PC steel anchoring device and anchoring method

Abstract

In confined workspaces, when PC steel is tensioned after the anchoring device has been embedded in concrete, the PC steel is tensioned accurately and reliably. [Solution] The anchoring device includes a bearing plate provided on the end face of the concrete structure, a sleeve connected to the anchoring device side of the bearing plate, and a wedge enclosed within the sleeve. The sleeve is configured to be connectable to the bearing plate via a connecting jig provided on the anchoring device side of the bearing plate, and the connecting jig is a hollow cylindrical body 1112 provided perpendicular to the bearing plate body 1118 on the anchoring device side of the bearing plate portion 1110, with a female thread 1116 on the inner circumference of the hollow cylindrical body 1112. The sleeve 1150 is connected to the bearing plate body 1118 by screwing the female thread 1116 and a male thread 1150M provided on the outer circumference of the sleeve 1150 together.

Description

Technical Field

[0001] The present invention relates to a fixture used when prestress is applied to a concrete body (concrete structure) by a post-tensioning method, and is a fixture for fixing PC steel materials on the fixed side by a wedge method when tensioning the concrete body in a narrow space by single-sided pulling. When the PC steel material is tensioned after the fixture is embedded in concrete, the present invention relates to a fixture and a fixing method that can be suitably used even in a narrow working space. In the present invention, the PC steel materials include PC steel wires, PC steel bars, PC steel stranded wires (PC steel twisted wires), and PC steel materials whose outer surfaces are coated (coated) with resin (such as epoxy), and also include their deformed types.

Background Art

[0002] Structures in which PC steel materials, which are tension members, are arranged in a concrete body and prestress is introduced by fixing them to the concrete body in a state where tensile force is introduced are widely used. Most of these PC steel materials are inserted into a sheath embedded in the concrete body and integrated with the concrete body (concrete structure) by the adhesive force of the grout that is applied and cured after the tensile force is introduced.

[0003] In some cases, construction work such as replacing a structure (for example, a floor slab in a highway bridge) in which prestress is introduced by such PC steel materials, or construction work such as adding a structure (floor slab) to widen a lane may be required. In such cases, recently, a plurality of precast PC floor slabs are arranged side by side, PC steel materials are arranged in a direction perpendicular to the vehicle traveling direction, the PC steel materials are tensioned, and prestress is introduced so that the plurality of precast PC floor slabs are integrated. Referring to FIG. 1, this floor slab replacement (renewal) work will be described. The present invention is not limited to precast concrete bodies in which concrete is cast into a formwork in a precast concrete factory and is applicable.

[0004] The schematic diagram shown in Figure 1 illustrates a scenario where the bridge deck is replaced on a single lane (two lanes for uphill traffic, or two lanes for downhill traffic) on a bridge such as a two-lane expressway or motorway. It should be noted that construction is also beginning to be carried out on one lane while keeping at least one lane open to traffic, rather than completely closing the entire lane. This avoids the need for two-way traffic using two lanes in each direction.

[0005] As shown in Figure 1(A), when making one lane of a single-lane road passable, the existing deck is removed, and then multiple (two in this case) precast PC deck slabs 10, which are divided in the cross-sectional direction, are placed (with bearing plates 20 embedded on the fixed side), and PC steel members 200 are inserted into the sheath 30 from the tension side. Note that the PC deck slab 11 is the same material as the PC deck slab 10 (except that bearing plates 20 are not embedded at the ends in this figure), and is a material that has already been replaced and put into service. Furthermore, although the parapet 51 on the tensioned side is a component that has already been replaced, the working space on the tensioned side of the parapet 51 is larger (than the working space on the fixed side), and regardless of whether the PC steel members 10 are inserted into the sheath 30, the concrete is embedded in the working space 40, or the PC steel members 200 are tensioned, work related to the tensioning of the PC steel members 200, including the installation of a new parapet 51 for replacement, can be carried out from the end face side (provided there is scaffolding) (on the fixed side, work may have to be carried out from the bridge deck, as will be described later).

[0006] Next, as shown in Figure 1(B), a fixing device 42 (sometimes called a dead anchor because the working space 40 will be later embedded in concrete) is set on the fixed bearing plate 20 in the working space 40. As such, the available working space is considerably narrow due to the presence of the adjacent bridge (opposing lane). Furthermore, due to the narrowness of this available working space, it is not practical to insert the PC steel material into the sheath 30 from this available working space (fixed side). Note that the explanation of the process of filling the sheath 30 with grout is omitted here. Furthermore, although a dead anchor (including the bearing plate 20 embedded in the deck slab 10) is used as the anchoring device 42 here, if a normal anchoring device (a so-called wedge-type (grip-type) anchoring device consisting of a combination of a sleeve and a wedge) is used (because the working space on the fixed side is narrow, making it very difficult to install the grip from the end face), it is difficult to install the wall parapet 52 on the fixed side on the deck slab 10 until the grip is installed, the PC steel is tensioned and the notched portion is filled with concrete, in order to cut a notch in the deck slab and work from the bridge deck (if the problems described later are solved and dead anchors can be used, it will be possible to install the wall parapet 52 even before tensioning the PC steel 200).

[0007] Next, as shown in Figure 1(C), the fixed-side bearing plate 20 with the anchoring device 42 set in it, and the working space 40 including the anchoring device 42 are embedded in concrete, and then the fixed-side wall parapet 52 is installed on top of the concrete-embedded working space 40. Here, regarding the wall parapet, on the tensioning side, it can be installed from the end face regardless of whether the PC steel is inserted or not, whether tensioning is performed or whether the working space 40 is embedded in concrete, whereas on the fixed side, if a dead anchor is not used (because the working space on the fixed-side bridge deck is narrow and work is performed from the bridge deck by cutting out a part of the deck slab), it is impossible to install the wall parapet 52 until the grips are installed, the PC steel is tensioned and the cut-out portion is embedded in concrete, which may delay the process of installing a new replacement wall parapet 52 on the fixed side.

[0008] Next, as shown in Figure 1(D), the PC steel members 200 are tensioned using a hydraulic jack 60 on the tensioning side to introduce prestress into multiple precast PC slabs and integrate them into a single unit.

