JP2675724B2 - PC product molding frame and method for manufacturing PC product using the molding frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

INDUSTRIAL APPLICABILITY The present invention enables immediate demolding of PC (precast concrete) products by filling concrete in the space between inner and outer molds arranged substantially concentrically and vibrating and compressing it. The present invention also relates to a mold for molding a PC product in which the PC product is demolded along the 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, for molding a PC product, for example, a hollow product such as a concrete pipe or a PC pillar formwork for construction, an inner form and an outer form having a shape along the inside and the outside of the PC product. After arranging these inner and outer molds substantially concentrically using a mold, concrete is filled in the space between both molds, and after that, the mold is released when the concrete is solidified or hardened. ing.

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 has been proposed that a molding formwork is filled with zero slump concrete, and this is pressed on a vibrating table to accelerate the solidification of concrete and enable immediate mold release. There is.

[0004] By the way, the hollow P
When manufacturing C products, the inner and outer molds are made of steel in order to increase the number of diversions, and these inner and outer molds are removed in the direction of the cylinder axis of the PC product. I have.

[0005]

However, in such a conventional mold for molding a PC product, when the PC product is demolded, the inner and outer molds are pulled out in the axial direction of the PC product as described above. Therefore, it was not possible to form uneven portions on the inner or outer surface of the molded PC product. For example, when molding a PC pillar formwork 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. There is a problem in that the binding property with the post-cast concrete is deteriorated, and further, the strength of the concrete column cannot be further increased.

In view of such conventional problems, the present invention is capable of forming an uneven portion on the surface of a PC product even when the PC product is demolded along the molding surface of the mold. An object is to provide a molding frame and a method for manufacturing a PC product using the molding frame.

[0007]

In order to achieve such an object, the first structure of the PC product molding frame of the present invention is
After arranging the outer molds substantially concentrically, in a mold for filling the space between both molds with concrete to mold a PC product, an uneven member is provided on the molding surface of the inner mold so as to be able to move forward and backward. The concave-convex member is provided and the concrete is filled in the advanced state of the concave-convex member, and the concave-convex member is retracted toward the inner mold side so as to be released from the concrete at the time of demolding.

In this structure, the concavo-convex member is formed in various lengths, and the P surface to be molded is formed on the molding surface of the inner mold.
The length may be freely adjusted by combining them according to the length of the C product.

Further, a hydraulic cylinder may be arranged in the inner mold frame so as to be movable back and forth, and the concavo-convex member may be attached to the hydraulic cylinder.

Further, in order to achieve the above object, the second construction of the PC product molding mold of the present invention is such that the inner and outer molds are arranged substantially concentrically and then in the space between both molds. In a mold for filling a PC product by filling with concrete, a concavo-convex member is detachably provided on the molding surface of the inner mold, and concrete is filled in a state where the concavo-convex member is mounted. It is configured to be separated from the inner mold.

In order to achieve the above object, the third construction of the PC product molding mold of the present invention is such that after the inner and outer molds are arranged substantially concentrically, a space is formed between the molds. In a mold for filling concrete with PC to form a PC product, a concavo-convex member capable of expanding and contracting is provided on the molding surface of the inner mold, and the concrete is filled in the expanded state of the concavo-convex member, and the mold is released from the concrete at the time of demolding. In order to achieve this, the concavo-convex member is contracted.

In order to achieve the above object, in the first method of manufacturing a PC product using the molding mold of the present invention, after the inner and outer molds are arranged substantially concentrically. In a method for manufacturing a PC product by filling the space between both molds with concrete, a concave-convex member provided on the molding surface of the inner mold so as to be able to move back and forth is held in a state of advancing from the molding surface. And then filling with concrete, and after the filled concrete has solidified, the concavo-convex member is retracted toward the inner mold side, and the PC product is demolded along the molding surface of the mold. .

