Preceding injection type fixing anchor installation method

Abstract

To improve work efficiency for installation by using a lightweight and divertible jig while securing anchor bolt installation accuracy, to reduce manufacturing and installation costs, and to reduce disposal costs of members.SOLUTION: A fixing anchor installation method includes the steps of: marking a vertical reference mark passing through the center of an anchor hole on a wall surface of an existing skeleton wall; using a positioning fitting having a reference surface to fix the positioning fitting detachably to the wall surface by aligning the reference surface with a horizontal line passing through a lower end of an anchor bolt arranged coaxially with the anchor hole; inserting the anchor bolt into the anchor hole and making a lower end of a base end part of the anchor bolt abut on the reference surface; pressing the base end part of the anchor bolt against the reference surface from above by a pressing member so as to regulate the vertical movement of the anchor bolt; positioning a reference line extending in a direction orthogonal to the wall surface on the extension line of the vertical reference mark; and fixing the presser member in a state in which the lateral movement of the presser member is restricted after making an anchor axial direction of the anchor bolt coincide with the reference line when viewed from above.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a pre-injection anchor installation method. [Background technology]

[0002] In the past, bridge reinforcement work required high installation precision for the level and center position of the anchor bolts that were installed in advance, because the anchor bolt hole diameter of the steel bracket to be installed was small and the base plate was thick. This made the work more difficult and time-consuming. A conventional method for installing a fixed anchor is to insert an anchor bolt into an anchor hole, and then install an injection pipe and an air vent pipe that communicate with the inside of the anchor hole with a sealant at the hole opening, and then close the hole opening. A post-injection method is known in which a fixing material such as epoxy resin is injected into the anchor hole using the injection pipe (see, for example, Patent Document 1).

[0003] Another method of installation that can improve the accuracy of the installation of anchor bolts is to use a template made of ordinary plywood with a batten attached to it. The template has holes pre-drilled in the same locations as the drilled holes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-11142 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional anchor bolt installation method using the above-mentioned injection pipe, air vent pipe and sealant, two types of pipe materials are inserted in advance and placed in the gap between the anchor hole and the anchor bolt, so when aligning the anchor bolt, the pipe materials inserted in advance become an obstacle to alignment, which is a major factor in causing deviation of the hole center position in the anchor bolt. Therefore, in bridge reinforcement work that requires high installation accuracy of the above-mentioned anchor bolts, the current situation is that it is difficult to guarantee high installation accuracy during construction with the post-injection method.

[0006] In addition, when using a template to install anchor bolts, the template is made to match the position of the drilled anchor hole in order to improve the installation accuracy of the anchor. Therefore, a new template must be made for each location where an anchor bolt is to be installed, which increases the material costs and labor costs involved in manufacturing. Furthermore, if the dimensions of the steel bracket attached to the installation surface (wall surface) of the anchor bolt are large, the weight of the template also increases, making it difficult and labor-intensive to load and unload the template onto the scaffolding and to handle it, so there was room for improvement in this regard. Furthermore, in this case, the template cannot be reused for each installation location of the anchor bolt, and a template must be produced for each location where it is to be used, which increases the amount of industrial waste discharged.

[0007] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a pre-injection type fixed anchor installation method that can improve the efficiency of installation work by using a lightweight and reusable jig while ensuring the installation accuracy of the anchor bolt, and also reduce the costs of manufacturing and installation as well as the cost of disposing of components. [Means for solving the problem]

[0008] In order to achieve the above object, a first aspect of the pre-injection type fixing anchor installation method of the present invention is a fixing anchor installation method for installing an anchor bolt in an anchor hole drilled in an existing structural wall to be reinforced, the method comprising the steps of: marking a vertical reference mark passing through the center of the anchor hole on a wall surface of the existing structural wall; using a positioning metal fitting having a reference surface, and removably fixing the positioning metal fitting to the wall surface by aligning the reference surface with a horizontal line passing through a lower end of the anchor bolt arranged coaxially with the anchor hole; inserting the anchor bolt into the anchor hole and abutting the lower end of the base end of the anchor bolt against the reference surface; pressing the base end of the anchor bolt against the reference surface from above with a pressing member to restrict vertical movement of the anchor bolt; and fixing the anchor bolt in a state in which lateral movement of the pressing member is restricted after aligning the anchor axial direction of the anchor bolt with an extension line of the vertical reference mark.

[0009] In the pre-injection type anchor installation method according to the present invention, the vertical and horizontal positions of the anchor bolt inserted into the anchor hole can be determined using a positioning metal fitting and a presser member. Furthermore, the central axes of the anchor bolt and the anchor hole can be precisely aligned by a simple positioning operation of aligning the anchor axis direction with a vertical reference mark marked on the wall surface of the existing structural wall. Then, by fixing the positioned anchor bolt to the positioning metal fitting with a presser member, the base end of the anchor bolt can be supported at a predetermined height, so that the tip side of the anchor bolt located at the back side of the anchor hole can be held horizontally within the anchor hole. In this way, the present invention can ensure the installation accuracy of the anchor bolt.

