JP2017040074A - Housing type reinforcement member, and reinforcement method and reinforcement structure of flange joint part of steel slit dam using member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing type reinforcement member, and a reinforcement method and reinforcement structure of a flange joint part of a steel slit dam that uses the member, capable of preventing, as much as possible, opening or core deviation caused by impact boulder or the like, by enhancing shear resistance force and bending resistance force as well as protecting the flange joint part from direct hitting with boulder.SOLUTION: A housing type reinforcement member reinforces a flange joint part of flanged steel pipes constituting a steel slit dam provided between concrete banks on both sides of a river along a transversal direction. It includes a U-like groove that covers an entire circumference of the flange joint part, comprising a plurality of arc-like segments divided along a radial direction when viewed along a pipe axis direction of the steel pipe, and abutment jointing is made so as to cover the entire circumference of the flange joint part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a housing type reinforcing member for reinforcing a flange joint portion between flanged steel pipes constituting a steel slit dam provided between concrete dams on both sides of a river in the transverse direction, and steel using the same member. The present invention belongs to the technical field of reinforcing methods and reinforcing structures for flange joints of slit dams.

Well-known steel slit dams are installed between concrete dams on both sides of the river, and effectively capture boulders or driftwood and other driftwood as countermeasures against debris flow capture or driftwood capture. Yes.
This steel slit dam is also called a transmission-type sabo dam, etc., and until now, various shapes and structures have been disclosed and put into practice (for example, see Patent Documents 1 to 4).
The steel slit dam is constructed by three-dimensionally joining columns and beams made of steel pipe. In the joining means, the joint part of each block (part) manufactured in a size suitable for conveyance is a flanged steel pipe, the flanged steel pipes are butted together on the site, bolts are passed through the flange holes, and nuts are fastened. Are often used (see the drawings of Patent Documents 1 to 4).

JP 2002-188134 A JP 2013-204272 A JP 2009-127280 A JP 2009-24364 A

As described above, it is a flange joint frequently used when constructing a steel slit dam, but when implemented on the upstream side of the steel slit dam in particular, as shown in FIG. 8 and FIG. The flange joint opens or is misaligned (sliding) due to impact (directly hitting) on the joint or the middle part of the steel pipe (see the arrow in the figure), resulting in strength and rigidity ( There is a concern that it will fall sharply). Furthermore, there is a concern that other flange joints are adversely affected, and the steel slit dam itself collapses, so that the use is not possible.
Although Patent Document 1 discloses a joining means using a sheath pipe (36) as shown in FIG. 12, it is very excellent in mechanical joining that is easy to mount and remove and does not require skilled workers. There are currently no improved techniques for joining flanges.

  The present invention has been devised in view of the problems of the background art described above, and the purpose thereof is not only to protect the flange joint from direct hit of boulders, but also to provide shear resistance and bending resistance. By increasing the height, it is possible to prevent the opening due to the impact of boulders or misalignment as much as possible, and to realize a steel slit dam that has excellent stability and safety while maintaining strength and rigidity up to the specified service life. An object of the present invention is to provide a housing-type reinforcing member, a method for reinforcing a flange joint portion of a steel slit dam using the same member, and a reinforcing structure that can cope with a debris flow scale or an unexpected debris flow / boulder collision.

As a means for solving the above-mentioned problems, the housing-type reinforcing member according to the invention described in claim 1 is provided with flanged steel pipes constituting a steel slit dam provided between concrete bank bodies on both sides in a river transverse direction. A housing-type reinforcing member for reinforcing the flange joint portion of
A substantially U-shaped groove that covers the entire circumference of the flange joint portion is formed of a plurality of arc-shaped segments divided in the radial direction when viewed from the tube axis direction of the steel pipe, and covers the entire circumference of the flange joint portion. It is the structure butt-joined.

The housing-type reinforcing member according to the invention described in claim 2 is a housing-type reinforcing member that reinforces the flange joint portion between the flanged steel pipes that constitute the steel slit dam provided between the concrete bank bodies on both sides of the river in the transverse direction. A member,
A substantially U-shaped groove covering the entire circumference or a part of the flange joint is provided, and the flange joint is configured to be bolted to the flange joint using a flange hole of the steel pipe.

According to a third aspect of the present invention, in the housing-type reinforcing member according to the second aspect, the housing-type reinforcing member that covers the entire circumference of the flange joint portion is divided in the radial direction when viewed from the tube axis direction of the steel pipe. It is characterized by comprising a plurality of arc segments.
According to a fourth aspect of the present invention, in the housing-type reinforcing member according to the third aspect, the housing-type reinforcing member that covers the entire circumference of the flange joint portion includes a pair of arc-shaped segments. To do.
According to a fifth aspect of the present invention, in the housing-type reinforcing member according to the second aspect, the housing-type reinforcing member that covers the part of the flange joint portion is formed in an arc shape when viewed from the tube axis direction of the steel pipe. It is characterized by comprising one or a plurality of arc-shaped pieces.

