JP4210882B2 - Railway bridge sleeper fixing device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hook sleeper mainly used for fixing a bridge sleeper to a steel material in a railway bridge and a bridge sleeper fixing device using a bridge sleeper. The purpose is to reduce the expenditure of difficult repair work and enormous repair costs.
[0002]
[Prior art]
As a conventional technique for fixing a bridge sleeper to a steel material, a hook bolt proposed by the present inventor is generally known (see Japanese Patent Laid-Open No. 10-82407). This is because when a wooden bridge sleeper (2) is fixed to the I-type steel material (3) on the bridge, it has a hook part (11) at the tip, and a male screw part on the opposite side of the rod-like body part and the hook part. The hook bolt (4) formed with the head portion is used to lock the hook portion (11) to the upper flange of the I-type steel material (3), and the body portion of the hook bolt (4) is The nut (5) is screwed through the square washer (6) into the upper end head of the hook bolt (4) that is inserted into the bolt hole formed at the end of the bridge sleeper (2) and protrudes through the bolt hole. And fastened and fixed the bridge sleepers (2).
[0003]
[Problems to be solved by the invention]
However, in the case of using the above-mentioned bridge sleeper fixing means, the hook bolt body section shape is basically a perfect circle, so that the hook bolt is gradually passed with repeated passage of heavy trains. When loosening occurs in tightening, the hook bolts rotate together to disengage the engaging direction of the hook portion engaged with the flange of the steel material, so that it is easy to come off from the steel material.
[0004]
In addition, in the structure described in the publication of the above-described conventional example, a getter washer (21) having both wings (10) hitting the steel end face is welded to the rear part of the hook part (11) in order to eliminate the rotation of the hook bolt. Further, as shown in FIG. 10, the groove (9) is formed along the length direction in the body of the hook bolt (4), and the claws (8) are formed at the four corners as shown in FIG. In addition, a square washer (6) in which a convex detent (7) is protruded toward the inner circumferential direction at a part of the hook bolt hole in the circumferential direction is used. 7) is fitted into the recessed groove (9) of the hook bolt (4), and the hook (8) is bitten into the wooden bridge sleeper (2), thereby removing the hook part from the I-type steel (3). Although it has been devised to prevent, rust is generated especially in the coastal area. And it takes less than about biting of the hook shown in the figure 9 (8), is not incomplete practical fastening when tightening the bolts.
[0005]
In addition, as described above, forming a concave groove along the length direction of the hook bolt not only affects the cost, but also affects the durability of the hook bolt. As a result, the fastening force decreases, and the prevention of co-rotation gradually becomes incomplete due to corrosion, wear, etc. of the square washer. As a result, many phenomena have occurred in which the hook bolt rotates and the hook part comes off from the bridged H steel. In addition, the hook bolts and nuts are rusted, and when the nuts are tightened from the bridge, the hook bolts "co-rotate" together.
[0006]
In addition, for the repair work, a temporary scaffold is installed under the bridge, and the nut is retightened from the top while holding the hook part from the bottom, resulting in enormous costs and danger for work on the bridge. The nature is also high. In addition, it is difficult to grasp the situation of the hook part from the bridge, and there is also a problem in terms of maintenance management.
[0007]
[Means for Solving the Problems]
Therefore, the present invention permanently maintains the engagement of the hook portion with the steel material even when the hook bolt is loosened over time without deteriorating the durability of the hook bolt and at a low processing cost. It proposes an epoch-making structure that can be made. Specifically, on a steel material, a bridge sleeper placed in a crossing direction with respect to the length direction thereof, and the bridge sleeper is fixed to the steel material. It consists of hook bolts , and the bridge sleepers are pre-formed with square bolt holes such as triangles, squares, hexagons, etc., and the hook bolts are inserted through the hooks that are locked to the steel material and the bolt holes of the bridge sleepers. However, a trunk portion matched to the shape of a rectangular bolt hole formed in advance on the bridge sleeper, a head portion protruding upward through the bolt hole of the bridge sleeper, and a part of the trunk portion from the head portion It consists of a threaded part applied to Duck the hook portion by local heating bending, together with the inner circumferential side of the range of the curvature R15~60mm in that bent portion, which has improved rigidity and resilience by subsequently subjected to hot forging It relates to a railway bridge sleeper fixing device .
