JPH03262601A - Manufacture of building member - Google Patents

Abstract

PURPOSE:To obtain easily a building member having a beautiful and arbitrary sectional form from a design point of view, by a method wherein a tubular and baggy inner concrete shuttering having plasticity and a strong outer concrete shuttering which is on the outside of the inner concrete shuttering and has an arbitrary sectional form are arranged, reinforcement iron rods are placed, an intimate mixture of a hydraulic inorganic material is cast, filled up and solidified within the inner concrete shuttering. CONSTITUTION:A cement intimate mixture 6 obtained by mixing a mesh material or a fiber mat or a short fiber into ordinary cement or cellular concrete cement as a reinforcement material is cast within an inner concrete shuttering 1 by a pump. Air in the inner concrete shuttering 1 is set free through an air vent screw hole of a closed member and sealed with a sealing bolt. Then when the cement intimate mixture 6 is filled into the whole of the inner concrete shuttering further, an external form of the inner concrete shuttering 1 is molded after an inside form of an outer concrete shuttering 2. After curing of the cement intimate mixture 6, when the outer concrete shuttering 2 and the inner concrete shuttering are removed, a building member in a desired sectional form is obtained.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a method for manufacturing construction members.

b. Conventional technology As a manufacturing method for construction parts, casting molding has traditionally been the most common method. The main method for this pour formability was to form a mold made of plywood, aluminum, or steel, assemble reinforcing bars inside it, and then pour concrete.

In addition, piles and humid pipes are constructed using the centrifugal acid molding method, in which reinforcing bars are inserted into a rotating cylindrical formwork, concrete is poured in, and the concrete is compacted by centrifugal force.

Furthermore, vibratory casting, in which concrete is compacted by dropping it from a certain height, is an effective method for producing concrete with a low water-cement ratio.

Problems to be Solved by the C8 Invention However, in the current construction field, there is a serious shortage of formwork carpenters.

Additionally, as intelligent buildings become more popular, pillars, beam members, etc. are required to have excellent design.

For this reason, pillars are required to be circular, polygonal pillars with beautiful curves at the corners, triangular, etc., and beams are required to be semicircular, cylindrical, or embossed on their surfaces. Complicating these shapes not only significantly increases the cost of the formwork, but also poses the problem of generating bubbles, abrasions, junkers, etc. on the concrete surface.

On the other hand, there is a cylindrical mold made of paper called a paper tube.
It is lightweight and can create cylindrical cross sections that are impossible with plywood. However, since it is disposable, it is difficult to dispose of leftover materials.

The present invention has been made in view of these points, and its purpose is to solve the above-mentioned problems and to propose a method for manufacturing construction members that can be easily manufactured even if the cross-sectional shape is arbitrary.

d. Means for solving the problem The configuration of the present invention for achieving the above object is (a)
(b) placing a flexible inner formwork in the form of a tube or bag and a strong outer formwork, for example made of metal, having an arbitrary cross-sectional shape in the outer form; (b) inside the inner formwork; Along its length,
Place one or more reinforcing bars as necessary, (c)
One end of the inner form is closed, and a mixture of a hydraulic inorganic material, such as a cement mixture, is injected and filled into the inner form from the other end, and water is removed by air curing, autoclaving, etc. The present invention is characterized in that it is a method for manufacturing construction members that undergoes hardening.

Further, the inner frame is made of a water-permeable material, and the outer frame is provided with a large number of through holes.

e. Function: Since the present invention is configured as described above, the cured cement body can be made into any shape by changing the cross-sectional shape of the metal outer form provided on the wound. Furthermore, it does not require a mold release agent or mold cleaning, and has high demolding efficiency.

In addition, by using a water-permeable material for the flexible inner formwork and providing many through holes in the outer formwork, we have improved the internal pressure and filter effect when cement mixture is injected and filled. Excess water in the cement mixture is removed by.

As described above, the present inventors considered a tube or bag that can easily change into any shape as a driving formwork as an inner formwork, and came up with the idea of arranging a strong outer formwork etc. on the outside. It is something. Furthermore, what is important is that by changing the cross section and surface shape of the outer formwork, free shapes and patterns can be created. We focused on the method of making bamboo for use. Bamboo tries to grow with great force toward its outer periphery in order to get bigger, but in advance, an outer formwork with a square or triangular cross section is placed on the outside of the bamboo, and it is covered when the bamboo shoots are still growing. As it grows, it takes on a shape that follows the outer form, and grows by seeking light from above.In other words, tubes and bags are used instead of bamboo, the growth force is used as internal pressure, and the outer form is made of a strong iron mold. It is supported by a frame or the like. In addition, we created an embossed design using urethane resin on the inner surface of the iron formwork to create a pattern on the surface.

f. Examples Hereinafter, preferred embodiments of the present invention will be described in detail by way of example based on the drawings.

FIG. 1 is a cutaway perspective view showing an embodiment of the construction member manufacturing method of the present invention.

