JP2016176287A - Aluminum pipe support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a problem of not satisfying a specified load as a whole, even when constituted so that the length can be adjusted, since a pipe support of a conventional aluminum alloy single pipe cannot adjust the length.SOLUTION: An aluminum pipe support 1 of the present invention comprises a pair of square pipes 2 set in the predetermined length, a washer member 3 out-fitted to one end of the square pipes 2 and abutting on an installation surface or a form face, a nut case 4 out-fitted to an opposite end part of the side provided with the washer member 3 of the square pipes 2 and forming a female screw on the inner periphery, a bolt 5 threadedly coming in and out to the nut case 4 and a handle 6 provided in the substantial center in the axial direction of the bolt 5, and at least the square pipes 2 are made of aluminum, and the nut case 4 also has a pair of female screws formed in the mutually inverse direction, and the bolt 5 is also constituted for forming a male screw in the inverse direction from a substantially central position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an aluminum pipe support that is made of aluminum, can be reduced in weight, can be adjusted in length, and has sufficient strength as a whole.

  When building a concrete structure, concrete is placed in the formwork. At this time, for example, a pipe support is used to support the formwork from the lower floor or from below when the slab is placed.

  Conventionally, this pipe support is generally configured as a double pipe, and its length can be adjusted. Regarding the length adjustment structure, the adjustment holes facing each other in the diametrical direction of the fitting portion of the outer tube and the inner tube are formed at the same pitch in the axial direction, and the fitting is performed when the overall length of the pipe support is adjusted. An adjustment pin is inserted into the adjustment hole to fix the position. Further, the conventional pipe support is provided with a washer that comes into contact with the installation surface or the formwork surface at an end of the outer tube and the inner tube opposite to the fitting portion.

  The conventional pipe support having the above-described structure has shaft rigidity, compression strength, etc. defined in the Japanese Industrial Standards (JIS), etc. (hereinafter collectively referred to as “specified load”), in order to satisfy this specified load. Therefore, since materials corresponding to those, that is, steel pipes and iron, were used, it took a lot of labor to transport them to the site when installing the formwork.

  Therefore, conventionally, in order to reduce the labor of such an operator, Patent Document 1 proposes that at least the outer tube and the inner tube of the pipe support configuration are made of an aluminum alloy.

  That is, in Patent Document 1, the outer diameter is smaller than the average outer diameter at both ends in the longitudinal direction and the thickness is thicker than the average thickness, and the outer diameter is larger than the average outer diameter at the center in the longitudinal direction. A pipe support made of an aluminum alloy single pipe, which is thicker and thinner than the average wall thickness, and has a smooth outer diameter and thickness change from both ends to the center, has been proposed.

  As described in Patent Document 1, an aluminum alloy may be used for simple weight reduction, but if the material is changed, the specified load may not be satisfied and the use may not be possible. There is a risk that the concrete cast with the formwork will collapse.

  In Patent Document 1, a single pipe made of an aluminum alloy is adopted to achieve the weight reduction of the pipe support, and the above configuration is used. However, this configuration has a problem that the length (height) cannot be adjusted.

  In the above point, for example, two single tubes made of aluminum alloy of Patent Document 1 are used, female threads are formed in opposite directions on the inner circumference of the butted ends, and male screws are formed in the opposite directions from the axial center. If the formed bolt is screwed in and connected, the length of the pipe support itself can be adjusted, but the following problem arises.

  That is, whether the aluminum alloy single pipe (round or square) of Patent Document 1 is a normal steel pipe, the load concentrates at the boundary part exposed from the pipe in the bolt, and buckling deformation occurs at this boundary part. As a result, there is a problem that the specified load is not satisfied as a whole.

JP-A-9-158500

  The problem to be solved is that the conventional single-pipe pipe support made of an aluminum alloy cannot be adjusted in length and does not satisfy the specified load as a whole even if the length can be adjusted.

