JP3854611B2 - Sleeper support structure and sleeper support method - Google Patents

Description

  The present invention relates to a sleeper support structure and a sleeper support method suitable for application when placing a sleeper on a bridge girder in a railway bridge.

  In recent years, in this type of sleeper support structure, synthetic sleepers are increasingly used instead of wood sleepers due to depletion of wood. However, this synthetic sleeper has a disadvantage that it is inferior in performance to absorb vibration when passing through a train, compared to a wooden sleeper. Therefore, when a synthetic sleeper is employed, it is desirable to interpose a cushioning material made of an elastic material such as a rubber plate between the upper surface of the bridge girder and the bottom surface of the synthetic sleeper in order to compensate for these drawbacks.

As a method of interposing the cushioning material, the bolt hole of the synthetic sleeper is previously formed by penetrating the bolt hole in the vertical direction, the cushioning material and the synthetic sleeper are sequentially placed on the upper side of the bridge girder, and then the synthetic sleeper bolt A method has been employed in which a hook bolt is inserted into the hole so that the hook-shaped head is hooked on the upper flange of the bridge girder, and a nut is screwed onto the male screw portion of the hook bolt in this state (for example, see Patent Document 1). ).
Specification of Japanese Patent No. 311878 (paragraph [0004] column, FIG. 32)

  However, this has the following disadvantages.

  First, since the synthetic sleeper is firmly pressed against the bridge girder by the hook bolt, the cushioning material is sandwiched and compressed between the synthetic sleeper and the bridge girder, and the desired vibration absorbing effect cannot be obtained.

  Second, due to vibration when passing through the train, the nut screwed to the hook bolt gradually loosens, and the cushioning material may be displaced from a predetermined position and fall off. In this case, the vibration absorption effect by the buffer material cannot be expected at all.

  In view of such circumstances, the present invention provides a sleeper support structure and a sleeper support method capable of obtaining a sufficient vibration absorption effect by a cushioning material and capable of maintaining the vibration absorption effect over a long period of time. The purpose is to provide.

In the first aspect of the present invention, the frame type sole plate is fixed to the upper side of the pair of bridge girders, and the cushioning material is placed in each frame type sole plate so as to protrude upward. In addition, each frame-type sole plate is formed with a buffer material fitting hole penetrating therethrough, and the buffer material is placed on the bridge girder. It is characterized by being horizontally mounted.
According to a second aspect of the present invention, the frame-type sole plate is formed with a deformed bolt hole, and a hook bolt with a square root fastens the frame-type sole plate to the bridge girder in the bolt hole. It is engaged in the form which carries out.
The invention according to claim 3 is characterized in that a pair of side guard brackets are provided on the frame type sole plate so as to sandwich the sleepers.
The invention according to claim 4 is characterized in that an uplift stopper is bridged between the pair of side guard brackets so as to penetrate the sleeper.
The invention according to claim 5 is characterized in that the sleeper is formed with a notch at a portion facing the frame-type sole plate.
The invention according to claim 6 is characterized in that a pair of positioning stoppers project downward from the bottom surface of the frame type sole plate so as to sandwich the bridge beam.
The invention according to claim 7 includes a step of providing a frame-type sole plate above each of the pair of bridge girders, a step of placing the cushioning material so as to protrude upward in each of the frame-type sole plates, And a step of placing a sleeper on the upper side of these cushioning materials.

  According to the present invention, it is possible to avoid a situation in which an excessive compressive force acts on the cushioning material, so that a sufficient vibration absorbing effect by the cushioning material can be obtained. Moreover, since there is no possibility that the cushioning material is displaced from the predetermined position and falls off, the vibration absorbing effect by the cushioning material can be maintained for a long time.

  Moreover, since the number of parts is small, the load acting on the bridge girder can be suppressed.

  Furthermore, it is advantageous in that a large-scale work is not involved when the sleeper is replaced using the current structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a plan view showing an embodiment of a sleeper support structure according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a cross-sectional view taken along line AA of FIG. Since this sleeper support structure is basically symmetrical, the illustration of the left half is omitted in FIGS.

  As shown in FIGS. 1 to 5, the sleeper support structure 1 has a pair of steel girders 2 made of H-section steel arranged in the rail extension direction (arrows K and L directions). A plurality of frame-type sole plates 3 are mounted on the upper side of the beam 2 in a form fastened with four hook bolts 5 with square roots.

