JP2007277972A - Erosion control dam bank and method of constructing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erosion control dam bank with excellent construction efficiency and economic efficiency and a method of constructing it. <P>SOLUTION: This steel slit dam 6 is structured by joining a beam material 7 arranged in the river crossing direction to the head part of a column material 8 built by burying its lower end into a foundation concrete 5 deposited at the bottom part between concrete band bodies 2, 2. A sheath pipe 10 is buried in the surface of the concrete bank body 2 facing the river center part. The beam material 7 is fixed by inserting its end into the sheath pipe 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a sabo dam in which a steel slit dam is installed between concrete dam bodies, and a construction method thereof, and more specifically, relates to a sabo dam with excellent workability and economy and a construction method thereof.

  Since Japan has steep topography and is composed of fragile geology, it is known that it suffers a great deal of damage from sediment disasters such as boulders and driftwood caused by heavy rains in the rainy season and typhoon. For this reason, various sabo dam technologies have been developed to prevent the secondary disasters from occurring, by allowing relatively small stones and sediment contained in the water to flow through in the sediment disaster and flowing downstream and preventing boulders from flowing downstream. ing. As an example, Patent Documents 1 and 2 listed below disclose a technique for installing a three-dimensional sabo dam composed of a plurality of pillar members and a beam member connecting the pillar members between concrete dam bodies. Yes. However, because this sabo dam has a three-dimensional structure, it takes time to assemble in the field, and it is difficult to repair parts damaged by catching boulders and driftwood, and to remove sediments and gravel. There are many problems, such as a very large number of parts due to the configuration and an increased manufacturing cost. Therefore, as a sabo dam that solves the above problem, for example, in Patent Document 3 below, the bottom end of the pillar is built in the foundation concrete, and is placed in the river transverse direction and directly to the concrete dam body. It is described that the structure is a plane structure formed by joining the embedded and fixed beam members. This sabo dam is configured to receive impact forces such as debris flow and driftwood directly with beams and columns, and to transmit the impact forces to the concrete dam body and foundation concrete, and is highly safe against out-of-plane loads. It is a structure.

  The sabo dam disclosed in the following Patent Document 4 is a joining means such as welding or bolt joining to an anchor previously embedded in a concrete dam body at the head of a pillar material built with a lower end embedded in foundation concrete. This is a planar structure in which the beam members fixed in (1) are joined.

  Further, in the sabo dam disclosed in Patent Document 5 below, a storage portion that supports both ends of the beam material is formed on the concrete levee, and the beam material that is supported at both ends by the storage portion is the same beam. It is fixed with a steel bar that penetrates the material. The beam member and the column member are integrally connected. The lower end portion of the column material is fixed by being embedded in the foundation concrete.

Japanese Patent No. 2607336 Japanese Patent Publication No. 5-2050 JP 2002-121728 A Japanese Patent Publication No.59-40966 JP 2001-303538 A

  Since the sabo dam disclosed in Patent Document 3 has a structure in which both ends of the beam material are directly embedded and fixed in the concrete dam body, if the concrete, the beam material, or the column material expands or contracts due to a temperature change, the crack of the concrete due to thermal stress is generated. It becomes a problem. In addition, after capturing debris flow and driftwood, steel slit dams may be removed together to remove them. However, it is time consuming to embed beams and pillars directly in the main body. . Furthermore, although there is no specific description of the construction method of the sabo dam, in the general construction method, first, a steel slit dam is formed by connecting a combination of a beam material and a column material, and then the steel slit dam. The procedure of placing concrete on the main body of the levee body is performed. However, this construction method requires a means for ensuring safety so that the steel slit dam does not fall when placing a concrete levee body, and there is a problem in workability and economy.

  Since the sabo dam disclosed in Patent Document 4 is also configured so that the beam material is fixed via anchors embedded in both ends of the dam body, the concrete, the beam material, and the column material are expanded and contracted due to temperature changes. The concrete cracks due to thermal stress. In addition, in order to fix both ends of the beam material through anchors embedded in the concrete body main body concrete in advance, construction errors become a problem.

