JP2009280980A - Bridge repairing method and axial force application device for repairing bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly perform positioning and load adjustment when a bridge is repaired. <P>SOLUTION: As shown in Fig.2(A) and (B) when a diagonal member 13 of the bridge is broken due to corrosion, a corroded portion 13a is cut off; ends of a remaining portion serve as first and second mounting portions 13x and 13y, respectively; and portions isolated from each other across the first and second mounting portion 13x and 13y serve as first and second anchoring portions 13m and 13n, respectively. Next, as shown in Fig.2(C), the first and second mounting portions 13x and 13y are brought close to each other by lifting the bridge. Subsequently, as shown in Fig.2(D), an axial force application device 20 is installed in such a manner as to be laid between the first and second anchoring portions 13m and 13n. After that, as shown in Fig.2(E), the first and second anchoring portions 13m and 13n are drawn to each other under an axial force applied state by the axial force application device 20. Thereafter, as shown in Fig.2(F), both ends of a repairing material 51 are fixed to the first and second mounting portions 13x and 13y by abutting on them under the axial force applied state; and then, the axial force application device 20 is removed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bridge repair method and an axial force applying device used for the bridge repair.

  In recent years, corrosion (deterioration) of aging bridges has become a problem, and repairs have attracted attention. In the past, the Kisogawa Ohashi Bridge, which is a steel warren truss bridge of the lower road type, has fractured due to corrosion in the part that penetrates the floor slab in the diagonal (component).

Repair of the bridge was performed as follows with reference to Non-Patent Document 1. First, the corroded portion of the diagonal material is cut away, leaving the upper and lower portions of the diagonal material. A lower end portion of the upper portion is provided as a first attachment portion described later, and an upper end portion of the lower portion is provided as a second attachment portion.
Next, the lower chord material in the vicinity of the broken diagonal member is lifted by the jack means on the temporary receiving vent, and the upper portion of the diagonal member is pulled by the chain block and adjusted coaxially with the lower portion of the diagonal member.
Next, both ends of the repair material are applied to the first and second mounting portions of the diagonal material and fixed with high-strength bolts, whereby the repair material is passed over the first and second mounting portions.
Steel bridge repair / reinforcement case collections, pages 47-48: October 2002, issued by Japan Bridge Construction Association

  In the above repair method, when the repair material is fixed to the fractured diagonal member of the bridge while the lower chord material is lifted, when the lifting by the jack means is released, a tensile load is applied to the repaired diagonal material for the first time. . Therefore, it is difficult to adjust the grade of the repaired diagonal material and other diagonal materials to an appropriate height, and it is also difficult to adjust the tensile load applied to each diagonal material to an appropriate load. .

  The present invention was made to solve the above problems, and in a method of repairing by attaching a repair material to a bridge, in the bridge, parts separated from each other across an attachment region where the repair material is to be attached, As the first and second fixing units, an axial force applying device is installed between the first and second fixing units, and the axial force applying device causes the first fixing unit and the second fixing unit to Axial force in the direction of pulling each other is applied, and the repair material is fixed to the bridge mounting area in this axial force application state, and after fixing the repair material, the axial force application device is removed from the bridge. And

  According to the above method, since the repair material is fixed in a state where the axial force is applied by the axial force applying device, the tensile load applied to the repair material after the axial force applying device is removed after fixing the repair material is borne by the axial force applying device. Is almost equal to the tensile load applied. As a result, the position and load of the bridge components after repair can be predicted, so that each can be easily optimized or allowed.

Preferably, the attachment region is a part of a structural member of the bridge, and the first and second fixing portions are set in the structural material.
According to this, it is possible to repair without replacing the components.

