Dam structure and method for constructing the same

Abstract

To provide a technique capable of capturing objects such as driftwood overflowing a water passage with water from upstream while damming up fine earth and sand.SOLUTION: A dam structure includes: an impermeable dam 2 formed with a water passage 23 through which water flows from upstream; and a capturing body 3 that is attached to the dam 2 at least partially facing the water passage part 23 on the upstream side and captures objects flowing from the upstream side of the river and allows water to pass therethrough. The capturing body 3 has multiple column members 31 that are provided at predetermined intervals in the width direction W of the river on the upstream wall surface of the dam 2 facing the upstream side of the river, and side beam members 33 provided between the dam 2 and end column members 31b positioned at both ends of the multiple column members 31 in the width direction W. One end of the column member 31 and the side beam member 33 are buried in the dam 2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a dam structure and a method for constructing a dam structure. [Background technology]

[0002] In rivers in mountainous areas, large amounts of sediment and other debris can be washed away in the event of landslides caused by typhoons or heavy rain, which can lead to widespread damage. As a countermeasure, for example, impermeable dams are installed in rivers that do not contain large gravel but contain large amounts of fine gravel and sediment (see, for example, Patent Document 1).

[0003] An impermeable dam has a main body that mainly blocks sediment, and a pair of sleeves that are spaced apart at a predetermined interval on the main body to form a water passage with a cross-section large enough to allow the target flow rate of the river to pass through. An impermeable dam blocks sediment while allowing the water to flow downstream without blocking the river water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-167735 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even when the construction of an impermeable dam is being considered in a river where there is a large amount of sediment but no large gravel, there are concerns about the occurrence of debris flows and driftwood. With conventional impermeable dams, for example, driftwood could ride the water flow over the accumulated sediment and overflow the water passage.

[0006] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide a technology that can dam up fine soil and sand while capturing objects such as driftwood that attempt to overflow the water passage along with water from upstream. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention comprises an impermeable dam formed with a water passage section that allows water from upstream to flow through, and a capture body that is attached to the dam on the upstream side with at least a portion facing the water passage section and captures objects flowing from upstream of the river to allow water to pass through, wherein the capture body has a plurality of pillar members arranged at a predetermined interval in the width direction of the river on the upstream wall of the dam facing the upstream side of the river, and beam members arranged between the dam and the pillar members located at both ends of the plurality of pillar members in the width direction, and one end of the pillar members and the beam members is embedded in the dam.

[0008] In addition, in one aspect of the dam structure of the present invention, one end of each of the column members and the beam members may be connected to a connecting portion inside the dam having an anchor plate and a plurality of anchor bolts inserted into the anchor plate.

[0009] Furthermore, in order to achieve the above-mentioned object, the method includes a dam construction process for constructing an impermeable dam so that a water passage section is formed to allow water from upstream to flow through, a capture body connection process for connecting a capture body that captures objects flowing from upstream of the river and allows water to pass through to the dam on the upstream side so that at least a portion of the capture body faces the water passage section, and a fixing process for pouring concrete into the part of the capture body connected to the dam to fix the capture body to the dam.

[0010] In addition, in one aspect of the construction method of the present invention, the dam construction process includes a main body construction process of constructing a main body extending in the width direction of the river and having a predetermined height on the bottom of the river, and a sleeve construction process of constructing a pair of sleeves on the main body at a predetermined interval in the width direction so as to form the water passage portion, and in the main body construction process, a recess may be formed in the area of ​​the main body to which the capture body is attached, which is recessed relative to other wall areas of the main body, and in the sleeve construction process, a recess may be formed in the area of ​​the sleeve to which the capture body is attached, which is recessed relative to other wall areas of the sleeve.

[0011] In addition, one aspect of the construction method of the present invention may further include a connection portion forming step of driving multiple anchor bolts into each connection position in the recess where the capture body is attached, and attaching anchor plates to the anchor bolts at the connection positions so that all of the anchor plates are substantially on the same plane, thereby forming a connection portion that is connected to the capture body.

[0012] In addition, in one aspect of the construction method of the present invention, in the fixing step, concrete may be poured into the recess so that the wall surface area of ​​the main body in the recess is flush with the other wall surface areas, and concrete may be poured into the recess so that the wall surface area of ​​the sleeve portion in the recess is flush with the other wall surface areas.

[0013] In addition, in one aspect of the construction method according to the present invention, the gap between the wall surface and the anchor plate may be adjusted by moving the anchor plate relative to the anchor bolt.

