Recess structure for reinforcing connection between railway sleeper and track bed, and construction method

Abstract

Embodiments of the present invention disclose a recess structure for reinforcing a connection between a sleeper and a track bed (10), the recess structure being used in a ballastless track to reinforce the connection between a prefabricated sleeper unit and a subsequently-placed track bed (10). A reinforcing member (3) is provided at one or more sidewalls in a transverse direction of the sleeper, that is, in a longitudinal direction of the track. The reinforcing member (3) is a recess recessed inward from the sidewalls of the sleeper, such that during a pouring and placing process of the track bed (10), the recess and a certain height of the sleeper are buried in concrete of the track bed (10) and integrated with the same by means of concrete pouring, the concrete directly filling the recess so as to reinforce the connection between the sleeper and the track bed (10).

Description

A groove-type connection reinforcement structure between sleeper blocks and track bed and its construction method

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 201811550015.X, filed on December 18, 2018, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention belongs to the technical field of ballastless track, and relates to a technology for connecting multiple concrete blocks using steel pipe concrete, and more specifically to a groove-type connection reinforcement structure and construction method between sleeper blocks and track bed. Background Technology

[0004] In railway ballastless track systems, there is a type of prefabricated sleeper. The sleeper is installed in the ballast bed or is cast into the ballast bed with concrete. It is used to install fasteners to further secure the rails above and needs to maintain good connection performance with the ballast bed.

[0005] Chinese patent document CN105463948B discloses a steel-concrete composite sleeper suitable for ballastless tracks. Using steel-concrete composite as the connecting component of the sleeper block provides stronger overall integrity compared to conventional combined steel truss connections, effectively mitigating deformation of the concrete sleeper during storage and transportation. Furthermore, the integrated molding of the steel-concrete composite and the sleeper concrete block—that is, the steel-concrete composite being formed simultaneously with the pouring of the sleeper concrete block—and the design of the steel-concrete composite as composed of multiple hollow steel pipes effectively increases the sleeper's geometric shape retention capacity, reduces the amount of reinforcing steel, improves constructability, allows for direct on-site construction, and meets the sleeper's bending and torsional resistance requirements.

[0006] However, further research revealed that the aforementioned sleepers still have the following problems:

[0007] After concrete is poured into the steel pipe, it forms a steel-concrete composite. The surface of the steel-concrete composite is a relatively smooth steel surface. When it is directly embedded in materials such as concrete, recycled rubber, and resin, the bond force between it and the concrete is limited. Taking two steel pipes with an outer diameter of 40mm inserted into a concrete sleeper block with a depth of 200mm as an example, the bond force between them and the concrete is 2.5t. The connection between the steel-concrete composite and the sleeper block needs to be strengthened.

[0008] Precast double-block steel-concrete sleepers present difficulties in bundling, hoisting, and stacking during transport to the construction site.

[0009] The prefabricated concrete sleeper is carried to the track line construction site, and in the site pouring process of the track bed plate, the embedded part of the sleeper block is not firmly connected with the poured track bed plate concrete, and there are durability problems between the new and old concrete, which will produce cracks and other diseases, which still need to be improved.

[0010] SUMMARY

[0011] In order to solve at least one of the above defects or improvement needs of the prior art, the embodiments of the present application provide a groove type connection reinforcing structure between a sleeper block and a track bed and a construction method, which constructs a reinforcing member in the form of a groove on the side wall of the sleeper block, such as various grooves in the form of an arc, a circular arc, a polygon, and an irregular shape, and especially designs the position of the groove and the sleeper connecting member, so that the combination between the sleeper block and the track bed is more firm.

[0012] To achieve the above object, according to one aspect of the embodiments of the present application, a groove type connection reinforcing structure between a sleeper block and a track bed is provided, which is used to reinforce the connection between a prefabricated sleeper unit and a track bed in a ballastless track, the prefabricated sleeper unit includes two or more sleeper blocks and a connecting member connecting the sleeper blocks in the track transverse direction, the sleeper blocks are poured by concrete, the connecting member is constructed to be arranged in the manufacturing mold of the sleeper blocks and integrated with the sleeper blocks in the pouring process of the sleeper blocks, and a reinforcing member is constructed on one or more side walls in the track longitudinal direction, the reinforcing member is a groove recessed inward from the side wall of the sleeper block, so that in the pouring process of the track bed, part of the height of the sleeper block and the groove is embedded in the concrete of the track bed and integrated, and the concrete directly fills the groove to reinforce the connection between the sleeper block and the track bed.

