JP2014181439A - Form device for prismatic concrete structure and construction method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form device for prismatic concrete structure which has excellent work efficiency, with which a construction period can be shortened, and which can deal with a plurality of cross-sectional sizes of a prismatic concrete structure.SOLUTION: Half-split form bodies 2-1, 2-2 have mold forms 10 having inner peripheral surfaces corresponding to substantially-semiperipheral surfaces of the outer peripheral surface of a prismatic concrete structure, wooden support materials 11 fixed at a prescribed interval along the longer direction to the outer peripheries of the mold forms 10, and holding members 15 fixed at an interval to the outer peripheries of the wooden support materials 11 so as to be orthogonal to the longer direction. The holding members 15 are so constituted that two beam members 16, 17 are fixed via corner fixing guides 18 at the intersections. The corner fixing guide 18 is formed so that it is firmly fixed to one end of one beam member 16 and supports one end of the other beam member 17 in a slidable manner. A post-fitting fixing guide 25 supporting the other end of the one beam member 16 in a slidable manner is provided on the other end of the other beam member 17.

Description

  The present invention relates to a formwork apparatus suitable for constructing a prismatic concrete structure and a construction method of a prismatic concrete structure using the same.

Reinforced concrete prismatic structures are widely used. In order to make a prismatic structure made of reinforced concrete, conventionally, a reinforcing bar for a structure is first arranged on the ground, and this is erected at a predetermined position. Next, a concrete formwork is made by assembling a plurality of formwork divisions on the outside of the reinforced steel bars using a moving scaffold or a stepladder. Next, concrete is placed inside the concrete formwork. Finally, after the concrete is hardened, a plurality of formwork divisions are disassembled using a moving scaffold or a stepladder, and the concrete formwork is removed.
When making a lot of such reinforced concrete structures, the assembly work and disassembly work of the formwork using moving scaffolds and stepladders are particularly troublesome and cumbersome. The work efficiency is poor, and therefore the construction period is lengthened and the construction cost is also increased.

The applicant has previously filed a patent application for a formwork device for a prismatic concrete structure that has a high work efficiency and can shorten the construction period, and a method for constructing a prismatic concrete structure using the same. (Hereinafter referred to as “Prior Art 1”, see Patent Document 1)
In addition, the cast-in-place reinforced concrete columns can be easily constructed, and even if the size of the concrete columns changes, it can be handled with a single horizontal fastening bracket. A construction method has been proposed (hereinafter referred to as “Prior Art 2”, see Patent Document 2).

JP 2009-174233 A Japanese Patent No. 4279339

The above prior art 1 is an epoch-making technique in that the work efficiency is good and the construction period can be shortened. However, the formwork holding member is limited to the case where the cross-sectional size of the concrete structure is one, and concrete When the cross-sectional size of the structure is changed, it is necessary to prepare another mold holding member, and there is a problem that the manufacturing cost of the mold holding member and the storage space increase.
On the other hand, in the above prior art 2, the structure is such that even if the size of the concrete pillar changes, it can be accommodated by one horizontal fastening bracket, but the four pieces arranged along each surface of the formwork panel. And four right angle elbows that are inserted into and removed from these connection pipes at the end thereof, so that when the side pressure is applied to the formwork panel after the concrete is placed, There was a problem that it was not possible to smoothly insert and remove the right angle elbow, and it was difficult to remove the column form unit.

  The present invention relates to a formwork device for a prismatic concrete structure that has good work efficiency and can shorten the work period, and a method for constructing a prismatic concrete structure using the same, and the holding member of the formwork is a concrete structure. Provides a method for constructing a prismatic concrete structure using the formwork device for a prismatic concrete structure that can accommodate a plurality of cross-sectional sizes and can be easily detached from the formwork device after placing concrete. The purpose is to do.

In order to achieve the above object, a formwork apparatus for a prismatic concrete structure according to the present invention is firstly a formwork apparatus for constructing a prismatic concrete structure, wherein the formwork apparatus comprises A pair of halved molds formed so as to extend along substantially a half circumferential surface of a prismatic concrete structure are coupled to each other at their joint ends by fastening members, and the halved molds Is a mold having an inner peripheral surface corresponding to a substantially half peripheral surface of the outer peripheral surface of the prismatic concrete structure, a wooden support material fixed to the outer peripheral portion of the mold frame at a predetermined interval along the longitudinal direction, and A holding member fixed to the outer periphery of the wooden support member at an interval so as to be orthogonal to the longitudinal direction,
In the holding member, two beam members are fixed at a crossing portion via a corner fixing guide, and the corner fixing guide is fixed to one end of one beam member, and the other beam member is fixed. The other end of the other beam member is slidably supported, and the other end of the one beam member is slidably supported by a rear fixing guide. Yes.
According to this feature, since the holding member can correspond to a plurality of cross-sectional sizes of a prismatic concrete structure, a plurality of cross-sectional sizes can be handled with one type of holding member without preparing a plurality of holding members. A possible formwork device can be manufactured. Further, it is possible to provide a formwork device for a prismatic concrete structure in which the formwork device can be easily detached after placing concrete.

