JP4844936B2 - High-frequency induction heating type removal anchor load bearing body - Google Patents

Description

  The present invention relates to a load-bearing body used for an anchor that cuts and removes a tensile steel material by high-frequency induction heating.

  Removal anchor removed from the soil after construction, unbonded PC steel stranded wire fixed to the load-bearing body with a crimp grip is cut by high-frequency induction heating at a position near the load-bearing body and removed so that it can be easily pulled out from the ground. An apparatus is disclosed in Patent Document 1.

  The load-bearing body proposed for this removal device is a high-pressure heating coil that surrounds the unbonded PC steel stranded wire that penetrates the load bearing plate and auxiliary bearing plate by connecting and assembling them with fixing bolts. In addition, the surrounding area was covered with a coil protection tube.

  In these conventional load-bearing body systems, it is difficult to ensure strength because the load-bearing body main body is assembled using bolts in a limited space. Moreover, the loss of cutting energy has occurred because the friction rod is arranged in the high frequency induction heating coil.

  Furthermore, because the friction rod is placed at the center of the load-bearing body, the placement position of the lead wire is limited, and when the anchor fixing tension is applied, if some of the grounds are destroyed or damaged and a multi-stage load-bearing body movement accident occurs, high-frequency induction There is a possibility that the lead wire connecting the heating coils in series may be cut in the solidified ground.

  In addition, since the number of components of the load-bearing body is large, for example, it is necessary to install a steel coil protective tube to protect the high-frequency induction heating coil, there is a problem that the manufacturing and assembly costs are increased.

JP 2008-88772 A (2nd, 3rd page, 7th and 9th figures)

  The present invention has been made in view of the above problems, and has an integral structure with a small number of parts and a low assembly cost, and has a space capable of protecting and storing the high frequency induction heating coil, and has high high frequency induction heating efficiency and It is an object of the present invention to provide a load-bearing body for a high-frequency induction heating type removal anchor having a configuration capable of preventing a power supply line disconnection accident.

The load bearing body for a high frequency induction heating type removal anchor of the present invention is a load bearing body used for a high frequency induction heating type removal anchor,
A load bearing body in which a substantially cylindrical bearing body, a prismatic friction rod extending rearward, and a plate-shaped bearing body having the same outer diameter as the bearing body are integrally formed at the rear end thereof by casting. It is composed of a main body, a crimp grip lid connected to the tip of the support body with a bolt, and a high-frequency induction heating coil stored in the support body,
The cylindrical bearing body is formed with a rectangular coil housing square hole having an axial direction extending from one circumferential surface to the circumferential surface opposite to the central axis, Before and after the body part, a wiring hole drilled in the center and a plurality of unbonded PC steel stranded through-holes are drilled near the outer periphery from the center axis, and are provided so as to open into the coil storage square holes, respectively. Furthermore, in the axial direction of the circumferential surface of the bearing body portion, a plurality of guide grooves for supporting unbonded PC steel stranded wires toward the other load bearing bodies of the anchor tip portion are provided,
The friction rod part and the plate-like support body part are provided with a wiring hole penetrating to the support body part in parallel to the central axis,
A plurality of guide grooves for supporting unbonded PC steel stranded wires are provided in the axial direction of the circumferential surface of the plate-shaped support body portion,
In addition, the crimping grip cover includes a plurality of through holes of the bolts, a wiring hole drilled in the center, and a tip support for inserting an unbonded PC steel stranded wire held by the crimping grip near the outer periphery from the center axis. In the axial direction of the groove and the circumferential surface, there are provided a plurality of guide grooves that support unbonded PC steel stranded wires toward the other load bearing bodies of the anchor tip,
A high frequency induction heating coil is housed in the coil housing square hole, and its lead wire is extended through a wiring hole provided at the center of the load bearing body.

  In addition, a slit extending in the axial direction is provided on each outer peripheral surface of the load bearing body portion and the plate-like bearing body portion of the load-bearing body body, so that the filling of the anchor fixing portion can be smoothly performed, and further the bearing body A slit or ridge extending in the circumferential direction is provided on the outer peripheral surface of each of the part and the friction bar part to increase the frictional resistance with the grout injected into the anchor hole.

