JP5325586B2 - How to insert an anchor - Google Patents

Description

  The present invention relates to an anchor insertion method, and more particularly to an anchor insertion method that is effective for inserting an anchor into a drilled anchor hole when an existing or new concrete structure is reinforced with an anchor.

  As an example of a concrete structure, various concrete dams such as a gravity concrete dam (a dam that supports water pressure by its own weight and gravity) built on the ground (bedrock) are known.

  Such concrete dams may deteriorate at the weak surfaces such as the boundary between the ground and the concrete dam and the joints of the concrete dam due to secular change. Since there is a risk of strain concentration and cracks and the like, a compressive load is applied to the weak surface portion by an anchor (ground anchor) to reinforce the concrete dam.

  For example, as shown in FIG. 7, a plurality of anchor holes 18 penetrating through the concrete dam 16 from the top end 17 in the vertical direction and reaching the predetermined depth of the rock 15 are drilled, and the anchor holes 318 are inserted. The tendon 2 of each anchor 1 is inserted, the tip (lower end) of the tendon 2 of each anchor 1 is fixed to the deep layer of the rock 15 with a grout material, and tension is applied to the tendon 2 of each anchor 1, By fixing the rear end portion (upper end portion) of the tendon 2 of each anchor 1 to the top end 17 of the concrete dam 16 in a state, a compressive load is applied to the weak surface portion and the concrete dam 16 is reinforced.

  When the concrete dam 16 as described above is reinforced with the anchors 1, it is necessary to apply a tension of several hundred tons to about 1,000 tons to each anchor 1, so that the weight of tendon 2 (tensile material) is applied to each anchor 1. Several tons are used. Moreover, since each anchor 1 is required to have a service life of about 100 years, a type of tendon 1 (tensile material) provided with various anticorrosion functions is used.

  For this reason, the crane 10 is installed at the top end 17 of the concrete dam 16, the anchor 1 is suspended from the wire 11 of the crane 10, and the wire 11 is drawn out or wound up by the operation of the crane 10. Is inserted into the anchor hole 18.

  However, when the anchor 1 is suspended from the wire 11 of the crane 10, an excessive load is applied to the holding portion of the anchor 1 to the wire 11, and the portion causes plastic deformation or the corrosion prevention function is impaired. Therefore, it becomes difficult to maintain the original function as the anchor 1, and the concrete dam 16 cannot be continuously reinforced with the anchor 1.

  The present invention has been made in view of the conventional problems as described above, and the anchor is anchored in a state in which the original function is maintained without causing the plastic deformation or the corrosion prevention function to be impaired. Provided is an anchor insertion method that can be inserted into a hole, thereby maintaining the function as an anchor for a long period of time, and capable of continuing to reinforce a concrete structure or the like with the anchor for a long period of time. For the purpose.

In order to solve the problems as described above, the present invention is an anchor insertion method for inserting an anchor into an anchor hole formed downward in the ground,
The pulley having a guide groove capable of guiding the anchor around, provided as the rotation center of該滑wheel is held in a fixed position Rutotomoni, the provided drive source for rotating the該滑vehicle, in guiding grooves of該滑car The anchor is inserted into the anchor hole by guiding the anchor and rotating the pulley in this state.

According to the anchor insertion method of the present invention, the anchor can be inserted into the anchor hole by guiding the anchor in the guide groove of the pulley and rotating the pulley.
Therefore, as in the case where the anchor is suspended from the crane wire and inserted into the anchor hole, an excessively large load is applied to the anchor, causing the plastic to deform plastically or the anticorrosion function to be impaired. The anchor can be inserted into the anchor hole while maintaining its original function, and the anchor function can be maintained for a long time. Can continue to be reinforced.
Further, by guiding the anchor through the guide groove of the pulley and rotating the pulley by driving the drive source in this state, the anchor can be fed out from the pulley and inserted into the anchor hole. Therefore, since an anchor that is a heavy object can be easily inserted into the anchor hole in a short time, the efficiency of the operation of inserting the anchor into the anchor hole can be greatly increased.

  Moreover, in this invention, the said pulley is good also as being rotatably supported by the crane installed in the opening edge part of the said anchor hole.