  Since the sabo dam disclosed in the above-mentioned Patent Document 5 has a structure in which the beam material fixed to the concrete dam body is fixed only by the bar material, it is weak against strong impacts such as boulders or driftwood, and sufficient capture cannot be obtained. There's a problem. In addition, there is a problem in workability and economical efficiency, such as the necessity to provide a storage portion for supporting both ends of the beam material in the concrete bank.

  An object of the present invention is to provide a sabo dam and a construction method thereof that adopts a slidable structure capable of absorbing expansion and contraction strain and thermal stress of concrete, beam material, and column material due to temperature change, and suppressing cracking of concrete. is there.

  The next object of the present invention is a configuration capable of absorbing the construction error when installing the beam material on the concrete dam body, and further, the beam material and the column material can be attached and detached, and after debris flow and driftwood are captured, In order to remove them, the steel frame can be removed and the work can be done, the work can be done easily, the steel frame can be easily replaced, and the steel sabo dam can be easily restored, and the construction method is provided. It is to be.

  A further object of the present invention is to make it possible to separate the work of constructing a concrete dam body by placing concrete and the assembly work of a steel slit dam made of a beam material and a column material, in terms of workability and economy. It is to provide an excellent sabo dam and its construction method.

As means for solving the above-described problems of the prior art, the sabo dam according to the invention described in claim 1 is:
A sabo dam 1 in which a steel slit dam 6 is installed between the concrete dam bodies 2 and 2 on both sides of the river,
The steel slit dam 6 is a beam material arranged in the river crossing direction on the head of a pillar material 8 which is built by embedding the lower end portion in the foundation concrete 5 cast at the bottom between the concrete dam bodies 2 and 2. 7 is joined,
The concrete dam body 2 has a sheath pipe 10 embedded in the surface facing the river center.
The beam member 7 is fixed by inserting an end portion thereof into the sheath tube 10.

The invention described in claim 2 is the sabo dam according to claim 1,
A downstream beam member 9 joined to the beam member 7 via a connecting member 11 on the downstream side of the beam member 7 of the steel slit dam 6 in a plan view is embedded in the concrete dam body 2. It is characterized by being inserted into the sheath tube 10 and fixed.

The invention described in claim 3 is the sabo dam described in claim 1 or 2,
A plurality of beam members 7 constituting the steel slit dam 6 are provided in the height direction, and the ends of each beam member 7 are embedded in a sheath tube 10 embedded in a surface of the concrete dam body 2 facing the river center. It is characterized by being inserted into and fixed.

The invention described in claim 4 is the sabo dam according to any one of claims 1 to 3,
The sheath pipe 10 embedded in the concrete dam body 2 is characterized by being embedded in concrete after being positioned by a fixing metal 12.

The invention described in claim 5 is the sabo dam according to any one of claims 1 to 4,
A flanged steel member 7b obtained by dividing the beam member 7 is inserted into the sheath pipe 10 embedded in the concrete dam body 2, and the beam member 7 is connected by connecting the flanged steel member 7b and the beam member 7a. It is characterized by being installed.

The invention described in claim 6 is the sabo dam according to any one of claims 1 to 5,
The end of the beam member 7 is characterized in that it is positioned by filling a gap formed between the beam member 7 and the sheath tube 10 with a filler having elasticity, or is positioned by a fixing bracket.

The invention described in claim 7 is the sabo dam according to any one of claims 1 to 3,
In the concrete dam body 2, a flanged steel member 7b obtained by dividing the beam material 7 instead of the sheath tube 10 is embedded in advance, and the beam material 7 is connected by connecting the flanged steel member 7b and the beam member 7a. It is characterized by being installed.

The invention described in claim 8 is the sabo dam described in claim 7,
The flanged steel member 7b embedded in the concrete bank 2 is positioned by the fixing means 13 and embedded in the concrete.

The invention described in claim 9 is the sabo dam described in claim 1,
A plurality of pillar members 8 constituting the steel slit dam 6 are built in the width direction.

