JPS60133118A - Anchoring method - Google Patents

Abstract

PURPOSE:To easily provide the yielding strength responding to an installation purpose, by a method wherein, after a stretching material is caused to take a U-turn around a load resisting plate, the overall length of which is adjustable through connection of unit bodies, and is inserted into a hole, in which grout is poured, to strech the stretching member for anchring, the stretching member is pulled off. CONSTITUTION:2 sets of load resisting plates 1, which are adjusted to a given length, are located on the same line, and a stretching member 6 is disposed in a condition to make a U-turn around the first set of the load resisting plates 1. After it is confirmed that the stretching member is guided to grooves 22 and 33 in head bodies 2, it is taped in a peripheral groove 34 by means of a band. Thereafter, the stretching member 6 is attached, in a similar manner, to the second set of the load resisting plates 1 by the use of a pad, and the stretching member 6, which is attached to the first set of the load resisting plates 1, is also taped to the periphery of the second set of the load resisting plates 1. Mortar is poured between bedrocks around the load resisting plates 1, and the stretching member is stretched and anchored during curing thereof. Further, after installation purpose is achieved, the stretching member 6 is released from stretching, and the stretching member 6 is then pulled off.

Description

[Detailed description of the invention] The present invention relates to an anchor construction method.

Many sites have adopted the removal anchor construction method, which involves pulling out unnecessary tendons to achieve the purpose of anchor construction and prevent them from becoming underground obstacles.

Among them, there is a TM removal method using a mechanical method to remove tendons.

In this rim berm anchor construction method, as shown in Figure 9.10, a load-bearing plate A made of iron is placed at the bottom of the hole, and a tension member B made of PC steel wire is attached to this load-bearing plate Δ by making a U-turn. It is something.

Then, when the use was completed, the tension material B was turned in a U-turn.
In this construction method, one end of the tension plate A is pulled out, leaving the load-bearing plate A in the ground, and only the tendon B is pulled out.

The above construction method has the following problems in construction.

<A> The proof strength of the anchor increases as the load capacity A and the contact area in contact with the grout material in the hole increase.

However, since the dimensions of the conventional load-bearing plate A are constant, the strength of adhesion to the ground cannot be increased depending on the conditions of the ground.

Exit> After removing the tension material such as PC steel wire, the load-bearing plate A remains.

The cast iron load-bearing plate A remaining in the hole is a one-piece piece, so when press-fitting a new seat panel C, etc., the tip of the seat panel C may hit, forcing the press-fitting position to be changed, and other It becomes an obstacle to work. (Fig. 10) The present invention has been made in view of these points, and provides an anchor construction method that can easily obtain a strength suitable for the purpose of construction, and furthermore, does not have a negative impact on other works. The purpose is to do.

That is, in the present invention, a hole is drilled in the planned ground, a bullet-shaped load-bearing plate whose total length can be adjusted by connecting rectangular units is inserted into the hole by making a U-turn, and grout is inserted into the hole. This relates to an anchor construction method characterized by injecting, tensioning and fixing the tendons, and then pulling out the tendons.

Next, an embodiment of the present invention will be described, but first a load-bearing plate will be described.

[A1 Load-resistant plate The load-resistant plate 1 is a bullet-shaped single unit as shown in FIG. 1, and is composed of a head body 2 and a body 3.

[Mouth] Head body The head body 2 is hemispherical and is made of cast iron or the like with high compression strength.

The bottom surface 21 of the head support 2 has a connecting rod 4 for connecting it to the body 3.
to protrude.

Furthermore, two guide grooves 22 are provided in the circumferential surface of the head body 2, intersecting at the apex of the head body 2.

The guide groove 22 is formed with a curved surface having the same diameter as the tendon material 6 so as to prevent the tendon material 6 from being crushed when the tendon material 6 is pulled out and removed.

The depth of the guide groove 22 is formed to such a degree that the tendon material 6 does not protrude from the outer ring of the head body 2 when the head body 2 is viewed from the side.

Then, in order to completely prevent the tension material 6 from falling off from the head body 2 and to prevent the bent portion of the tension material 6 from bending into a V-shape, a hole 23 is made at the top of the head body 2. A bottle 24, a bolt, etc. are passed through the bottle hole 23 and installed. (4th
Figure) [C] The fuselage body 3 is a rectangular cylindrical body, and is molded from resin concrete or the like.

A connecting hole 32 for connecting with the connecting rod 4 is formed in the end surface 31 of the body 3.

Four storage grooves 33, which are shifted by 90 degrees, are recessed in the circumferential surface of the body 3 in the longitudinal direction in parallel with the central axis.

Furthermore, a plurality of circumferential grooves 34 are provided in the circumferential direction of the circumferential surface of the body 3.

