JP2700405B2 - Internal lining structure of existing pipeline - Google Patents

Description

The present invention relates to an inner lining structure of an existing pipeline.

[Conventional technology]

Pipelines through which corrosive components such as hydrogen sulfide contained in wastewater from leather factories flow are susceptible to aging due to wall corrosion, and are aging in general concrete pipes, including such pipes. Cracks may occur as the process proceeds. Therefore, as a measure for extending the service life of the pipeline in use, that is, the existing pipeline, a method of using the internal passage of the lining layer formed on the road wall of the existing pipeline as a new passage has been attempted.

Conventionally, when a lining layer joined to the road wall is formed by lining glass fiber reinforced polyester resin (FRP) on the road wall of the existing pipeline or inserting an FRP tube, the area around the existing pipeline is Water penetrates from the soil through the road wall between the road wall and the lining layer, and the lining layer receives water pressure corresponding to the burial depth of the existing pipeline, and separates from the road wall or expands into the new passage. In some cases, the lining layer was broken or deformed into a wavy shape, and in some cases, the lining layer was broken by the water pressure. Such a situation tends to occur more remarkably when a synthetic resin having a lower strength than FRP is used as the lining layer. In order to eliminate this, if a slight gap is provided without joining the lining layer to the road wall, problems such as peeling will not occur, but the lining layer will receive water pressure directly, and the thickness will be increased accordingly. And new problems such as cost and workability arise.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances, and has been joined to a road wall of an existing pipeline by collecting and effectively discharging water that has entered the road wall of the existing pipeline. An object of the present invention is to provide an inner lining structure of an existing pipeline in which the influence of the water pressure hardly reaches the lining layer.

[Means for solving the problem]

The inner lining structure of the existing pipeline described in claim 1 is characterized in that a main water channel extending in the longitudinal direction at the bottom of the existing pipeline is provided on the road wall of the existing pipeline joined and lined with the lining layer. A plurality of branch water channels are provided that communicate with the water channel and extend in the circumferential direction of the existing pipeline.

The inner lining structure of the existing pipeline according to claim 2, wherein the branch water channel is provided at a location other than the upper portion of the existing pipeline, and the lining is provided above the existing pipeline where the branch water channel is not provided. A non-joining portion where the layer and the existing pipeline are not joined is formed in a linear shape, and the non-joining portion communicates with the branch water passage.

(Operation)

According to the first and second aspects of the present invention, water that has entered through the road wall is collected in the main water channel through the plurality of branch water channels, and is discharged through the main water channel. Claim 2
According to the invention, water that has entered the upper part of the road wall where the branch water channel is not provided is guided to the branch water channel through a non-joining portion between the lining layer and the road wall.

〔Example〕

FIG. 1 shows a pipeline adopting an inner lining structure according to an embodiment of the present invention. 1 and 2 are meeting places, and the meeting place 1 on the upstream side is located slightly higher than the meeting place 2 on the downstream side. A road wall 3 is constructed between these meeting places 1 and 2 by casting concrete, and a pipe surrounded by the road wall 3 is an original pipe, that is, an existing pipe.
The concrete cast in the field in this way becomes solid after being solidified, and water easily penetrates from the road wall 3 of the existing pipeline, and particularly requires lining. Of course, a concrete pipe may be buried in the soil to form an existing pipe. A lining layer 4 is joined to the road wall 3 over the entire circumference and the entire length thereof. The lining layer 4 is provided in order to form a new pipeline inside the existing pipeline, and the wall surface of the road wall 3 has irregularities or steps due to corrosion or erosion, or cracks due to aging. The present invention is not limited to this case, and may be a new road wall 3 or may be provided in a case where a different kind of waste liquid is caused to flow through a pipeline. In the lining layer 4,
Synthetic resins such as FRP and polyvinyl chloride resin, resin concrete and polymer cement are used. The method for forming the lining layer 4 is not particularly limited. That is, when the FRP is used, even if the lining layer 4 is formed by applying the polyester resin and the glass fiber to the road wall 3 while alternately laminating, the flaky glass piece and the polyester resin are mixed to form the road wall 3. The lining device 4 may be formed by applying the varnish and curing the lining material 4 or an uncured tube produced by FRP may be inserted into an existing pipeline and cured to form the lining layer 4. When a polyvinyl chloride resin is used, a tube slightly smaller than the existing pipeline is inserted and adhered to the road wall 3 to form the lining layer 4, or a thin sheet is formed along the road wall 3,
The lining layer 4 can be formed by bonding with an epoxy resin or the like. Further, when a synthetic resin pipe or concrete pipe is used, they are inserted into an existing pipeline to form a lining layer 4, and a filler such as cement milk is poured between the road wall 3 and the lining layer 4.

