JP2563320Y2 - Fixing device for earth retaining plate anchor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for an anchor for anchoring a ground plate, which supports a ground plate arranged upright along a ground excavation surface on the ground.

[0002]

2. Description of the Related Art In the construction work of a structure or a building, when excavating the ground and proceeding with the construction inside the ground, it is necessary to prevent the excavation surface from being collapsed by retaining a soil.

[0003] Among various construction methods known as earth retaining means, the earth anchor method, which is one of the self-supporting earth retaining methods, is to form an anchor hole in a ground from an excavated surface and fix an anchor body at the bottom of the hole. The anchoring body is connected to a tension strip that penetrates through the anchor hole and is fixed to the surface of the earth retaining plate that stands upright along the excavation surface. Good retention and high safety,
(Japanese Patent Publication No. 48-274)
No. 14).

[0004] The tension wire is made of a stranded wire, a bundle wire or a rod wire, and a nut is attached to a screw portion provided at a terminal protruding from an anchor hole through a soil retaining plate and a pedestal attached to the surface thereof. The soil retaining plate is supported and fixed with a force equal to or higher than the collapse pressure of the soil, by being screwed or by being driven into the terminal to be tensioned to a high tension state.

[0005] That is, when the tension wire is a stranded wire, a screw portion is provided by attaching a bolt to an end thereof, and when the wire is a rod wire, a screw portion is provided by threading the end thereof. Depending on the anchoring position of the anchor, the length of the anchor may reach several meters, so that it is extremely troublesome to handle when forming a thread at a factory.

[0006] Also, a bundle of a number of strands is used in parallel as a tension wire, and its ends are expanded and inserted into a metal fitting stacked on the surface of a pedestal, and a wedge is driven into the metal fitting. In some cases, the earth retaining plate is supported and fixed by making the wire stick to the gap between the hole and the wedge, but since the wedge is driven in the direction of pushing the tension wire into the hole, the terminal is pulled and tensioned It is necessary to drive the wedge while maintaining the condition, and the work on site is extremely troublesome, and it is practically impossible to firmly fix the earth retaining plate.

[0007]

[Problems to be Solved by the Invention] As described above, in the earth anchor method, the end of a tension wire, which is prevented from coming off by an anchor body fixed in the ground, is fixed to the surface of the earth retaining plate by being tensioned and fixed. However, in the method of maintaining a high tension state with a nut, it is extremely troublesome to provide a threaded portion on a long tension wire, and the high tension state is difficult. The problem to be solved by the present invention is that it is practically impossible to generate a high tension by the method of generating and maintaining wedges.

[0008]

According to the present invention, there is provided an anchor body which is fixed from the excavation surface to the bottom of an anchor hole formed in the ground, and which is connected to the anchor body, penetrates through the anchor hole and extends along the excavation surface. In order to solve the above-mentioned problem of having the earth retaining plate anchor composed of the tension wire body fixed to the surface of the upright earth retaining plate, an external screw cylinder is used to fix the tension wire body to the surface of the earth retaining plate. And a base through which the tensioning wire is inserted, a spacer nut screwed into the outer screw cylinder, and a guide body having a conical hole having a smaller diameter toward the base and superposed on the outer end surface of the spacer nut. And a plurality of claw pieces which have an inclined outer surface having the same inclination angle as the conical hole and which are fitted into the conical hole and bite the tensile striatum.

[0009] By adopting such a fixing device, a stranded wire, a bundled wire,
The object of easily tensioning a high tension state and firmly fixing the earth retaining plate is achieved with any of the rods and the drawn filaments.

[0010]

[Function] The base is placed directly on the surface of the retaining plate or on the surface of the pedestal attached to this surface, and the spacer nut is fully screwed into the outer screw cylinder. The guide body is placed on the outer end face of the spacer nut, and the claw piece is driven into the conical hole to press the inner surface of the guide member against the tension wire. Next, turning the spacer nut in the direction of pulling out of the outer screw cylinder and moving the guide body in the direction away from the base causes the tension wire strung by the claw piece to be pulled and becomes in a high tension state. The base presses and fixes the earth retaining plate to the excavation surface by the force.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 shows an example of an earth retaining method by an earth anchor method using a fixing device 1 of the present invention. An anchor hole 4 is formed obliquely downward, and the earth retaining plate 5 is formed.
The window hole 6 is aligned with the anchor hole 4 so as to stand upright along the excavated surface 2, and the tension wire 7 is inserted from the window hole 6 into the anchor hole 4 until the tip reaches the hole bottom, and the concrete is placed on the hole bottom. By injecting and solidifying, the distal end of the tension wire 7 is embedded and connected to the anchor body 8 made of concrete mass, and the base end is fixed to the surface of the earth retaining plate 5 via the pedestal 9 by the fixing device 1. The earth retaining plate 5 is supported and fixed by a force higher than the collapse pressure of the ground 3.

