JP2014020145A - Fixing device for extensible pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device for an extensible pipe used for a temporary scaffold or the like, e.g., an extensible pipe constituting an extensible balustrade.SOLUTION: A fixing device is configured to fix a large-diameter pipe (6) and a small-diameter pipe (7) constituting an extensible pipe (5) in a desired extended axial length state and comprises a support member (14) which is fixed while facing an end portion of the large-diameter pipe (6), and a wedge member (15) provided in the support member (14). The support member (14) includes an arcuate inner side face (19) for receiving an arcuate outer side face (7b) formed in a first side part (X1) of the small-diameter pipe (7). The arcuate inner side face (19) is formed in the shape of a circular arc around an axial center A3 concentric with an axial center A1 of the large-diameter pipe (6), and an inner diameter D3 of the arcuate inner side face (19) is formed equal with an outer diameter D2 of the arcuate outer side face (7b) of the small-diameter pipe (7). When the wedge member (15) is knocked in, the first side part (X1) of the small-diameter pipe (7) is press-contacted by the arcuate inner side face (19) and the large-diameter pipe (6) and the small-diameter pipe (7) are fixed to each other while making the mutual axial centers A1, A2 concentric.

Description

The present invention relates to a telescopic tube used in a temporary scaffold or the like, for example, a telescopic tube fixing device constituting a telescopic handrail.

A temporary scaffold constructed at a construction site or the like is preferably provided with a handrail to ensure the safety of workers.

Such a handrail is attached between a pair of struts, but there are cases where the spacing between the struts is different, so an extendable handrail that can be freely attached according to the difference in spacing conditions is provided. Yes.

JP 2003-247337 A

The above-mentioned telescopic handrail comprises a telescopic tube in which a large-diameter tube and a small-diameter tube formed concentrically with each other are fitted in an axial direction so as to be stretchable and contracted so as to have a desired length. A fixing device for fixing the pipe and the small-diameter pipe to each other is provided.

The fixing device is generally configured by a set bolt screwed into a portion near the end of the large-diameter pipe. The set bolt is loosened so that the small-diameter pipe can be slid. When the bolt is tightened, the tip of the set bolt presses the small-diameter pipe so that it is fixed so as not to slide.

By the way, in order to make the telescopic tube extendable, a clearance is required between the large diameter tube and the small diameter tube. At this time, in order to make the expansion / contraction operation smooth and easy, it is preferable to form a large clearance.

However, since the fixing device is configured to press the small-diameter pipe with the tip of the set bolt and fix the small-diameter pipe by pressing the small-diameter pipe against the inner peripheral surface on the opposite side of the large-diameter pipe, There is a problem that the shaft centers of the small-diameter pipes are eccentric from each other. In other words, in order to reduce the amount of eccentricity, the clearance must be made small, so there is a problem that the expansion and contraction operation is not smooth and easy.

Therefore, an object of the present invention is to provide a fixing device that can fix the shaft centers of the large diameter tube and the small diameter tube in a concentric state.

Further, in the case of the telescopic handrail in the temporary scaffold, it is preferable that a bracket is provided at both ends of the telescopic tube made up of a large diameter tube and a small diameter tube, and the bracket is fastened to a pair of support means. However, when the telescopic tube is expanded and contracted, if the large-diameter tube and the small-diameter tube are rotatable in the circumferential direction, it is necessary to control the orientation of the brackets at both ends with respect to the column coupling means, and the There is a problem that the work cannot be performed quickly and easily.

For this reason, an object of the present invention is to provide a fixing device that can expand and contract the expansion tube while maintaining the posture of the bracket so that the brackets provided at both ends of the expansion tube can be immediately fastened to the column. There is in point to do.

Another object of the present invention is to provide a highly reliable fixing device that is difficult to loosen from a fixed state, and further includes a telescopic tube provided with a bracket that can be tightened freely without being influenced by the posture condition of the tightening means in the pair of columns. The point is to provide a fixing device.

