JP2015025352A - Post-installed anchor construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a post-installed anchor construction method and a post-installed anchor pull-out device in which a post-installed anchor can be pulled up without destroying a concrete structure and a new post-installed anchor can be constructed by using an existing drilled hole.SOLUTION: A post-installed anchor construction method includes: a pull-out step of applying a tension load and pulling out an anchor member 2 while applying both or any one of heat and force to the anchor member 2 anchored in a drilled hole 4 of a concrete structure 3 by adhesives 5; an adhesive removal step of removing the adhesives 5 remaining in the drilled hole 4 from which the anchor member 2 is pulled out; an adhesive filling step of filling new adhesives 5 in the drilled hole 4 from which the adhesives 5 are removed by the adhesive removal step; and an anchor member driving step of driving a new anchor member 2 into the drilled hole 4 with the new adhesives 5 filled by the adhesive filling step.

Description

  The present invention relates to a post-installation anchor construction method, and more particularly to a construction method for constructing an adhesive (chemical) anchor that fixes an anchor member by a chemical reaction of an adhesive (capsule method or injection method).

  In the post-construction anchor method for construction and civil engineering, an adhesive anchor in which an anchor member is fixed to a perforation formed in a concrete structure by a chemical reaction of an adhesive (injection method or resin capsule method) has been widely used. . The adhesive anchor is first drilled into a concrete structure and filled with an adhesive (or a resin capsule is inserted). Then, anchor bolts such as full screw bolts or anchor members such as deformed steel bars are driven into this perforation, and the adhesive is hardened and cured to fix the anchor member to the concrete structure (for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-9239

  However, in the prior art, sufficient pulling strength may not be ensured due to deterioration of the adhesive over time or construction failure. Such post-installed anchors must be stopped, but if they are forcibly pulled out, there is a risk of destroying the concrete structure. Therefore, after constructing a construction anchor at a new location, a large-scale construction is required in which the fixed equipment is moved.

  The object of the present invention has been made in view of the above points, and the object of the present invention is to create a new structure using existing drilling, which allows the post-construction anchor to be pulled out without destroying the concrete structure. The object of the present invention is to provide a post-construction anchor construction method capable of constructing a construction anchor.

The post-construction anchor construction method of the present invention is the anchor member in which a tensile load is applied to the anchor member fixed to the perforation of the concrete structure with an adhesive while applying both heat and force or one of them. A pulling process for pulling out the adhesive member, an adhesive removing process for removing the adhesive remaining in the perforations from which the anchor member has been pulled out, and filling the perforations from which the adhesive has been removed by the adhesive removing process with a new adhesive And an anchor member driving step for driving a new anchor member into the perforations filled with the new adhesive by the adhesive filling step.
Further, in the post-construction anchor construction method of the present invention, the adhesive removing step may be a perforation diameter increasing step for expanding the diameter of the perforation through which the anchor member has been pulled out.
Further, in the post-construction anchor construction method according to the present invention, in the drilling diameter expanding step, a deep portion of the drilling is formed in an undercut type expansion hole, and in the anchor member driving step, an underarm is used as the new anchor member. A cut anchor may be driven.
Further, in the post-construction anchor construction method of the present invention, the pulling-out step includes a post-construction anchor pulling device comprising a strength reducing device that reduces the tensile strength of the adhesive and a tension device that applies a tensile load to the anchor member. May be used.
Furthermore, in the post-construction anchor construction method of the present invention, the tension device is provided with a load meter for measuring a tensile load applied to the anchor member, and the post-construction anchor pulling device is measured by the load meter. If the tensile load value exceeds the set upper limit tensile load value, a tension control device for notifying the upper limit load excess notification may be provided.
In the post-installation anchor construction method of the present invention, the tension device is provided with a load meter for measuring a tensile load applied to the anchor member, and the post-construction anchor pulling device is provided with a shaft of the anchor member. A displacement meter that measures the amount of displacement in the direction, and a displacement setting value that is set by the displacement meter without the tensile load value measured by the load meter exceeding the set load setting value. If it exceeds, a tension control device that turns on the yield strength reducing device may be provided.
Further, the post-construction anchor construction method of the present invention is an insertion hole formation in which an insertion hole is formed from a projecting end projecting from the concrete structure, with respect to an anchor member fixed to the perforation of the concrete structure by an adhesive. A heating step of inserting a rod-shaped heating means into the insertion hole to heat the anchor member, a pulling step of pulling out the anchor member after heating, and the adhesion remaining in the perforations from which the anchor member has been pulled out An adhesive removing step for removing the adhesive, an adhesive filling step for filling the perforations from which the adhesive has been removed by the adhesive removing step with a new adhesive, and the new adhesive by the adhesive filling step. An anchor member driving step of driving a new anchor member into the filled hole.
Further, in the post-installation anchor construction method of the present invention, in the insertion hole forming step, the insertion hole reaching the vicinity of the embedded end embedded in the concrete structure or the insertion hole penetrating through the embedded end is formed. You may make it do.
Further, the post-construction anchor construction method of the present invention reaches the vicinity of the embedded end of the anchor member embedded in the concrete structure with respect to the concrete structure in which the anchor member is fixed to the perforation by an adhesive. An insertion hole forming step for generating a drilling hole, a heating step for energizing and heating the anchor member through the drilling hole, a pulling step for pulling out the anchor member, and the hole remaining in the drilled hole from which the anchor member has been pulled out An adhesive removing step for removing the adhesive, an adhesive filling step for filling the perforations from which the adhesive has been removed by the adhesive removing step with a new adhesive, and the new adhesive by the adhesive filling step. An anchor member driving step for driving a new anchor member into the perforation filled with a hole, and a backfilling step for backfilling the hole. To.
Furthermore, in the post-construction anchor construction method of the present invention, in the pulling-out step, the anchor member may be pulled out while being rotated.
Further, the post-construction anchor pulling device of the present invention is a post-construction anchor pulling device that pulls out an anchor member fixed to the perforation of a concrete structure by an adhesive, and a strength reduction device that reduces the tensile strength by the adhesive; And a tension device for applying a tensile load to the anchor member.
Furthermore, in the post-construction anchor drawing device of the present invention, the yield strength reducing device may be a heating device that heats the anchor member.
Furthermore, in the post-construction anchor drawing device according to the present invention, the strength reducing device may be a force applying device that applies rotation, vibration, or striking force to the anchor member.
Furthermore, in the post-construction anchor drawing device according to the present invention, the tension device is provided with a load meter for measuring a tensile load applied to the anchor member, and an upper limit at which the tensile load value measured by the load meter is set. You may provide the tension control apparatus which alert | reports an upper limit load excess notification when a tension load value is exceeded.
Furthermore, in the post-construction anchor drawing device of the present invention, the tension device is provided with a load meter for measuring a tensile load applied to the anchor member, and a displacement meter for measuring an axial displacement amount of the anchor member; When the amount of displacement measured by the displacement meter exceeds the set displacement set value without exceeding the set load set value, the tensile strength value measured by the load meter is turned on. And a tension control device.