The invention described in claim 10 is the sabo dam according to claim 1 or 9,
The column member 8 has its lower end portion temporarily fixed by an anchor 14 and is built at the bottom portion between the concrete levee bodies 2 and 2 and is directly fixed to the cast foundation concrete 5 or a sheath tube 15 is used. It is built in the bottom part between concrete dam bodies 2 and 2, and is fixed to the foundation concrete 5 in which this sheath pipe was laid.

In the construction method of the sabo dam according to the invention described in claim 11,
A method of constructing a sabo dam with a steel slit dam between concrete dams on both sides of the river,
Constructing a concrete dam body 2 in which a sheath tube 10 having an inner diameter slightly larger than the outer diameter of the beam member 7 is embedded in a surface facing the center of the river;
A step of building the column member 8 at the bottom between the concrete dam bodies 2, 2;
The end of the flanged steel member 7b into which the beam material 7 is divided is inserted into the sheath pipe 10 embedded in the concrete dam body 2, and the remaining beam member 7a and the flanged steel member 7b are divided. Connecting and completing and installing the beam 7;
Joining the beam member 7 arranged in the river transverse direction to the head of the column member 8;
The sabo dam is characterized by comprising the step of embedding and fixing the lower end portion of the pillar material 8 built between the concrete dam bodies 2 into the foundation concrete 5 cast between the concrete dam bodies 2 and 2. Construction method.

The invention described in claim 12 is the construction method of the sabo dam according to claim 11,
The column member 8 is temporarily fixed to the bottom portion between the concrete dam bodies 2 and 2 by temporarily fixing the lower end portion thereof with the anchor 14, and directly fixed to the cast foundation concrete 5, or the concrete dam using the sheath pipe 15. It is built in the bottom part between the bodies 2 and 2, and is fixed to the foundation concrete 5 in which this sheath pipe 15 was laid.

  According to the sabo dam and its construction method of the present invention, the beam member 7 is installed by inserting an end portion into the sheath tube 10 embedded in the concrete dam body 2 in advance. A gap can be formed between the end of the slidable structure that can absorb the expansion and contraction of concrete, beam material 7 and column material 8, and the thermal stress is eliminated to prevent cracking of the concrete. Can do.

  Moreover, the sabo dam and the construction method of the present invention insert the end portion of the flanged steel member 7b into which the beam material 7 is divided into the sheath tube 10, and the remaining divided beam member 7a and the flanged steel member. 7b is assembled, the beam member 7 is assembled, completed, and installed, so that the construction error of the beam member 7 can be sufficiently absorbed. Moreover, since the beam member 7 and the column 8 are detachable, the steel slit dam 6 can also be removed (disassembled) for removing the debris flow and driftwood after they have been captured. Therefore, not only the removal work is simplified, but also the steel slit dam 6 can be easily restored.

  Furthermore, the sabo dam and its construction method of the present invention separate the work of constructing the concrete dam body 2 by placing concrete and the work of assembling the steel slit dam 6 composed of the beam material 7 and the column material 8. Since it is possible, it is not necessary to ensure the safety of the steel slit dam 6 between the concrete dam bodies 2 and 2 and the construction can be significantly shortened. Excellent in cost and economy.

  This is a sabo dam with a steel slit dam 6 installed between the concrete dam bodies 2 and 2 on both sides of the river, and its construction method. The foundation concrete 5 placed on the bottom between the concrete dam bodies 2 and 2 The beam material 7 arranged in the river crossing direction is joined to the head of the pillar material 8 embedded with the lower end portion embedded. In the concrete dam body 2, a sheath pipe 10 is embedded in a surface facing the river center, and an end portion of the beam member 7 is inserted into the sheath pipe 10 and fixed.

  The construction method of the sabo dam 1 is first a concrete dam body 2 in which a sheath pipe 10 having an inner diameter slightly larger than the outer diameter of the beam member 7 is embedded. Next, the column member 8 is built at the bottom between the concrete levee bodies 2. Next, the end portion of the flanged steel member 7b into which the beam material 7 is divided is inserted into the sheath pipe 10 embedded in the concrete dam body 2, and the remaining beam member 7a and the flanged steel member 7b are divided. To complete and install the beam 7. Next, the beam member 7 arranged in the river crossing direction is joined to the head of the column member 8. Finally, the lower end portion of the column member 8 built between the concrete levee bodies 2 and 2 is embedded and fixed in the foundation concrete 5 placed between the concrete dam bodies 2.