In the method, the concavo-convex member is formed to have various lengths, and the length is adjusted by combining it with the molding surface of the inner frame according to the length of the PC product to be molded. Is also good.

Further, a hydraulic cylinder may be arranged in the inner mold frame so as to be movable back and forth, and the concavo-convex member may be attached to the hydraulic cylinder for manufacturing.

Furthermore, in order to achieve the above object, in the second method of manufacturing a PC product using the molding frame of the present invention, the inner and outer molds are arranged substantially concentrically. rear,
In a method of manufacturing a PC product by filling the space between both molds with concrete, the concavo-convex member detachably provided on the molding surface of the inner mold is filled with concrete while being attached to the molding surface. A step of removing the concavo-convex member from the inner mold after the filling concrete has solidified, and removing the PC product together with the concavo-convex member along the molding surface of the mold; And a step of separating the uneven member.

In order to achieve the above object, in a third method of manufacturing a PC product using the molding frame of the present invention, after the inner and outer molds are arranged substantially concentrically, In a method of filling a space between molds with concrete to manufacture a PC product, a step of expanding the inflatable and concavo-convex member provided on the molding surface of the inner mold to fill the concrete,
A step of shrinking the concavo-convex member after the filled concrete is solidified, and removing the PC product from the mold along the molding surface of the mold.

[0017]

In the PC product molding frame of the present invention having the above-described structure, the concavo-convex member provided on the molding surface of the inner frame so as to be able to move forward and backward is held in the advanced state to fill the concrete. The filled concrete is molded into an uneven shape by the uneven member. Then, at the time of demolding, the concave-convex member is retracted toward the inner mold side so as to be released from the filled concrete, so that the PC product to be demolded can be smoothly extracted from the mold without being caught on the concave-convex 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.

At this time, the concavo-convex member is formed to have various lengths, and the length is freely adjustable by combining it on the molding surface of the inner mold according to the length of the PC product to be molded. In this case, the uneven portion can be formed over the entire length direction according to the length dimension of the PC product to be manufactured.

Further, if a hydraulic cylinder is arranged in the inner form frame so as to be able to move forward and backward, and the concavo-convex member is attached to the hydraulic cylinder for manufacturing, the advance stroke amount of this hydraulic cylinder is increased. The amount of protrusion of the concavo-convex member from the molding surface of the inner mold can be appropriately changed by adjusting the size to be small or small, and a certain degree of freedom can be secured in the formation depth of the concavo-convex portion, while The concavo-convex member can be held in position by resisting the compaction force of the filled concrete by the hydraulic pressure retained in the hydraulic cylinder, and the concavo-convex portion can be formed with high dimensional accuracy.

Further, a concave and convex member is detachably provided on the molding surface of the inner mold, and concrete is filled between the molds in a state where the concave and convex member is mounted, so that the filled concrete has a concave and convex shape by the concave and convex member. Molded. And
By removing the uneven member from the inner mold during demolding, the PC product to be demolded can be smoothly removed from the mold together with the uneven member. Then, by separating the concavo-convex member from the demolded PC product, a concavo-convex portion can be formed on the inner surface of the PC product, and when the PC product is demolded along the molding surface of the mold, It enables the formation of irregularities.

Further, by providing an uneven member capable of expanding and contracting on the molding surface of the inner mold and filling the mold with concrete in the expanded state of the uneven member, the filled concrete is made into an uneven shape by the uneven member. Molded. By contracting the uneven member so as to release it from the concrete at the time of demolding, the PC product to be demolded can be smoothly pulled out from the mold without being caught by the uneven member. Even when the PC product is removed from the mold along the contours, an uneven portion can be formed on the inner surface of the PC product.

