Pre-injection type 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 method for installing a fixing anchor of a prior injection type.

Background Art

[0002] Conventionally, in bridge reinforcement work, due to the small anchor bolt hole diameter of the steel brackets to be installed and the thick plate thickness of the base plate, high installation accuracy is required for the level and core position of the anchor bolts installed in advance. Therefore, the construction difficulty is high and the construction is time-consuming. And, as a conventional method for installing a fixing anchor, after inserting an anchor bolt into an anchor hole, an injection pipe and an air vent pipe communicating with the inside of the anchor hole are installed at the hole opening portion with a sealing material and the hole opening portion is closed. A post-injection method of injecting a fixing material such as an epoxy resin into the anchor hole using the injection pipe is known (see, for example, Patent Document 1).

[0003] Also, as another installation method, as a method for improving the installation accuracy of anchor bolts, the installation accuracy is improved by installing the anchor bolts using a template in which a crossbar is integrally attached to a common plywood. Incidentally, holes are provided in advance at the same positions as the drilled hole positions in the template.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional anchor bolt installation method using the aforementioned injection pipe, air vent pipe, and sealant, the two types of pipe materials inserted beforehand are positioned in the gap between the anchor hole and the anchor bolt. As a result, when aligning the anchor bolt, the pre-inserted pipe materials become an obstacle to alignment, and are a major cause of misalignment of the hole center position in the anchor bolt. Therefore, especially in bridge reinforcement work where high installation accuracy of anchor bolts is required, the post-injection method currently makes it difficult to guarantee high installation accuracy during construction.

[0006] Furthermore, when using a template to install anchor bolts, the template is manufactured to match the position of the drilled anchor hole in order to improve the accuracy of the anchor installation. As a result, a new template needs to be manufactured for each anchor bolt installation location, which increases material costs and labor costs. Moreover, if the dimensions of the steel bracket attached to the anchor bolt installation surface (wall) are large, the weight of the template itself also increases, making it difficult and laborious to lift, unload, and handle on scaffolding, so there was room for improvement in this respect as well. Furthermore, in this case, the anchor bolts cannot be reused at each installation location, and a template must be created for each use, which increases the amount of industrial waste generated.

[0007] This invention has been made in view of the above-mentioned problems, and aims to provide a pre-injection type anchor installation method that can improve work efficiency in installation by using a lightweight and reusable jig while ensuring the accuracy of anchor bolt installation, and further reduce the costs of manufacturing and installation, as well as the costs of disposing of materials. [Means for solving the problem]

[0008] To achieve the above objective, Embodiment 1 of the pre-injection type anchor installation method according to the present invention is an anchor installation method for installing an anchor bolt in an anchor hole drilled in an existing structural wall to be reinforced, characterized by comprising the steps of: marking a vertical reference mark passing through the center of the anchor hole on the wall surface of the existing structural wall; using a positioning fitting having a reference surface, aligning the reference surface with a horizontal line passing through the lower end of the anchor bolt which is arranged coaxially with the anchor hole, and detachably fixing the positioning fitting to the wall surface; inserting the anchor bolt into the anchor hole and bringing the lower end of the base end of the anchor bolt into contact with the reference surface; pressing the base end of the anchor bolt from above against the reference surface with a pressing member to restrict the vertical movement of the anchor bolt; and aligning the anchor axis direction of the anchor bolt with the extension line of the vertical reference mark, and then fixing it in a state where the lateral movement of the pressing member is restricted.

[0009] In the pre-injection 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 fitting and a retaining member. Furthermore, by a simple positioning operation of aligning the anchor axis with a vertical reference mark marked on the wall surface of the existing structural wall, the central axes of the anchor bolt and the anchor hole can be precisely aligned. Then, by fixing the positioned anchor bolt to the positioning fitting with the retaining member, the base end of the anchor bolt can be supported at a predetermined height, so that the tip of the anchor bolt located at the back 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] Furthermore, in the pre-injection type anchor installation method according to the present invention, the vertical and horizontal position of the anchor bolt can be adjusted using a jig consisting of a lightweight positioning fitting with a simple structure that has a reference surface and can fix a pressing member, and a pressing member that only has the function of pressing the anchor bolt from above. Moreover, since the jig is attached to match the position of the anchor hole, it can be reused for the installation of other anchor bolts. Therefore, there is no need to manufacture a positioning fitting for each anchor bolt installation location, improving the work efficiency of jig installation and further reducing the costs associated with manufacturing and installing the jig. In addition, since the positioning fitting and pressing member are reusable, the costs associated with disposing of the parts can also be reduced.