  In order to solve the above-mentioned problems, the present invention provides a pipe support for supporting a formwork for placing concrete, which is installed with a pair of square tubes having a predetermined length and externally fitted to one end of the square tube. A nut case in which a washer member that comes into contact with a surface or a formwork surface, a nut case that is externally fitted to an end of the square tube opposite to the side on which the washer member is provided, and in which a female screw is formed on the inner periphery, and the nut case And a handle provided at substantially the center in the axial direction of the bolt, at least the square tube is made of aluminum, and the nut case is formed with female screws in opposite directions. The main feature is that the bolt has a configuration in which a male screw is formed in a reverse direction from a substantially central position.

  In the present invention, it is possible to reduce the weight by using a square tube made of aluminum, and the use of a square tube improves the resistance to buckling deformation with ribs at four corners as compared to a round tube. That is, it is possible to obtain an effect that the weight of the pipe support is reduced, the specified load is satisfied, and the length can be adjusted.

  In addition, the present invention can adjust the length by connecting the aluminum square tube with the nut case, and can improve the proof stress of the bolt at the boundary portion exposed from the tube by the nut case. It is possible to make the buckling deformation at the boundary portion less likely to occur.

It is an external view which shows schematic structure of the aluminum pipe support of this invention. The square tube in the aluminum pipe support of this invention is shown, (a) is a front view, (b) It is a top view. The washer member in the aluminum pipe support of this invention is shown, (a) is a top view, (b) is an A arrow directional view, (c) is a BB sectional view. The nut case in the aluminum pipe support of this invention is shown, (a) is a top view, (b) is CC sectional view taken on the line, (c) is DD sectional view. The bolt in the aluminum pipe support of this invention is shown, (a) is a top view, (b) (c) is a figure which shows the edge part which comprised the securing part. The handle | steering-wheel in the aluminum pipe supports of this invention is shown, (a) is a top view, (b) is a front view. The assembly state of the aluminum pipe support of the present invention is shown, (a) is a front view around the nut case, (b) is a view taken in the direction of arrow E, and (c) is a sectional view taken along line FF.

  The present invention relates to the problem that the specified load is not satisfied when an aluminum tube is used to reduce the weight of the pipe support, and the installation surface or formwork is fitted to one end of the square tube and the square tube. A washer member that comes into contact with the surface, a nut case that is externally fitted to the end of the square tube opposite to the side on which the washer member is provided, and an internal thread is formed on the inner periphery; And at least the square tube is made of aluminum, and the nut case has a pair of female screws formed in opposite directions. And the said bolt was eliminated by setting it as the structure by which the male screw of the reverse direction was formed from the approximate center position.

  Further, the present invention may be configured such that the washer member and the nut case configured as described above are each inserted and pressed and fixed so that the internally fitted square tube rotates. By doing so, the four corners (four corners) of the outer periphery of the square tube come into contact with the inner surfaces of the nut case and the washer member, and the square tube is fixed in a direction perpendicular to the vertical axis, thereby further improving the buckling deformation. Can be suppressed.

  Further, according to the present invention, in the configuration described above, the washer member and the nut case each have an inner tube portion that is inserted into an inner peripheral portion of the internally fitted square tube, and the nut case is disposed on the inner periphery of the inner tube portion. It is good also as a structure which forms a female screw. By doing so, the square tube can be easily positioned with respect to the washer member and the nut case.

  Moreover, this invention WHEREIN: You may thicken the thickness of the inner peripheral four corners of an aluminum square tube in the said structure. By doing so, the thickness can be reduced and the weight can be reduced, and at the same time, the outer diameter (vertical and horizontal dimensions) cross-sectional area can be increased, so that the value of the secondary radius of the cross section becomes large. It will have proof strength.

