PC steel material positioning displacement device, PC steel material positioning displacement method

Abstract

To provide a PC steel material position displacement device capable of displacing a position of an existing PC steel material into which tensioning force is introduced.SOLUTION: A PC steel material position displacement device has a frame, a support jig to support a first PC steel material to be displaced, a pulling-up shaft that has a fixture plate to be fixed to the support jig on a first end of a shaft part and a screw part on a second end located on opposite side of the first end of the shaft part, and a nut to be fitted with the screw part of the pulling-up shaft. The frame has a first open hole into which the first PC steel material is inserted, a pulling-up hole that is connected to the first open hole and disposed so as to be orthogonal to longitudinal direction of the first open hole and allows the pulling-up shaft to be inserted, and a support part to support the nut fitted to the pulling-up shaft.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a PC steel material position displacement device and a method for displacing the position of a PC steel material.

Background Art

[0002] Patent Document 1 discloses a tension measuring device including a cylindrical magnetizer arranged to surround a part of a long magnetic body and directly magnetizing the magnetic body to a saturation asymptotic magnetization range in the longitudinal direction, and a magnetic sensor arranged near the longitudinal center of the magnetization section of the magnetic body for detecting the spatial magnetic field strength near the surface of the magnetic body, and measuring the tension acting on the magnetic body based on the spatial magnetic field strength detected by the magnetic sensor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Concrete structures are characterized by being weak in tensile strength. Therefore, prestressing force is applied in advance to concrete structures using PC steel materials such as PC steel strands to control the tensile stress when the concrete structure receives a load.

[0005] PC steel materials are installed in concrete structures and are in a state where prestressing force has been introduced over many years. For this reason, it is required to inspect and maintain PC steel materials after installation. And in order to measure the prestressing force introduced into the PC steel material, it may be required to install a tension measuring device or the like disclosed in Patent Document 1 during inspections or the like. Also, it may be required to visually check the condition of the PC steel material during inspections or the like.

[0006] Furthermore, if inspection reveals rust, damage, or other issues with the PC steel bars, they may be replaced. When replacing PC steel bars, it is necessary to release the tension applied to them. In order to release (unload) the tension applied to the PC steel bars, it may be necessary to install additional equipment such as tension release devices.

[0007] However, if additional equipment such as tension measuring devices or tension release devices are not installed or are not planned for installation when PC steel materials are installed, they may interfere with surrounding members, making it impossible to install the additional equipment.

[0008] In concrete structures, when PC steel materials such as PC steel strands are arranged in close proximity, it is difficult to visually inspect the entire circumference of each PC steel material. Furthermore, when a PC steel material includes multiple PC steel wires, such as PC steel strands, it may be necessary to visually inspect the PC steel wires that make up the PC steel material. However, in the case of PC steel strands, for example, since the PC steel wires that make up the material are twisted together, it is also difficult to visually inspect the parts where the PC steel wires touch each other.

[0009] Therefore, when installing additional equipment on PC steel materials or when visually inspecting the condition of PC steel materials, it was sometimes necessary to shift the position of the PC steel materials.

[0010] However, because tension is applied to PC steel bars installed in concrete structures, it was difficult to displace their position within the concrete structure.

[0011] Therefore, the present disclosure aims to provide a PC steel position displacement device that can displace the position of existing PC steel materials into which tension force has been applied. [Means for solving the problem]

[0012] From one perspective of this disclosure, the frame and, A support jig that supports the first PC steel member whose position is displaced, A lifting shaft having a fixing plate at the first end of the shaft portion for fixing to the support jig, and a threaded portion at the second end of the shaft portion opposite to the first end, A nut that fits with the threaded portion of the aforementioned lifting shaft, It has, The aforementioned frame is The first through-hole into which the first PC steel material is inserted, A lifting hole is provided which is connected to the first through hole and which is perpendicular to the longitudinal side of the first through hole, and into which the lifting shaft is inserted, The present invention provides a PC steel material position displacement device having a support part that supports the nut fitted onto the lifting shaft. [Effects of the Invention]

[0013] According to this disclosure, it is possible to provide a PC steel position displacement device that can displace the position of existing PC steel materials to which tension force has been applied. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is an explanatory diagram of a PC steel position displacement device according to one aspect of the present disclosure. [Figure 2] Figure 2 is a cross-sectional view along line AA' in Figure 1. [Figure 3] Figure 3 is an explanatory diagram of a PC steel position displacement device according to one embodiment of the present disclosure. [Figure 4] Figure 4 is a cross-sectional view along line BB' in Figure 3. [Figure 5] Figure 5 is a flowchart of a method for positional displacement of PC steel according to one aspect of this disclosure. [Figure 6] Figure 6 is a flowchart of a method for positional displacement of PC steel according to one aspect of this disclosure. [Figure 7] Figure 7 is an explanatory diagram illustrating a method for displacing the position of a PC steel member according to one aspect of the present disclosure, in which a plurality of PC steel member position displacement devices are arranged along the longitudinal side of the first PC steel member. [Figure 8] Figure 8 is an explanatory diagram of the gap formation process. [Figure 9] FIG. 9 is an explanatory view of a tool that can be suitably used in the gap forming step. [Figure 10A] FIG. 10A is an explanatory view of a fixing tool that can be used in the gap forming step. [Figure 10B] FIG. 10B is an explanatory view of a fixing tool that can be used in the gap forming step. [Figure 10C] FIG. 10C is an explanatory view of a fixing tool that can be used in the gap forming step.

Mode for Carrying Out the Invention

[0015] The mode for carrying out the invention will be described below.

[0016] [Explanation of Embodiments of the Present Disclosure] First, the embodiments of the present disclosure will be listed and described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0017] (1) The PC steel material position displacement device according to one aspect of the present disclosure includes a frame, a support jig for supporting a first PC steel material whose position is to be displaced, a pull-up shaft having a fixing plate fixed to the support jig at a first end of a shaft portion and having a screw portion at a second end located opposite to the first end of the shaft portion, a nut that fits with the screw portion of the pull-up shaft, and the frame includes a first through hole into which the first PC steel material is inserted, a pull-up hole that is connected to the first through hole and is provided so as to be orthogonal to the longitudinal direction of the first through hole and into which the pull-up shaft is inserted, and a support portion that supports the nut fitted to the pull-up shaft.

[0018] The PC steel position displacement device of this disclosure has a first PC steel member whose position is to be displaced connected to a lifting shaft via a support jig. By fitting a nut onto the threaded portion of the lifting shaft and tightening the nut while supporting it with a frame, the position of the lifting shaft and the first PC steel member connected to the lifting shaft via the support jig can be easily displaced.

[0019] By using the PC steel position displacement device of this disclosure, the position of existing PC steel materials to which tension has been applied can be easily displaced. Therefore, when installing additional equipment such as tension measuring devices or tension release devices on PC steel materials, or when visually observing the condition of PC steel materials, the position of the PC steel materials can be easily displaced to achieve the objective.

