Trapezoidal sleeper system with preassembled limiting frame

Abstract

The utility model discloses a trapezoid sleeper system with a preassembled limiting frame, the system comprises a novel trapezoid sleeper and the preassembled limiting frame, the preassembled limiting frame is formed by prefabricating reinforced concrete, and the novel trapezoid sleeper cancels a traditional limiting boss and a buffer pad pasted on the outer side of the original limiting boss and the outer side of a longitudinal beam. Left and right outer side blocking shoulders of the ballast bed are correspondingly canceled; the connecting steel pipes are wrapped with concrete blocks, and buffering pads are pasted on the concrete blocks and the inner sides of the adjacent longitudinal beams. The prefabricated limiting frames are located at the ends of the trapezoidal sleepers, specifically located on the inner sides of the two longitudinal beams and also located between the outer wrapped concrete cross beams of the two trapezoidal sleepers, and therefore the novel trapezoidal sleepers are limited through the prefabricated limiting frames. In the construction process, the limiting frames and the trapezoidal sleepers are pre-assembled into a whole, the limiting frames have the mold effect during cast-in-place, concrete is cast in the limiting frames at the ends of the trapezoidal sleepers, the limiting frames and the ballast bed are cast into a whole, and the limiting piers are formed.

Description

Technical Field

[0001] This utility model belongs to the field of rail transit technology, specifically relating to a trapezoidal sleeper system with a pre-installed limiting frame. Background Technology

[0002] Traditional trapezoidal sleeper track beds are L-shaped, such as... Figure 1 As shown, during track bed pouring, the outer sides of the trapezoidal sleepers are prone to hard-on-hard contact problems. Furthermore, the contact area between the outer side of the sleeper and the track bed is relatively concealed, making it difficult to detect the quality of the concrete pouring with the naked eye. Small-radius curves are prone to quality issues such as the vibration damping pads being suspended unnecessarily. When the isolation material at the bottom of the outer sleepers deforms or falls off due to improper handling, the poured concrete will experience hard-on-hard contact with the bottom of the outer sides, such as... Figure 2 As shown in the figure, inspection and maintenance at this location are quite difficult; if such problems are not addressed in a timely manner, they will affect the smoothness and vibration reduction performance of the trapezoidal sleeper track.

[0003] Traditional trapezoidal sleepers feature limiting bosses on the outer side of the longitudinal beams, increasing the maximum width of the sleeper. The track of a traditional trapezoidal sleeper utilizes the restraining effect of these bosses on the longitudinal beams to achieve lateral restraint, requiring the bosses to have a certain lateral load-bearing capacity, thus necessitating their thickness. Due to these two factors, trapezoidal sleeper tracks are wider, occupying more space in the track area and requiring a relatively larger amount of reinforced concrete.

[0004] Therefore, in order to effectively improve the quality of the trapezoidal sleeper system, while saving materials and reducing costs, and improving construction efficiency, the inventors have developed a trapezoidal sleeper system with a pre-installed limiting frame after long-term research and experimentation. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, the inventors have conducted in-depth research and designed a trapezoidal sleeper system with a pre-installed limiting frame. This system includes a novel trapezoidal sleeper and a pre-fabricated limiting frame, which is made of reinforced concrete. The novel trapezoidal sleeper eliminates the traditional limiting boss and the buffer pads attached to the outside of the original limiting boss and longitudinal beams, and also eliminates the left and right outer side shoulders. This avoids water accumulation at the bottom of the inner side of the track bed on small-radius curves and reduces the width of the track bed, thus reducing the use of materials and track space. Concrete blocks are wrapped around the connecting steel pipes, and buffer pads are attached to the concrete blocks and the inner sides of adjacent longitudinal beams. The pre-fabricated limiting frame is located at the end of the trapezoidal sleeper, specifically inside the two longitudinal beams and between the outer concrete crossbeams of the two trapezoidal sleepers, thereby using the pre-fabricated limiting frame to limit the movement of the novel trapezoidal sleeper. During construction, the limiting frame and the trapezoidal sleeper are pre-assembled into one unit. The limiting frame also serves as a mold during on-site pouring. Concrete is poured from the limiting frame at the end of the trapezoidal sleeper. The limiting frame and the track bed are poured together to form a limiting pier; thus completing this utility model.

