JP3729795B2 - Net for joint fixing for polyethylene sleeve method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint fixing net for a polyethylene sleeve method.
[0002]
[Prior art]
Conventionally, in order to prevent metal pipes such as cast iron pipes buried in the ground from being corroded or electro-corrosion due to the influence of corrosive soil or groundwater, the pipes are covered with a polyethylene sleeve and multiple places are tightened with rubber bands. A so-called polyethylene sleeve method of embedding after fixing is performed.
[0003]
However, in this construction method, in a place where groundwater exists, groundwater that has entered the joint portion gradually accumulates and corrosion may occur. Therefore, in order to prevent the polyethylene sleeve from drooping due to the groundwater that has entered the lower surface of the pipe joint, as shown in FIGS. 5 and 6, a fixed net 7 is applied from below the polyethylene sleeve 1 covering the joint 2. . The fixed net 7 includes a circumferential tightening member 3 wound around the pipes on both sides of the pipe joint and a plurality of axial support members 4 arranged in the axial direction. The circumferential tightening members 3 and 3 are attached to the buckle 5. It is designed to be attached to the outer periphery of the joint by tightening and fixing.
[0004]
[Problems to be solved by the invention]
By the way, the above-mentioned net is conventionally formed into a net by fastening the circumferential tightening member 3 made of a flexible rubber material and the crossing portions 6 ... 6 of the axial support member 4, or the vertical and horizontal members are integrated by a mold. Depending on which one is to be molded, both the circumferential tightening member 3 and the axial support member 4 are easily bent and deformed, so that both the longitudinal and lateral members 3 and 4 are being fastened. In addition, the mutual positions are liable to be shifted, and there is a drawback that it takes time to temporarily support to prevent them.
[0005]
The latter integral molding has the disadvantage that a net mold is required and the manufacturing cost is high, and the pipe joint that can be applied to one type of net is determined within a certain range. There is a problem that the joint fixing net for the sleeve method cannot be widely applied to pipe joints of various sizes.
[0006]
The present invention solves the above problems, provides a joint fixing net for a polyethylene sleeve construction method that can be easily assembled and can be provided at low cost, and can flexibly respond even if there is a slight difference in size. It was made as an issue to do.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the joint fixing net for the polyethylene sleeve method according to claim 1 is a synthetic resin in which one of a pair of circumferential tightening members wound around and fixed to a pipe joint outer surface covered with a polyethylene sleeve is flexible. A polyethylene belt construction joint fixing net comprising a plurality of axial support members, the belt body made of which is made of a rubber band on the other side and arranged between the fastening members along at least the lower half bottom portion of the joint portion. Thus, the belt body is provided with fitting holes at appropriate intervals in the length direction, and the axial support member is a long body having a protrusion that fits into the fitting hole at least at one end. The axial support member is fixed to the circumferential tightening member in a state where the protrusion is fitted in the fitting hole.
[0008]
Therefore, according to the joint fixing net for the polyethylene sleeve method of claim 1, when the axial support member is attached to the circumferential tightening member, the projection of the axial support member is fitted into the fitting hole. Since it is good, even if it is a member which is easy to bend, mutual fixation can be performed reliably and positioning and attachment work become easy. The fixing means may be fixed by heat welding in addition to the night fastening fixing to the fastening member.
[0009]
Further, since the rubber band has elasticity, it is compressed and deformed by the tightening force of the tightening member, so that it does not move along the circumferential tightening member after fixing.
The polyethylene sleeve construction joint fixing net according to claim 2 is the polyethylene sleeve construction joint fixing net according to claim 1, wherein the rubber band of the circumferential fastening member is replaced with a belt made of synthetic resin having flexibility, Each of the pair of circumferential fastening members is a synthetic resin belt body having flexibility.
[0010]
In this case, since both the circumferential fastening members are made of synthetic resin, the axial support member can be accurately positioned and fixed to both circumferential fastening members by the fitting holes and the protrusions.
[0011]
According to a third aspect of the present invention, there is provided a joint fixing net for a polyethylene sleeve construction method, wherein the axial support member of the joint fixing net for the polyethylene sleeve construction method according to claim 1 or 2 is a long body made of synthetic resin. It is a flat rectangle, and the corner of the surface of the cross section with respect to the polyethylene sleeve on the outer periphery of the tube is a rounded corner.
