JP3406383B2 - Subgrade ground covering construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a ground cover provided on a side of a roadbed such as a bridge. 2. Description of the Related Art Generally, a wall rising from a roadbed is provided at an end of a roadbed of a bridge structure in a width direction in order to prevent a vehicle running on the roadbed from deviating from a road surface. I have. FIG. 4 is a diagram illustrating 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 slab constituting a roadbed installed on the bridge girder, and 3 is a wall body provided on an upper surface of a width direction end of the precast slab. The wall 3 includes a concrete plate 4 having a predetermined thickness,
5 is comprised. The concrete plate 4 is called a ground cover, and the concrete plate 5 is called a wall railing. Conventionally, as for the method of joining the ground cover 4 to the floor slab 2, as shown in FIG. 5, female screw holes 6a, 6a are formed in the floor slab 2.
Are embedded, and a plurality of bolt insertion holes 7, 7,... Are formed in the ground cover 4 at positions corresponding to the female screw holes 6a, 6a,. Are positioned on the floor slab 2 so that the bolt insertion holes 7, 7... Are guided into the bolt holes 8, the bolts 8 are inserted into the respective bolt insertion holes 7, and the female screw holes are inserted by a fastening machine or the like. 6
The ground cover 4 was joined to the floor slab 2 by screwing the bolts 8 to a. [0004] In the ground cover 4 shown in FIG. 5, when the ground cover 4 is installed on the floor slab 2, the ground cover 4 is placed on the floor slab 2. However, the female screw hole 6a cannot be visually observed during the work, and it is difficult to accurately position the ground cover 4, and the workability is poor, resulting in a decrease in work efficiency. If the female screw hole 6a or the bolt insertion hole 7 is not formed at an accurate position, the bolt 8 is not connected to the female screw hole 6a.
And the ground cover 4 cannot be joined to the floor slab 2 in some cases. In order for the ground cover 4 to be joined to the floor slab 2,
A large number of bolts 8, 8,... Are required, and a large amount of labor is required for fastening these bolts, and since the ground cover 4 is a solid concrete block, the weight is heavy and the transportation cost is high. There was a problem. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and eliminates the work required for accurate positioning of a ground cover and a floor slab and fastening bolts, thereby joining the ground cover to a floor slab. An object of the present invention is to provide a ground covering method in which the work efficiency of the work is improved and the material can be easily transported. According to the present invention, there is provided a precast floor slab in which a first reinforcing bar is provided at an end portion in a width direction in advance, and is separated from a precast floor slab with a predetermined width. First and second concrete blocks extending in parallel with each other and connected to each other by a second reinforcing bar are manufactured, and the precast slab is attached to the first reinforcing bar by a width direction end of a roadbed. , And the first and second concrete blocks are placed on the upper surface of the end portion of the precast floor slab with the first reinforcing bar located therein, and the first and second concrete blocks are further installed. A third reinforcing bar is disposed between the second concrete blocks so as to extend in a length direction of the roadbed, and thereafter is defined by an end of the precast slab and the first and second concrete blocks. Space The concrete is cast in a form in which the first, second, and third reinforcing bars are embedded. According to the method for constructing the ground covering of the roadbed of the present invention, since the first and second concrete blocks are only placed on the precast floor slab, the positions of the screw holes and the insertion holes are determined. It can be constructed without including a strict alignment work such as alignment. First, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of a ground covering applied according to the present invention. In FIG. 1, reference numeral 11 denotes a precast floor slab (hereinafter referred to as a floor slab) constituting a roadbed, and reference numeral 12 denotes a ground covering. A ground covering 12 is provided on a top surface of an end portion in the width direction of the floor slab 11 with a first concrete block 13 and a second concrete block provided so as to extend in the length direction of the roadbed at intervals in the width direction. Block 14 and second reinforcing bars 15, 15 inserted between the concrete blocks 13, 14
... and a concrete block 13 at the end of the floor slab 11
Are provided between the concrete blocks 13 and 14 so as to extend in the longitudinal direction of the roadbed.
, Reinforcing bars 15, 15 ..., reinforcing bars 16, 16 ..., reinforcing bars 17, 17 ... in the space defined by the ends of the floor slab 11 and the concrete blocks 13, 14.