[0006] Specifically, the purpose of this utility model is to provide a trapezoidal sleeper system with a pre-installed limiting frame, the system including a new trapezoidal sleeper 1 and a pre-made limiting frame 2;

[0007] The novel trapezoidal sleeper 1 includes two longitudinal beams 3 extending along the length of the rail, with at least three connecting steel pipes 4 between the two longitudinal beams 3. Two connecting steel pipes 4 near the ends of the longitudinal beams 3 are encased in concrete blocks, thus forming an outer concrete crossbeam 5.

[0008] Longitudinal buffer pads 6 are attached to the outer concrete beam 5.

[0009] A transverse buffer pad 7 is pasted on the inner side of the longitudinal beam 3 between the concrete crossbeam 5 and the end of the longitudinal beam 3.

[0010] The prefabricated limiting frame 2 and the track bed below the longitudinal beam 3 are cast as an integral structure;

[0011] The prefabricated limiting frame 2 simultaneously abuts against the longitudinal buffer pad 6 and the transverse buffer pad 7;

[0012] The prefabricated limiting frame 2 abuts against the longitudinal buffer pad 6 to provide longitudinal restraint for the longitudinal beam 3;

[0013] The prefabricated limiting frame 2 abuts against the transverse buffer pad 7 to provide lateral restraint for the longitudinal beam 3.

[0014] Among them, the dimensions and shapes of any cross-section of the longitudinal beam 3 perpendicular to its length direction are consistent; that is, no limiting boss or buffer pad is provided on the outer side of the longitudinal beam 3.

[0015] The outer concrete beam 5 includes multiple concrete blocks 51, and expansion joints 52 are reserved between adjacent concrete blocks 51 and between concrete blocks 51 and longitudinal beam 3.

[0016] Preferably, the expansion joint is filled with a filler adhesive.

[0017] The bottom surface of the outer concrete beam 5 is adjacent to and smoothly transitions to the bottom surface of the longitudinal beam 3.

[0018] When the longitudinal beam 3 is prefabricated and transported to the construction site, vibration damping pads are laid at its bottom. In areas without vibration damping pads, isolation materials are pasted at the bottom of the longitudinal beam 3 and the outer concrete beam 5.

[0019] The upper surface structure of the track bed 8 obtained by casting is adjusted by pre-setting the thickness of the isolation material. This upper surface structure causes the water on the track bed 8 to flow to the side drainage ditches 81 on both sides. The side drainage ditches 81 are opened on the track bed 8 and located on both sides of the longitudinal beam 3.

[0020] Preferably, on the track bed 8 that constitutes the straight section of the track, the track bed 8 includes two types: the track bed section with vibration damping pads on top is called the load-bearing section, and the track bed section with a gap between the top and the longitudinal beam 3 is called the unloaded section; the upper surface of the load-bearing section of the track bed 8 is a horizontal structure; the upper surface of the unloaded section of the track bed 8 is an arched structure with a high middle and low sides.

[0021] On the track bed 8 that forms the curve segment of the track, the upper surface of the track bed 8 has a single slope structure, that is, the outer side of the curve is higher than the inner side of the curve.

[0022] The prefabricated limiting frame 2 includes a square concrete frame 21, with a sleeve 22 for temporary fixing on the upper part of the concrete frame 21, and an anchor bar 23 that can be cast integrally with the track bed 8 below the concrete frame 21.

[0023] Among them, a limiting pier 24 is formed by pouring concrete inside the concrete frame 21, and the limiting pier 24 is integrally cast with the track bed 8.

[0024] The prefabricated limiting frame 2 is divided into an integral limiting frame and a separate limiting frame;

[0025] The longitudinal width of the integral limiting frame is the same as the distance between two adjacent longitudinal buffer pads 6 on the two adjacent longitudinal beams 3; the transverse width of the integral limiting frame is the same as the distance between the opposite transverse buffer pads 7 on the longitudinal beams 3.