Below, the sabo dam and its construction method concerning the present invention are explained based on Drawings 1-15.
Figure 1 shows a sabo with a steel slit dam 6 between the concrete dam bodies 2 and 2 on both sides of the river in a mountainous area, where there are concerns about sediment-related disasters such as debris flows and driftwood caused by heavy rain in the rainy season and typhoon. An embodiment of the dam 1 is shown.

  The steel slit dam 6 of the sabo dam 1 is formed in the direction of crossing the river in the head of the column 8 constructed by burying the lower end portion of the foundation concrete 5 placed at the bottom between the concrete dam bodies 2 and 2. The beam members 7 arranged in the above are joined together. In the concrete dam body 2, a sheath pipe 10 is embedded in a surface facing the river center (opening surface of the slit), and the beam member 7 is inserted and fixed into the sheath pipe 10. Yes. The beam member 7 and the column member 8 of the steel slit dam 6 are mainly made of steel pipes, and both have an outer diameter of about 500 mm. Moreover, the magnitude | size of the steel slit dam 6 comprised with the beam material 7 and the column material 8 of a present Example is about 4m-5m in height, and about 4m-5m in width.

In the construction method of the sabo dam 1, first, as shown in FIG. 2, the lower part of the levee body main part concrete 3 is placed up to a height T at which the sheath pipe 10 is installed. The levee body main body concrete 3 is designed to have a height in consideration of the foundation concrete 5 to be placed for fixing the column member 8.
Next, as shown in FIG. 3, a sheath tube 10 having an inner diameter slightly larger than the outer diameter of the beam member 7 is installed on the upper surface portion of the levee body main body concrete 3, and the concrete is again placed and the sheath is placed. The pipe 10 is embedded in the concrete to complete the levee body main part concrete 3. Further, the concrete concrete dam body 2 is constructed by placing sleeve concrete 4 on the upper part of the levee body main body concrete 3. Incidentally, the sheath tube 10 is preferably made of steel that is resistant to wear and impact. The height of the concrete levee body 2 is 14.5 m at maximum.

  When the sheath pipe 10 is embedded in the concrete dam body 2, in order to adjust the position of the sheath pipe 10, the sheath pipe 10 is embedded in the concrete in a state where the sheath pipe 10 is positioned by the fixing brackets 12a to 12d (invention according to claim 4). FIGS. 8A to 8D show an example of means for positioning the sheath tube 10 with the fixing brackets 12a to 12d.

  That is, FIG. 8A shows an embodiment in which the sheath tube 10 is attached to the reinforcing bar or the turnbuckle 12a fixed to the concrete bank 2 and positioned. FIG. 8B shows an embodiment in which the beam receiving member 12 b fixed to the concrete dam body 2 with an anchor is attached to the sheath tube 10 and positioned. FIG. 8C shows an embodiment in which the sheath tube 10 is placed and positioned on the iron plate 12 c fixed to the concrete dam body 2 with an anchor. FIG. 8 (d) shows an embodiment in which the sheath tube 10 is placed and positioned on the screw adjustment fitting 12 d attached to the gantry fixed to the concrete dam body 2 with an anchor.

  Next, FIG. 4 shows a stage in which the lower end portion of the column member 8 is temporarily fixed by the anchor 14 and built in the bottom portion between the concrete dam bodies 2 and 2, and between the concrete dam bodies 2 and 2 using the sheath pipe 15. It shows the stage of building at the bottom. In addition, the wavy line X in FIG. 4 has shown the height of the foundation concrete 5 cast | placed in order to fix the lower end part of the pillar material 8. FIG.

