阅读说明：本技术 提高cft枕式无砟轨道与下部基础连接性能的结构及方法 (Structure and method for improving connection performance of CFT (cement fly-ash gravel) sleeper-type ballastless track and lower foundation ) 是由 孙立 王森荣 闫亚飞 李启航 李秋义 杨艳丽 朱彬 张世杰 吴欢 张育红 丁正全 于 2020-08-11 设计创作，主要内容包括：本发明公开了一种提高CFT枕式无砟轨道与下部基础连接性能的结构,其特征在于：下部基础中位于CFT枕式无砟轨道的道床板下方的区域中,以矩阵形式均匀设置有若干从下部基础的基准面向上凸起的凸台,相邻的凸台之间形成为凹槽,凹槽的底面与下部基础的基准面平齐；道床板的浇筑混凝土覆盖并填满凸台和凹槽,增大轨道结构与基础表面的接触面积,使得下部基础与后浇的轨道结构更好的连接在一起,形成锁定的效果。该结构增强了轨道结构和下部基础的之间的连接作用,且增加了轨道结构的纵横向阻力,限制轨道结构的平面位移,同时施工简便、成本低廉,无需大型机械操作。该结构只需在工厂内进行加工,减少了在现场操作的工序,可控性强。(The invention discloses a structure for improving the connection performance of a CFT (cement fly-ash gravel) sleeper-type ballastless track and a lower foundation, which is characterized in that: in the lower foundation, a plurality of bosses which are upwards raised from the reference surface of the lower foundation are uniformly arranged in a matrix form in the area below the track bed plate of the CFT sleeper-type ballastless track, a groove is formed between every two adjacent bosses, and the bottom surface of the groove is flush with the reference surface of the lower foundation; the bosses and the grooves are covered and filled with the poured concrete of the ballast bed plate, the contact area between the track structure and the surface of the foundation is increased, the lower foundation and the post-poured track structure are connected together better, and the locking effect is formed. The structure enhances the connection effect between the track structure and the lower foundation, increases the longitudinal and transverse resistance of the track structure, limits the plane displacement of the track structure, and has the advantages of simple and convenient construction, low cost and no need of large-scale mechanical operation. The structure only needs to be processed in a factory, so that the procedures of field operation are reduced, and the controllability is strong.)

1. The utility model provides an improve structure of CFT pillow-type ballastless track and lower part basis connection performance which characterized in that:

in an area (2) below a track bed plate of the CFT sleeper-type ballastless track in the lower foundation (1), a plurality of bosses (3) protruding upwards from the reference surface of the lower foundation (1) are uniformly arranged in a matrix form, grooves (4) are formed between the adjacent bosses (3), and the bottom surfaces of the grooves (4) are flush with the reference surface of the lower foundation (1); the pouring concrete of the ballast bed plate covers and fills the boss (3) and the groove (4) and is connected with the lower foundation (1).

2. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the lower foundation (1) is a bridge beam surface.

3. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the lower foundation (1) is a tunnel inverted arch.

4. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the transverse and longitudinal distances between the bosses (3) are both 50 mm.

5. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the boss (3) is a prismatic table, and the area of the upper surface of the prismatic table is smaller than that of the lower surface of the prismatic table.

6. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 5, wherein:

the lower surface of the prismatic table is a rectangle of 50mm multiplied by 50mm, the upper part of the upper surface is a rectangle of 45mm multiplied by 45mm, and the height is 10 mm.

7. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the boss (3) is a polygonal cylinder.

8. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 7, wherein:

the boss (3) is a hexagonal cylinder with the lower part and the upper part both having the side length of 25 mm.

9. The structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to claim 1, wherein:

the boss (3) is an equilateral triangle cylinder with the side length of 50mm at the lower part and the upper part.

10. A method for improving the connection performance of a CFT (cement fly-ash gravel) sleeper-type ballastless track and a lower foundation is characterized by comprising the following steps:

firstly, in the process of processing a lower foundation (1) of a CFT (cement fly-ash gravel) sleeper-type ballastless track, embossing at the contact position of the surface of the lower foundation (1) and a track bed board through a mould to form a plurality of bosses (3) which are uniformly arranged in a horizontal and longitudinal direction and are in a matrix form, wherein the bosses (3) are in the shape of prismatic platforms or polygonal columns, and the rest parts are through grooves (4);

secondly, after the concrete of the lower foundation (1) reaches initial setting, the mould is dismantled, and the lower foundation (1) is maintained;

and thirdly, before a track bed slab of the CFT sleeper-type ballastless track is poured, cleaning the surface of the lower foundation (1), wetting with water, pouring track bed concrete, and covering and filling the boss (3) and the groove (4), so that the connection performance of the lower foundation (1) and a post-poured CFT sleeper-type ballastless track structure is improved.

Technical Field

The invention belongs to the field of novel ballastless tracks, and particularly relates to a structure and a method for improving the connection performance of a CFT (circulating fluid bed) sleeper-type ballastless track and a lower foundation.

