JP7005993B2 - Gripping hardware and segments - Google Patents

Description

The present invention relates to a gripping metal fitting embedded in a concrete precast member and to which a lifting metal fitting of a lifting machine is locked, and a segment provided with the gripping metal fitting.

For example, when constructing a tunnel by the shield method, a tubular lining body is constructed while digging the ground with a shield excavator and assembling the segments gripped by the Elector device along the inner peripheral surface of the excavation pit. I will build it. In such a segment, a gripping metal fitting for locking the hanging metal fitting provided in the Elector device is embedded.

Patent Document 1 discloses a gripping device for a shield segment provided with a gripping pin, and a gripping hardware embedded in the shield segment and lockable to the gripping pin. The gripping pin has two protrusions at intervals of 180 degrees on the side peripheral surface near the tip of the cylindrical shaft portion.

On the other hand, the gripping metal fitting is installed at the bottom of a truncated cone-shaped hole formed on the inner peripheral surface of the segment and gradually shrinks in the depth direction, and covers the tubular portion having a lumen and the lower end of the tubular portion. It includes a flange portion and a thick flange portion that covers the upper end of the tubular portion. Further, in the thick flange portion, a slit having a shape similar to the cross-sectional shape at the position where the protrusion of the gripping pin is provided is formed in the center.

Then, in order to lock the gripping pin to the gripping hardware, first, the shaft portion of the gripping pin is inserted into the hole of the segment, and the protrusion of the gripping pin is passed through the slit of the gripping hardware. Next, the protrusion of the gripping pin is rotated 90 degrees in the lumen of the cylinder of the gripping hardware to move the position of the protrusion of the gripping pin with respect to the slit of the gripping hardware. Then, even if a pulling force is applied to the gripping pin, the protrusion abuts on the back surface of the thick flange portion provided at the upper end of the cylinder portion of the gripping hardware and cannot escape from the slit. As a result, the gripping pin is locked to the gripping hardware.

Special Fair 6-63440 Gazette

According to the invention of Patent Document 1 described above, it is possible to suspend the shield segment in which the gripping hardware is embedded by the gripping device. However, the gripping hardware of Patent Document 1 is composed of a cylinder portion, a flange portion covering the lower end of the cylinder portion, and a thick flange portion covering the upper end of the cylinder portion and having a slit, which is heavy and has a large material cost. As the size increases, the manufacturing cost also increases.

Further, when the gripping hardware is manufactured from a material having high thermal conductivity such as a cast product or a steel material, if a steel material having a large member thickness exists near the surface of the shield segment, the gripping metal is gripped with respect to the reinforcing bar or concrete constituting the shield segment. The structure makes it easy for heat to be transferred from hardware, which tends to be disadvantageous in terms of fire resistance.

Furthermore, if the outer shape of the gripping hardware is large, it is necessary to take a large distance between the main bars constituting the shield segment to avoid interference with the gripping hardware, and the structure is desirable from the viewpoint of dispersibility of cracks generated in concrete. Not only can it not be said, but the manufacture of shield segments is also complicated.

The present invention has been made in view of such a problem, and a main object thereof is to provide a gripping metal fitting having a compact shape and a segment having a gripping metal fitting in a simple configuration.

In order to achieve such an object, the gripping metal fitting of the present invention is a gripping metal fitting in which a hanging metal fitting having a bulging portion is locked in the vicinity of the tip portion of the shaft portion, and is provided in a concrete precast member. Installed in the middle part of the depth direction of a hanging metal fitting insertion hole having an upper hole located on the hole opening side across the middle part in the depth direction and a lower hole having a cross-sectional shape that allows the position of the bulging part to move. It communicates with the hanging metal insertion hole and penetrates the bulging portion of the hanging metal fitting, while the position of the bulging portion after penetration is moved in the lower hole to form a through hole for restricting the withdrawal. It is characterized by comprising a locking portion for locking the suspended metal, which is restricted from coming out of the through hole.

