JPH0750417Y2 - anchor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved anchor suitable for use in a large anchor structure.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 9, an expanding guide portion 1a formed at the lower end of a supporting rod 1 is rigidly connected to an expanding guide edge 2a of an arrowhead-shaped base plate 2 by a driving member. In the case of hitting and embedding in the ground, a fixed end portion a between the supporting rod 1 and the substrate 2
An inertial force equivalent to the weight of the supporting rod acts on the supporting rod 1, causing bending stress in the supporting rod 1. In particular, in a large-sized anchor buried deep in the ground, since the supporting rod 1 is long, both inertial force and bending stress are larger than those of a small anchor. However, since this bending stress is very small, when a tool with a high impact force such as a drop hammer is used, the construction is completed with a relatively small number of impacts, and therefore the fixed end portion a due to the bending stress is applied.
No fatigue phenomenon occurred and it was buried without problems. However, in recent years, in order to improve the construction efficiency and make the work compact, portable small vibration driving tools are becoming widespread, and when driving with these small vibration driving tools, the following problems occur. I have something to see. Since the small-sized vibration driving machine has a small striking force, in order to compensate for this, the striking frequency is greatly increased to shorten the construction time. Therefore, according to this construction method, the supporting rod is vibrated and vibrated vertically to increase its inertial force, and the bending stress also increases in proportion thereto. Further, the repetition frequency of both upper and lower amplitude stress is extremely increased. In addition, recently, some of the commercially available small-sized vibration hammering machines have the number of hits exceeding 1000 times per minute, and it is easy to promote the fatigue phenomenon of the supporting rod material due to the above-mentioned double swing stress. If the setting work is continued for a long time on such a hard ground, there may be a case where the rod is broken in the vicinity of the fixed end a.

The object of the present invention is to control only the one-sided swing stress in the driving direction without generating the two-sided swing stress on the supporting rod during the setting and embedding work using the small-sized vibration driving machine. An object of the present invention is to provide an anchor capable of extending the bending fatigue time of the supporting rod to a great extent and rationally preventing the supporting rod from being damaged.

[0004]

In order to solve the problems of the prior art, the structure of the present invention is such that the front shape with the upper edge of both sides as the expansion guide edge has a front shape and the expansion guide edges of the arrowhead-shaped substrate have support rods. A driving member that connects the expansion guide portions that can be formed at the lower end,
An anchor comprising a resistance plate in which the upper parts of two partition plates are fixed and the lower part is releasably coupled, the resistance plate is positioned at a right angle to the substrate, and is slidably fitted to the supporting rod. The expansion guide portion formed at the lower end of the support rod is fixed to the upper end of a connecting plate whose lower portion is loosely coupled to the substrate.

[0005]

Since the expansion guide portion formed at the lower end of the supporting rod is fixed to the upper end of the connecting plate whose lower end is loosely connected to the substrate, the supporting rod inertia force of only one-sided vibration in the board placing direction is fixed. Therefore, the inertial force becomes much smaller than the case where the amplitude is increased by both swings, and the effect of preventing fatigue breakage of the supporting rod is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the embodiments of the present invention will be described with reference to the drawings. 1 is a front view of an anchor in a buried posture with a part omitted, FIG. 2 is a front view with a part of a driving member omitted, FIG. 3 is an enlarged view of a main part of the same, FIG. 4 is a sectional view taken along line AA of FIG. 5 is shown in FIG.
FIG. 6 is a front view of the resistance plate, FIG. 7 is a side view of the resistance plate, and FIG. 8 is a plan view of the same.

The anchor of the present invention comprises a driving member A shown in FIGS. 2 to 5 and a resistance plate B shown in FIGS. 6 to 8. First, the configuration of the driving member will be described with reference to FIGS. 2 to 5. Reference numeral 11 denotes a substrate having a front shape of an arrowhead shape and symmetrically forming a widening guide edge 11a on the left and right of the upper end surface. In the center, this substrate 11
A recessed portion 11b is formed with which the lower end of a driving rod (not shown) that is embedded in the ground is embedded. 12 is the substrate 1
1 is a support rod connected to the upper part of the support rod 1. At the lower end of the support rod 12, an expansion guide portion 12a is formed which is connected to the base of the expansion guide edge 11a of the substrate 11. According to the present invention, the lower surface portion of the expansion guide portion 12a is attached to the substrate 11
On the other hand, the lower part is fixed to the upper end of the connecting plate 13 which is loosely coupled.

