JP2007002411A - Track construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a track construction method for easily switching a support from steel girders to permanent girder. <P>SOLUTION: The track construction method is for use in switching the temporary support of a track 1 which is set up by temporarily supporting sleepers 3 having rails 2, 2 mounted thereon by the steel girders 4, 4, etc., to the support by the permanent girders 5. By the method, a plurality of mounts 7 each having an elastic bearing 6 with the upper surface separated from the lower surface of each steel girder 4, are arranged under the steel girders 4 at intervals in a steel girder 4 extending direction. Then concrete is placed at least on the periphery of each steel girder 4 around the mount 7 to form a preceding girder 5a, a temporary beam 10 of each steel girder 4 is removed, and the permanent girder 5 is supported by the mount section 7 via the elastic bearing 6. Then, concrete is further placed around the steel girder 4 where the temporary beam 10 has been set, and thus the construction of the permanent girders 5 is completed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a track construction method for switching a track temporarily laid on a steel girder to support by a main girder when performing an elevated track construction or vibration suppression construction.

  Conventionally, when constructing underpasses, station buildings, underground shopping streets, etc. under the railroad track, the track is temporarily supported by a steel girder provided adjacent to the place where the permanent girder is constructed, and the permanent girder is completed. A method of switching the trajectory later is known (see Patent Document 1).

  In this method, the steel girder that temporarily supported the track was removed at the time of switching to the main girder, and the work was carried out by laying ballast or the like on the main girder and laying the track on it.

Patent Documents 2 and 3 disclose vibration-proof structures that prevent vibrations generated when a rail vehicle travels on a rail from being transmitted to a structure that supports the track.
JP 50-94713 A Japanese Patent Laid-Open No. 8-31801 JP-A-8-31802

  However, the above-mentioned track construction method requires a removal work to remove the steel girder used during the construction, and the steel girder damaged by cutting during the removal work cannot be reused and discarded. It had been.

  Then, this invention aims at providing the construction method of the track | orbit which can perform switching from a steel girder to a permanent girder easily.

  To achieve the above object, the present invention provides a track construction method for switching a track on which a sleeper on which a rail is placed is temporarily supported by a steel girder to support by a main girder, A plurality of pedestal portions each having an elastic bearing portion formed with an upper surface spaced apart from each other at intervals in the extending direction of the steel girder, and at least concrete is placed around the steel girder around the pedestal portion, Forming a part of a permanent girder, removing the temporary support part of the steel girder and supporting the permanent girder on the pedestal part via the elastic support part, the temporary support part was installed The track construction method is characterized in that concrete is cast around a steel girder to complete the main girder.

  Here, the pedestal portion is formed with a recess facing the side surface of the permanent girder by a wall erected from the bottom plate on which the elastic support portion is installed, and the side surface of the permanent girder is accommodated in the concave portion. Protruding portions can be provided.

  The track construction method of the present invention configured as described above is to construct a permanent girder by placing concrete around a steel girder that has temporarily supported the track, and the permanent girder is interposed through an elastic bearing. To support the structure.

  For this reason, it is not necessary to remove the steel girder, and since the main girder is supported by the elastic bearing portion, the vibration damping effect is great.

  Further, by engaging the protrusion provided on the permanent beam with the concave portion provided on the pedestal, it is possible to prevent a deviation in the extending direction and the transverse direction of the permanent beam.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 6 is a plan view of a state in which the track 1 is laid on the main beam 5 constructed by the track construction method of the present embodiment.

  First, the configuration of the track 1 according to the present embodiment will be described. The track 1 is for placing two rails 2 and 2 laid in parallel and the rails 2 and 2 as shown in FIG. As shown in FIG. 6, the sleepers 3,... As elastic sleepers installed at intervals in the extending direction of the rails 2, 2, and the fasteners 2a for fixing the rails 2, 2 to the sleeper 3.・ ・ Mainly composed of

  The track 1 is supported by steel girders 4... During construction and is supported by the main girder 5 after construction.

  The steel girder 4 is made of a steel material such as an H-shaped steel material, and the main girder 5 is formed by placing concrete around the steel girder 4.

  Further, as shown in FIG. 2, the steel girders 4,... Are supported by temporary beam portions 10, 10 serving as temporary support portions that are provided at intervals in the extending direction of the track 1.

