Reinforcement anchors

Abstract

We provide reinforcing anchors that enable smooth cutting and construction. [Solution] A reinforcing anchor comprising: a pressure-receiving plate 4 in contact with a wall surface 3a; a tension member 10 that penetrates the pressure-receiving plate 4 and is fixed to the ground G located on the back side of the wall surface 3a; a retaining member 13 fixed to the portion of the tension member 10 that protrudes from the pressure-receiving plate 4 and holds down the pressure-receiving plate 4; and a bearing plate 17 positioned between the pressure-receiving plate 4 and the retaining member 13, wherein the bearing plate 17 is cuttable.

Description

Technical Field

[0004] ,

[0005] , , , , , ,

[0001] The present invention relates to a reinforcing anchor attached to a wall surface of a ground, such as a shaft wall for shield excavation.

Background Art

[0002] Conventionally, in a shaft wall for shield tunneling adopted when constructing an underground tunnel or a main sewer pipe by the shield method, there is known a cutting wall formed of a resin that can be cut by a cutter of a shield tunneling machine. This shaft wall is formed of a cutting wall in which core materials made of a composite material obtained by reinforcing a hard urethane resin with glass long fibers are arranged.

[0003] In such a cutting wall for shield tunneling, as shown in Patent Document 1, there is known a reinforcing anchor that reinforces the cutting wall and suppresses the cutting wall from bending inward of the shaft due to earth and water pressure. Patent Document 1 discloses a reinforcing anchor that is fixed to the ground in a state where a predetermined tensile force is applied to the wall surface of a cutting wall by penetrating a tensile member through the cutting wall that can be cut by a shield tunneling machine. This reinforcing anchor includes a pressure receiving plate that contacts the wall surface, a tensile member that penetrates the pressure receiving plate and is fixed to the ground located on the back side of the wall surface, a pressing member that is fixed to a portion of the tensile member protruding from the pressure receiving plate and presses the pressure receiving plate, and a support plate that is disposed between the pressure receiving plate and the pressing member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] <However, with conventional reinforcing anchors as described above, there is a possibility that the bearing plates that detach from the reinforcing anchors may clog the mud discharge pipe of the shield drilling machine when the cutting wall is being cut by the shield drilling machine.

[0006] This invention has been made in view of these problems, and aims to provide a reinforcing anchor that enables smooth cutting work. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention proposes the following means. The reinforcing anchor according to the present invention comprises a pressure-receiving plate that contacts a wall surface, a tension member that penetrates the pressure-receiving plate and is fixed to the ground located on the back side of the wall surface, a pressing member fixed to a portion of the tension member that protrudes from the pressure-receiving plate and holds down the pressure-receiving plate, and a bearing plate disposed between the pressure-receiving plate and the pressing member, wherein the bearing plate is cuttable. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a reinforcing anchor that enables smooth cutting work. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side cross-sectional view showing the schematic configuration of a shaft equipped with a cutting wall according to the first embodiment of the present invention. [Figure 2] Figure 1 is a horizontal cross-sectional view of the shaft seen from above. [Figure 3] This is a front view of a cut wall reinforced with reinforcing anchors. [Figure 4] This is an enlarged front view of the reinforcing anchors installed in the cut wall. [Figure 5] Figure 4 is a horizontal cross-sectional view of the reinforcing anchor along line AA. [Figure 6] Figure 4 is a longitudinal cross-sectional view of the reinforcing anchor along the BB line. [Figure 7]It is a longitudinal sectional view of the reinforcing anchor taken along the C-C line shown in FIG. 4. [Figure 8] It is a figure corresponding to the sectional view taken along the D-D line of the reinforcing anchor shown in FIG. 7, and is a figure showing the first example of the fixing method. [Figure 9] It is a figure corresponding to the sectional view taken along the D-D line of the reinforcing anchor shown in FIG. 7, and is a figure showing the second example of the fixing method. [Figure 10] It is a figure corresponding to the sectional view taken along the D-D line of the reinforcing anchor shown in FIG. 7, and is a figure showing the third example of the fixing method. [Figure 11] It is a figure corresponding to the sectional view taken along the D-D line of the reinforcing anchor shown in FIG. 7, and is a figure showing the fourth example of the fixing method. [Figure 12] It is a perspective view showing an example of the size of the bearing plate. [Figure 13] It is a figure showing the slit portion of the bearing plate according to the second embodiment of the present invention. [Figure 14] It is a figure showing the slit portion in the first modified example of the bearing plate shown in FIG. 14. [Figure 15] It is a figure showing the dividing portion in the second modified example of the bearing plate shown in FIG. 14. [Figure 16] It is a figure showing the dividing portion in the third modified example of the bearing plate shown in FIG. 14.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, with reference to the drawings, a reinforcing anchor according to an embodiment of the present invention will be described.

