JPH0228653B2 - HAGANE * KONKURIITOSANDOITSUCHIPANERUNOHOKYOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reinforcing steel/concrete sandwich panels constituting side walls of ice pressure-resistant walls such as artificial islands in ice.

Figures 1 and 2 are outline drawings of an artificial island 1 that is installed in an icy area and is engaged in oil drilling and production, etc. It is possible that the island will be made of concrete, steel, or a hybrid type that combines concrete and steel. and
It is expected that many will be put into operation in the future.

In such an artificial island 1, the side wall that receives ice pressure is the outer wall portion shown by 2 in FIGS. 1 and 2, and if it is made of steel, it often has a structure as shown in FIG. 3.

That is, in Fig. 3, 3 is the outer plate, 4 is small aggregate such as shaped steel, and 5 is supporting aggregate such as large shaped steel or welded assembled steel. is transmitted through the small aggregates 4 to the inside of the artificial island 1 on the supporting aggregate 5 side.

However, the artificial island 1 made of steel has the drawback of high cost and a tendency for the total weight to be too light, and it is also being considered to use concrete in a part to increase stability in icy waters.

Next, Fig. 4 shows a conventional example in which the outer wall 2 of the side wall, which is an ice pressure-resistant wall, is made of a sandwich panel of steel and concrete, and the outer wall 2, inner wall 6, and internal finishing material 7 are made of steel. A box-shaped cell is formed, and this space is filled with concrete 8.

However, if the state shown in Figure 4 remains, the steel and concrete 8 may separate, and the concrete 8 itself is powerless against tensile loads, so the strength of the sandwich panel made of steel and concrete 8 is extremely low. .

Therefore, as shown in FIGS. 6 and 7, a large number of dowels 9 are arranged inside the steel plate outer wall 2 and inner wall 6 to improve the adhesion between the steel plate and the concrete 8, or as shown in FIG. 10, and it is necessary to apply a tensile load to the concrete 8.

However, since the ice pressure resistance wall shown in Fig. 4 is usually about 300 mm thick, the arrangement of the reinforcing bars 10 shown in Fig. 5 is an extremely difficult task, and the dowels 9 shown in Figs. There is no way to connect the dowel 9 to the inner wall 6, and as shown in the figure, the head of the dowel 9 ends up stopping at a halfway point, and when repeated loads are applied to the concrete 8, cracks occur in the concrete 8 from near the head of the dowel 9. There is a fear.

In addition, since the distance between the outer wall 2 and the inner wall 6 is about 300 mm, people cannot enter the 8th wall.
As shown in the figure, the only method available is to combine an outer wall 2 and an inner wall 6 made of two steel plates with a dowel 9 attached to the front.

Therefore, the present invention eliminates reinforcing bars and dowels with half-finished ends in the steel and concrete sandwich panel described above, and uses studs that connect both the outer wall and the inner wall, thereby combining concrete and steel. To provide a method for reinforcing a concrete sandwich panel, which improves the connection between the panels and makes them behave as if they were an integral structural member, thereby allowing the load applied to the panel to be rationally shared between the outer wall and the inner wall. The purpose is to

That is, the method for reinforcing a steel/concrete sandwich panel of the present invention involves, in a concrete panel whose inner and outer walls are covered with steel plates, the tips of a large number of studs attached to the inside of the outer wall are attached to each of the studs on the inner wall. After penetrating the holes provided at corresponding positions, plugging the holes, fixing the tip of each stud to the inner wall, and filling the space formed by the inner wall and outer wall with concrete. It is characterized by:

Examples of steel/concrete sandwich panels to which the reinforcing method of the present invention is applied will be described below with reference to the drawings. Fig. 9 is a side sectional view of Example 1 of the steel/concrete sandwich panels of the present invention. , FIG. 10 is a sectional view taken along the line BB in FIG. 9, and FIG. 11 is an enlarged sectional view of the main part of FIG. 19.

