JP3345567B2 - Upward ground anchor insertion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an upward ground anchor insertion device, and more particularly to an upward ground anchor insertion device capable of efficiently and safely inserting a long PC anchor cable into an upward anchor hole.

[0002]

2. Description of the Related Art Conventionally, ground anchors used for ground support such as mountain retaining works are usually designed with a predetermined downward or downward inclination. For this reason, there have been few reports of construction examples using ground anchors facing upward for the purpose of permanent support of underground rock. In order to install the ground anchor upward, first, it is necessary to surely insert a heavy and long PC cable into the anchor hole which is drilled upward in the ground. For this anchor insertion work, there has been proposed a method of constructing an upwardly inclined anchor shown in FIGS. 5 and 6 (see Japanese Patent Publication No. 64-1611).

In this construction method, as shown in FIG. 5, a sheath 5 accommodating a PC cable 53 through a pulley 52 provided on a support table 51 provided on a ground 50.
4 is wound using a winch 56 installed below the support base 51, and the PC cable 53 is inserted into an upwardly inclined anchor hole 60. At this time, the wire rope 55 is
Holder 57 attached at predetermined intervals along
Supported by As shown in FIG. 6, the holder 57 has a structure in which two steel plates are stacked, and is integrated with a connecting bolt 58 such that the sheath 54 is sandwiched from both sides by a central curved portion 57a. . The wire ropes 55 are attached to both ends of the holder 57 via stoppers 59.

[0004]

By the way, when the apparatus shown in FIG. 5 is used, when the height H from the ground surface to the top end of the underground space shown in FIG. There is a problem that it becomes large and it takes time to move and install. Further, since there is no means for holding the whole of the lifted sheath 54 during the insertion operation, the sheath 54 is moved from the state where the anchor head is on the ground as shown in FIG.
0, the entire sheath 54 is suspended only by the wire rope 55, which is unstable and
It is very dangerous. Further, in the same apparatus, as the wire rope 55 is wound up by the winch 56, the sheath 54 is inserted into the anchor hole 60, and every time the holder 57 reaches the anchor hole opening, the work of removing the bolted holder 57 from the sheath 54 is performed. And there is a problem that a smooth insertion operation cannot be performed.

[0005] Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to maintain high security and to insert an anchor cable upward into an upward anchor hole quickly. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a base machine and an anchor unit mounted on a distal arm of the base machine and extending along a holder body extending in a longitudinal direction. Anchor holder and attached near the front end of this anchor holder,
A wire guided through the holder body to the rear end of the anchor unit and holding the anchor unit by end holding means; one end detachably connected to an intermediate position of the wire and the other end detaching the sheath of the anchor unit; A wire winding device capable of winding a branch wire connected to a sheath holding means that freely grips, and operating the tip arm so that a tip position of the anchor unit is drilled upward to drill the tip position of the anchor unit. By winding the wire by the wire winding device in a state where the wire is aligned with the mouth and moving the sheath holding means along the anchor holder, the anchor unit is continuously inserted into the anchor hole. It is characterized by having done.

[0007] The sheath holding means is removed at a stage where it is drawn to the vicinity of the mouth of the anchor hole, and the wire is continuously wound up and the terminal holding means is moved along the anchor holder so that the anchor unit is moved. It is preferable to continuously insert into the anchor hole.

It is preferable that the sheath holding means grips the sheath of the anchor unit so that the half cylindrical tube is fitted.

