CN205242181U - Novel board -like ballastless track structure - Google Patents

Abstract

The utility model relates to a novel prefabricated slab-type ballastless track structure for high-speed railways and urban rail transits. A new type of prefabricated slab ballastless track structure, which includes steel rails, fasteners, prefabricated track slabs, under-slab filling adjustment layers, bases, and limiting bosses. The track slab is in the form of a hollow frame in the middle (through holes), A boss (5) is set on the base (4) corresponding to the through hole in the middle of the prefabricated track plate, and the limiting boss (5) is single or multiple, and the utility model can reduce the tensile stress of the adjustment layer , the track plate bears greater tensile stress, which can give full play to the high-strength and high-rigidity function of the track plate; setting through holes on the track plate reduces the manufacturing cost, and also reduces the longitudinal temperature force on the track plate, greatly reducing the unit plate track structure plate Corner warping; the limit boss is in the middle of the track plate, which is convenient for the replacement of track plates and other components, as well as maintenance and rectification such as lifting and rectification when the track is unevenly settled.

Description

A New Slab Ballastless Track Structure

technical field

The utility model relates to the field of ballastless track laying, in particular to a novel plate type ballastless track.

Background technique

At present, the types of ballastless track in my country mainly include CRTSⅠtype double block type, CRTSⅠtype slab type, CRTSⅡtype slab type and CRTSⅢtype slab type, which have different advantages and disadvantages in terms of project cost, construction efficiency and maintainability.

The CRTS I type double-block ballastless track has high integrity, and the design and manufacturing technology of the sleeper can be used, and the cost is relatively low, but the cast-in-place track bed slab and the joint surface between the prefabricated sleeper and the old and new concrete of the track bed slab are prone to cracks; The track bed slab is cast-in-place concrete, the surface drainage slope is difficult to construct, the construction quality control is relatively difficult, and the construction efficiency is relatively poor. At the same time, when the track structure is destructively damaged, the maintainability is relatively poor.

The CRTS Ⅰ slab ballastless track has good construction performance and repairability, and the convex abutment at the beam end bears the largest force, but the convex abutment at the beam end is semicircular, and its anti-deformation ability and adaptability to long-span bridges are relatively low. Poor; the performance stability and durability of cement emulsified asphalt mortar in the filling layer are greatly affected by raw materials, construction technology and climatic conditions, and the amount of emulsified asphalt is large, resulting in a relatively high material cost for the filling layer.

CRTSⅡ type slab ballastless track has good structural integrity and longitudinal continuity, and good track smoothness, but its construction operation is cumbersome, and the maintainability of the longitudinal connection structure of the track slab is relatively poor. The integrity of the track slab is adversely affected, and the adaptability to later engineering adjustments is poor. The finishing of the track slab is expensive and the construction cost is the highest.

The CRTSⅢ slab ballastless track adopts self-compacting concrete instead of cement emulsified asphalt mortar. In order to prevent the concrete in the adjustment layer from cracking, steel mesh is laid, and door-shaped bars are pre-embedded under the track slab, so that the track slab and the self-compacting concrete adjustment layer are connected into one Overall, the structure has good durability, but the self-compacting concrete of the filling layer is mixed centrally and transported to the site by tanker for pouring, which leads to a large waste ratio and high cost. In the event of destructive damage, repairability is poor.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a novel slab ballastless track.

A new type of slab ballastless track, including rails, fasteners, prefabricated track slabs, filling adjustment layers under the slab, base, and limit bosses, wherein: the new slab ballastless track includes at least one prefabricated track slab and an adjustment layer And be arranged on a corresponding base. The prefabricated track plate is arranged on the adjustment layer and at least one through hole is formed in the middle, the limiting boss has a shape corresponding to the shape of the through hole, and the steel rail is set on the prefabricated track plate . The track plate is in the form of a hollow (through hole) frame in the middle.

The base is provided with a limiting boss whose position corresponds to the hollow part (through hole) in the middle of the prefabricated track plate, and the outer diameter of the limiting boss is smaller than the through hole of the track plate. The limit boss is single or multiple, and the corresponding track plate through hole is single or multiple. When it is a single through hole, the side length of the through hole along the track direction (longitudinal) is longer than its transverse side length; When there is an intermediate hollow frame, the frame can be square, circular, and a shape made up of straight lines and arcs.

