JP6986406B2 - Waterway construction method - Google Patents

Description

The present invention relates to a waterway construction method using a steel plate waterway member.

Concrete construction is generally used for waterway construction. However, in recent years, there are cases where a waterway is formed by connecting steel plate waterway members that are easy to construct. When a waterway is constructed on particularly soft ground, a steel plate waterway member that is lightweight and has high strength is often used (see, for example, Patent Document 1).

When constructing a canal using a steel plate canal member, a groove is dug in the ground and the steel plate canal member is laid in the groove. The plurality of steel plate canal members are fixed to each other, and a structural member called a girder is bridged over the upper end of the U-shaped steel plate canal member. Then, in the state where the steel plate water channel member is assembled, the water channel is completed by backfilling the soil in the gap between the groove and the steel plate water channel member.

Japanese Unexamined Patent Publication No. 2002-121731

On the other hand, when the waterway is constructed with a steel plate waterway member using a plated steel plate, the steel plate waterway member is assembled in a groove dug in the ground. Therefore, there is a problem that it is difficult and time-consuming to fasten bolts and nuts when fixing the steel plate water channel members to each other. When assembling a plurality of steel plate canal members outside the groove, if the thickness of the steel plate constituting the steel plate canal member is thin, the rigidity of the canal assembly connecting the steel plate canal members is low, and the canal assembly is grooved. There is a problem that it is difficult to install the steel sheet because it is deformed when it is lifted by a crane or the like.

The present invention is to solve the above-mentioned problems, and to facilitate the assembly work by enabling the assembly work of the waterway assembly outside the groove dug in the ground, and to provide a waterway construction method with improved workability. The purpose is to provide.

The waterway construction method of the present invention includes a flow path portion assembling step of assembling a flow path portion by combining a plurality of flow path members made by molding a steel plate, and attaching a ventilator along the upper end portion of the flow path portion. A water channel assembly step of assembling a water channel assembly by an abdominal material mounting step and a girder mounting process of attaching a girder connecting between the abdominal materials, and attaching a lifting member to the abdominal material or the girder. The waterway assembly step comprises an arrangement step of lifting the waterway assembly and arranging the lifted waterway assembly in a groove formed in the ground, and the waterway assembly step is performed outside the groove .

According to the present invention, the channel assembly can be facilitated by assembling the channel member, the abdominal lumber, and the girder outside the groove in which the channel is installed. Further, since the work of assembling the waterway assembly can be carried out in parallel with the work of installing the waterway assembly in the groove, there is an advantage that the construction period can be shortened.

It is a perspective view of the waterway 100 formed by the steel plate waterway member which concerns on Embodiment 1 of this invention. It is a perspective view of the water channel assembly 10 which constitutes a part of the water channel 100 of FIG. It is a figure which shows the cross section perpendicular to the flow path direction of the channel assembly 10 of FIG. It is a figure which shows the comparison result of the Example and the comparative example of the flow path member 1 which concerns on Embodiment 1 of this invention. FIG. 3 is a perspective view showing an example of a state in which the water channel assembly 10 of FIG. 2 is lifted. It is a figure which shows an example of the process by the waterway construction method which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the waterway construction method according to the present invention will be described. The form of the drawings is an example and does not limit the present invention. Further, those having the same reference numerals in each figure are the same or equivalent thereof, which are common to the whole text of the specification. Further, in the drawings below, the relationship between the sizes of the constituent members may differ from the actual one.

Embodiment 1.
[Construction status of waterway 100]
FIG. 1 is a perspective view of a water channel 100 formed by a steel plate water channel member according to the first embodiment of the present invention. As shown in FIG. 1, the water channel 100 is configured by connecting a plurality of water channel assemblies 10 with a connecting portion 11. The flow path member 1 of the water channel assembly 10a on the upstream side and the flow path member 1 of the water channel assembly 10b on the downstream side are connected to each other. In the following description, the water channel assemblies 10a, 10b, and 10c may be collectively referred to as the water channel assembly 10. Further, the water channel assembly 10 is configured by connecting a plurality of flow path members 1. The flow path member 1 constitutes a water channel 100 in a state where the lower half of the body is embedded in the ground while being connected to each other. Therefore, the channel member 1 is installed in an environment where bacterial corrosion is likely to occur because it comes into contact with soil, which is a habitat for grass or insects.