  According to the anchor insertion method of the present invention, the anchor can be extended in the tangential direction of the guide groove of the pulley by finely adjusting the position of the pulley by operating the crane, so the anchor is bent excessively locally. The anchor can be smoothly inserted into the anchor hole.

  Furthermore, in this invention, the said pulley is good also as being rotatably supported by the support stand installed in the opening edge part of the said anchor hole.

  According to the ground anchor insertion method of the present invention, the anchor can be extended in the tangential direction of the guide groove of the pulley by finely adjusting the position of the support base, so that the anchor is bent excessively locally. The anchor can be smoothly inserted into the anchor hole.

  Furthermore, in the present invention, the guide groove of the pulley is provided with irregularities, and irregularities that match the irregularities are provided on the surface of the anchor, and the irregularities of the surface of the anchor and the irregularities of the inner surface of the guide groove It is good also as being comprised so that engagement is mutually possible.

  According to the anchor insertion method of the present invention, when the anchor is guided by the guide groove of the pulley, the unevenness on the inner surface of the guide groove and the unevenness on the surface of the anchor are engaged with each other. Relative slippage can be prevented between them and the anchor can be reliably fed out of the pulley following the rotation of the pulley and inserted into the anchor hole.

  Further, in the present invention, a pair of pulleys arranged opposite to each other may be provided, and the anchor may be guided between the guide grooves of the pair of pulleys.

  According to the anchor insertion method of the present invention, since the anchor is guided between the guide grooves of the pair of pulleys, the anchor does not fall out of the guide grooves of the pulley and follows the rotation of the pulley. Thus, the anchor can be fed out from the pulley and securely inserted into the anchor hole.

  As described above, according to the anchor insertion method of the present invention, the anchor can be inserted into the anchor hole by guiding the anchor in the guide groove of the pulley and rotating the pulley. Therefore, as in the case where the anchor is suspended from the wire of the crane and the anchor is inserted into the anchor hole in this state, an excessive load acts on the anchor, causing the anchor to be plastically deformed, The anticorrosion function is not impaired, the anchor can be inserted into the anchor hole while maintaining the original function, and the anchor function can be demonstrated for a long time. It is possible to continue to reinforce structures and the like in the long term.

It is the schematic which showed 1st Embodiment of the insertion method of the anchor by this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 2nd Embodiment of the insertion method of the anchor by this invention. It is the elements on larger scale of 3rd Embodiment of the insertion method of the anchor by this invention. It is the elements on larger scale of 4th Embodiment of the insertion method of the anchor by this invention. It is the elements on larger scale of 5th Embodiment of the insertion method of the anchor by this invention. It is the schematic which showed an example of the conventional insertion method of an anchor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of an anchor insertion method according to the present invention. This anchor insertion method is a ground anchor 1 (hereinafter referred to as anchor 1) used for reinforcing a concrete dam 16 (gravity concrete dam, etc.) which is an existing or new concrete structure built on the ground (rock 15). )).

  That is, according to the anchor insertion method of the present embodiment, a drilling machine penetrates the concrete dam 16 from the top end 17 in the vertical direction and drills the anchor hole 18 reaching the predetermined depth of the rock mass 15. In this method, the anchor 1 is inserted into the hole 18, and the anchor 1 is inserted into the anchor hole 18 using the pulley 5.

  In the case where the concrete dam 16 is reinforced with the anchor 1, it is necessary to give the anchor 1 a tension of about several hundred tons to 1,000 tons. Therefore, in this embodiment, the diameter provided with the tendon 2 having a weight of several tons. An anchor 1 having a diameter of about 200 to 300 mm into which the anchor 1 can be inserted is drilled at a plurality of locations in the concrete dam 11 using an anchor 1 having a diameter of about 200 to 300 mm.

  The anchor 1 is provided with a type of tendon whose surface is covered with an anticorrosive material, or a tensile material is inserted into the sheath tube, and an anticorrosive material such as oil is provided between the tensile material and the sheath tube. Although there are those equipped with a filled type tendon, etc., in this embodiment, since a service life of about 100 years is required, the sheath tube 3, a tensile material (not shown), and an anticorrosive material (not shown) are used. The anchor 1 having the tendon 2 of the type combined with

  In this embodiment, when the tendon 2 of the anchor 1 is inserted into each anchor hole 18, the pulley 5 is rotatably installed at the opening edge of the anchor hole 18, and the tendon 2 is guided by the pulley 5 so that the tendon 2 can be fed out. The tendon 2 is inserted into the anchor hole 18 while being fed out of the pulley 5 by the rotation of the pulley 5.

