Construction technology of limiting piles for ballastless track base slab

Abstract

The present invention provides a construction process for the base plate limit piles of a ballastless track, belonging to the technical field of track construction. The technical solution is as follows: The base plate limit pile includes a foundation and a pair of circular bodies arranged on the foundation. The foundation is a square body. The construction process specifically includes subgrade section treatment, excavation of the limit pile foundation trench, and pouring and curing of the foundation and the circular bodies. The beneficial effects of the present invention are as follows: This construction process effectively guarantees the construction quality and improves the construction efficiency. In particular, the limiting device has the advantages of simple structure, easy operation, and low cost, and is applicable to construction structures with small structural dimensions and difficult precision control, such as small structural objects like limit piles, bearing pads, and retaining blocks that require high elevation and position precision.

Description

Technical Field

[0001] The present invention relates to the technical field of track construction, and in particular to a construction process for the limiting piles of the base slab of a ballastless track. Background Art

[0002] At present, the country is vigorously developing green prefabricated construction. The newly built passenger railways basically adopt the ballastless track structure of CRTS III-type slabs. The freight railways are still in the development stage of ballasted railways. With the advocacy of the national idea of transferring goods transportation from road to rail, developing a new type of freight ballastless track structure has become a trend.

[0003] With the vigorous development of the prefabricated structure, the application of ballastless tracks in the construction of freight railways has begun to be explored. The construction of the new type of prefabricated freight railway limiting device has become a key and difficult point due to the extremely high precision requirements. Therefore, there is a need to invent a construction process and a construction method for the base slab limiting piles. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction process for the limiting piles of the base slab of a ballastless track that is simple to operate and ensures the construction accuracy and quality.

[0005] The present invention is achieved by the following measures:

[0006] A construction process for the limiting piles of the base slab of a ballastless track, characterized in that the base slab limiting piles include a foundation and a pair of circular bodies arranged on the foundation. The foundation is a square body. The specific construction process is as follows:

[0007] S1. Subgrade section treatment: Treat the subgrade section with lime-mixed graded crushed stone and asphalt seal layer;

[0008] S2. Excavate the limiting pile foundation groove: After the lime-mixed graded crushed stone is completed with rolling and compaction and passes the inspection, excavate the limiting pile foundation groove corresponding to the foundation on the subgrade section. When excavating, first use a hydraulic disc saw to cut out a square frame corresponding to the foundation, and then use a small excavator to break the cut body;

[0009] S3. Pour the foundation and the circular bodies:

[0010] Since the base slab limiting piles are arranged with two circular bodies inserted into the base slab horizontally, the horizontal center distance between the two circular bodies on both sides is 1.35 m, the vertical distance is 1.99 m, and the size of the foundation is 0.8 m × 0.8 m, the adopted scheme is: excavate a horizontal through groove, pour the through groove, and use plain concrete for pouring in the non-reinforced section;

[0011] S4. Cure the base slab limiting piles. After the curing is completed, within the laying range of the base slab, lay a similar mortar material (micro-surfacing material) with a thickness slightly greater than 10 mm, and spread and level it manually.

[0012] Specific features of the present invention also include:

[0013] The specific method for the S2 to excavate the limited-position pile foundation groove is as follows:

[0014] Since the disc saw cannot cut 40 cm at one time, and the over-seam around the groove opening during one-time cutting is too large, resulting in a large amount of later repair work, it is proposed to carry out the cutting in batches according to the construction situation of the lime-fly ash macadam compacted in layers:

[0015] For the first time, after the lower layer of lime-fly ash macadam is completed and compacted, cut according to the size of the foundation, but do not break and clean it, and continue to be used as the paving and compaction support surface for the upper layer of filler;

[0016] For the second time, after the asphalt surface is accepted as qualified, carry out secondary cutting. The cutting size is slightly larger than the size of the foundation in the longitudinal and transverse directions by 1-2 cm to ensure that the cutting joint size line does not deviate;

[0017] The specific process requirements of the S3 are as follows:

[0018] Steel bar binding and pouring: Use the limited-position pile foundation groove body as the external formwork, bind the steel bars of the foundation and the cylinder as a whole, and adopt the limiting device of the cylinder to pour the foundation and the cylinder horizontally at one time;

[0019] Elevation requirements: The elevation of the top surface of the foundation is controlled to be equal to the asphalt surface, and the micro-surfacing at the top of the foundation is considered to be processed synchronously when adjusting the layer under the base plate;

[0020] Cylinder setting: The cylinders in the straight section of the line are set perpendicular to the horizontal line, and the cylinders in the curve section of the line with superelevation are set perpendicular to the superelevation line in units of each track slab at each mileage.

