JPS6143035Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a tube mounting structure that electrically insulates and fixes the tube that penetrates into the sheath pipe and is fixed to the sheath pipe that penetrates the concrete wall. be.

[Technical background of the invention and its problems]

Right: When pipes introduced into a pit or building are supported on the concrete wall of the pit or building during piping work for pipelines such as oil, gas, or power cables, the sheath pipe is generally fixed through the concrete wall. A tube constituting the pipeline is passed through the sheath tube, and the tube is fixed and electrically insulated from the sheath tube.

Fig. 1 shows a conventionally adopted structure for attaching a sheath pipe to a sheath pipe fixed through a concrete wall. In Fig. 1, 1 indicates a concrete wall (for example, a wall of a concrete building) 2 is a sheath pipe fixed to the concrete wall 1; 3 is a fixed pipe (pipe constituting the pipeline) penetrated into the sheath pipe 2; a sheath is provided on the outer peripheral surface of the fixed pipe 3; An anticorrosion coating 4 is applied over the entire length of the pipe penetration part. The fixed tube 3 is then fixed to the sheath tube 2 through a resin mortar 5 having high strength and high insulation properties, such as epoxy resin, which is injected into the gap between the tube 3 and the sheath tube 2 and solidified. and is doubly insulated from the sheath pipe 2 by the anticorrosive coating 4 and the resin mortar 5. The reason why the fixed tube 3 is electrically insulated from the sheath tube 2 in this way is to insulate the tube 3 from the concrete wall 1 and thereby protect the tube 3 from cathodic corrosion. In addition, here, the fixed pipe 3 and the sheath pipe 2 are
The figure shows a case in which the pipes are double insulated with an anti-corrosion coating 4 and a resin mortar 5, but the fixed pipe 3 and the sheath pipe 2 are insulated only by the resin mortar 5 without applying the anti-corrosion coating 4. There are some things.

However, in the conventional pipe mounting structure described above, the sheath pipe 2 is fixed through the concrete wall 1.
After passing the sheath pipe 2 through a hole (not shown) drilled in the concrete wall 1, the gap between the outer peripheral surface of the sheath pipe 2 and the concrete wall 1 (the gap inside the hole) is filled with concrete or cement mortar. Since the sheath pipe 2 is fixed by the concrete wall 1, it is not possible to electrically insulate the sheath pipe 2 from the concrete wall 1. It is said that the reliability of the insulation of the fixed pipe 3 against the concrete wall 1 is low because it is only by the resin mortar 5 between it and the pipe 3 (or by the resin mortar 5 and the anti-corrosion paint if the anti-corrosion coating 4 is applied). In addition, when installing the pipe, it is necessary to fill the gap between the sheath pipe 2 and the concrete wall 1 with concrete or cement mortar, and to fill the gap between the sheath pipe 2 and the fixed pipe 3 with resin mortar 5. Another disadvantage was that the pipe installation work was time-consuming because the filling work had to be carried out twice.

[Purpose of invention]

This idea was devised in view of the above-mentioned circumstances, and its purpose is to electrically insulate not only the sheath pipe and the fixed pipe, but also the sheath pipe and the concrete wall, so that it can be connected to the concrete wall. It is an object of the present invention to provide a pipe mounting structure that can reliably insulate a fixed pipe with high reliability, and also allows the pipe mounting work to be carried out with good workability.

[Summary of the idea]

That is, in this invention, a plurality of resin mortar outflow ports are provided around the wall penetrating portion of the sheath tube, and the resin mortar to be filled into the gap between the fixed tube and the sheath tube is transferred from the resin mortar outflow ports to the outer periphery of the sheath tube. This structure also fills the gap between the surface and the concrete wall.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In Fig. 2, numeral 2 is a sheath pipe fixed to the concrete wall 1, and on both ends of the sheath pipe 2 are ring members 6, 6 formed by bending, for example, a round steel bar into a ring shape. It is welded and fixed perpendicularly to the axis of the sheath tube 2. Reference numeral 3 denotes a tube to be fixed that penetrates into the sheath tube 2, and a pair of ring members 7, located between the ring members 6, 6 on both ends of the sheath tube 2, are provided on the outer peripheral surface of the tube 3. 7 is welded and fixed obliquely to the axis of the tube 3 so that the inclination direction of both ring members 7, 7 is opposite, and furthermore, the ring An anticorrosive coating (eg, polyethylene coating) 4 is applied so as to cover the members 7, 7 as well. Reference numeral 5 denotes a resin mortar such as epoxy resin filled in the gap between the sheath tube 2 and the tube 3. Further, 8 is a flange fitted on the outer periphery of both ends of the sheath pipe 2 and transmits force in the tube axis direction and bending force to the concrete wall 1, and 9 is a flange reinforcing material for fixing the flange 8 to the sheath pipe 2. A flange fixing member 10 that also serves as a packing member has a cushioning property to seal between the flange 8 and the concrete wall 1. Also, 11
A resin mortar outlet is opened at the center of the wall penetrating portion of the sheath tube 2, and the outlet ports 11 are provided around the sheath tube 3 at approximately equal intervals.

