JP2698924B2 - Construction method of anticorrosion pipeline - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for constructing a corrosion-resistant pipe. More specifically,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an anticorrosion pipeline which can easily and easily construct an underground pipeline having excellent acid resistance and chemical resistance when performing sewage or factory drainage.

[Conventional technology]

When constructing underground pipelines such as sewage or factory drainage using concrete pipes, excavation tunnels are used to excavate tunnels, lining their inner walls with concrete members, and solidifying the inner walls with concrete. A secondary lining method of covering a wall surface with a synthetic resin sheet has been conventionally known.

[Problems to be solved by the invention]

In the case of the above-mentioned conventional construction method, the inner wall of the excavated tunnel is first covered with a concrete member to form a concrete pipeline. Next, the inner wall surface is covered with a synthetic resin sheet, and concrete is cast between the synthetic resin sheet and the concrete wall surface to form a pipeline, which has a problem that it takes time and effort.

The present invention manufactures an arc-shaped segment in which a synthetic resin sheet is stuck on the inner surface and connects the segment in a circumferential direction and an axial direction, so that a pipe line rich in acid resistance and chemical resistance can be easily constructed. It is like that. In addition, by inserting a synthetic resin strip at the connecting part of the segment and joining it to the synthetic resin sheet of the segment, it prevents intrusion of fluid from the connecting part and creates a pipeline with excellent acid resistance and chemical resistance. The present invention provides a method for constructing a corrosion-resistant pipe.

[Means for solving the problem]

The construction method of the corrosion-resistant pipe according to the present invention is as follows. First, a number of segments are manufactured. The segment has an arc shape such that a synthetic resin sheet having a large number of anchors is attached to the inner surface of the concrete outer layer and a plurality of cylindrical members are formed when connected in the circumferential direction. At the construction site, the segments are sequentially connected in the circumferential direction and the axial direction, and at each connecting portion of the segments, a synthetic resin strip is interposed in a gap previously formed between the concrete layer and the synthetic resin sheet to be adjacent to each other. It is characterized in that it is joined over the synthetic resin sheet of the segment to be joined.

[Function of the invention]

In the present invention, since the segments have an arc shape, the segments are not bulky, and many of them can be stored and transported. The segments are connected sequentially in the circumferential direction and the axial direction to form a cylindrical conduit. Further, a synthetic resin sheet is stuck on the inner surface of the concrete layer of the segment so as not to peel off, and the entire inner peripheral surface of the pipeline is covered with the synthetic resin sheet, and the connecting portion of the segment is also synthesized with the adjacent segment. Since the resin sheets are joined by the synthetic resin strip, the fluid is prevented from entering the concrete layer not only from the inner surface but also from the connection portion. In addition, since the synthetic resin strip is interposed in the gap between the concrete layer and the synthetic resin sheet, the connected synthetic resin sheets of adjacent segments are flush with each other.

〔Example〕

 Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially cutaway perspective view of a segment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. 1, and FIG. FIG. 5 is an enlarged sectional view taken along the line VV of FIG. 4, and FIG. 6 is an enlarged sectional view taken along the line VI-VI of FIG.

In the method for constructing a corrosion-resistant pipe according to the present invention, first, a large number of segments 1 are manufactured. Segment 1 is shown in FIGS.
As shown in the figure, a synthetic resin sheet 3 having a large number of anchors 4 is affixed to the inner surface of a concrete layer 2 and has a circular arc shape when a plurality of them are connected in the circumferential direction. The synthetic resin sheet 3 is a semi-rigid vinyl chloride resin,
It is made of a thermoplastic resin such as polyethylene or polypropylene, and has a large number of anchors 4 integrally protruding therefrom. In addition,
The anchor 4 is for preventing the synthetic resin sheet 3 from peeling off from the inner surface of the concrete layer 2, and it is preferable to form rib-like projections continuous in the circumferential direction or the axial direction at predetermined intervals as shown in the figure. The synthetic resin sheet 3 is placed on an arc-shaped form in a detachable state, concrete is poured on the upper surface thereof, and the concrete is further compressed by the arc-shaped form.
After the concrete is hardened by, for example, applying vibration, the concrete is released and the segment 1 is manufactured. Then, since the synthetic resin sheet 3 is attached to the inner surface of the concrete layer 2, the inner surface of the concrete layer 2 is covered with the synthetic resin sheet 3. In addition, anchor 4 is concrete layer 2
And the synthetic resin sheet 3 does not peel off from the concrete layer 2. The segment 1 is illustrated as an arc-shaped one that becomes a right cylinder when three are connected in the circumferential direction. A large number of such segments 1 are formed in advance in a factory, and they are carried into an underground tunnel, where the segments 1 are sequentially connected in the circumferential direction and the axial direction as shown in FIG. In this way, a pipeline having excellent acid resistance and chemical resistance is constructed. In each of the drawings, a groove 5 is formed at one end in the circumferential direction and the axial direction of the segment 1, and the groove 5 is formed at the other end.
A protrusion 6 is provided so as to fit into the groove, and the protrusion 6 of the other segment 1 is fitted to and connected to the concave groove 5 of one segment 1.