[0013] In one embodiment, the overall center of the groove type reinforcing member in the vertical section in the track longitudinal direction is eccentrically arranged in the downward direction.

[0014] In one embodiment, the connecting member is a plurality of steel pipe concretes, the steel pipe concretes are constructed to be arranged in the manufacturing molds of two sleeper blocks adjacent to each other by using hollow steel pipes, integrated with the sleeper blocks in the pouring process of the sleeper blocks, and filled with concrete in the hollow steel pipes at the same time; and embedded in the track bed in the pouring process of the track bed, so that the sleeper block, the steel pipe concrete, and the track bed are integrated.

[0015] In one embodiment, the groove extends along the transverse direction of the track and penetrates the transverse side wall.

[0016] In one embodiment, the same transverse side wall includes a plurality of penetrating grooves arranged in parallel in the up-down direction.

[0017] In an embodiment, the groove extends along a transverse direction of the track, and a same transverse side wall comprises a plurality of the grooves, which are arranged in sequence and spaced apart in a longitudinal direction of the sleeper block.

[0018] In an embodiment, a same transverse side wall comprises a plurality of groups of the grooves arranged in sequence and spaced apart, and the grooves in each group are arranged in parallel from top to bottom, and the grooves in the groups arranged in parallel from top to bottom are arranged in sequence and spaced apart, and the spacing between the grooves in each group gradually decreases from bottom to top.

[0019] In an embodiment, the groove section size of the groove in the cross section of the sleeper block gradually increases from top to bottom.

[0020] Alternatively, when the groove extends from the transverse middle part of the track to the transverse outer side, the central height of the groove section of the groove in the cross section of the sleeper block gradually increases.

[0021] Alternatively, when the groove extends from the transverse middle part of the track to the transverse outer side, the groove depth of the groove in the cross section of the sleeper block gradually decreases.

[0022] Alternatively, when the groove extends from the transverse middle part of the track to the transverse outer side, the groove depth of the groove in the cross section of the sleeper block repeatedly fluctuates in the form of large-small-large, so that the bottom surface of the groove is in the form of a wave.

[0023] In an embodiment, the projection of the groove on a vertical plane along the longitudinal direction of the track has a vertical height component in addition to a horizontal length component on a horizontal plane.

[0024] In an embodiment, the groove further comprises a groove extending in the vertical direction on the side wall of the sleeper block.

[0025] In an embodiment, the lower end of the groove penetrates the bottom surface of the sleeper block.

[0026] In an embodiment, the groove extending in the vertical direction gradually increases in groove depth in the cross section of the sleeper block from top to bottom.

[0027] Alternatively, the groove extending in the vertical direction repeatedly fluctuates in the form of large-small-large in groove depth in the cross section of the sleeper block from top to bottom, so that the bottom surface of the groove is in the form of a wave.

[0028] Alternatively, the projection of the groove on a horizontal plane has a horizontal length component in the transverse direction of the track in addition to a vertical height component on a vertical plane along the longitudinal direction of the track.

[0029] Or, the plurality of up-and-down direction extending grooves are arranged in sequence and spaced apart in the lateral direction of the track, and the length of the plurality of up-and-down direction extending grooves decreases in sequence from the lateral middle part of the track to the lateral outside direction.

[0030] Or, the plurality of up-and-down direction extending grooves are arranged in sequence and spaced apart in the lateral direction of the track, and the length of the plurality of up-and-down direction extending grooves increases-decreases-increases in sequence.

[0031] In an embodiment, the depth of the sleeper block embedded in the track bed is 150mm; the central axis of the lowermost groove is 30-50mm away from the bottom surface of the sleeper block, and the groove diameter is 20-50mm.

[0032] To achieve the above object, according to another aspect of the embodiment of the present application, a groove type connection reinforcing structure between a sleeper block and a track bed is provided for reinforcing the connection between a prefabricated sleeper unit and the track bed in a ballastless track, the prefabricated sleeper unit comprising two or more sleeper blocks and a connecting piece connecting the sleeper blocks in the lateral direction of the track, the sleeper blocks being casted by concrete, the connecting piece being casted integrally with the sleeper blocks, and a reinforcing piece being constructed on one or more side walls in the longitudinal direction of the track, the reinforcing piece being a groove recessed inwardly from the side wall of the sleeper block, so that during the casting of the track bed, part of the height of the sleeper block and the groove are embedded in the concrete of the track bed and casted integrally, and the concrete directly fills the groove to reinforce the connection between the sleeper block and the track bed.