According to a sixth aspect of the present invention, in the housing type reinforcing member according to any one of the second to fifth aspects, a portion to be bolted to the flange joint portion on both side surface portions forming the substantially U-shaped groove is other It is formed in the deep groove part long in radial direction seeing from the pipe-axis direction of the said steel pipe rather than this site | part.
According to a seventh aspect of the present invention, in the housing-type reinforcing member according to the sixth aspect, the deep groove portion is provided only at both ends in the circumferential direction when viewed from the tube axis direction of the steel pipe.

  The invention described in claim 8 is the housing-type reinforcing member according to any one of claims 1 to 5, wherein the substantially U-shaped groove uniformly covers a joining member such as a bolt used for flange joining between steel pipes. It is formed in a cross-sectional shape.

  The invention described in claim 9 is the housing-type reinforcing member according to any one of claims 1 to 8, wherein when the reinforcing rib is provided on the flange of the flanged steel pipe, the substantially U-shaped groove includes: A slit that does not interfere with the reinforcing rib is formed.

A method of reinforcing a flange joint portion of a steel slit dam according to the invention described in claim 10 is a flange between flanged steel pipes constituting the steel slit dam using the housing type reinforcing member according to claim 1. A method of reinforcing a joint,
After the flanges of the steel pipes to be joined are butted together and flange joined, a housing type reinforcing member consisting of a plurality of arc segments is applied to the flange joint, and the butted ends of adjacent arc segments are welded or The housing-type reinforcing member is fixed to the flange joint portion by joining with a bolt.

A method for reinforcing a flange joint portion of a steel slit dam according to the invention described in claim 11 is a flange constituting the steel slit dam using the housing-type reinforcing member according to any one of claims 2 to 9. It is a method of reinforcing the flange joint portion between the attached steel pipes,
After joining flanges of steel pipes to be joined and flange joining using flange holes other than the flange holes joining the housing type reinforcing member, the housing type reinforcing member is applied to the flange joining part, The housing type reinforcing member is fixed to the flange joint portion by bolting a bolt longer than the bolt to be used by using the flange hole for the housing type reinforcing member.

A method for reinforcing a flange joint portion of a steel slit dam according to the invention described in claim 12 is a flange in which the steel slit dam is configured by using the housing-type reinforcing member according to any one of claims 2 to 9. A method for reinforcing existing flange joints between steel pipes,
After removing the bolt joined to the flange hole for joining the housing-type reinforcing member in the existing flange joint, the housing-type reinforcing member is applied to the flange joint, and a bolt longer than the bolt is attached. The housing reinforcing member is fixed to the flange joint portion by bolting using the flange hole.

The flange structure of the flange joint portion of the steel slit dam according to the invention described in claim 13 is a flange constituting the steel slit dam using the housing type reinforcing member according to any one of claims 2 to 9. It is a structure that reinforces the flange joint between the attached steel pipes,
The flanges of the steel pipes to be joined are abutted and flanged using a flange hole other than the flange hole for joining the housing-type reinforcing member;
The housing type reinforcing member is applied to the flange joint part, and a bolt longer than the bolt used for the flange joint part is bolted using the flange hole for the housing type reinforcing member. The housing-type reinforcing member is fixed to the flange joint portion.

  According to a fourteenth aspect of the present invention, in the reinforcing structure of the flange joint portion of the steel slit dam according to the thirteenth aspect, the housing-type reinforcing member is disposed opposite to the upstream side and the downstream side of the flange joint portion. Is provided.

According to the present invention, the protective effect of the housing-type reinforcing member on the flange joint and the joint (clamping) effect not only protect the flange joint from direct hitting of boulders, but also reduce the shear resistance and bending resistance of the flange joint. Since it can raise, the opening by the impact of a boulder, etc. or misalignment can be prevented as much as possible.
As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.
According to the eighth aspect of the present invention, not only the flange joint portion but also the bolt and nut flange joint members can be protected, so that the opening due to the impact of boulders or misalignment can be further prevented.

