JP4834631B2 - Anchoring device for suspension structure - Google Patents

Description

The present invention relates to an anchor embedding device that suspends and installs an avalanche prevention fence, a rockfall protection fence, and the like from above a slope.

For example, civil engineering structures arranged on slopes represented by, for example, avalanche prevention fences and rockfall prevention fences, are generally suspended by ropes from which anchors are buried on the mountain side of the slopes.
In the past, an anchor for fixing a part of such a rope for a suspended structure is generally embedded by making the tip of the pipe into a tapered shape and directly driving it into the ground with a driving machine. However, this method becomes impossible when there is a hard material such as a boulder, gravel, or bedrock in the topsoil when driven, and in that case, a drilling hole is formed from the surface with a rock drill, etc. In addition to inserting anchors into the excavation holes and pouring and embedding solidifying agents such as mortar and cement, it took a lot of labor, time and cost.

As an improvement measure, the applicant uses a pipe anchor having a propulsive force receiving portion on the inner side of the tip portion, and has a bit head whose diameter can be expanded and contracted at the tip, and is capable of contacting the propulsive force receiving portion behind the bit head. Insert a drilling assembly in which a bit having a rib portion, a hammer portion, and a rotating shaft portion in series are inserted through the pipe anchor, and the bit head is expanded outside the lower end of the anchor and the bit is inserted through the rotating shaft portion and the hammer portion. The pipe anchor is propelled integrally until it reaches the required depth by transmitting the propulsive force of the hammer part from the collar part to the propulsive force receiving part while rotating the bit, and then the bit head is reduced to be smaller than the inner diameter of the propulsive force receiving part. A device was proposed in which the pipe anchor was buried in the ground by pulling out the drilling assembly from the pipe anchor.

  This prior art made it possible to embed pipe anchors in geology with boulders, gravel, bedrock parts, etc., but when reducing the diameter of the bit head that was larger than the pipe diameter in order to embed the pipe anchors As a result, foreign matter such as pebbles may adhere to the open part of the expanded bidet, and the foreign matter may harden due to rotational pressure, making it difficult to remove the foreign matter easily in the hole. The diameter could not be obtained, and there was a possibility that a trouble occurred in which the pipe and the bit head that were promoted had to be pulled out from the hole together.

In this case, re-embedding work requires labor and cost, and in order to avoid this, during the excavation work, whether or not foreign matter has adhered to the enlarged diameter part of the bit and the bit is reduced in diameter and removed. It was necessary to perform several operations to confirm that the anchor could be removed, and this caused a problem of reducing the efficiency of anchor embedment.
JP 2007-32169 A

The present invention was made in order to solve the above-mentioned problems, and the object of the present invention is to smoothly anchor the anchor in a direction perpendicular to the ground surface with a gradient in almost all geology such as boulders, gravel and rocks. An object of the present invention is to provide an apparatus that can be reliably embedded.

In order to achieve the above object, the anchor device for a suspended structure according to the present invention includes a pipe having a ring bit 1 rotatably connected to a tip portion, and the ring bit can be inserted into and removed from the ring bit during forward rotation. A pilot bit that is synchronized with the ring bit and unlocked while being separated from the ring bit at the time of reverse rotation, a hammer portion that strikes the pilot bid to provide propulsive force, and a rotary shaft portion that transmits the rotational force to the bid are connected in series. An excavation drive mechanism 3 connected in a shape, a drive means for a rotary shaft part and a hammer part, and an anchoring construction apparatus comprising a gantry for supporting the excavation drive mechanism at a construction site, wherein the ring bit has a rear end The pipe has an inner flange that can collide with the stepped part of the pilot bit, and the pipe is made of a steel ring having substantially the same outer diameter as this, and the screw p is provided only in the inner lower end region. The shoe P1 having a non-threaded surface is fixed to the upper part of the ring bit 1, and the ring bit 1 has an annular portion in which a tip made of cemented carbide or the like is disposed on the end surface and a cylinder rising from the inner diameter side thereof. Part, the threaded portion is engraved only in the outer peripheral upper end region of the cylindrical portion, the other is a non-threaded surface, when the pilot bit 2 and the ring bit 1 are rotating synchronously, In the set state in which the pipe P and the shoe P1 do not rotate and the pilot bit 2 is inserted into the ring bit 1, the lower end portion of the shoe P1 and the thick annular portion of the ring bit 1 A gap is formed between the upper end of 1a .