[0011] (First Embodiment) The reinforcing anchor 1 according to the first embodiment will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 and 2, the reinforcing anchor 1 according to the present embodiment is installed on the cutting wall 3 in the shaft 30 that serves as the starting section of the shield tunneling machine 2 used, for example, in the tunneling work of a shield tunnel. The reinforcing anchor 1 is fixed to the ground G in a state where a predetermined tensile force or tension is applied through the cutting wall 3. The reinforcing anchor 1 is made of a material that can be cut by the shield tunneling machine 2.

[0012] The vertical shaft 30 is constructed underground as a launching base for the shield tunneling machine 2, has a rectangular shape in top view, and a wall made of reinforced concrete is constructed on the excavation surface dug down from the ground. The vertical shaft 30 is constructed to have dimensions that allow the shield tunneling machine 2 to be arranged therein in the tunneling direction and also allow the installation of the equipment necessary for launching.

[0013] Note that the vertical shaft 30 is not limited to having a rectangular shape in top view, and may be circular or the like, and can be constructed in an appropriate shape. The structure of the vertical shaft 30 is not limited to being made of reinforced concrete. The vertical shaft 30 may, for example, include a plurality of long H-shaped steels driven along its outer periphery as earth retaining structures and a wall filled with concrete or mortar between the H-shaped steels. Alternatively, the vertical shaft 30 may include a concrete wall sunk by a caisson or the like.

[0014] The shield tunneling machine 2 includes a chamber 22 and a cutter 21, and on the launching gantry 32 provided on the bottom plate of the vertical shaft 30, the cutter 21 is opposed to the face, that is, the wall surface 3a of the cutting wall 3. Moreover, the shield tunneling machine 2 is arranged with its central axis aligned with the tunnel central axis.

[0015] The cutting wall 3 is on the back side of the box-out portion 33 obtained by removing the launching area in the vertical shaft 30 constructed underground as the launching base of the shield tunneling machine 2, and is provided in the launching area to be cut by the shield tunneling machine 2. As shown in FIG. 3, the cutting wall 3 has a circular cross section with a diameter larger than the outer diameter of the shield tunneling machine 2 and is cut by the cutter 21 of the shield tunneling machine 2.

[0016] The cutting wall 3 can adopt a shield launching / arrival earth retaining wall such as, for example, a SEW wall (a wall constructed by the SEW (Shield Earth Retaining Wall System) method owned by Sekisui Chemical Co., Ltd.) formed from a composite material in which hard urethane resin is reinforced with glass long fibers, an H-shaped steel type FRP, or concrete reinforced with carbon fiber. Furthermore, the cut wall 3 is reinforced by multiple excavable reinforcing anchors 1 made of a composite material in which polyester resin is reinforced with glass fibers or carbon fibers.

[0017] As shown in Figure 3, the cutting wall 3 consists of multiple core materials 34 for forming cutting sections (hereinafter simply referred to as "core materials 34") extending vertically and arranged horizontally at predetermined intervals. Between the core materials 34, there are cement hardening sections 35 made only of soil cement hardened material. The core material 34 has a columnar composite material 34a made of rigid urethane resin reinforced with glass long fibers, which is a material that can be cut by the cutter 21 of the shield drilling machine 2. The columnar composite material 34a is not particularly limited depending on the ground conditions and size of the shaft at the construction site, but for example it is made of 600 x 300 mm Eslon Neo Lumber FFU manufactured by Sekisui Chemical Co., Ltd. Furthermore, H-shaped steel 34b is fixed to the top and bottom of the columnar composite material 34a of the core material 34a via joints and bolts and nuts. In the core material 34 shown in Figure 3, the columnar composite material 34a is arranged within the cutting wall 3 indicated by the dashed line.