In one aspect, the component material is broken due to deterioration, and the repair material is used to replace a portion including the deteriorated portion of the component material, and prior to the installation step of the axial force applying device, the deteriorated portion is removed. The opposite end portions of the constituent members left after the excision are provided as first and second attachment portions serving as the attachment regions, and are positioned outside the first and second attachment portions. The repair is performed by fixing both ends of the repair material to the first and second mounting portions in a state where the axial force is applied to the first and second fixing portions by applying the axial force. The material is spanned between the first and second mounting portions.
According to this, the fracture | ruptured structural material can be repaired favorably.

Preferably, in the above aspect, the structural member is arranged vertically or inclined with respect to a vertical line, and prior to the installation of the axial force applying device, the bridge is lifted in the vicinity of the broken structural member by jack means, and the axial force is increased. After installing the applying device and applying the axial force, lifting by the jack means is released, and then the repair material is fixed.
According to this, the burden of an axial force provision apparatus can be reduced.

In another aspect, the component material has deteriorated but has not yet broken, and the repair material is used to replace the part including the deteriorated portion of the component material. A pair of parts sandwiched are defined as first and second mounting parts that serve as the mounting area, and a pair of parts positioned outside the first and second mounting parts are defined as the first and second fixing parts. In the state where the axial force is applied to the first and second fixing portions and the axial force is applied, the deteriorated portion is excised, and then the repair material is applied to the first and second mounting portions. By fixing both ends, the repair material is spanned between the first and second mounting portions.
According to this, it is possible to satisfactorily repair the constituent material that has not been broken due to deterioration, with the excision of the deteriorated portion. In addition, since the repair is performed in a state where the axial force is previously applied by the axial force applying device, there is no fear of breaking during the repair.

In still another aspect, the component material has deteriorated but has not yet broken, and the attachment region of the component material includes the deteriorated portion, and the axial force applying device is provided in the first and second fixing portions. The repair material is fixed to the attachment region in a state where the axial force is applied.
According to this, it is possible to satisfactorily repair the constituent material that has not been broken due to deterioration without being accompanied by excision of the deteriorated portion.

Preferably, the axial force applying device includes first and second fixing members, and attraction means spanned between the first and second fixing members, and the first and second fixing members are provided. The axial force is applied by fixing the first and second fixing units to the first and second fixing units in a detachable manner, and bringing the first and second fixing members closer to each other by the attraction means.
According to this, axial force can be stably provided.

  Preferably, the attraction means includes an axial force detection means, and the axial force is adjusted so that the axial force detected by the axial force detection means becomes a set value.

Preferably, the attraction means includes a steel rod spanned over the first and second fixing members and a jack, and one end of the steel rod is attached to one of the first and second fixing members. Connected, the other end penetrates the other fixing member and is connected to the jack, the jack is installed on the other fixing member on the opposite side of the one fixing member, and by pulling the steel rod, The axial force is applied.
According to this, since the steel rod is only disposed at the repair site, the repair work can be performed smoothly.

Preferably, the jack is installed on the other fixing member via a hollow ram chair, and a nut is screwed into the steel rod in the ram chair, and the steel rod is pulled by the jack, An adjustment shim is inserted between the nut and the other fixing member, and the repair material is fixed while maintaining an axial force corresponding to the thickness of the adjustment shim.
According to this, a predetermined axial force can be reliably maintained by the adjustment shim.

  Further, when the repair material is attached to the bridge, the present invention is spanned between the first and second fixing portions sandwiching the attachment region where the repair material is attached to the bridge. An axial force applying device that applies an axial force in a direction to draw each other, a first fixing member that is detachably fixed to the first fixing unit, and a second fixing member that is detachably fixed to the second fixing unit. The image forming apparatus includes a fixing member and an attracting unit that is stretched between the first and second fixing members.

  Preferably, the attraction means has a steel rod spanned between the first and second fixing members and a jack, and one end of the steel rod is attached to one of the first and second fixing members. Connected, the other end penetrates the other fixing member and is connected to the jack, the jack is installed on the other fixing member on the opposite side of the one fixing member, and by pulling the steel rod, The axial force is applied.

