Anchor material

Abstract

To provide an anchor member capable of supporting a lattice member so as not to escape in a direction parallel to concrete surface when fixing a lattice member on a concrete face and capable of functioning as a leveler leveling thickness in constructing a thickening material.SOLUTION: An anchor member 1 for temporarily fixing a lattice member 30 reinforcing a concrete face of a concrete structure has a through hole 11 through which an anchor body 21 is inserted and fixed from a surface side into which the anchor body 21 is inserted toward a rear face side pressed against the concrete face. In the rear face side of an area except the through hole 11, a recessed groove portion 12 with which a crossing portion of the lattice member 30 engages is formed. The anchor member 1 has a thickness according to a design thickness of a reinforcement layer formed by embedding the lattice member 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anchor member that temporarily fixes a lattice material for reinforcing a concrete structure to the concrete structure, and in particular to an anchor member that makes it easy to manage the thickness of a reinforcing thickening material and enables efficient fixing of the lattice material. [Background technology]

[0002] As a technique for reinforcing concrete structures using lattice materials, for example, the technique shown in Patent Document 1 is disclosed. The technique shown in Patent Document 1 is a method for performing a surface treatment on FRP lattice materials to strengthen their adhesion to the surrounding concrete or mortar, in which (1) either one of the following primers is applied to the surface of the FRP lattice material: (a) a primer containing a thermosetting resin as the main component and a hardener mixed therein, (b) a primer containing an unsaturated polyester resin or vinyl ester resin as the main component and a specific hardener mixed therein by introducing a hydrophilic group, or (c) a primer which is a polymer emulsion, or (2) an adhesive resin is applied to the surface of the FRP lattice material, and an adhesive reinforcement material composed of a granular or fibrous material is attached thereon. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-71377 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the reinforcement of concrete structures as described above, in order to maintain the quality of construction, it is necessary to manage the thickness of the thickening material so that it is finished uniformly and smoothly. In particular, for example, in a waterway structure for hydroelectric power generation, if the cross-sectional area of ​​the waterway becomes small, the water flow is obstructed and the water becomes difficult to flow, and if the waterway is not finished smoothly, the water does not flow smoothly due to the roughness coefficient, and the two factors combine to reduce the power generation output. However, with the technology shown in Patent Document 1, the task of finishing the thickening material to a uniform thickness is highly difficult, and there is a problem that the accuracy varies depending on the skill level of the worker.

[0005] In addition, inspection is required to ensure that the lining thickness is as designed, and this inspection requires a lot of time and effort.

[0006] Furthermore, a method of fixing FRP lattice materials to a concrete surface with an anchor body has been disclosed, in which an anchor body is driven into the concrete at one of the four corners of the lattice, and the intersection of the FRP lattice materials is fixed with a washer. However, as shown in FIG. 8, when the anchor body is driven, the FRP lattice material slides in a direction parallel to the concrete surface due to the pressing force of the washer, and the FRP lattice material in the direction of escape floats. In particular, at the joints between FRP lattice materials, the FRP lattice materials overlap and increase in thickness, making them more likely to slide and escape. In order to prevent such problems, it is necessary for a worker other than the worker who drives the anchor body to support the FRP lattice material so that it does not shift when the anchor body is driven. In other words, there is a problem that the work of driving the anchor body requires a lot of effort and time.

[0007] The present invention has been made to solve the above-mentioned problems, and provides an anchor member that can support a lattice material to prevent it from sliding laterally parallel to the concrete surface when fixing the lattice material to a concrete surface, and can also function as a leveler to make the thickness uniform when applying a thickening material. [Means for solving the problem]

[0008] The anchor member of the present invention is an anchor member for fixing a lattice material that reinforces concrete in a concrete structure, and has a through hole for inserting and fixing the anchor body on a back side that is pressed against the concrete surface from the front side through which the anchor body is inserted, and a first groove into which the intersection portions of the lattice material fit is formed on the back side in an area other than the through hole.

[0009] In this way, the anchor member of the present invention has a through hole for inserting the anchor body, and a first groove into which the intersection portion of the lattice material fits is formed on the back side in the area other than the through hole, so that the through hole can function as a guide when drilling the hole, and by pressing the anchor member against the concrete surface with the intersection portion of the lattice material fitted into the first groove, it is possible to fix the lattice material in place by preventing it from sliding in a direction parallel to the concrete surface.