[0018] Next, the reinforcing anchor 1 will be explained with reference to Figures 4 to 7. The reinforcing anchor 1 includes a pressure plate 4, an anchor material 11 (tension material 10), a grip member 12 (tension material 10), a pressing member 13, and a bearing plate 17.

[0019] The anchor material 11 extends diagonally downward into the ground G from inside the shaft 30, penetrating the pressure plate 4 and the cut wall 3. The upper protruding end 11a of the anchor material 11 protrudes outward from the cut wall 3, and the lower anchoring end 11b extends into the ground G and is anchored by an anchoring material. The grip member 12 is integrally fitted onto the protruding end 11a of the anchor material 11 with a frictional force exceeding the tensile force, and has a threaded portion 12a (see Figure 7) on its outer surface. Here, the anchor member 11 and the grip member 12 constitute the tension member 10. The tension member 10 penetrates the pressure plate 4. The tension member 10 is anchored to the ground G. The ground G is located on the back side of the wall surface 3a relative to the pressure plate 4. The retaining member 13 is fixed to the portion protruding from the pressure receiving plate 4 and holds down the pressure receiving plate 4. For example, a nut 25 may be used as the retaining member 13. The retaining member 13 is tightened into the threaded portion 12a of the grip member 12, pressing the pressure receiving plate 4 against the cutting wall 3 and creating a contact. Here, the bearing plate 17 is positioned between the pressure receiving plate 4 and the retaining member 13.

[0020] The pressure plate 4 is fitted to the outside of the grip member 12 and presses against the wall surface 3a of the cutting wall 3. The pressure plate 4 is made of a cuttable material such as FRP. The pressure plate 4 has a pressure plate body 40, a laminated plate 41 that is pressed against the wall surface 3a of the cutting wall 3, and a plate-shaped anti-slip member 42 provided between the pressure plate body 40 and the laminated plate 41. The laminated plate 41 is laminated with the anti-slip member 42 and formed as a single unit. The integrated two-layer structure of the laminated plate 41 and the anti-slip member 42 constitutes the overlapping plate section 43.

[0021] As shown in Figure 7, the pressure plate body 40 has a through hole 40a through which the grip member 12 can be inserted. The inner diameter of the through hole 40a is approximately the same as the outer diameter of the grip member 12. The pressure plate body 40 has a first end face 40b that contacts the wall surface 3a via the anti-slip member 42 and the laminated plate 41 in the direction of the through hole 40a, which intersects diagonally with the direction of the hole axis, and a second end face 40c on the side of the pressing member 13 in the direction of the hole axis, which is a plane perpendicular to the direction of the hole axis. The first end face 40b and the second end face 40c are each formed in a rectangular shape, for example, when viewed from a direction perpendicular to the plane direction.

[0022] The laminated boards 41 and anti-slip members 42 are each plate-shaped, with through holes 41a and 42a formed in the center through which the grip member 12 can be inserted. When the anti-slip member 42 is fitted onto the grip member 12, one first plate surface 42b abuts against the first end surface 40b of the pressure receiving plate body 40, and the other second plate surface 42c abuts against the first plate surface 41b of the laminated board 41. When the laminated board 41 is fitted onto the grip member 12, the other second plate surface 41c, opposite the first plate surface 41b, abuts against the side surface of the core material 34 on the wall surface 3a of the cut wall 3 (see Figure 5).

[0023] In Figures 4 and 7, the laminated plate 41 and the anti-slip member 42 extend upward from the first end face 40b of the pressure plate body 40, forming a rectangular plate shape, and are fixed to the wall surface 3a of the cutting wall 3 by cuttable bolts 51 (fixing members). The laminated plate 41 and the anti-slip member 42 are fixed and supported at the left and right portions to two adjacent columnar composite materials 34a of core material 34, respectively, by bolts 51.

[0024] The laminated plate 41 and anti-slip member 42 of the pressure receiving plate 4 have two sets of bolt insertion holes 52, 52 (through holes) on both the left and right sides, which penetrate in the thickness direction and have a diameter through which bolts 51 can be inserted (see Figure 4). The two sets of bolt insertion holes 52, 52 are arranged in pairs, spaced apart in the vertical direction, at positions that overlap the columnar composite material 34a of the two core materials 34 when viewed from the inside of the shaft. The bolts 51 inserted into each of the two sets of bolt insertion holes 52, 52 are driven towards the columnar composite material 34a of the core material 34 of the cut wall 3.

