JPH0929726A - Form for molding pc product and production of pc product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To demold a PC product along the molding surface of a form while forming an uneven part to the surface of the PC product and simplify the demolding work at this time while preventing the damage of the PC product at the time of demolding. SOLUTION: An uneven member 30 is provided to the housing part formed to each corner part of the molding surface of an inner form 14 so as to be capable of advancing to and retreating from the housing part and a plurality of cam guide brackets 34 are attached to the inner surface 30b of the uneven member 30 at an appropriate interval in an up and down direction and cams 36 are fitted in the engaging holes 34a of the brackets. The cams 36 are fixed so as to be set to the same phase in the rotary direction of a rotary shaft 38. The uneven member 30 is fixed to a protruding state by rotating the rotary shaft 38 and concrete 40 is cast into the space part between the inner form 14 and an outer form 16. After cast concrete 40 is solidified, the uneven member 30 is allowed to retreat toward the housing member 30 by rotating the cams 36 and the inner and outer forms 14, 16 are raised to demold a PC product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables immediate demolding of PC products by filling concrete in the space between the inner and outer molds arranged substantially concentrically and vibrating and compressing it. The present invention relates to a mold for molding a PC product in which a PC product is demolded along a molding surface of the mold and a method for manufacturing a PC product using the mold for molding a PC.

[0002]

2. Description of the Related Art Conventionally, a PC (precast concrete) product, for example, a hollow product such as a concrete pipe or a PC column formwork for construction, has a shape along the inside and outside of the PC product. When inner and outer molds are used and the inner and outer molds are arranged substantially concentrically, concrete is placed in the space between both molds, and after that, when the concrete is solidified or hardened. It is designed to be released from the mold.

In recent years, in order to improve the manufacturing efficiency of the PC product, Japanese Patent Publication No. Hei 1-15361 (B28B1) has been proposed.
As disclosed in No. 08), it is proposed that a molding formwork is filled with 0 slump concrete, and this is pressed on a vibrating table to accelerate the solidification of concrete and enable immediate mold release. ing.

However, since the inner and outer molds are pulled out in the cylinder axis direction of the PC product in performing such immediate mold release, uneven portions are formed on the inner or outer surface of the molded PC product. Could not be formed. For example, when a PC pillar formwork is molded as a PC product, it is not possible to project a concavo-convex portion (shear cotter) inside the PC pillar formwork, and therefore, it is placed in the PC pillar formwork on site. As a result, the bondability with the post-cast concrete is deteriorated, and further, the strength of the concrete column cannot be further increased.

Therefore, a concavo-convex member is provided on the molding surface of the inner mold form so that the concavo-convex member can advance and retreat from this, concrete is filled in the advanced state of the concavo-convex member, and the concavo-convex member is retracted to the inner mold side during demolding. JP-A-6-114815 proposes a mold for molding a PC product that enables immediate demolding while forming an uneven portion inside the PC product, and a method for manufacturing a PC product using the mold for molding a PC. Has been done.

By the way, Japanese Patent Laid-Open No. 6-114815 discloses the following three embodiments as a structure for advancing and retracting the concave and convex member. The concavo-convex member is advanced and retracted via position adjusting bolts provided at the upper and lower ends between the concavo-convex member and the inner mold. A plurality of hydraulic cylinders are arranged in the vertical direction of the concavo-convex member and the inner mold, and the concavo-convex member is moved forward and backward by expanding and contracting the respective hydraulic cylinders. The concavo-convex member itself is configured to be expandable / contractible by a thin sheet having flexibility, concrete is filled in the expanded state, and contracted at the time of demolding.

