JP5508191B2 - Reinforcing bar support bracket for construction of underground structures - Google Patents

Description

  The present invention relates to a reinforcing bar support fitting for underground structure construction that fixes a reinforcing bar to a wall surface of an underground structure during construction of an underground structure in construction such as a tunnel, a river, a harbor, or a building.

  For example, in tunnel construction, after drilling a tunnel in a natural ground, the primary lining concrete is sprayed on the inner surface, and then a water-impervious waterproof sheet is applied to the surface, and a nail is placed in its place. It is attached by fastening, and then a part of the waterproof sheet is perforated, a reinforcing bar support metal fitting is located there, and it is fixed to the supporting work exposed from the primary lining concrete by welding or the like. A mold was constructed, and then a concrete for secondary lining was placed between the waterproof sheet and the concrete mold.

  However, with such a construction method, it is difficult to sufficiently prevent water leakage even if a sealing material is interposed in the perforated portion of the waterproof sheet, and spring water from the natural ground leaches out to the secondary lining concrete side. This causes the destruction of the concrete layer due to the expansion of the road surface in the tunnel and the spring water that has penetrated into the concrete layer.

  Therefore, as a technique for supporting the reinforcing bars without drilling in the waterproof sheet, a technique has been proposed in which the base metal is welded to the support and the suspended reinforcing bars are locked to the base metal with a hinge-shaped locking member. (For example, refer to Patent Document 1).

JP 2000-34899 A

  According to the technique described in Patent Document 1, the reinforcing bar support bracket can be attached to the surface of the waterproof sheet by a simple operation without making a hole in the waterproof sheet. However, there are the following points to be improved. It was.

  In other words, the hook-shaped holder is simply a function of locking the female thread member for supporting the rebar provided on the hinge piece so that the hinge piece does not bend, and the function of pressing the waterproof sheet to the base metal fitting is Did not have. Therefore, the waterproof sheet after constructing the reinforcing bar mounting bracket easily floats from the front surface of the base bracket, and therefore, there is a problem that the waterproof sheet is likely to be kinked. In addition, since a cylindrical member is used as a female screw member for attaching a suspended reinforcing bar, there is a problem that a special part processing as a female screw member is required, and a part processing cost becomes expensive.

  The present invention solves such problems, and securely presses and fixes the waterproof sheet to the base metal fitting to prevent the waterproof sheet from being kinked, and to reduce the cost of processing parts of the female screw member. An object is to provide a reinforcing bar support metal fitting for underground structure construction.

In order to achieve the above object, the reinforcing bar support for construction of an underground structure according to claim 1 is formed by engaging both sides of a vertical substrate and forming locking portions facing each other inward and fixed to the front surface of the support work. A pair of left and right parts that are fitted together with the waterproof sheet between the locking portion and the substrate when the waterproof sheet is deployed from the folded state in which the waterproof sheet is positioned between the base metal fitting and the base metal fitting . A hinge-shaped locking member having a hinge piece, a locking pin protruding from the front surface of the one hinge piece, and detachably mounting an operating rod, and protruding from the front surface of the other hinge piece, and the female screw member for screwing, rotatably attached to the locking pin, in underground construction construction reinforcing bar support bracket having a hook-shaped holding piece which is engaged with the female screw member, said holding piece , Turn the locking pin in place The holding piece that holds the pair of hinge pieces in the expanded state is configured such that when the holding piece is rotated and locked to the female screw member in the expanded state, the waterproof sheet is attached to the base metal fitting. This is characterized in that it is pressed against and held on the front surfaces of the two locking portions .

  A reinforcing bar support fitting for underground structure construction according to claim 2 is a reinforcing bar support fitting for underground structure construction according to claim 1, wherein the female screw member is constituted by a square nut. It is.

  According to the present invention, the waterproof sheet can be pressed and fixed to the base metal fitting by the holding piece, so that the waterproof sheet is less likely to be kinked, and the reinforcing bar support metal fitting can be securely attached in a tensioned state. Moreover, by using a square nut as a female thread member for attaching a suspended reinforcing bar, a commercially available square nut can be used, and the part processing cost can be reduced.

It is a front perspective view which shows embodiment of the reinforcing bar support bracket for underground structure construction of this invention. It is a top view which shows the attachment process of the waterproof sheet by the reinforcing bar support metal fitting for underground structure construction. It is a top view which shows the attachment completion state of the waterproof sheet by the reinforcing bar support metal fitting for underground structure shown.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front perspective view showing an embodiment of a reinforcing bar support fitting for underground structure construction according to the present invention.
A reinforcing bar support fitting for underground structure construction according to the present invention (hereinafter referred to as a reinforcing bar support fitting) includes a base fitting 10 and a hinge-shaped locking member 20. The base metal fitting 10 is formed in a substantially C shape having opposing U-shaped cross-section locking portions 12 and 12 on both sides formed by folding both side ends of a square substrate 11 forward and inward at a right angle of 2 degrees. It is. The hinge-shaped locking member 20 is formed by pivotally attaching the end edges of two rectangular hinge pieces 20a, 20b with a pivot 23 that faces in the vertical direction. The hinge pieces 20a and 20b are chamfered at all corners so as to prevent the waterproof sheet from being broken at the portion where it hits the waterproof sheet.

