JP6644344B1 - How to update the pipeline - Google Patents

Abstract

An object of the present invention is to replace an existing pipeline which is exposed and laid on the ground so that a new pipeline can be constructed in a short period of time. A pipeline updating method for updating an existing pipeline for water passage exposed and laid on the ground with a new pipeline, wherein a pipe piece (40) is provided in an iron pipeline (10) of the existing pipeline. Are formed, and connection openings 33 to 35 for exposing the joints of the tube pieces 40 to the outside are formed. The tube piece 40 is inserted from the insertion openings 31 and 32 and moved to the installation position. The ends of the adjacent pipe pieces 40 are connected, and after the connection, the insertion openings 31 and 32 and the connection openings 33 to 35 are closed by a closing member, so that the space between the pipe piece 40 and the existing pipeline is closed. Is solidified into the gap. [Selection diagram] FIG.

Description

  The present invention relates to a method for updating a pipeline that constructs a new pipeline while utilizing an existing pipeline, such as a penstock for hydroelectric power generation, etc. It is.

  As an example of piping laid to be exposed on the ground, there is a penstock used for hydroelectric power generation. A penstock is a pipeline for supplying water from a water source to a power plant having a generator. Hydropower generation can be classified by reservoir type, reservoir type, and run-of-river type. The storage type is a method in which river water is stored in a large reservoir in the early spring or early autumn, when the amount of water is abundant and the power consumption is relatively low, and it is used to generate electricity in summer or winter when power is consumed a lot. . The regulating pond type is a method in which river water is stored in a pond, refraining from power generation at night or on weekends when power consumption is low, and power is adjusted while the amount of water consumption increases. The run-of-river type is a method that uses water for power generation without storing the water flowing in the river.

  Hydropower generation is classified into dam type, water channel type and dam channel type in terms of structure. In the dam type, a dam is used to block a river to create a reservoir, and power is generated using the head of a power plant directly below the dam. The canal system is a system in which water is introduced into a regulating pond created by a low weir upstream of the river, and water is guided to a point where a head can be obtained by a long canal to generate electricity. The dam canal system is a power generation system that combines the dam system and the canal system.

  In each power generation system, a pipeline such as a penstock or a headrace is used to supply water from a water source, such as a regulating pond, to a power generation device of a power plant.

  Patent Literature 1 discloses a hydroelectric power generator in which a bag-shaped dam is inflated to block a river, and the blocked water is supplied to the power generator via a water conduit. Patent Document 2 discloses a headrace for hydroelectric power generation in mountainous areas, and describes a dam type, a canal type, and a hydroelectric power generation system with respect to a dam canal type.

Japanese Patent No. 5092056 Japanese Patent No. 4647032

  Pipelines such as headraces and penstocks used for hydroelectric power generation are iron pipes, and replacement or renewal work is performed according to their useful lives. Conventional renewal work is performed by removing an existing pipeline and laying a new pipeline. Therefore, in order to lay a new pipeline, first remove the existing pipeline laid on the concrete structure such as a fixed base or small abutment, and demolish a substantial part of the concrete structure as necessary . Next, while constructing a similar concrete structure, a new pipeline is being laid.

  Since the pipeline for hydroelectric power generation is laid on steep slopes, renewal work requires a lot of work using a cableway such as a cable crane. For this reason, the frequency with which the suspended load passes above the work place increases, so that the process control for avoiding the vertical operation becomes strict, and as a result, the laying period needs to be lengthened. In addition, since heavy objects are transported, the cableway equipment becomes large-scale. Furthermore, as a safety measure, it is necessary to install large-scale temporary facilities to prevent concrete from falling and falling when demolishing and removing concrete structures, measures to prevent falls from falling on high places and slopes, dust measures, noise measures, etc. In the renewal work, not only takes a long time for the construction work, but also raises construction costs.

  Such problems in the replacement and renewal of pipelines are the same not only in pipelines such as penstocks for hydraulic power generation and headraces, but also in various pipelines that are exposed and laid on the ground.

