JP4958575B2 - Orbital displacement suppression structure with low elastic member - Google Patents

Description

  The present invention relates to a track displacement suppression structure.

  Conventionally, railroad tracks composed of sleepers, rails, and ballasts have been provided on the embankment or on a roadbed provided on the embankment.

  In such a structure, since the rigidity of the embankment is small, the track may be displaced due to the passage of the train, which may impair the running stability of the train.

  In particular, when a concrete structure such as an abutment or box culvert is adjacent to the embankment, the support stiffness at the boundary between the concrete structure and the embankment changes abruptly, causing displacement of the track due to ballast flow. It was easy to make a step at the boundary.

In such cases, a crushed stone layer called an approach block may be provided at the boundary between the concrete structure and the embankment to suppress sudden changes in support rigidity. Is known (Non-Patent Document 1).
Railway Technical Research Institute, “Railway Structure Design Standards / Summary-Earth Structure”, Maruzen, November 10, 1992, p. 332

  However, it is difficult to provide a new approach block for an existing structure that does not have an approach block, and it is difficult to construct such a structure.

Further, when a new box culvert or the like is newly constructed on the existing embankment, it is difficult to newly provide an approach block, and it is difficult to construct such a structure.
Furthermore, as a measure for the displacement of the track, the entire surface where the displacement occurs may be improved, but it is very expensive.

  The present invention has been made in view of such a problem, and an object thereof is to provide a low-cost orbit displacement control structure that can be easily constructed in an existing structure.

In order to achieve the above-described object, the first invention is provided on the ground so as to be in contact with each other, and embankment and concrete structure for supporting the track, and on the track side between the concrete structure and the track. And a restraining member for restraining the displacement of the track, and the material constituting the restraining member is a material having rigidity smaller than that of the concrete structure. It is.

  The material constituting the suppressing member may be rubber, polystyrene foam, resin, or silicon, and may have a plate shape.

2nd invention is provided so that it may contact with embankment, and has the process (a) which provides the suppression member in the said track side between the concrete structure which supports a track, and the said track, The track displacement characterized by the above-mentioned This is a method for constructing a suppression structure.
3rd invention has the process (a) which provides the suppression member between the concrete structure provided so that it may contact with embankment, and supports a track | truck, and the said track | orbit, The said process (a) is the said track | orbit A method for constructing a track displacement suppression structure, which is a step of providing the suppression member between the concrete structure and the track after lifting up.

In the present invention, the track displacement suppression structure includes a suppression member provided between the concrete structure and the track, and the suppression member suppresses the displacement of the track.
Therefore, the track displacement suppression structure can be easily constructed by inserting the suppression member between the concrete structure and the track of the existing structure.

  According to the present invention, it is possible to provide a low-cost orbit displacement suppression structure that can be easily constructed in an existing structure.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.
FIG. 1 is a cross-sectional view showing a track displacement suppression structure 1 according to this embodiment, and FIG. 2 is a perspective view of FIG.
3 is a view showing the particle size distribution of the ballast 10, and FIG. 4 is an enlarged view of the suppressing member 9 shown in FIG.

  As shown in FIG. 1 and FIG. 2, the orbital displacement suppression structure 1 has a fill 5 provided on the ground 3, and further, a concrete structure provided on the ground 3 so as to be in contact with the fill 5. It has a box culvert 11 as an object.

  An earth road base 7 is provided on the embankment 5 and the box culvert 11, and a ballast 10 is provided on the earth road base 7. In addition, there is a structure which does not have the earth roadbed 7.

A plurality of sleepers 13 are provided on the ballast 10, and a pair of rails 15 are provided on the sleepers 13.
The sleeper 13, the rail 15, and the ballast 10 constitute a track 21.

A restraining member 9 is provided in the earth road bed 7 above the box culvert 11.
That is, the suppression member 9 is provided between the box culvert 11 and the track 21.

  The embankment 5, the box culvert 11, and the restraining member 9 constitute an orbital displacement restraining structure 1.

  The embankment 5 is a portion that keeps the surface on which the track 21 is provided horizontal and supports the load of the train 17, and clay soil, sandy soil, gravelly soil, or the like is used.

The box culvert 11 is a box-shaped waterway or road and is made of concrete.
The earth roadbed 7 is a member provided to transmit the load of the train 17 to the embankment 5 evenly, and natural soil or crusher run is used.

When natural soil is used as the soil roadbed 7, it is desirable to use one that satisfies the following requirements.
Maximum particle size ………………………………………… 75mm or less Percentage of particles passing through standard mesh sieve 0.075mm… 2-20%
Percentage of particles that pass through a standard mesh sieve of 0.425 mm ... Less than 40% Uniformity factor ……………………………………………… 6 or more Liquid limit ………………… ………………………………… 35 or less Plasticity index …………………………………………………… 9 or less

  Further, when a crusher orchid is used as the earth roadbed 7, it is desirable to use one that conforms to the standards of C-40, C-30, and C-20 of JIS A 5001 “Crushing stone for road”.

