Methods for repairing drainage fences

Abstract

The aim is to simplify construction and shorten the renovation period for existing drainage culverts, without being affected by nearby buildings. [Solution] Existing support beams 16 are installed between the upper ends of the culvert frame of the culvert 11, and a pre-fabricated bottom slab block with a roughly U-shaped cross-section is placed on the bottom surface of the culvert 11. Formwork 33 is assembled from both ends of this bottom slab block up to the support beams 16, and concrete is poured between it and the side wall of the waterway to add a side wall block 34 for renovation. After that, the support beams 16 are removed, formwork 42 is assembled on the side wall block 34, and then concrete is poured to extend the side wall block 34 to the planned height L.

Description

Technical Field

[0001] The present invention relates to a method for renovating (repairing and mending) an existing grid channel that constitutes a waterway.

Background Art

[0002] As a method for constructing a waterway such as an agricultural waterway (water intake channel and drainage channel), a method using the grid channel of Patent Document 1 is known. For example, grid channel frames are installed at equal intervals along the longitudinal direction on both sides of a concave groove dug for a waterway, and a plurality of grid channel plates are laminated between the front and rear grid channel frames to form the side walls of the waterway.

[0003] However, in recent years, the aging of existing grid channels has become a problem. Especially when the wall surface of the grid channel (the group of grid channel plates) is on the verge of collapse, it may cause accidents, so urgent renovation is required. As renovation methods in this case, renovation methods 1 and 2 shown in FIGS. 9 and 10 have been proposed.

[0004] The renovation method 1 in FIG. 9 aims to renovate the grid channel 1 by placing the body concrete 4 and the filling concrete 5 inside the group of grid channel plates 3. Further, the renovation method 2 in FIG. 10 installs the steel sheet pile 2 as a soil retaining structure outside the existing renovation target, and constructs a new waterway while demolishing the existing grid channel 1. In FIG. 10, the box culvert 1a is taken as the renovation target, but it can also be used for the renovation of the grid channel.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, according to repair method 1 in Figure 9, since the base slab 4a is cast-in-place concrete, water cannot be flowed into the waterway until the base slab 4a hardens due to drying, which can prolong the construction process and potentially delay the repair work.

[0007] Furthermore, the repair method shown in Figure 10 may not allow for the driving of steel sheet piles 2 if there are buildings such as houses near the drainage culvert to be repaired. In this case, even if steel sheet piles 2 are installed using a special construction method, the presence of numerous existing drainage pipes from houses and other buildings would necessitate creating horizontal holes in the newly constructed drainage culvert to allow the drainage pipes to pass through, potentially making construction difficult.

[0008] This invention was made to solve these conventional problems, and aims to simplify construction and shorten the renovation period of existing drainage culverts without being affected by the drying of the base slab or nearby buildings. [Means for solving the problem]

[0009] (1) The present invention comprises a fence frame arranged at equal intervals along the longitudinal direction on both sides of a waterway, A fence board is stacked between the front and rear fence frames, Equipped with, A method for repairing a culvert, wherein the culvert frame and the group of culvert boards constitute the side wall of the waterway, The first step involves installing pre-fabricated base slab blocks for renovation onto the bottom surface of the waterway, The invention is characterized by having a second step of constructing a repair side wall block on the inside of the side wall by pouring concrete on both ends of the base plate block.

[0010] (2) One aspect of the present invention is: The method further includes the step of pouring infill concrete between the base slab block and the side wall.

[0011] (3) One aspect of the second step is: After assembling the formwork from both ends of the bottom plate block to a desired height, a step of constructing the side wall block by placing concrete between the formwork and the side wall is provided.

[0012] (4) Another aspect of the second step is When a support beam portion is installed between the upper end portions of the fence channel frames arranged on both sides of the water channel, a step of assembling the formwork from both ends of the bottom plate block to the height of the support beam portion, A step of constructing the side wall block by placing concrete between the formwork and the side wall, After removing the support beam portion and assembling the formwork on the side wall block, a step of expanding the side wall block to a desired height by placing concrete, And a step of removing each formwork after the expansion of the side wall block, are provided.