[0009] In such deck replacement work, the fixed working space 40 is (1) often narrow due to the presence of adjacent bridges, and may even be extremely narrow; (2) when setting the anchoring device 42 on the bearing plate 20 in the working space 40, tension is not applied to the PC steel 200, so (2-1) even if the bearing plate 20 and the sleeve of the anchoring device 42 are in contact, they are not integrated and may shift; (2-2) the wedge may shift from the sleeve (tension is applied to the PC steel 200 only after the working space 40, including the fixed bearing plate 20 and anchoring device 42, is embedded in concrete); and (3) because the working space 40 is embedded in concrete without tension, the watertightness of the anchoring device (covered cylindrical parts called sleeves, wedges, and caps) may be insufficient, and slurry (a mixture of water and concrete (cement paste), which becomes mortar when sand is added and concrete when gravel is added) may seep into the anchoring device, making it impossible to apply the desired tension. Furthermore, as mentioned above, if dead anchors are not used for the fixing device 42 on the fixed side, there is a problem that the process of installing the new replacement wall railing 52 on the fixed side may be delayed.

[0010] To address these problems, Japanese Patent Publication No. 2006-219912 (Patent Document 1) discloses a fixing structure for PC steel strands and sockets in which, when constructing a PC structure, a wedge is pressed between the inner wall of a tapered hole in the PC steel strand and the socket (same as a sleeve) in order to fix a socket that forms part of a fixing device to the end of the PC steel strand, which is a tensioning material, and the fixing of the PC steel strand and the socket is firmly maintained without loosening even after the pressing force is removed.

[0011] This fastening structure is a fastening structure for a PC steel strand 1 and a socket 2, wherein a socket 2 is attached to the end of a PC steel strand 1 used as a tensioning member for a PC structure, and a wedge 3 is press-fitted between a tapered hole provided on the inner surface of the socket 2 and the PC steel strand 1 inserted through the tapered hole to fasten the socket 2, and is characterized by comprising the PC steel strand 1, the socket 2, a wedge 3 press-fitted between the two, and a pressure-retaining cap 9 screwed onto the rear end of the socket 2 for retaining the pressing force applied to the wedge 3.

[0012] As an embodiment 2, a dead anchor is shown in Figure 3, disclosing a fixing structure equipped with a pressure-holding cap that screws onto the male threaded portion on the outer circumference of the socket. The dead anchor B is inserted into a hole excavated in the ground or provided in a concrete structure, and then embedded and fixed in the ground or within the concrete structure with concrete to function as a fixing body for the PC cable. When the PC steel strand 1 is tensioned, a bearing plate 6 is attached to the socket 2 in advance by tap bolts 12 so that the tensioning force is applied to the concrete structure. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 2006-219912 [Overview of the Initiative] [Problems that the invention aims to solve]

[0014] However, in the dead anchor fixing structure of Embodiment 2 disclosed in Patent Document 1, although the bearing plate 6 is attached to the socket 2 by tap bolts 12, the tap bolts 12 are attached from the tension side opposite to the anchoring device (socket 2, wedge 3) of the bearing plate 6. This presents a critical problem: in precast concrete structures as shown in Figure 1, or in concrete structures where concrete has been poured on site, it is impossible to attach the bearing plate with tap bolts because concrete is present on the opposite side of the anchoring device of the bearing plate.

[0015] The present invention was developed in view of the above-mentioned problems of the prior art, and its purpose is to provide an anchoring device and anchoring method for use when applying prestress to a concrete structure (including precast concrete) by a post-tensioning method, which anchors a PC steel material in a wedge manner on the fixed side when tensioning the concrete structure by one-sided tensioning, and which can be suitably used even in a confined workspace when the PC steel material is tensioned after the anchoring device is embedded in concrete, thereby suppressing delays in the process. [Means for solving the problem]

[0016] To achieve the above objective, the PC steel anchoring device relating to the curved surface of the present invention comprises the following technical means.

[0017] In other words, a PC steel connector according to a certain aspect of the present invention is a PC steel connector for fixing a PC steel member in a wedge manner on the fixed side when introducing prestress to a concrete structure by single-sided pulling, wherein the PC steel member is tensioned after the connector is embedded in concrete, and comprises a bearing plate provided on the end face of the concrete structure, a sleeve connected to the connector side of the bearing plate, and a wedge enclosed within the sleeve, wherein the sleeve is configured to be connectable in a state of contact with the bearing plate via a connecting jig provided on the connector side of the bearing plate.

[0018] Preferably, the outer circumferential surface of the sleeve is provided with male threads, and the connecting jig is a hollow cylindrical body provided perpendicular to the bearing plate on the fixing side of the bearing plate, with female threads provided on the inner circumferential surface of the hollow cylindrical body, and the sleeve can be connected to the bearing plate by screwing the female threads and the male threads together.

[0019] More preferably, the fixing device further includes a covering cylinder of a hollow cylindrical body that covers at least a portion of the sleeve and the wedge exposed from the sleeve, with the end face on the bearing plate side open and the opposite end face closed, and the inner surface of the covering cylinder is provided with female threads, and the connecting jig is a hollow cylindrical body provided perpendicular to the bearing plate on the fixing device side of the bearing plate, with male threads provided on the outer surface of the hollow cylindrical body, and the sleeve can be connected to the bearing plate via the covering cylinder by screwing the female threads and the male threads together.

[0020] More preferably, the hollow cylindrical body may be provided with a through hole through which the inner and outer circumferential surfaces pass, and the outer circumferential surface of the sleeve can be visually confirmed through the through hole.

[0021] More preferably, the outer circumferential surface of the sleeve is provided with male threads, and the connecting jig can be configured such that the sleeve is connected to the bearing plate by screwing the female threads into the female threads, which are provided in a non-through hole on the surface of the fixing device of the bearing plate and which are capable of screwing the male threads into the female threads.

[0022] More preferably, the fixing tool further includes a covering cylinder which is a hollow cylindrical body with an open end face on the side of the pressing plate and a closed opposite end face, covering at least a part of the sleeve and the wedge exposed from the sleeve. A female thread is provided on the inner peripheral surface of the covering cylinder or a male thread is provided on the outer peripheral surface of the covering cylinder. The sleeve is provided with a male thread that screws into the female thread provided on the inner peripheral surface of the covering cylinder on the outer peripheral surface opposite to the pressing plate, or a female thread that screws into the male thread provided on the outer peripheral surface of the covering cylinder on the inner peripheral surface opposite to the pressing plate. By screwing the female thread and the male thread together, at least a part of the sleeve and the wedge exposed from the sleeve can be covered by the covering cylinder.

[0023] More preferably, in a state where the sleeve and the wedge are covered by the covering cylinder, the end portion of the wedge is pressed against the inner surface on the pressing plate side at the opposite end face, so that the covering cylinder can be configured to exhibit a wedge pressing function.