  The pulley 5 has a disk shape having a U-shaped or V-shaped guide groove 5a around it (in this embodiment, U-shaped), and a support shaft 6 is integrally provided at the center. The shaft 6 is rotatably supported by a support frame 7.

  The pulley 5 is suspended from the wire 11 of the crane 10 installed at the top end 17 of the concrete dam 16 via the support frame 7, and is configured to be rotatable in this state. In this case, by operating the crane 10, the vertical and horizontal positions of the opening edge of the anchor hole 18 of the pulley 5 can be adjusted.

  In the state where the pulley 5 is suspended from the wire 11 of the crane 10, the support shaft 6 is connected to a drive source (not shown) via a power transmission member (not shown) such as a gear, a chain, and a belt, It is configured to rotate via the power transmission member and the support shaft 6 by driving the drive source. In this case, the drive source may be provided on the support frame 7 or on the top end 17 of the concrete dam 16.

  The drive source is, for example, a motor with a speed reducer, and the support shaft 6 of the pulley 5 is connected to the output shaft of the motor with speed reducer via a power transmission member, and the power transmission member and the support shaft 6 are driven by driving the drive source. It is comprised so that the pulley 5 may rotate via.

  In this case, by using a motor with a speed reducer with a brake as the drive source, when the tendon 2 of the anchor 1 is inserted into the anchor hole 18, the drive source is repeatedly driven and stopped. Since the pulley 5 can be held at the stop position by the operation, the pulley 5 is not rotated by the weight of the tendon 2 and the tendon 2 can be continuously held.

  A mechanical brake (disk type, drum type brake, etc.) operated by pneumatic pressure or hydraulic pressure is attached to the pulley 5 or the support shaft 6, and this mechanical brake is interlocked with ON / OFF of the drive source. It may be configured.

  In order to insert the anchor 1 into the anchor hole 18 by the anchor insertion method as described above, first, a drilling machine is installed at the top end 17 of the concrete dam 16, and a plurality of concrete dams 16 are formed by the drilling machine. An anchor hole 18 is drilled at a location.

  Next, the crane 10 is installed at the top end 17 of the concrete dam 16, the pulley 5 is suspended from the wire 11 of the crane 10 via the support frame 7, and the tendon 2 of the anchor 1 is attached to the top end 17 of the concrete dam 16. Is inserted into the guide groove 5a of the pulley 5 from the right to the left in the drawing, and the tip of the tendon 2 is inserted into the anchor hole 18.

  In this case, the crane 10 is operated to move the pulley 5 in the vertical direction and the horizontal direction, and the vertical and horizontal positions of the pulley 5 are set so that the tendon 2 is fed out in the tangential direction of the guide groove 5a of the pulley 5. Make fine adjustments.

  The tendon 2 of the anchor 1 may be carried in a state of being stretched to the top end 17 of the concrete dam 16 or carried to the top end 17 of the concrete dam 16 while being wound around the drum. You may comprise so that Tendon 2 may be let out from a drum by rotatingly attaching to the support stand installed in the top end 17 of the dam 16, and rotating a drum.

  Then, the drive motor of the drive source is driven, the pulley 5 is rotated via the power transmission mechanism, the tendon 2 is fed out from the guide groove 5a following the rotation of the pulley 5, and the tendon 2 is inserted into the anchor hole 18. Then, the tip of the tendon 2 is positioned at the bottom of the anchor hole 18.

  In this case, the rear end of the tendon 2 is fixed to the wire of another crane (not shown) installed at the top end 17 of the concrete dam 16 to prevent the tendon 2 from falling into the anchor hole 18. Alternatively, a dummy tendon (not shown) is attached to the rear end of the tendon 2, and the rear end of the dummy tendon is held by a wire of another crane installed at the top end 17 of the concrete dam 16. May be prevented from falling into the anchor hole 18.

