U-shaped hoop combined structure for ballastless track turnout sleeper

Abstract

The utility model relates to the field of switch sleeper production technology, and specifically discloses a U-shaped hoop bar combined structure for ballastless track switch sleeper, which comprises a U-shaped hoop bar surrounding a lower chord and prestressed reinforcement outside, the U-shaped hoop bar comprises a first arm, two ends of the first arm are respectively connected with a second arm, and the end of the second arm close to an opening is provided with an aperture; the combined structure further comprises a hoop bar positioning insert for fixing the U-shaped hoop bar, the hoop bar positioning insert comprises an insert bar capable of penetrating through the apertures at the ends of the two second arms, the lower chord and the prestressed reinforcement are located in a space formed by the U-shaped hoop bar and the insert bar when the insert bar penetrates through the two apertures, and the outermost lower chord or prestressed reinforcement in the width direction of the cross section of the ballastless track switch sleeper is respectively tightly pressed against the first arm and the insert bar. The U-shaped reinforcement is positioned by the hoop bar positioning insert, and no binding is needed, so that the installation speed of the U-shaped hoop bar is improved.

Description

Technical Field

[0001] This utility model relates to the field of turnout sleeper production technology, specifically a U-shaped stirrup combination structure for turnout sleepers of ballastless tracks. Background Technology

[0002] Turnout sleepers are specialized sleepers used on railway turnouts and are a crucial component of the track foundation in the turnout area. Their function is to support the steel rails in the turnout area, maintain the track gauge and direction, and transfer the load from the rails in the turnout area to the ballast bed. Turnout sleepers are classified by material into wooden turnout sleepers, concrete turnout sleepers, and steel turnout sleepers. Concrete turnout sleepers are characterized by uniform elasticity, long service life, and resistance to deflection, increasing the rigidity and stability of the track. They are also less susceptible to the effects of climate, insect infestation, and fire, and have good corrosion resistance. With the rapid development of high-speed railways, concrete turnout sleepers have become the main type of turnout sleeper currently used. The concrete interior of a ballastless track turnout sleeper contains multiple chords made of coarse steel bars, multiple prestressed steel bars made of fine steel bars, and sleeves. The lower chords and prestressed steel bars are held together by stirrups to enhance the sleeper's compressive, torsional, and shear resistance. U-shaped stirrups are typically used in turnout sleepers and are tied with binding wire. The U-shaped stirrups are usually small, resulting in slow tying speeds and affecting production efficiency. Utility Model Content

[0003] This utility model addresses the problem of slow binding speed of U-shaped stirrups for ballastless track turnout sleepers by providing a convenient U-shaped stirrup assembly structure for ballastless track turnout sleepers.

[0004] To solve the above-mentioned technical problems, this utility model includes a U-shaped stirrup set inside the concrete block of the ballastless track turnout sleeper and surrounding the lower chord and prestressed steel reinforcement. The U-shaped stirrup includes a first arm, and the two ends of the first arm are respectively connected to second arms. Its structural feature is that the end of the second arm near the opening is provided with a bend to form a gap. The combined structure also includes a stirrup positioning insert for fixing the U-shaped stirrup. The stirrup positioning insert includes an insert that can pass through the gap at the end of the two second arms. One end of the insert has a limiting bend that prevents the insert from passing through the upper gap when it passes through the two gaps. When the insert passes through the two gaps, the lower chord and prestressed steel reinforcement are located in the space formed by the U-shaped stirrup and the insert. The outermost lower chord or prestressed steel reinforcement in the width direction of the cross-section of the ballastless track turnout sleeper is tightly pressed against the first arm and the insert.