According to the present invention, the pipe anchor is used, but the ring bit attached to the tip without rotating the pipe anchor is rotated synchronously with the pilot bit that penetrates the pipe and protrudes to the inner peripheral side of the ring bit, and drilling energy is obtained. Can be driven efficiently and smoothly even if there are boulders, gravel and bedrock in the ground.
After driving the required length, the pilot bit is rotated in the opposite direction to separate the ring bit from the pilot bit, so that only the pilot bit can be removed smoothly, anchor embedding can be performed quickly, and the bit can expand and contract. The problem of foreign matter adhering to the surface and the unremovable trouble due to it does not occur, and the confirmation work for the presence or absence of foreign matter adhering can be abolished, so the work time can be shortened.
In particular, the pipe is made of a steel ring with almost the same outer diameter as this, and a shoe is fixed in which a screw is engraved only in the inner lower end area and the upper part is unthreaded. The bit includes an annular portion 1a in which a chip made of cemented carbide or the like is disposed on an end surface and a cylindrical portion 1b rising from an inner diameter side thereof, and a threaded portion is engraved only in the outer peripheral upper end region of the cylindrical portion 1b. Other than that, since it is a non-threaded surface , the screw part is screwed with the screw at the lower end part of the pipe P, but the ring bit 1 is prevented from coming off in the axial direction because the screw is passed by further rotation. In this state, it is held free to rotate relative to the pipe P.
Accordingly, the connection can be reliably achieved with a simple structure, and the ring bit can be prevented from dropping off.

The pilot bit connects the hammer portion and the rotating shaft portion in series, and the ring bit has a collar portion capable of colliding with the step portion of the pilot bit at the rear end portion.
According to this, since the pilot bit and the ring bit are propelled by rotation and hitting, even if there are gravel and rocks, they can be crushed and efficiently drilled.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an example in which a suspension anchor is embedded in a direction perpendicular to a slope by applying the anchor embedding method according to the present invention.
P is a pipe as an anchor to be embedded, 1 is a ring bit rotatably attached to the tip of the pipe, 2 is inserted into and removed from the pipe P, and is drilled in cooperation with the ring bit 1 The pilot bit 3 to be performed is an excavation drive mechanism provided in series with a hammer portion 3A and a rotary shaft portion (rod portion) 3B for giving an axial striking force and rotational motion to the pilot bit 2.

Reference numeral 4 denotes a pedestal feed mount installed at a construction site, which is provided with a main body 4A and a support 4B having a long rectangular frame shape so as to serve also as a guide rail, and the main body 4A has a reversible mechanism for rotating the rotating shaft portion. A drive motor 5 as a rotatable excavator is slidably attached with a pedestal 5a, and a wire rope 60 from a winch 6A is connected to the pedestal 5a to suspend the drive motor 5. A winch 6B is temporarily suspended when the excavation drive mechanism 3 and the pipe P are connected to the drive motor 5.
In this example, the drive motor 5 is a hydraulic motor, and includes a compressed air feed header 50 coaxially.

Reference numeral 7 denotes an air compressor disposed elsewhere, and is connected to the compressed air feed header 50 of the drive motor 5 via a hose 70. 8 is a hydraulic unit with a generator for supplying pressure oil to the drive motor 5, and has an operation panel 8 A including a control valve in the vicinity, and is connected to the drive motor 5 through a hose 80. .