[0020] According to the PC steel material position displacement device of this disclosure, when PC steel materials such as PC steel strands are arranged in close proximity within a concrete structure, the position of some of the PC steel materials that are arranged in close proximity can be displaced, and the appearance of each PC steel material can be visually inspected around its entire circumference. Furthermore, when the PC steel materials are PC steel strands or PC steel wire assemblies, the position of some of the PC steel wires constituting the PC steel strands or PC steel wire assemblies can be displaced, and the contact points between the PC steel wires constituting the PC steel strands or PC steel wire assemblies can also be visually inspected.

[0021] (2) In (1) above, the frame may be divided into a first frame and a second frame on a plane passing through the first through hole.

[0022] Because the frame is configured to be separable into a first frame and a second frame, the frame can be easily installed on the existing first PC steel material.

[0023] (3) In (1) or (2) above, the frame has a second through hole provided along the first through hole into which the second PC steel material is inserted, It may have a wall portion disposed between the first through hole and the second through hole.

[0024] The frame has a second through-hole and a wall section, and by placing the second PC steel member in the second through-hole, the reaction force applied to the frame when the first PC steel member is pulled can be supported by the second PC steel member. Therefore, even if there are no concrete structures or the like around the first PC steel member, the first PC steel member can be pulled and its position can be easily displaced.

[0025] (4) In the above (3), the first elastic member may be provided on the inner circumferential surface of the second through hole, at least in the portion in contact with the second PC steel material.

[0026] By providing the first elastic member on at least the portion of the inner circumferential surface of the second through-hole that is in contact with the second PC steel material, it is possible to prevent damage to the second PC steel material.

[0027] (5) In any of (1) to (4) above, the support jig has a recess for inserting the first PC steel material, The cross-section perpendicular to the longitudinal side of the recess may be V-shaped or U-shaped.

[0028] The presence of a recess in the support jig clarifies the insertion point for the first PC steel bar, allowing for easy attachment of the support jig to the first PC steel bar. Furthermore, it restricts the movement of the first PC steel bar within the support jig when it is being towed.

[0029] By making the cross-sectional shape of the support jig V-shaped or U-shaped, the support jig can be easily attached to the first PC steel material even when other members are positioned close to the perimeter of the first PC steel material.

[0030] (6) In any of (1) to (5) above, the second elastic member may be placed on the surface of the support jig that is in contact with the first PC steel material.

[0031] The support jig has a second elastic member, which prevents damage to the first PC steel material when it is pulled.

[0032] (7) A method for positional displacement of PC steel according to one aspect of the present disclosure is: A support jig installation step involves installing a support jig that supports the first PC steel material on the first PC steel material whose position is to be displaced, A lifting shaft installation step involves installing a lifting shaft on the support jig, the lifting shaft having a fixing plate at the first end of the shaft portion for fixing to the support jig, and a threaded portion at the second end of the shaft portion opposite to the first end; A frame installation step in which the frame is installed on the first PC steel material, the support jig, and the lifting shaft, The process includes a displacement step of fitting a nut onto the threaded portion of the lifting shaft and tightening the nut, thereby displacing the positions of the lifting shaft, the support jig, and the first PC steel material supported by the support jig. The aforementioned frame is The first through-hole into which the first PC steel material is inserted, A lifting hole is provided which is connected to the first through hole and which is perpendicular to the longitudinal side of the first through hole, and into which the lifting shaft is inserted, It has a support part that supports the nut fitted onto the lifting shaft, In the frame installation step, the frame is installed such that the first PC steel material is positioned in the first through hole and the lifting shaft is positioned in the lifting hole. In the displacement step, the nut is tightened while the nut is in contact with the support portion.

[0033] According to a method for displacing the position of a PC steel member according to one aspect of this disclosure, the position of the lifting shaft and the first PC steel member connected to the lifting shaft via a support jig can be easily displaced by the above steps.

[0034] According to a method for displacing the position of PC steel members according to one aspect of this disclosure, the position of existing PC steel members to which tension has been introduced as described above can be easily displaced. Therefore, when installing additional equipment such as tension measuring devices or tension release devices on PC steel members, or when observing the condition of PC steel members by visual inspection, the position of the PC steel members can be easily displaced to achieve the objective.

[0035] According to one aspect of the present disclosure, when PC steel materials such as PC steel strands are arranged in close proximity within a concrete structure, the position of some of the PC steel materials arranged in close proximity can be displaced, allowing the appearance of each PC steel material to be visually inspected around its entire circumference. Furthermore, when the PC steel materials are PC steel strands or PC steel wire assemblies, the position of some of the PC steel wires constituting the PC steel strands or PC steel wire assemblies can be displaced, allowing the contact points between the PC steel wires constituting the PC steel strands or PC steel wire assemblies to be visually inspected.

[0036] (8) In the above (7), in the support jig installation step, a plurality of the support jigs are installed along the longitudinal side of the first PC steel material, In the lifting shaft installation step, the lifting shaft is installed in each of the support jigs. In the frame installation process, the frame is installed on a plurality of support jigs and a lifting shaft arranged along the longitudinal direction of the first PC steel material. In the displacement step, the position of the first PC steel material may be displaced at multiple locations along the longitudinal direction of the first PC steel material by fitting the nuts onto each of the lifting shafts and tightening the nuts.

[0037] By performing the method for displacing the position of the PC steel according to one embodiment of this disclosure in parallel at multiple locations along the longitudinal direction of the first PC steel, the first PC steel can be displaced over a wide area along its longitudinal direction. This makes it easy and efficient to install additional equipment such as tension measuring devices and tension release devices, and to observe the condition of the PC steel.

[0038] (9) In (7) or (8) above, the procedure further includes a gap-forming step in which a tool is inserted between the first PC steel material and other members to form a gap before the support jig installation step, In the support jig installation step, the support jig may be inserted into the gap.

[0039] Because the PC steel material position displacement method according to one aspect of this disclosure includes the gap formation step, the PC steel material position displacement method of this embodiment can be easily applied even when it is difficult to install a support jig depending on the arrangement of the first PC steel material. (10) In the above (9), the tool may have a resin film on the part that comes into contact with the first PC steel material.

[0040] By having a resin film on the part of the tool that comes into contact with the first PC steel material, it is possible to prevent scratches from occurring on the surface of the first PC steel material when the tool is inserted between the first PC steel material and other components during the gap formation process. (11) In (9) or (10) above, the tool includes a fixing tool, The fixing tool may be positioned so as to surround the first PC steel material or the other member in a cross-section passing through the fixing tool.

[0041] Since the fixing tool is positioned to surround the first PC steel material or other members, it prevents the tool from detaching during the gap formation process, which would reduce or eliminate the gap formed between the first PC steel material and other members, thereby improving work efficiency.

[0042] [Details of the embodiments of this disclosure] A specific example of a PC steel position displacement device and a PC steel position displacement method according to one embodiment of this disclosure (hereinafter referred to as "this embodiment") will be described below with reference to the drawings. However, the present invention is not limited to these examples and is intended to be shown in the claims, with all modifications within the meaning and scope of equivalence to the claims included.

