JPH10273901A - Ladder type sleeper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of joint parts jointed by fastening bolts at the end parts of each cross beam by forming the longitudinal end parts of each longitudinal beam of fiber reinforced concrete over the specified length. SOLUTION: A ladder type sleeper is composed of right and left longitudinal beams 1 installed on ballast, parallel with each other in the continuous direction of the ballast so as to support rails 2, and cross beams 3 installed between the longitudinal beams 1 at specified spaces in the longitudinal direction so as to connect the right and left longitudinal beams 1 to each other. The longitudinal beam 1 is provided with a plurality of high strength steel wires 1b inserted through over the whole length so as to lead in prestress. Insert nuts are embedded in both longitudinal end parts of the longitudinal beam 1, or bolt holes are formed therein and used to thread-fasten or pass connecting bolts for jointing the longitudinal beams 1 to each other through joint plates at the time of laying the ladder type sleeper. The generation of a crack to the peripheral part of a connecting bolt joint part of each longitudinal beam end part is thereby prevented, and the connecting bolt can be easily fastened into a correct position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to two vertical beams extending parallel to a continuous direction on a roadbed, and a plurality of vertical beams installed between the vertical beams and connecting the vertical beams. It relates to a ladder type sleeper consisting of a horizontal surface.

[0002]

2. Description of the Related Art Heretofore, conventional pillow tracks have been constructed by independently installing a plurality of horizontal pillows so as to intermittently support rails on a track bed. There are problems such as easy track deviation and a great deal of labor is required for maintenance.Therefore, ladder-type sleepers have recently been used for reasons such as stable tracks and easy maintenance. Have been.

A ladder-type sleeper extends parallel to the continuation direction on a track bed, and is provided at two predetermined beams supporting rails at predetermined intervals in the longitudinal direction of the vertical beams. A ladder-shaped sleeper is composed of a plurality of horizontal beams connecting the vertical beams, and a ladder-type sleeper has the ends of the vertical beams butted against each other, and a connecting plate is attached to both sides of the vertical beams. Is connected to the connection plate by bolting the connection plate with a plurality of connection bolts.

[0004]

However, since the vertical beam of the ladder type sleeper is made of reinforced concrete and formed as thin as possible to reduce the weight, cracks and cracks are formed around the connecting bolt. Are liable to occur, and there is a problem in terms of impact resistance and the like.

[0005] The present invention has been made to solve the above problems, and an object of the present invention is to provide a ladder-type sleeper which can sufficiently withstand joining by fastening bolts.

[0006]

In order to solve the above-mentioned problems, a ladder type sleeper according to the present invention has a longitudinal end formed of fiber reinforced concrete over a predetermined length. It consists of.

Further, a prestress is introduced by inserting a plurality of high-strength steel wires into a vertical beam along the longitudinal direction. Further, a plurality of insert nuts or a plurality of bolt holes are formed at the longitudinal end of the vertical beam.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 of the Invention 1 to 3 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes a right and left vertical beam which is installed on a track bed in parallel with a continuous direction thereof and supports rails 2 respectively. The horizontal beams are installed between the vertical beams 1, 1 at predetermined intervals in the longitudinal direction, and connect the left and right vertical beams 1 to each other.

The left and right vertical beams 1 are formed in a substantially trapezoidal cross section from reinforced concrete, and particularly, both end portions 1a in the longitudinal direction.
Is made of fiber reinforced concrete over a certain range (50 cm to 1 m) in the longitudinal direction. Examples of the fiber reinforcing material include steel fiber, carbon fiber, aramid fiber, and vinylon fiber, and are mixed in concrete at a ratio of about 10 to 20%. A plurality of high-strength steel wires 1b are inserted through the entire length of the vertical beam 1, and a predetermined large prestress is introduced over the entire length in the longitudinal direction by the high-strength steel wires 1b. Further, at the upper end of the left and right vertical beam 1, rail fastening fittings 4 for fixing the rail 2 laid thereon are buried at predetermined intervals, and inserts are inserted at both longitudinal end portions 1a of the left and right vertical beam 1. A nut (not shown) is embedded or a bolt hole (not shown) is formed. The insert nut is for screwing a connecting bolt for connecting the vertical beams 1 through a connecting plate when laying a ladder type sleeper, and a bolt hole for passing the connecting bolt. Things. Reference numeral 1c is a stirrup streak that also serves as a holding member that holds the high-strength steel wire 1b.

