JP2013199807A - Countermeasure method against freezing damage to concrete slab track and concrete slab track - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a countermeasure method and the like against freezing damage to a concrete slab track, capable of suppressing deterioration of a padding layer of a concrete slab track due to freezing damage.SOLUTION: A concrete slab track 1 comprises: a track concrete slab 5; a CA mortar 7, which is a padding layer underneath the track concrete slab 5; and a concrete track bed 3 underneath the CA mortar 7. A part of or all of a deteriorated part 7a, which is an end part of the CA mortar 7 in a track width direction and is deteriorated by freezing damage, is removed, and an adiabatic material 8a is disposed on the outside of the remaining end part. An adiabatic material 8b is disposed on the CA mortar 7 in a gap 16 between the end parts of the track concrete slabs 5, which are adjacent to each other in a track direction. The adiabatic materials 8a and 8b suppress temperature change of the CA mortar 7 due to diurnal variation of ambient temperature, and suppress deterioration due to freezing damage or the progress of the deterioration.

Description

  The present invention relates to a slab track frost damage countermeasure method and a slab track. More specifically, the present invention relates to a frost damage countermeasure method for suppressing deterioration due to frost damage of a packed bed of a slab track, and a slab track with frost damage countermeasures taken.

  Currently, slab tracks are often used as rail tracks. The slab track is composed of the track slab, the filling layer below the track slab, and the concrete roadbed below the filling layer. The rail is firmly supported by the track slab and the filling layer. There is an advantage that less maintenance is required.

  However, the slab track installed in cold districts has various effects due to the outside air temperature becoming below freezing point, and measures for this need to be taken. For example, Patent Document 1 describes that a heat insulating panel for preventing frost heaving is provided on the lower surface of the roadbed concrete in order to prevent the roadbed concrete of the railway track from receiving frost heave pressure from the lower ground.

JP 2007-23653 A

  By the way, in the existing slab track as described above, CA (cement asphalt) mortar used for the packed bed tends to deteriorate in recent years. One of the causes of deterioration of CA mortar is due to frost damage. In other words, with the diurnal change in the outside air temperature in winter and cold regions, the temperature inside the CA mortar goes back and forth between zero degrees and below zero degrees, and the water in the CA mortar freezes and thaws repeatedly, so that the CA mortar The strength decreases due to cracking or peeling.

  Such deterioration will not affect the rail support performance if it is the outer periphery of the packed bed, but if the deterioration progresses inside, it may affect the rail support performance. It is necessary to prevent.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a slab track frost damage countermeasure method and the like that can suppress deterioration due to frost damage of the packed layer of the slab track.

  A first invention for achieving the above-mentioned object is a slab track frost damage countermeasure method having a track slab and a packed bed below the track slab, wherein the end of the packed bed in the track width direction is provided. The slab track frost damage countermeasure method is characterized in that the first heat insulating material is disposed outside the slab track.

  According to 1st invention, since a heat insulating material is arrange | positioned outside the edge part of the track width direction of the packed bed by CA mortar etc., the temperature change of the inner packed bed accompanying the daily change of external temperature is suppressed, Furthermore, since the intrusion of moisture into the packed bed is also suppressed, the deterioration due to frost damage or the progress of the deterioration is suppressed.

Moreover, it is desirable to arrange | position a 2nd heat insulating material on the outer side of the said packed bed in the plane position corresponding between the edge parts of the said track slab adjacent to a track direction.
Thereby, also in the clearance gap between track | orbit slabs, a heat insulating material is arrange | positioned on the outer side of a packed bed, and deterioration of an inner packed bed is further suppressed.

The track slab is a frame-type track slab having an opening on a plane, and it is also desirable to dispose a third heat insulating material on the opening side of the packed bed.
Thereby, also when using the frame type track | orbit slab which has an opening part, deterioration of the filling layer from this opening part side is prevented.

Moreover, it is desirable to arrange | position the said 1st heat insulating material outside the deterioration part by frost damage of the edge part of the track width direction of the said filling layer.
By leaving the deteriorated part of the packed bed, this deteriorated part can act as a heat insulating layer.

