JP2019065605A - Repair method of PC structure - Google Patents

Abstract

To provide a repair method of a PC structure which can prevent the buckling of the PC structure at the time of repair of the PC structure and shorten the construction period.SOLUTION: A repair method of a PC structure formed by introducing prestress to concrete by tendon which comprises an installation process in which a reinforcing member 3 extended in the longitudinal direction of the tendon 8 is installed across a repair target area 20 which is an area from a one end 2a to the other end 2b in a material axial direction X in a part 2 to be repaired, a repairing process in which the concrete in the part 2 to be repaired is repaired, the crushed concrete is repaired by installing new concrete, and the part 2 to be repaired is repaired, and a removal process of removing the reinforcing member 3 after the new concrete placed in the repair process hardens.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of repairing a PC structure which is formed by introducing prestressing to concrete by tendon.

  The PC structure formed by introducing pre-stress to concrete with a tendon is concerned with deterioration of the concrete due to deterioration due to the passage of time and repeated load due to passage of a vehicle or the like. When concrete in a normal RC structure is deteriorated, it is repaired by pouring concrete on the portion to be repaired and then placing new concrete in the portion that is crawled. However, when concrete is deteriorated in the PC structure, although various methods for repairing the concrete have been proposed, it has not been established yet. In addition, if the PC structure is covered with degraded concrete, prestress that has been borne by the degraded concrete will be borne by the other concrete that has not been degraded, rebar, etc. Since an excessive stress acts more than that, buckling or the like of the PC structure may occur.

  Heretofore, as a technique related to the repair of a PC structure, a repair method of the PC structure disclosed in Patent Document 1 and a fixing device of a PC tendon disclosed in Patent Document 2 have been proposed.

  In the repair method of the PC structure disclosed in Patent Document 1, the concrete is scraped to expose the tendon passing through the repair target, the intermediate fixing tool is attached to the exposed tendon, and the end of the PC structure from the intermediate fixing tool The concrete is further removed to the part and new concrete is placed on the removed concrete. However, since the repair method of the PC structure disclosed in Patent Document 1 removes the concrete from the intermediate fixing tool to the end of the PC structure as well as the damaged portion, the area where the concrete is cut is As a result, there is a problem that the construction takes time.

  In the fixing device for PC tendon disclosed in Patent Document 2, two wedge members each having a slit are inserted between the PC steel strand wire and the inner periphery of the truncated cone tapered hole, and the PC steel member is made of PC steel The line is fixed in the middle. However, since the fixing device for the PC tendon disclosed in Patent Document 2 needs to remove the wire from the PC steel when repairing the PC structure, it takes a long time to remove the wire from the PC steel. There was a point.

Unexamined-Japanese-Patent No. 2015-085343 JP, 2011-184894, A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and it is possible to prevent the buckling of the PC structure at the time of repair of the PC structure, in the place where the objective is to repair the PC structure It is an object of the present invention to provide a repair method of a PC structure which makes it possible to shorten the

  A repair method of a PC structure according to a first aspect of the present invention is a repair method of a PC structure formed by introducing prestress to concrete by a tendon, the reinforcement member extending in the longitudinal direction of the tendon, Installation step across a repair target area which is an area from one end to the other end in a direction parallel to the longitudinal direction of the tendon in the repair target part to be repaired, and concrete in the repair target part A replacement step of placing new concrete in place of the above-mentioned concrete and repairing the portion to be repaired, and removing the reinforcing member after the new concrete placed in the repair step is hardened And providing a process.

  In the method of repairing a PC structure according to a second aspect of the present invention, in the first aspect, the reinforcing member is disposed to face the surface different from the surface on which the portion to be repaired is formed in the setting step. I assume.

  In the repair method of a PC structure according to a third invention, in the first invention or the second invention, in the installation step, fixing members for fixing the reinforcing member are attached on both sides across the repair target area, The reinforcing member is provided between each of the fixing members.

  In the repair method of a PC structure according to a fourth aspect of the present invention, in the first aspect or the second aspect of the present invention, in the installation step, using the PC structure having a projection provided in advance in a material axis orthogonal direction The reinforcing member may be installed between the projecting portions disposed on both sides of the area to be repaired.

  In the method of repairing a PC structure according to the fifth invention, in the first invention or the second invention, in the installation step, using the PC structure having a projecting portion provided in advance in the material axis orthogonal direction, A fixing member for attaching the reinforcing member is attached on the opposite side of the area to be repaired with the area where the projecting section is projected, and a fixing member is attached between the projecting section and the fixing member. The reinforcing member may be erected.

  In the method of repairing a PC structure according to the sixth invention, in any one of the first invention to the fifth invention, the PC structure is a box girder in which a space is formed inside, and in the installation step, the PC structure is The reinforcing member is disposed in a space inside the structure.

  In the repair method of a PC structure according to a seventh invention, in any one of the first invention to the sixth invention, in the installation step, a surface on which the repair target portion is formed and a surface on which the repair target portion is formed. The reinforcing member is disposed opposite to the rear surface of the housing.

  In the repair method of a PC structure according to an eighth invention, in any one of the first invention to the seventh invention, in the installation step, a pressing force is applied to the outside in the longitudinal direction of the reinforcing member. The reinforcing member may be installed.