  Then, after the insertion of the tendon 2 into the anchor hole 18 is completed, a grout material is injected into the bottom of the anchor hole 18 to a predetermined depth and solidified, and the tip (lower end) of the tendon 2 is deep in the bedrock 15. Fix to the part.

  Then, a jack (not shown) is installed at the top end 17 of the concrete dam 16, and tension is applied to the free length of the tendon 2 of each anchor 1 by the jack, and in this state, a fixing tool is attached to the upper end of the tendon 2. And the upper end of the tendon 2 is fixed to the top end 17 of the concrete dam 16.

  It should be noted that after applying tension to tendon 2, the entire inside of anchor hole 18 is filled with a grout material and solidified, so that the entire free length of tendon 2 is fixed to concrete dam 16 side. May be.

  As described above, the tendon 2 of the anchor 1 is inserted into the anchor hole 18 drilled in the concrete dam 16, the lower end of the tendon 2 is fixed to the deep layer of the bedrock 10, and the free length of the tendon 2 is tensioned. The concrete dam 16 can be reinforced by fixing the upper end portion of the tendon 2 to the top end 17 of the concrete dam 16 in a state where force is applied.

  In the anchor insertion method according to the present embodiment configured as described above, the pulley 5 is rotatably installed at the opening edge of the anchor hole 18 provided in the concrete dam 16, and the guide groove 5a of the pulley 5 is provided. Since the tendon 2 of the anchor 1 is guided and the pulley 5 is rotated, the tendon 2 of the anchor 1 is extended from the guide groove 5a of the pulley 5 and inserted into the anchor hole 18. 11, when the tendon 2 of the anchor 1 is suspended and the tendon 2 is inserted into the anchor hole 18 by operating the crane 10, an excessively large load acts on the tendon 2, and the tendon 2 is plastically deformed. It does not occur or the anticorrosion function of tendon 2 is not impaired.

 Therefore, since the tendon 2 of the anchor 1 can be inserted into the anchor hole 18 while maintaining the original function, the concrete dam 16 can be continuously reinforced by the anchor 1.

  FIG. 3 shows a second embodiment of the anchor insertion method according to the present invention. In this anchor insertion method, a support base 12 is installed at the top end 17 of the concrete dam 16, and the pulley 5 is rotatably supported by the support base 12. The other structure is the same as that of the first embodiment. It is the same as that shown in the form.

  Even in the anchor insertion method of the present embodiment, the pulley 5 is rotatably supported by the support base 12 in addition to the same effects as those shown in the first embodiment. There is no need to install the crane 10 at the top end 17 of the concrete dam 16, and the space for installing the pulley 5 to be rotatable can be reduced.

  FIG. 4 shows a third embodiment of the anchor insertion method according to the present invention. This anchor is inserted by a main pulley 8 and a pair of pulleys 8 and 9 of a sub pulley 9 having a smaller diameter than the main pulley 8, and between the guide groove 8 a of the main pulley 8 and the guide groove 9 a of the sub pulley 9. The other components are the same as those shown in the first embodiment.

  Even in the anchor insertion method of the present embodiment, the same effect as that of the first embodiment can be obtained, and the guide groove 8a of the main pulley 8 and the guide groove 9a of the auxiliary pulley 9 Since the tendon 2 of the anchor 1 is guided between the two, the tendon 2 does not fall out between the guide grooves 8a, 9a of the pair of pulleys 8, 8, and the guide groove 8a of the pair of pulleys 8, 9 , 9a, the tendon 2 of the anchor 1 can be reliably guided and inserted into the anchor hole 18.

  FIG. 5 shows a fourth embodiment of the anchor insertion method according to the present invention. This anchor is inserted by a main pulley 8 and a pair of pulleys 8 and 9 of a sub pulley 9 having a smaller diameter than the main pulley 8, and between the guide groove 8 a of the main pulley 8 and the guide groove 9 a of the sub pulley 9. And the main pulley 8 and the auxiliary pulley 9 are supported by the support base 12 installed at the top end 17 of the concrete dam 16, and the other configuration is the first embodiment. It is the same as that shown in the form.

