JPH0328535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements to steel foundations installed underground for erecting various signage poles.

A known steel foundation (Fig. 1) consisting of a cylindrical body 21 and a plurality of resistance plates 22 provided around the cylindrical body 21
After the pole 19' is installed in the ground, the root part of the pole 19' is placed inside the hollow cylindrical body 21, and this part is hardened with mortar or quick-drying special cement 24, fixed to a steel foundation, and then erected into the ground. (Figure 2).

In this known steel foundation, when the pole 19' is erected, the following disadvantages arise because the fixing means is solely mortar or quick-drying special cement 24.

When mortar is used, it takes a long time for it to harden, so it is necessary to put a splint 23 on the pole 19' and keep it in a temporary state.
As the construction was temporary, sign boards, etc., which were exposed to wind pressure, could only be installed after the mortar had sufficiently hardened, resulting in a significant loss of work efficiency.

In addition, quick-drying special cement hardens in minutes, so workability is not as bad as with mortar, but it still requires the worker to support the cement for several minutes until it hardens, or to put on simple splints. Moreover, since the materials used were much more expensive than mortar, the overall cost of construction increased.

The present invention was proposed in view of the above-mentioned drawbacks of known steel foundations, and it provides a steel foundation with a function of fixing poles while controlling their erection posture, and ultimately enables the use of inexpensive mortar. The purpose of this invention is to fix the pole, but until the pole is sufficiently hardened, the fixing function can be used to quickly and reliably attach sign boards and the like.

Examples of the present invention will be described below with reference to the drawings.
Figure 4 shows a steel foundation in which a plurality of resistance plates 2 are formed around a cylindrical body 1. Three resistive plates 2 are arranged at equal intervals at the same height below the upper end of the cylindrical body 1. A lock hole 3 is drilled therein.

The lock hole 3 is formed of a circular guide hole 4 and a narrow vertical hole 5 extending below the circular guide hole 4.

Figure 5 shows a pole support fitting 6 made of a steel plate formed into a weight shape, which is inserted into a hollow cylindrical body 1 of a steel foundation installed underground, and the pointed outer peripheral surface 7 is submerged into the soil. After being pushed in and immobilized, the lower end of the pole is received and fixedly supported by the weight-shaped inner circumferential surface 8.

6 to 8 show a fixing nut 9 that can be detachably attached to the lock hole 3, and a fixing nut 9 that can be detachably attached to the lock hole 3.
An insertion protrusion 10 with a thickness that can be loosely inserted into the guide hole 4 is provided, and a locking part 11 thicker than the guide hole 4 is connected to the rear thereof. A fitting groove 12 having a depth and a predetermined width corresponding to the above is cut and formed, and a threaded portion 13 is provided on the inner periphery so that a bolt 14 can pass therethrough.

The present invention thus constructed is first installed by driving it into the ground at a predetermined depth in the same manner as a known steel foundation.

Reference numeral 15 shown in FIG. 9 (resistance plate 2 is omitted) is an impact propagation tool used for driving, in which the lower fitting part 17 is fitted into the cylinder 1, and the upper part of the flange 1 is fitted.
Hit the upper end surface of 6 with a hammer or the like.

The impact of the striking is transmitted to the cylinder body 1 through the collar 16, so by repeating the striking, the lock hole 3 is made of steel to the extent that it will not be buried in the soil as shown in Fig. 10 (resistance plate 2 not shown). Drive the foundation into the ground.

Remove the shock propagation tool 15 from the cylinder 1, turn the screw tool 18 as shown in FIG. After securing the hole, place the pole support fitting 6 at the bottom of the hole in the cylinder 1, and tap it lightly with a hammer or the like to push the outer peripheral surface 7 into the soil as shown in Figure 12 (resistance plate 2 not shown). to become immobile.

Next, the fixing nuts 9 are attached to the lock holes 3 of the cylinder 1, but first the fitting grooves 12
While holding the locking part 11 in a vertical position, insert the protrusion 10 through the guide hole 4 from the outside of the cylindrical body 1 (Fig. 13), and the locking part 11 hits the cylinder 1 and locks. When the insertion groove 12 cut into both sides of the insertion protrusion 10 is moved downward, the insertion groove 12 is locked into the vertical hole 5 (FIGS. 14 and 15).

