Double-hole limiting type ballastless track structure of prefabricated track plate

Abstract

A novel double-hole limiting type prefabricated track slab ballastless track structure for track traffic is composed of steel rails, elastic fasteners, prefabricated track slabs, limiting piles, an isolating layer, a filling layer, a base and the like, and the prefabricated track slabs are of a prestressed structure and a non-prestressed structure. A hole penetrating through the thickness direction of the track plate can be reserved in the prefabricated track plate so as to pour a filling layer material and observe the pouring state, and a special hoisting sleeve for pre-burying hoisting is installed; therefore, the fast line laying device can meet the requirement for laying of city fast lines with the speed grade of 160-200 km / m, has the advantages of being safe and reliable in quality, high in construction efficiency, little in environmental pollution, convenient and fast to maintain in the later period, good in economical efficiency and the like, meets the requirements for environmental protection, cost reduction, efficiency improvement and disease reduction of current rail transit, and achieves high-quality development of the rail transit.

Description

Technical Field

[0001] This utility model relates to the field of rail transit track structures, and in particular to a double-hole limiting prefabricated track slab ballastless track structure for rail transit. Background Technology

[0002] Urban rail transit has become a major solution to traffic problems in large and medium-sized cities. The growth of lines has led to a diversification of urban rail transit systems. In addition to traditional subway systems, intercity express rail systems are also booming. Express rail systems represent an important future development direction for urban rail transit, and are generally classified into several levels according to their design speed, such as 120 km / h, 160 km / h, and 200 km / h.

[0003] Currently, intercity railways with speeds of 200 km / h mostly use ballasted track or twin-block ballastless track. Ballasted track has a simple structure, is easy to lay, and has low construction costs, but its track geometry is difficult to guarantee, and its load-bearing and transport capacity is relatively low. Maintenance and repair work is also extensive, and the higher the operating speed, the more frequent and labor-intensive the maintenance and repair work becomes. Urban express lines have high traffic density and short maintenance windows, making ballasted track unsuitable. Twin-block ballastless track is a cast-in-place structure, requiring extensive on-site reinforcement binding and concrete pouring, making construction quality difficult to control. Especially in cold regions, it is prone to defects such as sleeper delamination and track bed cracking, and construction efficiency is also low, failing to meet the high standards and green construction requirements of urban express lines. Precast track slabs offer an aesthetically pleasing and reliable appearance, significantly improving the modularity and mechanization of construction. More importantly, the precast track slabs provide a degree of adjustability, overcoming the requirement for post-construction settlement of the subgrade, ensuring high smoothness during long-term operation. This also facilitates future upgrades and renovations, resulting in substantial socio-economic benefits. Therefore, the adoption of precast track slab ballastless track structures should be actively promoted for urban express lines.

[0004] In the railway sector, ballastless track, especially slab track, is widely used in high-speed railways, and its technology is relatively mature. Currently, the slab track structures mainly used in my country's passenger dedicated lines include CRTSⅠ, CRTSⅡ, and CRTSⅢ types. Among them, the CRTSⅢ type slab track is an innovative slab track with independent intellectual property rights, proposed based on the engineering experience of CRTSⅠ, CRTSⅡ, and double-block ballastless tracks. It is the main track structure type promoted for high-speed railways.

[0005] The design speed of the urban express line is 160-200 km / h. At present, there is no slab track structure in the field of urban rail transit that is technically mature and widely used for this speed level. If the mature CRTSⅢ type slab track of the national railway is directly adopted, the economic efficiency is poor. Moreover, due to the difference in civil engineering structure and equipment system, the CRTSⅢ type slab track must be optimized in combination with the characteristics of urban rail transit.

[0006] Therefore, in view of the above-mentioned defects, the designer of this utility model, through dedicated research and design, and by integrating years of experience and achievements in related industries, has researched and designed a double-hole limiting prefabricated track slab ballastless track structure to overcome the above defects and is suitable for urban express lines with speed levels of 160-200 km / m. Utility Model Content

[0007] The purpose of this utility model is to provide a double-hole limiting precast track slab ballastless track structure, which has a simple structure, is easy to operate, and has the characteristics of fast construction speed, high laying accuracy, and good track smoothness. It can effectively overcome the problems existing in the existing track structure.

[0008] To achieve the above objectives, this utility model discloses a double-hole limiting precast track slab ballastless track structure, which is a multi-layer structure comprising, from top to bottom, a rail, fasteners, a precast track slab, an isolation layer, a filling layer, and a base. Its features are as follows:

[0009] The base is the bottom layer, placed on the lower foundation. The filling layer is laid on the base, and the isolation layer is laid on the filling layer to provide elastic cushioning and prevent rapid damage. The precast track slab is placed on the isolation layer. The precast track slab has two parallel steel rails, each of which is fixed to the precast track slab by multiple fasteners. The precast track slab has two limiting holes and one injection hole. The two limiting holes are spaced apart along the longitudinal axis of the precast track slab, and the injection hole is located between the two limiting holes. The limiting holes and the injection hole penetrate the entire precast track slab and the isolation layer. The filling layer is injected and formed through the limiting holes and the injection hole, and after injection, limiting posts of the precast track slab are formed in the two limiting holes.

