JP6437871B2 - Hollow frame body for frame - Google Patents

Description

  The present invention relates to a hollow frame body for a frame used for a frame of an agricultural greenhouse, a large tent, and the like. The present invention relates to a hollow frame for a frame.

  FIG. 1 shows a skeleton F such as an agricultural greenhouse or a large tent. In general, a round pipe, I-shaped steel, or the like is used for the skeleton F as a frame material (see Patent Document 1). Moreover, what used the square pipe for the frame material is also known (refer patent document 2, 3).

JP 2001-197836 A JP 2009-213355 A Utility Model Registration No. 3129683

  By the way, as shown in FIG. 2A, when the round pipe P is used as the frame material of the skeleton F, if it is bent in an arch shape, a wrinkle w is generated inside the bent portion b, and the bent portion b is It will be transformed into a horizontally long ellipse o. Therefore, when this is applied to the framework F of an agricultural greenhouse or the like, when an external force such as snow or a typhoon wind is applied, stress concentrates on the portion of the ridge w at the bent portion b, and the horizontally long ellipse o is Since the section modulus in the vertical direction is lower than that of the perfect circle c, the strength and rigidity are greatly reduced. For this reason, the framework F of the agricultural greenhouse is greatly deformed and may be destroyed, and safety concerns and a large amount of repair costs become problems.

  On the other hand, as shown in FIG. 2 (b), when the I-shaped steel I is used as the frame material, the bending along the surface direction of the web portion u of the I-shaped steel I is performed even if the I-shaped steel I is bent. Therefore, it is difficult to bend. Therefore, bending processing (on-site processing) according to the situation at the site is impossible and user-friendliness is poor. Even if it bends well, the bending radius becomes extremely large, which causes design limitations. Moreover, if it bends forcibly, wrinkle w will generate | occur | produce in the web part u of the I-shaped steel I, and intensity | strength will fall. Therefore, when this is used for the skeleton F of an agricultural greenhouse or the like, when an external force such as snow or typhoon winds is applied, the skeleton F is greatly deformed, and safety concerns and large repair costs become a problem.

  Although not shown, when a square pipe is used as the frame material, the same problem as that of the round pipe basically occurs.

  The object of the present invention, which was created in view of the above circumstances, is a hollow frame body for a frame used in a framework for agricultural greenhouses, large tents, etc., and when bent, can be bent smoothly and smoothly. And it is providing the hollow frame body for frames which can suppress the rigidity fall in a bending part as much as possible.

  According to the present invention created to achieve the above-described object, the pipe body is crushed into an inverted triangle shape so that the inner surfaces of the pipe bodies are in contact with the three apexes of the inverted triangle shape. A left flange portion that is crushed in the same manner, a right flange portion that is crushed so that the inner surfaces of the pipe bodies are in contact with each other, and a downward convex portion having an acute angle downward, and the lower convex portion and the left flange Are connected by a left curved portion curved inward of the pipe body, and the lower convex portion and the right flange portion are connected by a right curved portion curved inward of the pipe body, A space with an inverted triangular cross-section is formed inside the right flange part, downward convex part, left curved part, and right curved part, and when bent downward, the left curved part and the right curved part are bent. The part increases the curvature and moves into the space, and the lower convex part is upward It allows to move, the hollow frame member for framework, wherein there is provided that.

  In the above-described hollow frame material for a frame, the left curved portion and the right curved portion are arranged symmetrically about the downward convex portion, and the left flange portion and the right flange portion are symmetrical about the downward convex portion. And may be arranged on a straight line.

  In the above-mentioned hollow frame material for frames, the upper convex part protruding in a trapezoidal convex shape outwardly of the pipe body is formed symmetrically between the left flange part and the right flange part with the lower convex part as the center. And the through-hole by which the fastener for a connection is penetrated may be provided in the left flange part and the right flange part, respectively.

