JP2005232922A - Track concrete slab board of tramcar and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a track concrete slab board of a tramcar for easily and quickly performing exchange working after durable period passage, and to provide its construction method. <P>SOLUTION: The method for constructing the track concrete slab board of the tramcar can obtain a thin and lightweight track concrete slab board 10 at high strength by manufacturing the track concrete slab board 10 of the tramcar of floor slab-like precast prestressed concrete arranging a great number of PC steel materials 12 in the longitudinal direction of a rail, hangs the front part and the rear part of the precast prestressed concrete track concrete slab board 10 without receiving influence of a feeder or the like by a simple portal crane device, moves the portal crane device to move the track concrete slab board up to a prescribed position, and performs laying, exchange or the like of the track concrete slab board 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a track slab plate in a combined track of a tram laid on a road and a construction method thereof.

  Conventionally, the track of a tram has a rail support structure in which sleepers are laid on a road floor made of crushed stone or the like, and rails are attached and fixed on the sleepers. In particular, in the track laid on the road, there are many ones in which a slab is installed between the left and right rails and asphalt pavement is provided between the left and right rails.

  In such a rail support structure for a tram, there is a problem that it takes a lot of time to create a roadbed, the stability of the track is not sufficient, and maintenance is expensive. Furthermore, since the crushed stones and sleepers that support the rails are hidden under the slab and asphalt pavement, it becomes difficult to maintain the track including the rails. In addition, steps of slabs laid on the track, cracks in asphalt pavement, and the like occur, resulting in inferior running safety performance and running comfort performance required for road pavement.

  In order to solve such problems, a track slab plate is made of precast concrete, and a groove is provided in the precast concrete plate to lay the rail, and the rail is embedded and fixed using resin in the groove. (For example, refer nonpatent literature 1).

  In this technology, the track slab is stable without the effort of arranging and maintaining sleepers on the roadbed formed of crushed stone, etc., so that the maintenance work is also reduced, and rail laying, There is an advantage that maintenance is easy.

  However, the precast reinforced concrete track slab requires a thick wall and a large weight in order to ensure its strength. For this reason, large heavy machinery is required for handling.

On the other hand, an overhead line is provided above the track slab for powering the traveling train by a pantograph or a pole, which restricts the use of a large crane or the like.
Niigata Iron Works Co., Ltd .: “Resin fixed track INFUND” catalog

  The present invention aims to improve the above-described track slab plate and provide a track slab plate that can be easily laid, removed, replaced, etc. by a simple method and apparatus, and also provides a construction method thereof. .

  In general, the tram slab version of a tram has a service life and needs to be replaced after the service life has elapsed, and the work is limited to a night work of several hours, for example. The present invention makes it possible to perform replacement work easily and quickly during such replacement.

  The present invention has been made to solve the above-described problems, and provides a track slab plate characterized by taking the following technical means. That is, the present invention is a track slab version of a tram, characterized in that it is made of floor slab-like precast prestressed concrete in which a number of PC steel materials are arranged in the longitudinal direction of the rail.

  The track slab plate is preferably made of precast prestressed concrete having a concave groove for fixing the rail to the resin.

  The construction method of the present invention for laying the track slab of the tram of the present invention includes a gate-type frame arranged at the front and rear, and the front and rear portal frames suspend the front and back of the track slab plate made of precast prestressed concrete. A method for constructing a track slab version of a tram, characterized in that the gate-shaped frame is moved to move the track slab plate to a predetermined position and lay it down.

  In this case, the portal frame is provided with movable traveling wheels, and may be coasted by a towing vehicle or the like and may be capable of self-propelling with driving power, but a simple gear device or manual lever device. If it is configured so that it can be moved manually, it can be easily constructed with a simple device, which is preferable.

  Since the track slab version of the tram of the present invention is configured as described above, it has high strength, is thin and lightweight, and can be installed and replaced without using a large crane even if there is a power supply overhead line. Etc. can be constructed quickly in a short period of time.

  Moreover, according to the construction method of the present invention, the replacement work of the track slab can be easily carried out by night work overnight even under conditions where a large crane or the like cannot be used.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the track structure of a conventional tram will be described with reference to FIG. A ballast layer 52 that is tamped and tightly packed is formed on the lower roadbed 51, a sleeper 53 is laid on the ballast layer 52, and a rail 54 is attached on the sleeper 53. A roadbed 55 is formed so as to embed the sleepers 53, and a slab 56 is placed thereon so as to be flush with the rail upper surface. Some stone slabs 56 are provided with asphalt pavement.

  In such a conventional tramway track structure, road subsidence, levitation, deformation, cracking, etc., impairs road running and safety, and these restoration, maintenance, inspection, replacement, etc. Necessary. Since the conventional track structure shown in FIG. 5 is not easy to maintain, the track slab for which the track slab has been developed is laid on the ground with a reinforced concrete slab having a groove for housing the rail. A rail is mounted on the top.

  As a new track structure of a tram, there is a so-called resin fixed track (Infundo) as shown in FIG. 4 developed in Europe using a track slab type. The resin-fixed track adopted so far adopts the concept of concrete road pavement, and as shown in FIG. 4, a continuous reinforced concrete pavement structure in which a large number of reinforcing bars 42 are arranged crossing the roadbed part below the rail 54. 41 is formed and does not use sleepers. In this structure, the reinforced concrete pavement structure 41 becomes a member that resists orbital load and the like, and thus the thickness is increased. Although there is a technique in which such a reinforced concrete pavement structure 41 is used as a precast concrete product, the track slab of such a precast concrete product has a heavy weight per piece and is difficult to handle.