In the figure, 1 is a tube-shaped or bag-shaped inner mold made of a flexible material, and its inner surface is lined with synthetic resin or base rubber to stop water. 2 is an outer formwork arranged to surround the inner formwork 1;
It is made of a mechanically strong material, such as a metal material such as steel or aluminum, or a synthetic resin material such as FRP. The outer formwork 2 has a rectangular cross-sectional shape, and the frame 2 is divided into two parts around a hinge or pin 3. When in use, the formworks 2a and 2b are separated by bolts. 4 etc.

Then, along the length direction in the inner formwork 1,
A plurality of reinforcement reinforcing bars 55, four in this embodiment, are supported and arranged almost equally in cross section by a support member (not shown).
A sealing member having an air vent hole (not shown) is attached to one end of the inner formwork 1, and a cement mixture 6 (described later) is delivered from the other end at an appropriate pressure by a pump (not shown). 6 is injected and filled into the inner mold 1.

The cement mixture 6 is a mixture of ordinary cement, aerated concrete cement, etc., with mesh material, fiber mat, short fibers, etc. as a reinforcing material. When the cement mixture 6 is injected into the inner form 1 by the pump, the air in the inner form 1 is released through the air vent hole of the sealing member, and when the air is released, the seal is sealed. Seal with bolts. Then, by the pump,
When the cement mixture 6 is further filled into the entire inner form 1 at a pressure of 5~] Okg/cj, the outer shape of the inner form 1 follows the inner shape of the outer form 2. At this time, by applying prestress, the cross section can be made finer.

In this way, after the cement mixture 6 has hardened, by removing the outer formwork 2 and the inner formwork 1, a construction member having a desired rectangular cross-sectional shape can be obtained.

The cross-sectional shape of the outer formwork 2 is not only rectangular but also triangular 9.
Any shape can be used, such as a circle. 2 and 3 are other examples showing the cross-sectional shape of the outer nuclear formwork 2. FIG. 2 shows the triangular outer formwork 12, and the arrows in the figure indicate the formwork 12a,
Fig. 3 shows a rectangular outer formwork 22, which has a member 23 with an embossed pattern on its inner surface, and the outer surface of the construction member manufactured thereby. The arrows in the figure indicate the formwork 22a,
22b is shown.

As an experimental example of this embodiment, a steel outer formwork with an inner diameter slightly larger than 65 mm is placed outside a tubular inner formwork with an outer diameter of 65 mm. Next, one end of the inner form was closed, concrete was press-fitted into the frame from the other end, and the concrete was hardened to obtain a strong cylinder.

FIG. 4 is a cutaway perspective view showing another embodiment of the present invention. In FIG. Excess water in the cement mixture 36 is actively allowed to permeate without lining with synthetic rubber or the like. On the other hand, the outer formwork 32 has a circular cross-sectional shape, and is provided with a large number of small diameter through holes 37°37. Therefore, by draining excess water from the cement mixture 36 through the inner formwork 31 and the outer formwork 32, it is possible to obtain a concrete construction member with a high density of wI. In addition, 33 is a hinge part or a pin, and 34 is a formwork divided into two parts 32a and 32b.
Bolts 35 are reinforcing reinforcing bars for connecting the parts.

It should be noted that the technology of the present invention is not limited to the technology in the embodiments described above, and means of other embodiments that perform the same function may be used, and the technology of the present invention can be modified in various ways within the scope of the configuration described above. It is possible to add.

g. Effects of the Invention As is clear from the above explanation, according to the method for manufacturing construction members of the present invention, a flexible tube-shaped or bag-shaped inner formwork and an arbitrary cross-section are formed on the outside thereof. A strong outer formwork having a shape is arranged, reinforcing bars are arranged as necessary in the inner formwork, and a mixture made of a hydraulic inorganic material is injected, filled, and solidified. Therefore, even construction members having an arbitrary cross-sectional shape that is elegant in design can be easily manufactured.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view showing one embodiment of the method for manufacturing construction members of the present invention, FIGS. 2 and 3 are sectional views showing other examples of the outer formwork, and FIG. FIG. 7 is a cutaway perspective view showing another embodiment of the present invention. 1.31...Inner formwork, 2, 12.22.32
...Outer formwork, 5.35...Reinforcement reinforcing bars, 6,36.
...Cement mixture, 37...Through hole.

Claims (1)

[Scope of Claims] 1) (a) A flexible tube-shaped or bag-shaped inner formwork and a strong outer formwork having an arbitrary cross-sectional shape are arranged outside thereof, and (b) the above-mentioned (c) Close one end of the inner formwork and insert it into the inner formwork from the other end, as necessary, along the length of the inner formwork. A method for manufacturing construction members, which comprises injecting, filling, and solidifying a mixture made of a hydraulic inorganic material. 2) The method of manufacturing a construction member according to claim 1, wherein the inner form is made of a water-permeable material, and the outer form is provided with a large number of through holes.