JP7090781B1 - Formwork structure of concrete prism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a formwork structure capable of firmly holding the angle of a corner portion by firmly binding the lateral flap members facing each other across the corner portion even when the cross section of the pillar is a non-right angle quadrilateral. offer. SOLUTION: A flat foam 2 for molding a side surface of a prism and a corner foam 30 for molding a corner are connected to surround a molding position of the prism. The corner foam 30 is formed so that the curvature or bending angle of the corner portion can be changed. The lateral flap members 41 attached to the outside of each flat foam 2 and facing each other across the corner are first between the locking bent portions 51 of the corner tightening receiver 5 attached to the outer surface near the corner. By inserting the tie bolt 52 and fastening the nut, and inserting the second tie bolt 62 between the receiving pieces 61 of the corner restraint bracket 6 attached to the end and fastening the nut, the lateral flap members 41 are connected to each other. The points are double-tightened inside and outside along the direction in which the points intersect the angle bisector of the corner. [Selection diagram] FIG. 4

Description

The present application relates to a formwork structure of a concrete pillar, and more particularly to a formwork structure of a concrete pillar in which the corners of the cross-sectional shape are non-right angles.

A construction method using a metal formwork (metal foam) for constructing a concrete structure is known. The applicant has also put into practical use the formwork structure and construction method disclosed in Non-Patent Document 1 as a formwork structure suitable for constructing a concrete pillar body having a large cross section that supports a viaduct of a railway or a road.

As shown in FIGS. 5 and 6, the formwork structure includes a flat foam 2 for molding the side surface of a concrete pillar body (hereinafter, simply referred to as “pillar body”) 1 having a rectangular cross section, and corners. It is configured by combining a corner foam 3 for molding and a fastening member or the like that connects and fastens them from the outside.

The flat foam 2 is a panel-shaped member in which a plurality of vertical ribs 22 and horizontal ribs 23 are connected in a grid pattern on the back surface of a rectangular face plate 21 having a flat surface. The vertical ribs 22 and the horizontal ribs 23 are formed with a large number of holes 24 for inserting members (bolts, clips, pins, etc.) that connect adjacent flat foams 2 and 2.

The corner foam 3 is formed so that two adjacent flat foams 2 and 2 can be connected at a right angle in a plan view. The illustrated corner foam 3 has a protruding corner face plate 31 whose corners are chamfered at 45 degrees. On the back surface of the protruding corner surface plate 31, vertical ribs 32 that are orthogonal to each other in a plan view and horizontal ribs 33 that connect the vertical ribs 32 and 32 in an orthogonal state are provided, and the vertical ribs 32 and 32 are flat foams. It is connected to the vertical rib 22 on the side edge of No. 2 by using bolts, nuts (not shown) or the like.

As the fastening member, steel flutter (thick end) in which two channel steels are joined together with a predetermined gap is used for both the horizontal flutter material 41 and the vertical flutter material 42. The outer circumferences of the flat foam 2 and the corner foam 3 built so as to surround the molding position of the pillar 1 are tightened with a horizontal flap material 41 connected in a closed ring shape, and a vertical flap material 42 is further attached to the outside thereof to form the entire formwork. It is common to keep the "building" of.

In the construction method disclosed in Non-Patent Document 1, the flat foams 2 and 2 that form the adjacent two side surfaces of the pillar 1 and the two corner foams 3 and 3 that connect them are viewed in a plan view at the groundwork stage. Connected in an L shape, a horizontal flapping material 41 and a vertical flapping material 42 are also attached to the back surface of each flat foam 2, and two sets of the L-shaped frames are lifted by a crane to enclose the molding position of the pillar 1. After building in this way, the side edges of the opposing L-shaped frames are connected to each other. In this construction method, the angles of the corners are fixed at right angles by connecting the ends of the horizontal flaps 41 attached to the outside of the L-shaped frame via the corner connecting plate 43.