[0022]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of a PC product molding frame 10 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 mold 10 (hereinafter referred to as molding mold) 10 shown in this embodiment molds the building PC pillar mold 12 (see FIG. 4) as a PC product. As shown in FIG. 5, the inner mold 14 and the outer mold 1 are
6 and the inner and outer mold forms 14 and 16 are concentrically combined and arranged to form a space portion 1 formed between them.
8 is filled with concrete from a hopper 20. Vibration is applied to the outer form 16 by a vibrator 22, and the filled concrete is compacted by the additional vibration. Also,
In this way, the concrete is compacted by the vibrator 22, and the pressurizer 24 is moved downward to apply a pressing force to the concrete, so that the concrete is pressed compactly and the solidification of the concrete is promoted. Has become. Then, when the concrete is solidified, the inner and outer mold frames 14 and 16 are pulled out upward to be removed from the mold.

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 A concave-convex member 30 is provided at each of the outer corners of the inner mold frame 14 which is the molding surface 14a so as to be able to move outward and backward. The concavo-convex member 30 is, as shown in FIG.
The recessed and projecting pieces 34 are formed in the recesses 32 formed at the corners of the space 4.
It is configured so as to be slidable toward. The projecting / retracting piece 34 has a large number of concavo-convex portions formed integrally and continuously in the up-down direction, and the concavo-convex portions are the space portions 18.
It is attached so that it can be moved in and out.

A bracket 40 is attached to the upper end of the projecting and retracting piece 34.
Is mounted, a bracket 42 is mounted on the upper surface of the inner frame 14 so as to face the bracket 40, and a position adjusting bolt 44 is mounted between the brackets 40 and 42. Then, with the position adjusting bolt 44,
The retracted position (the state shown in FIG. 2) and the retracted position (the state shown in FIG. 3) of the projecting and retracting piece 34 are fixed. Although not shown, this structure is also provided on the bottom surface of the inner mold form 14. Further, with respect to the gap formed in the concave portion 32 as the projecting and retracting piece 34 advances, the gap is filled and resists the compaction force of the filling concrete, and the projecting and retracting piece 34 is held in position to form the uneven portion with high dimensional accuracy. The liner 36 is designed to be inserted and removed freely.

In the molding frame 10 having such a structure, first, the projecting and retracting piece 34 is moved to the position shown in FIG.
It is fixed in the advanced state shown in (4), and in this state, the space portion 18 between the inner mold form 14 and the outer mold form 16 is filled with concrete 46. Then, when the filled concrete 46 is solidified, the position adjusting bolt 44 is operated to operate the retractable piece 34.
Are retracted into the recess 32. In this way, the infestation piece 34
The column PC mold 12 shown in FIG. 4 is molded by raising the inner mold 14 and the outer mold 16 while removing the mold from the inner mold 14 side.

PC mold 1 for pillars molded in this way
In FIG. 2, uneven portions 48 formed by the uneven member 30 can be formed at the four corners of the inner surface. Therefore, the post-compacting concrete that is placed inside the PC form 12 when the PC form 12 for pillars is to be built on site is constructed so that the concavo-convex portion 48 significantly improves the binding property. The strength of concrete columns can be significantly improved.

Therefore, in the molding mold 10 according to this embodiment, even when the column PC mold 12 is demolded along the molding surface 14a of the inner mold 14, the inner mold 14 is not removed. With the concavo-convex member 30 provided so as to be able to move forward and backward, the concavo-convex portion 48 can be formed on the surface of the column PC mold 12.
Further, since the concavo-convex member 30 is adapted to house the projecting / retracting piece 34 in the concave portion 32 side of the inner formwork 14 so as to be released from the filled concrete at the time of demolding, the concavo-convex member 30 for the column PC mold 12 is formed. It can be smoothly demolded without being caught on. Thus, in this embodiment, the molding frame 10 is used.
Since it is possible to form a concavo-convex shape on the PC mold 12 for pillars molded by, it is possible to significantly improve the degree of freedom in shape of the product.

In this embodiment, the example in which the position adjusting bolt 44 is used for the projecting / retracting piece 34 has been described, but the invention is not limited to this, and a hydraulic operating member, a spring or the like may be used.