First, the surface of the outer wall 2 in Fig. 9 is the surface that the ice comes into contact with, and is flat with no unevenness, and in its side cross section, the outer wall 2, inner wall 6, and internal partition material 7 form a box-shaped grid. The outer wall 2, inner wall 6, and internal partition material 7 are made of steel.

A large number of studs 11 are attached to the outer wall 2, and the studs 11 are made of steel bars.

This stud 11, as shown in FIG.
It is sufficiently longer than the distance between the outer wall 2 and the inner wall 6, and the tip thereof passes through a hole 12 made in the inner wall 6 and protrudes.

The gap between this hole 12 and the stud 11 is closed with a closing plate 13, and the gap between the stud 11 is closed.
1 and the inner wall 6 firmly.

The space formed by the outer wall 2 and inner wall 6 is filled with concrete 8 using a separately provided pipe or the like after the closing plate 13 work is completed.

In addition to the method of attaching the closing plate 13 by welding to close the gap between the stud 11 and the hole 12, as shown in Embodiment 2 of FIG.
There is also a method in which the stud 11 is formed into a bolt with a threaded tip and is fixed with a nut 15 via a washer 14 as a cover plate 13.

Of course, it is also conceivable to use a deformed steel bar for the stud 11 shown in FIG. 9, and in this case there is an advantage that the surface contact between the steel and the concrete 8 is even better.

That is, the reinforcing method for steel/concrete sandwich panels of the present invention involves attaching an appropriate number of studs to the outer wall, making the length of the studs long enough to cover the width between the outer wall and the inner wall, and attaching studs to the inner wall. Drill a hole so that the tip of the stud protruding from the outside wall can pop out of the hole, then cover the hole in the inner wall and the tip of the stud sticking out from this inner wall with a closing plate, and secure the stud to the inner wall. It is characterized by filling the space with concrete using a separately installed pipe after the above work is completed.

As a result, by applying the present invention, there is an advantage that the extremely labor-intensive work of arranging reinforcing bars, which was conventionally required, can be eliminated.

In addition, with the conventional dowel system in which the end is located in the middle of the concrete member, there is a risk of cracks occurring in the concrete part as the load is repeatedly applied due to ice pressure. The studs that connect the outer and inner walls reduce the possibility of cracks forming, and the large number of studs that connect the outer and inner walls improves the adhesion between the concrete and steel, making the outer wall, inner wall, and inner concrete appear as if they were one piece. It acts as a strong force.

Furthermore, this results in the advantage that the number of studs can be reduced compared to the number of conventional dowels with an intermediate termination.

[Brief explanation of drawings]

Figures 1 and 2 are external views of an artificial island for ice seas, Figures 3 and 4 are side sectional views showing the structure of conventional ice pressure walls made of steel and steel/concrete, respectively;
Figures 5 and 6 are side sectional views of other conventional steel/concrete sandwich panels, Figure 7 is a plane sectional view taken along the A-A direction in Figure 6, and Figure 8 is a side sectional view of another conventional steel/concrete sandwich panel. FIG. 9 is a side sectional view of a conventional sandwich panel with a dowel attached, FIG. 9 is a side sectional view of Example 1 of the steel/concrete sandwich panel of the present invention, and FIG. 10 is a side sectional view taken along the line B-B in FIG. 11 is an enlarged sectional view of the main part of FIG. 9, and FIG. 12 is an enlarged side sectional view of the main part of the steel/concrete sandwich panel in Example 2 of the present invention. 2...Outer wall, 6...Inner wall, 8...Concrete, 11
... Stud, 12... Bakahole, 13... Blocking board, 1
5...Natsuto.

Claims (1)

[Claims] 1. In a concrete panel whose inner and outer walls are covered with steel plates, the tips of a number of studs attached to the inside of the outer wall are passed through holes provided in the inner wall at positions corresponding to the studs mentioned above, and then A method for reinforcing a steel/concrete sandwich panel, which comprises closing the holes, fixing the ends of each stud to the inner wall, and filling the space formed by the inner and outer walls with concrete.