FIG. 3A is a perspective view schematically showing an attachment mode of the housing-type reinforcing member according to the first embodiment to a flange joint portion, B is a side view thereof, and C is a flange-joined housing-type reinforcing member. It is the perspective view which showed the state attached to the part, D is the same front view. It is the side view which showed schematically the different attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 1. FIG. A is the perspective view which showed schematically the attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 2, B is the same side view, C is flange joining of a housing type reinforcement member. It is the front view which showed the state attached to the part, D is the front view which showed the housing type reinforcement member, E is the side view which showed the variation of the housing type reinforcement member. A is the side view which showed schematically the different attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 2, and B is the same front view. A is the perspective view which showed schematically the attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 3, B is the same side view, C is flange joining of the housing type reinforcement member. It is the front view which showed the state attached to the part, D is the front view which showed the housing type reinforcement member, E is the side view which showed the variation of the housing type reinforcement member. A is the perspective view which showed schematically the attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 4, B is the same side view, C is flange joining of a housing type reinforcement member It is the front view which showed the state attached to the part, D and E are the front views which showed the housing type reinforcement member, and F is the side view which showed the variation of the housing type reinforcement member. A is the perspective view which showed schematically the attachment aspect to the flange junction part of the housing type reinforcement member concerning Example 5, B is the same side view, C is flange joining of the housing type reinforcement member. It is the front view which showed the state attached to the part, D is the same top view, E, F is the front view which showed the housing type reinforcement member. A is a front view schematically showing a steel pipe joint structure of a steel slit dam according to the prior art, and B is a front view schematically showing a state in which a flange joint is opened due to impact of a boulder or the like. Yes, C is a front view schematically showing a state where the flange joint is misaligned due to the impact of a boulder or the like. A is a front view schematically showing a steel pipe joint structure of a steel slit dam according to the prior art, and B is a front view schematically showing a state in which a flange joint is opened due to impact of a boulder or the like. Yes, C is a front view schematically showing a state where the flange joint is misaligned due to the impact of a boulder or the like.

The present invention relates to a steel pipe joint structure with a flange of a steel slit dam provided between concrete dams on both sides of a river in the transverse direction. The flange joint portion is reinforced (strengthened), specifically in the following embodiments. In short, the flange joints (particularly the outer peripheral surface part and part of both side surfaces) are covered with a housing-type reinforcing member to protect against the direct impact of boulders, as well as the shear resistance and bending of the flange joints. It is based on a technical idea that increases resistance.
The housing-type reinforcing member is mainly made of metal, but can be made of resin as long as it has a required rigidity.

The dimensions of the housing-type reinforcing member are appropriately designed according to the size of the flange to be used, and the design is appropriately changed according to the size of the steel pipe that also uses the flange. The size (form) of the steel pipe to be used is appropriately changed according to the structural design, but generally has an outer diameter (φ) of about 400 to 600 mm and a plate thickness (t) of about 9 to 22 mm. Of course, it is preferable in terms of structural mechanics that the outer diameter and inner diameter (hollow cross-sectional shape) of the steel pipes 1 and 2 to be flange-joined are matched.
Based on the above, in this embodiment, as an example, the flanged steel pipe has an outer diameter of about 400 mm and a thickness of about 9 mm. As an example, the flange provided at the joining edge of the steel pipe has an outer diameter of about 600 mm and a thickness of about 36 mm. Therefore, the housing-type reinforcing member according to the present embodiment is, for example, a substantially U-shaped groove shape having a width that can cover a flange joint portion having a thickness of about 72 mm and a thickness (plate thickness) of about 9 to 16 mm. It is implemented with the form which has required strength and rigidity.

The housing-type reinforcing member according to the present invention may be attached to all the flange joints in the steel slit dam, or limited to important points (for example, the flange joint located on the upstream side). You may carry out by attaching. There are various implementation variations.
Embodiments will be described below with reference to the drawings.

As shown in FIGS. 1A to 1D, the housing-type reinforcing member according to the first embodiment is a steel pipe 1 with a flange that constitutes a steel slit dam (not shown) provided between concrete dams on both sides in a river transverse direction. 2 is a housing-type reinforcing member 10 (5, 6) that reinforces two flange joint portions F, and includes substantially U-shaped grooves 5a, 6a covering the entire circumference of the flange joint portion F. As seen from the tube axis direction, it is composed of a plurality (two in the illustrated example) of arc-shaped segments 5 and 6 divided in the radial direction and is butt-joined so as to cover the entire circumference of the flange joint F. ing.
Incidentally, reference numerals 3 and 4 in the figure indicate a pair of disk-shaped flanges protruding outward from the steel pipes 1 and 2, reference numeral 7 indicates a bolt used for flange joining, and reference numeral 8 indicates the same nut. An annular flange may be used instead of the disk-shaped flanges 3 and 4.

A disk-like flange 3 is fixed (fixed) to the joining edge of one flanged steel pipe 1 by welding (all-around welding) so that the steel pipe 1 and the core coincide with each other. Similarly, a disk-like flange 4 is fixed to the joining edge of the other flanged steel pipe 2 by welding so that the core of the steel pipe 2 coincides with the core.
The arc-shaped segments 5 and 6 constituting the housing-type reinforcing member 10 are implemented by a pair of configurations equivalent to halving an annular ring provided with substantially U-shaped grooves 5a and 6a in the inner diameter direction. The substantially U-shaped grooves 5a and 6a are formed in a shape that is substantially in close contact with the outer peripheral surface portion of the flange joint portion F and part of both side surfaces.

