How to repair a fence culvert

Abstract

The aim is to simplify construction and shorten the time required to renovate existing fence culverts without affecting neighboring buildings. [Solution] Existing support beams 16 are installed between the upper ends of the fence frame of the fence culvert 11, and a pre-fabricated base block with a roughly U-shaped cross section is installed on the bottom of the waterway at the bottom of the fence culvert 11. Formwork 33 is assembled from both ends of this base block to the support beams 16, and concrete is poured between the ends and the side wall of the waterway to add a side wall block 34 for renovation. The support beams 16 are then removed, and formwork 42 is assembled on the side wall block 34, after which concrete is poured to expand the side wall block 34 to the planned height L.

Description

[Technical Field]

[0001] The present invention relates to a method for improving (repairing or repairing) an existing fence culvert that constitutes a waterway. [Background technology]

[0002] One known method for constructing waterways such as agricultural irrigation channels (irrigation channels and drainage channels) is the method using a fence culvert, as described in Patent Document 1. For example, fence culvert frames are installed at equal intervals along the length of a groove dug for the waterway on both sides, and multiple fence culvert plates are stacked between the front and rear fence culvert frames to form the side walls of the waterway.

[0003] However, in recent years, the deterioration of existing fences and culverts has become a problem, and in particular when the walls of the fences and culverts (groups of fence and culvert boards) are leaning over, they can cause accidents and require immediate repairs. As repair methods for such cases, repair methods 1 and 2 shown in Figures 9 and 10 have been proposed.

[0004] Renovation method 1 in Figure 9 aims to renovate the fence culvert 1 by pouring a concrete structure 4 and filler concrete 5 inside the group of fence culvert plates 3. Renovation method 2 in Figure 10 involves installing steel sheet piles 2 as retaining walls on the outside of the existing renovation target, and constructing a new waterway while demolishing the existing fence culvert 1. Note that while box culvert 1a is the target of renovation in Figure 10, it is also possible to use this to renovate a fence culvert. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2003-64638 Summary of the Invention [Problem to be solved by the invention]

[0006] However, according to the renovation method 1 in Figure 9, since the base slab 4a is made of cast-in-place concrete, water cannot flow into the waterway until the base slab 4a dries and hardens, which means that construction takes time and there is a risk that the renovation work will be prolonged.

[0007] Furthermore, in the repair method of Figure 10, if there are buildings such as houses near the culvert to be repaired, it may not be possible to drive the steel sheet piles 2. In this case, even if the steel sheet piles 2 are installed using a special construction method, since there are numerous existing drainage pipes from the houses, etc., horizontal holes must be formed in the newly constructed culvert to pass the drainage pipes through, which may make the construction difficult.

[0008] The present invention was made to solve these conventional problems, and aims to simplify the construction and shorten the time required for repair work on existing fence culverts without causing the bottom slab to dry out or being affected by neighboring buildings. [Means for solving the problem]

[0009] (1) The present invention comprises: fence culvert frames arranged on both sides of a waterway at equal intervals along the longitudinal direction; Fence and culvert plates stacked between the front and rear fence and culvert frames; Equipped with A method for repairing a culvert that forms a side wall of the waterway using the culvert frame and the culvert plate group, A first step of installing a prefabricated bottom slab block for repair on the bottom of the waterway; and a second step of constructing a side wall block for renovation inside the side wall by pouring concrete onto both ends of the base block.

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

[0011] (3) One embodiment of the second step is This method is characterized by including a process of assembling formwork from both ends of the base block to the desired height, and then constructing the side wall blocks by pouring concrete between the formwork and the side walls.

[0012] (4) Another embodiment of the second step is When a support beam is installed between the upper ends of the fence culvert frames arranged on both sides of the waterway, assembling formwork from both ends of the bottom slab block to the height of the support beam; constructing the side wall blocks by pouring concrete between the formwork and the side walls; a step of removing the support beams, assembling a form on the side wall blocks, and then pouring concrete to expand the side wall blocks to a desired height; and removing the formwork after the side wall blocks are expanded. [Effects of the Invention]

[0013] According to the present invention, the repair of an existing fence culvert can be carried out easily and the repair work period can be shortened without the drying of the bottom slab or being affected by neighboring buildings. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a longitudinal cross-sectional view showing step 1 of the embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a longitudinal cross-sectional view showing step 4 of the same method. [Figure 6] FIG. 10 is a longitudinal cross-sectional view showing step 5 of the same method. [Figure 7] An oblique view of the fence culvert that makes up the waterway. [Figure 8] FIG. 10 is a perspective view showing another example of a fence culvert. [Figure 9] A longitudinal cross-sectional view showing the steps of conventional repair method 1. [Figure 10] A longitudinal cross-sectional view showing the process of the same renovation method 2. DETAILED DESCRIPTION OF THE INVENTION

[0015] A method for repairing a fence culvert according to an embodiment of the present invention will be described below. Reference numeral 10 in Fig. 7 indicates a waterway such as an agricultural waterway (irrigation channel / drainage channel). This waterway 10 is constructed by providing a fence culvert (fence culvert blocks) 11 in the recessed groove formed on the ground surface.