  According to the present invention, the reinforcement member installed in the installation step is loaded with a compressive force by providing the installation step of installing the reinforcement member extended in the longitudinal direction of the tendon over the repair target area. It is possible to repair the repair target part by placing new concrete in place of crushed concrete. Therefore, according to the present invention, buckling of the PC structure can be prevented when repairing the PC structure.

  Further, according to the present invention, in the repair step, it is only necessary to go over only the damaged portion to be repaired, and the concrete is cut to the end of the PC structure as performed by the conventional repair method of the PC structure. It is possible to shorten the construction period by shortening the time for concrete turning work.

It is a perspective view of PC structure used for the repair method of PC structure to which the present invention is applied. It is a perspective view which expands and shows the repair object part in the PC structure of FIG. In the repair method of a PC structure to which the present invention is applied, (a) is a PC structure in which a reinforcement member is provided in each projecting portion provided in advance on both sides in the material axial direction across the repair target area. It is a side view showing, and (b) is a 3A-3A 'sectional view of (a). (A) is a side view which shows the PC structure which constructed the reinforcement member in each fixing member attached to the both sides of the material axial direction on both sides of a repair object area in the repair method of the PC structure to which the present invention is applied. FIG. 4B is a cross-sectional view taken along line 4A-4A ′ of FIG. (A) is a side view showing a PC structure in which a reinforcing member is erected on a projecting portion and a fixing member in a method of repairing a PC structure to which the present invention is applied, (b) is a 5A of (a) It is a -5A 'sectional view, (c) is 5B-5B' sectional view of (a). (A) is a cross-sectional view showing a PC structure provided with a tendon whose longitudinal direction is the material axis orthogonal direction Y in the repair method of a PC structure to which the present invention is applied, (b) is this It is a top view of PC structure. It is a perspective view showing the PC structure where the box girder was used in the repair method of the PC structure to which the present invention is applied. In the repair method of a PC structure to which the present invention is applied, a PC structure is shown as a box girder in which reinforcing members are provided in the respective projecting portions provided in advance on both sides in the material axial direction across the repair target area. It is side surface sectional drawing, (b) is 8A-8A 'sectional drawing of (a). (A) is a side sectional view showing a PC structure as a box girder in which a reinforcing member is erected on each projecting portion provided in advance in the method for repairing a PC structure to which the present invention is applied, b) is a side sectional view showing a PC structure as a box girder in which a reinforcing member is installed on each fixing member in the method for repairing a PC structure to which the present invention is applied. In the repair method of the PC structure to which the present invention is applied, it is a side sectional view showing the PC structure provided with a tendon as an outer cable.

  Hereinafter, an embodiment for carrying out a method for repairing a PC structure to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a PC structure 1 used in a method of repairing a PC structure to which the present invention is applied. FIG. 2 is an enlarged perspective view showing a portion 2 to be repaired in the PC structure 1 of FIG.

  The repair method of the PC structure to which the present invention is applied is applied to the PC structure 1 which is formed by introducing prestress to concrete by the tendon 8.

  As shown in FIG. 1, the PC structure 1 is a concrete girder member having a substantially T-shaped cross section, in which a tendon 8 extending in the longitudinal direction of the material axial direction X is disposed in the concrete. There is. The PC structure 1 is used in a bridge or the like, and a plurality of PC structures 1 are arranged in the material axis orthogonal direction Y and mounted on a bridge lower structure such as a bridge pier or abutment not shown. Here, the longitudinal direction of the PC structure 1 is taken as the material axis direction X, the direction intersecting horizontally with the material axis direction X is taken as the material axis orthogonal direction Y, and the direction perpendicular to the material axis orthogonal direction Y is taken as the height direction Z Do. The PC structure 1 is not limited to the girder material, and may be a PC floor slab, for example, as long as it is formed by introducing prestress to concrete by a tendon.

  The PC structure 1 is manufactured in a factory or the like, and prestress is introduced to concrete. The PC structure 1 may be one in which the introduced prestress is introduced by the pretension method, or may be one introduced by the post tension method. In the PC structure 1, prestress is introduced in the material axial direction X by the tendon 8.

  The PC structure 1 is provided with a projecting portion 9 made of concrete, which is provided in advance in the material axis orthogonal direction Y at both end portions 1a and 1b and the intermediate portion 1c in the material axial direction X. The projecting portion 9 is a so-called cross girder, and concrete is cast between a plurality of PC structures 1 adjacent in the material axis orthogonal direction Y, so that a plurality of pieces adjacent in the material axis orthogonal direction Y These PC structures 1 are connected to each other.

  If damage has occurred due to aging due to the passage of years, repeated loading due to the passage of vehicles, etc., the PC structure 1 is removed as the repair target part 2 to be actually repaired, Concrete needs to be placed and repaired.

  The PC structure 1 according to the present embodiment will be described in the case where the repair target portion 2 is formed on the bottom surface 11, but in the PC structure according to the present invention, the repair target portion 2 is formed on the upper surface 12, the side surface 13, etc. It may be

  The PC structure 1 has a repair target area 20 which is an area from one end 2 a to the other end 2 b in the material axial direction X parallel to the longitudinal direction of the tendon 8 in the repair target unit 2. That is, the repair target area 20 includes an imaginary line 20 a cut perpendicularly to the material axial direction X so as to include one end 2 a of the repair target unit 2 in the material axial direction X, and the material axial direction of the repair target 2 It is an area between a virtual line 20b cut perpendicularly to the material axial direction X so as to include the other end 2b of X.