[0026] The longitudinal width of the split limiting frame is the same as the distance from the end of the longitudinal beam to the adjacent longitudinal buffer pad 6; the transverse width of the opposite limiting frame is the same as the distance from the opposite transverse buffer pad 7 on the longitudinal beam 3.

[0027] The lateral direction is perpendicular to the length of the longitudinal beam, and the longitudinal direction is the length of the longitudinal beam.

[0028] The beneficial effects of this utility model include:

[0029] (1) The trapezoidal sleeper system with pre-installed limiting frame and its construction method provided by this utility model reduce the difficulty of casting and reduce the probability of hard collision between the sleeper side and the sleeper seam;

[0030] (2) The trapezoidal sleeper system with pre-installed limit frame and its construction method provided by this utility model have a simple structure, are easy to inspect and maintain, and the inner and outer sides of the trapezoidal sleeper can be fully observed with the naked eye. If there is a problem of the vibration damping pad being suspended, it can be dealt with in a timely and convenient manner.

[0031] (3) The trapezoidal sleeper system with pre-installed limiting frame and its construction method provided by this utility model can flexibly adjust the structure of the top surface of the track bed, and there is no side baffle, which solves the problem of water accumulation on the inner side of the track curve of the trapezoidal sleeper.

[0032] (4) The trapezoidal sleeper system with pre-installed limiting frame and its construction method provided by this utility model eliminates the wrapping sleeve, reduces the amount of isolation material on both sides, eliminates the outer baffle, reduces the width of the track bed, saves track area space, reduces the amount of track bed concrete, steel bars and molds, and greatly reduces production costs. Attached Figure Description

[0033] Figure 1 This shows the as-built drawing of a traditional trapezoidal sleeper;

[0034] Figure 2 A schematic diagram showing the hard-on-hard contact phenomenon on the inner side of a traditional trapezoidal sleeper;

[0035] Figure 3 The installation diagram of the trapezoidal sleeper with pre-installed limit frame is shown;

[0036] Figure 4 This diagram shows a prefabricated integral limiting block diagram;

[0037] Figure 5 This diagram illustrates the functional position of the prefabricated integral limiting frame.

[0038] Figure 6 This diagram illustrates the functional position of the prefabricated detachable limiting frame.

[0039] Figure 7 This diagram shows the pre-assembled prefabricated integral limiting frame.

[0040] Figure 8 Installation diagram of prefabricated integral limiting frame shown

[0041] Figure 9 Showing the track bed plan;

[0042] Figure 10 The cross-sectional view of the AA track bed is shown;

[0043] Figure 11 The cross-sectional view of the BB track bed is shown;

[0044] Figure 12 The cross-sectional view of the CC track bed is shown;

[0045] Figure 13 The as-built drawing of the sleeper system with a prefabricated integral limiting frame is shown.

[0046] Figure 14 The as-built drawing of the sleeper system with prefabricated detachable limiting frame is shown.

[0047] Figure 15 A schematic diagram of the drainage system for a new type of trapezoidal sleeper curved track section is shown.

[0048] Explanation of icon numbers:

[0049] 1-New type of trapezoidal sleeper

[0050] 2-Prefabricated limiting frame

[0051] 21-Concrete frame

[0052] 22-Casing

[0053] 23-Anchor bar

[0054] 24-Limiting Pier

[0055] 3-Longitudinal Beam

[0056] 4-Connecting steel pipe

[0057] 5-External concrete beam

[0058] 51-Concrete Block

[0059] 52-Expansion Joint

[0060] 6-Longitudinal buffer pad

[0061] 7- Lateral cushioning pad

[0062] 8-track bed

[0063] 81-Side Ditch

[0064] 9-Limit frame temporary fixing fixture

[0065] 91-Square steel pipe

[0066] 92-bolt

[0067] 10-stop

[0068] 11-Limiting boss

[0069] 12-Insulation Material

[0070] 13-Central Drainage Ditch

[0071] 14-Cover plate

[0072] 15-Hard-on Area Detailed Implementation

[0073] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent. While various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0074] This utility model provides a trapezoidal sleeper system with a pre-installed limiting frame. The system includes a novel trapezoidal sleeper 1 and a pre-fabricated limiting frame 2, as shown below. Figure 3 , Figure 5and Figure 6 As shown;