[0014] In addition, in one aspect of the construction method of the present invention, a base plate provided at one end of each of the column member and the beam member connected to the anchor plate via the anchor bolt may have a hole through which the anchor bolt is inserted, and the connection position of the column member and the beam member relative to the wall surface may be adjusted via a gap between the inner surface of the hole and the outer surface of the anchor bolt. [Effects of the Invention]

[0015] According to the present invention, it is possible to trap objects such as driftwood that are about to overflow the water passage along with water from upstream while blocking fine sediment. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a front view of a dam structure according to the present invention as viewed from the upstream side. [Figure 2] 1 is a perspective view of a dam structure according to the present invention as viewed from the upstream side. FIG. [Figure 3] FIG. 1 is a side view of a dam structure according to the present invention. [Figure 4A] FIG. 10 is a side view of a leg member of the pillar member. [Figure 4B] FIG. 10 is a cross-sectional view showing a state in which the leg member is connected to the connecting portion. [Figure 5] FIG. 10 is a diagram illustrating the configuration of a connecting portion. [Figure 6] FIG. 10 is a front view of the central upright member of the pillar member as seen from the upstream side. [Figure 7A] FIG. 10 is a front view of the upright end member of the pillar member as seen from the upstream side. [Figure 7B] FIG. 10 is a side view of the end upright member of the pillar member. [Figure 8A] 8 is an enlarged view of a portion VIIIA in FIG. 2, showing a side beam member. [Figure 8B] FIG. 10 is a plan view schematically showing a connecting portion between a side beam member and a connecting portion. [Figure 9] 1 is a flow chart showing a process for constructing a dam structure according to the present invention. [Figure 10A] This is a front view of the constructed dam. [Figure 10B] FIG. [Figure 11A] FIG. 10 is a front view of a dam with a connecting portion formed therein. [Figure 11B] 10A and 10B are diagrams for explaining a process of forming a connecting portion in a dam. [Figure 12A]FIG. 10 is a front view showing a dam in which a pillar member and a side beam member are connected to a connecting portion. [Figure 12B] 10A and 10B are diagrams illustrating a process of connecting a pillar member and a side beam member to a connecting portion. [Figure 13] 10 is a diagram illustrating the process of pouring concrete into a dam to which pillar members and side beam members are connected. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the following description, the drawings are schematic, and the dimensional relationships and ratios of elements may differ from the actual ones. The dimensional relationships and ratios may differ between the drawings.

[0018] <Configuration of dam structure> Fig. 1 is a front view of the dam structure 1 according to the present invention as seen from the upstream side. Fig. 2 is a perspective view of the dam structure 1 according to the present invention as seen from the upstream side. Fig. 3 is a view of the dam structure 1 according to the present invention as seen from the side. For ease of explanation, the width direction of the river is designated as "W", the flow direction of the river as "F", and the height direction of the installed dam structure 1 as "H".

[0019] The dam structure 1 comprises a dam 2 and a capture body 3. The dam structure 1 according to the present invention is an impermeable dam 2 equipped with a capture body 3, and has an enhanced capture function for capturing driftwood, rocks, and other objects in addition to sediment flowing from the upstream of the river. The dam structure 1 according to the present invention comprises an impermeable dam 2 formed with a water passage section 23 through which water from upstream flows, and a capture body 3 attached to the dam 2 on the upstream side with at least a portion thereof facing the water passage section 23 to capture objects flowing from the upstream side of the river and allow the water to pass through, the capture body 3 having a plurality of pillar members 31 provided at predetermined intervals in the width direction W of the river on the upstream wall surface of the dam 2 facing the upstream side of the river, and side beam members 33 provided between the dam 2 and end pillar members 31b located at both ends of the plurality of pillar members 31 in the width direction W, and the dam 2, with one end of the pillar members 31 and the side beam members 33 being embedded in the dam 2. The dam structure 1 according to the present invention will be described in detail below.

[0020] (dam) The dam 2 has its bottom buried in the ground and is constructed to extend across the river in the width direction W. The dam 2 is constructed as an impermeable dam, and is constructed, for example, from concrete or soil cement. Note that in the dam 2, the upstream wall surfaces 211, 222 facing the upstream side of the river and the downstream wall surfaces 212, 223 facing the downstream side may be steel plate walls formed by connecting multiple steel segments, and the interiors of these may be filled with concrete or soil cement.