[0011] Furthermore, this invention employs a pre-injection method instead of the conventional post-injection method for anchoring material. Instead, the anchoring material is injected into the anchor hole before the anchor bolt is inserted. Therefore, the installation of injection pipes, air vent pipes, and sealing materials used in the post-injection method is unnecessary, improving work efficiency, shortening the construction period, and reducing the cost of auxiliary materials. Furthermore, since the present invention is a jig consisting of a positioning fitting and a pressing member, it can be made into a lightweight jig, making it easier to lift and lower materials onto scaffolding and to handle them on scaffolding, thereby reducing the effort and cost involved in the work.

[0012] Furthermore, in the pre-injection type anchor installation method of the present invention, it is preferable that the method includes the steps of: providing a reference line extending in a direction perpendicular to the wall surface, restricting the vertical movement of the anchor bolt, and then positioning the reference line on the extension of the vertical reference mark; and aligning the anchor axis direction of the anchor bolt with the reference line when viewed from above, and then fixing the retaining member in a state where its lateral movement 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: aligning the anchor axis with a vertical reference mark marked on the wall surface of the existing structural wall and a reference line, such as a laser line, that extends perpendicular to the wall surface.

[0014] Furthermore, in the third aspect of the present invention, in the pre-injection type anchor installation method of the first aspect, it is preferable that the pressing member is provided so as to be able to support the positioning fitting while holding at least the upper half of the anchor bolt and pressing down on the anchor bolt from above.

[0015] In this case, for example, a retaining member shaped to follow the outer circumference of the anchor bolt, such as a U-bolt, can be used, and the anchor bolt can be pressed against and supported against the reference surface of the positioning fitting with a simple structure.

[0016] Furthermore, in the fourth aspect of the present invention, in the pre-injection type 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 axis direction in the horizontal plane.

[0017] In this case, since the retaining member can move laterally with respect to the reference plane, the lateral position of the anchor bolt can be finely adjusted while the anchor bolt remains pressed against the reference plane.

[0018] Furthermore, in embodiment 5 of the present invention, in the pre-injection type anchoring anchoring method of embodiment 1, the positioning fitting has a contact 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 contact surface are provided integrally.

[0019] In this case, by bringing the contact surface into contact with the existing structural wall, the positioning bracket can be fixed to the wall in a stable position, preventing the reference surface from shifting after the positioning bracket is installed on the wall, and increasing the reliability of the anchor bolt installation accuracy.

[0020] Moreover, in the method for installing a pre-injected fixing anchor according to Embodiment 2 of the present invention, it is preferable that an anchor axis line extending in the anchor axis direction is marked on the outer peripheral surface of the base end side of the anchor bolt, and when fixing in a state where the lateral movement of the pressing member is restricted, the anchor axis line is aligned with the reference line.

[0021] In this case, for example, by aligning the anchor axis line marked on the anchor bolt with the 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] Moreover, in the method for installing a pre-injected fixing anchor according to Embodiment 1 of the present invention, it is preferable that a level reference mark located on the horizontal line is marked on the wall surface of the existing housing wall.

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

[0024] Moreover, in the method for installing a pre-injected fixing anchor according to Embodiment 2 of the present invention, a laser irradiation unit that irradiates a laser, which is the reference line, in a direction perpendicular to the wall surface is provided, and by moving the laser irradiation unit parallel to the wall surface, it is preferable that the laser is positioned on the extension line of the vertical reference mark marked on the wall surface.

[0025] In this case, by positioning the laser line of the laser irradiated from the laser irradiation unit on the extension line of the vertical reference mark, a reference line that coincides with the central axis of the anchor hole when viewed from above the laser line can be formed. Therefore, by aligning the anchor axis direction with the laser line serving as the reference line, the lateral positioning of the anchor bolt can be easily performed.

[0026] Moreover, in the method for installing a fixing anchor by prior injection according to Embodiment 8 of the present invention, after aligning the anchor axis direction of the anchor bolt with the laser line of the laser as viewed from above, it is preferable to fix the pressing member to the positioning fitting.