[0033] According to still another aspect of the embodiment of the present application, a construction method of the groove type connection reinforcing structure between a sleeper block and a track bed of any of the above is provided, comprising the following steps:

[0034] S1, a plurality of hollow steel pipes of a predetermined specification are made for subsequent production of concrete filled steel tubes;

[0035] S2, two molds of a predetermined specification are processed, and a protruding piece of a predetermined specification is detachably installed on the inner side of the mold at a height position of 30-50mm away from the bottom, so as to form a groove on the side wall of the sleeper block after casting concrete; and the two ends of the plurality of hollow steel pipes are respectively inserted into the two molds;

[0036] S3, concrete is casted so that the hollow steel pipes are filled with concrete to form concrete filled steel tubes, and the surrounding of the protruding piece is filled with concrete and vibrated and compacted;

[0037] S4, the maintenance of the sleeper is carried out together with the mold;

[0038] S5, dismounting the protruding piece, loosening the connection with the side surface of the mold, the protruding piece and the formed sleeper are demolded together, the protruding piece is separated from the formed sleeper, and a prefabricated sleeper unit with a groove is obtained;

[0039] S6, carrying the prefabricated sleeper unit to a track construction site, pouring concrete of the ballast bed, the concrete directly fills the groove, and the sleeper block and the concrete-filled steel tube reach the designed embedding depth, so that the sleeper block, the concrete-filled steel tube and the ballast bed are poured as a whole.

[0040] The above preferred technical features can be combined with each other as long as they do not conflict with each other.

[0041] Compared with the prior art, the above technical scheme conceived by the embodiments of the present application has the following beneficial effects in general:

[0042] 1. The groove type connecting reinforcing structure between the sleeper block and the ballast bed of the embodiments of the present application structures a groove type reinforcing piece on the sidewall and / or bottom surface of the sleeper block, such as various grooves with cross sections of arc shape, circular arc shape, polygonal shape, irregular shape, etc. In the on-site pouring process of the ballast bed, the prefabricated sleeper block is embedded in the concrete of the ballast bed, the concrete of the ballast bed directly fills the groove (without other structures between the two) and is poured as a whole, forming a locking effect, so that the sleeper block and the poured material are tightly combined. When subjected to longitudinal and transverse forces and upward and downward forces, the sleeper block and the poured material are combined together, the sleeper block is stably fixed in the ballast bed, and the sleeper block is not easy to loosen, and at the same time, it helps to reduce the cracks between the sleeper block and the ballast bed.

[0043] 2. In the groove type connecting reinforcing structure between the sleeper block and the ballast bed of the embodiments of the present application, the specific positions of the groove type reinforcing piece in the sleeper block are specially designed. Further research shows that the new and old concrete surfaces of the ordinary sleeper block and the ballast bed are flat surfaces. In the process of train operation, the sleeper block and the ballast bed form complex relative forces in the longitudinal and transverse directions and the upward and downward directions. After several years, cracks and other diseases may occur on the surface of the ballast bed plate and around the sleeper block. The existing technology focuses on reinforcing and maintaining the connection above the sleeper and ignores the internal diseases. Through theoretical analysis and actual test use, the embodiments of the present application specially set the groove eccentricity at the middle and lower parts of the sleeper block, especially the groove eccentricity at the middle and lower parts of the embedding depth of the sleeper block. For example, the height of the prefabricated sleeper block is generally 160mm-180mm, the embedding depth of the sleeper block in the ballast bed is generally about 150mm, the center axis of the groove at the lowermost part is close to the bottom surface of the sleeper block by 30-50mm, and the groove diameter is 20-50mm. The combination between the groove at this position and the ballast bed is more firm, the locking effect is better, this discovery and measure have not been reported in the existing technology, and after long-term train operation, the diseases at the internal connection between the sleeper block and the ballast bed can be effectively reduced.

[0044] 3. The groove-type connection reinforcement structure between the sleeper block and the track bed in this embodiment of the invention has broad application prospects. Domestic CRTS I type double-block ballastless track and CRTS II type double-block ballastless track, German Rheda2000 type and Zublin type slab tracks, as well as CRTS I type, CRTS II type, and CRTS III type slab ballastless tracks, can all adopt the groove-type reinforcement structure of this embodiment of the invention. In particular, in the double-block ballastless track with steel-concrete composite sleepers, the groove reinforcement component achieves the connection between the sleeper block, steel-concrete composite track, and track bed, making the three a closely integrated whole structure.