  The frame hollow frame material is bent downward, and at its bent portion, the left curved portion and the right curved portion are moved into the space with a higher curvature than the other bent portions, and the lower convex portion is moved upward. The shape may be different.

  According to the hollow frame material for a frame according to the present invention, a space having an inverted triangular cross section is formed inside the left flange portion, the right flange portion, the lower convex portion, the left curved portion, and the right curved portion. When bent downward, the left curved portion and the right curved portion move at the bent portion so that the left curved portion and the right curved portion are drawn into the space of the inverted triangular shape, and the lower convex portion moves upward. It can be bent smoothly and smoothly without causing wrinkles at the part and the right curved part. Therefore, bending is easy and stress concentration caused by wrinkles can be avoided. In addition, the shape after bending is such that the lower part of the space with an inverted triangular cross-section is crushed and approaches the cross-sectional shape of the T-shaped steel, and the cross-sectional modulus of the T-shaped steel is larger than the cross-sectional modulus of the round pipe. Reduction can be suppressed as much as possible.

It is a perspective view which shows the outline | summary of frame | skeletons, such as an agricultural greenhouse and a large tent. It is explanatory drawing which shows the conventional example of the frame material used for frame | skeleton, (a) is explanatory drawing of a round pipe, (b) is explanatory drawing of I-shaped steel. It is explanatory drawing of the hollow frame material for frames which concerns on one Embodiment of this invention, (a) is a perspective view of the hollow frame material for straight frames, (b) is the hollow frame material for frames bent downward. It is a perspective view. It is the IV-IV sectional view taken on the line of FIG.3 (b). (A) is a table | surface which shows the relationship between the cross-sectional shape and section modulus of various frame materials, (b) is explanatory drawing which shows the direction of the force of a section modulus. It is a side view of the horizontal frame material which connects the above-mentioned straight frame hollow frame material and the bent frame hollow frame material. (A) is the elements on larger scale of the connection part of FIG. 6, (b) is the VII-VII sectional view taken on the line of (a). (A) is the top view which arrange | positioned the horizontal frame material mentioned above at intervals, and connected them with the vertical frame material, (b) is a sectional side view of (a). It is a side view which shows the modification of the horizontal frame material mentioned above, (a) shows a 1st modification, (b) shows a 2nd modification, (c) shows a 3rd modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Hollow frame material 1)
In FIG. 3, the hollow frame material 1 for frames which concerns on one Embodiment of this invention is shown. FIG. 3A is a perspective view of a straight frame hollow frame material 1 and FIG. 3B is a perspective view of a bent frame hollow frame material 1b. The frame hollow frame materials 1 and 1b according to the present embodiment include an agricultural greenhouse, a large tent, a shopping arcade, a gutter cover, a car garage, a motorcycle garage, a bicycle garage, and a heavy snowy area passage. It is used for a skeleton F such as a roof part and an escape guideway roof part, and is used as a frame material of the skeleton F having a shape shown in FIG. However, it can be used for purposes other than these applications, and can be used for a skeleton F other than the shape shown in FIG.

  As shown in FIG. 3 (a), the hollow frame material 1 for a frame according to the present embodiment is formed by crushing a pipe body into an inverted triangle shape, and at the three apexes of the pipe body having an inverted triangle shape, A left flange portion 2 crushed so that the inner surfaces of the body are in contact with each other, a right flange portion 3 similarly crushed so that the inner surfaces of the pipe members are in contact with each other, and a downwardly convex convex portion 4 having an acute downward angle. The lower convex portion 4 and the left flange portion 2 are connected by a left curved portion 5 that is curved inwardly in the pipe body, and the lower convex portion 4 and the right flange portion 3 are similarly connected. The pipe body is connected by a right curved portion 6 that is curved inwardly and is surrounded by a left flange portion 2, a right flange portion 3, a lower convex portion 4, a left curved portion 5, and a right curved portion 6. A space 7 having an inverted triangular cross section is formed. Such a hollow frame material 1 for a frame is formed by roll forming in which a pipe body having a circular cross section as a raw material is passed between rollers in which a plurality of frames are arranged and gradually changed into an inverted triangular cross section.

