JP6770783B2 - How to attach the intermediate fixing tool and the intermediate fixing tool - Google Patents

Description

According to the present invention, the tension force has already been introduced, and both ends thereof are attached to the intermediate portion of the tension material fixed to the structure, and the tension force is introduced into the tension material while maintaining the tension force applied to the surrounding structure. The present invention relates to an intermediate fixing tool for fixing the tension material and a method for attaching the intermediate fixing tool to the tension material.

In some concrete structures, prestress is introduced by the tension force of the buried tension material. Such concrete structures may need to be partially removed for repair, reinforcement or refurbishment. For example, a part of the concrete bridge girder in the width direction may be removed and the remaining part may be replaced with a new bridge girder while maintaining traffic. In addition, when a part of the bridge girder in the axial direction, for example, the girder end portion deteriorates and needs to be repaired, the girder end portion may be temporarily removed and new concrete may be cast for repair. In addition, a part of the building may be demolished. In such a case, a continuous tension material is arranged over the part to be removed and the part to be left of the concrete structure, and when prestress is introduced, the middle part of the tension material is exposed and an intermediate fixing tool is attached. It is fixed to the concrete of the remaining part. Then, in the remaining portion of the concrete structure, the tension force is maintained in the tension material, the tension material in the portion to be removed is cut, and the concrete structure is removed.

As an intermediate fixing tool for fixing the tension material in a state where the tension force is introduced in the intermediate portion, for example, there is one disclosed in Patent Document 1 or Patent Document 2.
In the intermediate fixing tool described in Patent Document 1, two semi-cylindrical members are bonded to each other and attached to a portion where the tension material is exposed, and an inflatable grout is filled and hardened between them to be fixed to the tension material. It is supposed to make you. Then, the fixing tool composed of the two semi-cylindrical members is brought into contact with the bearing layer integrated with the remaining portion of the concrete structure to fix the tension material.
In the intermediate fixing tool described in Patent Document 2, a steel pipe sleeve consisting of two half-split steel sleeves is attached to an exposed PC steel material, and a plurality of plate-shaped C-shaped members are fitted around these half-split steel sleeves. Together, the two half-split steel sleeves are fixed to each other. Then, the expansion material is poured into the steel pipe sleeve, and the steel pipe sleeve and the PC steel material are integrated by the expansion pressure.

Japanese Unexamined Patent Publication No. 6-101344 Japanese Unexamined Patent Publication No. 2007-277826

However, the above-mentioned prior art has problems for which the following solutions are desired.
In the above prior art, semi-cylindrical metal members are combined to form a tubular shape around the tension material, and an expandable filler is filled between the tubular member and the tension material. The tubular member is restrained so as to resist the expansion pressure when the filler is cured. Therefore, the semi-cylindrical member made of metal has a large size and a large weight.
Further, since the tension force of the tensioning material is transmitted from the tubularly connected metal member to the structure via the bearing plate or the flange, a large space is required around the tensioning material to provide the intermediate fixing tool. .. For this reason, its use may be restricted in the portion where other tensioning materials are arranged adjacent to each other.

The present invention has been made in view of the above circumstances, and an object of the present invention is that the weight is small, the workability is good when the tension material is attached, and a large space is required around the tension material. It is to provide an intermediate fixing tool which does not, and a method of mounting the intermediate fixing tool.

In order to solve the above problem, the invention according to claim 1 is the above-mentioned invention in which a continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound in a tubular shape around a tension material to form a tubular shape. A filler having expandability at the time of curing is filled between the continuous fiber sheet and the tension material, and the filler is a tubular continuous fiber sheet with both ends closed and the tension material. The filler and the continuous fiber sheet, which were cured in a state where the expansion was restrained by the continuous fiber sheet and were cured in a state where the expansion pressure acted between the tension material, became the tension material. Provided is an intermediate fixing tool embedded in concrete cast so as to be in close contact with the outer peripheral surface of the continuous fiber sheet which has been fixed and formed into a tubular shape.