  Next, the repair method of the PC structure to which the present invention is applied will be described.

  FIG. 3A is a method of repairing a PC structure to which the present invention is applied, in which each of the projecting portions 9 and 9 which are provided in advance on both sides in the material axial direction X across the repair target area 20 is reinforced. It is a side view showing PC structure 1 which installed 3 and Drawing 3 (b) is a 3A-3A 'sectional view of Drawing 3 (a).

  The method of repairing a PC structure to which the present invention is applied includes: installing the reinforcement member 3 extended in the material axial direction X parallel to the longitudinal direction of the tendon 8 straddling the repair target area 20; Repairing the concrete in the repair target part 2 and replacing the crushed concrete with new concrete, and repairing the repair target part 2. After the new concrete cast in the repair process hardens, And a removing step of removing the reinforcing member 3.

  The reinforcing member 3 is configured to be extensible and contractible in the material axial direction X of the PC structure 1. The reinforcing member 3 has a jack 31 configured to be extensible and retractable, and a rod-like member 32 attached to the jack 31. The longitudinal direction of the rod-like member 32 is extended in the material axial direction X, and a steel, concrete, steel, concrete-made composite member or the like is used.

  In this embodiment, although the reinforcement member 3 demonstrates the form to which the jack 31 is attached to the one end side of the rod-shaped member 32, although illustration is abbreviate | omitted in this invention, the reinforcement member 3 is both ends of the rod-shaped member 32. The jacks 31 may be attached to the side, or the rod-like members 32 may be attached to both ends of the jacks 31, respectively. Further, in the present invention, the reinforcing member 3 may be configured by only the rod-like member 32 with the configuration of the jack 31 omitted, or the configuration with the rod-like member 32 may be omitted. It may be composed of

  In the installation step, first, the reinforcing member 3 is constructed between the projecting portions 9 disposed on both sides of the area 20 to be repaired. In this installation step, the reinforcing member 3 is bridged between the end portions 1 a of the PC structure 1 in the material axial direction X and the respective protruding portions 9 which are provided in a protruding manner in the middle portion 1 c. At this time, in the PC structure 1, since the protruding portions 9, 9 are respectively disposed on both sides of the repair target area 20 in the material axial direction X, the reinforcing member 3 is interposed between the protruding portions 9, 9. The reinforcement member 3 extended in the longitudinal direction of the tendon 8 is installed straddling the area 20 to be repaired.

  Further, in the installation step, the reinforcing member 3 is installed to face the surface different from the surface on which the repair target portion 2 is formed. That is, in this embodiment, in the installation step, since the repair target portion 2 is formed on the bottom surface 11 of the PC structure 1, the reinforcing member 3 is disposed to face the side surface 13 of the PC structure 1.

  In the installation step, the reinforcing member 3 may be installed opposite to the surface on which the repair target portion 2 is formed. At this time, in the installation step, when the repair target portion 2 is formed on the bottom surface 11 of the PC structure 1, the reinforcing member 3 may be disposed to face the bottom surface 11 of the PC structure. When the repair target portion 2 is formed on the side surface 13 of the object 1, the reinforcing member 3 may be disposed to face the side surface 13 of the PC structure 1.

  In the installation step, the reinforcing members 3 are respectively disposed on both sides of the PC structure 1 with the PC structure 1 interposed therebetween.

  When installing the reinforcing member 3 in the installation step, the jack 31 of the reinforcing member 3 is extended in the material axial direction X to bring the jack 31 into contact with the projecting portion 9 provided on the end portion 1 a of the PC structure 1 At the same time, the rod-like member 32 is brought into contact with the projecting portion 9 provided in the middle portion 1c of the PC structure 1, and the reinforcing member 3 is installed. In addition, when installing the reinforcing member 3 in the installation step, the reinforcing member 3 is pressed against the projecting portion 9 by extending the jack 31 in the longitudinal direction of the reinforcing member 3 and a pressing force is applied to the reinforcing member 3 In the state, the reinforcing member 3 may be installed.

  Next, in the repair process, first, concrete in the repair target unit 2 is milled to a predetermined depth by an electric breaker, a water jet, or the like. At this time, it may be entirely covered in the depth direction from the surface of the concrete in the portion 2 to be repaired, or may be partially covered in the depth direction from the surface of the concrete in the portion 2 to be repaired.

  In the repair step, by carrying out the work of rolling concrete in the portion 2 to be repaired, the prestress (compressive force) imposed on the portion 2 to be repaired is borne by the reinforcing member 3 installed in the installation step. Then, in the repair process, in a state in which the reinforcing member 3 installed in the installation process bears a compressive force, the concrete to be repaired is replaced with crushed concrete and the repair target part 2 is repaired.

  Next, in the removal process, after the new concrete casted in the repair process is hardened, the reinforcing member 3 is removed. With regard to removal of the reinforcing member 3, the jack 31 and the rod-like member 32 are separated from the projecting portion 9 by retracting the jack 31 in the material axial direction X, and the reinforcing member 3 is removed.