  That is, each frame type sole plate 3 has a flat substrate 31 as shown in FIGS. A pad fitting hole 32 is formed through the central portion of the substrate 31, and a recess 32 a corresponding to the thickness of the pad underlay plate 10 described later is formed in the lower portion of the pad fitting hole 32. A wall 33 is erected around the pad fitting hole 32. In addition, rectangular bolt holes 34 are formed at the four corners of the substrate 31, and two pairs (four) of female screw portions 35 are formed so as to rise from the surface of the substrate 31 in a pedestal shape. ing. Further, a pair of bracket stoppers 36 are provided on the upper surface of the substrate 31 so as to protrude outwardly from the female screw portion 35. In addition, a pair of positioning stoppers 37 are provided on the bottom surface of the substrate 31 so as to protrude downward from the left and right sides of the pad fitting hole 32. On the other hand, the hook bolt 5 with a square root has a structure in which a square portion 53 is formed between a bowl-shaped head portion 51 and a male screw portion 52, as shown in FIG. The square root hook bolt 5 is engaged with the bolt hole 34 of the frame-type sole plate 3 and the head 14 is engaged with the steel beam 2, and the nut 14 is attached to the male screw portion 52. It is screwed.

  Further, in each frame-type sole plate 3, a vibration absorbing pad 6 made of a synthetic rubber plate having a rectangular plate shape having a plurality of concave portions formed on both the front and back sides as a cushioning material as necessary is provided on the frame-type sole plate 3. It is mounted so as to protrude upward from the wall 33. A pad base plate 10 is interposed between the vibration absorbing pad 6 and the steel beam 2. Further, on the upper side of the vibration absorbing pads 6, a synthetic sleeper 7 is horizontally mounted in the rail width direction (arrow M, N direction). The synthetic sleeper 7 is provided with a notch 71 at a portion facing each frame type sole plate 3.

  Further, a pair of side guard brackets 8 are provided on the frame type sole plate 3 so as to sandwich the synthetic sleeper 7. Each side guard bracket 8 has an L-shaped main body 81 as shown in FIGS. Two pedestal-shaped bolt insertion portions 82 are formed in the horizontal portion of the main body 81, and the upper surface of each bolt insertion portion 82 rises like a pedestal from the horizontal portion surface of the main body 81, and the bottom surface is framed The mold sole plate 3 is recessed so as to match the pedestal female thread portion 35 of the mold sole plate 3. Furthermore, an oval bolt insertion hole 85 is formed in the center of each bolt insertion portion 82 so as to penetrate in the vertical direction. Further, a round hole 83 is formed through the vertical portion of the main body 81. Further, a reinforcing rib 84 is formed so as to connect the horizontal portion and the vertical portion of the main body 81. A long hole 72 extending in the vertical direction is formed in the synthetic sleeper 7 so as to penetrate in the horizontal direction. Between the pair of side guard brackets 8, the uplift stopper 12 made of a combination of bolts and nuts. Is bridged horizontally so as to penetrate the long hole 72 of the synthetic sleeper 7.

  A pair of rails 9 are mounted on the upper side of the synthetic sleeper 7 so as to extend in the directions of arrows K and L.

  Next, the construction procedure of this sleeper support structure 1 is demonstrated based on FIGS.

  First, as shown in FIG. 14, the pad underlay plate 10 is placed on the upper flange of each steel girder 2 as shown in FIG.

  Next, as shown in FIG. 16, the frame-type sole plate 3 is placed on each steel girder 2. At this time, the pad fitting hole 32 of the frame type sole plate 3 is positioned right above the pad underlay plate 10. Then, the pad underlay plate 10 is in a state of being sandwiched between the steel girder 2 and the frame-type sole plate 3 so as to be fitted into the recess 32 a of the pad fitting hole 32. Since the pair of positioning stoppers 37 project downward from the bottom surface of the substrate 31, the frame-type sole plate 3 can be mounted smoothly.

  Next, as shown in FIG. 17, each frame-type sole plate 3 is temporarily fixed to the steel girder 2 with hook bolts 5 with square roots. For this purpose, the square portion 53 of the hook bolt 5 with square root is engaged with the bolt hole 34 of the frame-type sole plate 3 and the head portion 51 is engaged with the steel beam 2, and the nut 14 is attached to the male screw portion 52 in this state. Screw on and tighten lightly. Then, the square root hook bolt 5 is engaged with the bolt hole 34 of the frame-type sole plate 3 and the rotation is restrained, so that the frame-type sole plate 3 is maintained in a state of being fixed to the steel beam 2. can do.

  Next, as shown in FIG. 18, the vibration absorbing pads 6 are fitted and stored in the pad fitting holes 32 of the frame type sole plates 3 and placed on the pad underlay plates 10. Then, the vibration absorbing pad 6 is in a state of protruding upward from the wall body 33 of the frame-type sole plate 3.