In addition, the formwork apparatus for a prismatic concrete structure according to the present invention is, secondly, in the first feature, a long reinforcing member is in contact with the outer surface of the holding member and is orthogonal to the holding member. Between the reinforcing members which are disposed and which are opposed to each other, a fastening means for fastening these reinforcing members inward is provided.
According to this feature, since the holding member is tightened inward by the reinforcing member, it is possible to reliably prevent the formwork from expanding due to the internal pressure of the placed concrete, and to form a concrete column of a predetermined size. it can.

Old 0008
The formwork device for a prismatic concrete structure according to the present invention is thirdly characterized in that, in the first or second feature, each of the two beam members is made of H-shaped steel. .
According to this feature, the formwork apparatus has a strength that can sufficiently withstand the pressure of the placed concrete, and can easily follow the change in the cross-sectional size of the prismatic concrete.

According to a fourth aspect of the present invention, in any one of the first to third features, the corner fixing guide is in contact with the other beam member. A tightening member for stopping relative movement between the corner fixing guide and the other beam member is provided.
According to this feature, the two beam members can be reliably fixed via the corner fixing guide.

In addition, the formwork device for a prismatic concrete structure according to the present invention is fifthly, in any one of the first to fourth features, the retrofit fixing guide is fixed to the other end of the other beam member. A fastening member is provided that is detachably fixed by a bolt, and that abuts against the other end of the one beam member to stop the relative movement between the retrofit fixing guide and the one beam member. It is characterized by that.
According to this feature, a pair of half-shaped frame bodies can be easily joined at the joint end portions, and the joined end portions of the pair of half-shaped frame bodies after joining are securely fixed. be able to.

Further, the method for constructing a prismatic concrete structure according to the present invention comprises a formwork, a wooden support material, a holding member, and a reinforcing member on the ground when constructing a prismatic concrete structure. A pair of half-shaped frame bodies formed so as to extend along the substantially half-peripheral surface of each other, and the pair of half-shaped frame bodies are coupled to each other by a fastening member at their joint ends to form a prismatic concrete structure After forming the formwork device corresponding to the outer peripheral surface of the object, the formwork device is lifted upward and installed at the position of a prismatic concrete structure to be placed, and the concrete is placed in the formwork of the formwork device. After the concrete is solidified, the bond between the pair of halved molds is loosened to expand the formwork apparatus. In this state, the formwork apparatus is lifted from above, and the formwork apparatus is Columnar concrete structure It is detached from the outer peripheral surface, and formed on the ground again on the formwork device corresponding to the outer peripheral surface of the prismatic concrete structure to be placed next, and then the formwork device is lifted upward and then placed. It is characterized in that it is installed at the position of a rectangular pillar-shaped concrete structure and concrete is placed in the formwork apparatus.
According to this feature, it is possible to provide a method for constructing a prismatic concrete structure that has high work efficiency and can shorten the construction period. In addition, it is possible to provide a method for constructing a prismatic concrete structure in which the formwork device can be easily detached after placing the concrete.

The present invention has the following excellent effects.
(1) The mold apparatus is configured such that a pair of half mold frames formed along a substantially half circumferential surface of a prismatic concrete structure are coupled to each other by a fastening member at their joint ends. The half mold frame is fixed at predetermined intervals along the longitudinal direction to a mold frame having an inner circumferential surface corresponding to a substantially half circumferential surface of the outer circumferential surface of the prismatic concrete structure, and to the outer circumferential portion of the mold frame. A wooden support member, and a holding member fixed to the outer periphery of the wooden support member at an interval so as to be orthogonal to the longitudinal direction. The holding member includes a corner fixing guide at the intersection of the two beam members. The corner fixing guide is fixed to one end of one beam member and is formed to have a structure that slidably supports one end of the other beam member. At the end, the other end of one beam member can slide Since the supporting member for fixing at a later stage is provided, the holding member can correspond to a plurality of cross-sectional sizes of the prismatic concrete structure, so that one type of holding member can be used without preparing a plurality of holding members. Thus, it is possible to manufacture a formwork apparatus that can cope with a plurality of cross-sectional sizes. Further, it is possible to provide a formwork device for a prismatic concrete structure in which the formwork device can be easily detached after placing concrete.

(2) A long reinforcing member is disposed so as to abut on the outer surface of the holding member and to be orthogonal to the holding member, and a fastening means for fastening these reinforcing members to the inside is provided between the opposing reinforcing members. Thus, since the holding member is tightened inward by the reinforcing member, it is possible to reliably prevent the formwork from being expanded by the internal pressure of the placed concrete, and it is possible to form a concrete column having a predetermined dimension.

(3) Since the two beam members are each made of H-shaped steel, the formwork device has sufficient strength to withstand the pressure of the placed concrete, and has the cross-sectional size of the prismatic concrete. Changes can be easily followed.

(4) The corner fixing guide is provided with a fastening member that comes into contact with the other beam member to stop the relative movement between the corner fixing guide and the other beam member. It can be securely fixed via the corner fixing guide.