[0043] In this specification, the names of members and parts may be described with prefixes such as "1st," "2nd," etc., such as "1st PC steel member," "2nd PC steel member," "1st frame," "2nd frame," "1st elastic member," "2nd elastic member," "1st through hole," "2nd through hole," "1st end," "2nd end," "1st side," "2nd side," etc. The prefixes "1st," "2nd," etc., are merely used to identify each member or part and prevent confusion during description, and do not indicate arrangement, priority, etc. Therefore, if there is no particular risk of confusion, they can simply be described as "PC steel member," "frame," "elastic member," "through hole," "end," or "side." [PC steel material positioning device] Figure 1 shows an explanatory diagram of the configuration when the PC steel position displacement device 10 of this embodiment is installed on a first PC steel member 100, which is an existing PC steel member to which tension force has been introduced and which is a PC steel member whose position is to be displaced.

[0044] In this embodiment, the PC steel material position displacement device refers to a device or system that can displace the position of existing PC steel materials to which tension has been applied.

[0045] Figure 1 shows a cross-section of the first PC steel member 100 in a plane perpendicular to its longitudinal side and aligned with the central axis of the lifting shaft 13.

[0046] Figure 2 is a cross-sectional view along line AA' in Figure 1.

[0047] Figure 3 shows another configuration example of the PC steel position displacement device of this embodiment. Figure 3 is an explanatory diagram of the configuration when the PC steel position displacement device 30 of this embodiment is installed on the first PC steel 100, similar to Figure 1. Figure 3 shows a cross-section of the first PC steel 100 in a plane that is perpendicular to the longitudinal side and along the central axis of the lifting shaft 13.

[0048] Figure 4 is a cross-sectional view along line BB' in Figure 3.

[0049] In Figures 1 to 4, the Y-axis is the axis along the longitudinal side of the first PC steel member 100. Therefore, the XZ plane is the plane perpendicular to the longitudinal side of the first PC steel member 100. The Z-axis is the axis along the direction in which the first PC steel member 100 is displaced.

[0050] The first PC steel member 100 is a PC steel member whose position is displaced, and it is a PC steel member to which the existing tension force is introduced.

[0051] The types of PC steel materials 100 are not particularly limited and include, for example, PC steel strands made by twisting together multiple PC steel wires, PC steel wire assemblies, and PC steel wires. PC steel wire refers to steel wire used as a strand in PC steel strands, etc. PC steel wire assemblies refer to PC steel materials made by bundling together multiple PC steel wires without twisting them together.

[0052] The first PC steel material 100 may be a PC steel strand, a PC steel wire assembly, or a PC steel wire, and the second PC steel material 200, which will be described later, may be another PC steel strand, a PC steel wire assembly, or a PC steel wire located in close proximity.

[0053] Furthermore, if the first PC steel material 100 is a PC steel wire, it may, for example, form a single PC steel strand or PC steel wire assembly with the second PC steel material 200 described later. That is, the second PC steel material 200 described later may be a PC steel strand or PC steel wire assembly that included the PC steel wire which is the first PC steel material 100, and the first PC steel material may be a PC steel wire separated from the PC steel strand or PC steel wire assembly.

[0054] The "PC" in terms such as the first PC steel material 100, PC steel stranded wire, PC steel wire assembly, PC steel wire, and the second PC steel material 200 described later, stands for "Prestressed Concrete".

[0055] The PC steel material position displacement device of this embodiment may include a frame, a support jig, a lifting shaft, and a nut, as described below.

[0056] The following describes each component. (1) Support fixture The support jig 12 supports the first PC steel member 100, which is to be displaced. Specifically, the support jig 12 is a member that contacts and supports the first PC steel member 100 when the first PC steel member 100 is pulled in order to displace it. (shape) The support jig 12 only needs to be able to support the first PC steel member 100 when it is being towed, and its shape is not particularly limited, but it is preferable that it be shaped in a way that makes it easy to attach to the first PC steel member 100. For this reason, the support jig 12 may have a recess 121 into which the first PC steel member 100 is inserted. Having a recess 121 in the support jig 12 makes the location for inserting the first PC steel member 100 clear, and the support jig 12 can be easily attached to the first PC steel member 100. In addition, the movement of the first PC steel member 100 within the support jig 12 can be restricted when the first PC steel member 100 is being towed.

[0057] It is preferable that the recess 121, together with the fixing plate 132 of the lifting shaft 13, covers the outer circumference of the first PC steel material 100 when the lifting shaft 13, which will be described later, is connected to the support jig 12.

[0058] It is preferable that the support jig 12 has an outer shape that conforms to the recess 121. For this reason, as shown in Figure 1, it is preferable that the support jig 12 has a V-shape or a U-shape in the cross section perpendicular to the longitudinal side of the recess 121, or in other words, in the cross section perpendicular to the longitudinal side of the first PC steel material 100 inserted into the recess 121. By making the cross-sectional shape of the support jig 12 a V-shape or a U-shape, the support jig 12 can be easily attached to the first PC steel material 100 even when other members are arranged in close proximity around the first PC steel material 100. Specifically, for example, the support jig 12 can be attached to the first PC steel material 100 by placing the first PC steel material 100 in the opening of the recess 121, pushing in the support jig 12, and changing the orientation of the opening of the recess 121 as necessary. (Material) As described above, the support jig 12 is a member that directly supports the first PC steel member 100 when pulling it. For this reason, it is preferable that the support jig 12 is made of a material that transmits the pulling force to the first PC steel member 100 and has hardness that can withstand the tension of the first PC steel member 100. For this reason, it is preferable that the support jig 12 is made of metal, for example. It is even more preferable that the material of the support jig 12 is one or more selected from ductile cast iron (FCD material), general structural rolled steel (SS material), welded structural rolled steel (SM material), machine structural carbon steel (SC material), chromium molybdenum steel (SCM material), etc.

[0059] However, it is preferable that a second elastic member 122 is placed on the surface 12A of the support jig 12 that contacts the first PC steel member 100, in order to prevent scratches or other damage from occurring on the surface of the first PC steel member 100 when the first PC steel member 100 is towed. The support jig 12 having a second elastic member 122 makes it possible to prevent scratches or other damage from occurring on the first PC steel member 100 when the first PC steel member 100 is towed.

[0060] The material of the second elastic member 122 is not particularly limited. If a coating is provided on the surface of the first PC steel material 100, the second elastic member 122 preferably has a lower pencil hardness than the coating provided on the surface of the first PC steel material 100, for example, preferably 6B or more and 4H or less. In this specification, pencil hardness can be measured according to JIS K 5600-5-4 (1999). Examples of materials for the second elastic member 122 include polyethylene, rubber, epoxy resin, etc. (2) Lifting shaft The lifting shaft 13 has a shaft portion 131. The lifting shaft 13 also has a fixing plate 132 at the first end 13A of the shaft portion 131 for fixing to the support jig 12. The lifting shaft 13 can be connected to and fixed to the support jig 12 via the fixing plate 132.

[0061] Furthermore, the lifting shaft 13 has a threaded portion 133 at its second end 13B, which is located opposite the first end 13A of the shaft portion 131, and a nut 14, which will be described later, can be fitted onto this threaded portion 133. The threaded portion 133 is provided on the side of the lifting shaft 13 in order to fit the nut 14, which will be described later.