  The present invention has been made in view of the above technical background, and has an object to replace an existing pipeline laid exposed on the ground and to construct a new pipeline in a short time. And

  In order to solve the above-mentioned problem, a method for updating a pipeline according to the present invention according to claim 1 is a method for updating a pipeline for updating an existing pipeline for water passage exposed and laid on the ground to a new pipeline. A method, an insertion opening for inserting a tube piece, and a connection opening for exposing a joint between the tube pieces to the outside, an opening forming step of forming an existing pipeline to be updated, A pipe piece installation step of inserting the pipe piece from the insertion opening and moving the pipe piece to an installation position of the existing pipeline, and connecting the end of the pipe piece adjacent in the existing pipeline with the connection. A connecting step of connecting via an opening for closing, a closing step of closing the opening for insertion and the opening for connection with a closing member having a shape corresponding to the opening for insertion and the opening for connection, Inject solidification material into the gap between the pipe piece and the existing pipeline It characterized by having a a input step.

  According to a second aspect of the present invention, in the method for updating a pipeline according to the first aspect, the existing pipeline is an iron pipeline that is laid on a slope and supplies water at a water source to a power generation device of a power plant. In the pipe piece installation step, the pipe piece inserted from the insertion opening is moved toward the lower side of the existing pipeline and installed.

  A method for updating a pipeline according to claim 3 is provided. The invention according to claim 1 or 2, wherein the insertion opening and the connection opening are formed by a cutting and removing portion obtained by cutting an upper portion of the existing pipeline having a semicircular cross-section. In the closing step, the cutting / removing section is returned to the insertion opening and the connecting opening as a closing member to restore the existing pipeline.

  According to a fourth aspect of the present invention, in the method for updating a pipeline according to the third aspect, an arc-shaped reinforcing member is fixed to an outer peripheral surface of the cutting and removing portion before cutting the cutting and removing portion. Features.

  According to a fifth aspect of the present invention, in the pipe updating method according to any one of the first to fourth aspects, the insertion opening is longer than an axial length of the pipe piece, and the connection opening is provided. The portion is shorter in axial length than the insertion opening.

  According to a sixth aspect of the present invention, in the method for updating a pipe according to any one of the first to fifth aspects, the insertion opening also serves as the connection opening.

  According to a seventh aspect of the present invention, in the method for updating a pipeline according to any one of the first to sixth aspects, the existing pipeline has a bent portion in a path, and the insertion is performed in the bent portion. The opening is provided.

  In the pipe updating method according to claim 8, in the invention according to any one of claims 1 to 7, a roughness coefficient of the pipe piece is lower than a roughness coefficient of the existing pipe. It is characterized by the following.

  The pipe updating method according to claim 9 is the invention according to any one of claims 1 to 8, wherein the existing pipe is made of iron, and the pipe piece is made of resin. I do.

  Since the replacement of the existing pipeline is performed by inserting the pipe piece inside the existing pipeline using the existing pipeline as it is, a new pipeline can be constructed in a short time at low cost. . Since the renewal of the pipeline does not require substantial demolition and removal work of the reinforced concrete structure, the renewal work can be performed safely.

  In addition, since the material to be removed is small and light, the safety is improved by reducing the frequency of transportation, and the cableway equipment can be reduced in size.

  When the existing pipeline is an iron pipeline for hydroelectric power generation, the pipeline is laid on a slope, and when moving the pipe piece from the insertion opening to the installation position, use the weight of the pipe piece. Can be moved.

  The opening for insertion and the opening for connection are formed by cutting the existing pipeline, and the cut and removed portion is reused to close each opening as a closing member, so that the cut and removed portion can be effectively used. Can be. When the reinforcing member is fixed to the outer peripheral surface of the cutting and removing portion, the deformation of the cutting and removing portion can be prevented, and it is possible to easily attach the cutting and removing portion to the existing pipeline.

  In the case where a bent portion is provided in the path of the existing pipeline, if the insertion opening is provided in the bent portion, the installation of the bent type pipe piece can be easily performed.

  If the pipe piece is made of resin, the frictional resistance of water flowing inside is small, so that even if the inner diameter of the pipe piece is smaller than the inner diameter of the existing pipeline, a sufficient water flow can be secured. Further, since the newly installed pipeline is a double pipe in which the existing pipeline is used as the sheath pipe and the pipe piece is incorporated therein, the durability of the newly established pipeline can be improved.