  Preferably, the attraction means further includes a hollow ram chair, an adjustment shim, and a nut, the jack is installed on the other fixing member via the ram chair, and the nut is attached to the steel rod in the ram chair. The adjusting shim is inserted between the nut and the other fixing member in a state where the steel bar is pulled by the jack.

Preferably, one end of the steel rod is connected to the one fixing member via a universal joint.
According to this, it is possible to suppress or avoid applying a bending load to the steel rod.

  According to the present invention, the position and the load of the structural member of the bridge after repair can be easily set to the optimum or allowable range.

  Hereinafter, an embodiment of a bridge repair method of the present invention will be described with reference to the drawings. FIG. 1 shows a downhill steel warren truss bridge (truss bridge). This bridge is configured by spanning a bridge 10 between the abutment 1 and the pier 2 or between adjacent piers 2.

  The bridge 10 is arranged at a position slightly higher than the lower chord material 4, the lower chord material 11, the upper chord material 12, a large number of diagonal materials 13 (abdomen and constituent materials) connecting the lower chord material 11 and the upper chord material 12. The floor slab 14 is provided. A connecting portion (score) between the diagonal member 13 and the lower chord member 11 is indicated by reference numeral 15. In the present embodiment, the diagonal member 13 is made of H-section steel.

  The diagonal member 13 passes through the floor slab 14. Although not shown, in the floor slab 14, a portion sandwiched between the left and right diagonal members 13 is a road for vehicle traffic, and a portion on the outer side in the width direction from the diagonal members 13 is a sidewalk. In the diagonal member 13, the portion that intersects the upper surface of the floor slab 14 is most easily corroded.

  A repair method in the case where the diagonal member 13 indicated by the arrow A in FIG. In FIG. 2, the upper part of the broken diagonal member 13 is indicated by reference numeral 13U, and the lower part is indicated by reference numeral 13L.

In the first step, the corroded portion 13a (deteriorated portion) of the diagonal material 13 is excised as shown by the oblique lines in FIG. The corroded portion 13a may include a portion that is not actually corroded.
As a result, as shown by hatching in FIG. 2B, the lower end portion of the remaining upper portion 13U becomes the first attachment portion 13x (attachment region), and the upper end portion of the lower portion 13L (the lower side in this embodiment) The portion 13L occupies most of the portion 13L but is referred to as an end portion) is the second attachment portion 13y (attachment region). These mounting portions 13x, 13y have an H-shaped cross section that is not corroded and are separated from each other.

A pair of portions located outside the mounting portions 13x and 13y are provided as first and second fixing portions 13m and 13n described later. In the present embodiment, the first fixing portion 13m is adjacent to the upper side of the first attachment portion 13x in the upper portion 13U. Similarly, the second fixing portion 13n is adjacent to the lower side of the second attachment portion 13y in the lower portion 13L.
In the next second step, the surface of the attachment portions 13x and 13y is removed to make it smooth (adjustment of the bonding surface).

When the diagonal member 13 breaks, the lower chord member 11 bends downward, and the position of the lower rating point 15 of the broken diagonal member 13 is also displaced downward.
Therefore, in the third step, as shown by the phantom line in FIG. 1, the lower chord material 11 near the fractured portion is lifted by the jack means 5 on the temporary receiving vent, and as shown by the arrow in FIG. Then, the lower rating point 15 of the broken diagonal member 13 and the second attachment portion 13y of the diagonal member 13 are displaced upward. The height of the rating point 15 is preferably adjusted to be lower than the optimum height.

  Further, when the diagonal member 13 breaks in the vicinity of the floor slab 14, the upper portion 13U of the diagonal member 13 has a long length, and therefore hangs down from its original position due to its own weight. Therefore, in the third step, the main body of the chain block is attached to a constituent member of the bridge 10 other than the broken diagonal member (for example, the upper chord member 12 or other diagonal member 13), and the hook at the chain end is attached to the first attachment member. By hooking on the portion 13x or the vicinity thereof and drawing it as indicated by an arrow in FIG. 2C, the axes of the upper portion 13U and the lower portion L are roughly matched.