[0021] The dam 2 has a main body 21 and a pair of sleeves 22, with a water passage 23 formed between the pair of sleeves 22. The main body 21 is provided on the river bottom side of the dam 2 and is constructed at a predetermined height in the height direction H from the river ground so as to block sediment flowing from the upstream side. The main body 21 is connected to both banks of the river. The main body 21 is formed in a substantially trapezoidal shape in side view. An upstream wall surface 211 of the main body 21 facing the upstream side slopes downstream as it extends upward from the river bottom toward the sleeves 22. Furthermore, a downstream wall surface 212 of the main body 21 facing downstream slopes downstream as it extends upward from the river bottom toward the sleeves 22. The inclination angle of the upstream wall surface 211 is smaller than the inclination angle of the downstream wall surface 212. The upstream wall surface 211 and the downstream wall surface 212 of the main body 21 may extend vertically from the bottom of the river toward the sleeve portion 22.

[0022] Each sleeve 22 is provided on the main body 21. The sleeves 22 are provided connected to both banks of the river at intervals in the width direction W of the river. Each sleeve 22 has a top surface 221, an upstream wall surface 222, a downstream wall surface 223, and a side wall surface 224. The top surface 221 is a flat surface facing upward of the dam structure 1. The top surface 221 extends horizontally or approximately horizontally from both banks toward the water passage portion 23, and then extends diagonally downward toward the side wall surface 224 (described later) toward the main body 21.

[0023] Upstream wall surface 222 faces the upstream side of the river, is continuous with upstream wall surface 211 of main body 21, and extends vertically from upstream wall surface 211 of main body 21 toward top surface 221. Downstream wall surface 223 faces the downstream side of the river, is continuous with downstream wall surface 212 of main body 21, and extends vertically from downstream wall surface 212 toward top surface 221. Note that upstream wall surface 222 may be inclined downstream from main body 21 toward top surface 221, and downstream wall surface 223 may be inclined upstream from main body 21 toward top surface 221.

[0024] The side wall surfaces 224 extend between the upstream wall surface 222 and the downstream wall surface 223 along the river flow direction F. The side wall surfaces 224 of each sleeve portion 22 face each other at a predetermined interval in the width direction W, and a water passage portion 23 is formed between the side wall surfaces 224. The side wall surfaces 224 extend from the main body 21 side toward the top surface 221, sloping away from each other.

[0025] The water passage section 23 is provided near the center of the dam 2 in the width direction W of the river. Specifically, the water passage section 23 is formed as a recess between the side wall surfaces 224 of the sleeve section 22 that extends from both banks of the river on which the dam structure 1 is constructed to the center of the river. The water passage section 23 is formed to collect water flowing from upstream near the center of the dam 2 and direct it downstream.

[0026] (Capture body) The capture body 3 has a plurality of pillar members 31 and side beam members 33. The capture body 3 is a structure that captures objects flowing from upstream in the river and allows the flowing water to pass through. The capture body 3 is provided upstream of the main body 21 and sleeve 22 of the dam 2 so as to face the water passage section 23 in the flow direction F. The capture body 3 is provided along the extension direction of the dam 2, i.e., the width direction W of the river. The capture body 3 is constructed so that its length in the width direction W is longer than the width of the water passage section 23. Both ends of the capture body 3 in the width direction W are positioned so as to face at least the sleeve 22 of the dam 2. The capture body 3 is provided on the dam 2 so that at least a portion of it is located above the bottom surface of the water passage section 23 of the dam 2.

[0027] The capture body 3 is fixed to each of the main body 21 and the sleeve portion 22. The pillar members 31 are mainly formed of steel pipes and are fixed to the main body 21 (see FIG. 3). In this embodiment, thirteen pillar members 31 are provided at predetermined intervals from one another in the width direction W and at predetermined intervals from the dam 2 in the flow direction F. Of the multiple pillar members 31, three pillar members 31 at both ends in the width direction W are provided in positions overlapping with the sleeve portion 22, and six pillar members 31 are provided in positions overlapping with the water passage portion 23. The interval between adjacent pillar members 31 is preferably half the length of the largest driftwood expected to flow down the river, or a length equivalent to the diameter of the largest gravel expected to flow down the river.

[0028] The pillar member 31 has a leg member 310 and an upright member 313. The leg member 310 is fixed to the main body 21 at one end. For ease of explanation, the central pillar member 31 in the width direction W of the river will be referred to as the central pillar member 31a, and the pillar members 31 at both ends will be referred to as end pillar members 31b (see Figures 1 and 2). When there is no need to particularly distinguish between the two, they will simply be referred to as "pillar member 31." The leg member 310 is formed in a bifurcated shape and has a first leg portion 311 and a second leg portion 312 that are manufactured integrally with each other.

[0029] The first leg 311 extends obliquely upward from the upstream wall surface 211 toward the upstream side. The first leg 311 extends to a position facing at least the upstream wall surface 222 of the sleeve portion 22 or the water passage portion 23 in the height direction H of the dam structure 1. One end of the first leg 311 is fixed to the main body 21 below the second leg 312.

