Ballastless track base plate pre-embedding positioning tool based on groove support

Abstract

A ballastless track base plate pre-embedded positioning tool based on a groove support comprises a limiting groove and the support, the limiting groove and the support are provided with longitudinal beams, the longitudinal beams are connected with positioning cross beams, the positioning cross beams are connected with pre-embedded parts in a suspended mode through screws, and the pre-embedded parts are arranged in a base plate pouring space S; the top face of the embedded part is not higher than the top face of the pouring space. According to the pre-embedded positioning tool, the position of the pre-embedded part is kept fixed in the pouring process of the track plate, a fixed stress point can be provided for a follow-up limiting tool, the pre-embedded positioning tool is simple and convenient in structural design, accurate positioning of the pre-embedded tool is achieved, and meanwhile it can be guaranteed that the position of the pre-embedded tool is stable in the pouring process of self-compacting concrete. Besides, the arrangement position of the embedded part is adjusted on the top face of the base plate, limiting and fixing of the buckling and pressing tool can be conveniently achieved in a bolt fixed connection mode, meanwhile, the structural design of the adjacent area of the embedded hole is enhanced, and the adverse situation that the structure of the embedded hole is damaged is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of CRTS III - type slab ballastless track construction, and particularly to a pre - embedded positioning tool for the base slab of a CRTS III - type slab ballastless track based on a groove support. Background Technique

[0002] The CRTS III - type slab ballastless track construction technology is a ballastless track construction technology with complete independent intellectual property rights in China after absorbing the I - type and II - type slab tracks of Japanese and German patents. The main feature of the CRTS III - type slab ballastless track is that the filling layer material under the slab is changed to self - compacting concrete, replacing the CA mortar commonly used in the I - type and II - type slab tracks, and has many advantages such as strong overall stability, good stiffness uniformity, and strong durability.

[0003] When laying and constructing the CRTS III - type slab ballastless track, it is necessary to pour self - compacting concrete ( Figure 1 shaded area) on site to make the combination of the track slab 1, the self - compacting concrete layer and the base slab firm, as Figure 1 shown. During the pouring process of the self - compacting concrete, the cavity between the track slab 1 and the base slab is gradually filled, and the self - compacting concrete will generate a large upward floating force on the track slab 1 during the flowing process. Usually, it is necessary to use a buckling and limiting tool 102 to apply a vertical downward force to the track slab 1 to offset the vertical displacement generated by the track slab 1 under the action of the upward floating force. In the prior art, the fixed stress points of the limiting buckling tool 102 are usually arranged at the horizontal position on the side of the base slab, and the connection method is mainly in the form of reinforced hinge. In practical applications, various problems such as the displacement of the buckling tool, the cracking and damage of the stress points of the base slab, and the upward floating deformation of the track slab often occur, which not only increases the number of non - standard fasteners of the track slab and the construction cost, but also seriously affects the construction progress.

[0004] Through retrieval, there are patent documents for the construction tooling of the ballastless track base plate disclosed in the prior art. For example, the utility model patent with the publication number "CN207314062U" and the name "A complete set of construction tooling for the base plate of CRTS III type slab ballastless track". It discloses a complete set of construction tooling for the base plate of CRTS III type slab ballastless track, which is used for the construction of the base plate of CRTS III type slab ballastless track in high-speed railways. It can accurately control the slopes of the drainage slopes on both sides of the base plate and the flatness of the top surface, belonging to the technical field of high-speed railway construction. It includes: base side formwork, expansion joint formwork, limit groove and support, slope adjustment plate, support system; the base side formwork includes standard sections and adjustment sections; the standard section is the basis for template configuration, and embedded sleeves are arranged at the lower part of the base plate side formwork; the expansion joint formwork includes steel plates, pressing plates, and G-type clamps; the expansion joint formwork uses G-type clamps to clamp the square steel and the caulking material to the steel plate, and the caulking material is placed under the pressing plate and is closely attached to the steel plate. This comparative document discloses a complete set of tooling for casting the base plate. The core of this technical solution is to optimize and improve the complete set of template tooling in the construction of the base plate. Although this tooling also has embedded sleeves, their layout positions are at the lower part of the base plate side formwork, and there are no obvious differences in the layout positions and forms of the embedded sleeves in the existing technical solution, and the specific design scheme of the embedded sleeves is not disclosed.

