JP6308839B2 - The hinge structure of a beam - Google Patents

Description

  The present invention relates to a hinge structure of a cut beam, and more particularly to a structure provided at a connection portion with a side wall portion in a cut beam spanned between a pair of opposing side wall portions.

  For example, when there is a pair of opposing side wall portions such as a mountain retaining wall, it is common to support the side wall portions by spanning a beam between both side wall portions. There are various types of cut beams. For example, a technique for reducing the number of cut beams used (see Patent Document 1), a technique for suppressing deformation and displacement of the ground around the retaining wall (see Patent Document 2). ) Is disclosed.

  The technique described in Patent Document 1 is such that the erection material is supported by an erection support material configured to be slidable in the vertical direction along the sheet pile and can be positioned at a desired height. It is constructed along the longitudinal direction of the wall. The ends of the bellows adjacent to each other in the longitudinal direction are connected to a joint member having an opening that accommodates the ends, and a cut beam is provided between the joint members arranged opposite to each other in the groove width direction. It has an attached structure.

  The technique described in Patent Document 2 relates to a method for constructing a beam in a mountain retaining work. Then, a mountain retaining wall is constructed in the ground, and a cutting beam for supporting the mountain retaining wall is installed before rooting the inside of the mountain retaining wall. The beam is a beam main body provided with a jack that can be expanded and contracted in the axial direction, a support member provided at both ends thereof and extending in at least two orthogonal directions, and a universal member interposed between the beam main body and the support member. It has a structure with a joint.

  Moreover, the technique (refer patent document 3) which uses a universal joint for the connection part of a cut beam and an abdomen similarly to patent document 2 is disclosed. The technique described in Patent Document 3 is a technique for connecting a struck beam or a cut beam to a bulge. Then, the convex member of the universal joint having a semicircular head is attached to the tip of the fire beam or cutting beam, and the concave member of the semicircular universal joint that can be slid by fitting the convex member on the flank side It is structured to be attached to the abdomen via a fire receiving box.

JP 2007-120223 A JP 2003-193470 A JP-A-6-316930

  For example, when a structure is constructed using a steel pipe sheet pile, the soundness of the structure cannot be maintained unless the steel pipe sheet pile can be reliably supported by the cut beam. In this case, a reliable hinge structure, safety against the axial force acting on the beam can be secured, the beam will not fall out in the event of an earthquake, the structure will not collapse, and durability even in a salt damage environment It is required that it can be secured. Furthermore, after satisfying the above-mentioned required performance, construction is easy, and it is desired to shorten the construction period and reduce construction costs.

  In this respect, it cannot be said that the conventional techniques (Patent Documents 1 to 3) can satisfy all of the required performances described above. Moreover, in the technique (patent document 2 and patent document 3) using a universal joint for a connection part, there exists a danger that a cut beam will fall out especially at the time of an earthquake occurrence.

  The present invention has been proposed in view of the above-described circumstances, has a reliable hinge structure, can secure safety against the axial force acting on the cutting beam, and does not fall off the cutting beam when an earthquake occurs. An object of the present invention is to provide a hinge structure for a cut beam that can ensure durability even in an environment, is easy to construct, shortens the construction period, and reduces construction costs.

  In order to achieve the above-described object, the hinge structure of a beam according to the present invention has the following features. In other words, the hinge structure of a cut beam according to the present invention is a hinge structure of a cut beam that spans between a pair of opposing side wall portions, and a sheath tube that is attached to both ends of the cut beam, and a hinge portion that is inserted into the sheath tube It consists of.

  The sheath tube is provided on the cylindrical portion that is open on one side and closed on the other side and on the closed side of the tubular portion, and the tip of the hinge portion abuts to swing the hinge portion with respect to the sheath tube. A support portion that is movably supported, and a sheath tube that is discontinuously provided on the same circumference of the inner peripheral surface of the cylindrical portion and prevents the hinge portion from falling off in the vicinity of the cylindrical portion. And a side drop prevention portion.