  According to the present invention, since the tensile strength determined by the adhesive force of the adhesive anchor can be reduced, the anchor member can be pulled out without destroying the concrete structure. Anchors can be constructed. Thereby, there exists an effect that it is not necessary to perform the large-scale construction of transfer of equipment.

It is sectional drawing which shows each work procedure of 1st Embodiment of the construction method of the post-construction anchor which concerns on this invention. It is a block diagram which shows the structure of the post-installation anchor drawing-out apparatus used for the drawing-out operation | work of the anchor member shown in FIG.1 (b). It is a side view of a tension device, a displacement meter, and a heating device shown in FIG. It is a longitudinal cross-sectional view of the tension device and the heating device shown in FIG. It is the top view and side view which show the structure of the tension operation apparatus and tension control apparatus which are shown in FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the post-installation anchor extraction apparatus shown in FIG. It is sectional drawing which shows each work procedure of 2nd Embodiment of the construction method of the post-construction anchor which concerns on this invention. It is sectional drawing which shows each work procedure of 3rd Embodiment of the construction method of the post-construction anchor which concerns on this invention.

Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.
(First embodiment)
In the post-installation anchor construction method according to the first embodiment, first, as shown in FIG. 1A, anchor bolts such as full thread bolts or anchor bars such as deformed steel bars are used with respect to existing adhesive anchors. The anchor member 2 is pulled out by applying a tensile load while applying a force such as heat, rotation, vibration, and striking force to the anchor member 2 (pulling process). In the existing adhesive anchor, the anchor member 2 is fixed to the perforations 4 formed in the concrete structure 3 with the adhesive 5. Therefore, the tensile strength of the adhesive 5 to which the anchor member 2 is fixed can be reduced by applying heat, rotation, vibration, striking force or the like to the anchor member 2. Thereby, since the tensile strength of the adhesive 5 can be made smaller than the tensile strength determined by the cone-shaped fracture of the concrete structure 3, the concrete structure 3 can be destroyed as shown in FIG. The anchor member 2 can be pulled out.

  Next, as shown by an arrow in FIG. 1C, the diameter of the drilled holes 4 already provided in the concrete structure 3 is increased using a core drill for expanding the diameter (drilling diameter increasing process). The drilling expansion process functions as an adhesive removal process that reliably removes the remaining adhesive 5, and after the anchor member 2 is pulled out, the adhesive 5 remaining in the drilling 4 can be reliably removed.

  Next, using a brush or a blower, the chips in the perforations 4 are removed (chip removal process), and the adhesive 5 is filled into the perforations 4 (or a resin capsule is inserted) (adhesive filling process). And as shown in FIG.1 (d), the anchor member 2 is driven in, the adhesive agent 5 is hardened and cured, and the anchor member 2 is fixed to the concrete structure 3 (anchor member driving process).