[0005] The publication number is "CN206916539U" and the name is "An L-shaped bar connection structure for the base plate of CRTS III type slab ballastless track". It discloses an L-shaped bar connection structure for the base plate of CRTS III type slab ballastless track, including: pre-embedded steel bars in the beam, sleeves, and steel bars in the base plate. The steel bars in the base plate and the sleeves are pre-embedded below the top surface of the beam, and the pre-embedded steel bars in the beam are connected to the steel bars in the base plate through the sleeves. This comparative document mainly solves the problems related to the quality of the L-shaped bar post-inserted bars in the base plate and does not involve the technical solution related to the embedded fixing parts in the limit tooling. Utility Model Content

[0006] In view of the deficiencies of the prior art, the present utility model provides a pre-embedded positioning tooling for the ballastless track base plate based on a groove support, including a limit groove and a support. The limit groove and the support have a longitudinal beam, a positioning cross beam is connected to the longitudinal beam, and a pre-embedded part is vertically suspended on the positioning cross beam. The pre-embedded part is placed in the casting space S of the base plate, and the top surface of the pre-embedded part is not higher than the top surface of the casting space.

[0007] Further, the pre-embedded part is a pre-embedded sleeve. The longitudinal beam is vertically connected with a screw rod. After the pre-embedded sleeve and the screw rod are threadedly sleeved, they extend into the casting space S of the base plate, and the top surface of the casting space is flush with the top surface of the pre-embedded sleeve.

[0008] Further, through holes are opened in the positioning cross beam, and the screw rod passes through the through holes of the positioning cross beam through the cooperation of the nut and is connected to a specified position. The screw rod is fixed to a specified elevation by reversely adjusting the screw rod and the nut.

[0009] Furthermore, reinforcing spiral bars are implanted on the outer peripheral side of the embedded sleeve, and the bottom of the reinforcing spiral bars is fixed to the bottom of the pouring space S of the base plate.

[0010] Furthermore, the embedded part can also be an embedded bolt. The embedded bolt is vertically suspended and connected to the longitudinal beam and penetrates through the longitudinal beam, and is locked with a nut at one end where the embedded bolt penetrates through the longitudinal beam.

[0011] Furthermore, the positioning cross beam is fixedly connected with an angle steel, through holes are formed in the angle steel and the longitudinal beam, and the positioning cross beam and the longitudinal beam are fixedly locked by bolts penetrating through the through holes of the angle steel and the longitudinal beam and cooperating with nuts.

[0012] Furthermore, the positioning cross beam and the longitudinal beam are fixed by welding.

[0013] Furthermore, there are two groups of the positioning cross beams, and two embedded parts are connected to each group.

[0014] Compared with the prior art, the technical solution of the present application has the following beneficial effects: The embedded positioning tooling involved in the present utility model utilizes the limit grooves and brackets in the existing casting and forming tooling for the ballastless track base plate. Since the positions of the limit grooves and brackets relative to the base plate have been determined, therefore, by accurately positioning the positions of the limit grooves and brackets, the planar positions of the positioning cross beam and the embedded parts can be determined. Adjust the elevation of the embedded parts to the specified height according to the setting-out position of the concrete pouring height of the base plate, and the three-dimensional space positioning and installation and fixation of the base plate embedded tooling can be realized. During the pouring process of the base plate, the positions of the embedded parts remain fixed, which can provide fixed force-bearing points for the subsequent limit tooling. The structure design of this embedded positioning tooling is simple and concise. While achieving accurate positioning of the embedded tooling, it can also ensure the stability of the position of the embedded tooling during the pouring process of self-compacting concrete. In addition, the layout position of the embedded parts is adjusted on the top surface of the base plate, which is convenient to realize the limit fixation of the buckling tooling in the form of bolt fixed connection, and at the same time strengthens the structural design of the area adjacent to the embedded holes, avoiding the adverse situation of structural damage to the embedded holes. Description of the Drawings