A damping layer (6) is arranged between the through hole of the prefabricated track plate and the limiting boss, and the damping layer (6) can be pre-installed on the inside of the through hole of the track plate or poured on site later; the damping layer (6) is formed by elastic Material composition; the elastic material is a prefabricated rubber elastic pad or cast-in-place two-component polyurethane. When the prefabricated rubber elastic backing plate is used, the inner elevation of the through hole of the track plate and the outer elevation of the boss have a convex or concave distribution structure, and the concave or convex distribution structure on both sides of the rubber elastic backing plate is consistent with it. The rubber backing plate is close to the inside elevation of the through hole of the track slab, and the gap between it and the boss is filled and fixed with non-shrinkage and anti-cracking cement mortar or concrete pouring; Paste the perfusion bag in the gap, and finally pour and fill the stirred polyurethane.

The filling adjustment layer (3) can be selected from materials such as self-compacting concrete, self-leveling mortar, polymer emulsion-cement composite mortar or concrete. The preferred adjustment layer is emulsified asphalt-cement composite mortar, and the construction method can be adopted Formwork or perfusion bags are installed around the construction, preferably perfusion bag construction, and drainage channels can be formed between the two shape adjustment layers under the board.

An isolation layer (7) is arranged between the bottom surface of the prefabricated track slab (2) and the adjustment layer (3); the isolation layer (7) is formed by geotextile, non-woven fabric or anti-sticking paint.

There are gaps between the adjacent prefabricated track slabs (2), and there is no connection or filling material between the adjacent prefabricated track slabs (2).

In the novel slab-type ballastless track described above, the base is a unit-block structure along the longitudinal direction, and transverse gaps are provided between adjacent base units, and the length of each base unit can be the length corresponding to one or more track slabs .

According to another aspect of the present utility model, a method for manufacturing the above-mentioned novel slab ballastless track includes the following steps:

1) Place the reinforcement mesh at the base, and pour concrete in blocks to form the base. When the base concrete reaches 70% strength, you can pour the limit boss, or reserve the boss reinforcement structure;

2) installing the prefabricated track slab, fine-tuning the position of the prefabricated track slab, and then setting the pressing device of the prefabricated track slab;

3) Filling layer material under the perfusion plate. If the concrete of the limit boss has been poured, two long strip-shaped pouring bags can be laid on the corresponding bottom of the rail bearing platforms on both sides of the track slab, and then the adjustment layer is filled under the pouring slab, and drainage can be formed between the two adjustment layers under the slab channel; if the limit boss reinforcement is reserved, it is also possible to pre-establish an isolation layer at the bottom of the track slab, set up a formwork around the cavity under the slab, and pre-install the rubber pad on the inner facade of the through hole of the track slab, and finally install the The material of the filling layer is poured in from the reinforcement of the reserved limit boss until it is full, and the boss and the filling layer under the slab are integrated, and the preferred material used is self-compacting concrete;

4) After the material of the filling layer under the slab is hardened, the elastic material of the damping layer can be installed or poured on-site in the gap between the through hole of the track slab and the limit boss (it can be omitted when the boss and the filling layer under the slab are poured together).

Preferably, the elastic material is a prefabricated rubber elastic pad or cast-in-place two-component polyurethane.

In the step 3), when erecting the template, an isolation layer is formed on the bottom surface of the track slab in advance.

Further, bonding geotextile, non-woven fabric or plastic cloth on the bottom surface of the prefabricated track slab as an isolation layer; or spraying anti-adhesive paint on the bottom surface as an isolation layer.

Optionally, in the step 3), when the perfusion bag is used, the bottom surface of the prefabricated track plate directly contacts the perfusion bag outside the adjustment layer.

The adjustment layer and the limiting boss can be cast integrally or separately.

In addition, the step 2) can only be performed after the strength of the base reaches more than 70% of the design strength.