  In the drilling expansion step, an undercut drill may be used to form the back portion of the drilling 4 into an undercut type expansion hole, and the undercut anchor may be driven in the anchor member driving step.

  A post-construction anchor pulling device 1 shown in FIGS. 2 to 5 is used in a pulling process for pulling out the anchor member 2 by applying a tensile load while applying heat, rotation, vibration, striking force or the like to the anchor member 2. be able to.

  The post-construction anchor pulling device 1 is a device that pulls out an anchor member fixed with an adhesive 5 to a perforation 4 formed in a concrete structure. As shown in FIG. 2, a tensile load is applied to an anchor member such as an anchor bolt. A tensioning device 10 to be applied, a tensioning operation device 30 for operating the tensioning device 10, a displacement meter 40 for measuring the amount of axial displacement of the anchor member, a heating device 50 for heating the anchor member, and a tension control device 60 I have.

  As shown in FIGS. 3 and 4, the tension device 10 includes a reaction force table 12 having a plurality of legs 11, a reaction force table 12, and a center hole type hydraulic cylinder 13 that applies a tensile load to the anchor member 2. And a load meter 14 that is disposed between the reaction force table 12 and the hydraulic cylinder 13 and measures a tensile load value to the anchor member 2. A center hole type load cell is used for the load cell 14. The reaction table 12 is formed with a center hole. The center hole of the reaction table 12 and the center hole of the hydraulic cylinder 13 and the load cell 14 are through holes perpendicular to the reaction table 12. 15 is formed.

  Referring to FIGS. 3 and 4, a center shaft 17 is connected to the anchor member 2 fixed to the perforation 4 formed in the concrete structure 3 with an adhesive 5 via a coupling 16. The center shaft 17 is inserted into the through hole 15 of the tension device 10 from the reaction force table 12 side, and the plurality of legs 11 of the reaction force table 12 are in contact with the concrete structure 3. The center shaft 17 protrudes from the hydraulic cylinder 13 side. The protruding center shaft 17 is fitted with a washer plate 18 adapted to the center shaft 17, that is, having an opening slightly larger than the outer diameter of the center shaft 17. Further, an adjusting nut 19 corresponding to the screw diameter of the center shaft 17 is screwed in until it comes into contact with the washer plate 18. As a result, the reaction force table 12, the load meter 14, and the hydraulic cylinder 13 are interposed between the surface of the concrete structure 3 and the washer plate 18.

  The coupling 16 is a fastening member for fastening the anchor member 2 and the center shaft 17, and a plurality of types corresponding to the screw diameter of the anchor member 2 are prepared. Further, when the anchor member 2 has a length protruding from the hydraulic cylinder 13 side, the anchor member 2 can be adapted to the anchor member 2 without connecting the center shaft 17 via the coupling 16, that is, the outer diameter of the anchor member 2. A washer plate 18 having a slightly larger opening may be attached, and an adjustment nut 19 corresponding to the screw diameter of the anchor member 2 may be screwed in until the washer plate 18 is contacted.

  A tension operating device 30 is connected to the hydraulic cylinder 13. As shown in FIG. 5, the tension operation device 30 includes a hydraulic pump 31 and is connected to the hydraulic cylinder 13 via a hydraulic hose 32. 5A is a plan view of the tension operation device 30 and the tension control device 60, and FIG. 5B is a side view of the tension operation device 30 and the tension control device 60. The hydraulic oil is supplied from the hydraulic pump 31 to the hydraulic cylinder 13 by operating the lever 33 of the tension operating device 30. When the hydraulic oil is supplied, the piston rod 13a of the hydraulic cylinder 13 is extended, and a force acts on the washer plate 18 in a pulling direction away from the reaction platform 12 (the surface of the concrete structure 3). As a result, the washer plate 18, the adjustment nut 19, the center shaft 17, and the coupling 16 are integrated with the anchor member 2 in the tensile direction, so that a tensile load is applied to the anchor member 2. 3 and 4, the single acting type is used as the hydraulic cylinder 13, but a double acting type hydraulic cylinder may be adopted.

  The load meter 14 is provided with a main connector 20 and a displacement meter connector 21. The displacement meter 40 is attached to the anchor member 2 via the attachment stay 41 and measures the amount of axial displacement of the anchor member 2. The displacement amount measured by the displacement meter 40 is input to the displacement meter connector 21 and is input from the main connector 20 to the tension control device 60 together with the tensile load value measured by the load meter 14.

  The heating device 50 is provided on the connection side of the anchor member 2 in the coupling 16. As the heating device 50, for example, a high-frequency heating device can be used, and the heating coil 51 is wound around the anchor member 2. On / off of the heating device 50 is controlled by the tension control device 60. When the heating device 50 is turned on, that is, when a high-frequency current (alternating current) flows through the heating coil 51, the anchor member 2 itself generates heat, and rapid high-temperature heating becomes possible. 3 and 4, the power supply device that supplies a high-frequency current to the heating coil 51 and the control cable connected between the power supply cable and the tension control device 60 are omitted. Further, it is preferable that the coupling 16 and the center shaft 17 are made of a heat insulating material such as ceramic so that the heat generated by the anchor member 2 is not transmitted to the hydraulic cylinder 13 via the center shaft 17. Furthermore, when the coupling 16 is not used, the heating device 50 alone may be attached to the anchor member 2.