[0027] In this case, after aligning the anchor axis direction with the laser line serving as the reference line to perform lateral positioning of the anchor bolt, and then fixing it to the positioning fitting with the pressing member, the anchor bolt can be firmly held so as not to move at the finally positioned position.

[0028] Moreover, in the method for installing a fixing anchor by prior injection according to Embodiment 10 of the present invention, 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 in a state where the fixing material is cured.

[0029] In this case, after the fixing material is cured, the positioning fitting and the pressing member are removed from the wall surface to release the support state of the anchor bolt, so that the anchor bolt can be accurately installed without being displaced during curing.

Advantages of the Invention

[0030] According to the method for installing a fixing anchor by prior injection of the present invention, while ensuring the installation accuracy of the anchor bolt, by using a lightweight and transferable jig, it is possible to improve the working efficiency of installation. Furthermore, according to the method for installing a fixing anchor by prior injection of the present invention, the cost for manufacturing and installing the jig can be reduced, and the cost for discarding members can also be suppressed.

Brief Description of the Drawings

[0031] [Figure 1] It is a cross-sectional view showing the configuration of the method for installing an anchor bolt according to an embodiment of the present invention. [Figure 2] It is a front view of the anchor bolt shown in FIG. 1 as viewed from the side facing the wall surface. [Figure 3] This is a front view of the positioning bracket. [Figure 4] This is a plan view of the positioning bracket, seen from above. [Figure 5] This is a plan view from above showing the positioning jig and positioning adjustment means mounted on a wall. [Figure 6] This is a front view showing a wall surface with vertical reference marks and level reference marks marked at the opening of anchor holes. [Figure 7] Figure 6 is a perspective view showing the positioning bracket attached to the wall surface. [Figure 8] This is a cross-sectional view showing the anchor hole after the fixing material has been injected. [Figure 9] This is a cross-sectional view showing the process of inserting an anchor bolt into an anchor hole. [Figure 10] This is a cross-sectional view showing the state in which an anchor bolt has been inserted into the anchor hole and the U-bolt is supported by the positioning bracket. [Figure 11] This is a perspective view showing the anchor axis mark of the anchor bolt aligned with the laser line emitted from the laser irradiation unit and the vertical reference mark. [Figure 12] Figure 11 is a perspective view showing the state where the anchor bolts are misaligned in the left-right direction before the anchor axis marks are aligned. [Modes for carrying out the invention]

[0032] The following describes a pre-injection type anchor installation method according to an embodiment of the present invention, based on the drawings.

[0033] As shown in Figures 1 and 2, the anchor installation method of this embodiment is a pre-injection type method in which anchor bolts 3 are installed in anchor holes 21 drilled in the existing structural wall 2 to be reinforced. In the anchor installation method, anchoring material 22 is injected into the anchor hole 21, and before the anchoring material 22 hardens, the anchor bolts 3 are inserted into the anchor hole 21, and the position of the anchor bolts 3 is adjusted using a positioning jig 10 and position adjustment means 40 (see Figure 5). Here, the 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. The wall surface 2A of the existing structural wall 2, where the anchor bolts 3 are installed, is formed in a plane that extends vertically. The inner diameter of the anchor hole 21 is larger than the outer diameter of the anchor bolt 3. Since the anchoring material 22 is injected into the anchor hole 21, the anchor bolt 3 inserted into the anchor hole 21 is fixed by the anchoring material 22.

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

[0036] First, we will explain the specific configuration of the positioning jig 10 used in the anchor installation method. As shown in Figures 1 and 2, the positioning jig 10 comprises a positioning fitting 11 fixed to the wall surface 2A and having a reference surface 11a, and a U-bolt 12 (pressure member) that can be fixed to the positioning fitting 11 from above.

[0037] As shown in Figures 3 and 4, the positioning fitting 11 is an L-shaped steel beam with an L-shaped cross-section. The positioning fitting 11 is integrally provided 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 bracket 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 elongated holes 13 that penetrate in the thickness direction. The pair of first elongated holes 13 are arranged at a predetermined interval along the material axis direction with their long axis direction facing the material axis direction of the positioning bracket 11. The pair of first elongated holes 13 are fixing holes for fixing U-bolts 12. That is, the male threaded portion 12a of the U-bolt 12 can be inserted through each of the pair of first elongated holes 13. In other words, when the positioning bracket 11 is fixed to the wall surface 2A, the U-bolt 12 inserted through the first elongated holes 13 can move laterally parallel to the wall surface 2A within the range of the first elongated holes 13.