The waterway 100 is used for an agricultural waterway, an industrial waterway, a temporary waterway for civil engineering work, and the like. The water channel 100 is an open channel with an open upper part through which water flows. In addition, fallen leaves or dust may flow into the water channel 100. In addition, mud may flow into the water channel 100.

[Waterway Assembly 10]
FIG. 2 is a perspective view of the water channel assembly 10 constituting a part of the water channel 100 of FIG. FIG. 3 is a diagram showing a cross section of the water channel assembly 10 of FIG. 2 perpendicular to the flow path direction.
The downstream end portion of the flow path member 1 on the upstream side and the upstream end portion of the flow path member 1 on the downstream side are overlapped with a sealing material interposed therebetween. The downstream end portion of the flow path member 1 on the upstream side is overlapped so as to be above the upstream end portion of the flow path member 1 on the downstream side. This prevents mud and the like flowing through the water channel 100 from accumulating at the bottom of the water channel 100. In the connecting portion, the downstream end portion of the flow path member 1 on the upstream side and the upstream end portion of the flow path member 1 on the downstream side are bolted and connected.

An abdominal raising material 3 is attached to the upper end edges of the side wall portions 1a and 1b for reinforcement in the flow path member 1. The raised material 3 is made of, for example, L-shaped steel or H-shaped steel, and is provided on the upper end edges of the side wall portions 1a and 1b of the flow path member 1 along the flow path direction. The abdominal raising material 3 is bolted and fixed to the flow path member 1. Hereinafter, the two abdominal raising materials 3a and 3b on the upper end edge of the flow path member 1 may be collectively referred to as the abdominal raising material 3.

In the flow path member 1, the cutting beam 4 is arranged so as to be bridged by the abdominal raising material 3 fixed to the upper end edges of the left and right side wall portions 1a and 1b with respect to the flow path direction. The girder 4 is made of, for example, L-shaped steel or a steel pipe, and is provided so as to pass through the abdominal starting material 3 fixed to the upper end edges of the left and right side wall portions 1a and 1b in the width direction orthogonal to the flow path direction. Has been done. The girder 4 is bolted and fixed to the abdominal starting material 3.

The water channel assembly 10 is configured by connecting a plurality of flow path members 1. Each flow path member 1 is made of a corrugated steel plate having a corrugated cross section along the flow path direction. The flow path member 1 is formed by bending a corrugated steel material having a corrugated cross section along the flow path direction in which peaks and valleys are alternately continuous in the longitudinal direction, which is the flow path direction. The flow path member 1 is curved and molded into a U-shaped groove. The flow path member 1 may be formed into a U shape by combining a plurality of bent steel materials, but the rigidity and strength are high by being integrally formed into the U shape, and the man-hours for assembling the water channel assembly 10 is reduced. It has the advantage of being able to.

The flow path member 1 has left and right side wall portions 1a and 1b and a lower bottom wall portion 1c so as to form a U-shaped groove. The flow path member 1 has side wall portions 1a and 1b standing upright from the bottom wall portion 1c to both left and right end portions. The bottom wall portion 1c and the side wall portions 1a and 1b are connected by being curved and having corners formed into an R curve.
The flow path member 1 is formed with bolt holes (not shown) for connection at the upstream end, the downstream end, and the upper edge.

The flow path member 1 is not limited to the shape of the U-shaped groove. The flow path member 1 may have any shape as long as it can be formed by bending a corrugated steel material having a corrugated cross section along the flow path direction. The bottom wall portion 1c may be entirely formed with an R curve.