[0021] The limiting device includes a pair of fixed rods arranged in parallel, and a number of limiting pile molds are arranged between the two fixed rods on both sides. Fixed mechanisms are arranged at both ends of the fixed rods;

[0022] The limiting pile mold includes a cylinder with both the upper and lower bottom surfaces being open. A number of reinforcing steel plates for the limiting pile mold are arranged on the cylinder. The limiting pile mold can be divided into two halves from the middle, with one half fixed on one side of the fixed rod and the other half fixed on the other side of the fixed rod. Such a structure can facilitate the removal of the mold.

[0023] The fixed mechanism includes a base, and a number of fixing holes are arranged on the base. The base is fixed on the ground through fixing pins arranged in the fixing holes;

[0024] A support mechanism is arranged on the base.

[0025] The support mechanism includes a support block arranged at the end of the fixed rod through nuts and bolts, and a through first threaded hole is arranged on the support block;

[0026] A height control shaft that matches is arranged through the first threaded hole, and a bearing block is rotatably arranged at the lower end of the height control shaft.

[0027] A through second threaded hole is arranged on the bearing block along the length direction of the fixed rod;

[0028] A through third threaded hole is arranged on the bearing block along the width direction of the fixed rod;

[0029] A longitudinal limiting plate corresponding to the second threaded hole is arranged on the base, a first card slot is arranged on the longitudinal limiting plate, and a first bolt is arranged through the first card slot and the second threaded hole for connection and fixation. The position of the limiting device relative to the base in the longitudinal direction can be finely adjusted through the first bolt;

[0030] A transverse limiting plate corresponding to the third threaded hole is arranged on the base, a second card slot is arranged on the transverse limiting plate, and a second bolt is arranged through the second card slot and the third threaded hole for connection and fixation. The position of the limiting device relative to the base in the transverse direction can be finely adjusted through the second bolt.

[0031] A hexagonal column is arranged at one end of the height control shaft away from the bearing block. By rotating the hexagonal column, the height of the height control shaft can be adjusted, so as to adjust the height of the limiting pile mold relative to the ground.

[0032] The limiting device further includes a transport vehicle;

[0033] The transport vehicle includes a bottom plate, vertical rods are arranged on both sides of the bottom plate, sliding grooves are arranged on the opposite side surfaces of the vertical rods on both sides, sliders are arranged in the sliding grooves on both sides, an L-shaped lifting plate is arranged between the sliders on both sides, a pair of electric telescopic rods is arranged on one side of the L-shaped lifting plate, and the free ends of the pair of electric telescopic rods are arranged on the bottom plate;

[0034] A push rod is arranged on one side of the bottom plate.

[0035] A plurality of rollers are arranged under the bottom plate.

[0036] The working principle of the limiting device: First, push the transport vehicle to the lower part of the fixed rod, then raise the electric telescopic rods to lift the L-shaped lifting plate, so that the limiting device leaves the ground, and then transport the limiting device to the construction site through the transport vehicle;

[0037] The construction can fix the fixing pin according to the layout position of the surveyors or fix the limiting device in the form of driving expansion bolts. After fixing, acceptance of concealed works such as structural steel bars and formwork shall be carried out. After the acceptance is completed, the limiting device shall be finely adjusted through the first bolt and the second bolt to ensure the verticality and correct plane position of the cast-in-place limiting entity. After all indicators meet the requirements, concrete pouring shall be carried out. The concrete shall be first poured to the lower part of the limiting pile form. After the initial setting and before the final setting, the concrete in the limiting pile form shall be poured. During the pouring process, the concrete shall be vibrated with a vibrating rod. After the concrete reaches the final setting, it shall be covered for curing. After the concrete strength reaches the level that it will not chip off, the limiting device shall be removed. During the whole pouring process, the vibrating rod shall be avoided from touching the limiting device to ensure the unchanged verticality and plane position of the limiting device.

[0038] The beneficial effects of the present invention are as follows:

[0039] 1. This construction technology effectively guarantees the construction quality of the project, improves the construction efficiency. Especially the application of the limiting device improves the construction accuracy and avoids unnecessary later corrections.

