JP2588264Y2 - Pipe with indicator - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a pipeline buried in the soil, for example, a telecommunications cable pipeline, which is regulated by the Road Law, and has a maintenance viewpoint that does not damage other companies' pipelines during repair or replacement. Therefore, the present invention relates to a display-provided conduit provided with a display substrate that allows the location of the conduit to be seen at a glance.

[0002]

2. Description of the Related Art Conventionally, when laying a conduit for a telecommunication cable in soil, a so-called open-cutting method has been used. In this method, the part where the pipe is buried is dug up from the ground surface,
After the pipe is buried, the soil is buried from above (Fig. 9). In the figure, reference numeral 11 denotes an excavating machine, 12 denotes a display substrate for cutting, and 2 denotes an underground conduit.

FIG. 10 is a perspective view of a pipeline 2 and a cross section thereof is shown in FIG. The structure will be described.
An anticorrosion layer (consisting of an adhesive layer 17, an anticorrosion layer 16, and an adhesion preventive layer 15) is provided on the entire outer periphery of the steel pipe 18, and a linear polyethylene protection layer 14 parallel to the longitudinal direction of the steel pipe 18 is further provided thereon. Protrusions 2A are provided at regular intervals.

[0004] A display board for identifying the type of the pipeline is attached to the pipeline 2 for the purpose of the regulation under the Road Law and the security. In the open-cutting method, since the pipeline is only installed in the excavation groove and the pipeline is not drawn into the soil, the problem of peeling of the display substrate at the time of laying does not occur, and the semicircle as shown in FIG. The display substrate 19 made of a rectangular shape is attached by simply fitting it directly into the conduit.

However, this excavation method has an adverse effect on the local environment due to noise, vibration, traffic congestion, and the like. In addition, there is a problem that it is uneconomical compared to the non-cutting method, and the non-cutting method has recently been increasing. However, there has been no urgent need for a pipeline with a display that can be applied to the non-drilling method until now.

[0006] In the non-cutting method, as shown in FIG.
3, the leading device 21 is attached to the soil by the main pushing device 20, and the pilot pipe 22 is pushed into the soil to reach the other reaching pile 24.
When the pilot pipe 22 reaches the pilot pipe 22, the pipe 2 is attached to the pilot pipe 22 as shown in FIG.
The pipe 2 is laid by pulling back the pipe 2.
In this method, a semicircular display substrate 19 shown in FIG. 12 as a display substrate is simply fitted into the pipeline 2 as in the conventional open-cutting method. The display substrate 19 peels off due to the generated friction. For example, the display substrate 19 is bonded and fixed using an adhesive. Even if the pipe 19 is tightened as will be apparent from FIGS. 10 and 11 (hereinafter abbreviated as the band fixing method), as shown in FIGS. Since the linear projections made of polyethylene are formed on the surface of the display substrate 19, the display substrate 19 is peeled off since the adhesion area with the display substrate 19 is small.

Further, even if the vinyl tape 26 marked as shown in FIG. 15 is adhered along the unevenness of the pipe surface (hereinafter, abbreviated as the tape attaching method), the rigidity of the vinyl tape 26 as shown in FIG. As shown in K, the tape returns to its original state, and a gap is formed between the pipe and the tape. Water and dirt 27 enter into the gap, and the tape is peeled off by the pushing force. The same applies even when a heat-shrinkable tube is used (hereinafter, abbreviated as a shrinkable tube fixing method). When a heat-shrinkable tube is used, a burner and a fuel cylinder are required as a heat source, so that the workability is poor and the cost is high. Further, a method of displaying a mark directly on the pipe by paint or the like is conceivable. However, in this case, the paint disappears due to friction with the soil and cannot be identified.

If the display substrate is thick, the earth pressure applied to the display substrate when the conduit is drawn in increases, and the display substrate is easily peeled. If the extensibility is small, the bending of the display substrate adhered to the irregularities of the conduit surface returns to the original state due to the rigidity, and a clearance is generated between the display substrate and the conduit. Also, in order to identify the pipeline,
It must be colorable and must have durability and corrosion resistance to stand in the soil for a long time.

