JPH0254474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a wall penetrating structure of a buried double heat supply pipe.

[Conventional technology]

The buried heat supply pipe penetrates the concrete wall 100 with a structure as shown in FIG.
That is, a hole is made in the wall 100 and the wall penetrating sleeve 101 is fixed therein. On the other hand, in the heat supply pipe, a heat insulating material 103 is wrapped around a main pipe 104 that transports heat, this is inserted into the outer pipe 102, and the main pipe 104 is supported inside the outer pipe 102 by an end plate 105 midway. It has a double tube structure. The double pipe 102, 1 is inserted into the wall penetrating sleeve 101.
04, and the outer tube 102 and the wall penetrating sleeve 1.
01 and is completely fixed by filling mortar 106. Furthermore, asphalt coating 107 is applied to conventional heat supply pipes, for example, as shown in FIG. 2, around the outer pipe 102 on the buried side b.

However, in the above-mentioned wall penetrating structure, the main pipe 1
04, the following problems occur because the outer tube 102, wall 100, etc. are completely fixed at the penetrating portion. That is, when the temperature rises, the higher the temperature of the transfusion fluid in the main pipe 104, the greater the amount of axial extension of the main pipe 104 and the outer pipe 102 due to heat. By restraining the wall 100, a large load is applied to the wall 100, and sometimes cracks may occur in the wall 100.

When the ground subsides, the stress generated in piping due to ground subsidence is extremely large in areas where there is a large amount of relative displacement, such as near wall penetration. If the wall penetration part is completely fixed, the amount of ground subsidence (= relative displacement) will be 2 to 3 cm.
The stress generated in the heat supply pipes 102 and 104 exceeds the yield point, and the vertical load and moment generated in the wall penetrating portion are also large, which not only plastically deforms the pipes 102 and 104 but also adversely affects the wall 100. give.

For this reason, in Utility Model Application No. 55-165177,
A wall penetrating structure of a tube as shown in the figure is disclosed. That is, around the outer tube 102 within which the main tube 104 is supported by the end plate 105,
The stuffing box 1 is fitted onto the outside, the gland packing 2 is packed between it and the outer tube 102, and the gland presser 3 is fitted, thereby bringing the gland packing 2 into pressure contact with the outer tube 102. The fitting structure is such that the sluffing box 1 is provided with a female threaded portion and the gland holder 3 is provided with a male threaded portion, and both threaded portions are screwed together.

When such a structure is used for the wall-penetrating portion of the double heat supply tube, the axial extension of the outer tube 102 due to heat acts directly on the wall 100 due to the sliding of the gland packing 2. There is no risk of cracks occurring. In addition, since the outer pipe 102 is not completely restrained due to the gland packing 2, the stress generated in the heat supply pipe and the moment applied to the wall during ground subsidence are reduced, and the heat supply pipe 102 is reduced by 3 to 4 times compared to the conventional structure. The amount of ground subsidence can be tolerated.

[Problem that the invention seeks to solve]

However, even with the structure disclosed in the above publication, as shown in FIG.
04 are connected through the end plate 105, and the following problems occur because they are not thermally or electrically insulated. That is, (1) Problems caused by the fact that the outer tube 102 and the main tube 104 are connected by the end plate 105 and are not insulated. Because the heat of the main tube 104 is transmitted to the outer tube 102 through the end plate 105, Not only will there be a large loss in the heat that should be supplied, but the ambient temperature inside the room will also rise rapidly.

Further, since the heat transmitted to the outer tube 102 is transmitted to the gland packing 2 with almost no attenuation, the gland packing 2 is highly likely to be deteriorated and hardened by the heat, thereby promoting deterioration of the gland packing 2.

Conventional heat supply pipes 102 and 104 are often coated with asphalt coating (not shown in FIG. 5, but as shown in FIG. 2, for example), Due to the lack of asphalt coating 107
There is a possibility that the outer tube 102 will be subjected to pitting corrosion due to melting and local battery action occurring near the wall penetration.