[0010] In addition, in the pre-injection type fixing anchor installation method according to the present invention, the vertical and horizontal positions of the anchor bolt can be adjusted using a jig consisting of a lightweight positioning metal fitting with a reference surface and a simple structure capable of fixing a pressing member, and a pressing member having only the function of pressing the anchor bolt from above. Furthermore, since the jig is for attaching the positioning metal fitting to the position of the anchor hole, it can be diverted to install other anchor bolts. Therefore, there is no need to manufacture a positioning metal fitting for each installation location of the anchor bolt, which improves the work efficiency of the jig installation and further reduces the costs of manufacturing and installing the jig. Moreover, since the positioning metal fitting and pressing member can be diverted, the costs of disposing of the members can be reduced.

[0011] In addition, the present invention can adopt a pre-injection method that does not use the conventional post-injection method for the fixing material, and the anchor bolt is inserted into the anchor hole after the fixing material is injected into the anchor hole. Therefore, it is not necessary to install the injection pipe, air vent pipe, and sealant used in the post-injection method, and it is possible to improve work efficiency, shorten the construction period, and reduce the cost of auxiliary materials. Furthermore, since the jig of the present invention is composed of a positioning fitting and a pressure member, it can be made a lightweight jig, making it easier to load and unload onto scaffolding and to handle on the scaffolding, thereby reducing the effort and cost required for the work.

[0012] Moreover, in a second aspect of the present invention, in the method for installing a pre-injection type fixed anchor of the first aspect, it is preferable to further include the steps of providing a reference line extending in a direction perpendicular to the wall surface, restricting vertical movement of the anchor bolt, and then positioning the reference line on an extension of the vertical reference mark, and aligning the anchor axial direction of the anchor bolt with the reference line when viewed from above, and then fixing the pressing member in a state in which lateral movement of the pressing member is restricted.

[0013] In this case, the central axes of the anchor bolt and the anchor hole can be aligned more precisely by a simple positioning operation of aligning the anchor axis direction with a vertical reference mark marked on the wall surface of the existing structural wall and a reference line, such as a laser line, extending in a direction perpendicular to the wall surface.

[0014] In addition, in a third aspect of the present invention, in the pre-injection type fixing anchor installation method of the first aspect, it is preferable that the pressing member holds at least an upper half of the anchor bolt and is arranged to be supportable by the positioning metal fitting in a state in which the anchor bolt is pressed from above.

[0015] In this case, a pressing member shaped to fit the outer periphery of the anchor bolt, such as a U-bolt, can be used, making it possible to support the anchor bolt by pressing it against the reference surface of the positioning fitting with a simple structure.

[0016] In addition, in a fourth aspect of the present invention, in the pre-injection type fixed anchor installation method of the third aspect, it is preferable that the pressing member is supported on the reference surface so as to be movable in a lateral direction perpendicular to the anchor axial direction in a horizontal plane.

[0017] In this case, since the pressing member is movable laterally relative to the reference surface, the lateral position of the anchor bolt can be finely adjusted while the anchor bolt is kept pressed against the reference surface.

[0018] Furthermore, in aspect 5 of the present invention, in the pre-injection type fixing anchor installation method of aspect 1, the positioning fitting has an abutment surface that is perpendicular to the reference surface and parallel to the wall surface and capable of surface contact, and it is preferable that the reference surface and the abutment surface are formed integrally.

[0019] In this case, by abutting the abutment surface against the wall surface of the existing structural wall, the positioning bracket can be fixed to the wall surface in a stably installed state, preventing the reference surface from shifting after the positioning bracket is installed on the wall surface, and increasing the reliability of the installation accuracy of the anchor bolt.

[0020] In addition, in a sixth aspect of the present invention, in the pre-injection type fixed anchor installation method of the second aspect, it is preferable that an anchor axis line extending in the anchor axial direction is marked on an outer circumferential surface of a base end side of the anchor bolt, and the anchor axis line is made to coincide with the reference line when the pressing member is fixed in a state in which the lateral movement of the pressing member is restricted.

[0021] In this case, by aligning the anchor axis line marked on the anchor bolt with a reference line such as a laser line, the anchor axis of the anchor bolt can be easily aligned with the central axis of the anchor hole in the lateral direction.

[0022] In addition, in a seventh aspect of the present invention, in the pre-injection type fixing anchor installation method of the first aspect, it is preferable to mark the wall surface of the existing structural wall with a level reference mark located on the horizontal line.

[0023] In this case, by aligning the reference surface of the positioning fitting with the level reference mark marked on the wall surface, the positioning fitting can be easily attached to the wall surface with the reference surface positioned at the position of the lower end of the anchor bolt that is arranged coaxially with the anchor hole.

[0024] In addition, in aspect 8 of the present invention, in the pre-injection type fixed anchor installation method of aspect 2, it is preferable to provide a laser irradiation unit that irradiates a laser that is the reference line in a direction perpendicular to the wall surface, and to position the laser on an extension line of the vertical reference mark marked on the wall surface by moving the laser irradiation unit parallel to the wall surface.