Advantages of the Invention

[0013] According to the present invention, it is possible to facilitate the construction and shorten the period of the repair work without being affected by the drying of the bottom plate or the influence of adjacent buildings in the repair of an existing fence channel.

Brief Description of the Drawings

[0014] [Figure 1] A longitudinal sectional view showing Step 1 of the embodiment. [Figure 2] A longitudinal sectional view showing Step 2 of the same. [Figure 3] A longitudinal sectional view showing Step 3 of the same. [Figure 4] A longitudinal sectional view showing Step 3 of the same. [Figure 5] A longitudinal sectional view showing Step 4 of the same. [Figure 6] A longitudinal sectional view showing Step 5 of the same. [Figure 7] A perspective view of the fence channel constituting the same water channel. [Figure 8] A perspective view showing another example of the fence channel. [Figure 9] A longitudinal sectional view showing the steps of the conventional repair method 1. [Figure 10] Vertical cross-sectional view showing the steps of Modification Method 2.

Mode for Carrying Out the Invention

[0015] Hereinafter, a method for modifying a grid channel according to an embodiment of the present invention will be described. Reference numeral 10 in FIG. 7 indicates a water channel such as an agricultural water channel (water channel / drainage channel). This water channel 10 is configured by providing a grid channel (grid channel block) 11 in the concave groove formed on the ground surface.

[0016] The grid channel 11 includes grid channel frames 15 that are vertically installed at equal intervals along the longitudinal direction on both sides of the concave groove, and grid channel plates 13 laminated between the front and rear grid channel frames 15. The side walls of the water channel 10 are constituted by the channel frames 15 and the group of grid channel plates 13, and the bottom surface of the grid channel 11 constitutes the bottom surface of the water channel 10.

[0017] The grid channel frames 15 and the grid channel plates 13 are made of concrete, and the height of the grid channel frames 15 is determined according to the depth of the water channel 10. The lower end portion 15a (see FIG. 1) of this grid channel frame 15 is buried in the bottom surface of the concave groove and is also called a grid pile / pile body.

[0018] On the other hand, the number of grid channel plates 13 laminated between the grid channel frames 15 is not limited to the number in FIG. 7 and is appropriately selected according to the height of the grid channel frames 15. A modification method when such an existing grid channel 11 is deteriorated will be described based on an example.

Example

[0019] An example of the modification method will be described based on FIGS. 1 to 6. Reference numeral 15 in each figure indicates an existing grid channel frame, and the left and right grid channel frames 15 are used as existing pile bodies. That is, the left and right grid channel frames 15 are spaced at equal intervals along the longitudinal direction on both sides of the grid channel 11 constituting the water channel 10, and the lower end portion 15a is buried. Grid channel plate groups are set on the left and right respectively to close the space between the front and rear grid channel frames 15.

[0020] Meanwhile, the upper ends of the left and right culvert frames 15 are connected to a support beam section 16, and a slab 17 is installed to bring the upper end surface of the culvert 11 to the ground surface. A slab 18 that closes the opening of the waterway 10 is installed between these slab 17.

[0021] In this embodiment, all of the drainage culverts 11 installed in the groove may be targeted for repair, or only a portion of the aging drainage culverts 11 may be targeted for repair. Here, the area between the drainage culvert frames 15 on the front, back, left, and right sides is considered one section to be repaired, and this section to be repaired is called the repair area, and the repair work is carried out in the order of steps 1 to 6.

[0022] (1) Process 1: Temporary installation and civil engineering preparation Figure 1 shows the state of the preliminary preparations for the aforementioned renovation work, namely the temporary installation and civil engineering preparations in step 1.

[0023] The temporary installation and civil engineering preparation work in Step 1 is carried out after removing the slab 18 shown in Figure 1 from the existing culvert 11. As part of the former work, temporary support beams 19 are attached between the culvert frames 15, and temporary earth retaining walls 20 are driven deeper than the existing piles (the lower end 15a of the culvert frames 15). As part of the latter work, mud G is removed from the bottom surface of the repaired area of ​​the culvert 11 (the bottom surface of the waterway 10).