[0039] The second wall 11B has a pair of second elongated holes 14 that penetrate in the thickness direction. The pair of second elongated holes 14 are arranged at a predetermined interval along the material axis, with their longitudinal axis oriented perpendicular to the material axis when viewed from above. The pair of second elongated holes 14 are bolt holes for detachably attaching the positioning fitting 11 to the wall surface 2A. That is, with respect to the bolts 16 that are fixed to the wall surface 2A by passing through the second elongated holes 14, the positioning fitting 11 can be moved vertically X3 within the range of the second elongated holes 14.

[0040] As shown in Figure 2, the U-bolt 12 is curved in a U-shape. The diameter of the curved inner circumference of the U-bolt 12 matches the outer diameter of the anchor bolt 3. Therefore, the U-bolt 12 can make contact with the outer circumference of the upper half of the anchor bolt 3.

[0041] Male threaded portions 12a are formed at both ends of the U-bolt 12. Nuts 15 are screwed onto the male threaded portions 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 threaded portions 12a that protrude downward from the first wall 11A.

[0042] Specifically, when used as a 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 while pressing down on the anchor bolt 3 from above. At this time, with the nut 15 loosened, the U-bolt 12 is supported on the reference surface 11a of the first wall 11A so as to be movable in the lateral direction (the long axis direction of the first elongated hole 13, left-right direction X1) perpendicular to the anchor axis direction (front-back direction X2) in the horizontal plane. Then, by tightening the nut 15, the U-bolt 12 is fixed to the first wall 11A while restricting lateral movement in the left-right direction X1. When the U-bolt 12 is pressed against the reference surface 11a together with the anchor bolt 3, the tip 3c of the anchor bolt 3 is lifted, and the anchor axis (central axis C) becomes horizontal (see Figure 10). Furthermore, by making horizontal adjustments with a spirit level or the like, construction can be carried out with even higher precision.

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

[0044] As shown in Figure 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-to-back direction X2), and a guide rail 42 that guides the laser irradiation unit 41 so that it can move in the left-to-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 such that the irradiated laser L is positioned on the extension of the vertical reference mark M1 (see Figures 6 and 7), which will be described later.

[0046] The guide rail 42 extends horizontally in the left-right direction X1 at a distance from the wall surface 2A, at the same height as the anchor holes 21. Both ends of the guide rail 42 are fixed by a pair of support members 43. The support members 43 are fixed to a single pipe (not shown) that is fixed to the wall surface 2A and extends in the vertical direction X3, and extend from the single pipe away from the wall surface 2A in the front-rear direction X2. The guide rail 42 is supported by the protruding ends of the pair of support members 43. The pair of support members 43 are positioned 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 position of both anchor bolts 3 installed in the pair of anchor holes 21.

[0047] Next, the construction procedure for installing anchor bolts 3 in anchor holes 21 drilled in the existing structural wall 2 to be reinforced will be explained in detail with reference to the drawings.

[0048] First, as shown in Figure 5, the anchor axis line 3C extending in the direction of the anchor axis is marked in advance on the outer circumferential surface of the base end 3a of the anchor bolt 3, which will protrude from the anchor hole 21 (see Figure 11). For example, the threaded portion of the base end 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] Then, as shown in Figures 6 and 7, a vertical reference mark M1 passing through the central axis O of the anchor hole 21 is marked at the opening of the hole in the wall surface 2A of the existing structural wall 2. Note that the symbol M3 shown in Figures 6 and 7 is a horizontal mark passing through the central axis O of the anchor hole 21.

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

[0051] Next, as shown in Figures 2, 7, and 8, the positioning jig 10 is attached to the wall surface 2A. Specifically, a positioning 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 fitting 11 is detachably fixed to the wall surface 2A. The positioning fitting 11 is fixed by pre-drilling holes in predetermined positions on the wall surface 2A, aligning the reference surface 11a with the level reference mark M2, and then fixing it with a bolt 16 that passes through the second elongated hole 14 of the second wall 11B. Since it is a second elongated hole 14, the height and horizontality (tilt) of the positioning 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 anchoring is installed, so that it is not left in the existing structural surface (wall surface 2A).