Further, the side edges of the L-shaped frame built so as to surround the molding position of the pillar 1 have a chevron-shaped locking bent portion near the ends of the lateral flap members 41 and 41 facing each other with the corners sandwiched between them. By attaching the corner tightening receivers 5 having 51 and inserting the tie bolts 52 between the corner tightening receivers 5 and 5 and fastening the nuts 56, the two sets of L-shaped frames are connected to each other as pillars. It is tightly connected to the side surface of No. 1 in the crossing direction of about 45 degrees in a plan view. As a result, it is possible to efficiently construct a prism 1 having a large cross section having excellent dimensional accuracy and finishing accuracy. A formwork structure similar to this is also disclosed in Patent Document 1, for example.

Japanese Patent Application Laid-Open No. 2003-278384

Nextech Co., Ltd. website "Products handled | Benkei BENKEI (stainless pillar formwork)", [online], [Search on July 27, 3rd year of Reiwa], Internet <URL: https://www.nex-tech.jp /product/benkei.php ＞

In the viaduct 9 of a railroad or a road, as shown in FIG. 7, the cross-sectional shape of the pillar 10 erected at a place where the horizontal alignment curves may be designed to be a non-right angle quadrilateral. The angle of the corner of the quadrilateral is generally in the range of 80 to 100 degrees.

When it is attempted to construct such a pillar body 10 having non-right-angled corners by the conventional formwork structure, it is necessary to prepare in advance a corner foam 3 and a corner connecting plate 43 that match the angles of the corners. However, at a construction site where the angle of the corner changes little by little according to the curve, it is costly and inefficient to prepare various types of corner foam 3 and corner connecting plate 43 according to each angle. be.

Therefore, while giving some flexibility to the corner foam 3, the flat foams 2 and 2 connected by sandwiching the corner foam 3 are between the ends of the horizontal flap members 41 and 41 attached to the back surfaces of the corner foams 3, respectively. A formwork structure that adjusts the angles of the four corners (intersection angles of flat foams 2 and 2 that sandwich the corners) within a range of several degrees by changing the fastening condition of the tie bolts 52 that fasten the corners is studied. rice field. However, for example, when concrete is poured into a formwork having a rhombic cross-sectional shape, the entire formwork tends to be deformed into a square close to a circle due to the heavy pressure of the concrete. It was found that the deformation of the formwork cannot be completely prevented by simply fixing the angles of the four corners.

The invention disclosed in the present application has been made based on such findings, and even when the cross-sectional shape of the pillar is a non-right-angled quadrilateral, the lateral fluttering materials facing each other with the corners sandwiched are firmly tied together. An object of the present invention is to provide a formwork structure capable of appropriately holding the angle of a corner portion.

In order to achieve the above-mentioned object, the formwork structure of the concrete pillar body of the invention disclosed in the present application connects a flat foam for molding the side surface of the pillar body and a corner foam for molding the corner portion of the pillar body. A formwork structure of a concrete pillar that surrounds the molding position of the pillar and connects the horizontal butter materials attached to the outside of each flat foam to each other on the outside of the corner to tighten the flat foam and the outer periphery of the corner foam. In, each of the corner foams has a protruding corner face plate formed so that the corner portion is curved or bent to change the curvature or the bending angle, and a pair provided on the left and right side edges of the protruding corner face plate. The horizontal fluttering material is formed to have a length such that the horizontal fluttering materials attached to the flat foams connected via the corner foam do not interfere with each other on the outside of the corner. On the outer surface in the vicinity of the corners of each of the horizontal fluttering materials, a corner tightening receiver having a plan-viewing mountain-shaped locking bend having an insertion hole for the first tie bolt is attached to the corners. The first tie bolt is inserted between the locking bent portions facing each other and the nut is fastened from the outside of the locking bent portion, and the lateral flap is attached to the end of each lateral flap material. A corner restraint bracket with a receiving piece protruding outward from the outer surface of the material is attached, and a second tie bolt parallel to the first tie bolt is attached between the receiving pieces facing each other across a corner. Is inserted and nuts are fastened from both sides of the receiving piece, so that the connecting points of the horizontal flap members are double-tightened inside and outside along the direction intersecting the bisector of the angle of the corner. Adopt the basic configuration of.

According to this configuration, the connection points between the lateral flap members at the corners of the prism are double-tightened inside and outside via the first tie bolt and the second tie bolt, so that the flat foam sandwiching the corners. Both flat foams can be tightly constrained to the intersection even if the intersections are non-right angles.