[0025] In this case, by positioning the laser line of the laser emitted from the laser irradiation unit on an extension of the vertical reference mark, it is possible to form the reference line that coincides with the central axis of the anchor hole when viewed from above. Therefore, by aligning the anchor axis direction with the laser line that serves as the reference line, it is easy to position the anchor bolt in the lateral direction.

[0026] In addition, in a ninth aspect of the present invention, in the pre-injection type fixed anchor installation method of the eighth aspect, it is preferable that the anchor axial direction of the anchor bolt is aligned with the laser line of the laser when viewed from above, and then the pressing member is fixed to the positioning metal fitting.

[0027] In this case, the anchor bolt is positioned laterally by aligning the anchor axis direction with the laser line that serves as the reference line, and then the anchor bolt is fixed to the positioning fitting with a pressure member, thereby firmly holding the anchor bolt in the final positioned position so that it does not move.

[0028] In addition, in aspect 10 of the present invention, in the pre-injection type fixing anchor installation method of aspect 1, it is preferable to inject a fixing material into the anchor hole and remove the positioning fitting and the pressing member from the wall surface after the fixing material has hardened.

[0029] In this case, after the fixing material has hardened, the positioning metal fitting and the pressing member are removed from the wall surface, releasing the anchor bolt from its supported state, so that the anchor bolt can be installed with precision without shifting during hardening. Effect of the Invention

[0030] According to the pre-injection type fixing anchor installation method of the present invention, it is possible to improve the efficiency of installation work by using a lightweight, reusable jig while ensuring the accuracy of anchor bolt installation. Furthermore, according to the pre-injection type fixing anchor installation method of the present invention, the costs associated with manufacturing and installing the jig can be reduced, and the costs associated with disposing of components can also be suppressed. [Brief description of the drawings]

[0031] [Figure 1] 1 is a cross-sectional view showing a configuration of an anchor bolt installation method according to an embodiment of the present invention. FIG. [Diagram 2] 2 is a front view of the anchor bolt shown in FIG. 1, as viewed from the side facing a wall surface. [Diagram 3] FIG. [Figure 4] This is a plan view of the positioning fitting as seen from above. [Diagram 5] 13 is a plan view showing the positioning jig and the position adjustment means attached to a wall surface, as viewed from above. FIG. [Figure 6] 1 is a front view showing a wall surface on which a vertical reference mark and a level reference mark are marked at the opening of an anchor hole. FIG. [Figure 7] 7 is a perspective view showing a state in which a positioning metal fitting is attached to the wall surface shown in FIG. 6. [Figure 8] 4 is a cross-sectional view showing the state in which a fixing material is injected into an anchor hole. FIG. [Figure 9] FIG. 4 is a cross-sectional view showing a state in the middle of inserting an anchor bolt into an anchor hole. [Figure 10] 1 is a cross-sectional view showing the state in which the anchor bolt is inserted into the anchor hole and the U-bolt is supported by the positioning fitting. [Figure 11] FIG. 11 is a perspective view showing a state in which the anchor axis mark of the anchor bolt is aligned with the laser line irradiated from the laser irradiation unit and the vertical reference mark. [Figure 12] FIG. 12 is a perspective view showing a state in which the anchor bolt is misaligned in the left-right direction before the anchor axis marks are aligned in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for installing a pre-injection anchor according to an embodiment of the present invention will be described with reference to the drawings.

[0033] 1 and 2, the method for installing a fixing anchor in this embodiment is a pre-injection method for installing an anchor bolt 3 in an anchor hole 21 drilled in an existing structural wall 2 to be reinforced. In the method for installing a fixing anchor, a fixing material 22 is injected into the anchor hole 21, and the anchor bolt 3 is inserted into the anchor hole 21 before the fixing material 22 hardens, and the position of the anchor bolt 3 is adjusted using a positioning jig 10 and a position adjustment means 40 (see FIG. 5). Here, the hole center (central axis) of the anchor hole 21 is indicated by the symbol O, and the anchor axis of the anchor bolt 3 is indicated by the symbol C.

[0034] The existing structural wall 2 is, for example, a reinforced concrete bridge in bridge reinforcement work. A wall surface 2A of the existing structural wall 2 on which the anchor bolt 3 is installed is formed in a plane extending in the vertical direction. The inner diameter of the anchor hole 21 is larger than the outer diameter of the anchor bolt 3. A fixing material 22 is injected into the anchor hole 21, so that the anchor bolt 3 inserted into the anchor hole 21 is fixed by the fixing material 22.

[0035] Here, when the existing structural wall 2 is used as a reference in the fixing anchor installation method, the horizontal direction along the wall surface 2A is designated as the left-right direction X1, the direction perpendicular to the wall surface 2A is designated as the front-back direction X2, and the up-down direction is designated as X3.