In this intermediate fixing tool, the expansion when the filler is cured is restrained by the continuous fiber sheet wound in a tubular shape, and a compressive force acts on the cured filler. Therefore, the cured filler is pressure-welded so as to tighten the tensioning material. Therefore, the cured filler is firmly fixed to the tensioning material, and the tensioning material can be held so as not to come out when the position of the cured filler is restrained. Further, the filler is restrained by a tubular continuous fiber sheet, has high strength, and is embedded in concrete. Therefore, the peripheral surface and the end surface are placed so as to be in close contact with each other, and the concrete is restrained and integrated with the hardened concrete, and the tensile force of the tension material is fixed to the concrete which is a part of the structure through the filler.
In addition, the continuous fiber sheet can be made into a tubular shape by winding it around the tension material, and even if both ends of the tension material are already fixed, it can be easily made into a tubular shape around the middle part of the tension material. it can. Then, the tension material can be fixed to the surrounding structural members by filling the inside of the tubular continuous fiber sheet with an expandable filler and embedding it in concrete.

According to the second aspect of the present invention, in the intermediate fixing tool according to the first aspect, a convex portion is formed on the outer peripheral surface of the continuous fiber sheet wound in a tubular shape.

In this intermediate fixing tool, a convex portion is formed on the outer peripheral surface of the continuous fiber sheet which is filled with a filler inside to form a tubular shape, and concrete is cast so as to be in close contact with the outer peripheral surface. The part is in a state of being pushed into hardened concrete. This makes it possible for the concrete to effectively restrain the filler, which is formed into a block by winding the continuous fiber sheet, from moving in the axial direction of the tension material.

The invention according to claim 3 is the intermediate fixing tool according to claim 1 or 2, wherein the continuous fiber sheet wound in a tubular shape has a wound outer diameter, and the tension material is pulled. It shall shrink in the direction.

In this intermediate fixing tool, a block-shaped filler in which a continuous fiber sheet is wound and whose outer diameter changes is embedded in the hardened concrete, and is displaced relative to the concrete together with the tension material. Resist. In addition, since the outer diameter is reduced in the direction in which the tension material is pulled, a compressive force in the radial direction acts on the filler that has become a block due to the tensile force of the tension material, and the cured filler is used as the tension material. A force that pushes toward you acts. This causes the tension material to be held more firmly by the hardened and blocked filler.

The invention according to claim 4 maintains the shape of the continuous fiber sheet inside the continuous fiber sheet wound in a tubular shape in the intermediate fixing tool according to any one of claims 1 to 3. It shall have a shape-retaining member for this purpose.

In this intermediate fixing tool, it becomes easy to maintain the continuous fiber sheet in a predetermined shape around the tension material by winding the continuous fiber sheet around the shape-retaining member. Therefore, even if the tension material is already held at both ends, the continuous fiber sheet is easily wound around the tension material to easily maintain a predetermined shape, and the filler is inside the tubular continuous fiber sheet. Can be filled.

In the invention according to claim 5, a continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound in a tubular shape around a tensioning material , and both ends of the tubular continuous fiber sheet are closed. A filler that expands during curing is filled between the continuous fiber sheet and the tension material and cured, and concrete is poured so as to be in close contact with the outer peripheral surface of the tubular continuous fiber sheet. The tension material is fixed to the structure in which the concrete is hardened, and in the step of winding the continuous fiber sheet in a tubular shape around the tension material, a part of the winding direction of the continuous fiber sheet is the tension material. Provided is a method for mounting an intermediate fixing tool which is formed into a curved shape so as to surround a part or all of the periphery of the concrete, and a non-molded portion which is flexibly deformed is wound around the molded portion and bonded in a tubular shape. It is a thing.