  In addition, the hinge portions are provided at both ends of the cut beam, respectively, a substantially hemispherical contact member protruding toward the end portion of the sheath tube, and a discontinuous portion of the sheath tube side drop prevention portion from the discontinuous portion of the sheath tube. It can be inserted toward the closed side, and by rotating it relative to the sheath tube with the long axis of the cut beam as the rotation axis, the hinge portion falls off against the sheath tube side drop prevention portion. The hinge part side drop prevention part to prevent is provided, It is characterized by the above-mentioned.

  In addition to the above-described configuration, the hinge structure of the beam according to the present invention preferably includes a buffer member for buffering the contact between the inner peripheral surface of the sheath tube and the outer peripheral surface of the hinge portion. .

  In addition to the above-described configuration, in the hinge structure for a beam according to the present invention, the sheath tube preferably includes a plurality of deviation preventing protrusions protruding from the outer peripheral surface.

  According to the hinge structure of a cut beam of the present invention, it comprises a sheath tube attached to both ends of the beam and a hinge portion inserted into the sheath tube, and the sheath tube supports the hinge portion so as to be swingable with respect to the sheath tube. The hinge part is provided with the substantially hemispherical contact member which protruded toward the edge part of a sheath pipe. Further, the sheath tube and the hinge portion are respectively provided with a sheath tube side drop prevention portion and a hinge portion side drop prevention portion for preventing the hinge portion from falling off.

  Therefore, a reliable hinge structure can be obtained, safety can be ensured against the axial force acting on the beam, and the structure can be prevented from collapsing because there is no possibility that the beam will fall off when an earthquake occurs. In addition, it is possible to ensure durability even in a salt damage environment. In addition, the construction can be easily performed after satisfying the above-described required performance, and the construction period can be shortened and the construction cost can be reduced.

The longitudinal cross-sectional view of the sheath pipe and hinge part which concerns on embodiment of this invention. The cross-sectional view of the sheath tube and hinge part which concerns on embodiment of this invention. The longitudinal cross-sectional view (1) which shows the installation procedure of the hinge structure of a cut beam which concerns on embodiment of this invention. The longitudinal cross-sectional view (2) which shows the installation procedure of the hinge structure of a beam according to the embodiment of the present invention. The longitudinal cross-sectional view which shows the installation state of the hinge structure of the cut beam which concerns on embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a hinge structure for a beam according to the present invention will be described with reference to the drawings. 1 to 5 illustrate a hinge structure of a beam according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a sheath tube and a hinge portion, and FIG. 2 is a transverse sectional view of the sheath tube and the hinge portion. 3 and 4 are longitudinal sectional views showing the installation procedure of the hinge structure, and FIG. 5 is a longitudinal sectional view showing the installation state of the hinge structure.

<Outline of hinge structure of beam>
As shown in FIGS. 3 to 5, the hinge structure of a cut beam according to the embodiment of the present invention is a cut beam (for example, a steel pipe cut beam 100) that spans between a pair of opposing side wall portions (for example, a steel pipe sheet pile 400). The hinge structure 10) is a main component of a sheath tube 200 attached to both ends of the beam and a hinge portion 300 inserted into the sheath tube 200. As shown in FIG. 5, the hinge structure 10 of the steel pipe cutting beam 100 according to the present embodiment is a structure applied to a grooved structure (for example, a water channel) formed by steel pipe sheet piles 400 provided to face each other. A bottom concrete 500 is provided on the bottom surface of the groove-like structure. In the present invention, the side wall portion is not limited to the steel pipe sheet pile 400, and the cut beam is not limited to the steel pipe sheet beam 100.

<Sheath tube>
As shown in FIG. 1 and FIG. 2, the sheath tube 200 includes a cylindrical portion 210 that is open on one side and closed on the other side. A steel pipe is provided from the open side of the cylindrical portion 210 to the inside of the cylindrical portion 210. One end part (hinge part 300) of the cutting beam 100 is inserted. That is, the sheath tube 200 is a member that is attached to each end portion of the steel tube cutting beam 100.

  The distal end (abutting member 310) of the hinge part 300 abuts on the closed side of the tubular part 210 of the sheath pipe 200, and the support part 211 that supports the hinge part 300 so as to be swingable with respect to the sheath pipe 200. Is provided. As will be described in detail later, a substantially hemispherical contact member 310 protruding toward the end portion of the sheath tube 200 is provided at the tip of the hinge portion 300. Therefore, the support portion 211 is a substantially hemispherical recess for receiving the contact member 310.