[0075] The novel trapezoidal sleeper 1 includes two longitudinal beams 3 extending along the length of the rail, and at least three connecting steel pipes 4 are provided between the two longitudinal beams 3. The connecting steel pipes 4 and the longitudinal beams 3 are cast into an integral structure; and the multiple connecting steel pipes 4 are evenly distributed.

[0076] like Figure 3 As shown, two connecting steel pipes 4 near the ends of the longitudinal beam 3 are wrapped with concrete blocks to form an outer concrete beam 5. A longitudinal buffer pad 6 is attached to the outer concrete beam 5. A transverse buffer pad 7 is attached between the concrete beam 5 and the ends of the longitudinal beam 3 on the inner side of the longitudinal beam 3.

[0077] Preferably, the prefabricated limiting frame 2 and the track bed below the longitudinal beam 3 are cast as an integral structure;

[0078] The prefabricated limiting frame 2 simultaneously abuts against the longitudinal buffer pad 6 and the transverse buffer pad 7;

[0079] The prefabricated limiting frame 2 abuts against the longitudinal buffer pad 6 to provide longitudinal restraint for the longitudinal beam 3;

[0080] The prefabricated limiting frame 2 abuts against the transverse buffer pad 7 to provide lateral restraint for the longitudinal beam 3.

[0081] In a preferred embodiment, the dimensions and shape of any cross-section perpendicular to the length direction of the longitudinal beam 3 remain consistent; that is, no limiting boss or buffer pad is provided on the outer side of the longitudinal beam 3. The absence of limiting bosses on the longitudinal beam not only saves on the production cost of the longitudinal beam and the space of the track area, but also eliminates the need for lateral supports on the track bed, simplifies the casting process, eliminates empty suspension and hard collisions, and further saves materials and costs.

[0082] In a preferred embodiment, the outer concrete beam 5 includes multiple concrete blocks 51, with expansion joints reserved between adjacent concrete blocks 51 and between the concrete blocks 51 and the longitudinal beam 3; two outer concrete beams 5 are provided on each new trapezoidal sleeper.

[0083] Preferably, the expansion joint is filled with a filler adhesive. Preferably, the width of the expansion joint is set to 1-2 cm.

[0084] By setting the aforementioned expansion joints, this application can retain a certain amount of expansion and contraction space, preventing cracks from forming in the concrete beam under thermal expansion and contraction. More importantly, when the outer concrete beam acts as a longitudinal restraint, i.e., bears the longitudinal load, a certain deformation will occur at the connection node between the concrete beam and the longitudinal beam. Setting expansion joints can prevent the concrete block from cracking under large strain. At the same time, it can also prevent cracking of the concrete surface when the longitudinal beams on both sides undergo relative torsional displacement.

[0085] In a preferred embodiment, the bottom surface of the outer concrete beam 5 is adjacent to and smoothly transitions to the bottom surface of the longitudinal beam 3; that is, there is no height difference between them, and the isolation material can be laid uniformly.

[0086] When the longitudinal beam 3 is prefabricated and transported to the construction site, its bottom is covered with vibration damping pads; at the bottom of the longitudinal beam 3 and the outer concrete beam 5, in areas without vibration damping pads, isolation material 12 is affixed, such as... Figure 3 As shown in the diagram. The insulating material 12 can be applied using only glue or tape.