[0016] The fence culvert 11 comprises fence culvert frames 15 installed vertically at equal intervals along the longitudinal direction on both sides of the groove, and fence culvert plates 13 stacked between the front and rear fence culvert frames 15. The culvert frames 15 and the group of fence culvert plates 13 form the side walls of the waterway 10, and the bottom surface of the fence culvert 11 forms the bottom surface of the waterway 10.

[0017] The fence frame 15 and the fence plate 13 are made of concrete, and the height of the fence frame 15 is determined according to the depth of the waterway 10. The fence frame 15 has its lower end 15a (see Figure 1) buried in the bottom of the groove, and is also called a fence pile / pile body.

[0018] On the other hand, the number of palisade culvert plates 13 stacked between the palisade culvert frames 15 is not limited to the number shown in Fig. 7, but is appropriately selected depending on the height of the palisade culvert frames 15. A repair method for such an existing palisade culvert 11 when it has deteriorated will be described based on an embodiment. [Example]

[0019] An example of the repair method will be described with reference to Figures 1 to 6. In each figure, 15 indicates an existing fence frame, and the left and right fence frames 15 are used as existing pile bodies. That is, the left and right fence frames 15 are separated at equal intervals along the longitudinal direction on both sides of the fence 11 that constitutes the waterway 10, with their lower ends 15a buried. Groups of fence plates 13 are set on the left and right to block the space between the front and rear fence frames 15.

[0020] Meanwhile, the upper ends of the left and right fence culvert frames 15 are connected to support beams 16, and bulkheads 17 are installed to make the upper end surface of the fence culvert 11 flush with the ground surface. A slab (floor slab) 18 is installed between these bulkheads 17 to close the opening of the waterway 10.

[0021] In this embodiment, all of the fence culverts 11 installed in the recessed trench may be subject to repair, or only a portion of the aging fence culverts 11 may be subject to repair. Here, the area between the front, rear, left, and right fence culvert frames 15 is considered to be one section to be repaired, and the section to be repaired is called the repair range, 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 preliminary preparations for the renovation work, i.e., the state of 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 in Figure 1 from the existing fence culvert 11. The former work involves attaching temporary support beams 19 between the fence culvert frames 15, and driving temporary earth retaining walls 20 deeper than the existing pile bodies (the lower ends 15a of the fence culvert frames 15). The latter work involves removing mud G from the bottom of the area of ​​the fence culvert 11 that needs to be repaired (the bottom of the waterway 10).

[0024] (2) Process 2: Foundation installation Figure 2 shows the state of installing a foundation on the bottom of the repair area of ​​the fence culvert 11 in step 2 of the repair work. The work in step 2 involves first laying a permeable civil engineering sheet 21 on the bottom of the repair area, then spreading and leveling foundation crushed stone 22 on top of the civil engineering sheet 21, and finally pouring leveling concrete 23 on the foundation crushed stone 22.

[0025] (3) Step 3: Installation of precast base slab Figure 3 shows the state in which a precast concrete base block 25 (hereinafter referred to as base block 25) has been installed in step 3 of the renovation work. Here, the base block 25 is a precast product that has been fabricated in advance in a factory or on-site yard for renovation use, and is transported to the construction site during the renovation work.

[0026] Specifically, the bottom plate block 25 has a cross section that is approximately concave, and comprises a flat block body 25a and legs 25b extending upward from both ends of the block body 25a, with joints 28 embedded in the legs 25b.

[0027] If the repair section of the fence culvert 11 is short, such a base block 25 can be manufactured and installed according to the length of the bottom surface of the repair area. On the other hand, if the repair area of ​​the fence culvert is long, a base block 25 according to the length of each section can be manufactured and installed for each section. However, the width of the base block 25 is formed to be approximately equal to the distance between the left and right fence culvert frames 15 due to the installation space.

[0028] In step 3, the height adjusting plate 26 and the spreader mortar 27 are laid in this order on the leveling concrete 23. Thereafter, the base concrete 25 is installed on the spreader mortar 27 using a crane or the like.

[0029] (4) Step 4: Pouring concrete (first stage) Figure 4 shows the state after filling concrete has been poured in step 4 of the renovation work. That is, as mentioned above, the base slab block 25 is formed so that its width is approximately the same as the distance between the left and right palisade culvert frames 15, and a gap S (see Figure 3) is created between the palisade culvert boards 13.