  In the removal step, by removing the reinforcing member 3, the compressive force which has been borne by the reinforcing member 3 can be borne by the new concrete which is placed and hardened in the repair step, and the hardened new concrete is Prestress can be introduced.

  The repair method of the PC structure to which the present invention is applied includes the installation step of installing the reinforcement member 3 extended in the longitudinal direction of the tendon member 8 across the repair target area 20, whereby the reinforcement installed in the installation step In a state in which the member 3 bears a compressive force, it is possible to replace the crushed concrete and place new concrete to repair the repair target portion 2. Therefore, the repair method of the PC structure to which the present invention is applied can prevent the buckling of the PC structure 1 when the PC structure 1 is repaired.

  The repair method of the PC structure to which the present invention is applied is that the end of the PC structure which is performed by the conventional repair method of the PC structure only needs to cover only the damaged portion 2 to be repaired in the repair process. It is not necessary to cut the concrete up to the above, and the area for covering the concrete can be reduced, so the time for the concrete rolling work can be shortened, and the construction period can be shortened.

  The repair method of the PC structure to which the present invention is applied omits the work of installing the intermediate fixing tool attached to the tendon for introducing a new prestress used in the repair method of the conventional PC structure. Since the repair target portion 2 can be repaired, the construction period can be shortened.

  In the method of repairing a PC structure to which the present invention is applied, the reinforcing members 3 are provided to the respective projecting portions 9 of the PC structure 1 provided in advance on both sides in the material axial direction X across the repair target area 20. In order to erect, it becomes possible to install easily reinforcement member 3 which bears compression power in a repair process, and as a result, it becomes possible to shorten a construction period.

  In the repair method of the PC structure to which the present invention is applied, by using the reinforcing member 3 which can extend and contract in the material axial direction X, the work of installing the reinforcing member 3 in the installation step and the removing of the reinforcing member 3 in the removing step Can be performed easily, and as a result, the construction period can be shortened.

  In the repair method of the PC structure to which the present invention is applied, the reinforcement member 3 used in the repair of the repair target portion 2 in the PC structure 1 is removed by removing the reinforcement member 3 in the removal step. When repairing the repair target unit 2 or when repairing the repair target unit 2 in another PC structure 1, the construction cost can be reduced because it can be diverted.

  Further, in the repair method of the PC structure to which the present invention is applied, the reinforcing member 3 is installed between the projecting portions 9 in a state where the pressing force is applied in the longitudinal direction of the reinforcing member 3 in the installation step. That is, since the pressing force is applied to the reinforcing member 3, a force is exerted such that both the projecting portions 9 are separated from each other on both sides in the material axial direction X. Therefore, in the repair method of the PC structure to which the present invention is applied, when the reinforcing member 3 is removed in the removing step, the forces acting on both the projecting portions 9, 9 try to return in the direction approaching each other. As a result, it is possible to introduce a large prestress to new concrete that has been placed and hardened in the repair process.

  In the repair method of the PC structure to which the present invention is applied, the reinforcing member 3 is installed to face the surface different from the surface on which the repair target portion 2 is formed in the installation process. That is, in the repair method of the PC structure to which the present invention is applied, the reinforcing member 3 is not disposed to face the surface on which the repair target portion 2 is formed in the installation step. It is possible to easily carry out these operations without the hindrance by the reinforcing member 3 of the work of placing new concrete on the crushed concrete or the work of laying the new concrete, and as a result, the construction period can be shortened. It becomes possible.

  FIG. 4A is a method of repairing a PC structure to which the present invention is applied, in which the reinforcing member 3 is constructed on each of the fixing members 4 attached to both sides in the material axial direction X across the repair target area 20. It is a side view showing PC structure 1, and Drawing 4 (b) is a 4A-4A 'sectional view of Drawing 4 (a).

  The PC structure 1 is connected to another PC structure 1 adjacent in the material axis orthogonal direction Y via a concrete interposing portion 91.

  As the fixing member 4, a fixing member made of steel, concrete, steel or concrete is used as a fixing member for fixing the reinforcing member 3. The fixing member 4 is disposed so as to protrude in the material axis orthogonal direction Y of the PC structure 1 and is attached to both side surfaces 13 and 13 of the PC structure 1.

  In the repair method of the PC structure to which the present invention is applied, in the installation step, the fixing members 4 for fixing the reinforcing member 3 on both sides across the repair target area 20 are side surfaces 13 of the PC structure 1. The reinforcing members 3 are mounted between the fixing members 4 and 4 respectively. In addition, when installing the reinforcing member 3 in the installation step, the reinforcing member 3 is pressed against the fixing member 4 by extending the jacks 31 in the longitudinal direction of the reinforcing member 3, and a pressing force is applied to the reinforcing member 3. Then, the reinforcing member 3 may be installed between the fixing members 4.

  For example, in the case of using concrete as the fixing member 4, the fixing member 4 is installed by installing a mold having a predetermined size on the side surface 13 of the PC structure 1 and placing concrete in the mold. And the fixing member 4 is attached to the side surface 13.

  The fixing member 4 is not limited to this, and the side surface 13 of the PC structure 1 is drilled by a drill, a water jet, a long bit drill or the like, and the bolt as the fixing member 4 in the drilled hole, PC The fixing member 4 may be attached to the side surface 13 by inserting a steel material, a urbon material, or the like. Further, in the fixing operation of the fixing member 4, when the drilling operation is not performed, the fixing member 4 may be attached to the side surface 13 by driving an anchor as the fixing member 4 into the side surface 13.