  In the case of a multi-stage anchor in which a plurality of load bearing bodies are arranged on the anchor body, the high frequency induction heating coil is connected in series, and one lead wire connected to the high frequency induction heating coil of the second or nth load bearing body Is a U-shaped fold in the axial direction inside the coil storage square hole and extends forward, and the other lead wire is folded into a Z-shaped fold and housed to extend forward, and the lead wire of the wiring hole insertion portion of the load-bearing body Cover the storage tube and hermetically seal the end of the storage tube, and when the anchor's ground is damaged during anchor fixing tension, the distance between the load-bearing bodies of n is moved in the axial direction. Is characterized in that it can be extended.

  According to the load-bearing body for a high-frequency induction heating type removal anchor of the present invention, since it has a cast integrated structure, strength is ensured, the number of components is small, coil insertion and assembly are easy, and the cost is low. . Further, since the high frequency induction heating coil is stored in the coil storage square hole, damage to the coil is protected.

  Moreover, since only the PC steel stranded wire to be heated passes through the high frequency induction heating coil, there is no loss of heat cutting energy (loss due to the conventional friction rod), and the PC steel stranded wire can be cut in a short time. can do.

  Since the coil storage square hole has a space, the lead wire of the high-frequency induction heating coil can be stored in a folded state, preventing the lead wire from being cut even if the load-bearing body moves during fixing tension in a multistage anchor. can do.

  Since the load bearing body has a plate-like bearing body portion in addition to the bearing body portion, the anchor bearing resistance force is increased, and a slit extending in the circumferential direction is provided on the outer circumferential surface, so that The frictional resistance can be increased.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a load bearing body for a high frequency induction heating type removal anchor according to the present invention.

  The load-bearing body 100 for the high frequency induction heating type removal anchor includes a substantially cylindrical bearing body 11, a prismatic friction rod section 12 extending rearward thereof, and a plate whose outer diameter is the same as the bearing body 11 at the rear end thereof. Load-bearing body main body 10 integrally formed by casting, and pressure-bonding grip lid 14 connected to the tip of bearing body 11 by lid bolt 15, and high-frequency housed in bearing body And an induction heating coil 30.

  The columnar bearing body 11 is formed with a rectangular coil storage square hole 11b having a longitudinal direction extending from one circumferential surface to the circumferential surface opposite to the central axis. Before and after the support body 11, a wiring hole 11 e drilled at the center and a plurality of unbonded PC steel stranded wires (not shown) through holes 11 a are drilled from the central axis toward the outer periphery, each of which is stored in a coil. It is provided so as to open in the square hole 11b.

  Further, in the axial direction of the circumferential surface of the bearing body 11, a plurality of guide grooves 11 c that support unbonded PC steel stranded wires toward another load bearing body at the anchor tip are provided. In this embodiment, two guide grooves 11c are provided on the left and right sides of the circumferential surface at intervals of 180 degrees.

  The friction rod portion 12 and the plate-like bearing body portion 13 are provided with wiring holes 12a and 13a penetrating to the bearing body portion in parallel with the central axis. In this embodiment, the friction rod portion 12 has a square bar shape, but may be a round bar.

    A plurality of guide grooves 13 c that support unbonded PC steel stranded wires are provided in the axial direction of the circumferential surface of the plate-shaped bearing body 13. In this embodiment, four guide grooves 13c are provided on the circumferential surface at intervals of 90 degrees, and a wiring hole 13a is drilled in the center.

  The crimp grip lid 14 has a bolt hole 14d through which the lid bolt 15 is passed, a wiring hole 14c drilled in the center, and a tip for inserting an unbonded PC steel stranded wire held by the crimp grip near the outer periphery from the center axis. A support groove 14a is formed.

  Further, in the axial direction of the circumferential surface of the crimping grip cover 14, a plurality of guide grooves 14 b that support unbonded PC steel stranded wires toward another load bearing body at the anchor tip portion are provided. In this embodiment, two guide grooves 14b are provided at intervals of 180 degrees. Note that this guide groove 14b is not used when the first load-bearing body at the head of the multistage anchor is used.

  A high-frequency induction heating coil 30 is housed in a coil housing square hole 11b formed in the bearing body 11, and a lead wire (power supply line) 32 thereof is a wiring hole 11e provided at the center of the load bearing body body 10. , 12a and 13a are extended.

  Next, the cross-sectional shape of the load bearing body 10 will be described with reference to FIG. 2 is a cross-sectional view of the load bearing body 100 for high-frequency induction heating type removal anchors shown in FIG. 1, (a) is a cross-sectional view along AA, (b) is a cross-sectional view along BB, and (c) is a cross-sectional view along CC. (D) is DD sectional drawing, (e) is EE sectional drawing.