[0040] 2. This limiting device has the advantages of simple structure, convenient operation and low cost, and is applicable to construction structures with small structural dimensions and difficult to control accuracy, such as small structural objects like limiting piles, bearing pads, and retaining blocks that require high elevation and position accuracy.

[0041] 3. This limiting device greatly reduces the work of measuring and repeatedly adjusting the formwork back and forth, improves the measurement work efficiency, ensures the accuracy of measurement data, and this method can be referred to for the construction of structures with high precision requirements.

[0042] 4. This limiting device can be recycled, is economical and durable, and has strong applicability. Description of the Drawings

[0043] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention.

[0044] Figure 2 is Figure 1 the enlarged view of A in

[0045] Figure 3 is the structural schematic diagram of the transport vehicle in the embodiment of the present invention.

[0046] Figure 4 is the schematic diagram of the base plate limiting pile in the embodiment of the present invention.

[0047] Among them, the reference numerals are: 1, fixed rod; 2, limiting pile formwork reinforcement steel plate; 3, limiting pile formwork; 4, hexagonal column; 5, support block; 6, elevation control axis; 7, bearing block; 8, base; 9, second bolt; 10, longitudinal limiting plate; 11, first bolt; 12, transverse limiting plate; 13, bottom plate; 14, L-shaped lifting plate; 15, vertical rod; 16, electric telescopic rod; 17, push rod; 18, subgrade section; 19, circular body; 20, foundation. Detailed implementation manners

[0048] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific implementation manners.

[0049] Embodiment 1

[0050] Refer to Figures 1-4 , a construction process for the limiting piles of the ballastless track base plate. The limiting piles of the base plate include a foundation 20 and a pair of circular bodies 19 arranged on the foundation 20. The foundation 20 is a square body. The specific construction process is as follows:

[0051] S1. Subgrade section treatment: Carry out lime-fly ash graded crushed stone and asphalt seal layer treatment on the subgrade section 18;

[0052] S2. Excavate the limiting pile foundation trench: After the lime-fly ash graded crushed stone is completed with rolling and compaction and passes the inspection, excavate the limiting pile foundation trench corresponding to the foundation 20 on the subgrade section 18. During excavation, first use a hydraulic disc saw to cut out a square frame corresponding to the foundation 20, and then use a small excavator to break the cut body;

[0053] S3. Pour the foundation 20 and the circular body 19: Since the limiting piles of the base plate are arranged with two circular bodies 19 inserted into the base plate horizontally, the horizontal center distance between the two circular bodies 19 on both sides is 1.35 m, the longitudinal distance is 1.99 m, and the size of the foundation 20 is 0.8 m × 0.8 m, the adopted scheme is: excavate the horizontal through groove, pour the through groove, and use plain concrete for pouring in the non-reinforced section;

[0054] S4. Cure the limiting piles of the base plate. After curing, within the laying range of the base plate, lay a similar mortar material (micro-surfacing material) with a thickness slightly greater than 10 mm, and manually spread and level it

[0055] The specific method for excavating the limiting pile foundation trench in S2 is as follows:

[0056] Since the disc saw cannot cut 40 cm at one time, and the one-time cutting has too large a gap around the grooving, resulting in a large amount of later repair work, it is proposed to carry out the cutting in batches according to the layered rolling construction situation of the lime-fly ash graded crushed stone:

[0057] After the first compaction of the lime-treated graded crushed stone in the lower layer, cut it according to the size of the foundation 20, but do not break and clean it. Continue to use it as the paving and compaction support surface for the upper layer filler.

[0058] For the second time, perform secondary cutting after the asphalt surface is accepted. The cutting size is slightly larger than the size of the foundation 20 in the longitudinal and transverse directions by 1 - 2 cm to ensure that the cutting seam size line does not deviate.

[0059] The specific process requirements for S3 are as follows:

[0060] Steel bar binding and pouring: Use the limiting pile foundation trough body as the outer mold, bind the steel bars of the foundation 20 and the cylinder 19 integrally, and adopt the limiting device of the cylinder 19 to pour the foundation 20 and the cylinder 19 horizontally at one time.

[0061] Elevation requirement: The top elevation of the foundation 20 is controlled to be equal to the elevation of the asphalt surface. The micro-surfacing at the top of the foundation 20 is considered to be processed synchronously when adjusting the layer under the base plate.

