Silt basin and installation method for silt basin

Abstract

To provide a silt basin and an installation method for the silt basin capable of suppressing overflow of rainwater and the like from a catch basin installed on a road during, for example, the occurrence of concentrated torrential rainfall.SOLUTION: A silt basin 1 can be installed on a first bottom wall part 3a of a catch basin 2 which has a catch basin body 10, a basin cover 6 attached to an upper opening of the catch basin body 10 and having an opening part 6d capable of allowing drainage from the road surface to flow into the catch basin body 10, and a drain pipe part 5 connected to the first bottom wall part 3a and allowing the drainage that has flowed into the catch basin body 10 to flow out to the outside of the catch basin body 10. The silt basin 1 comprises a silt basin body 11 having a debris accumulation part 14 for accumulating foreign matter contained in the drainage, and a leg part 12 provided to protrude downward from the bottom surface of the silt basin body 11. The leg part 12 is configured to be adjustable in a protrusion amount downward from the bottom surface of the silt basin body 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a silt basin and a method for installing the silt basin. [Background technology]

[0002] Conventionally, drainage outlets (e.g., catchment basins) for draining rainwater and the like from roads such as expressways have been installed on the shoulders of the roads. For example, a grating is fitted into the upper opening of the drainage outlet, and rainwater and the like from the road surface is allowed to flow into the drainage outlet through the opening of the grating. In addition, the upstream end of a drainage pipe is connected to the bottom wall of the drainage outlet, and the rainwater and the like that flows into the drainage outlet is allowed to flow out through the drainage pipe. For example, in Patent Document 1, an impurity separation tank is placed on the bottom wall of the drainage outlet. Then, impurities such as soil and sand contained in the rainwater are separated from the rainwater in the impurity separation tank. As a result, the rainwater from which impurities have been removed is allowed to flow into the drainage pipe, making it possible to prevent the drainage pipe from being clogged by impurities. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-40754 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when an impurity separation tank (silt pit) as in Patent Document 1 is installed on the bottom wall of a catchment pit, the silt pit can obstruct the flow of rainwater, etc., into a drainage pipe connected to the bottom wall of the catchment pit. This can cause the rainwater, etc., to overflow from the catchment pit when the amount of rainwater, etc., flowing into the catchment pit from the road surface increases, for example, during heavy rainfall.

[0005] The present invention has been made in consideration of these points, and its object is to provide a silt manhole and a method for installing a silt manhole that can prevent rainwater and the like from overflowing from drainage manholes installed on roads during, for example, heavy rainfall. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides a silt basin that can be installed on the bottom wall of a drainage basin which has a drainage basin main body, a lid portion that is attached to the upper opening of the drainage basin main body and has an opening that allows drainage water from the road surface to flow into the drainage basin main body, and a drainage pipe portion that is connected to the bottom wall of the drainage basin main body and allows the drainage water that has flowed into the drainage basin main body to flow out of the drainage basin main body, and is characterized in that it comprises a silt basin main body having a foreign matter collection portion for collecting foreign matter contained in the drainage water, and legs that are arranged to protrude downward from the bottom surface of the silt basin main body, and the legs are configured to be able to adjust the amount of downward protrusion from the bottom surface. According to the present invention configured in this way, by increasing the downward projection of the legs from the bottom surface of the silt sump body, it is possible to increase the vertical gap between the silt sump body and the bottom wall of the drainage sump body. This increases the cross-sectional area of ​​the flow path between the silt sump body and the bottom wall of the drainage sump body, thereby increasing the amount of rainwater, etc. flowing out from the drainage sump body to the drain pipe connected to the bottom wall. Therefore, for example, it is possible to prevent rainwater, etc. from overflowing from the drainage sump during heavy rain.

[0007] In the present invention, the leg portion preferably has a bolt extending in the vertical direction and having a male thread portion on its outer surface, and a nut having a female thread portion that screws into the male thread portion. According to the present invention configured in this manner, the amount of downward protrusion of the bolt from the bottom surface of the silt tank body can be adjusted by utilizing the forward or backward screwing movement of the male and female screw portions.

