JPH054219A - Method and apparatus for manufacturing hollow concrete molding member - Google Patents

Abstract

PURPOSE:To simply and certainly perform filling work in a rear surface part hard to perform the filling with concrete in the manufacture of a hollow concrete molding member. CONSTITUTION:A cylindrical retaining mold 2 is arranged inside an outer retaining mold 1 having an L-shaped cross section so as to provide a definite gap between both molds and the gap part 8 formed into an L-shape is filled with concrete only in its longitudinal direction. Next, the concrete filled part is covered with a plate-shaped reinforcing outer retaining mold 3 to fix the mold 3 to the outer retaining mold 1. Thereafter, the whole of the retaining molds is rotated by 90 deg. around the bent part 12 of the L-shaped outer retaining mold 1 and the side surface part and upper surface part of the gap part are filled with concrete after rotation and the previously filled concrete 10a is unified with the later filled concrete 10b to manufacture a hollow concrete molding member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hollow concrete molded member and a manufacturing apparatus therefor, which is used in a structure such as a reinforced concrete structure or a reinforced steel frame concrete structure to form a column by filling the inside with concrete.

[0002]

2. Description of the Related Art In recent years, at construction sites, large amounts of temporary materials such as formwork and supporting work, concentrated deployment of labor workers, safety during formwork assembly and disassembly, ensuring a certain quality for a large amount of body parts, etc. Due to various problems in workability, it is an urgent task to develop a safe and labor-saving construction method for on-site work.

As one of the methods for solving these various problems, a hollow concrete molding member that also serves as a formwork is produced in a factory, and the main reinforcement is fitted on site and concrete is placed therein. Therefore, there is a synthetic method for building columns, beams, or girders of buildings.

As a method of manufacturing a hollow concrete molded member used in such a construction method, a method of manufacturing a concrete member having a U-shaped cross section and joining two of them facing each other to form a cylindrical member, In order to manufacture a member having a cylindrical shape from the beginning, a cylindrical outer mold and a slightly smaller inner mold arranged inside the cylinder are prepared in the vertical direction, and the outer mold and the inner mold are A method of pouring concrete between them, or an outer formwork having a U-shaped cross section and a cylindrical inner formwork to be placed inside thereof are prepared in the lateral direction, and a vibrator or the like is installed on the outer formwork to operate. There is a method in which concrete is filled between the outer mold and the inner mold while being allowed to do so.

[0005]

However, the method of joining two concrete members having a U-shaped cross-section facing each other has a drawback in that it is troublesome to join the completed members to each other. It is also difficult to insert a hoop muscle or the like which is a shear reinforcement muscle.

A tubular outer mold and an inner mold are vertically prepared,
In the method of filling the concrete in the meantime, eliminating the joints and allowing the insertion of shear reinforcements such as hoops, there is a length in the longitudinal direction, so the concrete filling work becomes complicated and the filled concrete does not breathe. There is a concern that the strength of the entire member will be uneven.

Furthermore, in the method of preparing an outer formwork having a U-shaped cross section in the lateral direction, arranging an inner formwork having a cylindrical body inside thereof, and filling concrete while operating a vibrator, the weight of the concrete itself is reduced. Although it is easier to fill than the filling by the method, it is still difficult to fill the space in the lower surface of the formwork with concrete, and it has not been possible to confirm whether or not the filling is complete.

The present invention is intended to address such a problem, and has achieved its object by completing the invention described below.

[0009]

According to the present invention, a horizontally long outer mold having an L-shaped cross section and a cylindrical inner mold arranged inside thereof are provided with a constant gap between the outer mold and the inner mold. And is fixed via a side mold so as to close the formed gap portion of the side part, and the whole mold is rotatable about the bent part of the outer mold. The step of filling concrete only in the longitudinal gap among the L-shaped gaps formed, and the same shape as one side of the outer formwork after filling are performed. A step of covering and fixing the surface of the concrete-filled portion with a plate-shaped auxiliary outer mold so that the outer mold becomes U-shaped as a whole, and thereafter, the entire mold is L-shaped. Rotate 90 degrees around the bent part as the axis, the concrete filling part becomes the bottom part, and the outer formwork becomes U-shaped as a whole. In the continuous process before the concrete filled after the rotation and the step of rotating, the remaining gaps are filled with concrete in the longitudinal gaps and the upper face gaps, and the previously filled concrete and the It is intended to manufacture a hollow concrete molded member by a process of integrating filled concrete.

At this time, a shear reinforcing material such as a hoop muscle may be fitted to the inner mold in advance at a required interval.

[0011]

[Function] The entire formwork is 9 times in the concrete filling process.
By rotating 0 °, the concrete can be completely filled in the straight direction, and the concrete can be completely filled without any voids in the concrete filling on the lower surface where it is difficult to fill the concrete. It is possible to easily and completely fill the upper surface and the upper surface in the conventional direction.

[0012]

EXAMPLES The manufacturing method of the present invention is carried out by using the manufacturing apparatus (A) shown in FIG. This apparatus comprises a laterally long outer formwork (1) having an L-shaped cross section, and a cylindrical inner formwork (2) arranged with a constant clearance (8) inside thereof.
A side mold (4) for fixing the outer mold (1) and the inner mold (2) and closing a gap in the side, and the same shape as one side of the outer mold (1) The external formwork (3) in the form of a plate, which is L-shaped,
Is rotatable about the rotary hinge portion (5) of the bent portion (12).

The rotating means is an L-shaped end portion of the outer mold, and a ring-shaped locking piece (9) is provided at an arbitrary position in the longitudinal direction,
The hook (9), not shown, is hooked on the locking piece (9), but it may be carried out manually or by using a driving means such as a motor, which is not particularly limited. The locking piece (9) is also provided at the other end of the L-shaped outer mold.