Because the corresponding surface between the adjustment layer and the track plate of the utility model is a plane, the adjustment layer and the track plate are two layers separated from each other, which is different from the existing pre-embedded door type reinforcement under the track plate and the self-compacting concrete adjustment layer. Compared with the connection as an integral structure, the utility model can reduce the tensile stress of the adjustment layer, and the track plate bears greater tensile stress, which can give full play to the high-strength and high-rigidity function of the track plate; setting the through hole on the track plate reduces the The manufacturing cost also reduces the longitudinal temperature force on the track plate, greatly reducing the corner warpage of the unit plate track structure plate; the limit boss is in the middle of the track plate, which is convenient for the replacement of track plates and other components, and can be conveniently and quickly in case of uneven settlement. Carry out repairs such as lifting and rectifying. In addition, the limiting boss (5) can also be cast together with the adjustment layer, and the required adjustment layer mortar can be prepared on-site using a large number of currently idle mobile mortar trucks, which can greatly reduce the waste of raw materials and social resources, and reduce the number of bosses. The construction procedure improves the construction efficiency.

Therefore, the ballastless track type provided by the utility model is more reasonable in terms of structural design and force bearing, has good structural stability, durability and repairability, and good construction convenience, and can meet the needs of railways, light rails, subways, etc. Such as rail traffic high ride comfort and high stability requirements.

Description of drawings

The above and other aspects and features of the present utility model will be clearly presented from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the front view of the novel slab ballastless track according to Embodiment 1 of the present utility model;

Fig. 2 is a side sectional view of the new slab ballastless track according to Embodiment 1 of the present utility model;

Fig. 3 is a cross-sectional view of the new slab ballastless track according to Embodiment 1 of the present utility model;

Fig. 4 is a front view of the new slab ballastless track according to Embodiment 2 of the present utility model;

Fig. 5 is a side sectional view of the new slab ballastless track according to Embodiment 2 of the present invention;

Fig. 6 is a front view of the new slab ballastless track according to Embodiment 3 of the present invention;

Fig. 7 is a side sectional view of the new slab ballastless track according to Embodiment 3 of the present invention;

Fig. 8 is a cross-sectional view of the new slab ballastless track according to Embodiment 3 of the present utility model.

detailed description

A new type of slab ballastless track and its manufacturing method provided by the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The new slab ballastless track according to the utility model comprises a steel rail 1 , at least one prefabricated track slab unit and at least one base 4 . Each of the at least one prefabricated track slab unit is composed of a prefabricated track slab 2 and an adjustment layer 3 and is arranged on a corresponding base. In each prefabricated track slab unit, the adjustment layer 3 is arranged on the base 4, and the prefabricated track slab 2 is arranged on the adjustment layer 3 and at least one through hole is formed in the middle, and the adjustment layer 3 is provided with corresponding fittings on each The limiting boss 5 in the through hole has a shape corresponding to the shape of the through hole, and the steel rail 1 is arranged on the prefabricated track slab 2 . The number of prefabricated track slab units and bases can be arbitrarily selected according to the length of the track, so as to meet the requirements of various tracks.

According to the novel slab-type ballastless track of the present utility model, the corresponding surface between the adjustment layer 3 and the prefabricated track slab 2 is a plane, so that the adjustment layer and the prefabricated track slab are two separate layers, which is different from that of the existing track slab. Compared with the connection of the buried door type reinforcement and the self-compacting concrete adjustment layer as an integral structure, the tensile stress on the adjustment layer can be reduced, while the track slab bears greater tensile stress, that is, the two play their maximum role according to their respective stiffness . The ballastless track of the present utility model includes at least one base, and at least one prefabricated track slab unit is arranged on each base, and the unit block design of the base can reduce irregular cracking of the concrete base, improve the durability of the base, and The track plate, the adjustment layer and the base are layered structures and there is no bond between the track plate and the adjustment layer, which makes the structural force more reasonable and can improve the durability of the interlayer structure. In addition, because the prefabricated track slab adopts a unit block structure, when the track slab is subject to changes in the overall temperature load, it is only constrained by the fasteners and bosses on the track slab to reduce the longitudinal temperature force on the track slab, so the temperature The stress is much smaller than the temperature force on the continuous slab ballastless track, which meets the requirements of high smoothness and high stability of the railway. In addition, since at least one through hole is formed in the middle part of the prefabricated track plate 2, the adjustment layer 3 is provided with a limiting boss 5 correspondingly fitted in each through hole. Therefore, the boss passes through the surface of the track plate as a limit device to limit the lateral movement and longitudinal movement of the track plate on the base, so that the non-bonded design between the track plate and the adjustment layer can be obtained, and the correct geometric position of the track can be maintained. , to ensure the effective transmission of train loads, temperature loads, etc., and further improve the stability of the track structure. Furthermore, due to the hollow frame structure in the middle of the track slab, not only the dead weight and manufacturing cost of the track slab are greatly reduced, but also the gap gap caused by the warping of the four corners of the whole slab caused by temperature difference can be eliminated.