Therefore, in order to solve the above problems, the present invention is configured as a means in which the inner diameter D1 of the large-diameter tube and the outer diameter D2 of the small-diameter tube are formed as D1> D2, and both the tubes are fitted to be extendable in the axial direction. In a device for constituting a combined expansion tube and fixing a large diameter tube and a small diameter tube to each other, a support member facing the end of the large diameter tube is fixed to the large diameter tube, and a wedge member is attached to the support member With respect to the X axis and the Y axis, which are located at the axis A2 of the small diameter tube and are orthogonal to each other, both sides in the X axis direction of the outer peripheral surface of the small diameter tube are respectively the first side portion and the second side portion. A side part, both sides in the Y-axis direction are respectively defined as a third side part and a fourth side part, and at least a first side part is formed with an arc outer surface centered on the axis, and the support member is A receiving portion facing the first side portion of the small-diameter tube, and a second portion of the small-diameter tube from the receiving portion toward the X-axis direction. An extension portion extending to a position exceeding the portion is provided, and the receiving portion includes an arc inner surface that receives the first side portion of the small-diameter pipe, and the arc inner surface is used as an axis A1 of the large-diameter pipe. The inner diameter D3 of the inner surface of the arc is the same as the outer diameter D2 of the outer surface of the arc of the small-diameter tube, and the wedge member includes the extension portion. When the wedge member is moved in the Y-axis direction with the small-diameter pipe fitted into the large-diameter pipe, the wedge member is moved to the small-diameter pipe. By pressing the second side portion of the first member in the X-axis direction and pressing the first side portion against the inner surface of the arc of the support member, the large-diameter tube and the small-diameter tube are connected to each other with the axial centers A1 and A2 being concentric. It is in the point which comprises so that it may fix to.

In a preferred embodiment of the present invention, the telescopic tube is disposed between a pair of struts provided with a fastening means, a bracket provided at an extended end of the large diameter pipe is fastened to the fastening means of one strut, and the small diameter is provided. A fixing device for a telescoping tube for a temporary scaffold for fixing a large-diameter tube and a small-diameter tube in a state where a bracket provided at an extended end of the tube is tightly connected to a fastening means of the other support column, and the small-diameter tube is connected to the second side And the third side portion are formed in a circular arc shape concentric with the arc outer surface of the first side portion, and the groove portion is formed by recessing and deforming the fourth side portion, and the groove portion is extended in the axial direction. The large-diameter pipe is provided with positioning means for fitting into the groove.

Preferably, the X-axis is a horizontal direction and the Y-axis is a vertical direction, and the small-diameter pipe is pressed in the horizontal direction by striking the wedge member downward.

More preferably, the telescoping pipe constitutes a telescoping handrail for a temporary scaffold, and the bracket is pivotally connected to the extended ends of the large diameter pipe and the small diameter pipe.

According to the first aspect of the present invention, the wedge member 15 is driven in the Y-axis direction with the large-diameter pipe 6 and the small-diameter pipe 7 constituting the telescopic pipe 5 set to the desired telescopic axis length, and the small-diameter pipe 7 The second side portion X2 is pressed in the X-axis direction, and the first side portion X1 is pressed against the arc inner surface 19 of the support member 14, so that the shafts A1 and A2 are concentric with each other. Since the structure is fixed, even when a sufficient clearance is formed between the pipes 6 and 7 in order to facilitate the expansion and contraction, the pipes 6 and 7 are not eccentric and are aligned on the coaxial line. There is an advantage fixed in.

Since the wedge member 15 driven in the Y-axis direction is locked to the second side portion X2 in a state orthogonal to the axis of the small-diameter tube 7, the wedge member 15 is firmly pressed against the expansion / contraction direction of the small-diameter tube 7. A locking force is obtained.

According to the second aspect of the present invention, when the brackets 8, 8 of the telescopic tube 5 are fastened between the pair of struts 1, 1 in the temporary scaffold, the large diameter tube 6 is formed in the groove 11 formed in the small diameter tube 7. Since the positioning means 12 is fitted, the large-diameter pipe 6 and the small-diameter pipe 7 hold the brackets 8 and 8 at both ends in a predetermined posture without rotating in the circumferential direction during the expansion and contraction work. This facilitates the work of fastening the brackets 8 and 8 to the fastening means of the support columns 1 and 1. And since the small diameter pipe | tube 7 extended | stretched from the large diameter pipe 6 is reinforced by the groove part 11, it does not deform | transform easily and becomes the thing excellent in durability.

