JP2000017833A - Long jack for framework scaffolding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a framework scaffolding long jack capable of stably bearing the framework scaffolding with a simple structure. SOLUTION: An internal pipe 12 is freely fitted to an external pipe 11 screwing a male screw in the circumference of the upper end in a state to come in and out. Open holes 21 passing through an internal pipe bearing pin 22 are bored into the internal pipe 12 at a specific interval along the longitudinal direction of the internal pipe 12. A longitudinal slot 16 passing through the internal pipe bearing pin 22 is bored into a part of the male screw 14 of the external pipe 11. The open-hole to be required of the internal pipe 12 is made to coincide with the longitudinal slot 16 of a part of the male screw 14 in an inserted state to pass through the internal pipe bearing pin 22, and the internal pipe bearing pin 22 is borne on an adjusting nut 18 screwed in a part of the male screw 14. A stud bracket 25 for holding the lower part of a stud of a framework scaffolding is provided to the upper end section of the internal pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long jack for a frame scaffold used to hold a lower end portion of a frame scaffold horizontally when assembling the frame scaffold at a place where a step or a height difference is large.

[0002]

2. Description of the Related Art In the construction work of a building, a temporary scaffold is formed by stacking framed scaffolds in close proximity to the building in a number of stages according to the height of the building. At this time, it is necessary to keep the part in contact with the ground at the bottom of the framework scaffold horizontally, and when there is little height difference on the ground, a jack for height adjustment called a jack base is often used,
If the steps or height differences are large, such as stairs or sloping terrain, the adjustment height is insufficient with the jack base,
A jack support having a large adjustment height as disclosed in Japanese Patent Application Laid-Open No. 9-88330 has been proposed.

As shown in FIG. 7, this jack support 1 has a cylindrical insert 3 having a height adjusting hole 2 and serving as a support.
A male screw 4 is engraved on the outer peripheral portion, a vertically long hole 5 is formed, and an adjusting nut 6 is screwed onto the cylindrical body 7 to be inserted into the cylindrical insert 3. When supporting a framed scaffold, a pillar a of the framed scaffold is attached to the pillar support 8 and the cylindrical body 7 is moved along the cylindrical insert 3 when supporting the framework scaffold. The height difference is adjusted by sliding up and down, and the support rod 9 is inserted into the vertically long hole 5 of the cylindrical body 7 and the adjusting hole 2 of the cylindrical insert 3.
The support rod 9 receives the adjustment nut 6 screwed to the male screw 4 of the cylindrical body 7 to adjust and support the height difference of the framework scaffold.

[0004]

However, in the above-mentioned conventional jack support, the cylindrical insert 3 serving as a support portion is provided.
When the pillars a of the framework scaffold are supported by the pillar supports 8, since the axes of the pillars and the pillar supports 8 supporting the pillars a of the framework scaffold are parallel but eccentric, The cylindrical body 7 and the cylindrical insert 3 to which the portion 8 is fixed receive the load of the framework scaffold as an eccentric load not from directly above but from the side. This causes more friction than necessary between the cylindrical body 7 and the cylindrical insert 3, so that the vertical sliding of the cylindrical body 7 requires more force than necessary. In addition, the cylindrical insert 3 tends to be constantly inclined toward the pillar support portion 8 side, and it is necessary to reinforce it with roots and connecting materials.

[0005] In view of the above, the present invention has a simple structure,
An object of the present invention is to provide a long jack for a framework scaffold that can stably support the framework scaffold.

[0006]

According to the present invention, there is provided a long scaffold for a scaffold according to the first aspect of the present invention. The inner tube is loosely fitted in the tube so as to be able to protrude and retract, and through holes are formed at predetermined intervals along the longitudinal direction of the inner tube so that the inner tube support pins penetrate into the inner tube. A vertically long hole through which the inner tube support pin penetrates is formed in the portion, and the inner tube support pin is penetrated by inserting the vertically long hole of the outer tube into a desired through hole of the inner tube in a penetrating manner. The height of the support pin is adjustable by supporting the support pin with an adjusting nut screwed onto the male screw portion, and a pillar support for receiving the pillar of the framed scaffold is provided at the upper end of the inner tube.

In the long jack for a framed scaffold according to claim 2, the pillar supporter is an insertion pin inserted into a pillar of the framed scaffold, and is fixed to an outer peripheral portion of the insertion pin. And a collar body for receiving the color.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a long jack for a scaffold according to the present invention; FIG. 2 is a perspective view of a long jack for a scaffold according to the present invention; A receiving device is provided. Then, when adjusting the height of the long jack, slide the inner pipe with respect to the outer pipe so that the through hole at the desired position of the inner pipe and the vertical hole at the upper end of the outer pipe coincide with each other so that the inner pipe support pin is inserted. The inner tube support pin is supported by an adjusting nut screwed onto a male screw portion of the outer tube to roughly adjust the height. Fine adjustment of the height after fixing the long jack and supporting the pedestal of the framework scaffold by the pedestal support at the upper end of the inner tube is performed by rotating the adjustment nut.