In the formwork structure according to the basic configuration, the first tie bolt and the second tie bolt will be deformed in a direction in which the angle of the corner is expanded or contracted by the pressure of the concrete placed in the formwork. It is preferable that the tensile stress resisting the deformation is arranged so as to occur in either the first tie bolt or the second tie bolt.

Alternatively, the first tie bolt is placed at a position passing near the extension intersection of the inner surface of the flat foam sandwiching the corner, while the second tie bolt is placed on the back surface of the flat foam sandwiching the corner. It is preferable that the position is arranged so as to pass outside the extension crossing line.

With these additional configurations, it is possible to effectively obtain the internal and external double binding force by the first tie bolt and the second tie bolt.

Further, it is more preferable that the upper and lower edges of the corner foam are formed with lateral ribs having flexibility to the extent that the bending or bending of the protruding corner face plate is not hindered.

Further, the corner restraining bracket includes a base piece that is overlapped with the end surface of the lateral flap material and fastened with bolts and nuts, a receiving piece that extends diagonally outward from the outer edge of the base piece, and the base piece. And the insertion hole of the second tie bolt formed between the two stiffening ribs orthogonal to both of the receiving pieces and bonded to the two stiffening ribs and the two stiffening ribs in the receiving piece. And can be configured to include.

According to the formwork structure of the concrete pillar body constructed as described above, the ends of the lateral flaps facing each other across the corner are double-tied inside and outside by the first tie bolt and the second tie bolt. It is firmly restrained and it becomes easy to fine-tune the angle of the corner. Thus, it is possible to construct a prism whose corner angles are not right angles with high accuracy.

It is an overall perspective view which shows one Embodiment of the formwork structure which concerns on the invention disclosed in this application. It is a cross-sectional view of the formwork structure of FIG. 1 (a) an enlarged perspective view and (b) a partially disassembled perspective view of a corner portion in the formwork structure of FIGS. 1 and 2. It is an enlarged cross-sectional view of the corner part in the formwork structure of FIGS. 1 and 2. It is an overall perspective view which shows an example of the formwork structure which the applicant has conventionally carried out. It is a cross-sectional view of the formwork structure of FIG. It is a plan view and the vertical sectional view which shows the example which the prism which becomes the quadrilateral which the cross-sectional shape becomes a non-right angle is installed in the viaduct and the like.

Hereinafter, embodiments of the invention disclosed in the present application will be described with reference to the drawings. In the embodiments described below, the components common to the conventional formwork structures shown in FIGS. 5 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted. In addition, when explaining the relative positional relationship of parts / members and the direction in which force acts, the vertical direction is determined based on the state of being built in the molding position of the prism, and the central axis side of the prism is set. Is called "inside (inside)", and the formwork surrounding the pillar and its surroundings is called "outside (outside)". Further, unless otherwise specified, "diagonal" in the following description indicates a direction that intersects the side surface of the prism at approximately 45 degrees in the horizontal plane (cross section of the prism).

1 to 4 show embodiments of the invention disclosed in the present application. Similar to the conventional formwork structures shown in FIGS. 5 and 6, the formwork structure includes a flat foam 2 for molding the side surface of the pillar 10 and a corner foam 30 for molding the corners. It is configured by combining them with a fastening member or the like that connects them and tightens them from the outside.

The flat foam 2 is not particularly different from the conventional one, and is formed by connecting a plurality of vertical ribs 22 and horizontal ribs 23 to the back surface of a flat rectangular face plate 21. The vertical ribs 22 and the horizontal ribs 23 are formed with a large number of holes (not shown) for inserting members (bolts, clips, pins, etc.) that connect adjacent flat foams 2 and 2. That is, in this formwork structure, the conventional flat foam 2 can be used as it is.

Since this form structure is for molding a pillar body 10 having a non-right-angled quadrilateral such as a parallelogram or a rhombus in cross section, the corner foam 30 has the corners fixed at right angles as in the conventional case. It is not configured so that the angle of the corner can be slightly increased or decreased. That is, in the exemplary corner form 30, the projected corner surface plate 35 whose corner portion is curved in a substantially quarter arc shape in a plan view is provided on both left and right edges of the projected corner surface plate 35 and intersects at a right angle in a plan view. It has a pair of vertical ribs 32, 32, and is formed so that the crossing angle of the pair of vertical ribs 32, 32 can be changed in a range of approximately 80 degrees to 100 degrees by bending the protruding corner surface plate 35. ing. In order to connect the corner foams 30 vertically, horizontal ribs 36 having an arcuate shape in a plan view are formed on the upper and lower edges of the protruding corner face plate 35. The protruding corner face plates 36 are formed on the horizontal ribs 36. Flexibility is provided to such an extent that it does not interfere with the curvature of 35.