  Even in the anchor insertion method of the present embodiment, the same effect as that of the first embodiment can be obtained, and the guide groove 8a of the main pulley 8 and the guide groove 9a of the auxiliary pulley 9 Since the tendon 2 of the anchor 1 is guided between the two, the tendon 2 does not fall out between the guide grooves 8a, 9a of the pair of pulleys 8, 9, and the guide groove 8a of the pair of pulleys 8, 9 9a, the tendon 2 of the anchor 1 can be reliably guided and inserted into the anchor hole 18, and the pulleys 8 and 9 are rotatably supported by the support base 12. There is no need to install the crane 10 at the top end 17, and the space for rotatably installing the pulleys 8 and 9 can be reduced.

  FIG. 6 shows a fifth embodiment of the anchor insertion method according to the present invention. In this anchor insertion method, unevenness 5b is provided on the inner surface of the guide groove 5a of the pulley 5, and unevenness 3a that matches the unevenness 5b of the guide groove 5a is provided on the surface of the sheath tube 3 of the tendon 2 of the anchor 1. 5a and 5b and the unevenness 3a of the sheath tube 3 of the tendon 2 of the anchor 1 are configured to be engaged with each other, and other configurations are those shown in the first to fourth embodiments. It is the same.

  Even in the anchor insertion method of the present embodiment, the same effects as those shown in the first to fourth embodiments can be obtained, and the unevenness 5b provided on the inner surface of the guide groove 5a of the pulley 5 can be obtained. And the unevenness 3a provided on the surface of the sheath tube 3 of the tendon 2 of the anchor 1 are mutually engaged, so that there is a relative slip between the guide groove 5a of the pulley 5 and the tendon 2 of the anchor 1. The tendon 2 of the anchor 1 can be reliably guided by the guide groove 5 a of the pulley 5 and can be inserted into the anchor hole 18.

  In the above description, the anchor insertion method according to the present invention is applied to the case where the tendon 2 of the anchor 1 is inserted into the anchor hole 18 penetrating the concrete dam 16 from the top end 17 in the vertical direction. However, the present invention may be applied when the tendon 2 of the anchor 1 is inserted into an anchor hole penetrating the concrete dam 16 obliquely downward.

  The anchor insertion method according to the present invention is not limited to the concrete dam 16 and may be applied to various concrete structures reinforced by the anchor 1.

  Further, in the above description, one pulley 5 or a pair of pulleys 8 and 9 is suspended from the wire 11 of the crane 10 so as to be rotatable, or can be rotated via the support 12 at the top end 17 of the concrete dam 16. Although not shown, a plurality of pulleys or a plurality of pairs of pulleys are suspended from the wire 11 of the crane 10 so as to be rotatable, or the top end 17 of the concrete dam 16 can be rotated via the support base 12. It may be provided.

DESCRIPTION OF SYMBOLS 1 Anchor 2 Tendon 3 Sheath tube 3a Concavity and convexity 5 Pulley 5a Guide groove 5b Concavity and convexity 6 Support shaft 7 Support frame 8 Main pulley 8a Guide groove 9 Sub pulley 9a Guide groove 10 Crane 11 Wire 12 Support base 15 Ground (rock)
16 Concrete dam 17 Top 18 Anchor hole

Claims (5)

An anchor insertion method for inserting an anchor into an anchor hole formed downward in the ground,
The pulley having a guide groove capable of guiding the anchor around, provided as the rotation center of該滑wheel is held in a fixed position Rutotomoni, the provided drive source for rotating the該滑vehicle, in guiding grooves of該滑car An anchor insertion method comprising: inserting the anchor into the anchor hole by guiding the anchor and rotating the pulley in this state.   The anchor insertion method according to claim 1, wherein the pulley is rotatably supported by a crane installed at an opening edge of the anchor hole.   The anchor insertion method according to claim 1, wherein the pulley is rotatably supported by a support base installed at an opening edge of the anchor hole. Concavities and convexities are provided on the inner surface of the guide groove of the pulley, and concavities and convexities that match the concavities and convexities are provided on the surface of the anchor. The anchor insertion method according to any one of claims 1 to 3 , wherein the anchor insertion method is configured as follows. The anchor insertion method according to any one of claims 1 to 4 , further comprising a pair of pulleys arranged to face each other, wherein the anchor is guided between guide grooves of the pair of pulleys.

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