JPH028417A - Regular form holding device for upper form for sloping form - Google Patents

Abstract

PURPOSE:To make loading and unloading easy and to prevent deformations of an upper form by hanging and stopping the basic end of a regular form holding device consisting of a L type hook material and a linear short material. CONSTITUTION:Cross bars 32 of a lower form placed on a face of the slope are inserted in the basic ends of a L type hook material 11 and a linear short material 12 to stop, a bolt 12b projected to the free end of the short material 12 is inserted in the free end of the hook material 11 to tighten with a nut, and a deformation of an upper form 2 is constrained. In case there are step falls in the outside of bending sections of side forming surfaces 21, 22 and a top forming surface 23 of the upper form 2, square bars 13 and 13 are secured to corresponding places of the hook material 11 of a regular form holding device 1, and the step falls are substantially eliminated by housing the square bars 13 and 13 in places having the step falls.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shape holding device for an upper form for a legal framework, which is used to maintain the shape of an upper form for pouring concrete on site.

<Conventional Technology> Generally, when constructing a concrete legal framework, a semi-cylindrical upper formwork is used.

The upper formwork used when constructing a general upper slope frame with a rectangular cross section has three molding surfaces for forming the top surface and both sides of the slope frame, and these three molding surfaces is made of a rigid material such as iron, aluminum, resin, or wood, and has an upper formwork in which the boundaries of each molding surface are connected in a bendable manner.

<Problems to be Solved by the Present Invention> The conventional upper formwork described above has the following problems.

(a) With conventional upper forms, it is difficult to maintain the regular shape of the upper form.

That is, since the corners of the upper formwork are bendable, the second formwork is likely to deform when the flow pressure of the concrete acts as a distortion force on the upper formwork.

Therefore, the cross-sectional shape of the legal frame is deformed.

<Opening> It is also possible to restrain the deformation of the upper formwork by applying reaction members, bars, etc. in multiple layers to the upper formwork.

However, in view of the labor and time required for attaching and detaching these reaction force members, restraints, etc., these restraint methods are not very practical.

Therefore, it is currently desired to propose a technique for maintaining the shape of the upper formwork, which can solve these problems.

<Objective of the present invention> The present invention has been made in view of the above points, and therefore provides an upper formwork for legal frameworks which has a simple structure and can restrain the deformation of the upper formwork, and which is easy to attach and detach. The purpose is to provide a shape holding device.

<Configuration of the Present Invention> Hereinafter, an embodiment of the apparatus for holding the upper form for a legal frame in a fixed shape according to the present invention will be described.

<A> Shape Holding Device As shown in Fig. 1.2, the shape holding device 1 consists of a square bar 11 made of L-shaped steel material, etc. of 2-shaped, T-shaped, or flat shape, and a straight short bar. 12, square timber 11 and short timber 12
The base end of the cross bar 32 is inserted into and locked on the slope,
It has a structure in which deformation of the upper formwork 2 is restrained by inserting a bolt protruding from the free end of the short material 12 into the free end of the square material 1 and tightening it with a nut.

<Opening> The square timber 11 is a jig that directly presses the top and one side of the three molding surfaces of the upper formwork 2, and a locking hole 1111 is provided at the base end of the side that holds the side. It has a bolt hole 11b at the free end of the other side that holds down the top.

Also, on the inside of the side that holds the top, there is a rectangular bar 13.13 near the eccentric part bent at right angles and the bolt hole 11b.
is fixed.

The square timbers 13.13 are the side molding surfaces 21 of the upper formwork 2, which will be described later.
．． Any shape is sufficient as long as it can fill in the step formed at the boundary of the top molding surface 23, and the installation interval of the square members 13 and 13 is determined by the distance between the steps of the concrete formwork 2.

In addition, if there is no step at the corner of the upper formwork 2, the square material 1
3. Use the square timber 11 with 13 omitted.

<C> Short material The short material 12 is a jig that directly presses the remaining side of the three molding surfaces of the formwork, has a locking hole 12a on its base end side, and has a locking hole 12a on its free end side. It has Porto 12b.

<Function> Next, the construction method of the legal frame will be explained with reference to FIGS. 2 to 4.

<A> Installation location r of the lower formwork, two parallel bars 31.31 such as steel bars are placed in parallel,
A transverse bar 32 is fixed between the parallel bars 31 and 31 to form a ladder-like ladder frame 3, and a flexible sheath h 4 for forming the lower part of the legal frame is attached to the lower part of the ladder frame 3, and a lower mold is attached. Manufacture the frame.

Both ends of each crossbar 32.32 are bent downward to lock and prevent the shape-holding device 1 from falling off.

