JPH04258407A - Long-span shell gate - Google Patents

Abstract

PURPOSE:To inhibit the actual quantity of a door body warped within the range of the allowable compressive clearance of a watertight rubber by the quantity of deflection by a camber and its own weight, to prevent warpage exceeding the deformation clearance of the watertight rubber and to eliminate the need for water spray to the door body even when the door body is warped by the temperature difference of an upper surface plate and a lower surface plate. CONSTITUTION:A camber 4a is formed so that the central section of the lower edge of the front skin plate 4 of a door body 1 is projected downward only by a fixed quantity while a watertight rubber is disposed extending over the overall length of the lower edge section of the front skin plate 4 in the lower edge section of the front skin plate 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to long span shell gates.

0002

[Prior Art] Normally, the upper part of the door body of a long-span shell gate is exposed to direct sunlight, and the upper plate exposed to the air expands due to thermal expansion, while the lower plate below the watertight side is affected by the heat. Therefore, there is a difference between the length of the top plate and the length of the bottom plate.

[0003] For this reason, there was a problem in that the center of the door body warped upward, creating a gap at the bottom. Conventionally, the following methods have been adopted to deal with this problem.

[0004] The bottom watertight rubber is made thicker, that is, the compression margin of the rubber is increased, so that the elasticity of the rubber closes the gap that occurs at the bottom. ■The top plate of the door body was water-tight, eliminating the temperature difference between the top plate and the bottom plate, and preventing any gaps from forming at the bottom.

[0005]

[Problems to be Solved by the Invention] However, the above conventional measures have the following problems. ■If the watertight rubber at the bottom is made thicker, it will cause vibration and damage the gate body, so normally it can only be made thicker to about 1cm. Therefore, in the case of a gate with a very long span, it will inevitably occur at the bottom. There is a problem that the gap cannot be completely closed.

[0006] When water-tightening the top plate of the door, it is necessary to provide water-tight equipment, the running cost is high, and the appearance of the gate itself is poor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a long-span shell gate that can solve the above problems.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the long span shell gate of the present invention has the lower edge of the front skin plate of the door body, so that the center of the lower edge protrudes downward by a predetermined amount. In addition to providing a camber, watertight rubber is provided along the entire length of the lower edge of the front skin plate.

[0009]

[Operation] According to the above structure, a camber is provided at the lower edge of the front skin plate of the door body so that the center of the lower edge protrudes downward by a predetermined amount, so that the upper and lower surfaces are connected. Even if the door body warps due to a temperature difference, the actual amount of warpage of the door body can be suppressed within the allowable compression range of the watertight rubber due to the camber and the amount of deflection due to its own weight.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. 1 to 3, reference numeral 1 denotes a door body of a long-span shell gate with a trapezoidal cross-sectional shape, including an upper surface plate 2, a lower surface plate 3, and a front skin plate (hereinafter referred to as skin plate) 4. and a rear plate 5.

The lower edge of the skin plate 4 is cambered so that the center of the lower edge protrudes downward.
Warp) 4a is provided. That is, it is shaped like an arc with a very large radius of curvature.

Further, a watertight rubber 7 is attached to the front side of the lower edge of the skin plate 4 via a mounting member 6 over the entire length thereof. And furthermore, this watertight rubber 7
A cylindrical space 7a is formed in the lower part of the cylindrical space 7a, and both ends thereof are closed.

Next, specific examples of the amount of warping of the door body, the amount of deflection due to its own weight, and the amount of necessary camber will be explained based on FIG. The conditions for determining the camber are as follows.

Conditions Door width: L = 4500cm Door height: H = 450cm Coefficient of thermal expansion of steel: α = 1.2 x 10-5°C Door weight: W
= 300 x 103 kg Door body moment of inertia: I = 130 x 106 cm4
Elastic modulus of steel: E=2.1×106 kgf/cm2
The amount of warpage (δt) of the door body is determined by the following formula (2).

[0015] δt =R-r‥‥‥■ In the above formula (2), R is the radius of curvature of the bottom plate when the door body is warped, and is determined by the following formula (2).

R=L/Θ‥‥■ However, Θ=ΔL/H. ΔL=α×L×Δt ΔL: The amount of elongation r due to the temperature difference (Δt) of the door body is the vertical distance from the center of curvature to the bottom end of the bottom plate, and is determined by the following formula (2).

r=R×cos(Θ/2) Next, the amount of deflection (δw) of the door body due to its own weight is determined by the following equation (2). δw = (5 x W x L4) / (384 x E x I)...
■Also, the watertight rubber is provided so as to protrude 1.0cm from the skin plate, but if the compression required to prevent watertightness is 0.2cm, the amount of deformation that can be caused by the warpage of the door body is 0. .8cm.

Table 1 below shows the amount of warpage (δt) and the amount of deflection due to own weight (δt) with respect to the temperature difference between the top plate and the bottom plate.
δw ), the amount of deformation of the watertight rubber (δg), the actual amount of warpage (δ), and the required amount of camber (δc).

[0019]

[Table 1]

From Table 1 above, for example, when the temperature difference is 50° C. (the lower plate is at 20° C. and the upper plate is at 70° C.), it is necessary to provide a camber amount of 1.3 mm at the lower end of the skin plate.

[0021] Since a cylindrical space 7a is provided inside the watertight rubber 7, if the compression amount is large, the air pressure inside will increase, and therefore the cylindrical space in other parts will increase. The expansion force of 7a is increased, and the watertight effect is further exhibited.

By the way, in FIG. 1, the lower edge of the front skin plate 4 is shown as a circular arc, but even if it is made into a polygonal shape along the circular arc, for example, the same effect as in the above embodiment can be obtained.

[0023]

As described above, according to the structure of the present invention, the lower edge of the front skin plate of the door body is provided with a camber so that the center of the lower edge protrudes downward by a predetermined amount. Even if the door body warps due to the temperature difference between the face plate and the bottom plate, due to the camber and the amount of deflection due to its own weight,
The actual amount of warpage of the door body can be suppressed within the allowable compression range of the watertight rubber, and therefore, unlike conventional methods, the door body does not warp beyond the allowable deformation range of the watertight rubber.
There is also no need to spray watertight the door body.

[Brief explanation of the drawing]

FIG. 1 is a front view of a door body in one embodiment of the present invention.

FIG. 2 is a side view of a door body in one embodiment of the present invention.

FIG. 3 is an enlarged side view of the lower part of the skin plate of the door body in one embodiment of the present invention.

FIG. 4 is an explanatory diagram for determining the amount of camber of a door body in one embodiment of the present invention.

[Explanation of symbols]

1 Door body 2 Top plate 3 Bottom plate 4 Front skin plate 7
Watertight rubber 7a cylindrical space

Claims (1)

[Claims] Claim 1: A camber is provided at the lower edge of the front skin plate of the door body so that the center of the lower edge protrudes downward by a predetermined amount, and the entire length of the lower edge of the front skin plate is watertight. A long span shell gate characterized by rubber.