Further, in the gripping metal fitting of the present invention, the locking portion includes the lid portion and a ring portion having a central hole covered by the lid portion, and the through hole is formed in the lid portion and the lid portion is formed. The hanging metal fitting whose escape from the through hole is restricted is locked by the lid portion.

Further, in the gripping metal fitting of the present invention, the bulging portion of the hanging metal fitting bulges in two directions facing each other with the shaft portion interposed therebetween, and the cross-sectional shape of the through hole is the bulging portion of the hanging metal fitting. It is characterized in that it substantially resembles the cross-sectional shape of the position where the portion is provided.

According to the above-mentioned gripping metal fitting of the present invention, since it has a simple structure, its outer shape can be compactly accommodated as compared with the conventional gripping metal fitting. This makes it possible to reduce the weight of the gripping hardware and significantly reduce the manufacturing cost.

In addition, since the space for arranging the gripping metal to be secured when burying in the precast member can be reduced, the arrangement interval of the main bar is set in order to avoid interference between the main bar constituting the precast member and the gripping metal when manufacturing the precast member. It is possible to eliminate the troublesome work such as taking a large amount.

The gripping metal fitting of the present invention is characterized in that a rising portion is provided at the edge of the through hole.

According to the above-mentioned gripping metal fitting of the present invention, the edge of the through hole is formed thickly by the rising portion and is stiffened. For this reason, even if the bulging portion after penetrating the through hole is moved in position with respect to the through hole and the bulging portion is restricted from coming out of the through hole, a pulling force is applied to the suspended metal object. , It is possible to suppress the occurrence of damage such as deformation and cracks around the through hole.

The segment of the present invention is made of a concrete precast member, and is a segment in which the gripping metal fitting of the present invention is embedded. The lower hole is composed of an upper hole located on the hole opening side and a lower hole located on the bottom side, and the lower hole is characterized by having a cross-sectional shape that allows the position movement of the bulging portion.

Further, the segment of the present invention is characterized in that the cross-sectional shape of the upper hole is substantially similar to the cross-sectional shape of the position where the bulging portion of the hanging metal fitting is provided.

According to the segment of the present invention described above, by making the gripping hardware compact, it is possible to reduce the heat conduction to the reinforcing bars and concrete constituting the segment even if it is manufactured from a material having high heat conductivity. In addition, since the lower hole has a cross-sectional shape that allows the position of the bulge to move, the gripping hardware has a cross-sectional shape as compared with the conventional case where the bulge is moved inside the gripping hardware. The height of the concrete can be minimized to increase the concrete cover thickness from the gripping hardware to the inner peripheral surface of the segment. This makes it possible to significantly improve the fire resistance even in the segment provided with the gripping hardware.

Further, since the upper hole, which is a counterbore portion, is formed in a cylindrical shape whose cross-sectional shape resembles the cross-sectional shape of the position where the bulging portion of the hanging metal fitting is provided, the seat is formed like a conventional segment. Compared with the case where the drilling portion is formed in a truncated cone-shaped hole, it is possible to significantly reduce the cross-sectional defect of the segment.

According to the present invention, since the gripping hardware has only a simple structure including a ring portion and a lid portion, it is possible to make the outer shape thereof compact, to reduce the weight and cost, and to achieve the present invention. By providing the gripping hardware of the above to the segment, it is possible to secure a large cover thickness of concrete from the gripping hardware to the inner peripheral surface of the segment, and it is possible to greatly improve the fire resistance performance of the segment.

It is a figure which shows the outline of the segment and the hanging metal thing in embodiment of this invention. It is a figure which shows the detail of the gripping metal fitting in embodiment of this invention. It is a figure which shows the mode that the hanging metal fitting is locked with the gripping metal fitting in embodiment of this invention. It is a figure which shows the cross section of the gripping metal thing in embodiment of this invention. It is a figure which shows the cross section in the tunnel axis direction of the segment in embodiment of this invention. It is a figure which shows the cross section in the direction orthogonal to the tunnel axis of the segment held by the Elector device in embodiment of this invention. It is a figure which shows the other embodiment of the gripping metal fitting and the hanging metal fitting in embodiment of this invention.