In addition, as described above, the segments 1 are connected in the circumferential direction and the axial direction, and at each connection portion of the segments 1, as shown in FIGS. 5 and 6, the concrete layer 2 and the synthetic resin sheet 3 are connected. A synthetic resin strip 8 is interposed in a gap 7 previously formed therebetween. The gap 7 has the thickness of the synthetic resin band 8 and is approximately the same size as the width of the synthetic resin band 8 when the segments 1 are connected, and is formed when the segment 1 is manufactured. The synthetic resin strip 8 is a synthetic resin sheet 3
The same material as that described above is preferable, and an example in which a projection 9 is provided so that no gap is formed at the edge of the synthetic resin sheet 3 of the connected segment 1 is illustrated. The synthetic resin strip 8 is interposed in the gap 7, and the synthetic resin sheet 3 of the adjacent segment 1 is provided.
To fit. Synthetic resin strip 8 and synthetic resin sheet 3
Bonding may be performed using an adhesive or welding. By connecting the synthetic resin sheet 3 and the synthetic resin band 8 at each connection portion of the segment 1 in this manner, each connection portion becomes water-tight and prevents a fluid such as a chemical from entering the concrete layer 2. Moreover, the connected synthetic resin sheets 3 of the adjacent segments 1 are flush with each other,
No irregularities are formed.

〔The invention's effect〕

As described above, according to the present invention, a large number of segments can be superimposed, and since they are not bulky, they are convenient for storage, transportation, and the like. A cylindrical pipe can be easily constructed simply by connecting. Since the entire inner peripheral surface of the conduit is covered with a synthetic resin sheet that does not peel off, a fluid such as a chemical does not enter the concrete layer from the inner peripheral surface. In addition, since the synthetic resin sheets of the adjacent segments are also joined by the synthetic resin band at the connecting portion of the segments, there is no intrusion of fluid from that portion, and corrosion of the concrete layer due to infiltration of fluid can be prevented. . In addition, since the synthetic resin sheet of the connection portion is flush with the surface and no irregularities are formed, the fluid flows smoothly in the pipeline, and has many effects as a method of constructing the corrosion-resistant pipeline.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, and FIG.
FIG. 2 is a sectional view taken along the line II-II of FIG. 1;
FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, FIG. 4 is a perspective view of a state where the segments are connected, and FIG.
FIG. 6 is an enlarged sectional view taken along the line VI-VI of FIG. 4. In the figure, 1 is a segment, 2 is a concrete layer, 3 is a synthetic resin sheet, 4 is an anchor, 7 is a gap, and 8 is a synthetic resin strip.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 59-147799 (JP, U) Japanese Utility Model Hei 1-79680 (JP, U) Japanese Utility Model Utility Model Sho 61-1884749 (JP, U) Japanese Utility Model Utility Model 1 167492 (JP, U)

Claims (1)

(57) [Claims] 1. An arc-shaped segment having a plurality of anchors attached to an inner surface of a concrete outer layer and having a cylindrical shape when a plurality of the segments are connected in a circumferential direction, and the segment is formed around the segment. Direction and in the axial direction, and at each connection portion of the segment, a synthetic resin strip is interposed in a gap previously formed between the concrete layer and the synthetic resin sheet to straddle the synthetic resin sheet of the adjacent segment. A method of constructing a corrosion-resistant pipeline characterized by joining together.