[0087] Preferably, the upper surface structure of the track bed 8 obtained by casting is adjusted by pre-setting the thickness of the isolation material, and this upper surface structure facilitates the drainage of water on the track bed 8 to the side drainage ditches 81 on both sides; the side drainage ditches 81 are opened on the track bed 8 and located on both sides of the longitudinal beam 3, such as... Figure 8 As shown;

[0088] Preferably, on the track bed 8 that forms the straight section of the track, the track bed 8 includes two types: the track bed section with vibration damping pads on top is called the load-bearing section, and the track bed section with a gap between the top and the longitudinal beams 3 is called the unloaded section. During the pouring construction, the gap is filled by the isolation material, and the isolation material is removed after the pouring is completed, thus forming the gap; the upper surface of the load-bearing section of the track bed 8 is a horizontal structure, that is, the slope is zero; the upper surface of the unloaded section of the track bed 8 is an arched structure with a high middle and low two sides, and the highest point in the middle is located between the two longitudinal beams.

[0089] On the track bed 8 that forms the curve segment of the track, the upper surface of the track bed 8 has a single-slope structure, that is, the outer side of the curve is higher than the inner side of the curve, such as... Figure 15 As shown.

[0090] Preferably, the inner side of the isolation material adhered to the bottom of the trapezoidal sleeper on the straight section is the same thickness as the vibration damping pad, while the outer side is slightly thicker than the vibration damping pad. This is to set the drainage slope of the track bed under the longitudinal beam, thereby preventing water accumulation on the track bed of the new trapezoidal sleeper. Figure 9 , 10 As shown in 11 and 12.

[0091] In a preferred embodiment, such as Figure 4As shown, the prefabricated limiting frame 2 includes a square concrete frame 21, with a sleeve 22 for temporary fixing provided on the upper part of the concrete frame 21, and an anchor bar 23 that can be cast integrally with the track bed 8 below the concrete frame 21. The limiting frame is a rectangular prefabricated reinforced concrete structure, which is prefabricated in the factory together with the longitudinal beam and transported to the construction site.

[0092] In a preferred embodiment, a limiting pier 24 is formed inside the concrete frame 21 by pouring concrete, and the limiting pier 24 is integrally cast with the track bed 8, such as... Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown in the image.

[0093] In a preferred embodiment, such as Figure 5 and Figure 6 As shown, the prefabricated limiting frame 2 is divided into an integral limiting frame and a separate limiting frame;

[0094] The longitudinal width of the integral limiting frame is the same as the distance between two adjacent longitudinal buffer pads 6 on the two adjacent longitudinal beams 3; the transverse width of the integral limiting frame is the same as the distance between the opposite transverse buffer pads 7 on the longitudinal beams 3.

[0095] The longitudinal width of the split limiting frame is the same as the distance from the end of the longitudinal beam to the adjacent longitudinal buffer pad 6; the transverse width of the opposite limiting frame is the same as the distance from the opposite transverse buffer pad 7 on the longitudinal beam 3; that is, the prefabricated limiting frame 2 is set at the end of the new trapezoidal sleeper 1.

[0096] The prefabricated limiting frame 2 can theoretically also be set in the middle of the new trapezoidal sleeper, and can also achieve the longitudinal and lateral limiting function of the trapezoidal sleeper. However, the inventors have found that setting the prefabricated limiting frame 2 at the end of the sleeper has a relative advantage:

[0097] Prefabricated limiting frames and limiting blocks are installed at the ends of the sleepers to minimize the insufficient torsional limiting of the trapezoidal sleepers along the track plane caused by construction errors. That is, the rotation angle of 1mm rotation at both ends is very different from that of 1mm rotation in the middle, thereby improving the service life and structural strength of the sleeper system.

[0098] The lateral direction is perpendicular to the length of the longitudinal beam, and the longitudinal direction is the length of the longitudinal beam.

[0099] Preferably, the integral limiting frame is applied to straight sections without structural joints, while the separate limiting frame is applied to sections with structural joints, curved sections, and other track bed connections.

[0100] This utility model also provides a construction method for a trapezoidal sleeper system with a pre-installed limiting frame, the method comprising the following steps:

[0101] Step 1: Apply isolation material to the bottom surface of the longitudinal beam 3 of the trapezoidal sleeper and the lower surface of the outer concrete beam 5;

[0102] The isolation material can be applied using transparent tape or liquid adhesive. This step is to prevent excessive concrete pouring during the construction process, which could cause the track bed concrete to collide hard with the trapezoidal sleeper longitudinal beams.