  In the next fourth step, as shown in FIGS. 2D and 4, two sets of the axial force applying device 20 are spanned between the fixing portions 13 m and 13 n of the diagonal member 13 (the axial force applying device 20 Installation).

  Each axial force applying device 20 includes a first fixing member 21 that is detachably fixed to the first fixing unit 13m, a second fixing member 22 that is detachably fixed to the second fixing unit 13, and the fixing members 21. , 22 as two main components.

  Each attraction means 30 includes a PC steel bar 31 in which a screw is formed over a necessary portion or the entire length, a jack 34, and a hollow ram chair 35.

  One end portion of the steel rod 31 penetrates the second fixing member 22 with a play in the radial direction, and a nut 32 screwed to the one end portion is engaged with the lower surface of the second fixing member 22. By doing so, the steel rod 31 is connected to the second fixing member 22.

The other end of the steel bar 31 passes through the first fixing member 21 with a play in the radial direction, and the other end is connected to the jack 34.
The jack 34 of this embodiment is a hydraulically driven center hole jack, and is installed on the upper surface of the first fixing member 21 via the ram chair 35.
A nut 33 is screwed into the other end of the steel bar 31 in the ram chair 35. As shown in FIG. 4, a washer 33 a is interposed between the nut 33 and the first fixing member 21.

As shown in FIG. 4, the jack 34 is configured to displace the piston 36 in the axial direction by hydraulic pressure. A tension bar 37 passes through the piston 36.
One end portion of the tension bar 37 is connected to the upper end portion of the steel bar 31 in the ram chair 35 so as to be screwed, and the other end portion projects upward from the piston 36.
A nut 38 is screwed to the other end of the tension bar 37, and a washer 38a and a load cell 39 (axial force detecting means) are interposed between the nut 38 and the piston 36.

  Returning to FIG. 2D, the installation process of the axial force applying device 20 as the fourth process will be described. As shown in FIG. 3, the two sets of axial force applying devices 20 are disposed along a pair of flanges 13 f of the diagonal member 13 made of H-section steel.

  As shown in FIGS. 2D and 3, the first fixing member 21 and the flange are fixed to the flange 13 f of the first fixing portion 13 m in the upper portion 13 U of the diagonal member 13. Both are connected by a bolt 41 and a nut 42 penetrating 13f.

  Similarly, in a state where the second fixing member 22 is in contact with the flange 13f of the second fixing portion 13n in the lower portion 13L of the diagonal member 13, a bolt 41 and a nut 42 that pass through the second fixing portion 22 and the flange 13f. To connect them together.

  As described above, the fixing members 21 and 22 extend in a direction orthogonal to the axial direction of the diagonal member 13, and are fixed in a state where both end portions protrude from the diagonal member 13. Prior to fixing the fixing members 21 and 22, a bolt hole 13h ′ (shown only in FIG. 2F) for allowing the bolt 41 to pass through is formed in the flange 13f of the fixing portions 13m and 13n. deep.

After fixing the fixing members 21 and 22 to the fixing portions 13m and 13n, the steel rod 31, the jack 34, the ram chair 35 and the like are assembled to the fixing members 21 and 22.
After the axial force imparting device 20 is installed as described above, in the next fifth step, as shown in FIG. 4B, the jack 34 is driven and the piston 36 is moved upward. As a result, the piston 36 lifts the nut 38 via the load cell 39, and the tension bar 37 pulls the steel bar 31 upward along with this.