Further, after the above-described anchor insertion operation, an attachment to which an anchor plate can be attached is attached to the distal end of the anchor holder, and the anchor plate is moved to the anchor hole opening by operating the distal end arm to be installed. Is preferred.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the upward ground anchor insertion device according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a construction state diagram showing a state in which an upward ground anchor is constructed using an upward ground anchor insertion device 1 of the present invention in an underground excavation space. The upward ground anchor insertion device 1 shown in FIG. 1 includes a base machine 10, an anchor holder 30 supported by a tip of a boom 11 provided in the base machine 10, and capable of holding an anchor unit 20 in a longitudinal direction, A wire winding device 40 that is attached to the holder 30 and feeds the anchor unit 20 held by the anchor holder 30 into the anchor hole 2. In this specification, a plurality of P
An anchor cable bundle manufactured by integrally housing the C cable 22, the grout injection pipe 23 and the exhaust pipe 24 is called an "anchor unit", and is denoted by reference numeral 20.

In the present embodiment, a crawler type power shovel is used as the base machine 10.
An anchor holder 30 is attached to the tip of the boom 11 instead of a bucket (not shown) as a normal attachment. As with the conventional machine, the base machine 10 allows the tip arm 12 to perform a 360 ° rotation with respect to the rotation axis by a built-in rotation motor (not shown) in addition to the rotation of the cockpit base and the tilt of the boom 11 as in the conventional model. ing. Further, the inclination of the anchor holder 30 can be finely controlled by the expansion and contraction of the cylinder rod 13 mounted along the distal end arm 12.

As shown in FIGS. 1 and 2A, the distal end side of the anchor unit 20 is accommodated in the holder main body for a predetermined length, and the cover 32 is provided on the anchor unit 20 of the holder main body 31 at a predetermined interval. It is installed in four places. In the present embodiment, the holder main body 31 and the cover 32 are made of channel steel, and when the cover 32 is covered, a square hollow section having a side of about 150 mm is secured. Also, as shown in FIG.
Since the cover 32 is attached to the holder body 31 via the hinge 33, in order to accommodate the anchor unit 20 in the anchor holder 30, the anchor holder 30 is placed in a horizontal state using the stands 34 attached to the front and rear. By opening each cover 32, the anchor unit 20 may be placed on the holder main body 31. The shape and dimensions of the steel material used for the holder main body 31 can be appropriately set as long as the anchor unit can be securely held in the longitudinal direction. Although the anchor unit 20 is accommodated in the holder main body 31 by providing the cover 32, the cover 32 is not required if the anchor unit 20 can be securely held by the holder main body 31.

As shown in FIGS. 2A and 2B, a wire winding device 40 is attached to the lower surface near the tip of the holder body 31. This wire winding device 4
0 is the electric motor 41 and the electric motor 4 in the present embodiment.
1, a wire 43 having a predetermined length for towing the anchor unit 20 is wound around a drum 42a of the winch 42. As shown in FIG. 2A, the wire 43 is guided into the holder main body 31 through a sheave 44 provided at the front end of the holder main body 31, and further from the rear end of the holder main body 31 to the rear of the anchor unit 20. It is pulled out to the end. A branch wire 46 is connected at an intermediate position via a known wire clip 45. A sheath hanging member 25 as a sheath holding means is attached to a distal end of the branch wire 46. Further, a cylindrical end cap 47 as end holding means is attached to the rear end of the wire 43, and covers the end of the bundled PC cables 22. Wire clip 4
5 can securely hold the wire 43 when locked, and can easily be detached from the wire 43 when released. As the end holding means, other than the end cap 47, a gripping means such as the sheath hanging bracket 25 or a known fixing jig can be appropriately used.

FIG. 3 is a partial sectional view showing the structure of the sheath hanging member 25. As shown in FIG. As shown in FIG. 2B, a sheath hanging member 25 as a sheath holding means has a hinge 26 at one end.
3 (b), and is rotatable as shown by the arrow in FIG. 3 (b), and is continuous with the inner surface of the tube so as to have a wavy cross section along the longitudinal direction. Thus, an uneven surface 28 whose inner diameter changes is formed. This uneven surface 2
8 is designed to engage with the uneven surface of the sheath 21 as shown in FIG. 7A, and can firmly grip the sheath 21 in the closed state shown in FIG. Therefore,
The wire 43 is connected to the drum 42 as shown in FIG.
a, and is drawn in the direction of arrow A along the longitudinal direction of the holder main body 31, and the wire clip 45
The sheath 21 gripped by the sheath hanging member 25 connected to the wire 43 by the branch wire 46 via the wire is also drawn along the holder main body 31. In the present embodiment, the sheath is gripped so that the above-described half-cylindrical tubes are aligned, but various jigs may be used as long as the sheath is securely held and easily detachable from the sheath. Can be.