  For example, when constructing a combined tramway for a tram laid on a road, it is necessary to construct it overnight so as not to hinder traffic, especially at a road intersection. For this reason, usually, the track slab is used as a precast member, and after the existing track is removed, work is performed by means of laying a new track slab plate and restoring it. However, in the case of a tram, since there is an overhead line on the track, it is necessary to perform the work with the crane under the overhead line, which makes it difficult to work with the large crane and limits the weight of the track slab plate.

  In general, the axle load of the tram does not exceed 100 kN at the maximum, and is smaller than the design value 100 kN of the axle load of the automobile load. Therefore, the combined track slab of the tram laid on the road can be designed as a road pavement structure in which the automobile load is a design load. As a conventional road pavement, there is a precast prestressed concrete pavement plate (PCaPC pavement plate), and a pavement plate of this structure type can be made thinner and lighter than a pavement plate of a continuous reinforced concrete pavement structure.

  FIG. 1 is a cross-sectional view showing a track slab version 10 of a tram according to an embodiment of the present invention.

  The track slab plate 10 is a pre-tensioned precast prestressed concrete track slab containing a horizontal reinforcing bar 11 and a vertical PC steel material 12, and has a groove 13 on the upper surface for inserting a rail 54 and fixing the resin.

  As shown in FIG. 1, the track slab plate 10 is sufficiently strengthened in the transverse direction with a reinforcing bar or PC steel to ensure sufficient rigidity against bending stress generated in a direction perpendicular to the track longitudinal direction. In addition, since the entire track slab plate 10 can resist the degree of bending stress generated in the track longitudinal direction, the thickness of the track slab plate 10 can be reduced.

  FIG. 2 is a cross-sectional view showing a structure in which the track slab plate 10 shown in FIG. 1 is installed. The backfill material 21 is provided on the lower roadbed 51, the track slab plate 10 is disposed thereon, and the roadbed 23 and the road pavement are provided. 22 is to be constructed. The rail 54 may be configured such that after the track slab plate 10 is laid, a long rail is disposed in the concave groove 13 and the resin is filled in the concave groove 13 to fix the rail. However, it does not exclude that the rails are attached in advance.

  FIG. 3 is a conceptual diagram showing a work process for removing or installing the track slab plate 10 of the present invention, and using a simple portal crane device 31 having a height lower than the power supply overhead line, the track slab plate 10 is suspended. A state in which the lower device 32, the lifting hook 33, and the wire rope 34 are lifted and moved is shown.

  The portal crane device 31 includes wheels on the base portion 35 and travels on the road surface by a drive device 37 or the like. The drive device 37 may be electric, engine drive, or the like, but may be a manual movement device including a gear train, a manual lever, or the like. In addition, it is good also as pulling the portal crane apparatus 31 with another traction apparatus.

  The track slab for trams of the example was examined by the method described above. The thickness of the track slab plate according to each structural type is as follows. It goes without saying that the plate thickness varies depending on the amount of prestress introduced per member cross section.

Track slab version by continuous reinforced concrete pavement (comparative example) Thickness t = 370mm
Track slab version by precast prestressed concrete pavement (Example)
Thickness t = 230-280mm
When the length of the track slab plate 10 is the same as that of the conventional, the weight of the precast prestressed concrete track slab plate is lighter than the weight of the track slab plate by reinforced concrete pavement and is about 60% to 75%. The crane for laying or removing may be of a small capacity, and can be laid and replaced without being obstructed by the overhead power feeding line. In addition, when a crane having the same capacity is used, the plate length of the track slab plate by the precast prestressed concrete pavement can be increased, so that the construction amount per day can be increased and the construction period can be shortened.

It is sectional drawing of an Example. It is sectional drawing of an Example. It is explanatory drawing which shows this invention method. It is sectional drawing of a prior art example. It is sectional drawing of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Track slab plate 11 Reinforcement 12 PC steel material 13 Concave groove 14 Resin 21 Backfill material 22 Road pavement 23 Subbase 31 Gate frame 32 Lifting device 33 Hook 34 Wire rope 35 Base part 36 Wheel 37 Drive device 41 Concrete pavement structure 42 Reinforcing bar 51 Lower class roadbed 52 Ballast 53 Sleeper 54 Rail 55 Roadbed 56 Lithograph

Claims (4)

  A track slab version of a tram, which is made of precast prestressed concrete in the form of a floor slab in which a number of PC steel materials are arranged in the longitudinal direction of the rail.   The track slab version of a tram according to claim 1, wherein the track slab version is made of precast prestressed concrete having a concave groove for fixing the rail to the resin.   A portal frame is arranged at the front and back, the front and rear portal frames suspend the front and back of the track slab plate made of precast prestressed concrete, and the portal frame is moved to move the track slab plate to a predetermined position. The construction method of the track slab version of the tram, characterized by laying.   4. The method for constructing a track slab version of a tram according to claim 3, wherein the portal frame is manually moved with movable traveling wheels.

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