  Therefore, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted and flange-joined, the housing-type reinforcing member 10 composed of the arc-shaped segments 5 and 6 is applied to the flange joint portion F (FIG. 1A). , B), the arc-shaped segments 5 and 6 are substantially in close contact with the outer peripheral surface portion of the flange joint portion F, and covers the outer peripheral surface portion of the flange joint portion F and part of both side surfaces (in other words, the bolt 7 and the nut 8). (Exposed) (See FIGS. 1C and 1D). Then, the arc-shaped segments 5 and 6 (housing type reinforcing member 10) are fixed to the flange joint portion F by welding and joining the butted portions of the arc-shaped segments 5 and 6.

  According to the housing-type reinforcing member 10 having the above-described configuration, the flange joint portion F is protected from the direct impact of boulders by the protective effect and the joining (holding) effect of the housing type reinforcement member 10 with respect to the flange joint portion F. Since the shear resistance and bending resistance of F can be increased, it is possible to prevent opening due to impact of a boulder or misalignment as much as possible. As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.

In this embodiment, the housing-type reinforcing member 10 is constituted by the two arc-shaped segments 5 and 6, but a combination of three or more arc-shaped segments can be similarly implemented. The plurality of arc-shaped segments need only be in a form that can be formed in an annular shape in a state of being in contact with each other, and can of course be implemented even in combinations having different circumferential lengths.
Further, in the present embodiment, the arc-shaped segments 5 and 6 are integrated by welding, but the present invention is not limited to this, and as shown in FIG. These arc-shaped segments 5 ′ and 6 ′ can be abutted with each other, and can be integrated by bolting using bolt through holes provided in the butted flanges.

  The housing type reinforcing member 20 (15, 16) according to the second embodiment (FIG. 3) is configured to be fixed to the flange joint F using the flange holes of the flanged steel pipes 1, 2 as compared with the first embodiment. The difference is that it is implemented. Since the other components are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

  That is, the housing type reinforcing member 20 (15, 16) according to the second embodiment includes substantially U-shaped grooves 15a, 16a covering the entire circumference of the flange joint portion F, as shown in FIGS. It is implemented in a configuration in which the flange joint portion F is bolted using the flange holes of the steel pipes 1 and 2.

The housing-type reinforcing member 20 is composed of a plurality (two in the illustrated example) of arc-shaped segments 15 and 16 divided in the radial direction when viewed from the tube axis direction of the steel pipes 1 and 2.
The arc-shaped segments 15 and 16 are implemented by a pair of configurations equivalent to halving a substantially annular ring provided with substantially U-shaped grooves 15a and 16a in the inner diameter direction. The substantially U-shaped grooves 15a and 16a are formed in a shape that is substantially in close contact with the outer peripheral surface portion of the flange joint portion F and part of both side surfaces.
Further, the arc-shaped segments 15 and 16 are parts (between both ends in the illustrated example) 15b and 16b that are bolted to the flange joints F on the both side surfaces forming the substantially U-shaped grooves 15a and 16a. In contrast, the steel pipes 1 and 2 are formed in deep grooves that are longer in the radial direction when viewed from the pipe axis direction. The shape of the deep groove portions 15b and 16b is not particularly limited, and for example, the shape shown in FIG.

  Therefore, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted and flange joining is performed using a flange hole other than the flange hole for joining the housing-type reinforcing member 20 (15 and 16), the flange joining is performed. When the housing-type reinforcing member 20 (15, 16) is applied to the portion F (see FIG. 3A), the arc-shaped segments 15, 16 are substantially in close contact with the outer peripheral surface portion of the flange joint portion F, and the outer peripheral surface portion of the flange joint portion F And a part of both side surfaces are covered (see FIG. 3B). Thereafter, the bolt through holes provided in the deep groove portions 15 b and 16 b at both circumferential ends of the arc-shaped segments 15 and 16 are aligned with the corresponding flange holes, and the bolts 17 longer than the bolts 7 are passed through. The housing type reinforcing member 20 is fixed to the flange joint portion F by fastening with the nut 8 and bolting.

  According to the housing-type reinforcing member 20 having the above-described configuration, the flange-type reinforcing member 20 is protected from the direct impact of boulders by the protective effect and the connecting effect of the housing-type reinforcing member 20 with respect to the flange-joined portion F, and the shearing of the flange-joined portion F is performed. Since resistance force and bending resistance force can be increased, it is possible to prevent opening due to impact of a boulder or misalignment as much as possible. As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.