According to the third aspect of the present invention, since the driving direction of the wedge member 15 is configured downward, if the wedge member 15 is lowered by its own weight in a state where the expansion / contraction tube 5 is set as a reference expansion / contraction shaft length. Further, a temporary fixing means for preventing expansion and contraction is configured, the mounting operation of the expansion tube 5 is facilitated, and when the fixing device 10 is fixed, the hammering operation is easy. Further, after the driving is completed, the wedge member Since 15 receives a downward force due to its own weight, it is difficult to loosen and maintains a tight state.

According to the fourth aspect of the present invention, since the brackets 8 and 8 can swing freely, the bracket 8 is always attached even when the posture of the fastening means in the pair of support columns 1 and 1 is different. It is possible to bind tightly, and the fitting of the groove 11 and the positioning means 12 prevents mutual rotation of the large diameter pipe 6 and the small diameter pipe 7 and holds the brackets 8 and 8 at both ends in a predetermined posture. The work of fastening the brackets 8 and 8 to the fastening means of the support columns 1 and 1 is easy.

It is a top view which shows the attachment state in a temporary scaffold regarding the expansion-contraction handrail which concerns on one Embodiment of the expansion-contraction pipe | tube of this invention. The telescopic handrail is shown, (A) is a plan view, (B) is a plan view in a state where the bracket is fastened with a swinging posture, (C) is a front view in an expanded state, and (D) is a front view in a contracted state. FIG. It is a perspective view which shows the state which isolate | separated the small diameter pipe | tube from the fixing device regarding the fixing device which concerns on one Embodiment of this invention. It is a perspective view which shows the state which fixed the small diameter pipe | tube with the said fixing device. It is a center longitudinal cross-sectional view which shows the state which fixed the small diameter pipe | tube with the said fixing device. FIG. 2 shows an operation of fixing a small-diameter pipe by the fixing device, wherein (A) is a cross-sectional view showing a state before moving the wedge member, and (B) is a cross-sectional view showing a fixed state after moving the wedge member. is there. The design of the fixing bracket of the expansion-contraction pipe | tube for scaffolds which concerns on this invention is shown, (A) is a front view, (B) is a rear view. Regarding the design, (A) is a plan view and (B) is a bottom view. Regarding the design, (A) is a right side view and (B) is a left side view. (A) is the sectional view on the AA line of FIG. 7 (A), (B) is a perspective view regarding the said design.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The drawings and the following description illustrate the telescopic handrail 5a in the temporary scaffold as the telescopic tube 5 and shows a fixing device that fixes the telescopic handrail in an arbitrary telescopic state, but the present invention is not limited to the telescopic handrail. Of course, it should be understood that the present invention can be widely applied to various telescopic pipes other than the telescopic handrails used for temporary scaffolds and other telescopic pipes in other technical fields.

FIG. 1 exemplifies a temporary scaffold in which a work floor that constitutes a worker's work space and a traveling passage is formed in a bent shape, and shows a temporary scaffold having a flange-type wedge fastening structure. The support column 1 is fixedly provided with a flange 2 made of a metal plate with a predetermined interval in the vertical direction, and is erected with a predetermined interval in a perspective direction with respect to the outer wall of a building or the like (hereinafter referred to as “wife direction”). A pair of support columns 1 and 1 is set as one set and is erected at a predetermined interval in a direction along an outer wall of a building or the like (hereinafter referred to as “girder direction”). A horizontal member 3 is installed between a pair of struts 1 and 1 adjacent to each other in the wife direction, and the struts 1 and the horizontal member 3 are fixed to each other by a binding means having a wedge structure. The scaffolding plate 4 is mounted on the matching horizontal members 3 and 3, thereby forming a work floor.

The temporary scaffold illustrated in FIG. 1 is constructed, for example, so as to form an annular work floor along the outer wall of an annular tower-shaped building, and a distance L1 between a pair of struts 1 and 1 located outside the wife side. On the other hand, the distance L2 between the pair of struts 1 and 1 located on the inner side of the wife is L2 <L1, and a telescopic handrail 5a that can be stretched is attached between each pair of struts. Accordingly, the telescopic handrail 5a attached on the outer side of the wife side is attached in an extended state corresponding to the interval L1. Further, the telescopic handrail 5a attached to the inner side of the wife side corresponds to the interval L2 and is attached in a contracted state.