[0010] The precast track slab can be either a prestressed structure or a non-prestressed structure.

[0011] Among them, eight lifting sleeves are pre-embedded on the side of the precast track slab.

[0012] Wherein: elastic isolation sleeves are installed in the limiting hole and the injection hole to ensure that the filling material does not enter between the precast track slab and the isolation layer when the filling layer is injected from the hole, and to form a buffer effect between the precast track slab and the limiting pile.

[0013] The precast track slab has a limiting hole and a filling hole with a smaller upper part and a larger lower part. The inner diameter of the elastic isolation sleeve is straight up and down, so as not to restrict the vertical displacement of the precast track slab and to facilitate the maintenance and replacement of the precast track slab.

[0014] The filling layer uses self-compacting concrete to provide fluidity and support. The length and width of the filling layer formed by the self-compacting concrete are the same as those of the precast track slab.

[0015] Among them: the filling layer formed by self-compacting concrete is equipped with a single layer of welded wire mesh.

[0016] Wherein: the base is a reinforced concrete structure, expansion joints are provided between adjacent bases, the expansion joints are filled with closed-cell polyethylene foam boards, and the top and sides are sealed with silicone caulking material.

[0017] The isolation layer is made of polyurethane material or geotextile.

[0018] As described above, the double-hole limiting precast track slab ballastless track structure of this utility model is suitable for manual or automated special equipment laying. This track structure system sequentially includes factory-prefabricated track slabs, an isolation layer that can be laminated onto the track slab surface in the factory or on-site, a filling layer that adjusts the flatness of the precast track slabs, and a base connecting to the underlying foundation. The main construction process sequence of the double-hole limiting precast track slab ballastless track structure is: precast track slab structure production in the factory or on-site → lamination of the isolation layer in the factory or on-site → on-site pouring of the base and subsequent pouring of the filling layer beneath the track slab.

[0019] Its advantages are:

[0020] 1. High-precision reinforced concrete track slabs are prefabricated in the factory or on-site using high-precision molds. A special rail support platform is set on the surface of the track slab, and fasteners for connecting the rails are installed on the rail support platform.

[0021] 2. The filling layer is made of self-compacting concrete to ensure good fluidity and uniform distribution. A single layer of welded steel mesh is installed inside the filling layer to improve construction speed and accuracy.

[0022] 3. The construction process is simple, the construction speed is fast, the construction precision is high, the track smoothness is good, and the labor intensity is low. It is in line with the current direction of environmental protection, high efficiency and reduction of defects in rail transit, and has great social benefits.

[0023] The details of this utility model can be obtained from the following description and the accompanying drawings. Attached Figure Description

[0024] Figure 1 The diagram shows the structural schematic of the double-hole limiting prefabricated track slab ballastless track structure of this utility model.

[0025] Figure 2 The top view of this utility model is shown.

[0026] Figure label:

[0027] 1. Rail; 2. Fastener; 3. Precast track slab; 4. Limiting pile; 5. Isolation layer; 6. Filling layer; 7. Base; 8. Lifting sleeve; 9. Elastic isolation sleeve. Detailed Implementation

[0028] See Figure 1 and 2 This demonstrates the double-hole limiting prefabricated track slab ballastless track structure of this utility model.

[0029] like Figure 1 As shown, the double-hole limiting precast track slab ballastless track structure is a multi-layer structure, which includes, from top to bottom, rails 1, fasteners 2, precast track slabs 3, isolation layer 5, filling layer 6, and base 7. In the entire structure, the base 7 is the bottom layer, which is set on the lower foundation. The filling layer 6 is laid on the base 7. Preferably, the filling layer is made of self-compacting concrete, which provides good fluidity during pouring and provides good support. The isolation layer 5 is laid on the filling layer 6 to provide elastic buffer for the filling layer 6 and prevent its rapid damage. Optionally, the isolation layer 5 is made of polyurethane material or geotextile, which can provide good vibration reduction effect. The precast track slab 3 is set on the isolation layer 5. The precast track slab 3 has two parallel rails 1, and each rail 1 is fixed to the precast track slab 3 by multiple fasteners 2.

[0030] See also Figure 2 The precast track slab 3 is provided with two limiting holes and one injection hole. The two limiting holes are spaced apart along the longitudinal axis of the precast track slab 3. The injection hole is located between the two limiting holes. The limiting holes and the injection hole penetrate the entire precast track slab 3 and the isolation layer 5. The filling layer 6 is injected and formed through the limiting holes and the injection hole. After injection and forming, the limiting piles 4 of the precast track slab 3 are formed in the two limiting holes.