[0008] In the present invention, the bolt and the nut are preferably made of a resin material. According to the present invention configured in this manner, it is possible to prevent the bolts and nuts from rusting due to rainwater or the like.

[0009] In the present invention, it is preferable that a nut pocket is provided on the bottom wall of the silt trap body so as to protrude downward from the bottom surface, and the nut pocket is configured to regulate the rotation of the nut when the nut is accommodated therein, and a through hole through which the bolt can be inserted is provided at a position corresponding to the nut pocket on the bottom wall of the silt trap body. According to the present invention configured in this manner, when the nut is housed in the nut pocket, the nut is restricted in rotation by the nut pocket, so that, for example, an operator can advance or retract the screw mechanism formed by the bolt and nut by simply pinching the upper part of the bolt protruding upward from the insertion hole in the bottom wall of the silt catch basin body and rotating the bolt. As a result, for example, when the silt catch basin is installed on the bottom wall of the drainage basin body, an operator can adjust the amount of the bolt protruding downward from the bottom surface of the silt catch basin body by simply pinching the upper part of the bolt and rotating the bolt.

[0010] In the present invention, it is preferable that the silt manhole main body is provided with an accommodation section that accommodates a locking mechanism that can switch between a state in which the lid portion is fixed to the drainage manhole main body and a state in which it is not fixed, and a drainage hole portion that penetrates in the vertical direction is provided in the portion of the bottom wall of the silt manhole main body that corresponds to the accommodation section, and the nut pocket is provided in the portion of the bottom wall of the silt manhole main body that corresponds to the foreign matter accumulation portion. According to the present invention configured as described above, by providing a nut pocket on the bottom surface of the foreign matter storage section, it is possible to increase the opening area of ​​the drain hole section compared to when the nut pocket is provided on the bottom surface of the storage section, thereby ensuring the drainage capacity to the drain pipe section located below the silt basin body.

[0011] In the present invention, it is preferable that a mesh member is attached to the drainage hole portion. According to the present invention configured in this manner, dead leaves and the like contained in rainwater and the like are collected by the mesh member, thereby making it possible to prevent the drain pipe from being clogged with dead leaves and the like.

[0012] In the present invention, preferably, the method for installing a silt box is characterized by having a removal process for removing a silt box other than the silt box from the drainage box, a setting process for setting the silt box on the bottom wall of the drainage box body after the removal process, and an adjustment process for adjusting the height of the silt box in accordance with the depth of the drainage box at least either before or after the setting process. According to the present invention thus configured, for example, after removing another silt bin from a catchment bin that has overflowed with rainwater or the like during a torrential downpour, a silt bin is installed on the bottom wall of the catchment bin body. At that time, for example, it is possible to adjust the height of the silt bin so that it is maximized within a range in which the silt bin does not protrude from the catchment bin. This makes it possible to adjust the height of the silt bin body so that the cross-sectional area of ​​the flow path between the silt bin body and the bottom wall of the catchment bin body is maximized according to the depth of the catchment bin, so that it is possible to prevent rainwater or the like from overflowing from the catchment bin during the next torrential downpour. Effect of the Invention

[0013] For example, it is possible to provide a silt pit and a method for installing a silt pit that can prevent rainwater and the like from overflowing from drainage pits installed on roads during heavy rainfall. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a plan view showing a catch basin including a silt basin according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a plan view showing a silt basin according to an embodiment of the present invention. [Diagram 5]FIG. 5 is a view taken along the arrow V in FIG. 4. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] 2 is a flowchart showing a method (installation procedure) for installing a silt basin according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: It should be noted that the following description of the preferred embodiments is merely exemplary in nature.

[0016] FIG. 1 shows a catchment 2 including a silt catchment 1 according to an embodiment of the present invention. The catchment 2 is buried in the shoulder of a road (e.g., an expressway, a bridge) not shown, and is used to drain rainwater and the like from the road surface. As shown in FIG. 2, the catchment 2 includes a lower catchment 3, an upper catchment 4, a drainage pipe section 5, and a catchment lid 6. In this embodiment, the lower catchment 3 and the upper catchment 4 form a catchment main body 10. For ease of explanation, the silt catchment 1 and the catchment lid 6 in FIG. 2 are shown in the direction of arrow A in FIG. 1.