As shown in FIG. 2, the telescopic handrail 5a constitutes the telescopic tube 5 in which a large-diameter tube 6 and a small-diameter tube 7 formed concentrically with each other are fitted in an axially stretchable manner. That is, brackets 8 are provided at the extending ends of the large-diameter pipe 6 and the small-diameter pipe 7 in the extending direction, and the brackets 8 and 8 can be freely attached to and detached from the flanges 2 of the pair of columns 1 and 1 via wedge means. Tightly tied to. In addition, since the bracket 8 is the same as the well-known bracket provided in the both ends of the said horizontal member 3, detailed description is abbreviate | omitted.

As shown in FIG. 1, in the temporary scaffolding in which the work floor is formed in a bent shape as illustrated in FIG. 1, the flange 2 of the columns 1 and 1 adjacent to each other in the girder direction expands and contracts the wedge hole of the flange 2 as shown in FIG. There are a case where it is aligned in the axial direction of the tube 5 and a case where the wedge hole of the flange 2 is displaced in the axial direction of the telescopic tube 5 as shown by an angle θ in FIG. Depending on the attachment location of the handrail 5a, the posture condition of the wedge hole is different.

For this reason, the bracket 8 is pivotably connected to the extended ends of the large-diameter pipe 6 and the small-diameter pipe 7 via the pivot 9 in the vertical direction. As a result, the bracket 8 is always well coupled to the wedge holes of the flange 2 having different posture conditions simply by rotating in the horizontal direction.

The large-diameter pipe 6 and the small-diameter pipe 7 expanded and contracted so as to have a desired length are fixed so as not to be expanded and contracted by a fixing device 10 described in detail below.

As shown in FIG. 3, the large-diameter pipe 6 and the small-diameter pipe 7 constituting the telescopic pipe 5 are each made of a metal circular pipe material having an inner peripheral surface and an outer peripheral surface that are concentric circles. The large-diameter pipe 6 has an inner peripheral surface 6a and an outer peripheral surface 6b, and the inner peripheral surface 6a forms a circumferential surface defined by an inner diameter D1 centered on the axis A1. On the other hand, the small diameter tube 7 has an inner peripheral surface 7a and an outer peripheral surface 7b, and the outer peripheral surface 7 forms a circumferential surface defined by an outer diameter D2 centering on the axis A2. The inner peripheral surface 6a of the large-diameter pipe 6 and the outer peripheral surface 7b of the small-diameter pipe 7 are formed as D1> D2, and at this time, when the small-diameter pipe 7 is inserted into the large-diameter pipe 6, it can slide smoothly and easily. And a sufficient clearance C (C = D1-D2).

When the X axis and the Y axis are the axes positioned at the axis A2 of the small diameter tube 7 and orthogonal to each other, the outer peripheral surface 7b of the small diameter tube 7 has a first side on each side in the X axis direction. A portion X1 and a second side portion X2 are formed, and a third side portion Y1 and a fourth side portion Y2 are formed on both sides in the Y-axis direction, respectively. In the illustrated embodiment, the X axis is the horizontal direction and the Y axis is the vertical direction. Therefore, the small-diameter pipe 7 forms a groove 11 by forming an arc outer surface 7b centered on the axis A2 at least on the first side X1, and recessing and deforming the fourth side Y2. The groove 11 extends in the axial direction. In the illustrated embodiment, in addition to the first side portion X1, the second side portion X2 and the third side portion Y1 are also formed with an arc outer surface 7b centered on the axis A2.

As shown in FIG. 5, positioning means 12 that fits into the groove 11 is provided in the large-diameter pipe 6 with the small-diameter pipe 7 inserted into the large-diameter pipe 6. The positioning means 12 is constituted by, for example, a bolt screwed into the large-diameter pipe 6 so as to be able to advance and retreat. When the small-diameter pipe 7 is extended so as to have the maximum axial length, the tip of the bolt is the end portion of the groove 11. The retaining means 13 is configured by engaging with 11a.

As shown in FIG. 3, the fixing device 10 includes a support member 14 and a wedge member 15, and includes a connecting member 16 for fixing the support member 14 to the large-diameter pipe 6. The connecting member 16 constitutes an arm made of a metal plate having a U-shaped cross section, and is fixed to the bottom of the support member 14 by welding or the like, and the arm is fixed to the outer peripheral surface of the end portion of the large-diameter pipe 6 by welding or the like. Thus, the support member 14 is fixed so as to face the end of the large-diameter pipe 6.