[0062] The lifting shaft 13 is a member that supports the first PC steel member 100 when pulling it. For this reason, it is preferable that the lifting shaft 13 be made of a material that has hardness capable of resisting the tension of the first PC steel member 100. For this reason, it is preferable that the lifting shaft 13 be made of metal, for example. It is more preferable that the material of the lifting shaft 13 be one or more types selected from ductile cast iron (FCD material), general structural rolled steel (SS material), welded structural rolled steel (SM material), machine structural carbon steel (SC material), chromium molybdenum steel (SCM material), etc. Note that the material of the shaft portion 131 and the fixing plate 132, which will be described below, may be the same or different. (Shaft section) The shaft portion 131 has a fixing plate 132 at the first end 13A and a threaded portion 133 at the second end 13B. The shape of the shaft portion 131 is not particularly limited, but it can be a rod-shaped body, for example, it can have a columnar shape, a cylindrical shape, etc. However, as described above, since a threaded portion 133 is provided, the shaft portion 131 does not need to be a columnar shape in a geometrically strict sense. (Fixed plate) As described above, the lifting shaft 13 has a fixing plate 132 at the first end 13A of the shaft portion 131 for fixing to the support jig 12. The fixing plate 132 is configured to be fixed to the support jig 12 described above by bolts 123 or the like. If the support jig 12 has the recess 121 described above, the fixing plate 132 may have a shape that covers the opening of the recess 121 and may have a hole for inserting the bolts 123. (Screw part) Of the lifting shaft 13, a threaded portion 133 is provided at the second end 13B, which is located opposite the first end 13A of the shaft portion 131.

[0063] The length of the threaded portion 133 along the Z-axis, that is, the length along the longitudinal side of the lifting shaft 13, is not particularly limited. The threaded portion 133 corresponds to the length of the lifting shaft 13 when pulling and displacing the first PC steel material 100. Therefore, the length of the threaded portion 133 along the Z-axis can be selected according to the required amount of displacement of the first PC steel material 100.

[0064] The threaded portion 133 can be configured to allow the position of the lifting shaft 13 to be displaced by fitting a nut 14 (described later) onto it and tightening the nut 14. For this reason, the pitch and other characteristics of the threads of the threaded portion 133 can be selected to engage with the threads of the nut 14. (3) Nut The nut 14 is a component that fits onto the threaded portion 133 of the lifting shaft 13. By fitting the nut 14 onto the threaded portion 133 of the lifting shaft 13 and tightening it, the lifting shaft 13 can be moved along the Z-axis in the figure. At this time, the nut 14 contacts and is supported by the support portion 11B of the frame 11, which will be described later.

[0065] The nut 14 is fitted onto the threaded portion 133 of the lifting shaft 13 and tightened to pull the lifting shaft 13 and the first PC steel material 100 supported by the lifting shaft 13 via the support jig 12. For this reason, it is preferable to select the shape of the threads on the inner circumference and the material of the nut 14 so that they can withstand the tension applied to the first PC steel material 100 and support the lifting shaft 13.

[0066] The material of the nut 14 is not particularly limited, but it is preferably made of metal. More preferably, the material of the nut 14 is one or more selected from ductile cast iron (FCD material), general structural rolled steel (SS material), welded structural rolled steel (SM material), machine structural carbon steel (SC material), chromium molybdenum steel (SCM material), etc. (4) Frame The frame 11 can be positioned to cover the displaced portion of the first PC steel member 100, and is a member that houses the support jig 12, a part of the lifting shaft 13, and supports the nut 14.

[0067] The frame 11 has a first through hole 113 into which the first PC steel member 100 is inserted, and a lifting hole 114 connected to the first through hole 113 and provided perpendicular to the longitudinal side of the first through hole 113, into which the lifting shaft 13 is inserted.

[0068] The frame 11 supports the lifting shaft 13 via the nut 14 and pulls the first PC steel member 100, so it is preferable that it has sufficient strength. For this reason, it is preferable that the frame 11 is made of metal. It is more preferable that the material of the frame 11 is one or more selected from ductile cast iron (FCD material), general structural rolled steel (SS material), welded structural rolled steel (SM material), machine structural carbon steel (SC material), chromium molybdenum steel (SCM material), etc. (First through-hole) As shown in Figure 2, the first through-hole 113 is provided to connect the first side surface 11C and the second side surface 11D of the frame 11 so that the first PC steel member 100 can be inserted into it. The first through-hole 113 can accommodate a portion of the first PC steel member 100 that includes a displaceable part. The shape and size of the first through-hole 113 can be selected to allow the insertion of the first PC steel member 100. Since the inner circumferential surface of the first through-hole 113 may come into contact with the first PC steel member 100, an elastic member (not shown) can be placed on its surface. The same material as the first elastic member 23, which can be suitably placed in the second through-hole 21 (described later), can be used as the elastic member, so a detailed explanation is omitted. (Pull-out hole) The lifting hole 114 is a hole through which the lifting shaft 13 is inserted and the lifting shaft 13 moves when the nut 14 fitted onto the lifting shaft 13 is tightened. The lifting hole 114 is provided along the longitudinal side of the lifting shaft 13.

[0069] The size and shape of the lifting hole 114 can be selected so that the lifting shaft 13 can be inserted and so that it does not interfere with the displaced first PC steel member 100.

[0070] Since the lifting hole 114 is provided in connection with the first through hole 113, it is not necessary to clearly distinguish between the first through hole 113 and the lifting hole 114. For example, the first through hole 113 can be provided up to the vicinity of the support portion 11B, which is at the top of the frame 11, so that the first through hole 113 and the lifting hole 114 are integrated into one structure. (Support part) The frame 11 may have a support portion 11B that supports a nut 14 fitted onto the lifting shaft 13.

[0071] The support portion 11B is the area around the opening through which the lifting shaft 13 is pulled out of the lifting hole 114 to the outside of the frame 11, and is the part in contact with the nut 14 fitted to the lifting shaft 13. For this reason, the support portion 11B can be made from the outer surface of the frame 11, but it may be reinforced more than other parts to resist the tension applied to the first PC steel member 100 via the nut 14 and to support the lifting shaft 13. Also, if the outer surface of the frame 11 can sufficiently support the nut 14, the support portion 11B may have the same configuration as the outer surface of other areas of the frame 11. (Frame 1, Frame 2) It is preferable that the frame 11 is configured to be divisible into a first frame 111 and a second frame 112 on the surface passing through the first through hole 113. By configuring the frame 11 to be divisible into a first frame 111 and a second frame 112, the frame 11 can be easily installed on the existing first PC steel material 100.

[0072] Preferably, the first frame 111 and the second frame 112 are configured to be fixed together by fixing bolts 151 and fixing nuts 152, etc. The number of fixing bolts 151 and fixing nuts 152 used to fix the first frame 111 and the second frame 112 is not particularly limited and can be selected according to the required strength and operability of the frame 11.

[0073] Regarding the frame 11, Figures 1 and 2 show an example where the outer shape is a rectangular parallelepiped, but it is not limited to this form and can be any shape, such as a shape along the first through hole 113 and the pull-up hole 114. (Second through hole) As described above, by fitting a nut 14 onto the threaded portion 133 of the lifting shaft 13 and tightening the nut 14, the position of the lifting shaft 13 can be displaced. By displacing the position of the lifting shaft 13, the support jig 12 connected to the lifting shaft 13 and the first PC steel material 100 can also be displaced.

