JP6544966B2 - Joint structure of circular steel pipe for transmission type levee, sheath pipe joint used for the joint structure, and transmission type dam using the joint structure - Google Patents

Description

  The present invention relates to a transmission-type dam, and more particularly, to a joint structure of circular steel pipes used for the transmission-type dam, a sheathed pipe joint used for the connection structure, and a transmission-type dam using the connection structure.

  Sabo dams are dams installed in mountain streams to prevent disasters due to debris flow and driftwood, and transmission-type (sabo) dams are used to block harmful debris flow such as driftwood and debris, and always harmless as well. It is a levee with the function of flowing running water, sediment, etc. downstream. In such a transmission-type dam, while providing a water flow section that regularly opens flowing water, sediments, etc. downstream to the levee body, a slit dam that can stop debris flow and install water is installed there . The slit dam is generally a steel slit dam made of steel for strength and economical reasons. In addition, it is difficult to predict from which upstream direction driftwood or earthstone to be dammed collides with the embankment for steel materials used for such a transmission type embankment, so it is difficult to determine the impact load from which direction. In many cases, circular steel pipes with constant strength are used.

  Conventionally, as shown in Patent Document 1, flange connection in which flanges are abutted and bolted together is used for joining circular steel pipes constituting such a transmission type dam, and circular steel pipes used for transmission dams are used. Bonding is still in a situation where nearly 40 years have passed since this application and no new bonding means are provided even today (see FIG. 4 of the drawing of Patent Document 1, etc.). Such flange connection is advantageous in that the construction at the installation site is easy and the variation in strength due to construction errors is small.

  However, it is necessary to make the upstream side or the upstream and downstream sides of the circular steel pipe which is the main structure slope in order to resist external load such as impact load such as debris flow, water pressure, earth pressure (sedimentation pressure) The joint between the circular steel pipes is a joint which crosses at an angle other than a right angle. For this reason, when it is selected to join the flanges perpendicular to the axis of the circular steel pipe at the site where the transmission type dam is installed, the angle which is not a right angle between the circular steel pipes as the main structure, That is, it is necessary to perform sharp or obtuse welding at a factory or the like. Bonding of round steel pipes with each other at an acute angle or at an obtuse angle may be considered by wet jointing with concrete or the like, but generally, a curing period or the like is unnecessary, and welding is performed so as to enable nondestructive inspection.

  When performing welding of acute angle or obtuse angle of circular steel pipes by welding, it is necessary to cut the circular steel pipe with a three-dimensional curve at the joint portion, and the welding lines thereof are similarly curved (for example, cubic curves) It will be complicated. Moreover, the circular steel pipe, which is the main structure of the transmission-type dam, is a huge steel pipe having a length of usually 3 m to 13 m, and it is very difficult to rotate the circular steel pipe according to the progress of welding. For this reason, in the case where welding is performed by joining the circular steel pipes constituting the transmission type dam by intersection, it is necessary to cut the circular steel pipe by a complicated three-dimensional curve and to perform a complete penetration welding operation in an upward posture or the like. As a result, it becomes a difficult task that only highly skilled and limited craftsmen can carry out, and inevitably there is a problem that it becomes expensive and the yield also deteriorates.

  On the other hand, according to Patent Document 2, when a large portion collides with the steel support 15 and a recessed portion is formed, the steel constituting the transmission-type sand protection barrier 10 as a reinforcing structure for repairing and reinforcing the recessed portion A support member 15; a buffer member 21 covering at least a part of the steel support column 15 on the upstream side; and a fixing member 31 connected to the impact member 21 to fix the buffer member 21 to the steel support 15. A reinforcing structure of the transmission-type sabo dam 10 is disclosed (see claim 1 of Patent Document 2, paragraphs [0039] to [0049] of the specification, FIG. 3 etc. of the drawings).

  However, the reinforcing structure described in Patent Document 2 is a reinforcing structure of steel columns to the last, and can be applied to the bonding of steel columns, that is, to the bonding of circular steel pipes serving as main structures. There was a problem that it was impossible.

  Further, in Patent Document 3, a pillar member of a steel slit dam (transmission type dam) joined by a wet sheath pipe joint in which the joint between the pillar members 8 is joined with a sheath pipe 36 via a time-hardening material 24. The junction structure of is disclosed (see, eg, FIG. 15 of Patent Document 3).

  However, the joint structure of the column members of the steel slit dam described in Patent Document 3 is joined by a so-called wet sheath pipe joint which hardens and hardens the time-hardenable material 24 by taking a curing period, Since the curing period for curing the hardenable material is required, the installation period of the steel slit dam is extended, which causes a problem that the construction cost of the steel slit dam increases.

Japanese Utility Model Publication No. 51-58536 JP, 2011-226113, A JP 2002-188134 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to construct a transmission type dam while being easy and inexpensive to manufacture in advance in a factory etc. To provide a joint structure of circular steel pipe for transmission type embankment where connection work in a field can be carried out easily and in a short time, a sheath pipe joint used for the joint structure, and a transmission type dam using the joint structure. It is in.

The joint structure of circular steel pipes for transmission type dams according to the first invention is a joint structure of circular steel pipes for transmission type embankment in which the circular steel pipes constituting the transmission type dam are crossed and joined, and a plurality of the circular steel pipes The intersection portion of the pipe is externally fitted to a sheath pipe joint consisting of a plurality of pipes having a diameter that is externally fitted to the circular steel pipe, and the circular steel pipes are joined to each other. A stress transmission mechanism is provided that is fitted to one of the circular steel pipes and transmits stress to the other circular steel pipes that cross, and an impact load or the like acting on one of the circular steel pipes via the stress transmission mechanism. And the stress transfer mechanism is integrated with the sheath joint so as to abut on the end face of the other intersecting circular steel pipe . It is characterized by

  In the joint structure of a circular steel pipe for transmission-type levee according to a second invention, in the first invention, the sheath pipe joint is inserted so as to penetrate one of the plurality of circular steel pipes intersecting at the intersection portion It is characterized in that it is fitted to a portion excluding the end of the circular steel pipe.

