JP5118860B2 - Orbital displacement suppression structure with rigid members - 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.
In addition, as a measure for displacement of the track, the entire surface where the displacement occurred may be improved, but it was 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-mentioned object, the first invention has a bank that is provided on the ground and supports the track, and a plurality of suppression members that are provided side by side on the bank surface and suppress the displacement of the track. And the material which comprises the said suppression member is a track | orbit displacement suppression structure characterized by being a material whose rigidity is larger than the said embankment.

The suppression member is made of rod-shaped concrete, and the cross-sectional shape may be any of a circular shape, an elliptical shape, and a polygonal shape. Further, the suppression member is a hollow steel pipe, and the cross-sectional shape may be any of a circular shape, an elliptical shape, and a polygonal shape, and has a filler filled in the steel pipe. Also good.
The restraining member may be constructed by pouring or stirring.
The suppression member may be divided into a plurality of parts, and the suppression member may be provided in the vicinity of the track.
The suppression member may be provided in the vicinity of a concrete structure provided on the ground so as to be in contact with the embankment.
The suppression member may be provided in a direction perpendicular to the longitudinal direction of the embankment, or may be provided in a direction parallel to the longitudinal direction of the embankment. Further, the suppressing member may be a part of the restraining member that provided overlapping in a plurality of stages.

2nd invention is the construction method of the orbital displacement suppression structure characterized by having the process (a) which arranges and provides the several suppression member which consists of a material with rigidity larger than the said embankment on the embankment surface which supports a track | orbit. is there.

  The step (a) may include a step (b) for press-fitting a steel pipe into the embankment and a step (c) for injecting mortar into the steel pipe to provide a restraining member.

The step (a) may be a step of providing the suppression member in the embankment after lifting the track.
The step (a) may include a step (d) of excavating the inside of the embankment to form an excavation hole and a step (e) of providing a suppressing member in the excavation hole.
The step (a) may be a step of injecting a solidifying material into the embankment and providing the suppression member in the embankment.
The step (a) may be a step of excavating the inside of the embankment, replacing a solidified material, and providing the suppression member in the embankment.
The step (a) may be a step of stirring and mixing the inside of the embankment with a solidifying material and providing the suppression member in the embankment.

In the present invention, the track displacement suppression structure includes a suppression member provided near the boundary of the embankment with the track, and the suppression member suppresses the displacement of the track.
Therefore, the orbital displacement suppression structure can be easily constructed by inserting the suppression member into the embankment of the existing structure.

  ADVANTAGE OF THE INVENTION According to this invention, the track | orbit displacement suppression structure which can be easily constructed | assembled to an existing structure can be provided.

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 the first 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 FIGS. 1 and 2, the trajectory displacement suppression structure 1 has a bank 5 provided on the ground 3. A box culvert 11 as a concrete structure is provided on the ground 3 so as to be in contact with the embankment 5.

  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 plurality of restraining members 9 are provided in the embankment 5 in the vicinity of the boundary between the earth roadbed 7 (ballast 10) and the box culvert 11.
The embankment 5 and the restraining member 9 constitute the 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 suppressing member 9 is a member that suppresses the displacement of the track 21 and has a rod-like shape.
As shown in FIG. 4, the suppressing member 9 has steel pipes 9a, 9b, and 9c, and the inside of the steel pipes 9a, 9b, and 9c is filled with mortar 9d as a filler.
Therefore, the restraining member 9 has higher rigidity than the embankment 5.

  In addition, the diameter of the steel pipes 9a, 9b, and 9c is about 300 to 600 mm, and the number 16 of the suppressing members 9 is such that the length 16 (see FIG. 1) including the plurality of suppressing members 9 is about 3 to 10 m. It is desirable that the number is large.

  As shown in FIG. 1, when the train 17 passes on the rail 15, 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 earth 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 first embodiment, since the suppressing member 9 having a rigidity higher than that of the embankment 5 is provided in the vicinity of the boundary between the embankment 5 and the box culvert 11, 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.