(5) The retrofitting fixing guide is detachably fixed to the other end of the other beam member by a fixing bolt, and is in contact with the other end of one of the beam members to be attached to the other end of the beam. By providing the tightening member for stopping the relative movement with the member, the pair of halved mold bodies can be easily joined at the joining end portion, and the pair of half-frames after joining can be joined. The joining end portion of the split mold frame can be reliably fixed.

(6) When constructing a prismatic concrete structure, on the ground, it is composed of a formwork, a wooden support material, a holding member, and a reinforcing member, and is formed so as to follow a substantially semicircular surface of the prismatic concrete structure. After forming a pair of split mold frames and joining a pair of half mold frames together with fastening members at their joint ends, form a mold apparatus corresponding to the outer peripheral surface of a prismatic concrete structure , Placed in the position of a prismatic concrete structure to be cast by lifting the formwork device upward, cast concrete in the formwork of the formwork device, and after the concrete has solidified, a pair of halves The formwork device is expanded by loosening the bonding of the frame bodies, and in this state, the formwork device is lifted from above, and the formwork device is detached from the outer peripheral surface of the prismatic concrete structure. A prismatic concrete that is cast It is formed in a formwork device corresponding to the outer peripheral surface of the structure, the formwork device is lifted upward and installed at the position of a prismatic concrete structure to be placed next, and the concrete is placed in the formwork device. By providing, it is possible to provide a construction method of a prismatic concrete structure that has good working efficiency and can shorten the construction period. In addition, it is possible to provide a method for constructing a prismatic concrete structure in which the formwork device can be easily detached after placing the concrete. Furthermore, a concrete pillar having a predetermined dimension can be formed.

It is a front view of the formwork apparatus for prismatic concrete structures based on the Example of this invention. It is a top view of the formwork apparatus for prismatic concrete structures based on the Example of this invention. It is a top view of the corner fixing guide vicinity in the formwork apparatus for prismatic concrete structures which concerns on the Example of this invention. It is AA sectional drawing of FIG. It is a top view of the vicinity of the guide for retrofitting in the formwork apparatus for prismatic concrete structures which concerns on the Example of this invention. It is BB sectional drawing of FIG. It is sectional drawing of the principal part explaining the support state of the holding member and reinforcement member which concern on the Example of this invention. It is a top view explaining the formwork apparatus in the case of applying to a prismatic concrete structure with a small cross-sectional size.

  EMBODIMENT OF THE INVENTION With reference to drawings, the form for implementing this invention is demonstrated illustratively based on an Example below. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

With reference to FIG. 1 thru | or FIG. 6, the formwork apparatus for prismatic concrete structures which concern on the Example of this invention, and the construction method using the same are demonstrated.
In the following examples, the case where the cross section, which is an example of a formwork device for a prismatic concrete structure, is a regular square will be described as an example, but the present invention is not limited to this and the cross section is not limited thereto. Any rectangular shape such as a rectangle, a rhombus, a saddle shape, or a trapezoid is applicable.

FIG. 1 is a front view showing a state in which a formwork device for a prismatic concrete structure according to an embodiment of the present invention is erected in a concrete placement state, and a prismatic concrete having a square cross section. A formwork apparatus 1 for constructing a structure includes a formwork 10. The form 10 will be described in detail later.
A plurality of wooden support members 11 are fixed with screws or the like at predetermined intervals along the vertical direction of the outer peripheral portion of the mold 10 to support the mold 10 so that it does not bulge outward due to the internal pressure of concrete. The wooden support member 11 is a truss member 13 arranged so as to form a truss in the longitudinal direction between two wooden corner members 12 and 12 extending in parallel at a predetermined interval. The truss structure is formed. The arrangement interval of the wooden support members 11 is determined by design. For example, when the cross section of the mold 10 has a size of 800 × 800 mm, four rows are provided at intervals of about 200 mm, and in the case of a size of 1300 × 1300 mm, about 200 mm. A total of 7 rows are provided, with 6 rows at intervals and one row at the center.

  A plurality of holding members 15 are fixed to the outer peripheral portion of the wooden support member 11 at intervals in the longitudinal direction of the mold 10 (up and down direction in the standing state). The vertical spacing of the holding members 15 is determined by design. For example, the lower part of the mold 10 is arranged at a small pitch, and as it goes upward, it is arranged at a gradually larger pitch. Is about 1200 mm. The holding member 15 will be described in detail later.

  In FIG. 1, a pair of suspension fittings 40, 40 are provided in parallel so as to penetrate the space of the truss member 13 of the left and right wooden support members 11. The suspension fitting 40 is formed of a pipe, and the wire 42 of the lifting device 41 is wound around when the formwork device 1 is lifted, and is provided relatively upward. In addition, one hanging bracket 43 is provided on one side surface near the lower end of the formwork device 1 so as to penetrate the space of the truss member 13 of the wooden support material 11, and is used when the formwork device 1 is caused. This point will be described in detail later.