[0017] The lower manhole 3 has a substantially U-shaped cross section that opens upward. The lower manhole 3 includes a first bottom wall portion 3a extending horizontally, a first side wall portion 3b extending upward from the outer peripheral end of the first bottom wall portion 3a, a lower flange portion 3c extending substantially horizontally outward from a part of the upper end of the first side wall portion 3b, a drainage hole 3d formed penetrating the first bottom wall portion 3a in the vertical direction, and a lower bolt hole 3e formed penetrating the lower flange portion 3c in the vertical direction. One end (upstream end) of the drainage pipe portion 5 extending substantially vertically is connected to the drainage hole 3d. The other end (downstream end) of the drainage pipe portion 5 is connected to a drainage channel (not shown), and can be drained from the drainage channel to a river or a sewer system. This allows rainwater and the like on the road surface that flows into the drainage manhole 2 to be properly drained into a river or the like through the drainage pipe portion 5.

[0018] The upper manhole 4 has a generally rectangular frame shape in plan view (see FIG. 1). The upper manhole 4 also has a skirt portion 4a extending downward from the inner peripheral end of the upper manhole 4. The skirt portion 4a is adapted to be inserted into the first side wall portion 3b of the lower manhole 3. The upper manhole 4 also has an upper flange portion 4b extending generally horizontally outward from a portion of the upper end of the skirt portion 4a, upper bolt holes 4c formed penetrating the upper flange portion 4b in the vertical direction, and a step portion 4d provided on the upper portion of the skirt portion 4a.

[0019] An adjustment liner 7 is interposed between the lower flange portion 3c and the upper flange portion 4b in the vertical direction. A notch 7a is provided in the adjustment liner 7. Fixing bolts 8 are inserted into the notch 7a, the lower bolt hole 3e, and the upper bolt hole 4c, thereby fixing the lower manhole 3 and the upper manhole 4 together.

[0020] A manhole cover 6 is attached from above to the step 4d of the upper manhole 4. As shown in Fig. 1, the manhole cover 6 includes a substantially rectangular frame 6a and a plurality of plate-like members 6b that extend horizontally and have their ends fixed to the inner peripheral surface of the frame 6a.

[0021] In addition, the manhole cover 6 has a frame portion 6a and multiple plate-shaped members 6b arranged at a predetermined interval from each other, so that openings 6d are formed between the frame portion 6a and the plate-shaped members 6b, and between adjacent plate-shaped members 6b, allowing rainwater, etc. to flow from the road surface into the drainage manhole 2.

[0022] Furthermore, the manhole cover 6 is provided with a locking mechanism 9. The locking mechanism 9 is attached to the lower end of a part of the plate-like members 6b located on the inside among the multiple plate-like members 6b (see FIG. 2). The locking mechanism 9 also includes a pair of slide arms 9a and a turning mechanism 9c having a keyhole 9b. The locking mechanism 9 is capable of converting the rotational motion of a tool (not shown) into linear motion of the slide arm 9a by rotating the tool with a key (not shown) of the tool inserted into the keyhole 9b.

[0023] When the tool is rotated to one side with the key inserted in the keyhole 9b to place the slide arm 9a in the locked position shown in Fig. 3, a part of the slide arm 9a overlaps with the skirt portion 4a in a plan view (they overlap in the vertical direction), creating a locked state. In this locked state, when the manhole cover 6 tries to move upward, the slide arm 9a abuts against the lower end of the skirt portion 4a. This restricts the upward movement of the manhole cover 6, preventing the manhole cover 6 from jumping up.