Further, the flow path member 1 is attached with flange portions 2a and 2b that project to the left and right outside of the upper edge portions of both side wall portions 1a and 1b and are provided along the flow path direction. In the first embodiment, the flange portions 2a and 2b are fixed to the side surface of the upper end portion of the flow path member 1, but the flange portion 2a and 2b are not limited to this and are integrally formed with the flow path member 1. May be.

The flange portions 2a and 2b are attached to the flow path member 1 at a plurality of locations along the flow path direction. Alternatively, the flange portions 2a and 2b may be continuous and integrated along the flow path member 1, respectively.

Abdominal members 3a and 3b are placed on the flat surface portions 2aa and 2ba on the upper end side of the flange portions 2a and 2b, respectively. In the first embodiment, the abdominal raising material 3a has an H-shaped cross section. Then, a horizontal plate-shaped portion in the center of the H shape is placed on the flat surface portion 2aa of the flange portion 2a. The raised material 3a and the flange portion 2a are fixed to each other by fastening members such as bolts 5a and nuts 6a. An insulating material may be sandwiched between the raised material 3a and the flat surface portion 2aa of the flange portion 2a. By placing the abdominal material 3a on the flat surface portion 2aa via the insulating material, the metal abdominal material 3a and the flange portion 2a do not come into direct contact with each other, so that electrolytic corrosion can be prevented. .. The flange portion 2b and the abdominal raising material 3b also have the same structure as the flange portion 2a and the abdominal raising material 3a.

A girder 4 is installed between the abdominal raising material 3a and the abdominal raising material 3b. One end of the girder 4 is fixed to the abdominal material 3a, and the other end is fixed to the abdominal material 3b. The girder 4 is, for example, one in which plate members 4a and 4b are welded to both ends of a steel pipe 4c. By fixing the plate material 4a to the side surface portion of the abdominal raising material 3a and fixing the plate material 4b to the side surface portion of the abdominal raising material 3b, the girder 4 integrates the two abdominal raising material 3a and the abdominal raising material 3b. Fixing between the plate material 4a and the abdominal material 3a, and between the plate material 4b and the abdominal material 3b is performed by a fastening member such as a bolt and a nut, or by means such as welding. Since at least two cutting beams 4 are passed between the abdominal raising material 3a and the abdominal raising material 3b at intervals and fixed at four places, they are composed of the abdominal raising material 3a, the abdominal starting material 3b, and the cutting beam 4. The members have high rigidity and stable shape.

[Component composition of flow path member 1]
The steel material of the flow path member 1 is stainless steel. Further, the steel material is preferably ferritic stainless steel among stainless steels. In particular, the steel material is most preferably SUS443J1 (JIS standard) among ferritic stainless steels.

Here, SUS443J1 is mass%, C: 0.03% or less, Si: 1.0% or less, Mn: 0.5% or less, P: 0.04% or less, S: 0.02% or less. , Al: 0.1% or less, Cr: 20.5% or more, 22.5% or less, Cu: 0.3% or more, 0.8% or less, Ni: 1.0% or less, Ti: 4 × ( C% + N%) or more, 0.35% or less, Nb: 0.01% or less, N: 0.03% or less, C + N: 0.05% or less, and the balance consists of Fe and unavoidable impurities. The following formula (1) is satisfied.
[Equation (1)] 240 + 35 × (Cr% -20.5) + 280 × {Ti% -4 × (C% + N%)} ≧ 280
Here, C%, N%, Cr%, and Ti% represent the contents (mass%) of C, N, Cr, and Ti, respectively.

[Contrast between Examples and Comparative Examples]
FIG. 4 is a diagram showing comparison results of an example and a comparative example of the flow path member 1 according to the first embodiment of the present invention.
The present inventors have the present invention of Example 1-3 in which the steel material of the flow path member 1 is SUS443J1, Example 4, which is a steel material containing other stainless steel, Example 5 which is SUS430, and Example 6 which is SUS304. Verification was performed by comparing the example with Comparative Example 1-3.
Example 1-3 is a steel material in which the steel material satisfies the composition of SUS443J1.
In the fourth embodiment, the steel material is stainless steel which is not SUS443J1. In Example 5, the steel material is SUS430. In Example 6, the steel material is SUS304. In Comparative Example 1, the steel material is a galvanized steel sheet HDZ45. In Comparative Example 2, the steel material is a galvanized steel sheet HDZ55. In Comparative Example 3, the steel material is a hot-rolled steel sheet.