  Although the fixing member 4 is attached to the side surface 13 of the PC structure in the embodiment shown in FIG. 4, the present invention is not limited to this, and the fixing member 4 may be attached to the bottom surface 11 or the top surface 12 of the PC structure. Good.

  The repair method of the PC structure to which the present invention is applied is particularly reinforced when the reinforcing member 3 is constructed over the respective fixing members 4 attached to both sides in the material axial direction X across the area 20 to be repaired. Since the length in the material axial direction X of the member 3 is sufficient for the length between each of the fixing members 4 and 4 to be erected, the reinforcing member 3 is erected on each projecting portion 9 of the PC structure 1 The length in the material axial direction X of the reinforcing member 3 can be made shorter than in the case where it is the case, and the construction cost can be further reduced.

  In the removing method, the fixing member 4 may be removed according to the removal of the reinforcing member 3 in the removing step, or the fixing member 4 may be removed by removing only the reinforcing member 3. May be left on the PC structure 1.

  FIG. 5A is a side view showing the PC structure 1 in which the reinforcing member 3 is installed between the projecting portion 9 and the fixing member 4 in the repair method of the PC structure to which the present invention is applied. (B) is 5A-5A 'sectional drawing of Fig.5 (a), FIG.5 (c) is 5B-5B' sectional drawing of Fig.5 (a).

  In the repairing method of the PC structure to which the present invention is applied, the projecting portion 9 is protruded by using the PC structure 1 having the projecting portion 9 which is provided in advance in the material axis orthogonal direction Y in the installation step. The fixing member 4 for attaching the reinforcing member 3 is attached to the opposite side of the projecting portion 9 with the repair target area 20 in between and the reinforcing member 3 is bridged between the projecting portion 9 and the fixing member 4. Further, when installing the reinforcing member 3 in the installation step, the reinforcing member 3 is pressed against the projecting portion 9 and the fixing member 4 by extending the jacks 31 in the longitudinal direction of the reinforcing member 3 and pressing the reinforcing member 3 The reinforcing member 3 may be installed between the projecting portion 9 and the fixing member 4 in a state where pressure is applied.

  In the repair method of the PC structure to which the present invention is applied, in particular, when the reinforcing member 3 is installed between the protruding portion 9 and the fixing member 4, only the fixing member 4 on one side is installed in the installation step. The construction can be simplified as compared with the case where the reinforcing members 3 are mounted on the respective fixing members 4 and 4 attached on both sides in the material axial direction X across the area 20 to be repaired. It becomes possible to reduce construction costs.

  In the repair method of the PC structure to which the present invention is applied, in particular, when the reinforcing member 3 is bridged between the protruding portion 9 and the fixing member 4, the length of the reinforcing member 3 in the material axial direction X Since the length between the installation portion 9 and the fixing member 4 is sufficient, the length in the material axial direction X of the reinforcing member 3 is longer than in the case where the reinforcing member 3 is erected on the projecting portions 9 and 9 of each PC structure 1 Can be shortened, and construction costs can be further reduced.

  FIG. 6A is a cross-sectional view showing a PC structure 1 provided with a tendon 81 whose longitudinal direction is the material axis orthogonal direction Y in the method of repairing a PC structure to which the present invention is applied. (B) is a top view of this PC structure 1.

  In the PC structure 1, prestress is introduced in the material axial direction X by the tendon 8. Further, the PC structure 1 is connected to another PC structure 1 adjacent in the material axis orthogonal direction Y via a concrete interposing portion 91. In the PC structure 1 and the stuffed portion 91 adjacent to each other, a tendon 81 whose longitudinal direction is the material axis orthogonal direction Y is disposed. As a result, the PC structure 1 is one in which prestress is introduced also in the material axis orthogonal direction Y.

  In the PC structure 1 according to the embodiment shown in FIG. 6, the repair target unit 2 includes the upper surfaces 12 and 12 of the PC structures 1 and 1 adjacent to each other in the material axis orthogonal direction Y, and the PC structures 1 and 1. Are formed in interspaces 91 connecting the two to each other.

  The PC structure 1 includes a repair target area 20, which is an area from one end 2a to the other end 2b in the material axial direction X parallel to the longitudinal direction of the tendon 8 in the repair target unit 2, and the repair target 2 There is a repair target area 21 which is an area from one end 2c to the other end 2d in the material axis orthogonal direction Y parallel to the longitudinal direction of the tendon 81 in. That is, the repair target area 20 includes an imaginary line 20 a cut perpendicularly to the material axial direction X so as to include one end 2 a of the repair target unit 2 in the material axial direction X, and the material axial direction of the repair target 2 It is an area between a virtual line 20b cut perpendicularly to the material axial direction X so as to include the other end 2b of X. Further, this repair target area 21 is a virtual line 21 c vertically cut with respect to the material axis orthogonal direction Y so as to include one end 2 c of the repair target unit 2 in the material axis orthogonal direction Y, and the material of the repair target unit 2 It is an area between a virtual line 20d vertically cut with respect to the material axis orthogonal direction Y so as to include the other end 2d in the axis orthogonal direction Y.