  In addition, a pipe support 45 for pushing the formwork device and a chain for pulling the formwork device 1 between the base plate 44 and the formwork device 1 so that the formwork device 1 is correctly set up in the vertical direction. Two sets of 46 are mounted on two orthogonal surfaces, for example, the left side and the rear side (not shown) in FIG. A turnbuckle 47 is attached to the chain 46, and the length of the chain 46 can be adjusted.

Next, the mold apparatus 1, the mold 10, and the holding member 15 will be described with reference to FIGS.
As shown in FIG. 2, the formwork apparatus 1 is for constructing a prismatic concrete structure having a regular square cross section, for example, and is formed so as to follow a substantially half circumferential surface of the prismatic concrete structure. The halved mold bodies 2-1 and 2-2 are connected to each other at their joint ends C1 and C2 by fastening members. Specifically, the substantially half L-shaped half frame 2-1 has the same configuration as the other half L-shaped frame 2-2, and the other half-shaped frame 2-1 has the same configuration. The other half mold frame 2-2 is joined to the mold frame 2-1 by a fastening member at the joint ends C1 and C2 in a state rotated by 180 ° about the vertical axis O. Thus, for example, it is assembled as a prismatic concrete structure having a square cross section.
In the present specification, the term “substantially half-circumferential surface” includes a case where it is not manufactured on an accurate half-circumferential surface due to an error in manufacturing, and the term “substantially L-shaped” is 2 The case where the lengths of two sides are not equal and the case where the angle of intersection between the two sides is an angle other than 90 °, for example, a range of 60 ° to 120 ° are also included.

Here, of the two halved frames, one halved frame 2-1 will be described.
For example, in the case of a prismatic concrete structure having a regular quadrilateral cross section, the half mold frame 2-1 has a mold frame 10 having an inner peripheral surface corresponding to a substantially half peripheral surface of the outer peripheral surface, and an outer periphery of the mold frame 10. And a holding member 15 fixed to the outer peripheral portion of the wooden support 11 at an interval so as to be orthogonal to the longitudinal direction.

  For example, a mold 10 having an inner peripheral surface corresponding to a substantially half peripheral surface of an outer peripheral surface of a concrete structure having a regular square cross section has two pieces corresponding to two of the outer peripheral surfaces of a regular square of a prismatic concrete structure. The wood plywood is assembled in a substantially L shape, and each piece is made of two laminated wood plywoods with a thickness of 12 mm, and has rigidity and durability. At that time, even when the inner surface of the mold 10 is damaged by the concrete placement, it can be easily repaired by replacing only the wooden plywood inside the two laminated wooden plywood. About the up-down direction of the formwork 10, for example, the existing wooden plywood with a length of 1800 mm is connected and formed in a required length. In the joining of wooden plywood, the leakage of concrete can be prevented and the quality of the cast concrete can be improved by shifting the joint between the inner plywood and the outer plywood.

In the holding member 15, two beam members 16 and 17 are fixed via a corner fixing guide 18 at, for example, an intersecting portion orthogonal to each other. In this example, linear H-shaped steel is used for the beam members 16 and 17, but the present invention is not limited to this, and may be other steel shapes such as channel members or pipes. Further, in this example, the H-shaped steel is disposed so that the flange portion thereof faces in the vertical direction and the web portion faces in the horizontal direction.
The corner fixing guide 18 is fixed to one end of one beam member 16 and has a structure that supports one end of the other beam member 17 so as to be slidable.
The two beam members 16 and 17 are prepared with a length corresponding to the maximum cross-sectional dimension of the cast prismatic concrete, and when the cast prismatic concrete has a small cross-sectional dimension, a corner fixing guide Correspondingly, the amount of protrusion of the other beam member 17 inserted into 18 is increased. This point will be described in detail later.

An example of the corner fixing guide 18 in this example will be described in detail with reference to FIGS. 3 and 4.
As shown in FIG. 4, the corner fixing guide 18 in this example has a box shape in which four flat plates 18 a to 18 d are coupled in a box shape, and two side surfaces are opened. The other beam member 17 is inserted so as to penetrate. At the same time, the flat plate 18d forming the inner side surface of the corner fixing guide 18 is fixed to one end of one beam member 16 by means such as welding. Further, in order to fix the corner fixing guide 18 to the one beam member 16 at an accurate angle, it is between the inner end face of the one beam member 16 and the extension 18de of the flat plate 18d of the corner fixing guide 18. A substantially triangular angle fixing plate 19 is disposed and fixed to the inner end face of the beam member 16 and the inner side of the extension portion 18de by means such as welding.

Further, as shown in FIG. 4, when the other beam member 17 is inserted into the corner fixing guide 18, the inner surface 17 a of the other beam member 17 comes into contact with the inner surface of the flat plate 18 d of the corner fixing guide 18. In order to facilitate the insertion of the other beam member 17, the inner surface dimension of the corner fixing guide 18 is set slightly larger than the outer dimension of the other beam member 17.
Further, the corner fixing guide 18 is provided with a tightening member 20 for contacting the side surface of the other beam member 17 and stopping the relative movement between the corner fixing guide 18 and the other beam member 17. In this example, the fastening member 20 is a bolt 20a and a nut 20b. The bolt 20a is screwed into a female screw hole 21 provided in the corner fixing guide 18, and prevents loosening in cooperation with the nut 20b. It can be done. A plurality of fastening members 20 are provided in the corner fixing guide 18 along the longitudinal direction of the other beam member 17.
Further, in order to facilitate the insertion of the other beam member 17 into the corner fixing guide 18, the rectangular guide members 22 are provided above and below the corner fixing guide 18 so as to sandwich the web portion 17 b of the beam member 17.
In FIG. 2, the other beam member 17 is slidable in the Y direction with respect to the corner fixing guide 18, and can cope with a dimensional change in the Y direction.