  Next, FIG. 5 shows a step of inserting the end of the flanged steel member 7b into which the beam material 7 is divided into the sheath tube 10, and FIG. 6 shows the flanged steel member 7b and the beam member. 7a shows the step of joining and connecting 7a to complete the beam material 7. The flanged steel member 7b and the beam member 7a are bolted via a flange, but may be implemented as a welded joint. The flanged steel member 7b is positioned by filling the gap with the sheath tube 10 with a stretchable filler, or positioned by a fixing bracket (invention of claim 6). 9A to 9F show an example of means for positioning the flanged steel member 7b.

  That is, FIG. 9A shows an embodiment in which the flanged steel member 7b is positioned by filling the caulking material 13a having elasticity in the vicinity of the opening of the sheath tube 10. FIG. A clearance is secured between the end surface of the flanged steel member 7b and the sheath tube 10. FIG. 9B shows an embodiment in which the flanged steel member 7b is positioned by filling the gap with a stretchable joint material or filler 13b. As the joint material or filler 13b, for example, sand, cement (mortar, etc.), resin (elastite), rubber, or the like is used. As shown in FIG. 9 (c), the gap 13 is filled with a filler 13b, an injection hole 17 is provided in the flanged steel member 7b, and the flanged steel member 7b is inserted into the flanged steel member 7b. Also, it is effective to carry out filling with a joint material or filler 6b having elasticity. FIG. 9D to FIG. 9F show an embodiment in which the flanged steel member 7 b is positioned by providing the flanged steel member 7 b with a fixed position 13 c. Incidentally, in the case of the embodiment shown in FIG. 9 (e), the insertion guide 13 c ′ of the 13 c fixed to the position is provided on the inner surface of the sheath tube 10.

  And as shown in FIG. 6, the beam 7 arrange | positioned to the head of the pillar material 8 in the river crossing direction is integrally connected by bolt joining. Finally, FIG. 7 shows a stage in which the lower end portion of the built-in column member 8 is embedded or fixed directly or into the foundation concrete 5 in which the sheath member 15 is placed. Incidentally, the sabo dam 1 shown in FIG. 10 is a basic concrete in which the sheath member 15 is placed when the lower end portion of the column 8 built at the bottom between the concrete dam bodies 2 and 2 is inserted into the sheath pipe 15. 5 shows an embodiment embedded in and fixed in 5.

  Therefore, according to the sabo dam and the construction method of the present invention, the beam member 7 is installed by inserting the end portion into the sheath tube 10 embedded in the concrete dam body 2 in advance. Between the end of the material 8 can be formed a slidable structure that can absorb the expansion and contraction of concrete, beam material 7 and column material 8, and it eliminates thermal stress and suppresses cracking of concrete. can do.

  Further, the end of the flanged steel member 7b into which the beam material 7 is divided is inserted into the sheath tube 10, and the remaining beam member 7a and the flanged steel member 7b are connected to assemble the beam material 7. Since it is completed and installed, the construction error of the beam material 7 can be absorbed sufficiently. Moreover, since the beam member 7 and the column 8 are detachable, the steel slit dam 6 can also be removed (disassembled) for removing the debris flow and driftwood after they have been captured. Therefore, not only the removal work is simplified, but also the steel slit dam 6 can be easily restored.

  Further, the beam member 7 is installed by inserting an end portion into the sheath pipe 10 embedded in the concrete dam body 2, and the beam member 7 and the head of the column member 8 are integrally connected. Since the lower end portion is a simple planar structure that is simply embedded and installed in the foundation concrete 5, the number of parts is small and the structure can be simplified. Further, since the work of constructing the concrete levee body 2 by placing concrete and the work of assembling the steel slit dam 6 composed of the beam material 7 and the column material 8 can be separated, the concrete dam body 2, 2 When installing the steel slit dam 6 between them, it is not necessary to ensure the safety of the steel slit dam 6, the construction can be greatly shortened, and the construction and economy are excellent.