[0005] After adopting the above structure, once the lower chord and one end of the prestressed steel bar of the ballastless track turnout sleeper are positioned, the U-shaped stirrup is fitted onto the outside of the lower chord and prestressed steel bar and moved to the designed position. Then, the insertion bar of the stirrup positioning bar is inserted through the hole at the end of the upper second reinforcement arm and then inserted into the hole of the lower second reinforcement arm. When the insertion arm passes the other lower chord or prestressed steel bar on the outermost side of the cross-sectional width of the ballastless track turnout sleeper, the lower chord or prestressed steel bar is pressed tightly against the insertion arm, so that the lower chord or prestressed steel bar in contact with the first reinforcement arm is pressed tightly against the first reinforcement arm. Continue to push the stirrup positioning bar so that the insertion bar passes through the hole of the lower second reinforcement arm. The limiting bend prevents the insertion bar from completely passing through the upper hole. At this time, the U-shaped stirrup is positioned, and the U-shaped stirrup and the stirrup positioning bar hold the lower chord and prestressed steel bar in place. This utility model uses stirrup positioning stirrups and U-shaped stirrups to hold the lower chord and prestressed steel bars in place, eliminating the need for binding wire. The stirrup positioning stirrups are inserted through holes, which improves the installation speed and efficiency of the U-shaped stirrups.

[0006] The plane containing the gap formed by the bending of the ends of the two second rib arms is perpendicular to the plane containing the first and second rib arms.

[0007] The pores are elongated or round.

[0008] The connection between the first and second reinforcing arms is chamfered.

[0009] This utility model discloses a U-shaped stirrup assembly structure for ballastless track turnout sleepers. The U-shaped stirrups and stirrup positioning inserts are used together. First, the lower chord and prestressed steel bars pre-embedded in the concrete block are inserted into the space formed by the first and second arms of the U-shaped stirrups through the opening. Then, the insertion bars of the stirrup positioning inserts are inserted through the holes at the ends of the two second arms. At this time, the lower chord or prestressed steel bar on the outermost side of the cross-section of the ballastless track turnout sleeper is tightly pressed against the insertion bars and the first arm, respectively, to achieve the positioning of the U-shaped stirrups. The stirrup positioning inserts, which are installed by insertion, replace the binding wires, making installation and use convenient and greatly improving the installation speed and efficiency of the U-shaped stirrups. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the U-shaped stirrup assembly structure of this utility model in use; Figure 3 for Figure 2 View from direction A; Figure 4 This is a schematic diagram of another form of U-shaped stirrup combination structure; Figure 5 Here is a schematic diagram of the existing U-shaped hoop. Figure 6 This is a schematic diagram of the use of existing U-shaped hoops; In the diagram: 1. U-shaped stirrup; 11. First stirrup arm; 12. Second stirrup arm; 13. Short back bend; 14. Hole; 2. Stirrup positioning insert; 21. Insert bar; 22. Limiting bend; 100. Top chord; 200. Bottom chord; 300. Wavy connecting bar; 400. Side prestressed steel bar; 500. Middle prestressed steel bar; 600. Sleeve; 700. Spiral positioning bar; 800. U-shaped stirrup; 801. Third stirrup arm; 802. Fourth stirrup arm; 803. Fifth stirrup arm; 804. End hook; 900. Binding wire. Detailed Implementation