[0036] First, a specific configuration of the positioning jig 10 used in the fixing anchor installation method will be described. As shown in FIGS. 1 and 2, the positioning jig 10 is fixed to the wall surface 2A and includes a positioning metal fitting 11 having a reference surface 11a, and a U-bolt 12 (pressing member) that can be fixed to the positioning metal fitting 11 from above.

[0037] 3 and 4, the positioning fitting 11 is an L-shaped steel with an L-shaped cross section. The positioning fitting 11 is integrally formed with a first wall 11A having a reference surface 11a and a second wall 11B having a contact surface 11b that is perpendicular to the first wall 11A and parallel to the wall surface 2A and capable of surface contact.

[0038] The positioning fitting 11 is attached to the wall surface 2A with the reference surface 11a of the first wall 11A facing horizontally. The first wall 11A has a pair of first long holes 13 penetrating in the thickness direction. The pair of first long holes 13 are arranged at a predetermined interval along the material axis direction with the long axis direction facing the material axis direction of the positioning fitting 11. The pair of first long holes 13 are fixing holes for fixing the U-bolt 12. That is, the male thread portion 12a of the U-bolt 12 can be inserted into each of the pair of first long holes 13. That is, when the positioning fitting 11 is fixed to the wall surface 2A, the U-bolt 12 inserted into the first long hole 13 can move laterally parallel to the wall surface 2A within the range of the first long hole 13.

[0039] The second wall 11B has a pair of second long holes 14 penetrating in the thickness direction. The pair of second long holes 14 are arranged at a predetermined interval along the material axis direction, with the long axis direction facing a direction perpendicular to the material axis direction in a plan view. The pair of second long holes 14 are bolt holes for detachably attaching the positioning fitting 11 to the wall surface 2A. In other words, the positioning fitting 11 can be moved in the up-down direction X3 within the range of the second long holes 14 relative to the bolt 16 that passes through the second long holes 14 and is fixed to the wall surface 2A.

[0040] 2, the U-bolt 12 is curved into a U-shape. The diameter of the curved inner periphery of the U-bolt 12 matches the outer diameter of the anchor bolt 3. Therefore, the U-bolt 12 can be in contact with the outer periphery of the upper half of the anchor bolt 3.

[0041] Male threads 12a are formed on both ends of the U-bolt 12. Nuts 15 are screwed onto the male threads 12a. When the U-bolt 12 is inserted from above into the first elongated hole 13 of the first wall 11A of the positioning fitting 11, the nuts 15 are screwed onto the male threads 12a protruding downward from the first wall 11A.

[0042] Specifically, when used as the positioning jig 10, the U-bolt 12 holds at least the upper half of the anchor bolt 3 and is supported by the positioning fitting 11 in a state in which the anchor bolt 3 is pressed from above. At this time, the U-bolt 12 is supported by the reference surface 11a of the first wall 11A so as to be movable in a lateral direction (long axis direction of the first long hole 13, left-right direction X1) perpendicular to the anchor axis direction (front-back direction X2) in the horizontal plane with the nut 15 loosened. Then, by tightening the nut 15, the U-bolt 12 is fixed to the first wall 11A in a state in which the lateral movement in the left-right direction X1 is restricted. When the U-bolt 12 is pressed against the reference surface 11a together with the anchor bolt 3, the tip portion 3c of the anchor bolt 3 is lifted and the anchor axis (center axis C) becomes horizontal (see FIG. 10). In addition, by further adjusting the horizontal direction with a level or the like, construction can be performed with higher accuracy.

[0043] Next, a description will be given of a specific configuration of the position adjustment means 40. The position adjustment means 40 is used to adjust the anchor axial direction of the anchor bolt to be aligned with the central axis of the anchor hole 21.

[0044] As shown in FIG. 5, the position adjustment means 40 includes a laser irradiation unit 41 that irradiates a laser L in a direction perpendicular to the wall surface 2A (front-back direction X2), and a guide rail 42 that guides the laser irradiation unit 41 movably in the left-right direction X1. The position adjustment means 40 can be moved to match the position of the anchor bolt 3 to be installed.

[0045] The laser irradiation unit 41 is installed on the guide rail 42 so that the irradiated laser L is positioned on an extension of a vertical reference mark M1 (see FIGS. 6 and 7) which will be described later.

[0046] The guide rail 42 extends horizontally in the left-right direction X1 at a position spaced apart from the wall surface 2A at the same height as the anchor hole 21. Both ends of the guide rail 42 are fixed by a pair of left and right support members 43. The support members 43 are fixed to a single pipe (not shown) fixed to the wall surface 2A and extending in the up-down direction X3, and extend from the single pipe in the front-back direction X2 in a direction away from the wall surface 2A. The guide rail 42 is supported by the protruding ends of the pair of support members 43. The pair of support members 43 are disposed outside the pair of anchor holes 21 in the left-right direction X1. Therefore, in this embodiment, the laser irradiation unit 41 is guided by the guide rail 42, and can be used to adjust the positions of both anchor bolts 3 installed in the pair of anchor holes 21.