[0024] More preferably, in a state where the sleeve and the wedge are covered by the covering cylinder, a communication hole for communicating the covered internal space with the outside can be provided in the opposite end face.

[0025] A method for anchoring PC steel members according to another aspect of the present invention is a method for anchoring PC steel members using an anchoring device that anchors the PC steel members in a wedge manner on the fixing side when introducing prestress to a concrete structure by pulling on one side, wherein the anchoring device includes a bearing plate provided on the end face of the concrete structure, a sleeve connected to the anchoring device side of the bearing plate, a wedge enclosed in the sleeve, and a covering cylinder of a hollow cylindrical body that covers the sleeve and the wedge, with the end face on the bearing plate side being open and the opposite end face being closed, wherein the sleeve is the bearing plate The system is configured to be connectable to the bearing plate via a connecting jig provided on the anchoring device side, and the connection step involves connecting the sleeve to the anchoring device side of the bearing plate using the connecting jig provided on the anchoring device side of the bearing plate so that the sleeve is in contact with the bearing plate; a preparation step involves attaching the wedge to the sleeve and inserting the PC steel material from the tensioning side and positioning it in the anchoring device on the fixed side, and confirming the excess length of the PC steel material on the fixed side; and if the wedge is not held in place by the covering cylinder, a pressing jig is used in front The present invention is characterized by comprising: a wedge-holding step of holding down the wedge; a filling step of filling the covering cylinder with resin after the preparation step; a covering step of covering at least a portion of the sleeve and the wedge exposed from the sleeve with the resin-filled covering cylinder, and, if the wedge-holding step is not performed, pressing the end of the wedge against the inner surface on the bearing plate side of the opposite end face to hold down the wedge; a confirmation step of checking the amount of resin filled using a communication hole provided on the opposite end face of the covering cylinder that connects the internal space where the sleeve and the wedge are covered with the outside, if it is necessary to check the amount of resin filled after the covering step; an embedding step of pouring concrete into the installation area of ​​the fixing device on the fixed side and embedding the fixing device on the fixed side in concrete after the covering step, or after the confirmation step which is performed as necessary and the communication hole is closed; and a tensioning step of tensioning the PC steel material from the tensioning side after the embedding step. [Effects of the Invention]

[0026] According to the present invention, there is provided a fixture used when prestressing a concrete body (including precast concrete) by a post-tensioning method, which is a fixture for fixing a PC steel material by a wedge method on the fixed side when the concrete body is tensioned by single-sided pulling. When the PC steel material is tensioned after the fixture is embedded in the concrete, it can be suitably used even in a narrow working space, and a fixture and a fixing method capable of suppressing the delay of the process can be provided.

Brief Description of the Drawings

[0027] [Figure 1] It is a diagram for explaining the procedure of replacing a floor slab in a state where one lane of one side of a bridge on a two-lane road on one side is passable. [Figure 2] It is a diagram for explaining a fixture 1100 (including a covering cylinder called a cap 1170) according to the first embodiment of the present invention. [Figure 3] It is a diagram for explaining a fixture 1200 (including a covering cylinder called a cap 1270) according to the second embodiment of the present invention. [Figure 4] It is a diagram for explaining a fixture 1300 (including a covering cylinder called a cap 1370) according to the first embodiment of the present invention. [Figure 5] It is a part drawing of the fixture 1100 shown in FIG. 2(C). [Figure 6] It is a part drawing of the fixture 1200 shown in FIG. 3(C). <UNK> [Figure 7] It is a part drawing of the fixture 1300 shown in FIG. 4(C). [Figure 8] ] It is a diagram (part 1) for explaining a fixing method using a fixture 1100 (including a covering cylinder called a cap 1170). [Figure 9] It is a diagram (part 2) for explaining a fixing method using a fixture 1100 (including a covering cylinder called a cap 1170).

Modes for Carrying Out the Invention

[0028] In the following, the anchoring device and anchoring method according to embodiments of the present invention will be described in detail with reference to the figures. This anchoring device is used when applying prestress to a concrete frame (concrete structure) by a post-tensioning method, and anchors the PC steel material on the fixed side by a wedge method when tensioning the concrete frame by one-sided tensioning. Note that in the drawings, different members may not be clearly distinguished by the type of hatching in the cross-sectional view. In addition, the grout injection port for injecting grout into the sheath may be provided on the sheath or on the bearing plate, but in this embodiment, a sheath connecting cylinder 1120 is provided (erected) on the tensioning side surface of the bearing plate, and a grout injection port 1122 opening upward is provided (as shown in Figures 2 to 4 of this application), but a grout injection port opening downward may also be provided (as shown in Figures 5 to 9 of this application).

[0029] The anchoring device according to this embodiment is a PC steel anchoring device that anchors PC steel materials in a wedge manner on the fixed side when tensioning a concrete structure by single-sided tensioning, and the PC steel materials are tensioned after the anchoring device is embedded in concrete. This anchoring device includes a bearing plate provided on the end face of the concrete structure, a sleeve connected to the anchoring device side of the bearing plate, and a wedge enclosed within the sleeve. The most significant technical feature of the present invention is that the sleeve is configured to be connectable in a state of contact with the bearing plate via a connecting jig provided on the anchoring device side of the bearing plate.

[0030] Furthermore, in the fixing device according to this embodiment, the differences in the connecting jig that connects the sleeve to the bearing plate can be broadly divided into three types: Type 1 (reference numeral 1100 series), shown in Figures 2 and 5, in which an "internal female threaded pipe is erected on the bearing plate"; Type 2 (reference numeral 1200 series), shown in Figures 3 and 6, in which an "external male threaded pipe is erected on the bearing plate"; and Type 3 (reference numeral 1300 series), shown in Figures 4 and 7, in which a "non-penetrating internal female threaded hole is drilled in the bearing plate". However, the same reference numeral is used for structures common to all three types of fixing devices (including those that have slightly different shapes or dimensions but perform the same function).

[0031] Furthermore, in order to distinguish the form of the anchoring device in each step of tensioning the PC steel material using the anchoring device, including these figures, the following states are shown in Figure 2 (Aspects (A) to (D)), Figure 3 (Aspects (A) to (C))), and Figure 4 (Aspects (A) to (D)) to distinguish the form of the anchoring device in each procedure (step) of tensioning the PC steel material using the anchoring device: (a) a state consisting only of a bearing plate (more specifically, a state in which a connecting jig is attached to the bearing plate body: this will not be explained again below), (b) a state in which a sleeve is connected to the bearing plate body and a wedge is installed inside the sleeve connected to the bearing plate, (c) a state in which a covered cylinder called a cap (with female threads on the inner circumference) is provided at the fixed end of the sleeve, and (d) a state in which a covered cylinder called a cap (with male threads on the outer circumference) different from that in (c) is provided at the fixed end of the sleeve.