  As the reinforcing member 3 installed across the repair target area 21, a member that can expand and contract in the material axis orthogonal direction Y is used.

  In the repairing method of the PC structure to which the present invention is applied, each fixing member 4 for fixing the reinforcing member 3 on both sides of the repair target area 20 in the installation step is the upper surface 12 of the PC structure 1. The reinforcing members 3 are mounted between the fixing members 4 and 4 respectively. In addition, when installing the reinforcing member 3 in the installation step, the reinforcing member 3 is pressed against the fixing member 4 by extending the jacks 31 in the longitudinal direction of the reinforcing member 3, and a pressing force is applied to the reinforcing member 3. Then, the reinforcing member 3 may be installed between the fixing members 4.

  Further, in the repair method of the PC structure to which the present invention is applied, in the installation step, the fixing members 4 for fixing the reinforcing member 3 are provided on both sides of the repair target area 21 as the PC structure 1. The reinforcing members 3 are mounted between the fixing members 4 and 4 respectively attached to the upper surface 12. In addition, when installing the reinforcing member 3 in the installation step, the reinforcing member 3 is pressed against the fixing member 4 by extending the jacks 31 in the longitudinal direction of the reinforcing member 3, and a pressing force is applied to the reinforcing member 3. Then, the reinforcing member 3 may be installed between the fixing members 4.

  The repair method of the PC structure to which the present invention is applied is particularly reinforced when the reinforcing member 3 is constructed over the respective fixing members 4 attached to both sides in the material axial direction X across the area 20 to be repaired. The length in the material axial direction X of the reinforcing member 3 can be shortened because the length in the material axial direction X of the member 3 is sufficient with the length between each of the fixing members 4 and 4 installed. It becomes possible to reduce construction costs.

  In the repair method of the PC structure to which the present invention is applied, in particular, when the reinforcing member 3 is constructed over the fixing members 4 and 4 attached on both sides of the material axis orthogonal direction Y across the repair target area 21, The length of the reinforcing member 3 in the material axis orthogonal direction Y may be shortened because the length of the reinforcing member 3 in the material axis orthogonal direction Y is sufficient for the length between the fixing members 4 and 4 to be bridged. It is possible to reduce the construction cost more.

  Thus, the repair method of the PC structure to which the present invention is applied is the PC structure 1 in which the tendon 8 extended in the material axis direction X and the tendon 81 extended in the material axis orthogonal direction Y are disposed. Can also be applied.

  In the removing method, the fixing member 4 may be removed according to the removal of the reinforcing member 3 in the removing step, or the fixing member 4 may be removed by removing only the reinforcing member 3. May be left on the PC structure 1.

  In addition, although the illustration is abbreviate | omitted, the repair method of the PC structure to which this invention is applied is the bottom face 11 which is the back of the upper surface 12 in which the repair object part 2 is formed, and the upper surface 12 in which the repair object part 2 is formed The reinforcing member 3 may be installed opposite to the lower surface 16.

  FIG. 7 is a perspective view showing a PC structure 1 in which a box girder is used in the method of repairing a PC structure to which the present invention is applied.

  The PC structure 1 uses a box girder having an outer surface 10 constituted by a bottom surface 11, a top surface 12 and a side surface 13 and an inner surface 14 surrounding an internal space 15. The PC structure 1 is such that the tendon 8 is disposed in the concrete. In the PC structure 1, the repair target portion 2 is formed on the bottom surface 11 of the outer surface 10.

  FIG. 8 is a method of repairing a PC structure to which the present invention is applied, in which the reinforcing member 3 is erected on the respective projecting portions 9, 9 which are provided in advance on both sides in the material axial direction X across the repair target area 20. It is a side view showing PC structure 1 as a box girder which was carried out, and Drawing 8 (b) is an 8A-8A 'sectional view of Drawing 8 (a).

  The PC structure 1 has projecting portions 9 provided in the material axis orthogonal direction Y at both end portions 1 a and 1 b in the material axial direction X. The projecting portion 9 is a so-called cross beam.

  In the method of repairing a PC structure to which the present invention is applied, in the installation step, first, the reinforcing members 3 are bridged between the projecting portions 9 disposed on both sides of the area 20 to be repaired. In this installation step, the jack 31 of the reinforcing member 3, the rod member 32 and the stiffener 33 are installed in the space 15 inside the PC structure 1. In the installation step, buckling of the reinforcing member 3 can be prevented by installing a stiffener 33 such as a jack extended in the material axis orthogonal direction Y and the height direction Z in the internal space 15. .

  In the method of repairing a PC structure to which the present invention is applied, in the installation step, first, the reinforcing members 3 are bridged between the projecting portions 9 disposed on both sides of the area 20 to be repaired. In this installation step, the reinforcing member 3 is bridged between the projecting portions 9, 9 projecting from both end portions 1a, 1b of the PC structure 1 in the material axial direction X. At this time, in the PC structure 1, since the projecting portions 9, 9 are disposed on both sides in the material axial direction X across the repair target area 20, the reinforcing member 3 is interposed between the projecting portions 9, 9. By erecting, the reinforcing member 3 extended in the longitudinal direction of the tendon 8 is installed across the repair target area 20.