By the way, in the above embodiment, the inner formwork 1
Although an example in which a single projecting / retracting piece 34 is attached to each corner of 4 to form the concavo-convex member 30 has been shown, the present invention is not limited to such an embodiment, and as shown in FIG.
Are previously formed with various lengths L1, L2, L3, and the lengths of these projecting and retracting pieces 34 are combined and adjusted according to the length L of the column PC mold 12 to be molded and attached to the inner mold frame 14. It may be manufactured by manufacturing. With this configuration, even if the length dimension of the column PC mold 12 to be manufactured changes, the combination of the protruding and retracting pieces 34 of various sizes L1, L2, and L3 corresponds to the column PC mold 12. The concavo-convex member 30 having the length L can be formed, and the concavo-convex portion 48 can be formed over the entire length of the PC mold 12 for a column.

7 to 9 show modified examples of the above-mentioned embodiment, and the same components as those of the above-mentioned embodiment are designated by the same reference numerals and the duplicate description will be omitted. 7 is a schematic perspective view,
8 is an enlarged cross-sectional view of an essential part showing a state where the concavo-convex member 30 is advanced and filled with concrete 46, and FIG. 9 is an enlarged sectional view of an essential part showing a state where the concavo-convex member 30 is retracted so as to be released from the filled concrete 46. Is.

The basic idea of this modification is the same as that of the above-mentioned embodiment. After the inner and outer molds 14, 16 are arranged substantially concentrically, concrete is placed in the space 18 between the molds 14, 16. When manufacturing the PC mold 12 for a pillar by filling 46,
The step of filling the concrete 46 by holding the concavo-convex member 30 provided on the molding surface 14a of the inner formwork 14 so as to be able to advance and retract from this molding surface 14a, and the concavo-convex member after the filling concrete 46 is solidified. 30 inside formwork 14
And a step of retracting the column PC mold 12 along the molding surfaces of the molds 14 and 16 to the side.
Particularly, in this modification, a hydraulic cylinder 38 is provided in the inner mold 14 so as to be able to move forward and backward, and the concavo-convex member 30 is attached to the hydraulic cylinder 38 to manufacture the column PC mold 12. It is the one.

Referring to the drawings, the inner formwork 14 has:
The inner formwork 1 is provided in the recesses 32 at the respective corners for accommodating the uneven member 30.
4. A plurality of holes 3 are vertically spaced apart along the height direction of 4
8a is formed, and a plurality of hydraulic cylinders 38 are arranged corresponding to each of the holes 38a. The hydraulic cylinder 38 is arranged so that the rod 38b thereof is projected and retracted from the molding surface 14a of the inner mold 14 toward the space portion 18 through the holes 38a, and the concavo-convex member 30 is provided at the tip of the rod 38b. Is attached and the rod 38b of the hydraulic cylinder 38 is driven to move the concavo-convex member 30 back and forth. In particular, the hydraulic cylinder 3 of this embodiment
8 is configured so that the amount of stroke of the rod 38b can be adjusted appropriately. Further, the hydraulic cylinder 38 is configured to maintain the internal hydraulic pressure, and by controlling so as to maintain the hydraulic pressure, it also has a function of maintaining the stroke amount of the rod 38b against an external force. doing. Then, when filling the concrete, the rod 38b of the hydraulic cylinder 38 is projected to advance the concavo-convex member 30 into the space portion 18. On the other hand, when the mold is released, the rod 38b of the hydraulic cylinder 38 is retracted to retract the concavo-convex member 30. Then, it is possible to manufacture the column PC mold 12 having the uneven portion 48 as in the above embodiment. In this embodiment, the hydraulic pressure is used to move the uneven member back and forth.
Although the example using the cylinder 38 has been described, it is not limited to this.
It is possible to simply use bolts and nuts without
No.