[0010] The anchor member according to the present invention has a thickness corresponding to the design thickness of the reinforcing layer formed by embedding the lattice material in a thickening material.

[0011] In this way, the anchor member of the present invention has a length corresponding to the design thickness of the reinforcing layer formed by embedding the lattice material in the thickening material, so that the anchor member functions as a leveller, and by installing the thickening material so that the anchor member is buried, it is possible to meet the design thickness and achieve a uniform and smooth lining thickness regardless of the skill level of the worker.

[0012] The anchor member according to the present invention has a second recessed groove formed in the peripheral portion of the through hole on the front surface side, in which the head of the anchor body is stored.

[0013] As described above, in the anchor member according to the present invention, a second groove in which the head of the anchor body is stored is formed in the peripheral portion of the through hole on the front surface side, making it easier to push the anchor body in and containing the head of the anchor body within the thickness of the anchor member, thereby preventing the head of the anchor body from protruding from the covering surface.

[0014] The anchor member according to the present invention has a convex body formed on a part or the whole area of ​​the front surface other than the through hole.

[0015] In this way, in the anchor member of the present invention, a convex body is formed in some or all of the areas other than the through hole on the surface side, which has the effect of increasing the contact area with the thickening material and improving adhesion.

[0016] In the anchor member according to the present invention, the convex body formed on the front surface side is formed to correspond to the position of the first groove formed on the back surface side.

[0017] In this way, in the anchor member of the present invention, the convex body formed on the front side is formed to correspond to the position of the first groove formed on the back side, so that when the anchor member is installed at the intersection of the lattice material, the position of the first groove can be confirmed from the front side and serves as a guide for aligning the first groove with the intersection of the lattice material, thereby improving work efficiency.

[0018] The anchor member according to the present invention has a part or all of its edge portions formed on the front surface side chamfered.

[0019] In this way, in the anchor member of the present invention, some or all of the edge portions formed on the surface side are chamfered, which has the effect of dispersing the stress concentrated in the edge portions and reducing the load on the thickening material. [Brief description of the drawings]

[0020] [Figure 1] 1 is an overall perspective view of an anchor member according to a first embodiment. [Diagram 2] 2A and 2B are a plan view and a bottom view of the anchor member according to the first embodiment. [Diagram 3] 2A and 2B are front and rear views of the anchor member according to the first embodiment. [Figure 4] 1A and 1B are right and left side views of an anchor member according to a first embodiment. [Diagram 5] FIG. 2 is a diagram showing a cross-sectional view from the front when reinforcement using anchor members according to the first embodiment is completed, and a lattice material. [Figure 6] FIG. 11 is a plan view of an anchor member according to another embodiment. [Figure 7] 13A and 13B are plan views showing other shapes of anchor members according to other embodiments. [Figure 8] FIG. 13 is a diagram showing a state in which a lattice material is fixed by a conventional anchor body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (First embodiment of the present invention) The anchor member according to this embodiment will be described with reference to Figs. 1 to 5. The anchor member according to this embodiment is used to temporarily fix a lattice material laid on a concrete surface when reinforcing the inner wall surface of a concrete structure such as a tunnel. Fig. 1 is an overall perspective view of the anchor member according to this embodiment, Fig. 2 is a plan view and a bottom view of the anchor member according to this embodiment, Fig. 3 is a front member and a back view of the anchor member according to this embodiment, Fig. 4 is a right side view and a left side view of the anchor member according to this embodiment, and Fig. 5 is a cross-sectional view from the front when reinforcement using the anchor member according to this embodiment is completed (a cross-sectional view seen from the arrow a when reinforcement is completed in Fig. 2(A)) and a view showing the lattice material.

[0022] The anchor member 1 comprises a through hole 11 for inserting an anchor body 21 formed at a position shifted from the center position toward any of the four corners, a concave groove portion 12 formed on the bottom side (hereinafter referred to as the back side) of an area different from the through hole 11 and into which the intersection portion of the lattice material fits, a storage groove 13 for storing a head 21a of the anchor body 21 when it is driven in, and a convex portion 14 formed on the flat side (hereinafter referred to as the front side) of an area different from the storage groove 13 and for improving adhesion with the thickening material.