  In the joint structure of a circular steel pipe for transmission-type levee according to a third invention, in the first invention or the second invention, the stress transfer mechanism is constituted by a plate material abutting on the end face of another intersecting circular steel pipe. And a stress transfer plate.

  In the joint structure of a circular pipe for transmission-type levee according to a fourth invention, in the invention according to any one of the first to third inventions, the sheath-tube joint is composed of a plurality of cylindrical members which can be assembled or disassembled. It is characterized by

  According to a fifth aspect of the present invention, in the joint structure of circular steel pipe for transmission type levee, in the fourth aspect, the cylindrical member is formed with a countersunk portion for receiving a screw head or a nut in a screwing portion. Do

  In the joint structure of circular steel pipe for transmission type levee according to the sixth invention, in the fourth invention or the fifth invention, the sheath pipe joint is used in the crossing portion where the circular steel pipes intersect at right angles, and the circular It is characterized by having a cylindrical member of a common shape used in any case where the steel pipes are used at intersections where acute angles or obtuse angles intersect.

  The joint structure of a circular steel pipe for transmission type dams according to a seventh invention is the invention according to any one of the fourth to sixth inventions, wherein the sheath pipe joint is fitted to the circular steel pipe to which the sheath pipe joint is fitted. It is characterized in that a positioning flange for determining a position to be fitted is formed.

  The joint structure of a circular steel pipe for transmission-type levee according to an eighth invention is characterized in that, in the invention of any of the first invention to the third invention, the sheath-tube joint is integrally molded from metal by casting or welding. I assume.

  The joint structure of a circular steel pipe for transmission-type levee according to a ninth aspect of the present invention is the joint according to the eighth aspect, wherein the sheath pipe joint is jointed so that a plurality of the circular steel pipes intersect the fitted circular steel pipe The plurality of circular steel pipes intersecting with the fitted circular steel pipe may be joined to cross at different heights.

  The joint structure of a circular steel pipe for transmission-type levee according to a tenth invention is the joint according to the eighth invention, wherein the sheath pipe joint is so joined that the plurality of circular steel pipes intersect the fitted circular steel pipe The plurality of circular steel pipes intersecting the fitted circular steel pipe may be joined to intersect at the same height.

  The joint structure of a circular steel pipe for transmission type levee according to the eleventh invention is the invention according to any of the eighth invention to the tenth invention, wherein the sheath pipe joint is attached to the circular steel pipe to which the sheath pipe joint is fitted. It is characterized in that a retrofit retrofit flange is attached which determines the position of fitting.

  A sheath-and-tube joint according to a twelfth aspect of the present invention is a sheath-and-tube joint used for the joint structure of the circular steel pipe for transmission type levee according to any one of claims 1 to 11, characterized by comprising the stress transfer mechanism. Do.

  A transmission type dam according to a thirteenth aspect of the invention is characterized by comprising the joint structure of the circular type steel pipe for transmission type embankment according to any one of claims 1 to 11.

  According to the first to thirteenth inventions, it is not necessary to directly weld the joint portions of huge circular steel pipes, so that manufacture in a factory or the like in advance is easy and manufacturing cost can be reduced. In addition, the connection work at the construction site of the transmission type dam is that the circular steel pipe is inserted into the sheath pipe joint and only the simple work such as screwing is performed, and the construction work of the transmission type dam is simple and short Will be able to Therefore, the installation cost of the transmission-type dam can be further reduced.

  In particular, according to the fourth aspect of the invention, since the sheath-and-tube joint is composed of a plurality of cylindrical members that can be assembled or disassembled, cutting and welding operations of complex circular steel pipes in a factory etc. in advance are minimized. In addition, the connection work at the construction site of the transmission type dam can be performed by a simple work such as screwing and can be performed in a short time.

  In particular, according to the fifth aspect of the invention, since the countersunk part for accommodating the screw head or the nut is formed in the cylindrical member constituting the sheath joint, the collar collides with the screw head or the nut It is possible to prevent the nut from flying and the joint of the circular steel pipe from collapsing.

  In particular, according to the sixth aspect of the present invention, since a part of the parts constituting the sheath pipe joint can be made common, it is possible to reduce the number of press molds and the production line, and also enjoy the merit of scale it can.

  In particular, according to the seventh invention, since the positioning flange is formed on the circular steel pipe, the sheath pipe joint may be dislocated, or the joint position and height of the circular steel pipes at the site where the transmission type dam is constructed. There is no risk of mistakes. Therefore, according to the seventh aspect of the present invention, the construction work of the transmission type dam can be performed easily and in a short time without the return work.

  In particular, according to the eighth to eleventh inventions, since the sheath-and-tube joint is integrally formed of metal by casting or welding, screwing operation at the site of constructing the transmission-type dam is not necessary, and further transmission-type Construction work of the dam can be done easily and in a short time. Further, according to the eighth to eleventh inventions, when the sheathed pipe joint is integrally formed by welding, welding in a factory or the like is necessary, but since the sheathed pipe joint is smaller than a huge circular steel pipe, It is possible to rotate the sheath joint according to the progress, and mechanical welding and welding only downward can be performed, and the welding cost can be suppressed.