The gripping metal fitting of the present invention is to be embedded in a precast member in advance and used when the precast member is suspended or gripped by using the hanging metal fitting provided in the lifting machine. In the present embodiment, as a concrete precast member, a segment constituting a tunnel lining body constructed by a shield method is used, and as a lifting machine, an elector device widely known as a device for lifting a segment. 1 to FIG. 6 will be referred to below, and the segment provided with the gripping metal fitting and the gripping metal fitting will be described in detail.

Prior to explaining the gripping hardware 3, the hanging hardware 41 provided in the Elector device 4 that grips the segment 1 as shown in FIG. 6 will be described. As shown in FIG. 1, the hanging metal fitting 41 includes a shaft portion 411 and a bulging portion 412 at the tip thereof, and the shaft portion 411 is rotatably installed in the elector device 4 around an axis. Further, the bulging portion 412 bulges in two directions facing each other with the shaft portion 411 sandwiched in the vicinity of the tip end portion of the shaft portion 411, and the base end surface 4121 thereof is formed in a spherical convex shape.

The gripping metal fitting 3 to which the hanging metal fitting 41 having such a shape is locked is formed of a cast part or a steel material, and as shown in FIGS. 2A and 2B, the ring portion 31 and the lid portion 32 are formed. It has a locking portion 3A with and. The ring portion 31 is a plate-shaped member formed in a circular shape in a plan view as shown in the view of the ring portion 31 in FIG. 2B from the lower surface side, and is provided with a substantially circular central hole 311 in the center. Has been done. The lid portion 32 is integrally formed so as to cover the central hole 311.

As shown in FIG. 2A, the lid portion 32 is formed on a spherical plate that is convex on the upper surface side of the ring portion 31, and a through hole 321 is provided in the central portion thereof. The shape of the through hole 321 is formed into a rectangular cross-sectional view that is substantially similar to the cross-sectional view shape of the portion where the bulge portion 412 is formed in the hanging metal fitting 41, and the bulge portion 412 can pass through without contact. It is molded to size. Further, a tubular rising portion 322 protruding toward the upper surface side of the ring portion 31 is formed on the upper surface side of the lid portion 32 and at the edge portion of the through hole 321.

The gripping metal fitting 3 having the above-mentioned shape can lock the hanging metal fitting 41 by the following procedure.

That is, as shown in FIG. 3A, both are aligned so that the bulging portion 412 of the hanging metal fitting 41 can pass through the through hole 321 of the lid portion 32, and then the upper surface side of the ring portion 31 side. The hanging metal fitting 41 is inserted into the through hole 321 of the lid portion 32. Then, as shown in FIG. 3B, the bulging portion 412 moves to the lower surface side of the ring portion 31 and is arranged in the space S on the lower surface side. The 41 is rotated by 90 degrees to move the position of the bulging portion 412 with respect to the through hole 321 of the lid portion 32.

As a result, when the hanging metal fitting 41 is pulled out toward the upper surface side of the ring portion 31, as shown in FIG. 4, the bulging portion 412 located in the space S on the lower surface side of the ring portion 31 has a base end surface 4121 as a lid portion 32. It comes into contact with the lower surface 323 of the above and is locked, and the escape from the through hole 321 is restricted. As a result, the hanging metal fitting 41 is locked to the locking portion 3A of the gripping metal fitting 3.

As described above, the gripping metal fitting 3 does not move the bulging portion 412 after penetrating the through hole 321 of the lid portion 32 inward of the gripping metal fitting 3, but is below the gripping metal fitting 3, that is, the gripping metal fitting. It is a structure to move in the space S on the lower surface side of the ring portion 31 provided in 3. Therefore, the gripping hardware 3 can be made into a compact shape as a whole by a simple structure in which the lid portion 32 is integrally formed with the ring portion 31, and the weight can be reduced and the manufacturing can be performed. It is possible to significantly reduce the cost.

