Large adjustment amount ballastless track bed and construction method thereof

Abstract

The present application relates to a kind of large adjustment quantity ballastless bed and its construction method.Existing ballastless track is formed by pouring, when the deformation of foundation exceeds the adjustment capacity of fastener, it needs to be adjusted by special means such as inverted arch cutting, uncovering plate expansion groove, soil digging and forced lowering.The present application includes prefabricated track slab, fine stone concrete adjustment layer and adjustment block;The middle part of prefabricated track slab is provided with vertical opening, and fine stone concrete adjustment layer is located in opening and the bottom of prefabricated track slab;Adjustment block is located on the transverse side of opening, the top of adjustment block is fixed on prefabricated track slab, and the lower part of adjustment block is located between fine stone concrete adjustment layer and prefabricated track slab.The present application adds specially designed adjustment block on the basis of prefabricated track slab, according to the size difference of variable length block in adjustment block, it is divided into different models, it can be replaced in operation process, can greatly improve adjustment capacity, enhance the adaptability of ballastless track to line foundation deformation, reduce foundation disease treatment workload.

Description

Technical Field

[0001] This invention relates to the field of track engineering technology, specifically to a ballastless track bed with large adjustment capacity and its construction method. Background Technology

[0002] Ballastless track has outstanding advantages such as strong integrity, good stability, low structural height, and uniform stiffness distribution. The rail fasteners are directly connected to the integrated track bed, and the track condition and geometry can be maintained for a long time after construction. It can meet the requirements of high-speed operation comfort and high track smoothness, significantly reducing the workload of operation and maintenance, and has been widely used.

[0003] However, once the existing ballastless track is cast, the position of the rails can only be finely adjusted using rail fasteners. When the deformation of the foundation exceeds the adjustment capacity of the fasteners, special methods such as cutting the invert arch, removing the slab to widen the trench, and excavating soil to force a landing are required for adjustment. This involves a large amount of work, is time-consuming, causes significant disruption to operations, and poses high safety risks.

[0004] Therefore, it is necessary to propose a new ballastless track structure to overcome the above-mentioned technical defects. Summary of the Invention

[0005] The purpose of this invention is to provide a large-adjustment ballastless track bed and its construction method to solve the problems of large engineering workload, long time consumption, large disruption to operation, and high safety risks that exist in the current ballastless track structure when adjusting to adapt to foundation deformation.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A large-adjustment ballastless track bed, the ballastless track bed comprising precast track slabs, fine aggregate concrete adjustment layer and adjustment blocks;

[0008] The precast track slab has a vertical opening in the middle, and the fine aggregate concrete adjustment layer is located inside the opening and at the bottom of the precast track slab.

[0009] The adjustment block is located on both sides of the opening, the top of the adjustment block is fixed to the precast track plate, and the lower part of the adjustment block is located between the fine stone concrete adjustment layer and the precast track plate.

[0010] Furthermore, the adjustment block includes a retaining edge, a fixing block, and a variable length block;

[0011] The fixing block is connected to the bottom of the card edge, and the variable length block is connected to the inside of the card edge and the fixing block.

[0012] Furthermore, the longitudinal length of the retaining edge is greater than the longitudinal length of the fixing block, and vertical bolt holes are provided at both ends of the longitudinal direction of the retaining edge;

[0013] Vertical fixing sleeves are pre-set on the top surface of the precast track slab on both sides of the opening. The bolt holes correspond vertically to the fixing sleeves and fixing bolts are screwed in to fix the adjusting block to the precast track slab.

[0014] Furthermore, the top surface of the prefabricated track plate on both sides of the opening is provided with mounting grooves, and the fixing block is embedded in the mounting grooves.

[0015] Furthermore, the variable length blocks are divided into different models based on differences in their lateral length.

[0016] Furthermore, the fine aggregate concrete adjustment layer includes a fine aggregate concrete base and a limiting boss on the top of the fine aggregate concrete base.

[0017] The fine aggregate concrete base is located at the bottom of the precast track slab, and the limiting boss is located inside the opening.

[0018] Furthermore, a filling material is provided between the outer periphery of the limiting boss and the inner wall of the opening;

[0019] Both the limiting boss and the filling material have notches at the location of the variable length block.

[0020] Furthermore, an isolation layer is provided between the bottom surface of the precast track slab and the top surface of the fine stone concrete base.

