JPH0813420A - End construction of subbase - Google Patents

Abstract

PURPOSE:TO make it possible to avoid installing of a new bridge girder in widening work of a bridge etc., to reduce dead load and, at the same time, to facilitate the conveyance of construction materials in the case of conventional construction work. CONSTITUTION:A precast floor slab 2 for constituting a subbase is installed on a bridge girder 1. A sill block 4 is mounted on the upper surface of the end of the floor slab 2, and in the outside end section 18 of the sill block 4, projected wall sections 20, 20 ... projected outward in the direction of the road width are formed at specific intervals lengthwise of the subbase. Poles 25, 25 ...are buried in the projected wall sections 20, 20 ..., and tie plates 26 are built between the poles 25. A protective member 6 is constituted of the poles 25, 25 ... and tie plates 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end structure of a roadbed applied when forming a roadbed such as a bridge.

[0002]

2. Description of the Related Art Traditionally, the construction of bridges, etc. has traditionally been done by assembling formwork and arranging concrete at the site, and then placing concrete, but recently it has been arranged on steel plates called skin plates. Precast slabs that make a line and concrete is produced in advance in the factory, these precast slabs are laid on the bridge girders on site, and concrete is laid on these joints. Is widely used. In this method, since the floor slab is precast, the amount of work such as on-site formwork production, bar arrangement, concrete placement, etc. is significantly reduced, shortening the construction period compared to the old method, This brings advantages such as labor saving. In addition, a wall body that stands up from the roadbed is provided at an end portion in the width direction of the roadbed such as a bridge in order to prevent a vehicle traveling on the roadbed from departing from the road surface. FIG.
[Fig. 3] is a diagram showing an example of the wall body provided on a roadbed of a bridge. In the figure, 1 is a bridge girder, 2 is a precast floor slab that constitutes a roadbed installed on the bridge girder, and 3 is a wall body provided on the upper surface in the width direction end of the precast floor slab. Wall 3
Is composed of concrete plates 4 and 5 having a predetermined thickness. The concrete plate 4 is called a ground cover, and the concrete plate 5 is called a wall balustrade.

By the way, in recent years, along with the increase in traffic volume, there are many opportunities to perform work for expanding the road width, that is, so-called widening work. The outline of the widening work will be described with reference to FIG. A precast floor slab 8 is installed on the bridge girder 7, a ground cover 9 is installed on the upper surface of the width direction end of the precast floor slab 8, and a wall balustrade 10 is installed on the upper surface of the width direction end of the ground cover 9. There is. In the case of performing the widening work, first, the existing wall balustrade 10 and the ground cover 9 are removed, and in order to secure the space for installing the precast floor slab 11 that is newly installed, the existing precast floor slab 8 is Remove some. After that, the precast floor slab 11 is installed on the bridge girder 7, and the ground cover 12 and the wall balustrade 13 are sequentially installed on the bridge girder 7, thereby completing the widening work.

[0004]

In the widening work shown in FIG. 4, when the precast floor slab 11, the ground cover 12, and the wall balustrade 13 newly installed greatly protrude from the bridge girder 7 to the outside, the precast floor slab 11 Since an excessive bending moment is generated at the joint between the bridge girder and the bridge girder 7, it is necessary to add a new bridge girder 14 to prevent this. At this time, if the bridge girder 14 is added, a large-scale construction is required for that purpose, which increases the work amount and the construction cost and the material cost. In addition, it is desirable to use a lightweight precast floor slab and a wall body at the end of the roadbed that are convenient for transportation in a normal construction work of a bridge and the like, while reducing dead load.

The present invention has been made in view of the above-mentioned problems, and it is possible to avoid installing a new bridge girder in widening construction of a bridge or the like, and reduce dead load in normal construction work. It is an object of the present invention to provide a roadbed end structure that facilitates the transportation of construction materials.

[0006]

The present invention has the following features to attain the object mentioned above. The roadbed end structure according to claim 1, wherein a ground cover block is installed on the upper surface of the end portion in the width direction of the precast floor slab constituting the roadbed so as to extend in the length direction of the roadbed. In the width direction outer end portion, in the end structure of the roadbed in which a protection member extending above the outer end portion and extending in the length direction is installed, at the outer end portion of the ground covering block, A plurality of projecting wall portions projecting outward in the width direction are formed at predetermined intervals in the length direction, and the protective member is installed on these projecting wall portions.

A roadbed end structure according to a second aspect is the roadbed end structure according to the first aspect, wherein the protective member is provided with a plurality of poles provided upright on the protruding wall portion and between the poles. It is characterized in that it is composed of a band-shaped plate body installed.

[0008]