FIG. 2 (a) shows the head portion of the pressure bearing body 11. Four screw holes 11d for attaching the lid bolt 15 for fixing the crimp grip lid 14 are drilled in the vicinity of the outer periphery, and the lead wire 32 is at the center. A wiring hole 11e to be passed is formed. Through holes 11a and 11a of PC steel stranded wires (not shown) are perforated at locations away from the central axis in the vertical direction. (Refer to Fig. 4 for the state where the PC steel stranded wire penetrates.)
In addition, guide grooves 11c are formed on the left and right sides of the outer peripheral portion.

  FIG. 2B shows a portion in which the supporting pressure body portion 11 is formed in both side pillars by the coil storing square hole 11b formed in the supporting pressure body portion 11, and the high frequency induction heating coil is formed in the coil storing square hole 11b. 30 is stored. The lead wire 32 of the high frequency induction heating coil 30 is folded and stored at the center.

  Guide grooves 11c are formed on the outer peripheries of both side pillars. The stored high-frequency induction heating coil 30 has an oval cross section, and has a space through which two PC steel stranded wires penetrate vertically. (Refer to Fig. 4 for the state where the PC steel stranded wire penetrates.)

FIG. 2C shows a rear end portion of the pressure bearing body portion 11, in which a wiring hole 11 e is drilled and a lead wire 32 is passed. Through holes 11a and 11a of PC steel stranded wires (not shown) are perforated at locations away from the central axis in the vertical direction. (Refer to Fig. 4 for the state where the PC steel stranded wire penetrates.)
In addition, guide grooves 11c are formed on the left and right sides of the outer peripheral portion.

  FIG. 2D shows a portion of the friction rod portion 12, in which a wiring hole 12 a is drilled in the center and a lead wire 32 is passed.

  FIG. 2 (e) is a portion of the plate-like bearing body portion 13 formed at the rearmost end of the load-bearing body main body 10. A wiring hole 13a is drilled in the center, and the outer periphery of the PC steel stranded wire is spaced 90 degrees apart. Four guide grooves 13c are formed. In the figure, the upper and lower two guide grooves 13c are formed deeply so as to be inserted into the through hole 11a of FIG.

  Next, the slit provided in the outer periphery of the load-bearing body main body 10 is demonstrated. FIG. 3 shows the surface shape of the load-bearing body, (a) is a plan view, and (b) is a front view.

  As shown in FIGS. 3 (a) and 3 (b), axially extending slits 11g and slits 13g are formed on the outer peripheral surfaces of the load bearing member 11 and the plate-like bearing member 13 of the load bearing body 10 respectively. To reduce the flow resistance when the injected grout flows to the bottom of the anchor hole, and to prevent the gap from filling the anchor hole.

  Further, slits 11f and flanges 12f extending in the circumferential direction are provided on the outer peripheral surfaces of the bearing body part 11 and the friction bar part 12, respectively, to increase the frictional resistance when the grout injected into the anchor hole is solidified.

  FIG. 4 shows an embodiment using the load-bearing body for a high-frequency induction heating type removal anchor of the present invention, (a) is a front cross-sectional view, and (b) to (e) are cross-sectional arrow views of each part of (a). is there.

  FIG. 4 shows the second stage load bearing body of the multistage anchor, and shows a state where the PC steel stranded wire 20 is fixed to the high frequency induction heating type removal anchor load bearing body 100 by the crimping grip 16.

  As shown in FIG. 4 (a), the PC steel stranded wire 20 passes through the guide groove 13c of the plate-shaped bearing member 13 and is inserted through the through hole 11a at the rear end of the bearing member 11. The hole 11b penetrates through the high frequency induction heating coil 30, is inserted through the through hole 11a at the tip of the pressure bearing body 11, and is fixed so as not to come out of the pressure bearing body 11 with the crimp grip 16. It is put on the tip of the crimping grip 16 and fixed to the bearing body 11 with a cover bolt 15.

  As the PC steel stranded wire 20, an unbonded type in which a crimp grip 16 is attached to an end portion on the load bearing body side is used.

  In FIG. 4, the high-frequency induction heating coil 30 housed in the load bearing body of the multistage anchor supplies power as a series connection, but may be a parallel connection. One lead wire 32 connected to the high-frequency induction heating coil extends forward as a U-shaped fold 32b in the axial direction in the coil storage square hole 11b, and the other lead wire is folded into a Z-shaped fold 32a for storage. When the anchor's ground is damaged and the distance between the front and rear load-bearing bodies moves in the axial direction during anchor anchoring tension, the folded lead wire can be extended to prevent cutting accidents. .