  In particular, according to the tenth invention, the length of the sheath joint can be shortened as compared with the case of joining at different heights, and the number of required sheath joints can be reduced. For this reason, according to the tenth invention, it is possible to reduce the manufacturing cost of the sheath joint and the manufacturing cost of the transmission type dam.

  In particular, according to the eleventh invention, since the post-attachment flange is attached to the circular steel pipe to which the sheath pipe joint is fitted, the positioning flange can be attached later according to the progress of the joint operation of the circular steel pipe Therefore, construction work of the transmission type dam can be performed easily and in a short time.

It is a perspective view which shows the permeation | transmission type dam according to the embodiment of the present invention. It is a perspective view showing the steel slit dam concerning a 1st embodiment of the present invention. It is a perspective view which shows only the circular steel pipe of the steel slit dam same as the above. It is a side view of the steel slit dam of FIG. It is a partially expanded perspective view which mainly sees through partially the circular steel pipe of the steel slit dam of FIG. 2, and mainly shows the sheath pipe joint which concerns on 1st Embodiment. It is a perspective view which shows the 1st cylindrical member of the steel slit dam of FIG. It is a perspective view which shows the 2nd cylindrical member of the steel slit dam of FIG. It is a perspective view which shows the 3rd cylindrical member of the steel slit dam of FIG. It is a perspective view which shows the 4th cylindrical member of the steel slit dam of FIG. It is a perspective view which shows the steel slit dam which concerns on 2nd Embodiment of this invention. It is a side view showing a steel slit dam same as the above. It is a perspective view which shows the sheath pipe joint which concerns on 2nd Embodiment used for the steel slit dam same as the above. It is the perspective view which looked at the same sheath joint as the above. It is a perspective view which shows the steel slit dam which concerns on 3rd Embodiment of this invention. It is a side view showing a steel slit dam same as the above. It is a perspective view which shows the sheath pipe joint which concerns on 2nd Embodiment used for the steel slit dam same as the above. It is the perspective view which looked at the same sheath joint as the above. It is a perspective view shown by the case where it is used when positioning the post-fitting flange which concerns on embodiment of this invention same as the above.

  Hereinafter, the joint structure of the circular steel pipe for transmission type dams according to the embodiment of the present invention will be described in detail with reference to the drawings.

[Transmit Type Dam]
First, a transmission-type dam according to an embodiment of the present invention will be briefly described using a transmission-type sabo dam as an example with reference to FIG. As shown in FIG. 1, the transmission-type dam 1 includes two dams 2 for blocking debris flow, driftwood, etc., a water-passing part 3 provided between the two dams 2, and the water-passing part 3. It is comprised from the below-mentioned steel slit dam etc. which were installed in. The transmission type dam 1 is installed in a mountain stream or the like to prevent disasters due to debris flow or driftwood, and has a function of blocking debris flow such as driftwood or debris, and always flowing flowing water or sediment downstream. The illustrated mode illustrates the case where three steel slit dams D1 according to the first embodiment of the present invention are juxtaposed.

  The levee 2 is a concrete structure generally having a vertical cross section made of concrete and having a trapezoidal shape (bank shape). Of course, the bank body 2 may be a bank body filled with soil and the like solidified with soil cement between steel panels and precast concrete panels. In short, the levee 2 may be made of any material as long as it has a weight enough to block debris flow, driftwood, etc. and can withstand wind and rain as a levee.

  The water passage portion 3 is provided as a portion for flowing flowing water, soil and the like downstream, and a steel slit dam D1 is provided to block debris such as driftwood and debris. In addition, X has shown the upstream direction of the flow of a mountain stream, Y has shown the downstream direction (following the same).

[Steel Slit Dam According to First Embodiment]
Next, the steel slit dam D1 which concerns on 1st Embodiment of this invention is demonstrated using FIGS. 2-9. As shown in FIG. 2, the steel slit dam D1 according to the first embodiment includes two types of steel pipe assembly D10 in which circular steel pipes are combined and two types of steel pipe assemblies D10 provided at intersections of circular steel pipes in the steel pipe assembly D10. It is comprised from sheath joint S1, S2, etc.

(Circular steel pipe, steel pipe assembly)
The steel pipe assembly D10, as shown in FIG. 3, is a column D11 made of a circular steel pipe erected in a direction along the flow of the mountain stream, that is, along the XY direction, and these pillars D11, D11. A pair of left and right horizontal members D12 and D13 consisting of a circular steel pipe having the same diameter as the column D11 bridged horizontally along the mountain stream (XY direction) in upper and lower two stages between them, and a mountain stream orthogonal to these horizontal members D12 and D13 The pair of left and right connecting members D14, D15, etc., consisting of a circular steel pipe that is horizontally extended in two stages up and down between the columns D11 and D11 along the width direction of the pair, is combined symmetrically (Figure See also 4).

  Then, as shown in FIG. 2 and FIG. 4, the sheath pipe joints S1 and S2 are disposed at the intersections of the plurality of circular steel pipes, and the circular shape of the above-described steel pipe assembly D10 is set by these sheath pipe joints S1 and S2. It covers the steel pipe. Thus, by fitting the sheath joint S1, S2 to the outside of the circular steel pipe at the intersection of the circular steel pipes, the circular steel pipes of the steel pipe assembly D10 are joined together, and the steel pipe assembly D10 is assembled. .

  As shown in FIG. 3, a positioning flange F1 for hooking the sheath joint S1 at a predetermined position (height) is formed in the upper and lower two stages on the support D11. For this reason, there is no possibility that the sheath joint S1 and the sheath joint S2 installed thereon fall off, or the joining positions and heights of the horizontal members D12 and D13 and the joining members D14 and D15 are mistaken at the installation site. .