As a result, as shown in FIG. 2 (E), the first attachment portion 13x of the upper portion 13U of the diagonal member 13 and the second attachment portion 13y of the lower portion 13L are attracted to each other. In other words, the rating point 15 of the broken diagonal member 13 is raised.
As shown in FIG. 4B, the nut 33 is displaced upward from the position where it is seated on the upper surface of the first fixing member 21 together with the washer 33a.

  When the detected axial force of the load cell 39 reaches a set value, the adjustment shim 45 is inserted between the washer 33a and the upper surface of the first fixing member 21, as shown in FIGS. 2 (E) and 4 (C). . The adjustment shim 45 has a C shape and can be inserted into the steel rod 31 by being inserted through the opening 35 a of the ram chair 35.

  After the adjustment shim 45 is inserted, the drive of the jack 34 is stopped. When the drive of the jack 34 is stopped, a load of the nut 35 is applied to the adjustment shim 45. In other words, the adjustment shim 45 is responsible for the tensile load of the steel bar 31.

The thickness of the adjustment shim 45 is such that a large number of rating points 15 of the bridge 10 are at the optimum height (or an allowable height), and the tensile load on the large number of diagonal members 13 including the diagonal member 13 to be repaired. Is determined in advance so as to be an optimum value (or an allowable range).
The thickness of the adjustment shim 45 is calculated by frame analysis based on the influence value when the tensile load on the diagonal member 13 to be repaired increases by a unit amount.

In the present embodiment, the set value of the axial force before the adjustment shim 45 is inserted is a value slightly larger than the axial force that the calculated thickness adjustment shim 45 takes on.
Before and after the fifth step, bolt holes 13h are formed in the pair of flanges 13f and webs 13w of the attachment portions 13x and 13y.

In the next sixth step, the lifted state of the lower chord member 11 by the jack means 5 of FIG. 1 is released, and the chain block is removed from the upper portion 13U.
In the next seventh step, as shown in FIGS. 2 (F) and 5, the first mounting portion of the upper portion 13 </ b> L is obtained using three types of plate-shaped repair materials 51, 52, 53 having a predetermined length L. 13x and the second attachment portion 13y of the lower portion 13U are connected.

  More specifically, two first repair materials 51 are prepared, and both end portions thereof are brought into contact with the outer surfaces of the flanges 13f of the attachment portions 13x and 13y. Four second repair materials 52 are prepared and applied to the inner surfaces of the flanges 13f of the attachment portions 13x and 13y. Then, the ends of the repair materials 51 and 52 are friction-joined (fixed) to the flanges 13f of the attachment portions 13x and 13y by the high-strength bolts 55 penetrating the repair materials 51 and 52 and the flange 13f and the nut 56.

  Two pieces of the third repair material 53 are prepared, and both end portions thereof are applied to both surfaces of the webs 13w of the mounting portions 13x and 13y. Then, the end portions of the repair material 53 are frictionally joined (fixed) to the webs 13w of the attachment portions 13x and 13y by the high strength bolts 55 penetrating the two repair materials 53 and the web 13w and the nut 56.

  Prior to the connection by the repair materials 51 to 53, a steel material 59 for filling is inserted between the attachment portions 13x and 13y. The steel material 59 for filling has an H-shaped cross-sectional shape equal to that of the diagonal member 13, and the length thereof is equal to the interval between the connecting end portions 13x and 13y. At the time of the above connection, the flange of the steel material 59 for filling is fixed to the intermediate portion of the repair materials 41 and 42 by bolts 55 and nuts 56, similarly to the attachment portions 13x and 13y, and the web is attached to the attachment portions 13x and 13y. Similarly, it is fixed to an intermediate portion between the two repair materials 53 by bolts 55 and nuts 56.

In the next eighth step, the axial force applying device 20 is removed from the repaired diagonal member 13 as shown in FIG.
When the axial force applying device 20 is removed, a tensile load is applied to the repair materials 51 to 53, and this tensile load is equal to the tensile load borne by the axial force applying device 20 in the inserted state of the adjustment shim 45. , The optimum load (or an acceptable weight). Further, the height of the lower grade 15 of the repair diagonal 13 maintained with the adjustment shim 45 inserted is not changed, and the height of the other grades 15 is not changed. (Or acceptable height).