In this embodiment, the housing-type reinforcing member 20 is constituted by the two arc-shaped segments 15 and 16, but a combination of three or more arc-shaped segments can be similarly implemented. The plurality of arc-shaped segments need only be in a form that can be formed in an annular shape in a state of being in contact with each other, and can of course be implemented even in combinations having different circumferential lengths.
Further, the arc-shaped segments 15 and 16 according to the present embodiment are formed in the deep groove portions 15b and 16b only at both ends in the circumferential direction. However, the present invention is not limited to this, and as shown in FIGS. It can also be implemented using arcuate segments 15 ′ and 16 ′ formed in deep grooves having a uniform cross-sectional shape over the entire direction. In this case, only the long bolts 17 (eight in the illustrated example) are used for the flange joining.
That is, according to the embodiment shown in FIG. 4, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are brought into contact with each other, the arc-shaped segments 15 ′ and 16 ′ are flange-joined without performing so-called flange joining. The housing-type reinforcing member 20 is joined to the flange by attaching two long bolts 17 to each end (or even one). It fixes to the part F and implements.
According to the embodiment shown in FIG. 4, the arc-shaped segments 15 ′ and 16 ′ tightly restrain the flange joint portion F, so that an effect equivalent to so-called flange joint can be exhibited. Therefore, in addition to the above-described effects (see paragraph [0031]), it is possible to save the number of bolt members and joining work, which is efficient and economical.

  The housing-type reinforcing member 30 (25, 26) according to the third embodiment (FIG. 5) is implemented in a configuration that covers a part of the flange joint portion F, rather than the entire circumference, as compared with the second embodiment. The point is different. Since the other components are the same as those in the second embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

  That is, the housing-type reinforcing member 30 (25, 26) according to the third embodiment has a substantially U-shaped groove 25a that covers a part of the entire circumference of the flange joint portion F as shown in FIGS. , 26a, and one or a plurality (in the illustrated example, a pair) of arc-shaped pieces 25, 26 formed in an arc shape when viewed from the tube axis direction of the steel pipes 1, 2, and the steel pipes 1, 2 It is carried out by the structure joined to the said flange junction part F using the flange hole of this.

  The substantially U-shaped grooves 25a and 26a are formed in a shape that is substantially in close contact with the outer peripheral surface portion of the flange joint portion F and a part of both side surfaces, similarly to the substantially U-shaped grooves described in the first and second embodiments. ing. In addition, the arc-shaped pieces 25 and 26 are provided with parts (both ends in the illustrated example) 25b and 26b that are bolted to the flange joints F on both side surfaces forming the substantially U-shaped grooves 25a and 26a. In contrast, the steel pipes 1 and 2 are formed in deep grooves that are longer in the radial direction when viewed from the pipe axis direction. The shape of the deep groove portions 25b and 26b is not particularly limited, and for example, the shape shown in FIG.

  Therefore, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted and flange joining is performed using a flange hole other than the flange hole for joining the housing type reinforcing member 30 (25 and 26), the flange joining is performed. When the housing-type reinforcing member 30 (25, 26) is applied to the portion F in an arrangement facing the central portion (upstream side and downstream side thereof) in the illustrated example (see FIG. 5A), the outer periphery of the flange joint portion F The arc-shaped pieces 25 and 26 are substantially in close contact with the surface portion and cover the outer peripheral surface portion of the flange joint portion F and part of both side surfaces (see FIG. 5B). Thereafter, the bolt through holes provided in the deep groove portions 25 b and 26 b at both ends in the circumferential direction of the arc-shaped pieces 25 and 26 are aligned with the corresponding flange holes, and the bolts 17 longer than the bolts 7 are passed through. The housing type reinforcing member 30 is fixed to the flange joint portion F by fastening with the nut 8 and bolting.

  According to the housing-type reinforcing member 30 having the above-described configuration, the flange-type reinforcing member 30 is protected from the direct impact of boulders by the protective effect and the joining effect of the housing-type reinforcing member 30 with respect to the flange-joined part F, and the shear of the flange-joined part F Since resistance force and bending resistance force can be increased, it is possible to prevent opening due to impact of a boulder or misalignment as much as possible. As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.

In the present embodiment, the housing-type reinforcing member 30 is constituted by the two arc-shaped pieces 25 and 26, but the same can be implemented by combining one or three or more arc-shaped pieces. When implemented with the one arcuate piece, it is carried out by attaching it to the upstream portion of the flange joint F.
Further, the arc-shaped pieces 25 and 26 according to the present embodiment are formed in the deep groove portions 25b and 26b only at both ends in the circumferential direction, but are not limited to this, and are the same as the embodiment of FIG. 4 with respect to FIG. Moreover, it can also be implemented using an arc-shaped piece (not shown) formed in a deep groove portion having a uniform cross-sectional shape over the entire circumferential direction. In this case, only the long bolt 17 is used as the bolt used for flange joining.
Specifically, as in the embodiment of FIG. 4, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted, the arc-shaped piece is joined to the flange joint portion without performing so-called flange joining. The front and rear side portions of F are closely contacted and positioned without substantial gaps, and a total of eight long bolts 17 in the arc-shaped circumferential direction (or a total of four bolts, one at each end). This can also be performed). The housing-type reinforcing member 30 is fixed to the flange joint portion F by joining.
According to this embodiment, since the arc-shaped piece formed in the deep groove portion having the uniform cross-sectional shape strictly restrains the flange joint portion F, an effect equivalent to the so-called flange joint can be exhibited. Therefore, in addition to the above-described effects (see paragraph [0037]), it is possible to save the number of bolt members and the joining work, which is efficient and economical.