[0062] Cylinder setting: The cylinders 19 in the straight section of the line are set perpendicular to the horizontal line. For the curve section of the line with superelevation, the cylinders 19 are set perpendicular to the superelevation line for each mileage and each track slab as a unit.

[0063] Embodiment 2

[0064] See Figures 1-3 , the limiting device includes a pair of fixed rods 1 arranged in parallel, and several limiting pile molds 3 are arranged between the two fixed rods 1 on both sides. Fixed mechanisms are arranged at both ends of the fixed rod 1.

[0065] The limiting pile mold 3 includes a cylinder with both the upper and lower bottom surfaces being open. Several reinforcing steel plates 2 for the limiting pile mold are arranged on the cylinder. The limiting pile mold 3 can be divided into two halves from the middle. One half is fixed on one fixed rod 1, and the other half is fixed on the other fixed rod 1. Such a structure can facilitate the removal of the mold.

[0066] The fixed mechanism includes a base 8. Several fixing holes are arranged on the base 8. The base 8 is fixed on the ground through fixing pins arranged in the fixing holes.

[0067] A support mechanism is arranged on the base 8.

[0068] The support mechanism includes a support block 5 arranged at the end of the fixed rod 1 through nuts and bolts. A through first threaded hole is arranged on the support block 5.

[0069] A height control shaft 6 that matches is arranged through the first threaded hole. A bearing block 7 is rotatably arranged at the lower end of the height control shaft 6.

[0070] A through second threaded hole is arranged on the bearing block 7 along the length direction of the fixed rod 1.

[0071] On the bearing block 7, there is a through third threaded hole arranged along the width direction of the fixed rod 1;

[0072] On the base 8, there is a longitudinal limiting plate 10 corresponding to the second threaded hole. On the longitudinal limiting plate 10, there is a first card slot. A first bolt 11 is arranged through the first card slot and the second threaded hole for connection and fixation. Through the first bolt 11, the position of the limiting device relative to the base 8 in the longitudinal direction can be finely adjusted;

[0073] On the base 8, there is a transverse limiting plate 12 corresponding to the third threaded hole. On the transverse limiting plate 12, there is a second card slot. A second bolt 9 is arranged through the second card slot and the third threaded hole for connection and fixation. Through the second bolt 9, the position of the limiting device relative to the base 8 in the transverse direction can be finely adjusted.

[0074] At one end of the elevation control shaft 6 far from the bearing block 7, there is a hexagonal column 4. By rotating the hexagonal column 4, the height of the elevation control shaft 6 can be adjusted so as to adjust the height of the limiting pile form 3 relative to the ground.

[0075] The limiting device further includes a transport vehicle;

[0076] The transport vehicle includes a bottom plate 13. On both sides of the bottom plate 13, there are vertical rods 15. On the opposite sides of the two vertical rods 15, there are sliding grooves. In the two sliding grooves, there are sliders. Between the two sliders, there is an L-shaped lifting plate 14. On one side of the L-shaped lifting plate 14, there is a pair of electric telescopic rods 16. The free ends of the pair of electric telescopic rods 16 are arranged on the bottom plate 13;

[0077] On one side of the bottom plate 13, there is a push rod 17.

[0078] Under the bottom plate 13, there are several rollers.

[0079] The working principle of the limiting device: First, push the transport vehicle to the lower part of the fixed rod 1, then raise the electric telescopic rods 16 to lift the L-shaped lifting plate 14, thereby lifting the limiting device off the ground, and then transport the limiting device to the construction site by the transport vehicle;

[0080] During construction, the limiting device can be fixed in the form of fixing pins or driving expansion bolts according to the position where the surveyors set out the lines. After being fixed, acceptance inspections are carried out on hidden works such as structural steel bars and formworks. After the acceptance is completed, the limiting device is finely adjusted through the first bolt 11 and the second bolt 9 to ensure the verticality and plane position of the cast limiting entity are correct. After all indicators meet the requirements, concrete pouring is carried out. The concrete is first poured to the lower part of the limiting pile form 3. After the initial setting, before the final setting, concrete is poured into the limiting pile form 3. During the pouring process, the concrete is vibrated with a vibrator. After the concrete reaches the final setting, it is covered for curing. After the concrete strength reaches the level where it will not chip off, the limiting device is removed.