In addition, if the suppression member 9 is formed with the material whose rigidity is larger than the embankment 5 at least, there exists an effect which suppresses the rapid change of rigidity.
Therefore, for example, concrete or the like may be used as the suppressing member 9 instead of the steel pipe.

  Moreover, as shown in FIG. 1 and FIG. 2, it is necessary to provide a plurality of restraining members 9, and the restraining members 9 are not connected to each other or are gently connected so as not to constrain their movements. There is a need to.

  This is because, for example, when a single plate-like member is used instead of the plurality of restraining members 9 or when the plurality of restraining members 9 are connected to restrain each other's movement, the local area of the embankment 5 is located below the restraining members. This is because when the subsidence occurs, the restraining member cannot follow the displacement, and a cavity may be generated inside the embankment 5.

  Moreover, it is because there exists a possibility that local concentration of stress may arise in a suppression member by the local settlement of the embankment 5, and it may be damaged.

  For the same reason, the suppression member 9 is desirably divided into a plurality of members, such as steel pipes 9a, 9b, and 9c shown in FIG.

When the suppression member 9 is provided, the sleeper 13 (track 21) is lifted by a jack or the like (not shown), and then the suppression member 9 is pressed into the embankment 5 and provided.
Alternatively, a part of the embankment 5 may be excavated to form an excavation hole, and the suppression member 9 may be provided in the excavation hole, or the material constituting the suppression member 9 is poured into the embankment 5 and solidified by stirring. The suppression member 9 may be provided.

  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.

In addition, the cross-sectional shape of the suppression member 9 is not specifically limited, Arbitrary shapes, such as circular, an ellipse, and a polygon, can be used.
Further, in FIG. 1 and FIG. 2, the suppression member 9 is provided substantially perpendicular to the longitudinal direction of the rail 15, but may be provided parallel to the longitudinal direction of the rail 15.

  As described above, according to the first embodiment, the orbital displacement suppression structure 1 includes the embankment 5 and the suppression member 9, and the suppression member 9 includes the earth road bed 7 (ballast 10) and the box culvert 11 in the embankment 5. Near the boundary.

  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.

  Moreover, according to 1st Embodiment, after suppressing the sleeper 13 with a jack etc., the suppression member 9 can be easily provided in the embankment 5 by the method of pressing the suppression member 9 in the embankment 5 etc. it can.

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.

Next, a second embodiment will be described. FIG. 5 is a cross-sectional view showing an orbital displacement suppression structure 1a according to the second embodiment.
Note that, in the second embodiment, elements having the same functions as those of the trajectory displacement suppression structure 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the second embodiment, in the first embodiment, the orbital displacement suppression structure 1a is constructed in a place where the box culvert 11 is not provided.

  As shown in FIG. 5, the orbital displacement suppression structure 1 a is constructed in a place where the box culvert 11 is not provided, and there are a plurality of suppressions in the vicinity of the boundary between the embankment 5 and the roadbed 7 (ballast 10). A member 9 is provided.

  Even in a place where the box culvert 11 is not provided, depending on the material of the embankment 5 and the condition of the ground 3, there may be a portion where the displacement is locally increased in the embankment 5. In such a case, the displacement can be suppressed by providing the suppression member 9 in a portion where the displacement is increased.

Thus, according to 2nd Embodiment, the orbital displacement suppression structure 1a has the embankment 5 and the suppression member 9, and the suppression member 9 is a boundary in the embankment 5 with the earth roadbed 7 (ballast 10). It is provided in the vicinity.
Accordingly, the same effects as those of the first embodiment are obtained.

Next, a third embodiment will be described.
FIG. 6 is a cross-sectional view showing a track displacement suppression structure 1b according to the third embodiment.
Note that in the third embodiment, elements that perform the same functions as those of the orbital displacement suppression structure 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  3rd Embodiment provides the suppression member 9 in the embankment 5 in multiple steps in 1st Embodiment.