The load-bearing plate 1 according to the present invention is characterized in that the entire length of the load-bearing plate 1 can be adjusted by connecting the body 3.

To connect the new body 3, you can use the connecting rod 4 used to connect the head body 2 or use adhesive, but it is important to make the connection between the bodies 3 strong. Rather, the tension members 6 are pulled out and connected to the extent that they can be separated when an external force is applied to the finished load-bearing plate 1.

Since it is easy to assemble and disassemble, the load-bearing version 1
The total length of can be easily adjusted by connecting the body 3 according to the construction conditions.

[2] Tensile material The tendon material 6 is, for example, an unbonded PC strand formed by covering a wire of known PC steel with a thin coating material.

Next, the construction method will be explained.

[B] Drilling A hole is drilled to the planned depth in the planned ground using a known drilling method, leaving the casing pipe in the hole.

101 Insert the grout hose to the bottom of the mortar injection hole and inject mortar.

[Insert box anchor material Two sets of load-bearing plates 1 are formed by adjusting the total length to a predetermined length on site.

These two sets of load-bearing plates 1 are arranged on the same line, and first, the tendons 6 are placed in a U-turn on the first set of load-bearing plates 1, and the tendons 6 are guided in predetermined grooves 22, 33. After confirming this, tape the circumferential groove 34 with pando. (
(Fig. 8) Similarly, attach a new tension member 6 to the second set of load-bearing plates 1 using a band.

At this time, the first coarse load-bearing plate 1 is placed on the circumferential surface of the second-grain load-bearing plate 1.
Tension material 6 attached to the holder is also tabbed.

That is, the tension members 6 that are engaged with both load-bearing plates 1 are attached at positions shifted by 90 degrees.

The anchor hole thus formed is inserted into the hole.

In addition, there are cases where one set of load-bearing plate 1 is used instead of two sets.

[21 Pressure injection of mortar (Fig. 5) In order to fill a wide range of mortar into the ground surrounding the load-bearing plate 1, mortar is pressurized in the same way as in the conventional construction method.

[E] Tension and fixation of anchor material During the mortar curing period, tension is fixed using a tensioning tool.

[Removal of Tensile Materials 1] When the purpose of construction is achieved, the tension in the tendons 6 is released by the established tension.

Next, one side of each tension member 6 is pulled to remove the tension member 6 that is locked to each load-bearing plate 1.

As a result, only the load-bearing plate 1 consisting of rectangular divided bodies remains underground. (Fig. 6) Therefore, even if the sheet panel 7 is cast into the ground where the load-bearing plate 1 remains, if the tip of the sheet panel 7 hits the load-bearing plate 1, the load-bearing plate 1 will separate or the concrete will not have tensile force. Since it is small, there is no need to worry about breaking it into small pieces that will prevent the panel from entering.

(Fig. 7) The load-bearing plate 1 remaining underground in this way easily splits into individual pieces, and the condition is the same as that of boulders existing underground, so the sheet panel 7 must be press-fitted. Work can proceed smoothly without worrying about adversely affecting other work.

Since the present invention is as explained above, the following effects can be expected.

<A> The total length of the load-bearing version can be adjusted by simply connecting the fuselage.

Therefore, it is possible to obtain sufficient yield strength according to the conditions of the ground.

Therefore, it can be used even in sites with poor soil, where it was previously difficult to obtain sufficient strength even if anchors were driven into multiple locations.

<Exposure> The load-bearing slab is made up of connected rectangular units, so even if the tension material is removed and the load-bearing slab remains underground, it will easily separate when external force is applied.

Therefore, even if the load-bearing slab is left underground, it will not interfere with other work.

<C> The head and body forming the load-bearing plate have a simple shape and are suitable for mass production.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of an embodiment of the load-bearing plate. Figure 2: An explanatory diagram of the cross section ■-■ in Figure 1. Figure 3: An explanatory diagram of the cross-section ■-■ in Figure 1. Figure 4: Load-bearing plate. Installation of tendons at the apex tip of the plate is illustrated in Figures 5-7, an explanatory diagram of the installation method, Figure 8: An explanatory diagram of the load-bearing plate consisting of multiple bodies, and Figures 9-10.
Figure: Illustration of conventional construction method 1: Load-bearing plate 2: Head Body 3: Body 4: Connection rod 6: Tensile material 22: Guide groove 33: Storage groove

Claims (1)

[Claims] A hole is drilled in the planned ground, and inside the hole a bullet-shaped load-bearing plate whose overall length can be adjusted by connecting rectangular pieces is inserted in a U-turn. Anchor construction method characterized by injecting grout, tensioning and fixing the tendons, and then pulling out the tendons.