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

[0053] Subsequently, as shown in Figures 9 and 10, the anchor bolt 3 is inserted into the anchor hole 21 into which the anchoring material 22 has been injected to a predetermined anchoring length, and the lower end 3b of the anchor bolt 3 is brought into contact with the reference surface 11a of the positioning fitting 11 (see Figures 1 and 2). The anchor bolt 3 is inserted into the anchor hole 21 to a predetermined depth while rotating it. At this time, the anchor axis line 3C (see Figure 11) marked on the base end 3a of the anchor bolt 3 is used as a guide, and the anchor axis line 3C is positioned so that it is facing upwards. The inserted anchor bolt 3 is then positioned so that its base end 3a protrudes from the wall surface 2A.

[0054] Next, as shown in Figure 10, the base end 3a of the anchor bolt 3 is pressed against the reference surface 11a from above by a 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, is fixed to the reference surface 11a of the positioning fitting 11 so as to be movable in the left-right direction X1 in the horizontal plane. In Figure 10, the solid line shows the state before the anchor bolt 3 is pressed by the U-bolt 12, and the dashed line shows the state after the anchor bolt 3 is pressed against the reference surface 11a by the U-bolt 12. The U-bolt 12 is fixed at this time by passing the male threaded portion 12a of the U-bolt 12 through the first elongated hole 13 of the first wall 11A from above and tightening the nut 15, as shown in Figure 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 Figure 5, a position adjustment means 40 is provided. Specifically, a pair of left and right support members 43 are fixed to predetermined positions on the wall surface 2A, and guide rails 42 are installed at the ends of these support members 43. Then, by attaching the 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 way, as shown in Figure 11, by moving it parallel and horizontally in the left-right direction X1 with respect to the wall surface 2A, the laser L can be positioned on the extension of the vertical reference mark M1 marked on the wall surface 2A.

[0056] Next, as shown in Figure 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 completely tightened with the nut 15 (see Figure 2) to restrict the lateral movement of the U-bolt 12 in the left-right direction X1 and then fixed to the positioning bracket 11. That is, as shown in Figure 12, if the anchor bolt 3 is misaligned in the left-right direction before aligning the anchor axis line 3C, the anchor bolt 3 is moved in the left-right direction X1 to position it so that the anchor axis line 3C aligns with the laser line L0.

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

[0058] Next, the operation of the pre-injection type anchoring anchor installation method and anchoring anchor positioning structure described above will be explained in detail based on Figures 1 to 12 above. The pre-injection type anchor installation method according to this embodiment involves installing anchor bolts 3 into anchor holes 21 drilled in the existing structural wall 2 to be reinforced. The anchor installation method includes the steps of: marking a vertical reference mark M1 passing through the central axis O of the anchor hole 21 on the wall surface 2A of the existing structural wall 2; using a positioning fitting 11 having a reference surface 11a, aligning the reference surface 11a with a horizontal line passing through the lower end of the anchor bolt 3 which is arranged coaxially with the anchor hole 21, and fixing the positioning fitting to the wall surface 2A in a detachable manner; inserting the anchor bolt 3 into the anchor hole 21 and bringing the lower end 3b of the base end 3a of the anchor bolt 3 into contact with 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 the vertical movement of the anchor bolt 3; positioning a reference line extending in a direction perpendicular to the wall surface 2A on the extension of the vertical reference mark M1; and fixing the anchor bolt 3 with the anchor axis direction aligned with the reference line when viewed from above, while restricting the lateral movement X1 of the U-bolt 12.

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

[0060] Furthermore, in the pre-injection type anchor installation method according to this embodiment, the position of the anchor bolt 3 in the vertical and horizontal directions X1 can be adjusted using a jig consisting of a lightweight positioning fitting 11 with a simple structure that has a reference surface 11a and can fix the U-bolt 12, and a U-bolt 12 that only has the function of pressing down on the anchor bolt 3 from above. Moreover, since the positioning jig 10 is installed by aligning the positioning fitting 11 with the position of the anchor hole 21, it can be reused for the installation of other anchor bolts 3. Therefore, there is no need to manufacture a positioning fitting 11 for each anchor bolt 3 installation location, improving the work efficiency of installing the positioning jig 10, and further reducing the cost of manufacturing and installing the positioning jig 10. In addition, since the positioning fitting 11 and U-bolt 12 are reusable, the cost of disposing of the materials can also be reduced.