It is the schematic which shows the hydroelectric power generation system of a regulating pond type. It is sectional drawing which shows an example of the iron pipeline as an existing pipeline laid between the regulating pond and the power plant. FIG. 3 is an enlarged sectional view showing a part of FIG. 2. It is sectional drawing which shows the state which formed the several opening part in the existing pipeline. It is sectional drawing which shows the state in which three pipe pieces were installed in the existing pipeline. It is sectional drawing which shows the state which the opening for insertion was closed by the closing member after connecting the adjacent pipe piece in the existing piping. It is sectional drawing which shows the state which is inject | poured into the clearance gap between a pipe piece and an existing pipeline. It is sectional drawing which shows the state which connected another pipe piece to the pipe piece arrange | positioned in the existing pipeline. It is a perspective view which shows an example of the cutting removal part which can be reused as a closing member. (A) is a front view which shows the modification of a cutting removal part, (B) is sectional drawing of 10B-10B line in (A), (C) is sectional drawing of 10C-10C line in (A). It is. It is a perspective view showing two pipe pieces. (A) is a perspective view which shows the state which joined two pipe pieces, (B) is a cross-sectional view of (A). (A)-(C) is sectional drawing which shows the state in which the receiving part and insertion part of two pipe pieces are thermally welded. (A) is sectional drawing which shows the junction part of a tube piece, (B) is an expanded sectional view of 14B-14B line in (A). (A) is a half sectional view showing a modification of the tube piece, and (B) is a half sectional view showing another modification of the tube piece. (A) is a half sectional view showing an example of a bent type pipe piece, and (B) is a half sectional view showing a modified example of a bent type pipe piece.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in a regulating pond type hydroelectric power generation system, river water is stored in a regulating pond 2 formed by a weir body 1. The water in the regulating pond 2 is supplied to the power plant 4 by the water channel 3, the power is generated by the generator in the power plant, and the water after the power generation is discharged to the river by the water discharge channel 5.

  FIG. 2 is a cross-sectional view illustrating an example of an iron pipeline 10 as an existing pipeline laid between the regulating pond 2 and the power plant 4. The iron pipe 10 is an iron pipe for water passage laid on a slope 6 between the regulating pond 2 and the power plant 4. Water on the water source side in the regulating pond 2 is supplied to the power plant by the iron pipe 10. No. 4 power generator. The iron pipeline 10 is laid so as to be exposed on the ground, and has four straight regions 11 to 14 from the power plant 4 toward the regulating pond 2, that is, from the downstream side to the upstream side. The connecting portions of the regions are bent portions 15 to 17. The bent portions 15 and 17 are mountain-bent bent portions protruding upward, and the bent portion 16 is a valley-bent bent portion retracted downward.

  As described above, since the iron pipeline 10 shown in FIG. 2 is laid along the vertical shape of the ground surface, a plurality of bent portions 15 to 17 are provided in the water passage between the regulating pond 2 and the power plant 4. have. However, for example, in the case of a reservoir-type hydroelectric power generation system, the entire structure may be straight without a bent portion, and in such a case, the updating method of the present invention can be applied.

  The iron pipeline 10 is supported on the sloping ground 6 by a plurality of fixing stands 21 to 24 and is exposed on the ground surface. In FIG. 2, four fixed bases 21 to 24 are laid on the slope 6. A plurality of small abutments 25 smaller than the fixed bases are laid on the slope 6 between the fixed bases 21 to 24, and the small abutments 25 support the straight regions 11 to 14, respectively. . The fixed bases 21 to 24 and the small abutment 25 are each made of reinforced concrete, and the bent portions 15 to 17 are supported by the fixed bases 21 to 23.

  When the service life of the iron pipe 10 has passed and the steel pipe 10 has become obsolete, it is necessary to perform a replacement work of the iron pipe 10, that is, an update work. In this embodiment, in this case, a new pipeline is constructed by reusing the existing pipeline, which is the existing pipeline, without removing it.

  FIGS. 3 to 8 show a method of updating a pipeline that constructs a new pipeline by using an existing pipeline. Each of the methods is a straight area 11, 12 of the iron pipeline 10 shown in FIG. 2 shows a part of a region 13.

  In FIG. 3, the positions of the two insertion openings 31 and 32 and the three connection openings 33 to 35 are indicated by two-dot chain lines. The insertion opening 31 includes the bent portion 15 of the iron pipeline 10, and the insertion opening 32 includes the bent portion 16 of the iron pipeline 10. The axial lengths of the insertion openings 31 and 32 are set longer than the axial lengths of the connection openings 33 to 35. That is, the connection openings 33 to 35 are shorter than the insertion openings 31 and 32.