  In addition, the both ends of the beam member 7 are not limited to the case of being inserted into the sheath tube 10 and installed. For example, a flanged steel member 7b obtained by dividing the beam material 7 in advance instead of the sheath tube 10 is embedded in one concrete dam body 2, and the flanged steel member 7b and the beam member 7a are connected to each other. 7 can also be carried out (the invention according to claim 7). The sabo dam 1 of this embodiment can also sufficiently absorb the construction error when the beam material 7 is installed on the concrete dam body 2. Of course, between the sheath 10 embedded in one concrete dam body 2 and the end portion of the beam member 7, there is a gap having a slidable structure capable of absorbing the expansion and contraction of the concrete, the beam member 7 and the column member 8. Since it is formed, the thermal stress can be eliminated and cracking of the concrete can be suppressed.

  Incidentally, the flanged steel member 7b embedded in the concrete dam body 2 is embedded in the concrete while being positioned by the fixing bracket 16 (invention of claim 8). 11A to 11D show an example of means for positioning the flanged steel member 7b. That is, FIG. 11A shows an embodiment in which an adjusted material 16a is provided and positioned between the concrete bank 2 and the flanged steel member 7b. FIG. 11B shows an embodiment in which reinforcing bars 16b (six in the illustrated example) are provided and positioned on both side surfaces of the flanged steel member 7b. FIG. 11C shows an embodiment in which fasteners 16c are provided and positioned on both side surfaces of the flanged steel member 7b. FIG. 11 (d) shows that a boxed concrete dam body 2 is inserted with a flanged steel member 7 b wound with a rubber sheet on the outer periphery, and mortar concrete 16 d is inserted into the gap between the concrete dam body 2 and the flanged steel member 7 b. Is shown, and the flanged steel member 7b is positioned.

  In the sabo dam 1 in FIG. 12, when the space between the concrete dam bodies 2 and 2 is wide, a concrete partition wall 18 is constructed at an intermediate position between the concrete dam bodies 2, and the concrete partition wall 18 and the concrete dam body 2 are interposed. The Example in which the steel slit dam 6 was installed is shown. The sabo dam 1 of this example is implemented by the same construction method as in Example 1 except that the concrete partition wall 18 in which the sheath pipe 10 or the steel member 7b with flange is embedded is constructed at the intermediate position of the concrete dam body 2. Is done.

  The sabo dam 1 shown in FIGS. 13 and 14 has a high dam height (steel height), a column 8 is long, and only one beam 7 prevents the boulders from flowing downstream. When it is insufficient, the beam member 7 having an end inserted into the sheath pipe 10 embedded in the concrete dam body 2 is also integrated with the column member 8 at an intermediate position in the height direction of the column member 8. FIG. 2 shows an embodiment in which the two are connected together. The sabo dam 1 of this embodiment has a downstream beam member 9 joined to the beam member 7 via a connecting member 11 on the downstream side of the beam member 7 of the steel slit dam 6 in plan view. The structure is a solid frame structure in which the end portion is inserted and fixed in the sheath pipe 10 embedded in the concrete dam body 2, and sufficient capture can be obtained even when subjected to strong impacts such as boulders or driftwood. Incidentally, the size of the steel slit dam 6 shown in FIG. 13 is about 7 to 8 m in height, about 6 to 8 m in width, and about 2 to 3 m in depth.

  When the dam height (steel height) is higher than the sabo dam 1 shown in FIG. 13 and the column 8 is longer, as shown in FIG. 15, a plurality of beams 7 and downstream beams are used. Of course, it is also possible to install the material 9 by the same construction method as in the embodiment shown in FIG. Incidentally, the size of the steel slit dam 6 shown in FIG. 15 is about 6 to 8 m in height, about 10 to 11 m in width, and about 2 to 3 m in depth.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the illustrated embodiments. As long as it does not deviate from the gist and technical idea of the present invention, it will be mentioned here that various embodiments can be realized according to modifications and applications of those skilled in the art.

