JP4820307B2 - Ladder sleeper - Google Patents

Description

  The present invention relates to a ladder sleeper used for a railway track such as a train, and is intended to easily increase the pull-out resistance of a joint mainly at a joint between a longitudinal beam and a joint.

  In general, a ladder sleeper is integrally formed in a ladder shape by placing concrete beams 1 and 1 made of prestressed concrete and a plurality of steel pipe joints 2 as shown in FIG. 4A. Adopting a mixed rigid structure constructed as above, it has higher rigidity than the conventional lateral sleeper structure, and is said to have extremely high safety against rail loads and rail lateral buckling loads. In recent years, it has been widely used as a structure.

  By the way, conventionally, as shown in FIGS. 4 (b) and 4 (c), for example, the connection between the longitudinal beam 1 and the joint member 2 is performed by arranging the end portion 2 a of the joint member 2 as the main reinforcing steel material of the longitudinal beam 1. It was inserted between the PC steel wires 3 and the reinforcing bars 4 and the like were arranged around the joint end portion 2a, and then the concrete of the vertical beam 1 was cast into one piece.

  In particular, in order to increase the pulling resistance of the joint member 2 end 2a, the end 2a is formed flat by pressing or the like, and the pulling force acting on the joint 2 is mediated by the adhesion force to the concrete end 2a. It was designed to be transmitted to the vertical beam 2.

Japanese Patent No. 3025642 Japanese Patent Laid-Open No. 11-247102

  However, in recent years, it has been desired to increase the function of the escape prevention device at the time of derailment in the ladder sleeper, and in the development of the ladder sleeper with the departure prevention device, it has been necessary to particularly increase the pull-out strength of the joint material.

  As a means for this, it is an effective method to form the end of the joint material flat, but it has been difficult to improve the pull-out strength.

  The present invention has been made in response to this demand, and provides a ladder sleeper that can easily improve the pull-out strength required for a joint material without forming the end of the joint material flat. For the purpose.

The ladder sleeper according to claim 1 is integrally formed in a ladder shape from two longitudinal beams arranged in parallel and a plurality of joint members arranged at predetermined intervals in the axial direction of the longitudinal beam between the longitudinal beams. In the ladder sleeper, a fixing metal is projected at the end of the joint, the fixing metal is formed in a rod shape, and penetrates the through hole formed in the end of the joint in the axial direction of the longitudinal beam. And it is embed | buried in the concrete of the said vertical beam, It is characterized by the above-mentioned.

  In the present invention, there is no need to perform any processing other than making a through hole at the end portion of the joint material. The end of the joint can be combined with the longitudinal beam simply by embedding in the inside.

  In this case, a round joint made of a steel pipe, a square joint made of a square steel pipe, and a joint made of a shape steel such as an H-shaped steel can be used as the joint material. In addition, a steel bar-like member such as a round steel or deformed reinforcing bar can be used as the fixing metal, and the drawing strength of the joint can be freely set by appropriately changing the diameter and number of reinforcing bars. The vertical beam may be a prestressed concrete structure or an RC structure.

The ladder sleeper according to claim 2 is integrally formed in a ladder shape from two longitudinal beams arranged in parallel and a plurality of joint members arranged at predetermined intervals in the axial direction of the longitudinal beam between the longitudinal beams. In the ladder sleeper formed, a fixing metal is projected from the end of the joint material, and the fixing metal is formed of an anchor portion formed in a U shape and a set of hooks formed in a U shape. The anchor portion is inserted into the joint material and fixed to the end portion of the joint material by a solidified material filled in the joint material, and the pair of hooks are embedded in the concrete of the longitudinal beam. It is characterized by.

  The present invention eliminates any processing of the joint material, and the fixing hardware can be easily procured locally by bending a single reinforcing bar. Further, the fixing metal is easily fixed by filling it with a solidifying material such as concrete or mortar after being inserted into the end portion of the joint material.

  In this case, it is preferable to use a steel pipe or a square steel pipe as the joint material. Further, the fixing portion can be easily formed by a method such as bending one end side of a reinforcing bar bent as a fixing metal into a U shape or L shape (hook) or attaching a fixing plate to one end side. it can.

  The ladder sleeper according to claim 3 is the ladder sleeper according to claim 1 or 2, wherein a plurality of fixing hardware are provided in a protruding manner. When a plurality of fixing hardwares are attached, they may be attached by being penetrated in the direction perpendicular to the axis of the joint material at intervals in the axial direction of the joint material, or may be attached in a plurality of stages. Furthermore, you may attach to the edge part of a joint material so that it may penetrate diagonally.

  The present invention relates to a ladder sleeper in which the longitudinal beam and the joint are integrally formed in a ladder shape by fixing the end of the joint in the concrete of the longitudinal beam, in particular, the end of the joint is the joint. Since it is fixed in the concrete of the longitudinal beam through the fixing metal projecting at the end of the joint, the pulling resistance at the end of the joint is extremely large.

  Further, the pulling resistance can be easily increased to a required strength by increasing the diameter and quantity of the fixing hardware.