In FIG. 4, the criteria for each test and verification are as follows.

(1) Salt spray test on flat plate material: A test piece of 2 mm × 70 mm × 150 mm was tested for 5000 hours by spraying 5% NaCl in a tank at 35 ° C. in accordance with JIS K 5600-7-1. rice field. After the test, if the red rust generation surface rate is less than 10%, ◎ (pass), if it is 10% or more and less than 30%, ○ (possible), if it is 30% or more and less than 50%, △ (inappropriate), and if it is 50% or more. If there is, it was judged as × (failure).

(2) Salt spray cycle test on a welded material having a welded portion: Two 2 mm × 35 mm × 150 mm test pieces were TIG welded in the longitudinal direction. After polishing the surface of the welded portion # 600, it was subjected to a test. A 30-cycle test was carried out in which 5% NaCl was sprayed for 2 hours (35 ° C.) → dry (60 ° C., RH 30%) for 4 hours → wet (50 ° C., RH 95%) for 2 hours. If the area ratio of red rust generated in the weld is less than 10%, ◎ (pass), if it is 10% or more and less than 30%, ○ (possible), if it is 30% or more and less than 50%, △ (inappropriate), 50%. If it is more than that, it is judged as × (failure).

(3) Magnetism: A normal ferrite magnet of 15 mmφ was brought close to each other, and it was judged as ◯ (possible) if there was an attractive force, and × (failed) if there was no attractive force.

(4) Initial introduction cost: As a purchase cost, if the cost is equal to or less than that of the conventional galvanized steel sheet HDZ45, ◎ (pass), if it is more than 1 times and 1.75 times or less, ○ (possible), 1. If it exceeds 75 times and is 3 times or less, it is determined as Δ (inappropriate), and if it exceeds 3 times, it is determined as × (failure).

(5) Life cycle cost (LCC): The total cost of 40 years, which is the general period until renewal including repair and maintenance costs including the initial cost of installation, is 1/3 of the conventional galvanized steel sheet HDZ45. If it is less than or equal to ◎ (pass), if it is more than 1/3 and less than 0.8 times, it is ○ (possible), if it is more than 0.8 times and less than 1 times, it is △ (inappropriate), and if it is 1 times or more, it is × ( Fail).

As shown in FIG. 4, in the example of the present invention according to the embodiment 1-3 of the present invention, the low initial introduction cost of the flow path member 1, the improvement of the corrosion resistance in outdoor exposure, and the partial welding under water exposure are performed. Improvement of corrosion resistance was observed in the part. Due to these effects, the life cycle cost of the flow path member 1, which is basically two characteristics required as a synergistic effect, can be remarkably reduced, and the long-term durability is remarkably excellent. Therefore, it can be seen that all the characteristics required for future waterway equipment can be improved.

Since the flow path member 1 is made of stainless steel, the yield strength and tensile strength are improved with respect to the galvanized steel sheets of Comparative Examples 1 and 2 and the hot-rolled steel sheets (hot rolled steel sheets) of Comparative Example 3. .. Therefore, when the flow path member 1 is made of stainless steel, the thickness can be reduced. For example, Comparative Examples 1 to 3 have a thickness of 2.7 mm, whereas Examples 1 to 6 made of stainless steel have a thickness of 2 mm. Therefore, when assembling the water channel assembly 10, the weight of the channel member 1 is lightened, so that it is easy to handle when connecting the channel members 1 to each other, and the weight of the entire channel assembly 10 can be reduced. Further, since the member in which the abdominal rising member 3 and the cutting beam 4 are joined has high rigidity, the rigidity of the channel assembly 10 as a whole is high even if the thickness of the flow path member 1 is thin and the rigidity is low. Therefore, the water channel assembly 10 does not lose its shape even when it is arranged in the groove in which the water channel 100 is installed, so that the water channel assembly 10 can be easily installed. However, the thickness of the material constituting the flow path member 1 is not limited to 2 mm or less, and can be appropriately set. Even when the material is thick and the weight of the flow path member 1 is heavy, the member composed of the abdominal raising material 3 and the girder 4 has high rigidity, so that the shape of the water channel assembly 10 can be installed without being deformed. ..