A support pin 28 as a locking pin is fixed to the center of the front surface of one hinge piece 20a by welding, and a female screw member 26 facing forward is fixed to the center of the front surface of the other hinge piece 20b by welding. A plate-shaped holding piece 29 having a substantially hook shape on the front surface is rotatably attached to the support pin 28. Holding piece 29, it moves before and after Ri by the stop ring 30 which is fixed to the support pin 28 is restricted. That is, the holding piece 29 is attached so as to rotate at a fixed position of the support pin 28.

The female thread member 26 is screwed with a suspended reinforcing bar 25 having a male thread 25a cut over its entire length. A cylindrical operating rod 24 is detachably inserted into the support pin 28.
If a square nut 26 as shown in the figure is used as the female screw member 26 for screwing the suspension rebar 25, a commercially available member can be used, and it is not necessary to use a special processed part as the female screw member 26. Product. However, the female screw member 26 may have a cylindrical shape or any other shape.

  2 is a plan view showing a state in the middle of attaching the hinge-shaped locking member 20 of the reinforcing bar support metal fitting shown in FIG. 1 to the base metal fitting 10, and FIG. 3 is a plan view showing a use state of the reinforcing bar support metal fitting of the present invention. is there.

  The base metal fitting 10 is fixed to the support 40 exposed from the primary lining concrete 30 sprayed onto the surface of the tunnel drilled in the ground by welding or the like.

  Next, in a state where a part of the waterproof sheet 50 is applied to the front part of the base metal fitting 10, the hinge pieces 20a and 20b are slightly bent as shown in FIG. By pulling the operating rod 24 and the suspension rebar 25 with both hands, the hinge pieces 20a, 20b are spread out into a flat state and fitted into the locking portions 12, 12 of the base metal fitting 10. Next, the holding piece 29 is rotated and locked to the female screw member 26, whereby the waterproof sheet 50 is sandwiched between both ends of the holding piece 29 and the front surface of the base metal fitting 10 as shown in FIG. The sheet 50 is securely pressed and fixed to the base metal fitting 10. In this way, the setup rebar 25 can be attached easily and reliably without perforating the waterproof sheet 50.

  Next, the operation rod 24 is removed from the support pin 28, and the tip of the suspension rebar 25 is welded to the set-up rebar 60, or is fastened with a wire or a fixing bracket, so that the set-up rebar 60 is suspended.

  When removing the hinge pieces 20a and 20b from the base metal fitting 10, the holding piece 29 is rotated counterclockwise to unlock the female screw member 26, and the operating rod 24 and the suspension rebar 25 are expanded left and right. As shown in FIG. 2, the hinge pieces 20 a and 20 b of the base metal fitting 10 are bent and can be easily detached from the base metal fitting 10.

  As shown in FIG. 1, positioning protrusions 11 a and 11 b protruding forward are formed on the upper end portion and the lower end portion of the substrate 11 of the base metal fitting 10, so that the hinge-like engagement is sandwiched between the waterproof sheets 50. When the stop member 20 is locked to the base metal fitting 10, the hinge pieces 20a and 20b can be easily positioned vertically, which is particularly effective when the waterproof sheet is opaque. However, the present invention can be implemented without the positioning protrusions 11a and 11b (FIGS. 2 and 3 are examples in which the positioning protrusions 11a and 11b are not provided).

  As described above, in the reinforcing bar support metal fitting of the present invention, the holding piece 29 has a function of holding the waterproof sheet 50 together with holding the hinge pieces 20a and 20b in an expanded state. It is possible to prevent the base metal fitting 10 from floating and twisting, and to keep the waterproof sheet in a good stretched state. Further, by using the square nut 26 as the female screw member 26, a commercially available member can be used, and it is not necessary to use a special processed part as the female screw member 26, so that the product can be made inexpensively.

DESCRIPTION OF SYMBOLS 10 Base metal fitting 11 Board | substrate 12 Locking part 20 Hinge-shaped locking member 20a, 20b Hinge piece 24 Operation rod 25 Suspension bar 26 Female screw member 28 Support pin 29 Holding piece 40 Supporting work 50 Waterproof sheet

Claims (2)

From the folded state in which the both sides of the vertical board are folded back and the inward locking portions are formed, the base bracket fixed to the front surface of the support work, and the waterproof sheet is positioned between the base bracket A hinge-shaped locking member having a pair of left and right hinge pieces inserted together with the waterproof sheet between the locking portion and the substrate when deployed in a deployed state, and protruding on the front surface of the one hinge piece A locking pin for detachably attaching the operating rod, a female screw member projecting on the front surface of the other hinge piece, and screwing a suspension rebar, and being rotatably attached to the locking pin, the female screw member Reinforcing bar support bracket for construction of underground structure with hook-shaped holding piece locked to
Attach the holding piece to rotate at a fixed position of the locking pin,
When the holding piece is rotated and locked to the female screw member in the unfolded state, the holding piece for holding the pair of hinge pieces in the unfolded state causes the waterproof sheet to be attached to both locking portions of the base metal fitting. Reinforcing bar support bracket for construction of underground structures, characterized in that it is pressed against the front and held .   The rebar support metal fitting for underground structure construction according to claim 1, wherein the female screw member is constituted by a square nut.

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