  1 to 3 show an example of a ladder sleeper according to the present invention. In FIGS. 1 and 2, reference numerals 1 and 1 are two vertical beams arranged in parallel, and the vertical beam 1 is formed of a prestressed concrete structure. ing.

  Reference numeral 2 denotes a joint member disposed between the longitudinal beams 1 and 1 at a predetermined interval in the axial direction of the longitudinal beams 1, 1. The joint member 2 is formed of a highly rigid square steel pipe, and both ends 2 a, 2a is fixed in the concrete of the vertical beam 1 for a predetermined length.

  A fixing metal 5 protrudes mainly from the end portion 2 a of the joint material 2 as a pulling resistance member of the joint material 2. The fixing metal 5 penetrates the through hole 2b formed in the end 2a of the joint material 2 horizontally in the axial direction of the longitudinal beam 1, and both ends 5a and 5a are fixed to the concrete of the longitudinal beam 1 for a predetermined length. Yes.

  The fixing metal 5 is formed of a rod-shaped member such as a reinforcing bar, and the joint material 2 is filled with a solidifying material 6 such as concrete or mortar over the entire length thereof.

  FIGS. 3A to 3C show a modification of the fixing metal, and the fixing metal 7 has a pair of anchors 7a formed in a U shape on one end side and a U shape in the other end side. There are fixing portions (hereinafter referred to as “hooks”) 7b and 7b, respectively. The anchor portion 7a is inserted into the joint material 2 and then joined by the solidifying material 6 such as mortar or concrete filled in the joint material 2 later. 2 projectingly. The pair of hooks 7 b and 7 b are fixed in the concrete of the longitudinal beam 1 together with the end portion of the joint material 2.

  3A shows an example in which the anchor portion 7a is inserted to a deep position substantially at the center of the joint member 2, while FIG. 3B shows that the anchor portion 7a is inserted at a very shallow position at the end portion of the joint member 2. Any of these may be selected.

  In such a configuration, both ends 2 a and 2 a of each joint member 2 are integrally coupled to the concrete of the longitudinal beams 1 and 1 via the fixing metal 5 or 7. In this case, the pulling force acting on the joint member 2 is transmitted to the longitudinal beams 1 and 1 on both sides by the shearing force of the fixing hardware 5 and 7. The pullout strength can be increased by increasing the diameter and quantity of the fixing hardware 5 and 7.

  Table 1 (a) shows the results of the pull-out strength test of the joint material in the ladder sleeper of the present invention and the joint material in the conventional ladder sleeper. As the joint material, a square joint material was used, and as the fixing metal, one formed from deformed reinforcing bars D16 and D19 was used.

  In Table 1 (a), [A] shows a specimen of the joint material in the conventional ladder sleeper shown in FIG. 4 (b), and [B] shows the ladder shown in FIG. 3 (b) of the present invention. The test piece of the joint material in sleeper is shown, and [C] shows the test piece of the joint material in ladder sleeper illustrated in FIG. 2 (b) of the present invention.

  The pull-out test was performed twice for each specimen, and the average values were compared. The result almost coincides with the estimated pulling strength according to the calculation formula shown in Table 1 (b), and the pulling strength of the joint material in the ladder sleeper of the present invention is equal to or more than the pulling strength of the conventional joint material. Was confirmed. It was also confirmed that the pull-out strength of the joint material in the ladder sleeper of the present invention can be easily improved by changing the diameter of the fixing metal.

An example of a ladder sleeper is shown, (a) is a partial perspective view, and (b) is a plan view. The connection part of a vertical beam and a joint material is shown, (a) is a top view, (b) is a longitudinal cross-sectional view. The connection part of a longitudinal beam and a joint is shown, (a), (b) is a top view, (c) is a longitudinal cross-sectional view. An example of a conventional ladder sleeper is shown, (a) is a partial plan view thereof, (b) is a plan view showing a joint portion between the longitudinal beam and the joint member, and (c) is a joint portion between the longitudinal beam and the joint member. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Longitudinal beam 2 Joint material 3 PC steel wire 4 Reinforcement 5 Fixed metal 6 Solidified material 7 Fixed metal

Claims (3)

In the ladder sleeper, which is configured integrally as a ladder from two longitudinal beams arranged in parallel and a plurality of joint members arranged at predetermined intervals in the axial direction of the longitudinal beam between the longitudinal beams. Fixing hardware protrudes at the end of the material, the fixing hardware is formed in a rod shape, penetrates the through hole formed in the end of the joint material in the axial direction of the longitudinal beam, and enters the concrete of the longitudinal beam. Ladder sleeper characterized by being buried. In the ladder sleeper, which is configured integrally as a ladder from two longitudinal beams arranged in parallel and a plurality of joint members arranged at predetermined intervals in the axial direction of the longitudinal beam between the longitudinal beams. A fixing metal is projected from the end of the material, and the fixing metal is formed of an anchor portion formed in a U shape and a pair of hooks formed in a U shape, and the anchor portion is formed in the joint material. The ladder sleeper is characterized in that it is fixed to the end portion of the joint member by the solidified material inserted into the joint member and the set of hooks are embedded in the concrete of the longitudinal beam.   The ladder sleeper according to claim 1 or 2, wherein a plurality of fixing hardware projects.

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