JPS62211464A - Construction method of anchor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an anchor construction method.

<Prior Art> There is an anchor construction method in which a group of PC steel wires is housed in a sheath, inserted into a drilled hole, hardened with mortar, etc., and then tensile force is introduced into the group of PC steel wires.

Problems to be Solved by the Present Invention In the conventional method described above, mortar is injected into the inside and outside of the sheath to fix the PCl3 wire to the ground or bedrock.

For this purpose, two injection pipes are placed along the PC steel wire group, and mortar is injected into the outside of the sheath from one of them, and once the mortar has risen to the hole opening, the other A construction method is adopted in which mortar is injected into the sheath through an injection pipe. Alternatively, a method may be used in which mortar is injected into the inside of the sheath and then into the outside of the sheath.

In any case, there are two injection pipes in the PC steel wire group, but this has the following disadvantages.

B) It takes a lot of effort to line up a large number of PCJI line groups in parallel orderly, insert them into the sheath, and set them, but on top of that, storing two injection hoses is extremely troublesome work.

Exit: In order to arrange two injection hoses side by side, the outer diameter of the sheath becomes large.

<C> For other piles that are particularly prone to collapse, the method is to insert the casing into the hole, set the PC steel wire group, or insert it and then pull out the casing without injecting the anchor grout. adopt.

However, since the difference between the inner diameter of the casing and the outer diameter of the sheath is small, if the outer diameter of the sheath is large, the anchor will also be pulled out as the casing is pulled out.

(2) In order to avoid such inconvenience, the diameter of the hole must be made large.

However, enlarging the diameter of the hole to be filled and backfilled with mortar is extremely uneconomical and wasteful work.

Moreover, this requires larger drilling equipment, longer drilling time, and
Wear and tear of equipment cannot be avoided.

OBJECTS OF THE INVENTION The present invention has been made to improve the above-mentioned drawbacks, and an object thereof is to provide the following anchor construction method.

C> A method that makes it easy to assemble the PC steel wire group and the injection hose.> A method that allows the outer diameter of the anchor cable to be smaller than the conventional one when the pcisma and injection hose are set. <C> Drilled hole diameter Structure of the present invention using a construction method that can make the size smaller than that of conventional methods> Next, an embodiment of the present invention will be described.

Structure of anchor In Fig. 1, 1 is a PC steel wire, and a large number of PCmj
Group II is integrally formed using spacers and binding wires.

A sheath (corrugated sheath in the illustrated embodiment) 2 is located around the outer periphery of the first group of PC steel wires to protect the first group of PC steel wires.

The distal end of the sheath 2 is closed with a bottom cap 3 to partition the inside and outside of the sheath 2.

The above configuration is already known.

Mouth> Grout hose Position only one grout hose 4 along the first group of PC steel wires.

The base end of this grout hose 4 is exposed outside the hole, and that side is connected to a grout pump or the like.

On the other hand, the tip of the ground hose 4 penetrates the bottom cap 3 and projects to the outside thereof.

As shown in FIG. 6, a discharge port 41 is opened at one or more locations in the middle of the grout hose 4, and its outer periphery is covered with a band-shaped rubber ring 42 or the like. Therefore, only when pressure above a certain level is applied to the grout material, the band-shaped rubber ring 4
The grout material is pushed out from the discharge port 41 by pushing the grout 2 apart.

C. Closing mechanism of grout hose The grout hose 4 used in the present invention is not just a hollow pipe, but has a closing mechanism 5 at its tip with a varying inner diameter.

For example, as shown in FIG. 2, this closing mechanism 5 fixes a T-shaped pipe 51 in a direction perpendicular to the tip of the grout hose 4, and sets the inner diameter of the pipe in the orthogonal direction to the end of the grout hose 4.
It is formed smaller than the inner diameter of (.

Alternatively, as shown in FIG. 3, the tip of the grout hose 4 may be formed with a tapered portion 52 having a small inner diameter.

Alternatively, as shown in Fig. 4.5, the transverse bin 53 or the protrusion 5
4 may be placed inside the grout hose 4 and the inner diameter may be changed.

Operation of the present invention> Next, a method for constructing an anchor according to the present invention will be explained.

B. Anchor cable processing, assembly, and insertion The anchor cable configured as described above is assembled and inserted into the drilled hole.

At this time, in order to actually prevent the tip of the grout hose 4 from being damaged, a protective cap with side openings may be provided at the tip of the bottom cap 3.

Outer Grout Next, grout material is injected into the outside of the sheath 2, that is, into the space between the sheath 2 and the hole wall 6, from the grout hose 4.

The above-mentioned closing mechanism 5 is provided at the tip of the grout hose 4, but since it is not yet closed, the grout material is discharged from the tip of the hose 4 and fills the space around the outer periphery of the sheath 2.

When the grout material reaches the hole opening, filling of the outside of the sheath 2 is completed.

(c) Inside grout Next, a steel ball or the like 55 is inserted into the grout hose 4, and the grout material is forced to the tip of the hose 4.

Then, the steel balls etc. 55 are prevented from advancing by the aforementioned closing mechanism 5, and as a result, the grout hose 4 is closed at its tip.

If the grout material is pressurized and fed under pressure, the grout material will push up the rubber ring 42 shown in FIG.
1 into the space inside the sheath 2.

Effects of the Present Invention> As described above, the present invention is a method in which a part with a varying inner diameter is provided as a closing mechanism at the tip of a grouting hose, and the closing is caused by a steel ball inserted into the grouting hose after external grouting is completed. .

Therefore, the following effects can be expected.

〉Assembling is easy as only one injection hose is required.

〉Since the volume of one injection hose can be omitted,
The outer diameter of the sheath can be reduced.

Kuha〉If the outer diameter of the sheath is smaller, the diameter of the hole to be drilled can be made smaller, which reduces construction time, reduces the size of the machine used, and
It is possible to improve overall efficiency, such as reducing the wear rate of equipment.

2〉There is one injection hose. Therefore, if a hole for inserting a steel ball or the like is provided in a part of the hose, the connection between the injection hose and the pump can be completed in one time.

In that case, continuous injection into and out of the sheath is possible, so there is no waiting time for workers, and there is no risk of the grout material hardening inside the mixer, pump, or hose.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of the structure of the tip of the anchor used in the construction method of the present invention. Figures 2 to 5. A sectional view of the closing mechanism of the Niger Loud Hose. Figure 6. A sectional view of the main parts of the Niger Loud Hose. Figure 4.

Claims (1)

[Claims] A group of PC steel wires is housed in a sheath, and the tip of one grout hose that runs along the group of PC steel wires is exposed to the outside from the tip of the sheath, and a closing mechanism is provided at the tip of the grout hose. After forming the above-mentioned PC steel wire, sheath, etc. into the hole, inject grout to the outside of the sheath through the grout hose, and after completing the injection to the outside of the sheath, close the closing mechanism. An anchor installation method that involves discharging grout material into the sheath from the same grout hose.