Further, the bottom surface of the prefabricated track slab 2 may be in direct contact with the adjustment layer 3 or an isolation layer may be provided therebetween. For example, as shown in FIGS. 1-3 , an isolation layer 7 is provided between the bottom surface of the prefabricated track slab 2 and the adjustment layer 3 . The isolation layer 7 can be formed of, for example, geotextile, non-woven fabric, plastic cloth or anti-sticking paint, but the material of the isolation layer is not limited thereto. An isolation layer is set between the prefabricated track slab and the adjustment layer to further facilitate the maintenance of the track.

In addition, a damping layer 6 is provided inside the limiting boss 5 and the prefabricated track slab 2 . For example, as shown in FIGS. 1-3 , a damping layer 6 is provided between the prefabricated track slab 2 and the limiting boss 5 . The vibration-damping layer 6 is formed of an elastic material. Preferably, the elastic material is a resin elastic material, more preferably, the elastic material is a prefabricated rubber elastic pad or cast-in-place two-component polyurethane. The materials mentioned here are only exemplary, and the material of the damping layer is not limited thereto, and any elastic material commonly used in the art can be used. Vibration of the track can be reduced by arranging a damping layer between the prefabricated track plate and the limiting boss.

Further, gaps are provided between adjacent prefabricated track slabs 2 , and there is no connection or filling material between adjacent prefabricated track slabs 2 . In addition, gaps are provided between adjacent bases 4 . Thus, the novel slab ballastless track of the utility model forms a block-type unit structure. The gaps between adjacent prefabricated track panels and the gaps between adjacent bases may or may not be aligned. Embodiment 1 of the present invention shows an embodiment of slot alignment.

In addition, the prefabricated track slab 2 can be, for example, a prefabricated C60 reinforced concrete frame slab, and the limiting boss 5 is, for example, made of reinforced concrete (or mortar) with a compressive strength above 30 MPa. According to an example, the adjustment layer 3 may adopt self-compacting concrete, self-leveling mortar, or polymer modified cement mortar and concrete.

Figures 1-3 show a new slab ballastless track according to Embodiment 1 of the present utility model, wherein a through hole is formed in the middle of a single prefabricated track slab 2, so that a limiting boss 5 is provided on a single adjustment layer. In Embodiment 1, the longitudinal side of the limiting boss 5 along the track direction is longer than the transverse side of the limiting boss.

Fig. 4 and Fig. 5 have shown the novel slab ballastless track according to embodiment 2 of the present utility model, and the difference between embodiment 2 and embodiment 1 is that the middle part of a single prefabricated track slab 2 is formed with a plurality of through holes, so that a single A plurality of limiting bosses 5 are arranged on the adjustment layer. Although the figure shows that the through hole is quadrilateral, the shape of the through hole is not limited thereto, and the limiting boss 5 may have any one or more of square, circular, straight and arc shapes.

As shown in Figures 6-8, a new slab ballastless track according to Embodiment 3 of the present invention is shown. In this embodiment, the boss is poured with concrete, and the filling layer under the rail bearing platform on both sides of the track slab is a polymer-cement composite low elastic modulus self-leveling mortar, and the long-strip pouring bag method is used for construction, which can reduce the amount by one third. The amount of filling layer material.

Next, the method for manufacturing the above-mentioned novel slab ballastless track according to the present invention will be described. Specifically, the manufacturing method according to the present invention comprises the following steps:

1) Place the reinforcement mesh at the base, and pour concrete in blocks to form the base. When the base concrete reaches 70% strength, you can pour the limit boss, or reserve the boss reinforcement structure;

2) installing the prefabricated track slab, fine-tuning the position of the prefabricated track slab, and then setting the pressing device of the prefabricated track slab;

3) If the limit boss (5) has been poured, first lay two long strips of pouring bags under the corresponding rail supports on both sides of the track plate, and then fill the adjustment layer under the perfusion plate; if only the limit boss is reserved (5) steel bars, after the isolation layer is pre-established at the bottom of the track slab, formwork is first set up around the cavity under the slab, and then the filling layer material is poured in from the reserved limit boss reinforcement until it is full;

4) After the material of the filling layer under the slab is hardened, the vibration-damping layer (6) elastic resin material between the through hole of the track slab (2) and the limit boss (5) can be poured on site; if the vibration-damping material is a prefabricated rubber pad slab, it shall be pre-installed inside the through hole of the track slab before pouring the filling layer material.

