JP4488405B2 - Formwork manufacturing method and formwork - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for manufacturing a mold and a mold used for forming a bearing pressure portion of a pile head.

  A frustum-shaped or polygonal frustum-shaped formwork is used to form a truncated cone-shaped pile head (for example, Patent Document 1, Patent Document 2), and temporarily on a concrete slab for raising and lowering materials and equipment. The present invention is also applied to the formation of the provided quadrangular pyramid opening (for example, Patent Document 3 and Patent Document 4).

Conventionally, when manufacturing such a truncated cone-shaped formwork, it is common to round a steel plate cut into a fan shape into a cylindrical shape and join both ends (for example, Patent Document 5).
JP 2002-242207 A (pages 1 to 8 and FIGS. 1 to 7) Japanese Patent Laid-Open No. 2003-27498 (pages 1 to 7, FIGS. 1 to 3) Japanese Patent Laid-Open No. 2001-173230 (page 1 to page 11, FIGS. 1 to 9) Japanese Utility Model Publication No. 5-39154 (pages 1 to 4 and FIGS. 1 to 6) Japanese Patent Application Laid-Open No. 2002-11535 (pages 1 to 6, FIGS. 1 to 6)

  By the way, in order to produce a frustoconical formwork by rounding a steel plate cut into a fan shape into a cylindrical shape and joining both ends, a steel plate is made by cutting a large square material steel plate into a fan shape. The material steel plate has a problem that many parts are wasted.

  In addition, in order to cut a large square material steel plate into a fan shape, it is processed by pressing with a special die, spinning (sparing), or bending an arc-shaped plate. There are methods, but in this case, the press working and spinning work require a mold corresponding to the size of the steel conical mold frame, so that the production cost is high when the production quantity is small. Moreover, in the method of bending and processing an arc-shaped (fan-shaped) plate, the use of the arc-shaped plate causes poor material retention, resulting in an increase in manufacturing cost and inability to cope with dimensional changes.

  This invention is made in view of this point, and it aims at providing the manufacturing method and formwork of a formwork which there are few wasted parts of a material steel plate and can be manufactured more cheaply.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

According to the first aspect of the present invention, in the longitudinal direction of the strip-shaped steel sheet , both the height and the width gradually increase from the edge on one end side to the edge on the other end side at right angles to the longitudinal direction. Forming the bulge of
After forming a plurality of bulging portions on the belt-shaped steel plate, it is a method for manufacturing a formwork, which is rounded into a cylindrical shape and ends are joined together to form a cylindrical body.
According to the second aspect of the present invention, in the longitudinal direction of the strip steel plate , the width is constant and high among the height and width from the edge on one end side to the edge on the other end side at right angles to the longitudinal direction. Forming a plurality of bulges that gradually increase,
After forming a plurality of bulging portions on the belt-shaped steel plate, it is a method for manufacturing a formwork, which is rounded into a cylindrical shape and ends are joined together to form a cylindrical body.

The invention of claim 3 is a method for producing a mold according to claim 1 or claim 2, characterized in that is positioned to project the bulging portion on the inside or outside of the cylindrical body.

According to a fourth aspect of the invention, the cylindrical body is positioned the swollen portion inside or outside of, 1 to claim, characterized in that the expanded portion is in intimate to the tubular body surface is folded in close contact It is a manufacturing method of a formwork given in any 1 paragraph of Claim 3 .

The invention according to claim 5 is the method for producing a form according to any one of claims 1 to 4 , wherein a lid member is joined to the upper surface or the lower surface of the cylindrical body. .

The invention according to claim 6 is the method for manufacturing a mold according to claim 5 , wherein the lid member is placed inside the cylindrical body, and the periphery of the lid member is welded and joined. .
The invention according to claim 7, the lid member mounted on the end face of the cylindrical body is the method for producing a mold according to claim 5, characterized in that joining by welding the peripheral edge of the lid .
Invention of Claim 8 consists of a cylindrical body which rounded the strip | belt-shaped steel plate into the cylinder shape, and joined the edge parts,
The cylindrical body has a plurality of bulging portions in which both height and width gradually increase from an edge portion on one end side toward an edge portion on the other end side.
Invention of Claim 9 consists of a cylinder which rounded a strip shaped steel plate into the shape of a cylinder, and joined end parts,
The cylindrical body has a plurality of bulging portions having a constant width and a gradually increasing height among the height and the width from the edge portion on one end side toward the edge portion on the other end side. is there.