  The temporary beam portion 10 is a member formed of H-type steel material or the like, and as shown in FIG. 3, as shown in FIG. 11 is bridged between the upper end surfaces.

  Further, the permanent girder 5 that supports the track 1 after the construction is supported by a beam portion 9 constructed of reinforced concrete or the like via pedestal portions 7 and 7, as shown in FIG.

  The pedestal portions 7 and 7 installed on the upper surface of the beam portion 9 are formed in an L shape in cross section as shown in FIG. 1, and a pair is installed facing each other.

  The pedestal portion 7 includes a plate-like bottom plate 7a to be brought into contact with the upper surface of the beam portion 9, side walls 7b erected from one end of the bottom plate 7a, and both sides of the side walls 7b as shown in FIG. It is mainly comprised by the retaining walls 7c and 7c provided in this.

  The pedestal portion 7 can be directly constructed of reinforced concrete by assembling a formwork on the upper surface of the beam portion 9, but may be installed in advance by a factory or the like.

  On the upper surface of the bottom plate 7a, for example, two elastic support portions 6 formed in a rectangular shape by an elastic material such as an anti-vibration rubber, a compression coil spring, and a leaf spring are installed as shown in FIG. ... the main girder 5 is placed on the top.

  Further, as shown in FIGS. 2 and 5, in the concave portion 7 d formed by the side wall 7 b and the retaining walls 7 c and 7 c, a protruding portion 5 b that protrudes from the side surface of the main girder 5 in the extending orthogonal direction of the track 1. Be contained.

  Further, a cushioning material 8 such as rubber is interposed between the side surface of the protruding portion 5d and the side wall 7b and the retaining walls 7c, 7c so that these members do not come into direct contact with each other.

  Next, the track construction method of the present embodiment will be described.

  FIG. 2 is a plan view showing a state where both the temporary beam portions 10 and 10 for supporting the steel girders 4... And the beam portions 9 and 9 for supporting the main beam 5 are arranged. In this previous stage, there is a state in which the beam portions 9 are not constructed.

  In order to be in the state as shown in FIG. 2, first, a portal-type support structure is constructed by the temporary column parts 11, 11 and the temporary beam part 10 as shown in FIG. 3 (cross-sectional view taken along line AA in FIG. 2) The steel girders 4, ... are arranged in parallel on it.

  And the sleepers 3, ... installed at intervals in the extending direction of the steel girders 4, ... are fixed to the steel girders 4, ... via the connecting portion 4a.

  Furthermore, on the sleepers 3,..., Rails 2 and 2 are placed in the same direction as the extending direction of the steel girders 4,.・ Fix through.

  The track 1 laid in this way is supported by the steel girders 4,... At this time, and the load of the track 1 does not act on other parts. The beam portions 9 and 9 can be constructed.

  As shown in FIG. 6, the beam portions 9 are provided at intervals in the extending direction of the track 1, and both ends thereof are supported from below by the main column portions 12, 12, and the vertical beam portions 13,. The other beam 9 is connected by

  And as shown in FIG. 4 (BB sectional drawing of FIG. 2), a pair of base parts 7 and 7 are installed in the upper surface of this beam part 9 so that it may face each other.

  The upper surface of the elastic support portion 6 attached to the bottom plate 7a of the pedestal portion 7 is in a positional relationship so as to be separated from the lower surface of the steel girder 4. At this stage, the pedestal portion and the steel girder 4,. 7 and 7 are not connected and the load of the steel girders 4... Does not act on the pedestals 7 and 7 side.

  Next, concrete is placed around the steel beams 4,... Excluding the portion where the temporary beam portions 10, 10 and the steel beams 4,. As shown, a leading digit portion 5a that forms part of the permanent girder 5 is constructed.

  This leading girder 5a is a part of the main girder 5 including projections 5b and 5b provided on the pedestals 7 and 7, as shown in FIG. The steel girders 4,... And the connecting portion 4a are formed by placing concrete so as not to be exposed.

  When the leading beam portions 5a,... Are formed in this way, the steel beams 4,... Are exposed only around the temporary beam portions 10, 10, as shown in FIG. As shown, on the pedestal portions 7, 7, the lower surface of the leading beam portion 5 a is formed to a position where it abuts or approaches the upper surfaces of the elastic support portions 6, 6.