These flat foams 2 and corner foams 30 are alternately connected to surround the molding position of the pillar 10. The adjacent flat foam 2 and the corner foam 30 are connected by overlapping the vertical ribs 22 and 32 with each other and fastening them with bolts and nuts. When building the formwork, as in the past, the two flat foams 2 and 2 and the two corner foams 30 and 30 adjacent to them are connected in an L-shape in a plan view at the groundwork stage. Therefore, a construction method for building the L-shaped formwork can also be adopted.

As the horizontal flutter material 41 and the vertical flutter material 42 that press the back surface of the formwork, steel flutter in which two channel steels are joined together with a predetermined gap is used as in the conventional formwork structure. ing. The horizontal flutter material 41 and the vertical flutter material 42 are previously bonded to the back surface of the flat foam 2 by using a hook bolt, a square pipe washer, or the like (not shown).

The main part of the invention disclosed in the present application is a structure in which the lateral flap members 41 and 41 are connected to each other at four corners. The lateral flutter material 41 is formed to have a length such that the lateral flutter materials 41 and 41 attached to the flat foams 2 and 2 connected via the corner foam 30 do not interfere with each other on the outside of the corner. A corner tightening receiver 5 provided with a locking bent portion 51 having a chevron shape in a plan view is attached to the outer surface of the lateral flap member 41 near the corner portion. The corner tightening receiver 5 is the same as the conventional corner tightening receiver 5 shown in FIGS. 5 and 6, and the mounting base piece 53 protruding from both side edges of the locking bent portion 51 is provided. Bolts and nuts 54 are fastened and fixed to the flanges of channel steel constituting the lateral flap member 41.

An insertion hole (not shown) for the first tie bolt 52 is formed in the locking bent portion 51. The first tie bolt 52 is the same as the conventional tie bolt 52 shown in FIGS. 5 and 6, and passes through the gap between the two channel steels constituting the lateral flutter material 41, and each lateral flutter material 41, It is inserted between the corner tightening receivers 5 and 5 attached to the 41. When the washer 55 is attached to the extra length portion protruding outward from the locking bent portion 51 of each corner tightening receiver 5 and the nut 56 is fastened, the lateral flutter material 41 facing each other across the corner portion, The vicinity of the end portion of 41 is tightly connected in an oblique direction (direction substantially orthogonal to the bisector of the angle of the corner) with respect to the side surface of the pillar 10. By adjusting the fastening condition of the nut 56, the crossing angle of the flat foams 2 and 2 sandwiching the corner can be gradually expanded or contracted to match the angle of the design value.

As shown in FIG. 4, the first tie bolt 52 is arranged at a position passing near the extension intersection line X of the inner surface (side surface of the pillar 10) of the flat foams 2 and 2 sandwiching the corner portion. Therefore, basically, when the nut 56 is tightened, the angle of the corner portion is reduced, and when the nut 56 is loosened, the angle of the corner portion is increased. In other words, when the angle of the corner is to be increased by the deformation of the entire formwork, tensile stress is generated in the first tie bolt 52 at the corner to resist the deformation. However, when the angle of the corner is reduced, sufficient stress to resist the deformation is not generated in the first tie bolt 52 at the corner.

Therefore, in this formwork structure, a second tie bolt 62 is arranged further outside the corner portion, and a configuration is adopted in which the connecting points of the horizontal flap members 41 are double-tightened inside and outside. The second tie bolt 62 is inserted into the end portion of the lateral flap member 41 facing the corner portion with the corner portion interposed therebetween via the corner restraint bracket 6.