  Hereinafter, specific embodiments of the present invention will be described with reference to FIGS. An aluminum pipe support 1 (hereinafter referred to as a pipe support 1) of the present invention has a pair of rectangular tubes 2 having a predetermined length, and is externally fitted to one end of the rectangular tube 2 so as to be in contact with an installation surface or a formwork surface. A nut case 4 that is externally fitted to the end of the square tube 2 opposite to the side on which the washer member 3 is provided and a female screw is formed on the inner periphery, and a screw-in and out of the nut case 4 And a handle 6 provided at substantially the center in the axial direction of the bolt 5.

  In this example, the square tube 2, the washer member 3, the nut case 4, and the bolt 5 are all made of aluminum. As shown in FIG. 2, the square tube 2 has four corners on the inner periphery. By doing so, even if a long-sized square tube 2 is used, buckling deformation hardly occurs.

  As shown in FIG. 3, the washer member 3 has a circular through hole 3 b formed at the center of the flange portion 3 a that contacts the installation surface. An inner fitting portion 3c that is fitted into the square tube 2 extends around the through hole 3b. The inner fitting portion 3c is cylindrical and has the same inner diameter as the through hole 3b.

  Further, in the flange portion 3a, an outer fitting portion 3d that is fitted onto the square tube 2 is extended in the same direction as the inner fitting portion 3c, with the through hole 3b (inner fitting portion 3c) as the center. The outer tube portion 3d has a higher extension height with respect to the flange portion 3a than the inner fitting portion 3c.

  In the outer fitting portion 3d, for example, in the present example, a positioning portion 3e having a reduced thickness is formed at the center of the four sides of the inner periphery. The positioning portion 3e is for positioning the four outer corners of the square tube 2 when the square tube 2 described later is axially rotated and pressed and fixed.

  Furthermore, in this example, the outer fitting portion 3d is formed with two upper and lower fixing screw holes 3f at point-symmetrical positions in the center of the through hole 3b on each of the pair of facing surfaces of the two pairs of facing surfaces. Has been.

  As shown in FIG. 4, the nut case 4 is formed into a cylindrical shape having an inner diameter slightly larger than the outer diameter of the square tube 2 as a whole, with one end having a bottom, and a bolt 5 is screwed into the bottom. A bolt hole 4a is formed, and an inner fitting portion 4b is formed from the inner surface of the bottom portion into the square tube 2 with the same inner diameter as the bolt hole 4a. And the female screw 4c is formed in the internal peripheral surface of the bolt hole 4a and the internal fitting part 4b.

  Further, the nut case 4 is formed as an outer fitting portion 4d having a cylindrical inner periphery fitted to the square tube 2, and in this example, a bolt hole is formed in each of a pair of opposed surfaces of the two pairs of opposed surfaces. A fixed screw hole 4e having two upper and lower stages is formed at a point-symmetrical position at the center of 4a.

  The pipe support 1 has two types of nut cases 4 having the above-described configuration in which the direction of the female screw 4c is opposite to each other. FIG. 4 shows one direction of the female screw 4c.

  The bolt 5 has a solid shaft shape, and male screws 5a are formed in opposite directions with respect to the central portion of the shaft length. Holes 5b are formed at both ends of the bolt 5, and a retaining portion 5c is formed through the bolt 5 and a nut through the hole 5b. The retaining portion 5 c is for preventing the bolt 5 from coming out of the bolt hole 4 a of the nut case 4.

  As shown in FIG. 6, the handle 6 is provided at a central portion in the axial length direction of the bolt 5. The handle 6 has a screw hole 6a formed at the center in the width and height directions, and a screw 6b is screwed into the handle 6 and the screw 6b is screwed to the bolt 5 to be fixed.

  The pipe support 1 having the above configuration is assembled as follows, for example. First, for example, two square tubes 2 are prepared, and a washer member 3 is attached to an end portion of each of the square tubes 2 and 2. The square tube 2 and the washer member 3 are attached by inserting the square tube 2 into the outer fitting portion 3d of the washer member 3 and simultaneously inserting the inner fitting portion 3c into the square tube 2.