[0024] On the other hand, when the key is inserted into the keyhole 9b and the tool is rotated to the other side to place the slide arm 9a in an unlocked position (not shown), a part of the slide arm 9a does not overlap with the skirt portion 4a in a plan view (they do not overlap in the vertical direction), resulting in an unlocked state. In this unlocked state, even if the manhole cover 6 attempts to move upward, the slide arm 9a does not come into contact with the lower end of the skirt portion 4a. Therefore, the upward movement of the manhole cover 6 is not restricted by the skirt portion 4a, and the manhole cover 6 can be removed from the step portion 4d of the upper manhole 4. For ease of explanation, the silt manhole 1 and manhole cover 6 in FIG. 3 are shown in the direction of arrow B in FIG. 1.

[0025] In addition, a silt pit 1 for receiving foreign matter (e.g., soil, sand, dead leaves, etc.) contained in rainwater is disposed between the first bottom wall portion 3a of the lower pit 3 and the pit lid 6 in the vertical direction. In this embodiment, the silt pit 1 is placed inside the catchment pit 2 by being placed on the first bottom wall portion 3a.

[0026] The silt basin 1 comprises a silt basin body 11 made of steel (e.g., carbon steel such as SPCC) and legs 12 provided at the bottom of the silt basin body 11 and made of resin (e.g., fiber-reinforced plastic). In this embodiment, the silt basin body 11 is plated (e.g., zinc-plated) to prevent rust.

[0027] As shown in Fig. 4, the silt basin body 11 has a substantially rectangular shape in plan view. The silt basin body 11 also includes a second bottom wall portion 11a extending horizontally and having a substantially rectangular plate shape, and a second side wall portion 11b extending upward from the outer end portion of the second bottom wall portion 11a. Furthermore, a storage portion 13 for storing the locking mechanism 9 is provided in the central region of the silt basin body 11 in the longitudinal direction in plan view (see Fig. 4).

[0028] The second bottom wall 11a has a drain hole 11c formed through the top and bottom direction at a portion corresponding to the storage section 13. The drain hole 11c has a substantially rectangular hole shape. A mesh member 13a (e.g., expanded metal) is attached to the drain hole 11c from above. This allows the mesh member 13a to collect foreign matter (e.g., dead leaves) contained in the rainwater, etc., when the rainwater, etc., that flows into the drainage basin 2 from the opening 6d is drained downward through the drain hole 11c to the silt basin main body 11. This prevents foreign matter contained in the rainwater, etc., that flows downward through the drain hole 11c to the silt basin main body 11 from flowing into the drain pipe 5 and clogging the drain pipe 5. The second side wall 11b has a cutout 11d at a portion corresponding to the storage section 13 to prevent interference with the slide arm 9a (see FIG. 5). In addition, the cutout 11d has the function of draining rainwater and the like from the road surface that flows into the storage section 13 downward to the bottom of the silt trap main body 11.

[0029] Foreign matter collecting sections 14 are provided on both longitudinal sides of the storage section 13 in the silt basin body 11. Between the storage section 13 and the foreign matter collecting section 14, partition wall sections 15 are provided, each extending in the vertical direction.

[0030] The foreign matter reservoir 14 has a bottom, that is, a cross-sectional shape is substantially U-shaped. As a result, when rainwater from the road surface that flows into the catch basin 2 from the opening 6d enters the foreign matter reservoir 14, the relatively heavy soil and sand (foreign matter) contained in the rainwater and the like accumulates at the bottom of the foreign matter reservoir 14. This makes it possible to prevent the soil and sand (foreign matter) contained in the rainwater and the like from flowing into the drain pipe 5 and clogging the drain pipe 5.

[0031] First through-holes 11e that penetrate in the vertical direction are provided in a portion of the second bottom wall portion 11a that corresponds to the foreign matter reservoir 14 (see FIG. 6). In this embodiment, four first through-holes 11e are provided, and each of the first through-holes 11e is provided near one of the four corners of the second bottom wall portion 11a in a plan view.