[0008]
In the above configuration, the cross section formed in the body of the hook bolt in the bridge sleeper is formed in advance with a bolt hole having a shape corresponding to a square shape such as triangle, square, hexagon, etc., and the hook portion of the hook bolt is made of steel. The hook of the hook bolt protruding through the bolt hole is inserted into the bolt hole of the bridge sleeper after the trunk portion is aligned with the bolt hole shape. A nut is screwed into the upper end head part through a washer, and this is fastened and fixed to fix the bridge sleeper to the steel material.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the specific contents of the present invention will be described with reference to the embodiment shown in FIGS. 1 and 2. Reference numeral 1 represents a hook bolt, and the hook bolt 1 has a substantially J-shape for locking to a steel material. A hook portion 2, a straight body portion 3, a head portion 4, and a screw portion 5 applied from the head portion 4 to a part of the body portion 3, and the body portion described above. 3 has a non-circular cross-sectional shape.
[0010]
The shape of the non-circular cross section in this case is formed in a quadrangular cross section in the case of the present embodiment, but is not necessarily limited to a quadrilateral, and is a triangular shape such as a triangle, pentagon, hexagon, etc. sufficient if, in short section is not a perfect circle, the bolt hole of the corresponding square cross-sectional shape and which formed a bridge sleeper, the circumferential any part on the outer circumferential surface either circumferential direction of the bolt hole in the wall of bridge sleeper Any shape may be used as long as it is in contact with this portion and its rotation is restricted.
[0011]
Further, when the hook portion 2 bent in a substantially J shape has an inner peripheral curvature of R14 mm or less at the bent portion, the engagement of the hook portion 2 becomes worse, and conversely, the inner peripheral curvature is R60 mm. Exceeding the flange width of the H-shaped steel material, the opening width of the hook part 2 becomes excessively large, and the engagement state is also poor, so that the inner peripheral side of the bent part of the hook part 2 is deteriorated. It is necessary to make the curvature within a range of R15 to 60 mm. Furthermore, the metal structure strength can be improved by subjecting the portion to hot forging after the heat bending process, whereby the rigidity and the recoverability can be improved.
[0012]
In this way, when the curvature on the inner peripheral side of the bent portion of the hook portion 2 is in the range of R15 to 60 mm and hot forging is performed after the heat bending of the portion, for example, a square shape with a diameter of 26 mm In the case of the hook bolt, as shown below, the strength is increased approximately three times as compared with the conventional 25 mm round hook bolt.
[0013]
<25mm diameter round hook bolt>
Cross-sectional area: A ₄ = {π / 4} × 25 ² = 491 mm ²
Section modulus: Z ₁ = {π / 32} × 25 ³ = 1533 mm ³
<26mm diameter hook bolt>
Cross-sectional area: A ₅ = {1/2} × (27 + 8) × 36 = 630 mm ³
Section ^{_{modulus: Z 2 = {27 2 +}} 4 × 27 × 8 + 8 2/12 (8 × 2 + 27)} × 36 2 = 4162mm 3
[0014]
<Comparison>
Ratio of cross-sectional areas: A ₅ / A ₄ = 630/491 = 1.28 times Ratio of cross-sectional coefficients: Z ₂ / Z ₁ = 4162/1533 = 2.71 times
In the above description, the cross-sectional area ratio is 1.28 times, but the cross-section coefficient ratio is 2.71 times, which is due to the result that the body section is square or trapezoidal and the rib effect at each corner is enhanced. is there. In the above case, if the forging effect by stamping forging is 1.1 to 1.2 times, the overall effect is that the section modulus is 2.71 × 1.1 = 2.98, and the durability is almost tripled. It became clear that
[0016]
Next, the use of the hook bolt described above will be described with reference to FIGS. 1 and 2. The bridge includes a bridge abutment, a bridge pier, and a bridge girder H steel 10 supported by the bridge girder, and a height adjustment plate on the bridge girder H steel 10. 11, a bridge sleeper 12 is placed so as to cross the length direction of the bridge girder H steel 10, and a rail 14 is placed on the bridge sleeper 12. The bridge sleepers 12 are previously drilled with bolt holes 13 for inserting hook bolts at both left and right ends thereof.