[0047] Next, a construction procedure of the fixing anchor installation method for installing the anchor bolt 3 in the anchor hole 21 drilled in the existing structural wall 2 to be reinforced will be described in detail with reference to the drawings.

[0048] First, as shown in Fig. 5, an anchor axis line 3C extending in the anchor axial direction is marked in advance on the outer peripheral surface of the base end portion 3a on the base end side of the anchor bolt 3, which is the portion protruding from the anchor hole 21 (see Fig. 11). For example, the threaded portion of the base end portion 3a of the anchor bolt 3 is covered with masking tape, and the anchor axis line 3C is marked on the surface of the masking tape.

[0049] 6 and 7, a vertical reference mark M1 passing through the central axis O of the anchor hole 21 is marked at the hole opening of the wall surface 2A of the existing structural wall 2. Note that the symbol M3 shown in FIGS. 6 and 7 is a horizontal mark passing through the central axis O of the anchor hole 21.

[0050] Furthermore, at the hole opening of the wall surface 2A, a level reference mark M2 on a horizontal line passing through the lower end 3b of the anchor bolt 3 arranged coaxially with the anchor hole 21 is marked simultaneously with the vertical reference mark M1. This level reference mark M2 indicates the height position for positioning by aligning it with the reference surface 11a of the positioning metal fitting 11.

[0051] Next, as shown in Fig. 2, Fig. 7 and Fig. 8, the positioning jig 10 is attached to the wall surface 2A. Specifically, a positioning metal fitting 11 having a reference surface 11a is used, and the reference surface 11a is aligned with the level reference mark M2 marked on the wall surface 2A, and the positioning metal fitting 11 is detachably fixed to the wall surface 2A. The positioning metal fitting 11 is fixed by drilling a hole in a predetermined position on the wall surface 2A in advance, and fixing the bolt 16 passed through the second long hole 14 of the second wall 11B with the reference surface 11a aligned with the level reference mark M2. Since the second long hole 14 is used, the height and horizontality (inclination) of the positioning metal fitting 11 can be adjusted before the bolt 16 is completely fixed. Alternatively, a screw-in type post-installed anchor may be used as the bolt 16, and the bolt 16 may be removed after the installation of the fixed anchor, so that it is not left on the existing structure surface (wall surface 2A).

[0052] 8, a fixing material 22 is injected into the anchor hole 21. The fixing material 22 is an inorganic or organic injection material, for example, a cement-based material is used.

[0053] 9 and 10, the anchor bolt 3 is inserted into the anchor hole 21 into which the fixing material 22 has been injected to a predetermined fixing length, and the lower end 3b of the anchor bolt 3 is abutted against the reference surface 11a of the positioning metal fitting 11 (see Figs. 1 and 2). The anchor bolt 3 is inserted to a predetermined depth while being rotated relative to the anchor hole 21. At this time, the anchor axis line 3C (see Fig. 11) marked on the base end 3a of the anchor bolt 3 is used as a guide, and the anchor axis line 3C is made to face upward. The inserted anchor bolt 3 is then positioned with the base end 3a protruding from the wall surface 2A.

[0054] Next, as shown in FIG. 10, the base end 3a of the anchor bolt 3 is pressed from above against the reference surface 11a by the U-bolt 12, restricting the vertical movement of the anchor bolt 3. The U-bolt 12 holds at least the upper half of the anchor bolt 3, and while pressing the anchor bolt 3 from above, the anchor bolt 3 is fixed to the reference surface 11a of the positioning fitting 11 so as to be movable in the left-right direction X1 on the horizontal plane. In FIG. 10, the solid line indicates the state before the anchor bolt 3 is pressed by the U-bolt 12, and the two-dot chain line indicates the state after the U-bolt 12 presses the anchor bolt 3 against the reference surface 11a. The U-bolt 12 is fixed at this time by passing the male thread portion 12a of the U-bolt 12 through the first long hole 13 of the first wall 11A from above and tightening the nut 15, as shown in FIG. 2. This determines the position of the base end 3a of the anchor bolt 3 in the vertical direction X3.

[0055] Next, as shown in Fig. 5, a position adjustment means 40 is provided. Specifically, a pair of left and right support members 43 are fixed at predetermined positions on the wall surface 2A, and guide rails 42 are installed on the ends of the support members 43. Then, by attaching a laser irradiation unit 41 to the guide rails 42, the laser irradiation unit 41 is installed so as to irradiate the laser L in a direction perpendicular to the wall surface 2A (front-back direction X2). With the laser irradiation unit 41 installed in this manner, as shown in Fig. 11, by moving the laser irradiation unit 41 parallel and horizontally in the left-right direction X1 relative to the wall surface 2A, the laser L can be positioned on an extension line of a vertical reference mark M1 marked on the wall surface 2A.