  However, in this state, the preceding girder portions 5a,... Are still suspended from the steel girders 4,. It is supported by being supported by.

  Therefore, when the temporary beam portions 10 and 10 are removed as shown in FIG. 6, the leading beam portions 5a,... Are placed on and supported by the elastic support portions 6,. The member is switched from the temporary beam portions 10 and 10 to the main beam portions 9 and 9.

  Then, concrete is cast around the steel girders 4,... Exposed by removing the temporary beam parts 10, 10 to construct the following girders 5c,. To complete.

  Next, the operation of the track construction method of the present embodiment will be described.

  The track construction method of the present invention configured as described above is to construct a permanent girder 5 by placing concrete around the steel girders 4,. The girder 5 is supported by the beam portions 9, 9 provided for the main installation through the elastic support portions 6,.

  For this reason, it is not necessary to remove the steel girders 4,... Used as temporary temporary during construction, and the main girders 5 are supported by the elastic bearing parts 6,. The vibration damping effect is great, and the support structure of the track 1 is used as an anti-vibration structure, so that it is possible to suppress the vibration generated by passing through the railway vehicle from propagating to other structures such as adjacent buildings.

  In addition, since the steel girders 4,... Are not cut and removed, there is no waste that is broken and cannot be reused.

  Further, by engaging the projections 5b, 5b provided on the side surface of the permanent girder 5 with the recesses 7d, 7d provided in the pedestal parts 7, 7, there is a shift in the extending direction and the transverse direction of the permanent girder 5. It can be prevented from occurring.

  In addition, the support structure by the elastic support portions 6,... Eliminates the need for laying ballast and facilitates maintenance.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment, the other part excluding the periphery of the steel girders 4,... Where the temporary beam part 10 is installed is first constructed as the preceding girder part 5a. If the preceding girder part 5a is constructed by placing concrete in advance around the steel girders 4,... Positioned at least on the pedestal parts 7, 7, the remaining part is the trailing girder part. It can be constructed as 5c.

  In the above embodiment, the replacement of the track 1 on the elevated structure provided with the temporary beam portion 10 and the beam portion 9 has been described. However, the present invention is not limited to this, and the track 1 is used to construct an underpass or the like. The present invention can also be applied to the case of excavating the lower part of the machine.

  Furthermore, in the said embodiment, although the track | orbit 1 was supported by the four steel girders 4, ..., it is not limited to this, The number and shape of the steel girders 4 can be set arbitrarily. .

  Moreover, although the elastic sleeper was used as the sleeper 3, it is not limited to this, A concrete sleeper, a wooden sleeper, etc. may be sufficient.

It is sectional drawing explaining the structure of the permanent girder which supports the track | orbit of the best embodiment of this invention (CC sectional view taken on the line of FIG. 5). It is a top view explaining the procedure of the construction method of the track | orbit of the best embodiment of this invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2. It is a top view explaining the procedure of the construction method of the track | orbit of the best embodiment of this invention. It is a top view explaining the structure of the track | orbit constructed | assembled by the track construction method of the best embodiment of this invention.

Explanation of symbols

1 Track 2 Rail 3 Sleeper 4 Steel Girder 5 Permanent Girder 5b Protrusion 6 Elastic Bearing 7 Base 7a Bottom Plate 7b Side Wall (Wall)
7c Reservation wall (wall)
7d Concave portion 10 Temporary beam portion (temporary support portion)

Claims (2)

In the track construction method of switching the track on which the sleepers on which the rail is placed are temporarily supported by the steel girders to the support by the main girders,
A plurality of pedestal portions each having an elastic bearing portion formed with an upper surface spaced apart from the lower surface of the steel girder are provided at intervals in the extending direction of the steel girder, and concrete is provided around at least the steel girder around the pedestal portion. Forming a part of the permanent girder, removing the temporary support part of the steel girder, and supporting the permanent girder on the pedestal part via the elastic support part; A track construction method, wherein concrete is placed around the steel girders that have been installed to complete the main girders.   The pedestal is formed with a recess facing the side surface of the permanent girder by a wall erected from the bottom plate on which the elastic support portion is installed, and a protrusion that is accommodated in the concave portion on the side surface of the permanent girder The track construction method according to claim 1, wherein:

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