The ballast 10 is a member for uniformly transmitting the load of the train 17 to the embankment 5, the box culvert 11, and the roadbed 7, and for reducing noise generated by the train 17, such as granite, diorite, andesite, basalt, etc. Crushed stone is used.
In addition, as a particle size distribution of the ballast 10, what is shown in FIG. 3 is mention | raise | lifted.

  The sleepers 13 are members that support the rails 15. The rails 15 are portions through which the wheels 19 of the train 17 shown in FIG. 1 pass.

The suppression member 9 is a member that suppresses the displacement of the track 21 and has a plate shape as shown in FIGS. 2 and 4.
The restraining member 9 is made of a material having a rigidity lower than that of the box culvert 11.

Examples of such a material include rubber, polystyrene foam, resin, silicon and the like.
Examples of the rubber include urethane rubber and SBR (Styrene-butadiene rubber) based synthetic rubber.

In addition, as for the suppression member 9, it is desirable to form with the material and thickness that the amount of elastic deformation in the upper surface of the suppression member 9 at the time of a train load effect | action will be less than 3 mm.
Moreover, the thickness of the suppression member 9 is about 25-100 mm.

  As shown in FIG. 1, when a train 17 passes on the rail 15 of the track displacement suppression structure 1, the load of the train 17 is transmitted to the embankment 5 and the box culvert 11 through the sleepers 13, the ballast 10, and the roadbed 7. .

Here, since the embankment 5 has a very small rigidity as compared with the box culvert 11, the rigidity changes rapidly in the vicinity of the boundary between the embankment 5 and the box culvert 11.
Therefore, when the train passes through the boundary many times and a load is repeatedly applied, the embankment 5 and the track 21 near the boundary are likely to be deformed, and a step due to the displacement may occur.

However, in the present embodiment, since the restraining member 9 having a rigidity lower than that of the box culvert 11 is provided between the box culvert 11 and the track 21, a sudden change in rigidity does not occur.
Therefore, the suppression member 9 can prevent a step due to the displacement from occurring at the boundary.

When the restraining member 9 is provided, the restraint member 9 is press-fitted between the box culvert 11 and the raceway 21 after the sleepers 13 (the raceway 21) are lifted by a jack (not shown) or the like.
Alternatively, a portion of the roadbed 7 may be excavated and replaced with the suppressing member 9, or the material constituting the suppressing member 9 is injected into the roadbed 7 and solidified by stirring to provide the suppressing member 9. Also good.

  As described above, the orbital displacement suppression structure 1 can be easily constructed even in an existing structure where it has been difficult to provide an approach block in the past, and it is not necessary to separately improve the ground. It is.

  Moreover, the orbital displacement suppression structure 1 can be easily constructed even when a box culvert or the like is newly constructed on an existing embankment.

  Thus, according to this embodiment, the orbital displacement suppression structure 1 includes the embankment 5, the box culvert 11, and the suppression member 9, and the suppression member 9 is provided between the box culvert 11 and the track 21.

  Therefore, a sudden change in rigidity at the boundary between the box culvert 11 and the embankment 5 can be suppressed, and the displacement of the track 21 can be suppressed.

  Further, according to the present embodiment, the restraining member 9 is a plate-like member, and the restraint member 9 is pressed between the box culvert 11 and the track 21 after the sleeper 13 is lifted by a jack (not shown) separately. Can be easily provided.

Therefore, the orbital displacement suppression structure 1 can be easily constructed even in an existing structure that has conventionally been difficult to provide an approach block, and is low in cost.
Moreover, the orbital displacement suppression structure 1 can be easily constructed even when a box culvert or the like is newly constructed on an existing embankment, and is low in cost.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, in the present embodiment, the suppression member 9 is provided between the box culvert 11 and the track 21, but may be provided between the abutment and the track 21.

Sectional drawing which shows orbital displacement suppression structure 1 1 is a perspective view of FIG. The figure which shows the particle size distribution of the ballast 10 Enlarged view of the restraining member 9 of FIG.

Explanation of symbols

1 …… Orbital displacement suppression structure 3 ………… Ground 5 ………… Fill 7 ………… Soil base 9 ………… Suppression member 9a ……… Steel pipe 9d ……… Mortar 10 ……… Ballast 11 ……… Box culvert 13 ……… Sleeve 15 ……… Rail 16 ……… Length 17 ……… Train 19 ……… Wheel 21 ……… Track

Claims (5)

Embankments and concrete structures provided on the ground so as to contact each other and supporting the track;
A suppressing member provided on the track side between the concrete structure and the track, for suppressing displacement of the track;
Have
The material that constitutes the restraining member is a material that is less rigid than the concrete structure.   The orbital displacement suppressing structure according to claim 1, wherein the material constituting the suppressing member is any one of rubber, polystyrene foam, resin, and silicon.   The orbital displacement suppression structure according to claim 1, wherein the suppression member has a plate shape. A method for constructing a track displacement suppression structure, comprising: a concrete structure provided in contact with the embankment and supporting a track; and a step (a) of providing a suppression member on the track side between the track . A step (a) of providing a restraining member between a concrete structure provided to contact the embankment and supporting the track, and the track;
Wherein step (a), by raising the track, orbital method for constructing a displacement prevention structure, characterized in that the step of providing the suppression member between the concrete structure and the track.

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