JP2948554B2 - Steel and concrete sandwich composite precast slab joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a joint structure of a sandwich composite precast slab of a steel sheet and concrete formed by casting concrete between an upper steel sheet and a lower steel sheet.

As shown in FIG. 14, a general joint structure of a sandwich composite precast slab of a steel plate and a concrete is such that an upper steel plate 2 and a lower steel plate 4 of an adjacent precast slab 1 are opposed to each other. Each of them protrudes from the concrete 3 to form a splice plate joint 2c, 2c and a splice plate joint 4c, and the splice plate joints 2c, 2c
c, the upper contact steel plate 5,
The lower attached steel plate 6 is bridged and arranged, bolted using bolts and nuts, and the upper steel plate 2 and the lower steel plate 4 are connected.

[0003]

However, this structure has several problems.

[0004] With this structure, the upper contact steel plate 5 is attached to each of the adjoining plate joint portions 2c-2c and 4c-4c of the upper steel plate 2.2 and the lower steel plate 4.4 adjacent to the precast slab 1.1. ,
When the lower attachment steel plate 6 is arranged and bolted, the upper steel plate 2
-A nut must be spot-welded to the inner surface of one or both of the lower steel plate 2 and the lower steel plate 3 and tightened using the head of the HT bolt, and it is difficult to precisely control the tightening.

In addition, since the head of the HT bolt is directed downward, the appearance is not good and the painting is troublesome. Further, the spliced plate joints 2c, 2c of the upper steel plate 2, 2, which are continuous with the upper steel plate 5, and the lower steel plate 4, which is continuous with the lower steel plate 6,
The rigidity is insufficient between the adjoining plate joints 4c and the adjacent concrete 3 and the gap between the adjacent concretes 3 is about 15 to 20 centimeters. Traffic cannot be opened.

[0006] The present invention is to solve such a problem.

[0007]

Means for solving the problem will be described below.

First, in a sandwich composite precast slab of a steel sheet and concrete formed by casting concrete between an upper steel sheet and a lower steel sheet, opposing end faces of the concrete and concrete at the ends of the adjacent slab and the lower steel sheet. And the opposite end faces of the lower steel plate are formed so as to have a comb-tooth shape in which the convex portions and the concave portions face each other, and a lower attachment bolt tightening hole penetrating from the upper steel plate upper surface to the concrete lower surface inside both convex portions. A perforated upper steel plate having a perforated lower mounting bolt tightening hole penetrating the lower mounting bolt tightening hole is disposed over the upper steel plate of the adjacent floor slab and the upper steel plate. The steel plate and the upper steel plate are bolted together at the positions of the comb-shaped recesses, and the lower steel plate and the lower steel plate are arranged with the lower steel plate extended over the lower surface of the lower steel plate. Contact Providing joint structure of a sandwich synthetic precast floor slab of steel and concrete, characterized in that formed by bolting at the position of the belt fastening holes.

Further, in the above means, the upper steel plate is partially cut off at an end of the upper steel plate, and a filler steel plate for correcting a level difference is arranged on the lower surface of the upper steel plate to the concrete end, and the upper attachment plate is placed thereon. And a sandwich composite precast slab of a steel plate and a concrete in which the step on the upper side of the upper steel plate and the upper attachment plate is eliminated.

[0010]

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

For convenience, an embodiment of the invention according to claim 2 will be described first.

First, an embodiment of adjacent precast floor slabs 1 will be described with reference to FIGS. FIG.
2 is a plan view, FIG. 2 is a cross-sectional view taken along line CC of FIG. 4, FIG. 3 is a plan view of the lower steel plate, FIG. 4 is a cross-sectional view taken along line AA of FIG.
It is BB sectional drawing of FIG.

The adjacent precast slabs 1 and the precast slabs 1 are both formed by casting concrete 3 between an upper steel plate 2 and a lower steel plate 4.

The upper steel plate 2 includes an upper steel plate 2b in which an end of the upper steel plate opposite to the adjacent floor slab is partially cut off, and an upper steel plate 2b.
b, which is formed by a step-correcting filler steel plate 2a which is arranged on the lower side of the concrete to the edge of the concrete and is fastened using bolts 9, washers 9a, nuts 10 and washers 10a, and at the same time is fixed to the concrete by penetrating bolts. Have been. Each of the facing end faces is formed in a straight line. Reference numeral 7b denotes a bolt hole for bolting an upper contact steel plate described later, and reference numeral 13b denotes a lower contact bolt tightening hole also formed together with the upper contact steel plate and concrete.

The opposing end faces of the adjacent precast slab 1 and the concrete 3 and the concrete 3 of the precast slab 1 and the lower steel plate 4 and the lower steel plate 4 have the convex portions 1 in the concrete 3.
The lower steel plate 4 is formed in a comb-teeth shape with the convex portion 12a and the concave portion 12b facing each other. Like the upper steel plate 2, the lower steel plate 4 is fixed to concrete by a through bolt using a bolt 9, a washer 10a, and a nut 10. Here, as a fixing method to concrete, it is a matter of course that the upper steel plate and the lower steel plate may be performed by individual bolts or the like.