[Construction method of waterway 100]
(Existing waterway removal process)
In the first embodiment, a case where the existing waterway is removed and a new waterway 100 is installed therein will be described. Drain the water flowing through the existing canal and remove the existing canal assembly embedded in the ground. This process is called the existing waterway removal process. After removing the existing waterway, since the groove remains in the ground, the soil inside the groove is removed according to the width and depth of the new waterway 100. Further, pressure may be applied to the side surface and the bottom surface of the groove in the ground to harden the side surface and the bottom surface of the groove. The waterway 100 is not limited to the case where the existing waterway is removed and installed, and the waterway 100 can be newly installed on the ground where the existing waterway is not installed. When the waterway 100 is installed on the ground where the existing waterway is not installed, a new groove is created and the waterway 100 is installed in the groove.

(Waterway assembly process)
Assemble the channel assembly 10. This process is called a waterway assembly process. The channel assembly process is performed outside the groove in which the channel 100 is installed. By doing so, workability can be improved and the time required for assembly can be shortened. The water channel assembly step includes a flow path portion assembly step, an abdominal raising material mounting step, and a girder mounting step.

(Flow path assembly process)
A plurality of flow path members 1 are combined and connected in the flow direction. The flow path members 1 are fastened to each other by fastening members such as bolts and nuts. This process is called a flow path portion assembly process. Further, in the flow path portion assembling step, the flange portions 2a and 2b are attached to the upper end portions of the side wall portions 1a and 1b of the flow path member 1. By performing the flow path portion assembling process outside the groove in which the water channel 100 is installed, the fastening component for fastening the flow path members 1 to each other is fastened from either the inside or the outside of the U-shaped flow path member 1. And workability is improved.

(Beam mounting process)
A girder 4 is attached between the abdominal raising material 3a and the abdominal raising material 3b. This is called the girder mounting process. In the first embodiment, the abdominal raising material 3a and the abdominal raising material 3b are H-shaped steels having the same length. The end of the girder 4 is fixed between the side surfaces of the abdominal starting members 3a and 3b. Specifically, the plate material 4a at the end of the cutting beam 4 is fastened to the side surface of the raising material 3a, and the plate material 4b at the end of the cutting beam 4 is fastened to the side surface of the raising material 3b by fastening members such as bolts and nuts. Will be done. Further, at least two cutting beams 4 are fixed between the abdominal raising material 3a and the abdominal raising material 3b. As a result, the abdominal raising material 3a, the abdominal raising material 3b, and the two cutting beams 4 are integrated to form a highly rigid structure.

(Abdominal material mounting process)
The two ventral members 3a and 3b integrated by the girder 4 are placed and fixed on the flange portions 2a and 2b attached to the upper ends of the flow path member 1. This process is called an abdominal material mounting process. The abdominal members 3a and 3b are fixed to the flange portions 2a and 2b by fastening members such as bolts 5a and 5b and nuts 6a and 6b. In the abdominal raising material attaching step, the fastening member is fastened in the vertical direction, but by performing the fastening member outside the groove in which the water channel 100 is installed, the work can be performed without being affected by the surrounding environment.

The flow path assembly process, the abdominal material mounting process, and the girder mounting process that constitute the water channel assembly process are performed outside the groove in which the water channel 100 is installed. The assembly 10 may be assembled and transported to the place where the water channel 100 is installed. By doing so, there is an advantage that the man-hours for assembling each water channel assembly 10 are reduced and the assembly accuracy is also improved. In the cutting beam attaching step, the abdominal raising material 3a and the abdominal raising material 3b may be attached between the abdominal raising materials 3a and 3b after being attached to the flange portions 2a and 2b.