Reference numeral 9 denotes a water supply system used when the anchor embedding geology is clayey. The water supply system 9 has a water tank 9A and a pump 9B, and is connected to an appropriate place of the compressed air supply system by a hose 90.

2 and 3 show details of the pipe P, the ring bit 1 and the pilot bit 2. The pipe P has a length of, for example, 1500 to 3500 mm, and is plated with zinc or aluminum zinc alloy on the whole. It has been subjected.
The pipe P has a hole for attaching a bolt for suspension at the upper end, and the cap is crowned after being embedded. On the other hand, the pipe p is provided with a screw p for connecting the ring bit 1 only in a relatively short range.

In the embodiment, the pipe fixes the shoe P1 by welding or the like in order to connect the ring bit 1 stably and reliably. The shoe P1 is made of a steel ring having substantially the same outer diameter as that of the pipe P, and a threaded portion p is engraved only in the inner lower end region, and the upper portion is a non-threaded surface.

The ring bit 1 is provided with a thick annular portion 1a in which a chip 100 made of cemented carbide or the like is disposed on the lower surface and a half portion is embedded, and a cylindrical portion 1b rising from the inner diameter side thereof. The threaded portion 10 is engraved only in the outer peripheral upper end region of 1b, and the rest is a non-threaded surface. Further, an inner flange 11 that protrudes moderately in the inner diameter direction is provided at the upper end of the cylindrical portion 1b.
The screw portion 10 is screwed with the screw p at the lower end portion of the pipe P. However, the ring bit 1 is prevented from coming off in the axial direction as shown in FIG. In this state, it is held freely rotatable relative to the pipe P.

The pilot bit 2 includes a bit head 2A in which a chip made of cemented carbide or the like is disposed on an end surface, and a housing (device) 2B in which a shaft-like portion protrudes rearward.
The housing 2 </ b> B is provided with a stepped portion 200 having an overhanging amount capable of colliding with the inner flange 11 of the ring bit 1. The bit head 2 </ b> A and the housing 2 </ b> B are provided with an axial groove 203 for guiding slime on the outer periphery, and an air ejection passage 202 opened in the end face of the bit head is formed in the inside.

  When the pilot bit 2 rotates forward, the inner flange 11 and the cylindrical portion 1b and the inner surface of the annular portion of the ring bit 1 are integrated with the pilot bit 2 to form a locked state as shown in FIG. When the pilot bit 2 is rotated in the reverse direction from the state, a plurality of engaging portions 12 including the groove 120 which is separated from the ring bit 1 and allows the pilot bit 2 to be inserted and removed in the axial direction as shown in FIG. The pilot bit 2 is provided with engaging convex portions 22 at the same interval.

The hammer portion 3A has a cylindrical shape, and the shaft-like portion of the pilot bit 2 is connected to the tip portion. The rotating shaft portion 3B has a pipe shape and is concentrically connected to the rear end of the hammer portion 3A. The rotation shaft portion 3B may have a required length by connecting a plurality of rotation shaft portions 3B, but in any case, the rear end of the rotation shaft portion 3B is connected to the output shaft of the drive motor 5. Therefore, when the rotating shaft portion 3B rotates, the hammer portion 3A and the pilot bit 2 are rotated synchronously.
The compressed air supplied to the compressed air feed header 50 is sent to the hammer portion 3A through the rotating shaft portion 3B and acts on the piston portion in the shaft-like portion of the pilot bit 2.

  The installation of the gantry 4 is arbitrary, and the support 4B may be fixed to the ground surface with the pin anchor 40. Further, if necessary, the upper portion of the gantry 4 may be supported on the ground surface with the holding rope 4C.

To explain the anchor buried how by the present invention apparatus, permanently installing the ring bit 1 rotates freely pipe P with a fixed shoe P1. The excavation drive mechanism 3 including the pilot bit 2 is separated from the pipe P, and the excavation drive mechanism 3 can be disassembled into the hammer portion 3A and the rotary shaft portion 3B, so that it can be reduced in size and weight and can be easily carried into the site. It is.