(2) Problems caused by the fact that the outer tube 102 and the main tube 104 are connected by the end plate 105 and are not electrically insulated.

The outer pipe 102 and the main pipe 104 are the end plate 1
05, the main pipe 104 is required in addition to the outer pipe 102 in the electrolytic protection range, and therefore the electrolytic protection cost cannot be reduced.

The present invention has a structure with high heat insulation and electrical insulation properties for the support structure at the wall penetration part, so that
This is an attempt to solve the above problems.

[Means for solving problems]

Therefore, the present invention has an outer tube 1 as shown in FIG.
02 penetrates the wall penetrating sleeve 101, the stuffing box 1 is fitted around it, and the outer tube 1
Place ground packing 2 between 02 and stuffing box 1. Then, the gland presser 3 is inserted from the indoor side a, and the gland packing 2 is tightened to bring it into close contact with the outer pipe 102 and the stuffing box 1.

Further, a non-shrinkable insulating mortar 4 is filled between the stuffing box 1 and the wall penetrating sleeve 101.

Furthermore, the main pipe 104 around which the heat insulating material 103 is wrapped
For example, by supporting a heat insulating and electrically insulating support plate at a suitable position away from the penetration part of the wall 100, the pipe is arranged so as not to come into contact with the inside of the outer pipe 102.

[Effect]

In the wall penetrating structure of the present invention having the above-described structure, the main pipe 104 and the outer pipe 102 are provided with heat insulation properties and electrical insulation properties, for example, at appropriate positions away from the wall 100, as described above. By using a non-contact configuration such as supporting with a support plate,
04 is made free from the outer tube 102, the insulation between them is improved, and the space between them is electrically insulated. Further, by filling the non-shrinkable insulating mortar 4, the stuffing box 1 is completely fixed to the wall penetrating sleeve 101, watertight is prevented, and the space between them is electrically insulated.

In addition, since the gland packing 2 is tightly tightened to the outer circumference of the outer pipe 102 by the stuffing box 1 and the gland presser 3, it prevents water from entering from the buried side b to the indoor side a, and also prevents the outer pipe 102 from completely closing. It is not fixed, but is allowed to slide in the axial direction (axial displacement) and pivot moment (angular displacement) to some extent.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 shows an embodiment of the invention. still,
101 is a wall penetrating sleeve made of steel that is bored through the wall 100 and fixed therein.

In this embodiment, first, a steel tubular stuffing box 10 having a flange portion 11 at the rear end is inserted from the indoor side a toward the buried side b, and around the outer tube 102 penetrating into the wall penetrating sleeve 101. The stuffing box 10 is fitted onto the outside.

In addition, the outer tube 102 and the stuffing box 10
I have multiple Grand Patsukin 20 packed in between. This gland packing 20 is a fibrous packing containing graphite, and in addition to stopping water, it allows the outer tube 102 to be displaced in the axial direction and angularly.

Then, a steel gland presser 30 is inserted from the indoor side a, and the gland packing 20 is tightened in the stuffing box 10.
2 outer peripheral surface and the stuffing box 10 inner peripheral surface. Therefore, this gland presser 30 is made of a tubular body having a diameter that can penetrate between the outer tube 102 and the stuffing box 10, and is provided with a presser flange portion 31 facing the flange portion 11 of the stuffing box 10 at the rear end. There is. FIG. 4 shows a side view of this embodiment as viewed from the indoor side a, and as is clear from the figure, the gland presser 30 is divided into two halves 30a, 30.
b, and the contact surface 32, 3 of the two halves
3 are joined together by assembly bolts and nuts 34 and are integrated. Also, ground presser 30
The presser flange portion 31 of the stuffing box 10 is engaged with the flange portion 11 of the stuffing box 10 using a plurality of tightening bolts and nuts 35, and by tightening the tightening bolts and nuts 35, the gland packing 20 is tightened. be able to.