[0007]

However, the PC proposed in the conventional Japanese Patent Laid-Open No. 6-114815.
In the product forming mold and the method for manufacturing a PC product using the forming mold, when the concave-convex member is moved back and forth by the position adjusting bolt, the concave-convex member is moved by one rotation of the position adjusting bolt. Since the distance is only one pitch of the bolt, it is necessary to rotate many position adjusting bolts in order to move the concavo-convex member back and forth to the target position, and the work of moving the concavo-convex member is complicated. Further, when the concave-convex member is retracted, it is necessary to rotate the position adjusting bolts provided at the upper and lower end portions in synchronization, and this synchronization work is difficult.
When the amount of movement of the uneven member by the upper and lower position adjusting bolts is different, it is conceivable that the uneven member tilts at the time of demolding and twists between itself and the PC product, resulting in damage to the PC product.

Even when the concavo-convex member is moved back and forth by the hydraulic cylinder, when the plurality of hydraulic cylinders arranged in the vertical direction have different expansion and contraction amounts, the concavo-convex member is inclined as in the case described above. Then, the PC product may be damaged.

Further, when the concavo-convex member is configured to be expandable and contractible, there are various problems that it is difficult to obtain a uniform concavo-convex portion over the whole due to a slight change in thickness of the thin sheet.

In view of such conventional problems, the present invention enables the mold release of the PC product along the molding surface of the mold while forming the uneven portion on the surface of the PC product, and at the time of removing the mold. An object of the present invention is to provide a mold for molding a PC product that can simplify the mold work and prevent the PC product from being damaged at the time of demolding, and a method for manufacturing a PC product using the mold for molding a PC. And

[0011]

In order to achieve the above object, the PC product molding mold of the present invention is such that after the inner and outer molds are arranged substantially concentrically, concrete is placed in the space between both molds. In a mold for molding a PC product by filling with, a concave-convex member is provided on the molding surface of the inner mold form so as to be able to move forward and backward, and a cam for driving the concave-convex member forward and backward is provided. Fill the concrete, rotate the rotating shaft of the cam to release from the concrete at the time of demolding,
The concavo-convex member is configured to retract toward the inner mold side.

Further, the method for manufacturing a PC product of the present invention is
In a method of manufacturing a PC product by arranging the inner and outer molds substantially concentrically, and then filling the space between the molds with concrete, the molding surface of the inner mold is provided so as to be able to move forward and backward. A step of holding the concavo-convex member in a state of advancing from the forming surface by a cam and filling the concrete, and rotating the rotating shaft of the cam after the filled concrete is solidified to make the concavo-convex member the inner formwork. Retract to the side, the PC
And a step of demolding the product along the molding surface of the mold.

According to the PC product molding frame of the present invention and the method for manufacturing a PC product using the molding frame of the present invention having the above-mentioned structure, the inner surface of the inner frame is provided with concaves and convexes which can be moved back and forth. By holding the member in the advanced state and pouring and filling the concrete, the concrete is formed into an uneven shape by the uneven member. Then, at the time of demolding, the PC to be demolded by retreating the concavo-convex member toward the inner mold side so as to demold the filled concrete.
The product can be smoothly removed from the mold without being hooked on the uneven member. Therefore, even when the PC product is demolded along the molding surface of the mold, an uneven portion can be formed on the inner surface of the PC product, and the degree of freedom in the shape of the product is significantly improved. Further, since the cam is used to drive the concavo-convex member forward and backward, the concavo-convex member can be smoothly moved forward and backward by the rotation of the rotary shaft of the cam, and when a plurality of cams are attached to the rotary shaft. By rotating the rotary shaft, these cams can be synchronously rotated, and the twisting of the uneven member can be reliably prevented.

By the way, in the present invention, a cam is used to drive the concavo-convex member forward and backward, and the concavo-convex member is retracted toward the inner mold side when the mold is removed by rotating the rotary shaft of the cam. Therefore, the retracting operation of the uneven member can be smoothly performed. Therefore, when the concave-convex member is retracted, it is possible to prevent the concave-convex portion of the PC product formed by the concave-convex member from being broken or damaged.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5 show the P of the present invention.
FIG. 1 is a plan view, FIG. 2 is an enlarged sectional view of an essential part taken along line AA in FIG. 1, and FIG.
2 is a sectional view corresponding to FIG. 2 showing an operating state, FIG. 4 is a perspective view showing an embodiment of a PC product molded by the molding frame of the present invention, and FIG. 5 is a molding process by the PC product molding frame. It is explanatory drawing which shows one Example.