The support member 14 is formed by bending a thick metal plate into a U shape, and includes a receiving portion 17 facing the first side portion X1 of the small-diameter tube 7 and the X from the both ends of the receiving portion 17. Extension parts 18 and 18 extended to the position exceeding the 2nd side part X2 of the said small diameter pipe 7 toward the axial direction are provided.

In a state where the support member 14 is fixed to the large diameter pipe 6 by the connecting member 16, the receiving portion 17 includes an arc inner side surface 19 for receiving the outer peripheral surface 7 b of the first side portion X 1 of the small diameter tube 7. The arc inner surface 19 draws an arc centered on the axis A3 concentric with the axis A1 of the large-diameter pipe 6, and the inner diameter D3 of the arc inner surface 19 is outside the arc of the small-diameter pipe 7. The side surface 7b is formed to have the same diameter (D3 = D2) as the outer diameter D2.

The wedge member 15 is slidably inserted in wedge paths 20 and 20 formed in the Y-axis direction of the extension portions 18 and 18. At this time, it is preferable to provide retaining members 21 and 21 that prevent the wedge member 15 from escaping from the wedge passages 20 and 20 with the wedge member 15 retracted upward. Note that the wedge passage 20 of the lower extension 18 is formed wide so that it can pass through the lower retaining member 21 (see FIG. 8B), as shown in FIG. 6A. As described above, the wedge member 15 moves largely upward and retracts to a position where the lower retaining member 21 (shown by 21x in the drawing) is locked to the upper wedge passage 20 (shown by 20x in the illustrated manner). It is possible to make it.

As shown in FIG. 4, with the small-diameter pipe 7 fitted into the large-diameter pipe 6, the head 15a of the wedge member 15 retracted upward is beaten with a hammer or the like, and driven downward in the Y-axis direction. The wedge member 15 presses the second side portion X2 of the small-diameter pipe 7 in the X-axis direction, and presses the first side portion X1 against the arc inner surface 19 of the support member 14, and thereby the mutual axial centers A1, A2 Are concentric, and the large-diameter pipe 6 and the small-diameter pipe 7 are fixed to each other. At this time, since the wedge member 15 after driving is locked to the second side portion X2 in a state orthogonal to the axis of the small diameter tube 7, the wedge member 15 is strong against the expansion and contraction direction of the small diameter tube 7. The small diameter tube 7 is securely prevented from expanding and contracting.

When the telescopic handrail 5a as shown in the illustrated embodiment is attached between the pair of support columns 1 and 1, when the wedge member 15 is retracted upward as described above, the large-diameter pipe 6 and the small-diameter pipe 7 can be mutually expanded and contracted. Therefore, the bracket 8 at both ends may be fastened to the flange 2 and then fixed by the fixing device 10 as shown in FIG. During the expansion / contraction operation, the large-diameter pipe 6 and the small-diameter pipe 7 are positioned without rotating in the circumferential direction by the groove 11 and the positioning means 12, and hold the brackets 8 and 8 at both ends in a predetermined posture. As a result, the fastening operation for the flange 2 can be performed quickly and easily. If the wedge member 15 is provided in the vertical direction as shown in the drawing, the wedge member 15 can be expanded and contracted by lifting, but when released from the lift, the wedge member 15 descends by its own weight, and the small diameter tube 7 Since the expansion and contraction is prevented by abutting against the second side portion X2, the temporary fixing means is configured simply by lowering the wedge member 15 in a state where the length of the expansion / contraction shaft is set as a reference, and the attachment work of the expansion / contraction handrail 5a is facilitated.

After the brackets 8 at both ends are fastened to the flange 2, the wedge member 15 is hammered with a hammer or the like from the state shown in FIG. 6 (A) and driven downward as shown in FIG. 6 (B). The two side portions X2 are pressed as indicated by the arrow F, and are fixed in a state where the first side portion X1 is in pressure contact with the arc inner surface 19 of the support member 14. In this way, if the wedge member 15 is configured to be driven downward, the operator's hammering operation with a hammer or the like is facilitated. The large-diameter pipe 6 and the small-diameter pipe 7 are fixed by the arc inner side surface 19 of the support member 14 so that the axial centers A1 and A2 are concentric and cannot be expanded and contracted. It is fixed on the coaxial line in a state where the clearance C is held around the entire circumference. Even after the driving is completed, since the wedge member 15 receives a downward force due to its own weight, the wedge member 15 is hardly loosened and maintains a wedge-tight state.