(Seal fitting)
As shown in FIG. 2 and FIG. 4, since the support D11 is erected along the mountain stream (XY direction), the tube axis of the horizontal members D12 and D13 crosses the tube axis of the support D11 In the portion where the tube axes of the circular steel pipes intersect with each other such that the upper corner is acute and the lower corner is obtuse, the sheathed tube joint S2 serving as the inclined joint is disposed at this intersection. .

  Further, as shown in FIG. 2, since the columns D11 are not provided to be inclined along the width direction (horizontal direction perpendicular to the X and Y directions) of the mountain stream, the tube axes of the connecting members D14 and D15; The tube axes of the circular steel pipes intersect at right angles with each other at the intersection of the column D11 with the tube axis, and at this intersection, a sheath joint S1 to be a right angle joint is disposed.

  In addition, as shown in FIG. 2 etc., the portion where horizontal members D12 and D13 and pillar D11 intersect intersect at the same angle in the upper and lower two steps, and the portion where joining members D14 and D15 and pillar D11 intersect, The upper and lower two stages are orthogonal to each other, and since the columns D11, the horizontal members D12 and D13, and the connecting members D14 and D15 are all made of circular steel pipe having the same diameter, both of the sheath tube joints S1 and S2 are upper and lower two steps Joints of the same shape are used.

  The sheath joint S1 is composed of one first cylindrical member E1 covering the straight portion of the column D11 and two second cylindrical members E2 covering the upper and lower right portions, and these cylindrical members E1 and E2 are By screwing and fixing with a bolt etc., it becomes one right angle joint (refer to FIG. 5, FIG. 2).

  The sheath joint S2 is configured of one first cylindrical member E1 covering the straight portion of the support D11, a third cylindrical member E3 covering the lower obtuse angle portion, and a fourth cylindrical member E4 covering the upper acute angle portion These cylindrical members E1, E3 and E4 are screwed and fixed with bolts or the like to form one inclined joint (see FIGS. 5 and 2).

(Cylindrical member)
As shown in FIG. 6, the first cylindrical member E1 has a semi-cylindrical cylindrical main body E10 in which a circular steel pipe having an inner diameter substantially the same as the outer diameter of the support D11 is longitudinally divided along the pipe axis. It is comprised from a pair of flange E11 etc. which were formed in the edge which followed the pipe-axis direction of the cylindrical main body E10.

  In the flange E11, four screw holes E11a for screwing are formed at intervals in the length direction (direction along the pipe axis), and around the outside of the screw holes E11a, From the outer surface of the flange E11 is formed a counterbored portion E11b that accommodates a screw head, a nut and the like. For this reason, a big head, a driftwood, etc. collide with a screw head (bolt head) or a nut, and a screw head, a nut, etc. are cut and fly off, joining of cylindrical members is released, and the joined part of steel pipe assembly D10 collapses. Can be prevented.

  The second cylindrical member E2 is provided with a cylindrical main body having a shape in which a semi-cylindrical member obtained by dividing a circular steel pipe having an inner diameter substantially the same as the outer diameter of the column D11 longitudinally along the pipe axis is orthogonal The part that covers the cylindrical main body E20, and the part that covers the joint material D14 or the joint material D15 is a cylindrical main body E21.

  Further, a pair of L-shaped flanges E22 are formed at the edges of the cylindrical main body E20 and the cylindrical main body E21 along the tube axis direction. Similar to the flange E22 and the first cylindrical member E1, four screw holes E22a are bored, and a screw head, a nut and the like are accommodated from the outer surface of the flange E22 around the outside of the screw hole E22a. A counterbored portion E22b is formed.

  Then, in the cylindrical main body E21 covering the joining material D14 or the joining material D15, an external force such as impact load, water pressure, earth pressure (deposit pressure) transmitted from the joining material D14 or the joining material D15 is transmitted to the support D11. A semicircular stress transfer plate E23 is formed as a stress transfer mechanism of The stress transfer plate E23 is a plate material whose surface is perpendicular to the tube axis direction of the cylindrical main body E21 so as to abut on the end face of the connecting member D14 or the connecting end of the connecting member D15. Integrated by welding.

  The third cylindrical member E3 has a cylindrical main body having a shape in which a semi-cylindrical member obtained by dividing a circular steel pipe having an inner diameter substantially the same as the outer diameter of the support D11 longitudinally along the pipe axis intersects at an obtuse angle The part covering the columns D11 is a cylindrical main body E30, and the part covering the horizontal members D12 or D13 is a cylindrical main body E31.

  Further, a pair of flanges E32 bent at an obtuse angle in a V shape is formed at the edges along the tube axis direction of each of the cylindrical main body E30 and the cylindrical main body E31. Similar to the second cylindrical member E2 described above, the flange E32 is provided with four screw holes E32a, and around the outside of the screw hole E32a, a screw head, a nut, etc. from the outer surface of the flange E32 A recessed counterbore E32b is formed to accommodate the

  Then, in the cylindrical main body E31 covering the horizontal member D12 or the horizontal member D13, an external force such as impact load, water pressure, earth pressure (sediary pressure) transmitted from the horizontal member D12 or the horizontal member D13 is transmitted to the support D11. A semicircular stress transfer plate E33 is formed as a stress transfer mechanism of The stress transfer plate E33 is a plate material whose surface is perpendicular to the tube axis direction of the cylindrical main body E31 so as to abut on the end face of the horizontal member D12 or the pipe end face of the horizontal member D13. Integrated by welding.