  In the frame hollow frame material 1 according to the present embodiment, the left curved portion 5 and the right curved portion 6 are disposed symmetrically about the lower convex portion 4, and the left flange portion 2, the right flange portion 3, Are arranged symmetrically and on a straight line with the lower convex part 4 as the center. Moreover, between the left flange part 2 and the right flange part 3, the upper convex part 8 projected in a trapezoidal convex shape outward of the pipe body is formed symmetrically about the lower convex part 4, As shown in FIGS. 7A and 7B, the left flange portion 2 and the right flange portion 3 have through holes 9 through which coupling fasteners (screws, bolts, etc.) are inserted, respectively. Is provided. The through-hole 9 is formed by drilling at any of the “manufacturing factory”, “near the installation location”, and “on-site alignment at the time of installation” of the frame material 1.

As shown in FIG. 3 (a), the frame hollow frame material 1 is surrounded by a left flange portion 2, a right flange portion 3, a lower convex portion 4, a left curved portion 5 and a right curved portion 6 inside. As shown in FIG. 3 (b), when the space 7 having the inverted triangular cross section is formed, when bent downward, as shown in FIG. 5 and the right curved portion 6 are allowed to move into the space 7 with an increased curvature (degree of curvature, the same applies hereinafter), and the lower convex portion 4 is allowed to move upward. That is, as shown in FIG. 3 (b), in the frame hollow frame material 1 b bent downward, the bending portion b has the left bending portion 5 and the right bending portion 6 compared to those other than the bending portion b. It is drawn into the interior of the space 7 with an increased curvature, and the lower convex part 4 is pulled up.

(Action: Flexibility)
As shown in FIGS. 3 (a), 3 (b), and 4, when the frame hollow frame materials 1 and 1b according to the present embodiment are bent downward, the bent portion b is bent to the left. The part 5 and the right bending part 6 are pulled into the space 7 having an inverted triangular shape while increasing the curvature, and the lower convex part 4 is pulled upward, so that the left bending part 5 and the right bending part 6 are wrinkled. It can be bent smoothly without difficulty. Specifically, the frame hollow frame material 1b bent downward has curvatures of the left curved portion 5 and the right curved portion 6 at the center point e (side view center point) of the bent portion b shown in FIG. It changes gradually so that the degree of curvature of the left curved portion 5 and the right curved portion 6 decreases as it moves away from the center point e as indicated by the arrow f, and finally, it is indicated by a virtual line in FIG. Smoothly connects to the shape of curvature other than the bent part.

  That is, in the frame hollow frame materials 1 and 1b, when bent downward, the left curved portion 5 and the right curved portion 6 are smoothly and gradually increased at the center point e of the bent portion b and the vicinity thereof. In other words, the lower convex portion 4 is smoothly lifted upward, so that bending is allowed without causing wrinkles in the left curved portion 5 and the right curved portion 6. Therefore, the bending process is easy, the bending process (on-site process) according to the situation at the site is easy, and the usability is good. In addition, since wrinkles do not occur even when bent, stress concentration due to wrinkles can be avoided, and a decrease in strength rigidity due to wrinkles can be avoided. Moreover, since it can be bent smoothly without difficulty, the deformation for each part to be bent is always the same regardless of the operator, and a stable bent shape can be obtained.

  In the frame hollow frame materials 1 and 1b, the left curved portion 5 and the right curved portion 6 are disposed symmetrically about the lower convex portion 4, and the left flange portion 2 and the right flange portion 3 are They are arranged symmetrically and on a straight line with the lower convex part 4 as the center. For this reason, when bent downward, the left curved portion 5 and the right curved portion 6 are deformed so that the curvature is increased symmetrically in the left-right direction, and the torsion of the framed hollow frame material 1b after bending can be prevented. A stable bent shape can be obtained.