5) Rails are laid on the prefabricated track slab 2 .

Further optionally, an elastic material is pre-installed on the boundary of the at least one through hole or an elastic resin material is subsequently poured, so as to form a vibration-damping layer 6 between the prefabricated track plate 2 and the limiting boss 5 .

In the step 3), when erecting the template, an isolation layer 7 is formed on the bottom surface of the prefabricated track slab 2 in advance. Specifically, for example, a geotextile, non-woven fabric or plastic cloth is bonded to the bottom surface of the prefabricated track slab 2 as the isolation layer 7 , or a release coating is sprayed on the bottom surface as the isolation layer 7 . On the other hand, in the step 4), when the perfusion bag is laid, the bottom surface of the prefabricated track slab 2 directly contacts the adjustment layer 3 .

In addition, the adjustment layer 3 and the limiting boss 5 can be cast integrally or separately.

In addition, preferably, the step 2) can only be performed after the strength of the base 4 reaches more than 70% of the design strength, so as to ensure the strength and stability of the entire new slab ballastless track.

In addition, according to the concept of the utility model, the utility model can also be applied to the switch area by changing the appearance size of the prefabricated track slab and the parameters of the middle through hole according to the specific laying conditions of the switch. In this way, a simple and quick method can be adopted for the remediation and restoration of uneven settlement in the fork area in my country.

Although exemplary embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes may be made without departing from the spirit and principles of the present invention, the scope of which is defined in the claims and their equivalents limited.

Claims (9)

1. a New-type plate non-fragment orbit, comprise rail (1), fastener, precast track plate (2), plate retrofilling is adjusted layer (3), base (4), positive stop lug boss (5), wherein: described New-type plate non-fragment orbit comprises that at least one precast track plate (2) and adjustment layer (3) form and be arranged on a corresponding base, described precast track plate (2) is arranged on described adjustment layer (3) above and is formed with at least one through hole at middle part, described positive stop lug boss has the shape corresponding with the shape of described through hole, rail (1) is arranged on described precast track plate (2), described track plates is middle transmission frame form.

2. a kind of New-type plate non-fragment orbit according to claim 1, wherein, on described base (4), positive stop lug boss (5) is set, its position is corresponding with transmission place in the middle of precast track plate, and positive stop lug boss (5) outside dimension is less than track plates through hole.

3. a kind of New-type plate non-fragment orbit according to claim 1, wherein, described positive stop lug boss (5) is that single or multiple, corresponding track plates through holes is single or multiple, during for single through hole, its through hole direction along ng a path length of side is greater than its horizontal length of side; For in the middle of multiple when transmission framework, square, the circular and shape that formed by straight line and camber line that its framework can be.

4. a kind of New-type plate non-fragment orbit according to claim 1, wherein, arranges vibration damping layer (6) between described precast track plate (2) through hole and positive stop lug boss (5).

5. a kind of New-type plate non-fragment orbit according to claim 4, wherein, vibration damping layer (6) is made up of elastomeric material; Described elastomeric material is prefabricated caoutchouc elasticity backing plate or cast-in-place two component polyurethane.

6. a kind of New-type plate non-fragment orbit according to claim 1, wherein, described adjustment layer (3) can be selected the one in self-compacting concrete, gravity flowing levelling mortar, polymer emulsion-cementitious composite mortar, emulsified asphalt-cementitious composite mortar or concrete material.

7. a kind of New-type plate non-fragment orbit according to claim 1, wherein, arranges separation layer (7) between the bottom surface of described precast track plate (2) and described adjustment layer (3); Separation layer (7) is formed by geotextiles, nonwoven or release coating.

8. a kind of New-type plate non-fragment orbit according to claim 1, wherein, is provided with gap between described contiguous prefabricated track plates (2), and between adjacent precast track plate (2) without any connection or packing material.

9. a kind of New-type plate non-fragment orbit according to claim 1, described base (4) is longitudinally unit fraction block structure, adjacent pans is provided with transverse slot between unit, and each base unit length can be the length that one or more track plates is corresponding.