Further, after removing at least part of the deteriorated portion due to frost damage at the end of the packed bed in the track width direction, the first heat insulating material is placed outside the end of the packed bed in the track width direction. Is preferably arranged so as not to protrude from the end of the track slab in the track width direction.
Thereby, since the area which a heat insulating material exposes outside becomes small, deterioration of a heat insulating material by ultraviolet rays etc. is suppressed.

Moreover, it is desirable to provide a cover outside the first heat insulating material.
Thereby, it becomes possible to suppress deterioration of the heat insulating material due to ultraviolet rays or the like, and the effect of the heat insulating material can be maintained.

In addition, the covering is preferably a formwork.
Thereby, the shape of the heat insulating material due to deterioration or the like can be prevented, and the effect of the heat insulating material can be more reliably maintained.

  A second invention is a slab track having a track slab and a packed bed below the track slab, wherein the first heat insulating material is disposed outside an end of the packed bed in the track width direction. It is a slab trajectory characterized by that.

In the slab track of the second invention, it is desirable that the second heat insulating material is disposed outside the packed bed at a corresponding plane position between the end portions of the track slab adjacent in the track direction.
The track slab is a frame-type track slab in which an opening is provided on a plane, and it is also desirable that a third heat insulating material is disposed on the opening side of the packed bed.
It is also desirable that the first heat insulating material is disposed outside the deteriorated portion due to frost damage at the end of the packed bed in the track width direction.
Furthermore, it is desirable that the first heat insulating material is disposed so as not to protrude from an end portion of the track slab in the track width direction.
In addition, it is also desirable that a cover be provided outside the first heat insulating material.
Alternatively, the covering may be a formwork.

  The second invention relates to a slab track that has been subjected to frost damage countermeasures by the frost damage countermeasure method of the first invention.

  ADVANTAGE OF THE INVENTION According to this invention, the frost damage countermeasure method of a slab track | orbit etc. which can suppress degradation by the frost damage of the filling layer of a slab track | truck can be provided.

Perspective view of slab track 1 The figure shown about heat insulating material 8a, 8b The figure which shows the arrangement | positioning procedure of the heat insulating material 8a The figure which shows the arrangement | positioning procedure of the heat insulating material 8b The figure which shows the arrangement | positioning procedure of the heat insulating materials 8a and 8b The figure shown about the heat insulating material 8b The figure shown about the heat insulating material 8c Diagram showing slab track 1b Diagram showing heat insulating material 8d

  Hereinafter, embodiments of the slab track frost damage countermeasure method and the like of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, a first embodiment of the slab track frost damage countermeasure method of the present invention will be described. Initially, the slab track | orbit 1 in which the frost damage countermeasure by the frost damage countermeasure method of 1st Embodiment was performed is demonstrated.

  FIG. 1 is a perspective view of the slab track 1. As shown in FIG. 1, the slab track 1 is formed of a concrete roadbed 3, a track slab 5, CA mortar 7, heat insulating materials 8a and 8b, protrusions 9, rails 11 and the like.

In the slab track 1, a CA mortar 7 that is a packed bed is installed below the track slab 5. In addition, a concrete road bed 3 is installed below the CA mortar 7.
The track slab 5 is arranged in series in the track direction of the slab track 1. The protrusion 9 is provided between adjacent track slabs 5. The protrusion 9 has a reinforced concrete structure and restrains the horizontal movement of the track slab 5. A CA mortar 17 is provided between the protrusion 9 and the track slab 5.
The rail 11 is fastened to the upper surface of the track slab 5 by a rail fastening device 22 and is provided along the track direction of the slab track 1.

  And in this embodiment, the heat insulating material 8a (1st heat insulating material) and the heat insulating material 8b (2nd heat insulating material) are provided in the outer side of CA mortar 7. FIG. As the heat insulating materials 8a and 8b, those conventionally known as heat insulating materials having a heat insulating effect can be appropriately used, and urethane foam, urethane foam, polystyrene foam and the like can be used.