  Similarly to the third cylindrical member E3, in the fourth cylindrical member E4, a semi-cylindrical member obtained by dividing a circular steel pipe having an inner diameter substantially the same as the outer diameter of the column D11 longitudinally along the pipe axis at an acute angle A portion having a cross-shaped cylindrical body, the portion covering the support D11 is a cylindrical body E40, and the portion covering the horizontal member D12 or the horizontal member D13 is a cylindrical body E41.

  Further, a pair of flanges E42 bent at an acute angle in a V-shape are formed at edges along the tube axis direction of each of the cylindrical main body E40 and the cylindrical main body E41. Similar to the flange E42 and the third cylindrical member E3 described above, four screw holes E42a are bored, and a screw head, a nut, etc. are provided from the outer surface of the flange E42 around the outside of the screw hole E42a. A recessed counterbore E42b is formed to accommodate the same.

  Then, in the cylindrical main body E41 covering the horizontal member D12 or the horizontal member D13, external forces such as impact load, water pressure, earth pressure (sedimentation pressure) transmitted from the horizontal member D12 or the horizontal member D13 are transmitted to the support D11. A semicircular stress transfer plate E43 is formed as a stress transfer mechanism of The stress transfer plate E43 is a plate member whose surface is perpendicular to the tube axis direction of the cylindrical main body E41 so as to abut on the end surface of the horizontal member D12 or the pipe end surface of the horizontal member D13. Integrated by welding.

(Operation effect of the steel slit dam according to the first embodiment)
According to the steel slit dam D1 according to the first embodiment in which the steel pipe assembly D10 is joined using the sheathed pipe joint S1 and the sheathed pipe joint S2 described above, the column D11 which is a huge circular steel pipe and the horizontal member D12 , D13 and joints D14 and D15 do not need to be welded directly, and it is easy to manufacture in advance in a factory etc., and the manufacturing cost of the steel slit dam can be reduced.

  Further, according to the steel slit dam D1, the connection work at the site where the steel slit dam D1 is installed rotates the screw etc. to assemble the sheath pipe joints S1 and S2, and the horizontal members D12 and D13 and the joints are connected thereto. Since only the materials D14 and D15 are fitted, the installation operation can be completed in a very short time. For this reason, the installation cost of steel slit dam D1 and transmission type dam 1 can further be reduced.

  And, in the steel slit dam D1, since the sheath pipe joints S1 and S2 are freely assembled and disassembled, unlike the steel slit dams D2 and D3 according to the second and third embodiments described later, As in the prior art, it becomes possible to install the other round steel pipe after installing the pillar D11 first and casting the root wound concrete. Therefore, the degree of freedom of the construction procedure is high, and the working time can be shortened.

  Furthermore, according to the steel slit dam D1 provided with the sheath joint S1 and the sheath joint S2, only the welding of the semi-cylindrical members smaller than the column D11 and the like is sufficient, so the three-dimensional cutting length is While being short, it is easy to rotate the base material in accordance with the progress of welding of the members to be welded. Therefore, welding work in a factory or the like in advance is easy, mechanical welding or the like becomes possible, and the manufacturing cost of the steel slit dam D1 can be reduced.

  In addition, since the countersunk parts E11b, E22b, E32b, and E42b for accommodating screw heads or nuts are formed in the joint between the cylindrical members in the sheath joint S1 and the sheath joint S2, the screw head is formed. It is possible to prevent the joint portion of the steel pipe assembly D <b> 10 from collapsing due to the collision of a big head or a driftwood with a nut and a screw head and a nut flying.

  Furthermore, according to the steel slit dam D1, the symmetrical construction is made to join the circular steel pipes to the same angle as much as possible, and a part of the parts constituting the sheath joint S1 and the sheath joint S2 is made common Since only four types of cylindrical members can be used, it is possible to reduce the number of press molds and the number of production lines, and to enjoy the merits of scale.

  The sheath fittings S1 and S2 of the steel slit dam D1 are made of rolled steel for general structure, but other steels may be used, and if predetermined design strength is obtained, casting, for example, molten metal is molded It is also possible to make it into a die-cast made by press-molding it. By casting, complicated three-dimensional curve cutting and welding can be eliminated, and further labor saving and cost reduction can be achieved.

  Also, although the stress transfer plates E23, E33, and E43 provided vertically to the tube axis have been illustrated as the stress transfer mechanism, a plate-shaped object that is provided vertically to the tube axis is described as the stress transfer mechanism. The shape is not limited to the above, and other shapes may be used such as slopes and slopes, curved surfaces and curved surfaces, curved surfaces and flats, etc. that are in contact with the end of the circular steel pipe with metal touch. In short, the stress transfer mechanism may be any mechanism capable of transferring stress such as axial force, bending stress or shear force acting on the circular steel pipe.

[Steel Slit Dam According to Second Embodiment]
Next, a steel slit dam D2 according to a second embodiment of the present invention will be described with reference to FIGS. The steel slit dam D2 according to the second embodiment, as shown in FIGS. 10 and 11, is provided at the intersection of a steel pipe assembly D20 in which circular steel pipes are combined and the circular steel pipe of the steel pipe assembly D20. It is comprised from 2 types of sheath-tube couplings S3, S4.

(Circular steel pipe, steel pipe assembly)
The steel pipe assembly D20 is, as shown in FIGS. 10 and 11, a column D21 made of a circular steel pipe erected inclining along the X and Y directions, and two vertical streams between the columns D21 and D21. A pair of left and right horizontal members D22 and D23 consisting of a circular steel pipe having the same diameter as the pillar D21 bridged horizontally along the XY direction), and a pillar D21 along the width direction of the mountain stream orthogonal to the horizontal members D22 and D23. , D21 and so on, which are combined in a symmetrical manner from the pair of left and right connecting members D24, D25, etc., which are formed of circular steel pipes that are horizontally extended in two stages vertically.

