JPH06158797A - Hot dip galvanized steel hatch cover - Google Patents

Abstract

PURPOSE:To maintain cut-off efficiency by using a single material of a hot dip galvanized steel plate to assemble a hatch cover, and holding and overlapping water tight materials between a lower water side steel plate and an upper water side steel plate to make bolted connection. CONSTITUTION:In a large-sized hatch cover assembling a spread single material of a hot dip galvanized steel plate 1, two steel plates 1-1 and 1-2 adjoined in the vertical direction of the drainage slope are formed. A lower water side steel plate 1-2 holds water tight materials 3 on a lower water side receiving material 2-2 of an angle steel, and they are clamped with bolts 4 to fix. In addition, the upper water side steel plate 1-1 is such that a thickness control plate 5 is mounted on an upper water side receiving material 2-1 to build the water tight materials 3 and that they are clamped with bolts 4 to fix. Accordingly, the expansion of the steel plates is absorbed by lap joint, and cut-off efficiency can be maintained for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-dip galvanized steel hatch cover provided on the roof of a building for carrying in or maintaining machinery in various plants such as nuclear facilities.

[0002]

2. Description of the Related Art Steel hatch covers are required to have rust-preventing effects and corrosion resistance, especially in facilities in coastal areas, so that it is required to use hot-dip galvanized steel materials.

However, as the size of a member made of hot-dip galvanized steel becomes larger, 440 to 440 are used in the plating process.
Residual stress generated when immersed in a high-temperature plating bath at 460 ° C. is released and strain easily occurs. This is especially noticeable in large assembly materials. For this reason, for large-sized assembly materials, a single material is hot dip galvanized and then assembled to form a hatch cover. However, roof hatch covers, especially large ones, have a problem in the method of treating the material expansion and contraction due to rain and temperature, and those using hot-dip galvanized steel materials are difficult to assemble.

[0004]

Conventionally, the method of waterproofing the plate joint portion when assembling a hatch cover using a single material of a steel plate which is hot-dip galvanized is between a backing material such as angle steel. , Water-tight materials such as neoprene rubber were sandwiched and fixed. This conventional method causes rain leakage when the watertight material is cracked due to deterioration of the watertight material or expansion and contraction of the steel plate due to temperature.

The present invention is intended to solve the above problems. An object of the invention is to propose a steel hatch cover that is hot-dip galvanized so that the joint portion of the steel plate can follow the expansion and contraction of the steel plate, and the waterproof property can be maintained for a long time.

[0006]

This hatch cover is a steel hatch cover made by assembling a single material of a hot-dip galvanized steel plate, in which two steel plate edges that are adjacent to each other in the vertical direction of the water gradient are provided. A water-tight material is sandwiched between the water-side steel plate and the water-side steel plate on the water-side member and the water-side receiving material that are juxtaposed, and the water side and the water side steel plates are respectively described above. A joint is formed by being fixed to the receiving members on the upper and lower sides of the water, and the expansion and contraction of the steel plate is absorbed at two receiving member intervals on the upper side and the lower side of the receiving members arranged in parallel. To do.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The hatch cover of the embodiment shown in FIG.
It is a large hatch cover that is constructed by laying and arranging a single material of a steel plate 1 having a length of m, a short side of 1 m, and a thickness of 6 mm and having a thickness of 6 mm.

FIG. 2 shows the joints of the long side edges of the two steel plates 1-1 and 1-2 adjacent to each other in the vertical direction of the water gradient.
The long side edges of the second steel plates 1-1 and 1-2 are substantially cross-sections composed of two chevron steel water-side receiving members 2-1 and underwater-side receiving members 2-2 arranged in parallel in the water gradient orthogonal direction. A lap joint is formed on the T-shaped receiving member 2.

That is, the underwater steel plate 1-2 has a watertight material 3 made of neonprene rubber sandwiched on an underwater support member 2-2, and a bolt 4 is tightened and fixed.
-1 is a thickness adjusting plate 5 on the water-side receiving material 2-1 which is commensurate with the thickness of the water-tight material 3 and the steel plate 1-2 on the water side.
Is placed, and the watertight material 3 extending on the steel plate 1-2 on the underwater side is laid thereon, and the steel plate 1-1 on the waterside is further stacked on the watertight material 3 and bolted to the waterside receiving material 2-1. 4 is tightened, fixed and jointed.

