JP2001271301A - Bearing-capacity reinforcing structure of railway sleeper and method of reinforcing bearing capacity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce irregularity in height of a track in a sleeper bearing- capacity reinforcing structure. SOLUTION: The railway sleeper bearing-capacity reinforcing structure 10 is composed of normal sandbags 11, high-strength sandbags 12, sleepers 1 and ballasts 3. A plurality of the normal sandbags 11 are spread all over the whole surface of the excavated section 15 of a subgrade 4, and form a part of the subgrade 4. A plurality of the high-strength sandbags 12 are heaped up on the normal sandbags 11, and form a part of the ballast 3. The normal sandbag 11 and the high-strength sandbag 12 minimally constrain the movement of crushed stones on the insides, and the crushed stones on the insides intend to cubically expand in the case of the reception of train load, constraint stress is increased because the sandbags 11 and 12 receive constraint reaction by bags, and shear strength is augmented. Accordingly, even when the sleeper 1 repeatedly receives train load, the settlement of the sleeper 1 can be prevented. The irregularity in the height of the track is inhibited particularly at a smaller value by the subgrade biting preventive working of the normal sandbag 11 and the high-strength sandbag 12 installed into the subgrade 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method for reinforcing a railway sleeper.

[0002]

2. Description of the Related Art Conventionally, as a support structure for a railway sleeper, as shown in FIG. 6, a trackbed 3 formed by spreading ballasts 2 so as to cover the periphery of a sleeper 1 is formed on a roadbed 4. Widely known. here,
The sleeper 1 has rails 5 and 5 fastened on its upper surface and supports a train load passing through the rails 5 and 5. In addition, track bed 3
Has a function of holding the sleeper 1 at a predetermined position and widely distributing the train load that passes repeatedly over the roadbed 4.

[0003] By the way, in such a railway sleeper support structure, when a train repeatedly travels, the ballast 2 forming the roadbed 3 moves laterally from under the sleeper 1 due to the repeated load of the train. In some cases, the track may be cut into the roadbed 4 and the height of the track may be deviated. For this reason, when the height of the trajectory becomes irregular, the ballast 2 is refilled or the roadbed 3 is compacted to correct it.

[0004]

However, since the work of correcting such irregularities in the track requires a great deal of labor and cost, there is a demand for the development of a structure in which the irregularities of the track are less likely to occur. As one idea, as shown in FIG.
A plurality of high-strength sandbags containing crushed stones are arranged on the roadbed 4, and on the high-strength sandbags 12,
And a high-strength sandbag 12 forming a part of the roadbed by reinforcing the ballast 2 so as to cover the periphery of the sleeper 1 so that the supporting structure 60 of the railway sleeper can be considered. .

[0005] According to the support reinforcing structure 60, the high-strength sandbag 12 wraps the crushed stone therein to restrain the movement of the crushed stone to a minimum. In addition, when subjected to an external force, the crushed stone tends to expand in volume due to the dilatancy effect, and is subjected to a restraining reaction force by the bag, so that the restraining stress increases and the shear strength sharply increases. As a result, the supporting force against the train load is improved, and the irregularity of the track is reduced.

[0006] However, in the support reinforcing structure 60, the frequency of the correction work is reduced because the height of the track is less irregular than in the case where the high strength sandbag 12 is not used, but the labor and cost of the correction work are large. In view of the above, it has been desired to further reduce the fluctuation.

SUMMARY OF THE INVENTION An object of the present invention is to meet such a demand, and an object of the present invention is to provide a railroad sleeper support structure having a track with a very small deviation in height. It is another object of the present invention to provide a method for constructing the support reinforcing structure.

[0008]

Means for Solving the Problems and Effects of the Invention In order to solve the above-mentioned problems, a railway sleeper reinforcing structure of the present invention is provided with a plurality of first reinforcements including crushed stones spread on an excavated portion where a roadbed is excavated. A bag, a plurality of crushed stone-containing second reinforcement bags stacked in the plurality of first reinforcement bags, and placed on the plurality of second reinforcement bags via a ballast or without a ballast And a track bed formed by laying a ballast so as to surround the sleeper, the first reinforcing bag forms a part of the roadbed, and the second reinforcing bag is It is characterized by forming a part of the track bed.

In the present invention, the rail is fixed to the upper surface of the sleeper, and the train load transmitted from the rail is widely distributed on the roadbed by the sleeper. The sleeper is placed on the second reinforcing bag with or without a ballast. The second reinforcing bag wraps the crushed stone inside, thereby restraining the movement of the crushed stone to a minimum, and when subjected to an external force, the crushed stone tries to expand its volume by the dilatancy effect, and the bag prevents the crushed stone from expanding. Due to the force, the restraint stress increases and the shear strength increases. As a result, even if the sleeper is repeatedly subjected to the train load, the sleeper is prevented from sinking from its original position.