The invention according to claim 10 is the mold according to claim 8 or 9 , characterized in that the bulging portion protrudes inside or outside the cylindrical body.

The invention according to claim 11, wherein the tubular body is positioned the swollen portion inside or outside of, the swollen portion Claim 8 or claims, characterized in that close to the cylindrical body surface bent in close contact Item 12. The form according to Item 9 .

The invention according to claim 12 is the mold according to any one of claims 8 to 11 , wherein a lid member is joined to the upper surface or the lower surface of the cylindrical body.

A thirteenth aspect of the present invention is the mold according to the twelfth aspect of the present invention, wherein the lid member is placed inside the cylindrical body, and the periphery of the lid member is welded and joined.

The invention according to claim 14 is the mold according to claim 12 , wherein the lid member is placed on an end surface of the cylindrical body, and the periphery of the lid member is welded and joined.

  With the above configuration, the present invention has the following effects.

According to invention of Claim 1, 2, and Claim 8 , 9 , In the formwork which forms a some bulging part in a strip | belt-shaped steel plate, rounds it cylindrically, joins edge parts, and makes it a cylinder. In addition, since a steel plate is made by cutting a large rectangular material steel plate into a strip shape, the material steel plate has few wasted parts. In addition, a conventional arc-shaped (fan-shaped) dedicated mold is not required, and it is possible to manufacture at a lower cost, and to cope with dimensional changes. Further, the bulging portion becomes a rib, and the strength of the cylindrical body can be improved.

According to invention of Claim 3 and Claim 10 , a bulging part protrudes in the inner side or the outer side of a cylinder, and it can be set as the formwork according to a use location.

According to invention of Claim 4 and Claim 11 , a bulging part is located inside or outside a cylinder, and this bulging part is brought into close contact and bent, and is brought into close contact with the cylinder surface. Can be a formwork.

According to invention of Claim 5 and Claim 12 , it is a quadrangular pyramid shape temporarily provided in a concrete slab for raising and lowering materials and equipment by joining a cover material to the upper surface or the lower surface of a cylinder. It can also be applied to the formation of an opening portion.

According to invention of Claim 6 and Claim 13 , a cover material can be put into the inside of a cylinder, the periphery of this cover material can be welded, and it can join firmly.

According to invention of Claim 7 and Claim 14 , a cover material can be mounted on the end surface of a cylinder, the periphery of this cover material can be welded, and it can join firmly.

  Hereinafter, although the manufacturing method of a formwork of this invention and embodiment of a formwork are demonstrated, this invention is not limited to this embodiment. The embodiment of the present invention shows the most preferable mode of the present invention, and the terminology of the present invention is not limited to this.

  The production of the mold according to the first embodiment will be described with reference to FIGS.

  FIG. 1 shows a state in which a large rectangular material steel plate 1 is cut into a strip steel plate 2, and the strip steel plate 2 is a strip having a predetermined width, and the material steel plate 1 is a wasteful portion because it is not arcuate (fan-shaped) as in the prior art. There is no. In addition, a conventional arc-shaped (fan-shaped) dedicated mold is not required, and it is possible to manufacture at a lower cost, and to cope with dimensional changes.

  FIG. 2 is a plan view of the strip-shaped steel plate 1 that has been cut. In the longitudinal direction of the strip-shaped steel plate 1, as shown in FIG.

  FIG. 4 shows the longitudinal direction of the strip-shaped steel plate 2 as shown in FIG. 5 from the edge 2b on one end side to the edge 2c on the other end side perpendicular to the longitudinal direction at the position of the bulging portion position index 2a. In addition, a plurality of bulged portions 2d in which at least the height H is gradually increased among the height H and the width W are formed. The bulging portion 2d is formed in a triangular shape (FIG. 5 (a)), a semicircular shape (FIG. 5 (b)), a trapezoidal shape (FIG. 5 (c)), etc. The width may be zero, that is, close (FIG. 5D).

  After forming the plurality of bulging portions 2d on the strip-shaped steel plate 2, the ends 2e and 2f are joined by rounding into a cylindrical shape, and a truncated cone-shaped cylindrical body 20 is formed as shown in FIGS. Manufacturing formwork.

