JP3009106U - manhole - Google Patents

Abstract

(57) [Summary] [Purpose] To enable efficient attachment / detachment of the lid. A tightening mechanism for connecting a pair of semi-circular tightening metal fittings 12a, 12b to each other so as to be rotatable with respect to each other, and pulling and fixing the respective end parts to the other end part. By using the provided open / close type clamp tool, the flange 6 provided at the end edge of the body 2 and the flange 7 provided at the end edge of the lid 3 are hugged from the outer periphery so that the body 2 and the lid 3 are connected to each other. did. [Effect] The lid can be efficiently attached and detached by operating the tightening mechanism, and the work is easier and the work efficiency and safety can be improved as compared with the conventional bolt tightening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a lid mounting structure in a manhole.

[0002]

[Prior art]

 In a manhole installed in a large container such as a tank, a flange is generally provided on the body and a lid, and the flange is connected to each other to attach the lid to the body. In this case, many bolts are usually used to connect the flanges to each other. For example, if the size is 600 A, 24 bolts are usually used.

However, attachment and detachment of such a large number of bolts requires a considerable amount of time. In addition, it is generally difficult to work efficiently because there are problems such as heavy equipment and parts to be handled and work in high places with poor footing. For a container that does not receive pressure, a latch type in which a plurality of U-shaped brackets are attached to the outer peripheral edge of the flange and the bolts attached to the brackets are tightened to be fixed is sometimes used. Was bad and it was difficult to work efficiently.

[0004]

[Problems to be solved by the device]

 The present invention has been made for the purpose of solving these problems and enabling the lid to be attached and detached efficiently.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the manhole of the present invention, a pair of substantially semicircular fastening metal fittings having a fastening groove with a tapered cross-section inside are rotatably connected to each other at one end. With the open-close type clamp equipped with a tightening mechanism that draws and fixes each end to the other end, the flange on the end of the body and the flange on the end of the lid are separated from the outer circumference. By hugging, the body and lid are connected to each other.

Further, the flange provided on the end edge of the body is provided with a strain prevention portion having a groove-like concave portion having a small thickness and a convex portion protruding in a flange shape having a large thickness. There is. Similarly, the flange provided on the edge of the lid is also provided with a strain prevention part having a thin groove-shaped concave portion and a thick wall-shaped flange-shaped convex portion. There is.

In the above structure, the tightening mechanism of the open / close type clamp is a tightening lever attached to a first fulcrum provided at an end of one tightening fitting so as to be rotatable about the first fulcrum. And a link mounted rotatably around a second fulcrum slightly closer to the handle than the first fulcrum of this tightening lever, and a tension bolt provided at the tip of this link. A bar-shaped nut that is fitted together, and an engaging portion that has a vertical groove that is provided at the end of the other fastening metal fitting and into which the tensile bolt is inserted, and a lateral groove that locks the bar-shaped nut. It can be

Further, in the above-mentioned tightening mechanism, a third fulcrum is provided at the tip of the link, and a tension bolt is attached to the third fulcrum so as to be rotatable about this third fulcrum, and a bar-shaped nut is attached to the tension bolt. It can be configured to be screwed.

[0009]

[Action]

 In this invention, since the flange of the body and the flange of the lid are held together by the open-close type clamp and the both flanges are joined together, the lid can be attached and removed efficiently with one touch, and the work can be done in a short time. Can be finished.

Further, when the flange is attached to the body or lid by welding, and when the body to which the flange is attached is welded to a tank or the like, distortion due to welding tends to occur in the flange. Will be difficult. However, by providing an anti-strain part on the flange as in this invention, the convex part of the anti-strain part reinforces and the heat dissipation is promoted, and the concave part hinders the heat conduction, resulting in the distortion of the flange. It will not occur.

Further, the one-touch operation can be easily performed by using the tightening mechanism of the open / close type clamp tool having the above-mentioned configuration.