When a ballast is interposed between the sleeper and the second reinforcing bag, the ballast is restrained by including the frictional force by being sandwiched between the sleeper and the second reinforcing bag. It is considered that the behavior is similar to that of the crushed stone inside the second reinforcing bag. Therefore, regardless of whether or not a ballast is interposed between the sleeper and the second reinforcing bag, substantially the same sleeper settling prevention effect is exerted.

Further, the first reinforcing bag is spread over the excavated portion where the roadbed has been dug, and similarly to the second reinforcing bag, the movement of the crushed stone is increased and the shear strength is increased, so that the sleeper can be trained for a long time. The second when the load is repeatedly received
It prevents the reinforcing bags from digging into the roadbed, which further prevents the sleepers from sinking.

As described above, according to the present invention, even if the sleeper is repeatedly subjected to the train load for a long period of time, the sleeper settling preventing action by the second reinforcing bag and the second reinforcing bag by the first reinforcing bag are prevented. By the roadbed biting prevention action, the irregularity of the track can be extremely reduced.

[0013] The support structure of the railway sleeper according to the present invention is constructed by the following procedure. That is, first, a plurality of first reinforcing bags containing crushed stones are spread over an excavated portion where a roadbed is excavated, so that the first reinforcing bags form a part of the roadbed, and crushed stones are placed on the plurality of first reinforcing bags. Pile a plurality of second reinforcement bags containing, put a sleeper on the plurality of second reinforcement bags via ballast or without ballast, and then lay ballast around the sleeper A track bed is formed such that the second reinforcing bag forms part of the track bed.

According to this procedure, the structure for reinforcing a railway sleeper according to the present invention can be easily constructed. In addition, it is preferable that the first reinforcing bag or the second reinforcing bag is spread and then compacted (to fill the gaps between the crushed stones by applying vibration from above) in order to prevent the settling of sleepies.

In the present invention, the plurality of first reinforcing bags are preferably connected to each other. In this case, even if one of the plurality of first reinforcing bags receives a load, not only the loaded first reinforcing bag but also the surrounding first reinforcing bags. Since the load is also transmitted, subsidence hardly occurs. The bags may be directly connected to each other with a string or the like, but the bags may be integrated by surrounding the plurality of bags with a band-like material, and this case is also included in the “connection” of the present invention. . Further, a plurality of second reinforcing bags may be connected to each other for the same reason.

In the present invention, the crushed stone to be packed in each reinforcing bag may be any crushed stone. Examples of the crushed stone include ballast for a roadbed used in a railway, a crushed crushed stone having a certain degree of uniformity, Artificial stones artificially made of ceramics and the like can be given. In addition, the bag body of each reinforcing bag may be any bag body, but if it is too large, initial settlement tends to be large, so that it is large enough to be carried by human power, for example, when packed with crushed stone. A bag having a length of 30 to 80 cm and a height of 10 to 20 cm is preferred.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the railway sleeper supporting structure according to the present embodiment. The railway sleeper supporting capacity reinforcing structure 10 of the present embodiment includes a normal sandbag 11 as a first reinforcing bag and a high-strength sandbag 1 as a second reinforcing bag.
2, a sleeper 1 and a track bed 3.

The ordinary sandbag 11 is prepared by packing a No. 5 crusher oran (crushed crushed stone having a particle size of about 20 mm) into a resin-free knitted bag, so that it is approximately 40 cm long × 40 cm wide.
× The height was 10 cm. FIG. 1 shows the width of the ordinary sandbag 11.

The ordinary sandbag 11 covers the roadbed 4 by about 10 cm.
A plurality of digging parts 15 formed by digging are laid all over. The upper surface of the ordinary sandbag 11 substantially coincides with the upper surface of the surrounding roadbed 4 and forms a part of the roadbed 4. Further, in the ordinary sandbag 11, adjacent corners (or sides) are connected to each other by a string 11a.

The high-strength sandbag 12 is made of ballast ballast (having a grain distribution in the range of 10 to 60 mm) usually used for railways, and geotextile (mesh 1. 5cm, breaking strength 9-1
0t / m), it is approximately 60cm in length x 3 in width.
The size was 5 cm × height 10 cm. FIG. 1 shows the width of the high strength sandbag 12.

A plurality of the high-strength sandbags 12 are stacked on the ordinary sandbag 11 within the range of the width of the sleeper 1 on the longitudinal side, and are stacked above the roadbed 4. Sleeper 1
Are mounted on a plurality of high-strength sandbags 12 through ballasts 2. This sleeper 1 has rails 5
5 is fastened to support the train load passing through the rails 5 and 5 and to spread the train load widely on the roadbed 3. The size of the sleeper 1 is, for example, 30 cm long × 210 cm wide × 14 c high in the case of a large sleeper.
m, and the width of the sleeper 1 is shown in FIG.