The receiving members 2 on the upper and lower sides of the receiving members 2 in the direction perpendicular to the water gradient, to which the steel plates 1 and 1 are fixed, are arranged side by side.
Although the extension destinations of 1 and 2 are not shown, they are attached to the building frame through long bolt holes. With this, the long span interval is maintained and fixed, and the elasticity of the member allows the interval between the receiving members 2-1 and 2-2 to be varied within a small range.

The joint parallel to the water gradient is shown in FIG. A watertight material 3 made of neoprene rubber is laid on a vertical receiving member 6 having a substantially T-shaped cross section composed of left and right chevron steel receiving materials 6 ', 6', and the left and right steel plates 1 and 2 adjacent to the watertight material 1,
The two edges that are bent at a right angle to the two and are raised are placed together.
A joint cover 7 having a substantially U-shaped cross section is covered from above so as to cover the combined edges, and bolts 4 are tightened from the lateral direction. The bolt 5 is tightened and fixed to '. A watertight material 3 is interposed between the lower edge of the joint cover 7 bent at a right angle and the rising corner of the steel plate 1.

As shown in FIG. 1, on the upper surface of the hatch cover, continuous reinforcing members 8 are attached and reinforced in parallel along the vertical direction of the water gradient, and the reinforcing members 8 are provided with lifting hardware 9. In order to lift this hatch cover by carrying in a machine, etc., the bolts 4 of the joint shown in FIG. 3 in the direction parallel to the water gradient are removed, and the lifting hardware 9 is used to hang it at four points to make a plurality of continuous water gradient directions. Lift the steel plate.

In the above embodiment, the planographic plate of the steel plate was used, but a folded plate may be used instead of the flat plate, and the hatch cover may be assembled in the same manner. By using the origami plate, it is possible to reduce the plate thickness and save the material.

[0014]

[Operation] This hatch cover has the above structure. When the steel plate expands and contracts as the temperature rises and falls, this hatch cover has two water-side and water-side sides of the receiving member under the lap joint between the edges of the adjacent steel plate in the water gradient vertical direction.
The receiving material interval fluctuates and the expansion and contraction stress is absorbed. The edge of the water-side steel plate forms a lap joint by sandwiching a watertight material on the edge of the water-side steel plate, and does not cause fine movement without damage and impair water stopping performance.

If the spacing between the parallel receiving members 6 ', 6'constituting the receiving member 6 in the water gradient parallel direction of the embodiment shown in FIG. 3 is made variable, the steel plate expands and contracts in the lateral direction. Can be absorbed in the space between the receiving members 6 ', 6'.

[0016]

The present invention is as described above, and the hatch cover assembled by using a single material of the galvanized steel plate absorbs the expansion and contraction of the steel plate by the lap joint between the steel plates, so that it can be used for a long time. It can maintain waterproofness.

[Brief description of drawings]

FIG. 1 is a plan view of a hatch cover of an embodiment.

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

FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1-1 ... water side steel plate, 1-2 ... water side steel plate, 2 ... receiving member, 2-1 ... water side receiving material, 2-2 ... water side receiving member, 3 ... watertight material, 4 ... Bolts, 5 ... Thickness adjusting plate, 6 ... Receiving member, 6 '... Receiving material, 7 ... Joint cover, 8 ... Reinforcing material, 9 ... Lifting hardware.

Claims (1)

[Claims] 1. A steel hatch cover formed by assembling a single material of a hot-dip galvanized steel plate, wherein two steel plate edges adjacent in the vertical direction of the water gradient are juxtaposed with a water-side receiving material and water. On the receiving member consisting of the lower side receiving material, the watertight material is sandwiched between the water side steel plate and the water side steel plate,
The water-side and water-side steel plates are respectively fixed to the water-side and water-side receiving members to form a joint, and the expansion and contraction of the steel plate is arranged in parallel with the receiving members. Steel hatch cover with hot dip galvanizing, which is designed to be absorbed by.