  As shown in FIGS. 2 and 3, the end of the other beam member 17 is attached with a drop prevention member 23 made of a bolt and a nut, and the other beam member 17 is inadvertently connected to the corner fixing guide 18. It is designed to prevent it from falling off.

Next, an example of the retrofitting fixing guide 25 in this example will be described in detail with reference to FIGS. 5 and 6.
The retrofitting fixing guide 25 in this example is detachably fixed to an end portion 17c on the opposite side to the end portion on which the corner fixing guide 18 of the other beam member 17 is mounted. The upper plate 25a The bottom plate 25b and the side plate 25c are substantially U-shaped.
As shown in FIG. 6, the rear fixing guide 25 extends so that the upper plate 25a and the bottom plate 25b overlap the end portion 17c of the other beam member 17 on the substantially U-shaped opening side. The portion 25d is detachably fixed to the end portion 17c of the other beam member 17 by a fixing means 26 comprising a fixing through bolt. In this example, the other beam member 17 is made of H-shaped steel, and overlaps so that the upper plate 25a and the bottom plate 25b of the rear fixing guide 25 abut on the upper and lower end surfaces of the flange portions 17f and 17f from the outside. Then, the plurality of fixing through bolts 26, 26 are mounted so as to penetrate the web portion 17w of the H-shaped steel, so that the retrofit fixing guide 25 is detachably attached to the end portion 17c of the other beam member 17. It is fixed.
In order to facilitate the insertion of one beam member 16 into the retrofit fixing guide 25, a widening means for slightly increasing the inner surface dimension of the retrofit fixing guide 25 is provided at the end of the other beam member 17. It is desirable to provide in 17c. As this widening means, for example, it is one idea to provide a width determining member 36 in the vicinity of the fixing means 26 that protrudes slightly outward from the upper and lower end faces of the flange portions 17f, 17f.

The corner fixing guide 18 of one beam member 16 of the other half-shaped frame body 2-2 is fixed to the substantially U-shaped postfix fixing guide 25 so as to be orthogonal to the other beam member 17. It is slidably inserted into the end opposite to the end. Thereby, it can respond to the dimensional change of the X direction of one half mold 2-1 and the other half mold 2-2.
When the end of one beam member 16 of the other half mold frame 2-2 is inserted into the rear fixing guide 25 of the other half mold frame 2-1, the other half mold frame The inner side surface of one beam member 16 of 2-2 is set so as to come into contact with the distal end surface 17d of the other beam member 17 of one half mold frame 2-1.
The rear fixing guide 25 is in contact with the outer side surface of one beam member 16 of the other half-shaped frame 2-2 so as to contact the rear fixing guide 25 and the other half-shaped frame 2. -2 is provided with a tightening member 27 for stopping relative movement with the one beam member 16. In this example, the tightening member 27 includes a bolt 27a and a nut 27b, and the bolt 27a is screwed into a female screw hole 28 provided in the side plate 25c of the rear fixing guide 25, and cooperates with the nut 27b. The slack can be prevented.

  As shown in FIGS. 2 and 5, a drop-off prevention member 29 made of a bolt and a nut is attached to the end of the beam member 16 on the side to be inserted into the retrofitting fixing guide 25. In addition, one beam member 16 is prevented from falling off from the retrofitting fixing guide 25.

Next, after one half mold frame 2-1 and the other half mold frame 2-2 are joined to form a regular quadrilateral mold frame 1, the mold frame 1 is A means for tightening so as not to loosen will be described.
As shown in FIG. 2, a pair of tie rods parallel to the mold 10 so as to pass through the space of the truss member 13 of the left and right wooden support members 11 between the pair of opposed beam members 16 and 16. 30-1 and 30-2 are mounted. Also, a pair of tie rods 30-3, 30 parallel to the mold 10 so as to pass through the space of the truss member 13 of the front and rear wooden support members 11 between the pair of beam members 17 and 17 facing each other. -4 is mounted. At a position where these tie rods 30-1, 30-2, 30-3, and 30-4 are mounted, a direction that is in contact with the outer surface of the holding member 15 and perpendicular to the holding member 15 (longitudinal direction of the mold 10. A long reinforcing member 32 is disposed in the longitudinal direction when it is provided. The tie rods 30-1, 30-2, 30-3 and 30-4 have the same structure, and each of the tie rod main body 31 and the reinforcing member 32 mounted so as to pass through the holes formed in the reinforcing member 32. The wing nut 33 is attached to the outside, the washer 34 is attached to the inside of the reinforcing member 32, and the wing nut 35. The tie rod body 31 is formed with a threaded portion over its entire length.