In this method of mounting the intermediate fixing tool, a part of the continuous fiber sheet is molded into a curved shape, and by winding a flexible non-molded portion around the molded portion, the cylinder can be easily formed around the tension material. Can be shaped. Then, by integrally adhering the continuous fiber sheets wound by an adhesive or the like, it is possible to obtain a strong tubular member that can withstand the expansion pressure at the time of curing of the expandable filler. Therefore, the step of filling the inside of the tubular continuous fiber sheet with an expandable filler and attaching the intermediate fixing tool can be efficiently performed.

In the invention according to claim 6, a continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound in a tubular shape around a tensioning material , and both ends of the tubular continuous fiber sheet are closed. A filler that expands during curing is filled between the continuous fiber sheet and the tension material and cured, and concrete is cast so as to be in close contact with the outer peripheral surface of the tubular continuous fiber sheet. The tension material is fixed to the structure in which the concrete is hardened, and the step of winding the continuous fiber sheet in a tubular shape around the tension material is performed by winding the tubular member in an axially cut surface of the tubular member. A shape-retaining member having a cut shape is previously adhered to the vicinity of one end in the fiber direction of the continuous fiber sheet, and the shape-retaining members are arranged in a tubular shape so as to surround the tension material to form the shape. It provides a method of mounting an intermediate fixing tool in which the continuous fiber sheet is wound around a holding member.

In this method of attaching the intermediate fixing tool, since the shape-retaining member is adhered to a part of the continuous fiber sheet, the continuous fiber sheet to which the shape-retaining member is adhered around the tension material can be easily formed into a tubular shape. In addition, a flexible non-molded portion can be wound around the tubular shape-retaining member. Then, the continuous fiber sheet wound around by an adhesive or the like can be integrally adhered, and the step of filling the inside of the tubular continuous fiber sheet with an expandable filler and attaching the intermediate fixing tool is performed. It can be done efficiently.

As described above, in the intermediate fixing tool of the present invention, it is possible to form an intermediate fixing tool that transmits a tensile force to the structural member at the intermediate portion of the tension material by using a lightweight material, and the work of mounting the intermediate fixing tool. Can be done efficiently. Further, it can be embedded in concrete to transmit the tensile force of the tension material from the end face and the peripheral surface, and can be used as an intermediate fixing tool that can be fixed even in a small space.
Further, in the method of mounting the intermediate fixing tool of the present invention, the work of winding the continuous fiber sheet in a tubular shape can be efficiently performed, and the work of forming the intermediate fixing tool and fixing the tension material in the intermediate portion is efficiently performed. It can be carried out.

It is a side view, a front view and a sectional view which show the intermediate fixing tool which is one Embodiment of this invention. It is the schematic perspective view which shows the state before attaching to the tension material of the continuous fiber sheet which comprises the intermediate fixing tool shown in FIG. 1, and is the schematic diagram which shows the attachment state. It is the schematic perspective view which shows the other example of the continuous fiber sheet which can be used in the intermediate fixing tool shown in FIG. 1, and the schematic diagram which shows the wearing state. It is a schematic perspective view which shows the end plate used for the intermediate fixing tool shown in FIG. It is the schematic sectional drawing of the bridge girder which dismantles a part using the intermediate fixing tool shown in FIG. It is schematic cross-sectional view which shows the process of attaching the intermediate fixing tool shown in FIG. 1 to the intermediate part of a tension material. It is schematic cross-sectional view which shows the process of attaching the intermediate fixing tool shown in FIG. 1 to the intermediate part of a tension material. It is sectional drawing which shows the intermediate fixing tool which is another Embodiment of this invention. It is a schematic perspective view which shows the state before attaching to the tension material of the continuous fiber sheet used in the intermediate fixing tool shown in FIG. FIG. 3 is a schematic perspective view showing another example of a shape-retaining member that can be used in the intermediate fixing tool shown in FIG. It is a side view, a front view and a sectional view which show the intermediate fixing tool which is another Embodiment of this invention. It is a schematic development view of the continuous fiber sheet which can be used in the intermediate fixing tool shown in FIG. It is a schematic process diagram which shows the other use example of the intermediate fixing tool which concerns on this invention. It is a schematic process diagram which shows the other use example of the intermediate fixing tool which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view, a front view, and a cross-sectional view showing an intermediate fixing tool according to the present invention.
The intermediate fixing tool 1 is attached to the intermediate portion of the tension material 2 into which the tension force is introduced, and has a continuous fiber sheet 3 wound in a tubular shape around the tension material 2 and a tubular shape. The main part is composed of an end plate 4 provided so as to close the end portion of the continuous fiber sheet 3 and a filler 5 having an expandable property which is filled and hardened inside the tubular continuous fiber sheet 3. It is configured.