Reference numerals 13b and 13c denote attachment bolt tightening holes penetrating from the upper surface of the upper steel plate attachment plate to the concrete lower surface, which will be described later. The concrete 3 is perforated at a position corresponding to the inside of the convex portion. Reference numeral 14a is a bolt hole for fastening a lower attachment steel plate described later with a bolt.

FIG. 6 is a plan view of the upper attached steel plate 5.

The upper contact steel plate 5 is formed to have a width which is stretched over the step steel plate 2a and the filler steel plate 2a facing each other and arranged between the upper steel plate 2b and the upper steel plate 2b. Reference numeral 13a denotes a lower attachment bolt tightening hole communicating with the lower attachment bolt tightening holes 13b and 13c formed in the step correction filler steel plate 2a and the concrete 3, 7
a is a bolt hole communicating with the bolt hole 7b of the filler steel plate 2a for correcting a level difference of the upper steel plate 2.

FIG. 7 is a plan view of the lower attached steel plate 6.

The lower attached steel plate 6 is formed to have a width which is arranged so as to be bridged from the lower surface of the lower steel plate 3 facing the lower steel plate 3. 14b is a bolt hole communicating with the bolt hole 14a of the lower steel plate 4.

Next, an embodiment of a specific joint structure will be described with reference to FIGS. 8 is a plan view, FIG. 9 is a sectional view taken along the line aa in FIG. 8, and FIG. 10 is a sectional view taken along the line bb in FIG.

First, the adjacent precast slab 1 and the filler steel plate 2a for correcting the level difference between the precast slabs 1 and the filler steel plate 2a for correcting the level difference are provided with holes 13a for tightening the upper auxiliary steel plate 5 and the lower auxiliary mounting bolts. Bolt 1 for penetrating the lower attachment bolt penetrating the filler steel plate 2a for concrete and the concrete 3
3b and 13c, and the bolt holes 7a are arranged so as to bridge with the bolt holes 7b drilled in the filler steel plate 2a for correcting the level difference.
7b, insert the bolt 15 into the recess 1 from the lower surface of the lower steel plate 4.
The nut 16 is fastened to the bolt 15 by using 2b and 11b, and the filler steel plates 2a, 2a for correcting the step and the upper attached steel plate 5 are fastened. 15a and 16a are washers.

Next, the adjacent precast slab 1 and the lower steel plate 4 of the precast slab 1 and the lower steel plate 4, and the lower attachment steel plate 6 with the bolt holes 14 b aligned with the bolt holes 14 a of the lower steel plate 4. The bolt 17 is inserted into the bolt holes 14b and 14a from the lower surface, and the nut 18 is tightened to the bolt 17 from above using the lower attachment bolt tightening holes 13a, 13b and 13c. 4 and the lower attached steel plate 6 are fastened. 17a and 18a are washers.

Thus, a joint structure between adjacent precast slabs is formed.

Next, an embodiment of the invention according to claim 1 will be described below.

FIG. 11 is a plan view, and FIG.
FIG. 13 is a sectional view taken along line c-c of FIG. 11.

Adjacent precast floor slabs 1 consist of upper steel plate 2
Concrete 3 is cast between the lower steel plate 4 and the lower steel plate 4. In the above embodiment, the upper steel plate 2 is partially cut off at an end of the upper steel plate, and a filler steel plate for correcting a level difference is placed on the lower surface of the upper steel plate to the concrete end, and an upper attachment plate is placed thereon. In contrast to the configuration in which the step between the upper side of the upper steel plate and the upper side of the upper contact plate is eliminated, in this embodiment, the upper plate is formed as one sheet. The lower attachment bolt tightening hole and the bolt hole for fastening the upper attachment steel plate are drilled at the same positions as the holes drilled in the step-correcting filler steel plate described in the above embodiment. Concrete 3 and lower steel plate 4 are the same as those shown in the above embodiment. The same structure can be used for the upper steel plate 5 and the lower steel plate 6.

First, the adjacent precast slab 1, the upper steel plate 2 of the precast slab 1, and the upper attached steel plate 5 on the upper steel plate 2
The lower mounting bolt tightening holes 13a and the lower mounting bolt tightening holes 13b and 1
3c and the bolt holes 7a are arranged so as to span the steel plate 2 so that the bolt holes 7a coincide with the upper steel plate 2.
7b, insert the bolt 15 into the lower
The nut 16 is fastened to the bolt by using b and 11b, and the upper steel plate 2 and the upper attached steel plate 5 are fastened. 15a, 16a
Is a washer.