[0012]

【Example】

 Next, an embodiment of the present invention will be described. 1 is a perspective view of the whole, FIGS. 2 and 3 are cross-sectional views of essential parts, FIG. 4 is a cross-sectional view of a flange provided with a strain prevention part, FIG. 5 is a plan view of an opening / closing clamp, and FIG. 6 is tightening. It is an operation explanatory view of a mechanism.

In FIG. 1, 1 is a manhole, 2 is a body of the manhole, 3 is a lid, 4 is an open / close type clamp, and 5 is a hinge mechanism. The lid 3 is attached to the body 2 via a hinge mechanism 5 so as to be openable and closable. As shown in FIG. 2, a flange 6 is provided on the edge of the body 2 and a flange 7 is provided on the edge of the lid 3. Are provided respectively. The seal ring 8 is sandwiched between the flanges 6 and 7, and the lid 3 is closed, and the open / close type clamp tool 4 holds the lid 3 from the outer periphery, so that the body 2 and the lid 3 are coupled to each other, and the upper portion of the body 2 is covered with the lid 3. It is designed to be sealed with.

The above-mentioned flanges 6 and 7 may be integrally formed at the same time when the body 2 and the lid 3 are manufactured, but in reality, they are separately manufactured and then attached to the body 2 and the lid 3 by welding. Usually, the flanges 6 and 7 are easily deformed due to distortion caused by welding. The body 2 is attached by welding its lower end to a tank or the like. However, when the body 2 is short, the flange 6 may be deformed due to the influence of welding at that time. These deformations are more likely to occur as the diameter increases, and if the deformations are large, it will not be possible to hug with the open / close clamp 4, and even if hugging is possible, the gaps between the flanges 6 and 7 are uneven. It will be difficult to secure and seal it securely.

Therefore, in this embodiment, the distortion preventing portion 9 as shown in the figure is integrally provided on the flanges 6 and 7, and the flanges 6 and 7 are welded to the body 2 and the lid 3 via the distortion preventing portion 9. I am trying to do it. 10 is a welded part. The anti-strain portion 9 is formed by forming a groove 9-shaped recess 9a having a thin wall thickness and a protrusion 9b having a thick wall and protruding like a brim on the outer surface along the circumference. There is.

FIG. 4 exemplifies the specific shape and dimensions of the flanges 6 and 7 provided with the strain prevention portion 9 in the case of a size of 600 A (inner diameter 600 mm). That is, the dimensions of each part are selected as shown in the drawing. For example, the total length is 50 mm, the diameter of the bottom part of the recess 9a is 610 mm, and the maximum outer diameter of the projection 9b is 625 mm. The wall surface of each flange 6 and 7 on the welded portion 10 side is inclined at 30 °. The flanges 6 and 7 are basically the same in shape and size, but the end face of the flange 6 is provided with a housing recess 6a for the seal ring 8.

The open / close type clamp tool 4 can be operated with one touch by connecting a pair of substantially semi-circular fastening fittings to each other at one end so as to be rotatable and providing a fastening mechanism at the other end. The clamp tool disclosed in Japanese Utility Model Publication No. 1-18949 is suitable. 5 and 6 show the structure and operation.

That is, 12a and 12b are substantially semicircular tightening fittings having tightening grooves 13a and 13b inside, and one end portions 14a and 14b are connected by a shaft 15 so as to be mutually rotatable. However, a tightening mechanism 20 is provided which acts so as to draw the other ends 16a and 16b toward each other. The tightening mechanism 20 is composed of a tightening lever 21, a link 22, a tension bolt 23, an engaging portion 24, and the like. The inner walls of the tightening grooves 13a and 13b have a tapered cross section which is inclined according to the inclination of the flanges 6 and 7, as shown in FIG.