[0045] 4. In the groove-type connection reinforcement structure between the sleeper block and the track bed in this embodiment of the invention, multiple different combination schemes are provided through the construction of the grooves in a roughly horizontal direction and the construction of the relationship between multiple grooves. These schemes include through type, parallel type, and spaced type, which are used to reinforce different areas respectively. By adjusting the spacing, the grooves from the lower two sides to the upper middle groove are brought together, balancing the force on each area. Moreover, different strength levels are achieved, realizing the adjustment of the connection strength of the reinforcement structure and obtaining a comprehensive reinforcement effect with multi-level gradients, adapting to the strength requirements of different regions, while achieving a balance in terms of weight reduction and cost. At the same time, the upper and lower sets of grooves are set as a whole, still following the aforementioned depth eccentricity principle, with the overall center eccentrically set in the lower middle part of the sleeper block, especially in the lower middle part of the sleeper block's embedment depth.

[0046] 5. In the groove-type connection reinforcement structure between the sleeper block and the track bed in this embodiment of the invention, based on the aforementioned principle of depth eccentricity, in order to give full play to the main role of the groove with greater depth in the roughly horizontal direction, or to obtain the resistance force in multiple directions on the side wall plane, multiple groove configuration schemes are constructed. Each scheme can be used alone or combined arbitrarily. The grooves with multiple directional forces and multiple components are partially or entirely curved, such as wavy, broken line, and spiral configurations. This increases the contact length between the groove and the concrete in a unit size sleeper block, improves the fastening force, and thus improves the bonding degree between the sleeper block and the concrete of the track bed.

[0047] 6、The recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application, through the recess in the substantially vertical direction, improves the stress in the horizontal plane direction of the sleeper block and the track bed; the recesses in the substantially horizontal direction and the substantially resin direction can be used separately or in combination, and when used in combination, they can be crossed or not. And based on the aforementioned depth eccentricity principle, in order to play the main role of the lower part of the substantially vertical recess or obtain the resistance force in multiple directions on the plane of the side wall, multiple sets of recess configuration schemes are constructed, each of which can be used separately or combined arbitrarily. The recesses in multiple directions and multiple components are partially or entirely curved, such as wave-shaped, broken line-shaped, thread-shaped, etc. configuration, which increases the contact length of the recess and the concrete in the unit size of the sleeper block, improves the fastening force, and thus improves the bonding degree between the sleeper block and the concrete of the track bed. BRIEF DESCRIPTION OF DRAWINGS

[0048] Fig. 1 is a schematic view of the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application when the double sleeper block is used;

[0049] Fig. 2 is a side view of the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0050] Fig. 3 is a schematic view of multiple sets of substantially horizontal parallel recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0051] Fig. 4 is a side view of multiple sets of substantially horizontal parallel recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0052] Fig. 5 is a schematic view of substantially horizontal spaced recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0053] Fig. 6 is a first schematic view of multiple sets of substantially horizontal spaced recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0054] Fig. 7 is a second schematic view of multiple sets of substantially horizontal spaced recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application;

[0055] Fig. 8 is a schematic view of multiple sets of substantially vertical recesses in the recess type connecting reinforcing structure between the sleeper block and the track bed of the embodiment of the present application.

[0056] In the above drawings, the unit of the size mark is mm. DETAILED DESCRIPTION

[0057] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and not used to limit the embodiments of the present application. In addition, the technical features involved in the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments of the present application are further described in detail below with reference to the specific embodiments.

[0058] The embodiments of the present application provide a groove type connection reinforcing structure between a sleeper block and a track bed, which is used to reinforce the connection between a prefabricated sleeper unit and a post-poured track bed in a ballastless track, the prefabricated sleeper unit comprising two or more sleeper blocks 1 and a connecting piece connecting the sleeper blocks 1 in the track transverse direction, the sleeper blocks 1 being casted by concrete, and the connecting piece being configured to be arranged in a manufacturing mold of the sleeper blocks 1 and being casted integrally with the sleeper blocks 1 during the casting process of the sleeper blocks 1; and the connection reinforcing structure is arranged between the sleeper blocks 1 and the track bed. The post-poured track bed is the track bed 10.