[0074] However, when displacing the first PC steel member 100, it is necessary to support the reaction force applied to the frame 11 via the support jig 12, the lifting shaft 13, and the nut 14. Therefore, as shown in Figures 1 and 2, the bottom surface 11A of the frame 11 can be positioned in contact with a concrete structure 101, for example. With this arrangement, the reaction force applied to the frame 11 can be supported by the concrete structure 101, and the lifting shaft 13 and the first PC steel member 100 can be displaced.

[0075] However, depending on the arrangement of the first PC steel members 100 and the arrangement of the members surrounding the first PC steel members 100, it may not be possible to install the frame 11 so that it is in contact with the concrete structure 101.

[0076] Therefore, the frame 11 of the PC steel displacement device of this embodiment may also have a second through-hole 21 provided along the first through-hole 113 into which the second PC steel material 200 is inserted, as shown in Figures 3 and 4. Furthermore, a wall portion 22 may be provided between the first through-hole 113 and the second through-hole 21.

[0077] The second PC steel member 200 can support the reaction force applied to the frame 11 when the nut 14 fitted onto the threaded portion 133 of the lifting shaft 13 is tightened. (Wall section, first elastic member) By inserting the second PC steel member 200 into the second through-hole 21, and having the second PC steel member 200 come into contact with the wall portion 22 provided between the first through-hole 113 and the second through-hole 21, the second PC steel member 200 can support the reaction force applied to the frame 11 via the wall portion 22.

[0078] The wall portion 22 is provided to separate the first through-hole 113 and the second through-hole 21, but it may also have an opening 221 large enough to allow, for example, the first PC steel member 100 to pass through. The opening 221 can be provided along the longitudinal side of the first PC steel member 100 that is inserted into the first through-hole 113.

[0079] As shown by the dotted line in Figure 3, the wall portion 22 may not have an opening 221 and may be provided so as to completely separate the first through hole 113 and the second through hole 21. By configuring the wall portion 22 without an opening 221, the first PC steel member 100 can be easily held by the wall portion 22 when removing the support jig 12 after inspection of the first PC steel member 100, and the position of the first PC steel member 100 can be prevented from being suddenly displaced.

[0080] Furthermore, the wall portion 22 can also be constructed by making the width of the first through-hole 113 smaller than the width of the second through-hole 21. The widths of the first through-hole 113 and the second through-hole 21 refer to the lengths along the X-axis in the figure.

[0081] Since the wall portion 22 has the function of supporting the frame 11 by being in contact with the second PC steel material 200, it is preferable that it be made of metal. It is more preferable that the material of the wall portion 22 be one or more selected from ductile cast iron (FCD material), general structural rolled steel (SS material), welded structural rolled steel (SM material), machine structural carbon steel (SC material), chromium molybdenum steel (SCM material), etc.

[0082] However, if the wall portion 22 is made of a hard material such as metal, there is a risk that the second PC steel material 200 may be damaged due to contact between the wall portion 22 and the second PC steel material 200.

[0083] Therefore, it is preferable that the first elastic member 23 is provided on at least the portion of the inner circumferential surface 21A of the second through hole 21 that is in contact with the second PC steel material 200. By providing the first elastic member 23 on at least the portion of the inner circumferential surface 21A of the second through hole 21 that is in contact with the second PC steel material 200, it is possible to prevent damage to the second PC steel material 200.

[0084] Typically, the second PC steel member 200 will be in contact with the lower surface 22A of the wall portion 22. For this reason, as shown in Figures 3 and 4, it is preferable to place the first elastic member 23 on at least the lower surface 22A of the wall portion 22. However, as shown in Figures 3 and 4, the first elastic member 23 can also be placed over the entire inner circumferential surface 21A of the second through hole 21.

[0085] Furthermore, the first elastic member 23 can also be placed on part or all of the inner circumferential surface of the first through hole 113 and the lifting hole 114 to prevent damage to the first PC steel material 100. In Figure 3, the first elastic member 23 is not placed in the opening 221 portion, but if the wall portion 22 is configured without an opening 221, it is preferable to place the first elastic member 23 in the portion that would otherwise be the opening 221.

[0086] The material of the first elastic member 23 is not particularly limited. If a coating is provided on the surface of the second PC steel material 200, the first elastic member 23 preferably has a lower pencil hardness than the coating provided on the surface of the second PC steel material 200, for example, preferably 6B or more and 4H or less. Examples of materials for the first elastic member 23 include polyethylene, rubber, epoxy resin, etc. (2nd PC steel material) The second PC steel member 200 is a PC steel member that supports the above-mentioned reaction force. For this reason, it is preferable that the second PC steel member 200 is a PC steel member in which tension force has been introduced so that it can support the above-mentioned reaction force. The second PC steel member 200 may be an existing PC steel member, or it may be a newly installed PC steel member if necessary.

[0087] The type of the second PC steel material 200 is not particularly limited; for example, it may be a PC steel strand made by twisting together multiple PC steel wires, a PC steel wire assembly, or a PC steel wire. The first PC steel material 100 and the second PC steel material 200 may have the same or different composition.

[0088] For example, both the first PC steel material 100 and the second PC steel material 200 may be PC steel strands, and the second PC steel material 200 may be a PC steel strand arranged adjacent to the first PC steel material 100. In this case, either one or both of the first PC steel material 100 and the second PC steel material 200 may be replaced with PC steel strands to form a PC steel wire assembly or a PC steel wire.

[0089] Furthermore, if the first PC steel material 100 is a PC steel wire, the second PC steel material 200 may be a PC steel strand or PC steel wire assembly that contained the PC steel wire, and the first PC steel material may be a PC steel wire separated from the PC steel strand or PC steel wire assembly.

[0090] As shown in Figures 3 and 4, the frame 11 has a second through-hole 21 and a wall portion 22. By placing the second PC steel member 200 in the second through-hole 21, the reaction force applied to the frame 11 when the first PC steel member 100 is pulled can be supported by the second PC steel member 200. Therefore, even if there is no concrete structure 101 or the like around the first PC steel member 100, the first PC steel member 100 can be pulled and its position can be easily displaced.

[0091] The PC steel position displacement device 30 shown in Figures 3 and 4 can have the same configuration as the PC steel position displacement device 10 shown in Figures 1 and 2, except that it has the second through hole 21, wall portion 22, and first elastic member 23. Therefore, the explanation of other points will be omitted.

[0092] The PC steel position displacement device of this embodiment may also have various arbitrary members in addition to the above-mentioned members, as needed.

[0093] The PC steel position displacement device of this embodiment may also include a measuring device for measuring the amount of displacement of the first PC steel 100, the tension of the first PC steel 100, the magnitude of the force used to lift the first PC steel 100, the fastening force of the nut 14, and the appearance of the first PC steel 100. By including the above measuring device, the PC steel position displacement device of this embodiment can measure the amount of change when the position of the first PC steel 100 is displaced, and can accurately displace the first PC steel 100 based on pre-set conditions.

[0094] Furthermore, the PC steel material position displacement device of this embodiment may also have a rotating device that rotates the nut 14 to change the position of the lifting shaft 13. By having the above-mentioned rotating device, the PC steel material position displacement device of this embodiment can automatically change the position of the lifting shaft 13 and displace the position of the first PC steel material 100 without human power. The configuration of the rotating device is not particularly limited and may include a motor and a transmission member connected to the motor to rotate the nut.