[0025] As shown in Figures 6 and 7, in the overlapping plate section 43, a filler material 53 such as adhesive 20 or a filling resin is filled between the bolt insertion hole 52 and the bolt hole 36 drilled in the core material 34 and the bolt 51. In other words, the bolt 51 is fixed so as to straddle the bolt insertion hole 52 and the bolt hole 36 which penetrates the core material 34 of the cut wall 3. Here, the bolt 51 is made of a cuttable material such as FRP.

[0026] As shown in Figures 1 and 7, the anchor material 11 functions as a tension member 10 made of machinable carbon fiber strands. The anchor material 11 is inserted into an anchor fixing hole 31 drilled from the wall surface 3a side of the cutting wall 3 to the ground G on the back side, and the anchoring end 11b at the lower end is fixed in the ground G by grout 16 filled in the anchor fixing hole 31. The anchor material 11 can be subjected to tensile tension that presses against the wall surface 3a of the cutting wall 3 via the pressure receiving plate 4 with a force that can withstand earth pressure and water pressure. The anchor material 11, excluding the protruding ends 11a and the anchored ends 11b at both ends, has its longitudinal middle portion inserted into a sheath pipe 15 such as a corrugated rigid polyethylene pipe, as shown in Figure 7, and is in a non-anchored state with respect to the grout 16 that fills the anchor fixing hole 31.

[0027] As shown in Figures 6 and 7, the grip member 12 can be a so-called tendon grip and is integrally attached to the protruding end 11a of the anchor material 11 via the fixing expansion mortar 14. The grip member 12 is formed from a machinable material such as FRP, and its outer surface is threaded so that the retaining member 13 can be screwed onto it. With the pressure plate 4 and the retaining member 13 attached, the fixing expansive mortar 14 is injected between the grip member 12 and the protruding end 11a of the anchor material 11, and hardens in an expanded state. As the fixing expansive mortar 14 hardens, it expands, causing the protruding end 11a of the anchor material 11 and the grip member 12 to come into close contact as a single unit, and consequently the grip member 12 is fixed to the pressure plate 4 by frictional force. Note that the fixing expansive mortar 14 can be a known type used in general anchoring methods.

[0028] The retaining member 13 is made of a machinable material such as FRP. The retaining member 13 may be, for example, a nut 25, which can be screwed onto the threaded portion 12a on the outer surface of the grip member 12 as described above. By tightening the retaining member 13, the pressure receiving plate 4 can be pressed against the wall surface 3a of the cutting wall 3 in the direction of the tension axis O. In other words, the pressure receiving plate 4 is clamped between the cutting wall 3 and the retaining member 13 by tightening the retaining member 13.

[0029] In the reinforcing anchor 1 according to this embodiment, the pressure plate 4 is pressed against the wall surface 3a of the cutting wall 3 by a retaining member 13 that is tightened onto a grip member 12 fixed to the protruding end 11a of the anchor material 11 when tension is applied, thereby restraining it. This allows the anchor force to be transmitted from the pressure plate 4 to the cutting wall 3, and the anchor force is applied to the reinforcing anchor 1, thereby reinforcing the cutting wall 3. Since the cut wall 3, constructed in this manner, is reinforced by multiple reinforcing anchors 1, it is possible to prevent the cut wall 3 from bending inward into the shaft 30 due to soil and water pressure.

[0030] The bearing plate 17 is cuttable. This means that when the wall surface 3a is cut by the shield drilling machine 2, the bearing plate 17 is also cut. This prevents the bearing plate 17 from clogging the sludge discharge pipe of the shield drilling machine 2.

[0031] As mentioned above, the bearing plate 17 is positioned between the pressure receiving plate 4 and the pressing member 13. The bearing plate 17 is made of, for example, fiber-reinforced resin. The fiber material may be, for example, glass, carbon fiber, aramid fiber, or basalt fiber. The resin material may be, for example, epoxy resin, unsaturated polyester, vinyl ester, or urethane. By making the bearing plate 17 of fiber-reinforced resin, the strength of the bearing plate 17 is increased while making it easier to cut the bearing plate 17.