  The repair method of the PC structure to which the present invention is applied includes the installation step of installing the reinforcement member 3 extended in the longitudinal direction of the tendon member 8 across the repair target area 20, whereby the reinforcement installed in the installation step In a state in which the member 3 bears a compressive force, it is possible to replace the crushed concrete and place new concrete to repair the repair target portion 2. Therefore, the repair method of the PC structure to which the present invention is applied can prevent the buckling of the PC structure 1 when the PC structure 1 is repaired.

  Further, in the repair method of the PC structure to which the present invention is applied, it is only necessary to scan only the damaged portion 2 to be repaired in the repair step, and it is possible to use the PC structure as in the conventional repair method of the PC structure. There is no need to cut the concrete down to the end, and the area for covering the concrete can be reduced, so the time for the concrete rolling work can be shortened and the construction period can be shortened. .

  In the present embodiment, in the installation step, when the portion 2 to be repaired is formed on the outer surface 10 of the PC structure 1, the reinforcing member 3 is disposed to face the inner surface 14 of the PC structure 1. Therefore, in the repair method of the PC structure to which the present invention is applied, since the reinforcing member 3 is not disposed to face the surface on which the repair target portion 2 is formed in the installation step, the concrete in the repair target portion 2 is It becomes possible to easily carry out these operations without the hindrance by the reinforcing member 3 and the operation of putting new concrete into the crushed concrete, so that the construction period can be shortened. Is possible.

  Further, according to the repair method of the PC structure to which the present invention is applied, by installing the reinforcing member 3 in the space 15 inside the PC structure 1, the reinforcing member 3 does not fall below the PC structure 1. It becomes possible to construct safely.

  FIG. 9A is a method of repairing a PC structure to which the present invention is applied, in which each of the projecting portions 91, 91 which are provided in advance and provided on both sides in the material axial direction X across the repair target area 20 is a reinforcing member. It is a side sectional view showing PC structure 1 as a box girder which erected three. Although the tendon 8 is omitted in FIG. 9A, it is assumed that the tendon 8 is extended with the material axial direction X as the longitudinal direction.

  The PC structure 1 is provided in advance in the internal space 15 with the protrusion 91 as an intermediate partition at a predetermined interval in the material axis direction X. The projecting portion 91 as an intermediate partition is provided to resist the cross-sectional deformation of the PC structure 1.

  In the method of repairing a PC structure to which the present invention is applied, in the installation step, the reinforcing members 3 are constructed between the respective projecting portions 91, 91 disposed on both sides across the repair target area 20. The reinforcement member 3 extended in the longitudinal direction of the above is installed across the repair target area 20.

  The repair method of the PC structure to which the present invention is applied includes the installation step of installing the reinforcement member 3 extended in the longitudinal direction of the tendon member 8 across the repair target area 20, whereby the reinforcement installed in the installation step In a state in which the member 3 bears a compressive force, it is possible to replace the crushed concrete and place new concrete to repair the repair target portion 2. Therefore, the repair method of the PC structure to which the present invention is applied can prevent the buckling of the PC structure 1 when the PC structure 1 is repaired.

  Further, in the repair method of the PC structure to which the present invention is applied, it is sufficient to only scratch the damaged portion 2 to be repaired in the repair step, and the area over which the concrete can be reduced can be reduced. The work time can be shortened, and the construction period can be shortened.

  FIG. 9 (b) is a method of repairing a PC structure to which the present invention is applied, in which the reinforcing member 3 is constructed over the respective fixing members 4 attached to both sides in the material axial direction X across the repair target area 20. It is side surface sectional drawing which shows PC structure 1 as a box girder. Although the tendon 8 is omitted in FIG. 9 (b), it is assumed that the tendon 8 is extended with the material axial direction X as the longitudinal direction.

  In the repair method of the PC structure to which the present invention is applied, each fixing member 4 for fixing the reinforcing member 3 on both sides of the repair target area 20 in the installation step is an inner surface 14 of the PC structure 1. The reinforcing members 3 are mounted between the fixing members 4 and 4 respectively.

  The repair method of the PC structure to which the present invention is applied includes the installation step of installing the reinforcement member 3 extended in the longitudinal direction of the tendon member 8 across the repair target area 20, whereby the reinforcement installed in the installation step In a state in which the member 3 bears a compressive force, it is possible to replace the crushed concrete and place new concrete to repair the repair target portion 2. Therefore, the repair method of the PC structure to which the present invention is applied can prevent the buckling of the PC structure 1 when the PC structure 1 is repaired.

  Further, in the repair method of the PC structure to which the present invention is applied, it is sufficient to only scratch the damaged portion 2 to be repaired in the repair step, and the area over which the concrete can be reduced can be reduced. The work time can be shortened, and the construction period can be shortened.

  FIG. 10 is a side sectional view showing the PC structure 1 provided with the tendon 8 as the outer cable in the method of repairing the PC structure to which the present invention is applied.

  The PC structure 1 has a tension member 8 as an outer cable provided in the internal space 15, and a projecting portion 92 as a fixing portion for fixing the tension member 8 and a deflection member 8 by deflecting the tension member 8. And a projecting portion 93 as a deflecting portion for disposing. The projecting portion 92 and the projecting portion 93 are projected in advance in the material axis orthogonal direction Y from the inner surface 14 of the PC structure 1. The PC structure 1 is not limited to the one in which the tendon 8 as the outer cable is provided in the internal space 15, but may be provided on the outer surface 10 side.