Here, the reinforcing member 32 will be described in detail.
As shown in FIGS. 1 and 2, the reinforcing members 32 are disposed on both sides of each corner corresponding to the mounting positions of the tie rods 30-1, 30-2, 30-3, 30-4. A total of eight members are arranged in the longitudinal direction from the lowermost holding member 15 to the uppermost holding member 15, and a pair of opposing reinforcing members 32, 32 are respectively connected to tie rods 30-1, 30-2, All the holding members 15 are tightened from the outside toward the inside by being tightened by 30-3 and 30-4. By tightening the holding member 15 by the reinforcing member 32, the expansion of the mold 10 is prevented against the internal pressure of the placed concrete, and a concrete column having a predetermined size is formed. The reinforcing member 32 preferably has a shape that makes contact with the beam members 16 and 17 on the surface, for example, a square shape in cross section, and is preferably a square pipe or the like.

Next, the supporting state of the beam members 16 and 17 constituting the holding member 15 and the reinforcing member 32 will be described with reference to FIG. FIG. 7 shows a state in which the mold apparatus 1 is laid down on an assembly stand, and the reinforcing member 32 is shown in parallel with the paper surface.
A substantially crank-shaped locking member 37 is welded to the reinforcing member 32 in accordance with the installation interval of the beam members 16 or 17, and the tip locking portion 37 a of the locking member 37 is a flange portion of the beam members 16 and 17. It can be fitted from one side. In a state where the front end locking portion 37a of the locking member 37 is fitted to one side of the flange portion of the beam member 16 or 17, the front end locking portion 38a of the rear mounting locking member 38 is the flange of the beam members 16 and 17. It is fitted to the other side of the part. The retrofitting locking member 38 is fixed to the reinforcing member 32 by a fixing means 39 such as a bolt. Thus, the reinforcing member 32 is fixed to the beam member 16 or 17 via the locking member 37 and the locking member 38.
The retrofitting locking members 38 and fixing means 39 do not have to be provided corresponding to all the beam members 16 or 17, and are provided every other in FIG.
Further, the tie rods 30-1, 30-2, 30-3, 30-4 are arranged in the vicinity of the beam member 16 or 17, for example, above or below in the standing state, but not all the beams. It does not have to be provided corresponding to the member 16 or 17.

Next, the half mold frames 2-1 and 2-2 constituting the mold apparatus 1 are manufactured, and then a pair of half mold frames 2-1 and 2-2 are assembled, and the cross section is A procedure for obtaining the formwork apparatus 1 for constructing a regular rectangular prismatic concrete structure will be described in order.
[Production of halved mold body 2-1]
(1) The two beam members 16 and 17 are fixed by a corner fixing guide 18 at an intersecting portion orthogonal to each other to form a half-holding member 15. At that time, the corner fixing guide 18 is fixed to one end of one beam member 16 by means of welding or the like, and the other beam member 17 is inserted into the corner fixing guide 18 and fixed at a predetermined position in the Y direction. The relative movement between the guide 18 and the other beam member 17 is stopped by the fastening member 20, and the two beam members 16 and 17 are fixed.
(2) After the two beam members 16 and 17 are fixed, the beam member 17 is placed on a dedicated assembly base (not shown), and the corner fixing guide 18 is placed on the right side and placed in an inverted L shape. And temporarily hold it.
(3) The wooden support 11 is fixed to the inner peripheral surfaces of the two beam members 16 and 17 by using a fixture called a hook strap (not shown). In the case of this example, the hook strap is attached to each truss member 13, and the H-shaped steel 16 or 17 that is the beam member is attached to the truss member 13 by sandwiching the flange portion of the H-shaped steel 16 or 17 that is the beam member. It is to be fixed. The interval between the wooden support members 11 is determined by design.
(4) Two wooden plywoods are assembled in a substantially L shape on the inner peripheral surface of the wooden support material 11 to form a mold 10 having a substantially L-shaped cross section. Each piece of the mold 10 has, for example, two laminated wood plywoods with a thickness of 12 mm, and has rigidity, durability, and winter heat retention. Two wooden plywoods are fixed with nails. Moreover, about the length of the formwork 10, for example, the existing wood plywood with a length of 1800 mm is connected and formed in a required length.
(5) A drop prevention member 23 made of a bolt or the like is attached to the end of the other beam member 17 to prevent the other beam member 17 from dropping from the corner fixing guide 18.