[0032] In addition, a nut pocket 16 is provided on the bottom surface of the portion of the second bottom wall portion 11a corresponding to each of the first through-hole portions 11e (foreign matter reservoir portion 14) so ​​as to protrude downward from the bottom surface (see FIG. 5). The nut pocket 16 is substantially U-shaped and opens upward, and includes a third bottom wall portion 16a and a third side wall portion 16b extending upward from each end of the third bottom wall portion 16a. In addition, a second through-hole portion 16c penetrating in the vertical direction is provided on the third bottom wall portion 16a of the nut pocket 16, and is provided so that the position of the second through-hole portion 16c and the position of the first through-hole portion 11e approximately coincide with each other in a plan view. In other words, the first through-hole portion 11e is provided at a position corresponding to the nut pocket 16 in the second bottom wall portion 11a. Furthermore, the upper end of each third side wall portion 16b is fixed to the bottom surface of the second bottom wall portion 11a by, for example, welding.

[0033] The number of legs 12 provided is the same as the number of nut pockets 16 (four in this embodiment). Each leg 12 is provided with a bolt 17 and a nut 18, as shown in FIG.

[0034] The bolt 17 has a head 17a and a shaft 17b, and a screw thread 17c is provided on the outer surface of the shaft 17b. When the silt pit 1 is placed on the first bottom wall 3a of the drainage pit 2, the head 17a is located within the foreign matter reservoir 14 of the silt pit main body 11, and the shaft 17b protrudes downward from the second bottom wall 11a with its lower end contacting the upper surface of the first bottom wall 3a.

[0035] The nut 18 is, for example, a hexagonal nut, and its diagonal distance is slightly shorter than the distance between the third side wall portions 16b of the nut pocket 16. As a result, when the nut 18 is set (housed) in the nut pocket 16 and the nut 18 tries to rotate around the central axis, the outer peripheral surface of the nut 18 and the inner surfaces of both third side wall portions 16b interfere with each other, so that the nut 18 is restricted from rotating around the central axis. In other words, the nut pocket 16 has a function as a rotation restricting member for the nut 18, and is configured to restrict the rotation of the nut 18 when the nut 18 is set (housed).

[0036] The nut 18 is provided with a screw hole 18a that can be screwed into the screw thread portion 17c of the bolt 17. That is, the screw thread portion 17c of the bolt 17 and the screw hole portion 18a of the nut 18 form a screw mechanism. In this embodiment, the screw mechanism is configured to be able to adjust the amount of downward projection of the bolt 17 from the bottom surface of the second bottom wall portion 11a by performing forward and backward screwing motions, that is, to adjust the height (length in the gravity direction) of the silt basin 1.

[0037] Then, when the bolt 17 is rotated to one side with the nut 18 set in the nut pocket 16, the bolt 17 moves downward relative to the silt basin body 11 and the nut 18. In other words, the height of the silt basin 1 increases as the amount of the bolt 17 protruding downward from the bottom surface of the second bottom wall portion 11a increases.

[0038] On the other hand, when the bolt 17 is rotated to the other side with the nut 18 set in the nut pocket 16, the bolt 17 moves upward relative to the silt basin body 11 and the nut 18. In other words, the amount of downward protrusion of the bolt 17 from the bottom surface of the second bottom wall portion 11a becomes smaller, and the height of the silt basin 1 becomes lower.

[0039] Here, the depth of the catchment basin 2 is not constant, and the depth varies depending on, for example, the drainage capacity required for the catchment basin 2. Therefore, even on the same road (for example, a highway), the depth of the catchment basin 2 may vary depending on the installation location. In this embodiment, the height of the silt basin 1 (the amount of protrusion of the legs 12) can be adjusted depending on the depth of the catchment basin 2, so that the height of the silt basin 1 can be maximized according to the depth of the catchment basin 2, which differs depending on the installation location. This makes it possible to maximize the flow path cross-sectional area between the silt basin main body 11 and the first bottom wall portion 3a depending on the depth of the catchment basin 2.

[0040] Next, a method (procedure) for installing the silt pit 1 according to this embodiment will be described with reference to Fig. 7. In this embodiment, the silt pit 1 is installed in a drainage pit 2 that has overflowed with rainwater during heavy rain, for example.

[0041] In step S1, an operator uses a tool (not shown) to change the locking mechanism 9 of the manhole cover 6 from a locked state to an unlocked state.

[0042] In step S2, the worker removes the manhole cover 6 from the upper manhole 4.