(Placement process)
FIG. 5 is a perspective view showing an example of a state in which the water channel assembly 10 of FIG. 2 is lifted. In the first embodiment, a wire 20 is attached in the vicinity of the connection portion between the girder 4 of the water channel assembly 10 and the ventilator 3, the water channel assembly 10 is lifted upward, and a predetermined arrangement inside the groove in which the water channel 100 is installed. Move to a place. The upper end of the wire 20 is attached to a rectangular lifting jig 30, and the wire 20 is suspended from the lifting jig 30. Four wires, wires 20a, 20b, 20c, and 20d, are attached to the corners of the rectangular lifting jig 30. The wires 20a, 20b, 20c, and 20d may be collectively referred to as the wire 20. Further, a lifting tool 40 is attached to the lifting jig 30, and the water channel assembly 10 and the lifting jig 30 are lifted by pulling the lifting tool 40 with a crane or the like.

The distance between the wire 20a and the wire 20b and the distance between the wire 20c and the wire 20d are set to match the distance between the cutting beams 4 of the channel assembly 10. Further, the distance between the wire 20a and the wire 20d and the distance between the wire 20b and the wire 20c are set to be about the same as the length of the cutting beam 4. Therefore, the channel assembly 10 is pulled vertically upward by the wire 20 when it is lifted. Therefore, when the water channel assembly 10 is lifted, the force in the horizontal direction applied to the portion to which the wire 20 is attached is small, so that deformation or breakage due to the lifting can be suppressed. The water channel assembly 10 has a highly rigid structure due to the abdominal raising material 3 and the girder 4, but the weight of the water channel assembly 10 becomes heavy especially when a large number of flow path members 1 are connected to form the water channel assembly 10. However, it is possible to suppress deformation and damage due to lifting. Further, by lifting the water channel assembly 10 via the lifting jig 30, the water channel assembly 10 can be easily leveled, and the water channel assembly 10 can be accurately arranged in the groove in which the water channel 100 is installed. In the present invention, the wire 20 corresponds to a "lifting member". Further, in the first embodiment, the wire 20 may be replaced with, for example, a chain or a bar having a hook at the tip thereof.

(Connection process)
After arranging a plurality of water channel assemblies 10 in the groove in which the water channel 100 is installed, the work of connecting to other adjacent water channel assemblies 10 is performed. This is called a connection process. In the connection step, the flow path members 1 of the two adjacent water channel assemblies 10 are fastened to each other by fastening members such as bolts and nuts and fixed to each other. Further, the abdominal members 3a and 3b of the adjacent water channel assemblies 10 are also fixed to each other. As shown in FIG. 1, the connecting portion 11 of the water channel assembly 10 connects the abdominal raising material 3a on the upstream side and the abdominal raising material 3a on the downstream side by passing bolts and nuts through a plate. The abdominal members 3b on the opposite side are also connected to each other in the same manner.

(Backfill process)
After the process of connecting the adjacent water channel assemblies 10 to each other is completed, the work of filling the gap between the groove and the water channel assembly 10 is performed. By being supported by the surrounding soil, the flow path member 1 constituting the water channel 100 can support the force from the water flowing in the water channel 100, and the connection portion 11 between the channel members 1 is damaged or flows. Deformation of the road member 1 and the like are suppressed. In the first embodiment, the water channel assembly 10 is arranged in the groove after the existing water channel is removed. The groove is slightly larger than the width of the channel assembly 10 in consideration of workability. Therefore, the amount of soil to be backfilled may be only the gap between the channel assembly 10 and the groove.