[Assembly of a pair of half-die frames 2-1 and 2-2]
(1) In accordance with the above procedure, two half mold frames are manufactured, one is a half mold frame 2-1, the other is a half mold frame 2-2, and the other half mold frame is 2-2 is rotated by 180 °, and one side is opposed to the half-shaped frame body 2-1, and at the joint ends C1 and C2 of both, the inner side surface of one beam member 16 and the other beam member 17 Contact the end.
(2) Two retrofit fixing guides 25 are fixed by the corner fixing guides 18 of one beam member 16 in one half-type frame 2-1 and the other half-type frame 2-2, respectively. It is inserted so as to slide to the end opposite to the end to be fixed, and fixed to the end 17 c of the other beam member 17 by a fixing means comprising a fixing bolt 26.
(3) The fastening member 27 provided on the side plate 25c of the retrofit fixing guide 25 is tightened to attach the retrofit fixing guide 25, the half mold frame 2-1, and the other half mold frame 2-2. The one beam member 16 is fixed.
(4) A drop prevention member 28 made of a bolt or the like is attached to the end of one beam member 16 to prevent the one beam member 16 from being accidentally dropped from the retrofitting fixing guide 25.
(5) Corresponding to the positions of the truss members 13 on both sides of each corner, contact the outer surface of the beam members 16, 16 and 17, 17 and make the long reinforcing member 32 perpendicular to the beam members 16, 17 (longitudinal Direction). Next, a pair of tie rods 30-1 and 30-2 are mounted between the pair of reinforcing members 32 and 32 mounted on the outer surfaces of the opposed beam members 16 and 16. A pair of tie rods 30-3 and 30-4 are attached between the pair of reinforcing members 32 and 32 attached to the outer surface. Each of the wing nuts 33 attached to the outsides of the tie rods 30-1, 30-2, 30-3, and 30-4 is tightened, and the pair of half-shaped frame bodies 2-1 and 2-2 are formed by the reinforcing member 32. Securely fix.
Note that the wing nut 35 attached to the inside of the tie rods 30-1, 30-2, 30-3, 30-4 is left free.
(6) By assembling the pair of halved mold bodies 2-1 and 2-2, the mold apparatus 1 for constructing a prismatic concrete structure having a regular square cross section is obtained.

Next, a procedure from transporting the formwork apparatus 1 to the construction position of the concrete structure, setting it, placing concrete, extracting the formwork apparatus 1 and transporting it to the construction position of the next concrete structure will be described. .
(1) The wire of the crane for raising is hung on the uppermost beam member of the formwork apparatus 1 assembled so as to lie on the ground, and the wire is also hung on the hanging metal fitting 43 near the lower end of the formwork apparatus 1, The length of the wound wire is adjusted to cause the formwork device 1 to rotate 90 ° and cause it.
(2) The wire 42 of the lifting device 41 is wound around the hanging metal fitting 40 of the formwork device 1, and the formwork device 1 is lifted upward and installed at the position of a prismatic concrete structure to be placed.
(3) Placing concrete in the mold 10.
(4) After the concrete has solidified, loosen the connection between the pair of halved molds 2-1 and 2-2.
Specifically, first, the wing nuts 33 of the tie rods 30-1, 30-2, 30-3, and 30-4 are loosened, and then the fastening member 27 of the retrofit fixing guide 25 is loosened. Then, in the X direction, one of the beam members 16, 16 and the retrofit fixing guides 25, 25 slide, and the tightening member 27 of the retrofit fixing guide 25 is pulled outward. For example, in this example, the length of 20 mm and one beam member 16, 16 moves in the Y direction. In this state, since the binding force between one half mold frame 2-1 and the other half mold frame 2-2 is released, the mold 10 of one half mold frame 2-1 The mold 10 of the other half mold body 2-2 is separated from the concrete. If necessary, the wing nut 35 attached to the inside of the tie rods 30-1, 30-2, 30-3, and 30-4 is operated to bias the beam members 16 and 17 outward.
In this state, the mold apparatus 1 is expanded in diameter, but the engagement between the beam members 16 and 17 is maintained by the drop-off preventing members 23 and 28, so that the pair of halved mold bodies 2 -1 and 2-2 are in an engaged state.
(5) The formwork apparatus 1 in an expanded state is lifted by a lifting device 41, extracted from a prismatic concrete structure, and temporarily placed on a dedicated stand. (6) On the dedicated mount, the pair of halved mold bodies 2-1 and 2-2 are restored to the original state.
(7) Forming device 1 Lifted by the lifting device 41 and installed at the position of the next prismatic concrete structure to be placed.

Next, the formwork apparatus in the case of applying to a prismatic concrete structure having a small cross-sectional size will be described with reference to FIG.
Regardless of the size of the cross section, the procedure for manufacturing the half mold body 2-1 and assembling the pair of half mold bodies 2-1 and 2-2 is basically the same, so a detailed explanation will be given. Although omitted, when the cross-sectional size is small, the following points are mainly different.
(1) The two beam members 16 and 17 are fixed by the corner fixing guide 18 at the intersecting portion to form the half holding member 15, but the projection of the beam member 17 protruding from the corner fixing guide 18 The length increases.
(2) The wooden support member 11 is fixed to the inner peripheral surfaces of the two beam members 16 and 17, and the two wooden plywoods are assembled to the inner peripheral surface of the wooden support member 11 so as to have a substantially L-shaped cross section. Although the mold 10 is formed, the cross-sectional sizes of the wooden support 11 and the mold 10 are small.
(3) When assembling the pair of half-shaped frame members 2-1 and 2-2, insert the two retrofitting fixing guides 25 so as to slide to the end of one beam member 16, and tighten them. The attachment member 27 is tightened to fix the postfix fixing guide 25 and the one beam member 16, but the protruding length of the beam member 16 protruding from the retrofit fixing guide 25 is increased.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the said Example, although the formwork apparatus 1 demonstrated the case where the cross-sectional shape of a concrete structure was a regular square, it is not limited to this, The cross-sectional shape of a concrete structure is a square, a rhombus, a saddle type It can also be applied to trapezoids.