That is, the PC product molding frame (hereinafter referred to as a molding frame) 10 of the present embodiment is for molding a PC frame 12 for a pillar of a building material (see FIG. 4) as a PC product. Therefore, as shown in FIG. 5, an inner mold 14 and an outer mold 16 are provided, and the inner and outer molds 14, 16 are coaxially arranged,
In the space 18 formed between them, the hopper 2
It is designed to be filled with concrete poured from scratch. Vibration is applied to the outer mold frame 16 by a vibrator 22, and the filled concrete is compacted by the additional vibration. Further, the concrete is compacted by the vibration exciter 22 in this manner, and the pressurizer 24 is moved downward to apply a pressing force to the concrete, whereby the concrete is pressed compactly,
The solidification of concrete is promoted.
When the concrete is solidified, the inner and outer molds 1
The mold 4 and 16 are removed by pulling them upward.

As shown in FIG. 1, the inner and outer molds 14 and 16 have a rectangular cross section, and the main body is made of steel, hard rubber, FRP (fiber reinforced resin) or the like in a rigid shape. It An accommodating portion 32 is formed at each of the outer corners of the inner mold frame 14 that serves as the molding surface 14a, and the accommodating portion 32 is provided with a concavo-convex member 30 that can move outward and backward. The concavo-convex member 30 has a large number of concavo-convex portions 30a integrally and continuously formed in a vertical direction on the side facing the space portion 18, and the concavo-convex portion 30a is advanced and retracted toward the inside of the space portion 18. It

A plurality of cam guide brackets 34 are attached to the inner surface 30b of the concavo-convex member 30 facing the housing portion 32 at appropriate intervals in the vertical direction, and the engagement holes 34a formed in the cam guide bracket 34 are provided in the engaging holes 34a. The cams 36 are fitted with each other. The cams 36 are fixed to the rotating shaft 38 so that their respective phases are set in the same direction in the rotating direction. Incidentally, the cam guide bracket 34 and the cam 36,
The rotary shaft 38 is built in the inner mold form 14.
The upper end of the rotary shaft 38 is provided so as to project from the upper surface of the inner mold form 14, and a head portion 38a having a hexagonal cross section is formed at the projecting portion. Then, a jig is engaged with the head portion 38a to rotate the rotary shaft 3
When the cam 8 is rotated, the cam 36 is rotated integrally with the cam 8, and the cam guide bracket 34 is retracted in the left-right direction in FIGS. It is designed to be moved forward and backward and held.

Although the concave-convex member 30 advances into the space 18, a gap is formed between the concave-convex member 30 and the storage portion 32.
By inserting a liner (not shown) into this gap so that it can be freely inserted and removed, the gap is filled and the concavo-convex member 30 is held in position by resisting the compaction force of the filled concrete, so that the concavo-convex portion can be formed with high dimensional accuracy. it can.

In the molding frame 10 having such a structure, first, the cam 36 is appropriately rotated together with the rotating shaft 38 to fix the concave and convex member 30 in the advanced state shown in FIG. Concrete 40 is poured and filled in the space 18 between the outer formwork 16. Then, when the filled concrete 40 is solidified, the rotating shaft 38 is rotated to reverse the eccentric direction of the cam 36, and the concavo-convex member 30 is retracted into the storage portion 32. In this way, the inner mold frame 14 and the outer mold frame 16 are lifted in a state where the concavo-convex member 30 is retracted, so that the pillar mold PC 12 shown in FIG. 4 is removed.
Is molded.

PC mold 1 for pillars molded in this way
2, the cotter portions 42 as uneven portions can be formed by the uneven member 30 at the four corners of the inner surface. Therefore, the post-cast concrete that is placed inside the PC formwork 12 when the pillar PC formwork 12 is built on site is constructed by the cotter portion 42 having significantly improved binding property. The strength of concrete columns can be significantly improved.