FIG. 6 is a diagram showing an example of a process according to the waterway construction method according to the first embodiment of the present invention.
In the installation of the water channel 100, the existing water channel removal process, the water channel assembly process, the arrangement process, the connection process, and the backfilling process may be performed in parallel. For example, suppose there are a first existing channel assembly, a second existing channel assembly, a third existing channel assembly, a first channel assembly 10a, a second channel assembly 10b, and a third channel assembly 10c. At that time, while the existing waterway removal process for removing the first existing waterway assembly, the second existing waterway assembly, and the third existing waterway assembly is in progress, the waterway assembly process of the first waterway assembly 10a and the second waterway assembly 10b is performed. You can proceed.

When the first existing waterway assembly and the second existing waterway assembly are removed, the first placement step, which is the placement step of the assembled first waterway assembly 10a, is performed. After the first placement step is complete, the second channel assembly 10b is subsequently placed. This is called a second placement step. The third channel assembly 10c is placed after the second placement step is completed.

After the arrangement step of the second water channel assembly 10b, the first connection step, which is the connection step between the first water channel assembly 10a and the second water channel assembly 10b, is performed. The first connection step may proceed at the same time as the third placement step.

After the first connection step is completed, the first channel assembly 10a is backfilled. This is called the first backfilling process. The first backfilling step may proceed at the same time as the second connecting step, which is the connecting step between the second water channel assembly 10b and the third water channel assembly 10c.

As shown in FIG. 6, the existing waterway removal process, the waterway assembly process, the arrangement process, the connection process, and the backfilling process can be simultaneously performed. The existing waterway removal step is carried out by sequentially repeating the first existing waterway removal step, the second existing waterway removal step, and the third existing waterway removal step. Similarly, in the water channel assembly process, the first water channel assembly process, the second water channel assembly process, and the third water channel assembly process are sequentially repeated. The placement step is started from the middle of the existing waterway removal step and the waterway assembly step, and the first placement step, the second placement step, and the third placement step are sequentially repeated. The connection step is started at least after the completion of the second arrangement step, and the first connection step, the second connection step, and the third connection step are sequentially repeated. The backfilling step is started after at least the first connection step is completed, and the first backfilling step, the second backfilling step, and the third backfilling step are sequentially repeated.

In the first embodiment, the waterway construction method is performed by removing the existing waterway and arranging the waterway assembly 10 in the removed groove, but the method is not limited to this, and even if a new waterway 100 is installed. good. In this case, instead of the existing waterway removing step, a groove forming step of forming a groove in which the waterway 100 is installed is performed. The groove forming process can also proceed simultaneously with the water channel assembly process, the placement process, the connection process, and the backfilling process.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Channel member, 1a Side wall part, 1b Side wall part, 1c Bottom wall part, 2a Flange part, 2aa Flat part, 2b Flange part, 2ba Flat part, 3 Pneumatic material, 3a Pneumatic material, 3b Pneumatic material, 4 Cutting beam, 4a plate material, 4b plate material, 4c steel pipe, 5a bolt, 5b bolt, 6a nut, 6b nut, 10 waterway assembly, 10a 1st waterway assembly, 10b 2nd waterway assembly, 10c 3rd waterway assembly, 11 connection part, 20 wire, 20a wire, 20b wire, 20c wire, 20d wire, 30 lifting jig, 40 lifting tool, 100 water channel.

Claims (11)