  The difference between the steel pipe assembly D20 and the steel pipe assembly D10 described above is that the joining position (height) of the joining members D24 and D25 is the same height as the horizontal members D22 and D23. . For this reason, the configuration of the steel slit dam D2 is simplified and the design and the like are facilitated.

  And as shown to FIG. 10, FIG. 11, sheathed pipe joints S3 and S4 are arrange | positioned at the intersection part of these some circular steel pipes, The circular shape of the steel pipe assembly D20 of the above-mentioned by these sheathed pipe joints S3 and S4. It covers the steel pipe. Thus, by fitting the sheath joint S3, S4 to the outside of the circular steel pipe at the intersection of the circular steel pipes, the circular steel pipes of the steel pipe assembly D20 are joined, and the steel pipe assembly D20 is assembled. .

  In addition, unlike the above-mentioned post D11, the sheath pipe joints S3 and S4 are provided at predetermined positions in the post D21 in order to fit and slide the sheath joints S3 and S4 from the upper end of the post D21. The positioning flange for hooking to (height) is not formed. Instead, as shown in FIGS. 10 and 11, a retrofit flange F2 attachable to the column D21 is attached by turning and tightening a screw (see FIG. 18). Therefore, the steel pipe assembly D20 can be easily assembled in a short time.

(Seal fitting)
As shown in FIG. 10, sheath joints S3 and S4 are for joining both the horizontal member D22 or the horizontal member D23 and the joining member D24 or the joining member D25 to the support D21, and the sheath tube The joint S3 and the sheath joint S4 have symmetrical symmetry, and have almost the same shape. Therefore, only the sheath joint S3 will be described, and the description of the sheath joint S4 will be omitted.

  As shown in FIG. 12 and FIG. 13, the sheath joint S3 is a joint main body S30 to be fitted to the column D21, a joint material joint portion S31 for joining the joint material D24 or the joint material D25, and the horizontal material D22 or horizontal The joint main body S30, the joint material joint S31, and the horizontal material joint S32 are formed of a horizontal material joint S32 or the like for joining the material D23, and for the general structure having an inner diameter substantially the same as the outer diameter of the support D21. It is welded and formed integrally from a circular steel pipe.

  The impact load, water pressure, earth pressure (sediary pressure), etc. transmitted from the joining member D24 or the joining member D25, or the horizontal member D22 or the horizontal member D23, to the joint member joint portion S31 and the horizontal member joint portion S32, respectively Circular stress transmission plates S31a and S32a are welded and attached as a stress transmission mechanism for transmitting the external force of the above to the column D21. The stress transfer plates S31a and S32a are in the tube axial direction of the joint portion S31 or the horizontal joint portion S32 so as to be in contact with the joint surface of the joint member D24, the joint member D25, the horizontal side member D22 or the horizontal end face of the horizontal member D23. It is a plate material which makes a plane perpendicular to the plate surface.

  Of course, as described above, the stress transfer mechanism is not limited to a plate-like object vertically installed with respect to the pipe axis, and slopes and slopes, curved surfaces and curved surfaces, curved pipe and flat, etc. It does not matter even if it is another shape which abuts. In short, the stress transfer mechanism may be any mechanism capable of transferring stress such as axial force, bending stress or shear force acting on the circular steel pipe.

(Operation and effect of the steel slit dam according to the second embodiment)
According to the steel slit dam D2 according to the second embodiment in which the steel pipe assembly D20 is joined using the sheath joint S3 and the sheath joint S4 described above, the cylindrical members are smaller than the columns D21 and the like. Since only welding is required, the length for three-dimensional cutting can be short, and the base material can be easily rotated according to the progress of welding of the members to be welded. Therefore, welding work in a factory or the like in advance is easy, mechanical welding or the like becomes possible, and the manufacturing cost of the steel slit dam D2 can be reduced. In other words, it is not necessary to directly weld the joints between the massive circular steel pipe column D21 and the horizontal members D22 and D23 and the connecting members D24 and D25, which makes it easy to manufacture in advance in a factory etc. Production cost can be reduced.

  Further, according to the steel slit dam D2, the connection work at the site where the steel slit dam D2 is to be installed, fitting two sheath pipe joints S3 and two sheath pipe joints S4 into two columns on two columns D21. A horizontal member D22 and a horizontal member D23 are inserted between the sheath joint S3 and the sheath joint S4, and two sets of steel pipe assemblies are assembled, lifted using a lifting machine or the like, and connected to these. The steel slit dam D2 can be easily assembled without screwing operation only by inserting the materials D24 and D25 and moving horizontally. Therefore, compared with the steel slit dam D1, the installation work can be completed in a short time, which is extremely simple. Therefore, the installation cost of the steel slit dam D2 and the transmission type dam 1 can be further reduced.

  Furthermore, according to the steel slit dam D2, since it can be configured with only two types of sheath pipe joints, it is possible to reduce the number of press molds and reduce the production line, and also enjoy scale merit. .

  Moreover, the steel slit dam D2 has the required number of sheath pipe joints reduced compared to the above-mentioned steel slit dam D1, and the length of the sheath pipe joint is smaller than the steel slit dam D3 described later. It can be short. For this reason, the manufacturing cost of a sheath joint and the manufacturing cost of a steel slit dam and a transmission type dam can be reduced.

  In addition, in the case of the steel slit dam D2, since the mounting positions of the sheath pipe joint S3 and the sheath pipe joint S4 are positioned by the retrofit flange F2, the process of joining the steel pipe assembly D20 which is a circular steel pipe of the steel slit dam D2 proceeds. Then, the post attachment flange F2 can be attached later to position the sheath joint S3 and the like. For this reason, construction work of the transmission type dam can be performed easily and in a short time.