[0095] Furthermore, the PC steel position displacement device of this embodiment may also have a control device connected to the above-mentioned measuring device and rotating device. By having a control device, the nut 14 can be rotated by the rotating device based on the measurement value from the measuring device, thereby displacing the position of the first PC steel 100 with greater precision. An alarm device may be connected to the control device as needed and configured to issue an alarm to the operator if an abnormal value is found in the measurement value.

[0096] According to the PC steel material position displacement device of this embodiment described above, the first PC steel material 100 whose position is to be displaced is connected to the lifting shaft 13 via a support jig 12. Then, by fitting a nut 14 onto the threaded portion 133 of the lifting shaft 13 and tightening the nut 14 while supporting it with the frame 11, the position of the lifting shaft 13 and the first PC steel material 100 connected to the lifting shaft 13 via the support jig 12 can be easily displaced.

[0097] By using the PC steel position displacement device of this embodiment, the position of existing PC steel materials to which tension has been applied can be easily displaced. Therefore, when installing additional equipment such as tension measuring devices or tension release devices on PC steel materials, or when visually observing the condition of PC steel materials, the position of the PC steel materials can be easily displaced to achieve the objective.

[0098] According to the PC steel material position displacement device of this embodiment, when PC steel materials such as PC steel strands are arranged in close proximity within a concrete structure, the position of some of the PC steel materials that are arranged in close proximity can be displaced, allowing the appearance of each PC steel material to be visually inspected around its entire circumference. Furthermore, when the PC steel materials are PC steel strands or PC steel wire assemblies, the position of some of the PC steel wires constituting the PC steel strands or PC steel wire assemblies can be displaced, allowing the contact points between the PC steel wires constituting the PC steel strands or PC steel wire assemblies to be visually inspected. [Method for displacing PC steel materials] The method for displacing the PC steel members in this embodiment will now be described. The method for displacing the PC steel members in this embodiment can be carried out using the PC steel member position displacement device described above. Therefore, some matters that have already been explained may be omitted from this description.

[0099] The method for displacing the PC steel material in this embodiment can be carried out according to the flow chart 50 shown in Figure 5. That is, the method for displacing the PC steel material in this embodiment may include a support jig installation step (S1), a lifting shaft installation step (S2), a frame installation step (S3), and a displacement step (S4).

[0100] The process is explained below. (1) Support jig installation process (S1) In the support jig installation process S1, a support jig 12 can be installed on the first PC steel member 100, which is to be displaced. The first PC steel member 100 and the support jig 12 have already been described, so their explanation will be omitted. (2) Lifting shaft installation process (S2) In the lifting shaft installation process (S2), a lifting shaft 13 can be installed on the support jig 12, which has a fixing plate 132 fixed to the support jig 12 at the first end 13A of the shaft portion 131, and a threaded portion 133 at the second end 13B located opposite the first end 13A of the shaft portion 131. (3) Frame installation process (S3) In the frame installation process (S3), the frame 11 can be installed on the first PC steel member 100, the support jig 12, and the lifting shaft 13.

[0101] As previously described, the frame 11 has a first through hole 113 into which the first PC steel member 100 is inserted, and a lifting hole 114 connected to the first through hole 113 and provided perpendicular to the longitudinal side of the first through hole 113, into which the lifting shaft 13 is inserted. The frame 11 also has a support portion 11B that supports the nut 14 fitted onto the lifting shaft 13.

[0102] Therefore, in the frame installation process (S3), the frame 11 can be installed such that the first PC steel member 100 is located in the first through hole 113 and the lifting shaft 13 is located in the lifting hole 114.

[0103] As previously described, if the frame 11 has a first frame 111 and a second frame 112, the first frame 111 and the second frame 112 can be arranged so as to sandwich the first PC steel member 100. Then, the first frame 111 and the second frame 112 can be integrated using fixing bolts 151 and fixing nuts 152, etc., to form the frame 11.

[0104] If the frame 11 does not have a second through-hole 21 or a wall portion 22, it is preferable to install the frame 11 in contact with a structure capable of supporting reaction forces, such as a concrete structure 101 (see Figures 1 and 2).

[0105] If the frame 11 has a second through-hole 21 and a wall portion 22, the frame 11 can be installed such that the second PC steel member 200 is located in the second through-hole 21. (4) Displacement process (S4) By completing the frame installation process (S3), the lifting shaft 13 is installed on the first PC steel member 100 via the support jig 12. The frame 11 is then positioned to cover the displacement portion of the first PC steel member 100, the support jig 12, and the lifting shaft 13.

[0106] Therefore, in the displacement process (S4), the position of the lifting shaft 13, the support jig 12, and the first PC steel member 100 supported by the support jig 12 can be displaced by fitting the nut 14 onto the threaded portion 133 of the lifting shaft 13 and tightening the nut 14. At this time, the nut 14 can be tightened while making contact with the support portion 11B of the frame 11.

[0107] In the displacement process (S4), tightening the nut 14 means fitting the nut 14 onto the threaded portion 133 of the lifting shaft 13 and rotating it. Therefore, in the displacement process (S4), the position of the first PC steel member 100 can also be adjusted by loosening the nut 14 by rotating it in the reverse direction as needed.

[0108] According to the method for displacing the position of the PC steel material of this embodiment, the position of the lifting shaft 13 and the first PC steel material 100 connected to the lifting shaft 13 via the support jig 12 can be easily displaced by the above steps.

[0109] According to the method for displacing the position of PC steel members in this embodiment, the position of existing PC steel members to which tension has been introduced as described above can be easily displaced. Therefore, when installing additional equipment such as tension measuring devices or tension release devices on PC steel members, or when observing the condition of PC steel members by visual inspection, the position of the PC steel members can be easily displaced to achieve the objective.

[0110] According to the PC steel material displacement method of this embodiment, when PC steel materials such as PC steel strands are arranged in close proximity within a concrete structure, the position of some of the PC steel materials that are arranged in close proximity can be displaced, and the appearance of each PC steel material can be visually inspected around its entire circumference. Furthermore, when the PC steel materials are PC steel strands or PC steel wire assemblies, the position of some of the PC steel wires constituting the PC steel strands or PC steel wire assemblies can be displaced, and the contact points between the PC steel wires constituting the PC steel strands or PC steel wire assemblies can also be visually inspected.

[0111] The method for displacing the position of the PC steel material in this embodiment may further include any optional steps as needed. (5) Gap formation process (S11) The method for displacing the PC steel material in this embodiment may also include a gap formation step (S11) before the support jig installation step (S1) described above, as shown in the flow chart 60 in Figure 6.

[0112] In the gap formation process (S11), a tool is inserted between the first PC steel member 100 and the other member to form a gap between the first PC steel member 100 and the other member.

[0113] Depending on the installation location of the first PC steel member 100, there may not be enough space to install the support jig 12 on the first PC steel member 100.

[0114] Furthermore, for example, when the reaction force is supported by the second PC steel member 200 as described above, the first PC steel member 100 and the second PC steel member 200 may be installed in close proximity.

[0115] A specific example is a case where the first PC steel material 100 and the second PC steel material 200 are either PC steel strands, PC steel wire assemblies, or PC steel wires, respectively, and the first PC steel material 100 and the second PC steel material 200 are installed in close proximity.