[0103] Step 2: Using the temporary fixing fixture 9, assemble the prefabricated limiting frame 2 and the new trapezoidal sleeper 1 into one unit, ensuring that the prefabricated limiting frame 2 fits tightly against the longitudinal buffer pad 6 and the transverse buffer pad 7; Figure 7 As shown;

[0104] Step 3: Mark the position of the track bed 8 below the new trapezoidal sleeper 1 with a chalk line, and tie the track bed steel cage;

[0105] Step 4: Transport and install the new trapezoidal sleeper 1 onto the tied track bed steel cage; when lowering the sleeper, pay attention to adjusting the planar position of the new trapezoidal sleeper to ensure that the geometric position of the track meets the error requirements;

[0106] Step 5: Tie the reinforcing bars of the limiting block 24 and tie the reinforcing bars of the limiting block 24 to the track bed reinforcing cage as one unit.

[0107] Step 6: Erect the mold, which includes an end mold, a track bed mold inside the longitudinal beam, and a track bed mold outside the longitudinal beam;

[0108] In this application, since there is no need to leave a central water ditch, the central position of the new trapezoidal sleeper does not need to be erected with a template; the left and right side platforms are eliminated, and only the bottom track bed is retained. Therefore, the side templates are eliminated, and only the templates for the two side water ditches are set, which reduces the amount of molds used and the construction difficulty.

[0109] Step 7: Adjust the state of the new trapezoidal sleeper 1 and the track bed reinforcement cage, and reconfirm that the prefabricated limiting frame 2 is tightly attached to the longitudinal buffer pad 6 and the transverse buffer pad 7; if the attachment is not tight, the temporary fixing fixtures need to be adjusted before pouring to make them tightly attached.

[0110] Step 8: Pour concrete for track bed 8 from the middle, and simultaneously pour limiting pier 24. The top edge of limiting pier 24 is at the same height as the top surface of prefabricated limiting frame 2. When smoothing the track bed below the straight section, set an arched slope.

[0111] Step 9: Remove the mold and temporary fixing fixture 9 of the limiting frame;

[0112] Step 10: Remove the isolation material at the bottom of longitudinal beam 3 and lay the cover plate.

[0113] Preferably, such as Figure 7As shown in the figure, the temporary fixing fixture 9 of the limiting frame includes a square steel pipe 91 and a bolt 92;

[0114] The bolt 92 is simultaneously screwed onto the square steel pipe 91 and the sleeve 22, thereby lifting the prefabricated limiting frame 2. The two ends of the square steel pipe 91 are connected to the longitudinal beam 3. Example

[0115] A 1000-meter-long tunnel track system was laid, using a new type of trapezoidal sleeper with dimensions of 5900×580×185mm. This new trapezoidal sleeper includes, for example... Figure 3 The longitudinal beam shown also includes, for example, the longitudinal beam shown. Figure 4 The prefabricated limiting frame is shown; the track bed is poured under the trapezoidal sleeper; the specific construction method is as follows:

[0116] Step 1: Apply isolation material to the bottom surface of the longitudinal beam 3 of the trapezoidal sleeper and the lower surface of the outer concrete beam 5;

[0117] Step 2: Use the temporary fixing fixture 9 to assemble the prefabricated limiting frame 2 and the new trapezoidal sleeper 1 into one unit, ensuring that the prefabricated limiting frame 2 fits tightly with the longitudinal buffer pad 6 and the transverse buffer pad 7.

[0118] Step 3: Mark the position of the track bed 8 below the new trapezoidal sleeper 1 with a chalk line, and tie the track bed steel cage;

[0119] Step 4: Transport and install the new trapezoidal sleeper 1 onto the tied track bed steel cage;

[0120] Step 5: Tie the reinforcing bars of the limiting block 24 and tie the reinforcing bars of the limiting block 24 to the track bed reinforcing cage as one unit.