[0030] FIG. 4A is a side view of the leg member 310 of the pillar member 31. FIG. 4B is a cross-sectional view showing the leg member 310 connected to the connecting portion 213. The first leg portion 311 has a base plate 311a at one end connected to the main body 21. The base plate 311a is formed of a steel material that is circular or approximately circular in plan view. The outer periphery of the base plate 311a protrudes outward in an annular shape from the tubular portion of the first leg portion 311. The base plate 311a has four holes 311b formed at predetermined intervals in the circumferential direction. The inner diameter of the holes 311b is larger than the diameter of the anchor bolts 215 described below. When the anchor bolts 215 are inserted through the holes 311b, there is a gap between the inner periphery of the holes 311b and the outer periphery of the anchor bolts 215 that is large enough to absorb construction errors when connecting the first leg portion 311 to the main body 21.

[0031] The other end of first leg 311 extends vertically and has flange plate 311d. First leg 311 is connected to upright member 313 (described later) via flange plate 311d. Flange plate 311d has the same configuration as base plate 311a.

[0032] One end of the second leg 312 is fixed to the upper connecting portion 213 of the two rows of connecting portions 213 in the main body 21. The second leg 312 extends obliquely upward from the connecting portion 213 toward the upstream side. The other end of the second leg 312 is integrally connected to the first leg 311. The first leg 311 and second leg 312 of the pillar member 31 are constructed in a generally λ-shape when viewed from the side.

[0033] If the second leg 312 is arranged so as to follow the slope of the riverbed on the upstream side, the force of the debris flow can be received along the axial direction of the second leg 312. This is preferable because the second leg 312 can reduce the force that tries to peel the capture body 3 off the upstream wall surface 211 of the main body 21.

[0034] The second leg 312 has a base plate 312a at one end on the side connected to the main body 21. The base plate 312a is formed from a steel material that is circular or approximately circular in plan view. The outer periphery of the base plate 312a protrudes outward in an annular shape from the tubular portion of the second leg 312. The base plate 312a has four holes 312b formed at predetermined intervals in the circumferential direction. The inner diameter of the holes 312b is larger than the diameter of the anchor bolt 215, which will be described later. When the anchor bolt 215 is inserted through the holes 312b, there is a gap between the inner periphery of the holes 312b and the outer periphery of the anchor bolt 215 that is large enough to absorb construction errors when connecting the second leg 312 to the main body 21.

[0035] 5 is a perspective view of the connecting portions 213, 225 viewed from above and below. One end of each of the first leg portion 311 and the second leg portion 312 is embedded inside the main body 21. Specifically, the first leg portion 311 and the second leg portion 312 are each connected to a connecting portion 213 inside the main body 21. Each connecting portion 213 is provided at a position on the main body 21 where the first leg portion 311 and the second leg portion 312 of each pillar member 31 are to be installed. Each connecting portion 213 has one anchor plate 214 made of a steel plate and four anchor bolts 215.

[0036] The anchor plate 214 has a surface 214a that is parallel or approximately parallel to the upstream wall surface 211. The anchor plate 214 has holes 214b, through which anchor bolts 215 are inserted, spaced equally around a center point. The surfaces 214a of the anchor plates 214 in all of the connecting portions 213 are on or included in substantially the same plane P (see FIG. 4B).

[0037] Here, "substantially on the same plane or included in a plane" means that, assuming a virtual plane parallel to an ideal upstream wall surface 211 with no unevenness, the virtual plane and the surface 214a of the anchor plate 214 are flush with each other to the extent that they are flush, including construction tolerances, and do not necessarily have to be perfectly aligned.

[0038] The anchor bolt 215 is inserted through the hole 214b of the anchor plate 214. The free end of the anchor bolt 215 extends a predetermined length from the anchor plate 214. The position of the anchor bolt 215 in each connecting portion 213 is the same (see FIG. 11A). The anchor plate 214 is positioned with respect to the anchor bolt 215 on the back surface 214c side by a nut N1.

[0039] First leg 311 is connected to connecting portion 213 via base plate 311a. Anchor bolts 215 extend from holes 311b in base plate 311a of first leg 311, and nuts N2 are fastened to the extending portions of anchor bolts 215. As a result, first leg 311 is connected to anchor plate 214 and fixed to main body 21 (see FIG. 4B).

[0040] The second leg 312 is connected to the connecting part 213 via a base plate 312a. Anchor bolts 215 extend from holes 312b in the base plate 312a of the second leg 312, and nuts N2 are fastened to the extending portions of the anchor bolts 215. In this way, the second leg 312 is connected to the anchor plate 214 and fixed to the main body 21.