  6 is a front view of the cylindrical body 20, FIG. 7 is a plan view of the cylindrical body 20, and FIG. This formwork consists of a cylindrical body 20 obtained by rounding the strip-shaped steel plate 2 into a cylindrical shape and joining the end portions 2e and 2f to each other, and this cylindrical body 20 is directed from the edge portion 2b on one end side toward the edge portion 2c on the other end side. Thus, at least one of the height H and the width W has a plurality of bulging portions 2 d that gradually increase, and the bulging portion 2 d protrudes from the outer side of the cylindrical body 20. Moreover, the inclination of the truncated cone-shaped cylindrical body 20 can be adjusted by changing the height H and the quantity of the bulging portions 2d.

  In this way, a plurality of bulged portions 2d are formed on the strip-shaped steel plate 2 and rolled into a cylindrical shape to join the end portions 2e and 2f to form a cylindrical body 20. From the large rectangular material steel plate 1, Since the steel plate is made by cutting into strips, the material steel plate 1 has few wasted parts. In addition, a mold is not required, and it can be manufactured at a lower cost, and can cope with various frustoconical shapes. Moreover, the bulging part 2d becomes a rib, and the intensity | strength of the cylinder 20 can be improved. Moreover, although the bulging part 2d protrudes and is located outside the cylindrical body 20, the bulging part 2d may be protruded and located inside, and a form according to the place of use can be obtained.

  Next, the manufacturing of the mold according to the second embodiment will be described with reference to FIGS. The manufacturing of the mold according to the second embodiment is configured in the same manner as the embodiment of FIGS. 1 to 8, but the bulging portion 2d is positioned outside the cylindrical body 20 as shown in FIG. (FIG. 9 (a)), the bulging portion 2d has a width W of zero, that is, close contact (FIG. 9 (b)), and is bent to be in close contact with the cylindrical surface (FIG. 9 (c)).

  Thus, after forming the plurality of bulged portions 2d on the strip-shaped steel plate 2, the ends 2e and 2f are joined together by rounding into a cylindrical shape, and the cylindrical body 20 is formed as shown in FIGS. Manufacturing formwork.

  FIG. 10 is a front view of the cylindrical body 20, FIG. 11 is a plan view of the cylindrical body 20, and FIG. 12 is a bottom view of the cylindrical body 20. The cylindrical body 20 of this formwork is the other end side from the edge 2b on one end side. Of the height H and the width W, the width W is zero, that is, in close contact with the edge portion 2c, and the bulging portion 2d is in close contact with the cylindrical surface. In this embodiment, the bulging portion 2d is positioned on the outer side of the cylindrical body 20. However, the bulging portion 2d may be positioned on the inner side, closely contacted and bent to be in close contact with the cylindrical body surface. can do.

  Next, manufacturing of the mold according to the third embodiment will be described with reference to FIGS. The third embodiment is configured in the same manner as the embodiment of FIGS. 6 to 8, but in this embodiment, the lid member 40 is placed on the end surface of the cylindrical body 20, and the periphery of the lid member 40 is arranged. The parts are welded and firmly joined.

  Next, manufacture of the formwork of 4th Embodiment is demonstrated based on FIG. 16 thru | or FIG. The fourth embodiment is configured in the same manner as the embodiment of FIGS. 13 to 15, but a lid member 40 is joined to the upper surface of the cylindrical body 20. In this embodiment, the lid member 40 is put inside the cylindrical body 20 and the peripheral edge 40a of the lid member 40 is joined by spot welding 41, but the lid member 40 is similarly attached to the lower surface of the cylindrical body 20. You may join by spot welding. FIG. 19 shows an application state of the formwork. The cylindrical body 20 of the formwork of the fourth embodiment is discarded and attached before placing the concrete 21, and the bearing section 32 is constructed on the pile head 31a. Used when The bearing portion 32 of the pile head 31a is a frustum-shaped support structure that supports a structure foundation (footing foundation) 33 or a foundation beam.

  In the embodiment shown in FIGS. 1 to 19, the cylindrical body 20 of the mold is in the shape of a truncated cone, but a polygonal frustum-shaped mold may be manufactured as shown in FIG. In this case, it is advantageous that the bulging portion 2d is brought into close contact with each other, and is bent in either one to be brought into close contact with the cylindrical surface.