[0116] Another example is when the first PC steel material 100 and the second PC steel material 200 constitute a single PC steel strand or PC steel wire assembly. In this case, the first PC steel material 100 is the PC steel wire that constitutes the PC steel strand or PC steel wire assembly, and the second PC steel material 200 is the remainder after removing the first PC steel material 100.

[0117] As described above, when the first PC steel member 100 is in close proximity to other members, it is necessary to create a gap between the first PC steel member 100 and the surrounding structure or other members such as the second PC steel member 200 before installing the support jig 12 on the first PC steel member 100.

[0118] Therefore, the method for positional displacement of the PC steel material in this embodiment may also include a gap-forming step (S11) in which a gap is formed between the first PC steel material 100 and other members, as described above.

[0119] Specifically, as shown in Figure 8, for example, a tool 81 can be inserted between the first PC steel member 100 and another member, the second PC steel member 200, to form a gap 82. The other member may be any type of structure as described above, and is not limited to the second PC steel member 200.

[0120] The insertion of the tool 81 described above can also be carried out in multiple stages. For example, the process may include a first gap-forming step of inserting the first tool between the first PC steel material 100 and another member to form a first gap, and a second gap-forming step of further inserting the second tool into the first gap to widen the gap between the first PC steel material 100 and the other member. The first and second tools may be the same tool or different tools. However, in the second gap-forming step, since the gap between the first PC steel material 100 and the other member is widened, it is preferable that the second tool is configured to widen the gap more than when the first tool is used. For this reason, it is preferable that the thickness of the part of the second tool that is inserted between the first PC steel material 100 and the other member is thicker than that of the first tool. The gap-forming step can also be carried out in three or more stages, and may be carried out up to the nth gap-forming step. In this case, n is an integer of 3 or more.

[0121] The tool 81 can be any tool that can be inserted between the first PC steel member 100 and other members, and may be one or more types selected from a crowbar, a plate-shaped spacer, or a fixing tool described later. The tool 81 slightly displaces the position of the first PC steel member 100, but since tension is introduced into the first PC steel member 100, it is preferable that at least a part of it is made of metal.

[0122] However, if the tool 81 is made of metal, scratches or other defects may occur on the surface of the first PC steel material 100 or other members in the portion that comes into contact with the first PC steel material 100 or other members. For this reason, it is preferable that the tool 81 has a metal body portion 811 and a resin film 812 disposed on at least a part of the surface of the body portion 811, as shown in Figure 9. In other words, it is preferable that the tool 81 has a resin film 812 in the portion that comes into contact with the first PC steel material 100 or other members. By having a resin film 812 in the portion of the tool 81 that comes into contact with the first PC steel material 100 or other members, it is possible to prevent scratches from occurring on the surface of the first PC steel material 100 or other members when the tool 81 is inserted between the first PC steel material 100 and other members in the gap formation process (S11).

[0123] Examples of metals for the main body 811 of the tool 81 include iron and stainless steel. The material of the resin film 812 is not particularly limited. If a coating is provided on the surface of the first PC steel material 100 or other members, the resin film 812 preferably has a lower pencil hardness than the coating provided on the surface of the first PC steel material 100 or other members, for example, preferably between 6B and 4H. Examples of materials for the resin film 812 include polyethylene, rubber, epoxy resin, etc.

[0124] Furthermore, the tools used in the gap formation process may include fixing tools. The fixing tool is a tool that can be positioned to surround the first PC steel member 100 or other member in the cross-section passing through the fixing tool, and it is more preferable that the fixing tool is configured to be fixed to the first PC steel member 100 or other member.

[0125] Since the fixing tool is positioned to surround the first PC steel member 100 or other members, it prevents the tool from detaching during the gap formation process, which would reduce or eliminate the gap formed between the first PC steel member and other members, thereby improving work efficiency.

[0126] Examples of the configuration of the fixing tool are shown in Figures 10A to 10C.

[0127] For example, as shown in Figure 10A, the fixing tool 900 may include a plate-shaped spacer 901, a bolt 902 to be inserted into the plate-shaped spacer 901, a plate-shaped body 903, and a nut 904. In the case of the fixing tool 900 shown in Figure 10A, after inserting the plate-shaped spacer 901 between the first PC steel member 100 and the second PC steel member 200, the bolt 902 can be inserted into the bolt hole provided in the plate-shaped spacer 901. Next, after inserting the plate-shaped body 903 onto the bolt 902, the fixing tool 900 can be fixed to the other member, the second PC steel member 200, by tightening the nut 904.

[0128] Furthermore, as shown in Figure 10B, the fixing tool 910 may also include a spacer 911 having an opening 911A, a bolt 912, and a nut 913. After forming a gap between the first PC steel member 100 and the second PC steel member 200, the spacer 911 can be inserted into the gap and the bolt 912 and nut 913 can be attached to the spacer 911 to fix the spacer 911 to the second PC steel member 200, which is another component. Multiple bolt holes may also be provided on the side surface 911B of the spacer 911 along the Z-axis in Figure 10B so that the spacer 911 can be brought into close contact with the second PC steel member 200, which is another component. The tool may also be configured so that the bolt 912 can be inserted into an appropriate bolt hole depending on the size of the second PC steel member 200, which is another component. Alternatively, the side surface 911B of the spacer 911 may be made of a deformable material, and by tightening the bolt 912 and nut 913, the side surface 911B of the spacer 911 may deform and come into contact with the second PC steel material 200.

[0129] As shown in Figure 10C, the fixing tool 920 may also have a belt-shaped spacer 921. A protrusion 922 is provided at the first end along the longitudinal side of the belt-shaped spacer 921, and a through hole 923 into which the protrusion 922 can be inserted is provided at the second end opposite the first end. By inserting the protrusion 922 into the through hole 923, the fixing tool 920 can be fixed to the second PC steel material 200. The belt-shaped spacer 921 may be provided with multiple through holes 923 so that it can be applied regardless of the size of the second PC steel material 200. The method of fixing the belt-shaped spacer 921 to the second PC steel material 200, which is another member, is not limited to the method using the protrusion 922 and the through hole 923, and any method can be used.

[0130] The belt-shaped spacer 921 is preferably made of a material that can deform along the outer shape of the second PC steel material 200, which is another component. However, the region 921A located between the first PC steel material 100 and the second PC steel material 200, for example, may be made of a material with high hardness such as metal. The fixing tool 920 shown in Figure 10C can also be used to tighten and bundle the second PC steel material 200. Therefore, when the second PC steel material 200 is a PC steel wire assembly, the PC steel wires that make up the assembly can be bundled to improve workability.

[0131] Figures 10A to 10C show an example in which the fixing tool is installed on the second PC steel member 200, which is another component. However, the system is not limited to this configuration, and the fixing tool may be installed on the first PC steel member 100, or on both the first PC steel member 100 and the second PC steel member 200.

[0132] Furthermore, while Figures 10A to 10C show an example where the other members have displaced a single PC steel wire, which is the first PC steel material 100, to form a second PC steel material 200, the configuration is not limited to this example.