[0041] 6 is a front view of the central upright member 313a of the pillar member 31 as seen from the upstream side. One end of the upright member 313 is connected to the flange plate 311d of the first leg 311. The upright member 313 is provided above the first leg 311, which extends at an angle toward the upstream side, so as to change the oblique extension direction of the pillar member 31 to a vertical direction. Of the upright members 313, the member connected to the central pillar member 31a will be referred to as the central upright member 313a, and the member connected to the end pillar member 31b will be referred to as the end upright member 313b. When there is no need to particularly distinguish between the two, they will simply be referred to as the "upright member 313."

[0042] The central upright member 313a has an upright portion 314 and a pair of beam portions 315. The upright portion 314 is connected to the first leg portion 311 and extends in the vertical direction or a substantially vertical direction. The upright portion 314 has a flange plate 314a that is connected to the flange plate 311d of the central pillar member 31a of the pillar members 31.

[0043] The central upright member 313a has a pair of beams 315. The pair of beams 315 extend from the upright portion 314, crossing the upright portion 314 and facing each other in the width direction W, on the side closer to the end opposite the end connected to the first leg portion 311. A flange plate 315a is provided at the free end of each beam 315. The uprights 314 are connected to each other via the flange plates 315a of the beams 315 of the column members 31 adjacent to each other in the width direction W and the flange plates 317a of the end upright members 313b, which will be described later.

[0044] Fig. 7A is a front view of the end upright member 313b of the pillar member 31 as seen from the upstream side. Fig. 7B is a side view of the end upright member 313b of the pillar member 31 as seen from the side. Here, the end upright member 313b at the left end as seen from the upstream side will be described as an example. The end upright member 313b has an upright portion 316 and two beam portions 317, 318. The upright portion 316 is connected at one end to the first leg portion 311. The beam portions 317, 318 extend vertically or approximately vertically from the outer circumferential surface of the upright portion 316, forming right angles with each other.

[0045] When the upright portion 316 is connected to the first leg portion 311, the beam portion 317 extends in the width direction W, and the beam portion 318 extends in the flow direction F. Both beam portions 317, 318 have flange plates 317a, 318a, respectively. The beam portion 317 is connected to the beam portion 315 of the central upright member 313a via the flange plate 317a, and the beam portion 318 is connected to the side beam member 33 described below via the flange plate 318a. When the upright members 313 are connected to all the first leg portions 311, the beam portions 315, 317 of the upright members 313 adjacent in the width direction W are connected to each other to form a beam 32 facing the upstream side of the capture body 3 and extending in the width direction W (see FIGS. 1 and 2).

[0046] 8A is an enlarged view of part VIIIA in FIG. 2 to show the side beam member 33. FIG. 8B is a cross-sectional view showing the side beam member 33 connected to the connecting portion 225. One end of the side beam member 33 is connected to the end pillar member 31b, and the other end is fixed to the sleeve portion 22. The side beam member 33 captures objects such as driftwood that go around the capturing body 3 from the side. The side beam member 33 has a beam portion 331 and two upright portions 332.

[0047] The beam portion 331 has a base plate 331a at one end connected to the sleeve portion 22 and a flange plate 331b at one end connected to the beam portion 331 of the end column member 31b. The base plate 331a is formed of steel material that is circular or approximately circular in plan view. The outer periphery of the base plate 331a protrudes outward in an annular shape from the tubular portion of the beam portion 331. The base plate 331a has four holes 331c formed at predetermined intervals in the circumferential direction. The inner diameter of the holes 331c in the base plate 331a is larger than the diameter of the anchor bolts 227 (described later). When the anchor bolts 227 (described later) are inserted through the holes 331c in the base plate 331a, there is a gap between the inner periphery of the holes 331c and the outer periphery of the anchor bolts 215 that is large enough to absorb construction errors when connecting the second leg portion 312 to the main body 21. The configuration of the flange plate 331b is the same as that of the base plate 331a, and therefore a description thereof will be omitted here.

[0048] One end of the side beam member 33 is embedded inside the sleeve section 22. Specifically, the side beam member 33 is connected to a connecting portion 225 inside each sleeve section 22. Each connecting portion 225 is provided at a position in the sleeve section 22 where the side beam member 33 is installed. The connecting portion 225 has one anchor plate 226 made of steel plate and four anchor bolts 227 (see FIG. 5).

[0049] The anchor plate 226 has a surface 226a that is parallel or approximately parallel to the upstream wall surface 211. The anchor plate 226 has holes 226b, through which anchor bolts 227 are inserted, spaced equally around the center point. The surfaces 226a of the anchor plates 226 in all of the connecting portions 225 are on substantially the same plane or are included in a plane.