[0032] The bearing plate 17 has fiber directions in at least two mutually orthogonal directions in the in-plane direction of the bearing plate 17. As a result, the load from the pressing member 13 is distributed across the entire surface of the bearing plate 17 based on the orientation of the fibers of the bearing plate 17. In this embodiment, the bearing plate 17 is rectangular in plan view, and the two mutually orthogonal fiber directions coincide with two directions parallel to the two mutually orthogonal sides in the rectangular shape formed by the bearing plate 17.

[0033] The pressure receiving plate 4 and the bearing plate 17 are fixed together by a method described later. This prevents the bearing plate 17 from coming off the pressure receiving plate 4 during cutting. The following explains the specific methods of securing the device.

[0034] As shown in Figure 8, the bearing plate 17 may be fitted to the pressure receiving plate 4 in at least a portion thereof. The bearing plate 17 may be made of fiber-reinforced resin and may have bearing plate protrusions 19, such as groove-shaped or mountain-shaped protrusions. In the illustrated example, the bearing plate protrusions 19 are provided on the outer edge of the bearing plate 17. The bearing plate protrusions 19 are annular in plan view of the bearing plate 17. The height of the bearing plate protrusions 19 may be greater than, less than, or equal to the thickness of the bearing plate 17. The pressure receiving plate 4 may also be provided with a pressure receiving plate recess 5 in the thickness direction into which the bearing plate protrusions 19 of the bearing plate 17 can be fitted. This makes it possible to fit the bearing plate protrusions 19 of the bearing plate 17 into the pressure receiving plate recess 5 provided in the pressure receiving plate 4 and fix the bearing plate 17 and the pressure receiving plate 4 with a simple structure. Furthermore, in the illustrated example, the pressure-receiving plate 4 and the bearing plate 17 are fixed together with adhesive 20. This ensures that the pressure-receiving plate 4 and the bearing plate 17 are securely fixed together. The adhesive 20 is arranged in layers between the pressure-receiving plate 4 and the bearing plate 17. In the illustrated example, the adhesive 20 is applied over the entire surface of the bearing plate 17. In the example shown in Figure 8, the bearing plate 17 is provided with a bearing plate projection 19, which fits into the pressure receiving plate recess 5. However, as shown in Figure 11, the entire bearing plate 17 may also fit into the pressure receiving plate recess 5.

[0035] As shown in Figure 9, the bearing plate 17 may be fixed to the pressure receiving plate 4 by fasteners 23. For example, chemical anchors (registered trademark) or bolts made of fiber-reinforced resin can be used as fasteners 23. The bearing plate 17 and the pressure receiving plate 4 are provided with fastener insertion holes 24 in the thickness direction through which chemical anchors (registered trademark) or bolts can be inserted. Below, the construction method will be described using the case in which chemical anchors (registered trademark) are used as fasteners 23 as an example. For example, the installer first drills a fixing device insertion hole 24 through which a chemical anchor (registered trademark) can be inserted into the pressure-receiving plate 4 and the bearing plate 17, which are integrally held down by the retaining member 13. At this time, the fixing device insertion hole 24 penetrates the bearing plate 17 and reaches the pressure-receiving plate 4. Next, the chemical anchor (registered trademark) is inserted through the fixing device insertion hole 24 formed in the pressure-receiving plate 4 and the bearing plate 17, and the protruding end of the chemical anchor (registered trademark) protruding from the bearing plate 17 is tightened with a fiber-reinforced resin nut 25 or the like. In this way, the bearing plate 17 and the pressure-receiving plate 4 can be fixed together. However, the fixing of the bearing plate 17 with the fixing device may be performed before the bearing plate 17 is held down by the retaining member 13.

[0036] As long as the bearing plate 17 and the pressure-receiving plate 4 are fixed together, the type and number of fasteners 23 are not particularly limited. For example, two fasteners 23 may be used on the left and right sides of the bearing plate 17 and the pressure-receiving plate 4, sandwiching the retaining member 13, which is the insertion point for the grip member 12. More than two fasteners 23 may be used as appropriate to provide a more secure fixation. There may also be just one fastener 23.

[0037] The method of fixing the bearing plate 17 and the pressure receiving plate 4 is not limited to the above. For example, as shown in Figure 10, the surfaces of the bearing plate 17 and the pressure receiving plate 4 that come into contact with each other may be roughened with sandpaper or the like. This increases the friction at the contact surface between the bearing plate 17 and the pressure receiving plate 4, which increases the adhesive strength of the adhesive 20 and prevents the bearing plate 17 from coming off the pressure receiving plate 4. However, even when using adhesive 20, roughening of the surfaces is not required.

[0038] In all of the above fixing methods, adhesive 20 is not required between the pressure receiving plate 4 and the bearing plate 17.

[0039] As shown in Figure 12, an example of the dimensions of the bearing plate 17 is, for example, a length x of 30 cm, a width y of 30 cm, and a thickness z of 3 cm. The bearing plate 17 has a grip member insertion hole 18 through which the grip member 12 can be inserted. The diameter of the grip member insertion hole 18 is, for example, 12 cm. Here, the surface of the bearing plate 17 that contacts the tension member 10 may be the top surface, and the surface that contacts the pressure receiving plate 4 may be the bottom surface.

[0040] As described above, according to the reinforcing anchor 1 of this embodiment, the bearing plate 17 is cuttable and is made of, for example, fiber-reinforced resin. Therefore, since the bearing plate 17 is cut by the shield drilling machine 2, clogging of the mud discharge pipe of the shield drilling machine 2 can be suppressed.

[0041] Furthermore, in this embodiment, as shown in Figures 8 to 11, the bearing plate 17 and the pressure receiving plate 4 are fixed together. This prevents the bearing plate 17 from coming off the pressure receiving plate 4 during construction.

[0042] (Second Embodiment) Next, a bearing plate 17 according to a second embodiment of the present invention will be described with reference to Figures 13 to 16. In this second embodiment, the same reference numerals are used for parts that are the same as those in the first embodiment, and their descriptions are omitted. Only the differences will be described.

[0043] In the second embodiment, in order to prevent the bearing plate 17 from getting stuck in the shield excavator 2 during cutting work, slits 26 may be provided in the bearing plate 17 that divide it into sizes that prevent it from getting stuck in the mud discharge pipe. In the following section, the bearing plates 17 equipped with the slits 26 will be referred to as bearing plates 17a and 17b, and the specific method of creating the slits 26 will be described. It is assumed that the size of the bearing plate 17 is the size described in Figure 12 above, but this embodiment is not limited to this.

[0044] As shown in Figure 13, the bearing plate 17a may be provided with slits 26 spaced, for example, about 10 mm apart from the edges of the grip member insertion holes 18 formed on the top and bottom surfaces. In this case, it is desirable that the slits 26 be arranged in four places so as to divide the bearing plate 17a into four sections of 15 cm in length and 15 cm in width. In the illustrated example, the slits 26 penetrate the bearing plate 17 in the thickness direction. In other words, the bearing plate 17a is provided with slits 26 that divide the bearing plate 17a into four sections, with only the area around the grip member insertion hole 18, which receives the load from the retaining member 13, remaining connected. This prevents the bearing plate 17a from being damaged by the load received from the retaining member 13.

[0045] As shown in Figure 14, the bearing plate 17b may be provided with slits 26 at a distance of approximately 5 mm from the bottom surface in the thickness direction (not penetrating in the thickness direction). In this case, it is desirable that the slits 26 be arranged in four places so as to divide the bearing plate 17b into four sections of 15 cm in length and 15 cm in width. In this case, the slits 26 may be provided along the entire length of the bearing plate 17 from the outer edge to the inner edge (edge ​​of the grip member insertion hole 18). In other words, the bearing plate 17b is provided with slits 26 such that the bearing plate 17b is divided into four parts, with only the bottom surface, which receives a load from the retaining member 13 and generates bending stress, remaining connected. This prevents the bearing plate 17b from being damaged by the bending stress received from the retaining member 13.

[0046] When providing slits 26 in the bearing plate 17, it is sufficient to provide slits 26 of a size that will not clog the mud discharge pipe of the shield excavator 2 during cutting work, and the arrangement and method of providing the slits 26 are not limited to the two methods described above. By creating slits 26 in the bearing plate 17, the bearing plates 17a and 17b are divided into sizes that do not clog the mud discharge pipe of the shield excavator 2 during cutting work. This facilitates discharge from the mud discharge pipe of the shield excavator 2 and prevents the bearing plates 17a and 17b from clogging the shield excavator 2.