  Next, the arrangement of the heat insulating materials 8a and 8b will be described with reference to FIG. FIG. 2 is a diagram showing the heat insulating materials 8 a and 8 b in the slab track 1. 2A is a diagram showing a cross section taken along line AA in FIG. 1, and FIG. 2B is a diagram showing a cross section taken along line BB in FIG. FIG. 2C shows the plane of the CA mortar 7 in the vicinity of the adjacent portion of the track slab 5. In addition, in FIG.2 (c), arrangement | positioning of the track | orbit slab 5 above the CA mortar 7 is shown by the dotted line. Moreover, in each figure, the degradation part 7a which CA mortar 7 deteriorated by the freezing damage was represented as a hatching part.

  As shown in FIGS. 2A and 2C, the side surface of the CA mortar 7 recedes from the side surface of the track slab 5 at the end of the CA mortar 7 in the track width direction orthogonal to the track direction. positioned. The heat insulating material 8a is disposed at a position inside the end portion so as not to protrude from the end portion of the upper track slab 5 in the track width direction in the space outside the set-back CA mortar 7.

  2B and 2C, the heat insulating material 8b is disposed above (outside) the CA mortar 7 in the gap 16 between the end portions of the track slab 5 adjacent in the track direction. Is done.

  The CA mortar 7 inside the heat insulating material 8a and below the heat insulating material 8b is a deteriorated portion 7a deteriorated by frost damage, which will be described later.

Next, the arrangement | positioning procedure of the heat insulating materials 8a and 8b is demonstrated using FIGS.
3-5 is a figure shown about the arrangement | positioning procedure of heat insulating material 8a, 8b, and is a figure which shows the location corresponding to FIG. 2 (a)-FIG.2 (c), respectively.

  In the present embodiment, as shown in FIG. 5A, in the slab track 1 before measures against frost damage, the gap between both ends in the track width direction and the ends of adjacent track slabs 5 where the CA mortar 7 touches the outside air. It is assumed that a deteriorated portion 7a deteriorated due to frost damage is formed around a plane position corresponding to 16.

  In the slab track frost damage countermeasure method of the present embodiment, first, the deteriorated portions 7a at both ends in the track width direction of the CA mortar 7 shown in FIG. As shown in 3 (b), a part of the degraded portion 7a is removed. Thereafter, as shown in FIGS. 3C and 5B, a heat insulating material 8a having the same width as the depth of the deteriorated portion 7a is disposed in the space formed by removing the deteriorated portion 7a. As described above, the heat insulating material 8a is disposed so as not to protrude from the end of the upper track slab 5 in the track width direction.

  On the other hand, foamed urethane or the like is blown from above into the gap 16 between the ends of the track slab 5 in the track direction at the adjacent locations in the track direction of the track slab 5 shown in FIG. As shown in FIG. 5 (c), a heat insulating material 8 b is disposed above the deteriorated portion 7 a of the CA mortar 7.

  In this manner, the heat insulating materials 8a and 8b are disposed outside the CA mortar 7 where the CA mortar 7 which is the packed bed of the slab track 1 is in contact with the outside air, and measures against frost damage of the slab track 1 are taken.

  As described above, according to the first embodiment, the heat insulating material 8a is disposed outside the end portion in the track width direction of the CA mortar 7 that is the packed bed, and the track slab 5 adjacent in the track direction. Since the heat insulating material 8b is disposed above the CA mortar 7 between the end portions of the mortar, the temperature change inside the CA mortar 7 due to the daily change of the outside air temperature is suppressed and stabilized at zero or more (or less than zero), and Since the intrusion of moisture into the CA mortar 7 is also suppressed, the progress of deterioration of the CA mortar 7 due to frost damage is suppressed.

Further, in this embodiment, when the heat insulating material 8a is disposed, the deteriorated portion 7a at the end in the track width direction of the CA mortar 7 is removed only by the width of the heat insulating material 8a, and the upper track slab is placed in the space. The heat insulating material 8a is arranged so as not to protrude from the end in the orbit width direction. Thereby, since the area which the heat insulating material 8a exposes becomes small, deterioration of the heat insulating material by ultraviolet rays etc. is suppressed.
Furthermore, in this embodiment, a part of the deteriorated portion 7a at the end in the orbit width direction of the CA mortar 7 is left, but in this case, due to the effect of the void formed by cracking, peeling or the like of the deteriorated portion 7a. The degraded portion 7a left without being removed can serve as a heat insulating layer. Note that it is possible to remove all of the deteriorated portion 7a.