  In the first embodiment, the second fixing member 22 and the steel rod 31 may be connected using a universal joint 60 as shown in FIG. The universal joint 60 includes an intermediate element 61, two end elements 62 and 63, and connecting elements 64 and 65 that rotatably connect the intermediate element 61 to the end elements 62 and 63. The rotation axes of the connecting elements 64 and 65 are orthogonal to each other. One end element 62 is screwed with one end of a screw rod 66 penetrating the second fixing member 22, and the other end element 63 is screwed with an end of the steel rod 31. A nut 32 is screwed onto the screw rod 66 and is locked to the lower surface of the second fixing member 22.

If the universal joint 60 is used, the axial force imparting device 20 can be reliably passed even if the axes of the upper portion 13U and the lower portion 13L of the diagonal member 13 are shifted.
The universal joint 60 may also be interposed between the jack 34 installed on the first fixing member 21 and the steel bar 31. In this case, a screw rod is used instead of the steel rod penetrating the first fixing member 21 in FIG. 4, and the tension bar 37 is coupled to the screw rod and the nut 33 is screwed. Then, the screw rod and the steel rod 31 are connected via the universal joint 60.

  In the first embodiment, the axial force applying device 20 is installed on the fractured diagonal member 13 with the lower chord member 12 jacked up. However, when the deformation amount of the bridge 10 due to the breakage is small, the lower chord member 12 is jacked up. May be omitted.

  Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment relates to a repair method in the case where the diagonal member 13 (abdomen, component) of the bridge is corroded but the degree of corrosion is slight and not broken.

  In the first step, as shown in FIG. 7 (A), a first fixing unit 13m and a second fixing unit 13n sandwiching the corroded portion 13a ′ (deteriorated portion) are defined, and the fixing units 13m and 13n are provided. The axial force applying device 20 is installed by fixing the fixing members 21 and 22 of the axial force applying device 20 having the same configuration as that of the first embodiment.

  Next, the jack 34 of the axial force applying device 20 is driven to generate an axial force that attracts the fixing portions 13m and 13n to each other. A tensile load is applied to the diagonal member 13, but the tensile load acting on the diagonal member 13 decreases due to the generation of the axial force by the axial force applying device 20, eventually becomes zero, and when the axial force is further increased, the compressive load is increased. Changes to.

  Next, an adjustment shim 45 having a thickness calculated in advance with the axial force applied by the jack 34 is interposed between the nut 33 and the first fixing member 21. In the present embodiment, since the relative displacement amount between the fixing portions 13m and 13n of the diagonal member 11 is expected to be small, the adjustment shim 45 is thinner than the first embodiment.

  After the adjustment shim 45 is inserted, the drive of the jack 34 is stopped. As a result, the axial force of the axial force applying device 20 is maintained by the adjustment shim 45.

  In the state where the axial force is maintained by the adjustment shim 45, as shown in FIG. 7B, the surface of the region 13z (attachment region) including the corroded portion 13a is removed and smoothed (base adjustment of the joint surface). . The attachment region 13z includes portions that are not corroded on both sides in the axial direction of the corroded portion 13a.

  Next, with the axial force maintained by the adjustment shim 45, a bolt hole 13h is formed in the mounting region 13z as shown in FIG. 7C, and then, as shown in FIG. A repair material 51 ′ having a length corresponding to the region 13z is applied to the attachment region 13z and fixed with a high-strength bolt 55 and a nut. When the diagonal member 13 is H-shaped steel, three types of repair materials are fixed in the same manner as in the first embodiment.

After the fixing of the repair material 51 ′ is completed, the axial force applying device 20 is removed as shown in FIG.
The base adjustment of the mounting region 13z and the formation of the bolt hole 13h may be performed before generating and maintaining the axial force.