  Next, as shown in FIG. 19, the synthetic sleeper 7 is placed on each vibration absorbing pad 6. Then, the synthetic sleeper 7 is supported only by the vibration absorbing pad 6.

  Next, as shown in FIG. 20, a pair of side guard brackets 8 is attached to each frame-type sole plate 3, and the synthetic sleeper 7 is sandwiched. For this purpose, the side guard bracket 8 is placed on the frame type sole plate 3, and the bolt insertion part 82 of the side guard bracket 8 is fitted to the female screw part 35 of the frame type sole plate 3. In this state, the bolt 13 is inserted into the bolt insertion hole 85 of the side guard bracket 8 and screwed to the female screw portion 35 of the frame type sole plate 3. Then, the side guard bracket 8 is fixed to the frame type sole plate 3 with the bolts 13.

  At this time, the female screw portion 35 of the frame type sole plate 3 has a pedestal shape, and the bottom surface of the bolt insertion portion 82 of the side guard bracket 8 is recessed so as to match the female screw portion 35. Positioning is easy. Further, since the bolt insertion hole 85 of the side guard bracket 8 is oval, even if there is a manufacturing error in the frame type sole plate 3 or the side guard bracket 8, the screw 13 can be screwed without any trouble. it can. Furthermore, since the upper surface of the bolt insertion portion 82 of the side guard bracket 8 is raised in a pedestal shape, the tightening force can be increased by increasing the tightening force of the bolt 13 and, after the side guard bracket 8 is installed, It is possible to prevent a situation in which water droplets such as rainwater enter the bolt insertion hole 85 and cause rust.

  Next, each frame type sole plate 3 is fixed to the steel beam 2 with four square root hook bolts 5. For this, the nut 14 screwed into the male threaded portion 52 of the hook bolt 5 with square root is tightened. Then, the frame type sole plate 3 is firmly fixed to the steel beam 2. Also at this time, the square-shaped hook bolt 5 has its square portion 53 engaged with the bolt hole 34 of the frame-type sole plate 3 so that its rotation is restrained. A fixed state can be maintained over a long period of time.

  Next, as shown in FIG. 21, the uplift stopper 12 is bridged between the pair of side guard brackets 8. At this time, the uplift stopper 12 passes through the long hole 72 of the synthetic sleeper 7. Then, the uplift of the synthetic sleeper 7 can be prevented by the uplift stopper 12.

  Finally, a pair of rails 9 are mounted on the upper side of the synthetic sleeper 7.

  Here, the construction of the sleeper support structure 1 is completed.

  In the sleeper support structure 1 thus constructed, the vibration absorbing pad 6 protrudes upward from the wall 33 of the frame type sole plate 3, so that the weight of the rail 9 and the synthetic sleeper 7 is supported only by the vibration absorbing pad 6. It will be. Therefore, when the train passes on the rail 9, the vertical movement of the synthetic sleeper 7 can be absorbed by the vibration absorbing pad 6. Therefore, it is possible to follow the vertical movement of the synthetic sleeper 7 when passing through the train, and it is possible to avoid the problem that the vibration is transmitted to the steel beam 2 as it is. In addition, since the elongated hole 72 of the synthetic sleeper 7 through which the uplift stopper 12 is inserted extends in the vertical direction, there is no possibility of restraining the vertical movement of the synthetic sleeper 7.

  The vibration absorbing pad 6 bears the weight of the rail 9 and the synthetic sleeper 7, but no more external force (such as the fastening force of the hook bolt 5) is applied to the vibration absorbing pad 6. Can exhibit a sufficient vibration absorbing effect.

  Further, since the vibration absorbing pad 6 is fixed in such a manner that its four sides are surrounded by the frame-shaped sole plate 3, there is no possibility that the vibration absorbing pad 6 will be displaced from a predetermined position even if it receives vibration of the train passing on the rail 9. . Therefore, the vibration absorbing effect by the vibration absorbing pad 6 can be maintained for a long time.

  Further, since the notch 71 is formed in the synthetic sleeper 7 at a portion facing each frame type sole plate 3, even if a lateral pressure acts on the synthetic sleeper 7 due to the passage of a train or the like. The cutout 71 of the synthetic sleeper 7 can withstand lateral pressure in the form of coming into contact with the frame-type sole plate 3.

  In addition, in the above-mentioned embodiment, although the case where a steel girder was used as a bridge girder was demonstrated, bridge girders other than a steel girder (for example, a concrete girder, a composite girder) can be substituted.