  Each of the openings 31 to 35 corresponds to an upper portion in the radial direction of the iron pipeline 10. When the openings 31 to 35 are removed from the iron pipeline 10 as cutting and removing portions, as shown by solid lines in FIG. 4. In addition, openings 31 to 35 are formed in the iron pipeline 10.

  A pipe piece (to be described in detail later) is inserted into the iron pipe 10 which is an existing pipe from the insertion openings 31 and 32 from which the cutting and removing portions have been removed, and the pipe piece is connected to the connection opening 33. At -35 they are joined together at the ends. As a result, a new pipeline composed of pipe pieces is laid inside the iron pipeline 10, which is an existing pipeline. The pipe pieces can also be joined at the insertion openings 31 and 32. Further, although the insertion openings 31 and 32 are provided in the bent portion, the insertion openings may be provided in the straight portion.

  FIG. 9 is a perspective view showing the cutting and removing portion 33a formed by being removed from the connection opening 33. The connection opening 33 is formed in the iron pipeline 10 by removing the cut and removed portion 33 a having this shape from the iron pipeline 10. The cutting and removing portion 33a is a semicircular arc-shaped portion on the upper side of the iron pipe line 10, and is cut out and taken out of the iron pipe line 10 by, for example, irradiating gas to the iron pipe line 10 from a cutting torch of a gas cutting machine. . By forming the other connection openings 34 and 35 in the iron pipe 10, cut-off portions 34 a and 35 a corresponding to the shapes of the respective connection openings 34 and 35 are cut out from the iron pipe 10. Similarly, by removing a portion having a shape corresponding to the insertion openings 31 and 32 from the iron pipeline 10, the cut and removed portions 31 a and 32 a having a bent portion are formed.

  As shown in FIG. 9, the outer peripheral surface of the cut / removed portion 33 a in order to reuse the cut / removed portion 33 a which has been cut and removed from the iron pipe line 10 and use it as a closing member for closing the connection opening 33. Before cutting, a plurality of reinforcing members 36 are welded in advance. The reinforcing member 36 is formed by processing an iron plate into an arc shape, extends in the circumferential direction along the outer peripheral surface of the cut-off portion 33a, and projects radially outward. Further, both end portions of the reinforcing member 36 are projecting end portions 37 protruding outward from the axial opening surface of the cutting and removing portion 33a, and the end surface 38 of the cutting and removing portion 33a is substantially in the longitudinal direction. It is a right angle.

  As shown in FIG. 9, when the reinforcing member 36 is attached to the outer peripheral surface of the cutting and removing section 33 a, it is possible to prevent the cutting and removing section 33 a from being thermally deformed or elastically deformed when being removed from the opening 33. Further, when the protruding ends 37 protruding from the opening surface are provided at both ends of the reinforcing member 36, when the cut-removed portion 33a is attached to the connection opening 33, the width of the cut-removed portion 33a with respect to the iron pipe line 10 is reduced. Positioning can be easily performed.

  FIG. 9 shows the cutting and removing portion 33 a formed by removing the connection opening 33, but formed by removing the other connection openings 34 and 35 and the insertion openings 31 and 32. Regarding the cut and removed portions 31a, 32a, 34a, and 35a to be cut, a reinforcing member may be similarly attached to the outer peripheral surface.

  FIG. 10 shows a modification of the cutting and removing unit 33a. Both end surfaces 38 of the cut and removed portion 33a are inclined surfaces, and each inclined surface is inclined inward in the axial direction from the central portion in the width direction toward the opening surface in the axial direction. Further, the opening surface is provided with a tapered projection 39a whose width decreases toward the tip. In this manner, by inclining both end surfaces 38 in the axial direction, the cut and removed portion 33a can be easily positioned and attached to the connection opening 33. Similarly, the cutting and removing portions formed by removing the other connecting openings 34 and 35 and the inserting openings 31 and 32 may have both end surfaces having inclined surfaces.

  As the closing member, it is possible to newly form a member having a semicircular cross-section without reusing the cutting and removing part, but by reusing the cutting and removing part, effective use of resources can be achieved. And the pipeline can be updated in a small number of steps.