[0047] Furthermore, in order to prevent the bearing plate 17 from getting stuck in the shield drilling machine 2 during cutting work, in addition to using bearing plates 17a and 17b, the bearing plate 17 may be divided into appropriate sizes in advance, and the plate pieces 27 may be temporarily fixed with adhesive 20 and used as a single bearing plate 17. In the following sections, the bearing plates 17 that are temporarily fixed with adhesive 20 will be referred to as bearing plates 17c and 17d, and the specific method of temporary fixing will be explained.

[0048] As shown in Figure 15, the bearing plate 17 is divided into four sections beforehand, each measuring 15 cm in length and 15 cm in width, and each section is made into a plate piece 27. The four plate pieces 27 are temporarily fixed together with adhesive 20 to form a single bearing plate 17c. This allows the bearing plate 17c to be easily divided during the cutting process.

[0049] Furthermore, as shown in Figure 16, the two bearing plates 17 are divided at different positions in advance so that they do not clog the mud discharge pipe of the shield excavator 2. The four divided plate pieces 27 are temporarily fixed together with adhesive 20 to form bearing plates 17e and 17f. Then, bearing plates 17e and 17f are stacked so that the division positions do not overlap to form bearing plate 17d. By stacking the two bearing plates 17 so that their division points do not overlap, damage to the bearing plate 17d due to the load received from the pressing member 13 is suppressed, while the bearing plate 17d can be easily divided during cutting.

[0050] When dividing the bearing plate 17 in advance, it is sufficient to divide it into sizes that do not clog the mud discharge pipe of the shield excavator 2 during cutting work, and the division method is not limited to the two methods described above. By using bearing plates 17c and 17d, the bearing plates 17c and 17d are divided into sizes that do not clog the mud discharge pipe of the shield excavator 2 during cutting work, making it easier to discharge them from the mud discharge pipe of the shield excavator 2 and preventing the bearing plates 17c and 17d from clogging the shield excavator 2.

[0051] As described above, according to the reinforcing anchor 1 of this embodiment, the bearing plate 17 is easily divided during cutting, making it easier to discharge the sludge from the mud discharge pipe of the shield excavator 2.

[0052] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0053] For example, in this embodiment, the cutting wall 3 on which the reinforcing anchor 1 is provided is the shaft of the launch base for the shield drilling machine, but it is not limited to this. For example, it may be provided on the cutting wall 3 of the shaft that serves as the arrival base for the shield drilling machine 2. Furthermore, it may be provided on the cutting wall 3 of the shaft used to change the direction of the shield drilling machine 2 and launch it from this arrival base.

[0054] Furthermore, it is possible to replace the components in the above embodiments with well-known components as appropriate, without departing from the spirit of the present invention.

[0055] (Note) The above embodiment can be understood, for example, as follows:

[0056] <1> A reinforcing anchor according to one aspect of the present disclosure comprises a pressure-receiving plate in contact with a wall surface, a tension member that penetrates the pressure-receiving plate and is fixed to the ground located on the back side of the wall surface, a pressing member fixed to a portion of the tension member that protrudes from the pressure-receiving plate and presses against the pressure-receiving plate, and a bearing plate disposed between the pressure-receiving plate and the pressing member, wherein the bearing plate is cuttable.

[0057] The bearing plates are cuttable. Therefore, when the wall surface is cut with a shield drilling machine, the bearing plates are also cut. This prevents, for example, the bearing plates from clogging the mud discharge pipe of the shield drilling machine. As a result, smooth cutting work can be achieved.

[0058] <2> the above <1> The reinforcing anchors relating to this may have bearing plates made of fiber-reinforced resin.

[0059] The bearing plate is made of fiber-reinforced resin. Therefore, the strength of the bearing plate is increased while making it easier to cut.

[0060] <3> the above <2> The reinforcing anchors relating to this may have fiber directions in at least two mutually orthogonal directions in the in-plane direction of the bearing plate.

[0061] The bearing plate has fiber directions in at least two mutually orthogonal directions within its in-plane orientation. This makes it possible to distribute the force received from the pressing member across the entire surface of the bearing plate based on the orientation of the fibers.

[0062] <4> the above <1> ~ <3> In any one embodiment of the reinforcing anchor, the pressure-receiving plate and the bearing plate may be fixed together.

[0063] The pressure-receiving plate and the bearing plate are fixed together. This makes it less likely for the bearing plate to detach from the reinforcing anchor when the cutting wall is cut with a shield drilling machine. Therefore, the bearing plate is cut reliably.

[0064] <5> the above <4> The reinforcing anchors relating to the bearing plate may have at least a portion of the bearing plate fitted to the bearing plate.

[0065] At least a portion of the bearing plate is fitted into the pressure-receiving plate. Therefore, the pressure-receiving plate and the bearing plate can be fixed together with a simple structure.

[0066] <6> the above <4> or <5> In the case of the reinforcing anchor, the bearing plate may be fixed to the pressure-receiving plate by a fastener.

[0067] The bearing plate is fixed to the pressure-receiving plate by a fixing device. This allows the pressure-receiving plate and the bearing plate to be firmly fixed together.

[0068] <7> the above <4> ~ <6> In any one embodiment of the reinforcing anchor, the pressure receiving plate and the bearing plate may be fixed together with an adhesive.

[0069] The pressure-receiving plate and the bearing plate are fixed together with adhesive. This ensures that the pressure-receiving plate and the bearing plate are securely fixed together.

[0070] <8> the above <1> ~ <7> In a reinforcing anchor according to any one embodiment, the pressure receiving plate is characterized by comprising a pressure receiving plate body in contact with the bearing plate, a laminated plate disposed between the pressure receiving plate body and the wall surface, and an anti-slip member fixed to the side of the laminated plate opposite to the wall surface.

[0071] The pressure plate has an anti-slip member fixed to the side of the laminated board opposite to the wall surface. This suppresses slippage between the pressure plate body and the wall surface during tension fixing, making it possible to reliably drive the tension member into the predetermined position. [Explanation of symbols]

[0072] 1. Reinforcement anchor 2 Shield drilling machine 3 cutting wall 3a Wall surface 4 Pressure plate 5 Pressure plate recess 10. Tension members 11 Anchor material 12 Grip component 13 Retaining member 14. Expanding mortar for fixing 17 Bearing plate 18. Through hole for grip member 19. Bearing plate protrusion 20 Adhesives 23 Fixtures 24 Fastener insertion holes 25 nuts 26 slits 27 Board piece 30 vertical shafts 31 Anchor fixing holes 36 bolt holes 40 Pressure plate body 41 Laminate 42 Anti-slip material 43 Overlapping plate section 51 volts 52 Bolt insertion holes 53 Filling material G Ground O Tension shaft

Claims

1. A pressure-receiving plate that is in contact with the wall, A tension member that penetrates the pressure-receiving plate and is anchored to the ground located on the back side of the wall surface, A pressing member is fixed to the portion of the tension member that protrudes from the pressure plate and presses against the pressure plate, A bearing plate is positioned between the pressure receiving plate and the pressing member, Equipped with, The bearing plate is cuttable. A reinforcing anchor characterized by the following features.

2. The reinforcing anchor according to claim 1, characterized in that the bearing plate is made of fiber-reinforced resin.

3. The reinforcing anchor according to claim 2, characterized in that the bearing plate has fiber directions in at least two mutually orthogonal directions in the in-plane direction of the bearing plate.

4. The reinforcing anchor according to claim 1, characterized in that the pressure receiving plate and the bearing plate are fixed together.

5. The reinforcing anchor according to claim 4, characterized in that at least a portion of the bearing plate is fitted to the pressure receiving plate.

6. The reinforcing anchor according to claim 4, characterized in that the bearing plate is fixed to the pressure receiving plate by a fixing device.

7. The reinforcing anchor according to claim 4, characterized in that the pressure receiving plate and the bearing plate are fixed together with an adhesive.

8. The pressure receiving plate is The pressure receiving plate body that contacts the aforementioned bearing plate, A laminated plate is disposed between the pressure receiving plate body and the wall surface, A reinforcing anchor according to any one of claims 1 to 7, characterized by having an anti-slip member fixed to the surface of the laminated board opposite to the wall surface.

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