JPH0464666A - Molding form unit for hollow concrete member and molding method - Google Patents

Abstract

PURPOSE:To make operation easy by installing a form unit provided with a solid member-make outer form, a baggy fluid mat type inner form being inflated by injection of a fluid, and a guide regulating a form or the like of the inner form in relation to the outer form, respectively. CONSTITUTION:Each hole 11 of a pair of end form end plates 8 is fitted in both ends in the longitudinal direction of a pole reinforcing bar 13 for a reinforced assembly 2, and this assembly 2 is inserted into an outer form body 6, while both these end plates 8 are locked to the outer from body 6. Next, a fluid mat type inner form 3 is inserted into the reinforced assembly 2 from a hole 10 of the end plate 8 on one side, and a valve 17a is connected to an air compressor, injecting air. With this air injection, the inner form 3 is inflated and thereby it comes into contact with each of reinforcing bars 13, 14, then concrete is placed in space between the outer form 1 and the inner form 3, forming a hollow concrete member. With this constitution, a job for mounting and dismounting can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a formwork apparatus and a method for forming hollow concrete members.

(Prior Art) In this type of conventional formwork apparatus, an inner formwork made of a solid material is fixed within an outer formwork made of a solid material.

For example, an assembly of plate members is fixed as an inner formwork within an outer formwork, or a pipe or the like is fixed therein.

However, since the inner formwork is made of solid materials, transportation, storage,
Handling during molding, attachment to the outer formwork, and removal after molding are time-consuming.

(Object of the invention) The object of the present invention is to improve handling during transportation, storage, and molding.
The object is to allow easy attachment to the outer formwork and removal after molding.

(Technical Means for Achieving the Object) In order to achieve the above object, the present invention includes an outer mold made of a solid member and a bag-like shape into which a fluid can be freely injected and which expands to a substantially predetermined size and shape when the fluid is injected. A molding formwork device is constituted by a fluid mat type inner formwork and a guide that regulates the shape and position of the inner formwork in a swollen state with respect to the outer formwork, and the formwork device is used, Forming hollow concrete members.

(Function) The inner frame is inserted into the outer frame in a deflated state, for example, is inflated by fluid injection, and is set in a predetermined shape and position by a guide. Concrete is poured between the outer formwork and the inner formwork to form a hollow concrete member.

After forming, the inner mold is deflated and removed from the outer mold.

(Example) Fig. 1 is an exploded perspective view of a formwork device for forming a hollow concrete member to which the invention according to claim 1 of the present application is applied, and for example, a formwork for forming a hollow concrete member for a building pivot construction column. It is a device. In this FIG. 1, the outer formwork 1 is
It is composed of a long horizontally placed main body 6 formed of a wooden board or the like and having an open U-shape in cross section, and edge frame end plates 8 fixed to both lengthwise ends of the main body 6. A reinforcing plate 9 is integrally fixed to the surface of the end plate 8 on the main body side, and an inner formwork insertion hole 10 and a reinforcing bar insertion hole 11 are formed. The reinforcing plate 9 has a shape that is fitted into the inner periphery of the end face of the main body 6, and the inner formwork insertion hole 10 corresponds to a predetermined cross-sectional shape (for example, a rectangular shape) when the inner formwork 3 is expanded. It is shaped like this.

2 is a reinforcing bar assembly, which is used as a guide in this embodiment. The reinforcing bar assembly 2 includes, for example, a plurality of column reinforcing bars 13 arranged in a rectangular shape and a plurality of hoop reinforcing bars 1 that bind these together.
It consists of 4.

The inner formwork 3 is made of a bag-shaped rubber mat.

That is, one longitudinal end of the body section 20 formed in an elongated cylindrical shape is closed, and a fluid inlet 16 is formed at the other end, and an injection hose 17 having an on-off valve 17a is connected to the inlet 16. It is connected. The rubber member used in the fluid mat type inner form 3 is formed thickly and has a large tensile elastic modulus, so that after it swells to a predetermined size as shown in Figure 1, it hardly swells any further. ing.

The fluid mat type inner formwork 3 of this embodiment is made by folding a single rubber member in half and joining them together along the section A, as shown in FIG. It is manufactured by closing it and providing an injection port 16 at the other end.

In FIG. 4 showing the overall side view after assembly, the length of the fluid mat type inner formwork 3 is longer than the length of the outer formwork l, similar to the column reinforcing bars 13 of the reinforcing bar assembly 2. When set in the frame 1, both ends protrude by a certain amount.