[0021] On the other hand, a construction method for a ballastless track bed with large adjustment range is provided, the method comprising:

[0022] Fix the adjustment blocks to both sides of the opening in the precast track slab;

[0023] The isolation layer and filling material are respectively attached to the bottom of the precast track slab and the inner wall of the opening;

[0024] Position and fix the precast track slab;

[0025] Fine aggregate concrete is poured into the opening to form a fine aggregate concrete adjustment layer, which, after solidification, forms a large-adjustment ballastless track bed.

[0026] Furthermore, when significant planar adjustments to the precast track slab are required, this includes:

[0027] Remove the filling material;

[0028] Remove the fixing bolts to take out the adjusting block;

[0029] Move the precast track slab to the adjustment position and install another type of adjustment block onto the precast track slab;

[0030] Refill with new material.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] This invention provides a large-adjustment ballastless track bed, which adds specially designed adjustment blocks to the precast track slab. These adjustment blocks are available in different models based on the size differences of the variable-length blocks within them, and can be disassembled and replaced during operation to meet the requirements for large-scale adjustments via the track bed. When foundation deformation exceeds the adjustment capacity of the fasteners, the fasteners can be restored to standard parts and adjusted using the ballastless track bed of this invention. This significantly improves the adjustment capacity of the ballastless track, enhances its adaptability to subgrade foundation deformation, and reduces the amount of foundation defect remediation work. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a plan view of the large-adjustment ballastless track bed of the present invention.

[0035] Figure 2 This is a longitudinal section view of the track support platform of the large-adjustment ballastless track bed of the present invention.

[0036] Figure 3 This is a longitudinal section view of the precast track slab with large adjustment capacity of the ballastless track bed according to the present invention.

[0037] Figure 4 This is a cross-sectional view of the end of the large-adjustment ballastless track bed slab of the present invention.

[0038] Figure 5 This is a cross-sectional view of the precast track slab with large adjustment capacity of the ballastless track bed according to the present invention.

[0039] Figure 6 This is a cross-sectional view of the large-adjustment ballastless track adjustment block of the present invention.

[0040] The diagram is labeled as follows:

[0041] 1-Precast track slab, 2-Fine aggregate concrete adjustment layer, 3-Adjustment block, 4-Filling material, 5-Isolation layer, 6-Fixing bolts;

[0042] 11-Rail support platform, 12-Embedded sleeve, 13-Fixed sleeve, 14-Installation groove;

[0043] 21-Limiting boss; 22-Fine aggregate concrete base;

[0044] 31-Edge clamp, 32-Fixed block, 33-Variable length block;

[0045] 311 - Bolt hole. Detailed Implementation

[0046] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0047] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "longitudinal", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In a specific implementation, the direction of the line is defined as longitudinal, the direction perpendicular to the line is defined as transverse, the direction closer to the centerline of the line is defined as inner, and the direction farther from the centerline of the line is defined as outer.

[0050] This invention provides a large-adjustment ballastless track bed, which adds a specially designed adjustment block 3 to the precast track slab 1. When the foundation deformation exceeds the adjustment capacity of the rail fasteners, it can meet the large-range adjustment of the precast track slab 1 in the elevation and horizontal plane.

[0051] like Figure 1-6 The ballastless track bed includes a precast track slab 1, a fine aggregate concrete adjustment layer 2, adjustment blocks 3, filling material 4, and an isolation layer 5.

[0052] The precast track slab 1 is a precast reinforced concrete structure. During the precasting process, a vertical opening is reserved in the middle for pouring fine aggregate concrete. Two rows of rail support platforms 11 are evenly arranged longitudinally on the slab body of the precast track slab 1. Two embedded sleeves 12 are arranged perpendicular to the surface of the rail support platform 11 and connected to the rails by fasteners.

[0053] The fine aggregate concrete adjustment layer 2 is formed by pouring fine aggregate concrete into the opening. It is a cast-in-place structure. After pouring, it is distributed at the bottom of the precast track slab 1 and in the opening. After solidification, it forms a fine aggregate concrete base 22 and a limiting boss 21 on the top of the fine aggregate concrete base 22. The fine aggregate concrete base 22 is located at the bottom of the precast track slab 1, and the limiting boss 21 is located in the opening, which plays a supporting and limiting role for the precast track slab 1.