[0011] Figure 5 This is a schematic diagram of a U-shaped hoop 800 used in the prior art for binding the lower chord 200 and prestressed steel bars in the concrete block of a turnout sleeper for ballastless track. The U-shaped hoop 800 includes a third reinforcing arm 801, with a fourth reinforcing arm 802 and a fifth reinforcing arm 803 connected to its two ends respectively. The connection between the third reinforcing arm 801 and the fourth and fifth reinforcing arms 802 and 803 is chamfered. The third reinforcing arm 801, the fourth reinforcing arm 802 and the fifth reinforcing arm 803 are in the same plane. The end of the fourth reinforcing arm 802 near the opening is provided with an end hook 804 for hooking the lower chord 200. The end hook 804 is formed by bending the end of the fourth reinforcing arm 802. The bent section of the end hook 804 is located in the plane where the third reinforcing arm 801, the fourth reinforcing arm 802 and the fifth reinforcing arm 803 are located. Figure 6 This is a schematic diagram showing the use of the U-shaped hoop 800. Figure 6 The diagram illustrates the arrangement of chord members and prestressed steel reinforcement in a ballastless track turnout sleeper. The chord members enhance the sleeper's bending resistance, while the prestressed steel reinforcement improves its strength and durability. The arrangement includes two sets of chord members, each consisting of one lower chord member 200 and two upper chord members 100. The upper chord members 100 are positioned above the lower chord members 200. Each upper chord member 100 is connected to the lower chord member 200 at multiple points via corrugated connecting ribs 300. Viewed from the cross-section of the ballastless track turnout sleeper, the two upper chord members 100 are symmetrically distributed on both sides of the lower chord member 200, and the two sets of chord members are also symmetrically distributed. Figure 6The arrangement of the center chord is a relatively common chord configuration for ballastless track turnout sleepers. The cross-section of the ballastless track turnout sleeper, as described in this invention, refers to the plane perpendicular to the length direction of the chord and prestressed steel bars. The ballastless track turnout sleeper includes multiple prestressed steel bars, specifically two side prestressed steel bars 400 and two center prestressed steel bars 500. In the width direction of the ballastless track turnout sleeper's cross-section, the two side prestressed steel bars 400 are located on the outermost side of all the lower chords 200 and prestressed steel bars. The two lower chords 200 are positioned slightly inward relative to the two outermost side prestressed steel bars 400. The width direction of the ballastless track turnout sleeper's cross-section refers to... Figure 6 In the left and right directions, the actual ballastless track turnout sleeper can be equipped with more prestressed steel bars, such as six. The prestressed steel bars can also be prestressed steel strands. The concrete block of the ballastless track turnout sleeper also has a sleeve 600 pre-embedded in it. The sleeve 600 is positioned by a spiral positioning bar 700 set outside the sleeve 600. The spiral positioning bar 700 is connected to the sleeve 600 and then welded to the middle prestressed steel bar 500 or the corrugated connecting bar 300 to fix the sleeve 600. The chord, corrugated connecting bar 300 and prestressed steel bars are usually threaded steel bars. The chord is thicker, while the corrugated connecting bar 300 and prestressed steel bars are thinner. The U-shaped hoop 800 and the spiral positioning bar 700 are usually smooth round bars. The lower chord 200, prestressed steel bars, U-shaped hoop 800, sleeve 600 and spiral positioning bar 700 are pre-embedded in the concrete block, while the upper chord 100 is outside the concrete block. When binding the U-shaped hoops 800, position one end of the lower chord 200 and the prestressed steel bar, and then fit the designed number of U-shaped hoops 800 onto the lower chord 200 and the prestressed steel bar. Then, bind the U-shaped hoops 800 to the designed position with binding wire 900. The opening directions of two adjacent U-shaped hoops 800 can be opposite. Then fix the sleeve 600, weld the spiral positioning bar 300 to the middle prestressed steel bar 500, and then weld the corrugated connecting bar 300 to the lower chord 200. The corrugated connecting bar 300 can be pre-welded and fixed to the upper chord 100 before being welded to the lower chord 200. Since the cross-section of the turnout sleeper is not large, the U-shaped hoops 800 are generally designed to be small, the steel bars are relatively dense, binding is inconvenient, the binding speed is slow, and the efficiency is low.