The telescopic handrail 5a is attached between the pair of support columns 1 and 1 to ensure the safety of the operator. Since the small-diameter pipe 7 extending from the large-diameter pipe 6 is reinforced by the groove portion 11, it does not easily deform and has excellent durability.

DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Flange 3 Horizontal member 4 Scaffold plate 5 Telescopic tube 5a Telescopic handrail 6 Large diameter tube 6a Inner peripheral surface 7 Small diameter tube 7b Outer peripheral surface X1 First side portion X2 Second side portion Y1 Third side portion Y2 Fourth side Part 8 bracket 9 pivot 10 fixing device 11 groove part 11a terminal part 12 positioning means 13 retaining means 14 support member 15 wedge member 15a head 16 connecting member 17 receiving part 18 extension part 19 arc inner surface 20 wedge path 21 retaining member

Claims (4)

The inner diameter D1 of the large diameter pipe (6) and the outer diameter D2 of the small diameter pipe (7) are formed so that D1> D2, and the expansion pipe (5) is formed by fitting both the pipes in the axial direction. In a device that fixes a pipe and a small diameter pipe together,
A support member (14) facing the end of the large diameter pipe (6) is fixed to the large diameter pipe, and a wedge member (15) is provided on the support member (14).
With respect to the X axis and the Y axis, which are located at the axis A2 of the small diameter tube (7) and are orthogonal to each other, both sides in the X axis direction of the outer peripheral surface of the small diameter tube are respectively the first side portion (X1) and The second side part (X2) is defined as the third side part (Y1) and the fourth side part (Y2) as both sides in the Y-axis direction, and at least the first side part (X1) is centered on the axis A2. Forming an arc outer surface (7b)
The support member (14) includes a receiving portion (17) facing the first side portion (X1) of the small-diameter tube, and a second side portion of the small-diameter tube from the receiving portion toward the X-axis direction. Provide an extension (18) that extends to a position exceeding (X2),
The receiving portion (17) includes an arc inner surface (19) for receiving the first side portion (X1) of the small-diameter tube, and the arc inner surface (19) is an axis of the large-diameter tube (6). It is formed in an arc centering on an axis A3 concentric with A1, and the inner diameter D3 of the inner surface (19) of the arc is formed to be the same diameter as the outer diameter D2 of the outer arc surface (7b) of the small diameter tube (7). And
The wedge member (15) is slidably inserted in a wedge passage (20) formed in the Y-axis direction of the extension (18),
When the wedge member (15) is moved in the Y-axis direction with the small-diameter pipe (7) fitted into the large-diameter pipe (6), the wedge member is moved to the second side portion (X2 of the small-diameter pipe (7)). ) In the X-axis direction, and the first side portion (X1) is pressed into contact with the arc inner surface (19) of the support member (14), so that the shafts A1 and A2 are concentric with each other. A telescopic tube fixing device characterized in that (6) and the small-diameter tube (7) are fixed to each other. The telescopic tube (5) is disposed between a pair of struts (1, 1) provided with a binding means, and a bracket (8) provided at an extended end of the large-diameter tube (6) is attached to one strut (1). In the state where the bracket (8) provided at the extended end of the small-diameter pipe (7) is fastened to the fastening means of the other strut (1), the large-diameter pipe (6) and the small-diameter pipe (7 ) Is a telescoping tube fixing device for temporary scaffolding,
The small diameter pipe (7) has the second side part (X2) and the third side part (Y1) formed in an arc shape concentric with the arc outer surface (7b) of the first side part (X1), A groove (11) is formed by recessing and deforming the fourth side (Y2), and the groove extends in the axial direction;
The expansion tube fixing device according to claim 1, wherein the large-diameter pipe (6) is provided with positioning means (12) fitted into the groove (11). The X-axis is a horizontal direction, the Y-axis is a vertical direction, and the small-diameter pipe (7) is pressed in the horizontal direction by striking the wedge member (15) downward. The expansion / contraction tube fixing device according to claim 1 or 2, characterized in that: The telescoping pipe (5) constitutes a telescoping handrail for temporary scaffolding (5a), and the bracket (8) is pivotally connected to the extended ends of the large diameter pipe (6) and the small diameter pipe (7). The expansion / contraction tube fixing device according to claim 2, wherein the expansion tube fixing device is provided.

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