[0056] Next, as shown in Fig. 11, after aligning the anchor axis direction (anchor axis line 3C) of the anchor bolt 3 with the laser line L0 (reference line) of the laser L when viewed from above, the U-bolt 12 is fully tightened with the nut 15 (see Fig. 2) and fixed to the positioning fitting 11 in a state where lateral movement of the U-bolt 12 in the left-right direction X1 is restricted. That is, as shown in Fig. 12, when the anchor bolt 3 is in a state where it has shifted left-right before aligning the anchor axis line 3C, the anchor bolt 3 is moved in the left-right direction X1 to be positioned so that the anchor axis line 3C is aligned with the laser line L0.

[0057] Thereafter, the position adjustment means 40 including the laser irradiation unit 41 and the guide rail 42 is removed from the predetermined position. Furthermore, after the fixing material 22 has hardened and been cured, the positioning jig 10 (the positioning metal fitting 11 and the U-bolt 12) is removed from the wall surface 2A, and the construction of the fixing anchor installation method is completed. The positioning jig 10 and the position adjustment means 40 used to install the anchor bolt 3 can be reused for the next anchor bolt 3 to be installed.

[0058] Next, the operation of the above-mentioned pre-injection type fixing anchor installation method and fixing anchor positioning structure will be described in detail with reference to the above-mentioned Figs. 1 to 12. The pre-injection type fixing anchor installation method according to this embodiment is a method of installing an anchor bolt 3 in an anchor hole 21 drilled in an existing structural wall 2 to be reinforced. The method for installing a fixed anchor includes the steps of: marking a vertical reference mark M1 passing through the central axis O of the anchor hole 21 on a wall surface 2A of an existing structural wall 2; using a positioning bracket 11 having a reference surface 11a, aligning the reference surface 11a with a horizontal line passing through the lower end of an anchor bolt 3 arranged coaxially with the anchor hole 21 to detachably fix the positioning bracket to the wall surface 2A; inserting the anchor bolt 3 into the anchor hole 21 and abutting the lower end 3b of the base end 3a of the anchor bolt 3 against the reference surface 11a; pressing the base end 3a of the anchor bolt 3 against the reference surface 11a from above with a U-bolt 12 to restrict up and down movement of the anchor bolt 3; positioning a reference line extending in a direction perpendicular to the wall surface 2A on an extension line of the vertical reference mark M1; and aligning the anchor axial direction of the anchor bolt 3 with the reference line when viewed from above, and then fixing the U-bolt 12 in a state in which lateral movement in the left-right direction X1 is restricted.

[0059] In the pre-injection type fixed anchor installation method according to this embodiment, the positioning and installation state of the anchor bolt 3 inserted into the anchor hole 21 can be determined in the up-down direction X3 and the left-right direction X1 using the positioning metal fitting 11 and the U-bolt 12. Furthermore, the central axes O and C of the anchor bolt 3 and the anchor hole 21 can be accurately aligned by a simple positioning operation of aligning the anchor axis direction with the vertical reference mark M1 marked on the wall surface 2A of the existing structural wall 2 and a reference line such as the laser line L0 of the laser L extending in a direction perpendicular to the wall surface 2A. Then, by fixing the positioned anchor bolt 3 to the positioning metal fitting 11 with the U-bolt 12, the base end portion 3a of the anchor bolt 3 can be supported at a predetermined height, so that the tip side of the anchor bolt 3 located at the back side of the anchor hole 21 can be held horizontally within the anchor hole 21. In this way, in this embodiment, the installation accuracy of the anchor bolt 3 can be ensured.

[0060] In addition, in the method for installing a pre-injection type fixed anchor according to the present embodiment, the position of the anchor bolt 3 in the vertical direction and the horizontal direction X1 can be adjusted using a jig consisting of a lightweight positioning metal fitting 11 having a reference surface 11a and a simple structure capable of fixing the U-bolt 12, and the U-bolt 12 only having the function of pressing the anchor bolt 3 from above. Furthermore, since the positioning jig 10 is for attaching the positioning metal fitting 11 in accordance with the position of the anchor hole 21, it can be diverted to install other anchor bolts 3. Therefore, it is not necessary to manufacture a positioning metal fitting 11 for each installation location of the anchor bolt 3, and the work efficiency for installing the positioning jig 10 can be improved, and the cost for manufacturing and installing the positioning jig 10 can be reduced. Moreover, since the positioning metal fitting 11 and the U-bolt 12 can be diverted, the cost for disposing of the members can be reduced.

[0061] Furthermore, in this embodiment, a pre-injection method can be adopted instead of the conventional post-injection method of the fixing material, and the anchor bolt 3 is inserted into the anchor hole 21 after the fixing material 22 is injected into the anchor hole 21. Therefore, there is no need to install the injection pipe, air vent pipe, and sealant used in the post-injection method, which improves work efficiency and shortens the construction period and reduces the costs of auxiliary materials. Furthermore, in this embodiment, the positioning jig 10 is composed of the positioning bracket 11 and the U-bolt 12, so it can be made a lightweight jig, making it easier to load and unload onto the scaffolding and to handle on the scaffolding, thereby reducing the effort and cost required for the work.