The corner restraint bracket 6 has a flat plate-shaped base piece 63 that substantially matches the shape of the end face of the lateral flap material 41, and a receiving piece 61 that extends diagonally from one side edge of the base piece 63. There is. The base piece 63 is attached to the end plate 44 fixed to the end face of the lateral flap material 41 by fastening a plurality of bolts and nuts 45. The receiving piece 61 extends obliquely outward at approximately 45 degrees (in the direction of substantially bisector of the angle of the corner) from the outer edge of the base piece 63. A pair of upper and lower stiffening ribs 64, 64 orthogonal to both the base piece 63 and the receiving piece 61 are integrally formed in the inner corner formed by the base piece 63 and the receiving piece 61, and they are integrally formed. An insertion hole (not shown) for the second tie bolt 62 is formed between the stiffening ribs 64 and 64.

A second tie bolt 62 is inserted between the receiving pieces 61 and 61 facing each other across the corner, and the extra length protruding outward from the receiving pieces 61 and 61 facing each other and the receiving pieces 61 and 61. When the nuts 65 and 66 are fastened to the portions, the vicinity of the ends of the lateral flap members 41 and 41 facing each other across the corner is substantially orthogonal to the bisector of the angle of the corner, that is, the first. It is tied in parallel with the tie bolt 52 of. By adjusting the fastening condition of the nuts 65 and 66 attached to the second tie bolt 62 so as not to change the crossing angle of the flat foam 2 held by the fastening of the first tie bolt 52, the flat foam 2 sandwiching the corner is sandwiched. You can solidify the crossing angle of.

As shown in FIG. 4, the second tie bolt 62 is arranged at a position passing outside the extension intersection line Y of the back surfaces (inner surfaces of the lateral flap members 41 and 41) of the flat foams 2 and 2 sandwiching the corner portion. ing. In this arrangement, when the nuts 65 and 65 between the two receiving pieces 61 and 61 are loosened and the outer (extra length side) nuts 66 and 66 are tightened, the both receiving pieces 61 and 61 approach each other and form a flat foam. The intersection angle of 2 and 2 expands. On the contrary, when the nuts 66 and 66 on the outer sides of the receiving pieces 61 and 61 are loosened and the nuts 65 and 65 in between are tightened, the receiving pieces 61 and 61 are separated from each other and the crossing angle of the flat foam 2 is reduced. do. Therefore, when the angle of the corner is to be increased by the deformation of the entire formwork, compressive stress is generated in the second tie bolt 62 at the corner to resist the deformation. On the contrary, for the deformation in which the angle of the corner is to be reduced, a tensile stress is generated in the second tie bolt 62 to resist the deformation.

In this way, the corners are firmly restrained by firmly binding the ends of the lateral flap members 41, 41 facing each other across the corner with the first tie bolt 52 and the second tie bolt 62. Therefore, it is possible to reasonably prevent the deformation of the formwork that tries to increase or decrease the angle of the corner portion. Further, by adjusting the fastening condition of the nut 56 mounted on the first tie bolt 52 and the nuts 65 and 66 mounted on the second tie bolt 62, fine adjustment of the angle of the corner portion becomes easy. By adopting this formwork structure, it is possible to accurately build and firmly hold the formwork of the pillar 10 whose corner angles are not right angles.

The technical scope of the invention disclosed in the present application should not be construed in a limited manner by the illustrated embodiment, but should be conceptually construed based on the description of the scope of claims. In carrying out the invention disclosed in the present application, the shape, structure, material, quantity, joining form, relative positional relationship, etc. of the components which are not specifically specified in the claims are substantially described as the exemplary form. It can be appropriately modified as long as the same or higher effects can be obtained.

For example, in the corner foam 30, the corner portion of the protruding corner face plate 35 may be chamfered diagonally. Further, it is also preferable that the lateral ribs 36 formed on the upper and lower edges of the protruding corner surface plate 35 are formed with cuts or fragile portions that facilitate bending or bending of the protruding corner surface plate 35. As the horizontal flap material 41, for example, a square steel pipe or a laminated steel material in which two square steel pipes are joined with a predetermined gap can be used. Further, the corner tightening receiver 5 and the corner restraint bracket 6 are detailed as long as they can be firmly fixed to the lateral flap material 41 and the binding force of the tie bolts 52 and 62 can be sufficiently exerted. The shape and the mounting means to the lateral flap material 41 can be changed. Further, the corner tightening receiver 5 and the corner restraint bracket 6 may be integrally formed as one metal fitting. Furthermore, even for a prism whose cross-sectional shape is a polygon with a pentagon or more, the corners can be tied by changing the basic shape of the corner foam 30 (standard bending / bending angle of the protruding corner face plate 35). Can be applied to.