Next, a third embodiment of the present invention will be described. Similar to the second embodiment, the present embodiment also relates to a repair method when the diagonal member 13 (abdomen, component) of the bridge is corroded but not broken. The degree of corrosion is more advanced than in the second embodiment.
In the first step, as shown in FIG. 7A, the axial force applying device 20 is installed on the diagonal member 13 to apply the axial force, as in the second embodiment.

In the next step, the corroded portion 13a ′ is excised. After excision, the base material of the mounting portion divided into two parts is adjusted and the bolt holes are formed, and the repair material is fixed and the axial force applying device 20 is removed as in the first embodiment. See FIGS. 2E and 2F.
In the third embodiment, after excision of the corroded portion 13a ′, the axial force is readjusted by the jack 34 and the adjustment shim 35 of the axial force applying device 20, and then the repair material is fixed and the axial force applying device 20 is removed. May be performed.

The present invention is not limited to the above embodiment and can be adopted in various forms. For example, the component to be repaired may have a rectangular cross section. In this case, using one-side bolts, a total of four repair materials are applied and fixed to the four outer surfaces of the constituent material.
Instead of inserting the adjustment shim 45 between the nut 33 and the first fixing member, the nut 33 may be rotated and moved downward to be fastened to the first fixing member 21 via the washer 33a.

When applying the axial force, not only the detection information of the load cell but also the detection information of the strain gauge provided in the adjacent diagonal material may be monitored.
The present invention can also be applied to repair of vertical members for truss bridges, vertical members for arch bridges, suspension members, and the like.
The repair method of the present invention can be applied to a case where one constituent material is replaced with a repair material instead of a part of a constituent material such as a diagonal member.

It is a side view which shows the bridge to which 1st Embodiment of the repair method of this invention is applied. (A)-(F) are the schematic side views explaining the repair method in order of a process. It is a top view of the axial force provision apparatus used with the repair method. (A)-(C) are sectional drawings which show the principal part of the attraction | suction means of a coaxial force provision apparatus in order of a process. It is a cross-sectional view which follows the VV line in FIG. It is a schematic side view which shows the modification of the connection structure of a fixing member and a steel bar. (A)-(D) are schematic side views explaining 2nd Embodiment of the repair method of this invention to process order.

Explanation of symbols

5 Jack means 10 Bridge 12 Lower chord material 13 Diagonal material (abdomen, component)
13a, 13a 'Corroded part (deteriorated part)
13x, 13y 1st, 2nd attachment part (attachment area)
13z Mounting regions 13m, 13n First and second fixing portions 15 Rating point 20 Axial force adjusting devices 21, 22 First and second fixing members 30 Attracting means 31 Steel bar 33 Nut 34 Jack 35 Ram chair 39 Load cell (Axial force Detection means)
45 Adjustment shims 51 to 53, 51 'Repair material 55 Bolt 56 Nut 60 Universal joint

Claims (14)