The continuous fiber sheet 3 has a predetermined width in the axial direction of the tension material 2, and has a length that can be wound around the tension material 2 at intervals to form a tubular shape. It is a sheet of fibers that are continuous in the direction. As the continuous fiber, aramid fiber, glass fiber, carbon fiber or the like can be used, and the continuous fiber is bundled in a sheet shape by weft threads (not shown) in the width direction. Such a continuous fiber sheet 3 is wound in a tubular shape around the tension material 2, and a large number of fibers are integrally hardened by impregnating the fibers with a synthetic resin, and the continuous fiber sheet 3 is wound and superposed. The layers of the fiber sheet 3 are firmly adhered with a synthetic resin to resist the expansion pressure acting on the inside of the tubular shape.

As shown in FIG. 2A, the continuous fiber sheet 3 is bundled into a sheet shape by weft threads (not shown) and flexibly deformed before being mounted around the tension material 2. A predetermined range at the end portion in the circumferential direction is a molded portion 3a, which is impregnated with a synthetic resin and molded so as to form a cylindrical curved surface. This molded portion has a predetermined inner diameter, and has a shape in which a part of the cylindrical shape in the circumferential direction is excluded along the axial direction. In the continuous fiber sheet 3 which is partially formed into a predetermined shape in this way, as shown in FIG. 2B, the tension material 2 is introduced inside from the region 3c where a part of the cylindrical shape is excluded. It can be arranged around the tension material 2, and as shown in FIG. 2C, the unmolded non-molded portion 3b can be wound around the molded portion 3a forming a cylindrical curved surface to form a tubular shape. It can be done.

The continuous fiber sheet partially formed in the circumferential direction is not limited to a shape in which a part of the cylindrical system is excluded as shown in FIG. 2, but has a cylindrical shape as shown in FIG. 3 (a). It is also possible to use a continuous fiber sheet 6 having molded portions 6b and 6c formed so that two shapes divided into two are connected in a row. The connecting portion 6a of the cylindrical curved surface divided into two is flexibly deformed, and the molded portions 6b and 6c formed into the two cylindrical curved surfaces can rotate with each other on both sides of the connecting portion 6a. It has become. In the continuous fiber sheet 6 partially molded in this way, as shown in FIG. 3 (b), the molded portions 6b and 6c divided into two are tensioned members in a state of being opened so that the inside is opened. It can be arranged around 2 and the two molded portions 6b, 6c can be closed to form a cylinder. The non-molded portion 6d can be wound around this to form a cylindrical shape continuous in the circumferential direction.
Further, the entire circumference of the cylinder is formed from the edge of the continuous fiber sheet so as to form one continuous cylindrical curved surface, and the tension material 2 is a cylinder with a part of the cylindrical curved surface pushed open by elastic deformation. It may be arranged so as to be inserted inside the shape.

The end plate 4 is used by abutting the members 4a and 4b divided into two, and as shown in FIG. 4, a plate-shaped portion 4c that becomes substantially circular when abutted and the plate-shaped portion 4c. It is provided with a flange portion 4d protruding from the peripheral edge of 4c in the axial direction of the tension member 2. A circular hole 4e through which the tension member 2 is inserted is provided in the central portion of the plate-shaped portion 4c. The dividing line 4f that divides the end plate 4 having such a shape into two is in the diameter direction of the plate-shaped portion 4c, and sandwiches the two divided members 4a and 4b from both sides of the tension member 2. By abutting them in this way so that the tension member 2 is inserted into the circular hole 4e, the tension member 2 can be mounted around the intermediate portion of the tension member 2.

