JP2013119207A - Precast concrete block manufacturing form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete block manufacturing form capable of manufacturing, even a large concrete block with excellent work efficiency and at low cost by using a paper-made frame member.SOLUTION: The precast concrete block manufacturing form includes a vertical cylindrical periphery form member 11 forming a rising outer circumferential face of a precast concrete block to be manufactured, and a bottom frame member 12 fittedly provided to an inner bottom thereof. The periphery form member 11 is configured with a cylindrically formed paper material, and the bottom frame member 12 is configured with a metal material having a shape of forming an end face of a desired shape of the precast concrete block to be manufactured.

Description

  The present invention relates to a precast concrete block manufacturing form for manufacturing a concrete block such as a pile head block installed at an upper end of a pile that supports an offshore structure, for example.

  In general, the formwork used for the production of precast concrete blocks that make up offshore structures uses steel formwork members with a shape that divides the outer shape of the block to be produced, and assembles the formwork by combining them. It was manufactured by filling the inside with concrete (for example, Patent Document 1).

  Conventionally, a paper material subjected to waterproof treatment is used as a formwork material, and a paper cylindrical material is used as a columnar formwork for a void member or cast-in-place concrete (for example, Patent Document 2). 3, 4).

JP-A-6-31416 Japanese Patent Laid-Open No. 10-219997 JP 2002-180661 A JP 2002-349062 A

  However, among the conventional techniques as described above, the precast concrete block manufacturing formwork using the steel formwork member can be reused many times. For example, the precast concrete block manufacturing formwork is manufactured in a large amount like a wave-dissipating block. Although it is suitable for the block, there is a problem in that the block for the special use that is manufactured only in a small number is disadvantageous in terms of cost because the ratio of the mold manufacturing cost becomes high.

  In addition, the paper mold has an advantage that it can be manufactured at low cost even when it is not used repeatedly. For this reason, it has been used in the past, but it was mainly used as a formwork and void material for cast-in-place concrete for building structures, especially large concrete with a weight of several hundred kilograms to several tons. When manufacturing the block, there is a problem that it is not suitable for forming all the surfaces.

  In view of such a conventional situation, the present invention is a precast concrete block manufacturing formwork that can be manufactured with good workability and low cost using a paper formwork member even for a large concrete block. It was made for the purpose of provision.

  The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving the intended purpose is a vertically-oriented cylindrical shape for forming a rising outer peripheral surface of a precast concrete block to be manufactured. A peripheral formwork member, and a bottom formwork member fitted and installed on an inner bottom portion of the peripheral formwork member, the peripheral formwork member having a paper material formed in a cylindrical shape. The bottom formwork member is configured as a precast concrete block manufacturing formwork characterized in that the bottom formwork member is formed of a metal material having a shape in which an end face of a desired shape of the precast concrete block is formed.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the bottom formwork member is fixed on an upper side of a support frame that is supported on a formwork support floor and is self-supporting. The cylindrical peripheral surface formwork member is fitted on the outer periphery of the member and the lower end thereof is supported on the formwork support floor.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a plurality of vertical butterflies are arranged along the outer peripheral surface of the peripheral surface formwork member at a desired interval. That is, the peripheral formwork member is reinforced by tightening the outside with a tightening tool.

  In the precast concrete block manufacturing form according to the present invention, a peripheral surface formwork member having a vertically-oriented cylindrical shape for forming the rising outer peripheral surface of the precast concrete block to be manufactured, and the peripheral surface formwork member A bottom formwork member fitted to the bottom, and the peripheral formwork member is made of a paper material formed in a cylindrical shape, and the bottom formwork member is desired for the precast concrete block. Since the peripheral surface formwork member is a much cheaper paper material than the metal material because it is configured with a metal material shaped so that the end face of the shape is molded, it is assumed that it is disposable once each time However, the cost can be reduced compared to the case of using metal material as a whole, and the metal material is used only for the bottom formwork member, which has a complicated shape and a heavy weight. It reduces the mold manufacturing costs by, and since the bottom formwork member can be re-used, even when using the small number, it is possible to manufacture the concrete blocks at low cost.

  Further, in the present invention, the bottom formwork member is fixed on the upper side of a support frame that is supported on a formwork support floor and is self-supporting, and the bottom surface formwork member is arranged on the outer periphery of the bottom formwork member. By fitting the members and supporting the lower end on the formwork support floor, the assembly of the peripheral formwork members becomes easy, and the formwork can be assembled with little effort without using special equipment. Assembly becomes possible.

  In the present invention, the peripheral formwork member is reinforced by causing vertical flaps to follow the outer peripheral surface of the peripheral formwork member at a desired interval and tightening the outer side of the vertical flap with a winding fastener. As a result, the formwork can be reinforced with a simple structure, and the cost can be reduced.