  FIG. 5 is a cross-sectional view showing a state in which three pipe pieces 40 are installed in the iron pipe line 10. The tube piece 40 is set to a dimension shorter than the length of the insertion openings 31 and 32. The most downstream pipe piece 40a is inserted through the insertion opening 31, and is moved to a predetermined installation position on the downstream side of the iron pipe line 10. Next, the tube piece 40b is inserted from the insertion opening 31, moved downstream, and abuts against the upper end of the tube piece 40a. Next, the pipe piece 40c is inserted from the insertion opening 32, moved to the downstream side, that is, the lower side in the iron pipe line 10, and hits the pipe piece 40b. FIG. 5 shows a state in which the pipe piece 40d connected to the pipe piece 40c is being conveyed by the cable crane 41.

  In these drawings, the pipe pieces are indicated by reference numeral 40, and the pipe pieces 40 at specific positions are denoted by reference signs a to g.

  The cable crane 41 as a cableway includes a guide cable 42 attached to a tower (not shown), and a hanging hook 43 that is guided and moved by the guide cable 42, and the pipe piece 40d is moved by the hanging hook 43. It is inserted into the insertion opening 32. The inserted pipe piece 40d is moved to the downstream side in the iron pipe line 10 and hits the upper end of the pipe piece 40c described above.

  Since the pipe piece 40 is inserted into the iron pipe line 10 laid on the inclined surface and moved downstream, the pipe piece 40 can be moved by utilizing its own weight. However, when moving a portion having a large inclination angle, it is necessary to gradually move the pipe piece 40 in a state of being pulled by a wire or the like in order to reduce an impact when the pipe piece 40 is previously inserted. Yes, for example, an electric winch may be installed at the upper part in the axial direction of the pipe piece 40 and moved downward while being pulled.

  FIG. 11 is a perspective view showing two straight tube pieces 40. The pipe piece 40 is a high-pressure polyethylene pipe called a Howell pipe (registered trademark) mainly made of high-density polyethylene which is a thermoplastic resin, and has a roughness coefficient which is an index indicating an amount of resistance when flowing water touches an inner wall. Is lower than the existing iron pipeline 10, and despite the smaller diameter than the iron pipeline 10, the same flow of water as before can flow. A receiving portion 51 having a larger diameter than the distal end portion is provided at a proximal end portion of the tube piece 40. The inner diameter of the receiving portion 51 is smaller than the outer diameter of the distal end portion in order to improve the degree of adhesion of the joint portion, and the insertion portion 52 as the distal end portion of the other tubular piece 40 is provided inside the receiving portion 51. Inserted. A heating element 53 is annularly incorporated in the inner peripheral surface of the receiving portion 51, and when the heating element 53 is energized, the receiving portion 51 of one tube piece 40 and the insertion portion of the other tube piece 40 are inserted. 52 and the two tube pieces 40 are joined.

  Here, before joining the two pipe pieces 40, the insertion part 52 of the other pipe piece 40 is inserted into the receiving part 51 of one pipe piece 40, and the two pipe pieces 40 It is strongly hit at the end of.

  FIG. 12 is a perspective view showing a state where the insertion portion 52 of the tubular piece 40 is inserted into the receiving portion 51 of the tubular piece 40. A fastening wire 54 is wound around each pipe piece 40 at two places, and the fastening wires 54 are fastened back and forth with a fastening tool 56 such as a lever block (registered trademark), so that the insertion portion 52 is pressed against the receiving portion 51. Can be In this state, when the heating element 53 is energized as described above, the receiving portion 51 and the insertion portion 52 are thermally fused and firmly connected.

  FIG. 13 is a view showing a state in which the two tube pieces 40 are thermally fused. By inserting the insertion portion 52 into the receiving portion 51, as shown in FIG. Contacts the outer peripheral surface of the insertion portion 52. In this state, when power is supplied to the heating element 53 from the outside via the power supply cable 50, the temperature of the heating element 53 rises, so that the inner peripheral portion of the receiving portion 51 and the outer peripheral portion of the insertion portion 52 are shown in FIG. As shown in FIG. 13 (B), a fusion part 57 is formed. When the molten portion 57 is cooled and solidified, as shown in FIG. 13 (C), the receiving portion 51 and the insertion portion 52 are in a state in which the resin structure is integrated, and the two tubular pieces 40 are separated from each other at the ends. Joined.