In particular, in this modification, the advancing amount of the concavo-convex member 30 from the molding surface 14a of the inner frame 14 is appropriately changed by increasing or decreasing the advancing stroke amount of the rod 38b of the hydraulic cylinder 38. You can
A certain degree of freedom can be secured in the formation depth of the uneven portion 48. In some cases, it is possible to slightly incline the concavo-convex member 30 so that the rods 38b of the upper and lower hydraulic cylinders 38 are slightly different in advance stroke. Also, this hydraulic cylinder 3
By the hydraulic pressure held in 8, the concavo-convex member 30 can be held in position by resisting the consolidation force of the filled concrete 46, and the concavo-convex portion 48 can be formed with high dimensional accuracy.

FIGS. 10 to 13 show another embodiment, and the same components as those of the above embodiment are designated by the same reference numerals and the description thereof will be omitted. Note that FIG. 10 is a plan view, FIG. 11 is an enlarged sectional view of an essential part taken along line BB in FIG. 10, FIG. 12, and FIG.
3 is a cross-sectional view corresponding to FIG. 11 showing an operating state.

That is, as shown in FIG. 10, the molding mold 10a of this embodiment has the same inner and outer molds 1 as those of the above embodiment.
4, 16 are formed in a rectangular shape in cross section, and an uneven member 50 is detachably provided at each of the outer corners of the inner mold frame 14 which will be the molding surface 14a. As shown in FIG. 11, the uneven member 50 has
A bracket 52, which is formed in a comb-teeth shape as a separate body from the inner mold frame 14 and projects from the end surface of the uneven member 50, and the inner mold frame 14
The bracket 54 protruding from the end surface of the
It is detachably attached via 6.

Therefore, in the molding die 10a of this embodiment, with the concavo-convex member 50 mounted on the inner die 14, a space 18 between the inner die 14 and the outer die 16 is provided. Fill with concrete 46. Then, when the concrete 46 is solidified, the mounting bolts 56 are removed, and the concavo-convex member 50 is separated from the inner formwork 14. After the concavo-convex member 50 is separated in this way, the inner mold form 14 and the outer mold form 16 are lifted and released from the mold. Therefore, the concave-convex member 5 is formed by this mold release
0 remains in the state of being attached to the column PC mold 12 as shown in FIG. 12, so that the mold can be smoothly demolded, and after this demolding, as shown in FIG.
By separating 0 from the column PC mold 12, the uneven portion 48 can be formed on the inner side surface of the molded column PC mold 12.

FIG. 14 and FIG. 15 show another embodiment, and the same components as those of the above embodiment are designated by the same reference numerals and the description thereof will be omitted. 14 is an enlarged cross-sectional view of the main part, and FIG. 15 is a cross-sectional view corresponding to FIG. 14 showing the operating state.

That is, in the molding die of this embodiment, as shown in FIG. 14, a gas-expandable expandable / contractible uneven member 60 is formed at each corner of the inner die 14 having a rectangular cross section. It is configured by fixing. The concavo-convex member 60 is formed of a thin sheet having flexibility to have a comb-teeth shape in cross section. By enclosing air pressure inside, the comb-teeth shape is maintained, and by eliminating the air pressure, it is shown in FIG. To be contracted.

Therefore, in the molding formwork of this embodiment, concrete is provided between the inner formwork 14 and the outer formwork 16 in a state where air pressure is enclosed in the concavo-convex member 60 as shown in FIG. Fill 46. Then, when the concrete 46 is solidified, the air pressure inside the concavo-convex member 60 is eliminated, and the concrete 46 is contracted as shown in FIG. By contracting the concave-convex member 60 in this way, a gap is created between the concave-convex member 60 and the column PC mold 12, and in this state, the inner mold 14 and the outer mold 16 are raised to smoothly perform demolding. You can Then, the concavo-convex portion 48 can be formed on the demolded column PC mold 12 as in the above-described embodiments.