After the fixing nuts 9 have been installed as described above, put the root of the pole 19 into the cylinder 1, place the lower end on the inner circumferential surface 8 of the pole support fitting 6, and then attach the three fixing nuts 9 to each of the three fixing nuts 9. Screw in the bolt 14, and while checking the upright posture of the pole 19, tighten and fix the pole 19 from three sides using the tip of the bolt 14 (FIGS. 16 and 17...the resistance plate 2 is not shown in FIG. 16).

Even if the cylindrical body 1 is installed at an angle due to operator error or the influence of obstacles contained in the soil during the process of driving the steel foundation, the lower end of the pole base will be attached to the weight-shaped pole support bracket. 6, and its upper part is tightened with bolts from three sides, so it is possible to maintain the upright posture of the pole 19 within the range allowed by the gap between the pole 19 and the cylinder 1, and Even under construction conditions where the upright position of the pole 19 is very strictly regulated, it is only necessary to tighten and adjust each bolt 14 while applying a gauge to the pole 19, and this work is extremely easy and can be done reliably. .

In this way, the pole 19 is fixed to the steel foundation by tightening the three bolts 14, so that a sign board or the like can be immediately attached.

However, if extremely strong external pressure is applied to the pole 19 in this state, in the worst case, the entire load of the external pressure may be applied to a single bolt contact area. Considering the concerns that may occur in the future, such as the fact that the pole will easily deform, and that if stress is applied to the pole due to it coming loose for some reason, the three-point tightening of the bolt 14 will not be able to sufficiently counter this, it is necessary to The most reliable method is to fill the gap between the pole 19 and the cylindrical body 1 with mortar 20 (Fig. 18...resistance plate 2 is omitted) after tightening the pole 19 with the mortar 20. And it's safe.

In short, the effects of the present invention are that the upright posture of the pole 19 to be erected within the above-mentioned tolerance range can be easily adjusted and maintained on the steel foundation installed underground, and that the upright position of the pole 19 can be easily adjusted and maintained until the mortar 20 hardens. The structure enables a temporary construction state in which the pole 19 and the steel foundation can be securely fixed to the extent that even if a sign board or the like is attached to the interpolation pole 19, no support is caused.
Work efficiency has been significantly improved without using expensive materials such as quick-drying special cement.

In addition to the above effects, in the present invention, the three bolts 14 are exposed above the cylinder 1 after construction, so they can be used in place of hooks when pulling out and removing the steel foundation from the ground. There are also advantages other than fixing the pole 19 by attaching the bolt 14.

[Brief explanation of drawings]

The drawings relate to a steel foundation equipped with the fixing function of the present invention, and FIG. 4 is a perspective view of the steel foundation;
FIG. 5 is a perspective view of the pole support fitting. 6 to 8 are a perspective view, a front view, and a side view showing the fixing nut and bolt, respectively. Figures 9 to 18 explain the construction state of the present invention starting from driving the steel foundation, Figures 9 and 10 are side views, and Figures 11 to 14 are partially cutaway views. FIG. FIG. 15 is a front view, FIG. 17 is a plan view, and FIGS. 16 and 18 are partially cut away side views. 1 to 3 relate to a known steel foundation, in which FIG. 1 is a perspective view, FIG. 2 is a partially cutaway side view, and FIG. 3 is a side view. Description, 1... Cylindrical body, 2... Resistance plate, 3... Lock hole, 4... Guide hole, 5... Vertical hole, 6... Pole support fitting, 7... Outer circumference, 8... Inner circumference surface, 9... fixing nut, 10... insertion protrusion, 11... locking part,
12... Fitting groove, 13... Threaded portion, 14... Bolt, 15... Impact transmission tool, 16... Tsuba, 17...
...Fitting part, 18...Screw tool, 19, 19'
...Pole, 20...Mortar, 21...Cylinder,
22... Resistance plate, 23... Splint, 24... Mortar or quick-drying special cement.

Claims (1)

[Scope of Claims] 1. Three lock holes 3 formed from a circular guide hole 4 and a narrow vertical hole 5 connected below the guide hole 4 are drilled at equal intervals at the same height. A fixing device characterized in that it is composed of a cylindrical body 1, a weight-shaped pole support fitting 6 that can be installed in the cylindrical body 1, and a fixing nut 9 and a bolt 14 that can be detachably attached to the lock hole 3. Steel foundation with functions. 2. The fixing nut 9 consists of a small-diameter insertion protrusion 10 with fitting grooves 12 on both sides and a larger-diameter locking part 11 formed at the rear of the insertion protrusion 10, and has a penetrating threaded part on the inner periphery. 13. A steel foundation having a fixing function as set forth in claim 1.