JPH0475971B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a brace used as a truss material for heavy temporary structures such as temporary piers and temporary structures that undergo reverse relaxation due to severe repeated loads, vibrations, etc. The present invention relates to a support device.

``Conventional technology'' Conventionally, angle steel has been widely used for the truss materials of these heavy temporary structures, but since it sag due to its own weight, it shakes when a vehicle passes, causing great anxiety in its use. Therefore, recently, the aforementioned turnbuckle braces have been increasingly used instead of this, and they can be used with proper tension, so there is less shaking and are safe, but since they are subject to repeated loads, vibrations, etc. over a long period of time, Since the turnbuckle body was reversed and tension loosened frequently, it was necessary to perform periodic inspection and tightening.

In other words, a platform for accessing work vehicles such as dump trucks and crane trucks to foundation construction sites that support heavy objects;
In heavy temporary structures such as temporary piers, vertical columns and cross members are subjected to severe repeated loads due to the operation of dump trucks and cranes moving on the covered plates that have been laid, and the operation of power shovels working directly below the structure. To avoid vibrations, diagonal members are installed between the pillars to form a truss and reinforce it. The upright columns, cross members, and brace members of the above structure are connected by bolts, welding, or vice-like clamping fittings, but in any case, they are subject to the above-mentioned repeated loads and vibrations. Such loads and vibrations are applied to the brace material, which applies compressive, tensile, and bending stress to the brace material, so if a profile is used for the brace material, it will bend due to plastic deformation and will be difficult to restore, resulting in cracks and separation at the joints at both ends. etc. are likely to occur. To solve this problem, if a turnbuckle is interposed in the brace material and tension is applied in the longitudinal direction, the above-mentioned curvature can be easily restored and the resistance and strength to loads and vibrations can be improved. However, due to the vibration due to repeated compression and tension in the longitudinal direction of the brace and the vertical vibration, the turnbuckle rotates along the threaded part and the screw thread, causing the turnbuckle to screw into both ends of the turnbuckle. There was a defect in which the threaded part of the brace slid to the outside of the turnbuckle, causing the brace to loosen and curve downward, releasing the tension and making it difficult to withstand the above loads and vibrations (Special Publication No. 58-2307
issue).

"Problems to be Solved by the Invention" An object of the present invention is to provide a brace support device for a heavy temporary structure that can withstand repeated loads and vibrations and is less likely to loosen.

"Means for Solving the Problems" The present invention is directed to erecting and supporting a brace with a turnbuckle interposed in the middle as a truss material for a heavy temporary structure such as a temporary pier or temporary trestle that is subjected to repeated loads, vibrations, etc. A protrusion having at least one flat outer surface along the longitudinal direction of the brace is formed at the distal end of the brace screwed into the turnbuckle, and has a through hole having substantially the same shape as the outer surface of the protrusion. A metal fitting is provided which is fitted into the protrusion through the through hole and is unrotatably supported at the distal end of the brace, and the metal fitting is provided with a metal fitting that protrudes outward from the side opening of the turnbuckle and extends to the side opening end of the turnbuckle. A brace support device in a temporary structure characterized by a projecting arm that can be engaged with the brace support device.

"Action" The heavy temporary structure 1 formed by the upright columns 4, cross members 6, braces 3, top cover plate or floor plate 7, etc. is repeatedly operated by the dump truck 9, crane truck 8, etc. that has entered the top surface. The brace 3 is subjected to loads, shocks and vibrations, and these forces act on the brace 3. However, since tension is applied to this brace 3 in the longitudinal direction by the turnbuckle 2, even if it is subjected to repeated compression and tension in the longitudinal direction or repeated bending in the right angle direction (vertical direction), the same The original straight state can be restored within the elastic limit of 3. Then, due to the tension, compression, and vertical bending, the turnbuckle 2 receives rotational inertia along the screw thread toward the return side due to the loosening of the screw, and tries to rotate toward the return side, but it is supported by the end of the brace inside the buckle 2. Since the metal fitting 5 engaged with the buckle 2, inertial rotation of the buckle 2 is prevented. Therefore, the buckle 2 and the brace 3 are prevented from sliding against each other in the longitudinal direction, and the tension of the brace 3 is maintained. Therefore, even if the brace 3 is subjected to repeated loads such as tension, compression, bending, etc., it can be restored to its linear shape by the tension force.

