JPS5919083Y2 - base jack - Google Patents

Description

[Detailed explanation of the idea] This project concerns the improvement of the base jack.

The base jack is essential for scaffold assembly,
Although it has been widely used in the past, when finishing waterproofing on rooftops, places with waterproof retaining layers, atrium stages, and floors of stairs with mortar, etc., these scaffolds must be dismantled once and the floor finishing finished. It is customary to reassemble it after it has been removed.

This is because if the part of the base jack used for assembling the scaffold is left in the dead hole, the hole will be approximately 20 cm square in size, which is unfavorable in terms of appearance, and requires a lot of work to ensure horizontal accuracy and repair the hole. This is because it costs time and money.

Furthermore, when fixing the base jack to an inclined surface, anchor bolts must be driven into two to four points to fix the base jack, which requires a lot of time and effort.

The present invention was proposed in order to eliminate such defects, and the lower end of the base jack main shaft 1 is provided with a tapered portion 2 whose diameter gradually decreases as it reaches the lower end. A female threaded hole 3 extending along the axis of the main shaft 1 and opening at the lower end surface of the tapered part 2 is provided, and a base plate fitted to the outer circumferential thread of the main shaft 1 so as to be movable up and down. The present invention relates to a base jack characterized in that it is formed by threading an adjusting nut 5 mounted on the base jack.

A connecting pipe 6 is integrally protruded or welded to the lower part of the adjusting nut 5, and the lower end edge of the connecting pipe 6 is welded to the base plate 4.

In the figure, 7 is an operating handle for the adjustment nut 5, and 8 is a plug detachably fitted into the female threaded hole 3.

In addition, conventional base jacks have drawbacks such as a large play when a single pipe is inserted from the upper end of the main shaft because the main shaft is thinner than the diameter of the single pipe.

In the illustrated base plate, a pipe 10 is installed concentrically with the main shaft 1 on an adjustment nut 9 screwed onto the main shaft 1,
A single pipe inserted into the main shaft 1 is held between the main shaft 1 and the pipe 10 to prevent rattling.

In the figure, reference numeral 11 indicates an operating handle for the adjustment nut 9.

Since the base jack according to the present invention is configured as described above, when it is used for indoor floor finishing, the base plate 4 is lowered to the lower end of the tapered part 2 of the main shaft 1 by operating the adjustment nut 5, and the base plate 4 is Set the base plate 4 at a predetermined position on the floor A (see Figure 2A), then operate the adjusting nut 5 to raise the base plate 4 along the main axis 1 (see Figure 2B), and then place the floor in this state. A floor finish is applied on A, and the tapered part 2 at the tip of the main shaft 1 is buried in the floor finish part B.

(See FIG. 2C) Next, after the floor finishing part B is cured, the base plate 4 is seated on the floor finishing part B by operating the adjusting nut 5.

(See Figure 2D) Next, the scaffolding is dismantled and the base jack is removed. (See Figure 2E) The hole C in the floor created after removing the base jack is repaired.

(See Figure 2F) At this time, the floor hole C is the base jack main shaft 1.
Since it is formed by a tapered portion 2 provided at the lower end of which the diameter gradually decreases as it reaches the lower end, it has an extremely small diameter and can be repaired extremely easily.

Note that a in the figure represents a single tube. Next, when using the base jack of the present invention on a rooftop scaffolding, set the base jack at a predetermined position on the rooftop in the same manner as in Figure 2A (see Figure 3A), and then tighten the adjustment nut 9 on the top along the main axis 1. At the same time, the entire base jack is lifted up and a waterproof layer is applied.

At this time, the base jack is replaced one by one.

E in the figure is a waterproof material.

(See Figure 3B) Next, place the receiving block F on the waterproof material E, lower the base jack onto the receiving block F, and raise the upper adjustment nut 9 along the main shaft 1 to its original position.

(See Figure 3C) In the case of pouring concrete, press the adjustment nut 5 to raise the base plate 4 along the main axis 1 and place the concrete G. (See Figure 3D) After hardening, operate the adjusting nut 5 to lower the base plate 4 along the main shaft 1,
Place it on the holding concrete G.

(See Figure 3E) Next, after the scaffolding is dismantled, the base jack is removed and the hole H in the holding concrete G that was created after the lower end tapered part 2 of the upper shaft 1 was removed is repaired.

(See Figure 3F) In this case, hole H in holding concrete G
As in the case described above, since the diameter is extremely small, repair work can be performed extremely easily.

Next, when using the base jack of the present invention on a slope ■ or a place that bears horizontal force, anchor the anchor hardware J on the slope I as shown in Figure 4, and attach the anchor bolt installed on the anchor metal J to the base jack. By screwing into the tapered part 2 at the tip of the main shaft 1 a female screw hole 3 extending in the axial direction of the main shaft 1 and opening at the lower end surface of the tapered part 2, the base jack can be kept in a stable state. It can be set with .

Figure 5 shows the base jack of the present invention used for stair scaffolding, and is used both as formwork support and scaffold assembly.

As described above, the base jack according to the present invention is provided with a tapered part 2 at the lower end of the main shaft 1, whose diameter gradually decreases as it reaches the lower end, and on the outer peripheral thread of the main shaft 1, it can be raised and lowered by the upper shaft 1. Since the adjusting nut 5 mounted on the base plate 4 is screwed on, the base plate 4 can be raised along the main shaft 1 by operating the adjusting nut 5 when finishing floors or waterproofing rooftops. Then, by performing the required finishing and waterproofing work while supporting only the tapered part 2 on the floor surface of the room or rooftop, the tapered part 2 is formed on the finished part of the floor or the waterproof layer on the rooftop. Most of the damage is extremely small and repair is extremely easy, so the floor surface is finished and the roof waterproofing layer is installed while the base jack and the scaffolding supported by it are left in place. Since the tapered portion 2 is provided with a female threaded hole 3, when used on an inclined surface or a place where horizontal force is applied, the anchor bolt anchored at the place is inserted into the female threaded hole 3.
By screwing it onto the base jack, the base jack can be easily fixed with a single anchor bolt.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional front view of the left half of the base jack according to the present invention, Figures 2A to 2F are explanatory drawings of the construction process when the base jack according to the present invention is used for indoor floor finishing, and Figure 3A
Figures 3F to 3F are explanatory diagrams of the construction process when the base jack of the present invention is used for rooftop scaffolding, Figure 4 is a side view showing the case where the base jack of the present invention is used on a slope, and Figure 5 It is a side view which shows the case where such a base jack is used for a stair scaffold. 1...Main shaft, 2...Taper part, 3.
...Female screw hole, 4...Base plate,
5...Adjustment nuts.

Claims (1)

[Claims for Utility Model Registration] A taper portion 2 whose diameter gradually decreases as it reaches the lower end is provided at the lower end of the base jack main shaft 1, and the taper portion 2 extends along the axis of the main shaft 1). A female threaded hole 3 extends and opens at the lower end surface of the tapered portion 2.
A base jack characterized in that an adjustment nut 5 on which a base plate 4, which is fitted to the upper shaft 1 so as to be movable up and down, is screwed onto the outer peripheral thread of the main shaft 1.