[0054] Adjusting blocks 3 are located on both sides of the opening. The top of adjusting blocks 3 is fixed to the precast track slab 1, and the lower part of adjusting blocks 3 is located between the fine aggregate concrete adjusting layer 2 and the precast track slab 1. Adjusting blocks 3 include a retaining edge 31, a fixing block 32, and a variable length block 33. They are metal parts and can be integrally formed by molding or manufactured separately and then connected. The fixing block 32 is connected to the bottom of the retaining edge 31, and the variable length block 33 is connected to the inner side of the retaining edge 31 and the fixing block 32. The retaining edge 31 is a strip plate structure, and its longitudinal length is greater than that of the fixing block 32. Vertical bolt holes 311 are provided at both ends of the longitudinal direction of the retaining edge 31. Vertical fixing sleeves 13 are pre-set on the top surface of the precast track slab 1 on both sides of the opening. The bolt holes 311 correspond vertically to the fixing sleeves 13 and the fixing bolts 6 are screwed in to fix the adjusting blocks 3 to the precast track slab 1. The top surface of the prefabricated track slab 1 on both sides of the opening is provided with mounting grooves 14, and the fixing block 32 is embedded in the mounting grooves 14.

[0055] The variable length block 33 is divided into different models according to the difference in its lateral degree, corresponding to different models of adjustment block 3. The difference in the lateral length of the variable length block 33 is matched with the maximum adjustment capacity of the fastening system. The plane position of the precast track slab 1 can be adjusted by replacing different models of adjustment block 3.

[0056] A filling material 4 is provided between the outer periphery of the limiting boss 21 and the inner wall of the opening. The filling material 4 is adhered to the inner side wall of the opening of the precast track slab 1. The filling material 4 can be foam board or other rigid, lightweight structural materials. Alternatively, the limiting boss 21 can be formed using a steel template first, and then resin, polymer cement, or other liquid materials with a certain degree of flexibility can be injected between the precast track slab 1 and the limiting boss 21. Notches are provided at the positions of the limiting boss 21 and the filling material 4, respectively. An isolation layer 5 is provided between the bottom surface of the precast track slab 1 and the top surface of the fine stone concrete base 22, and can be made of PE film or geotextile. The filling material 4 and the isolation layer 5 serve to isolate the precast track slab 1 from the fine stone concrete base 22 and the limiting boss 21, facilitating elevation or plane adjustment after the precast track slab 1 is separated from the fine stone concrete. During elevation adjustment, the slab can be lifted vertically, and then quick-setting materials such as resin mortar or polymer mortar can be filled under the slab.

[0057] The above-mentioned construction methods for large-scale ballastless track bed adjustments include:

[0058] S1: Fix the adjusting block 3 on both sides of the opening in the precast track slab 1;

[0059] S2: Adhere the isolation layer 5 and the filling material 4 to the bottom of the precast track slab 1 and the inner wall of the opening, respectively;

[0060] S3: Position and fix the precast track slab 1;

[0061] S4: Fine aggregate concrete is poured into the opening to form fine aggregate concrete adjustment layer 2, which, after solidification, forms a large-adjustment ballastless track bed.

[0062] Depending on the type of filling material 4, the above construction methods are divided into two types:

[0063] Example 1:

[0064] When the filling material 4 is foam board or other rigid and lightweight structural materials, first install the adjustment block 3 on the precast track slab 1, and then attach the filling material 4 and the isolation layer 5 to the bottom of the precast track slab 1 and the inner wall of the opening, respectively. Then position and fix the precast track slab 1, pour the fine stone concrete adjustment layer 2 into the opening, and form a large adjustment amount ballastless track bed after solidification.

[0065] Example 2:

[0066] When the filling material is a liquid material that has a certain degree of flexibility after solidification, the adjustment block 3 is first installed on the precast track slab 1, and the isolation layer 5 is pasted on the bottom of the precast track slab 1. Then, the precast track slab 1 is positioned and fixed. A template of a certain thickness is installed on the inner side wall of the opening. Then, fine stone concrete adjustment layer 2 is poured into the opening. After solidification, a large adjustment amount ballastless track bed is formed. Finally, resin, polymer cement or other liquid material that has a certain degree of flexibility after solidification is injected between the precast track slab 1 and the limiting boss 21.