[0009]

The problem to be solved is that the display substrate is not peeled even by the non-cutting method, the coloring is possible, and the display line has a corrosion resistance even when left in the soil for a long time. There is to get.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a pipe in which an anticorrosive agent layer is provided on the entire outer periphery of a steel pipe, and linear polyethylene projections parallel to the longitudinal direction of the steel pipe are provided on the pipe at regular intervals. A strip-shaped display substrate having a width of 60 to 100 mm, which is formed by providing a resin thin film and an adhesive layer on the front and back of a metal thin film having a thickness of 0.1 to 0.5 mm, and winding the same at regular intervals in the longitudinal direction of the conduit. It is.

[0011]

1 is a perspective view of a conduit with a display according to the present invention.
FIG. 2 is a sectional view of the present invention. The requirements of the display substrate to be solved in the present invention are as follows. 1. Be thin so that earth pressure does not work. 2. To fit the unevenness of the pipeline. 3. Colorable. 4. Durability and corrosion resistance. According to the present invention, a display substrate that satisfies the above-mentioned requirements can be achieved by the following configuration. In FIG. 2, the first layer 3 is a resin layer, and the type thereof is not particularly limited, but a vinyl chloride resin or the like is suitable. The resin layer 1 is colored differently depending on the type of conduit, such as red for a telecommunication cable conduit, green for a gas conduit, and orange for an electric conduit. Is stipulated by law.

The second metal thin film of the fourth layer is inserted so that the display substrate is not broken by frictional force in the soil. The metal thin film 4 needs to have spreadability in order to adhere the display substrate along the irregularities on the surface of the conduit, and specifically, it needs to have a tensile elongation of 30% or more.
The material is not particularly limited as long as the tensile elongation is 30% or more, but aluminum is particularly suitable economically. If the thickness of the metal thin film 4 is large, the earth pressure at the time of drawing in the pipeline increases, so that it is better to be thin, or if it is 0.1 mm or less, it will be cut due to insufficient strength. On the other hand, if it is 1 mm or more, it will be difficult to adhere along irregularities on the pipe surface due to rigidity. Also, the thicker, the higher the cost. Generally, 0.1 to 0.5 mm is appropriate.

The pressure-sensitive adhesive of the third layer of No. 5 is to be adhered to the irregularities made of polyethylene on the surface of the conduit. Naturally, a strong adhesive is suitable, and a synthetic rubber-based adhesive is particularly preferable. . The width of the display substrate is slightly different depending on the diameter of the conduit, but when the width is about 2 to 3 cm, it is easy to peel off because the adhesive surface is small. The larger the width is, the larger the bonding area becomes, so that it is difficult to peel off, but the cost increases. Generally 6-10c
m is appropriate.

The display substrate 1 having such a structure is obtained by coating a plastic 3 and an adhesive 5 on the upper and lower sides of the metal thin film 4 with an extrusion molding machine to obtain a long product, and cutting the product into an appropriate length. Thereby, it can be mass-produced.
However, the method is not limited to this method. For example, it can be manufactured by simply applying the plastic 3 and the adhesive 5 to the metal thin film 4 by hand.

The result when the display substrate is attached to a pipe and actually laid will be described. Figure 1 is 0.19m thick
m, width 70 mm, length 300 mm strip display substrate 1
Is wound around the pipe of 100 mm in outer diameter at an interval of 2 m. FIG. 5 is an explanatory diagram of an operation procedure for attaching the display substrate 1 to the pipeline. This will be specifically described below. First, in order to improve the adhesive strength between the conduit and the display substrate, the position where the display substrate is attached to the conduit is cleaned with a rag or the like to remove soil, water, and the like (FIG. 5A). Next, a display substrate is placed on the cleaning surface (FIG. 5).
B). Thereafter, the display substrate 1 is completely attached (FIG. 5).
C). The pipeline is rotated, and the above procedure is sequentially performed to complete the work of attaching the display substrate 1 (FIG. 5D). Here, the double roller 6 is newly devised in order to make the present invention, and as shown in FIG. 6, the surface of the roller 7 is provided with a groove which meshes with the groove on the surface of the pipeline, Further, two rollers are combined to improve work efficiency. FIG. 7 is a side view of the double roller.
10 is a bolt and a nut.