  A plurality of pipe pieces 40 are arranged inside the iron pipe line 10, and ends of the respective pipe pieces 40 are joined to each other. FIG. 14 is a cross-sectional view showing, for example, the joint of the pipe pieces 40c and 40d exposed to the outside from the connection opening 33. A spacer 58 is provided on the outer peripheral bottom surface near the insertion portion 52 of the pipe piece 40d. Is provided. The thickness of the spacer 58 in the radial direction corresponds to the thickness of the receiving portion 51, and a gap is formed between the insertion portion 52 and the inner bottom surface of the iron pipeline 10. Thus, when inserting the insertion portion 52 into the receiving portion 51, the insertion portion 52 can be easily inserted only by shifting the pipe piece 40 in the axial direction in the iron pipe line 10 (that is, without lifting the insertion portion 52). It is inserted into the receiving portion 51. Furthermore, each pipe piece 40 is arranged substantially coaxially with the axis of the iron pipe line 10.

  Further, corresponding to the tapered projection 39a of the cutting and removing portion 33a to be reconstructed after being removed, a tapered notch provided at the upper end surface of the connection opening 33 to 35 of the existing iron pipeline 10 is provided. The fastening tool 56 can be installed at the portion 39b.

  When the spacer 58 is displaced in the circumferential direction from the outer peripheral bottom surface of the tubular piece 40 d, the tubular piece 40 on the insertion side is rotated in the circumferential direction before the insertion portion 52 is inserted into the receiving portion 51. The spacer 58 is positioned on the bottom surface of the outer periphery.

  FIG. 15A is a half sectional view showing a modified example of the tube piece 40, and FIG. 15B is a half sectional view showing another modified example of the tube piece 40. The pipe piece 40 in FIG. 15A is of a single receiving type, and a receiving portion 51 is provided integrally with the main body. On the other hand, the pipe piece 40 of FIG. 15B is of a double receiving type, and the receiving portion 51 is joined to the main body. Each of these tube pieces is of a straight type.

  FIG. 16A is a half-sectional view showing an example of a bent-type tube piece 40, and FIG. 16B is a half-sectional view showing a modification of the bent-type tube piece 40.

  The tube piece 40 shown in FIG. 16A is a bending type having a bending angle θ of 20 degrees, and includes a receiving portion side portion 45 provided with a receiving portion 51 and an insertion side portion 46 provided with an insertion portion 52. have. On the other hand, the tube piece 40 shown in FIG. 16 (B) has an intermediate portion 47 between the receiving portion side portion 45 and the insertion side portion 46, and the bending angle θ is 45 degrees. In addition, the bending angle can be freely set and manufactured.

  Next, a procedure of an updating method for updating the iron pipeline 10 of the existing pipeline to a new pipeline will be described.

  As shown in FIG. 4, in the opening forming step, the insertion openings 31 and 32 for inserting the tube pieces 40 and the connection openings 33 to 35 for exposing the joining surfaces of the tube pieces to the outside. Is formed in the iron pipeline 10. FIG. 4 shows a state in which all openings formed in the iron pipeline 10 in the opening forming step are formed. FIG. 4 shows a state in which all the openings 31 to 35 are provided before the next step is started. However, after the next step is completed in the downstream openings, An opening may be provided.

  Next, the pipe piece is inserted into the iron pipe line 10 through the insertion opening. FIG. 5 shows a state in which the tubular piece 40a and the tubular piece 40b are inserted from the insertion opening 31. Each of the pipe pieces 40a and 40b is moved to a predetermined installation position, and the receiving portion 51 at the base end faces the upstream side and the insertion portion 52 at the distal end faces the downstream side. Further, the pipe piece 40c is inserted through the insertion opening 32, and the pipe piece 40c is moved to an installation position where the distal end thereof contacts the base end of the pipe piece 40b. Thereby, the three pipe pieces 40a, 40b, and 40c are moved to the set positions, and the three pipe piece installation steps are completed.

  A receiving portion 51, which is a base end portion of an adjacent pipe piece 40a inside an existing pipeline, is joined to an insertion portion 52, which is an end portion inserted and abutted therein, to form two pipe pieces. 40a and 40b are connected. In this connection step, as shown in FIG. 13, electric power is supplied to the heating element 53 in a state where the two pipe pieces 40a and 40b are fastened through the insertion opening 31 as shown in FIG. It is done by supplying. Similarly, the receiving part 51 which is the base end of the two pipe pieces 40b and the insertion part 52 of the pipe piece 40c inserted and abutted therein are joined to form the two pipe pieces 40a. , 40b are connected. The two connecting steps are performed through the insertion opening 31. Thus, the insertion opening 31 also serves as the connection opening.