  Subsequently, a screw 3 g is screwed into the fixing screw hole 3 f of the washer member 3. The screws 3g are screwed in until the four corners of the square tube 2 in the outer fitting portion 3d are accommodated in the positioning portion 3e. By doing so, the washer member 3 of the square tube 2 does not rattle and is fixed without coming off in the axial direction.

  On the other hand, a pair of nut cases 4 and 4 in which female screws 4c are formed in opposite directions are prepared, and male screws 5a that can be screwed into the respective female screws 4c and 4c are formed in the nut cases 4 and 4, respectively. The end of the bolt 5 is screwed.

  The bolt 5 is assumed that the handle 6 is fixed to the center in the axial direction in advance by a screw 6b, and is screwed in beyond the height of the outer tube portion 4d of the nut case 4, and then the screw is inserted into the hole 5b. Thus, the retaining portion 5c is formed.

  Subsequently, the opposite end of the square tube 2 provided with the washer member 3 to the side where the washer member 3 is provided is inserted into the outer fitting portion 4d of the nut case 4 into which the bolt 5 is screwed. The internal fitting portion 4 b is inserted into the square tube 2.

  Then, screws 4 f are screwed into the fixing screw holes 4 e of the nut case 4. The screw 4f is screwed to such an extent that the square tube 2 in the outer fitting portion 4d does not rotate further. By doing so, the square tube 2 does not rattle in the nut case 4 and is fixed without coming off in the axial direction. This state is the state shown in FIG.

  Thereafter, in this example of the formwork, the pipe support 1 assembled below is installed, and the handle 6 can be turned to adjust the length of the pipe support. That is, by turning in one direction, for example, the space between the nut cases 4 and 4 (square tubes 2 and 2) is increased according to the shaft rotation of the bolt 5 on which the reverse screw is formed, and the pipe support length is increased. By turning the nut, the interval between the nut cases 4 and 4 (square tubes 2 and 2) approaches and the pipe support length becomes shorter.

  Moreover, since the square tube 2 is firmly screwed so that the square tube 2 rotates in the washer member 3 and the nut case 4 in the pipe support 1, the load distribution between the washer member 3 and the nut case 4 becomes smooth, Buckling due to load concentration is unlikely to occur and the specified load can be satisfied sufficiently. This point was confirmed by a verification experiment.

  The pipe support 1 of the present invention is lighter than the pipe support using iron or steel pipes, and the weight of a single pipe support having a pipe length of 1 m + 1.5 m is 12 kg for the present invention compared to 10 kg for the present invention. I was able to. This weight difference becomes more prominent as the tube length becomes longer.

Furthermore, since the pipe support 1 of the present invention can be disassembled to the square tube 2, the washer member 3, the nut case 4, the bolt 5, and the handle 6 (and can be assembled on site), it is easy to carry.

1 (Aluminum) pipe support 2 Square tube 3 Washer member 4 Nut case 5 Bolt 6 Handle

Claims (4)

  A pipe support for supporting a mold for placing concrete, a pair of square tubes having a predetermined length, and a washer member that is externally fitted to one end of the square tube and abuts against an installation surface or a mold surface A nut case externally fitted to an end of the square tube opposite to the side where the washer member is provided, a female screw formed on the inner periphery, a bolt screwed into and out of the nut case, and the bolt And at least the square tube is made of aluminum, and the nut case has a pair in which female screws in opposite directions are formed, and the bolt is An aluminum pipe support characterized in that a male screw is formed in a reverse direction from a substantially central position.   2. The aluminum pipe support according to claim 1, wherein the washer member and the nut case are each fixed by inserting a screw so that the internally fitted square tube rotates.   The washer member and the nut case each have an inner tube portion to be inserted into the inner peripheral portion of the internally fitted square tube, and the nut case has a female screw formed on the inner periphery of the inner tube portion. The aluminum pipe support according to claim 1 or 2.   The aluminum pipe support according to any one of claims 1 to 3, wherein the thickness of the four inner corners of the aluminum square tube is increased.

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