In each of the above-mentioned embodiments, the molding form 10 for manufacturing the PC form 12 for a pillar is explained as an example of a PC product, but the present invention is not limited to this and other PC products. Needless to say, the present invention can be applied to, for example, a molding frame for manufacturing a concrete pipe having a circular cross section.

[0042]

As described above, according to the first aspect of the present invention,
In the PC product molding frame and the PC product manufacturing method using the molding frame shown in 6 and 6, a concavo-convex member is provided on the molding surface of the inner frame so that the concavo-convex member can be moved back and forth. Since the space between the inner and outer molds is kept filled with concrete, and when the mold is removed, the concavo-convex member is retracted to the inner mold side so as to be released from the concrete, Even when the PC product is demolded along the molding surface of (1), the mold can be smoothly pulled out without being caught by the uneven member. Therefore, a concavo-convex portion can be formed on the inner surface of the tubular PC product formed along the shape of the space between the inner and outer molds, and the degree of freedom in the shape of the product can be greatly improved. .

Further, P according to claims 2 and 7 of the present invention
In a method for manufacturing a C product molding frame and a PC product using the molding frame, the uneven member is formed in various lengths, and the PC to be molded is formed on the molding surface of the inner frame. Since the product is manufactured by combining and adjusting the length according to the length of the product, it is possible to form an uneven portion over the entire length direction according to the length dimension of the PC product to be manufactured. it can.

Further, P according to claims 3 and 8 of the present invention
In the C product molding frame and the method for manufacturing a PC product using the molding frame, a hydraulic cylinder is provided in the inner mold frame so as to be able to move forward and backward, and the unevenness is formed on the hydraulic cylinder. Since the member is attached and manufactured, the amount of protrusion and recess of the concavo-convex member from the molding surface of the inner mold can be appropriately changed by increasing or decreasing the advancing stroke amount of this hydraulic cylinder. It is possible to secure a certain degree of freedom in the formation depth of the part, and on the other hand, the uneven pressure member can be held in position by resisting the consolidation force of the filled concrete by the hydraulic pressure held in this hydraulic cylinder. Can also be formed with high dimensional accuracy.

Further, a mold for molding a PC product according to claims 4 and 9 of the present invention and a PC using the mold for molding the PC product
In the manufacturing method of the product, the concavo-convex member is detachably provided on the molding surface of the inner mold, concrete is filled between the inner and outer molds with the concavo-convex member mounted, and the concavo-convex member is used at the time of demolding. By removing the member from the inner mold, the PC product to be removed from the mold can be smoothly removed from the mold together with the uneven member. By separating the concave-convex member from the released PC product, the concave-convex portion is formed on the inner surface of the PC product even when the cylindrical PC product is removed from the molding surface of the mold. be able to.

Further, a mold for molding a PC product according to claims 5 and 10 of the present invention and a PC using the mold for molding the PC product
In the manufacturing method of the product, a concavo-convex member that can be expanded and contracted is provided on the molding surface of the inner mold, concrete is filled between the inner and outer molds in the expanded state of the concavo-convex member, and the concavo-convex member is used when demolding. The cylindrical P that is going to be released from the mold by shrinking the member.
The C product can be smoothly pulled out without being caught by the uneven member, and various excellent effects can be obtained such that the uneven portion can be formed on the inner surface of the PC product.

[Brief description of the 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.

FIG. 6 is a schematic perspective view showing a modified example of the retractable piece.

FIG. 7 is a schematic perspective view showing a modified example of the above embodiment.

FIG. 8 is an enlarged cross-sectional view of an essential part showing a state in which a concavo-convex member is advanced and concrete is filled.

FIG. 9 is an enlarged cross-sectional view of an essential part showing a state in which the concavo-convex member is retracted in order to release it from the filled concrete.

FIG. 10 is a plan view showing another embodiment of the PC product molding frame according to the present invention.

11 is an enlarged fragmentary cross-sectional view of the in Fig. 10 B-B line.