(Action: Strength and rigidity)
Moreover, in the frame hollow frame materials 1 and 1b shown in FIGS. 3 (a) and 3 (b), the shape of the bent portion b after bending is a left-curved portion with an increased curvature as shown in FIG. Since the lower part of 5 and the lower part of the right curved part 6 are pressed and brought into close contact with each other, the lower part of the space 7 having an inverted triangular section is crushed and approaches the sectional shape of the T-shaped steel. Here, since the section modulus of the T-section steel is larger than that of the round pipe, it is possible to suppress a decrease in rigidity at the bent portion b. This point will be described with reference to FIG.

  FIG. 5 (a) shows the relationship between the cross-sectional shape and the cross-sectional modulus of various frame materials (invention product, round pipe, T-shaped steel) to be compared. In order to appropriately compare various frame materials, the dimensions of the cross-sectional shapes of the invention product, round pipe, and T-shaped steel are set to be substantially the same. FIG. 5B shows the direction of the section modulus force. The direction in which external force due to natural disasters such as snowfall and typhoon winds becomes a problem is mainly the A direction. Therefore, the section modulus mentioned below is a numerical value for the A direction.

  As shown in FIG. 5 (a), the sectional modulus of the hollow frame material 1 for a frame according to the invention is 1.8 times the sectional modulus of a round pipe having substantially the same dimensions. Therefore, the hollow frame material 1 for a frame according to the invention has a basic strength rigidity 1.8 times higher than that of a round pipe in a straight shape before bending. Therefore, according to the hollow frame material 1 for a frame, the necessary strength and rigidity can be ensured without taking measures such as increasing the outer diameter size or bundling a plurality of like a round pipe, and promote cost reduction and weight reduction. it can.

  When the frame hollow frame material 1 is bent downward, the bent portion b after bending is pressed against the lower portions of the left curved portion 5 and the right curved portion 6 with increased curvature, as shown in FIG. The lower portion of the space 7 having an inverted triangular cross-section is crushed and approaches the cross-sectional shape of the T-shaped steel. Here, the section modulus of the T-shaped steel is 1.4 times the section modulus of the round pipe as shown in FIG. 5 (a). It is possible to suppress the decrease in strength rigidity at the bent portion b as much as possible.

(effect)
As explained above, according to the hollow frame materials 1 and 1b for a frame according to the present embodiment, the frame is a hollow frame body for a frame F used for agricultural greenhouses, large tents, etc., and has substantially the same dimensions. The basic rigidity is higher than that of a round pipe, and when bent, it can be bent smoothly without difficulty, and a decrease in rigidity at the bent portion b can be suppressed as much as possible. Therefore, it is easy to bend, and even if external forces such as snow or typhoon winds are applied, it can suppress the situation where the framework F of agricultural greenhouses etc. is greatly deformed, and safety concerns and large repair costs, etc. The problem can be avoided.

  Hereinafter, application examples of the present invention will be described.

(Horizontal frame 10)
FIG. 6 is a side view of a horizontal frame material 10 formed by connecting a straight frame hollow frame material 1 shown in FIG. 3 (a) and a bent frame hollow frame material 1b shown in FIG. 3 (b). The figure is shown. This horizontal frame material 10 is formed by connecting a central frame-shaped hollow frame material 1 and a frame-shaped hollow frame material 1b having the same shape, which is arranged at both left and right ends and bent at two positions. Thus, the cost can be reduced by using a straight part without a bending process at the center and sharing the left and right bending parts. The horizontal frame material 10 is used as a horizontal frame material of a skeleton F such as an agricultural greenhouse or a large tent shown in FIG. As described above, the frame-shaped hollow frame material 1b bent downward is moved to the inside of the space 7 with the left bending portion 5 and the right bending portion 6 being moved in the bending portion portion b as compared with other than the bending portion. The convex portion 4 has a shape moved upward.