It is a longitudinal cross-sectional view which shows an example of the precast concrete block manufacturing formwork which concerns on this invention. It is a top view same as the above. (A)-(e) is explanatory drawing which shows an example of the process from the assembly of a mold shown in FIG. 1 to the demolding after concrete placement. It is a longitudinal cross-sectional view which shows the usage example of the block manufactured by the mold shown in FIG.

  Next, an embodiment of a precast concrete block manufacturing form according to the present invention will be described based on the examples shown in the drawings. FIG. 1 shows an outline of a formwork according to the present invention, and a concrete block manufactured by this formwork is a block (pile pile) installed on a pile head on the offshore side of a pile-type wave breaking structure shown in FIG. Head block) A is manufactured.

  This block A is for closing the opening of the pile through-hole 3 of the wave-dissipating structure 2 supported by the pile 1, and the upper surface 4 is aligned with the inclination of the upper edge of the front surface of the wave-dissipating structure 2. It is comprised from the inclined surface part 4a and the plane part 4b which followed this.

  Further, the block A has a cylindrical shape in which the mortar filling gap 6 is formed between the rising outer peripheral surface 5 and the inner peripheral surface of the pile through hole 3 when the block A is inserted into the pile through hole 3. It has become. Further, a connecting rebar 9 embedded in the mortar 8 for closing the upper end of the pile is protruded from the bottom surface 7 of the block A.

  The mold shown in FIG. 1 for manufacturing the block A is formed so that the block A is inverted, that is, with the bottom surface 7 facing upward, and a vertical cylindrical shape that molds the rising outer peripheral surface 5 of the block A. The peripheral surface formwork member 11 and the bottom surface formwork member 12 fitted and installed on the inner bottom portion thereof are provided.

The peripheral formwork member 11 is composed of a paper material formed in a cylindrical shape. As this paper material, a commercially available formwork paper material having performances such as surface smoothness, strength and waterproofness as a formwork is used.
The bottom formwork member 12 has an end surface of a desired shape of the block A, that is, a flat surface, and has a circular portion, an inclined portion 12a for forming the inclined surface portion 4a and the horizontal surface portion 4b of the upper surface 4 of the block A, and a horizontal portion 12b. It is comprised with the metal material which consists of. As this metal material, a steel material which is a material usually used for metal molds can be used.

  The bottom surface mold member 12 is supported by a support frame 13 on the lower surface. The support frame 13 is configured by assembling a steel material 14 having an L-shaped cross section, is self-supporting on a flat formwork support floor 15 at a work site, and is strong enough to support all loads applied to the bottom formwork member 12. In addition to being formed, the bottom mold member 12 is formed in such a size that there is no portion protruding outside.

  The peripheral surface formwork member 11 is a cylindrical body cut to a desired length, and is fitted to the outside of the bottom face formwork member 12, with its lower end supported on the formwork support floor 15 and erected. It has come to be.

  On the outer periphery of the peripheral surface formwork member 11, a plurality of vertical flaps 16, 16... Are vertically arranged at intervals in the circumferential direction. The outer periphery is tightened by a winding fastener 17, thereby reinforcing the outside of the peripheral surface formwork member 11.

As an example, the vertical flap 16 is made of wooden squarewood. In addition, a band made of a metal band-like material is used for the winding fastener 17 as an example. The winding fastener 17 is formed with bent pieces 17a, 17a, which are bent at right angles, at both ends, and the winding fastener 17 is wound around the outer periphery of the vertical flaps 16, 16,. The vertical butterfly 16 and the winding fastener 17 are mounted by tightening the bent pieces 17a, 17a in the direction of pulling them together with the tightening bolts 18.
The winding fastener 17 may be a band made of synthetic resin or a metal linear material in addition to a metal band, and is wound around the outer periphery of the vertical flaps 16, 16,. Any desired fastening force can be used.

  Between the peripheral surface formwork member 11 and the inclined portion 12a of the bottom face formwork member 12, separators 20, 20,... This reinforces between the peripheral surface formwork member 11 and the bottom surface formwork member 12 to which a large load acts when placing concrete, and is the same rod-shaped material 21 as is normally used as a separator for the formwork. And fixtures 22 and 22 for fixing both ends thereof to the peripheral surface formwork member 11 and the inclined portion 12a of the bottom face formwork member 12, and the fixtures 22 are refilled on the concrete surface during demolding. It uses a structure that can be removed while leaving a hole.

  Since the bottom formwork member 12 in the present embodiment forms the inclined surface portion 4a of the upper surface 4 of the block A described above, it is a part that receives a large amount of concrete load placed in the formwork, and this Since it is an inclined surface, a component force in the opening direction acts between the inclined portion 12a and the circumferential surface formwork member 11 when placing concrete, but it is reinforced by the presence of the separators 20, 20,. The deformation of the formwork is prevented.

