JPS6062400A - Construction of upwardly directed earth anchor - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing an upward earth anchor, in which the earth anchor is driven upward into a cross section of a tunnel or the like.

Conventionally, in order to drive an earth anchor into the upper section of a tunnel, a casing pipe is inserted upward into the tunnel section, an anchor cable is inserted therein, and then the opening at the lower end of the casing pipe is sealed with a cloth packer. A fixing filler is injected into the nokuib, and if the injection pressure is high, the fabric packer contracts.The anchor cable is not sufficiently fixed during injection and curing, causing it to protrude from the casing pipe. There was a drawback that the fixing filler often leaked out, making it impossible to construct a solid upward earth anchor◇ An object of the present invention is to reliably prevent the protruding movement of the anchor cable and the leakage of the fixing filler, The object of the present invention is to provide a method for constructing a solid upward earth anchor.

According to the invention, this purpose is to penetrate the casing pipe upward into the ground and insert the anchor cable into the pipe, and then insert the injection auxiliary pipe provided with the air vent into the protruding lower end of the casing pipe Km blue. −? The protruding lower end of the anchor cable is covered and supported by the injection auxiliary pipe, and the injection hose is connected to the KJ injection auxiliary pipe. This is achieved by injecting the fixing filler into the casing pipe until it comes out, preventing the fixing filler from coming out, and then cutting the protruding lower end of the casing pipe after the fixing filler hardens to expose the required length of the anchor cable.

Next, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, a casing pipe 2 is penetrated upward into a tunnel section 3 by a conventionally known casing drilling machine 1, and a sheathed anchor cable 4 is inserted into the casing pipe 2, and then the protruding lower end of the casing pipe 2 is inserted. A short injection auxiliary pipe 5 is connected.

As shown in FIG. 4, the injection auxiliary pipe 5 has a male thread 6 on the outer surface of one end, a female thread 7 on the inner surface of the other end, a hook 8 protruding from the middle of the outer surface, and a cap 9.
It is equipped with There is a male screw 1 on the outer peripheral surface of one end of the cap 9.
0 is formed, and a cock 11 is provided protruding from the other end surface, and an air vent hole 12 is provided.

To connect the injection auxiliary pipe 5 to the casing pipe 2, the male thread 6 of the former is screwed into the female thread of the latter, and
Screw the cap 9 onto the other end of the former, and attach the casing pipe 2.
The lower end of the anchor cable 4, which is more protruding, is covered and supported by the injection auxiliary pipe 5 to prevent the anchor cable 4 from falling. Further, in order to prevent the casing pipe 2 itself from falling, a wire 15 is stretched between the hook 8 and the hook 13 fixed to the supporting material 14.

An injection hose 16 is connected to the cock 11 of the cap 9, and a discharge hose 17 is connected to the air vent hole 12.

In this state, the fixing filler is injected through the injection hose 16 into the injection auxiliary pipe 5 and the casing pipe 2 until it comes out from the air vent hole 12, and then the discharge hose 17 is tied together as shown in FIG. At the same time, the cock 11 is closed, the injection hose 16 is removed, and the injected fixing filler is cured. After the fixing filler reaches a predetermined degree of hardening, the protruding lower end of the casing pipe 2 is cut with, for example, a gas cutter 18 and removed together with the injection auxiliary pipe 5, and the hardened fixing filler is removed from the anchor cable. The anchor cable 4 is destroyed and removed to expose a required length of the anchor cable 4 as shown in FIG. 3, and the sheath is then peeled off. After that, perform the same work as before.

As described above, the present invention connects the injection auxiliary pipe to the protruding lower end of the casing pipe, covers and supports the protruding lower end of the anchor cable with this injection pipe, and also provides a fixing filler on the injection auxiliary pipe. This product is injected into the casing pipe until it comes out from the air vent hole, and then prevents it from coming out and hardens the fixing filler.It reliably prevents the anchor cable from protruding and moving, and the fixing filler from leaking out. A practical upward facing earth anchor can be constructed.

[Brief explanation of drawings]

1 to 3 are explanatory diagrams showing an embodiment of the present invention according to a working procedure, and FIG. 4 is a perspective view of an injection auxiliary pipe and a cap. 2°°・Casing pipe, 4... Anchor cable, 5... Injection auxiliary pipe, 12... Air vent hole, 1
6... Injection hose.

Claims (1)

[Claims] 1. After penetrating the casing pipe upward into the ground and inserting the anchor cable into the pipe, connect the injection auxiliary pipe with an air vent hole to the protruding lower end of the casing pipe, and use the protruding lower end of the anchor cable as the injection auxiliary pipe. While supporting the casing with a pipe, connect the injection hose to the injection auxiliary pipe, and inject the fixing filler into the casing pipe through the injection hose and the injection auxiliary pipe until it reaches the seamount from the air vent hole to prevent the warm temperature. A method of constructing an upward earth anchor, which is characterized in that the protruding lower end of the casing pipe is cut off after the fixing filler has hardened to expose the required length of the anchor cable.