[0050] Here, "substantially on the same plane or included in a plane" means that, if we imagine a virtual plane parallel to an ideal upstream wall surface 222 with no unevenness, that virtual plane and the surface 226a of the anchor plate 226 are flush with each other to an extent including construction tolerances, and do not necessarily need to be perfectly aligned.

[0051] Four anchor bolts 227 are provided at equal intervals around the center point of the anchor plate 226 in the connecting portion 225. The anchor bolts 227 are inserted through the anchor plate 226. The free ends of the anchor bolts 227 extend a predetermined length from the anchor plate 226. The positions of the anchor bolts 227 in each connecting portion 225 are all the same (see FIG. 11A).

[0052] The side beam member 33 is connected to the connecting portion 225 via a base plate 331a. Anchor bolts 227 extend from each hole in the base plate 331a of the side beam member 33, and nuts N4 are fastened to the extending portions of the anchor bolts 227. In this way, the side beam member 33 is connected to the anchor plate 226 and fixed to the sleeve portion 22.

[0053] The two upright portions 332 protrude in two vertical directions (up and down directions) from the outer circumferential surface of the beam portion 331. The upright portions 332 are provided at a predetermined interval from each other along the extending direction of the beam portion 331 (flow direction F).

[0054] <Construction method of dam structure> The steps for constructing a dam structure 1 according to the present invention are described below. Figure 9 is a flow chart showing the steps for constructing a dam structure 1 according to the present invention. The method for constructing a dam structure 1 according to the present invention is characterized by including a dam construction step S1 in which an impermeable dam 2 is constructed so as to form a water passage section 23 through which water from upstream flows; a trapping body attachment step S3 in which a trapping body 3 that traps objects flowing from upstream of the river and allows water to pass through is attached to the dam 2 on the upstream side so that at least a portion of the trapping body faces the water passage section 23; and a fixing step S4 in which concrete C is poured into the portion of the trapping body 3 attached to the dam 2 to fix the trapping body 3 to the dam. The method for constructing a dam structure 1 according to the present invention is described below in detail.

[0055] FIG. 10A is a front view of the constructed dam 2. FIG. 10B is a side view of the dam 2. First, an impermeable dam 2 is constructed (dam construction step S1). In the dam construction step S1, the main body 21 of the dam 2 is constructed first (main body construction step S11). In the main body construction step S11, a formwork is assembled to extend in the width direction W of the river and have a predetermined height, and concrete is poured into the formwork to construct the main body 21 on the bottom of the river. A recess 21a is formed in the main body 21 constructed in the main body construction step S11.

[0056] The recess 21a is a portion formed in the area of ​​the main body 21 where the pillar member 31 of the capture body 3 is attached, recessed relative to the other wall surface area (corresponding to the upstream wall surface 211) 21b of the main body 21. The recess 21a is formed across the area where the pillar member 31 of the capture body 3 is installed in the width direction W and height direction H. The thickness of the main body 21 in the area of ​​the recess 21a is thinner than the designed thickness of the main body 21. In contrast, the thickness of the other wall surface area 21b of the main body 21 is the designed thickness of the main body 21.

[0057] Next, after the concrete of the main body 21 has hardened, a pair of sleeves 22 are constructed at a predetermined interval in the width direction W so that a water passage 23 is formed on the main body 21 (sleeve construction step S12). In the sleeve construction step S12, formwork is assembled at both ends of the main body 21 in the width direction W, and concrete is poured into the formwork to construct the sleeves 22. A recess 22a is formed in the sleeves 22 constructed in the sleeve construction step S12.

[0058] The recess 22a is a portion formed in the region of the sleeve 22 where the side beam member 33 of the capture body 3 is attached, recessed relative to the other wall surface region 21b of the sleeve 22. The recess 22a is formed in the region where the side beam member 33 of the capture body 3 is installed in the width direction W and height direction H. The thickness of the sleeve 22 in the region of the recess 22a is thinner than the designed thickness of the sleeve 22. In contrast, the thickness of the other wall surface region 22b of the sleeve 22 (corresponding to the upstream wall surface 222) is the designed thickness of the sleeve 22.

[0059] FIG. 11A is a front view of the dam 2 on which the connecting portions 213, 225 are formed. FIG. 11B is a diagram illustrating the step of forming the connecting portions 213, 225 on the dam 2. Next, the connecting portions 213, 225 for connecting the capture body 3 to the dam 2 are formed (connecting portion forming step S2). In the connecting portion forming step S2, the connecting portions 213 are formed in the recesses 21a of the main body 21 in which each pillar member 31 of the capture body 3 is to be installed. In order to determine the installation positions of the pillar members 31, the temporary upstream wall surface 211a of the recesses 21a is marked out. Based on the marking, four anchor bolts 215 are driven into each position of the temporary upstream wall surface 211a of the recesses 21a in which the pillar members 31 are to be installed.