[0032] First, Figure 2 shows a first embodiment of the present invention, in which an internally threaded pipe (a hollow cylindrical body 1112 with an internal thread 1116 on its inner surface) erected on the anchoring side surface of the bearing plate body 1118 is used as a connecting jig (the bearing plate portion 1110 is formed by the bearing plate body 1118 and the hollow cylindrical body 1112 which is the connecting jig; however, the bearing plate portion 1110 may optionally further include a grout injection related portion), and an anchoring device 1100 (Type 1) including a covering cylinder called a cap 1170 is shown in the following embodiments (A) to (D). Furthermore, Figure 5 shows diagrams of the components constituting the anchoring device 1100 shown in Figure 2(C) in three-view drawings, etc.

[0033] Figure 2(A) shows the bearing plate section 1110 (a bearing plate body 1118 with a hollow cylindrical body 1112, which is a connecting jig, attached to it) set on the precast PC frame. Figure 2(B) shows the anchoring device 1111 with a wedge 1160 enclosed inside the sleeve 1150 and a PC steel member 200 inserted from the tensioning side set in place (at this time, the sleeve 1150 is connected to the bearing plate section 1110). The connecting jig is a hollow cylindrical body 1112 provided perpendicular to the anchoring side surface of the bearing plate body 1118 in the bearing plate portion 1110. A female thread 1116 is provided on the inner circumference of the hollow cylindrical body 1112, and when this female thread 1116 is screwed into a male thread 1150M provided on the outer circumference of the sleeve 1150, the sleeve 1150 is connected to the bearing plate body 1118 in a state where it is in contact with the bearing plate body 1118. Figure 2(C) shows an anchoring device 1100 including a covering cylinder called a cap 1170 (the female thread 1176 provided on the inner circumference of the cap 1170 is screwed into the male thread 1150M provided on the outer circumference of the sleeve 1150). Figure 2(D) shows a fixing device 1101 that includes a covered cylinder called a cap 1171 (the female thread 1177 on the outer surface of the cap 1171 is screwed into the female thread 1151F on the inner surface of the sleeve 1151).

[0034] Next, Figure 3 shows a second embodiment of the present invention, in which an outer-circumferential male thread pipe (a hollow cylindrical body 1212 with male threads 1216 on its outer circumference) erected on the anchoring side surface of the bearing plate body 1118 is used as a connecting jig (the bearing plate portion 1210 is formed by the bearing plate body 1118 and the hollow cylindrical body 1212 which is the connecting jig; however, the bearing plate portion 1210 may optionally further include a grout injection related portion), and an anchoring device 1200 (Type 2) including a covering cylinder called a cap 1270 is shown in the following embodiments (A) to (C). Furthermore, Figure 6 shows diagrams of the components constituting the anchoring device 1200 shown in Figure 3(C) in three-view drawings, etc.

[0035] Figure 3(A) shows the bearing plate section 1210 (a bearing plate body 1118 with a hollow cylindrical body 1212, which is a connecting jig, attached to it) set on the precast PC frame. Figure 3(B) shows the anchoring device 1211 with a wedge 1160 enclosed inside the sleeve 1152 and a PC steel member 200 inserted from the tensioning side set in place (at this time, the sleeve 1152 is not connected to the bearing plate section 1210). Figure 3(C) shows the anchoring device 1200 including a covering cylinder called a cap 1270 (the female thread 1276 on the inner circumference of the cap 1270 is screwed into the male thread 1216 on the outer circumference of the hollow cylindrical body 1212). The connecting jig is a hollow cylindrical body 1212 provided perpendicular to the fixing device side surface of the bearing plate body 1118 in the bearing plate portion 1210. A male screw 1216 is provided on the outer circumference of the hollow cylindrical body 1212, and when this male screw 1216 is screwed into a female screw 1276 provided on the inner circumference of a covering cylinder called a cap 1270, the sleeve 1152 is connected to the bearing plate body 1118 via the cap 1270 in a state where the sleeve 1152 is in contact with the bearing plate body 1118. In order to standardize parts, the male screw may be provided on the outer circumference of the sleeve 1152 (along its entire length).

[0036] Furthermore, Figure 4 shows a third embodiment of the present invention, in which a non-penetrating female screw hole 1312 (a non-penetrating hole with a female screw 1316 on its inner circumference) drilled on the anchoring side surface of the bearing plate body 1318 is used as a connecting jig (the bearing plate portion 1310 is formed by the bearing plate body 1318 and the non-penetrating female screw hole 1312 which is the connecting jig; however, the bearing plate portion 1310 may optionally further include a grout injection related portion), and an anchoring device 1300 (Type 3) including a covering cylinder called a cap 1370 is shown in the following embodiments (A) to (D). Furthermore, Figure 7 shows diagrams of the components constituting the anchoring device 1300 shown in Figure 4(C) in three-view drawings, etc.

[0037] Figure 4(A) shows the bearing plate section 1310 (a bearing plate body 1318 with a connecting jig, such as a non-penetrating female screw hole 1312, added) set on the precast PC frame. Figure 4(B) shows the anchoring device 1311 with a wedge 1160 enclosed inside the sleeve 1150 and a PC steel member 200 inserted from the tensioning side set in place (at this time, the sleeve 1150 is connected to the bearing plate section 1310). The connecting jig is a non-through female screw hole 1312 provided by drilling a shallow circular hole perpendicular to the fixing device side surface of the bearing plate body 1318 in the bearing plate portion 1310 (cutting a shallow circular hole into the fixing device side surface of the bearing plate body 1318). The female screw 1316 provided on the inner circumference of the non-through female screw hole 1312 and the male screw 1150M provided on the outer circumference surface of the sleeve 1150 are screwed together, so that the sleeve 1150 is in contact with the bearing plate body 1318 and the sleeve 1150 is connected to the bearing plate body 1318. Figure 4(C) shows a fixing device 1300 including a covered cylinder called a cap 1370 (where the female thread 1376 on the inner surface of the cap 1370 is screwed with the male thread 1150M on the outer surface of the sleeve 1150), and Figure 4(D) shows a fixing device 1301 including a covered cylinder called a cap 1371 (where the female thread 1377 on the outer surface of the cap 1371 is screwed with the female thread 1151F on the inner surface of the sleeve 1151).