[0062] Furthermore, in this embodiment, the U-bolt 12 holds at least the upper half of the anchor bolt 3, and is provided so as to be able to support the positioning metal fitting 11 in a state in which the anchor bolt 3 is pressed from above. Therefore, a U-bolt 12 having a shape that follows the outer periphery of the anchor bolt 3 can be employed, and the anchor bolt 3 can be supported by being pressed against the reference surface 11a of the positioning metal fitting 11 with a simple structure.

[0063] Furthermore, in this embodiment, the U-bolt 12 is supported on the reference surface 11a so as to be movable laterally in a direction perpendicular to the anchor axis direction in the horizontal plane. Therefore, in this embodiment, since the U-bolt 12 is movable laterally relative to the reference surface 11a, the position of the anchor bolt 3 in the lateral direction (left-right direction X1) can be fine-tuned while the anchor bolt 3 is pressed against the reference surface 11a.

[0064] In this embodiment, the positioning metal fitting 11 has a contact surface 11b that is perpendicular to the reference surface 11a and parallel to the wall surface 2A and capable of surface contact, and the reference surface 11a and the contact surface 11b are integrally provided. Therefore, by abutting the abutment surface against the wall surface 2A of the existing structural wall 2, the positioning fitting 11 can be fixed to the wall surface 2A in a stably installed state, and the reference surface 11a can be prevented from shifting after the positioning fitting 11 is installed on the wall surface 2A, thereby improving the reliability of the installation accuracy of the anchor bolt 3.

[0065] In this embodiment, an anchor axis line 3C extending in the anchor axial direction is marked on the outer peripheral surface of the base end side of the anchor bolt 3, and when the U-bolt 12 is fixed in a state in which its lateral movement in the left-right direction X1 is restricted, the anchor axis line 3C is made to coincide with the reference line. Therefore, for example, by aligning the anchor axis line 3C marked on the anchor bolt 3 with a reference line such as the laser line L0 in this embodiment, the anchor axis C of the anchor bolt 3 can be easily aligned with the central axis O of the anchor hole 21 in the lateral direction.

[0066] In this embodiment, a level reference mark M2 is marked on the wall surface 2A of the existing structural wall 2, the level reference mark M2 being located on a horizontal line. Therefore, by aligning the reference surface 11a of the positioning fitting 11 with the level reference mark M2 marked on the wall surface 2A, the positioning fitting 11 can be easily attached to the wall surface 2A with the reference surface 11a positioned at the position of the lower end 3b of the anchor bolt 3 arranged coaxially with the anchor hole 21.

[0067] Furthermore, in this embodiment, a laser irradiation unit 41 is provided that irradiates a laser L, which is a reference line, in a direction perpendicular to the wall surface 2A, and by moving the laser irradiation unit parallel to the wall surface 2A, the laser L is positioned on an extension line of a vertical reference mark marked on the wall surface 2A. Therefore, by positioning the laser line of the laser L emitted from the laser irradiation unit on an extension of the vertical reference mark, it is possible to form the reference line that coincides with the central axis O of the anchor hole 21 when viewed from above. Therefore, by aligning the anchor axis direction with the laser line L0 that serves as the reference line, it is possible to easily position the anchor bolt 3 in the lateral direction (left-right direction X1).

[0068] In this embodiment, the anchor axis direction of the anchor bolt 3 is aligned with the laser line L0 of the laser L when viewed from above, and then the U-bolt 12 is fixed to the positioning metal fitting 11. As a result, the anchor bolt 3 can be firmly held in the final position by aligning the anchor axis direction with the laser line L0, which serves as the reference line, and then fixing it to the positioning fitting 11 with a U-bolt 12 so that the anchor bolt 3 does not move from the final positioned position.

[0069] In this embodiment, the fixing material 22 is injected into the anchor hole 21, and when the fixing material 22 has hardened, the positioning metal fitting 11 and the U-bolt 12 are removed from the wall surface 2A. Therefore, after the fixing material 22 has hardened, the positioning metal fitting 11 and the U-bolt 12 are removed from the wall surface 2A, and the anchor bolt 3 is released from its supported state, so that the anchor bolt 3 can be installed with high precision without shifting during hardening.

[0070] As described above, in the method for installing a pre-injection type fixed anchor according to the present embodiment, the accuracy of installing the anchor bolt is ensured, while the use of a lightweight and reusable jig makes it possible to improve the efficiency of installation work, reduce the costs of manufacturing and installation, and also suppress the cost of disposing of components.

[0071] The above describes an embodiment of the pre-injection type anchor installation method according to the present invention, but the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the present invention.

[0072] For example, the shape, size, mounting position on the wall surface 2A, and other configurations of the positioning jig 10 are not limited to those in the above-mentioned embodiment. In this embodiment, a positioning fitting 11 made of an L-shaped steel with an L-shaped cross section is used, but for example, a square steel pipe may also be used. Alternatively, the second wall may be omitted and only the positioning fitting for the first wall 11A may be provided, with only a portion on the first wall 11A that is mounted on the wall surface 2A. In short, it is sufficient that the positioning fitting has a planar reference surface 11a, and that the configuration allows the pressing member (U-bolt 12 in this embodiment) to be fixed to the positioning fitting together with the anchor bolt 3.