Two sets of the end plates 4 are attached to the tension members 2 at predetermined positions before the continuous fiber sheets 3 and 6 are wound around, and both edges of the continuous fiber sheets 3 and 6 in the width direction are end plates. It is desirable to join the continuous fiber sheets 3 and 6 which are wound around the flange portion 4d of 4 to form a tubular shape.
Further, as shown in FIG. 4, the end plate 4 is provided with an injection port 4g of a filler so as to protrude from the plate-shaped portion 4c on one of the members 4a divided into two. The filler 5 is filled from the injection port 4g provided on one of the two sets of end plates 4, and the injection port 4g provided on the other end plate 4 is a tubular continuous fiber sheet 3, It can be used to discharge the gas taken into the inside of 6 and to confirm that the entire inside is filled with the filler.

As the expandable filler 5, a filler that is liquid or gel-like at the time of filling and expands at the time of curing after filling is used. For example, there are static crushing agents and similar materials (for example, "Exgripper" manufactured by Pacific Materials Co., Ltd.), expanded mortar, grout material containing aluminum powder, and the like. In addition, synthetic resins having expandability at the time of curing can also be used.

As shown in FIG. 1, a metal wire rod 7 is spirally wound around the outer peripheral surface of the continuous fiber sheet 3 which is wound in a cylindrical shape and integrated with the end plate 4, and is integrated with the continuous fiber sheet 3. It is adhered with a synthetic resin so as to be. As a result, a spiral convex portion is formed, and the tension material 2 functions as a stopper in the axial direction with respect to the concrete placed so as to embed the intermediate fixing tool 1.
The member spirally wound around the outer peripheral surface of the cylindrical continuous fiber sheet 3 may be a string-shaped member made of synthetic resin instead of the metal wire rod.

In such an intermediate fixing tool 1, even if the tensioning material 2 has both ends fixed to the structure by introducing a tensile force, the tensioning material 2 is attached to the intermediate portion of the tensioning material 2, and the arrow A shown in FIG. The tension material 2 pulled in the direction of the above can be fixed to the structure via the intermediate fixing tool 1. Therefore, behind the intermediate fixing tool 1, the tension force of the tension member 2 is released, and cutting and removal are possible. The member constituting the intermediate fixing tool 1 is lightweight, and the work of attaching the intermediate fixing member 2 to the intermediate portion can be efficiently performed.

Next, an example of releasing a part of the tension force of the tension material into which the tension force has been introduced will be described by using the intermediate fixing tool 1.
FIG. 5 is a schematic cross-sectional view showing an example in which a part of a bridge girder 20 made of prestressed concrete is removed by using the intermediate fixing tool 1 according to the present invention.
The bridge girder 20 has a plurality of main girders 21, and a lateral tightening tension member 23 is arranged in the width direction on the floor slab 22 supported by these main girders 21. The bridge girder 20 is to be replaced due to deterioration or the like, and about half of the bridge girder in the width direction is left to maintain traffic such as vehicles, and about half is removed and replaced with a new bridge girder. Then, when a new bridge girder is completed, traffic is switched to the new bridge girder, the first remaining part is removed, and this part is also replaced with a new bridge girder. In order to remove about half of the bridge girder 20 in the width direction, the tension of the lateral tightening tension material 23 is maintained at the remaining portion 20a, and the concrete is crushed and the tension of the lateral tightening tension material 23 is applied at the portion 20b to be removed. It will be released and disconnected.