[0038] In Figures 2 and 4, when screwing the cap and sleeve together, the bearing plate and sleeve 1150 are screwed together first, and then the cap is screwed onto the sleeve 1150. Therefore, to prevent the screw connection between the bearing plate and sleeve from loosening when the cap is screwed on, it should be noted that the screw direction (right-hand thread, left-hand thread) should be the same for the bearing plate and sleeve, and for the sleeve and cap. The three types of fixing devices according to this embodiment will be described in more detail below. In the following, there may be cases where the fixing device of type 1 is used as a representative example (for example, the sleeve will be represented by sleeve 1150 and the cap by cap 1170).

[0039] Referring to Figures 2 and 5, the (Type 1) anchoring device according to this embodiment has a male thread 1150M on the outer circumferential surface of the sleeve 1150, and the connecting jig is a pipe-shaped hollow cylinder 1112 that is provided perpendicular to the bearing plate body 1118 (for example by welding) on ​​the anchoring device side of the bearing plate body 1118, and a female thread 1116 is provided on the inner circumferential surface of the hollow cylinder 1112, and the female thread 1116 of the hollow cylinder 1112 and the male thread 1150M of the sleeve 1150 are screwed together so that the sleeve 1150 is connected to the bearing plate body 1118 and forms the bearing plate portion 1110 of the anchoring device. At this time, the sleeve 1150 is connected in a state in contact with the bearing plate body 1118. Furthermore, a sheath connecting cylinder 1120 is provided on the tensioning side surface of the bearing plate body 1118 in the bearing plate section 1110, and a grout inlet 1122 opening upwards is provided in the sheath connecting cylinder 1120 (the sheath connecting cylinder 1120 and the grout inlet 1122 will not be described repeatedly below).

[0040] Referring to Figures 3 and 6, the (Type 2) anchoring device according to this embodiment further includes a hollow cylindrical covering cylinder (cap 1270) that covers at least a portion (meaning "a portion," "all," and "almost all," and not repeated below) of the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150, with the end face on the bearing plate body 1118 side open and the opposite end face closed. The inner circumferential surface of the cap 1270 is provided with an internal thread 1276. The connecting jig is a hollow cylindrical body 1212 that is provided perpendicular to the bearing plate body 1118 on the fixing device side of the bearing plate body 1118 (for example, by welding), and a male thread 1216 is provided on the outer circumference of the hollow cylindrical body 1212, and the male thread 1216 of the hollow cylindrical body 1212 and the female thread 1276 of the cap 1270 are screwed together so that the sleeve 1152 is connected to the bearing plate body 1118 via the cap 1270, which is a covering cylinder (the sleeve 1150 is in contact with the bearing plate body 1118), thereby forming the bearing plate portion 1210 of the fixing device.

[0041] In the (Type 1) anchoring devices shown in Figures 2 and 5, and the (Type 2) anchoring devices shown in Figures 3 and 6, a pipe-shaped hollow cylinder 1112 (with a female thread on its inner circumference) or a pipe-shaped hollow cylinder 1212 (with a male thread on its outer circumference) is provided as a connecting jig, perpendicular to the bearing plate body 1118 on the anchoring device side of the bearing plate body 1118 (for example, by welding). The hollow cylinder 1112 shown in Figure 5(A) and the hollow cylinder 1212 shown in Figure 6(A) are provided with a through hole 1114 through which the inner and outer circumferences pass, allowing the outer circumference of the sleeve 1150 to be visually confirmed through the through hole 1114. This makes it possible to visually confirm whether the end face of the sleeve 1150 on the bearing plate side is in contact with the end face of the bearing plate body 1118 on the anchoring device side. It is also possible to determine whether the end face of the sleeve 1150 on the bearing plate side is in contact with the end face of the bearing plate body 1118 on the fixing device side by the amount of screwing (amount of rotation) and / or the length of screwing, etc., without providing this through hole 1114.

[0042] Referring to Figures 4 and 7, the (Type 3) anchoring device according to this embodiment has a male screw 1150M on the outer circumferential surface of the sleeve 1150, and the connecting jig has a non-through female screw hole 1312 on the anchoring device side surface of the bearing plate body 1318, with a female screw 1316 that can be screwed into the male screw 1150M, and the sleeve 1150 is connected to the bearing plate body 1118 by screwing the female screw 1316 and the male screw 1150M (screwed until the sleeve 1150 abuts against the bearing plate body 1318), thereby forming the bearing plate portion 1310 of the anchoring device. At this time, the sleeve 1150 is connected in a state where it abuts against the bearing plate body 1318. For example, the non-through female screw hole 1312 of the connecting jig is provided by drilling a shallow (non-through) hole perpendicular to the fixing device side surface of the bearing plate body 1118, corresponding to the diameter of the sleeve 1150, and providing (drilling) a female screw 1316 that can be screwed into the male screw 1150M of the sleeve 1150 in that shallow hole, but is not limited to this.

[0043] In addition to the fact that the (Type 2) fixing device 1200 described above includes a cap 1270, the (Type 1) fixing devices shown in Figures 2 and 5, and the (Type 3) fixing devices shown in Figures 4 and 7, further include a covering cylinder (cap 1170, cap 1171, cap 1370, cap 1371) of a hollow cylindrical body that covers at least a portion of the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150, with the end face on the bearing plate body 1118 side open and the opposite end face closed.

[0044] The inner circumferential surface of cap 1270 is provided with female threads 1276, the inner circumferential surfaces of caps 1170 and 1370 are provided with female threads 1176, and the outer circumferential surfaces of caps 1171 and 1371 are provided with male threads 1177.

[0045] Sleeve 1150 has a male thread 1150M on its outer circumferential surface opposite to the bearing plate (which may be the entire length of the outer circumferential surface) that screws into a female thread 1176 on the inner circumferential surface of the covering cylinder (cap), and sleeve 1151 has a female thread 1150F on its inner circumferential surface opposite to the bearing plate that screws into a male thread 1177 on the outer circumferential surface of the covering cylinder (cap). In the (Type 2) fixing device 1200, the female thread 1276 on the inner circumferential surface of the cap 1270 screws into the male thread 1216 on the outer circumferential surface of the hollow cylinder 1212, so sleeve 1152 does not have either a male or female thread (although it may be provided to standardize parts). When the male thread 1216 and the female thread 1276 are screwed together (Type 2), when the female thread 1176 and the male thread 1150M are screwed together (Types 1 and 3), or when the male thread 1177 and the female thread 1151F are screwed together (Types 1 and 3), at least a portion of the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150 are covered by the covering cylinder (cap). When the male thread 1150M is provided on the outer circumference surface along the entire length of the sleeve 1150 (in the axial direction of the PC steel material 200) (because this male thread is mainly used for connecting to the bearing plate), it is necessary to set the female thread 1176 on the inner circumference surface of the cap 1370 to screw into this male thread 1150M.