[0059] As shown in FIGS. 1-8, a reinforcing piece 3 is configured on one or more side walls of the sleeper block 1 in the track transverse direction, i.e., the track longitudinal direction, the reinforcing piece 3 being a groove recessed inwardly from the side wall of the sleeper block 1 (as shown in FIG. 1), so that during the casting process of the track bed 10, part of the height of the sleeper block 1 and the groove are embedded in the concrete of the track bed 10 and are casted integrally, and the concrete directly fills the groove, so as to reinforce the connection between the sleeper block 1 and the track bed 10. The groove type connection reinforcing structure between the sleeper block and the track bed of the embodiments of the present application configures a groove type reinforcing piece on any side wall and / or bottom surface around the sleeper block, such as various grooves with cross sections of arc shape, circular arc shape, polygonal shape, irregular shape, etc. During the on-site casting process of the track bed, the prefabricated sleeper block is embedded in the concrete of the track bed, the concrete of the track bed directly fills the groove (without other structures therebetween) and is casted integrally, forming a locking effect, so that the sleeper block and the post-cast material are combined tightly, when subjected to longitudinal and transverse forces and upward and downward forces, the sleeper block and the post-cast material are combined together, the sleeper is stably fixed in the track bed, the sleeper block is not easy to loosen, and at the same time, it helps to reduce the cracks between the sleeper and the track bed.

[0060] In an embodiment, as shown in FIG. 2, the overall center of the groove-shaped reinforcing member 3 in the cross section of the sleeper block 1, i.e. the vertical section along the track longitudinal direction, is arranged eccentrically in the direction from the center of the sleeper block 1 to the lower side. In the groove-shaped connecting and reinforcing structure between the sleeper block and the track bed of the embodiment of the present application, the specific position of the groove-shaped reinforcing member in the sleeper block is specially designed. Further research shows that the new and old concrete surfaces of the ordinary sleeper block and the track bed are flat surfaces. During the operation of the train, the sleeper block and the track bed form complex relative forces in the longitudinal, transverse and vertical directions. After several years, cracks and other diseases may occur on the surface of the track bed plate and around the sleeper block. The prior art focuses on reinforcing and maintaining the connection at the top of the sleeper block and ignores the internal diseases. Through theoretical analysis and actual test use, the embodiment of the present application specially arranges the groove eccentrically in the middle and lower part of the sleeper block, especially in the middle and lower part of the embedding depth of the sleeper block. For example, the height of the prefabricated sleeper block is generally 160-180 mm, the embedding depth of the sleeper block in the track bed is generally about 150 mm, the center axis of the lowermost groove is close to the bottom surface of the sleeper block by 30-50 mm, and the groove diameter is 20-50 mm. The combination between the groove and the track bed at this position is more firm, and the locking effect is better. This discovery and measure have not been reported in the prior art. After long-term operation of the train, the diseases at the internal connection between the sleeper block and the track bed can be effectively reduced.

[0061] In an embodiment, the connecting member is a plurality of steel pipe concretes 2 (as shown in FIG. 1, omitted in FIG. 2). The steel pipe concrete 2 is arranged in the manufacturing mold of two sleeper blocks 1 adjacent to each other by using a hollow steel pipe. The hollow steel pipe is filled with concrete and is integrated with the sleeper block 1 during the pouring process of the sleeper block 1. The steel pipe concrete 2 is embedded in the track bed 10 during the pouring process of the track bed 10, so that the sleeper block 1, the steel pipe concrete 2 and the track bed 10 are integrated. In an embodiment, a connecting and reinforcing structure is arranged between the steel pipe concrete 2 and the sleeper block 1. Of course, the groove-shaped reinforcing member should be arranged to avoid the steel pipe concrete 2. The application prospect of the groove-shaped connecting and reinforcing structure between the sleeper block and the track bed of the embodiment of the present application is wide. The CRTS I type double-block ballastless track, the CRTS II type double-block ballastless track in China, the Rheda 2000 type and the Zublin type in Germany, the slab track, and the CRTS I type, the CRTS II type and the CRTS III type slab ballastless track can all adopt the groove-shaped reinforcing structure of the embodiment of the present application. Especially in the steel pipe concrete sleeper type double-block ballastless track, the groove-shaped reinforcing member realizes the connection between the sleeper block, the steel pipe concrete and the track bed two by two, so that the three become an integral structure.