[0023] The anchor member 1 is formed in a rectangular shape when viewed from the surface, and the through hole 11 through which the anchor body 21 is inserted is formed in any one of the upper left, upper right, lower left, and lower right regions. The plan view of Fig. 2(A) shows the case where the through hole 11 is formed in the lower left region. The diameter of this through hole 11 is sized to match the diameter of the cylindrical portion 21b of the anchor body 21 to be used, as shown in Fig. 5, and a cylindrical storage groove 13 having a diameter and depth larger than the diameter of the through hole 11 and capable of storing the head 21a of the anchor body 21 is formed on the surface side of the through hole 11. That is, as shown in Fig. 5, when the anchor body 21 is inserted through the through hole 11 and fixed, the head 21a of the anchor body 21 is stored in the storage groove 13.

[0024] As shown in Fig. 5(B), the lattice material 30 laid on the concrete surface 70 to be reinforced is made up of multiple strips (hereinafter referred to as vertical strips 31) arranged in parallel in the vertical direction and multiple strips (hereinafter referred to as horizontal strips 32) arranged in parallel in the horizontal direction, which are hardened with resin in a crossed state. Fig. 5(B) shows a state in which two lattice materials 30 are laid with some overlapping and fixed at multiple points with anchor members 1.

[0025] On the back side of the anchor member 1, a groove 12 is formed that fits into the intersection 40 of the lattice material 30. The vertical band 31 of the lattice material 30 fits into the groove 12a, and the horizontal band 32 of the lattice material 30 fits into the groove 12b. The width of these grooves 12 is set to match the widths of the vertical bands 31 and horizontal bands 32 of the lattice material 30 so that each band can be completely stored within the groove 12.

[0026] Furthermore, in the case of the anchor member 1 used in an area where the lattice material 30 is laid alone, the depth of the groove portion 12 is set to a depth sufficient to accommodate at least one layer of the vertical bands 31 and the horizontal bands 32. In the case of the anchor member 1 used in the joint area 41 of the lattice material 30 (corresponding to the case in Figure 5), the vertical bands 31 and the horizontal bands 32 are each stacked in two layers, so the depth is set to a depth sufficient to accommodate at least two layers.

[0027] The vertical bands 31 and horizontal bands 32 of the lattice material 30 do not necessarily have to have the same strength. For example, when the lattice material 30 is used to reinforce the inside of a headrace tunnel for hydroelectric power generation, the water hammer effect caused by the generator's momentary interruption may cause the internal water pressure to rise by several meters to several tens of meters in the radial direction of the lining concrete, which is the inner wall surface of the tunnel. Therefore, stress corresponding to the increase in internal water pressure acts on the lining concrete of the inner wall surface of the tunnel in the radial direction. On the other hand, stress corresponding to the increase in internal water pressure acting on the axial direction of the lining concrete of the inner wall surface of the tunnel does not act because the intake is open. That is, when reinforcing the inside of the headrace, a large axial stiffness is required in the circumferential direction of the lining concrete of the inner wall surface of the headrace tunnel, but a large axial stiffness is not required in the axial direction. In such a situation, it does not matter if the axial stiffness of the band along the axial direction of the headrace is smaller than the axial stiffness of the band along the circumferential direction of the headrace. From the above, for example, in reinforcing a headrace tunnel, the vertical bands 31 may be formed of carbon fiber or the like that can increase axial stiffness and arranged along the axial direction of the headrace tunnel, and the horizontal bands 32 may be formed of glass fiber or the like that may have low axial stiffness. Furthermore, when glass fiber or the like that has low axial stiffness is used, bending (floating) of the lattice material 30 due to misalignment as shown in Fig. 8 is more likely to occur, but the use of the anchor member 1 according to this embodiment makes it possible to solve such a problem.

[0028] The convex portion 14 is formed on the surface of the anchor member 1, and the thickening material 50 is applied further on the surface side thereof. As shown in Fig. 5(A), compared to when the surface of the anchor member 1 has a flat shape, the formation of the convex portion 14 increases the contact area between the thickening material 50 and the anchor member 1, while increasing the contacting edge portion 51 (the portion shown by the dashed line in Fig. 5(A)) allows the thickening material 50 to spread widely into the gaps of the edges, thereby improving the adhesion between the anchor member 1 and the thickening material 50.

[0029] In addition, the edges of the convex portion 14 are chamfered. This is because, when the thickening material 50 is applied so as to cover the convex portion 14, stress is concentrated on the non-chamfered edge portion, which may cause cracks in the applied thickening material 50. It is preferable to chamfer the edges of any area other than the convex portion 14 where the thickening material 50 is applied.