The roadbed 3 is formed by laying a ballast 2 on a roadbed 4 so as to cover the periphery of the sleeper 1. The roadbed 3 plays a role of widely and evenly distributing the train load transmitted to the sleeper 1 to the roadbed 4. Next, a procedure for constructing the railway sleeper reinforcement structure 10 of the present embodiment will be described with reference to FIGS. First, for the conventional railway sleeper support structure 50 shown in FIG. 2A, a section of a little over 10 m in the longitudinal direction of the rails 5, 5 is defined as one construction section.
Are released from the rails 5 and 5, and the ballast 2 forming the roadbed 3 is also removed. As a result, FIG.
As shown in the figure, the rails 5 and 5 in this construction section are floated, and the roadbed 4 corresponding to the ground of this construction section is excavated by an excavator such as a backhoe to form an excavation part 15 having a depth of about 10 cm. Roll the top.

Thereafter, as shown in FIG. 2 (c), a plurality of ordinary sandbags 11 are spread over the entire surface of the excavated portion 15, and adjacent corners (or sides) are connected to each other with a string 11a. Then, a compactor (not shown) applies vibration from above to perform compaction, and the upper surface of the ordinary sandbag 11 and the upper surface of the surrounding roadbed 4 are made to substantially coincide with each other. As a result, the ordinary sandbag 11 forms a part of the roadbed 4.

Subsequently, as shown in FIG. 2D, a plurality of high-strength sandbags 12 are stacked on the plurality of ordinary sandbags 11.
Here, the high-strength sandbags 12 are stacked within the range of the width of the sleeper 1 on the longitudinal side. Then, similarly to the ordinary sandbag 11, rolling is performed. Thereafter, as shown in FIG. 2 (e), the sleeper 1 and the rails 5 and 5 are fastened, and the ballast 2 is inserted into the space (about 10 cm in height) between the sleeper 1 and the high strength sandbag 12.
Input. As a result, the sleeper 1 has a high strength sandbag 12
On the ballast 2 via the ballast 2.

Finally, a ballast 2 is laid so as to cover the periphery of the sleeper 1 to form a roadbed 3, and the roadbed 3 is squeezed by a tamper (not shown) in order to prevent initial settlement by passing through the train. Thereby, the railway sleeper reinforcement structure 10 of the present embodiment shown in FIG. 1 is completed.

Next, an example of use of the railway sleeper reinforcement structure 10 of the present embodiment will be described. Here, this railway sleeper bearing capacity reinforcing structure 10 was applied to a business line with 48 average trains passing each day, and the relationship between the elapsed time and the amount of settlement in the applicable section was investigated.

The amount of settlement was measured using an inspection vehicle 30 shown in FIG. That is, the inspection vehicle 30 is a three-car, one-car train, and has a track equipment test vehicle 31 of the three bogie type in the center, and the track equipment test vehicle 31 has trucks 32, 33, 34, and these carts 32, 3
Laser rangefinders 32a, 33a, 34a are provided independently of the bottom of the vehicle in front, center, and rear of the vehicle bottom. Then, each of the laser distance meters 32a, 33
a, 34a, measure the distance from the vehicle body to the rail top surface, and connect a string (1) connecting the front measurement position and the rear measurement position.
0m) was defined as the displacement of the central measurement position.

As a comparative example, as shown in FIG. 5, a high-strength sandbag 12 is installed in the track bed 3 but the ordinary sandbag 11 is not installed in the roadbed 4, and the railway sleeper support structure 60 is installed on the same business line. And the amount of settlement was measured in the same manner. The measurement results are shown in the graph of FIG. As can be seen from this graph, the initial settlement amount one month after the start of application was 3 mm in both the present embodiment and the comparative example, whereas the settlement amount after three months was 3 mm in the present embodiment. In the comparative example, it was 4.6 mm. The amount of settlement after 6 months was 4 mm in the present embodiment, but 5.8 mm in the comparative example. That is, when the amount of settlement after 6 months from the start of application was observed, the present embodiment could be suppressed to about 70% of the comparative example.

It is considered that the subsidence reduction effect of the present embodiment is obtained by the following operation. That is, the ordinary sandbag 11 and the high-strength sandbag 12 restrain the movement of the crushed stone inside to a minimum, and when the train is loaded, the crushed stone inside tries to expand its volume by the dilatancy effect, and is restrained by the bag. Due to the reaction force, the restraint stress increases and the shear strength increases. As a result, it is considered that even if the sleeper 1 repeatedly receives the train load, the sleeper 1 is less likely to sink from its original position. In particular, it is considered that the irregularity of the track is suppressed to be smaller than that of the comparative example by the action of preventing the high-strength sandbag 12 from biting into the roadbed by the ordinary sandbag 11 provided in the base 4.