[0067] When the foundation deformation exceeds the adjustment capacity of the rail fasteners, the rail fasteners can be restored to standard parts and adjusted using the ballastless track bed of this invention. When a significant planar adjustment of the precast track slab 1 is required, the following operations can be performed:

[0068] Step 1: Remove filler material 4;

[0069] Step 2: Remove the fixing bolt 6 to take out the adjusting block 3;

[0070] Step 3: Adjust the precast track slab 1 according to the fine-tuning results and temporarily fix it, and install another type of adjustment block 3 onto the precast track slab 1;

[0071] Step 4: Fill the gaps with polymer mortar or other materials with rapid setting and early strength, restore the filling material 4, and fine-tune the track geometry.

[0072] If the deformation of the foundation exceeds the adjustment capacity of the rail fasteners again, the above steps can be repeated to complete the adjustment.

[0073] The large-adjustment ballastless track bed of this invention has lateral adjustment capability. The adjustment blocks are divided into different models based on the size differences of the variable-length blocks, and can be disassembled and replaced during operation. The large-adjustment ballastless track bed of this invention also has elevation (vertical) adjustment capability, achieved by lifting the slab (with an isolation layer between the slab and the fine aggregate concrete layer) and filling the space under the slab with a quick-setting material. This can meet the adjustment requirements for large adjustments, significantly improve the adjustment capability of ballastless track, enhance the adaptability of ballastless track to subgrade deformation, and reduce the amount of engineering work required for foundation defect repair.

[0074] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A large-adjustment ballastless track bed, characterized in that: The ballastless track bed includes a precast track slab (1), a fine stone concrete adjustment layer (2), and adjustment blocks (3); The precast track slab (1) has a vertical opening in the middle, and the fine stone concrete adjustment layer (2) is located inside the opening and at the bottom of the precast track slab (1). The adjustment block (3) is located on both sides of the opening. The top of the adjustment block (3) is fixed on the precast track plate (1). The lower part of the adjustment block (3) is located between the fine stone concrete adjustment layer (2) and the precast track plate (1). The adjustment block (3) includes a retaining edge (31), a fixing block (32), and a variable length block (33); The fixing block (32) is connected to the bottom of the card edge (31), and the variable length block (33) is connected to the inside of the card edge (31) and the fixing block (32); The longitudinal length of the retaining edge (31) is greater than the longitudinal length of the fixing block (32), and vertical bolt holes (311) are provided at both ends of the longitudinal direction of the retaining edge (31). The top surface of the prefabricated track plate (1) on both sides of the opening is provided with a vertical fixing sleeve (13). The bolt hole (311) corresponds to the fixing sleeve (13) and the fixing bolt (6) is screwed in to fix the adjusting block (3) to the prefabricated track plate (1). The top surface of the prefabricated track plate (1) on both sides of the opening is provided with an installation groove (14), and the fixing block (32) is embedded in the installation groove (14). The variable length block (33) is divided into different models according to the difference in lateral length.

2. The large-adjustment ballastless track bed according to claim 1, characterized in that: The fine stone concrete adjustment layer (2) includes a fine stone concrete base (22) and a limiting boss (21) on the top of the fine stone concrete base (22). The fine stone concrete base (22) is located at the bottom of the precast track slab (1), and the limiting boss (21) is located inside the opening.

3. The large-adjustment ballastless track bed according to claim 2, characterized in that: A filling material (4) is provided between the outer periphery of the limiting boss (21) and the inner wall of the opening. The limiting boss (21) and the filling material (4) are both provided with notches at the position of the variable length block (33).

4. The large-adjustment ballastless track bed according to claim 3, characterized in that: An isolation layer (5) is provided between the bottom surface of the precast track slab (1) and the top surface of the fine stone concrete base (22).

5. The construction method for a large-adjustment ballastless track bed according to claim 3, characterized in that: The method includes: Fix the adjusting block (3) on both sides of the opening in the precast track slab (1); The isolation layer (5) and the filling material (4) are respectively pasted on the bottom of the precast track slab (1) and the inner wall of the opening; Position and fix the precast track slab (1); Fine stone concrete is poured into the opening to form a fine stone concrete adjustment layer (2), which, after solidification, forms a large-adjustment ballastless track bed.

6. The construction method for a large-adjustment ballastless track bed according to claim 5, characterized in that: When a significant planar adjustment is required for the precast track slab (1), it includes: Remove the filling material (4); Remove the fixing bolt (6) to take out the adjusting block (3); Move the precast track slab (1) to the adjustment position and install another type of adjustment block (3) onto the precast track slab (1); (4) Refill with new filling material.

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