The operation of inserting the anchor unit 20 into the upward anchor hole 2 using the ground anchor insertion device 1 having the above configuration will be described with reference to FIGS. First, as shown in FIG. 2, the anchor holder 30 attached to the tip of the arm 11 of the base machine 10 (not shown) is placed horizontally on the ground. The anchor unit 20 is set in the holder main body 31 with the cover 32 opened. At the same time, the wire 43 is pulled out from the drum 42a of the winch 42. The wire clip 45 is attached to the wire 43 near the intermediate position in the longitudinal direction of the anchor unit 20, and the sheath 21 is gripped by the sheath suspension fitting 25 attached to the branch wire 46.
At this time, it is preferable to securely hold the sheath 21 as shown in FIG. 3B by using a tightening bolt 29 provided at the open end of the half cylindrical tube 27. Further, an end cap 47 attached to the end of the wire 43 is put on the end of the PC cable 22. In this state, as shown in FIG. 1, the end cap C of the anchor unit 20 set on the anchor holder 30 by operating the boom 11 of the base machine 10.
At the mouth of the anchor hole 2. At this time, it is preferable that the bucket 7 on which the worker 6 is loaded using the aerial work vehicle 5 is brought closer to the mouth of the anchor hole 2.
The worker 6 also operates the remote controller 8 of the wire winding device 40 while checking the state of insertion of the anchor unit 20 during the work of inserting the anchor unit 20.

After confirming that the anchor tip cap C is located at the mouth of the anchor hole 2 and that the installation direction of the anchor holder 30 substantially coincides with the anchor insertion direction, the operation of inserting the anchor unit 20 is started. When the wire winding device 40 is operated to wind the wire 43, the anchor unit 20 is pushed up in the direction of the anchor hole 2 from the sheath suspending fitting 25 connected to the wire 43 so that the anchor unit 20 is in the anchor hole 2. Is inserted into. At this time, since the anchor unit 20 is inserted using the anchor holder 30 as a guide, smooth insertion is realized. In addition, since the outer diameter of the sheath suspending member 25 is smaller than the inner dimension of the anchor holder 30, the sheath suspending member 25 passes through the anchor holder 30 together with the anchor unit 20 and is drawn toward the distal end. When the wire 43 is sufficiently wound and the wire clip 45 reaches the position of the sheave 44 at the tip, the wire clip 4
5 is released, and the sheath hanging member 25 is also removed from the sheath 21. When the wire 43 is further wound up, the anchor unit 20 is provided with the anchor hole 2 so that the whole is pushed up by the end cap 47 portion covered on the end of the PC cable.
Is inserted into.

When the anchor unit 20 is inserted into the anchor hole until the end cap 47 comes to the mouth position of the anchor hole 2, the anchor head is supported near the mouth by using a temporary holder (not shown) such as a chain. , Anchor unit 2
0 is securely held in the anchor hole 2. This anchor unit 20 can be reliably held in the anchor hole 2 by expanding and solidifying the anchor holding packer P shown in FIG. 2A near the mouth of the anchor hole 2 by filling with a filler.

When the internal grout of the anchor unit 20 and the external grout into the anchor hole 2 are completed, the anchor head is fixed. At this time, an attachment 35 as shown in FIG. 4 was attached to the tip of the anchor holder 30 so that the anchor plate 36 could be attached to the attachment 35. Anchor plate 3
6 is set on a bottom plate 37 when the attachment 35 is supported by a stand 39 and is in a horizontal state, and its side is fixed to a support plate 38 by a known fixing tool (not shown). Thereafter, by operating the direction of the anchor holder 20 by operating the boom 11 of the base machine 10, the very heavy anchor plate 36 can be easily and safely installed at the mounting position.