  As shown in FIG. 5, the tension control device 60 includes a display unit 61 such as a liquid crystal display, a setting operation unit 62 including various setting keys, a notification unit 63 such as a buzzer, and a control unit 64. . The control unit 64 is an information processing unit such as a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. A control program is stored in the ROM. The control unit 64 reads out the control program stored in the ROM, and executes various operations by developing the control program in the RAM.

Next, the extraction process using the post-installation anchor extraction apparatus 1 will be described in detail.
The post-construction anchor pulling device 1 can pull out the anchor member 2 after performing a nondestructive tensile confirmation test to confirm the tensile strength of the anchor member 2 and determining whether or not to continue pulling out the anchor member 2. it can.

  The operator first sets the tension device 10, the displacement meter 40 and the heating device 50 as shown in FIGS. 3 and 4, and sets the “load set value”, “displacement set value”, and “upper limit” using the setting operation unit 62. Set “Load setting value”. In this initial state, the heating device 50 is off. The “load setting value” and the “displacement setting value” are inputs for the nondestructive tensile confirmation test, and the “load setting value” is set to 40% of the tensile strength Ta of the anchor member 2, for example. . The tensile strength Ta of the anchor member 2 which is an adhesive anchor is determined by the tensile strength Ta1 determined by the yield of the anchor member 2 (hereinafter referred to as anchor tensile strength Ta1) and the cone-like fracture of the fixed concrete structure 3. The minimum value of the tensile strength Ta2 (hereinafter referred to as concrete tensile strength Ta2) and the tensile strength Ta3 (hereinafter referred to as adhesive tensile strength Ta3) determined by the adhesive strength of the adhesive 5 (adhesive anchor). . Further, the “upper limit load set value” is a tensile load value that may damage the concrete structure 3 (formed perforations 4) and the anchor member 2, and is higher than the “load set value” and the anchor tensile strength Ta1. And a value lower than the concrete tensile strength Ta2.

  The operator increases the tensile load applied to the anchor member 2 by operating the lever 33 of the tension operation device 30. The control unit 64 of the tension control device 60 compares the tensile load value measured by the load meter 14 with the “load set value”, and also compares the displacement amount measured by the displacement meter 40 with the “displacement set value”. And comparing. When the tensile load value measured by the load meter 14 exceeds the “load setting value”, the control unit 64 notifies the operator of the “load setting arrival notification” using the display unit 61 and the notification unit 63. When the displacement amount measured by the displacement meter 40 exceeds the “displacement set value”, the “displacement amount excess notification” is notified to the operator using the display unit 61 and the notification unit 63. Thus, when the “load setting arrival notification” is notified without the “displacement excess notification” being notified, the operator determines that the tensile strength of the anchor member 2 is sufficiently provided. The anchor member 2 can be pulled out.

  Further, when the displacement measured by the displacement meter 40 exceeds the “displacement set value” without the tensile load value measured by the load meter 14 exceeding the “load set value”, the control unit 64 heats the heating device 50. Turn on. As a result, a high-frequency current (alternating current) flows through the heating coil 51, the anchor member 2 itself generates heat, and heat is transmitted to the adhesive 5 fixing the anchor member 2. The control unit 64 displays that the displacement measured by the displacement meter 40 has exceeded the “displacement set value” without the tensile load value measured by the load meter 14 exceeding the “load set value”. The worker may be notified using 61 or the notification unit 63 so that the worker turns on the heating device 50.

  The adhesive tensile strength Ta3 can be calculated by Ta3 = τa · π · da · le. Here, τa is the adhesion strength of the adhesive anchor, da is the diameter of the anchor member 2, and le is the embedding length of the anchor member 2. Therefore, when heat is transmitted to the adhesive 5 to which the anchor member 2 is fixed, and the adhesion strength τa of the adhesive anchor is reduced, the adhesive tensile strength Ta3 can be reduced. This is particularly effective when the adhesive 5 fixing the anchor member 2 is an organic resin such as an epoxy resin, and can greatly reduce the adhesive tensile strength Ta3.

  When the adhesive tensile strength Ta3 is lower than the anchor tensile strength Ta1 and the concrete tensile strength Ta2, the lever 33 of the tension operating device 30 is operated to apply a tensile load exceeding the adhesive tensile strength Ta3 to the anchor member 2. The anchor member 2 can be pulled out without damaging the anchor member 2 or the concrete structure 3 (the formed perforations 4).