  Further, in the vicinity of the open side of the tubular portion 210 of the sheath tube 200, a sheath tube side drop prevention portion 220 that is a member protruding from the inner surface of the tubular portion 210 and prevents the hinge portion 300 from falling off is provided. is there. The sheath tube side drop prevention part 220 is discontinuously provided on the same circumference of the inner peripheral surface of the cylindrical part 210 and is opposed to the hinge part side drop prevention part 320 provided in the hinge part 300. This prevents the hinge part 300 from falling off the sheath tube 200.

  That is, the sheath tube side drop prevention part 220 is a member having a substantially arcuate cross section provided so as to protrude from the inner surface of the tubular part 210 toward the inside of the tubular part 210. In the present embodiment, the tubular part 210 is provided. There are two places inside the. And a discontinuous part is provided between the two sheath tube side drop prevention parts 220, and the two hinge part side drop prevention parts 320 can pass through the interval.

  In addition, a plurality of deviation preventing projections 230 projecting outward are provided on the outer peripheral surface of the sheath tube 200. The sheath tube 200 is used by being embedded in the upper portion of the side wall (for example, the steel pipe sheet pile 400), but the sheath tube 200 can be firmly fixed to the side wall by the misalignment prevention protrusion 230.

<Hinge part>
As shown in FIGS. 1 and 2, the hinge portion is a member provided at each end of the steel pipe cutting beam 100. The hinge portion 300 includes a substantially hemispherical contact member 310 protruding toward the end of the sheath tube 200. As described above, when the contact member 310 contacts the support portion 211, the hinge portion 300 can be swingably supported with respect to the sheath tube 200.

  Further, the hinge portion 300 can be inserted from the discontinuous portion of the sheath tube side drop prevention portion 220 toward the closed side of the sheath tube 200, and the sheath tube 200 is configured with the long axis of the steel tube cut beam 100 as the rotation axis. The hinge part side drop prevention part 320 which prevents the fall off of the hinge part 300 is provided so as to face the sheath pipe side drop prevention part 220 by being rotated relatively with respect to.

  That is, the hinge part side drop prevention part 320 protrudes from the outer peripheral surface of the hinge part 300 so that it can be inserted from the discontinuous part of the sheath pipe side drop prevention part 220 toward the closing side of the sheath pipe 200. It is the provided bowl-shaped member. In this embodiment, two base portions of the hinge part 300 are expanded in a bowl shape toward the outside, and the two hinge part side drop prevention parts 320 have two sheath pipe side drop prevention parts 220. It is possible to pass through the discontinuous part.

  Then, after inserting the hinge part 300 into the sheath pipe 200, the sheath pipe 200 and the hinge part 300 are rotated relative to each other with the long axis of the steel pipe cut beam 100 as the rotation axis, thereby preventing the sheath pipe side from falling off. The portion 220 and the hinge portion side drop prevention portion 320 face each other, and the hinge portion 300 is prevented from falling off the sheath tube 200. Here, relative rotation of the sheath tube 200 and the hinge portion 300 may mean that the sheath tube 200 may be rotated with the steel tube beam 100 to which the hinge portion 300 is attached fixed, or the sheath tube 200 may be rotated. As a fixed state, it means that the steel pipe beam 100 provided with the hinge part 300 may be rotated, or the steel pipe beam 100 provided with the hinge part 300 and the sheath pipe may be rotated in opposite directions. .

  The casing tube side drop prevention part 220 and the hinge part side drop prevention part 320 are overlapped in the facing state, and thereby the hinge part side drop prevention part 320 is added to the sheath tube side drop prevention part 320. Prevents the hinge part 300 from falling out of the sheath tube 200.

  In addition, a buffer member is provided between the inner peripheral surface of the sheath tube 200 and the outer peripheral surface of the hinge part 300 to buffer the contact between the two. The buffer member includes a buffer member 331 attached to the sheath tube 200 and a buffer member 332 attached to the hinge part 300. The buffer member 331 and the buffer member 332 are made of a member having flexibility and elasticity such as rubber and synthetic resin, for example, and when the hinge part 300 swings with respect to the sheath tube 200, an impact between the two is given. Can be softened.

