JP5209546B2 - Construction method of the structure under the track - Google Patents

Description

  The present invention relates to a method for constructing a structure in the ground under a track.

Conventionally, as a method for constructing a structure in the ground below a railway track, an open-cut method using a construction girder and a non-open-cut method using a steel element inserted into the ground to form a main body structure are known.
FIGS. 3A and 3B are diagrams for explaining an excavation method using a construction girder. FIG. 3A is a cross-sectional view and FIG. 3B is a plan view.
This construction method forms a retaining wall by receiving a construction girder 2 that receives a track (rail) 1 by a plurality of piles 10 constructed along the track, and then constructing a large number of retaining piles 13 made of H-shaped steel or the like. The structure 5 is constructed in the excavated area by excavating the ground 3 surrounded by the retaining wall. In this example, a sidewalk and a roadway are formed in the structure 5. In the figure, reference numeral 11 denotes a fulcrum made of a rubber shoe or the like interposed between the construction beam 2 and the pile 10.

FIG. 4 is a diagram for explaining a non-open cutting method in which a steel element is inserted into the ground to form a main body structure. Such a method is disclosed in, for example, the following patent documents.
Although illustration is omitted, after excavating the start shaft and the reaching shaft and constructing the earth retaining work, respectively, the start vertical shaft side while excavating and discharging the steel element 7 in the ground 3 below the rail 1 and excavating the soil inside Are inserted sequentially from the top to the end of the shaft. The elements are connected by a joint, and adjacent elements are sequentially inserted using a joint of the existing elements as a guide, and concrete is placed in and between the elements, and a region surrounded by the elements is excavated. Thus, the underground structure 5 having the steel element as the main body structure is formed. In this example, a sidewalk and a roadway are formed in the structure 5. In the figure, 9 is a ballast constituting the track 1.

  JP 2005-282115 A

  However, in the above-mentioned open-cut method using construction girders and the non-open-cut method in which steel elements are inserted into the ground to make the main body structure, the work period is prolonged because there are many work types that are limited to the time when the track is closed at night. As a result, there was a problem that the construction cost was increased. For example, in the excavation method using construction girders, there are many operations that are performed during the night time when the track is closed, such as constructing piles that receive construction girders or retaining piles. The construction of the elements had to be done within the night time when the track was closed, and it was difficult to shorten the construction period by either method.

The present invention is intended to solve the above-mentioned problems, and by reviewing the work type and construction sequence that require work time of the crossing structure under the track, safety and workability are improved, and the crossing under the track is performed. The purpose is to shorten the construction period.
The construction method of the under-track structure of the present invention is a step of constructing a construction girder that receives a track,
Inserting the side wall element into the track base plate below the work girder and replacing the work girder at the left and right side wall parts constructed by placing concrete,
It is characterized by excavating between the left and right side walls below the construction girder and constructing an upper floor slab and a lower floor slab.
Further, the present invention is characterized in that the construction girders are short span construction girders, and the construction girders are connected and made continuous, and the short span construction girders are respectively received by the left and right side wall portions.
Further, the present invention is characterized in that the construction girder has a long span, receives the construction girder at the left and right side walls, and constructs the construction girder pile between the left and right side walls to receive the construction girder.

  The present invention inserts a side wall element and casts concrete, and after exchanging the construction girder at the constructed left and right side wall parts, excavating the inside of the left and right side wall parts below the construction girder, By constructing, it is possible to increase the types of work within business hours without shortening the work period without constructing support piles and retaining piles.

It is a figure explaining the construction method of this embodiment using a steel element. It is a figure explaining the other example of this embodiment. It is a figure explaining the excavation method by a construction girder. It is a figure explaining a non-cutting method.