FIG. 12 is a sectional view corresponding to FIG. 11, showing an intermediate stage of the operating state.

FIG. 13 is a sectional view corresponding to FIG. 11, showing the final stage of the operating state.

FIG. 14 is an enlarged sectional view of an essential part showing another embodiment of the PC product molding frame according to the present invention.

FIG. 15 is a sectional view corresponding to FIG. 14 showing an operating state.

[Explanation of Codes] 10 PC Forming Mold for Product 12 PC for Column
Formwork (PC product) 14 Inner formwork 14a Forming surface 16 Outer formwork 30 Uneven member 38 Hydraulic cylinder 46 Concrete 48 Uneven part 50 Uneven member 60 Uneven member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Masuda 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. Obayashi Corporation Tokyo Head Office (72) Inventor Ritsuo Matsumura 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) Reference JP 62-233206 (JP, A) JP 62- 176806 (JP, A) JP-A-5-16131 (JP, A) JP-A-6-278115 (JP, A)

Claims (10)

(57) [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. PC product molding, characterized in that a concavo-convex member is provided so that it can move back and forth, concrete is filled in the advancing state of the concavo-convex member, and the concavo-convex member is retracted toward the inner mold side to release from the concrete when demolding. Formwork. 2. The concavo-convex member is formed to have various lengths, and the concavo-convex member is provided on the molding surface of the inner mold frame in combination so as to be adjustable in length according to the length of the PC product to be molded. The mold for molding a PC product according to claim 1. 3. The PC product molding according to claim 1, wherein a hydraulic cylinder is arranged in the inner mold frame so as to be able to move forward and backward, and the concavo-convex member is attached to the hydraulic cylinder. Formwork. 4. A mold for molding a PC product by arranging the inner and outer molds substantially concentrically, and then filling the space between the molds with concrete to mold and remove the PC product. Providing a concavo-convex member possible, filling the concrete with the concavo-convex member mounted,
A mold for molding a PC product, wherein the concavo-convex member is separated from the inner mold. 5. 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. A mold for molding a PC product, characterized in that a concavo-convex member capable of contracting is provided, concrete is filled in the expanded state of the concavo-convex member, and the concavo-convex member is contracted so as to be released from the concrete at the time of demolding. 6. 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, wherein the molding surface of the inner mold is A step of filling the concrete by holding the concavo-convex member provided so as to be able to move forward and backward in a state of advancing from the molding surface, and retreating the concavo-convex member to the inner formwork side after the filling concrete is solidified, and the PC product And a step of demolding the mold along the molding surface of the mold, the method for manufacturing a PC product using the mold for molding. 7. The concavo-convex member is formed to have various lengths, and the concavo-convex members are provided on the molding surface of the inner mold frame in combination so as to be adjustable in length according to the length of the PC product to be molded. A method of manufacturing a PC product using the molding frame according to claim 6. 8. The molding die according to claim 6, wherein a hydraulic cylinder is arranged in the inner mold frame so as to be movable back and forth, and the concavo-convex member is attached to the hydraulic cylinder. A method for manufacturing a PC product using a frame. 9. 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, which can be attached to and detached from the molding surface of the inner mold. The step of filling concrete with the concave-convex member mounted on the molding surface, and removing the concave-convex member from the inner mold after the filling concrete has solidified, and the PC product together with the concave-convex member in the mold. PC using a mold for molding, comprising: a step of removing the mold along the molding surface of the frame; and a step of separating the uneven member from the released PC product.
Product manufacturing method. 10. After arranging the inner and outer molds substantially concentrically,
In a method for manufacturing a PC product by filling concrete in a space between both molds, a step of expanding the expandable and concavo-convex member provided on the molding surface of the inner mold to fill the concrete, and filling concrete A step of shrinking the concavo-convex member after the solidification of the mold to remove the PC product from the mold along the molding surface of the mold, producing a PC product using a mold for molding. Method.