As described above, a tubular rising portion 322 is provided on the edge of the through hole 321 on the upper surface side of the lid portion 32. By doing so, the edge of the through hole 321 becomes thicker by the height of the rising portion 322 than the other portion of the lid portion 32, and the opening 321 is stiffened. As a result, even when a large pulling force is applied to the hanging metal fitting 41 toward the upper surface side of the ring portion 31, it is possible to prevent damage such as deformation and cracks from occurring in the vicinity of the through hole 321 in the lid portion 32. can.

An example in which the gripping metal fitting 3 having such a configuration is applied to the segment 1 constituting the tunnel lining body will be described below.

As shown in FIG. 1, the segment 1 is a reinforced concrete precast member formed into an arc-shaped cross section, and is located on the inner peripheral surface 11 located on the inner peripheral side and the outer peripheral side when the tunnel lining body is constructed. The outer peripheral surface 12 is provided. As shown in FIG. 5, a bottomed cylindrical suspension metal insertion hole 2 extending from the inner peripheral surface 11 to the outer peripheral surface 12 side is provided at a substantially central portion of the inner peripheral surface 11.

As shown in FIG. 5, the hanging metal fitting insertion hole 2 is installed so that the gripping metal fitting 3 closes the hanging metal fitting insertion hole 2 in the intermediate portion in the depth direction, and is located on the inner peripheral surface 11 side of the hanging metal fitting 3. It has an upper hole 21 located and a lower hole 22 located on the bottom side. The hole wall of the hanging metal fitting insertion hole 2 may be in a state in which a waste formwork used for forming the hanging metal fitting insertion hole 2 when manufacturing the segment 1 is arranged, or is formed on a concrete surface. You may.

The upper hole 21 is a so-called counterbore portion, and is a cylindrical hole into which a hanging hardware 41 provided in the Elector device 4 for suspending the segment 1 is inserted. As shown in FIGS. 1 and 5, the shape is formed into a rectangular cross-sectional view that is substantially similar to the cross section of the portion where the bulging portion 412 of the hanging metal fitting 41 is formed so that the bulging portion 412 can be inserted therethrough. .. Further, the size thereof is formed so as to be larger than the through hole 321 of the gripping metal fitting 3 and smaller than the outer diameter of the ring portion 31.

In the present embodiment, as shown in FIG. 5, a tapered surface is formed in the vicinity of the hole opening in the hole wall of the upper hole 21 and the diameter increases toward the hole opening, and the hanging metal fitting 41 is formed in the upper hole 21. It functions as a guide when inserting.

On the other hand, the lower hole 22 is a region that functions as a space S shown in FIG. 3 that enables the position of the bulging portion 412 of the hanging metal fitting 41 that penetrates the upper hole 21 and the through hole 321 of the lid portion 32. As shown in FIGS. 5 and 6, the shape is formed in a circular cross-sectional view having a diameter L2 slightly longer than the long side L1 of the upper hole 21 formed in a rectangular cross-sectional view, and the hanging metal fitting 41 is formed around the shaft portion 411. The bulging portion 412 is formed in a size that does not come into contact with the hole wall when it is rotated to.

In the present embodiment, the lower hole 22 is formed in a truncated cone shape whose diameter decreases toward the bottom, and the cross section of the portion close to the gripping metal fitting 3 has a diameter L2 longer than the long side L1 of the upper hole 21. It is formed in the shape of a circle.

With respect to the above-mentioned hanging metal fitting insertion hole 2, the gripping metal fitting 3 has a posture in which the through hole 321 of the lid member 32 communicates with the hanging metal fitting insertion hole 2 and the upper surface side of the ring portion 31 faces the inner peripheral surface 11 side of the segment 1. At least the ring portion 31 is arranged so as to be embedded in the segment 1. The segment 1 having such a configuration can be lifted by the hanging metal fitting 41 of the erector device 4 by the following procedure.

First, as shown in FIG. 5, the bulging portion 412 of the hanging metal fitting 41 provided in the Elector device 4 can penetrate the upper hole 21 of the segment 1 and the through hole 321 of the lid portion 32 with respect to the segment 1. Align the hanging hardware 41. Next, the shaft portion 411 of the hanging metal fitting 41 is inserted from the upper hole 21 toward the lower hole 22 until the bulging portion 412 penetrates the through hole 321 of the lid portion 32.

