JPH025194Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Field of industrial application) This invention is based on a web installed in a steel joint pipe that joins the pipe bodies when burying a sewage pipe that is pushed underground. This invention relates to a protective device for joint webs such as concrete pipes to prevent deformation.

(Prior Art) Conventionally, in order to maintain airtightness and watertightness, the steel joint pipes interposed at the connection points of the hume pipes, etc. in these propulsion construction methods, etc., have a joint pipe 10 as shown in Fig. 6. Slits 13, 13 are formed at predetermined equal intervals in the web 12 provided in the
It is known that the protective piece 14 is temporarily attached using a method such as the above, and the protective piece 14 is removed at the site.

(Problem to be solved by the invention) In the conventional technology mentioned above, even if the product has passed the accuracy and quality standards, it is difficult to load the product even when it is subjected to vibrations during transportation and slight shocks during loading and unloading. Depending on the state of the protective piece 14, it may be deformed and pressed to become smaller due to its own weight, etc., and the work of cutting out the protective piece 14 is very troublesome, and the slit 1
There were problems such as bending and damage of parts 3 and 13.

This idea was made in view of the problems with the conventional technology, and its purpose is to easily temporarily fit the protective equipment into the slit provided in the web. Therefore, we have attempted to provide a protective device for a joint pipe that prevents a perfectly circular web from deforming into an elliptical shape, joins joint parts accurately, and significantly facilitates construction, and has excellent watertightness and airtightness. It is something to do.

(Means for Solving the Problems) In order to achieve the above object, the protective device in this invention is made of synthetic resin, the insertion part and the locking collar are integrally molded, and the locking collar is integrally molded. The portion is formed into a substantially rectangular shape when viewed from the front, and stop portions that stop at the entrance of the slit are protrudingly provided on the left and right sides of the rectangle. The insertion portion is formed in the longitudinal direction perpendicular to the back surface of the rectangular shape, and the insertion portion is provided with a connecting portion to be inserted into the slit and opposing fitting grooves for holding the web. It is formed into an H-shaped cross section. Further, the tip of the insertion portion is formed into a circular shape for easy insertion into the slit.

The joint pipe to which the above protective equipment is attached is
The circular flange is formed with a circular web having a slit formed at a predetermined interval approximately in the center of the inner surface into which the connecting portion provided on the protective device is inserted.

(Function) The protective device is fixed by inserting the connecting portion of the protective device up to the locking flange into slits of a predetermined depth provided at several locations at equal intervals in the web of the joint pipe.
At this time, the fitting grooves provided on both sides of the connecting portion sandwich the front and back sides of the web edge piece of the slit. Therefore,
When the protector is inserted into the slit of the web, it prevents the slit portion from bending or deforming due to vibrations, impacts, etc. during transportation.

In this state, it is sent to the site and the protective equipment is removed during construction.

(Example) Next, an example of this invention will be described with reference to the drawings. The protective device 1 for preventing deformation of the steel joint pipe 10 interposed at the connection point of the adjacent concrete pipes 16, 16 is made of synthetic resin. The insertion portion 2 and the locking collar portion 3 are integrally formed. The locking collar portion 3 is formed into a substantially rectangular shape when viewed from the front, and has stop portions 8, 8 protruding from the left and right sides of the rectangle that stop at the entrances of the slits 13, 13 of the joint pipe 10, respectively. . Next, the insertion portion 2 is formed to protrude in the longitudinal direction from the back surface of the rectangular shape. Further, the insertion portion 2 is provided with opposing fitting grooves 5, 5 which sandwich the thickness of the connecting portion 4 inserted into the slits 13, 13 and the web 12 of the joint tube 10, and have an H-shaped cross section. It is formed in Furthermore, circular shapes 6, 6 are formed so that the tip of the insertion portion 2 can be easily inserted into the slit 13.

Next, a circular flange 1 is attached to the joint pipe 10.
The same circular web 12 is formed approximately at the center of the inner surface of the web 12, and several slits 13, 13, . . . are bored in the web 12 at equal intervals. code 1
As shown in FIG. 6, reference numeral 4 denotes a protective piece temporarily attached to the inside of the slits 13, 13, which is conventionally implemented, and the protective piece 14 is temporarily attached to the slit 13 with welded parts 15, This is designed to prevent deformation due to pressure, strain, etc. during transportation.

(Effects of the invention) This invention shows that when the protective equipment is fitted to the joint pipe as described above, it will not deform in any way even when subjected to vibrations during transportation or slight shocks during loading and unloading.
In addition, there is an effect that has not been seen in the past in that it can sufficiently cope with deformation of the slit due to its own weight, compressive stress, strain, etc., as in the past.

Since the insertion part and the locking flange are molded from synthetic resin, the protective equipment is very easy to manufacture, and the protective equipment with elasticity can be easily obtained. The rectangular locking flange makes it very convenient to insert the protective device into the slit. Furthermore, the rectangular stop portions protruding from the left and right sides of the locking flange have the effect of being able to reliably stop at the insertion position of the slit, and making it easy to manually insert and remove the protector from the slit. . Furthermore, since the back surface of the locking flange is formed into an H-shaped cross section with a connecting portion that is inserted into the slit at right angles and opposing fitting grooves that hold the web, the front and back surfaces of the opposing edges of the slit are formed. The fitting concave groove has the effect of reliably holding the slit and preventing bending and deformation of the slit. Further, the connecting portion that fits into the width of the slit provided in the protective device allows easy and reliable insertion and removal into the slit, and has the effect of preventing movement toward the edge of the slit.

Furthermore, since the tip of the insertion part is formed into a circular shape,
This has the effect of making it very quick and easy to insert the protective equipment into the slit.

[Brief explanation of the drawing]

Figure 1 is an overall perspective view of this invention, Figure 2 is a plan view, Figure 3 is a sectional view taken along the line A-A in Figure 1, Figure 4 is a perspective view of the joint pipe, and Figure 5 is a similar plan view. FIG. 6 is a partially cut-away front view of the conventional method, and FIG. 7 is a cross-sectional view of connected concrete pipes. 1 is a protective device, 2 is an insertion part, 3 is a locking collar part,
4 is a connecting portion, 5 is a fitting groove, 6 is circular, 8 is a stop portion, 10 is a joint pipe, 11 is a flange, 12 is a web, and 13 is a slit.

Claims (1)

[Scope of utility model registration request] A circular web 12 is formed on the flange 11 of the joint pipe 10 interposed at the joining point of the concrete pipes 16, 16, with several slits 13, 13 provided at predetermined intervals approximately in the center of the inner surface. Ebu 1
In the protective device that is detachably fitted into the slits 13 and 13 of No. 2, the protective device 1 has an insertion portion 2 and a locking flange 3 integrally molded with synthetic resin, and the locking flange 3 has the following features: It has a substantially rectangular shape when viewed from the front, and stop portions 8, 8 that stop at the entrances of the slits 13, 13 are provided protrudingly on the left and right sides of the rectangle, and the insertion portion 2
are formed in the longitudinal direction at right angles to the back surface of the rectangular shape, and the insertion part 2 has a connecting part 4 to be inserted into the slit 13 and opposing fitting grooves 5, 5 to sandwich the web 12. A protective device for a web for a joint such as a concrete pipe, characterized in that the insertion portion 2 is formed into an H-shaped cross section, and the tip of the insertion portion 2 is formed into a circular shape 6, 6.