  In addition, although sheath pipe joints S3 and S4 of steel slit dam D2 consist of a circular steel pipe for general structure, other steel materials and steel pipes may be used, and as in the case of sheath pipe joints S1 and S2 described above, predetermined design strength If it is obtained, it is also possible to use a cast, for example, a die cast made by pouring molten metal in a mold and press-molding. By casting, complicated three-dimensional curve cutting and welding can be eliminated, and further labor saving and cost reduction can be achieved.

[Steel Slit Dam According to Third Embodiment]
Next, a steel slit dam D3 according to a third embodiment of the present invention will be described using FIGS. 14 to 18. The steel slit dam D3 according to the third embodiment, as shown in FIGS. 14 and 15, is provided at the intersection of a steel pipe assembly D30 in which circular steel pipes are combined and the circular steel pipe of the steel pipe assembly D30. It is comprised from two types of sheath joint S5, S6 etc.

(Circular steel pipe, steel pipe assembly)
As shown in FIGS. 14 and 15, the steel pipe assembly D30 is a column D31 made of a circular steel pipe erected along the X and Y directions, and two vertical streams between the columns D31 and D31. A pair of left and right horizontal members D32 and D33 made of circular steel pipe having the same diameter as the pillar D31 horizontally extended along the XY direction), and a pillar D31 along the width direction of the mountain stream orthogonal to the horizontal members D32 and D33. , D31 and so on, and so on from the pair of left and right connecting members D34, D35, etc., which are circular steel pipes that are horizontally extended in two stages vertically.

  The difference between the steel pipe assembly D30 and the steel pipe assemblies D10 and D20 described above is that the joining position (height) of the joining members D24 and D25 is higher than the horizontal members D22 and D23. It is.

  Then, as shown in FIG. 14 and FIG. 15, the sheath pipe joints S5 and S6 are disposed at the intersections of the plurality of circular steel pipes, and the circular shape of the above-described steel pipe assembly D30 is obtained by these sheath pipe joints S5 and S6. It covers the steel pipe. Thus, by fitting the sheathed tube joints S5 and S6 to the outside of the circular steel pipe at the intersection of the circular steel pipes, the circular steel pipes of the steel pipe assembly D30 are joined, and the steel pipe assembly D30 is assembled. .

  Further, even with the steel slit dam D3, as shown in FIG. 14, FIG. 15, and FIG. 18, similarly to the steel slit dam D2, the retrofit flange F2 attachable to the column D31 is attached by turning and tightening a screw. There is. Therefore, the steel pipe assembly D30 can be easily assembled in a short time. It should be noted that when the assembly work of the steel pipe assembly D30 is finished, the distance between the columns D31 increases as it goes downward, so there is no risk of the sheath joint S5, S6 shifting downward, and the retrofit flange F2 is removed. It is also possible.

(Seal fitting)
The sheath joints S5 and S6, as shown in FIG. 14, are members for joining both the horizontal member D32 or the horizontal member D33 and the joining member D34 or the joining member D35 to the support D31, and the sheath tube The joint S <b> 5 and the sheath joint S <b> 6 have symmetrical symmetry and have almost the same shape. Therefore, only the sheath joint S5 will be described, and the description of the sheath joint S6 will be omitted.

  The sheath joint S5 is, as shown in FIGS. 16 and 17, a joint main body S50 fitted to the column D31, a horizontal member joint S51 for connecting the horizontal member D32 or the horizontal member D33, and a joint member D34 or joint A joint material joint S52 joining the material D35, and the like, and the joint main body S50, the horizontal joint S51, and the joint joint S52 generally have an inner diameter substantially the same as the outer diameter of the column D31. It is welded and integrally formed from a circular steel pipe for construction.

  The impact load, water pressure, earth pressure (sediary pressure), etc. transmitted from the horizontal member D32 or the horizontal member D33, or the link member D34 or the link member D35, to the horizontal member joint portion S51 and the joint member joint portion S52, respectively. Circular stress transmission plates S51a and S52a are welded and attached as a stress transmission mechanism for transmitting the external force of the above to the column D31. The stress transfer plates S51a and S52a are in the tube axial direction of the joint portion S52 or the horizontal joint portion S51 so as to abut on the end face of the horizontal end face of the horizontal end D32, horizontal end D33, joint end D34, or D35. It is a plate material which makes a plane perpendicular to the plate surface.

  Of course, as described above, the stress transfer mechanism is not limited to a plate-like object vertically installed with respect to the pipe axis, and slopes and slopes, curved surfaces and curved surfaces, curved pipe and flat, etc. It does not matter even if it is another shape which abuts. In short, the stress transfer mechanism may be any mechanism capable of transferring stress such as axial force, bending stress or shear force acting on the circular steel pipe.

(Operation and effect of the steel slit dam according to the third embodiment)
According to the steel slit dam D3 according to the third embodiment in which the steel pipe assembly D30 is joined using the sheath joint S5 and the sheath joint S6 described above, the cylindrical members are smaller than the columns D31 and the like. Since only welding is required, the length for three-dimensional cutting can be short, and the base material can be easily rotated according to the progress of welding of the members to be welded. Therefore, welding work in a factory or the like in advance is easy, mechanical welding or the like becomes possible, and the manufacturing cost of the steel slit dam D3 can be reduced. In other words, there is no need to directly weld the joints between the massive circular steel pipe column D31 and the horizontal members D32 and D33 and the joints D34 and D35, which makes it easy to manufacture in advance in a factory etc. Production cost can be reduced.