  In assembling the thus configured mold and manufacturing the block A using the same, as shown in FIG. 3A, the bottom mold member 12 supported by the support frame 13 is used as the mold support floor. 3, and fitted onto the outer periphery of the bottom mold member 12 so as to cover the cylindrical peripheral mold member 11 from above, as shown in FIG. The lower end of the member 12 is erected while being supported on the formwork support floor 15.

  Thereafter, as shown in FIG. 3 (c), the reinforcing bar 25 constituting the block A is inserted into the peripheral formwork member 11, and a necessary spacer (not shown) is used for the bottom formwork. It is accommodated in a concrete placement space formed by the member 12 and the peripheral formwork member 11.

  The reinforcing bar 25 may be placed on the bottom formwork member 12 before the circumferential formwork member 11 is mounted.

  In this way, the reinforcing bar 25 is installed in the concrete placing space, and the separators 20, 20... Described above are installed at preset installation locations.

  Next, as shown in FIG. 3 (d), the required number of vertical flaps 16, 16,... Are placed on the outer side of the peripheral formwork member 11, and the fastening tool 17 is wound around and fixed. After the assembly and installation of the reinforcing bar 25 are completed, the concrete is filled from the upper opening of the circumferential surface formwork member 11 and filled to a predetermined height, and then the upper surface thereof, that is, the bottom surface of the block A is finished. Finish the concrete filling.

  After filling the concrete, after a predetermined curing time, the mold is removed as shown in FIG. For removal from the mold, the winding fastener 17 is removed, the vertical flap 16 is removed, the fixing tool 22 of the separator 20 is removed, and the peripheral surface formwork member 11 is removed. The peripheral formwork member 11 can be removed by pulling it upward without breaking its cylindrical shape and reusing it when possible, but if the quality has deteriorated so that it cannot be reused, cut it off. And peel off.

  After removing the peripheral surface formwork member 11 in this way, the vertical direction of the block A is reversed so as to be the direction of installation on the pile head.

  The manufacture of the block A using the formwork having the above-described configuration is to produce the block A upside down, and the upper surface side including the inclined surface portion 4a of the block A is a metal bottom formwork member. It is easy to make the upper end side of the block A that has a special shape and constitutes the surface portion of the wave-dissipating structure with high quality, and has an inclined surface portion. It becomes easy to form the upper side surface including 4a on a precise, clean and highly accurate surface without requiring a finishing operation.

  In the above-described embodiment, the example in which the block end shape formed by the bottom formwork member is the inclined surface of the top of the cylinder has been described, but in addition to this, according to various block end shapes as necessary. Can be used.

  Further, in the above-described embodiments, the case where the peripheral surface formwork member is a cylinder is shown, but in addition to this, a triangular shape, a square shape, other polygonal shapes, or an irregularly shaped cylindrical shape may be used.

A block 1 pile 2 wave-dissipating structure 3 pile through-hole 4 upper surface 4a inclined surface portion 4b flat surface portion 5 rising outer peripheral surface 6 mortar filling gap 7 bottom surface 8 pile top opening closing mortar 9 connecting rebar 11 peripheral surface frame member DESCRIPTION OF SYMBOLS 12 Bottom formwork member 12a Inclined part 12b Horizontal part 13 Support frame 14 Steel material 15 Formwork support floor 16 Vertical flap 17 Winding fastener 17a Bending piece 18 Tightening bolt 20 Separator 21 Rod material 22 Fixing tool 25 Reinforcing rod

Claims (3)

A member for a peripheral surface formwork that has a vertical cylindrical shape for forming a rising outer peripheral surface of a precast concrete block to be manufactured, and a bottom surface formwork member that is fitted and installed on the inner bottom of the peripheral surface formwork member With
The peripheral surface formwork member is configured with a paper material formed in a cylindrical shape, and the bottom surface formwork member is configured with a metal material having a shape in which an end surface of a desired shape of the precast concrete block is formed. Precast concrete block manufacturing formwork characterized by that.   The bottom surface formwork member is fixed on the upper side of a support frame that is supported on a formwork support floor and is self-supporting, and the cylindrical peripheral surface formwork member is fitted on the outer periphery of the bottom surface formwork member. The precast concrete block manufacturing formwork according to claim 1, wherein the formwork is erected by supporting a lower end on the formwork support floor.   2. The circumferential formwork member is reinforced by causing vertical flaps to follow the outer peripheral surface of the circumferential formwork member at a desired interval and tightening the outside of the vertical form with a tightening tool. The precast concrete block manufacturing form described in 2.

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