In addition, a non-shrinkable insulating mortar 440 made of resin mortar is filled between the stuffing box 10 and the wall penetrating sleeve 101 to completely stop water while electrically insulating the space between them. A stuffing box 10 is fixed. In this embodiment, stop rings 41 made of steel rods are attached to the outer circumferential surface of the stuffing box 10 and the inner circumferential surface of the wall penetrating sleeve 101, respectively, to improve the reliability of complete fixation and water stoppage.

Furthermore, the main pipe 104 wrapped with the heat insulating material 103 and the outer pipe 102 are configured in a non-contact manner, electrically insulating the space between them, and achieving uniform heat insulation performance.
As for this non-contact configuration, in this embodiment, the wall 10
An annular support plate (not shown) having heat insulation and electrical insulation properties is fitted between the outer pipe 102 and the main pipe 104 at an appropriate position away from the penetration part of 0. I am forced to insert it. The material for the support plate is preferably asbestos or the like. Along with such improvement in insulation performance, in this example, polyethylene lining 50 with good cathodic protection performance, which had been used only as a coating for hot water transport pipes, was used.
is painted on the outer peripheral surface of the outer tube 102, and the heat supply tube 10
This dramatically improves the service life of 2,104.

In this embodiment, the stuffing box 10
A rubber dust seal 21 is built inside the tip of the buried side b to keep out dust.
Further, a shelling tube 2 is provided between the outer circumferential surface of the tip of the stuffing box 10 on the buried side b and the coated surface of the polyethylene lining 50 on the outer circumferential surface of the outer tube 102.
2 is bonded to further enhance the dust-proofing and water-stopping effects.

In addition, in the event that water leakage occurs due to aging of the gland packing 20, as shown in Figure 5,
Stuffing box 10 and ground presser foot 30
In the case of a structure in which the gland packing 20 is tightened by a screwing action with
Since the gland packing 20 is tightened by tightening the nut 35, the gland packing 20 can be re-tightened by further tightening the tightening bolt/nut 35, as shown in FIG. Compared to the above structure, the water stopping effect can be easily improved.

〔Effect of the invention〕

According to the wall penetrating structure of the present invention having the above-mentioned effects, the heat generation effect between the main pipe and the outer pipe is improved at the wall penetrating part, and the heat of the transported fluid, which is largely attenuated by the heat insulating material, is transferred to the outer pipe. Because almost no heat is transferred to the sides,
Without contributing to the aging of Grand Patskin,
This has the effect of minimizing the effects of heat on the indoor side and the buried side. In addition, because the outer pipe and the main pipe are electrically insulated, the scope of cathodic protection is limited to the outer pipe, reducing construction costs.
Furthermore, since electrical insulation is achieved between the outer tube and the wall-penetrating sleeve using non-shrinkable insulating mortar, there is also the advantage that there is no pitting corrosion of the outer tube due to local battery action at the wall-penetrating portion.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the configuration of the present invention, Fig. 2 is a schematic diagram showing a wall penetrating structure of a conventional buried heat supply double pipe, and Fig. 3 is a sectional view showing an embodiment of the present invention. FIG. 4 is a side view of this embodiment, and FIG. 5 is a schematic diagram showing a conventional double pipe wall penetrating structure using a gland packing. In the figure, 1 and 10 are stuffing boxes,
2, 20 are gland packings, 3, 30 are gland holders, 4, 40 are non-shrinkable insulating mortar, 100
101 is a wall penetrating sleeve, 102 is an outer tube,
103 is a heat insulating material, 104 is a main pipe, and 105 is an end plate.

Claims (1)

[Claims] 1. Pass the outer tube into which the main tube wrapped with heat insulating material has been inserted into a wall-penetrating sleeve fixed to a hole in the perforated wall, fit a stuffing box around the outer tube, and In the wall-penetrating structure of the buried heat supply double tube, which is filled with a gland packing and tightened with a gland holder, non-shrink insulating mortar is filled between the stuffing box and the wall-penetrating sleeve, and the main tube is inserted into the outer tube. A wall-penetrating structure of underground heat supply double pipes, characterized in that the pipes are arranged so as not to come into contact with the pipes.