  Further, the control unit 64 compares the tensile load value measured by the load meter 14 with the “upper limit load set value” after turning on the heating device 50. Then, when the tensile load value measured by the load meter 14 exceeds the “upper limit load set value”, the control unit 64 notifies the operator of “upper limit load excess notification” using the display unit 61 and the notification unit 63. . By the “upper limit load over notification”, the operator can recognize the possibility of damaging the concrete structure 3 (formed perforation 4) or the anchor member 2 and can interrupt the operation of the lever 33 of the tension operating device 30. become. Accordingly, heat is not sufficiently transmitted to the adhesive 5 fixing the anchor member 2, and an excessive tensile load, that is, in a state where the adhesive tensile strength Ta3 exceeds the anchor tensile strength Ta1 and the concrete tensile strength Ta2, that is, It is possible to prevent a tensile load exceeding the anchor tensile strength Ta1 and the concrete tensile strength Ta2 from being applied to the anchor member 2.

  In addition, it comprised so that the adhesive agent tensile strength Ta3 might be reduced by heating the anchor member 2 with the heating apparatus 50. FIG. That is, the heating device 50 is adopted as a yield strength reducing device for reducing the adhesive tensile strength Ta3. However, as shown in FIG. 6, the strength reduction device for reducing the adhesive tensile strength Ta3 is rotated with respect to the anchor member 2. Further, a force applying device 70 that applies vibration or striking force may be provided. That is, when the adhesive 5 has deteriorated over time, the adhesion strength of the adhesive anchor can be reduced by applying rotation, vibration or striking force to the anchor member 2.

For example, as shown in FIG. 6, as the force applying device 70 that applies rotation to the anchor member 2, a locking nut 19 a is attached and fixed to the center shaft 17, and the rotational force of the motor 71 using a gear or the like. May be transmitted to the anchor member 2 via the center shaft 17.
Further, as the force applying device 70 for applying vibration to the anchor member 2, the rotational force of the motor 71 is converted into vibration in the axial direction of the center shaft 17 by a known vibration mechanism (ratchet mechanism or the like) with a vibration drill or the like. The anchor member 2 may be transmitted.
Further, as the applying device 70 for applying a striking force to the anchor member 2, it is preferable to convert the striking force in the axial direction of the center shaft 17 by a known hammer vibration mechanism using a hammer drill or the like and transmit it to the anchor member 2. .

As described above, in the first embodiment, a tensile load is applied to the anchor member 2 fixed to the perforation 4 of the concrete structure 3 with the adhesive 5 while applying both heat and / or force. In addition, a pulling process for pulling out the anchor member 2, an adhesive removing process for removing the adhesive 5 remaining in the perforations 4 from which the anchor member 2 has been pulled out, and a new drilling 4 in which the adhesive 5 has been removed by the adhesive removing process. An adhesive filling step for filling the adhesive 5 and an anchor member driving step for driving a new anchor member 2 into the perforations 4 filled with the new adhesive 5 by the adhesive filling step are provided.
With this configuration, the adhesive tensile strength Ta3 can be reduced. Therefore, the anchor member can be used without destroying the concrete structure 3 in a state where the adhesive tensile strength Ta3 is lower than the anchor tensile strength Ta1 and the concrete tensile strength Ta2. Can be pulled out. Thereby, a new anchor can be constructed using the existing perforations 4 formed in the concrete structure 3, and a large-scale construction such as relocation of equipment does not have to be performed.

Furthermore, in the first embodiment, the adhesive removing step is a perforation diameter increasing step for expanding the diameter of the perforation 4 from which the anchor member 2 has been pulled out.
With this configuration, it is possible to reliably remove the adhesive 5 remaining in the perforations 4 from which the anchor member 2 has been pulled out.

Further, in the first embodiment, in the drilling diameter expanding step, the back portion of the drilling 4 is formed in an undercut type expansion hole, and in the anchor member driving step, an undercut anchor is driven as a new anchor member 2. .
With this configuration, a stronger post-construction anchor can be constructed.

Furthermore, in the first embodiment, the pulling-out process includes a yield strength reducing device (heating device 50, force applying device 70) that reduces the tensile strength due to the adhesive 5, and a tension device 10 that applies a tensile load to the anchor member 2. After that, the construction anchor drawing device 1 is used.
With this configuration, the drawing process can be easily performed.

Furthermore, in the first embodiment, the tension device 10 is provided with a load meter 14 that measures a tensile load applied to the anchor member 2, and the post-construction anchor pulling device 1 is a tensile load measured by the load meter 14. When the value exceeds the set upper limit tensile load value, a tension control device 60 is provided to notify an upper limit load excess notification.
With this configuration, it is possible to prevent an excessive tensile load, that is, a tensile load exceeding the anchor tensile strength Ta1 and the concrete tensile strength Ta2 from being applied to the anchor member 2.