  This method for manufacturing a mold and the mold are used for forming a truncated cone-shaped pile head, and can also be applied to forming an opening temporarily provided in a concrete slab for raising and lowering materials and equipment.

It is a figure which shows the state cut | disconnected from a large square material steel plate to a strip | belt-shaped steel plate. It is a top view of the strip | belt-shaped steel plate cut | disconnected. It is a figure which shows the state which performs a bulging part position index at substantially equal intervals. It is a figure which shows the state which formed the several bulging part in the longitudinal direction of a strip | belt-shaped steel plate. It is a figure which shows embodiment of a bulging part. It is a front view of the cylinder of a 1st embodiment. It is a top view of the cylinder of a 1st embodiment. It is a bottom view of the cylinder of a 1st embodiment. It is a figure which shows other embodiment of a bulging part. It is a front view of the cylinder of a 2nd embodiment. It is a top view of the cylinder of a 2nd embodiment. It is a bottom view of the cylinder of a 2nd embodiment. It is a front view of the cylinder of a 3rd embodiment. It is a top view of the cylinder of a 3rd embodiment. It is a bottom view of the cylinder of a 3rd embodiment. It is a front view of the cylinder of a 4th embodiment. It is a top view of the cylinder of a 4th embodiment. It is a bottom view of the cylinder of a 4th embodiment. It is a figure which shows the application state of a formwork. It is a figure which shows embodiment which manufactures a polygon frustum-shaped formwork.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Material steel plate 2 Strip | belt-shaped steel plate 2a A bulging part position index 2d A bulging part 20 Cylindrical body 19

Claims (14)

In the longitudinal direction of the strip-shaped steel sheet, a plurality of bulging portions in which both the height and the width are gradually increased from the edge portion on one end side to the edge portion on the other end side at right angles to the longitudinal direction are formed,
A method for manufacturing a mold, comprising forming a plurality of bulging portions on the strip-shaped steel plate, and then rolling the tube-shaped steel plate into a cylindrical shape to join ends to form a cylindrical body. In the longitudinal direction of the strip-shaped steel plate, a plurality of bulged portions having a constant width and a gradually increasing height from the edge on one end side to the edge on the other end side at right angles to the longitudinal direction Form the
A method for manufacturing a mold, comprising forming a plurality of bulging portions on the strip-shaped steel plate, and then rolling the tube-shaped steel plate into a cylindrical shape to join ends to form a cylindrical body. The method for manufacturing a mold according to claim 1 or 2 , wherein the bulging portion is positioned so as to protrude inside or outside the cylindrical body. The cylindrical body to position the said bulging portion inside or outside of any one of claims 1 to 3, characterized in that the expanded portion is in intimate to the tubular body surface is folded in close contact The manufacturing method of the formwork of description. The method of manufacturing a mold according to any one of claims 1 to 4 , wherein a lid member is joined to the upper surface or the lower surface of the cylindrical body. The lid placed inside the cylinder, the mold manufacturing method according to claim 5, characterized in that joining by welding the peripheral edge of the lid. 6. The method for manufacturing a mold according to claim 5 , wherein the lid is placed on an end surface of the cylindrical body, and the periphery of the lid is welded and joined. It consists of a cylindrical body obtained by rounding a strip steel plate into a cylindrical shape and joining the ends together.
The tubular body has a plurality of bulging portions in which both the height and the width gradually increase from an edge portion on one end side toward an edge portion on the other end side. It consists of a cylindrical body obtained by rounding a strip steel plate into a cylindrical shape and joining the ends together.
The cylindrical body has a plurality of bulging portions having a constant width and a gradually increasing height from the edge portion on one end side toward the edge portion on the other end side. The form according to claim 8 or 9 , wherein the bulging portion protrudes inside or outside the cylindrical body. The formwork according to claim 8 or 9 , wherein the bulging portion is positioned inside or outside the cylindrical body, and the bulging portion is closely contacted and bent to be in close contact with the cylindrical body surface. The formwork according to any one of claims 8 to 11 , wherein a lid member is joined to an upper surface or a lower surface of the cylindrical body. The formwork according to claim 12 , wherein the lid member is placed inside the cylindrical body, and the periphery of the lid member is welded and joined. The formwork according to claim 12 , wherein the lid member is placed on an end surface of the cylindrical body, and a peripheral edge of the lid member is welded and joined.

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