The flow path assembly process of assembling the flow path by combining multiple flow path members made by molding a steel plate,
The abdominal raising material attaching step of attaching the abdominal raising material along the upper end portion of the flow path portion, and
A canal assembly step of assembling a canal assembly by a girder attachment step of attaching a girder connecting between the abdominal lumbers, and a canal assembly step of assembling the canal assembly.
It comprises an arrangement step of attaching a lifting member to the abdominal raising material or the girder to lift the channel assembly and arranging the lifted channel assembly in a groove formed in the ground .
The waterway assembly step
Wherein Ru is carried out in the outside of the groove, waterway construction method. The placement step is
Wherein attaching the lifting member at four positions of the belly Okoshizai moves inside the pre Kimizo in a state of lifting upward, waterway construction method according to claim 1. The lifting member is
Suspended from a rectangular lifting jig,
The placement step is
The waterway construction method according to claim 2 , wherein the waterway assembly is lifted via the lifting jig. A connection step of arranging and connecting a plurality of the water channel assemblies in the groove,
The waterway construction method according to any one of claims 1 to 3 , further comprising a backfilling step of filling the gap between the waterway assembly arranged inside the groove and the groove. Further comprising a groove reclamation process of reclamation of the groove in the ground,
The waterway assembly step
It has a first channel assembly process for assembling a first channel assembly, a second channel assembly process for assembling a second channel assembly, and a third channel assembly process for assembling a third channel assembly.
The placement step is
First arranging step of arranging the first water channel assembly inside the groove, placing a second arranging step of arranging the second water channel assembly inside the groove, and the third water channel assembly inside the groove Has a third placement process,
The connection step is
It has a first connection step of connecting the first waterway assembly and the second waterway assembly, and a second connection step of connecting the second waterway assembly and the third waterway assembly.
The backfilling step is
It has a first backfilling step of backfilling the first channel assembly, a second backfilling step of backfilling the second channel assembly, and a third backfilling step of backfilling the third channel assembly.
The groove creation step, the channel assembly step, the placement step, the connection step, and the backfilling step are carried out in parallel.
The first placement step is
Started after the first channel assembly process is completed,
The second placement step is
Started after the first placement step and the second channel assembly step are completed,
The third placement step is
Started after the second placement step and the third channel assembly step are completed,
The first connection step is
Started after the second placement step is completed,
The second connection step is
Started after the third placement step is completed,
The first backfilling step is
Started after the first connection step is completed,
The second backfilling step is
The waterway construction method according to claim 4, which is started after the second connection step is completed. It also has an existing waterway removal process to remove the existing waterway embedded in the ground.
Before Kimizo place the waterway assembly,
The waterway construction method according to claim 4 , wherein the existing waterway is the groove in which the existing waterway is installed. The existing waterway removal process
It has a first existing waterway removal process for removing the first existing waterway, a second existing waterway removal process for removing the second existing waterway, and a third existing waterway removal process for removing the third existing waterway.
The waterway assembly step
It has a first channel assembly process for assembling a first channel assembly, a second channel assembly process for assembling a second channel assembly, and a third channel assembly process for assembling a third channel assembly.
The placement step is
A first arranging step of arranging the first channel assembly inside the groove, a second arranging step of arranging the second channel assembly inside the groove, and arranging the third channel assembly inside the groove. Has 3 placement steps,
The connection step is
It has a first connection step of connecting the first waterway assembly and the second waterway assembly, and a second connection step of connecting the second waterway assembly and the third waterway assembly.
The backfilling step is
It has a first backfilling step of backfilling the first channel assembly, a second backfilling step of backfilling the second channel assembly, and a third backfilling step of backfilling the third channel assembly.
The existing waterway removal step, the waterway assembly step, the placement step, the connection step, and the backfilling step are carried out in parallel.
The first placement step is
It is started after the first existing waterway removal step, the second existing waterway removal step, and the first waterway assembly step are completed.
The second placement step is
It is started after the first placement step, the third existing channel removal step, and the second channel assembly step are completed.
The third placement step is
Started after the second placement step and the third channel assembly step are completed,
The first connection step is
Started after the second placement step is completed,
The second connection step is
Started after the third placement step is completed,
The first backfilling step is
Started after the first connection step is completed,
The second backfilling step is
The waterway construction method according to claim 6, which is started after the second connection step is completed. The connection step is
The waterway construction method according to any one of claims 4 to 7 , wherein the abdominal raising members and the flow path members of the plurality of waterway assemblies are fastened to each other by a fastening member. The flow path member
The waterway construction method according to any one of claims 1 to 8 , which is U-shaped in a cross section perpendicular to the flow direction of the waterway. The flow path portion assembly process is
The waterway construction method according to claim 9 , wherein a part of the adjacent flow path members is overlapped in the flow direction of the waterway, and fastened and connected by bolts and nuts. The flow path member
The waterway construction method according to any one of claims 1 to 10 , which is formed of a stainless steel material.

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