"Example" A standing pillar 4 is buried in the ground, the ground is excavated, a horizontal member 6 is erected on the standing pillar 4, a cover plate or a floor board 7 is laid on the top surface, and an upright surface and a horizontal surface are installed between the standing pillars 4. A truss is formed by erecting braces 3 along the truss, thereby forming a heavy temporary structure 1 such as a temporary pier or a temporary trestle shown in FIGS. 1 and 2. Heavy workers such as a crane truck 8 and a dump truck 9 operate and travel on the cover plate or floor plate 7, and a power shovel 10 operates on the excavated ground below, so the structure 1 is subject to repeated loads, shocks, and vibrations. receive the same force. Such forces act repeatedly on the brace 3 as tensile, compressive and bending forces. As shown in Figs. 1 and 2, this brace 3 has two steel bars 3', 3' arranged on the same center line a, and formed at opposite ends of the steel bars 3', 3'. Both steel bars 3', 3' are connected by screwing male screws 11, 11 in opposite directions into female screws 12, 12 in opposite directions formed at both ends of the turnbuckle 2, and connecting both steel bars 3'. A flat plate 13 is welded to the other ends of the steel rods 3', 3', bolt holes 14 are bored in the flat plate 13, and the bolts inserted into the holes 14 are used to connect the other ends of the steel rods 3', 3'. As shown in Fig. 1, two braces 3, 3 are fixed to the vertical pillars 4, 4 directly or indirectly through a cross member 6, and two braces 3, 3 are installed between the vertical pillars 4, 4 so as to cross each other. . Therefore, the steel rods 3', 3' are fixed in rotation about the center line a, and the turnbuckle 2 can be rotated about the center line a to apply tension to the brace 3.
A projection 15 having at least one flat outer surface 15' along the longitudinal direction of the brace is provided at the tip of at least one steel rod 3' screwed into the buckle 2, and a transparent projection 15 formed in the metal fitting 5 is provided. The hole 16 is fitted into the protrusion 15 in a male-female manner. The cross-sectional shapes of the protrusion 15 and the through hole 16 are male and female, and the outer surface 15' and the inner surface 16' serve as opposing surfaces for preventing the metal fitting 5 from rotating around the center line a of the steel rod 3'. The protrusion 15 and the through hole 16 are formed in a hexagonal shape (FIG. 3), a quadrangular shape (FIGS. 4 and 5), a semicircular shape (FIG. 6), or an oval shape, or the protrusion 15 and Through hole 16
It is also possible to form a cylindrical shape and form concave and convex strips that fit into each other. By fitting the metal fitting 5 thus constructed into the projection from the side opening of the brace 3, the metal fitting 5 is fixed without rotating around the center line a of the steel rod 3'. And this metal fitting 5 is shown in Figure 3.
As shown in FIGS. 4, 7, and 8, arms 5' and 5' are provided that engage with the open ends of the side surfaces of the turnbuckle 2 in the rotating direction, so that the turnbuckle 2 is aligned with the center line a of the steel rod 3'. The movement of rotation around the is prevented. In the figure, numeral 17 indicates a sliding prevention pin for the metal fitting 5, and numeral 18 indicates a hole for the pin.

"Effects" Since the present invention has the above-described structure, if the metal fitting is inserted and fitted into the protrusion at the tip of the brace at the position where the turnbuckle is rotationally fixed, the turnbuckle can be prevented by repeated loads, vibrations, etc. Even if the rotation is reversed, the arms of the metal fittings engage to prevent further rotation, so there is little risk of the brace loosening or bending, and the brace can sufficiently withstand repeated loads such as tension, compression, and bending, as well as vibration. That's what you get.

Furthermore, when inserting a metal fitting, all you have to do is match the shape of the through hole of the metal fitting to the outer surface shape of the protrusion at the tip of the brace, and insert and fit the metal fitting into the protrusion through the side opening of the turnbuckle. There is no need for accurate alignment between the turnbuckle and the turnbuckle, and the installation work is easy.

In addition, the present invention supports the metal fitting in an unrotatable manner by mating the protrusion with a through hole of the metal fitting having substantially the same shape as the outer surface of the protrusion, and prevents rotation of the turnbuckle by an arm protruding from the metal fitting. Since this prevents the turnbuckle from reversing due to strong vibrations of the heavy temporary structure, the mounting strength of the metal fittings is high and it is possible to reliably prevent the turnbuckle from reversing due to severe vibrations of the heavy temporary structure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a temporary structure using the brace support device of the present invention, FIG. 2 is a perspective view of the turnbuckle brace, FIGS. 3 and 4 are perspective views of the turnbuckle screw end and metal fittings, Figures 5 and 6
The figure is a perspective view of an embodiment of the threaded end, FIG. 7 is a vertical sectional view taken along the line A-A in FIG. 2, FIG. 8 is a longitudinal sectional view of another embodiment of FIG. 7, and FIG. It is a side view of a heavy temporary structure. 1...Heavy temporary structure, 2...Turnbuckle,
3...Brace, 4...Standing pillar, 5...Metal fittings, 5'
...Arm, 15...Protrusion, 15'...Outside surface, 16
...through hole.

Claims (1)

[Claims] 1. In a device that erects and supports a brace with a turnbuckle interposed in the middle as a truss material for a heavy temporary structure such as a temporary pier or temporary gantry that is subject to repeated loads, vibrations, etc., the tip of the brace screwed into the turnbuckle. A protrusion having at least one flat outer surface along the longitudinal direction of the brace is formed on the brace, and has a through hole having a shape substantially the same as the outer surface shape of the protrusion, and the male and female engage with the protrusion through the through hole. A metal fitting is provided at the distal end of the brace to be unrotatably supported, and the metal fitting has an arm protruding from the side opening of the turnbuckle and capable of engaging with the end of the side opening of the turnbuckle. Brace support device for temporary structures characterized by: