Reinforcement devices and methods for existing structural frames

Abstract

The present invention provides a reinforcing device and method for existing slope frames that can improve the integration between the existing slope frame and a reinforced slope frame formed by spraying concrete or the like around it. [Solution] The additional concrete formwork 11 is provided with a pair of wire meshes 11a, 11a attached to each side of the existing slope frames 2a, 2b to be reinforced, spaced apart by spacing members 11b. The additional concrete formwork 11 is provided with main reinforcing bars 12 placed on top of the existing slope frames 2a, 2b, and fixing members 13 which are fixed at the intersection point 2c of the existing slope frames 2a, 2b, with a horizontal section 13a passing over the main reinforcing bars 12 passing through the intersection point 2c, and fixed therein. The intersecting main reinforcing bars 12, 12, the main reinforcing bars 12 and the spacing-maintaining horizontal bars 11b1, the main reinforcing bars 12 and the fixing members 13, etc. are appropriately bound together with binding members 14, and mortar or concrete is sprayed so that these members are embedded to form the additional concrete formwork around the existing slope frames 2a, 2b.

Description

Technical Field

[0001] The present invention relates to a reinforcing tool and a reinforcing method for an existing retaining wall frame for improving the integration of an existing retaining wall frame reinforcing a slope and a shotcrete frame obtained by shotcreting mortar or concrete so as to cover the periphery of the existing retaining wall frame.

Background Art

[0002] For a retaining wall frame constructed by spraying mortar or concrete to reinforce a slope, the surface mortar peels off or cracks (fissures) occur due to aging, and there is a need for repair. In addition, there is a need to reinforce retaining wall frames with insufficient strength. When repairing or reinforcing an existing retaining wall frame (hereinafter referred to as an existing retaining wall frame), if the existing retaining wall frame is destroyed and a new retaining wall frame is constructed, it will cost a lot. Therefore, an embedded formwork (hereinafter referred to as a shotcrete formwork) for shotcreting mortar or concrete around the existing retaining wall frame is arranged, and a technique has been proposed in which mortar or concrete (hereinafter may be abbreviated as concrete, etc. as appropriate) is shotcreted on the surface part of the existing retaining wall frame so as to embed this shotcrete formwork (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method for reinforcing an existing retaining wall frame described in Patent Document 1 above, since only the construction of shotcreting concrete or the like around the existing retaining wall frame is performed, there is a problem that the integration between the existing retaining wall frame and the shotcrete frame formed by shotcreting concrete or the like is insufficient.

[0005] Therefore, the present invention has been made in view of these problems, and aims to provide a reinforcing device and reinforcing method for existing slope frames that can improve the integration between the existing slope frame and the reinforced slope frame formed by spraying concrete or the like around it. [Means for solving the problem]

[0006] To solve the above problems, the reinforcing device for existing scaffolding according to the present invention is characterized by comprising: a formwork for additional spraying, in which a pair of wire meshes, each provided at a predetermined interval via a spacing member, are installed on both sides of the existing scaffolding; main reinforcing bars installed in the longitudinal direction of the existing scaffolding; and a fixing member having a main reinforcing bar intersection portion that intersects with the main reinforcing bars, and which is provided with a post-construction anchor fixed to the existing scaffolding. Furthermore, the reinforcing device for existing structural frames according to the present invention is characterized in that the fixing member is formed in a U-shape by a horizontal portion which serves as the intersection of the main reinforcing bars and vertical portions provided on each side of the horizontal portion, and the post-installed anchors are provided at the lower ends of each of the vertical portions. Furthermore, the reinforcing device for existing structural frames according to the present invention is characterized in that the fixing member is formed in an L-shape by a horizontal portion which serves as the intersection of the main reinforcing bars and a vertical portion provided on one side of the horizontal portion, and the post-installed anchor is provided at the lower end of the vertical portion. Furthermore, in the reinforcement device for existing structural frames, the fixing member is formed in an M shape by a V-shaped portion and vertical portions provided on both sides of the V-shaped portion, and the V-shaped curved portion that forms the boundary between the V-shaped portion and the vertical portion becomes the intersection of the main reinforcement bars, and the post-installed anchors are provided at the lower ends of each of the vertical portions. Furthermore, the reinforcing device for existing slope frames according to the present invention is also characterized in that the spacing-holding member is provided with fixing pins that are driven into the slope surface via pin support portions. Furthermore, the reinforcing device for existing scaffolding according to the present invention is also characterized in that each pair of wire meshes is provided with a wire mesh notch, which is cut out to avoid existing scaffolding that intersects with the pair of wire meshes. Furthermore, in the method for reinforcing an existing scaffold according to the present invention, the main reinforcing bars constituting any of the above-mentioned reinforcing devices for an existing scaffold are temporarily placed on the existing scaffold to be reinforced, in the longitudinal direction thereof, and passing through the intersection points of the existing scaffolds that intersect with the existing scaffolds. Next, the fixing member is positioned at the intersection point on top of the main reinforcing bars so that the intersection of the main reinforcing bars intersects with the main reinforcing bars. The fixing member is then fixed at the intersection point by fixing the post-installed anchors provided on the fixing member to the intersection point. Next, the fixing member and The method is characterized by placing the spacing member of the additional spray formwork over the main reinforcement bars and installing the wire mesh on both sides of the existing formwork, while binding the fixing member, the main reinforcement bars, and the spacing member together with a binding member at the intersection, and binding the main reinforcement bars and the spacing member together with a binding member on the existing formwork other than the intersection, and then spraying additional mortar or concrete onto the existing formwork so that the fixing member, the main reinforcement bars, and the additional spray formwork are filled in. Furthermore, in the method for reinforcing an existing scaffold according to the present invention, the pair of wire mesh constituting the formwork for additional spraying of any of the above-mentioned reinforcing devices for existing scaffolds is installed on both sides of the existing scaffold to be reinforced, the main reinforcing bars are temporarily placed on the spacing member so as to pass through the intersection of the existing scaffold, the fixing member is positioned at the intersection so as to intersect the main reinforcing bars from above, and the post-installed anchors provided on the fixing member are fixed to the intersection. The fixing member is fixed to the intersection point from above the main reinforcing bars and the spacing member. Next, the fixing member, the main reinforcing bars, and the spacing member are bound together with a binding member at the intersection point, while the main reinforcing bars and the spacing member are bound together with a binding member on the existing formwork other than the intersection point. Subsequently, mortar or concrete for additional spraying is sprayed onto the existing formwork so that the fixing member, the main reinforcing bars, and the formwork for additional spraying are embedded. [Effects of the Invention]

[0007] In the reinforcement device and reinforcement method for existing formwork according to the present invention, main reinforcing bars are placed on the existing formwork to be reinforced, and fixing members are placed so that the intersection of the main reinforcing bars of the fixing members intersects with the main reinforcing bars, and then fixed to the existing formwork by post-installed anchors provided on the fixing members. The formwork for additional concrete spraying, in which a pair of wire meshes are separated by spacing members at a predetermined distance, may be installed after the placement of the main reinforcing bars or before the placement of the main reinforcing bars, and finally, concrete is sprayed so that these reinforcement devices are embedded to form the formwork for additional concrete spraying. Therefore, since the main reinforcing bars placed on top of the existing slope frame intersect with the main reinforcing bar intersections of the fixing members fixed to the existing formwork by post-installed anchors, the additional concrete-sprayed slope frame is formed after this intersection. This improves the integration between the existing slope frame and the additional concrete-sprayed slope frame formed by spraying concrete around it. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of a formwork for additional spraying that constitutes a reinforcing device for an existing concrete frame according to an embodiment of the present invention. [Figure 2] This is a front view showing the state in which the formwork for additional pouring, which constitutes the reinforcing device for the existing slope frame according to an embodiment of the present invention, is fixed to the existing slope frame. [Figure 3] (a) to (c) are front view, plan view, and partial cross-sectional front view of a U-shaped fixing member that constitutes a reinforcing device for an existing frame according to an embodiment of the present invention. [Figure 4] (a) to (c) are front view, plan view, and partial cross-sectional front view of the L-shaped fixing member that constitutes the reinforcing device for the existing frame according to the embodiment of the present invention. [Figure 5] This is a simplified front view showing an example of an existing slope frame that is reinforced by the existing slope frame reinforcement method 1 of the embodiment of the present invention. [Figure 6] (a) and (b) are diagrams illustrating the procedure of the reinforcement method 1 for existing scaffolding according to an embodiment of the present invention, and are enlarged views showing the main reinforcing bars temporarily placed at the horizontally aligned intersection of anchor holes in the existing scaffolding, and a cross-sectional view thereof along line AA. [Figure 7](a) and (b) are diagrams illustrating the procedure of the reinforcement method 1 for existing scaffolding according to an embodiment of the present invention, and are enlarged views showing the state in which the main reinforcing bars have been temporarily placed at the horizontal intersection of the anchor holes of the existing scaffolding, and then the fixing members have been fixed on top of them, and a cross-sectional view of the same shown along line BB. [Figure 8] (a) and (b) are diagrams illustrating the procedure of the reinforcement method 1 for existing scaffolding according to an embodiment of the present invention, and are enlarged views showing the state in which the main reinforcing bars have been temporarily placed at the diagonally aligned intersection points of the anchor holes of the existing scaffolding, and then the fixing members have been fixed on top of them, and a cross-sectional view of the same along line CC. [Figure 9] (a) and (b) are diagrams illustrating the procedure of the reinforcement method 1 for existing scaffolding according to an embodiment of the present invention, and are enlarged views showing the state in which the main reinforcing bars are tied to the fixing members fixed at the horizontal intersection of the anchor holes of the existing scaffolding using binding members, and a cross-sectional view thereof along line DD. [Figure 10] (a) and (b) are diagrams illustrating the procedure of the reinforcement method 1 for existing slope frames according to an embodiment of the present invention, and are partial cross-sectional views showing a state in which a spacing-holding member for additional formwork is placed over a fixing member fixed to the horizontal intersection of anchor holes in the existing slope frame and the main reinforcing bars bound thereto, and a partial cross-sectional view showing the state of the existing slope frame in the vertical direction in that state. [Figure 11] (a) and (b) are diagrams illustrating the procedure of the existing slope reinforcement method 1 according to an embodiment of the present invention, respectively, and are side views showing the installation state of wire mesh installed on the side of the existing slope in the vertical direction and side views showing the installation state of wire mesh installed on the side of the existing slope in the horizontal direction. [Figure 12] (a) and (b) are a front view and a plan view, respectively, of an M-shaped fixing member, which is a modified example 1 of the fixing member constituting the reinforcing device for an existing scaffolding frame according to an embodiment of the present invention. [Figure 13] (a) and (b) are side views showing the installation state of modified examples 1 and 2 of the wire mesh constituting the reinforcing device for the existing frame according to the embodiment of the present invention. [Figure 14] (a) and (b) are partial cross-sectional views showing the state of the reinforcing device installed at the intersection of the existing slope frame by the existing slope frame reinforcement method 2 of the embodiment of the present invention, and partial cross-sectional views showing the state of the reinforcing device installed on the existing slope frame, respectively. [Figure 15] It is a front view showing a modification example of a fixing pin that constitutes a reinforcing tool for an existing legal framework according to an embodiment of the present invention.

Embodiments for Implementing the Invention

[0009] Hereinafter, embodiments and modification examples of a reinforcing tool for an existing legal framework according to the present invention will be described. Note that the embodiments and modification examples described below are merely examples of the present invention, and the present invention is not limited to the following embodiments and modification examples, and can be appropriately changed within the scope of the creation of the technical idea of the present invention

[0010] [[ID=1十二]] <Configuration of the Reinforcing Tool for the Existing Legal Framework in the Embodiment> The reinforcing tool 1 for the existing legal framework in the embodiment is composed of a formwork 11 for additional spraying, a main reinforcing bar 12, a U-shaped fixing member 13 and an L-shaped fixing member 13' which are fixing members, a binding member 14 for binding them, etc., and is a member for reinforcing the vertical existing legal framework 2a and the horizontal existing legal framework 2b of the existing legal framework 2 constructed on the slope surface 3 as shown in FIG. 5 and the like to be described later.

[0011] (Formwork 11 for Additional Spraying) The formwork for additional spraying 11 is a well-known member that installs a pair of wire meshes 11a, and 11a at intervals on both sides of the existing legal framework 2 via a spacing retaining member 11b as shown in FIGS. 1 and 2, etc., and is an embedded formwork for additional spraying of concrete or the like around the existing legal framework 2 to be repaired or reinforced.

[0012] In FIG. 1, since the longitudinal length L1 of the pair of wire meshes 11a, 11a is shown abbreviated and shortened, only one set of the spacing retaining member It is shown in the figure, but actually a plurality of sets of the spacing retaining member 11b are provided at predetermined intervals in the longitudinal direction of the pair of wire meshes 11a, 11a. Note that the actual length L1 of the pair of wire meshes 11a, 11a is set to a length that fits between the vertically existing legal frameworks 2a, 2a and between the horizontally existing legal frameworks 2b, 2b separated by a predetermined distance as shown in FIG. 10 and the like to be described later.

[0013] The pair of wire mesh 11a,11a are made of crimped wire mesh, which is formed in a rectangular shape when viewed from the side (see Figure 10) by weaving together multiple pre-processed vertical wires 11a1 and multiple horizontal wires 11a2, as shown in Figure 1. Here, the intersections of the vertical wires 11a1 and horizontal wires 11a2 of the pair of wire mesh 11a,11a are not welded or otherwise constructed to shift or deform slightly when external force is applied. Of course, the pair of wire mesh 11a,11a are not limited to crimped wire mesh; simply welded wire mesh or the like may also be used.

[0014] The spacing member 11b is a member installed at a certain interval on both the left and right sides of the existing frame 2 to be reinforced, etc., of the pair of wire mesh 11a, 11a. Multiple sets are provided at predetermined intervals in the longitudinal direction of the pair of wire mesh 11a, 11a. As shown in Figures 1 and 2, it consists of a spacing horizontal bar 11b1, a pair of vertical bars 11b2, 11b2 for supporting fixing pins and vertical bars 11b3, 11b3 for regulating the position of main reinforcement bars, a pair of horizontal bars 11b4, 11b4 for supporting fixing pins and fixing pins 11b5, 11b5.

[0015] As shown in Figure 2, the spacing-maintaining horizontal bar 11b1 is a metal rod (shaft) made of stainless steel or iron, having a length L2 that is greater than or equal to the width W1 of the existing frame 2, with both ends bent into an arc, and is rotatably connected to the vertical wires 11a1, 11a1 that make up the wire mesh 11a, 11a on both the left and right sides.

[0016] The pair of vertical support bars 11b2, 11b2 for fixing pins are welded to the spacing horizontal bar 11b1 at intervals W3 that are greater than or equal to the width W1 of the existing slope frame 2, and are provided to extend vertically. They are metal rods (shafts) made of iron, stainless steel, or the like, with a length L3 that is longer than the height H1 of the existing slope frame 2 and shorter than the height H2 of the wire mesh 11a, 11a.

[0017] The pair of vertical bars 11b3, 11b3 for regulating the position of the main reinforcement bars are iron or other rod-shaped members (shaft members) that primarily regulate (determine) the horizontal position of the main reinforcement bars 12 relative to the spacing member 11b, thereby preventing misalignment of the main reinforcement bars 12. They are welded to the spacing horizontal bar 11b1 at intervals of width W4, which is less than the width W1 of the existing slope frame 2, on the inside of the pair of vertical bars 11b2, 11b2 for supporting the fixing pins in the spacing horizontal bar 11b1. As shown in Figure 2, the vertical bars 11b3, 11b3 are configured to be short in length L4 such that their lower ends do not come into contact with the upper surface of the existing slope frame 2 when the formwork 11 for additional spraying is placed over the existing slope frame 2.

[0018] Each of the pair of horizontal bars 11b4, 11b4 for supporting the fixing pins is attached with its outer end bent in a rounded shape so that it hooks onto the vertical wires 11a1 of the pair of wire mesh 11a, 11a, allowing the pair of wire mesh 11a, 11a to be folded. The intermediate part is a member welded to each of the vertical bars 11b2, 11b2, and as shown in Figure 2(b), it is provided with fixing pin fitting guide parts 11b41, 11b41 on the inside that fit the fixing pins 11b5, 11b5 and guide their insertion.

[0019] The fixing pins 11b5, 11b5 are fitted into the fixing pin fitting guide portions 11b41, 11b41 of the pair of fixing pin support horizontal bars 11b4, 11b4, respectively, and driven into the slope 3 to fix the spacing holding member 11b of the formwork for additional spraying 11 to the slope 3.

[0020] (Main reinforcement 12) The main reinforcement bars 12 are well-known deformed reinforcement bars that are placed on top of the existing slope frame 2, which is the existing vertical slope frame 2a and the existing horizontal slope frame 2b that are to be reinforced, as shown in Figures 6(a) and (b) described later. In this embodiment, for example, one bar is placed on each side of the upper surface of the existing vertical slope frame 2a and the existing horizontal slope frame 2b.

[0021] Furthermore, as shown in Figure 5 later, the slope 3 on which the existing slope frame 2 is constructed is formed on the slope of a mountain or the like, and is generally large in area. Therefore, the main reinforcement bars 12 are made by welding together deformed reinforcing bars of a predetermined length that can be transported by truck or the like on-site, either on their outer surfaces or end faces, to secure a length equal to the length of the existing slope frame 2.

[0022] (U-shaped fixing member 13) As shown in Figures 3(a) to (c), the U-shaped fixing member 13 is a member formed by bending both sides of a deformed reinforcing bar or steel bar at a 90-degree angle to form a U-shape. It has a horizontal section 13a that is slightly longer than the width W1 of the existing frame 2, and vertical sections 13b, 13b that are bent at approximately 90 degrees on both sides of the horizontal section 13a, with main reinforcing bar intersections between them. Post-installed anchors 13c, 13c are provided at the lower ends of the vertical sections 13b, 13b, respectively.

[0023] As will be described later, the horizontal section 13a passes above the main reinforcement bars 12 and is secured to the main reinforcement bars 12 and the spacing-maintaining horizontal bars 11b1 of the spacing-maintaining members 11b using binding members 14 such as binding wire.

[0024] Post-installed anchors 13c, 13c are well-known components that are inserted into holes drilled in the existing frame 2 and fixed in place. They may be metal anchors of the drive-in or tightening type, or adhesive anchors using capsule or injection adhesive.

[0025] Furthermore, the U-shaped fixing member 13 is used at the intersection point 2c between the existing vertical slope frame 2a and the existing horizontal slope frame 2b, as shown in Figure 5, which will be described later.

[0026] (L-shaped fixing member 13') As shown in Figure 4, the L-shaped fixing member 13' is a member formed in an L-shape by bending both sides of a deformed reinforcing bar or steel bar at a 90-degree angle. It has a main reinforcing bar intersection between a horizontal section 13a' and a vertical section 13b' which is formed by bending one side of the horizontal section 13a' at approximately a 90-degree angle, and a post-installed anchor 13c' is provided at the lower end of the vertical section 13b'.

[0027] As will be described later, the horizontal section 13a' has the main reinforcing bars 12 positioned below it, and the post-installed anchors 13c' that are tied and fixed to the main reinforcing bars 12 and the spacing-maintaining horizontal bars 11b1 of the spacing-maintaining members 11b using the binding members 14 are the same as those of the U-shaped fixing member 13.

[0028] Furthermore, as shown in Figure 5 described later, the L-shaped fixing member 13' is used at the intersection points 2c of the existing vertical slope frame 2a and the existing horizontal slope frame 2b, specifically at the left and right ends of the existing vertical slope frame 2a, 2a where two anchor insertion holes 2c1 are aligned diagonally, and at the intersection points 2c of the existing horizontal slope frame 2b in the vertical direction. Furthermore, since one L-shaped fixing member 13' fixes one main reinforcing bar 12, two L-shaped fixing members 13' are used for each intersection point 2c.

[0029] (Binding member 14) The binding member 14 is a well-known binding member such as binding wire or wire.

[0030] <Method for reinforcing an existing slope frame using the existing slope frame reinforcement device 1 of the embodiment> Next, methods 1 and 2 for reinforcing existing slope frames using the existing slope frame reinforcement device 1 configured as described above will be explained with reference to the drawings. In the following explanation, as shown in Figure 5, the existing slope frame reinforcement device 1 of the embodiment will be installed on all of the vertical existing slope frame 2a and horizontal existing slope frame 2b that constitute the existing slope frame 2 constructed on the slope 3, and concrete or the like will be sprayed to create an over-sprayed slope frame that covers the existing slope frame 2, thereby reinforcing or repairing the existing slope frame 2.

[0031] (Method 1 for reinforcing existing structural frameworks) First, as preparation, as shown in Figure 5, the surfaces of the existing vertical slope frame 2a and horizontal slope frame 2b that constitute the existing slope frame 2 to be reinforced on the slope 3 are cleaned using a water jet device (not shown), and two anchor insertion holes 2c1 for post-installed anchors 13c and 13c are drilled at the intersection point 2c of the vertical slope frame 2a and the horizontal slope frame 2b using a drill or the like.

[0032] In this case, on the slope 3 shown in Figure 5, the U-shaped fixing member 13 shown in Figure 3 is installed at the intersection point 2c of the vertical existing slope frame 2a and the horizontal existing slope frame 2b, which are located within the outer frame of the existing slope frame 2.

[0033] In contrast, in Figure 5, the L-shaped fixing member 13' shown in Figure 4 is installed at the intersection point 2c of the existing vertical slope frame 2a, 2a and the existing horizontal slope frame 2b located on the outer perimeter of the existing slope frame 2. As shown in Figure 5, at the vertical intersection point 2c of the existing vertical slope frame 2a, 2a at the left and right ends, two anchor insertion holes 2c1 are provided in the diagonal (angled) direction.

[0034] Furthermore, since the fixing members to be installed differ between the intersection point 2c where two anchor insertion holes 2c1 are formed horizontally and the intersection point 2c where two anchor insertion holes 2c1 are formed diagonally (at an angle), and the fixing members to be installed are U-shaped fixing member 13 and L-shaped fixing member 13', it is necessary to distinguish between them. Therefore, the former will be called "horizontally aligned anchor hole intersection point 2c" and the latter will be called "diagonally aligned anchor hole intersection point 2c".

[0035] (Temporary placement of main reinforcement bars 12) Next, as shown in Figures 6(a) and (b), the workers temporarily place one main reinforcing bar 12 on each side of the existing vertical slope frame 2a, and then temporarily place one main reinforcing bar 12 on each side of the existing horizontal slope frame 2b perpendicular to it.

[0036] (Fixing of the U-shaped fixing member 13 at the intersection point 2c of the horizontally aligned anchor holes) Next, in Figure 5, at the intersection points of the three central vertical existing slope frames 2a in the left-right direction and each horizontal existing slope frame 2b in the up-down direction, where two anchor insertion holes 2c1 are aligned horizontally, the worker positions the horizontal part 13a of the U-shaped fixing member 13 above the two main reinforcing bars 12 temporarily placed on the upper surface of the vertical existing slope frame 2a, as shown in Figures 7(a) and (b), so that the horizontal part 13a of the U-shaped fixing member 13 intersects above the two main reinforcing bars 12. The worker then drives the post-installed anchors 13c, 13c at the lower ends of the vertical parts 13b, 13b on both sides of the U-shaped fixing member 13 into the anchor insertion holes 2c1, 2c1 on the outside of the two main reinforcing bars 12, thereby fixing the post-installed anchors 13c, 13c to the anchor insertion holes 2c1, 2c1.

[0037] (Fixing of L-shaped fixing member 13' at the intersection point 2c of the diagonally aligned anchor holes) On the other hand, in Figure 5, at the intersection points of the vertical existing slope frames 2a, 2a at the left and right ends and the horizontal existing slope frames 2b in the vertical direction, where two anchor insertion holes 2c1 are aligned diagonally, at the anchor hole diagonal alignment intersection points 2c, there is a horizontal existing slope frame 2b on only one side of the vertical existing slope frames 2a, 2a at the left and right ends, and there are no horizontal existing slope frames 2b on both sides. Therefore, it is difficult to install the U-shaped fixing member 13, to which vertical parts 13b, 13b protrude on both sides of the vertical existing slope frame 2a and post-installed anchors 13c, 13c are sprayed.

[0038] Therefore, as shown in Figure 5, at the intersection points of the vertical existing slope frames 2a, 2a at the left and right ends and the horizontal existing slope frames 2b in the vertical direction, where two anchor insertion holes 2c1 are aligned diagonally, the worker, for example as shown in Figures 8(a) and (b), diagonally positions the L-shaped fixing member 13' so that its horizontal portion 13a' rests on the horizontal existing slope frame 2b which is above the intersecting vertical existing slope frame 2a and horizontal existing slope frame 2b, and then drives the post-installed anchors 13c at the lower ends of the vertical portions 13b' of each of the two sets of L-shaped fixing members 13' into the two anchor insertion holes 2c1 (see Figure 5) provided in the diagonal direction of the anchor hole diagonal intersection point 2c to fix them in place. Figures 8(a) and 8(b) show enlarged views of the diagonal intersection point 2c of the anchor holes, which is the intersection point of the existing vertical slope frame 2a at the far right of Figure 5 and the existing horizontal slope frames 2b in the 2nd to 4th rows from the top.

[0039] (The main reinforcing bars 12 are tied to the fixing member 13.) Next, at the horizontal intersection point 2c of the anchor holes where the U-shaped fixing member 13 is fixed, the worker lifts the two main reinforcing bars 12 that have been temporarily placed on the existing vertical slope frame 2a, as shown in Figures 9(a) and (b), until they touch the horizontal part 13a of the U-shaped fixing member 13, and then, as shown in Figures 7(a) and (b), ties the two main reinforcing bars 12 that have been temporarily placed on the upper surface of the existing vertical slope frame 2a to the horizontal part 13a of the U-shaped fixing member 13 using binding members 14 such as binding wire.

[0040] Furthermore, at the intersection point 2c of the horizontally aligned anchor holes, as shown in Figure 9(a), two horizontal main reinforcing bars 12 passing over the existing vertical frame 2a and two vertical main reinforcing bars 12,12 passing over the existing horizontal frame 2b intersect. Therefore, it is advisable to tie the main reinforcing bars 12,12 together at their intersections.

[0041] Furthermore, at the diagonal intersection points 2c of the anchor holes as shown in Figures 8(a) and 8(b), although not shown in the figures, similarly, at the two intersections where the two horizontal main reinforcing bars 12 passing over the existing vertical frame 2a in Figure 8(a) intersect with the two vertical main reinforcing bars 12, 12 passing over the existing horizontal frame 2b in Figure 8(a), the reinforcing bars should be bound together with the binding member 14. At the two intersections where the two vertical main reinforcing bars 12, 12 intersect with the horizontal portion 13a' of the L-shaped fixing member 13' fixed to the diagonal intersection points 2c of the anchor holes, the horizontal portion 13a' of the L-shaped fixing member 13' should also be bound together with the binding member 14.

[0042] (Installation of formwork 11 for additional spraying) Next, as described above, the formwork 11 for additional pouring is placed over the existing vertical slope frame 2a and horizontal slope frame 2b that need to be reinforced by fixing the main reinforcing bars 12, etc., at each intersection point 2c using U-shaped fixing members 13, L-shaped fixing members 13'L, and binding members 14.

[0043] Then, the pair of wire meshes 11a, 11a constituting the formwork 11 for additional spraying are installed on both the left and right sides of the existing vertical slope frame 2a and between the upper and lower existing horizontal slope frames 2b, 2b as shown in Figure 10(a), while on both the upper and lower sides of the existing horizontal slope frame 2b and between the left and right existing vertical slope frames 2a, 2a as shown in Figure 10(b).

[0044] Furthermore, at each intersection point 2c between the existing vertical slope frame 2a and the existing horizontal slope frame 2b, as shown in Figure 11(a), one of the pair of wire meshes 11a, 11a that constitute the formwork 11 for additional spraying is installed on the side of the existing vertical slope frame 2a to be reinforced so that it fits between the two existing horizontal slope frames 2b, 2b that are perpendicular to the existing vertical slope frame 2a.

[0045] On the other hand, on the sides of the existing horizontal slope frames 2b that need to be reinforced, other than at each intersection point 2c, one of the pair of wire meshes 11a, 11a that make up the formwork 11 for additional pouring is installed so that it fits between two vertical existing slope frames 2a, 2a that are perpendicular to the existing horizontal slope frames 2b, as shown in Figure 11(b).

[0046] Then, as shown in Figures 1 and 2, the pair of wire meshes 11a, 11a that constitute the formwork 11 for additional spraying are separated by spacing horizontal bars 11b1 that constitute the spacing member 11b, and since the spacing horizontal bars 11b1 rest on two main reinforcing bars 12 that are tied to a U-shaped fixing member 13 by a binding member 14, the spacing horizontal bars 11b1 that intersect the two main reinforcing bars 12, 12 above the existing vertical slope frame 2a or the existing horizontal slope frame 2b are tied together by the binding member 14, as shown in Figures 11(a) and (b).

[0047] In this case, as shown in Figure 2, vertical bars 11b3, 11b3 for regulating the position of main reinforcing bars are provided on the spacing horizontal bar 11b1 at intervals slightly narrower than the width of the existing vertical slope frame 2a and the existing horizontal slope frame 2b. As shown in Figures 11(a) and (b), the vertical bars 11b3, 11b3 regulate the horizontal position of the two main reinforcing bars 12 above the existing vertical slope frame 2a or the existing horizontal slope frame 2b, preventing misalignment, while each vertical bar 11b3 for regulating the position of main reinforcing bars is also bound to the spacing horizontal bar 11b1 and the main reinforcing bars 12 by the binding member 14.

[0048] Then, at the intersection point 2c of the existing vertical slope frame 2a and the existing horizontal slope frame 2b, as shown in Figure 11(a), the U-shaped fixing member 13 is fixed by post-installed anchors 13c, 13c, so the formwork 11 for additional spraying can be fixed to the existing vertical slope frame 2a or the existing horizontal slope frame 2b by fastening members 14 via the post-installed anchors 13c, 13c.

[0049] On the other hand, on the existing vertical slope frame 2a or horizontal slope frame 2b other than the intersection point 2c, as shown in Figure 11(b), the formwork for additional spraying 11 is positioned on both sides of the existing vertical slope frame 2a, restricted by a pair of vertical rods 11b2, 11b2 for supporting fixing pins, which are attached to the spacing horizontal rod 11b1 of the spacing member 11b by welding or the like. The formwork is then appropriately secured to the spacing horizontal rod 11b1 or the vertical rods 11b2, 11b2 for supporting fixing pins by fastening members 14, and the fixing pins 11b5, 11b5 are driven into the slope 3 via a pair of horizontal rods 11b4, 11b4, thereby fixing the formwork for additional spraying 11 to the slope 3 on which the existing vertical slope frame 2a and horizontal slope frame 2b are constructed.

[0050] (Spraying of additional concrete) Finally, concrete is sprayed onto the formwork 11 for additional spraying, which is installed on the outside of the existing formwork 2 to be reinforced. This formwork includes a pair of wire mesh 11a, 11a and spacing members 11b, as well as the main reinforcing bars 12 and U-shaped fixing members 13. This fills the reinforcing components 1 of this embodiment, thereby forming an additional sprayed formwork that covers the outside of the existing formwork 2 to be reinforced. Note that spraying or applying a water absorption adjusting primer to the surface of the existing formwork 2 to be reinforced before spraying the concrete will further enhance the integration of the existing formwork 2 and the additional sprayed formwork.

[0051] <Summary of the reinforcing device 1 and reinforcing method for existing scaffolding according to the present invention> As described above, in the existing slope frame reinforcement device 1 and reinforcement method 1 of the embodiment of the present invention, the main reinforcing bars 12 are placed on the existing slope frame 2 to be reinforced, which are the vertical existing slope frame 2a and the horizontal existing slope frame 2b. At the intersection point 2c of the vertical existing slope frame 2a and the horizontal existing slope frame 2b, a U-shaped fixing member 13 is fixed to the main reinforcing bars 12, with a post-installed anchor 13c provided so that the horizontal part 13a intersects with the main reinforcing bars 12. Then, a pair of wire meshes 11a, 11a are installed on both sides of the existing slope frame 2 to be reinforced via spacing members 11b, and the spacing members 11b are tied to the main reinforcing bars 12, the U-shaped fixing member 13, etc. with a binding member 14 to install the formwork 11 for additional spraying.

[0052] Therefore, according to the reinforcement device 1 and reinforcement method 1 for existing slope frames of the present invention, the horizontal portion 13a of the fixing member 13 fixed to the existing formwork 2 by post-installed anchors 13c intersects with the main reinforcing bars 12 placed on top of the existing slope frame 2, and the additional concrete slope frame is formed thereafter. This improves the integration between the existing slope frame 2 and the additional concrete slope frame formed by spraying concrete around it.

[0053] In particular, in the method 1 for reinforcing an existing slope frame according to the embodiment of the present invention, the spacing member 11b of the formwork 11 for additional spraying is fixed to the existing slope frame 2 via a U-shaped fixing member 13 which is directly fixed to the existing slope frame 2 by a post-installed anchor 13c, or to the main reinforcing bars 12 which are indirectly fixed to the existing slope frame 2 via the U-shaped fixing member 13 and the binding member 14, thereby further improving the integration between the existing slope frame 2 and the additional spraying slope frame.

[0054] Furthermore, in the reinforcement device 1 for existing slope frames according to the embodiment of the present invention, the U-shaped fixing member 13 used at the horizontal intersection point 2c of the anchor holes of the vertical existing slope frame 2a and the horizontal existing slope frame 2b is formed in a U-shape by providing a horizontal part 13a as the main reinforcement intersection and vertical parts 13b, 13b on both sides of the horizontal part 13a, and post-installed anchors 13c, 13c are provided at the lower ends of the vertical parts 13b, 13b, respectively.

[0055] Therefore, the U-shaped fixing member 13 used at the horizontal intersection point 2c of the anchor holes is securely fixed to the horizontal intersection point 2c of the anchor holes by two post-installed anchors 13c, 13c, thereby further improving the integration of the existing slope frame 2 and the newly sprayed slope frame. Furthermore, by passing two main reinforcing bars 12, 12 through the vertical sections 13b, 13b and below the horizontal section 13a which serves as the main reinforcing bar intersection, and tying them together via the binding member 14, the two main reinforcing bars 12, 12 can be securely fixed to the U-shaped fixing member 13, thereby further improving the integration of the existing slope frame 2 and the newly sprayed slope frame formed by spraying concrete or the like.

[0056] Furthermore, in the reinforcing device 1 for existing scaffolding according to the embodiment of the present invention, an L-shaped fixing member 13' is provided, which has a horizontal section 13a' as the main reinforcement intersection, a vertical section 13b' on one side of the horizontal section 13a', and a post-installed anchor 13c' at the lower end of the vertical section 13b'.

[0057] Therefore, as shown in Figure 5, at the intersection points of the vertical existing slope frames 2a, 2a at the left and right ends and the five horizontal existing slope frames 2b in the vertical direction, where two anchor insertion holes 2c1 are aligned diagonally, there is a horizontal existing slope frame 2b on only one side of the vertical existing slope frames 2a, 2a at the left and right ends, and there are no horizontal existing slope frames 2b on both sides. As a result, it is difficult to install a U-shaped fixing member 13 in which post-installed anchors 13c, 13c are driven on both sides. However, as shown in Figures 8(a) and (b), an L-shaped fixing member 13' can be used. By using two sets and fixing them at the diagonal intersection of anchor holes 2c, both the existing vertical slope frame 2a and the existing horizontal slope frame 2b are passed under the horizontal portion 13a' of the L-shaped fixing member 13' so as to intersect, and pressed down from above. By fastening them via the binding member 14, both the intersecting existing vertical slope frame 2a and the existing horizontal slope frame 2b can be securely fixed from above at once, thereby further improving the integration between the existing slope frame 2 and the newly formed slope frame created by spraying additional concrete.

[0058] <Variation 1 of the fixing member> In the above description of the embodiment, the fixing member to be fixed at the horizontal intersection point 2c of the anchor holes of the existing vertical frame 2a and the existing horizontal frame 2b was described as a U-shaped fixing member 13 formed by a horizontal part 13a and vertical parts 13b, 13b on both sides, as shown in Figure 3, with post-installed anchors 13c, 13c provided at the lower ends of the vertical parts 13b, 13b, respectively. However, the present invention is not limited to this, and for example, as shown in Figure 12, deformed reinforcing bars, etc., can be used. It is also possible to use an M-shaped fixing member 13" which is formed by a V-shaped section 13a" and vertical sections 13b", 13b" provided on both sides of the V-shaped section 13a", and post-installed anchors 13c", 13c" are provided at the lower ends of the vertical sections 13b", 13b" respectively. In this case, the V-shaped curved sections 13d", 13d", which are the bending points between the V-shaped section 13a" and the vertical sections 13b", 13b", become main reinforcement intersections that intersect with the main reinforcement 12.

[0059] When using an M-shaped fixing member 13” formed in this manner, when tying the M-shaped fixing member 13” and the two main reinforcing bars 12, 12 with binding members 14 such as binding wire, the main reinforcing bars 12 will fit into the V-shaped curved sections 13d, 13d” which are bent at less than 90 degrees and form the boundary between the V-shaped section 13a” of the M-shaped fixing member 13” and the vertical sections 13b, 13b” on both sides. As a result, the two main reinforcing bars 12, 12 will be less likely to shift laterally, improving workability.

[0060] Furthermore, in the M-shaped fixing section 13", as shown in Figure 12(a), the vertical sections 13b, 13b" extending from both sides of the V-shaped section 13a" are set to be longer than the central lower end 13a1 of the V-shaped section 13a", and the upper ends 13c1, 13c1" of the post-installed anchors 13c, 13c" provided at the lower ends of the vertical sections 13b, 13b" are at the same height (on the same plane) as the central lower end 13a1 of the V-shaped section 13a". Therefore, when the M-shaped fixing section 13" is cast into the existing slope frame 2, the central lower end 13a1 of the V-shaped section 13a" comes into contact with the upper surface of the existing slope frame 2, which serves as an indicator of the completion of the casting of the M-shaped fixing section 13". This prevents cracks in the existing slope frame 2 caused by overcasting, improves workability, and ensures that the additional casting formwork 11 is securely installed.

[0061] <Modified examples 1 and 2 of a pair of wire mesh 11a, 11a> In the above description of the embodiment, the pair of wire mesh 11a, 11a constituting the formwork 11 for additional spraying are formed in a rectangular shape as shown in Figures 10(a) and (b), and are installed on the left and right sides of the existing vertical or horizontal slope frame 2a to be reinforced, and are installed between the existing horizontal or vertical slope frames 2a, 2a that intersect with the upper and lower horizontal slope frames 2b, 2b or the left and right vertical slope frames 2a, 2a, respectively. However, in the present invention, The invention is not limited to this, and of course, as shown in Figures 13(a) and (b), the ends of a pair of wire mesh 11a, 11a may be cut out to match the cross-sectional shape of the intersecting existing horizontal or vertical slope frame 2b or existing vertical slope frame 2a, thereby forming rectangular wire mesh cutouts 11a1, 11a1' that accommodate the intersecting existing horizontal or vertical slope frame 2b or existing vertical slope frame 2a, and the pair of wire mesh 11a, 11a' may be placed on top of the intersecting existing vertical or horizontal slope frame 2a or existing horizontal slope frame 2c.

[0062] Figure 13(a) shows the standard specification where the cross section of the existing horizontal slope frame 2b intersecting the existing vertical slope frame 2a to be reinforced is square. In this case, the pair of wire meshes 11a, 11a constituting the formwork 11 for additional spraying are provided with square wire mesh notches 11a1. Figure 13(b) shows the trapezoidal drainage mortar specification where the cross section of the existing horizontal slope frame 2b' intersecting the existing vertical slope frame 2a to be reinforced has a triangular drainage section 2b1'. In this case, the pair of wire meshes 11a, 11a constituting the formwork 11 for additional spraying are provided with trapezoidal wire mesh notches 11a1'.

[0063] By providing wire mesh notches 11a1 and 11a1' in the pair of wire meshes 11a, 11a that constitute the additional spraying formwork 11 according to the cross-sectional shapes of the intersecting horizontal existing slope frames 2b and 2b' as shown in modified examples 1 and 2 in Figures 13(a) and (b), the upper protruding portions of the wire mesh notches 11a1 and 11a1' in the pair of wire meshes 11a, 11a reach the intersection point 2c with the intersecting horizontal existing slope frames 2b and 2b', thereby further improving the integration of the existing slope frame 2 and the additional spraying formwork.

[0064] Furthermore, compared to a pair of wire meshes 11a, 11a in an embodiment without wire mesh notches 11a1, 11a1', when installing a pair of wire meshes 11a, 11a with wire mesh notches 11a1, 11a1' onto an existing scaffolding 2 to be reinforced, the protruding wire mesh portion above the wire mesh notches 11a1, 11a1' rests on the existing scaffolding 2, and the lower end of the vertical wires 11a1 constituting the wire mesh 11a catches on the upper surface of the intersection point 2c, making it easier to install the wire mesh 11a and improving workability.

[0065] <Method 2 for reinforcing existing slope frames> Next, a method 2 for reinforcing an existing slope frame using the reinforcing device 1 of this embodiment, configured as described above, will be explained.

[0066] In the above-described method 1 for reinforcing existing slope frames, the surfaces of the existing vertical slope frames 2a and horizontal slope frames 2b to be reinforced are cleaned, two main reinforcing bars 12 are temporarily placed on top of each of the cleaned vertical and horizontal slope frames 2a and horizontal slope frames 2b, then fixing members 13 and 13' are fixed from above the main reinforcing bars 12 at the intersection 2c of the vertical and horizontal slope frames 2a and horizontal slope frames 2b using post-installed anchors 13c and 13c, after which a formwork 11 for additional spraying is installed on top of them, fixing pins 11b5 and 11b5 are driven into the slope 3 to fix the formwork 11 for additional spraying to the slope 3, and then concrete for additional spraying is sprayed. The invention is not limited to this, but after cleaning the existing vertical slope frame 2a and horizontal slope frame 2b that need to be reinforced, etc., a formwork for additional spraying 11 is placed over them before arranging the main reinforcing bars 12 on top of them, a pair of wire mesh 11a, 11a are installed on both the left and right sides of the existing slope frame 2, and the spacing members 11b are fixed to the slope 3 with fixing pins 11b5, 11b5, then two main reinforcing bars 12 are temporarily placed, and at the intersection points 2c of the existing vertical slope frame 2a and the existing horizontal slope frame 2b, U-shaped fixing members 13 and L-shaped fixing members 13' are fixed from above the main reinforcing bars 12, respectively, and then concrete for additional spraying is sprayed.

[0067] Figure 14(a) shows the state of the existing vertical slope frame 2a, excluding the intersection 2c, where the formwork 11 for additional spraying is installed first and then the main reinforcement bars 12 are placed, according to the existing slope frame reinforcement method 2. Figure 14(b) shows the state of the intersection 2c, where the formwork 11 for additional spraying is installed first, then the main reinforcement bars 12 are placed, and then the U-shaped fixing member 13 is fixed, according to the existing slope frame reinforcement method 2. Although not shown in the figure, similar to the existing slope frame reinforcement method 1 described above, the intersecting main reinforcement bars 12, 12, and the main reinforcement bars 12 and the spacing-maintaining horizontal bars 11b1, fixing member 13, etc. are appropriately bound together with binding members 14, and finally, similar to the existing slope frame reinforcement method 1, concrete for additional spraying is sprayed so that these fixing devices 1 are embedded.

[0068] In the above explanation, the main reinforcing bars 12 were temporarily placed on the existing vertical frame 2a first, and then on the existing horizontal frame 2a. However, the present invention is not limited to this, and the main reinforcing bars 12 may be temporarily placed on the existing horizontal frame 2b first, and then on the existing vertical frame 2a. Furthermore, instead of placing two main reinforcing bars 12 on each of the existing vertical and horizontal frames 2a, one main reinforcing bar 12 may be placed on each, and of course, three or more main reinforcing bars 12 may be placed.

[0069] Furthermore, in the description of the above embodiment, it was explained that the reinforcing device 1 of this embodiment is installed on all of the existing slope frames 2, including the vertical existing slope frames 2a and the horizontal existing slope frames 2b that constitute the existing slope frame 2 constructed on the slope 3, and that concrete or the like is sprayed on to reinforce them. However, the present invention is not limited to this, and of course, the reinforcing device 1 of this embodiment may be installed on only a portion of the vertical existing slope frames 2a or the horizontal existing slope frames 2b, and that concrete or the like is sprayed on to repair or reinforce them.

[0070] Furthermore, in the above description of the embodiment, the fixing pins 11b5, 11b5 are a pair of straight rods as shown in Figures 1 and 2, but the present invention is not limited to this, and of course, as shown in Figure 15, the fixing pin 11b5' may be an integrated structure with a U-shape that straddles the existing slope frame 2 and has protruding parts 11b51', 11b51' on both the left and right sides. When the fixing pin 11b5' is an integrated structure with a U-shape in this way, the width of the protruding parts 11b51', 11b51' is constant so as to traverse the existing slope frame 2, so even when fixing with the fixing pins 11b5' at multiple locations, the width of the protruding parts 11b51', 11b51' is always constant, which improves the installation accuracy of the formwork for additional spraying, and the fixing force of the formwork 11 for additional spraying to the slope 3 by the integrated structure of the fixing pin 11b5' is also improved, so that the formwork 11 for additional spraying can be installed reliably.

[0071] Furthermore, in the description of the above embodiment, it was explained that the main reinforcing bars 12 cross and pass below the horizontal portion 13a of the U-shaped fixing member 13, the horizontal portion 13a' of the L-shaped fixing member 13', and the V-shaped curved portion 13d" of the M-shaped fixing member 13'', which are the main reinforcing bar intersections. However, the present invention is not limited to this, and of course, the main reinforcing bars 12 may also cross and pass above the main reinforcing bar intersections.

[0072] Furthermore, in the description of the above embodiment, it was explained that after installing the reinforcing member 1 of this embodiment, additional concrete or the like is sprayed to fill the existing slope frame 2 and the reinforcing member 1, thereby constructing an additional slope frame. However, the present invention is not limited to this, and additional concrete or the like may be sprayed by methods other than spraying concrete or the like. [Explanation of symbols]

[0073] 1. Reinforcement device for existing structural frames 11. Formwork for additional spraying 11a Wire mesh 11a1, 11a1' Wire mesh cutout 11b Spacing member 11b1 Spacing horizontal bar 11b2 Vertical support rod for fixing pins 11b3 Vertical bar for regulating the position of main reinforcing bars 11b4 Horizontal bar for fixing pin support 11b41 Fixed pin fitting guide 11b5 Fixing pin 12 Main reinforcing bars 13 U-shaped fixing member 13a Horizontal section (main reinforcement intersection) 13b Vertical section 13c Post-installed anchor 13' L-shaped fixing member 13a' Horizontal section (main reinforcement intersection) 13b' Vertical section 13c' Post-installed anchor 13" M-shaped fixing member 13a” V-shaped part 13b” vertical section 13c” Post-installed anchor 13d” V-shaped curved section (main reinforcement bar intersection) 14 Binding members 2 Existing Structural Frame 2a Existing vertical frame 2b Existing horizontal slope frame 2c Intersection 3. Slope

Claims

1. A formwork for additional spraying, in which a pair of wire meshes, each set at a predetermined distance apart via spacing members, are installed on both sides of the existing concrete frame, The main reinforcing bars are installed in the longitudinal direction of the aforementioned existing frame, A post-construction anchor is provided to be fixed to the existing frame, and a fixing member has a main reinforcement intersection portion that intersects with the main reinforcement, A reinforcing device for existing structural frames, characterized by comprising the following features.

2. In the reinforcing device for an existing frame according to claim 1, The fixing member is formed in a U-shape by a horizontal section that serves as the intersection of the main reinforcing bars and vertical sections provided on each side of the horizontal section, and the post-installed anchors are provided at the lower ends of each of the vertical sections, characterized in that the post-installed anchors are provided.

3. In the reinforcing device for an existing frame according to claim 1, The fixing member is formed in an L-shape by a horizontal portion that serves as the intersection of the main reinforcing bars and a vertical portion provided on one side of the horizontal portion, and the post-installed anchor is provided at the lower end of the vertical portion, characterized in that it is a reinforcing device for an existing slope frame.

4. In the reinforcing device for an existing frame according to claim 1, The fixing member is formed in an M shape by a V-shaped portion and vertical portions provided on both sides of the V-shaped portion, the V-shaped curved portion that forms the boundary between the V-shaped portion and the vertical portion becomes the main reinforcement intersection, and the post-installed anchors are provided at the lower ends of each of the vertical portions, characterized in that the reinforcing device for existing slope frames.

5. In the reinforcing device for an existing frame according to claim 1, The aforementioned spacing-holding member is provided with fixing pins that are driven into the slope via pin support portions, thereby reinforcing the existing slope frame.

6. In the reinforcing device for an existing frame according to claim 1, The reinforcing device for existing slope frames is characterized in that each pair of wire meshes is provided with a wire mesh notch, which is cut out of the wire mesh to avoid existing slope frames that intersect with the pair of wire meshes.

7. First, the main reinforcing bars constituting the reinforcing device for existing slope frames described in any one of claims 1 to 6 are temporarily placed on the existing slope frame to be reinforced, in the longitudinal direction thereof, and passing through the intersection points of existing slope frames that intersect with the existing slope frame. Next, the fixing member is positioned at the intersection so that the intersection of the main reinforcing bars intersects the main reinforcing bars from above, and the fixing member is fixed at the intersection by fixing the post-installed anchors provided on the fixing member to the intersection. Next, the spacing member of the formwork for additional spraying is placed over the fixing member and the main reinforcement, and the wire mesh is installed on both sides of the existing slope frame, and the fixing member, the main reinforcement and the spacing member are fastened together with a binding member at the intersection, while the main reinforcement and the spacing member are fastened together with a binding member on the existing slope frame other than the intersection, A method for reinforcing an existing formwork, characterized by subsequently spraying mortar or concrete for additional spraying onto the existing formwork so that the fixing members, the main reinforcing bars, and the formwork for additional spraying are embedded.

8. First, install the pair of wire meshes that constitute the formwork for additional spraying of the reinforcing device for existing slope frames described in any one of claims 1 to 6 on both sides of the existing slope frame to be reinforced. Next, the main reinforcing bars are temporarily placed on the spacing member so as to pass through the intersection of the existing frame, and the fixing member is positioned on top of the main reinforcing bars at the intersection so as to intersect the main reinforcing bars at the intersection, and the fixing member is fixed to the intersection by fixing the post-installed anchor provided on the fixing member to the intersection, thereby fixing the fixing member to the intersection from above the main reinforcing bars and the spacing member. Next, at the intersection, the fixing member, the main reinforcing bar, and the spacing member are bound together with a binding member, while at the existing frame other than the intersection, the main reinforcing bar and the spacing member are bound together with a binding member. A method for reinforcing an existing formwork, characterized by subsequently spraying mortar or concrete for additional spraying onto the existing formwork so that the fixing members, the main reinforcing bars, and the formwork for additional spraying are embedded.

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