And a concrete part 18 cast in a state of being buried. The reinforcing bar 15 is a reinforcing bar having bar portions 15a, 15a and a folded portion 15b.
Is buried in the concrete block 13, and the folded portion 15 b is buried in the concrete block 14. The reinforcing bar 16 is a U-shaped reinforcing bar, and both ends of the reinforcing bar 16 are buried in the width direction end of the floor slab 11. The reinforcing bars 15, 15... And the reinforcing bars 16, 16,... Are provided at the same width in the longitudinal direction of the roadbed at the widthwise ends of the floor slab 11. At the end of the floor slab 11 in the width direction,
A plurality of height adjusting bolts 19 are buried at regular intervals in the length of the roadbed, and the height adjusting bolts 19, 19 ...
A concrete block 13 is installed on the top. A sealing material 20 such as an iron plate or a rubber plate is installed on the floor slab 11 so as to extend in the length direction of the roadbed, and a concrete block 14 is installed on the sealing material 20. Outside surface 22 of concrete block 13 and floor slab 11
The contact plate 21 is disposed between the contact plate 21 and the outer surface 23 so as to cover the gap 25 formed therebetween.
Are fixed by bolts screwed into screw holes (not shown) formed in the outer surface 22 and the outer surface 23. FIG. 2 is a view showing a support structure of the concrete block 13. As shown in FIG. As shown in this figure, screw cylinders 27, 27 having female screw holes 28, 28 ... are embedded at equal intervals in the length of the roadbed at the width direction end of the floor slab 11. The height adjusting bolt 19 has a male screw portion 29 formed at one end of a shaft portion 19a and a hexagonal head portion 30 formed at the other end. A part 31 is formed. Hereinafter, the above ground covering method will be described. First, a reinforcing bar 1 that protrudes upward at an end in the width direction in advance.
Floor slab 1 in which 6, 16 ... and screw cylinders 27, 27 ... are embedded.
1 and concrete blocks 13 and 14 which are spaced apart from each other with a predetermined width and extend in parallel with each other, and are connected to each other by reinforcing bars 15, 15. Next, these are brought into the site, and the floor slab 11 is
After being installed on the bridge girder so that 6, 16,... Are located at the widthwise ends of the roadbed, screw cylinders 27 embedded in the floor slab 11,
The male screw portion 29 of the height adjusting bolt 19 is screwed into the female screw hole 28 of 27.
The sealing material 20 is placed at a predetermined width at 9, 19. Next, the reinforcing bars 16, 16...
The concrete block 13 is set on the height adjusting bolts 19, 19,..., And the concrete block 14 is set on the sealing material 20 so as to be located inside the seal members 3, 14.
Next, rebars 17, 17,... Are arranged between the concrete blocks 13, 14 so as to extend in the length direction of the roadbed, and the rebars 17 are fastened to the rebars 15, 16 by wires or the like. Next, the level of the concrete block 13 is adjusted by adjusting the heights of the height adjusting bolts 19. In this case, even if there are irregularities on the floor plate 11, if the heights of the respective height adjusting bolts 19 are appropriately adjusted, the concrete blocks 13 installed on them can be adjusted.
Can be kept horizontal. Therefore, the outer surface 22 of the concrete block 13 and the outer surface 2 of the floor slab 11
3, the backing plate 21 is fixed. Next, concrete is poured into the space defined by the end of the floor slab 11 and the concrete blocks 13 and 14 to form the concrete portion 18, thereby completing the construction of the ground covering 12. In the method of applying the ground covering 12, the concrete block 13 is provided with the height adjusting bolts 19, 19,.
The concrete block 14 is set on the sealing material 2
Positioning is performed so as to be set on zero. This work does not include an element that is difficult to see such as positioning the bolt insertion hole 7 on the female screw hole 6a in the conventional example, and does not require positioning accuracy as high as the conventional example.
Work efficiency of construction work is greatly improved. When the ground cover 12 is constructed, two concrete blocks 13 and 14 are preliminarily manufactured.
