JPH0644967Y2 - Precast concrete formwork - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a precast concrete formwork mainly used for construction of an underground wall or an underground beam.

[Problems to be solved by the device]

In the formwork work in concrete work, the method of using the precast concrete formwork as a permanent formwork as it is and eliminating the demolding work has been conventionally performed in order to eliminate the complexity of formwork assembly and dismantling work. However, recently, a method has been proposed in which a reinforcing bar embedded in a mold is made to project inward to manufacture the mold so as to omit the rebar work on site.

However, since these precast molds are usually expected to have a proof stress in the concrete part, the member thickness is large and the weight is disadvantageous.In addition, it is not possible to confirm the filling status of the concrete, Since the mounting position of the (registered trademark) foam tie is predetermined, there are some inconveniences such as being unable to cope with construction errors at the site.

The present invention was made in view of the actual situation of such a conventional precast formwork, and mainly aims to newly propose a formwork suitable for underground construction.

[Means for Solving the Problems]

In the present invention, focusing on the fact that no surface finish is required for the underground skeleton, the buried mold is composed of a concrete frame on the outer periphery and a mesh attached to the opening on the inner periphery of this frame. As a result, the weight can be reduced, and it is possible to check the concrete placement status and cover thickness, and further increase the degree of freedom in attaching the foam ties.

The frame has a required plate thickness and plate width, wraps around the outer peripheral portion in a short shape, and the reinforcing bar is also laid and embedded inside.

The mesh is embedded in the frame and stretched in the opening with the peripheral portion engaged with the reinforcing bar.

〔Example〕

 The present invention will be described below with reference to the drawings showing an embodiment.

As shown in FIG. 1, a precast concrete formwork A (hereinafter, formwork A) of the present invention is composed of a concrete frame 1 on the outer periphery and a mesh 2 attached to its opening. Is used for.

The frame 1 has a required plate thickness and plate width capable of resisting the lateral pressure of the poured concrete, and circulates in a short shape. Reinforcing bars 3 are arranged along the shape inside.

The mesh 2 is embedded in the frame 1 while being engaged with the reinforcing bar 3 as shown by the peripheral portion, and is attached to the opening.

The mesh 2 is made of metal mesh such as steel mesh, organic fibers such as nylon and vinylon, inorganic fibers such as glass fiber, etc. are knitted in a mesh shape. May be turned into.

The outer periphery of the frame 1 is shown in FIG.
Joints are formed if necessary as shown in II.

FIG. 3 shows an example of use of the form A. The form A is assembled vertically and horizontally as shown in the drawing, and is held by the vertical crosspiece 4, the foam tie 5 and the separator 6, but by having the mesh 2, the separator 6 is positioned within the range of the main reinforcement in the concrete 7. It can be bridged to any position regardless.

With this mesh 2, it is possible to visually confirm the filling state of the concrete 7 and the presence of voids, and since the plate thickness of the frame 1 of the form A is added to the cover thickness, this can be sufficiently secured. .

As shown in FIG. 3-I, the form A is tightly connected to the vertical rails 4 in the mesh 2 by the number lines 8 or the like for the purpose of preventing overturning, as shown in FIG.

[Effect of device]

The present invention is as described above, and since it has a mesh in the center, the weight is significantly reduced and it is easy to handle, and as described above, the concrete filling status is confirmed and the separator is placed at an arbitrary position. It can be installed.

[Brief description of drawings]

1-I, II, and III are front views, cross-sectional views, and cross-sectional views in the direction orthogonal to them, respectively, showing a manufacturing example of this mold, and FIGS. , Fig. 3 -I, II are a longitudinal sectional view and a plan view, respectively, showing the assembled state of the formwork. A: precast concrete formwork, 1 ... frame, 2 ... mesh, 3 ... reinforcing bar, 4 ... vertical bar, 5 ...
… Form tie, 6 …… Separator, 7 …… Concrete, 8 …… Line.

Claims (1)

[Scope of utility model registration request] 1. A precast concrete buried formwork, which has a required thickness and width and is made of a concrete frame which circulates in a rectangular shape, and a reinforcing bar which is circumscribed and embedded in the frame. A precast concrete formwork consisting of a mesh that is embedded here in the state where the parts are engaged and that is attached to the opening surrounded by the frame.