  In this embodiment, the coil storage square hole 11 b on the outer peripheral surface of the high frequency induction heating coil 30 is covered with the protective aluminum cover 31.

FIG. 4B shows a state where the crimping grip lid 14 is viewed from the left side view of FIG. As shown in this figure, a PC steel stranded wire 20 is passed through the guide groove 14b toward the load bearing body at the tip.

  FIG. 4C is a cross-sectional view taken along the line AA in FIG. 4A, and the PC steel stranded wire 20 is gripped by the crimping grip 16 and fixed so as not to come off from the pressure bearing body portion 11. A lead wire 32 is passed through the wiring hole 11e.

  4D is a cross-sectional view taken along the line B-B in FIG. 4A, and two upper and lower PC steel stranded wires 20 penetrate the inside of the high-frequency induction heating coil 30. Also, in the central gap of the high frequency induction heating coil 30, one lead connected to the coil of the two lead wires 32 is stored in a U-shaped fold, and the lead wire leading to the other load bearing body is stored in a Z-shaped fold. Yes.

  4 (e) is a cross-sectional view taken along the line CC of FIG. 4 (a). A lead wire 32 is passed through the wiring hole 12a at the center of the square-shaped friction rod portion 12, and the outer periphery of the plate-shaped bearing body portion 13 is inserted. PC steel strands 20 are passed through the four guide grooves 13c provided,

  FIG. 5 is a schematic diagram showing the details of the mounting state of the high-frequency induction heating coil and its lead wire mounted on the load-bearing body for the high-frequency induction heating type removal anchor of the present invention.

  Since the first stage load bearing body is terminated with the high frequency induction heating coil 30 connected in series, the lead wire is connected to both ends of the coil. The lead wire 32 itself is covered with a lead wire storage tube 34, and the entrance portion of the wiring hole 11 e and the exit portion from the tube are sealed with a sealing material 35 such as a putty to prevent the crowd from flowing into the interior and solidifying. To do.

  In the second-stage load-bearing body, the lead wires 32 extending to the first-stage load-bearing body are also covered with the lead wire storage tube 34, and the front and back of the tube are sealed with a sealing material 35 such as a putty.

  FIG. 6 is a schematic view showing a construction state of the high frequency induction heating type removal anchor. With reference to FIG. 6, the construction procedure of the removal anchor using the load-bearing body for high frequency induction heating type removal anchor of this invention is demonstrated.

  First, an anchor hole 1 having an arbitrary angle is drilled in the ground from the construction surface where the anchor is installed. Next, the PC steel stranded wire 20 is passed through the first-stage and second-stage high-frequency induction heating type removal anchor load-bearing bodies 100 of the present invention, and each load-bearing body is attached with the crimping grip 16 to each high-frequency induction. Lead wires 32 of the heating coil 30 are connected in series to assemble an anchor having a predetermined anchor length N1.

  In the case where the anchor length N1 is long, the spacer 36 is sandwiched in the main part of the PC steel stranded wire 20 to prevent twisting.

  The anchor assembled in the drilled anchor hole 1 is built, and grout is injected from the ground surface into the anchor hole 1 to solidify the anchor hole 1. At this time, the end of the lead wire 32 of the high frequency induction heating coil 30 is extended to the ground.

  Next, a pedestal 40 is provided on the ground surface, the PC steel stranded wire 20 is tensioned, fixed by an anchor head 42 via an anchor plate 41, and excavation work proceeds.

  After completion of excavation and the construction work accompanying it, the high frequency generator 50 is installed, the lead wire 32 extended to the ground of the anchor to be removed is connected to the high frequency generator 50, and a high frequency current is applied to the high frequency induction heating coil, The PC steel stranded wire 20 is cut by heating.

  The cut PC steel stranded wire 20 can be easily removed from the ground by being pulled out from the ground.