In the method of repairing by attaching repair materials to the bridge,
In the bridge, the parts that are separated from each other across the attachment region where the repair material is to be attached are defined as first and second fixing parts,
Install the axial force applying device between the first and second fixing parts,
Applying an axial force in a direction to draw the first fixing unit and the second fixing unit toward each other by the axial force applying device,
In this axial force application state, fix the repair material against the bridge mounting area,
A bridge repairing method comprising removing the axial force applying device from the bridge after fixing the repair material.   The bridge repair method according to claim 1, wherein the attachment region is a part of a structural member of the bridge, and the first and second fixing portions are set in the structural material. The component material is broken due to deterioration, and the repair material is used to replace the part containing the deteriorated portion of the component material,
Prior to the installation step of the axial force imparting device, the deteriorated portion is excised, and the opposite ends of the constituent members left by the excision are provided as the first and second attachment portions serving as the attachment regions,
In the state where the axial force is applied to the first and second fixing portions located outside the first and second attachment portions with the axial force applied, the both ends of the repair material are The bridge repair method according to claim 2, wherein the repair material is stretched between the first and second mounting portions by being fixed to the first and second mounting portions. The components are arranged vertically or tilted with respect to the vertical line;
Prior to installation of the axial force applying device, the bridge is lifted by the jack means in the vicinity of the fractured component,
The bridge repair method according to claim 3, wherein after the axial force applying device is installed and the axial force is applied, lifting by the jack means is released, and then the repair material is fixed. Although the component material has deteriorated, it has not yet broken, and the repair material is used to replace the part including the deteriorated portion of the component material,
In the component, the pair of parts sandwiching the deteriorated part is defined as the first and second attachment parts to be the attachment region, and the pair of parts located outside the first and second attachment parts are arranged as described above. Set as first and second fixing parts,
In the state where the axial force is applied to the first and second fixing portions by applying the axial force applying device, the deteriorated portion is excised,
The repair material is then spanned between the first and second mounting portions by fixing both ends of the repair material to the first and second mounting portions. Bridge repair method. Although the component material has deteriorated, it has not yet broken, and the attachment region of the component material includes the deteriorated portion,
The bridge repair according to claim 2, wherein the repair material is fixed to the attachment region in a state where the axial force is applied to the first and second fixing portions. Method. The axial force applying device includes first and second fixing members, and an attracting unit that is stretched between the first and second fixing members.
The first and second fixing members are detachably fixed to the first and second fixing portions, respectively, and the first and second fixing members are brought close to each other by the attraction means, thereby applying the axial force. The bridge repair method according to any one of claims 1 to 6.   The bridge repair method according to claim 7, wherein the attraction means includes an axial force detection means, and the axial force is adjusted so that the axial force detected by the axial force detection means becomes a set value.   The attraction means has a steel rod spanned over the first and second fixing members and a jack, and one end of the steel rod is connected to one of the first and second fixing members, The other end penetrates the other fixing member and is connected to the jack. The jack is installed on the other fixing member on the opposite side of the one fixing member, and the axial force is increased by pulling the steel rod. The bridge repairing method according to claim 7 or 8, wherein: The jack is installed on the other fixing member via a hollow ram chair, and a nut is screwed into the steel rod in the ram chair.
With the steel rod pulled by the jack, an adjustment shim is inserted between the nut and the other fixing member, and the axial force corresponding to the thickness of the adjustment shim is maintained, and the repair material The bridge repair method according to claim 9, wherein fixing is performed. When the repair material is attached to the bridge, the bridge is bridged between the first and second fixing portions sandwiching the attachment region where the repair material is attached to the bridge, and the first and second fixing portions are pulled in a direction to draw each other. An axial force applying device for applying an axial force,
It is spanned between a first fixing member that is detachably fixed to the first fixing unit, a second fixing member that is detachably fixed to the second fixing unit, and the first and second fixing members. An axial force imparting device for repairing a bridge, comprising:   The attraction means has a steel bar and a jack that are spanned between the first and second fixing members, and one end of the steel bar is connected to one of the first and second fixing members, The other end penetrates the other fixing member and is connected to the jack. The jack is installed on the other fixing member on the opposite side of the one fixing member, and the axial force is increased by pulling the steel rod. The axial force imparting device for bridge repair according to claim 11, wherein: The attraction means further includes a hollow ram chair, an adjustment shim, and a nut. The jack is installed on the other fixing member via the ram chair, and the nut is screwed into the steel rod in the ram chair. And
13. The bridge repairing axial force applying device according to claim 12, wherein the adjustment shim is inserted between the nut and the other fixing member in a state where the steel bar is pulled by the jack.   The axial force applying device for bridge repair according to claim 12 or 13, wherein one end of the steel bar is connected to the one fixing member via a universal joint.

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