[0030] If the design thickness to which the thickening material 50 should be applied is D, and the height from the bottom surface of the anchor member 1 to the top of the convex portion 14 (i.e., the thickness of the anchor member 1) is H, the length H of the anchor member 1 is set so that H + (1 to 2 mm) = D. Then, after the lattice material 30 is fixed with the anchor member 1, the base layer 50a of the thickening material 50 is applied to the extent that the top of the convex portion 14 is barely visible, and as a finishing touch, a thin layer 50b is formed so that the top of the convex portion 14 is completely invisible. In other words, since the base layer 50a of the thickening material 50 can be applied according to the length H of the anchor member 1, it is possible to make the anchor member 1 function as a leveler.

[0031] It should be noted that the base layer 50a and the thin layer 50b of the thickening material 50 are distinguished for the sake of convenience in the work process, and ultimately become an integrated lining layer made of the same material.

[0032] In addition, in FIG. 5(A) above, the anchor body 21 is described as having a return function in the cylindrical portion 21b, but this is merely one example, and a commonly known core rod-driven expansion anchor, a base expansion anchor, an adhesive anchor, etc. may also be used.

[0033] Furthermore, the thickening material 50 is formed by hardening a cement-based thickening material, for example, and may be made of polymer cement mortar, which is highly resistant to salt damage, neutralization, and the like.

[0034] Next, a description will be given of a procedure for using the anchor member 1 according to this embodiment. First, when a conventional core rod driving type expansion anchor is used, the procedure is as follows. (1) Position the lattice material 30 with your left hand (2) Using an impact driver with the right hand to drill holes (3) Switch the tool in your right hand to the anchor part and insert it into the drilled hole. (4) While supporting the anchor member with the left hand, the right hand is used to drive the anchor body in with a hammer to expand the tip.

[0035] As such, in the past, tools had to be changed between drilling holes and driving in anchors, and two workers were required to support the lattice material 30 to prevent it from shifting until it was fixed to a certain extent, which made the work less efficient.

[0036] In contrast to this, when the anchor member 1 according to this embodiment is used, the following procedure is followed. (1) Position the lattice material 30 while holding it down with the anchor member 1 using your left hand. (2) Using an impact driver with the right hand to drill holes (3) Switch your right hand to the anchor member and insert the anchor body 21 (when using the barbed anchor body 21 shown in FIG. 5(A), no hammer strike is required) into the drilled hole.

[0037] In this way, one work step is shortened compared to the conventional method, and the left hand only needs to hold the anchor member 1 from the beginning, and there is no need to change tools, which improves work efficiency. In addition, to prevent the lattice material 30 from shifting, two people are required to work on the first location, but after the lattice material 30 is fixed in one location, the position of the lattice material 30 is determined, and the groove portion 12 prevents it from sliding and shifting in a direction parallel to the concrete surface 70. This allows each worker to fix the anchor member 1, and significantly improves work efficiency. Furthermore, the through hole 11 of the anchor member 1 can function as a guide hole when determining the drilling position for inserting the anchor body 21, which improves the efficiency of the drilling work.

[0038] In particular, in the case of concrete structures such as power generation water channels and long-distance tunnels, there may be thousands or tens of thousands of locations where anchor members need to be fixed, and reducing the time required for one operation leads to an extremely significant reduction in the amount of work required.

[0039] As described above, the anchor member 1 of this embodiment has a through hole 11 for inserting the anchor body 21, and a groove portion 12 into which the intersection portion of the lattice material 30 fits is formed on the back side in the area other than the through hole 11.Therefore, by pressing the anchor member 1 against the concrete surface 70 with the intersection portion 40 of the lattice material 30 fitted into the groove portion 12, the lattice material 30 can be fixed without sliding laterally.

[0040] In addition, since the anchor member 1 has a thickness H corresponding to the design thickness D of the reinforcing layer formed by burying the lattice material 30, the anchor member 1 functions as a leveller, and by constructing the thickening material 50 so that the anchor member 1 is buried, the design thickness D is satisfied, and the lining thickness can be finished uniformly and smoothly regardless of the skill level of the worker.

[0041] Furthermore, since a storage groove 13 in which the head 21a of the anchor body 21 is stored is formed on the peripheral portion of the through hole 11 on the surface side, the head 21a of the anchor body 21 fits neatly within the range of the length H of the anchor member 1 and is prevented from protruding from the lining surface.

[0042] Furthermore, since the convex portions 14 are formed in a part or the whole area other than the through holes 11 on the surface side, the contact area with the thickening material 50 can be increased, thereby improving adhesion.