  The housing-type reinforcing member 40 (35, 36) according to the fourth embodiment (FIG. 6) has a substantially U-shaped groove wider than the second embodiment (FIG. 3) and a deep groove in the entire circumferential direction. Therefore, it is different in that the bolt 7 and the nut 8 used in the flange joint F are also protected. Since the other components are the same as those in the second embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

  That is, the housing-type reinforcing member 40 (35, 36) according to the fourth embodiment covers the entire circumference of the outer peripheral surface of the flange joint portion F as shown in FIGS. Provided with substantially U-shaped grooves 35a and 36a having a uniform cross-sectional shape having a width and a depth that can cover the joining members (bolts 7 and nuts 8) used in It is implemented with a configuration in which the flange joint portion F is used to be bolted.

The housing-type reinforcing member 40 includes a plurality (two in the illustrated example) of arc-shaped segments 35 and 36 divided in the radial direction when viewed from the tube axis direction of the steel pipes 1 and 2.
The arc-shaped segments 35 and 36 are implemented by a pair of configurations equivalent to halving a substantially annular ring provided with substantially U-shaped grooves 35a and 36a in the inner diameter direction.
Further, the arc-shaped segments 35 and 36 are bolted to the inner side surface portions of the portions (both ends in the circumferential direction in the illustrated example) that are bolted to the flange joint portions F on both side surface portions that form the substantially U-shaped grooves 35a and 36a. The spacers 35b and 36b are provided by welding in advance as the necessary spacing members. In place of the spacers 35b and 36b, washers 35b 'and 36b' shown in FIG.

  Therefore, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted and flange joining is performed using a flange hole other than the flange hole for joining the housing type reinforcing member 40 (35, 36), the flange joining is performed. When the housing-type reinforcing member 40 (35, 36) is applied to the portion F (see FIG. 6A) and the flange joint portion F is sandwiched and positioned by the spacers 35b, 36b, the arc-shaped segments 35, 36 become the flange joint portion. It is hung to F by the structure which covers the joining members, such as the volt | bolt 7, etc. (refer FIG. 6B). Thereafter, the bolt through-holes provided at both ends in the circumferential direction of the arc-shaped segments 35 and 36 are aligned with the corresponding flange holes, and fastened with the nut 8 through the bolt 27 longer than the bolts 7 and 17. Then, the housing-type reinforcing member 40 is fixed to the flange joint portion F by bolting.

  According to the housing-type reinforcing member 40 having the above-described configuration, the flange joint portion F is protected from the direct hit of boulders by the protective effect and the joint effect of the housing-type reinforcing member 40 with respect to the flange joint member such as the flange joint portion F and the bolt 7. Of course, since the shear resistance and bending resistance of the flange joint F can be increased, it is possible to prevent the opening due to the impact of a boulder or misalignment as much as possible. As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.

  In this embodiment, the housing-type reinforcing member 40 is constituted by the two arc-shaped segments 35 and 36, but a combination of three or more arc-shaped segments can be similarly implemented. The plurality of arc-shaped segments need only be in a form that can be formed in an annular shape in a state of being in contact with each other, and can of course be implemented even in combinations having different circumferential lengths.

  The housing-type reinforcing member 50 (45, 46) according to the fifth embodiment (FIG. 7) is implemented in a configuration that covers a part of the flange joint F rather than the entire circumference, as compared with the fourth embodiment. The point is different. Since the other components are the same as those in the fourth embodiment, the same reference numerals are given and the description thereof is omitted as appropriate.

  That is, the housing-type reinforcing member 50 (45, 46) according to the fifth embodiment has a substantially U-shaped groove 45a covering a part of the entire circumference of the flange joint portion F as shown in FIGS. 46a, one or a plurality (in the illustrated example, one pair) of arc-shaped pieces 45, 46 formed in an arc shape when viewed from the tube axis direction of the steel pipes 1, 2, and the steel pipes 1, 2 It is carried out by the structure joined to the said flange junction part F using the flange hole of this.

The substantially U-shaped grooves 45a and 46a cover the entire circumference of the outer peripheral surface of the flange joint portion F as well as the flange joint portion F in the same manner as the substantially U-shaped grooves 35a and 36b described in the fourth embodiment. It forms and implements in the uniform cross-sectional shape which has the width dimension and depth dimension which can cover the used joining member (bolt 7 and nut 8).
Further, the arc-shaped pieces 45 and 46 are bolted to the inner side surface portions of the portions (both ends in the circumferential direction in the illustrated example) that are bolted to the flange joint portions F on both side surface portions forming the substantially U-shaped grooves 45a and 46a. Spacers 45b and 46b are previously welded and provided as spacing maintaining members necessary at this time. Instead of the spacers 45b and 46b, a washer (refer to FIG. 6F) can be used in the same manner.