Thus, the long jack of the present invention
Since the outer pipe and the inner pipe that can freely move in and out of the outer pipe are provided, and a pillar support for supporting the pillars of the framework scaffold is provided at the upper end of the inner pipe, the long jack is capable of reducing the load of the framework scaffold. Pipes and outer pipes receive linearly from directly above, no eccentric load is applied, there is no inclination due to the load of the framework scaffolding, and the adjustment nut can be easily operated and workability is improved. good.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a long jack 10 according to the present invention, which comprises an outer tube 11 and an inner tube 12 which can be inserted into and retracted from the outer tube 11. A base plate 13 is provided at the lower end of the outer tube 11.
At the upper end, a screw tube 15 having a male screw 14 formed thereon is joined and integrated, and the screw tube 15 is provided with a vertically long hole 16. Further, the screw tube 15 is provided with a handle 17 for turning, and is screwed with an adjustment nut 18 having a flat upper surface.

A pair of brace pins 19 are provided on the side of the outer tube 11 so as to project vertically.
When the long jacks 10 are juxtaposed, a brace 20 for connecting and fixing adjacent long jacks is attached.

The inner tube 12 has a through hole 2 along its longitudinal direction.
1 are drilled at predetermined intervals, the desired through-holes 21 of the inner tube 12 and the elongated holes 16 of the outer tube 11 are inserted into the insertion tube so that the support pins 22 penetrate therethrough. Support pin 2
2 is supported by the upper surface of the adjustment nut 18. The inner tube support pin 22 is connected to a ring 23 attached to the inner tube 12 by a chain 24 so as not to be lost.

Further, at the upper end of the inner tube 12, a pillar support 25 for receiving the pillar of the framework scaffold is provided. The pedestal support 25 may have any structure capable of supporting the pedestal of the framework scaffold. For example, as shown in FIG. 3, an insertion pin 26 to be inserted into the pedestal of the framework scaffold, and an insertion pin 26 A lower end of the insertion pin 26 is inserted into the upper end of the inner tube 12, and a through hole 2 is formed in the lower end of the insertion pin 26.
8 and the mounting holes 29 formed in the upper end of the inner tube 12 are aligned in an insertion manner, the mounting pins 30 are inserted into these holes, and the retaining pins 31 are inserted into the ends of the mounting pins 30. Attach.

In addition, as shown in FIG. 4, the mounting method of the pedestal support 25 is such that the projection 32 is projected toward the inside of the upper end of the inner tube 12 without being mounted by the mounting pin 30 as described above. At the same time, the lower end of the insertion pin 26 is recessed in an inverted L-shape to form a recess 33, and when the projection 32 comes to the horizontal portion of the recess 33 by rotating the insertion pin 26, it is locked. A structure may be adopted in which the protrusion 32 can be removed when the protrusion 32 comes to the vertical portion of the recess 33.

Next, an example of assembling a framed scaffold at a step with the above-mentioned long jack will be described with reference to FIGS.

First, well-known jack bases B are juxtaposed on the ground with a high step at intervals at which the framework scaffold A is installed. In addition, a long jack 1
0 are juxtaposed at the same interval as the jack base B, and as shown in FIG. 6, the brace pins 19 of the adjacent long jacks 10 are crossed with braces 20 so that the long jacks 10 become independent. Then, the height of the mounting portion of the jack base B is adjusted to be horizontal, and the height of the pillar receiving members 25 of the long jack 1 is also adjusted to be horizontal.

In order to adjust the height of the pillar support 25 of the long jack 10, first, the male screw 1 of the outer tube 11 shown in FIG.
The adjustment nut 18 screwed to the screw 4 is rotated by the hand-turning handle 17 and lowered to the lowermost part of the male screw 14.

Next, the inner tube support pin 22 is pulled out, and the inner tube 12 is removed.
Is adjusted so that the upper surface of the collar body 27 of the pillar support 25 is slightly lower than the upper surface of the lifting nut C of the jack base B disposed on the ground side with a high step shown in FIG. And the elongated hole 1 in the male screw 14 of the outer tube 1
6 and the through-hole 21 of the inner pipe 13 are inserted into the inner pipe support pin 22 so as to penetrate the same, and the inner pipe support pin 22 is inserted into the adjustment nut 1.
The height of the inner tube 12 is roughly adjusted by being supported on the upper surface of the inner tube 8.