[0043] Furthermore, since some or all of the edge portions formed on the surface side are chamfered, the stress concentrated on the edge portions can be dispersed, thereby reducing the load on the thickened material.

[0044] (Other embodiments) The anchor member according to this embodiment will be described with reference to Figures 6 and 7. The anchor member 1 according to this embodiment is another example of the anchor member 1 according to the first embodiment. Note that in this embodiment, explanations that overlap with those in the first embodiment will be omitted, and explanations of contents that are self-evident from the technical contents of the first embodiment will be omitted.

[0045] Fig. 6 is a plan view of the anchor member according to this embodiment. The anchor member 1 has a structure having a convex portion 14 on the front surface as in the first embodiment, but this convex portion 14 is formed to correspond to the position of the concave groove portion 12 formed on the back surface side. In Fig. 6, the concave groove portion 12 (convex groove portions 12a and 12b) is shown by a dashed line, and is actually formed on the back surface side. In Fig. 6, the convex portion 14 and the concave groove portion 12 are shown slightly shifted from each other for ease of understanding, but they may be formed in completely matching positions and sizes.

[0046] As shown in Figure 6, by matching the position of the groove portion 12 with the position of the convex portion 14, it is possible to align the band of lattice material 30 and the anchor member 1 (groove portion 12) on the back side by aligning the positions of the convex portion 14 and the band of lattice material 30 even when viewed from the front side, thereby improving work efficiency.

[0047] FIG. 7 is a plan view showing another shape of the anchor member according to the present embodiment. FIG. 7(A) is a rhombus when viewed from the front side, and a groove portion 12 shown by a dashed line is formed on the back side along the diagonal line of the rhombus. By aligning the groove portion 12 with the strips (vertical strips 31 and horizontal strips 32) of the lattice member 30 so as to overlap, the groove portion 12 can be easily fitted into the lattice member 30. FIG. 7(B) is a circle when viewed from the front side, and in this case, by making the anchor member 1 a transparent material, the groove portion 12 shown by a dashed line formed on the back side can be easily fitted into the lattice member 30. FIG. 7(C) is a shape that combines a cross-shaped region 61 in which the groove portion 12 is formed on the back side and a surface region 62 in which the through hole 11 is formed when viewed from the front side. In this case, by aligning the cross-shaped region 61 with the lattice member 30, the groove portion 12 shown by a dashed line formed on the back side can be easily fitted into the lattice member 30.

[0048] 7, the convex portion 14 and the chamfered edge portions are omitted, but it is desirable to have the convex portion 14 and the chamfered edge portions as in the first embodiment. In this case, the position and shape of the convex portion 14 may be arbitrary as in the first embodiment, or may be formed to correspond to the position of the concave groove portion 12 as described above in FIG.

[0049] As described above, in the anchor member 1 of this embodiment, the convex portion 14 formed on the front side and the shape of the anchor member 1 itself are formed to correspond to the position of the concave groove portion 12 formed on the back side. This makes it easy to align the concave groove portion 12 with the strip of lattice material 30 when pressing the anchor member 1 from above the lattice material 30, thereby improving work efficiency. [Explanation of symbols]

[0050] 1 Anchor member 11 Through hole 12(12a,12b) Concave groove part 13 Storage Groove 14 Convex part 21 Anchor body 21a Head 21b Cylindrical part 30 Lattice material 31 Vertical Belt 32 Horizontal band 40 Intersection 50 Thickening material 50a base layer 50b thin layer 51 Edge section 70 Concrete surface

Claims

[Claim 1] An anchor member for fixing a lattice material that reinforces the concrete surface of a concrete structure, a through hole for inserting and fixing the anchor body on a back side which is pressed against the concrete surface from a front side through which the anchor body is inserted, and a first groove into which an intersection portion of the lattice material fits is formed on the back side in an area other than the through hole, The surface side has a first region in which a second groove in which a head of the anchor body is stored is formed at a peripheral portion of the through hole, and a second region which is formed thicker than the first region and has a thickness corresponding to a design thickness of a reinforcing layer formed by embedding the lattice material with a thickening material, the second region being formed of a convex body which is convex at a steep angle with respect to the first region, the protruding body is formed at a position corresponding to a position of the first groove formed on the back surface side, An anchor member characterized in that some or all of the edge portions formed on the front surface side are chamfered to form a surface to which the thickening material is in close contact.

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