JPH0352831Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a connection structure for a split anti-corrosion cover used to coat and protect existing steel pipes such as pier supports.

[Prior art]

It is known that steel pipes such as pier supports found in ports and harbors are subject to intensive corrosion in their tidal and splash areas due to the action of macro batteries. In order to prevent this corrosion, a conventional practice has been to cover the steel pipe with a corrosion-resistant cover such as F.R.P., and to inject and harden a filling material such as mortar or concrete between the steel pipe and the cover.

However, in the case of an existing steel pipe, the cylindrical cover cannot be inserted into the steel pipe because concrete is built upward. For this purpose, the cover is divided into a pair of halves, a flange extending in the longitudinal direction is formed on each end edge, and the flanges are connected to each other by facing each cover half from the outside of the steel pipe.

However, since the flange portion of this type of split anti-corrosion cover protrudes outward, floating objects are likely to collide with the flange, potentially damaging the anti-corrosion cover.

For this reason, recently, methods have been adopted in which the flanges of the cover halves are eliminated and the edges are overlapped and connected, or the edges are abutted and then fixed using a band or a connecting metal fitting. However, since the cover halves are large in size and deformation, the reality is that this type of structure requires a considerable amount of effort to connect. Furthermore, if the edges are simply overlapped, a protruding portion will remain because the cover is thick.

In addition, attempts have been made to connect one end of each cover half with a hinge and open the other end to attach it to a steel pipe, but this structure makes it extremely difficult to seal the bottom of the anti-corrosion cover. Processing becomes necessary.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and its purpose is to eliminate any protrusion to the outside when the cover half is attached to the steel pipe, and to facilitate the mass production and installation of the cover half. The object of the present invention is to provide a connection structure for split-type anti-corrosion covers.

[Structure of the idea]

In order to achieve the above object, in the present invention, one of the connecting edges of the cover halves is provided with a thick portion and a notch that receives the other edge, so that when both edges are overlapped, the same circumferential shape is formed. Furthermore, each cover half has the same shape.

[Example of idea]

FIG. 1 shows a corrosion protection cover 10 to which the connection structure of the present invention is applied.

The anti-corrosion cover 10 is made of a corrosion-resistant material such as F.R.P, etc., and is attached to the steel pipe 12 with cover halves 10a and 10b having exactly the same shape facing each other as shown in FIG. Each cover half 10a,
The vertical dimension of the steel pipe 10b is such that it can cover the ebb and flow area and the splash area of the steel pipe 12.

As can be seen from FIGS. 2 and 3, one end edge 14a (right side in the figure) of the cover half 10a is thicker than other parts and has a notch 16 formed on the outside.
The cover half 10b is fitted into this notch 16 in an overlapping state. The depth of the notch 16 is approximately the same as the wall thickness of the cover half 10b, so that the half bodies 10a and 10b have the same circumference when stacked.

With this configuration, the anticorrosive cover 10 has no protruding portion, and since the cover halves 10a and 10b have the same shape, they can be mass-produced in advance at a factory.

A bushing 20 is screwed onto the edge 14a of the cover half 10a via a washer 18, and its tip protrudes outward. Further, a female threaded hole 22 is formed through the bushing 20. These bushings 20 and washers 18 are attached to the cover half 10 in advance.
A plurality of them are fixed at predetermined intervals in the longitudinal direction of the edge of a. Therefore, when the cover half 10b is fitted into the notch 16 via the rubber seal 24, the cover halves 10a and 10b are automatically positioned. All that is left is to install corrosion-resistant bolts 2 from the outside.
6 into the female threaded hole 22 of each bushing 20, and as can be seen from FIG.
to integrate.

The upper part of the anti-corrosion cover 10 is attached to the steel pipe 12 by a hanging fitting 30, as shown in FIGS. 4 and 5. The hanging fitting 30 has an L-shaped cross section, and its base end is fixed to the steel pipe 12 by means such as welding, and two nuts 32 are provided inside the hanging fitting 30. Therefore, while the anti-corrosion cover 10 is supported by a crane or the like, the upper end of the cover is hung by the hanging fitting 30.
If the anti-corrosion cover 10 is made to correspond to the steel pipe 12 and screwed onto the nut 32 from the outside with the bolt 34,
is fixed in place.

It should be noted that if the hanging fitting 30 is configured to protrude upward from the upper end of the anti-corrosion cover 10, the cover attachment work will be facilitated. Since the nut 32 is fixed to the hanging fitting 30 in advance, there is an advantage that the worker only has to insert the bolt from the outside. Each bolt 34
It is desirable that the head of the head be coated with anti-corrosion treatment in the same manner as described above.

A seal 36 is fixed to the inner periphery of the lower end of the anti-corrosion cover 10 by a rivet 38, as shown in FIG. This seal 36 is attached to each cover half 10.
a, 10b in a semicircular shape, and when both halves are assembled to the cylindrical anti-corrosion cover 10, the steel pipe 1
2 is sealed in an annular manner.

As can be seen from FIG. 1, a plurality of spacers 40 are provided at predetermined intervals on the inner surface of the anti-corrosion cover 10, and these spacers 40 serve to maintain an even distance between the anti-corrosion cover 10 and the steel pipe 12. . Since the shape and attachment means of the spacer 40 are well known, their details will be omitted.

After the anti-corrosion cover 10 is attached to the steel pipe 12 as described above, a filler 42 such as mortar is injected from above between the anti-corrosion cover 10 and the steel pipe 12 and solidified. The seal 36 (Fig. 6) at the bottom of the cover adheres to the steel pipe 12 side due to the weight of the filler 42, so
The filling material 42 will not leak out from below.

[Effect of idea]

As mentioned above, in the present invention, one end edge of the cover half is provided with a thick walled portion and a notch so that the end edge of the other cover half can be received, and both cover halves are configured to have the same shape. This eliminates the need for an outwardly protruding portion of the anti-corrosion cover and allows for mass production.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical cross-sectional view showing the entire anti-corrosion cover to which the present invention is applied, Fig. 2 is a plan view, Fig. 3 is an enlarged sectional view of the connecting portion of the cover halves, and Fig. 4 is a cross-sectional view of the anti-corrosion cover. FIG. 5 is a cross-sectional view taken along the line of FIG. 4, and FIG. 6 is a vertical cross-sectional view showing the bottom of the anticorrosion cover in a sealed state. 10... Anti-corrosion cover, 10a, 10b... Half cover, 12... Steel pipe, 14a, 14b... Edge, 16... Notch, 20... Bush, 26...
Bolt, 30... Hanging bracket, 36... Seal, 4
2...Filling material.

Claims (1)

[Scope of utility model registration request] A connecting structure of a split anti-corrosion cover consisting of a pair of cover halves, which is used to cover the ebb and flow area and splash area of an existing steel pipe from the outside, wherein one of the connecting edges of each of the cover halves, A notch is provided to receive the thick portion and the other edge, and both edges are overlapped to form the same circumference, and each cover half has the same shape. Connection structure of split anti-corrosion cover.