[0062] In an embodiment, as shown in FIG. 1, the groove extends along the longitudinal direction of the sleeper block, i.e. the transverse direction of the track, and penetrates the transverse side wall; in an embodiment, as shown in FIGS. 3-4, the same transverse side wall includes a plurality of the penetrating grooves arranged in parallel from top to bottom. Here, the transverse side wall refers to the side walls on opposite sides of the sleeper block along the longitudinal direction of the track, i.e. the left and right side walls as shown in FIG. 4.

[0063] In an embodiment, as shown in FIG. 5, the groove extends along the longitudinal direction of the sleeper block, i.e. the transverse direction of the track, and the same transverse side wall includes a plurality of the grooves arranged in sequence and spaced apart in the longitudinal direction of the sleeper block 1; in an embodiment, as shown in FIGS. 6-7, the same transverse side wall includes a plurality of groups of the grooves arranged in sequence and spaced apart, each group is arranged in parallel from top to bottom, and the groups of the grooves arranged in parallel from top to bottom are arranged in sequence from bottom to top, and the spacing between the grooves in each group gradually decreases. Here, the transverse side wall refers to the side walls on opposite sides of the sleeper block along the longitudinal direction of the track, i.e. the left and right side walls as shown in FIG. 4.

[0064] In the groove type connecting reinforcing structure between the sleeper block and the track bed according to the embodiments of the present application, through the configuration of the substantially horizontal grooves and the configuration of the relationship between the plurality of grooves, a plurality of different combination schemes are provided, i.e. the penetrating type, the parallel type, and the spaced-apart type, which respectively reinforce different areas and balance the stress of each area by adjusting the spacing to converge from the lower two side grooves to the upper middle groove; and the different strength levels are provided to adjust the connecting strength of the reinforcing structure and obtain the comprehensive reinforcing effect of multiple levels of gradients, which is suitable for the strength requirements of different regions and balances the weight reduction and cost; meanwhile, the multiple groups of grooves from top to bottom still follow the aforementioned depth eccentricity principle to set the overall center eccentric to the middle and lower part of the sleeper block, especially the middle and lower part of the embedding depth of the sleeper block.

[0065] In an embodiment, the groove sections of the grooves arranged in up-down direction in the cross section of the sleeper block 1 increase in size from bottom to top; or, when the grooves extend from the lateral center of the track to the lateral outside, the center height of the groove sections in the cross section of the sleeper block 1 gradually increases; or, when the grooves extend from the lateral center of the track to the lateral outside, the depth of the groove sections in the cross section of the sleeper block 1 gradually decreases; or, when the grooves extend from the lateral center of the track to the lateral outside, the depth of the groove sections in the cross section of the sleeper block 1 fluctuates in a pattern of increasing-decreasing-increasing, so that the bottom surface of the groove is wavy. In an embodiment, the projection of the groove on the vertical plane of the track longitudinal direction has a vertical height component in addition to the water surface length component on the horizontal plane. In the groove type connecting and reinforcing structure between the sleeper block and the track bed of the embodiments of the present application, based on the aforementioned depth eccentricity principle, in order to play the main role of the groove with larger depth in the generally horizontal direction or to obtain the resisting force in multiple directions on the side wall plane, multiple groove configuration schemes are constructed, each of which can be used alone or combined arbitrarily. The grooves with multiple direction forces and multiple components are partially or entirely curved, such as wavy, zigzag, screw thread, etc., which increases the contact length of the groove and the concrete in the unit size of the sleeper block, improves the fastening force, and thus improves the bonding degree between the sleeper block and the concrete of the track bed.

[0066] In an embodiment, as shown in FIG. 8, grooves extending in the up-down direction on the side wall of the sleeper block are further included; in an embodiment, the lower end of the groove penetrates the bottom surface of the sleeper block.