An example of a concrete member forming method using the formwork apparatus will be explained. The longitudinal ends of the column reinforcing bars 13 of the reinforcing bar assembly 2 shown in FIG. At the same time, both end plates 8 are fixed to both ends of the outer form body 6.

Next, the deflated inner form 3 is inserted into the reinforcing bar assembly 2 through the hole 10 of one end plate 8, the valve 17a is connected to a near compressor, etc., and air is injected. Then, the inner formwork 3 starts to swell from the state shown in Fig. 5, swells by a certain amount as shown in Fig. 6, and comes into contact with each reinforcing bar 13, 14 of the reinforcing bar assembly 2, which positions it and at the same time changes its cross-sectional shape. It is restricted to a rectangular shape of a predetermined size.

In the state shown in Figure 6, concrete is poured from above and hardened to form a hollow concrete member.

After forming, air is removed from the fluid mat type inner formwork 3 to deflate it, and the reinforcing bar assembly 2 is pulled out.

In the above method, the reinforcing bar assembly 2 was fixed in the outer form l at the same time as the end plate 8, and then the fluid mat type inner form 3 was inserted. Frame 3
may be inserted and inflated to a predetermined shape, and at the same time, the end plates 8 are attached to the reinforcing bar assembly 2, and then they are set in the outer form body 6 at the same time.

(Another embodiment) (1) FIG. 7 shows a modification of the inner formwork 3, in which, for example, eight band-shaped rubber members are joined along each seam A to form the body part 20, Rubber end caps 21 formed in a rectangular shape are connected to both longitudinal ends of the body portion 20. With this structure, the cross section tends to be rectangular when the inner formwork 3 is inflated.

(2) In FIG. 8, a small uneven surface (rough surface) is formed on the surface of the fluid mat type inner mold 3. According to this, the inner peripheral surface of the concrete member after forming becomes rough;
When new concrete is poured into a hollow part of a concrete member to fill it, the bond between the concrete members is strengthened.

(3) In FIG. 9, relatively large stepped interlocking protrusions 27 are formed on the surface of the inner mold 3. According to this, a large interlocking recess is formed on the inner peripheral surface of the concrete member after forming, and when new concrete is poured into the hollow part of the concrete member to fill it, the mechanical bond between the concrete members is strengthened.

Furthermore, since the protrusion 27 is formed at a position corresponding to the reinforcing bar 13 so that the protrusion 27 hits the reinforcing bar 13 when inflated, a sufficient concrete wall thickness around the reinforcing bar 13 can be ensured.

(4) 1C1 and FIG. 11 are structures that do not use reinforcing bar assemblies as guides, but instead use four metal fittings 40 that are longer than the outer formwork 1 and four plywood plates 41. Therefore, the concrete member formed by the formwork apparatus is not concerned with the presence or absence of reinforcing bars.

As shown in Fig. 10, both longitudinal parts of the L carving tool 40 are
A plywood plate 41 is placed between each of the L carving fittings 40, and the inner formwork 3 is inserted therein and inflated.

Note that it is easier to work on the two upper L carving tools 40 and the upper plywood board 41 if they are inserted into the outer form 1 after the inner form 3 has been expanded to some extent.

After the molding is completed, the inner formwork 3 is deflated and pulled out to form L.
The carving tool 40 and the plywood board 41 can also be removed easily.

(5) In the embodiment shown in Fig. 12, the outer formwork 1 has a cylindrical shape with a rectangular cross section surrounded on all sides, and is placed vertically, and concrete is poured from the upper end in the lengthwise direction. It is a formwork device.

This also does not use the reinforcing bar assembly 2 as a guide, but instead provides a spacer guide 32 that extends inward from the reinforcing bar assembly 2. An end plate (8) as shown in FIG. 1 is fixed to the lower end of the outer formwork 1, and the upper end is open. The spacer guides 32 are fixed to each side wall of the outer formwork 1 and the reinforcing bar assembly 2, and the inner end of the spacer guide 32 extends inward from the reinforcing bar assembly 2, and has a rectangular shape formed by an inner end flange 32a. It forms a shape guide surface.