[0024] (2) Process 2: Foundation installation Figure 2 shows the state in which a foundation is installed on the bottom surface of the area to be renovated of the culvert 11 during step 2 of the renovation work. In step 2, a permeable civil engineering sheet 21 is first laid on the bottom surface of the area to be renovated, then foundation crushed stone 22 is spread and leveled on top of the civil engineering sheet 21, and finally leveling concrete 23 is poured on top of the foundation crushed stone 22.

[0025] (3) Step 3: Installation of precast base slab Figure 3 shows the state in which the precast concrete blocks 25 of the base slab (hereinafter abbreviated as base slab blocks 25) have been installed in step 3 of the renovation work. Here, the base slab blocks 25 are precast products manufactured in advance at a factory or site yard for renovation purposes and are transported to the construction site during the renovation work.

[0026] Specifically, the base plate block 25 is formed in a roughly concave shape in cross-section and comprises a flat block body 25a and leg portions 25b extending upward from both ends of the block body 25a, with joints 28 embedded in the leg portions 25b.

[0027] Such base slab blocks 25 can be manufactured and installed according to the length of the bottom surface of the repaired area when the repaired section of the culvert 11 is short. On the other hand, when the repaired area of ​​the culvert is long, base slab blocks 25 can be manufactured according to the length of each section and installed for each section. However, the width of the base slab blocks 25 is formed to be approximately the same as the distance between the left and right culvert frames 15 in relation to the installation space.

[0028] Then, in step 3, the height adjustment plate 26 and the bedding mortar 27 are laid on the leveling concrete 23 in that order. After that, the base slab concrete 25 is set on the bedding mortar 27 using a crane or the like.

[0029] (4) Process 4: Concrete pouring (Phase 1) Figure 4 shows the state after the infill concrete has been poured in step 4 of the renovation work. That is, as described above, the base slab block 25 is formed to have a length in the width direction that is approximately the same as the distance between the left and right culvert frames 15, and a gap S (see Figure 3) is created between it and the group of culvert boards 13.

[0030] Therefore, as part of step 4, the base slab block 25 is expanded to the gap S by pouring infill concrete 30 into the gap S. At this time, the infill concrete 30 also flows into and forms the space between the fence frame 15 and the base slab block 25.

[0031] Furthermore, the infill concrete 30 is poured in the area from the leveling concrete 23 to the height of the leg portion 25b (the area L1 in Figure 4), and a watertight seal 39 is attached to the planes of both 25b and 30. Then, as step 4, after removing the temporary support beam 19, the reinforcing bars 31 are assembled in the height and longitudinal directions of the repaired area using the joint 28 embedded in the leg portion 25b.

[0032] (5) Process 5: Concrete pouring (second stage) Figure 5 shows the state in which, in step 5 of the renovation work, after the placement of the infill concrete 30, renovation side wall blocks 34 have been added to the inner circumference of the side wall (fence frame 15 and fence board 13 group) of the waterway 10.

[0033] In step 5, the first step is to assemble the formwork 33 in the area from the leg portion 25b to the support beam portion 16. Next, concrete is poured (including filling) between the formwork 33 and the side wall of the waterway 10 (fence frame 15 and fence plate 13 group), and the side wall block 34 is constructed in the area from the leg portion 25b and the infill concrete 30 to the support beam portion 16 (area L2 in Figure 5). Finally, after attaching the watertight seal 40 on the side wall block 34, the existing support beam portion 16 is removed.

[0034] (6) Process 6: Concrete pouring (3rd stage) Figure 6 shows the state in which the side wall block 34 has been extended to the planned height (L in Figure 6) in step 6 of the renovation work. Here, the supplementary block 34 that has been extended to height L is called the side wall block L.