After that, when the bulging portion 412 of the hanging metal fitting 41 reaches the inside of the lower hole 22, the hanging metal fitting 41 is rotated around the shaft portion 411 by 90 degrees as shown in FIG. 6, and the through hole 321 of the lid portion 32 is rotated. The bulging position of the bulging portion 412 is moved relative to the bulging portion 412. Finally, the pressing member 42 provided in the Elector device 4 is brought into contact with the inner peripheral surface 11 of the segment 1 to apply a pressing force, and the shaft portion 411 of the hanging metal fitting 41 is pulled out from the hanging metal fitting insertion hole 2. Tow.

Then, the hanging metal fitting 41 is locked to the gripping metal fitting 3, and further, by pulling the shaft portion 411 of the hanging metal fitting 41, the segment 1 is sandwiched between the pressing member 42 and the bulging portion 412 of the hanging metal fitting 41. Therefore, it is possible to lift the vehicle to the Elector device 4 in a stable state.

Further, even if the compact gripping metal fitting 3 is manufactured of a material having high thermal conductivity, it is possible to reduce the thermal conduction to the concrete 13, the main bar 14, the reinforcing bar, and the like constituting the segment 1. Further, by making the lower hole 22 function as a space S for moving the bulging portion 412 of the hanging metal fitting 41 in position, the height of the gripping metal fitting 3 is minimized, and the inner peripheral surface 11 of the gripping metal fitting 3 to the segment 1 is minimized. It is possible to secure a large cover thickness of the concrete 13 up to. As a result, even in the segment 1 provided with the gripping metal fitting 3, the fire resistance can be significantly improved.

Further, since the upper hole 21 which is a counterbore portion is formed in a cylindrical shape whose cross-sectional shape resembles the cross-sectional shape of the position where the bulging portion 412 of the hanging metal fitting 41 is provided, it is similar to the conventional segment. In addition, it is possible to significantly reduce the cross-sectional defect of the segment 1 as compared with the case where the counterbore portion is formed in the hole having a truncated cone shape.

In addition, it is not necessary to take measures such as increasing the arrangement interval of the main bars 14 in order to avoid interference between the main bars 14 constituting the segment 1 and the gripping hardware 3 as in the conventional case, as shown in FIG. It is possible to embed the gripping hardware 3 in the segment 1 while maintaining the arrangement interval of the main bars 14 in consideration of the dispersibility of cracks generated in the concrete.

The segment 1 provided with the gripping hardware 3 and the gripping hardware 3 of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the present embodiment, the ring portion 31 constituting the locking portion 3A of the gripping hardware 3 is formed in a circular shape, but the present invention is not limited to this, and may be formed into, for example, a square ring. Further, the lid portion 32 constituting the locking portion 3A of the gripping metal fitting 3 is formed in a spherical shape so as to follow the shape of the base end surface 4121 of the bulging member 412 provided in the hanging metal fitting 41, but the present invention is not necessarily limited to this. The lid portion 32 may be formed in any plate shape as long as the base end surface 4121 of the bulging member 412 and the lower surface 323 of the lid portion 32 have a shape that allows contact between the surfaces.

Specifically, as shown in FIG. 7A, when the base end surface 4121 of the bulging member 412 provided on the hanging metal fitting 41 is flat, the gripping metal fitting 3 is as shown in FIG. 7B. The flat plate material that follows the shape of the base end surface 4121 of the bulging member 412 may be used as the locking portion 3A in which the lid portion 32 and the ring portion 31 are integrated.

Further, the through hole 321 of the lid portion 32 and the upper hole 21 of the segment 1 are not necessarily limited to a rectangular cross-sectional view, and are appropriately modified so as to correspond to the cross-sectional shape of the bulging portion 412 provided in the hanging metal fitting 41. It is possible.