  FIG. 7A is a partially enlarged view in which a connecting portion between the straight frame hollow frame material 1 and the bent frame hollow frame material 1b in FIG. 6 is enlarged, and FIG. It is the VII-VII sectional view taken on the line of a). As shown in the figure, through-holes through which coupling fasteners (screws, bolts, etc.) 11 are inserted into the left flange portion 2 and the right flange portion 3 of the hollow frame materials 1 and 1b to be coupled, respectively. 9 is provided. On the upper surfaces of the left flange portion 2 and the right flange portion 3, a rectangular plate-like upper connecting plate (connecting washer plate) 12 is disposed across the framed hollow frame materials 1 and 1b to be connected. . The connecting washer plate 12 has a hole 13 through which a screw as the fastener 11 is inserted.

  On the outer surfaces of the left curved portion 5 and the right curved portion 6, and on the lower surfaces of the left flange portion 2 and the right flange portion 3, a lower connecting plate (connecting tapping plate) 14 formed in a substantially V-shaped cross section so as to be in contact therewith is provided. It is arranged. The connection tapping plate 14 includes a substantially V-shaped main body 14 a that contacts the outer surfaces of the left curved portion 5 and the right curved portion 6, and a substantially flat plate-shaped fixing portion 14 b that contacts the lower surfaces of the left flange portion 2 and the right flange portion 3. Is formed integrally. A screw hole 15 into which a screw as the fastener 11 is screwed is formed in the fixing portion 14b of the connection tapping plate 14. Note that a bolt instead of a screw may be used for the fastener 11, a normal hole may be used instead of the screw hole 15, and a nut may be screwed onto the tip of the bolt.

  As shown in FIGS. 6 and 7, the framed hollow frame members 1, 1 b to be coupled are end-to-end but coupled by a coupling washer plate 12, a coupling tapping plate 14, and a fastener 11. Here, since the through holes 9 of the left flange portion 2 and the right flange portion 3 are formed in portions where the plate materials constituting the hollow frame materials 1 and 1b are folded and overlapped, the fastener 11 is connected to the tapping plate. Even when tightened into the screw hole 15, the shapes of the left flange portion 2 and the right flange portion 3 of the hollow frame material 1, 1 b are not deformed, and stable and firm fastening can be obtained. Moreover, since the recessed part in which the head part of the screw as the fastener 11 and the head part of the bolt are accommodated is formed in the connecting washer plate 12, the screw head part and the bolt head part protrude from the outer surface of the vinyl sheet. do not do. In addition, you may connect the hollow frame materials 1 and 1b for frames by welding.

(Combination with longitudinal frame 16)
FIG. 8A shows a plan view in which the horizontal frame members 10 described above are arranged in parallel at intervals, and these are connected by the vertical frame members 16, and FIG. FIG. As shown in the figure, the longitudinal frame member 16 is obtained by flattening the end portion of a round pipe to form a connecting portion 17, and a hole 18 is formed through the connecting portion 17. When the round pipe is viewed from the end surface direction, the connecting portion 17 is brought into one side of the round pipe and formed in a flat plate shape.

  When connecting the vertical frame member 16 to the horizontal frame member 10, first, the connecting portion 17 of the vertical frame member 16 is connected to the upper surface of the left flange portion 2 of the hollow frame member 1, 1b constituting the horizontal frame member 10, the right flange. It is arranged on the upper surface of the part 3. A through hole 9 is formed in the left flange portion 2 and the right flange portion 3 in accordance with the position of the hole 18 of the connecting portion 17. Bolts 19 are inserted into these holes 18 and through-holes 9, and nuts 20 are tightened at their tips, whereby the connecting portion 17 is fastened to the left flange portion 2 and the right flange portion 3. The longitudinal frame member 16 is assembled integrally.