[0043] In step S3 (removal process), an operator removes another silt pit (not shown) different from the silt pit 1 according to this embodiment from the drainage pit 2. The other silt pit is different from the silt pit 1 according to this embodiment, and the height of the other silt pit cannot be adjusted like the impurity separation tank of Patent Document 1, for example.

[0044] In step S4 (setting process), an operator sets the silt box 1 in the catchment bin 2. More specifically, the operator places (installs) the silt box 1 on the first bottom wall portion 3a of the catchment bin 2 so that the lower ends of the bolts 17 (legs 12) are in a position in contact with the upper surface of the first bottom wall portion 3a of the catchment bin 2.

[0045] In step S5 (adjustment step), the worker adjusts the height of the silt bin 1 according to the depth of the catchment bin 2. More specifically, with the silt bin 1 set on the first bottom wall portion 3a, the worker pinches the head 17a and rotates the bolt 17. At this time, since the threaded portion 17c of the bolt 17 is screwed into the screw hole portion 18a of the nut 18 set in the nut pocket 16, it is possible to adjust the amount of the bolt 17 protruding downward from the second bottom wall portion 11a simply by rotating the bolt 17. For example, the worker can look into the catchment bin 2 from above and rotate the bolt 17 (adjust the height of the silt bin 1) while visually checking the height of the silt bin 1 relative to the depth of the catchment bin 2. This makes it possible to maximize the height of the silt pit 1 within a range in which it does not protrude from the drainage pit 2 to the silt pit 1, or within a range in which the pit lid 6 does not interfere with the silt pit 1 when the pit lid 6 is attached to the upper pit 4. This makes it possible to relatively increase the vertical gap between the second bottom wall portion 11a of the silt pit main body 11 and the first bottom wall portion 3a of the lower pit 3, i.e., the flow path cross-sectional area between the silt pit main body 11 and the first bottom wall portion 3a, thereby ensuring sufficient drainage capacity to the drain pipe section 5.

[0046] In step S6, an operator attaches the manhole cover 6 to the step portion 4d of the upper manhole 4.

[0047] In step S7, the worker uses a tool (not shown) to change the locking mechanism 9 of the manhole cover 6 from an unlocked state to a locked state, thereby completing the installation of the silt manhole 1 in the catchment manhole 2. If there are multiple catchment manholes 2 on the road that have overflowed with rainwater or the like, a silt manhole 1 is installed at each location according to the procedure shown in Fig. 7.

[0048] As described above, according to this embodiment, by increasing the amount of downward projection of the legs 12 from the bottom surface of the silt sump main body 11, it is possible to increase the vertical gap between the silt sump main body 11 and the bottom wall of the drainage sump main body 10. This increases the flow path cross-sectional area between the silt sump main body 11 and the first bottom wall portion 3a, making it possible to increase the amount of rainwater, etc., that flows out from within the drainage sump main body 10 to the drain pipe portion 5 connected to the first bottom wall portion 3a. Therefore, for example, it is possible to prevent rainwater, etc., from overflowing from the drainage sump 2 during the occurrence of heavy rain.

[0049] In addition, the amount of downward protrusion of the bolt 17 from the bottom surface of the silt tank body 11 can be adjusted by utilizing the forward or backward screwing movement of the screw thread portion 17c and the screw hole portion 18a.

[0050] In addition, the bolts 17 and nuts 18 can be prevented from rusting due to rainwater or the like.

[0051] Furthermore, when the nut 18 is housed in the nut pocket 16, the nut 18 is restricted from rotating by the nut pocket 16, so that, for example, an operator can advance or retract the screw mechanism formed by the bolt 17 and the nut 18 by simply pinching the upper portion of the bolt 17 protruding upward from the first through-hole portion 11e of the second bottom wall portion 11a and rotating the bolt 17. As a result, for example, when the silt basin 1 is installed on the first bottom wall portion 3a, an operator can adjust the amount of the bolt 17 protruding downward from the bottom surface of the silt basin main body 11 by simply pinching the upper portion of the bolt 17 and rotating the bolt 17.