Next, the adjacent precast slab 1 and the lower steel plate 4 and the lower steel plate 4 of the precast slab 1 are inserted into the lower steel plate 6 so that the bolt holes 14b match the bolt holes 14a of the lower steel plate 4. The bolt 17 is inserted through the bolt holes 14b and 14a from the lower surface, and the nut 18 is fastened to the bolt 17 from above using the lower attachment bolt tightening holes 13a, 13b and 13c. 4 and the lower attached steel plate 6 are fastened. 17a and 18a are washers.

Thus, a joint structure with the adjacent precast slab is formed.

In both of the above-mentioned embodiments, in any case, there is little space between the adjacent precast slabs, so that it is not necessary to cast concrete. It is sufficient to fill a quick-setting material into the lower attachment bolt tightening hole to fill the gap.

[0032]

Since the present invention has been made as described above,
It has the following effects.

[0033] In the first and second aspects, the opposing end faces of the concrete and the concrete and the opposing end faces of the lower steel plate and the lower steel plate at the end portions of the adjacent floor slabs are comb-toothed with the convex portions and the concave portions facing each other. Therefore, the upper contact steel plate can be bolted to the upper steel plate by using the concave portion. For this reason, there are few opposing concrete gaps, and it is possible to open the traffic without putting concrete on site.

Further, since a lower attachment bolt tightening hole penetrating from the upper surface of the upper steel plate to the lower surface of the concrete is drilled, a nut is spot-welded to one or both of the upper steel plate and the lower steel plate. In order to be able to bolt the lower steel plate attachment plate using this hole even after the upper steel plate attachment plate was bolted to the upper steel plate, it was only possible to tighten using the bolt head. became. Therefore, the accuracy of the tightening management can be improved.

As the fastening bolt, a torque bolt or a driving bolt can be used instead of the HT bolt.

According to the second aspect of the present invention, the end of the upper steel plate is partially cut out, and the filler steel plate for correcting the step is placed on the lower surface of the upper steel plate to reach the concrete end. The resulting step on the joint surface can be eliminated.

[Brief description of the drawings]

FIG. 1 is a plan view of adjacent precast floor slabs.

FIG. 2 is a sectional view taken along line CC of FIG.

FIG. 3 is a plan view of adjacent lower steel plates.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is a sectional view taken along line BB of FIG. 1;

FIG. 6 is a plan view of the upper attached steel plate.

FIG. 7 is a plan view of a lower attached steel plate.

FIG. 8 is a plan view of the joint structure.

FIG. 9 is a sectional view taken along line aa of FIG. 8;

FIG. 10 is a sectional view taken along line bb of FIG. 8;

FIG. 11 is a plan view of another joint structure.

FIG. 12 is a sectional view taken along the line cc of FIG. 11;

FIG. 13 is a sectional view taken along line dd of FIG. 11;

FIG. 14 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast slab 2 Upper steel plate 2a Filler steel plate for level difference correction 2b Upper steel plate 2c Splicing plate joint 3 Concrete 4 Lower steel plate 4c Splicing plate joint 5 Upper spliced steel plate 6 Lower spliced steel plate 7a Bolt hole 7b Bolt Hole 9 Bolt 9a Washer 10 Nut 10a Washer 11a Convex portion 11b Concave portion 12a Convex portion 12b Concave portion 13a Underpass attachment bolt tightening hole 13b Underpass attachment bolt tightening hole 13c Underpass attachment bolt tightening hole 14a Bolt hole 14b Bolt hole 15 Bolt 15a Washer 16 Nut 16a Washer 17 Bolt 17a Washer 18 Nut 18a Washer

Claims (2)

(57) [Claims] 1. A sandwich composite precast slab of a steel sheet and concrete formed by casting concrete between an upper steel sheet and a lower steel sheet, and opposing end faces of concrete and concrete at adjacent ends of the floor slab and a lower steel sheet. And the opposite end faces of the lower steel plate are formed so as to have a comb-like shape with the convex and concave portions facing each other, and a lower attachment bolt tightening hole penetrating from the upper steel plate upper surface to the concrete lower surface inside both convex portions. A perforated upper steel plate having a perforated lower mounting bolt tightening hole penetrating the lower mounting bolt tightening hole is disposed over the upper steel plate of the adjacent floor slab and the upper steel plate. The steel plate and the upper steel plate are bolted together at the positions of the comb-shaped recesses, and the lower steel plate and the lower steel plate are arranged with the lower steel plate extended over the lower surface of the lower steel plate. Contact bolt A joint structure of a sandwich composite precast slab of a steel plate and a concrete characterized by being bolted at a position of a fastening hole. 2. The upper steel plate is formed by partially cutting out an end of the upper steel plate, placing a filler steel plate for correcting a level difference on the lower surface of the upper steel plate up to the concrete end, and arranging an upper attachment plate thereon.
The sandwich precast slab of a steel plate and concrete according to claim 1, wherein a step between the upper steel plate side and the upper contact plate is eliminated.