The ballast 2 interposed between the sleeper 1 and the high-strength sandbag 12 is restrained by being sandwiched between the sleeper 1 and the high-strength sandbag 12, and is the same as the crushed stone inside the high-strength sandbag 12. It is considered that such behavior is taken. Therefore, regardless of whether the ballast 2 is interposed between the sleeper 1 and the high-strength sandbag 12, the same effect of preventing sleeper subsidence is obtained.

By the way, in the conventional railway sleeper supporting structure 50 (see FIG. 6) which does not employ the reinforcing structure, after correcting the irregularity of the track by tamping with a multiple tie tamper, the sinking amount is 20 mm after half a month. And the correction work had to be performed frequently.

The embodiments of the present invention are not limited to the above-described embodiments, and it goes without saying that various embodiments can be adopted as long as they fall within the technical scope of the present invention. For example, in the above embodiment, the high-strength sandbags 12 are installed within the range of the width of the sleeper 1 on the longitudinal side.
It may be installed only directly below. In this case, the same effect as in the above embodiment can be obtained.

Further, adjacent high strength sandbags 12 may be connected to each other. In this case, even if one high-strength sandbag 12 receives a load locally, the load is transmitted not only to the loaded high-strength sandbag 12 but also to the surrounding high-strength sandbags 12, and subsidence occurs. It is even less likely to occur.

Furthermore, in the above embodiment, the ordinary sandbags 11 and the high-strength sandbags 12 are arranged in one layer, but may be stacked in multiple layers. Furthermore, although the ballast 2 is interposed between the sleeper 1 and the high-strength sandbag 12 in the above embodiment, the ballast 2 may be directly contacted without the ballast 2.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a railway sleeper reinforcement structure according to an embodiment.

FIG. 2 is a construction process diagram of a railway sleeper reinforcement structure of the present embodiment.

FIG. 3 is a schematic explanatory view of an inspection vehicle.

FIG. 4 is a graph showing a change in a settlement amount with respect to an elapsed time.

FIG. 5 is a cross-sectional view of a railway sleeper supporting structure according to a comparative embodiment.

FIG. 6 is a cross-sectional view of a conventional railway sleeper support structure.

[Explanation of symbols]

1 ... sleeper, 2 ... ballast, 3 ... track,
4 ... roadbed, 5 ... rail, 10 ... railway sleeper support capacity reinforcement structure, 11 ... ordinary sandbag, 11a ...
String, 12 ... high strength sandbag, 15 ... excavated part, 30
・ ・ Inspection vehicle, 31 ・ ・ ・ Track test vehicle.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Kachi 1-4-1 Meieki Station, Nakamura-ku, Nagoya City, Aichi Prefecture Inside Tokai Passenger Railway Co., Ltd. (72) Inventor Masaru Tateyama 2--8 Hikarimachi, Kokubunji-shi, Tokyo No. 38 Inside the Railway Technical Research Institute (72) Inventor Kenichi Kojima 2-8 Hikarimachi, Kokubunji-shi, Tokyo Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor Gen Matsuoka 4-8 Higashiyamacho, Kasugai-shi, Aichi Prefecture -14 F term (reference) 2D056 AA03

Claims (4)

[Claims] 1. A plurality of crushed stone-containing first reinforcement bags laid on an excavated portion of a roadbed, and a plurality of crushed stone-containing second reinforcement bags stacked on the plurality of first reinforcement bags. And a sleeper mounted on the plurality of second reinforcing bags via a ballast or without a ballast, and a track bed formed by laying a ballast around the sleeper. The first sleeper bag forms a part of the roadbed, and the second reinforcement bag forms a part of the track bed. 2. The railway sleeper supporting force reinforcing structure according to claim 1, wherein the first reinforcing bags are connected to each other. 3. A crushed stone-filled first excavation part for excavating a roadbed
A plurality of reinforcing bags are laid so that the first reinforcing bag forms a part of the roadbed, a plurality of crushed stone-containing second reinforcing bags are stacked on the plurality of first reinforcing bags, and the plurality of second reinforcing bags are stacked. (2) A sleeper is placed on a reinforcing bag via a ballast or without a ballast, and a ballast is laid so as to surround the sleeper to form a roadbed, and the second reinforcing bag is provided on the roadbed. The method of reinforcing railway sleeper bearings, characterized in that they form part of a railway sleeper. 4. The method of reinforcing a railway sleeper according to claim 3, wherein the first reinforcing bags are connected to each other when the plurality of first reinforcing bags are spread over the excavation portion.