[0133] The material of the fixing tool is not particularly limited, and one or more materials selected from metal and resin can be used. As with the tool 81, it is preferable to provide a resin film on the first PC steel material 100 and the parts that come into contact with other members. Furthermore, the fixing tool can also be constructed from a resin material in the parts that come into contact with the first PC steel material 100 and other members.

[0134] When the gap formation process (S11) is performed as described above, the support jig installation process (S1) and the like can be performed after the gap formation process (S11), as shown in the flow chart 60 in Figure 6. Then, in the support jig installation process (S1), the support jig 12 can be inserted into the gap 82 formed in the gap formation process (S11).

[0135] Because the PC steel material displacement method of this embodiment includes the gap formation step (S11), the PC steel material displacement method of this embodiment can be easily applied even when it is difficult to install the support jig 12 depending on the arrangement of the first PC steel material 100.

[0136] The method for displacing the PC steel material in this embodiment can also be carried out in parallel at multiple locations along the longitudinal direction of the first PC steel material 100.

[0137] As described above, when the method for displacing the position of the PC steel material of this embodiment is implemented at multiple locations along the longitudinal side of the first PC steel material 100, multiple support jigs 12, lifting shafts 13, frames 11, and nuts 14 can be installed along the longitudinal side of the first PC steel material 100, as shown in Figure 7.

[0138] Therefore, in the support jig installation process (S1), multiple support jigs 12 can be installed along the longitudinal side of the first PC steel material 100.

[0139] In the lifting shaft installation process (S2), the lifting shafts 13 can be installed on each support jig 12.

[0140] In the frame installation process (S3), the frame 11 can be installed on multiple support fixtures 12 and lifting shafts 13 arranged along the longitudinal side of the first PC steel member 100.

[0141] Then, in the displacement process (S4), nuts 14 are fitted onto each lifting shaft 13, and by tightening the nuts 14, the position of the first PC steel member 100 can be displaced at multiple points along the longitudinal direction of the first PC steel member 100.

[0142] As described above, by performing the PC steel displacement method of this embodiment in parallel at multiple locations along the longitudinal direction of the first PC steel 100, the first PC steel 100 can be displaced over a wide area along its longitudinal direction. Therefore, the installation of additional equipment such as tension measuring devices and tension release devices, and the observation of the condition of the PC steel can be carried out easily and efficiently. [Explanation of Symbols]

[0143] 10, 30 PC steel material position displacement device 100 1st PC steel material 101 Concrete Structures 11 frames 111 First Frame 112 Frame 2 11A Bottom 11B Support part 11C 1st side 11D 2nd side 113 First through hole 114 Pull-up holes 12 Support fixture 121 Recess 122 Second Elastic Member 123 volts 12A Surface in contact with the first PC steel bar 13 Lifting shaft 131 Shaft 13A 1st end 13B 2nd end 132 Fixed plate 133 Threaded part 14 nuts 151 Fixing bolts 152 Fixing nut 200 2nd PC steel material 21 Second through hole 21A Inner surface 22 Wall 221 Opening 22A Bottom 23 First elastic member 50, 60 flow S1 Support jig installation process S2 Lifting shaft installation process S3 Frame installation process S4 Displacement Process S11 Gap formation process 81 Tools 811 Main body 812 Resin film 82 gaps 900, 910, 920 fixed tools 901 Plate-shaped spacer 902 volts 903 Plate-like body 904 Nut 911 Spacer 911A opening 911B side 912 volts 913 Nut 921 Belt-shaped spacer 921A area 922 Convex part 923 Through hole XX axis YY axis ZZ axis

Claims

1. Frame and, A support jig that supports the first PC steel member whose position is displaced, A lifting shaft having a fixing plate at the first end of the shaft portion for fixing to the support jig, and a threaded portion at the second end of the shaft portion opposite to the first end, A nut that fits with the threaded portion of the aforementioned lifting shaft, It has, The aforementioned frame is The first through-hole into which the first PC steel material is inserted, A lifting hole is provided which is connected to the first through hole and which is perpendicular to the longitudinal side of the first through hole, and into which the lifting shaft is inserted, A PC steel material position displacement device having a support part that supports the nut fitted onto the lifting shaft.

2. The PC steel material position displacement device according to claim 1, wherein the frame can be divided into a first frame and a second frame on a plane passing through the first through hole.

3. The frame has a second through-hole provided along the first through-hole into which the second PC steel material is inserted, PC steel material position displacement device according to claim 1 or claim 2, comprising a wall portion disposed between the first through hole and the second through hole.

4. The PC steel material position displacement device according to claim 3, wherein the first elastic member is provided on at least the portion of the inner circumferential surface of the second through hole that is in contact with the second PC steel material.

5. The support jig has a recess into which the first PC steel material is inserted, The PC steel material position displacement device according to claim 1 or claim 2, wherein the cross-section perpendicular to the longitudinal side of the recess is V-shaped or U-shaped.

6. The PC steel material position displacement device according to claim 1 or claim 2, wherein a second elastic member is arranged on the surface of the support jig that is in contact with the first PC steel material.

7. A support jig installation step involves installing a support jig that supports the first PC steel material on the first PC steel material whose position is to be displaced, A lifting shaft installation step involves installing a lifting shaft on the support jig, the lifting shaft having a fixing plate at the first end of the shaft portion for fixing to the support jig, and a threaded portion at the second end of the shaft portion opposite to the first end; A frame installation step in which the frame is installed on the first PC steel material, the support jig, and the lifting shaft, The process includes a displacement step of fitting a nut onto the threaded portion of the lifting shaft and tightening the nut, thereby displacing the positions of the lifting shaft, the support jig, and the first PC steel material supported by the support jig. The aforementioned frame is The first through-hole into which the first PC steel material is inserted, A lifting hole is provided which is connected to the first through hole and which is perpendicular to the longitudinal side of the first through hole, and into which the lifting shaft is inserted, It has a support part that supports the nut fitted onto the lifting shaft, In the frame installation step, the frame is installed such that the first PC steel material is positioned in the first through hole and the lifting shaft is positioned in the lifting hole. The displacement step involves tightening the nut while applying it to the support portion, thereby displacing the position of the PC steel material.

8. In the support jig installation step, a plurality of support jigs are installed along the longitudinal side of the first PC steel material. In the lifting shaft installation step, the lifting shaft is installed in each of the support jigs. In the frame installation process, the frame is installed on a plurality of support jigs and a lifting shaft arranged along the longitudinal side of the first PC steel material. The method for displacing the position of a PC steel material according to claim 7, wherein in the displacement step, the nuts are fitted onto each of the lifting shafts and the nuts are tightened to displace the position of the first PC steel material at multiple locations along the longitudinal direction of the first PC steel material.

9. Prior to the support jig installation step, the process further includes a gap-forming step in which a tool is inserted between the first PC steel material and other members to form a gap. The method for displacing the position of a PC steel material according to claim 7 or claim 8, wherein in the support jig installation step, the support jig is inserted into the gap.

10. The method for displacing the position of a PC steel material according to claim 9, wherein the tool has a resin film in the portion that contacts the first PC steel material.

11. The aforementioned tool includes a fixing tool, The method for displacing the position of a PC steel member according to claim 9, wherein the fixing tool can be arranged to surround the first PC steel member or the other member in a cross-section passing through the fixing tool.

Images