It is a perspective view which shows the sabo dam according to this invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. It is a step figure which shows the construction procedure of the sabo dam according to the present invention. (A)-(d) is explanatory drawing which shows the means to position a sheath pipe with a fixing metal fitting. (A)-(f) is explanatory drawing which shows the means to position the steel member with a flange inserted in the sheath pipe. It is a perspective view which shows the sabo dam according to this invention. (A)-(d) is explanatory drawing which shows the means to position the steel member with a flange. It is a conceptual diagram which shows the sabo dam of Example 2. It is a perspective view which shows the sabo dam of Example 3. It is a longitudinal cross-sectional view of the sabo dam shown in FIG. It is a perspective view which shows different embodiment of the sabo dam of Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sabo dam 2 Concrete dam body 3 Concrete body body concrete 4 Sleeve concrete 5 Foundation concrete 6 Steel slit dam 7 Beam material 7a Beam member 7b Steel member with a flange 8 Column material 9 Downstream beam material 10 Sheath pipe 11 Connection Material 12a to 12d Fixing fitting for sheath tube 13a to 13c Positioning means for steel member with flange inserted into sheath tube 16a to 16d Positioning means for steel member with flange

Claims (12)

A sabo dam with a steel slit dam installed between concrete dams on both sides of the river,
The steel slit dam is made by joining the beam material arranged in the river crossing direction to the head of the pillar material built by burying the lower end part in the foundation concrete placed at the bottom between the concrete dam bodies,
In the concrete levee, a sheath pipe is embedded in the surface facing the river center.
The sabo dam, wherein the beam member is fixed by inserting an end portion thereof into the sheath pipe.   A downstream beam material joined to the beam material via a connecting material on the downstream side of the beam material of the steel slit dam in a plan view is inserted into a sheath pipe whose end is embedded in a concrete dam body. The sabo dam according to claim 1, wherein the sabo dam is fixed.   A plurality of beam members constituting the steel slit dam are provided in the height direction, and the ends of each beam member are inserted and fixed in a sheath pipe embedded in the surface of the concrete bank facing the river center. The sabo dam according to claim 1 or 2, wherein   The sabo dam according to any one of claims 1 to 3, wherein the sheath pipe embedded in the concrete bank is positioned by a fixing bracket and embedded in the concrete.   A flanged steel member obtained by dividing a beam material is inserted into a sheath pipe embedded in a concrete bank, and the beam material is installed by connecting the flanged steel member and the beam member. The sabo dam as described in any one of Claims 1-4.   The end portion of the beam member is positioned by filling a gap formed between the beam member and the sheath tube with a stretchable filler, or is positioned by a fixing metal fitting. The sabo dam as described in any one of -5.   The concrete dam body is pre-embedded with a steel member with a flange obtained by dividing a beam material instead of a sheath pipe, and the beam material is installed by connecting the steel member with the flange and the beam member. The sabo dam as described in any one of Claims 1-3.   The sabo dam according to claim 7, wherein the flanged steel member embedded in the concrete bank is positioned by a fixing means and embedded in the concrete.   The sabo dam according to claim 1, wherein a plurality of pillar members constituting the steel slit dam are built in the width direction.   The column material is fixed at the bottom of the concrete dam body by temporarily fixing the lower end of the column with an anchor, and is fixed directly to the cast concrete foundation, or the bottom of the concrete dam body using a sheath pipe The sabo dam according to claim 1 or 9, wherein the sabo dam is fixed to the foundation concrete in which the sheath pipe is installed. A method of constructing a sabo dam with a steel slit dam installed between concrete dams on both sides of the river,
Constructing a concrete levee in which a sheath pipe with an inner diameter slightly larger than the outer diameter of the beam material is embedded in the surface facing the river center;
Building a pillar material at the bottom between the concrete dams;
Insert the end of the flanged steel member into which the beam material is divided into the sheath pipe embedded in the concrete dam body, and connect the remaining divided beam member and the flanged steel member to complete the beam material. Installation stage,
The step of joining the beam members arranged in the river transverse direction to the heads of the pillar members;
A method for constructing a sabo dam, comprising the step of embedding and fixing a lower end portion of a pillar material built between concrete dam bodies into foundation concrete cast between the concrete dam bodies. Column material is fixed at the bottom between concrete dams by temporarily fixing the lower end of the column with anchors, and fixed directly to the cast concrete foundation, or at the bottom between concrete dams using a sheath pipe. The method for constructing a sabo dam according to claim 11, wherein the sheath pipe is fixed to the foundation concrete on which the sheath pipe is placed.

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