Next, when the adjusting nut 18 is rotated by the hand-turning handle 17, the adjusting nut 18 is moved up and down, and
2 can be finely adjusted.
The upper surface of the collar body 27 is adjusted to be substantially the same height as the upper surface of the lifting nut C of the jack base B on the ground side with a high step.

Jack base B and long jack 10
After the height adjustment is completed, the pillar of the framework scaffold A is attached between the jack base B and the long jack 10. At this time,
On the jack base B side, the pillar of the framework scaffold A is inserted into the threaded portion of the jack base B main body, and on the long jack 10 side, the pillar of the framed scaffold A is inserted into the pillar receiving member 25 at the tip of the long jack 10. The pillar support 25 includes an insertion pin 26 and a collar body 27, and the lower end of the pillar of the framework scaffold A is inserted into the insertion pin 26 and is supported on the upper surface of the collar body 27.

When the first-stage framework scaffold A is attached to the jack base B and the long jack 10, the respective lifting and lowering nuts C and the adjustment nuts 18 are readjusted to adjust the horizontality of the framework scaffold A. Framework scaffold A
To assemble.

In the long jack 10 supporting the framework scaffold A assembled as described above, the assembled frame scaffold A
Is supported by the collar body 27 of the pedestal support 25, and the load supported by the collar body 27 is the inner pipe 12 and the outer pipe 1.
1, the load is linearly received, no eccentric load is applied, and there is no inclination due to the load of the framework scaffolding, and the adjustment nut can be easily operated and workability is good.

[0024]

As described above, in the long jack for a scaffold according to the first aspect of the present invention, the inner tube is loosely fitted into the outer tube having an external thread threaded on the outer periphery of the upper end so as to be freely retractable. A through hole for penetrating the inner tube support pin into the inner tube is formed at a predetermined interval along the longitudinal direction of the inner tube, and a vertically long hole is formed to penetrate the inner tube support pin into the external thread portion of the outer tube. A hole is bored, the longitudinal hole of the outer tube is aligned with the desired through hole of the inner tube in a penetrating manner, the inner tube support pin is inserted, and the inner tube support pin is screwed into the male screw portion. The height of the scaffold is supported by a nut, and the height of the scaffold can be adjusted. At the upper end of the inner tube, a pillar support for receiving the pillar of the framework scaffold is provided. Without any eccentric load, stable without tilting due to the load of the framework scaffold, and easy operation of the adjustment nut Business property may be.

In the long jack for a scaffold scaffold according to claim 2, the pillar support is an insertion pin inserted into a pillar of the framework scaffold, and the pillar is fixed to an outer peripheral portion of the insertion pin. Since the collar body receives the frame, the structure of the pillar support is simple, and the framework scaffold can be easily attached to the long jack.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a long jack for a framework scaffold according to the present invention.

FIG. 2 is a view taken along line XX of FIG. 1;

FIG. 3 is a perspective view showing a state in which main parts of FIG. 1 are separated.

FIG. 4 is a perspective view corresponding to FIG. 3, showing another embodiment of the main part of FIG. 1;

FIG. 5 is a side view showing a use state of the long jack for a framework scaffold.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a front view showing a conventional jack support.

[Description of sign]

DESCRIPTION OF SYMBOLS 10 ... Long jack 11 ... Outer tube 12 ... Inner tube 14 ... Male screw 16 ... Vertical hole 18 ... Adjustment nut 19 ... Brace pin 20 ... Brace 21 ... Through hole 22 ... Inner tube support pin 25 ... Pedestal support 26 ... Insertion pin 27 ... Color body

Claims (2)

[Claims] An inner tube is freely fitted in an outer tube having a male screw threaded on an outer peripheral portion of an upper end thereof so that the inner tube can freely protrude and retract, and a through hole for penetrating an inner tube support pin into the inner tube is formed along a longitudinal direction of the inner tube. Along with a predetermined interval, a vertically long hole for penetrating the inner tube support pin is formed in the external thread portion of the outer tube, and the vertically elongated hole of the outer tube and the through hole of the inner tube are inserted through. The inner tube support pins are made to penetrate in conformity with each other, and the inner tube support pins are supported by an adjusting nut screwed to a male screw portion so that the height can be adjusted freely. The upper end of the inner tube receives the pillar of the framework scaffold. Long jacks for scaffolding scaffolds, which are equipped with pillar supports. 2. The pedestal receiving device comprises an insertion pin inserted into a pedestal of a framed scaffold, and a collar fixed to an outer peripheral portion of the insertion pin to receive the pedestal. The long jack for the framework scaffold described.