  The thickness of the connecting portion 17 of the vertical frame member 16 is twice the pipe wall thickness because the end of the round pipe as the material is crushed and the pipe wall thickness is overlapped. The height is equal to the height of the upper projection 8 of the hollow frame material 1, 1 b constituting the frame material 10. For this reason, as shown in FIG. 8 (b), the upper projection 8 of the hollow frame members 1 and 1b forming the horizontal frame member 10, the connecting portion 17 and the round pipe forming the vertical frame member 16 are flush with each other, When a vinyl house is constructed by pasting vinyl on these outer surfaces, it is possible to avoid unevenness in the vinyl, and it is easy to paste vinyl. Further, by using a countersunk bolt for the bolt 19, no protrusion is generated on the outer surface of the vinyl sheet.

(Modification of horizontal frame 10)
In FIG. 9, the side view which concerns on the modification of the horizontal frame material 10 mentioned above is shown. A horizontal frame member 10a shown in FIG. 9 (a) is a first modified example, and is a horizontal frame member formed by connecting frame hollow frame materials 1b bent bilaterally symmetrically. As a result, the left and right parts can be shared. The connection structure is as described above, and the description thereof is omitted below.

  A horizontal frame member 10b shown in FIG. 9 (b) is a second modified example, and is used for a frame that is bent at a left and right both ends symmetrically and arranged at the left and right ends thereof. It is a horizontal frame material formed by connecting the hollow frame material 1b. As a result, the left and right parts can be shared.

  A horizontal frame member 10c shown in FIG. 9C is a third modified example, and is a frame-shaped hollow frame member 1d bent in a central square shape (mountain shape) and symmetrically disposed at both left and right ends thereof. It is a horizontal frame material which connected the hollow frame material for frames bent 1 place to 1b, and 1b. As a result, the left and right parts can be shared.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope described in the claims. Needless to say, the modified examples also belong to the technical scope of the present invention.

  INDUSTRIAL APPLICATION This invention can be utilized for the hollow frame body for frames used for frame | skeletons, such as an agricultural greenhouse and a large tent.

DESCRIPTION OF SYMBOLS 1 Frame hollow frame material 1b Frame hollow frame material 2 Left flange part 3 Right flange part 4 Lower convex part 5 Left curved part 6 Right curved part 7 Space 8 Up convex part 9 Through hole 10 Horizontal frame material 11 Fastener (screw) ,bolt)
16 Longitudinal frame material b Bending part

Claims (4)

The pipe body is crushed into an inverted triangular shape and molded.
At the three apexes of the pipe body having an inverted triangular cross section,
A left flange portion crushed so that the inner surfaces of the pipe bodies are in contact with each other;
A right flange portion crushed so that the inner surfaces of the pipe bodies are in contact with each other;
A downward convex part with an acute angle is disposed,
The lower convex portion and the left flange portion are connected by a left curved portion curved inward of the pipe body,
The lower convex part and the right flange part are connected by a right curved part curved inward of the pipe body,
Inside the left flange portion, the right flange portion, the lower convex portion, the left curved portion and the right curved portion, a space having an inverted triangular cross section is formed,
When bent downward, at the bent portion, the left curved portion and the right curved portion increase the curvature and move into the space to allow the lower convex portion to move upward.
A hollow frame material for a frame characterized by that. The left curved portion and the right curved portion are disposed symmetrically about the lower convex portion,
The left flange portion and the right flange portion are disposed symmetrically and on a straight line with the lower convex portion as a center,
The hollow frame material for a frame according to claim 1, wherein: Between the left flange portion and the right flange portion, an upper convex portion protruding in a trapezoidal convex shape outward of the pipe body is formed symmetrically about the lower convex portion,
The left flange portion and the right flange portion are provided with through holes through which coupling fasteners are inserted, respectively.
The hollow frame material for a frame according to claim 2, wherein: The frame hollow frame material according to any one of claims 1 to 3 is bent downward,
In the bent portion, compared to other than the bent portion, the left curved portion and the right curved portion have a shape in which the curvature is increased and moved into the space, and the lower convex portion is moved upward.
A bent hollow frame material for a frame.

Images