  Therefore, after the flanges 3 and 4 of the steel pipes 1 and 2 to be joined are abutted and flange joining is performed using a flange hole other than the flange hole for joining the housing type reinforcing member 50 (45, 46), the flange joining is performed. The housing-type reinforcing member 50 (45, 46) is applied to the portion F in the illustrated example so as to face the central portion (the upstream side and the downstream side thereof) (see FIG. 7A), and the spacers 45b, 46b are flanged. When the joint portion F is sandwiched and positioned, the arc-shaped pieces 45 and 46 are hung on the flange joint portion F so as to cover the joint member such as the bolt 7 (see FIG. 7B). Thereafter, the bolt through holes provided at both ends in the circumferential direction of the arc-shaped pieces 45 and 46 are aligned with the cores of the corresponding flange holes, and fastened with the nut 8 through the bolts 27 longer than the bolts 7 and 17. Then, the housing-type reinforcing member 50 is fixed to the flange joint portion F by bolting.

  According to the housing-type reinforcing member 50 having the above-described configuration, the flange joint portion F can be protected from the direct hit of boulders by the protective effect and the joint effect of the housing-type reinforcing member 50 with respect to the flange joint member such as the flange joint portion F and the bolt 7. Of course, since the shear resistance and bending resistance of the flange joint F can be increased, it is possible to prevent the opening due to the impact of a boulder or misalignment as much as possible. As a result, a steel slit dam with excellent stability and safety that retains strength and rigidity up to the specified service life can be realized, and it can cope with the recent debris flow scale and unexpected debris flow and boulder collisions. it can.

  In the present embodiment, the housing-type reinforcing member 50 is constituted by the two arc-shaped pieces 45 and 46. However, the present invention can be similarly implemented by combining one or three or more arc-shaped pieces. When implemented with the one arc-shaped piece, it is carried out by being attached to the upstream portion of the flange joint F.

  Although the embodiments have been described with reference to the drawings, the present invention is not limited to the illustrated examples and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case.

  For example, when the flanged steel pipes 1 and 2 are provided with reinforcing ribs (not shown) for reinforcing the flanges 3 and 4, the housing-type reinforcing member 10 (20, 30, 40, 50) A slit is formed so as not to interfere with the reinforcing rib.

Moreover, this invention is applicable also to the flange junction part of the existing steel slit dam.
Specifically, when the housing-type reinforcing member 10 according to the first embodiment is used, it can be applied as it is.
When using the housing type reinforcement members 20 to 50 according to the above Examples 2 to 5, the housing type reinforcement members 20 to 50 in the existing flange joint part (refer to the flange joint part F in FIG. 1A) are used. After removing the bolts 7 joined to the flange holes to be joined, the housing-type reinforcing members 20 to 50 are applied to the flange joints F in the same manner as described in the above embodiments 2 to 5, respectively. This is performed by fixing the housing reinforcing members 20 to 50 to the flange joint portion F by bolting the bolts 17 or 27 longer than the bolts 7 using the corresponding flange holes.

  As a precaution, the housing-type reinforcing members 10 to 50 according to the illustrated example are applied to the flange joint portion F including the two flanges 3 and 4 that are abutted to each other. However, the present invention is not limited to this. The present invention can be similarly applied to a flange joint portion in which three or more flanges are overlapped by using an inner sleeve provided with an external flange.

DESCRIPTION OF SYMBOLS 1 Steel pipe with a flange 2 Steel pipe with a flange 3 Disc-shaped flange 4 Disc-shaped flange 5 Arc-shaped segment 5a Almost U-shaped groove 5 'Arc-shaped segment 6 Arc-shaped segment 6a Almost U-shaped groove 6' Arc-shaped segment 7 Bolt 8 Nut DESCRIPTION OF SYMBOLS 10 Housing type reinforcement member 15 Arc-shaped segment 15a Substantially U-shaped groove 15b Deep groove part 15 'Arc-shaped segment 16 Arc-shaped segment 16a Substantially U-shaped groove 16b Deep groove part 16' Arc-shaped segment 17 Long bolt 20 Housing type reinforcement member 25 Arc-shaped piece 25a substantially U-shaped groove 25b deep groove portion 26 arc-shaped piece 26a substantially U-shaped groove 26b deep groove portion 27 long bolt 30 housing type reinforcing member 35 arc-shaped segment 35a substantially U-shaped groove 35b spacer 35b 'washer 36 arc shape Segment 36a Substantially U-shaped groove 36b Spacer 6b 'washer 40 housing shaped reinforcing member 45 arcuate pieces 45a substantially U-shaped groove 45b spacers 46 arc-shaped piece 46a substantially U-shaped groove 46b spacers 50 housing shaped reinforcing member F flange joint