  In embedding, the rotating shaft portion 3B, the hammer portion 3A and the pilot bit 2 are connected. On the other hand, the gantry 4 is installed at a place where the anchor is planned to be embedded. In the case of the right angle direction of the slope, the gantry 4 is installed in a right angle direction as shown in FIG. 1, the drive motor 5 is mounted on the main body 4 </ b> A of the gantry 4, and is suspended by the winch 6 </ b> A and the rope 60. Then, the excavation drive mechanism 3 including the pilot bit 2 is inserted from the rear end of the pipe P.

FIG. 2A shows the state at this time. If the bit head 2A passes the lower end of the pipe P and protrudes from the ring bit 1, the rotating shaft portion 3B and the hammer portion 3A are rotated in the forward direction. If it carries out like this, as shown to Fig.4 (a), the ring bit 1 and the pilot bit 2 will be locked by the engaging parts 12 and 22, and will be in the state assembled | attached integrally. Therefore, the whole is lifted using the winch 6 </ b> B, and the rotary shaft portion 3 </ b> B is connected to the drive motor 5. The preparation is now complete, and the drilling assembly will be fed under its own weight.

  When the operation panel 8A is operated to drive the drive motor 5, the rotary shaft portion 3B rotates, the hammer portion 3A connected thereto rotates, and the pilot bit 2 rotates. As a result, as shown in FIG. 3, the formation is drilled by the pilot bit 2 in front of the contour of the pipe P. In addition, when the pilot bit 2 rotates in the forward direction, the ring bit 1 rotates synchronously, so that the annular portion at the end of the pipe P is also drilled. That is, without the pipe P rotating, the drilling energy by the pilot bit 2 is transmitted to the ring bit 1 and only this rotates, and the pipe P is propelled into the ground without rotating together with the excavating mechanism 3. .

  When propelled in this way, if there are boulders, gravel, and bedrock R in front, they will act as resistance to propulsion of pilot bit 2 and ring bit 1, but compressed air is sent to hammer portion 3A. Since it is supplied, the step of the pilot bit 2 makes a shocking forward stroke again until it abuts against the inner flange 11 of the ring bit 1, and the bit head 2A and the ring bit 1 collide with the boulder, gravel and rock mass R. .

And when it receives resistance by the boulders, gravel, and rock mass R, it retracts and then protrudes with air pressure. As a result, the pipe P is driven and driven integrally with the excavation drive mechanism 3 during the forward stroke of the pilot bit 2. Blowing is performed by repeating these operations, and the rotation of the pilot bit 2 and the ring bit 1 continues during that time. Therefore, the boulders, gravel, and rock mass R are efficiently crushed in a short time by such rotation and blow. .
The slime generated by the excavation as described above is discharged to the pipe anchor space on the outer periphery of the hammer portion through the axial groove of the housing 2B, is sent later through the space on the outer periphery of the rotary shaft portion, and is discharged from the rear end portion of the pipe anchor. Is done.

Hereinafter, excavation by the integral rotation movement of the pilot bit 2 and the ring bit 1 through the rotating shaft portion 3B by the drive motor 5 and the striking propulsion motion of the pilot bit 2 and the ring bit 1 by supplying compressed air to the hammer portion 3A are performed. As a result, the pipe P is efficiently propelled deep into the ground. At this time, the pedestal 5a of the drive motor 5 is guided along the guide rails of the gantry 4, so that the drive motor 5 and the following parts are smoothly fed.
Therefore, the construction geology is not limited and can be driven in quickly and smoothly. Moreover, since the pipe P does not rotate, it can be constructed without using water on most grounds other than the viscosity, and the use of water during excavation can be reduced.