  As shown in FIG. 6, the insertion opening 31 is closed by a cutting / removing portion 31a as a closing member. As described above, when the closing step of closing the opening is performed, the cutting and removing portion 31a is returned as the closing member, and is restored to the iron pipeline 10 as the existing pipeline. Thereby, the pipe pieces 40a and 40b are laid inside the existing iron pipe line 10. In order to form the opening 31 for insertion, the closing member can use the cut and removed portion 31a formed when a part of the iron pipe line 10 is cut off. In this way, the tube piece can be covered by reusing the cutting and removing portion 31a. As shown in FIG. 14, a gap 59 is formed between the outer peripheral surface of the pipe piece and the inner peripheral surface of the iron pipe line 10.

  The reinforcing member 36 is not shown in the cutting and removing section 31a shown in FIG. As shown in FIG. 9, when the cutting and removing portion 33 a is used as the closing member, a reinforcing member is provided on the outer peripheral surface of the cutting and removing portion 33 a in order to easily position the cutting and removing portion 33 a in the insertion opening 33. 36 may be provided, and both end surfaces 38 may be inclined surfaces as shown in FIG. Further, a projection 39a may be provided.

  FIG. 7 shows a state in which the solidifying material is injected into the gap 59 after the opening is closed by the closing step. In the injection step of injecting the solidifying material, as shown in FIG. 7, an injection pipe 62 is attached to the downstream end of the closing member 31a, and a solidifying material such as mortar is externally inserted into the gap 59 via the injection pipe 62. inject. When the solidified material is injected from a downstream portion, the solidified material is filled so as to push up the air in the gap 59. Thereby, the solidified material can be filled more reliably and more tightly without generating a gap due to the accumulation of air in the gap 59 as compared with the case where the solidified material is injected from the upper end of the closing member 31a.

  FIG. 8 shows a state where another pipe piece 40 is installed in the iron pipe line 10 in the illustrated area. That is, a state is shown in which the tube piece 40d is connected to the tube piece 40c, and is sequentially set up to the tube piece 40h toward the upstream side.

  The connection step of connecting the pipe piece 40c and the pipe piece 40d is performed through the connection opening 33, and from the respective connection openings to the outside through the other connection openings 34 and 35. Connect the exposed joints. Each of the pipe pieces 40d to 40f is inserted from the insertion opening 32 and moved to a predetermined installation position. The bent type pipe piece 40g is inserted through the insertion opening 32 and is joined to the pipe piece 40h. The tube piece 40h is inserted from an insertion opening (not shown) provided upstream of the insertion opening 32.

  After the pipe piece 40 is installed at the predetermined installation position and joined in the connecting step, the cutting and removing sections 33a to 35a as closing members are attached to the connecting openings 33 to 35 by the closing step, and the insertion opening is provided. A cutting and removing portion 32a is attached to the portion 32 as a closing member. In FIG. 8, each of the cutting and removing portions 32a to 35a is indicated by a two-dot chain line.

  FIG. 8 shows a state in which the cutting and removing parts 32a to 35a are not attached, but the cutting and removing parts are sequentially attached from the opening on the downstream side, and the pipe piece and the iron pipe of the existing pipe are connected. The solidifying material is injected into the gap 59 between the solidified material and the solidified material. Injection of the solidifying material is preferably performed as one block between the bent portions, but may be performed at an intermediate portion depending on the distance.

  As described above, when the resin pipe piece 40 is laid inside using the existing pipe, the updated pipe becomes a double pipe, and the existing pipe made of iron is used as a sheath pipe to take advantage of its strength. Thus, the strength of the renewed pipeline can be increased, and the durability can be improved. Since the pipe piece 40 is laid inside the existing pipe made of iron, the inner diameter of the pipe piece for water flow is smaller than the inner diameter of the existing pipe. Since the frictional resistance of water to the inner peripheral surface is smaller than that of the inner peripheral surface of the existing iron pipe, a decrease in water flow can be suppressed.

  When the above-mentioned high-pressure polyethylene pipe is used as the pipe piece 40, the high-pressure polyethylene pipe has high-density polyethylene as a main component, glass fiber is compounded inside, and is lightweight, high-strength, and flexible. .