[0067] In an embodiment, the groove extending in the vertical direction, from top to bottom, the groove depth in the cross section of the sleeper block 1 gradually increases; or, from top to bottom, the groove depth in the cross section of the sleeper block 1 repeatedly fluctuates in the form of increasing-decreasing-increasing, so that the bottom surface of the groove is wavy; or, in addition to the vertical height component in the projection on the track cross section, the projection on the horizontal plane also has a horizontal length component in the track transverse direction; or, a plurality of the grooves extending in the vertical direction are sequentially arranged in the transverse direction of the track, and the length, i.e. the vertical height, of the plurality of the grooves extending in the vertical direction sequentially decreases from the middle to the outside of the track transverse direction; or, a plurality of the grooves extending in the vertical direction are sequentially arranged in the transverse direction of the track, and the length, i.e. the vertical height, of the plurality of the grooves extending in the vertical direction repeatedly fluctuates in the form of increasing-decreasing-increasing. In the groove type connection reinforcing structure between the sleeper block and the track bed of the embodiment of the present application, the stress in the horizontal direction of the sleeper block and the track bed is improved through the groove in the substantially vertical direction; the groove in the substantially horizontal direction and the groove in the substantially resin direction can be used alone or in combination, and when used in combination, the combination can be crossed or not. And based on the aforementioned depth eccentricity principle, in order to play the main role of the lower part of the substantially vertical groove or obtain the resistance force in multiple directions on the side wall plane, a plurality of groove configuration schemes are constructed, each of which can be used alone or in combination. The groove in multiple directions and multiple components is partially or entirely curved, such as wavy, broken line, thread, etc., which increases the contact length of the groove and the concrete in the unit size of the sleeper block, improves the fastening force, and thus improves the bonding degree between the sleeper block and the concrete of the track bed.

[0068] The embodiment of the present application also provides a construction method of the groove type connection reinforcing structure between the sleeper block and the track bed as described above, which comprises the following steps:

[0069] S1, a plurality of hollow steel pipes of a predetermined specification are made, for example, 2 hollow steel pipes with a length of 2000mm and an outer diameter of 40mm, for subsequent production of the steel pipe concrete 2;

[0070] S2, two molds of a predetermined specification are processed, for example, a steel mold with a length of 650mm, a width of 300mm and a height of 150mm, and a protruding piece of a predetermined specification is detachably installed on the inner side of the mold at a height position of 30-50mm from the bottom, so as to form a groove on the side wall of the sleeper block after pouring the concrete, for example, a semicircular cylinder with a length of 600mm and a radius of 20mm to form a circular arc groove; and the two ends of the plurality of hollow steel pipes are inserted into the two molds, respectively.

[0071] S3, pouring concrete so that the hollow steel pipe is filled with concrete to form a steel pipe concrete 2, and the protruding member is filled with concrete and vibrated to be compacted;

[0072] S4, curing the sleeper together with the mold;

[0073] S5, disassembling the protruding member, releasing the connection with the side of the mold, and demolding the protruding member together with the formed sleeper to separate the protruding member from the formed sleeper to obtain a prefabricated sleeper unit with a groove;

[0074] S6, transporting the prefabricated sleeper unit to a track construction site, pouring concrete of the ballast bed 10, and directly filling the groove with the concrete, and the sleeper block 1 and the steel pipe concrete 2 reaching the designed buried depth, so as to pour the sleeper block 1, the steel pipe concrete 2 and the ballast bed 10 into one body.

[0075] Those skilled in the art will easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A groove-type connection reinforcement structure between a sleeper block and the track bed, used to strengthen the connection between a prefabricated sleeper unit and the track bed in ballastless track, wherein the prefabricated sleeper unit includes two or more sleeper blocks and a connector that connects the sleeper blocks in the transverse direction of the track. The sleeper blocks are cast from concrete. The connector is configured to be arranged in the manufacturing mold of the sleeper block and cast integrally with the sleeper block during the casting process. A reinforcement is constructed on one or more side walls in the longitudinal direction of the track. The reinforcement is a groove recessed inward from the side wall of the sleeper block, so that during the casting process of the track bed, a portion of the height of the sleeper block and the groove are embedded in the concrete of the track bed and cast integrally, and the concrete directly fills the groove to strengthen the connection between the sleeper block and the track bed.

2. The groove-shaped connection reinforcement structure between the sleeper block and the track bed as described in claim 1, wherein the groove-shaped reinforcement is eccentrically positioned with its overall center offset downwards on the longitudinal vertical section of the track.

3. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 1, wherein the connecting member is a plurality of steel pipe concrete, the steel pipe concrete structure is constructed by using hollow steel pipes arranged in the manufacturing molds of two adjacent sleeper blocks, and is cast together with the sleeper block during the casting process, while the hollow steel pipes are filled with concrete; the track bed is embedded in the track bed during the casting process, thereby the sleeper block, steel pipe concrete and track bed are cast together as a whole.

4. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 3, wherein the groove extends along the transverse direction of the track and penetrates the transverse sidewall.

5. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 4, wherein the same transverse sidewall includes multiple through grooves arranged in parallel vertically.

6. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 3, wherein the groove extends along the transverse direction of the track, and the same transverse sidewall includes multiple grooves, which are arranged sequentially at intervals in the longitudinal direction of the sleeper block.

7. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 6, wherein the same transverse sidewall includes multiple sets of spaced grooves, each set is arranged in parallel vertically, and the spacing between the grooves in each set gradually decreases from bottom to top.

8. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in any one of claims 4-7, wherein the size of the groove cross-section of the upper and lower grooves on the cross-section of the sleeper block increases sequentially from top to bottom; Alternatively, as the groove extends from the middle of the track to the outer side, the center height of the groove cross-section on the sleeper block gradually increases. Alternatively, as the groove extends from the transverse middle of the track to the transverse outer direction, the groove depth on the cross-section of the sleeper block gradually decreases. Alternatively, as the groove extends from the middle of the track to the outer side, the groove depth on the cross-section of the sleeper block fluctuates repeatedly, increasing and decreasing, thus making the bottom surface of the groove wavy.

9. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in any one of claims 4-7, wherein the groove has a water surface length component in its projection on the horizontal plane and a vertical height component in its projection on the longitudinal vertical plane of the track.

10. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in any one of claims 4-7 further includes a groove extending vertically on the side wall of the sleeper block.

11. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 10, wherein the lower end of the groove penetrates the bottom surface of the sleeper block.

12. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claim 10, wherein the groove extending in the vertical direction gradually increases in depth from top to bottom on the cross-section of the sleeper block; Alternatively, the groove extending vertically, from top to bottom, the groove depth on the cross-section of the sleeper block fluctuates repeatedly, increasing-decreasing-increasing, so that the bottom surface of the groove is wavy. Alternatively, the groove may have a vertical height component in its projection onto the track cross-section, and a horizontal length component in its projection onto the horizontal plane. Alternatively, multiple grooves extending in the vertical direction are arranged at intervals in the horizontal direction of the track, and the lengths of the multiple grooves extending in the vertical direction decrease sequentially from the middle of the horizontal direction of the track to the outer horizontal direction. Alternatively, multiple grooves extending in the vertical direction are arranged sequentially at intervals in the horizontal direction of the track, and the lengths of the multiple grooves extending in the vertical direction are repeatedly alternating between increasing and decreasing.

13. The groove-type connection reinforcement structure between the sleeper block and the track bed as described in claims 4-7, wherein the depth of the sleeper block embedded in the track bed is 150mm; the central axis of the lowest groove is 30-50mm close to the bottom surface of the sleeper block, and the groove diameter is 20-50mm.

14. A groove-type connection reinforcement structure between a sleeper block and the track bed, used to strengthen the connection between a prefabricated sleeper unit and the track bed in ballastless track, wherein the prefabricated sleeper unit includes two or more sleeper blocks and a connector that connects the sleeper blocks in the transverse direction of the track, the sleeper blocks are cast from concrete, the connector is cast integrally with the sleeper blocks, and a reinforcement is constructed on one or more side walls in the longitudinal direction of the track, the reinforcement being a groove recessed inward from the side wall of the sleeper block, so that during the casting of the track bed, a portion of the height of the sleeper block and the groove are embedded in the concrete of the track bed and cast integrally, and the concrete directly fills the groove to strengthen the connection between the sleeper block and the track bed.

15. A construction method for the groove-type connection reinforcement structure between the sleeper block and the track bed as described in any one of claims 3-14, comprising the following steps: S1. Fabricate multiple hollow steel pipes of predetermined specifications for subsequent steel pipe concrete production; S2. Process two molds of predetermined specifications, and detachably install protrusions of predetermined specifications on the inner side of the molds at a height of 30-50mm from the bottom, to form grooves on the side walls of the sleeper blocks after concrete is poured; and insert the two ends of multiple hollow steel pipes into the two molds respectively. S3. Pour concrete to fill the hollow steel pipe with concrete to form a steel pipe concrete, and fill the area around the protrusion with concrete and compact it. S4. Maintain the sleepers together with the molds; S5. Disassemble the protrusion, loosen the connection with the side of the mold, demold the protrusion together with the formed sleeper, separate the protrusion from the formed sleeper, and obtain a prefabricated sleeper unit with a groove. S6. Transport the precast sleeper unit to the track construction site, pour the concrete for the track bed, and directly fill the groove with concrete. The sleeper block and steel pipe concrete reach the designed embedment depth, thereby casting the sleeper block, steel pipe concrete and track bed into one piece.