[0052] In addition, by providing the nut pocket 16 on the bottom surface of the foreign matter storage section 14, it is possible to increase the opening area of ​​the drain hole section 11c compared to the case where the nut pocket 16 is provided on the bottom surface of the storage section 13. This ensures the drainage capacity to the drain pipe section 5 located below the silt basin main body 11.

[0053] Furthermore, dead leaves and the like contained in rainwater and the like are collected by the mesh member 13a, which makes it possible to prevent the drain pipe portion 5 from being clogged with dead leaves and the like.

[0054] Also, for example, after removing another silt bin (not shown) from the catchment bin 2 that has overflowed with rainwater or the like during a torrential downpour, the silt bin 1 is installed on the first bottom wall portion 3a. At that time, for example, it is possible to adjust the height of the silt bin 1 to be maximized within a range in which the silt bin 1 does not protrude from the catchment bin 2. This makes it possible to adjust the height of the silt bin main body 11 so as to maximize the flow path cross-sectional area between the silt bin main body 11 and the first bottom wall portion 3a according to the depth of the catchment bin 2, and therefore, for example, it is possible to prevent rainwater or the like from overflowing from the catchment bin 2 during the next torrential downpour.

[0055] In recent years, the frequency of torrential rain, also known as guerilla downpours, has been increasing. During such torrential rain, the amount of rain increases rapidly locally, and rainwater, etc. may overflow from the drainage manhole 2 of the road in the area where the torrential rain occurs. Furthermore, even if the amount of rain is not as much as that of torrential rain, it may be discovered after the construction of a new road that the drainage from the road surface is concentrated in some of the drainage manholes 2 due to the shape and slope of the road, etc., and rainwater, etc. may overflow from the drainage manhole 2. By installing the silt manhole 1 according to this embodiment instead of the other silt manholes of the drainage manhole 2 that has overflowed with rainwater, etc. for these reasons, it is possible to prevent rainwater, etc. from overflowing from the drainage manhole 2 at the next time of torrential rain. Furthermore, by installing the silt manhole 1 according to this embodiment in the drainage manhole 2 that has overflowed with rainwater, etc., another silt manhole that is less expensive than the silt manhole 1 and does not require height adjustment can be installed in the drainage manhole 2 that has not overflowed with rainwater, etc. This will enable reductions in costs and shortening of construction times for new road construction projects.

[0056] In this embodiment, one drain hole 11c is provided, but two or more may be provided. Also, by making the opening area of ​​the drain hole 11c smaller than the area of ​​foreign matter such as dead leaves, the mesh member 13a may not be provided.

[0057] In the present embodiment, the leg 12 is formed of the bolt 17 and the nut 18, but it may be formed of a ball screw mechanism consisting of a screw shaft, a nut, and a ball. Also, as long as the amount of downward protrusion from the bottom surface of the second bottom wall portion 11a can be adjusted (changed), it may be formed by means other than the screw mechanism (for example, a rack and pinion mechanism having a rack extending in the vertical direction and a pinion meshing with the rack, or a mechanism having a rod-shaped member extending in the vertical direction and having multiple recesses on its outer surface and a claw that can selectively engage with the multiple recesses).

[0058] Furthermore, in this embodiment, four legs 12 are provided, but the number may be three or less, or four or more.

[0059] In addition, in this embodiment, the storage section 13 is provided, but if the locking mechanism 9 is not provided, the storage section 13 does not need to be provided in the silt trap body 11.

[0060] In addition, in this embodiment, the nut pocket 16 is provided on the bottom surface of the foreign matter reservoir 14, but it may be provided on the bottom surface of a portion of the storage section 13 where the drain hole 11c is not provided.

[0061] In addition, in this embodiment, a second through hole portion 16c is provided in the nut pocket 16, but if it is possible to cause the lower end of the bolt 17 to protrude downward from the nut pocket 16, a slit or the like may be provided instead of the second through hole portion 16c.

