JP3187763B2 - Top-end indicator for cast-in-place concrete on half precast slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a slab for RC or SRC construction and the like, in which a half precast slab is erected between beams as a structural material, and an in-situ casting concrete is provided above the slab. The half precast slab for accurately and efficiently and rationally display the cover thickness of the cast-in-place concrete at the time of casting to reduce labor and cost of construction work. And a top end indicator of a concrete in-place concrete.

[0002]

2. Description of the Related Art Conventionally, in the construction of concrete floors of this type of RC construction or SRC construction, as shown in FIG. Means and method for adjusting the height of a concrete top end, that is, a resilient and resilient synthetic resin display C for displaying the cover thickness of the concrete so that the display C can be moved up and down each time. Are used.

[0003]

In the above conventional method,
It is troublesome, has poor work efficiency, or is easy to loosen, and it is difficult to obtain accuracy, including complicated construction and work at the construction site, such as height adjustment for displaying bolting to the reinforcing bar and concrete top. Further, it is economically disadvantageous and has many practical problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned conventional problems, and has been described in connection with the construction of a site-casting concrete in a half precast slab method. By saving labor and rationalizing the thickness display work, troublesome work such as bolting is not required, and it is possible to finish easily, easily and with high construction accuracy, and economically advantageous half precast. It is an object of the present invention to provide a top-end indicator for a cast-in-place concrete on a floor slab.

[0005] As means for this, a C-shaped mounting body having an upper piece and side pieces substantially inclined to the left and right and having an open bottom is provided, and an appropriate length protruding upward from the center of the upper piece of the mounting portion. An elastic shaft portion mounted upright and a marking device appropriately pressed to the upper end of the elastic shaft portion, and a central portion of the side piece of the mounting body is cut open to protrude inward in a C-shape. It is characterized in that the use spring piece is formed integrally.

[0006] The above structure eliminates the need for bolting and troublesome height adjustment work on the upper chord bars and slab reinforcing bars of the half precast floor slab, and construction with relatively high finishing accuracy is expected. In addition, the present invention solves the above-mentioned conventional problems and achieves the above-mentioned object, such as achieving economic advantage and shortening the construction period by labor saving and rationalization.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a top end indicator of a cast-in-place concrete in a half precast slab according to an embodiment of the present invention, and FIG. 2 is a central longitudinal sectional view of a part of FIG. Reference numeral 1 shown in the figure denotes an attachment body made of a steel plate or the like having a moderate spring property as a whole, which is bent with an upper piece 2 and side pieces 3.3 which are substantially inclined to the left and right, and which is open in the downward direction. It has a shape. A mounting hole 4 is formed in the center of the upper piece 2 and locking springs are formed in the left and right side pieces 3.3 by cutting out the center and projecting inward in a C-shape. The piece 5 is formed integrally.

Reference numeral 6 denotes an elastic shaft portion made of plastic or the like to be mounted in the mounting hole 4 provided in the upper piece 2 of the mounting body 1. A retaining portion 7.8 is provided at an appropriate position at the lower and lower ends of the shaft portion. Are formed integrally, and the mounting hole 4 of the mounting body 1 is formed.
Is inserted from below, and is fixed by the retaining portion 8 at the lower end while passing through the retaining portion 7, and is mounted upright. Numeral 9 denotes a plastic marking tool which is press-fitted into the upper portion of the elastic shaft portion 6 and has a press-fit hole 10. Head 11
And the marking piece 12 are integrally formed.

Referring to FIG. 3, a description will be given of a method of using a top end display of a cast-in-place concrete in a half precast slab according to the embodiment of the present invention. A half precast floor slab F, which has been produced in advance in a factory, is installed between beam forms (not shown) at a construction site. When the mounting body 1 is pushed into the intersection of the upper chord H and the lattice L of the truss G protruding from the upper surface thereof, the locking spring piece 5 protruding inward is inserted into the lattice by pushing the mounting body 1 from the upper muscle. Muscle I
, And can be locked and fixed below the intersection with the upper chord muscle H.

Next, the reinforcement J. is placed on the upper chord H of the truss G of the half precast floor slab F. Arrange the bars crossing J and complete the preparation for placing the concrete in place. K in the figure is the concrete when casting in-place concrete.
The in-situ casting concrete L is for placing the marking piece 12 provided on the top end of the marking tool 9 as a target. . At this time, a leveling rod or the like may be placed on the head 11 of the marking tool in order to confirm the concrete placing top.

[0011] At this time, even if a pressure feed pipe, a hose, or the like for placing concrete hits the display, the display temporarily bends, but the composite has elasticity or resilience. Since it is made of resin, the pumping tube, the hose and the like come off, and at the same time, it stands up and returns to its original shape, so that the cover thickness K of the predetermined concrete is always displayed and can be set as a target. After curing the concrete, the marking piece 12 is cut off from the top of the concrete and processed.

In addition, the top end indicator according to one embodiment of the present invention has a reinforcement J.S. At any time, before or after the arrangement of the J bars, the mounting operation can be performed simply, easily and quickly, and no tools are required for mounting. Furthermore, since the display device according to the present invention is merely mounted on the intersection of the truss muscle and the upper chord muscle, it is possible to expect significant labor saving and rationalization of the work.

[0013]

As described above in detail, according to the top end indicator of the cast-in-place concrete in the half precast floor slab of the present invention, it is possible to bolt the truss bar as in the conventional product, There is no need to adjust the height, and no tools are required, so that anyone can easily, easily, and quickly mount. Also, it can be installed at any time, regardless of the timing and timing of mounting. In addition, it has moderate elasticity and resilience, so it can always secure a stable and constant concrete cover thickness with high accuracy, and it has the effect of excelling in display function. In-situ casting concrete for half precast slabs, which can be expected to have a remarkable effect and are practically useful such as shortening the construction period and reducing costs
Can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a top end display device according to an embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view in FIG. 1;

FIG. 3 is a side view showing an example of use of a top end indicator according to one embodiment of the present invention.

FIG. 4 is a front view of a top end display according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment body 2 Upper piece 3 Side piece 5 Spring piece 6 Elastic shaft part 9 Marking tool F Half precast slab G Truss bar H Upper chord bar I Lattice bar

Claims (1)

(57) [Claims] 1. A C-shaped mounting body having an upper piece and side pieces substantially inclined to the left and right and having a downwardly open shape, and a standing portion protruding upward from a central portion of the upper piece at an appropriate length. A locking spring, which comprises an elastic shaft portion mounted and mounted, and a marking tool appropriately crimped to the upper end of the elastic shaft portion, wherein a center portion of each side of the mounting body is cut open to protrude inward in a C-shape. A top end indicator for a cast-in-place concrete in a half precast slab, wherein the pieces are integrally formed.