[0121] Step 6: Erect the mold, which includes an end mold, a track bed mold inside the longitudinal beam, and a track bed mold outside the longitudinal beam;

[0122] Step 7: Adjust the state of the new trapezoidal sleeper 1 and the track bed reinforcement cage, and reconfirm that the prefabricated limiting frame 2 is tightly fitted with the longitudinal buffer pad 6 and the transverse buffer pad 7.

[0123] Step 8: Pour concrete for track bed 8 from the middle, and simultaneously pour limiting pier 24. The top edge of limiting pier 24 is at the same height as the top surface of prefabricated limiting frame 2.

[0124] Step 9: Remove the mold and temporary fixing fixture 9 of the limiting frame;

[0125] Step 10: Remove the isolation material at the bottom of longitudinal beam 3 and lay the cover plate.

[0126] The laying of the 1000-meter-long tunnel track system was completed without consuming any protective coverings; the amount of insulating material, pearl cotton, used was 29.95m³.3 The track bed width is 2m, and the amount of track bed concrete used is 812.5m³. 3 The amount of steel reinforcement used for the track bed was 96.57 tons, and the amount of molds used was 628 m³. 2 The cover plate usage was 801.6 linear meters. A total of 15 workers participated in the work, with each worker working 120 hours. The completed track system was inspected, and no defects such as hard contact or empty suspension were found.

[0127] Comparative Example

[0128] A 1000-meter-long tunnel track system was laid, using traditional trapezoidal sleepers of model 5900×580×185mm. These trapezoidal sleepers are equipped with limiting bosses, and lateral supports are installed on the track bed beneath them. The specific construction method is as follows:

[0129] (1) Apply isolation material to the bottom surface of the trapezoidal sleeper, the outer surface of the longitudinal beam, and the end face;

[0130] (2) Use a package cover to ensure proper sealing;

[0131] (3) Determine the location of the trapezoidal sleeper track bed and mark it with chalk lines;

[0132] (4) Tie the reinforcing steel bars of the base and the retaining wall;

[0133] (5) Transport and install the trapezoidal sleepers with proper isolation measures onto the track bed reinforcement cage;

[0134] (6) Support molds, including end molds, central water ditch molds, base and platform molds;

[0135] (7) Adjust the track geometry;

[0136] (8) Pour concrete from the side of the trapezoidal sleeper;

[0137] (9) Remove the above molds and lay the drainage ditch covers in the middle and at the ends.

[0138] The completion of the 1000-meter-long tunnel track system installation consumed 167 pairs of protective sheaths and 33.32m³ of insulating pearl cotton. 3 The track bed width is 2.6m, and the amount of track bed concrete used is 910m³. 3 The amount of steel reinforcement used for the track bed was 127.5 tons, and the amount of mold used was 1478 m³. 2 The cover plate usage was 922.68 linear meters. A total of 15 workers participated in the work, with each worker working 140 hours. After inspecting the laid track system, 16 hard-to-hard defects and 1 empty-hanging defect were found. Further defect repair was carried out by 5 workers, with each worker working 7 hours.

[0139] In the embodiment, after the trapezoidal sleeper system with pre-installed limit frame is laid and applied, the interaction between the vibration damping pad and the base can be observed without moving the drainage ditch cover, which greatly reduces the inspection difficulty of the subway operation department and saves inspection time.

[0140] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and serve only an illustrative purpose. Based on this, various substitutions and improvements can be made to the present invention, all of which fall within the protection scope of the present invention.

Claims

1. A ladder tie system with pre-installed limit frame, characterized in that, The system includes a new type of trapezoidal sleeper (1) and a prefabricated limiting frame (2); The new trapezoidal sleeper (1) includes two longitudinal beams (3) extending along the length of the rail, and at least three connecting steel pipes (4) are provided between the two longitudinal beams (3). The two connecting steel pipes (4) near the ends of the longitudinal beams (3) are wrapped with concrete blocks to form an outer concrete crossbeam (5). A longitudinal buffer pad (6) is pasted on the outer concrete beam (5). On the inner side of the longitudinal beam (3), a transverse buffer pad (7) is attached between the concrete crossbeam (5) and the end of the longitudinal beam (3). The prefabricated limiting frame (2) and the track bed below the longitudinal beam (3) are cast as an integral structure; The prefabricated limiting frame (2) simultaneously abuts against the longitudinal buffer pad (6) and the transverse buffer pad (7). The prefabricated limiting frame (2) abuts against the longitudinal buffer pad (6) to provide longitudinal restraint for the longitudinal beam (3); The prefabricated limiting frame (2) abuts against the transverse buffer pad (7) to provide lateral restraint for the longitudinal beam (3).