[0019]

As is apparent from the above description, according to the present invention, an upward ground anchor can be quickly and safely inserted by a series of anchor insertion operations.

[Brief description of the drawings]

FIG. 1 is a state explanatory view showing a construction state according to an embodiment of an upward ground anchor insertion device according to the present invention.

FIG. 2 is an overall configuration diagram showing a configuration of an anchor holder of the upward ground anchor insertion device shown in FIG. 1;

FIG. 3 is a partial cross-sectional overall view and a cross-sectional view showing a configuration of a sheath hanging bracket.

FIG. 4 is a partially enlarged view showing a state where an attachment for attaching an anchor plate is attached to a tip of an anchor holder.

FIG. 5 is an overall configuration diagram showing an example of a conventional upward anchor insertion device.

FIG. 6 is a partially enlarged view showing details of a holder shown in FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 upward ground anchor insertion device 2 anchor hole 10 base machine 12 distal arm 20 anchor unit 25 sheath gripping tube 30 anchor holder 31 holder body 35 attachment 36 anchor plate 40 wire take-up device 43 wire 46 branch wire 47 end cap

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroshi Yamada 2 Tobanjima Construction, Sanbancho, Chiyoda-ku, Tokyo Inside (72) Inventor Tomoyoshi Shikata 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. 72) Inventor Hiroshi Chikyu 2 Tobanjima Construction Co., Ltd., Sanbancho, Chiyoda-ku, Tokyo (72) Inventor Kaoru 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Hirotaka Nakahara Tokyo No. 2, Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. (72) Inventor Kazunobu Matsumoto No. 2, Sanbancho, Chiyoda-ku, Tokyo No. 2 Tobishima Construction Co., Ltd. Tobishima Construction Co., Ltd. (72) Inventor Isao Shirakawa 4-325 Ishiura-cho, Takayama City, Gifu Prefecture Kentec Co., Ltd. (56) References JP-A-3-3 262823 (JP, A) JP-B 64-1611 (JP, B2) JP-B 7-53552 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 20/00 E02D 5 / 80

Claims (4)

(57) [Claims] 1. A base machine, an anchor holder mounted on a distal arm of the base machine and accommodating an anchor unit along a holder body extending in a longitudinal direction, and an anchor holder attached near a front end of the anchor holder, One end of the wire guided to the rear end of the anchor unit through the holder body and holding the anchor unit by the end holding means is detachably connected to an intermediate position of the wire, and the other end is detachably attached to the sheath of the anchor unit. A wire winding device capable of winding a branch wire connected to the sheath holding means to be gripped, and operating the tip arm to align the tip position of the anchor unit with the mouth of the anchor hole drilled upward. The wire is wound by the wire winding device in the Upward Ground anchor insertion device, characterized in that said anchoring unit the means by moving along the anchor holder was set to be continuously inserted into the anchor hole. 2. The method according to claim 1, wherein the sheath holding means is removed at a stage where the sheath holding means is drawn to a position near the mouth of the anchor hole, and the wire is continuously wound and the terminal holding means is moved along the anchor holder. The upward ground anchor insertion device according to claim 1, wherein the unit is continuously inserted into the anchor hole. 3. The insertion of an upward ground anchor according to claim 1, wherein the sheath holding means grips the sheath of the anchor unit by aligning the half cylindrical tubes. apparatus. 4. The apparatus according to claim 1, wherein an attachment to which an anchor plate can be attached is attached to a tip of said anchor holder, and said anchor plate is moved to said anchor hole opening by operation of said tip arm to be installed. The upward ground anchor insertion device according to any one of claims 3 to 3.