FIG. 8 shows the distance in which the display substrate could be laid without peeling off from the conduit in relation to the properties of the soil when the conduit with the display according to the present invention was laid by uncutting work. (Marked with ○). The N value on the vertical axis represents the relative value of soil hardness and tightness, and was measured by a penetration test (JIS A1219: Standard penetration test method for soil). For comparison, the results when the display panel is fixed by another method are also shown. Here, the symbol “☆” indicates the adhesive fixing method described in the prior art, the symbol “◇” indicates the band fixing method, the symbol “□” indicates the tape attaching method, and the symbol “△” indicates the heat shrinkable tube fixing method. As a result, in the conventional pipeline, all the display portions are peeled off within 70 m.
It can be seen that even if 0 m is laid, the display panel does not peel off.
In general, the distance from the starting stake to the reaching stake in the uncutting method is about 100 m.
Pipeline laying will be performed without any problem even in uncut work.

Table 1 shows the results of the durability test of the conduit with display according to the present invention. As a result, it was clarified that even in an accelerated test at a high temperature and a high concentration, no change in the appearance of the display portion with respect to water resistance, acid resistance, and alkali resistance was observed, and the display did not deteriorate for a long time in soil and did not fade.

[0018]

[Effects of the Invention] Since the display substrate of the conduit with the display of the present invention has the above-described structure, the display substrate does not peel off even in the case of non-cutting work, can be colored, and has excellent durability and corrosion resistance. Produces an effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conduit with a display according to the present invention.

FIG. 2 is a cross-sectional view of the display substrate of the present invention.

FIG. 3 is an enlarged front view of the display substrate of the display-provided conduit of the present invention.

FIG. 4 is a sectional view taken along line AA ^′ of FIG. 3;

FIG. 5 is an explanatory view of the operation procedure of mounting the display substrate of the present invention.

FIG. 5A is a diagram in which a part of a pipeline is cleaned with a rag or the like.

FIG. 5B is a diagram showing a state in which the display substrate is positioned on the cleaning surface of the pipeline.

FIG. 5C is a diagram illustrating a state in which the display substrate is pressed and moved back and forth by a double roller on the pipeline, and is stuck.

FIG. 5D is a state diagram in which the display substrate is attached to the conduit while rotating the conduit, and the attachment is confirmed.

FIG. 6 is a diagram showing a state in which a display substrate is pressed against a pipeline by a double roller.

FIG. 7 is a side view of the double roller.

FIG. 8 is a comparison diagram of a peeling test associated with a conventional means for attaching a display panel to a pipeline and a display panel of the present invention in a non-cutting work.

FIG. 9 is a schematic diagram of a digging work.

FIG. 10 is a perspective view of a pipe.

FIG. 11 is an enlarged partial cross-sectional view of a pipeline.

FIG. 12 is a perspective view of a conventional cutting display substrate.

FIG. 13 is an explanatory diagram of a first step of the non-cutting method.

FIG. 14 is an explanatory view of a second step of the non-cutting method.

FIG. 15 is an explanatory diagram of a state immediately after vinyl tapes are pressed into a pipe, a state in which vinyl tapes float with rigidity, and a state in which water, soil, and the like are put in gaps.

FIG. 16 is an endurance test result of the conduit with a display according to the present invention.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Tetsuno Tateno 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Kenichi Oka 1-16-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Inside Telegraph and Telephone Co., Ltd. (56) References Japanese Utility Model Showa 48-63908 (JP, U) Japanese Utility Model Showa 50-51172 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02G 9 / 00-9/12 H01B 13/00 529

Claims (1)

(57) [Scope of request for utility model registration] An anticorrosive agent layer is provided on the entire outer circumference of a steel pipe, and a linear polyethylene projection is provided on the steel pipe at regular intervals parallel to the longitudinal direction of the steel pipe. A display-equipped conduit characterized in that a strip-shaped display substrate composed of a metal thin film and an adhesive layer is wound at regular intervals in the longitudinal direction of the conduit.