As shown in FIGS. 4 and 5, the connecting plate 13 is formed by folding a single steel plate into a U-shaped two-fold structure.
It is configured to sandwich the substrate 11. Further, it is desirable that the connecting plate 13 be in a vertical posture along the longitudinal axis direction of the supporting rod 11. Next, the floating connection structure between the substrate 11 and the connecting plate 13 will be described. As is clear from FIG. 4, the shaft hole 14 formed in the substrate 11 has a diameter smaller than that of the shaft hole 14, and The floating coupling structure is constituted by a pin 15 which is welded at both ends to the connecting plate 13 having the two-fold structure and which is loosely inserted and pivotally supported. A screw portion 12b is formed at the upper end of each of the two parallel supporting rods 12, and the branch bar 1 is attached to the screw portion 12b as shown in FIG.
6 is detachably connected. The driving member A is configured by the above structure. Further, the connecting means of the branch rod 16 to the supporting rod 12 is not limited to the one shown in the figure.

Next, the structure of the resistance plate B will be described with reference to FIGS. Since this resistance plate B is already generally known, a detailed description thereof will be omitted, but the upper portions of the two dividing plates 17 are fixedly coupled to each other so that the lower portions thereof can be detached, and the supporting rod 12 is fitted. And the expansion guide edge 11a of the substrate 11
It is configured by a concave groove 17a that fits in.

The anchor of the present invention comprises a set of a driving member A and a resistance plate B having the above-mentioned structure, and the driving member A excavates a prepared hole 18 in a predetermined ground and After the substrate 11 is driven into the hole 18 with a small-sized vibration hammering tool (not shown) and a hammering rod to a predetermined depth, the resistance plate B is hammered with the rod 12 as a guide. Then, the division plate 17 that constitutes the resistance plate B is
When the expansion guide portion 12a of the support rod 12 is reached, the temporary connection is released, and then the split plate 17 is formed on the expansion guide portion 11a of the substrate 11.
It is unfolded along with the condition shown in FIG.

[0011]

As described above, according to the configuration of the present invention, the following effects can be obtained. The expansion guide part formed at the lower end of the supporting rod is fixed to the upper end of the connecting plate in which the lower part is loosely connected to the substrate, rather than being directly fixed to the upper side of the substrate as in the prior art, so the conventional driving Like the member structure,
Fatigue of the supporting member due to the double swing stress is less likely to occur, and the result is that the supporting shaft inertia force of only one-sided vibration in the substrate placing direction acts on the fixed end portion a. Since it is much smaller than the case where it is increased by the swing, the effect of preventing the fatigue breakage of the supporting rod becomes remarkable, and the supporting rod can be reasonably prevented from breaking even during long-time construction work with a small vibration driving machine. sell.

[Brief description of drawings]

FIG. 1 is a front view of an anchor in a buried posture with a part omitted.

FIG. 2 is a partially omitted front view of a driving member.

FIG. 3 is an enlarged view of a main part of a driving member.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a front view of a resistance plate.

FIG. 7 is a side view of a resistance plate.

FIG. 8 is a plan view of a resistance plate.

FIG. 9 is a partially omitted front view of a driving member of a conventional example.

[Explanation of Codes] A Driving Member B Resistance Plate 11 Substrate 11a Expansion Guide Edge 11b Recess 12 Support Rod 12a Expansion Guide Part 12b Screw Part 13 Connecting Plate 14 Shaft Hole 15 Pin 16 Branch Bar 17 Separation Plate

Claims (1)

[Scope of utility model registration request] 1. A driving member in which an expansion guide edge formed at the lower end of the supporting rod is connected to an expansion guide edge formed on both upper edges of the arrowhead-shaped substrate in a front shape, and an upper portion of two separation plates. An anchor which is fixed and has a lower part releasably coupled to it, the resistance plate being positioned at a right angle to the substrate and slidably fitted to the supporting rod, at the lower end of the supporting rod. An anchor characterized in that the formed expansion guide portion is fixed to an upper end of a connecting plate whose lower portion is movably coupled to the substrate.