The flexible sheet 4 is formed by providing a net shape or a group of openings that penetrate the concrete 8 in the center thereof, and both sides of the net shape or the group of openings are formed of a material that does not penetrate the concrete 8. .

When assembling the lower formwork, the flexible sheet 4 is attached to the ladder frame 3
Install the parallel bars 31. Wider than the spacing of the parallel bars 31, with some allowance.

Then, the lower formwork is laid on the uneven slope.

<Opening> To install the reinforcing bar cage, the reinforcing bar basket 5 is placed and fixed on the ladder frame 3, and then the lower formwork and the reinforcing bar cage 5 are fixed to anchors 6 driven into the slope.

<C> Installation of the upper formwork Next, from above the reinforcing bar basket 5 and the lower formwork, the simple upper formwork 2
cover.

The upper formwork 2 has a side forming surface 21.2 that forms the side surface of the legal frame.
27. It has a top molding surface 23 for molding the top surface of the legal frame,
The boundary portions of these molding surfaces 21 to 23 are foldably connected.

The material of the upper formwork 2 may be a rigid material such as iron, aluminum, resin, or wood, or a flexible material such as woven fabric, nonwoven fabric, or resin sheet.

<2> Installation of the shape holding device Insert each locking hole 11a, 12a of the square material 11 and the short material 12 into each end of the cross bar 32 protruding from the side of the upper formwork 2,
Next, attach the bolt 12b protruding from the free end of the short piece 12 to the square piece 1.
The upper formwork 2 can be restrained by a simple operation of inserting it into the bolt hole 11b at the free end of the upper formwork 1 and tightening it with a nut.

At this time, the square timbers 13 and 13 are accommodated in the step portions that occur outside the bent portion of the upper formwork 2, and these steps are substantially eliminated.

<E> Placing concrete (Fig. 4) Concrete 8 is poured into the formwork formed into a cylindrical shape by the upper formwork 2 and the lower formwork.

Although the flow pressure of the concrete 8 acts in a direction to cause the upper formwork 2 to protrude, it is supported by the shape holding device 1 and the protrusion of the upper formwork 2 is restrained.

In particular, the square timbers 13, 13 accommodated at the stepped portions of the upper formwork 2 restrain the movement of the upper part of the upper formwork 2 and maintain the regular shape of the formwork 2.

On the other hand, the entire flexible sheet 4 deforms following the unevenness of the ground.

Particularly, in locations where a gap exists between the upper formwork 2 and the ground, both sides of the flexible sheet 4 close the gap to prevent leakage of the concrete 8.

Further, in the central part of the flexible sheet 4, the concrete 8 passes through and comes into direct contact with other piles.

<F> Remove the mold After the prescribed curing period has passed, remove the screws between the square timbers 11 and short timbers 12, pull out the square timbers 11 and short timbers 12 from the cross bar 32, and remove the shape holding device 1 from the upper formwork 2. do.

Finally, the upper formwork 2 is removed to complete the construction of the legal frame.

In addition to the structure described above, a known lower formwork can be used as the lower formwork.

<C> It can be applied to various existing formworks and has great versatility.

(2) The structure is suitable for mass production.

<Other Examples> As shown in FIG. 5, as another structure for hooking the base end of the shape holding device 1, grooves 33 are provided in the lower surface of both ends of an M-shaped cross bar 32, and this By fitting the respective rest holes 11a and 12a of the square timber 11 and the short timber 12 into the groove 33, the same effects as in the previous embodiment can be obtained.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<A> The shape holding device made of angle material or the like can be easily attached and detached.

<Mouth> Concrete 1.
Deformation of the upper formwork can be reliably prevented even if the flow pressure of

[Brief explanation of the drawing]

Fig. 1.2 A perspective view of the shape holding device according to the present invention. Fig. 2. A perspective view of the entire formwork for the legal framework. Fig. 3; An explanatory diagram of the construction method for constructing the legal framework. Figure 4: Cross-sectional view of the formwork when completed; Figure 5: Cross-sectional view of the formwork when concrete is poured into the formwork; Explanatory drawings of other embodiments. Applicant: Free Kogyo Co., Ltd.

Claims (1)

[Claims] (1) A device for holding the outer periphery of an upper formwork for a legal framework having a semi-cylindrical cross section, consisting of an L-shaped hook material and a straight short material, each base of the hook material and the short material. It has a locking hole at one end that can be locked to a rod laid on the slope, a bolt is provided at the free end of the short piece, a bolt hole is provided at the other end of the hook, and the side with the bolt hole has a bolt hole at the other end. A shape holding device for an upper form for a legal framework, which is provided with a square member on the inner surface that corresponds to the step shape formed on the outer periphery of the corner of the upper form.