Partial removal of the bridge girder can be done by the following process.
First, concrete is scraped at a substantially central portion in the width direction of the bridge girder 20 to expose the tension material 23. At this portion, as shown in FIG. 5A, the intermediate fixing tool 1 according to the present invention is attached to the tension member 23. To attach the intermediate fixing tool 1, as shown in FIG. 6A, the end plates 4a and 4b divided into two are attached to both sides of the tension member 23 at both ends of the range in which the intermediate fixing tool 1 is attached. The tension member 23 is arranged so as to be inserted into the circular hole so as to be abutted against each other. The continuous fiber sheet 3 is wound around the tension material 23, and is attached to the tension material 23 as shown in FIG. 6B as a tubular shape in which both ends in the axial direction are joined to the end plate 4. The gap between the circular hole of the end plate 4 and the tension member 23 is closed by a filling material or the like, and as shown in FIG. 7A, the injection port 4g-1 provided in one end plate 4 is provided. Inject liquid or gel filler from. It is confirmed that the filler is filled inside the continuous fiber sheet 3 which is formed into a tubular shape by discharging the filler from the injection port 4g-2 provided on the other end plate 4 and functioning as the discharge port. can do.

After the filler is hardened, as shown in FIG. 7B, the concrete 25 is driven back so as to embed the intermediate fixing tool 1 and integrated with the concrete of the portion 20a to be left. After the cast concrete 25 has hardened, as shown in FIG. 5B, the bridge girder of the portion 20b to be removed is crushed while the intermediate fixing tool 1 is maintained embedded in the concrete, and the tension material 23 is released. Disconnect. As a result, the tension force A introduced into the tension member 23 is transmitted to the concrete of the remaining portion 20a via the intermediate fixing tool 1, and the state in which the prestress in the width direction is introduced is maintained in the remaining portion.

FIG. 8 is a cross-sectional view showing an intermediate fixing tool according to another embodiment of the present invention.
Similar to the intermediate fixing tool 1 shown in FIGS. 1 and 2, the intermediate fixing tool 8 is obtained by winding a continuous fiber sheet 9 around an intermediate portion of the tension material 2 and end plates at both ends (in FIG. 8). The shape-retaining members 10a and 10b are arranged inside the continuous fiber sheet 9 in the intermediate fixing tool 8, and the continuous fiber sheet is flexibly deformed. 9 is wound around the shape-retaining members 10a and 10b to form a tubular shape.

The shape-retaining members 10a and 10b are formed by dividing a cylindrical member made of metal or synthetic resin into two by a cutting line in the axial direction, and when both are abutted to form a cylindrical shape, around the cylindrical member 10a and 10b. The wound continuous fiber sheet 9 can be maintained in a cylindrical shape.
The continuous fiber sheet 9 has such shape-retaining members 10a and 10b wound around the shape-retaining members 10a and 10b in a cylindrical shape, and is firmly adhered to the shape-retaining members 10a and 10b by an adhesive. Further, the cylindrical continuous fiber sheet 9 and the filler 5 filled inside the shape-retaining members 10a and 10b are in close contact with the shape-retaining members 10a and 10b, and the shape-retaining member is filled and cured. The inside of the shape-retaining members 10a and 10b may be provided with irregularities so that relative displacement with the 10a and 10b does not occur.

When the continuous fiber sheet 9 is wound in a cylindrical shape using the shape-retaining members 10a and 10b, as shown in FIG. 9, the end of the continuous fiber sheet 9 having a band shape on the outer peripheral surface of the shape-retaining members 10a and 10b Stick it on. The shape-retaining members 10a and 10b obtained by dividing the cylindrical shape into two are attached so as to be substantially continuous in the circumferential direction, and as shown in FIG. 9, the cylindrical shape is closed from an open state so as to open the inside. It shall be possible to put it in a state of being. As a result, the intermediate portion of the tension member 2 is brought close to the inside of the cylinder in the open state, and the shape-retaining members 10a and 10b divided into two are closed to form a cylinder in which the tension member 2 is inserted inside. be able to. Then, a continuously deformable continuous fiber sheet 9 can be wound around the cylindrical shape-retaining members 10a and 10b and hardened with an adhesive to form the continuous fiber sheet 9 into a cylindrical shape.
The axial end of the cylindrical continuous fiber sheet 9 can be closed by using an end plate 4 similar to that shown in FIG.