It is a top view of the load-bearing body for high frequency induction heating type removal anchors of this invention. It is sectional drawing of the load bearing body for high frequency induction heating type removal anchors shown in FIG. 1, (a) is AA sectional drawing, (b) is BB sectional drawing, (c) is CC sectional drawing, d) is a DD sectional view, and (e) is an EE sectional view. The surface shape of a load-bearing body main body is shown, (a) is a top view, (b) is a front view. The Example using the load-bearing body for the high frequency induction heating type removal anchor of this invention is shown, (a) is front sectional drawing, (b)-(e) is each part sectional arrow view of (a). It is a schematic diagram which shows the detail of the mounting | wearing state of the high frequency induction heating coil and its lead wire with which the load body for high frequency induction heating type removal anchors of this invention is mounted | worn. It is a schematic diagram which shows the construction state of a high frequency induction heating type removal anchor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor hole 10 Load-bearing body main body 11 Supporting-body part 11a Through-hole 11b Coil storing square hole 11c Guide groove 11d Screw hole 11e Wiring hole 11f Slit 11g Slit 12 Friction-bar part 12a Wiring hole 12f 鍔 13 Plate-shaped supporting body part 13a Wiring hole 13c Guide groove 13g Slit 14 Crimp grip lid 14a Tip support groove 14b Guide groove 14c Wiring hole 14d Bolt hole 15 Lid bolt 16 Crimp grip 20 PC steel twisted wire 30 High frequency induction heating coil 31 Protective aluminum cover 32 Lead wire (power supply) line)
32a Z-shaped fold 32b U-shaped fold 34 Lead wire storage tube 35 Sealing material 36 Spacer 40 Base 41 Anchor plate 42 Anchor head 50 High frequency generator N1 Anchor length N2 Anchor body length N3 Tip length N4 Extra digging N5 Free length N6 Extra length 100 High frequency Load carrying body for induction heating type removal anchor

Claims (3)

A load-bearing body used for a high-frequency induction heating type removal anchor,
A load bearing body in which a substantially cylindrical bearing body, a prismatic friction rod extending rearward, and a plate-shaped bearing body having the same outer diameter as the bearing body are integrally formed at the rear end thereof by casting. It is composed of a main body, a crimp grip lid connected to the tip of the support body with a bolt, and a high-frequency induction heating coil stored in the support body,
The cylindrical bearing body is formed with a rectangular coil housing square hole having an axial direction extending from one circumferential surface to the circumferential surface opposite to the central axis, Before and after the body part, a plurality of wiring holes drilled in the center and a plurality of unbonded PC steel stranded through holes near the outer periphery from the central axis are provided so as to open into the coil storage square holes, respectively. Furthermore, in the axial direction of the circumferential surface of the bearing body, a plurality of guide grooves for supporting unbonded PC steel stranded wires toward the other load bearing bodies of the anchor tip are provided,
The friction rod part and the plate-like support body part are provided with a wiring hole penetrating to the support body part in parallel to the central axis,
A plurality of guide grooves for supporting unbonded PC steel stranded wires are provided in the axial direction of the circumferential surface of the plate-shaped support body portion,
In addition, the crimping grip cover includes a plurality of through holes of the bolts, a wiring hole drilled in the center, and a tip support for inserting an unbonded PC steel stranded wire held by the crimping grip near the outer periphery from the center axis. In the axial direction of the groove and the circumferential surface, there are provided a plurality of guide grooves that support unbonded PC steel stranded wires toward the other load bearing bodies of the anchor tip,
A high-frequency induction heating type removal anchor load-bearing body, wherein a high-frequency induction heating coil is housed in the coil storage square hole, and a lead wire thereof is extended through a wiring hole provided in the center of the load-bearing body. .   A slit extending in the axial direction is provided on each outer circumferential surface of the load bearing body portion and the plate-like bearing body portion of the load-bearing body body to smoothly fill the anchor fixing portion with the ground, and the bearing body portion and The high frequency induction heating type removal according to claim 1, wherein slits or ridges extending in the circumferential direction are provided on each outer peripheral surface of the friction rod portion to increase frictional resistance with the grout injected into the anchor hole. Anchor load-bearing body. In the case of a multistage anchor in which a plurality of load bearing bodies are arranged on the anchor body, the high frequency induction heating coil is connected in series, and one lead wire connected to the high frequency induction heating coil of the second or nth load bearing body is a coil. Inside the storage square hole, it is made to extend forward as a U-shaped fold in the axial direction, the other lead wire is folded into a Z-shape and stored and extended forward, and the lead wire of the wiring hole insertion portion of the load bearing body is Cover the storage tube and hermetically seal the end of the storage tube, and when the anchor's ground is damaged during anchor anchoring tension and the distance between the load-bearing bodies moves in the axial direction, the folded lead wire is extended The load-bearing body for a high-frequency induction heating type removal anchor according to claim 1, wherein the load-bearing body is capable of being removed.

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