As shown in FIG. 5 (a), when the hole is drilled to a predetermined depth and the pipe P has advanced, the drive motor 5 is rotated in the reverse direction. By doing so, the rotation is transmitted to the pilot bit 2 through the rotating shaft portion 3B and the hammer portion 3A, and the engaging portion 12 of the ring bit 1 is disengaged from the engaging portion 22 of the pilot bit 2 as shown in FIG. The ring bit 1 is released to enter the unlocked state.
If the excavating mechanism 3 is lifted by operating the winch 6A, the pilot bit 2, the hammer portion 3A, and the rotating shaft portion 3B are pulled out through the pipe P as shown in FIG. Only the pipe P to which 1 is attached is left in the ground.
That is, the burying of the pipe P is completed simultaneously with the completion of excavation and driving. Since the excavation drive mechanism 3 including the extracted pilot bit 2 can be used repeatedly, it is economical.

In the present invention, since the pilot bit 2 does not expand / contract, there is no risk of troubles such as adhesion, biting and solidification of foreign matter such as pebbles between the conventional enlarged diameter bit head separating portions, and foreign matter adhesion when expanding the bit diameter Since work such as confirmation of the state is also unnecessary, work efficiency can be shortened.
In addition, since the pipe P does not rotate, the inner and outer surfaces can be anti-corrosive plated, and after embedding, there is no worry of corrosion if a cap is applied, so it is not necessary to inject mortar. Becomes simpler.
Moreover, since the pipe P does not rotate, it is possible to embed anchors in a direction perpendicular to the slope up to a slope of about 60 degrees, and the work can be simplified because the setup of the slope is unnecessary.

It is a front view which shows the outline | summary of the embedding apparatus of the anchor for suspension structures concerning this invention. (A) is sectional drawing at the time of a pilot bit set, (b) is the one part enlarged view. It is sectional drawing which shows a pipe embedding start step. (a) is a bottom view of FIG. 3, (b) is a bottom view in an unlocked state. (a) is a sectional view showing a state where excavation and driving is completed, and (b) is a sectional view showing a state in which a pilot bit is being extracted.

P pipe 1 ring bit 2 pilot bit 2A bit head 3 excavation drive mechanism 3A hammer part 3B rotating shaft part 4 mount 5 drive motor 11 flange part 200 step part

Claims (2)

The pipe P with the ring bit 1 rotatably connected to the tip and the ring bit 1 can be inserted / removed. The ring bit 1 is integrated and synchronized with the ring bit 1 during normal rotation, and separated from the ring bit 1 during reverse rotation. A pilot bit 2 that is unlocked, a hammer portion 3A that gives propulsive force to the pilot bid 2, and a rotary shaft portion 3B that transmits rotational force to the bid, a drilling drive mechanism 3, and a rotary shaft portion and An anchor embedding construction device comprising a hammer means driving means and a gantry 4 for supporting the excavation drive mechanism at a construction site, wherein the ring bit 1 can collide with a stepped portion of a pilot bit 2 at a rear end portion. It has an inner flange 11, and the pipe P is made of a steel ring with almost the same outer diameter as this, and a screw p is engraved only in the inner lower end region, and the upper part is unthreaded. Fixed shoe P1 as a surface The ring bit 1 has a thick annular portion 1a in which a chip 100 made of cemented carbide or the like is disposed on the lower surface and a half portion is embedded, and a cylindrical portion 1b rising from the inner diameter side thereof. The threaded portion 10 is engraved only in the outer peripheral upper end region of the cylindrical portion 1b, and the other portion is a non-threaded surface . When the pilot bit 2 and the ring bit 1 are rotating synchronously, the pipe P and the shoe P1 do not rotate, and in the set state in which the pilot bit 2 is inserted into the ring bit 1, the lower end portion of the shoe P1 and the thick annular portion 1a of the ring bit 1 An anchor embedding construction device characterized in that a gap is formed between the upper end portion . 2. The anchor embedding device for a suspended structure according to claim 1, wherein the embedding pipe is plated with zinc or aluminum zinc alloy.

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