Claims (14)

A housing-type reinforcing member that reinforces a flange joint between flanged steel pipes that constitute a steel slit dam provided between concrete dams on both sides of a river in the transverse direction,
A substantially U-shaped groove that covers the entire circumference of the flange joint portion is formed of a plurality of arc-shaped segments divided in the radial direction when viewed from the tube axis direction of the steel pipe, and covers the entire circumference of the flange joint portion. A housing-type reinforcing member, characterized by being configured to be butt-joined. A housing-type reinforcing member that reinforces a flange joint between flanged steel pipes that constitute a steel slit dam provided between concrete dams on both sides of a river in the transverse direction,
A housing-type reinforcement comprising a substantially U-shaped groove covering the entire circumference or a part of the flange joint, and being bolted to the flange joint using a flange hole of the steel pipe Element.   The housing-type reinforcing member that covers the entire circumference of the flange joint portion is composed of a plurality of arc-shaped segments divided in the radial direction when viewed from the tube axis direction of the steel pipe. The housing-type reinforcing member described.   The housing-type reinforcing member according to claim 3, wherein the housing-type reinforcing member that covers the entire circumference of the flange joint portion includes a pair of arc-shaped segments.   The housing-type reinforcing member that covers the part of the flange joint part is configured by one or a plurality of arc-shaped pieces formed in an arc shape when viewed from the tube axis direction of the steel pipe, A housing-type reinforcing member according to claim 2.   The part to be bolted to the flange joint part on both side surface parts forming the substantially U-shaped groove is formed in a deep groove part that is longer in the radial direction than the other part in the tube axis direction of the steel pipe. The housing type reinforcing member according to any one of claims 2 to 5.   The said deep groove part is provided only in the circumferential direction both ends seeing from the pipe-axis direction of the said steel pipe, The housing type reinforcement member of Claim 6 characterized by the above-mentioned.   The said substantially U-shaped groove | channel is formed in the uniform cross-sectional shape which covers joining members, such as a volt | bolt used for the flange joining of steel pipes, The housing type | mold as described in any one of Claims 1-5 characterized by the above-mentioned. Reinforcing member.   9. The slit according to claim 1, wherein when the reinforcing rib is provided on the flange of the flanged steel pipe, a slit that does not interfere with the reinforcing rib is formed in the substantially U-shaped groove. A housing-type reinforcing member according to any one of the above. A method for reinforcing flange joints between flanged steel pipes constituting the steel slit dam using the housing-type reinforcing member according to claim 1,
After the flanges of the steel pipes to be joined are butted together and flange joined, a housing type reinforcing member consisting of a plurality of arc segments is applied to the flange joint, and the butted ends of adjacent arc segments are welded or A method of reinforcing a flange joint portion of a steel slit dam, wherein the housing-type reinforcing member is fixed to the flange joint portion by joining with a bolt. A method for reinforcing flange joints between flanged steel pipes constituting the steel slit dam using the housing-type reinforcing member according to any one of claims 2 to 9,
After joining flanges of steel pipes to be joined and flange joining using flange holes other than the flange holes joining the housing type reinforcing member, the housing type reinforcing member is applied to the flange joining part, A steel slit dam characterized in that a bolt longer than a bolt to be used is bolted using a flange hole for the housing type reinforcing member to fix the housing type reinforcing member to a flange joint portion. Reinforcing method for flange joints. A method for reinforcing existing flange joints between flanged steel pipes that constitute the steel slit dam using the housing-type reinforcing member according to any one of claims 2 to 9,
After removing the bolt joined to the flange hole for joining the housing-type reinforcing member in the existing flange joint, the housing-type reinforcing member is applied to the flange joint, and a bolt longer than the bolt is attached. A method for reinforcing a flange joint portion of a steel slit dam, wherein the housing reinforcing member is fixed to the flange joint portion by bolting using the flange hole. A structure in which a flange joint portion between flanged steel pipes constituting the steel slit dam is reinforced using the housing-type reinforcing member according to any one of claims 2 to 9,
The flanges of the steel pipes to be joined are abutted and flanged using a flange hole other than the flange hole for joining the housing-type reinforcing member;
The housing type reinforcing member is applied to the flange joint part, and a bolt longer than the bolt used for the flange joint part is bolted using the flange hole for the housing type reinforcing member. A reinforcing structure for a flange joint portion of a steel slit dam, wherein a housing-type reinforcing member is fixed to the flange joint portion.   The reinforcing structure of a flange joint portion of a steel slit dam according to claim 13, wherein the housing-type reinforcing member is provided so as to face the upstream side and the downstream side of the flange joint portion. .

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