  Further, according to the steel slit dam D3, the steel pipe assembly is assembled in the same manner as the steel slit dam D2, and only lifting and moving horizontally using a lifting machine or the like, without screwing work The steel slit dam D2 can be easily assembled. Therefore, compared with the steel slit dam D1, the installation work can be completed in a short time, which is extremely simple. Therefore, the installation cost of the steel slit dam D3 and the transmission type dam 1 can be further reduced.

  Furthermore, according to the steel slit dam D3, since it can be configured by only two types of sheath pipe joints, it is possible to reduce the number of press molds and reduce the production line, and also enjoy scale merit. .

  Further, in the case of the steel slit dam D3, since the mounting positions of the sheath pipe joint S5 and the sheath pipe joint S6 are positioned by the retrofit flange F2, the process of joining the steel pipe assembly D30 which is a circular steel pipe of the steel slit dam D3 Then, the post-mounting flange F2 can be attached later to position the sheath joint S5 or the like. For this reason, construction work of the transmission type dam can be performed easily and in a short time.

  The joint structure of the circular steel pipe for transmission type levee according to the embodiment of the present invention, the sheath pipe joint used for the joint structure, and the transmission type dam using the joint structure have been described in detail. Any of the illustrated embodiments is merely an embodiment embodied in practicing the present invention, and the technical scope of the present invention should not be interpreted in a limited manner by these.

1: Transmission type dam 2: Embankment 3: Water flow part D1, D2, D3: Steel slit dam D10, D20, D30: Steel pipe assembly (round steel pipe)
D11, D21, D31: Struts (round steel pipe)
D12, D13, D22, D23, D32, D33: Horizontal members (round steel pipe)
D14, D15, D24, D25, D34, D35: Connecting material (round steel pipe)
S1, S2, S3, S4, S5, S6: Sheath fitting E1: first cylindrical member E2: second cylindrical member E3: third cylindrical member E4: fourth cylindrical members E23, E33, E43: stress transmission plate (stress Transmission mechanism)
S31a, S32a, S51a, S52a: Stress transfer plate (stress transfer mechanism)
E11b, E22b, E32b, E42b: Counterparts

Claims (13)

A joint structure of circular steel pipes for transmission type levee, in which the circular steel pipes constituting the transmission type dam are crossed and joined,
A crossing portion of the plurality of circular steel pipes is externally fitted to a sheath pipe joint made of a plurality of pipes having a diameter that is externally fitted to the circular steel pipe, and the circular steel pipes are joined together.
The sheath joint includes a stress transfer mechanism which is fitted to one of the plurality of circular steel pipes intersecting at the intersection and transmits the stress to the other circular steel pipes intersecting with each other, and this stress transmission An external force such as an impact load acting on one of the circular steel pipes via a mechanism is movably joined to the other of the intersecting circular steel pipes ,
The joint structure of circular steel pipe for transmission type embankment characterized in that the stress transfer mechanism is integrated with the sheath pipe joint so as to abut on a pipe end surface of another intersecting circular steel pipe . The sheath joint is inserted so as to penetrate one of the plurality of circular steel pipes intersecting at the intersection, and is fitted to a portion excluding the pipe end of the circular steel pipe. The joint structure of the circular steel pipe for transmission type dams as described in 1. The circular steel pipe for transmission-type dams according to claim 1 or 2, wherein the stress transmission mechanism is a stress transmission plate formed of a plate material in contact with the end face of another intersecting circular steel pipe at the surface. Junction structure. The joint structure of circular steel pipe for transmission type embankment according to any one of claims 1 to 3, wherein the sheath joint comprises a plurality of cylindrical members that can be assembled or disassembled. The joint structure of circular steel pipe for transmission type embankment according to claim 4, wherein the cylindrical member is formed with a countersunk portion for accommodating a screw head or a nut in a screwing portion. The sheath joint is commonly used in both cases where the circular steel pipes are used at the intersection where the circular steel pipes intersect at right angles and where the circular steel pipes are used at the intersection where the acute and obtuse angles intersect. It has a cylindrical member of shape. The joining structure of the circular steel pipe for permeation | transmission type dams of Claim 4 or 5 characterized by these. The transmission according to any one of claims 4 to 6, wherein the circular steel pipe into which the sheath pipe joint is fitted is formed with a positioning flange which determines the position where the sheath pipe joint is fitted. Connection structure of circular steel pipe for type embankment. The joint structure of circular steel pipe for transmission type dams according to any one of claims 1 to 3, wherein the sheath-and-tube joint is integrally formed of metal by casting or welding. The sheathed pipe joint is a joint that joins a plurality of circular steel pipes so as to cross the fitted circular steel pipe, and the plurality of circular steel pipes intersecting the fitted circular steel pipe have different heights. The joint structure of circular steel pipe for transmission type dams according to claim 8, characterized in that they are jointed so as to cross each other. The sheath pipe joint is a joint for joining a plurality of circular steel pipes to intersect with the fitted circular steel pipe, and the plurality of circular steel pipes intersecting with the fitted circular steel pipe have the same height. The joint structure of circular steel pipe for transmission type dams according to claim 8, characterized in that they are jointed so as to cross each other. 11. A retrofitting flange for determining a position to which the sheath pipe joint is fitted is attached to the circular steel pipe in which the sheath pipe joint is fitted, according to any one of claims 8 to 10 The joint structure of the circular steel pipe for transmission type dams of statement. It is a sheath pipe joint used for the joint structure of the circular steel pipe for transmission type dams according to any one of claims 1 to 11, Comprising: The sheath pipe joint characterized by including the above-mentioned stress transfer mechanism. A transmission-type levee characterized by comprising the joint structure of the circular pipe for transmission-type levee according to any one of claims 1 to 11.

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