On the road wall 3 joined and lined with the lining layer 4, a main water groove 5 extending in the longitudinal direction of the existing pipe at the bottom of the road wall 3, and communicating with the main water groove 5, A plurality of branch water passage grooves 6 extending in the circumferential direction are provided.
The main water channel 5 extends over the entire length of the road wall 3, and the end facing the meeting place 2 on the downstream side communicates with a vertical groove 7 formed on the peripheral wall of the meeting place 2. Then, a valve body 9 made of a flexible material such as a rubber sheet is fixed to the peripheral wall of the meeting place 2 with an anchor 10, and the vertical groove 7 is covered by the valve body 9 as shown in FIG. The branch water passages 6 are provided at equal intervals or substantially at equal intervals except for the upper part of the road wall 3.

The lining layer 4 is joined to the road wall 3 except for a non-joining portion 11 described later. Here, the term “joining” means, of course, the case where the road wall 3 and the lining layer 4 are adhered to each other.
This refers to a state in which water that has penetrated through the road wall 3 does not flow smoothly between the road wall 3 and the lining layer 4 by, for example, pressing a filler between the road wall 3 and the lining layer 4. As the adhesive, moisture-curable urethane or epoxy resin is used, and the lining layer 4 is adhered and fixed to the road wall 3 by applying it to the road wall 3 or applying it to the FRP tube. There is an advantage that the thickness of the lining layer 4 can be reduced by bonding. In the illustrated example, the non-joining portion 11 is formed in a lattice shape on the upper part of the road wall 3 where the branch water channel 6 is not provided, and as shown by a dashed line in FIG. A point 11 is connected to each of the branch water channels 6. Here, it is preferable that the non-joining portion 11 is such that a gap 12 as shown in FIG. 3 is positively formed between the lining layer 4 and the road wall 3. For example, when the lining layer 4 is formed by FRP, The non-joining portion 11 is formed, for example, by applying wax as a release agent to a portion indicated by a dashed line in FIG. 1, and forming the lining layer 4 thereon. Further, it is formed as shown in FIG. 4 and FIG. In addition, as shown in FIGS. 4 and 7, a frame 13 is provided on the upper part of the road wall 3 where the branch water channel 6 is not formed.
Is also formed by forming protrusions in a lattice shape by disposing a lining layer 4 thereon. In addition, if the non-joined portion 11 is left in a non-adhered state without actively forming the gap 12, water leaks down the non-adhered portion by itself. The shape does not necessarily have to be a lattice.

According to the above configuration, the lining layer 4 passes through the road wall 3.
Water that has entered the back of the road at the upper part of the road wall 3
At the middle and lower portions of the road wall 3 and at the branch water channel 6 and the main water channel 5. 12 and the water flowing down the branch water channel 6 and merges at the main water channel 5 to form the main water channel 5
And through the flute 7 to the meeting place 2 on the downstream side. When the water that has entered the back surface of the lining layer 4 is discharged to the downstream meeting place 2 without stagnation, the underground water pressure is hardly applied to the lining layer 4 and the lining layer 4 is separated from the road wall 3 or the like. A situation such as bulging into the new passage 13 or deforming into a wavy shape is prevented beforehand. Therefore, the thickness of the lining layer 4 can be reduced, for example, about 2 plies in the case of FRP. When water flows down from the main water channel 5 through the vertical groove 7, the valve element 9 is elastically deformed by the water pressure at that time as shown in FIG. When the valve body 9 is immersed in the waste liquid or water accumulated in the meeting place 2 when water does not flow down from the vertical groove 7 or when the valve body 9 is immersed in the water, As shown in FIG. 1, the vertical groove 7 is hermetically sealed by the restoring force. Therefore, the valve body 9 functions as a backflow prevention valve to prevent the backflow phenomenon in which the corrosive gas (such as hydrogen sulfide) staying in the existing pipeline or the waste liquid or water in the meeting place 2 flows into the main waterway 5. Thus, corrosion of the road wall 3 and peeling, swelling and deformation of the lining layer 4 due to the backflow are prevented. Therefore, as shown in FIG. 1, the starting end of the main water channel 5 is sealed inside the meeting place 1 on the upstream side to prevent waste liquid and water flowing into the meeting place 1 from entering the main water groove 5. Even if only the water that has entered through the road wall 3 flows through the main water channel 5, no inconvenience occurs. If a mud pool or the like is present at the lower part of the meeting place 2 and water is always present, the side of the vertical groove 7 may be covered with FRP or the like, and the lower part of the vertical groove 7 may be opened and sealed with water.

FIGS. 5 and 6 show examples of the cross-sectional shape of the girder 16 constituting the frame 13. The girder 16 in FIG. 5 has a wide recess 17 on the back surface. The spar member 16 has a plurality of recesses 18 formed with a wavy back surface. When these girder members 16 are used, the recesses 17 and 18 serve as water passages, so that the water collecting ability of the non-joined portions 11 is improved in combination with the action of the gap 12, and water that has entered the back surface of the lining layer 4 is There is an advantage that the water is guided to the branch water channel 6 very quickly.