[0046] As described above, in the fixing device according to this embodiment (Type 1, Type 2, and Type 3), when the sleeve 1150 (represented here as sleeve 1150) and wedge 1160 are covered by a covering cylinder (caps 1170, 1171, 1270, 1370, 1371, represented here as cap 1170), the end of the wedge 1160 (on the side opposite the bearing plate) is pressed against the inner surface 1178 on the bearing plate side of the closed opposite end face, causing the covering cylinder (cap 1170) to perform a wedge retaining function. This eliminates the need for conventionally used wedge retainers (retaining washers + hex socket head bolts). The excess length portion of the fixed side of the PC steel material 200 is stored in the excess length storage portion 1172.

[0047] As described above, in the fixing devices of this embodiment (Type 1, Type 2, and Type 3), when the sleeve 1150 (represented here as sleeve 1150) and wedge 1160 are covered by a covering cylinder (caps 1170, 1171, 1270, 1370, 1371, represented here as cap 1170), a communication hole 1174 is provided on the closed opposite end face that connects the covered internal space to the outside. In the fixing method, as will be described in detail later, the communication hole 1174 is sealed with a sealing material such as tape and the covering cylinder (cap 1170) is filled with resin (for example, pre-grout resin for the ultra-high temperature side). After that, the covering cylinder (cap 1170) covers at least a part of the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150. At this time, the end of the wedge 1160 on the side opposite the bearing plate is pressed against the inner surface 1178 on the bearing plate side of the closed opposite end face, thereby holding the wedge 1160 in place, and the fixed excess length portion of the PC steel material 200 is stored in the excess length storage portion 1172. Subsequently, if it is necessary to check the amount of resin filling into the sleeve 1150, the sealing material such as tape that was sealing the communication hole 1174 is removed, and it is confirmed that a sufficient amount of resin has been filled into the sleeve 1150 by the leakage of resin from the communication hole 1174. By going through these confirmation steps, reliable watertightness (prevention of slag from entering the sleeve) can be achieved.

[0048] The fixing method using the fixing device having the structural features described above will be explained below with reference to Figures 8 and 9. In the following explanation, it will be assumed that the Type 1 fixing device 1200 shown in Figures 2(C) and 5 is being used (the fixing method is basically the same for other types). Furthermore, the grout injection process into the sheath 100 will not be explained as it is of little relevance to the present invention.

[0049] First, referring to Figure 8, we will explain the overall configuration (including the tensioning side and the fixing side) of the method for fixing PC steel materials using a wedge-type fixing device when tensioning a concrete structure with one-sided tensioning.

[0050] Figure 8(A) shows the state after the connection step has been completed in the fixing method described later, and Figure 8(B) shows the state after the subsequent steps, the preparation step, the wedge pressing step (optional configuration), the filling step, the covering step, and the confirmation step (optional configuration), have been completed. After that, the fixing method according to this embodiment is completed through the burying step and the tensioning step.

[0051] The structures other than the fixed-side space shown in Figure 8(A) are either precast PC slabs manufactured at a precasting factory or precast PC slabs constructed on-site using formwork and concrete pouring. While not limited to these, the axial length of the PC steel members 200 in the fixed-side space is approximately 200 mm (the length perpendicular to the axial direction of the PC steel members 200 is also approximately 200 mm: the size of the top-view workspace is approximately 200 mm square).

[0052] In Figure 8(A), as described above, the connection step is completed on the fixed side, and the male thread 1150M, which is provided on the outer surface (along its entire length) of the sleeve 1150, is screwed into the female thread 1116, which is provided on the inner surface of the hollow cylindrical body 1112 of the bearing plate portion 1110, until the bearing plate side end face of the sleeve 1150 abuts against the bearing plate body 1118.

[0053] In this state, the wedge 1160 is attached (enclosed) in the sleeve 1150, and the PC steel material 200 is inserted into the sheath 100 from the tension side toward the fixed side and placed on the fixing device 1100 on the fixed side, and the excess length of the PC steel material 200 on the fixed side is confirmed. The covering cylinder (cap 1170) is filled with resin, and the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150 are covered with the resin-filled covering cylinder (cap 1170), and the end of the wedge 1160 (on the opposite side of the bearing plate) is pressed against the inner surface 1178 on the bearing plate body 1118 side of the closed opposite end face of the covering cylinder (cap 1170), thereby holding down the wedge 1160, and the preparation for pouring concrete into the fixed side space is completed as shown in Figure 8(B).

[0054] The fixing method according to this embodiment will be described in more detail with reference to Figure 9. Note that the following fixing method includes optional steps (steps that do not need to be performed).

[0055] As described above, this anchoring method is a method for anchoring PC steel materials using an anchoring device that anchors the PC steel material in a wedge manner on the fixed side when tensioning a concrete structure by one-sided tensioning. The anchoring device 1100 used includes a bearing plate portion 1110 (a bearing plate body 1118 with a hollow cylindrical body 1112, which is a connecting jig, attached to it) provided on the end face of the concrete structure, a sleeve 1150 connected to the anchoring device side of the bearing plate portion 1110, a wedge 1160 enclosed in the sleeve 1150, and a covering cylinder (cap 1170) of a hollow cylindrical body that covers the sleeve 1150 and the wedge 1160, with the end face on the bearing plate body 1118 side open and the opposite end face closed. The sleeve 1150 is configured to be connectable to the bearing plate body 1118 by a connecting jig (an internally threaded pipe (a hollow cylindrical body 1112 with internal threads 1116 on its inner surface)) which is provided perpendicularly to the surface of the bearing plate body 1118 on the side of the bearing plate body 1118 that faces the anchoring device. The anchoring method includes the following steps.

[0056] As shown in Figure 9(A), in order to manufacture the PC frame (in this case, the floor slab) on site, the formwork 80 is assembled and prepared for concrete pouring (the dotted lines in Figure 9(A) indicate the concrete pouring area). At this time, the through-hole 1114 for visually confirming the position of the sleeve 1150 from the outside is sealed with tape or sealant, and the open end face of the hollow cylindrical body 1112 (equipped with female threads 1116 on its inner circumference) is sealed with protective material 90, etc., to prevent concrete poured into the formwork 80 from flowing in.