[0012]
Accordingly, the contact of the axial support member supporting the sagging of the polyethylene sleeve with the polyethylene sleeve is eased, and the polyethylene sleeve can be prevented from being damaged due to the contact state.
[0013]
Further, since the front and back can be determined only by touching whether the corner is round or square, there is also an effect that the front and back can be easily determined in a place where visual observation is difficult.
Furthermore, there is also an effect that the mold can be easily removed due to the roundness during the molding.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
FIG. 1 is a plan view of a joint fixing net for a polyethylene sleeve method according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of a partially enlarged view of FIG.
[0015]
In FIG. 1, the joint fixing net 10 for the polyethylene sleeve method includes a pair of circumferential fastening members 11, 11 along the circumferential direction of the joint outer surface, and the fastening members 11, 11 along at least the bottom bottom of the joint 2. It is comprised from the several axial direction supporting member 12 ... connected in the cross | intersection state.
[0016]
The circumferential tightening member 11 is formed into a belt shape from a synthetic resin such as polyethylene having excellent chemical resistance and excellent tensile strength and elastic elasticity.
A buckle 13 is provided at one end of the circumferential tightening member 11, and if the other end 11a is inserted into the buckle 13 and tightened, a claw (not shown) provided in the buckle 13 is tightened in the circumferential direction. It is configured to be fitted and fixed so as not to come out by fitting into a concave groove (not shown) formed on the side surface of the member 11.
[0017]
The circumferential tightening member 11 is a rubber band 19 as shown on the other side. Needless to say, both the male and female direction tightening members 11 and 11 may be rubber bands 19, and conversely, both may be a flexible belt body made of synthetic resin.
[0018]
The rubber band is bent in a U-shape as shown in the figure, and a buckle 13 is attached to the open end side, and the loop portion 20 on the other side is hooked on the buckle 13 as shown in FIG.
[0019]
Further, the circumferential tightening member 11 as the belt body is formed with fitting holes 15 at appropriate intervals.
And the axial direction support member 12 cross | intersected and fixed to the circumferential direction fastening member 11 is made into the flat-plate-shaped elongate body made into the flat cross section as shown in a cross section in FIG. A protrusion 16 that fits into the fitting hole 15 is provided.
[0020]
The axial support member 12 preferably has rounded corners 12a and 12a facing the polyethylene sleeve 1 as shown in FIG.
This is because if the edges are formed like the other corners 12b and 12b, the polyethylene sleeve 1 may be cut as if it were cut with a blade depending on the contact state.
[0021]
Furthermore, if the corners are rounded in this way, in a work environment that can not be seen, such as when working behind the pipe on the back side of the pipe, or when working in a dark environment, The front and back can be distinguished only by touch.
[0022]
Further, when this long body is molded with a mold, it has an effect that the mold can be easily removed from a rounded corner and the molding can be simplified.
The axial support member 12 is fixed to the circumferential tightening member 11 by fitting the protrusion 16 into the fitting hole 15 and inserting the fastening member 17 into the insertion hole 12c formed in the axial support member 12 as shown in FIG. Then, the rear end portion 12d is turned around, both ends are passed through a tightening buckle 18 having an engaging claw 18a, and both are positioned and fixed in place by tightening, and the surplus portion 12e is cut off and attached.
[0023]
In addition to the fixing method using such a fastening member 17, both may be fixed by thermal welding in a state where the protrusion 16 is fitted and positioned in the fitting hole 15. This method is convenient because it enables mass production processing.
[0024]
Next, the use state of the joint fixing net for the polyethylene sleeve method will be described.
First, positioning is performed by fitting the protrusion 16 of the axial support member 12 into the fitting hole 15 at the important point of the circumferential tightening member 11, and then the tightening member 17 is inserted into the insertion hole 12c of the axial tightening member 12 with an arrow. As shown, the end is inserted through the buckle 18 from the end of the axial support member 12. In the case of heat welding, positioning is performed by fitting the protrusions 16 of the axial support member 12 into the fitting holes 15 at the important points of the circumferential tightening member 11, and then welding is performed by a heating device.
[0025]
On the other hand, the other end of the fastening member 17 is also inserted into the buckle 18 and pulled together, and the claws 18a and 18a in the buckle 18 are fitted and fixed to the concave and convex portions 17a of the fastening members 17 and 17.