  The invention made by the inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an exemplification in all respects, and is limited to the disclosed technology. is not. That is, the technical scope of the present invention is not to be interpreted restrictively based on the description in the above embodiment, but should be interpreted according to the description of the claims. And any modifications that do not depart from the gist of the claims and the technology equivalent to the technology described in the claims.

  For example, the pipe updating method of the present invention can be applied not only to an iron pipe as a penstock used for hydroelectric power generation, but also to a pipe for supplying water for updating the pipe. . The pipeline that can be updated is not limited to a pipeline laid on an inclined ground, but may be a pipeline laid on a horizontal ground, and the bent portion may be a portion bent in the horizontal direction.

  Further, the tube piece 40 is not limited to a material mainly composed of high-density polyethylene, but may be made of various materials that can secure a desired roughness coefficient.

  Furthermore, if the design flow rate can be changed downward due to changes in geographical or social conditions from when the existing pipeline was laid to when it was renewed, the existing pipeline could be used regardless of the roughness coefficient. A smaller diameter pipe piece 40 can be used.

  The present invention can be applied to update existing pipelines laid laying on the ground to supply water and replace them with new pipelines, for example, penstocks used for hydropower generation. It is suitable for updating.

DESCRIPTION OF SYMBOLS 1 Weir body 2 Regulating pond 3 Waterway 4 Power plant 5 Drainage channel 6 Slope 10 Iron pipeline (existing pipeline)
11 to 14 straight regions 15 to 17 bending portions 21 to 24 fixing table 25 small supports 31, 32 insertion openings 31a to 35a cutting / removing section (closing member)
33 to 35 Connection opening 36 Reinforcement member 37 Protruding end 39a Projection 39b Notch 40, 40a to 40g Pipe piece 41 Cable crane 42 Guide cable 43 Hook 45 Receiving part side part 46 Insertion side part 50 Feeding cable 51 Receiving Part 52 insertion part 53 heating element 54 fastening wire 56 fastening tool 57 fusion part 58 spacer 59 gap 62 injection pipe

Claims (9)

A method of updating a pipeline for updating an existing pipeline for water passage laid exposed on the ground with a new pipeline,
An opening for inserting a tube piece, and a connection opening for exposing a joint between the tube pieces to the outside, an opening forming step of forming an existing pipeline to be updated,
A pipe piece installation step of inserting the pipe piece from the insertion opening and moving the pipe piece to an installation position of the existing pipeline;
A connection step of connecting the end portions of the pipe pieces adjacent to each other in the existing pipe line via the connection opening;
A closing step of closing the insertion opening and the connection opening with a closing member having a shape corresponding to the insertion opening and the connection opening;
An injection step of injecting a solidifying material into a gap between the pipe piece and the existing pipe. The existing pipeline is an iron pipeline that is laid on a slope and supplies water at a water source side to a power generation device of a power plant.In the pipe piece installation step, the pipe piece inserted from an insertion opening is used. Is moved toward the lower side of the existing pipeline and installed.
2. The method for updating a pipeline according to claim 1, wherein: The insertion opening and the connection opening are formed by a cutting and removing portion obtained by cutting an upper portion having a semicircular cross section in the existing pipeline, and inserting the cutting and removing portion in the closing step. Return to the existing pipeline by returning as a closing member to the opening for connection and the opening for connection,
The method for updating a pipeline according to claim 1 or 2, wherein: An arc-shaped reinforcing member was fixed to the outer peripheral surface of the cutting and removing portion before cutting the cutting and removing portion,
The method for updating a pipeline according to claim 3, wherein: The insertion opening is longer than the axial length of the tubular piece, and the connection opening is shorter in the axial direction than the insertion opening.
The method for updating a pipeline according to any one of claims 1 to 4, wherein: The insertion opening also serves as the connection opening,
The method for updating a pipeline according to any one of claims 1 to 5, wherein: The existing pipeline has a bent portion in a path, and the bent portion is provided with the insertion opening,
The method for updating a pipeline according to any one of claims 1 to 6, wherein: The roughness coefficient of the pipe piece is lower than the roughness coefficient of the existing pipeline,
The method for updating a pipeline according to any one of claims 1 to 7, wherein: The existing pipe is made of iron, and the pipe piece is made of resin.
The method for updating a pipeline according to any one of claims 1 to 8, wherein:

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