[0015] Figure 1 : Schematic diagram of the track slab pouring construction;

[0016] Figure 2 : Top view of the structural schematic diagram of the positioning tooling;

[0017] Figure 3 : Cross-sectional view of the positioning tooling in the first embodiment;

[0018] Figure 4 : Cross-sectional view of the positioning tooling in the second embodiment. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] As Figures 2 to 4 shown, a pre-embedded positioning tooling for the ballastless track base plate based on a groove bracket includes a limiting groove and a bracket 2. The limiting groove and the bracket 2 have a longitudinal beam 21. A positioning cross beam 3 is connected to the longitudinal beam 21, and a pre-embedded member 4 is vertically suspended on the positioning cross beam 3. The pre-embedded member 4 is placed in the casting space S of the base plate. The top surface of the pre-embedded member 4 is not lower than the top surface of the casting space. Since the positions of the limiting groove and the bracket 2 relative to the base plate 101 are determined during design and construction, in this embodiment, the longitudinal position of the positioning cross beam 3 on the longitudinal beam 21 can be determined according to the specific position requirements of the pre-embedded member 4, and the vertical position of the depth of the pre-embedded member 4 extending into the casting space S of the base plate can be determined according to actual requirements. Since the positions between the pre-embedded member 4 and the positioning cross beam 3 are determined and fixed, the position of the pre-embedded member 4 will be determined during the casting process. To facilitate subsequent connection and fixation of the limiting tooling, the top surface of the pre-embedded member 4 is not higher than the top surface of the casting space. Specifically, the pre-embedded member can be flush with the top surface or slightly lower by 2-3 mm.

[0021] One implementation is as Figure 3 shown, the pre-embedded member 4 is a pre-embedded sleeve 41. The longitudinal beam 21 is vertically connected with a screw 42. The pre-embedded sleeve 41 and the screw 42 are threadedly sleeved and extend into the casting space S of the base plate. The top surface of the casting space is flush with the top surface of the pre-embedded sleeve 41. The pre-embedded sleeve 41 determines its position relative to the positioning cross beam 3 through the screw 42. After casting is completed, the pre-embedded sleeve 41 is left inside the base plate 101, and the screw 42 can be unscrewed and removed. The top surface of the pre-embedded sleeve 41 is flush with the top surface of the casting space of the base plate. On the one hand, it is to make the unscrewing and removal of the screw 42 smoother. On the other hand, it is to keep the top surface flush after the base plate 101 is cast, eliminating the need for subsequent cutting work and reducing the on-site construction workload.

[0022] In this embodiment, the fixing method between the screw 42 and the positioning cross beam 3 can be that the positioning cross beam 3 is provided with a through hole and fixedly connected with a nut 211. The screw 42 is connected through the nut 211 and penetrates through the positioning cross beam 3 and is fixed.

[0023] Reinforcing spiral bars 5 are implanted on the outer peripheral side of the embedded sleeve 41, and the bottom of the reinforcing spiral bars 5 is fixed to the bottom of the casting space S of the base plate. When casting the base plate 101, the reinforcing spiral bars 5 can prevent stress concentration on the embedded sleeve 41 during the concrete grouting process and the solidification process, resulting in its position deviation, and further improving the positioning accuracy of the embedded part 4.