In the above description, the branch water passage groove 6 is provided at a location other than the upper part of the road wall 3, but the branch water passage groove 6 may be provided on the entire circumference including the upper part of the road wall 3, and in such a case, The non-joining portion 11 may or may not be provided. When the diameter of the existing pipeline surrounded by the road wall 3 is large, the branch water channel 6 is provided at a location other than the upper part of the road wall 3 as described above, and the branch water channel 6 is not provided. It is desirable to form a non-joining portion 11 where the lining layer 4 and the road wall 3 are not joined at the upper part of the road wall 3. For example, in a large-diameter existing pipeline having a diameter of 1.5 m or more, the branch water flow groove 6 is formed in a range where the elevation angle θ shown in FIG. If the portion 11 is formed, it is not necessary to groov the upper part of the road wall 3 where it is difficult for the worker to groov the road wall 3, and the workability is improved.
Further, a sufficient number of non-joined portions 11 can be easily formed on the upper portion of the road wall 3 where water is most likely to enter. In the case where FRP is used for the lining layer 4 for joining and lining the road wall 3 of the existing large-diameter pipe, for example, a moisture-curable urethane primer as an adhesive is applied to the road wall 3 and then applied. It is preferable to overlay a glass fiber layer and a polyester resin layer on each of two layers, and further to overlay a surface glass fiber and a polyester resin on the surface thereof to finish the surface. By doing so, the so-called two-ply FRP layer is finished with a surface surface mat, and the inner surface of the newly established passage is finished smoothly.
In joining and lining the FRP lining layer 4, a tape 20 is applied on the main water channel 5 as shown in FIG. 8 and the lining layer 4 is formed thereon. Can be prevented from hanging down into the main water channel 5. Also, as shown in the illustrated example, the lining layer 4
It is also possible to prevent sag by making the portion corresponding to the main water channel 5 thicker than other portions. It is advantageous to employ the same means for the branch water channel 6. The main water channel and the branch water channel corresponding to the main water channel 5 and the branch water channel 6 are formed by using a girder material as shown in FIGS. Although it is possible to omit the work, in this case, since the main waterway and the branch waterway swell in the lower part and the inner part of the intermediate part of the road wall 3, the roughness coefficient decreases and solid matter is caught. There is a possibility that a water channel with a groove type as shown in the above drawing is preferable. The waste liquid hardly flows in the upper part of the road wall 3, and the frame 13 made of the girder material does not cause any trouble.

Road wall 3 of existing pipeline through which leather waste liquid of 1.65m diameter flows
The main water channel 5 with a groove width of 50 mm and a depth of 30 mm, the branch water channel 6 with a groove width of 20 mm, a depth of 10 mm and a pitch of 3 m between each other, and the girder member 16 with a width of 50 mm are formed into a 1 m square grid. After the assembled frame 13 is provided as shown in FIG. 4, a moisture-curable urethane primer is applied to the road wall 3, and the lining layer 4 having a 2-ply FRP layer surface-finished with a surface mat is bonded and lined. The lining layer 4 is fixed with a stainless steel anchor 21 (see FIG. 2) every 60 degrees in the circumferential direction and every 1 m in the longitudinal direction, and the head of the anchor 21 is sealed with FRP for a certain period. When the degree of swelling and deformation of the lining layer 4 and the degree of separation from the road wall 3 were examined later, almost no swelling, deformation and separation of the lining layer 4 were recognized.

〔The invention's effect〕

As described above, according to the present invention, water that enters through the road wall of the existing pipeline to which the lining layer 4 is joined and lined is collected in the main water channel and discharged, and the effect of the water pressure of the intruded water is reduced. Difficult to spread over layers. Therefore, FRP
The lining layer constructed by joining lining or other synthetic resin to the road wall is likely to peel off from the road wall due to water pressure, bulge in the new passage, deform into a wavy shape, or break Is prevented and the lining layer can be made thinner.

In particular, according to the second aspect of the present invention, there is no need to provide a branch water channel in the upper part of the road wall of an existing pipeline in which it is difficult to perform a groove cutting operation, so that the lining workability is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is II in FIG.
FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 1, FIG. 4 is a sectional view showing a state where a framework is disposed above the road wall, and FIG. FIG. 6 is an enlarged sectional view taken along line VV of FIG. 4, FIG. 6 is a sectional view showing a modification of FIG. 4, and FIG.
FIG. 8 is an enlarged sectional view taken along the line VII-VII of FIG. 4, FIG. 8 is an enlarged sectional view taken along the line VIII-VIII of FIG. 1, FIG. The figure is a view taken in the direction of the arrow X in FIG. 3 ... road wall, 4 ... lining layer, 5 ... main water channel, 6
… Branch water channel, 11… Non-joined part.

Claims (2)

(57) [Claims] 1. A main water channel extending in a longitudinal direction of an existing pipeline at a bottom portion of the existing pipeline, a main water channel extending in a longitudinal direction of the existing pipeline at a bottom wall of the existing pipeline, the communication being performed with the main water channel. An inner lining structure of an existing pipeline, wherein a plurality of branch water channels extending in a circumferential direction of the pipeline are provided. 2. The lining layer and the road wall are joined to the upper part of the road wall where the branch water passage groove is provided except for the upper part of the road wall. An inner lining structure of an existing pipeline, wherein a non-joined portion that is not formed is formed in a linear shape, and the non-joined portion is connected to the branch water channel.