[0026]
At this time, the circumferential tightening member 11 and the axial tightening member 12 are not easily displaced from each other due to the fitting of the fitting hole 15 and the protrusion 16, so that the tightening work by the tightening member 17 and the buckle 18 is also easy. It can be done without any displacement after tightening.
[0027]
The axial support member 12 is sequentially attached to the circumferential tightening member 11 in the same manner as described above.
Then, the circumferential support member 11 is attached to the other end side of the axial support member 12 in the same manner. If the circumferential support member on the other end side is a rubber band as shown in the drawing, After the direction support members 12 are attached to the one circumferential tightening member 11, the axial support members 12 are attached to the rubber band 19.
[0028]
In this case, since the other side of the axial support member 12 is fixed to the circumferential tightening member 11, the rubber band 19 can be easily attached. In addition, when the rubber band 19 is tightened by the tightening member 17, it is deformed to reduce its diameter as shown in FIG.
[0029]
Then, the axial support member is applied from the lower surface to the pipe joint portion covered with the sleeve by the polyethylene sleeve method, and the circumferential tightening member 11 is fastened and fixed to the outer periphery of the pipe.
[0030]
At this time, when the corner on the polyethylene sleeve side of the axial support member 12 is rounded as shown in FIG. 4, an accident that the polyethylene sleeve is damaged by a sharply sharp edge can be prevented.
[0031]
By tightening in this way, the circumferential tightening member 11 provides a watertight seal between the polyethylene sleeve and the outer periphery of the pipe, and the axial support member 12 prevents the polyethylene sleeve from sagging on the bottom surface of the pipe joint, thereby allowing ingress of groundwater. , Staying is also prevented.
[0032]
【The invention's effect】
As described above, the joint fixing net for the polyethylene sleeve construction method, which is attached to prevent the lower surface portion of the polyethylene sleeve placed on the pipe joint portion from sagging, can be easily separated by a combination of the fitting hole and the protrusion. In addition, it can be assembled to a size that can be applied to a pipe joint of any size by combining several materials, and has the effect of increasing versatility. In addition, by rounding the corners of the axial support member only on the polyethylene sleeve side, it prevents slippage and damage to the polyethylene sleeve. Furthermore, only one side of the corner is rounded so that it can be molded by a mold. It becomes easy, and it has various effects such as being able to be provided at a low cost.
[Brief description of the drawings]
FIG. 1 is a plan view of a joint portion fixing net for a polyethylene sleeve method according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of the partially enlarged view shown in FIG.
FIG. 3 is an explanatory perspective view of a main part showing a tightened state of a rubber band.
FIG. 4 is a cross-sectional view of an axial support member.
FIG. 5 is a side view of a conventional method.
6 is a cross-sectional view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polyethylene sleeve 2 Pipe joint 10 Polyethylene sleeve method joint part fixing net 11 Circumferential tightening member 12 Axial support member 12a Rounded corner 12b Rounded corner 13 Buckle 15 Fitting hole 16 Protrusion 17 Tightening member 18 Buckle 19 Rubber band

Claims (3)

One of a pair of circumferential fastening members wound around and fixed to the outer surface of a pipe joint covered with a polyethylene sleeve is a belt made of synthetic resin having flexibility, and the other is a rubber band, and at least at the lower half bottom of the joint And a joint fixing net for a polyethylene sleeve construction method comprising a plurality of axial support members arranged between the tightening members along the belt body, and fitting holes are formed in the belt body at appropriate intervals in the length direction. The axial support member is a long body having a projection formed in at least one end of the fitting hole, and the projection is fitted into the fitting hole. A joint fixing net for a polyethylene sleeve method, wherein the axial support member is fixed. 3. The joint fixing net for a polyethylene sleeve method according to claim 1, wherein the rubber band of the circumferential tightening member is replaced with a flexible synthetic resin belt body, and the pair of circumferential tightening members are both flexible. A joint fixing net for polyethylene sleeve construction, which is a resin belt. 3. The cross section of the axial support member of the joint fixing net for the polyethylene sleeve method according to claim 1 or 2 is a flat rectangular shape, and only the corner of the surface of the cross section around the polyethylene sleeve that is wound around the outer periphery of the pipe is rounded. A joint fixing net for the polyethylene sleeve method, which has a rounded corner.

Images