In addition, in the present embodiment, the hanging metal fitting 41 is rotated around the shaft portion 411 to move the position of the bulging portion 412, so that the base end surface 4121 of the bulging portion 412 holds the locking portion 3A of the gripping metal fitting 3. The through hole 321 of the lid portion 32 is formed so as to abut on the lower surface 323 of the lid portion 32, but the present invention is not limited to this. For example, the through hole 321 is formed in a T shape, the shaft portion 411 is moved in a direction parallel to the lid portion 32, and the bulging portion 412 is moved in position with respect to the through hole 321. It may be configured to restrict the protrusion of the bulging portion 412.

In this way, the bulging portion 412 of the hanging metal fitting 41 that has passed through the through hole 321 and is arranged in the lower hole 22 is moved in any direction with respect to the through hole 321. As long as the base end surface 4121 can be brought into contact with the lower surface 323 of the lid portion 32, the shape of the through hole 321 may be any shape, and the movement direction of the bulging portion 412 may be any. In this case, if necessary, the upper hole 21 may also have a cross-sectional view shape so that the shaft portion 411 can move.

Further, in the present embodiment, the cross-sectional shapes of the upper hole 21 and the lower hole 22 of the hanging hardware insertion hole 2 provided in the segment 1 are different, but the cross-sectional shape is not necessarily limited to this. The gripping metal fitting 3 does not come out of the upper hole 21, and the lower hole 22 makes the base end surface 4121 of the bulging portion 412 in the hanging metal fitting 41 to the lower surface 323 of the lid portion 32 constituting the locking portion 3A of the gripping metal fitting 3. As long as the bulging portion 412 has a cross-sectional shape that allows the bulging portion 412 to be moved so as to be able to come into contact with each other, both may be formed into a shape having the same cross-sectional shape.

1 Segment 11 Inner peripheral surface 12 Outer peripheral surface 13 Concrete 14 Main bar 2 Suspended hardware insertion hole 21 Upper hole 22 Lower hole 3 Holding hardware 3A Locking part 31 Ring part 311 Central hole 32 Lid part 321 Through hole 322 Rising part 323 Bottom surface 4 Elector Device 41 Suspended metal fittings 411 Shaft part 412 Protruding part 4121 Base end surface 42 Pressing member

Claims (6)

A gripping hardware to which a hanging hardware having a bulging portion is locked near the tip of the shaft portion.
Suspended hardware insertion hole provided in a concrete precast member, which includes an upper hole located on the hole opening side across an intermediate portion in the depth direction and a lower hole having a cross-sectional shape that allows the position of the bulging portion to move. Installed in the middle part in the depth direction,
While communicating with the hanging hardware insertion hole and penetrating the bulging portion of the hanging metal fitting, the position of the bulging portion after penetration is moved in the lower hole to form a through hole for restricting the withdrawal.
A gripping metal fitting provided with a locking portion for locking the hanging metal fitting whose escape from the through hole is restricted. In the gripping hardware according to claim 1,
The locking portion comprises the lid portion and a ring portion having a central hole covered by the lid portion.
A gripping metal fitting characterized in that a through hole is formed in the lid portion and the hanging metal fitting whose escape from the through hole is restricted is locked by the lid portion. In the gripping hardware according to claim 1 or 2,
The bulging portion of the hanging metal piece bulges in two directions facing each other with the shaft portion interposed therebetween.
A gripping hardware characterized in that the cross-sectional shape of the through hole is substantially similar to the cross-sectional shape of the position where the bulging portion of the hanging metal fitting is provided. In the gripping hardware according to any one of claims 1 to 3,
A gripping hardware having a rising portion at the edge of the through hole. A segment made of a concrete precast member and in which the gripping hardware according to any one of claims 1 to 4 is embedded.
The suspension metal insertion hole is formed in the shape of a bottomed cylinder, and is composed of an upper hole located on the hole opening side and a lower hole located on the bottom side of the gripping metal.
A segment characterized in that the lower hole has a cross-sectional shape that allows the position of the bulge to move. In the segment according to claim 5.
A segment characterized in that the cross-sectional shape of the upper hole is substantially similar to the cross-sectional shape of the position where the bulging portion of the hanging metal fitting is provided.

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