping buffering granule preparation has good support strength and buffering characteristic, and apply paint epoxy layer on the surface of buffering basic unit, use epoxy layer as buffer medium and bonding medium, thereby make the inseparable laminating of mounting substrate on buffering basic unit, and the vibration to the mounting substrate transmission that can be good cushions the damping.

Preferably, in step S3, the EPS adhesion layer has a thickness of 15 to 20 mm.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural view of a subway track bed.

Fig. 2 is a partially enlarged view of a in fig. 1.

Fig. 3 is a schematic structural view of the elastic support net.

Fig. 4 is a schematic structural view showing an internal construction of a buffering base layer.

Fig. 5 is a sectional view of the spring damper.

Fig. 6 is a schematic view showing a damper plate mounting structure.

Wherein, 1, floating plate; 11. connecting grooves; 12. positioning a groove; 13. positioning holes; 14. connecting holes; 2. a sleeper; 3. a concrete base layer; 4. an elastic vibration damping layer; 41. an elastic support net; 42. a buffer base layer; 421. buffering the particles; 4211. stones; 4212. an EPS adhesion layer; 422. cement mortar; 43. an epoxy resin layer; 5. a mounting substrate; 51. a connecting projection; 6. a spring damper; 61. an upper housing; 62. a lower housing; 63. a guide post; 64. a support spring; 7. connecting the guide post; 71. a buffer spring; 8. a damper plate; 9. a positioning column; 10. a shock absorbing spring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Example 1:

a subway track bed, refer to fig. 1, including the bed base and set up floating slab 1 on the bed base, the upper portion of floating slab 1 is provided with the sleeper 2 that is used for carrying out the installation location to the track. The bed base comprises a concrete base layer 3 and an elastic vibration damping layer 4 arranged on the upper portion of the concrete base layer 3, and a mounting base plate 5 is laid on the upper portion of the elastic vibration damping layer 4. The mounting base plate 5 is a concrete precast slab, which is fixed on the elastic damping layer 4 and serves as a mounting base for the floating slab 1. A spring damper 6 is arranged between the bed base and the floating plate 1. The lower end of the spring damper 6 is fixedly connected with the mounting substrate 5, and the upper end of the spring damper 6 is fixedly connected with the floating plate 1.

Referring to fig. 1, a coupling groove 11 is opened at a lower middle position of the floating plate 1, and a coupling protrusion 51 engaged with the coupling groove 11 is provided at an upper portion of the mounting substrate 5. The sectional shape of the coupling projection 51 is a trapezoid gradually increasing from top to bottom. The lower surface of the floating slab 1 is provided with an asphalt layer. The floating plate 1 is further laterally restrained by the engagement of the coupling projection 51 with the coupling groove 11. And the asphalt layer has good buffer property, so that rigid collision between the floating plate 1 and the mounting substrate 5 can be avoided.

Referring to fig. 1 and 2, a vertical connection guide post 7 is disposed on an upper portion of the mounting substrate 5, and a connection hole 14 for inserting the connection guide post 7 is formed on a lower portion of the floating plate 1. A buffer spring 71 is provided at the lower end of the connection guide post 7, and both ends of the buffer spring 71 are fixedly connected to the connection guide post 7 and the mounting board 5, respectively. The floating plate 1 is installed and positioned through the matching of the connecting guide post 7 and the connecting hole 14, so that the floating plate 1 can be installed and positioned more conveniently and quickly; the lower end of the connecting guide post 7 is elastically connected to the mounting substrate 5, so that the mounting substrate 5 can be cushioned by the engagement of the connecting guide post 7 with the connecting hole 14 when the floating plate 1 vibrates in the lateral direction.

Referring to fig. 1 and 3, the elastic damping layer 4 includes an elastic support net 41 and a bearing layer disposed on the upper portion of the elastic support net 41. The elastic supporting net 41 is made of 65Mn material and is in a three-dimensional grid shape formed by interweaving mutually perpendicular transverse spring wires, longitudinal spring wires and vertical spring wires. The elastic supporting net 41 is made of EPS materials coated on the surface. The inside of the elastic support net 41 is filled with crushed stone. The particle size of the crushed stone is usually 10 mm to 30 mm. The carrier layer includes a buffer base layer 42 and an epoxy resin layer 43 disposed on the upper portion of the buffer base layer 42. The buffer base layer 42 is a composite made by mixing stones, concrete and EPS particles, and has good support property and buffering property. The epoxy resin has not only good vibration damping and cushioning characteristics but also good vibration damping properties against vibrations transmitted from the mounting board 5.

Through set up elastic damping layer 4 between mounting substrate 5 and concrete foundation 3, and then when the vibration is conducted to the bed base, through elastic deformation of elastic support net 41, can be good eliminate conduction vibration, and through at the inside broken stone piece that fills of elastic support net 41, not only make elastic damping layer 4 have good holding power, there is the clearance between the broken stone piece 42 in addition, when elastic damping layer 4 received the impact force from upper portion, produce relative motion between the broken stone piece 42, thereby can disperse the consumption to the impact force that receives.

Referring to fig. 4, the buffer base layer 42 includes buffer particles 421 and cement mortar 422 filled around the buffer particles 421; the buffer particles 421 comprise stones 4211 and an EPS adhesion layer 4212 wrapping the surfaces of the stones 4211. The buffer base layer 42 is internally provided with the buffer particles 421, the buffer particles 421 take stones 4211 as aggregates, and the EPS adhesive layer 4212 is coated outside the buffer particles 421, so that the buffer base layer 42 manufactured by using the doped buffer particles 421 has good support strength and buffer characteristics.

Referring to fig. 5, the spring damper 6 includes an upper case 61, a lower case 62, and a support spring 64 disposed inside the lower case 62. The upper case 61 and the lower case 62 are inserted to allow relative movement between the upper case 61 and the lower case 62. The inside of lower casing 62 is provided with guide post 63, and supporting spring 64 cup joints on guide post 63, and the both ends of supporting spring 64 respectively with last casing 61 and lower casing 62 butt. The upper part of the upper case 61 is fixedly connected to the floating plate 1, and the lower part of the lower case 62 is fixedly connected to the mounting board 5. The spring damper 6 performs shock absorption by compressing the support spring 64 when receiving a shock from above.

Referring to fig. 6, the upper portion of the floating plate 1 is provided with a positioning groove 12 for placing and positioning the sleeper 2; the two sides of the positioning groove 12 are respectively provided with a damping plate 8. One side of shock attenuation board 8 is fixed with a plurality of reference column 9 along its length direction, and locating hole 13 that is used for with reference column 9 grafting is offered to the lateral wall of constant head tank 12, is provided with the damping spring 10 that cup joints with reference column 9 in the locating hole 13, and the both ends of damping spring 10 respectively with the hole bottom butt of shock attenuation board 8 and locating hole 13. The damping plate 8 is made of nylon and has good damping characteristic. When the subway passes, because the side of sleeper 2 is not direct with constant head tank 12 contact, the vibration that sleeper 2 produced conducts through the shock attenuation board 8 that the nylon plate preparation formed, absorbs the vibration of sleeper 2 transmission through damping spring 10, reduces sleeper 2 lateral vibration transmission.

Example 2:

a subway bed construction method applied to the subway bed described in embodiment 1, comprising the steps of:

and step S1, leveling the ground paved by the bed base, and paving the bed base made of concrete on the ground.

Step S2, when the concrete base layer 3 is not completely solidified, inserting the lower part of the elastic supporting net 41 into the concrete base layer 3 until the concrete base layer 3 is completely solidified, and fixedly connecting the lower part of the elastic supporting net 41 with the concrete base layer 3; the height of the elastic support net 41 is usually between 10 cm and 15 cm, the gap of the elastic support net 41 is filled with the crushed stone 42, the filling height of the crushed stone is about 1 cm lower than the upper part of the elastic support net 41, and the elastic support net 41 keeps a good initial shape.

Step S3, after step S2 is completed, stones and EPS particles are uniformly mixed, and a proper amount of water, a thickening agent, an emulsifier, a thickening agent and an emulsifier are added, so that the EPS material uniformly wraps the stones, an EPS adhesive layer is formed on the surfaces of the stones, and then buffer particles are prepared; the thickness of the EPS attachment layer is usually set to 15 mm to 20 mm. Wherein, the thickening agent is polyvinyl alcohol, and the emulsifying agent is emulsifier polyoxypropylene ether. After the EPS adhesion layer is cured on the surface of the stone, the buffer particles and cement mortar are uniformly mixed and then laid on the bed base to form the buffer base layer 43.

In step S4, after step S3 is completed, the epoxy resin layer 44 is painted on the surface of the cushion base layer 43, and the mounting substrate 5 is mounted on the epoxy resin layer 44.

In step S5, the lower end of the spring damper 6 is fixedly connected to the mounting board 5, and the floating plate 1 is fixedly mounted on the upper portion of the spring damper 6.