  In the repairing method of the PC structure to which the present invention is applied, the projecting portions 92 and 93 are formed using the PC structure having the projecting portions 92 and 93 which are provided in advance in the material axis orthogonal direction Y in the installation step. The fixing member 4 for attaching the reinforcing member 3 is attached to the opposite side of the projecting portions 92 and 93 across the area 20 to be repaired on the surface to be projected. Then, in the installation step, the reinforcing member 3 is provided between the projecting portion 92 and the fixing member 4 and between the projecting portion 93 and the fixing member 4, and the reinforcing member is extended in the longitudinal direction of the tendon 8. 3 is installed across the repair target area 20.

  Although not shown, the method of repairing a PC structure to which the present invention is applied is a reinforcing member between the projecting portions 92 disposed on both sides of the area 20 to be repaired in the installation step. 3 may be erected, and the reinforcement member 3 extended in the longitudinal direction of the tendon 8 may be installed straddling the area 20 to be repaired. Moreover, although illustration is abbreviate | omitted, the repair method of the PC structure to which this invention is applied is a reinforcement member between each projecting part 93, 93 arrange | positioned on both sides across the area 20 for repair in an installation process. 3 may be erected, and the reinforcement member 3 extended in the longitudinal direction of the tendon 8 may be installed straddling the area 20 to be repaired.

  The method of repairing a PC structure to which the present invention is applied includes the step of installing the longitudinal reinforcing member 3 of the tendon 8 across the area 20 to be repaired, thereby compressing the reinforcing member 3 installed in the installing step. It is possible to repair the repair target portion 2 by putting new concrete in place of the crushed concrete in a state where the force is paid. Therefore, the repair method of the PC structure to which the present invention is applied can prevent the buckling of the PC structure 1 when the PC structure 1 is repaired.

  The repair method of the PC structure to which the present invention is applied is that in the repair process, only the damaged repair target part 2 needs to be covered, and the area for covering concrete can be reduced. The time can be shortened, and the construction period can be shortened.

  In the embodiment described above, although the embodiment in which the tension member 8 as the outer cable is provided to the PC structure 1 as the box girder has been described, the PC structure 1 as the girder member having a substantially T-shaped cross section is A tendon 8 may be provided as a cable.

  As mentioned above, although the example of the embodiment of the present invention was explained in detail, any of the above-mentioned embodiments only shows the example of the embodiment in the case of carrying out the present invention. The scope should not be interpreted in a limited manner.

1: PC structure 1a: end 1b: end 1c: middle 10: outer surface 11: bottom 12: upper surface 13: upper surface 13: side 14: inner surface 15: space 2: repair target portion 2a: end 2b: end 20: Repair target area 21: Repair target area 3: Reinforcement member 31: Jack 32: Bar member 33: Stiffener 4: Fixing member 8: Tendon member 9: Protruding part 91: Protruding part 92: Protruding part 93: Protrusion Setting portion 99: Spacing portion X: Material axial direction Y: Material axial orthogonal direction Z: Height direction

Claims (8)

A method of repairing a PC structure formed by introducing prestress to concrete by tendon,
The reinforcement member extended in the longitudinal direction of the tendon is installed straddling the repair target area which is an area from one end to the other end in a direction parallel to the longitudinal direction of the tendon at the portion to be repaired Installation process,
Repairing the concrete in the part to be repaired, replacing it with the concrete, pouring new concrete, and repairing the part to be repaired;
A method for repairing a PC structure, comprising: a removing step of removing the reinforcing member after the new concrete casted in the repairing step is hardened. The method for repairing a PC structure according to claim 1, wherein the reinforcing member is installed to face the surface different from the surface on which the portion to be repaired is formed in the installing step. In the installation step, fixing members for fixing the reinforcing members are attached on both sides of the area to be repaired, and the reinforcing members are bridged between the fixing members. Or 2 the repair method of the PC structure of statement. In the installation step, using the PC structure having a projecting portion provided in advance in the material axis orthogonal direction, the PC structure between the projecting portions arranged on both sides across the repair target area The method for repairing a PC structure according to claim 1 or 2, wherein a reinforcing member is erected. In the installation step, using the PC structure having a protrusion provided in advance in the material axis orthogonal direction, the protrusion provided across the area to be repaired on the surface where the protrusion is provided. The fixing member for attaching the said reinforcement member is attached to the other side of, and the said reinforcement member is bridged between the said projection part and the said fixing member. The PC structure of Claim 1 or 2 characterized by the above-mentioned. Repair method. The PC structure is a box girder in which a space is formed,
The method for repairing a PC structure according to any one of claims 1 to 5, wherein in the installation step, the reinforcing member is arranged in a space inside the PC structure. The installation process is characterized in that the reinforcing member is installed opposite to the surface on which the portion to be repaired is formed and the back surface of the surface on which the portion to be repaired is formed. The repair method of the PC structure of any one statement. The PC structure according to any one of claims 1 to 7, wherein in the installation step, the reinforcing member is installed in a state in which a pressing force is applied toward the outside in the longitudinal direction of the reinforcing member. How to repair things.

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