Therefore, in the molding mold 10 of this embodiment, even when the pillar PC mold 12 is demolded along the molding surface 14a of the inner mold 14, the inner mold 14 is not removed. The cotter portion 42 can be formed on the surface of the column PC mold 12 by the concave-convex member 30 that can be moved forward and backward. Further, since the concavo-convex member 30 is configured to retreat toward the storage portion 32 when the mold is released, the concavo-convex portion 30 of the concavo-convex member 30 is provided.
It is possible to smoothly remove the mold without the a catching the cotter portion 42. As described above, in this embodiment, since the concavo-convex shape can be formed on the PC mold 12 for the pillar molded by the molding mold 10, the degree of freedom of shape of the product can be remarkably improved.

In the present embodiment, the molding form 10 for manufacturing the PC form 12 for columns as a PC product has been described as an example, but the present invention is not limited to this, and other PC products can be used.
For example, it goes without saying that the present invention can be applied to a molding frame for manufacturing a hollow pipe such as a concrete pipe having a circular cross section.

[0024]

As described above, according to the PC product molding mold of the present invention and the method of manufacturing a PC product using the molding mold, the molding surface of the inner mold can be moved back and forth. Since the concavo-convex member provided in the above is held in the advanced state and concrete is poured and filled, and at the time of demolding, the concavo-convex member is retracted to the inner mold side so as to be released from the filled concrete. Even though the concave-convex member can form a concave-convex portion on the PC product, the PC product to be released from the mold can be smoothly extracted from the mold without being caught by the concave-convex member. Therefore, when molding a PC product, the degree of freedom in the shape of the product can be significantly improved.

Further, since a cam is used to drive the concavo-convex member forward and backward, and the rotary shaft of the cam is rotated, the concavo-convex member is retracted toward the inner mold side at the time of demolding. The backward movement can be performed smoothly. Further, when a plurality of cams are attached to the rotary shaft, the cams can be synchronously rotated by the rotation of the rotary shaft, and the uneven member can be prevented from being tilted at the time of retracting, In addition, it is possible to prevent various damages such as the breakage of the uneven portion of the PC product formed by the uneven member when the uneven member is retracted.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a PC product molding frame according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part taken along the line AA in FIG.

FIG. 3 is a sectional view corresponding to FIG. 2 showing an operating state.

FIG. 4 is a perspective view showing an embodiment of a PC product molded by the molding frame of the present invention.

FIG. 5 is an explanatory diagram showing an example of a molding process using a PC product molding frame.

[Explanation of symbols]

10 PC product molding frame 12 Column PC
Formwork (PC product) 14 Inner formwork 14a Forming surface 16 Outer formwork 18 Space part 30 Concavo-convex member 30a Concavo-convex part 32 Storage part 36 Cam 38 Rotating shaft 40 Concrete 42 Cotter part (concave part)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Masuda 4-640 Shimo-Seido, Kiyose-shi, Tokyo Inside Obayashi Institute of Technology Co., Ltd. Head office

Claims (2)

[Claims] 1. A mold for molding a PC product by arranging inner and outer molds substantially concentrically, and then filling the space between the molds with concrete to mold a PC product. In addition to providing a concavo-convex member that can move back and forth, a cam that drives the concavo-convex member forward and backward is provided, concrete is filled in the advancing state of the concavo-convex member, and the rotating shaft of the cam is rotated to release from the concrete when demolding. Then, the mold for PC product molding is characterized in that the concave and convex member is retracted toward the inner mold side. 2. A method for producing a PC product by arranging inner and outer molds substantially concentrically, and then filling the space between the molds with concrete to produce a PC product. A step of holding the concavo-convex member provided so as to be able to advance and retract with a cam in a state of advancing from the forming surface, and filling the concrete, and then rotating the rotating shaft of the cam to solidify the concrete, and the concavo-convex member. P to the inner mold side, and after removing the PC product from the mold along the molding surface of the mold, P using a mold for molding.
C product manufacturing method.