In the scheme, the buffer base layer 43 adopts EPS granular materials and stones to prepare buffer particles, the buffer particles take the stones as aggregates, and an EPS adhesive layer is coated outside the buffer particles. The buffer base layer 43 made of concrete doped with buffer particles has good supporting strength and buffering property. By coating the epoxy resin layer 44 on the surface of the cushion base layer 43 and using the epoxy resin layer 44 as a cushion medium and an adhesive medium, the mounting substrate 5 is closely attached to the cushion base layer 43, and vibration transmitted from the mounting substrate 5 can be favorably damped.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The utility model provides a subway ballast bed, includes the bed base and sets up floating plate (1) on the bed base, the upper portion of floating plate (1) is provided with sleeper (2) that are used for carrying out the installation location to the track, be provided with spring damper (6), its characterized in that between bed base and floating plate (1): the bed base comprises a concrete base layer (3) and an elastic vibration damping layer (4) arranged on the upper portion of the concrete base layer (3), wherein the elastic vibration damping layer (4) comprises an elastic supporting net (41) and a bearing layer arranged on the upper portion of the elastic supporting net (41); the elastic supporting net (41) is filled with crushed stones; and a mounting substrate (5) is laid on the upper part of the elastic vibration damping layer (4), and the lower end of the spring vibration damper (6) is fixedly connected with the mounting substrate (5).

2. A subway track bed as claimed in claim 1, wherein: the bearing layer comprises a buffer base layer (42) and an epoxy resin layer (43) arranged on the upper part of the buffer base layer (42).

3. A subway ballast bed as claimed in claim 2, wherein: the buffer base layer (42) comprises buffer particles (421) and cement mortar (422) filled around the buffer particles (421); the buffer particles (421) comprise stones (4211) and EPS adhesive layers (4212) wrapping the surfaces of the stones (4211).

4. A subway track bed as claimed in claim 1, wherein: the floating plate is characterized in that a connecting groove (11) is formed in the middle of the lower portion of the floating plate (1), and a connecting protrusion (51) matched with the connecting groove (11) is arranged on the upper portion of the mounting base plate (5).

5. A subway track bed as claimed in claim 2, wherein: the cross-sectional shape of the coupling projection (51) is a trapezoid that gradually increases from top to bottom.

6. A subway track bed as claimed in claim 1, wherein: and an asphalt layer is arranged on the lower surface of the floating slab (1).

7. A subway track bed as claimed in claim 1, wherein: the upper part of the mounting substrate (5) is provided with a vertical connecting guide post (7), and the lower part of the floating plate (1) is provided with a connecting hole (14) for being inserted with the connecting guide post (7); the lower end of the connecting guide post (7) is elastically connected with the mounting substrate (5).

8. A subway track bed as claimed in claim 1, wherein: the upper part of the floating plate (1) is provided with a positioning groove (12) for placing and positioning the sleeper (2); shock absorption plates (8) are respectively arranged on two sides of the positioning groove (12); one side of shock attenuation board (8) is fixed with a plurality of reference column (9) along its length direction, locating hole (13) that are used for pegging graft with reference column (9) are seted up to the lateral wall of constant head tank (12), be provided with damping spring (10) that cup joint with reference column (9) in locating hole (13), damping spring's (10) both ends respectively with the hole bottom butt of shock attenuation board (8) and locating hole (13).

9. A subway bed construction method applied to the construction of the subway bed as claimed in any one of claims 1 to 8, comprising the steps of:

step S1, leveling the ground paved by the bed base, and paving a concrete base layer (3) made of concrete on the ground;

step S2, after step S1 is completed, the lower part of the elastic supporting net (41) is fixed on the buffer layer, and then the gap of the elastic supporting net (41) is filled with the broken stone block (42);

step S3, after step S2 is completed, stones and EPS particles are uniformly mixed, and a proper amount of water, a thickening agent and an emulsifying agent are added, so that the stones are uniformly wrapped by the EPS material, an EPS adhesive layer is formed on the surfaces of the stones, and then buffer particles are prepared; after the EPS adhesive layer is solidified on the surface of the stone, uniformly mixing the buffering particles with cement mortar, and then paving the mixture on a bed base to form a buffering base layer (43);

in step S4, after step S3 is completed, the surface of the cushion base layer (43) is painted with an epoxy resin layer (44), and the mounting substrate (5) is laid on the epoxy resin layer (44).

And step S5, after step S4 is completed, the lower end of the spring damper (6) is fixedly connected with the mounting substrate (5), and the floating plate (1) is fixedly mounted on the upper part of the spring damper (6).

10. A subway bed construction method as claimed in claim 9, wherein: in step S3, the EPS adhesion layer has a thickness of 15 to 20 mm.