The tightening lever 21 is attached by a shaft 26 to a portion of the end 16a of the tightening metal fitting 12a, which is slightly raised in the outer diameter direction, and is attached so that the shaft 26 is rotatable about the first fulcrum A. Has been. The link 22 is pivotally attached to a portion of the tightening lever 21 slightly closer to the handle 27 than the first fulcrum A by a shaft 28. The link 28 is rotatably attached with the shaft 28 as a second fulcrum B, and a tension bolt is used. The shaft 23 is attached to the tip of the link 22 by a shaft 29, and is rotatably mounted with the shaft 29 as a third fulcrum. A bar-shaped nut 30 is screwed onto the tension bolt 23 in such a posture that its longitudinal direction is orthogonal to the axial direction of the tension bolt 23.

On the other hand, the engaging portion 24 is formed on the end portion 16b of the tightening fitting 12b so as to face the end portion 16a in a state of being raised in the outer diameter direction, and the vertical groove 31 into which the tensile bolt 23 is inserted. And a lateral groove 32 in which the bar-shaped nut 30 is locked is provided. 34 is a lock piece, 35 is a lock pin, and the lock pin 35 is connected to the tightening lever 21 by a chain 35a.

FIG. 6 is an explanatory view of the operation of the tightening mechanism 20, and the solid line shows the tightened state. That is, the link 22 and the tension bolt 23 are in a tensioned state, and the straight line D connecting the bar-shaped nut 30, the third fulcrum C, and the second fulcrum B is located inside the first fulcrum A. There is. That is, at the time of tightening operation, the tightening lever 21 is rotated clockwise, and when the first fulcrum A crosses the straight line D, the tightening lever 21 exceeds the dead point and becomes a tightened state. The state is reliably maintained by fixing the tightening lever 21 with the lock piece 34 and the lock pin 35.

When tightening from the released state, the bar-shaped nut 30 may be brought into contact with the lateral groove 32 of the engaging portion 24 as shown by the chain line, and then the tightening lever 21 may be rotated clockwise. . At this time, since the link 22 and the tension bolt 23 are bent by the third fulcrum C, the bar nut 30 is temporarily locked to the engaging portion 24 in advance even when the tightening lever 21 is at the release position. Since the bar-shaped nut 30 is guided by the lateral groove 32 and automatically set to the optimum position when tightened, the bar-shaped nut 30 can be easily tightened with one touch. The tightening force may be set to an appropriate value by rotating the bar nut 30.

The releasing operation from the tightened state may be performed by rotating the tightening lever 21 counterclockwise, and the lid 3 can be easily attached and detached. However, if the flange is deformed by the heat generated by welding, it becomes difficult to use the open / close type clamp tool 4 having the above-mentioned structure, and the feature of one-touch operation cannot be exhibited. The distortion prevention unit 9 solves this problem, and plays an extremely important role in putting the present invention into practical use.

That is, as described above, the strain prevention portion 9 is provided with the concave portion 9a and the convex portion 9b, and the thick convex portion 9b reinforces to suppress the generation of the strain itself, and the convex portion 9b. 9b acts as a heat dissipation plate to promote heat dissipation, and the recess 9a prevents heat conduction from the welded part 10 toward the flanges 6 and 7. Further, the distortion preventing portion 9 increases the distance from the welded portion 10 to the flanges 6 and 7. As a result, the flanges 6 and 7 will not be distorted even if they are attached by welding, and the open / close type clamp tool 4 can be used without any trouble.

It should be noted that the flanges 6 and 7 can be welded in a factory with good conditions to suppress the strain to such an extent that there is no practical problem, and even if the strain is large, the strain can be removed by machining. Can be shipped from the factory. However, when the fuselage 2 is attached to the tank under construction, welding work is performed on site, and it is practically difficult to remove the strain by machining after welding. It is desirable to always provide the distortion prevention unit 9. FIG. 3 exemplifies such a case, in which the strain prevention portion 9 is provided only on the flange 6 of the body 2, and the strain prevention portion is not provided on the lid 3.

