JPH05195576A - Steel plate Surface steel plate for concrete structures - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a surface steel plate for a steel plate concrete structure capable of easily specifying a mounting position of an attachment member in the surface steel plate for a steel plate concrete structure. [Structure] In a steel sheet concrete structure surface steel sheet 1 in which an attachment member embedded in filled concrete is attached to the inner surface of a surface steel sheet 1, a press mark 2 is provided on the inner and outer surfaces of the surface steel sheet corresponding to the attachment portion of the attachment member. A surface steel plate for steel plate concrete structure 1, which is characterized by being provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface steel plate for a steel plate concrete structure, characterized in that a predetermined number of inner and outer surfaces of the surface steel plate are provided with press marks.

[0002]

2. Description of the Related Art A steel plate concrete structure is one in which steel plates are arranged on the surface of a concrete skeleton, and based on the combined effect of concrete and steel plates, it has higher strength and durability than other structural modes such as reinforced concrete. Since both are excellent, they have been adopted in nuclear facilities and general large-scale civil engineering / building structures in recent years.

However, it is necessary to dismantle the steel plate concrete structure after a certain period of service,
During the dismantling work, the surface steel plate must be separated from the concrete. After the surface steel plate is once peeled from the concrete, it is possible to adopt a demolition method that is almost the same as that of unreinforced concrete, but in the case of a steel plate concrete structure, how can the surface steel plate be efficiently peeled from the concrete due to its strong structure. This is a major technical issue. That is, in a steel plate concrete structure, in general, in order to secure a strong joint between the filled concrete and the surface steel plate and a combined effect of both members, a stud bolt, a slip-preventing material such as a shaped steel is attached to the inner surface of the surface steel plate, In addition, connecting materials such as shavers that connect opposing surface steel plates are also attached to the surface steel plates in order to provide strength against the concrete-filling lateral pressure and maintain the original shape. It is necessary to separate these slip prevention materials, tie materials and the like from the surface steel sheet before peeling from the steel sheet (see FIG. 4). However, in the conventional surface steel sheet, it is difficult to know the exact mounting position of the steel sheet inner surface such as the anti-slip material and the tie material from the surface steel sheet outer surface. It takes a considerable amount of time to identify the mounting location of the above, that is, to identify the mounting location of each of the above members from the outside of the surface steel plate, which is a problem from the viewpoint of work efficiency. There was also a problem that radiation exposure was unavoidable.

[0004]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to provide a steel plate concrete structure capable of easily specifying the mounting position of the attachment member on the surface steel plate for steel plate concrete structure without depending on the design drawing. It is to provide a surface steel sheet for goods.

[0005]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems is to provide a surface steel plate for a steel plate concrete structure in which an attachment member embedded in filled concrete is attached to the inner surface of the surface steel plate, The press mark is formed on the inner and outer surfaces of the surface steel plate corresponding to the mounting portion of the attachment member to the surface steel plate.

The present invention will be specifically described below.

First, the steel sheet surface steel sheet for concrete structure which is the object of the present invention is a surface steel sheet used for the surface of a concrete skeleton, and the material thereof is not particularly limited. For example, various carbon steels, Si,
Ni, Mn, Cr, Cu, Al, W, Mo, V, Co,
There are special steels containing one or more kinds of Zr, Ti, Mo, Nb and the like, and as surface steel sheets for nuclear facilities, 302, 304, 304L, 305, 308, 309 are steel types.
309S, 310S, 316L, 321, 347, CM
There are various types such as -7M.

The shape of the surface steel sheet for steel plate concrete structure may vary depending on the structure in which it is used, the place of installation, etc., and is not necessarily limited to a flat plate shape, and for example, a corrugated shape or the like may be used. sell.

The attached member referred to in the present invention is attached to the inner surface of the surface steel plate in the surface steel plate for steel plate concrete structures such as stud bolts, slip prevention members such as shaped steel, tie members such as shaver, etc. It means a member to be embedded. The material, shape, and
The size, the number, the position on the inner surface of the steel sheet, and the like can change depending on the field of use of the target structure.

The press marks in the present invention correspond to the mounting portions of the above-mentioned attached member on the inner surface of the surface steel sheet and the mounting portions on the outer surface of the surface steel sheet, that is, the inner and outer surfaces. It is essential to provide so that the center points of the press marks of are aligned. And, at least the shape and depth of the press mark on the inner surface of the surface steel plate must be one that does not interfere with the attachment of the attachment member, and the surface steel plate can be effectively removed from the concrete by an appropriate tool during dismantling work. It must be peelable. Examples of the shape of the press mark include a circle, a polygon such as a quadrangle, and the like, but these shapes do not need to be particularly complicated, and it is preferable that a simple press die can be used. The press marks generally have the same shape on the inner and outer surfaces of the surface steel sheet, but may have different shapes on the inner and outer surfaces in some cases. Further, at least the shape of the press mark on the outer surface of the surface steel sheet can be changed according to the type of the attachment member, whereby the type of the attachment member attached to the inner surface of the surface steel sheet can be easily identified from the outside, It is possible to appropriately change the work contents, the dismantling tool, etc. depending on the place, and it is also possible to promote work efficiency.