(6) FIG. 13 is an example including a vertically placed outer formwork 1 and a spacer guide 32 similar to that in FIG. 12, but the member for fixing the spacer guide 32 is distinctive. That is, outer formwork 1
A reinforcing vertical pipe 35 and a reinforcing horizontal vibrator 36 are fastened to the outside by a metal fitting 37, and the spacer guide 32 is fixed to the metal fitting 37.

(7) Fig. 14 is also an example with a vertically placed outer formwork 1 similar to Fig. 12, but as shown in Fig. 16, holes 10 of the end plate 8 provided at the lower end are ) 10a is provided, the first
As shown in FIG. 5, a frame-shaped hoop (guide) 46 is provided at the open upper end via radial stays 37.

There is no guide in the middle of the outer formwork 1, but if the length of the outer formwork 1 is not very long, positioning with 46.10a as shown in Fig. 14 and regulating the shape will be sufficient. The predetermined shape of the inner formwork 3 can be maintained.

(8) FIG. 17 shows a formwork device in the case where there are cross reinforcing bars 50, and the inner formwork 3 is inserted into four spaces separated by the cross reinforcing bars 50, respectively.

(9) In addition to the example described above, for example, the predetermined shape in which the inner formwork 3 is swollen can be made into a cylindrical shape, and the formwork apparatus can be used to form a cylindrical concrete member.

(10) Water can also be used as the injection fluid for the fluid mat type inner formwork 3.

(11) Synthetic resin can also be used as the material for the fluid mat type inner formwork 3.

(Effects of the Invention) As explained above, the present invention comprises an outer formwork 1 made of a solid member, and a bag-like fluid mat type inner frame into which fluid can be freely injected and which expands to approximately a predetermined size and shape when the fluid is injected. Formwork 3 and outer formwork 1
The guides (2, 32, 46) that regulate the shape and position of the inner formwork in a swollen state constitute a formwork device for forming hollow concrete members, and the device is used to form concrete. This has the following advantages:

(1) The inner formwork 3 can be transported and stored in a deflated and compact state, and does not take up much space for transportation and storage, and is lightweight and easy to handle.

(2) Since the inner form 3 is inserted in a soldered state and inflated, and the position, size, etc. are regulated by guides, installation into the outer form is easy and requires no effort.

(3) After forming the concrete member, the inner formwork 3 can be deflated and removed, and the removal work after forming does not require much effort.

(4) In addition to the predetermined shape of the inner mold itself, it can be set accurately and easily into a desired shape by the guide, so various hollow shapes can be easily set.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a formwork device for forming hollow concrete members to which the present invention is applied, Fig. 2 is a perspective view of the inner formwork in a deflated state, and Fig. 3 is a sectional view taken along ■-■ of Fig. 2. , Fig. 4 is an overall side view of the formwork device, Fig. 5 is an enlarged cross-sectional view taken along the line V-■ in Fig. 4 with the inner formwork in a deflated state, and Fig. 6 is an enlarged cross-sectional view of Fig. 4 with the inner formwork in a swollen state. FIG. 7 is a perspective view showing a modified example of the inner form; FIGS. 8 and 9 are sectional views showing an example in which projections are provided on the inner form; FIG. The figure is a front view of another modification of the formwork device, FIG. 11 is a vertical cross-sectional view of the same example as in FIG. 10, and FIGS. 12 and 13 are horizontal cross-sectional views showing vertically installed formwork devices , Fig. 14 is a vertical sectional view showing another vertical type formwork device, Fig. 15 is a top view of Fig. 14, Fig. 16 is a bottom view of Fig. 14, and Fig. 17 is a four-part type formwork device. FIG. 2 is a front view of a formwork device having an inner formwork. 1... Outer formwork, 2... Rebar assembly (an example of a guide), 3... Fluid mat type inner formwork, 32... Spacer guide, 40.
41...L-shaped metal fitting, plywood board (an example of a guide), 10
a, 46...Haga (an example of a guide) Patent applicant Ohsue Construction Co., Ltd.

Claims (2)

[Claims] (1) An outer formwork made of solid materials, a bag-like fluid mat type inner formwork into which fluid can be freely injected and which expands to approximately a predetermined size and shape when the fluid is injected; A formwork device for forming hollow concrete members, comprising a guide for regulating the shape and position of an inner formwork in an open state. (2) Using a formwork device comprising an outer formwork made of solid materials, an inner formwork of a bag-like fluid mat type, and a guide according to claim 1, concrete is poured between the outer formwork and the inner formwork and hardened. Method of forming hollow concrete members.