The installation structure of this pipe is as follows: First, the above-mentioned flange 8 is welded to one end of the sheath pipe insertion hole 1a drilled in the concrete wall 1 via a flange fixing member 9, and a packing 10 is fitted inside the flange 8. Insert the sheath pipe 2 which has been inserted into the sheath pipe 2, fit the packing 10 and the flange 8 one after another into the end of the sheath pipe 2 that protrudes on the opposite side of the concrete wall 1, and attach this flange 8 to one end side of the sheath pipe 2. Flange 8
are strongly pressed against both wall surfaces of the concrete wall 1, and in this state, the flange fixing member 9 is brought into contact with the outside of the flange 8 fitted on the protruding end of the sheath tube, and the fixing member 9, the flange 8, and the sheath tube 2 are fixed. Then, the sheath pipe 2 and the flange 8 are welded together, and the sheath pipe 2 is attached to the concrete wall 1 with the flanges 8, 8 and the wall surface of the concrete wall 1 being watertightly sealed by the above-mentioned gaskets 10, 10. After fixing, this sheath tube 2
The resin mortar 5 is constructed by penetrating the fixed pipe 3 and filling the gap between the pipe 3 and the sheath pipe 2 with resin mortar 5.

To fill the resin mortar 5, both ends of the gap between the fixed tube 3 and the sheath tube 2 are closed with closing plates 12, 12, and a resin mortar injection tube 13 is placed in one of the closing plates 12.
This is performed by connecting the air vent cylinder 14 to the other closing plate 12 and injecting resin mortar from the resin mortar injection cylinder 13. and,
When resin mortar is injected into the gap between the fixed tube 3 and the sheath tube 2, this resin mortar will densely fill the gap between the fixed tube 3 and the sheath tube 2, and the resin provided in the sheath tube 2 will be filled with resin mortar. The mortar flows out around the sheath pipe 2 from the mortar outflow ports 11, 11, and also densely fills the gap A between the outer peripheral surface of the sheath pipe 2 and the concrete wall 1.

When the injected resin mortar solidifies, the fixed pipe 3 is fixed to the sheath pipe 2 in a watertight state and electrically insulated by the solidified resin mortar 5, and the sheath pipe 2 is also fixed to the concrete. It is fixed to the wall 1 in a watertight and electrically insulated manner by solidified resin mortar 5.

Therefore, according to this pipe mounting structure, not only the sheath pipe 2 and the fixed pipe but also the sheath pipe 2 and the concrete wall 1 are electrically insulated, and the fixed pipe 3 is highly reliable with respect to the concrete wall 1. In addition, filling the gap between the fixed pipe 3 and the sheath pipe 2 and the gap between the sheath pipe 2 and the concrete wall 1 with resin mortar is effective for ensuring insulation between the fixed pipe 3 and the sheath pipe. Since the resin mortar can be injected into the gap between the pipe 2 and the pipe 2 in one injection, the pipe can be installed with good work efficiency.

Moreover, in this tube mounting structure, since the ring member 7 is attached to the outer circumferential surface of the fixed tube 3 obliquely with respect to the axis of the tube 3, not only the axial force acting on the tube 3 but also the circumferential force Directional force (torsion force)
The resin mortar 5 can receive the force separately into an axial force and a circumferential force. Furthermore, in this tube mounting structure, a ring member 7 on the tube 3 side is attached not only to the fixed tube 3 but also to the sheath tube 2 on its inner periphery.
Ring members 6, 6 are installed across 7,
Moreover, since the ring members 6, 6 are installed perpendicularly to the axis of the sheath tube 2 so as to receive the strongest axial force, when an axial force is applied to the tube 3, the resin mortar 5 Not only this axial force but also the axial force applied to the resin mortar 5 when a circumferential force acts on the tube 3 (axial component force transmitted to the resin mortar 5 from the diagonal ring members 7, 7 on the outer circumference of the tube) It can also be strongly received by the ring members 6, 6 on the inner periphery of the sheath tube. Furthermore, when a circumferential force is applied to the tube 3, the circumferential force applied to the resin mortar 5 is due to the friction force caused by the surface contact of the resin mortar 5 with the inner circumferential surface of the sheath tube, as well as the force biting into the resin mortar 5. Since the ring members 6 and 6 are firmly restrained to the sheath tube 2, the resin mortar 5 is reliably received by the sheath tube 2.
There is no possibility that the tube rotates or moves relative to the sheath tube 2.

In addition, in the above embodiment, the anti-corrosion coating 4 is applied to the fixed pipe 3.
However, this anti-corrosion coating 4 may be omitted. Further, in the above embodiment, the ring members 6 and 7 are provided on the inner peripheral surface of the sheath pipe 2 and the outer peripheral surface of the fixed pipe 3. If the axial force or circumferential force acting on the ring member is relatively small, the ring members 6 and 7 may be omitted.

[Purpose of invention]

According to this invention, it is possible to electrically insulate not only the sheath pipe and the fixed pipe but also the sheath pipe and the concrete wall, and to reliably insulate the fixed pipe from the concrete wall with high reliability. Since the resin mortar can be filled in a single injection operation, the pipe installation work can be carried out with good work efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a tube attachment part showing a conventional tube attachment structure, and FIG. 2 is a sectional view of a tube attachment part showing an embodiment of the present invention. 1... Concrete wall, 2... Sheath pipe, 3... Fixed pipe, 5... Resin mortar, 11... Resin mortar outlet.

Claims (1)

[Scope of utility model registration request] A pipe mounting structure in which a sheath pipe is passed through and fixed to a hole in a concrete wall, and a fixed pipe is passed through the sheath pipe so that the fixed pipe is fixed to the sheath pipe while being electrically insulated by resin mortar filled in the gap between the fixed pipe and the sheath pipe, characterized in that a plurality of resin mortar outlets are provided around the wall penetration portion of the sheath pipe, and the resin mortar filled in the gap between the fixed pipe and the sheath pipe is also filled into the gap between the outer circumferential surface of the sheath pipe and the concrete wall from the resin mortar outlets.