[0073] The pressing member is not limited to the U-bolt 12 as in this embodiment. It is sufficient if the base end 3a of the anchor bolt 3 can be fixed to the reference surface 11a while being restricted in the left-right direction X1 and the up-down direction X3. It does not have to be curved in a U-shape, and may be a member bent, for example, in a U-shape.

[0074] In addition, in this embodiment, the position adjustment means 40 is configured to include a laser irradiation unit 41, and the reference line is the laser line L0, but the present invention is not limited to this configuration. In short, it is sufficient to be able to form a reference line, so instead of the laser line L0, for example, a linear member such as a thread extending in a direction perpendicular to the wall surface 2A may be installed as the reference line, although this requires a little effort. In addition, the present invention is not limited to the method of providing such a reference line to restrict the vertical movement of the anchor bolt, and then positioning the reference line on an extension line of the vertical reference mark, and it is also possible to adopt a method of omitting the reference line.

[0075] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0076] 2 Existing frame wall 2A Wall 3 Anchor bolts 3a Proximal end 3b Bottom edge 3C Anchor axis line 10 Positioning jig 11 Positioning bracket 11a Reference plane 11b Contact surface 11A 1st wall 11B 2nd wall 12 U-bolt (holding member) 12a Male thread 13 1st long hole 14 2nd long hole 15 Nut 16 Volts 21 Anchor hole 22 Fixing agent 40 Position adjustment means 41 Laser irradiation unit 42 Guide rail C Anchor shaft O Anchor hole center axis M1 Vertical Reference Mark M2 Level Reference Mark (Horizontal Line) L Laser L0 Laser line (reference line) X1 Left / right direction X2 Anteroposterior direction X3 Vertical direction

Claims

1. A pre-injection type anchor installation method for installing an anchor bolt in an anchor hole drilled in an existing wall to be reinforced, comprising: A step of marking a vertical reference mark passing through the center of the anchor hole on a wall surface of the existing structural wall; a step of using a positioning metal fitting having a reference surface and removably fixing the positioning metal fitting to the wall surface by aligning the reference surface with a horizontal line passing through the lower end of the anchor bolt arranged coaxially with the anchor hole; a step of inserting the anchor bolt into the anchor hole and bringing a lower end of a base end of the anchor bolt into contact with the reference surface; a step of pressing the base end of the anchor bolt against the reference surface from above with a pressing member to restrict vertical movement of the anchor bolt; a step of aligning an anchor axis direction of the anchor bolt with an extension line of the vertical reference mark, and then fixing the pressing member in a state in which lateral movement of the pressing member is restricted; A method for installing a pre-injection anchor.

2. a step of providing a reference line extending in a direction perpendicular to the wall surface, restricting vertical movement of the anchor bolt, and then positioning the reference line on an extension line of the vertical reference mark; a step of aligning an anchor axis direction of the anchor bolt with the reference line when viewed from above, and then fixing the pressing member in a state in which lateral movement of the pressing member is restricted; 2. The method of claim 1, further comprising:

3. 2. The method for installing a pre-injection type fixed anchor according to claim 1, wherein the pressing member holds at least an upper half of the anchor bolt and is arranged to be supported by the positioning metal fitting in a state in which the anchor bolt is pressed from above.

4. The pre-injection type fixing anchor installation method according to claim 3 , wherein the pressing member is supported on the reference surface so as to be movable in a lateral direction perpendicular to the anchor axial direction in a horizontal plane.

5. The pre-injection type fixing anchor installation method according to claim 1, wherein the positioning fitting has an abutment surface that is perpendicular to the reference surface and parallel to the wall surface and capable of surface contact, and the reference surface and the abutment surface are integrally formed.

6. An anchor axis line extending in the anchor axial direction is marked on an outer peripheral surface of a base end side of the anchor bolt, 3. The method for installing a pre-injection type fixed anchor according to claim 2, wherein the anchor axis line is made to coincide with the reference line when fixing the pressing member in a state in which lateral movement of the pressing member is restricted.

7. The method for installing a fixing anchor according to claim 1 , further comprising the step of marking the wall surface of the existing structural wall with a level reference mark located on the horizontal line.

8. a laser irradiation unit that irradiates a laser beam that is the reference line in a direction perpendicular to the wall surface; 3. The pre-injection type fixed anchor installation method according to claim 2, wherein the laser irradiation unit is moved parallel to the wall surface to position the laser on an extension line of the vertical reference mark marked on the wall surface.

9. 9. The method for installing a pre-injection type fixed anchor according to claim 8, further comprising the steps of: aligning the anchor axial direction of the anchor bolt with a laser line of the laser when viewed from above; and then fixing the pressing member to the positioning metal fitting.

10. Injecting a fixing material into the anchor hole; The pre-injection type fixing anchor installation method according to claim 1 , wherein the positioning metal fitting and the pressing member are removed from the wall surface after the fixing material has hardened.

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