  Moreover, in this embodiment, the integral heat insulating material 8a is arrange | positioned on the outer side of the edge part of the track width direction of CA mortar 7, However, it is not restricted to this, For example, the some heat insulating material 8a is spaced apart. It may be arranged in layers. In this case, the air layer between the heat insulating materials 8a also contributes to the heat insulating effect.

Further, in the present embodiment, the heat insulating material 8b is provided by blowing urethane foam or the like from the upper part in the gap 16 between the track slabs 5. In addition to this, for example, heat insulation such as urethane foam from the side of the gap 16 is provided. You may arrange | position through the material 8b.
Further, as shown in FIG. 2B and the like, the heat insulating material 8b is disposed above the deteriorated portion 7a of the CA mortar 7 in the gap 16, but as shown in FIG. As in the case of, after removing a part or all of the deteriorated portion 7a, this may be replaced with the heat insulating material 8b.

  Thus, the present invention is not limited to the one described as the first embodiment. Hereinafter, a second embodiment of the present invention will be described. In the second embodiment, differences from the first embodiment will be mainly described, and the same points as those in the first embodiment will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted.

[Second Embodiment]
FIG. 7 is a view for explaining a second embodiment of the slab track frost damage countermeasure method and the like, and shows a cross section corresponding to FIG.

In 2nd Embodiment, as shown to the slab track | orbit 1a of Fig.7 (a), the deterioration part 7a of the edge part of the track width direction of the CA mortar 7 which is a filling layer is not removed, but a heat insulating material on the outer side It is different from the first embodiment in that 8c is arranged.
Even in this case, as in the first embodiment, the CA mortar 7 can be prevented from being deteriorated due to frost damage, and the heat insulating layer is left on the deteriorated portion 7a left without being removed due to the effect of the void formed in the deteriorated portion 7a. As a role. Furthermore, there is an advantage that the work of removing the deteriorated portion 7a can be omitted and the construction becomes easy.

Further, as shown in FIG. 7B, a cover 12 may be provided outside the heat insulating material 8c, whereby deterioration of the heat insulating material 8c due to ultraviolet rays or the like can be suppressed, and the effect of the heat insulating material 8c is maintained. can do.
Further, the cover 12 may be a mold, and in this case, for example, urethane foam or the like as the heat insulating material 8c may be injected and filled in the mold. The mold frame can suppress deterioration due to ultraviolet rays or the like, can prevent the heat insulating material 8c from being deformed due to deterioration or the like, and can more reliably maintain the effect of the heat insulating material 8c.
In addition, this cover 12 or a formwork is applicable also to the heat insulating material 8a of 1st Embodiment. Furthermore, you may apply to the said heat insulating material 8b.

[Third Embodiment]
Next, a third embodiment of the slab track frost damage countermeasure method and the like will be described.

FIG. 8 is a diagram illustrating a slab track 1b that has been subjected to frost damage countermeasures according to the frost damage countermeasure method of the third embodiment.
The slab track 1b differs from the slab track 1 of the first embodiment in that a frame-type track slab 5a is used instead of the track slab 5. Since other points are the same as those of the first embodiment, description thereof is omitted.

  The frame-type track slab 5a is open at the center of the plane, and the slab track 1b is open at the corresponding position in the CA mortar 7 below. In the third embodiment, since the frost damage of the CA mortar 7 occurs even around the opening 30 as described above, the CA mortar 7 also has a heat insulating material 8d (third type) at the end on the opening 30 side on the plane. Measures against frost damage by heat insulation).

  FIG. 9 is a diagram showing the arrangement of the heat insulating material 8d. FIG. 9A is a diagram showing a cross section taken along line CC in FIG. 8, and FIG. 9B is the same as FIG. 2C in the vicinity of the adjacent portion of the frame-type track slab 5a. The plane of CA mortar 7 is shown.