Further, in the first embodiment, the post-construction anchor pulling device 1 includes a displacement meter 40 that measures the amount of displacement of the anchor member 2 in the axial direction, and the tension control device 60 is a tensile load value measured by the load meter 14. When the displacement measured by the displacement meter 40 exceeds the set displacement set value without exceeding the set load set value, the proof stress reducing device (heating device 50, force applying device 70) is turned on. It is configured.
With this configuration, the anchor member 2 can be pulled out while performing a nondestructive tensile confirmation test.

In addition, the first embodiment is a post-construction anchor pulling device 1 for pulling out the anchor member 2 fixed to the perforation of the concrete structure 3 by an adhesive, and the strength reducing device for reducing the adhesive tensile strength Ta3 by the adhesive (Heating device 50, force device 70) and tension device 10 for applying a tensile load to anchor member 2 are provided.
With this configuration, the adhesive tensile strength Ta3 can be reduced. Therefore, the anchor member can be used without destroying the concrete structure 3 in a state where the adhesive tensile strength Ta3 is lower than the anchor tensile strength Ta1 and the concrete tensile strength Ta2. Can be pulled out. Thereby, a new anchor can be constructed using the existing perforations formed in the concrete structure 3, and it is not necessary to perform a large-scale construction such as transfer of equipment.

Further, in the first embodiment, the tension device 10 is provided with a load meter 14 for measuring a tensile load applied to the anchor member 2, and an upper limit tensile load in which a tensile load value measured by the load meter 14 is set. When the value is exceeded, a tension control device 60 is provided to notify an upper limit load excess notification.
With this configuration, it is possible to prevent an excessive tensile load, that is, a tensile load exceeding the anchor tensile strength Ta1 and the concrete tensile strength Ta2 from being applied to the anchor member 2.

Furthermore, 1st Embodiment is provided with the displacement meter 40 which measures the displacement amount of the axial direction of the anchor member 2, and the tension control apparatus 60 sets the load setting value by which the tensile load value measured by the load meter 14 was set. Without exceeding, when the displacement measured by the displacement meter 40 exceeds the set displacement set value, the proof stress reducing device (heating device 50, force device 70) is turned on.
With this configuration, the anchor member 2 can be pulled out while performing a nondestructive tensile confirmation test.

(Second Embodiment)
In the post-construction anchor construction method of the second embodiment, first, as shown in FIG. 7A, the anchor member 2 fixed to the perforation 4 of the concrete structure 3 with the adhesive 5 is used as shown in FIG. As shown in b), the insertion hole 6 reaching from the protruding end 2A protruding from the concrete structure 3 to at least the vicinity of the embedded end 2B embedded in the concrete structure 3 is formed using a drilling machine (drill). (Insertion hole forming step). In addition, cutting when forming the insertion hole 6 is good to cool using a "water circulation system", and to collect dust using a "dust collector". In the example shown in FIG. 7, the insertion hole 6 is formed as a through hole that penetrates the embedded end 2 </ b> B of the anchor member 2. By forming the insertion hole 6 as a through hole in this way, the insertion hole 6 that reaches the vicinity of the embedded end 2B can be easily formed even when the embedded length of the anchor member 2 is unknown.

  Next, as shown in FIG.7 (c), the rod-shaped heating means 7 is inserted in the insertion hole 6, and the anchor member 2 is heated (heating process). As the rod-shaped heating means 7, for example, an electric resistance heating type or high frequency heating type bolt heater used for heating a perforated bolt can be used. The anchor member 2 is heated by the rod-shaped heating means 7 without damaging the concrete structure 3 for the purpose of embrittlement of the adhesive 5, in particular, embrittlement of the adhesive surface of the adhesive 5 with the anchor member 2. Therefore, it is important to uniformly heat the entire contact portion of the anchor member 2 with the adhesive 5 and control the amount of heat transmitted to the adhesive 5. In the second embodiment, since the insertion hole 6 is formed up to the vicinity of the embedded end 2B, the entire contact portion of the anchor member 2 with the adhesive 5 can be uniformly heated by the rod-shaped heating means 7. Then, by appropriately setting the heat generation temperature of the rod-shaped heating means 7 (electric resistance heating type) itself or the heat generation temperature of the anchor member 2 by the rod-shaped heating means 7 (high-frequency heating type) and the heat generation time, the anchor member 2 It is possible to control the amount of heat transferred to the adhesive 5 and embrittle the adhesive 5 without damaging the concrete structure 3.

  Next, the anchor member 2 after heating is pulled out (pulling process), and the process after the drilling diameter expanding process of the first embodiment is performed, thereby fixing the new anchor member 2 to the concrete structure 3. In the drawing process, when the anchor member 2 is an anchor bolt such as a full screw bolt, a double nut (not shown) is attached to the anchor member 2 and an impact wrench or the like is used, as shown in FIG. It can be pulled out by rotating the anchor member 2 in the loosening direction. As shown in FIG. 7A, when the embedded end 2B of the anchor member 2 is cut obliquely, the adhesive reservoir 5a of the adhesive 5 is in contact with the embedded end 2B cut obliquely. Is formed. Since the adhesive reservoir 5a hinders rotation around the axis of the anchor member 2, when the anchor member 2 is pulled out while being rotated, the adhesive reservoir 5a needs to be sufficiently embrittled in the heating step. is there. In order to sufficiently embrittle the adhesive reservoir 5a, it is preferable to form the insertion hole 6 as a through-hole and to directly heat the adhesive reservoir 5a by using an electric resistance heating type as the rod-shaped heating means 7. . That is, in the adhesive reservoir 5a, the amount of the adhesive 5 is larger than that in other locations, but by heating directly with the rod-shaped heating means 7, a larger amount of heat can be applied than in other locations. .