<Installation of hinge structure>
In order to install the hinge structure of the cut beam according to the present embodiment, as shown in FIGS. 3 and 4, the gap of the hinge part 300 is filled with a filling grout 240 (for example, non-shrink mortar) to cut the steel pipe. The sheath tube 200 is attached to the hinge portions 300 provided at both ends of the beam 100. In order to attach the sheath tube 200 to the hinge portion 300, the distance (discontinuous portion) between the pair of sheath tube side drop prevention portions 220 provided in the tubular portion 210 of the sheath tube 200 is set to a pair of hinge portions 300. The hinge part side drop prevention part 320 is allowed to pass, and the hinge part side drop prevention part 320 is positioned on the front side of the buffer member 331 installed in the sheath tube 200.

  Then, after the sheath tube 200 and the hinge portion 300 are relatively rotated so that the sheath tube side drop prevention portion 220 and the hinge portion side drop prevention portion 320 face each other, the contact member 310 of the hinge portion 300 is contacted. Until the abutment comes into contact with the support portion 211 of the sheath tube 200, the hinge portion 300 is inserted into the sheath tube 200.

  Moreover, in the side wall part which consists of a pair of steel pipe sheet piles 400, while cut | disconnecting the upper part of each steel pipe sheet pile 400, and providing the notch part 410, concrete is made into the side (opposite to a natural mountain) which both steel pipe sheet piles 400 oppose. A support frame 510 is provided by placing the support frame. A suspended form (not shown) is installed inside the steel pipe sheet pile 400, and the intermediate concrete 520 is placed so as to be approximately the same height as the support frame 510.

  And on the upper surface of the support frame 510, the steel pipe cutting beam 100 with the sheath pipe 200 attached is placed, and concrete is cast so as to cover the upper part of the sheath pipe 200 and the steel pipe sheet pile 400 to form the cap portion 530, The steel pipe cutting beam 100 is fixed to the upper part of the steel pipe sheet pile 400. After that, although not shown in detail, the backup member 340 is attached to the sheath tube side drop prevention portion 220 and the sealing material is filled to seal the mouth of the sheath tube 200.

DESCRIPTION OF SYMBOLS 10 Hinge structure 100 Steel pipe cutting beam 200 Sheath pipe 210 Cylindrical part 211 Support part 220 Sheath pipe side fall prevention part 230 Misalignment prevention protrusion 240 Filling grout 300 Hinge part 310 Contact member 320 Hinge part side fall prevention part 331, 332 Buffer member 340 Backup member 400 Steel pipe sheet pile 410 Notch portion 500 Bottom base concrete 510 Support base 520 Filled concrete 530 Cap portion

Claims (3)

It is a hinge structure of a cut beam that spans between a pair of opposing side wall portions,
A sheath pipe attached to both ends of the beam, and a hinge part inserted into the sheath pipe,
The sheath tube is provided on the closed side of the cylindrical portion that is open on one side and closed on the other side, and the distal end of the hinge portion is in contact with the hinge portion with respect to the sheath tube. A support portion that is swingably supported, and is provided in the vicinity of the open side of the cylindrical portion, discontinuously on the same circumference of the inner peripheral surface of the cylindrical portion, and prevents the hinge portion from falling off. A sheath tube side drop prevention part,
The hinge portions are provided at both end portions of the beam, and are substantially hemispherical abutting members projecting toward the end portions of the sheath tube, and the discontinuous portions of the sheath tube-side drop prevention portion. It can be inserted toward the closed side of the sheath tube, and is rotated relative to the sheath tube with the long axis of the cut beam as the rotation axis, so that it faces the sheath tube side drop prevention portion. The hinge part side drop prevention part for preventing the hinge part from falling off,
This is a hinge structure for cut beams.   2. The hinge structure for a cut beam according to claim 1, wherein a buffer member is provided between the inner peripheral surface of the sheath tube and the outer peripheral surface of the hinge portion to buffer the contact between the two.   3. The hinge structure for a cut beam according to claim 1, wherein the sheath tube includes a plurality of shift prevention protrusions protruding from an outer peripheral surface.

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