[0057] As shown in Figure 9(B), concrete is poured into the assembled formwork 80. After that (after a sufficient amount of time has passed for the concrete to harden), once the concrete has hardened sufficiently, the formwork 80 and protective material 90 are removed. This completes the concrete structure (in this case, a concrete deck slab) with the bearing plate section 1110 embedded in the fixed end face, as shown in Figure 9(B) (same as in Figure 2(A)). Note that the process shown in Figures 9(A) and 9(B) may be carried out in a precast PC structure manufacturing plant and then transported to the construction site for replacing (renewing) the deck slab of a highway bridge. The following explanation basically describes the fixing method (work procedure) on the fixed side.

[0058] <1> Connecting step As shown in Figure 9(C), the sleeve 1150 is connected to the anchoring side of the bearing plate body 1118 using a connecting jig (a hollow cylindrical body 1112 with a female thread 1116 on its inner circumference) provided on the anchoring side of the bearing plate portion 1110, so that the sleeve 1150 is in contact with the bearing plate body 1118. More specifically, a hollow cylindrical body 1112, which is provided perpendicular to the bearing plate body 1118 on the anchoring side of the bearing plate portion 1110 and has a female thread 1116 on its inner circumference, is used as a connecting jig, and the sleeve 1150 is connected to the bearing plate body 1118 by screwing the female thread 1116 and the male thread 1150M provided on the outer circumference of the sleeve 1150 together.

[0059] At this time, the hollow cylindrical body 1112 is provided with a through hole 1114 that penetrates both the inner and outer surfaces, allowing the outer surface of the sleeve 1150 to be visually confirmed through the through hole 1114. This allows the male thread 1150M provided on the outer surface of the sleeve 1150 to be screwed into the female thread 1116 provided on the inner surface of the hollow cylindrical body 1112 of the bearing plate portion 1110 until the bearing plate side end surface of the sleeve 1150 contacts the bearing plate body 1118, while visually confirming whether the bearing plate side end surface of the sleeve 1150 is in contact with the fixing device side end surface of the bearing plate body 1118.

[0060] The reason why the confirmation process using the through hole 1114 is optional in this connection step is that it is possible to determine whether or not the bearing plate side end face of the sleeve 1150 is in contact with the fixing device side end face of the bearing plate body 1118 by the amount of screwing (amount of rotation) and / or the length of screwing without providing the through hole 1114.

[0061] <2> Preparation Steps As shown in Figure 9(D), after the connecting step, the wedge 1160 is attached to the sleeve 1150, and the PC steel bar 200 is inserted into the sheath 100 from the tensioning side and placed in the fixing device on the fixed side, and the excess length of the PC steel bar 200 on the fixed side (for example, 20-30 mm) is checked. When attaching the wedge 1160 to the sleeve 1150, the end face of the wedge 1160 on the side opposite the bearing plate is struck with a hammer or the like to drive it in, but a dedicated jig may also be used.

[0062] <3> Wedge holding step (optional configuration) If the wedge 1160 is not held in place by the covering cylinder (cap 1170), the wedge is held in place by a holding jig (a conventionally used wedge holder (holding washer + hex socket head bolt)). As will be described later, if the wedge 1160 can be held in place by the covering cylinder (the inner surface 1178 on the bearing plate side of the closed opposite end face of the cap 1170), this wedge holding step is unnecessary, which is the reason why this wedge holding step itself is an optional configuration.

[0063] <4> Filling step As shown in Figure 9(E), after the preparation step, the resin is filled into the covering cylinder (cap 1170). At this time, the communication hole 1174, which is used in the confirmation step to check the amount of resin filled into the sleeve 1150, is sealed with a sealing material such as tape.

[0064] <5> Covering step As shown in Figure 9(F), after the filling step, the resin-filled covering cylinder (cap 1170) covers at least a portion of the sleeve 1150 and the wedge 1160 exposed from the sleeve 1150. At this time, the cap 1170 is fixed to the sleeve 1150 by screwing the male thread 1150M on the outer surface of the sleeve 1150 into the female thread 1176 on the inner surface of the cap 1170. However, fitting may be used instead of screwing.

[0065] If the wedge pressing step is not performed, the end of the wedge 1160 (on the side opposite the bearing plate) is pressed against the inner surface 1178 on the bearing plate side of the closed opposite end face to hold the wedge 1160 in place.

[0066] <6> Verification Steps (Optional Configuration) If it is necessary to check the amount of resin filling after the coating step, the sealing material such as tape that sealed the communication hole 1174, which connects the internal space covered by the sleeve 1150 and wedge 1160 to the outside and is located on the closed opposite end face of the coating cylinder (cap 1170), is removed, and it is confirmed that a sufficient amount of resin has filled the sleeve 1150 by the leakage of resin from the communication hole 1174. The reason this confirmation step is optional is that it is not necessary if it is not necessary to check the amount of resin filling.

[0067] <7> Buried steps After the covering step, or after the verification step performed as necessary, and after the communication hole 1174 has been sealed (and after sealing material, etc., has been applied to the necessary locations), concrete is poured into the installation area of ​​the fixed-side anchoring device, and the fixed-side anchoring device is embedded in the concrete. <8> Tension Step After the embedding step (after sufficient time has elapsed for the concrete to harden), the PC steel bars 200 are tensioned from the tensioning side to the specified tension using a hydraulic jack.

[0068] As described above, the PC steel anchoring device and anchoring method according to this embodiment provide an anchoring device and anchoring method that can be suitably used even in a confined workspace when the PC steel is tensioned in a wedge manner on the fixed side when the concrete structure is tensioned by one-sided pulling, and when the PC steel is tensioned after the anchoring device is embedded in concrete.