As described above, in the second embodiment, the insertion hole 6 is formed from the protruding end 2A protruding from the concrete structure 3 with respect to the anchor member 2 fixed to the perforation 4 of the concrete structure 3 by the adhesive 5. An insertion hole forming step to be formed, a heating step in which a rod-shaped heating means 7 is inserted into the insertion hole 6 to heat the anchor member 2, a pulling out process for pulling out the anchor member 2 after heating, and a drilling in which the anchor member 2 is pulled out 4 is removed by an adhesive removing step for removing the adhesive 5 remaining in the adhesive 4, an adhesive filling step for filling the perforations 4 from which the adhesive 5 has been removed by the adhesive removing step, and an adhesive filling step. An anchor member driving step of driving a new anchor member 2 into the perforations 4 filled with the appropriate adhesive 5.
With this configuration, the anchor member 2 can be heated quickly and uniformly, so that the adhesive 5 can be easily embrittled in a short time, and the anchor member 2 can be easily pulled out.

Furthermore, in the second embodiment, in the insertion hole forming step, the insertion hole 6 reaching the vicinity of the embedded end 2B of the anchor member 2 in the concrete structure 3 or the insertion hole 6 penetrating through the embedded end 2B is formed.
With this configuration, since heat is easily transmitted to the adhesive reservoir 5a in the heating step, the adhesive reservoir 5a can be sufficiently embrittled and the anchor member 2 can be easily pulled out. When the insertion hole 6 that penetrates the embedded end 2B is formed, the insertion hole 6 reaching the vicinity of the embedded end 2B can be easily formed even when the embedded length of the anchor member 2 is unknown.

Further, in the second embodiment, in the pulling process, the anchor member is pulled while being rotated.
With this configuration, when the anchor member 2 is an anchor bolt such as a full screw bolt, the anchor member 2 can be easily pulled out using an impact wrench or the like.

(Third embodiment)
In the post-construction anchor construction method according to the third embodiment, first, as shown in FIG. 8A, the anchor member 2 is anchored to the concrete structure 3 in which the anchor member 2 is fixed to the perforations 4 by the adhesive 5. 2 is formed by using a drilling machine (drill) (hole forming step).

  Next, as shown in FIG. 8 (b), one terminal 91 processed into a rod shape of the electric heating device 90 is inserted into the hole 8 and brought into contact with the vicinity of the embedded end 2 </ b> B of the anchor member 2. The other terminal 92 of 90 is brought into contact with the vicinity of the protruding end 2A of the anchor member 2 and the anchor member 2 is energized and heated (heating process). Similar to the second embodiment, this heating is also performed for the purpose of embrittlement of the adhesive 5, in particular, embrittlement of the adhesive surface of the adhesive 5 with the anchor member 2 without damaging the concrete structure 3. When the anchor member 2 is energized and heated, the anchor member 2 itself generates heat uniformly, so that the amount of heat transmitted to the adhesive 5 can be easily controlled.

  Next, the anchor member 2 after heating is pulled out (pulling process), and the processes after the drilling diameter expanding process of the first embodiment are performed to fix the new anchor member 2 to the concrete structure 3, and finally Then, the hole 8 is backfilled using the adhesive 5 or mortar (backfilling step). The hole 8 can be used as a confirmation hole for confirming the filling state of the adhesive 5 in the adhesive filling step. The backfilling material used for backfilling the hole 8 may be made of a material that does not deteriorate the strength of the concrete structure 3 due to the backfilling of the hole 8.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention.
For example, in the present embodiment, the anchor member 2 and the center shaft 17 are fastened by the coupling 16, but the anchor member 2 and the center shaft 17 may be fastened by welding.