The depth of the press mark in the present invention, that is, the unevenness dimension, is sufficient as long as it can be easily visually confirmed after the coating finish of the surface steel sheet, and therefore it is not necessary to make it deeper than necessary. Further, the intervals and positions of the press marks are set by the intervals and positions of the attachment members defined by the design. Therefore, when manufacturing the surface steel plate unit, it is necessary to allocate the steel plates in consideration of these intervals and positions. ..

A concrete example of the surface steel sheet for steel sheet concrete structures of the present invention is shown in FIG. In FIG. 1, 1 is a surface steel plate, 2 is a press mark, 3 is a stud bolt, 4
Is a stud weld.

As shown in FIG. 1, in the surface steel sheet for steel plate concrete structures of the present invention, attached members such as stud bolts 3 are attached to the inner surface of the surface steel sheet 1, and the attached members are filled with concrete (not shown). ) Is embedded in a steel plate concrete structure. In FIG. 1, a circular press mark larger than the outer diameter of the stud bolt is provided on the inner and outer surfaces of the surface steel sheet, a stud bolt is attached to the position of the press mark on the inner surface, and the periphery of the stud bolt is stud welded.

In the case where the stud bolt is attached to the surface steel plate shown in FIG. 1, the work procedure for separating the surface steel plate from the filled concrete will be described below.

FIG. 2 shows a case where the stud welded portion 4 is broken by the impact force of the impact hammer 5. As shown in the drawing, in this case, it is generally preferable to make the size of the press mark larger than the outer diameter of the impact portion (that is, the tip portion) of the impact hammer 5 so that the impact force reaches the welded portion sufficiently. The magnitude of the impact force required to break the welded portion is preferably grasped in advance according to the design items such as the material and thickness of the surface steel sheet, the material of the welding material and the welding method.

Next, FIG. 3 shows a case where the stud bolt mounting portion is drilled by the drill 6 (7 is a drilled portion) and the stud welded portion 4 is cut. As shown, it is generally preferred in this case to select the size of the drill 6 so that the entire weld is cut. In addition, when cutting the stud welding portion 4, other mechanical cutting methods such as a circular cutter, and thermal cutting methods using gas, arc, laser, etc. can be applied.

After the stud welded portion is broken or cut as described above, the surface steel plate can be easily peeled from the filled concrete after cutting into a suitable size as needed. And after the surface steel plate peeling, many existing stud bolts are only separated from each other and embedded in the filling concrete, and the entire concrete skeleton can be easily hammered or drilled as in the case of unreinforced concrete. It can be dismantled.

The surface steel sheet for steel plate concrete structures of the present invention is treated as described above when the structure is disassembled. The material and thickness of the surface steel sheet, the material and welding method of the related welding material, etc. With regard to the above, it is preferable to set in consideration of the strength and durability of the structure as well as the convenience in dismantling work according to the selected attachment members such as stud bolts, shaped steel, and shaver.

[0019]

According to the present invention described above, at the time of dismantling a steel plate concrete structure, it is possible to easily visually confirm from the outside of the surface steel plate the mounting location of an attachment member such as a slip prevention material or a connecting material. It is possible to efficiently perform the work of separating the surface steel sheet and the attached member. Therefore, especially in the case of nuclear power generation facilities, it is possible to significantly reduce the exposure dose to workers. This means that in Japan, where the sites that can be directed to nuclear power generation facilities are limited, the reuse of those sites is not possible. Considering that the dismantling of the old facility is indispensable for measuring, it is extremely significant.

[Brief description of drawings]

FIG. 1 is a perspective view and a sectional view showing an example of a surface steel sheet of the present invention.

FIG. 2 is a cross-sectional view showing a method of breaking a stud bolt weld portion when the surface steel sheet of the present invention is used.

FIG. 3 is a cross-sectional view showing a method of cutting a stud bolt welded portion when the surface steel sheet of the present invention is used.

FIG. 4 is a plan view and a cross-sectional view showing an arrangement state of a stud bolt and a shaver in a conventional steel plate concrete structure.

[Explanation of symbols]

 1 Surface Steel 2 Press Mark 3 Stud Bolt 4 Stud Weld 5 Impact Hammer 6 Drill 7 Drill Hole 8 Conventional Surface Steel 9 Shaver 10 Concrete

Claims (1)

[Claims] 1. A steel sheet for concrete structure surface steel sheet in which an attachment member embedded in filled concrete is attached to the inner surface of a surface steel sheet, wherein the surface steel sheet inner and outer surfaces corresponding to the attachment portions of the attachment member to the surface steel sheet are pressed. Surface steel sheet for concrete structure, characterized by having a mark.