[0024] Another implementation mode is as Figure 4 shown. The embedded part 4 is an embedded bolt 43. The embedded bolt 43 is vertically and suspensively connected to the longitudinal beam 21 and penetrates through the longitudinal beam 21, and is locked with a nut at one end where the embedded bolt 43 penetrates through the longitudinal beam 21. The embedded bolt 43 can also be used as an embedded part to provide a fixed force-bearing point for the limit tooling. However, it has certain defects compared with the above implementation mode. The embedded bolt 43 is bound to protrude from the top surface of the casting space S of the base plate. After casting is completed, the base plate 101 will not be a flat surface. After the subsequent track slab 1 is cast and the limit tooling 102 is removed, the protruding embedded bolt 43 needs to be cut, increasing the workload of on-site construction.

[0025] The fixing method between the positioning cross beam 3 and the longitudinal beam 21 adopts a detachable fixing method. Specifically, the positioning cross beam 3 is fixedly connected to the angle steel 31. Through holes are provided in the angle steel 31 and the longitudinal beam 21. The positioning cross beam 3 is fixedly locked through the angle steel 31 and bolts passing through the through holes and in cooperation with nuts. The angle steel 31 and the positioning cross beam 3 can be fixedly welded. In this way, relative to the longitudinal beam 21, this positioning tooling can be disassembled as an independent component and installed when needed, greatly improving the applicability of this utility model patent and the feasibility of application and promotion.

[0026] Alternatively, this positioning tooling and the longitudinal beam 21 can also be regarded as a whole, that is, the positioning cross beam 3 and the longitudinal beam 21 are fixedly welded.

[0027] In order to meet the positioning and fixing requirements of the limit tooling, there are two groups of the positioning cross beam 3, and two embedded parts 4 are connected to each group.

[0028] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0029] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A ballastless track base plate pre-embedded positioning tool based on a groove bracket, comprising a limiting groove and a bracket (2), the limiting groove and the bracket (2) having a longitudinal beam (21), characterized in that: A positioning crossbeam (3) is connected to the longitudinal beam (21), and an embedded part (4) is suspended and connected to the positioning crossbeam (3), wherein the embedded part (4) is placed in a casting space (S) of the base plate, and the top surface of the embedded part (4) is not lower than the top surface of the casting space; The embedded part (4) is an embedded sleeve (41), the longitudinal beam (21) is suspended and connected to a screw rod (42), the embedded sleeve (41) and the screw rod (42) are threadedly sleeved and extend into the casting space (S) of the base plate, and the top surface of the casting space is flush with the top surface of the embedded sleeve (41).

2. The pre-embedded positioning tool for the ballastless track base plate based on the groove bracket according to claim 1, characterized in that: The positioning crossbeam (3) is provided with a through hole and is fixedly connected to a nut (211); the screw rod (42) is connected through the nut (211) and penetrates the positioning crossbeam (3) and is fixed.

3. The pre-embedded positioning tool for the ballastless track base plate based on the groove bracket according to claim 2, characterized in that: A reinforcing spiral rib (5) is implanted on the outer peripheral side of the embedded sleeve (41), and the bottom of the reinforcing spiral rib (5) is fixed to the bottom of the base plate casting space (S).

4. The pre-embedded positioning tool for the ballastless track base plate based on the groove bracket according to claim 3, characterized in that: The positioning crossbeam (3) is fixedly connected to the angle steel (31); the angle steel (31) and the longitudinal beam (21) are provided with through holes; the positioning crossbeam (3) and the longitudinal beam (21) are fixedly locked by bolts penetrating the through holes of the angle steel (31) and the longitudinal beam (21) and matched with nuts.

5. The pre-embedded positioning tool for the ballastless track base plate based on the groove bracket according to claim 3, characterized in that: The positioning crossbeam (3) is fixed to the angle steel (31) by welding.

6. The pre-embedded positioning tool for the ballastless track base plate based on the groove bracket according to claim 1, characterized in that: The positioning crossbeam (3) has two groups, and each group is connected to two embedded parts (4).

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