DESCRIPTION OF SYMBOLS 1 Post-construction anchor drawing device 2 Anchor member 2A Protruding end 2B Embedded end 3 Concrete structure 4 Drilling 5 Adhesive 5a Adhesive reservoir 6 Insertion hole 7 Bar-shaped heating means 8 Drilling hole 10 Pulling device 11 Leg 12 Reaction counter 13 Hydraulic cylinder 13a Piston rod 14 Load meter 15 Through hole 16 Coupling 17 Center shaft 18 Washer plate 19 Adjustment nut 19a Loosening prevention nut 20 Main connector 21 Displacement meter connector 30 Tension operating device 31 Hydraulic pump 32 Hydraulic hose 33 Lever 40 Displacement meter 41 Attachment stay 50 Heating device 51 Heating coil 60 Tension control device 61 Display unit 62 Setting operation unit 63 Notification unit 64 Control unit 70 Force device 71 Motor 90 Current heating device 91, 92 Terminal

Claims (15)

A drawing step of pulling out the anchor member by applying a tensile load while applying both heat and / or force to the anchor member fixed to the perforation of the concrete structure by an adhesive;
An adhesive removing step of removing the adhesive remaining in the perforations from which the anchor member has been pulled out;
An adhesive filling step of filling the perforations from which the adhesive has been removed by the adhesive removal step with a new adhesive;
A post-installation anchor construction method comprising: an anchor member driving step of driving a new anchor member into the perforation filled with the new adhesive by the adhesive filling step.   The post-installation anchor construction method according to claim 1, wherein the adhesive removing step is a perforation diameter increasing step for expanding the diameter of the perforation through which the anchor member has been pulled out. In the drilling diameter expansion step, the back part of the drilling is formed into an undercut type expansion hole,
The post-installed anchor construction method according to claim 2, wherein, in the anchor member driving step, an undercut anchor is driven as the new anchor member.   2. The pulling step is performed using a post-construction anchor pulling device including a yield strength reducing device for reducing the tensile strength due to the adhesive and a tension device for applying a tensile load to the anchor member. The construction method of the post-construction anchor in any one of thru | or 3. The tension device is provided with a load meter for measuring a tensile load applied to the anchor member,
5. The post-installation anchor drawing device includes a tension control device that notifies an upper limit load excess notification when a tensile load value measured by the load meter exceeds a set upper limit tensile load value. Construction method of construction anchor after description. The tension device is provided with a load meter for measuring a tensile load applied to the anchor member,
The post-construction anchor drawing device includes a displacement meter that measures the amount of axial displacement of the anchor member, and a tensile load value measured by the load meter without exceeding a set load setting value. The post-construction anchor construction method according to claim 4, further comprising a tension control device that turns on the yield strength reducing device when the measured displacement amount exceeds a set displacement set value. An insertion hole forming step for forming an insertion hole from a protruding end protruding from the concrete structure, with respect to the anchor member fixed to the perforation of the concrete structure by an adhesive,
A heating step of heating the anchor member by inserting a rod-shaped heating means into the insertion hole;
A drawing step of pulling out the anchor member after heating;
An adhesive removing step of removing the adhesive remaining in the perforations from which the anchor member has been pulled out;
An adhesive filling step of filling the perforations from which the adhesive has been removed by the adhesive removal step with a new adhesive;
A post-installation anchor construction method comprising: an anchor member driving step of driving a new anchor member into the perforation filled with the new adhesive by the adhesive filling step.   8. The insertion hole forming step includes forming the insertion hole reaching the vicinity of an embedded end embedded in the concrete structure or the insertion hole penetrating through the embedded end. Construction method of construction anchor. For a concrete structure in which the anchor member is fixed to the perforation by an adhesive, a hole forming step for forming a hole that reaches the vicinity of the embedded end of the anchor member embedded in the concrete structure;
A heating step of energizing and heating the anchor member through the hole,
A drawing step of pulling out the anchor member;
An adhesive removing step of removing the adhesive remaining in the perforations from which the anchor member has been pulled out;
An adhesive filling step of filling the perforations from which the adhesive has been removed by the adhesive removal step with a new adhesive;
An anchor member driving step of driving a new anchor member into the perforation filled with the new adhesive by the adhesive filling step;
A post-installation anchor construction method comprising a backfilling step of backfilling the hole.   The post-construction anchor construction method according to any one of claims 7 to 9, wherein in the extraction step, the anchor member is pulled out while being rotated. It is a construction anchor pulling device after pulling out an anchor member fixed with an adhesive to drilling a concrete structure,
A strength reducing device for reducing the tensile strength by the adhesive;
A post-construction anchor drawing device comprising a tension device that applies a tensile load to the anchor member.   The post-construction anchor drawing device according to claim 11, wherein the yield strength reducing device is a heating device that heats the anchor member.   The post-construction anchor drawing device according to claim 11 or 12, wherein the yield strength reducing device is a force applying device that applies rotation, vibration, or striking force to the anchor member. The tension device is provided with a load meter for measuring a tensile load applied to the anchor member,
The apparatus according to any one of claims 11 to 13, further comprising a tension control device that notifies an upper limit load excess notification when a tensile load value measured by the load meter exceeds a set upper limit tensile load value. Post-installation anchor extraction device. The tension device is provided with a load meter for measuring a tensile load applied to the anchor member,
A displacement meter for measuring an axial displacement amount of the anchor member;
The tensile load value measured by the load meter does not exceed the set load setting value, and the tensile force that turns on the yield strength reducing device when the displacement amount measured by the displacement meter exceeds the set displacement set value. The post-construction anchor drawing device according to claim 11, further comprising a control device.

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