2. The trapezoidal sleeper system with pre-installed limiting frame according to claim 1, characterized in that, The dimensions and shapes of any cross-section perpendicular to the length direction of the longitudinal beam (3) are consistent; that is, no limiting boss and buffer pad are provided on the outer side of the longitudinal beam (3).

3. The trapezoidal sleeper system with pre-installed limiting frame according to claim 1, characterized in that, The outer concrete beam (5) includes multiple concrete blocks (51), and expansion joints (52) are reserved between adjacent concrete blocks (51) and between the concrete blocks (51) and the longitudinal beam (3).

4. The trapezoidal sleeper system with pre-installed limiting frame according to claim 3, characterized in that, The expansion joint is filled with filler adhesive.

5. The trapezoidal sleeper system with pre-installed limiting frame according to claim 1, characterized in that, The bottom surface of the outer concrete beam (5) is adjacent to and smoothly transitions to the bottom surface of the longitudinal beam (3); When the longitudinal beam (3) is prefabricated and transported to the construction site, vibration damping pads are laid at its bottom; at the bottom of the longitudinal beam (3) and the outer concrete beam (5), isolation materials are pasted in the areas without vibration damping pads.

6. The trapezoidal sleeper system with pre-installed limiting frame according to claim 5, characterized in that, The upper surface structure of the track bed (8) obtained by casting is adjusted by pre-setting the thickness of the isolation material. The upper surface structure causes the water on the track bed (8) to flow to the side ditches (81) on both sides. The side ditches (81) are opened on the track bed (8) and located on both sides of the longitudinal beam (3).

7. The trapezoidal sleeper system with pre-installed limiting frame according to claim 6, characterized in that, On the track bed (8) that forms the straight section of the track, the track bed (8) includes two types: the track bed section with vibration damping pads on the top is called the load-bearing section, and the track bed section with a gap between the top and the longitudinal beam (3) is called the unloaded section; the upper surface of the load-bearing section of the track bed (8) is a horizontal structure; the upper surface of the unloaded section of the track bed (8) is an arched structure with a high middle and low sides. On the track bed (8) that forms the track curve segment, the upper surface of the track bed (8) is a single slope structure, that is, the outer side of the curve is higher than the inner side of the curve.

8. The trapezoidal sleeper system with pre-installed limiting frame according to claim 1, characterized in that, The prefabricated limiting frame (2) includes a square concrete frame (21), with a sleeve (22) for temporary fixing on the upper part of the concrete frame (21), and an anchor bar (23) that can be cast into the track bed (8) below the concrete frame (21).

9. The trapezoidal sleeper system with pre-installed limiting frame according to claim 8, characterized in that, Inside the concrete frame (21), a limiting pier (24) is formed by pouring concrete, and the limiting pier (24) is integrally cast with the track bed (8).

10. The trapezoidal sleeper system with pre-installed limiting frame according to claim 1, characterized in that, The prefabricated limiting frame (2) is divided into an integral limiting frame and a separate limiting frame; The longitudinal width of the integral limiting frame is the same as the distance between the two adjacent longitudinal buffer pads (6) on the two adjacent longitudinal beams (3); the transverse width of the integral limiting frame is the same as the distance between the opposite transverse buffer pads (7) on the longitudinal beams (3). The longitudinal width of the split limiting frame is the same as the distance from the end of the longitudinal beam to the adjacent longitudinal buffer pad (6); the transverse width of the opposite limiting frame is the same as the distance from the opposite transverse buffer pad (7) on the longitudinal beam (3); The lateral direction is perpendicular to the length of the longitudinal beam, and the longitudinal direction is the length of the longitudinal beam.

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