Background

At present, aiming at CFT (cement fly-ash concrete) sleeper-type ballastless tracks, a method for connecting a track structure with lower foundations such as a bridge beam surface, a tunnel inverted arch and the like mainly comprises two methods of arranging a reserved steel bar on the surface of the foundation and napping the foundation.

The former has a simple construction but a weak connection ability.

The latter mainly has two forms of artificial napping and mechanical napping. The artificial napping is not easy to control, and the phenomenon of non-uniformity exists; although the mechanical roughening efficiency is high, the operation space is large, special people are needed for safety management and taking charge of commanding and construction, and the required cost is high.

Disclosure of Invention

Aiming at least one of the defects or improvement requirements in the prior art, the invention provides a structure and a method for improving the connection performance of a CFT (cement fly-ash-gravel) sleeper-type ballastless track and a lower foundation. When the track bed slab is poured, the grooves in the surface of the foundation are filled with concrete materials, so that the lower foundation and the post-cast track structure are connected together better.

In order to achieve the above object, according to an aspect of the present invention, there is provided a structure for improving connection performance of a CFT sleeper-type ballastless track and a lower foundation, wherein:

a plurality of bosses which protrude upwards from the reference surface of the lower foundation are uniformly arranged in a matrix form in the area, below the track bed plate, of the CFT sleeper-type ballastless track, a groove is formed between every two adjacent bosses, and the bottom surface of the groove is flush with the reference surface of the lower foundation; the pouring concrete of the ballast bed plate covers and fills the lug boss and the groove and is connected with the lower foundation.

Preferably, the lower foundation is a bridge deck.

Preferably, the lower foundation is a tunnel invert.

Preferably, the transverse and longitudinal spacing between the bosses is 50 mm.

Preferably, the boss is a frustum pyramid, and the area of the upper surface of the frustum pyramid is smaller than that of the lower surface.

Preferably, the lower surface of the prismatic table is a rectangle of 50mm multiplied by 50mm, the upper surface of the prismatic table is a rectangle of 45mm multiplied by 45mm, and the height of the prismatic table is 10 mm.

Preferably, the boss is a polygonal cylinder.

Preferably, the boss is a hexagonal cylinder with the lower part and the upper part both having a side length of 25 mm.

Preferably, the boss is an equilateral triangle cylinder with the side length of 50mm at the lower part and the upper part.

In order to achieve the above object, according to another aspect of the present invention, there is provided a method for improving connection performance of a CFT sleeper-type ballastless track and a lower foundation, comprising the steps of:

in the process of processing the lower foundation of the CFT pillow-type ballastless track, embossing the contact position of the surface of the lower foundation and a track bed board through a mold to form a plurality of bosses which are uniformly arranged in a matrix form transversely and longitudinally, wherein the bosses are prismatic tables or polygonal columns, and the rest parts are through grooves;

secondly, after the concrete of the lower foundation reaches initial setting, the mould is dismantled, and the lower foundation is maintained;

and thirdly, before a track bed slab of the CFT sleeper-type ballastless track is poured, cleaning the surface of the lower foundation, wetting with water, pouring track bed concrete, and covering and filling the lug bosses and the grooves, so that the connection performance of the lower foundation and the post-poured CFT sleeper-type ballastless track structure is improved.

The above-described preferred features may be combined with each other as long as they do not conflict with each other.

Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

1. according to the structure and the method for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation, when the lower foundation is processed, embossing is carried out on the bridge beam surface and the tunnel inverted arch through the die to form the boss. When the track bed board is poured, the grooves among the bosses on the beam surface of the bridge are filled with concrete materials, the contact area between the track structure and the surface of the foundation is increased, the lower foundation and the post-poured track structure are connected together better, and the locking effect is formed. The structure enhances the connection effect between the track structure and the lower foundation, increases the longitudinal and transverse resistance of the track structure, limits the plane displacement of the track structure, and has the advantages of simple and convenient construction, low cost and no need of large-scale mechanical operation.

2. Compared with the traditional roughening mode, the structure and the method for improving the connection performance of the CFT pillow-type ballastless track and the lower foundation only need to be processed in a factory, so that the procedures of field operation are reduced, and the controllability is high. Meanwhile, the pollution of manpower and material resources used in the scabbling process and the generated dust is avoided.

Drawings

Fig. 1 is a schematic plan view of a structure for improving the connection performance of a CFT sleeper-type ballastless track and a lower foundation according to the present invention;

FIG. 2 is an enlarged, fragmentary view of the boss of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken at I-I in FIG. 1;

FIG. 4 is a schematic cross-sectional view II-II of the bridge deck of FIG. 1;

FIG. 5 is a schematic cross-sectional view II-II of the tunnel invert of FIG. 1;

fig. 6 is a schematic diagram of a second form of the structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to the embodiment of the invention;

FIG. 7 is an enlarged partial schematic view of the boss of FIG. 6;

fig. 8 is a schematic view of a third form of the structure for improving the connection performance of the CFT sleeper-type ballastless track and the lower foundation according to the embodiment of the invention;

fig. 9 is an enlarged partial schematic view of the boss of fig. 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.