Embodiments of the present invention will be described below.
FIG. 1 is a diagram for explaining a construction method according to this embodiment using a steel element.
Although illustration is omitted, depending on the situation at the site, excavation shafts and reaching shafts are excavated and earth retaining works are respectively constructed. As shown in FIG. 1 (a), the short span construction girders 21 and 22 are constructed directly on the ground of the construction site 30 of the underground structure or by providing a simple support material (not shown), and the track 1 Protect. Reference numeral 23 denotes an opposite portion of the short span construction girders 21 and 22. Next, steel elements 31 and 31 for configuring the left and right side walls are inserted into the track base plate from the starting shaft side to the reaching shaft side (FIG. 1 (b)) and filled with concrete to make steel. A side wall 33 made of elements is constructed (FIG. 1 (c)). At this time, the short span construction girders 21 and 22 are installed on the roadbed at the upper part of the left and right side walls made of steel elements, and are composed of rubber shoes or the like between the construction girders and the left and right side wall parts for height adjustment. A support part 34 in which concrete is placed or a steel material is sandwiched is inserted, and the construction girder is exchanged by the left and right side wall parts 33. Since the construction girders 21 and 22 are supported by the left and right side wall portions, the construction girders 20 are connected by connecting them with an attachment plate or the like at the facing portions 23 to form the construction girders 20. Next, the upper floor slab concrete 35 is constructed by first excavating the lower part of the work girder (FIG. 1 (d)), and further, the lower floor slab concrete 37 is constructed by performing the second excavation (FIG. 1 (e)). After the upper floor slab and the lower floor slab are constructed, the construction girder is removed to construct the underground structure (FIG. 1 (f)), but the construction girder may be left as the main construction girder. In the above, the first excavation and the upper floor slab were constructed, and then the second excavation was performed to construct the lower floor slab. A plate may be constructed. Also, two construction girders with short spans were used, but three or more may be used if the distance between the left and right side walls is large, and depending on the situation, one with a single continuous span may be used. It may be.

  In this embodiment, it is necessary to install the construction girder when the track is closed. However, the side wall can be installed even during commercial operation. First, the side wall is constructed to support the construction girder, and the side wall is fixed to the earth retaining wall. Since the upper floor slab and lower floor slab can be constructed by excavating the interior as a wall, it is no longer necessary to perform construction girder piles, retaining piles, etc., and most work can be done during commercial operation, shortening the construction period Can be planned.

FIG. 2 is a diagram for explaining another example of the present embodiment, and is a diagram for explaining a construction method applied when the span of the underground structure is long and the ground is good (the support layer is shallow).
Although illustration is omitted, depending on the situation at the site, excavation of the start shaft and the reaching shaft and construction of the earth retaining works are the same. As shown in FIG. 2A, a long construction girder 20 is constructed directly on the ground of the construction site 30 of a long span underground structure or by providing a simple support material (not shown), and the track 1 is Protect. Next, steel elements for configuring the left and right side wall portions from the starting shaft side to the reaching shaft side are inserted into the ground under the track and filled with concrete, and the left and right side wall portions 40 are constructed. Next, it is made of rubber shoes between the work girder and the left and right side wall parts 40, and a concrete part is placed for height adjustment or a support part 41 with steel material sandwiched is inserted, and the side wall part is used as a support. While changing a girder, the pile 43 which receives a construction girder is constructed in the intermediate position of a right-and-left side wall part (FIG.2 (b)). Next, the lower excavation girder is primarily excavated and upper floor slab concrete 45 is constructed (FIG. 1 (c)), and further, the lower excavation concrete 47 is constructed (FIG. 1 (d)). After the upper floor slab and the lower floor slab are constructed, the construction girders and support piles are removed to construct the underground structure (FIG. 2 (e)), but the construction girders may be left as permanent construction girders. Also, in the above, after the first excavation and the upper floor slab was constructed, the second excavation was performed to construct the lower floor slab. You may make it construct upper floor slab concrete.

  Also in this embodiment, the construction of the side wall part is possible even during commercial operation. First, the side wall part is constructed to support the construction girder, the construction girder pile is constructed between the side wall parts, and the side wall part is used as a retaining wall. Since the upper floor slab and lower floor slab can be constructed by excavating the interior, it is not necessary to construct earth retaining piles, etc., and it is possible to carry out most of the construction during commercial operation, thereby shortening the construction period.

  Since the present invention can increase the types of work within business hours without constructing support piles and retaining piles, it can be used for under-track crossing methods that shorten the construction period and improve safety and workability. be able to.

DESCRIPTION OF SYMBOLS 1 ... Track, 3 ... Ground, 20, 21, 22 ... Construction girder, 33, 40 ... Side wall part, 35, 45 ... Upper floor slab, 37, 47 ... Lower floor slab.

Claims (3)

The stage to construct the construction girder that receives the track,
Inserting the side wall element into the track base plate below the work girder and replacing the work girder at the left and right side wall parts constructed by placing concrete,
Drilling between the left and right side walls below the construction girder and constructing the upper and lower floor slabs,
The construction method of the structure under the track having 2. The under-track structure according to claim 1, wherein the construction girder is composed of a short-span construction girder, and the construction girder is connected and continuous, and each short-span construction girder is received by the left and right side walls . How to build . 2. The under-track structure according to claim 1, wherein the construction girder has a long span, receives the construction girder at the left and right side wall portions, and constructs the construction girder pile between the left and right side wall portions to receive the construction girder. Construction method.

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