[0060] Next, nuts N1 (see FIG. 4B) are fastened to the four anchor bolts 215, respectively, to attach the anchor plates 214 to the anchor bolts 215. This operation is performed at each position where the pole members 31 are to be installed. In this case, the anchor plates 214 to which the pole members 31 are connected are attached so that all of the anchor plates 214 are on substantially the same plane P.

[0061] Similarly, connecting portions 225 are formed in the recesses 22a of the sleeve portions 22 where the side beam members 33 of the capture body 3 are to be installed. In order to determine the installation positions of the side beam members 33, the temporary upstream wall surface 222a in the recesses 22a is marked out. Based on the marking out, four anchor bolts 227 are driven into each position of the temporary upstream wall surface 222a in the recesses 22a where the side beam members 33 are to be installed.

[0062] Next, nuts N3 (see FIG. 8B) are fastened to the four anchor bolts 227, respectively, to attach the anchor plates 226 to the anchor bolts 227. This operation is performed for each sleeve portion 22. In this case, the anchor plates 226 are attached so that the anchor plates 226 in each sleeve portion 22 to which the side beam members 33 are connected are on substantially the same plane P.

[0063] In the connection portion forming process S2, if the anchor plates 214, 226 at one position are located away from the upstream wall surfaces 211a, 222a (not on the same plane) relative to the anchor plates 214, 226 at other positions, the positions of the anchor plates 214, 226 can be adjusted by adjusting the positions of the nuts N1, N3 attached to the anchor bolts 215, 227.

[0064] The step of forming the connecting portion 213 in the main body 21 and the step of forming the connecting portion 225 in the sleeve portion 22 may be performed in either order, or may be performed simultaneously.

[0065] FIG. 12A is a front view showing the dam 2 in which the pillar members 31 and the side beam members 33 are connected to the connecting portions 213 and 225. FIG. 12B is a diagram illustrating the process of connecting the pillar members 31 and the side beam members 33 to the connecting portions 213 and 225. Next, the capture body 3 is connected to the connecting portions 213 and 225 on the upstream side of the dam 2 so that at least a portion faces the water passage portion 23 (capture body connecting process S3). First, with the leg member 310 hoisted by a crane, the anchor bolts 215 of the connecting portion 213 are inserted into the holes 311b and 312b in the base plate 311a of the first leg 311 and the base plate 312a of the second leg 312, respectively. With the leg member 310 hoisted, a desired position and posture are determined, and nuts N2 are fastened to the anchor bolts 215 protruding from each base plate 311a and 312a. As a result, the leg member 310 is connected to the connecting portion 213 .

[0066] The leg members 310 are connected to the connecting portions 213 alternately on the left and right sides from the center of the installation width of the capture body 3, with the central upright member 313a connected to each central pillar member 31a. Adjacent leg members 310 may also be connected to each other via two length-adjustable connecting members (not shown).

[0067] Next, the side beam member 33, suspended by a crane, is brought close to the position where the side beam member 33 is to be attached. The anchor bolts 227 protruding from the connecting portions 225 are inserted into the holes in the base plates 331a of the beam portions 331 of the side beam member 33, and nuts N4 are fastened to the anchor bolts 227 protruding from each base plate 331a. This connects the side beam member 33 to the connecting portions 225.

[0068] Next, the end upright member 313b is connected to the central upright member 313a and the side beam member 33. The end pillar member 31b and the central upright member 313a are connected to each other via their respective flange plates 317b and 315a. Also, the side beam member 33 and the end upright member 313b are connected to each other via their respective flange plates 331b and 318a.

[0069] 13 is a diagram illustrating the process of pouring concrete into the dam 2 to which the pillar members 31 and the side beam members 33 are connected. Next, concrete is poured into the portions of the capture body 3 connected to the recesses 21a, 22a of the main body 21 and sleeve portion 22 of the dam 2, to fix the capture body 3 to the dam 2 (fixing process S4).

[0070] In the fixing step S4, formwork (not shown) is assembled for the recesses 21a, 22a, and concrete is poured into the formwork. As a result, the upstream wall surfaces 211, 222 are formed at the positions of the recesses 21a, 22a, respectively. Through the above steps, the dam structure 1 according to the present invention is constructed.