The side formwork (4) may be formed integrally with the outer formwork (1) or the inner formwork (2), but it is removable in consideration of demolding work after hardening of concrete. Better Further, the side formwork (4) may have a hollow shape having the same size as the outer circumference of the inner formwork (2) and may have a ring shape having the same width as the gap part, and the outer formwork (1) Also, the inner formwork (2) may be planar so as to cover the entire side surface of the inner formwork (2).

The inner formwork (2) may be composed of several plate-like members so as to be easily removed in consideration of the demolding work after hardening of concrete, but it is integrally molded by a flexible member such as rubber. It is also possible to use a hollow cylindrical formwork in which the hollow part is filled with compressed air to retain its shape.

In this case, the combination of the plate-shaped members for the inner formwork is, as shown in FIG. 3, two members (2
b, 2c or 2e, 2f) are connected vertically and fixed with pins so that the members do not shift to form both side surfaces, and then the upper surface (2d) and the lower surface (2a) are combined to form The inner mold form (2) is formed without breaking down.

Further, a large number of protrusions (7) are formed on the outer peripheral surface of the inner mold (2). This protrusion (7) has a large number of recesses (11) on the inner surface of the hollow concrete member after molding.
The purpose of this is to improve the bite with the post-cast concrete in the hollow and to secure the integrity.

In the apparatus having the above-mentioned structure, first, side molds (4) are attached to both longitudinal ends of the outer mold (1),
Next, a plurality of shear reinforcements (6 ... 6) such as hoop reinforcements are arranged at predetermined intervals, and then a plate-shaped inner formwork (2) is assembled in the hollow of the shear reinforcement reinforcements (6 ... 6). , Outer formwork (1)
And the side formwork (4). At this point, the stiffening outer formwork (3) has been removed from the device.

As shown in FIG. 2, the assembled device has an L-shaped gap (8) of about 5 cm between the outer mold (1) and the inner mold (2). Concrete (10) is filled only in the gaps in the vertical direction. The concrete is filled smoothly without any gap due to its own weight.

After the vertical filling is completed, the reinforcing outer form (3) is covered and fixed so as to cover the upper surface so that the outer form has a U-shaped cross section as a whole.

Then, the entire formwork is placed so that the portion filled with concrete (10) is the lower surface, and the rotary hinge part (5) of the bent part (12) of the L-shaped outer formwork (1) is attached. Rotate the shaft by 90 ° so that the outer formwork has a U-shaped cross section as a whole.

Then, the previously filled concrete (10
In a continuous operation before the hardening of a), the side surfaces and the upper surface, which are the remaining gaps, are filled with concrete (10b) and integrated so that the whole concrete becomes a tubular shape.

After the concrete thus filled is hardened, the reinforcing outer formwork (3), the side formwork (4) and the inner formwork (2) are removed and removed from the outer formwork (1). Used as a hollow concrete member (B).

The inner formwork (2) can be removed by reversing the order of assembling. Of the 6 plate members, the upper and lower surfaces (2a) and (2d) are removed. Then
Easy to remove (2b) and (2f) along the diagonal joint surface of the side where the two members are joined, and finally (2c)
And (2e) are removed.

[0025]

[Effects] As described above, according to the present invention, the concrete filling work process in the production of the hollow concrete member is performed in two major steps, so that it is difficult to fill the concrete with the lower surface portion. The filling can be performed in the vertical direction, which is easy to fill, so that the concrete can be filled smoothly and completely without gaps.

Further, unlike the conventional filling method, there is no possibility that a void is formed in the lower surface portion, so that it is possible to always provide a product of stable quality.

[Brief description of drawings]

FIG. 1 is a perspective view of a manufacturing apparatus used to carry out a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view of a manufacturing apparatus showing the procedure of the manufacturing method of the present invention.

FIG. 3 is a perspective view of completion of filling of concrete by the manufacturing method of the present invention.

FIG. 4 is a perspective view showing a hollow concrete member which is a finished product.

[Explanation of symbols]

A: Hollow concrete molding member manufacturing equipment B: Hollow concrete member 1 ... Outer formwork 2 ... Inner formwork 3 ... Auxiliary outer formwork 4 ... Side formwork 5 ... Rotating hinge 6 ... Shear reinforcement 7 ... Protrusion 8: Gap 9 ... Locking piece 10 ... Concrete 11 ... Recess 12 ... Bending section

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B28B 21/88 9040-4G

Claims (2)

[Claims] 1. A laterally long outer mold having an L-shaped cross section and a cylindrical inner mold arranged inside thereof are provided such that the outer mold and the inner mold have a constant gap, and A step of fixing via a side formwork so as to close the formed gap portion of the side portion, and filling concrete only in the longitudinal gap of the L-shaped gap portion; The process of covering and fixing the concrete filling part surface with a plate-shaped auxiliary outer mold having the same shape as one side of the frame, and then using the bent part of the L-shaped outer mold as the axis Hollow characterized by comprising a step of rotating 90 °, and a step of filling the vertical gap and the upper face gap, which are the remaining gaps after rotation, with concrete and integrating it with the previously filled concrete. Method for manufacturing concrete molded member. 2. A laterally long outer mold having an L-shaped cross section, a cylindrical inner mold arranged inside the outer mold, and the outer mold and the inner mold held with a constant gap. And a plate-shaped auxiliary outer formwork for forming a formwork having a U-shaped cross-section integrally with the outer formwork for closing the gap between the side parts, The hollow concrete molded member manufacturing apparatus for carrying out the manufacturing method according to claim 1, wherein the apparatus is rotatable around a bent portion of the outer mold.