[0061] Furthermore, in this embodiment, a pre-injection method is adopted instead of the conventional post-injection method for the anchoring material. Instead, the anchoring material 22 is injected into the anchor hole 21, and then the anchor bolt 3 is inserted into the anchor hole 21. Therefore, the installation of injection pipes, air vent pipes, and sealing materials used in the post-injection method is unnecessary, improving work efficiency, shortening the construction period, and reducing the cost of auxiliary materials. Furthermore, in this embodiment, since the positioning jig 10 consists of a positioning fitting 11 and a U-bolt 12, it can be made into a lightweight jig, making it easier to lift and lower loads onto the scaffolding and to handle them on the scaffolding, thereby reducing the effort and cost of the work.

[0062] Furthermore, in this embodiment, the U-bolt 12 is provided so as to be able to hold at least the upper half of the anchor bolt 3 and support the anchor bolt 3 on the positioning fitting 11 while pressing it down from above. Therefore, a U-bolt 12 with a shape that follows the outer circumference of the anchor bolt 3 can be used, and the anchor bolt 3 can be pressed down and supported against the reference surface 11a of the positioning fitting 11 with a simple structure.

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

[0064] Furthermore, in this embodiment, the positioning 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 provided integrally. Therefore, by bringing the contact surface into contact with the wall surface 2A of the existing structural wall 2, the positioning bracket 11 can be fixed to the wall surface 2A in a stable installation state, preventing the reference surface 11a from shifting after the positioning bracket 11 is installed on the wall surface 2A, and thereby increasing the reliability of the installation accuracy of the anchor bolt 3.

[0065] Furthermore, in this embodiment, an anchor axis line 3C extending in the direction of the anchor axis is marked on the outer circumferential surface of the base end of the anchor bolt 3, and when fixing the U-bolt 12 while restricting its lateral movement in the left-right direction X1, the anchor axis line 3C is aligned with the reference line. Therefore, 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, for example, 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 addition, in this embodiment, a level reference mark M2 located on a horizontal line is marked on the wall surface 2A of the existing structural wall 2. Therefore, by aligning the reference surface 11a of the positioning bracket 11 with the level reference mark M2 marked on the wall surface 2A, the positioning bracket 11 can be easily attached to the wall surface 2A with the reference surface 11a positioned at the lower end 3b of the anchor bolt 3, which is arranged coaxially with the anchor hole 21.

[0067] Furthermore, in this embodiment, a laser irradiation unit 41 is provided that irradiates a reference line laser L 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 the extension of the 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 the extension of the vertical reference mark, the reference line can be formed such that the laser line L0 coincides with the central axis O of the anchor hole 21 when viewed from above. As a result, by aligning the anchor axis direction with the reference line laser line L0, the lateral positioning (left-right direction X1) of the anchor bolt 3 can be easily performed.

[0068] In this embodiment, 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 fitting 11. This allows the anchor bolt 3 to be firmly held in its final position by aligning its axis with the reference laser line L0, positioning it laterally, and then fixing it to the positioning bracket 11 with the U-bolt 12.

[0069] In this embodiment, the anchoring material 22 is injected into the anchor hole 21, and the positioning bracket 11 and U-bolt 12 are removed from the wall surface 2A once the anchoring material 22 has hardened. Therefore, after the anchoring material 22 has hardened, the positioning bracket 11 and U-bolt 12 are removed from the wall surface 2A, releasing the support of the anchor bolt 3. This allows the anchor bolt 3 to be installed accurately without shifting during the hardening process.

[0070] As described above, the pre-injection type anchor installation method according to this embodiment ensures the accuracy of anchor bolt installation while using a lightweight and reusable jig, thereby improving the work efficiency of the installation process, reducing manufacturing and installation costs, and also reducing the costs associated with disposing of materials.

[0071] Although embodiments of the pre-injection type anchor installation method according to the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit of the invention.