[0030] Therefore, in step 4, filler concrete 30 is poured into the gap S to expand the base block 25 up to the gap S. At this time, the filler concrete 30 also flows into the gap between the slab frame 15 and the base block 25 to build it up.

[0031] Furthermore, filler concrete 30 is poured in the range from the leveling concrete 23 to the height of the leg 25b (range L1 in FIG. 4), and waterproof seals 39 are attached to the flat surfaces of both 25b and 30. Then, in step 4, the temporary support beams 19 are removed, and then reinforcing bars 31 are assembled in the height and length directions of the repair area using joints 28 embedded in the leg 25b.

[0032] (5) Step 5: Pouring concrete (second stage) Figure 5 shows the state in step 5 of the renovation work where, after pouring the filler concrete 30, renovation side wall blocks 34 have been added to the inner periphery of the side wall (group of fence and culvert frames 15 and fence and culvert boards 13) of the waterway 10.

[0033] In step 5, first, formwork 33 is assembled in the area from leg 25b to support beam 16. Next, concrete is poured (including filling) between formwork 33 and the side wall of waterway 10 (group of palisade culvert frame 15 and palisade culvert boards 13), and side wall blocks 34 are constructed in the area from leg 25b and fill concrete 30 to support beam 16 (range L2 in Figure 5). Finally, waterproof seals 40 are attached to side wall blocks 34, and then the existing support beam 16 is removed.

[0034] (6) Step 6: Pouring concrete (third stage) Figure 6 shows the state in which the side wall block 34 has been expanded to the planned height (L in Figure 6) in step 6 of the renovation work. Here, the complementary block 34 expanded to height L is referred to as side wall block L.

[0035] In step 6, first, the distribution reinforcement 41 is assembled above the location of the existing support beam 16, i.e., above the side wall block 34. Next, the formwork 42 is assembled in the range from the top of the formwork 33 to the height L (the range of L3 in Figure 6).

[0036] Thereafter, concrete is poured (including filling) between the formwork 42 and the upper part of the side wall of the waterway 10 (the upper part of the fence frame 15, the upper fence plate 13, and the bulkhead 17) to construct the extension part 43 of the side wall block 34.

[0037] That is, by constructing an extension section 43 in the range of L3 on the waterproof seal 40, the side wall block 34 is extended to a height L to form the side wall block L. After this block L is completed, the formwork 33, 42 is removed and a new precast slab (floor slab) 45 is installed between the bulkheads 17 to complete the renovation work.

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

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

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

[0041] In particular, horizontal holes for existing drainage pipes of houses, etc. can be easily formed when constructing the side wall blocks 34 and extension sections 43, which facilitates construction. Furthermore, the existing fence culvert 11 can be left in place during the renovation, which also has the effect of reducing industrial waste.

[0042] The present invention is not limited to the above-described embodiment, and can be modified and implemented within the scope of the claims. For example, the present invention can be applied not only to the fence culvert 11 shown in Figures 1 to 7, but also to the fence culvert 50 shown in Figure 8.

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

[0044] 10...Waterway 11,51…fence culvert 13…Fence culvert board 15...Fence and culvert frame 16…Support part 25...Bottom block 30...filled concrete 33,42...Formwork 34,L...Side wall block 43...Extension

Claims

1. Fence culvert frames are arranged on both sides of the waterway at equal intervals along the longitudinal direction; Fence and culvert plates stacked between the front and rear fence and culvert frames; Equipped with A method for repairing a culvert that forms a side wall of the waterway using the culvert frame and the culvert plate group, A first step of installing a prefabricated bottom slab block for repair on the bottom of the waterway; a second step of constructing side wall blocks for renovation inside the side walls by pouring concrete onto both ends of the base block; A method for repairing a fence culvert, comprising:

2. Further comprising a step of pouring filler concrete between the bottom slab block and the side wall.

2. The method for repairing a fence culvert according to claim 1.

3. The second step comprises: and assembling formwork from both ends of the base block to a desired height, and then constructing the side wall blocks by pouring concrete between the formwork and the side walls.

2. The method for repairing a fence culvert according to claim 1.

4. The second step comprises: When a support beam is installed between the upper ends of the fence culvert frames arranged on both sides of the waterway, assembling formwork from both ends of the bottom slab block to the height of the support beam; constructing the side wall blocks by pouring concrete between the formwork and the side walls; a step of removing the support beams, assembling a form on the side wall blocks, and then pouring concrete to expand the side wall blocks to a desired height; removing the formwork after the side wall blocks are expanded; 2. The method for repairing a fence culvert according to claim 1, further comprising:

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