[0017]
The bolt hole 13 in this case needs to have a cross-sectional shape corresponding to the cross-sectional shape formed on the body portion 3 of the hook bolt 1 to be used, and the bridge sleeper 12 is made of wood such as a kite or Kempas. Is drilled by using a drilling machine having a square cross section or the like (for example, only an automatic elevation angle manufactured by Hitachi, Ltd. BS30Y). When the bridge sleeper 12 is made of glass fiber reinforced resin, the above-described square punching machine may be used, or a square pipe may be inserted and injection molded. Furthermore, when the bridge sleepers are made of concrete, square pipe pieces may be embedded in advance.
[0018]
For fixing the bridge sleeper 12 to the H steel material 10, first, the head portion 4 of the hook bolt 1 is inserted into the bolt hole 13 from the lower side of the bolt hole 13 of the bridge sleeper 12, and the hook portion 2 is attached to the H steel material 10. In a state where it is engaged with the flange 10a, the head part 4 is projected upward from the upper end of the bolt hole 13, and a round washer 6 and a spring washer 7 are inserted into the screw part 5 of the head part 4 from above, The hard lock lower nut 8a is tightened with a specified torque, and the upper nut 8 is screwed thereon, and then the upper nut 8 is tightened with a predetermined torque after the lower nut 8a is pressed.
[0019]
Further, an R pin 9 is inserted into a pin hole formed at the upper end of the threaded portion 5 of the hook bolt 1 so that the hook bolt 5 can be prevented from dropping even if the upper nut 8 is loosened. Is fixed to the H steel material 10.
[0020]
【The invention's effect】
As apparent from the above description, the present invention
It consists of a bridge sleeper placed on the steel material in a direction crossing the length direction, and a hook bolt that fixes the bridge sleeper to the steel material . The bridge sleeper is preliminarily made of triangles, squares, hexagons, etc. A square bolt hole is formed, and the hook bolt is hooked to the steel material, and the shape of the square bolt hole formed in the bridge sleeper that is inserted into the bolt hole of the bridge sleeper. combined and the body has a head portion which protrudes upward through the bolt hole of the bridge sleeper, in order ing from the threaded portion which has been subjected over the part of the body portion from the head portion, at a low cost Moreover, not only the durability is remarkably improved, but also the hook bolts are rotated together and the engaging direction of the hook portion engaged with the flange of the steel material is displaced, so that it does not come off from the steel material and prevents the co-rotation. it can be, but also economical, tooth efficient maintenance be It is possible to prevent the current danger.
[0021]
To The hook portion by local heating bending, with preferably the curvature of the inner circumference side to kick in the bent portion in the range of R15～60mm, then the stiffness and resilience to the facilities of the hot forging In particular, looseness or vibration caused by meat ridges / weathering of wooden bridge sleepers can be absorbed to a large extent by the resilience of the square hook bolts themselves, ensuring safety of track maintenance work, greatly improving efficiency, In addition, maintenance management can be enhanced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a usage state of a square hook bolt according to the present invention.
FIG. 2 is a side view showing a usage state of a square hook bolt according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hook bolt 2 Hook part 3 Trunk part 4 Head part 5 Thread part 6 Round washer 7 Spring washer 8 Upper nut 8a Lower nut 9 R pin

Claims (1)

It consists of a bridge sleeper placed on the steel material in a direction crossing the length direction, and a hook bolt that fixes the bridge sleeper to the steel material . The bridge sleeper is preliminarily made of triangles, squares, hexagons, etc. A square bolt hole is formed, and the hook bolt is hooked to the steel material, and the shape of the square bolt hole formed in the bridge sleeper that is inserted into the bolt hole of the bridge sleeper. combined and the body has a head portion which protrudes upward through the bolt hole of the bridge sleeper, it consists of a threaded portion which has been subjected over the part of the body portion from the head portion, moreover the hook in, The local heat bending process makes the curvature on the inner circumference side of the bent part within the range of R15-60mm, and then the hot forging process improves the rigidity and resilience of the railway. Bridge sleeper fixing device.

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