[0071] In the above-described dam structure 1, the end of the trapping body 3 is buried inside the dam 2. As a result, even if the trapping body 3 of the dam structure 1 according to the present invention receives the same moment as that applied to a trapping body in a dam structure in which a trapping body is installed in an existing impermeable dam, the moment is received by the entire dam structure 1. Therefore, compared to trapping bodies installed in existing dams, the thickness of the steel pipes used can be thinner or the shape of the steel pipes can be smaller, allowing for a reduction in the weight of the entire trapping body 3.

[0072] Furthermore, in the dam structure 1, the capture body 3 is connected to the connecting portions 213, 225 inside the dam 2. This increases the integration of the dam 2 and the capture body 3, and increases the strength of the dam structure 1 as a whole.

[0073] <Other> Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and includes all aspects encompassed by the concept and scope of the claims. Furthermore, the configurations of the above embodiments may be appropriately and selectively combined to achieve at least some of the above-described problems and advantages. For example, in the above embodiments, the anchor bolts 215, 227 used in the connecting portions 213, 225 are not particularly limited, but may be structural anchor bolts. This further increases the connection strength between the dam 2 and the capture body 3. [Explanation of symbols]

[0074] 1. Dam structure 2. Dam 21... main body, 21a... recess, 22... sleeve portion, 22a... recess, 23... water passage portion 3. Capture body 31 Column member, 32 Beam, 33 Side beam member (beam member)

Claims

1. An impermeable dam with a water passage that allows water from upstream to flow through, a catcher attached to the dam on the upstream side with at least a portion facing the water passage portion, and which catches objects flowing from the upstream side of the river and allows water to pass through; Equipped with The capture body includes a plurality of pillar members provided at predetermined intervals in the width direction of the river on the upstream wall surface of the dam facing the upstream side of the river, and beam members provided between the dam and pillar members located at both ends of the plurality of pillar members in the width direction, one end of the pillar member and one end of the beam member are buried in the dam, one end of each of the pillar members and the beam members is connected to a connecting portion having an anchor plate and a plurality of anchor bolts inserted into the anchor plate inside the dam, The anchor plates at the connecting portions of all of the column members are attached so as to be on substantially the same plane, and the anchor plates at the connecting portions of all of the beam members are attached so as to be on substantially the same plane. A dam structure characterized by the above.

2. a dam construction process for constructing an impermeable dam so as to form a water passage for allowing water from upstream to flow; a capture body connecting step of connecting a capture body that captures objects flowing from the upstream of the river and allows water to pass through to the dam on the upstream side so that at least a portion of the capture body faces the water passage portion; a fixing step of fixing the trapping body to the dam by pouring concrete into the portion of the trapping body connected to the dam; Including, The dam construction step includes: a body construction step of constructing a body on the bottom of the river, the body extending in the width direction of the river and having a predetermined height; a sleeve construction step of constructing a pair of sleeves on the main body at a predetermined interval in the width direction so as to form the water passage portion; Including, In the body construction step, a recess is formed in a region of the body to which the capture body is attached, the recess being recessed relative to other wall surface regions of the body; In the sleeve construction step, a recess is formed in the region of the sleeve to which the capture body is attached, the recess being recessed relative to other wall surface regions of the sleeve, The method further includes a connecting portion forming step of driving a plurality of anchor bolts into the recess where the capture body is attached at each connecting position, and attaching anchor plates to the anchor bolts at the connecting positions to form connecting portions that are connected to the capture body, The capture body includes a plurality of pillar members provided at predetermined intervals in the width direction of the river on the upstream wall surface of the dam facing the upstream side of the river, and beam members provided between the dam and pillar members located at both ends of the plurality of pillar members in the width direction, In the connecting portion forming step, the anchor plates are attached to the connecting portions of all of the column members so that the anchor plates are located on substantially the same plane, and the anchor plates are attached to the connecting portions of all of the beam members so that the anchor plates are located on substantially the same plane. A method for constructing a dam structure, comprising:

3. 3. A method for constructing a dam structure according to claim 2, wherein the distance between the wall surface of the dam and the anchor plate is adjusted by moving the anchor plate relative to the anchor bolt.

4. A method for constructing a dam structure as described in claim 2 or 3, characterized in that a base plate provided at one end of the capture body, which is connected to the anchor plate via the anchor bolt, has a hole through which the anchor bolt is inserted, and the connection position of the capture body relative to the wall surface of the dam is adjusted via the gap between the inner surface of the hole and the outer surface of the anchor bolt.

5. A method for constructing a dam structure described in any one of claims 2 to 4, characterized in that in the fixing process, concrete is poured into the recess so that the wall surface area of ​​the main body in the recess is flush with the other wall surface areas, and concrete is poured into the recess so that the wall surface area of ​​the sleeve portion in the recess is flush with the other wall surface areas.

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