[0031] Optionally, the precast track slab 3 can be either a prestressed structure or a non-prestressed structure.

[0032] Eight lifting sleeves are pre-embedded on the side of the precast track slab 3.

[0033] Elastic isolation sleeves 9 are installed in the limiting hole and the injection hole to ensure that the filling material is prevented from entering between the precast track slab 3 and the isolation layer 5 when the filling layer is injected from the hole, and at the same time, a buffer effect is formed between the precast track slab 3 and the limiting pile 4.

[0034] The limiting holes and injection holes of the precast track slab 3 adopt a structure with a smaller upper part and a larger lower part, and the inner diameter of the elastic isolation sleeve 9 adopts a straight upper and lower structure, which not only does not restrict the vertical displacement of the precast track slab 3, but also facilitates the maintenance and replacement of the precast track slab 3.

[0035] The precast track slab 3 is manufactured in a factory, and the isolation layer 5 is integrated with the precast track slab 3 in the factory or laid on site.

[0036] The filling layer 6 is filled with self-compacting concrete. The length and width of the self-compacting concrete layer are the same as those of the track slab, and a single layer of steel wire mesh is provided. Two bosses are set in the self-compacting concrete layer for each track slab. The limiting bosses are in the shape of a frustum, and the diameter of the top surface is smaller than the diameter of the bottom surface.

[0037] The base 7 is a reinforced concrete structure. The base 7 under multiple precast track slabs under the elevated line can be an integral unit, and the structural joints between the base 7 are not treated. The U-shaped channel, transition section and circular tunnel are set as an integral unit base under three precast track slabs. Expansion joints are set between adjacent bases. The expansion joints are filled with closed-cell polyethylene foam plastic boards, and the top and sides are sealed with silicone caulking material.

[0038] Therefore, this utility model, when applied to the field of rail transit, features simple construction procedures, fast construction speed, high construction precision, good track smoothness, and low labor intensity. It aligns with the current direction of environmental protection, high efficiency, and reduced defects in rail transit, and has significant social benefits.

[0039] It is obvious that the above description and account are merely illustrative and not intended to limit the disclosure, application, or use of this utility model. Although embodiments have been described and illustrated in the accompanying drawings, this utility model does not limit the specific examples exemplified by the drawings and described in the embodiments as currently considered the best mode for implementing the teachings of this utility model. The scope of this utility model shall include any embodiments falling within the foregoing description and the appended claims.

Claims

1. A double-hole limiting precast track slab ballastless track structure, which is a multi-layer structure, comprising, from top to bottom, rails, fasteners, precast track slabs, isolation layers, filling layers, and a base, characterized in that: The base is the bottom layer, placed on the lower foundation. The filling layer is laid on the base, and the isolation layer is laid on the filling layer to provide elastic cushioning and prevent rapid damage. The precast track slab is placed on the isolation layer. The precast track slab has two parallel steel rails, each of which is fixed to the precast track slab by multiple fasteners. The precast track slab has two limiting holes and one injection hole. The two limiting holes are spaced apart along the longitudinal axis of the precast track slab, and the injection hole is located between the two limiting holes. The limiting holes and the injection hole penetrate the entire precast track slab and the isolation layer. The filling layer is injected and formed through the limiting holes and the injection hole, and after injection, limiting posts of the precast track slab are formed in the two limiting holes.

2. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: The precast track slabs are of two types: prestressed structure and non-prestressed structure.

3. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: Eight lifting sleeves are pre-embedded on the side of the precast track slab.

4. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: The limiting hole and the injection hole are equipped with elastic isolation sleeves to ensure that the filling material does not enter between the precast track slab and the isolation layer when the filling layer is injected from the hole, and to form a buffer between the precast track slab and the limiting pile.

5. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 4, characterized in that: The limiting holes and injection holes of the precast track slab adopt a structure with a smaller upper part and a larger lower part. The inner diameter of the elastic isolation sleeve adopts a straight upper and lower structure, so as not to restrict the vertical displacement of the precast track slab and to facilitate the maintenance and replacement of the precast track slab.

6. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: The infill layer is filled with self-compacting concrete to provide fluidity and support. The length and width of the infill layer formed by the self-compacting concrete are the same as those of the precast track slab.

7. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 6, characterized in that: The self-compacting concrete forms a filling layer with a single layer of welded wire mesh.

8. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: The base is a reinforced concrete structure, with expansion joints between adjacent bases. The expansion joints are filled with closed-cell polyethylene foam boards, and the top and sides are sealed with silicone sealant.

9. The double-hole limiting prefabricated track slab ballastless track structure as described in claim 1, characterized in that: The isolation layer is made of polyurethane material or geotextile.

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