[0012] Reference Figure 1-4The present invention relates to a U-shaped stirrup assembly structure for ballastless track turnout sleepers, comprising a U-shaped stirrup 1 disposed inside the ballastless track turnout sleeper and surrounding the lower chord 200 and the prestressed steel reinforcement, and stirrup positioning inserts 2 used in conjunction with the U-shaped stirrup 1. The U-shaped stirrup 1 includes a first stirrup arm 11, with second stirrup arms 12 connected to both ends of the first stirrup arm 11. The first stirrup arm 11 and the two second stirrup arms 12 form a U-shape with one end open, and the first stirrup arm 11 and the two second stirrup arms 12 are in the same... In a plane, the connection between the first reinforcing arm 11 and the second reinforcing arm 12 is chamfered. The end of the second reinforcing arm 12 near the opening has a bent opening 14. A stirrup positioning insert 2 is used to fix the U-shaped stirrup 1. The stirrup positioning insert 2 includes an insert 21 that can pass through the opening 14 at the ends of the two second reinforcing arms 12. One end of the insert 21 has a limiting bend 22 that prevents the insert 21 from completely passing through the upper opening 14. Figure 2 , 3 As shown, the insert bar 21 passes through the hole 14 at the end of the upper second reinforcing bar arm 12 from top to bottom, and then through the hole 14 at the end of the lower second reinforcing bar arm 12. When the limiting bend 22 touches the outer contour of the upper hole 14, it prevents the insert bar 21 from sliding further downward. The insert bar 21 also serves to position the insertion end of the insert bar 21. The U-shaped stirrup 1 and the stirrup positioning insert bar 2 are made of smooth round bars. When the insert bar 21 passes through the two holes 14, the lower chord 200 and the prestressed steel bar are located at the U-shaped stirrup 1. Within the space formed by the insertion reinforcement 21, the outermost lower chord 200 or prestressed steel bar in the width direction of the cross-section of the ballastless track turnout sleeper is tightly pressed against the first reinforcement arm 11 and the insertion reinforcement 21, respectively, applying pressure to the U-shaped stirrup 1 and the stirrup positioning reinforcement 2 outward, thus achieving the effect of "supporting" outward. The U-shaped stirrup 1 and the stirrup positioning reinforcement 2 are positioned, and at the same time, the lower chord 200 and the prestressed steel bar are clamped. Depending on the arrangement of the lower chord 200 and the prestressed steel bar, the lengths of the two second reinforcement arms 12 can also be different.

[0013] Reference Figure 1-4 The plane containing the holes 14 formed by the bends at the ends of the two second reinforcing arms 12 is perpendicular to the plane containing the first reinforcing arm 11 and the second reinforcing arm 12, facilitating the insertion of the reinforcing rib 21 through the two holes 14. Alternatively, the plane containing the holes 14 can also be at a certain angle to the plane containing the first reinforcing arm 11 and the second reinforcing arm 12, as long as the insertion of the reinforcing rib 21 can pass through the two holes 14. Figure 1 , 4 As shown, pore 14 is an elongated or round pore. Figure 1 The end of the second reinforcing arm 12 is bent 180° to form a short, looped reinforcing bar 13. The second reinforcing arm 12 is parallel to the short, looped reinforcing bar 13, and the resulting hole 14 is an elongated hole. Figure 4The end of the second reinforcing arm 12 is bent to form a circular hole. The hole 14 can also be of other shapes, as long as the inserting reinforcing bar 21 can pass through it. Similarly, Figure 1 The limiting bend 22 is formed by bending the upper end of the inserted rib 21 by 90°. Figure 4 The upper end of the insertion rib 21 is bent to form a round hole. The limiting bend 22 can also be bent into other shapes, as long as it can prevent the insertion rib 21 from completely passing through the hole 14.

[0014] It should be noted that the terms "upper," "lower," "left," and "right" in this utility model are used to describe the ballastless track turnout sleeper shown in the attached drawings. When the ballastless track turnout sleeper is flipped, the positional relationship of the upper and lower chords, prestressed steel bars, etc., changes, but this does not limit the structure of the U-shaped stirrup combination structure of this utility model.