As shown in FIG. 6, the orbital displacement suppression structure 1 b includes a plurality of suppression members 9 provided in multiple stages (three stages in FIG. 6) in the embankment 5.
Thus, the arrangement pattern (length 16, depth 18, number of steps) of the suppressing member 9 can be arbitrarily designed according to the conditions of the ground 3.

Thus, according to 3rd Embodiment, the orbital displacement suppression structure 1b has the embankment 5 and the suppression member 9, and the suppression member 9 is a boundary in the embankment 5 with the earth road base 7 (ballast 10). It is provided in the vicinity.
Accordingly, the same effects as those of the first embodiment are obtained.

  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 first embodiment, the orbital displacement suppression structure 1 is provided in the vicinity of the place where the box culvert 11 is provided, but may be provided in the vicinity of the place where the abutment is provided. .

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. Sectional drawing which shows orbital displacement suppression structure 1a Sectional drawing which shows orbital displacement suppression structure 1b

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 ... Sleeper 15 ... Rail 16 ... Length 17 ... Train 18 ... Depth 19 ... Wheel 21 ... Track

Claims (18)

The embankment provided on the ground and supporting the track ,
A plurality of suppression members provided side by side on the embankment surface and suppressing displacement of the orbit,
Have
The material that constitutes the restraining member is a material that is more rigid than the embankment, and has a track displacement restraining structure.   The orbital displacement suppression structure according to claim 1, wherein the suppression member is made of rod-shaped concrete and has a cross-sectional shape of any one of a circular shape, an elliptical shape, and a polygonal shape. The orbital displacement suppression structure according to claim 1, wherein the suppression member is made of a hollow steel pipe and has a cross-sectional shape of any one of a circular shape, an elliptical shape, and a polygonal shape. The suppression member is
The steel pipe;
A filler filled in the steel pipe;
The orbital displacement suppression structure according to claim 3, wherein:   The orbital displacement suppression structure according to claim 1, wherein the suppression member is constructed by injection or stirring. The trajectory displacement suppression structure according to claim 1, wherein the suppression member is divided into a plurality of portions. The track displacement suppression structure according to any one of claims 1 to 6, wherein the suppression member is provided in the vicinity of the track. The suppressing member, the track displacement prevention structure according to any one of claims 1 to 7, characterized in that provided in the vicinity of the concrete structure provided on the ground so as to be in contact with the embankment . The suppressing member, the track displacement prevention structure according to any one of claims 1 to 8, characterized in that provided in the direction perpendicular to the longitudinal direction of the embankment. The suppressing member, the track displacement prevention structure according to any one of claims 1 to 9, characterized in that provided in a direction parallel to the longitudinal direction of the embankment. The orbital displacement suppression structure according to any one of claims 1 to 10, wherein the suppression member is a part of a suppression member provided in a plurality of stages. A method for constructing an orbital displacement restraining structure, comprising a step (a) of arranging a plurality of restraining members made of a material having rigidity higher than the embankment on the embankment surface supporting the orbit. The step (a)
A step (b) of press-fitting a steel pipe into the embankment;
And step (c) of injected mortar providing the suppressing member in said steel pipe,
The construction method of the orbital displacement suppression structure according to claim 12, comprising: The method of constructing a track displacement suppression structure according to claim 12 or 13, wherein the step (a) is a step of lifting the track and providing the suppression member in the embankment. The step (a) includes a step (d) of excavating the embankment to form an excavation hole;
And step (e) providing the suppressing member to the excavating hole,
The construction method of the orbital displacement suppression structure according to claim 12, comprising:   The method of constructing a track displacement suppression structure according to claim 12, wherein the step (a) is a step of injecting a solidifying material into the embankment and providing the restraining member within the embankment.   The track displacement suppressing structure according to claim 12, wherein the step (a) is a step of excavating the inside of the embankment, replacing a solidified material, and providing the suppressing member in the embankment. Method.   13. The method for constructing an orbital displacement suppression structure according to claim 12, wherein the step (a) is a step of stirring and mixing the inside of the embankment with a solidifying material and providing the restraining member in the embankment.

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