  Moreover, in the above-mentioned embodiment, although the case where the synthetic sleeper 7 was used as a sleeper was demonstrated, sleepers other than the synthetic sleeper 7 (for example, a wooden sleeper, RC sleeper, PC sleeper, iron sleeper) It is also possible to substitute a cast iron sleeper.

  In the above-described embodiment, the case where the frame-type sole plate 3 in which the rectangular bolt holes 34 are formed is described in order to prevent the rotation of the square-root hook bolt 5. However, the bolt hole 34 of the frame type sole plate 3 is not necessarily rectangular, and may be any shape as long as it has an irregular shape (that is, a shape other than a true circle). For example, even if it is a bolt hole 34, such as a polygon and an ellipse, rotation of hook bolt 5 with a square root can be prevented.

  Moreover, in the above-described embodiment, the case where the frame-type sole plate 3 is mounted on the steel girder 2 after the pad underlay plate 10 is mounted on the upper flange of the steel girder 2 has been described. If the pad underlay plate 10 is previously pasted in the recess 32a of the three pad fitting holes 32, the process can be omitted.

It is a top view which shows one Embodiment of the sleeper support structure which concerns on this invention. It is a front view of the sleeper support structure shown in FIG. It is sectional drawing by the AA line of the sleeper support structure shown in FIG. It is a BB arrow line view of the sleeper support structure shown in FIG. It is sectional drawing by CC line of the sleeper support structure shown in FIG. It is a top view of the frame type sole plate used for the sleeper support structure shown in FIG. It is a front view of the frame type sole plate shown in FIG. It is sectional drawing by the DD line of the frame type sole plate shown in FIG. It is a top view of the side guard bracket used for the sleeper support structure shown in FIG. FIG. 10 is a front view of the side guard bracket shown in FIG. 9. FIG. 10 is a right side view of the side guard bracket shown in FIG. 9. It is an end view by the EE line of the side guard bracket shown in FIG. It is a front view of the hook bolt with a square root used for the sleeper support structure shown in FIG. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state before construction. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which mounted the pad basement board in the steel girder. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which mounted the frame type | mold sole plate in the steel girder. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: The front view (upper side) and the top view (lower side) which show the state which temporarily fixed the frame type sole plate to the steel beam with the hook bolt with a square root It is. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which mounted the vibration absorption pad on the pad basement board. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which mounted the synthetic sleeper on the vibration absorption pad. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which attached the side guard bracket to the frame type | mold sole plate. It is one process figure of the construction procedure of the sleeper support structure shown in FIG. 1, Comprising: They are the front view (upper side) and the top view (lower side) which show the state which spanned the uplift stopper between side guard brackets.

Explanation of symbols

1 ... Sleeper support structure 2 ... Steel girder (bridge girder)
3 ... Frame type sole plate 5 ... Hook bolt with square root 6 ... Vibration absorbing pad (buffer material)
7 …… Synthetic sleeper
8 …… Side guard bracket 12 …… Uplift stopper
32 …… Pad fitting hole (fitting hole for cushioning material)
34 ... Bolt hole 37 ... Positioning stopper 71 ... Notch

Claims (7)

A frame type sole plate is fixed to the upper side of the pair of bridge girders,
In each of the frame-type sole plates, the buffer material is placed so as to protrude upward, and each of the frame-type sole plates is formed with a buffer material fitting hole penetrating therethrough, The cushioning material is placed on the bridge girder,
A sleeper support structure characterized in that a sleeper is horizontally mounted above these cushioning materials. The frame-type sole plate is formed with a deformed bolt hole,
The sleeper support structure according to claim 1, wherein a hook bolt with a square root is engaged with the bolt hole so as to fasten the frame type sole plate to the bridge girder.   The sleeper support structure according to claim 1 or 2, wherein a pair of side guard brackets are provided on the frame type sole plate so as to sandwich the sleepers.   The sleeper support structure according to claim 3, wherein an uplift stopper is bridged between the pair of side guard brackets so as to penetrate the sleeper. The sleeper support structure according to any one of claims 1 to 4 , wherein a notch is formed in the sleeper at a portion facing the frame-type sole plate.   The sleeper support structure according to any one of claims 1 to 5, wherein a pair of positioning stoppers project downward from the bottom surface of the frame-type sole plate so as to sandwich the bridge girder. Providing a frame-type sole plate above each of the pair of bridge girders;
Placing each cushioning material so as to project upward in each frame-type sole plate;
A sleeper support structure comprising a step of placing a sleeper on the upper side of the cushioning material.

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