[0026]

[Effect of device]

 As is clear from the above description, the manhole of the present invention has a pair of substantially semicircular fastening fittings that are rotatably connected to each other at one end and each end is attached to the other end. An open-close type clamp with a tightening mechanism that pulls and fixes each other is held by hugging the flange on the edge of the body and the flange on the edge of the lid from the outer circumference. It is designed to be combined with.

Therefore, the lid can be attached and detached efficiently by operating the tightening mechanism of the open / close type clamp, and the work is easier and the work is completed in a very short time as compared with the conventional bolt tightening. In addition, it is possible to improve work efficiency and safety because it is not necessary to handle heavy members at a high place with poor scaffolding.

Further, since the flange is provided with the distortion preventing portion, the flange is less likely to be deformed due to welding, so that the open / close type clamp having good operability can be used without any trouble.

Further, by configuring the tightening mechanism of the open / close type clamp tool as described above, tightening and releasing can be performed with one touch, and the lid can be easily attached and detached.

In particular, a third fulcrum is provided at the tip of the link of the tightening mechanism, and a tension bolt is attached to the third fulcrum so as to be rotatable about this third fulcrum, and a bar nut is screwed to the tension bolt. In the case of the combined structure, since the link and the tension bolt are bent at the third fulcrum, the bar nut can be preliminarily locked in the engaging part in advance and the bar nut is guided by the lateral groove. Since it will be automatically set to the optimum position when tightening, it becomes easier to tighten with one touch.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of the embodiment.

FIG. 3 is a cross-sectional view of a main part of a modified example of the same embodiment.

FIG. 4 is a cross-sectional view of a flange provided with a strain prevention portion of the same embodiment.

FIG. 5 is a plan view of the opening / closing clamp tool according to the embodiment.

FIG. 6 is an operation explanatory view of the tightening mechanism of the open / close type clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Body 3 Lid 4 Open / close type clamp 6,7 Flange 9 Strain prevention part 9a Recess 9b Convex 12a, 12b Tightening fitting 13a, 13b Tightening groove 20 Tightening mechanism 21 Tightening lever 22 Link 23 Tension bolt 24 Engaging portion 26 First fulcrum 28 Second fulcrum 29 Third fulcrum 30 Bar nut 31 Vertical groove 32 Horizontal groove

Claims (5)

[Scope of utility model registration request] 1. A pair of substantially semi-circular tightening fittings having a tightening groove having a tapered cross-section inside are rotatably connected to each other at one end, and each end is connected to the other end. An open-close type clamp tool that has a tightening mechanism that draws and fixes the body and lid together by hugging the flange provided on the edge of the body and the flange provided on the edge of the lid from the outer periphery. A manhole configured to bond to. 2. A strain prevention portion having a thin grooved groove-shaped concave portion and a thick walled convex portion protruding in a brim shape is provided on a flange provided on an end edge of the body. The manhole according to claim 1. 3. A strain prevention portion provided on a flange provided on an end edge of the lid, the depression prevention portion having a groove-shaped recess having a small thickness and a protrusion protruding in a brim shape having a large thickness. The manhole according to claim 1 or 2. 4. A tightening lever for a tightening mechanism of the open-close type clamp, which is attached to a first fulcrum provided at an end of one tightening fitting so as to be rotatable about the first fulcrum.
A link rotatably mounted about a second fulcrum slightly closer to the handle than the first fulcrum of the tightening lever and a bar screwed to a tension bolt provided at the tip of the link. -Shaped nut, and an engaging portion having a vertical groove that is provided at an end portion of the other fastening metal fitting and into which the tensile bolt is inserted, and a lateral groove that locks the bar-shaped nut. The manhole according to any one of Items 1, 2 and 3. 5. A third fulcrum is provided at the tip of the link, and a tension bolt is attached to the third fulcrum so as to be rotatable about this third fulcrum, and a bar nut is screwed onto the tension bolt. The manhole according to claim 4.