In the end structure of the roadbed according to the present invention, the protection member is installed on the plurality of projecting wall parts projecting to the outer end of the ground covering block. In this case, the weight of the protective member is mainly applied to the protruding wall portion, but since the protective member is generally lightweight, there is no problem in terms of strength. Also,
In the ground covering block, the weight of the space portion between the projecting wall portions is reduced as compared with the conventional case. In the end structure of the roadbed according to claim 2, the protection member is composed of a plurality of poles erected on the projecting wall portion and a strip-shaped plate body installed between these poles, so that the protection member is made of concrete. The weight corresponding to the weight difference between the concrete block and the pole and the strip plate body is further reduced as compared with the case of the block.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are views showing an embodiment of the end structure of the roadbed of the present invention. 1 and 2, the same components as those in FIG. 3 described above are designated by the same reference numerals, and the description thereof will be omitted. First, in FIG. 1, a precast floor slab 2 (hereinafter abbreviated as floor slab) that constitutes a roadbed is installed on a bridge girder 1. A ground covering block 4 is installed on the upper surface of the end portion in the width direction of the floor slab 2 so as to extend in the length direction of the roadbed. At the outer end portion 18 of the ground covering block 4, a plurality of projecting wall portions 20, 20 ... Which project outward in the width direction of the roadbed are formed at predetermined intervals in the lengthwise direction of the roadbed. Further, at the outer end portion 19 of the floor slab 2, the protruding wall portion 2 having the same shape as the protruding wall portion 20 in plan view is formed.
1, 21, ... Are formed so as to project outward in the width direction. The projecting wall portions 20, 20, ... Of the ground covering block 4 are embedded with poles 25, 25 ... so as to project upward, and a strip-shaped plate member 26 (guard rail) is provided between the poles 25, 25. It is constructed by 27, 27 ... The poles 25, 25, ... And the strip-shaped plate member 26 constitute the protection member 6.

FIG. 2 is a view showing a joint structure of the floor slab 2, the ground block 4 and the poles 25, 25 ... In FIG. 2, anchor bolts 30, 30 ... Are embedded in the floor slab 2 so as to project upward at the widthwise end portions. In addition, the anchor bolt 3 is attached to the ground cover block 4.
Insertion holes 31 and 31 so that 0, 30 ...
... are formed and the projecting wall portions 20, 20 of the ground block 4 are ...
Insertion holes 32, 32 ... Are formed so that the poles 25, 25. Insertion holes 31, 31
Concrete is placed in the state where the anchor bolts 30, 30 are embedded, and concrete is placed in the insertion holes 32, 32 while the poles 25, 25 are embedded in the concrete portions 33, 33. And concrete parts 34, 34 ... Are formed.

Next, a method of constructing the above-mentioned roadbed end portion will be described with reference to FIG. First, the floor slab 2 in which the anchor bolts 30, 30 ... Are embedded in advance, and the insertion hole 31,
31 and the ground cover block 4 in which the insertion holes 32, 32 are formed. Next, after carrying these into the site and installing the floor slab 2 on the bridge girder 1 so that the anchor bolts 30, 30 ... Are located at the widthwise end of the roadbed,
The ground cover block 4 is installed on the floor slab 2 so that the anchor bolts 30, 30 ... Are located inside the insertion holes 31, 31.
Further, the poles 25, 25 ... Are erected on the insertion holes 32, 32. Next, the insertion holes 31, 31, ... And the insertion holes 32,
32 ... Concrete is placed in the concrete part 3
The floor slab 2 and the ground covering block 4 and the ground covering block 4 and the poles 25, 25 ... Are joined to each other by forming 3, 33.

In the above-mentioned end structure of the roadbed, the projecting wall parts 20, 20 ... Which project to the outer end part 18 of the ground covering block 4.
The poles 25, 25 ...
A strip-shaped plate member 26 (guard rail) is installed between 5 ... In this case, the weight of the poles 25, 25 ... And the strip-shaped plate member 26 is mainly applied to the projecting wall portions 20, 20 .. However, since these weights are sufficiently lighter than the ground cover block 4, There is no problem in terms of strength. Further, in the ground covering block 4, the weight of the space portion between the protruding wall portions 20 and 20 is reduced as compared with the conventional one, and in the floor slab 2 the weight of the space portion between the protruding wall portions 21 and 21 is reduced as compared with the conventional one. It As a result, the weight of the roadbed ends can be reduced during the widening work of bridges, etc., and it is possible to avoid the installation of new bridge girders. In addition, lightweight members can be used in construction work such as bridges, the dead load of the structure can be reduced, and the structure can be easily transported.

[0013]

As described above, according to the end structure of the roadbed of the present invention, a plurality of outwardly projecting width direction projecting portions are provided at the outer ends of the ground block at predetermined intervals in the length direction of the roadbed. Since the protruding wall portion is formed, it is possible to provide a lightweight roadbed end portion. This makes it possible to avoid the installation of new bridge girders in widening construction of bridges. In addition, since lightweight members can be used in construction work such as bridges, the dead load of the structure can be reduced and the structure can be easily transported.

[Brief description of drawings]

FIG. 1 is a perspective view of an end structure of a roadbed shown as an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a joint structure of the precast floor slab, the ground block and the pole shown in FIG.

FIG. 3 is a perspective view showing a main part of a conventional bridge structure.

FIG. 4 is a cross-sectional view of a main part of a bridge showing a method for widening construction of a bridge or the like.

[Explanation of symbols]

 2 Precast floor slab 4 Ground cover block 6 Protective member 18 Ground cover block outer end 20 Projected wall 25 Pole 26 Strip plate

Claims (2)

[Claims] 1. A ground cover block is installed on an upper surface of a width direction end portion of a precast floor slab constituting a roadbed so as to extend in a length direction of the roadbed, and an outer end portion of the ground cover block in the width direction. , In the end structure of the roadbed that is provided above the outer end and in which the protective member extending in the lengthwise direction is installed, at the outer end of the ground covering block, a predetermined interval is provided in the lengthwise direction. In the end structure of the roadbed, a plurality of projecting wall portions projecting outward in the width direction are formed, and the protective member is installed on these projecting wall portions. 2. The roadbed end structure according to claim 1, wherein the protection member includes a plurality of poles erected on the protruding wall portion and a strip-shaped plate body provided between the poles. End structure of the roadbed characterized by.