[0081] The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated herein. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A construction process for the limiting piles of the ballastless track base plate, characterized in that, The base plate limit pile includes a foundation (20) and a pair of circular bodies (19) arranged on the foundation (20). The foundation (20) is a square body. The construction process is as follows: S1. Subgrade section treatment: Perform lime-stabilized graded crushed stone and asphalt sealing layer treatment on the subgrade section (18); S2. Excavate the limit pile foundation trench: After the lime-stabilized graded crushed stone is completed, rolled and passed the inspection, excavate the limit pile foundation trench corresponding to the foundation (20) on the subgrade section (18); S3. Pour the foundation (20) and the circular body (19): Excavate the transverse through groove, pour the through groove, and use plain concrete for pouring in the non-reinforced section; S4. Cure the base plate limit pile. After the curing is completed, within the laying range of the base plate, lay a micro-surfacing material with a thickness slightly greater than 10 mm, and manually spread and level it; The specific method of excavating the limit pile foundation trench in S2 is as follows: Perform sub-cutting according to the layered rolling construction of lime-stabilized graded crushed stone: For the first time, after the lower layer of lime-stabilized graded crushed stone is rolled, cut according to the size of the foundation (20), but do not break and clean it, and continue to be used as the paving and rolling support surface for the upper layer of filler; For the second time, perform secondary cutting after the asphalt surface passes the acceptance. The cutting size is 1-2 cm larger than the size of the foundation (20) in the longitudinal and transverse directions to ensure that the cutting joint size line does not deviate; The specific process requirements of S3 are as follows: Steel bar binding and pouring: Use the limit pile foundation trench body as the external mold, integrally bind the steel bars of the foundation (20) and the circular body (19), and use the limit device of the circular body (19) to pour the foundation (20) and the circular body (19) horizontally at one time; Elevation requirement: The top elevation of the foundation (20) is controlled to be equal to the asphalt surface. The micro-surfacing at the top of the foundation (20) is considered to be processed synchronously when adjusting the layer under the base plate; Circular body setting: The circular bodies (19) in the straight section of the line are arranged perpendicular to the horizontal line, and the circular bodies in the curve section of the line with superelevation are arranged perpendicular to the superelevation line in units of each mileage and each track slab; The limit device includes a pair of fixed rods (1) arranged in parallel. A number of limit pile molds (3) are arranged between the two fixed rods (1) on both sides, and fixed mechanisms are arranged at both ends of the fixed rods (1); The limit pile mold (3) includes a cylinder with openings at both the upper and lower bottoms, and a number of limit pile mold reinforcement steel plates (2) are arranged on the cylinder; The fixed mechanism includes a base (8). A number of fixing holes are arranged on the base (8), and the base (8) is fixed on the ground through fixing pins arranged in the fixing holes; A support mechanism is arranged on the base (8); The support mechanism includes a support block (5) arranged at the end of the fixed rod (1) through nuts and bolts. A through first threaded hole is arranged on the support block (5); A height control shaft (6) is arranged through the first threaded hole in a matching manner, and a bearing block (7) is rotatably arranged at the lower end of the height control shaft (6); A through second threaded hole is arranged on the bearing block (7) along the length direction of the fixed rod (1); A through third threaded hole is provided on the bearing block (7) along the width direction of the fixing rod (1); A longitudinal limiting plate (10) corresponding to the second threaded hole is provided on the base (8), a first clamping groove is provided on the longitudinal limiting plate (10), and a first bolt (11) is arranged through the first clamping groove and the second threaded hole for connection and fixation; A transverse limiting plate (12) corresponding to the third threaded hole is provided on the base (8), a second clamping groove is provided on the transverse limiting plate (12), and a second bolt (9) is arranged through the second clamping groove and the third threaded hole for connection and fixation; A hexagonal column (4) is provided at one end of the elevation control shaft (6) far from the bearing block (7); The limiting device further includes a transport vehicle; The transport vehicle includes a bottom plate (13), vertical rods (15) are arranged on both sides of the bottom plate (13), sliding grooves are arranged on the opposite side surfaces of the two vertical rods (15), sliders are arranged in the two sliding grooves, an L-shaped lifting plate (14) is arranged between the two sliders, a pair of electric telescopic rods (16) are arranged on one side of the L-shaped lifting plate (14), and the free ends of the pair of electric telescopic rods (16) are arranged on the bottom plate (13); A push rod (17) is arranged on one side of the bottom plate (13).

2. The construction process of the ballastless track base plate limit pile according to claim 1, characterized in that, A plurality of rollers are arranged below the bottom plate (13).

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