FIGS. 2, 3 and 4 show the fixing device 1 shown in FIG.
In this embodiment, an outer screw cylinder 13 is integrally formed on a disc-shaped pressing piece 12 superposed on the surface of a base 9 and has an insertion hole 14 penetrating the center of the base.
The spacer nut 16 is screwed into the outer screw cylinder 13 by engaging the thread 17 of the spacer nut 16 whose outer peripheral surface is polygonal with the thread 15 of the outer screw cylinder 13.

The spacer nut 16 has a length substantially equal to that of the outer screw cylinder 13, and a cylindrical guide 18 is superimposed on the outer end face opposite to the pressing piece 12. The guide body 18 has a conical hole 19 that penetrates back and forth, which gradually decreases in diameter toward the base 11.

Two claw pieces 20 each having a semicircular end face are used. When they are arranged side by side with the inclined outer surface 21 having the same inclination angle as the inclination of the conical hole 19 without any gap in the circumferential direction, the tension wire is used. Inner surface 22 forming a hole slightly smaller than the diameter of 7
And are bundled by an elastic ring 25 fitted into a groove 24 on the outer peripheral surface near the large-diameter side end surface 23.

In this embodiment having such a structure, the insertion hole 14 is inserted from the end into the tension wire 7 from the end thereof while the spacer nut 16 is fully screwed into the outer screw cylinder 13, and the pressing piece 12 is seated. Then, the conical hole 19 of the guide 18 is inserted into the tension wire 7 from the end thereof, and overlaps the base 11 on the outer end surface of the spacer nut 16. Further, the two claw pieces 20 are expanded and fitted to the tension wire 7 and the small diameter side is fitted to the conical hole 19 (FIG. 2).

When the nails 20 are assembled to the tension wire 7 in this manner, the large-diameter end faces 23 of the two nails 20 are alternately hit with a hammer, a power driving tool, or the like, so that the nails 20 are hit into the conical holes 19. Then, as the inclined outer surface 21 moves in the small diameter direction along the conical hole 19, the two claw pieces 20 approach each other, and the inner surface 22 comes into pressure contact with the tension wire 7 and bites.

Then, when the claw piece 20 is sufficiently bitten by the tension wire 7, the spacer nut 16 is turned in a direction of being pulled out from the outer screw cylinder 13 by using a tool such as a wrench to guide the guide 1.
8 is moved away from the base 11, the claw 2
The tension wire 7 bitten by 0 is pulled to be in a predetermined high tension state, and the reaction force is a force pressing the base 11 to the pedestal 9 via the claw piece 20, the guide body 18 and the spacer nut 16. (FIG. 3).

As described above, the earth retaining plate can be pressed and fixed to the excavation surface by the pressing force of the base 11 against the pedestal 9, that is, the tension of the tension wire 9, thereby preventing the soil from collapsing.

Further, the spacer nut 16 is connected to the outer screw cylinder 13.
By pulling the claw piece 20 from the guide body 18 by lowering the tension by screwing it into the guide wire 18, the claw piece 20 can be separated from the tension wire 7.

In this embodiment, an appropriate number of filaments made of a reinforced synthetic resin containing fibers and having a diameter of about 6 mm are used as the tension filaments 7, and the claw pieces 20 are used as the tension filaments 7.
Is compressed and bitten, but it may be a metal that is conventionally used in general. In that case, it is preferable to provide a knurl for biting on the inner side surface 22 of the claw piece 20. preferable. In this embodiment, the number of the nail pieces 20 is two, but it is needless to say that the number of the nail pieces 20 may be three or more.

[0021]

[Effects of the Invention] According to the present invention, the tension wire is fixed to the guide by the wedge action of the claw surrounding the tension wire and the tension wire, and the spacer nut is turned in the direction of extracting the spacer nut from the base. Since the guide body is moved to bring the tension line into a predetermined high tension state, it is easy to perform without any processing such as providing a screw at the end of the tension line and regardless of its material and structure. The earth retaining plate can be pressed against the excavation surface and firmly fixed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an earth retaining method by an earth anchor method.

FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention before tension.

FIG. 3 is a longitudinal sectional view showing the embodiment of the present invention after tension.

FIG. 4 is a left side view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 7 Stretching wire body 11 Base 13 Outer screw cylinder 14 Insertion hole 16 Spacer nut 18 Guide body 19 Conical hole 20 Claw piece 21 Inclined outer surface

Claims (1)

(57) [Scope of request for utility model registration] An anchor body fixed to the bottom of an anchor hole formed in a ground from a digging surface, and an earth retaining plate connected to the anchor body, penetrating through the anchor hole, and standing upright along the digging surface. A fixing device for fixing the tension wire to a surface of the earth retaining plate, comprising: an outer threaded cylinder; A base to be inserted, a spacer nut screwed into the outer screw cylinder, a guide body having a conical hole having a smaller diameter toward the base, and being superimposed on an outer end surface of the spacer nut, the conical hole And a plurality of claw pieces which are fitted into the conical hole and bite the tension striatum.