  For example, in the above-described embodiment, the case where the beam members 16 and 17 are made of H-shaped steel has been described. However, the present invention is not limited to this, and the beam members 16 and 17 may be formed of other steel shapes or pipes. In that case, it goes without saying that the corner fixing guide 18 and the retrofitting fixing guide 25 are also made in accordance with other shapes such as steel.

  Further, for example, in the above embodiment, it has been described that a pair of tie rods are mounted between the pair of reinforcing members 32 and 32 and the pair of reinforcing members 32 and 32 are tightened. The fastening means 32 and 32 are not limited to tie rods, and may be fastened with a turnbuckle, for example.

DESCRIPTION OF SYMBOLS 1 Formwork apparatus 2-1 One half mold frame 2-2 The other half mold frame 10 Mold frame 11 Wooden support material 12 Wooden square material 13 Truss material
DESCRIPTION OF SYMBOLS 15 Holding member 16 One beam member 17 The other beam member 18 Corner fixing guide 19 Angle fixing plate 20 Tightening member (bolt 20a and nut 20b)
21 Female screw hole 22 Guide material 23 Fall-off prevention member (bolt and nut)
25 Retrofit Fixing Guide 26 Fixing means (fixing through bolt)
27 Tightening member (bolt 27a and nut 27b)
28 Female threaded holes 29 Fall-off prevention members (bolts and nuts)
30-1 to 30-4 Tie rod (tightening means)
31 Tie rod body 32 Reinforcement member 33 Wing nut 34 Washer 35 Wing nut 36 Width determining material 37, 38 Locking member 39 Fixing means 40 Lifting bracket 41 Lifting device 42 Wire 43 Lifting bracket 44 Base plate 45 Pipe support 46 Chain 47 Turnbuckle O Vertical Axis C1, C2 Joint end

Claims (6)

A formwork apparatus for constructing a prismatic concrete structure, wherein the formwork apparatus includes halved formwork bodies formed so as to extend along a substantially half circumferential surface of the prismatic concrete structure. It is comprised so that it may couple | bond with a fastening member in a joining end part, and the said half mold frame body has the inner peripheral surface corresponding to the substantially half peripheral surface of the outer peripheral surface of the said prismatic concrete structure, A wooden support member fixed to the outer periphery of the mold frame at a predetermined interval along the longitudinal direction, and a holding member fixed to the outer periphery of the wooden support member at an interval so as to be orthogonal to the longitudinal direction ,
In the holding member, two beam members are fixed at a crossing portion via a corner fixing guide, and the corner fixing guide is fixed to one end of one beam member, and the other beam member is fixed. The other end of the other beam member is provided with a slidable support guide for slidably supporting the other end of the one beam member. Formwork equipment for prismatic concrete structures.   A long reinforcing member is disposed so as to be in contact with the outer surface of the holding member and orthogonal to the holding member, and between the opposing reinforcing members, a tightening means for fastening these reinforcing members to the inside is provided. The formwork apparatus for prismatic concrete structures of Claim 1 characterized by these.   3. The formwork device for a prismatic concrete structure according to claim 1 or 2, wherein each of the two beam members is made of H-shaped steel.   The corner fixing guide is provided with a clamping member for contacting the other beam member to stop relative movement between the corner fixing guide and the other beam member. The formwork apparatus for prismatic concrete structures of any one of 1-3.   The retrofit fixing guide is detachably fixed to the other end of the other beam member by a fixing bolt, and is in contact with the other end of the one beam member so as to be in contact with the one of the retrofit fixing guide and the one The formwork device for a prismatic concrete structure according to any one of claims 1 to 4, wherein a fastening member for stopping relative movement with the beam member is provided. When building a prismatic concrete structure, a half formwork is formed on the ground, consisting of a formwork, a wooden support material, a holding member, and a reinforcing member, along the substantially half circumferential surface of the prismatic concrete structure A pair of halves, and the pair of halved molds are joined to each other by a fastening member at a joint end thereof to form a formwork device corresponding to the outer peripheral surface of the prismatic concrete structure; The formwork apparatus is installed at the position of a prismatic concrete structure to be casted upward, the concrete is placed in the formwork of the formwork apparatus, and after the concrete is solidified, the pair of halves The formwork device is expanded by loosening the bond of the formwork body, and the formwork device is lifted from above in that state, the formwork device is detached from the outer peripheral surface of the prismatic concrete structure, Again, then nailed Formed in a formwork device corresponding to the outer peripheral surface of the prismatic concrete structure, and is placed at the position of the prismatic concrete structure to be placed next after lifting the formwork device, A method for constructing a prismatic concrete structure, characterized by placing concrete in an apparatus.

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