And an assembly consisting of reinforcing bars 15, 15..., But this assembly does not include the concrete portion 18, so that it is lightweight and can be easily transported. When the concrete portion 18 is formed, the end of the floor plate 11, the concrete blocks 13 and 14, the sealing material 20, and the backing plate 2
Since there is only a need to cast concrete between them, there is an advantage that no formwork is required. Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing another example of a ground covering constructed according to the present invention. 3, the same components as those in FIG. 1 described above are denoted by the same reference numerals, and description thereof will be omitted. The second embodiment differs from the first embodiment in the following points. The concrete block 13 is formed with a notch 35 at a lower inner corner thereof, and a sealing member 33 is provided on the width direction end of the floor slab 11 in place of the height adjusting bolts 19, 19. Are installed so as to extend in the length direction of the roadbed. The concrete block 13 is a floor slab 11
Is disposed on the seal member 33 so that the end of the seal member 33 and the seal member 33 are located inside the cutout portion 35. At this time,
A gap 36 is formed between the opposing surfaces of the concrete block 13 and the floor slab 11. The method of applying the ground cover 12 of this embodiment is basically the same as that of the first embodiment, and the differences between the second embodiment and the second embodiment will be described below. After installing the floor slab 11 on the bridge girder, instead of installing the height adjusting bolts 19, 19, the sealing material 33 is placed on the width direction end of the floor slab 11.
It is arranged to extend in the length direction of the roadbed. Next, the concrete block 1 is placed on the sealing material 33 so that the end of the floor slab 11 and the sealing material 33 are positioned inside the notch 35.
3 is installed. Further, in this embodiment, there is no work for fixing the backing plate 21, and finally concrete is poured into the space defined by the end of the floor slab 11, the concrete blocks 13, 14 and the sealing materials 20, 33. Then, the construction of the ground cover 12 is completed by forming the concrete portion 18. In this embodiment, the same effects as in the first embodiment can be obtained. Further, in this embodiment, since the gap 36 is formed between the concrete block 13 and the floor plate 11, it is possible to prevent rainwater from flowing from the concrete block 13 side to the lower surface of the floor plate 11 during rainfall or the like. it can. Further, in this embodiment, since the outer side surface 23 of the floor slab 11 is covered with the notch 35, it is possible to effectively prevent rainwater from entering the ground cover 12 side. Further, since there is no backing plate 21, the side surface of the roadbed can be beautiful. As described above, according to the method of the present invention, the first and second concrete blocks are installed above the precast floor plate, and the precast floor plate and the first and second concrete blocks are provided. Since concrete is poured into the space defined by the blocks, it is not necessary to perform work that is difficult to see as in the past, and construction can be performed without requiring positioning accuracy. Efficiency is greatly improved. In addition, at the time of construction, two concrete blocks and a plurality of rebars connecting them are assembled in advance, and the assembled material and other materials are transported to the construction site, so that each material is lightweight. Therefore, the material can be easily transported.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a ground covering applied according to the present invention. FIG. 2 is a sectional view showing a concrete block support structure used in the embodiment of FIG. FIG. 3 is a perspective view showing another example of a ground covering applied according to the present invention. FIG. 4 is a perspective view showing a floor slab and a ground covering in the bridge structure. FIG. 5 is a cross-sectional view showing a conventional joint structure of a ground covering to a floor slab. [Description of Signs] 11 Precast slab 12 Ground covering 13 First concrete block 14 Second concrete block 15 Second reinforcing bar 16 First reinforcing bar 17 Third reinforcing bar 18 Concrete part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E01D 19/10-19/12 E01C 11/22 E01F 15/02

Claims (1)

(57) [Claims 1] A precast floor slab in which a first reinforcing bar projecting upward at a width direction end is arranged in advance with a predetermined width and parallel to each other. The first and second concrete blocks are manufactured in such a manner that the first and second concrete blocks are connected to each other by a second reinforcing bar, and the precast slab is positioned at the widthwise end of the roadbed. The first and second concrete blocks are placed on the upper surface of the end portion of the precast floor slab with the first reinforcing bar located therein, and the first and second concrete blocks are further installed. A third reinforcing bar is arranged between the concrete blocks of the first and second blocks so as to extend in the longitudinal direction of the roadbed.
A ground covering method for a roadbed, wherein concrete is poured in a form in which the first, second, and third reinforcing bars are embedded in a space defined by a second concrete block.