[0035] The work in step 6 involves first assembling the reinforcement bars 41 on the upper side of the existing support beam section 16, that is, on the upper side of the side wall block 34. Next, the formwork 42 is assembled from the formwork 33 up to the height L (the area L3 in Figure 6).

[0036] Subsequently, concrete is poured (including filling) between the formwork 42 and the upper part of the side wall of the waterway 10 (upper part of the culvert frame 15, upper culvert board 13, and bulk stone body 17) to construct the expanded section 43 of the side wall block 34.

[0037] In other words, by constructing an extension 43 in the area L3 on the watertight seal 40, the side wall block 34 is extended to a height L, becoming a side wall block L. After the completion of this block L, the formwork 33 and 42 are removed, and a new precast slab (floor slab) 45 is installed between the bulk stone bodies 17 to complete the renovation work.

[0038] In this embodiment, after the precast base slab block 25 is installed in step 3, the side wall block L for renovation is added to the inside of the side wall of the waterway 10 through steps 4 and 5.

[0039] In this case, since the base slab block 25 is a precast product manufactured in advance at the factory or on-site yard for the renovation work, there is no need to wait for the base slab 4a to harden by drying before flowing water into the waterway 10, as in the renovation method shown in Figure 9, and the renovation work period can be shortened.

[0040] Furthermore, since the side wall block L is constructed inside the side wall (fence frame 15 and group of fence panels 13) of the existing waterway 10, it is not affected even if houses or other structures are built near the fence culvert 11, as shown in the renovation method in Figure 10, and offers a high degree of freedom in construction.

[0041] In particular, when constructing the side wall blocks 34 and extension section 43, it is possible to easily create lateral holes for existing drainage pipes in houses and other buildings, thereby simplifying construction. Furthermore, since the renovation is carried out while leaving the existing drainage culvert 11 in place, it also has the effect of reducing industrial waste.

[0042] It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with modifications within the scope of each claim. For example, it can be applied not only to the culvert 11 in Figures 1 to 7, but also to the culvert 50 in Figure 8.

[0043] This drainage channel 50 comprises drainage channel frames 15 arranged at equal intervals along the longitudinal direction on both sides of the groove, a base 51 connecting the bottoms of the drainage channel frames 15, and drainage channel plates 13 stacked between the front and rear drainage channel frames 15, with the base 51 installed on the bottom surface of the groove. In this case, by installing a bottom plate block 25 between the front and rear base 51, side wall blocks 34,L can be constructed inside the group of drainage channel plates 13. [Explanation of symbols]

[0044] 10…Waterway 11,51…fence culvert 13…Fence culvert board 15... Fence frame 16…Support part 25…Base block 30... Filling concrete 33, 42… formwork 34, L… Side wall block 43... Expansion section

Claims

1. A fence frame is arranged at equal intervals along the longitudinal direction on both sides of the waterway, A fence board is stacked between the front and rear fence frames, Equipped with, A method for repairing a culvert, wherein the culvert frame and the group of culvert boards constitute the side wall of the waterway, The first step involves installing pre-fabricated base slab blocks for renovation onto the bottom surface of the waterway, The second step involves constructing a repair side wall block on the inside of the side wall by pouring concrete onto both ends of the base plate block, A method for repairing a fence or culvert, characterized by having the following features.

2. The process further includes the step of pouring infill concrete between the base slab block and the side wall. The method for repairing a culvert according to feature 1.

3. The second step is, The process involves assembling formwork from both ends of the base slab block to a desired height, and then constructing the side wall block by pouring concrete between the formwork and the side wall. The method for repairing a culvert according to feature 1.

4. The second step is, If a support beam is installed between the upper ends of the fence frame positioned on both sides of the waterway, the process includes assembling formwork from both ends of the base block up to the height of the support beam, The process of constructing the side wall block by pouring concrete between the formwork and the side wall, The process involves removing the support beam section, assembling formwork on the side wall block, and then pouring concrete to extend the side wall block to the desired height. The process of removing each of the formwork after the expansion of the side wall block, A method for repairing a culvert according to claim 1, characterized by having the following:

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