[0015] Usage process: Figure 2 , 3 The use of the arrangement of chord members and prestressed steel bars in the U-shaped stirrup combination structure for turnout sleepers of this utility model will be explained by taking the arrangement of chord members and prestressed steel bars as an example. Figure 2 , 3 The arrangement of the upper chord 100, lower chord 200, corrugated connecting rib 300, side prestressed steel rib 400, central prestressed steel rib 500, sleeve 600, and spiral positioning rib 700 of the turnout sleeper in ballastless track is similar to... Figure 6 The same applies, so it will not be repeated here. In use, after positioning one end of the lower chord 200, the side prestressed steel bar 400, and the middle prestressed steel bar 500, the required number of U-shaped stirrups 1 are fitted onto the outside of the lower chord 200 and the prestressed steel bar. The other end of the lower chord 200 and the prestressed steel bar can also be positioned. Then, the U-shaped stirrups 1 are moved separately to the design position, and then the stirrup positioning inserts 2 are inserted. When inserting, one end of the insert bar 21 without the limiting bend 22 passes through the hole 14 at the end of the upper second reinforcing arm 12 from top to bottom, and then inserts downward into the hole 14 at the end of the lower second reinforcing arm 12 until the limiting bend 22 touches the outline of the upper hole 14. When the insert bar 21 is inserted downward, since the side prestressed steel bar 400 will touch the insert bar 21, the insert bar 21 may undergo slight deformation when forcefully inserted into the lower hole 14. After the U-shaped stirrup 1 and the stirrup positioning insert 2 are positioned, the sleeve 600 embedded in the concrete block is installed. The sleeve 600 is positioned by the spiral positioning rib 700, which is welded to the central prestressed steel bar 500. Then, the corrugated connecting rib 300 is welded to the lower chord 200, and the corrugated connecting rib 300 can be pre-welded and fixed to the upper chord 100. The above is based on... Figure 2 , 3The arrangement of the chord members and prestressed steel bars is illustrated using the example shown. When other arrangements are used, such as when the lower chord member 200 is located at the outermost edge of the cross-sectional width of the turnout sleeper in ballastless track, the lower chord member 200 is tightly pressed against the insert bar 21. In this invention, the U-shaped stirrup 1 is positioned without the need for binding wire 900. Instead, the U-shaped stirrup 1 is positioned by inserting the stirrup positioning insert bar 2, simultaneously securing the lower chord member 200 and the prestressed steel bars. This method is convenient and quick, improving the installation speed of the U-shaped stirrup 1.

[0016] This utility model discloses a U-shaped stirrup assembly structure for ballastless track turnout sleepers, comprising U-shaped stirrups and stirrup positioning inserts used in conjunction. The U-shaped stirrup includes one first arm and two second arms. Holes are provided at the ends of the two second arms of the U-shaped stirrup near the opening. When positioning the U-shaped stirrup, the insert of the stirrup positioning insert passes through the holes at the ends of the two second arms. At this time, the two outermost lower chords or prestressed steel bars in the width direction of the cross-section of the ballastless track turnout sleeper are closely pressed against the first arm and the insert, thereby positioning the U-shaped stirrup. No binding wire is required, making installation convenient and improving the installation speed and efficiency of the U-shaped stirrup.

Claims

1. A U-shaped stirrup assembly structure for ballastless track turnout sleepers, comprising U-shaped stirrups (1) disposed within the concrete block of the ballastless track turnout sleeper and surrounding the lower chord (200) and prestressed steel bars, wherein the U-shaped stirrups (1) include a first stirrup arm (11), and the two ends of the first stirrup arm (11) are respectively connected to second stirrup arms (12), characterized in that: The second reinforcing arm (12) has a bend forming a hole (14) at its end near the opening; the combined structure also includes a stirrup positioning insert (2) for fixing the U-shaped stirrup (1), the stirrup positioning insert (2) includes an insert (21) that can pass through the hole (14) at the end of the two second reinforcing arms (12), one end of the insert (21) is provided with a limiting bend (22) that prevents the insert (21) from passing through the upper hole (14) when the insert (21) passes through the two holes (14), when the insert (21) passes through the two holes (14), the lower chord (200) and the prestressed steel bar are located in the space formed by the U-shaped stirrup (1) and the insert (21), and the outermost lower chord (200) or prestressed steel bar in the width direction of the cross section of the ballastless track turnout sleeper is tightly pressed against the first reinforcing arm (11) and the insert (21).

2. The U-shaped stirrup assembly structure for turnout sleepers of ballastless track according to claim 1, characterized in that: The plane containing the hole (14) formed by bending the ends of the two second rib arms (12) is perpendicular to the plane containing the first rib arm (11) and the second rib arm (12).

3. The U-shaped stirrup assembly structure for turnout sleepers of ballastless track according to claim 1, characterized in that: The pore (14) is an elongated pore or a round pore.

4. The U-shaped stirrup assembly structure for turnout sleepers of ballastless track according to claim 1, characterized in that: The connection between the first rib (11) and the second rib (12) is chamfered.

Images