  As shown in the figure, in the present embodiment, the same heat insulating materials 8a and 8b as those described above are arranged, and the deteriorated portion 7a formed around the opening 30 is also a predetermined depth from the opening 30 side. Then, a part of the degraded portion 7a is removed, and the heat insulating material 8d is disposed in the removed space. The heat insulating material 8d is the same as the heat insulating materials 8a and 8b. Moreover, in this embodiment, the heat insulating material 8d is arrange | positioned so that it may not protrude from the plane of the frame-type track | orbit slab 5a.

Thus, in the third embodiment, the heat insulating material 8d is arranged on the side of the opening 30 located in the center of the plane of the frame-type track slab 5a as well as the first embodiment, and the CA mortar 7 is caused by frost damage. Deterioration can be prevented.
In this embodiment, the heat insulating material 8d is disposed with the deteriorated portion 7a interposed therebetween. However, as in the second embodiment, the heat insulating material is provided on the outer side (opening 30 side) without connecting the deteriorated portion 7a. 8d may be arranged. The covering 12 or the formwork can be similarly applied.

  Moreover, although the example which performs the frost damage countermeasure of the existing slab track | orbit in which CA mortar partially degraded was shown in the above embodiment, the frost damage countermeasure method of this invention is the existing slab in which CA mortar has not degraded. It can also be applied to orbits. By arranging the heat insulating material as described in the first to third embodiments, deterioration due to frost damage of CA mortar is suppressed. Further, in the above embodiment, the filling layer has been described as a CA mortar. However, the present invention is not necessarily limited to this, and even in cases other than CA mortar, various thermal effects can be exerted on the filling layer by providing a heat insulating material. The influence of can be suppressed.

  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.

1, 1a, 1b ......... Slab track 3 ......... Concrete roadbed 5 ......... Track slab 5a ......... Frame type track slab 7 ......... CA mortar 7a ......... Degraded part 8a, 8b, 8c, 8d ... …… Insulation material 11 ……… Rail

Claims (14)

A slab track frost damage countermeasure method comprising a track slab and a packed bed below the track slab,
A slab track frost damage countermeasure method, wherein a first heat insulating material is disposed outside an end portion of the packed bed in the track width direction.   2. The slab track according to claim 1, wherein a second heat insulating material is disposed outside the packed bed at a planar position corresponding to an end portion of the track slab adjacent in the track direction. How to deal with frost damage. The track slab is a frame-type track slab provided with an opening in a plane,
The slab track frost damage countermeasure method according to claim 1 or 2, wherein a third heat insulating material is disposed on the opening side of the packed bed.   The slab track according to any one of claims 1 to 3, wherein the first heat insulating material is disposed outside a deteriorated portion due to frost damage at an end portion in the track width direction of the packed bed. How to deal with frost damage.   After removing at least a part of the deteriorated part due to frost damage at the end in the orbit width direction of the packed bed, on the outside of the end in the orbit width direction of the remaining packed bed, the first heat insulating material, The slab track frost damage countermeasure method according to any one of claims 1 to 4, wherein the track slab is disposed so as not to protrude from an end portion in a track width direction of the track slab.   The frost damage countermeasure method for a slab track according to any one of claims 1 to 5, wherein a cover is provided outside the first heat insulating material.   The slab track frost damage countermeasure method according to claim 6, wherein the cover is a formwork. A slab track having a track slab and a packed bed below the track slab,
A slab track, wherein a first heat insulating material is disposed outside an end of the packed bed in the track width direction.   The slab track according to claim 8, wherein a second heat insulating material is disposed outside the packed bed at a corresponding planar position between ends of the track slab adjacent in the track direction. . The track slab is a frame-type track slab provided with an opening in a plane,
The slab track according to claim 8 or 9, wherein a third heat insulating material is disposed on the opening side of the packed bed.   The slab track according to any one of claims 8 to 10, wherein the first heat insulating material is disposed outside a deteriorated portion due to frost damage at an end portion in the track width direction of the packed bed. .   The slab track according to any one of claims 8 to 11, wherein the first heat insulating material is disposed so as not to protrude from an end of the track slab in the track width direction.   The slab track according to any one of claims 8 to 12, wherein a cover is provided outside the first heat insulating material.   The slab track according to claim 13, wherein the covering is a formwork.

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