[0069] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Industrial applicability]

[0070] The present invention is particularly preferable in that it can provide an anchoring device and anchoring method that can be suitably used even in a confined workspace when tensioning a concrete structure (including precast concrete) by a post-tensioning method, and when PC steel is anchored by a wedge method on the fixed side when tensioning a concrete structure by one-sided pulling, and the PC steel is tensioned after the anchoring device is embedded in concrete. [Explanation of Symbols]

[0071] 1100 Fixing device (Type 1) 1110 Bearing plate section 1118 Bearing plate body 1112 Hollow cylindrical body (with internal threads) 1120 Sheath connecting tube 1122 Grout inlet 1150, 1151, 1152 sleeves 1160 Wedge 1170, 1171 Cap (Covered Cylinder) 1200 Fixing device (Type 2) 1210 Bearing plate section 1212 Hollow cylindrical body (with male threads on the outer surface) 1270 Cap (Covered Cylinder) 1300 Fixing device (Type 3) 1310 Bearing plate section 1312 Non-through female threaded hole 1318 Bearing plate body 1370, 1371 Cap (Covered Cylinder)

Claims

1. A PC steel anchoring device for fixing PC steel materials in a wedge manner on the fixed side when introducing prestress to a concrete structure by single-sided tension, wherein the PC steel materials are tensioned after the anchoring device is embedded in concrete. A bearing plate provided on the end face of the concrete structure, A sleeve connected to the fixing device side of the bearing plate, The sleeve includes a wedge, The fixing device is characterized in that the sleeve is configured to be connectable to the bearing plate via a connecting jig provided on the fixing device side of the bearing plate, in a state of contact with the bearing plate.

2. The outer surface of the sleeve is provided with male threads. The fixing device according to claim 1, wherein the connecting jig is a hollow cylindrical body provided perpendicular to the bearing plate on the fixing device side of the bearing plate, and a female thread is provided on the inner circumferential surface of the hollow cylindrical body, and the sleeve is connected to the bearing plate by screwing the female thread and the male thread together.

3. The fixing device further includes a covering cylinder, which covers at least a portion of the sleeve and the wedge exposed from the sleeve, and which is a hollow cylindrical body with an open end face on the bearing plate side and a closed end face on the opposite side, and the inner circumferential surface of the covering cylinder is provided with an internal thread. The fixing device according to claim 1, wherein the connecting jig is a hollow cylindrical body provided perpendicular to the bearing plate on the fixing device side of the bearing plate, and a male screw is provided on the outer surface of the hollow cylindrical body, and the sleeve is connected to the bearing plate via the covering cylinder by screwing the female screw and the male screw together.

4. The fixing device according to claim 2 or 3, characterized in that the hollow cylindrical body has a through hole through which the inner circumferential surface and the outer circumferential surface pass through, and the outer circumferential surface of the sleeve can be visually confirmed through the through hole.

5. The outer surface of the sleeve is provided with male threads. The fixing device according to claim 1, characterized in that the connecting jig has a non-through hole in the surface of the fixing device in the bearing plate, the female screw which can be screwed into the male screw, and the sleeve is connected to the bearing plate by screwing the female screw and the male screw together.

6. The fixing device further includes a covering cylinder, which is a hollow cylindrical body covering at least a portion of the sleeve and the wedge exposed from the sleeve, with the end face on the bearing plate side open and the opposite end face closed, and the inner circumferential surface of the covering cylinder is provided with female threads or the outer circumferential surface of the covering cylinder is provided with male threads. The fixing device according to claim 2, wherein the sleeve is provided with a male thread on its outer circumferential surface opposite to the bearing plate that screws into a female thread provided on the inner circumferential surface of the covering cylinder, or a female thread on its inner circumferential surface opposite to the bearing plate that screws into a male thread provided on the outer circumferential surface of the covering cylinder, and the female thread and the male thread are screwed together so that at least a part of the sleeve and the wedge exposed from the sleeve are covered by the covering cylinder.

7. The fixing device further includes a covering cylinder, which is a hollow cylindrical body covering at least a portion of the sleeve and the wedge exposed from the sleeve, with the end face on the bearing plate side open and the opposite end face closed, and the inner circumferential surface of the covering cylinder is provided with female threads or the outer circumferential surface of the covering cylinder is provided with male threads. The fixing device according to claim 5, wherein the sleeve is provided with a male thread on its outer circumferential surface opposite to the bearing plate that screws into a female thread provided on the inner circumferential surface of the covering cylinder, or a female thread on its inner circumferential surface opposite to the bearing plate that screws into a male thread provided on the outer circumferential surface of the covering cylinder, and the female thread and the male thread are screwed together so that at least a part of the sleeve and the wedge exposed from the sleeve are covered by the covering cylinder.

8. The fixing device according to claim 3, claim 6, or claim 7, characterized in that, with the sleeve and the wedge covered by the covering cylinder, the end of the wedge is pressed against the inner surface on the bearing plate side of the opposite end face, thereby causing the covering cylinder to exhibit a wedge-holding function.

9. The fixing device according to claim 8, characterized in that, when the sleeve and the wedge are covered by the covering cylinder, a communication hole is provided on the opposite end face that connects the covered internal space to the outside.

10. A method for anchoring PC steel materials using an anchoring device that anchors the PC steel material on the fixed side in a wedge manner when introducing prestress to a concrete structure by single-sided tension, The anchoring device includes a bearing plate provided on the end face of the concrete structure, a sleeve connected to the anchoring device side of the bearing plate, a wedge enclosed within the sleeve, and a hollow cylindrical covering cylinder covering the sleeve and the wedge, with the end face on the bearing plate side open and the opposite end face closed, wherein the sleeve is configured to be connectable to the bearing plate via a connecting jig provided on the anchoring device side of the bearing plate. A connecting step in which the sleeve is connected to the fixing device side of the bearing plate using a connecting jig provided on the fixing device side of the bearing plate, such that the sleeve is in contact with the bearing plate, After the aforementioned connecting step, a preparatory step is performed in which the wedge is attached to the sleeve, the PC steel is inserted from the tensioning side and placed in the fixing device on the fixed side, and the excess length of the PC steel on the fixed side is confirmed. If the wedge is not held in place by the covering cylinder, a wedge holding step is performed in which the wedge is held in place with a holding jig. Following the preparation step, a filling step is performed in which resin is filled into the covering cylinder. After the filling step, the covering step involves covering at least a portion of the sleeve and the wedge exposed from the sleeve with the covering cylinder filled with the resin, and if the wedge pressing step is not performed, pressing the end of the wedge against the inner surface on the bearing plate side of the opposite end face to hold the wedge in place. If it is necessary to confirm the amount of resin filled after the coating step, a confirmation step is performed in which the amount of resin filled is confirmed using a communication hole provided on the opposite end face of the coating cylinder, which connects the internal space covered by the sleeve and the wedge to the outside, After the covering step, or after the confirmation step performed as necessary, after sealing the communication hole, concrete is poured into the installation area of ​​the fixed-side anchoring device to embed the fixed-side anchoring device in concrete; An anchoring method characterized by including a tensioning step of tensioning the PC steel material from the tensioning side after the burying step.

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