When the shape-retaining members 10a and 10b are used, the shape-retaining members 10a and 10b are not attached to the continuous fiber sheet 9, but the shape-retaining members 10a and 10b divided into two as shown in FIG. It may be assembled in a tubular shape using two end plates 4 divided into two, and a continuous fiber sheet may be wrapped around the tubular shape. At this time, the shape-retaining members 10a and 10b divided into two are abutted from both sides of the tension member 2 to form a tubular shape, and the tension member 2 is inserted inside, and the outer peripheral surface or the inner peripheral surface at the end in the axial direction is formed. The flanges 4d of the end plates 4a and 4b are brought into contact with each other. At this time, the dividing line 10c that divides the shape-retaining members 10a and 10b into two and the dividing line 4f that divides the end plates 4a and 4b into two are arranged so as to have different directions. Then, the shape-retaining members 10a and 10b and the end plates 4a and 4b can be joined to form a tubular shape by using an adhesive or the like.

The shape-retaining members 10a and 10b are formed by dividing a cylindrical shape into two parts having the same shape by a dividing line in the radial direction, but may be divided into two parts having different central angles. .. Further, instead of dividing into two, a cylindrical shape in which a part of the circumferential direction is continuously cut out in the length direction is used, and a tension material is used inside the shape-retaining member from this cutout part. May be introduced.

FIG. 11 is a side view, a front view, and a cross-sectional view showing an intermediate fixing tool according to another embodiment of the present invention.
In the intermediate fixing tool 1 shown in FIG. 1, the continuous fiber sheet 3 wound in a cylindrical shape has substantially the same diameter in the axial direction of the tension material 2, but in this embodiment, the continuous fiber sheet 3 wound in a cylindrical shape is continuously wound. It is assumed that the diameter of the fiber sheet 13 changes in the axial direction, and the diameter gradually increases in the direction in which the tension material 12 is pulled when the tension material 12 is fixed by the intermediate fixing tool 11, that is, in the direction indicated by the arrow A in FIG. It is supposed to be reduced to.
Even in such an intermediate fixing tool 11, the continuous fiber sheet 13 and the end plate 14 can be made of the same material and can be mounted in the same process, but in the axial direction of the tension member 12. The two end plates 14a and 14b used at both ends of the above have different diameters. Further, the continuous fiber sheet 13 can have a shape in which both side edges are curved as shown in FIG. 12 when a large number of fibers are arranged in the circumferential direction and bundled with weft threads.
The filler 15 can be cured by injecting the same filler as the intermediate fixing tool 1 shown in FIG. 1 in the same manner.

The intermediate fixing tool described above is an embodiment of the present invention, and the present invention is not limited thereto, and the shape, dimensions, materials, etc. may be changed within the scope of the present invention, and other forms may be used. Can be carried out at. Further, the use of the intermediate fixing tool of the present invention is not limited to the lateral tightening tension material of the bridge girder as shown in FIG. 5, and the tension arranged in the axial direction of the bridge girder as shown in FIGS. 13 and 14. It can also be used for materials.

In the usage examples shown in FIGS. 13 and 14, when the end of the bridge girder 31 made of prestressed concrete deteriorates over time and needs to be repaired, the tension of the tension member 32 is released only at the end of the girder. The intermediate fixing tool 41 was used to crush the end of the girder and place new concrete.
In such a usage example, as shown in FIG. 13, the concrete 33 around the tension material 32 is scraped at the remaining portion 31a of the bridge girder 31 to expose the tension material 32. Then, the intermediate fixing tool 41 of the present invention is attached to the tension member 32, and concrete is cast so as to embed the intermediate fixing tool 41 to integrate the intermediate fixing tool 41 with the remaining portion 31a of the bridge girder.
After the cast concrete is hardened, the bridge girder 31 is temporarily supported by the temporary support column 34 as shown in FIG. 14A, the concrete at the end 31b of the bridge girder is crushed and removed, and the end portion from the intermediate fixing tool 41 is removed. The portion of the tension material 32 where the tension is released is cut on the side. As shown in FIG. 14B, a new tension material 35 is connected to the cut tension material 32, and a new concrete 36 at the end of the girder is placed. Then, a tension force is introduced into the tension member 34 connected after curing to complete the repair of the bridge girder end portion.