[0062] In addition, in this embodiment, the nut pocket 16 is provided, but it is not necessary to provide the nut pocket 16. For example, when the bolt 17 and the nut 18 are made of a metal material, the nut 18 may be fixed to the bottom surface or the top surface of the second bottom wall portion 11a of the silt trap body 11.

[0063] In addition, in this embodiment, two foreign matter reservoirs 14 are provided, but one or three or more may be provided.

[0064] In addition, in this embodiment, the adjustment process (step S5 in FIG. 7) is performed after the setting process (step S4 in FIG. 7), but the adjustment process may be performed before the setting process, or may be performed before and after the setting process.

[0065] In addition, in Figure 7 of this embodiment, an example has been described in which the silt manhole 1 is installed in the drainage manhole 2 after other silt manholes installed in the drainage manhole 2 have been removed from the drainage manhole 2, but the silt manhole 1 may also be installed in a drainage manhole 2 that has no other silt manholes installed therein since it was first constructed on the shoulder of a road. [Industrial Applicability]

[0066] The present invention is directed to a silt basin and a method for installing the silt basin. [Explanation of symbols]

[0067] 1 silt basin 2. Drainage basin 3 Lower manhole (main body of the drainage manhole) 3a First bottom wall section (bottom wall of the drainage basin body) 4 Upper manhole (main body of the drainage manhole) 5 Drain pipe section 6 Box lid (lid part) 6d opening 9 Locking mechanism 10. Drainage basin body 11 Silt basin body 11a Second bottom wall part (bottom wall of the silt basin body) 11c Drain hole 11e First through hole portion (insertion hole) 12 Legs 13 Storage unit 13a Mesh member 14 Foreign matter collection area 16 Nut Pocket 17 Volts 17c Thread part (male thread part) 18 Nut 18a Screw hole (female screw) S3 extraction process S4 Set process S5 Adjustment Process

Claims

1. A silt basin that can be installed on the bottom wall of a drainage basin includes a drainage basin body, a lid portion that is attached to an upper opening of the drainage basin body and has an opening that allows drainage water from the road surface to flow into the drainage basin body, and a drainage pipe portion that is connected to the bottom wall of the drainage basin body and allows the drainage water that has flowed into the drainage basin body to flow out of the drainage basin body, A silt basin body having a foreign matter storage portion for storing foreign matter contained in the wastewater; A leg portion is provided so as to protrude downward from the bottom surface of the silt basin body, A silt basin characterized in that the leg is configured so that the amount of downward protrusion from the bottom surface can be adjusted.

2. The silt basin according to claim 1, A silt trap characterized in that the leg portion has a bolt extending in the vertical direction and having a male thread portion on its outer surface, and a nut having a female thread portion that screws into the male thread portion.

3. The silt basin according to claim 2, A silt basin characterized in that the bolts and nuts are made of resin material.

4. The silt basin according to claim 3, A nut pocket is provided on the bottom wall of the silt basin body so as to protrude downward from the bottom surface thereof, The nut pocket is configured to restrict rotation of the nut in a state in which the nut is accommodated, A silt basin characterized in that a through hole through which the bolt can be inserted is provided at a position corresponding to the nut pocket on the bottom wall of the silt basin body.

5. The silt basin according to claim 4, The silt basin main body is provided with an accommodating portion for accommodating a locking mechanism capable of switching between a state in which the lid portion is fixed to the drainage basin main body and a state in which it is not fixed, A drainage hole portion penetrating in the vertical direction is provided in a portion corresponding to the storage portion in the bottom wall of the silt basin body, A silt basin characterized in that the nut pocket is provided in a portion of the bottom wall of the silt basin body corresponding to the foreign matter accumulation portion.

6. The silt basin according to claim 5, A silt basin characterized in that a mesh member is attached to the drainage hole portion.

7. A method for installing a silt basin according to any one of claims 1 to 6, comprising: A removal process of removing another silt basin different from the silt basin from the drainage basin; After the removal step, a setting step of setting the silt basin on the bottom wall of the drainage basin body; A method for installing a silt pit, comprising: an adjustment step of adjusting the height of the silt pit in accordance with the depth of the drainage pit at least either before or after the setting step.

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