The invention disclosed in the present application can be used as a formwork structure of a concrete pillar whose cross-sectional shape is a quadrilateral having at least two corners non-right angles, or a polygon having a pentagon or more.

10 Pillar 2 Flat foam 21 Face plate 22 Vertical rib 23 Horizontal rib 24 Hole 30 Corner foam 31 Outer corner face plate 32 Vertical rib 33 Horizontal rib 35 Outer corner face plate 36 Horizontal rib 41 Horizontal flutter 42 Vertical flutter 43 Corner connecting plate 44 End plate 5 Corner tightening receiver 51 Locking bend 52 Tie bolt (first tie bolt)
53 Mounting base piece 54 Bolt / Nut 55 Washer 56 Nut 6 Corner restraint bracket 61 Receiving piece 62 Second tie bolt 63 Base piece 64 Stiffening rib 65 Nut 66 Nut

Claims (5)

The flat foam that molds the side surface of the pillar and the corner foam that molds the corner of the pillar are connected to surround the molding position of the pillar, and the horizontal flaps attached to the outside of each flat foam are cornered with each other. In the formwork structure of a concrete pillar that is connected to each other on the outside of the portion and tightens the outer periphery of the flat foam and the corner foam.
Each of the corner foams has a protruding corner face plate formed so that the corner portion is curved or bent to change the curvature or the bending angle, and a pair of vertical edges provided on the left and right side edges of the protruding corner face plate. With ribs,
The lateral flutter material is formed to a length such that the horizontal flutter materials attached to the flat foams connected via the corner foam do not interfere with each other on the outside of the corner.
On the outer surface near the corners of each lateral flap material, a corner tightening receiver having a plan-viewing mountain-shaped locking bend having an insertion hole for the first tie bolt is attached to sandwich the corner. The first tie bolt is inserted between the opposing locking bent portions, and the nut is fastened from the outside of the locking bent portions.
A corner restraint bracket having a receiving piece projecting outward from the outer surface of the horizontal fluttering material is attached to the end of each lateral fluttering material, and between the receiving pieces facing each other across the corner. A second tie bolt is inserted in parallel with the first tie bolt and nuts are fastened from both sides of the receiving piece.
A formwork structure of a concrete pillar, characterized in that the connection points between the horizontal flapping materials are double-tightened inside and outside along the direction intersecting the bisector of the angle of the corner. In the formwork structure of the concrete prism according to claim 1,
When the first tie bolt and the second tie bolt try to deform in a direction in which the angle of the corner is expanded or contracted by the pressure of the concrete placed in the formwork, the tensile stress resisting the deformation is applied. A formwork structure of a concrete pillar, characterized in that it is arranged so as to occur in either the first tie bolt or the second tie bolt. In the formwork structure of the concrete prism according to claim 1 or 2.
While the first tie bolt is placed at a position passing near the extension intersection of the inner surface of the flat foam sandwiching the corner, the first tie bolt is arranged.
The formwork structure of a concrete pillar is characterized in that the second tie bolt is arranged at a position passing outside the extension intersection line on the back surface of the flat foam sandwiching a corner portion. In the formwork structure of the concrete prism according to claim 1, 2 or 3.
A formwork structure of a concrete pillar, characterized in that horizontal ribs having flexibility not to hinder the bending or bending of the protruding corner face plate are formed on the upper and lower edges of the corner foam. In the formwork structure of the concrete pillar according to any one of claims 1 to 4.
The corner restraining bracket includes a base piece that is overlapped with the end face of the lateral flap material and fastened with bolts and nuts, a receiving piece that extends diagonally outward from the outer edge of the base piece, and the base piece and the said. Two stiffening ribs orthogonal to both sides of the receiving piece and coupled to both, and a second tie bolt insertion hole formed between the two stiffening ribs in the receiving piece, Formwork structure of concrete pillars characterized by being equipped with.

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