1: Intermediate fixing tool, 2: Tension material, 3: Continuous fiber sheet, 4: End plate, 5: Filler, 6: Continuous fiber sheet, 7: Metal wire, 8: Intermediate fixing tool, 9: Continuous fiber Sheet, 10: Shape-retaining member,
11: Intermediate fixing tool, 12: Tension material, 13: Continuous fiber sheet, 14: End plate,
15: Filler, 17: Metal wire,
20: Bridge girder, 20a: Remaining part of bridge girder, 20b: Part to be removed from bridge girder, 21
: Main girder, 22: Floor slab, 23: Tension material, 25: Concrete to embed intermediate fixing tool,
31: Bridge girder, 32: Tension material, 33: Concrete scraped to expose the fixture,
34: Temporary support, 35: Newly connected tension material, 36: Concrete placed at the end of the girder, 41: Intermediate fixing tool

Claims (6)

A continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound around the tension material in a tubular shape.
A filler having an expandable property at the time of curing is filled between the continuous fiber sheet in a tubular shape and the tension material.
The filler is hardened between the tubular continuous fiber sheet with both ends closed and the tension material in a state where expansion is restrained by the continuous fiber sheet.
The filler and the continuous fiber sheet cured in a state where an expansion pressure is applied between the tension material and the tension material are fixed to the tension material.
An intermediate fixing tool characterized in that it is embedded in concrete cast so as to be in close contact with the outer peripheral surface of the continuous fiber sheet having a tubular shape. The intermediate fixing tool according to claim 1, wherein a convex portion is formed on the outer peripheral surface of the continuous fiber sheet wound in a tubular shape. The continuous fiber sheet wound in a tubular shape is intermediate between claims 1 and 2, wherein the wound outer diameter is reduced in a direction in which the tension material is pulled. Fixer. The invention according to any one of claims 1 to 3, wherein a shape-retaining member for maintaining the shape of the continuous fiber sheet is provided inside the continuous fiber sheet wound in a tubular shape. Intermediate fixing tool. A continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound around the tension material in a tubular shape.
Both ends of the tubular continuous fiber sheet are closed, and a filler having an expandable property at the time of curing is filled between the continuous fiber sheet and the tension material and cured.
Concrete is placed so as to be in close contact with the outer peripheral surface of the tubular continuous fiber sheet, and the tension material is fixed to the structure in which the concrete is hardened.
In the step of winding the continuous fiber sheet in a tubular shape around the tension material, a part of the winding direction of the continuous fiber sheet is formed into a curved shape so as to surround a part or the whole of the tension material. A method of mounting an intermediate fixing tool, which comprises winding a non-molded portion that is flexibly deformed around the molded portion and adhering it in a tubular shape. A continuous fiber sheet in which a plurality of fibers continuous in the circumferential direction are arranged is wound around the tension material in a tubular shape.
Both ends of the tubular continuous fiber sheet are closed, and a filler having an expandable property at the time of curing is filled between the continuous fiber sheet and the tension material and cured.
Concrete is cast so as to be in close contact with the outer peripheral surface of the tubular continuous fiber sheet, and the tension material is fixed to the structure in which the concrete is hardened.
In the step of winding the continuous fiber sheet in a tubular shape around the tension material, a shape-retaining member having a shape obtained by cutting the tubular member along the axially cut surface of the tubular member is formed by forming the fibers of the continuous fiber sheet. The feature is that the shape-retaining member is arranged in a tubular shape so as to surround the tension material in advance by adhering to the vicinity of one end in the direction, and the continuous fiber sheet is wound around the shape-retaining member. How to attach the intermediate fixing tool.

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