The horizontal beam 3 is formed of a steel pipe, and both ends are integrally joined to the left and right vertical beam 1 and are provided at predetermined intervals in the longitudinal direction of the vertical beam 1. In addition, the horizontal 3 is covered with a curing sheet 8 made of synthetic rubber having high weather resistance.

Embodiment 2 of the Invention 4 to 6 show another embodiment of the present invention. In the drawings, the same portions as those of the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.

The horizontal beam 3 is formed of a steel pipe, and protrudes horizontally inside the left and right vertical beams 1 respectively. A circular plate-shaped or rectangular plate-shaped joint flange 5 is protruded from the free end of the horizontal beam 3, and the joint flanges 5 are connected to each other by a plurality of joining bolts 6. In addition, left and right vertical beams 1,1
To prevent signal failure due to the flow of current between
An insulating material 7 made of rubber or the like is interposed.

Embodiment 3 of the Invention Next, a method for manufacturing the ladder type sleeper according to the present invention will be described.

First, a high-strength steel wire 1b, a stirrup bar 1c also serving as a holding member for holding the high-strength steel wire 1b, a rail fastening metal fitting 4, and a side warp are formed in a vertical forming mold (not shown). Set 3 respectively. The high-strength steel wire 1b is pulled and pulled by a hydraulic jack (not shown) or the like.

[0015] Next, concrete is poured into the vertical forming mold and sufficiently cured. At that time, fill both ends of the vertical forming mold in the longitudinal direction with concrete mixed with fiber reinforcing material, fill other parts except both ends with ordinary concrete, and further add Insert the insert nut accordingly. Then, after sufficiently curing, the mold is released.

Next, the joint flanges 5 extending in parallel with the two vertical beams 1 and 1 and protruding from the distal ends of both the horizontal beams 3 are joined with the insulating material 7 interposed therebetween. Joined by bolts or welding.

[0017]

The present invention has the above-described structure, and in particular, the longitudinal ends of the right and left vertical beams are reinforced by forming them with fiber-reinforced concrete over a certain length, so that the vertical beams When the ends are connected by connecting bolts, there is no fear that cracks or cracks will occur around the bolts, and there is an effect that the ladder type sleepers can be securely and firmly joined together.

Further, since the bolt holes or the insert nuts are buried at the longitudinal ends of the vertical beams, the connection bolts can be easily tightened, and the fiber reinforcing material is mixed in place of the reinforcing bars. There is an effect that a bolt hole can be easily formed at an accurate position without a reinforcing bar becoming an obstacle, and an insert nut can be easily embedded at an accurate position.

[Brief description of the drawings]

FIG. 1 is a plan view of a ladder type sleeper.

FIG. 2 is an enlarged cross-sectional view taken along line aa of FIG.

FIG. 3 is an enlarged sectional view taken along line bb of FIG. 1;

FIG. 4 is a plan view of a ladder type sleeper.

FIG. 5 is an enlarged sectional view taken along the line cc of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line dd of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vertical beam, 2 ... Rail, 3 ... Horizontal, 4 ... Rail fastening bracket, 5 ... Joint flange, 6 ... Joint bolt, 7 ... Insulating material, 8 ... Curing sheet.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyoshi Chujo 1-12-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Steel String Concrete Co., Ltd. (72) Inventor Hiroaki Higashiyama 1-1-21 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 1 Japan Steel String Concrete Co., Ltd.

Claims (4)

[Claims] 1. A vehicle comprising two right and left vertical beams extending in parallel along a roadbed, and a plurality of horizontal beams installed between the left and right vertical beams and connecting the two left and right vertical beams. A ladder type sleeper, wherein a longitudinal end of the vertical beam is formed from fiber reinforced concrete over a predetermined length. 2. A prestress is introduced into the vertical beam by inserting a plurality of high-strength steel wires through the vertical beam along the longitudinal direction thereof. Ladder type sleeper. 3. A sleeper according to claim 1, wherein a plurality of insert nuts are buried at ends of the longitudinal beam in the longitudinal direction. 4. The sleeper according to claim 1, wherein a plurality of bolt holes are formed at an end of the longitudinal beam in the longitudinal direction.