[0072] For example, the shape, size, and mounting position of the positioning jig 10 on the wall surface 2A are not limited to the embodiments described above. In this embodiment, a positioning fitting 11 made of L-shaped steel with an L-shaped cross-section is used, but a square steel pipe may be used, for example. Alternatively, the second wall may be omitted, and the positioning fitting may consist only of the first wall 11A, with only the portion for attachment to the wall surface 2A provided on the first wall 11A. In short, any positioning fitting having a planar reference surface 11a is sufficient, as long as it can be configured to fix a retaining member (U-bolt 12 in this embodiment) together with the anchor bolt 3 to the positioning fitting.

[0073] Furthermore, the retaining member is not limited to a U-bolt 12 as in this embodiment. Any configuration that can fix the base end 3a of the anchor bolt 3 to the reference surface 11a while restricting it in the left-right direction X1 and the up-down direction X3 is acceptable. It does not need to be curved in a U shape; for example, it may be a member bent in a U-shape.

[0074] Furthermore, 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 configuration is not limited to this. In short, it is sufficient to be able to form a reference line, so instead of the above laser line L0, for example, a linear member such as a thread extending in a direction perpendicular to the wall surface 2A may be set as the reference line, although this requires a little more effort. Also, the method is not limited to setting such a reference line to restrict the vertical movement of the anchor bolts and then positioning the reference line on the extension of the vertical reference mark, and it is also possible to adopt a method that omits the reference line.

[0075] Furthermore, it is possible to replace the components in the above-described embodiments 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 hardware 11a Reference plane 11b Contact surface 11A 1st wall 11B 2nd wall 12 U-bolt (retaining member) 12a Male threaded section 13 1st long hole 14 2nd long hole 15 nuts 16 volts 21 Anchor holes 22 Fixing agent 40 Position adjustment means 41 Laser irradiation area 42 Guide rails C Anchor axis O Central axis of the anchor hole 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 in which anchor bolts are installed in anchor holes drilled into an existing structural wall to be reinforced, The process involves marking a vertical reference mark passing through the center of the anchor hole on the wall surface of the existing structural wall, A step of using a positioning fitting having a reference surface, aligning the reference surface with a horizontal line passing through the lower end of the anchor bolt which is arranged coaxially with the anchor hole, and detachably fixing the positioning fitting to the wall surface, The steps include inserting the anchor bolt into the anchor hole and bringing the lower end of the base 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 retaining member, thereby restricting the vertical movement of the anchor bolt. The process involves aligning the anchor axis direction of the anchor bolt with the extension line of the vertical reference mark, and then fixing the retaining member in a state where its lateral movement is restricted. A pre-injection type anchor installation method having

2. A step of setting a reference line extending in a direction perpendicular to the wall surface, restricting the vertical movement of the anchor bolts, and then positioning the reference line on the extension of the vertical reference mark, The process involves aligning the anchor axis direction of the anchor bolt with the reference line when viewed from above, and then fixing the retaining member in a state where its lateral movement is restricted. A pre-injection type anchor installation method according to claim 1, comprising the features described above.

3. The pre-injection type anchor installation method according to claim 1, wherein the pressing member is provided so as to be able to support the anchor bolt on the positioning fitting while holding at least the upper half of the anchor bolt and pressing down on the anchor bolt from above.

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

5. The pre-injection type anchoring anchoring method according to claim 1, wherein the positioning fitting has a contact 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 contact surface are provided integrally.

6. An anchor axis line extending in the direction of the anchor axis is marked on the outer circumferential surface of the base end of the anchor bolt. The pre-injection type anchor installation method according to claim 2, wherein when fixing the retaining member in a state where its lateral movement is restricted, the anchor axis line is aligned with the reference line.

7. The method for installing a fixing anchor according to claim 1, wherein a level reference mark located on the horizontal line is marked on the wall surface of the existing structural wall.

8. A laser irradiation unit is provided that irradiates the reference line laser in a direction perpendicular to the wall surface. The pre-injection type anchoring anchoring method according to claim 2, wherein the laser irradiation unit is moved parallel to the wall surface to position the laser on the extension of the vertical reference mark marked on the wall surface.

9. The pre-injection type anchor installation method according to claim 8, wherein the anchor axial direction of the anchor bolt is aligned with the laser line of the laser when viewed from above, and then the retaining member is fixed to the positioning fitting.

10. A fixing material is injected into the aforementioned anchor hole. The pre-injection type anchoring anchoring anchoring method according to claim 1, wherein the positioning fitting and the retaining member are removed from the wall surface when the anchoring material has hardened.

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