JP2010144453A - Method for replacing bearing apparatus, and bearing apparatus for replacement used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with main girder jacking-up operation. <P>SOLUTION: A sole plate 23 is mounted to the lower face of a required part of a full web part of main girders 4, 5, 6. A bearing body 22 is provided on an extended cross beam 14 below the sole plate 23 through a pedestal 11, and a filling material filling space part 24 is formed between the upper face of an upper shoe 22a of the bearing body 22 and the lower face of the sole plate 23. Nonshrinkage mortar 25 is filled in the filling material filling space part 24 and hardened. A bearing apparatus 21 for replacement having a vertical dimension coinciding with a space between the extended cross beam 14 and the main girders 4, 5, 6 is thereby formed between the extension cross beam 14 and the main girders 4, 5, 6. The existing bearing apparatus 10 is then cut gradually to replace the load of the main girders 4, 5, 6 from the existing bearing apparatus 10 to the new bearing apparatus 21 for replacement. The existing bearing apparatus 10 is then removed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides a required support structure such as a support device provided between a bridge pier of a girder bridge and each main girder so as to transmit and support the load of each main girder to the pier. An existing support device that is provided so as to be interposed between a supported structure placed above the support structure and transmits the load of the supported structure to the support structure is supported by a new support. The present invention relates to a replacement method for a support device used for replacing the device, and a replacement support device used for the method.

  One type of steel bridge is a multi-main I-girder bridge. As an example of this type of multi-main I-girder bridge, for example, FIG. There are three main I girder bridges as shown in FIG.

  This is made of a gate-shaped steel made up of a pair of pedestals 2 standing on both sides in the bridge width direction, and cross beams 3 extending in the bridge width direction and integrally attached to the respective pedestals 2 at both ends thereof. A pier 1 is provided.

  Further, three main girders 4, 5 and 6 consisting of I-digits are arranged at a required interval in the bridge width direction, and among the main girders 4, 5 and 6, each main girder at both ends in the bridge width direction. (Below, referred to as the outer main girder) 4 and 6 girder ends are full webs, and the main girder (hereinafter referred to as the middle main girder) 5 in the center of the bridge width direction is notched to the lower side. Part 7 is provided. In the middle main girder 5, both side surfaces of a required part of the girder edge that is away from the upper girder end of the notch 7 and girder ends of the outer main girder 4 and 6 located on both sides thereof As a configuration in which the upper inner surface of the required portion of the end of the girder which is separated from the required dimension is integrally connected via a cross beam (hereinafter referred to as an end cross beam) 8 extending in the bridge width direction, A beam end provided with a notch 7 and a position closer to the outer end of each end cross beam 8 in the bridge width direction project below the bridge axial direction surface of the cross beam 3 of the steel pier 1. The support brackets 10a, 9b, 9c are supported above the support brackets 10a, 9b, 9c.

  As shown in FIG. 9, each of the support devices 10 usually includes a base 11 installed on each girder bracket 9a, 9b, 9c, a support body (shoe) 12 attached on each base 11, and the above A sole plate 13 attached to the lower surface of the end of the spar provided with the notch portion 7 of the middle main spar 5 and the required position directly above the support body 12 on the lower surface of each end lateral girder 8; The sole plate 13 is connected to the upper collar 12a of each support body 12 via a set bolt (not shown).

According to the I girder bridge having such a configuration, the main beam 4, 5, 6 can be received within the vertical dimension of the horizontal beam 3 by the horizontal beam 3 of the steel pier 1 so that the horizontal beam 3 The height positions of the upper and lower ends of the main girder can be aligned with the height positions of the upper and lower ends of each of the main girders 4, 5 and 6, and this is an advantageous configuration in the case where the girder is restricted due to construction limits or the like. I can do it. In FIGS. 8A, 8B, and 8C, illustration of floor slabs provided on the upper side of the cross beam 3 and the main girders 4, 5, 6 of the steel pier 1 is omitted for convenience of illustration. (The same applies to the following figures.)
By the way, in recent years, in the I girder bridge having the structure as shown in FIGS. 8 (A), (B) and (C) and FIG. 9, the function of the support body 12 of each support device 10 due to aging, The surrounding damage has been pointed out.

  For this purpose, a so-called main girder full web construction work has been conventionally carried out as a repair method for reinforce the surroundings of the bearings while restoring functions by replacing each existing bearing device 10 (see, for example, Non-Patent Document 1). .

  The main girder full web construction is performed, for example, according to the procedures shown in FIGS. 10 (a) (b) to 12 (a) (b) (c). That is, first, as shown in FIGS. 10 (a) and 10 (b), the cross beam 3 of the steel pier 1 in the I girder bridge having the same configuration as that shown in FIGS. 8 (a), (b) and (c) and FIG. On the lower side, a wide additional horizontal beam 14 extending to the lower position of the edge of each girder 4, 5, 6 in the direction of the bridge axis is arranged, and its upper end is integrally attached to the lower end of the horizontal beam 3. At the same time, both ends of the additional horizontal beam 14 in the bridge width direction are fixed integrally to the two pillars 2 respectively. Further, at the positions directly below the main girders 4, 5 and 6 on each bridge axial direction surface of the additional horizontal beam 14, individual jack-up cradles 15a, 15b, and 15c are connected to the middle main girder 5, respectively. Each web is temporarily installed so as to project along the bridge axis direction to the center side position of the span corresponding to the full web portion.

  Next, as shown in FIGS. 11 (a), (b), and (c), the jacks 16 installed on the jack-up cradles 15a, 15b, and 15c of the additional lateral beam 14 are respectively jacked up, By receiving the lower flanges of the main girders 4, 5 and 6 on the upper side of the jack 16, the load acting on the main girders 4, 5, and 6 can be applied to the jacks 16 and the jack up receptacles. It is transmitted to and supported by the additional lateral beam 14 via the bases 15a, 15b and 15c.

  Next, as described above, when the load acting on the main girders 4, 5 and 6 is received by the additional lateral beams 14 via the jacks 16 and the jack-up cradles 15a, 15b and 15c, The girder brackets 9a, 9b, and 9c provided on the bridge axial direction surfaces of the cross beam 3 of the steel pier 1 and the support devices 10 above the girder brackets 9a, 9b, and 9c have loads from the main girders 4, 5, and 6, respectively. In this state, the existing girder brackets 9a, 9b, 9c and the existing support devices 10 are removed from the cross beam 3 in this state.

  Thereafter, the lower flange provided around the notch 7 of the middle main girder 5 is cut out, and then the girder receiving the end of the middle main girder 5 as shown in FIG. In the space where the receiving bracket 9b and the support device 10 are removed, the full web forming reinforcing member 17 of the required shape that can be fitted into the notched portion of the web is joined to the remaining web of the middle main beam 5. Then, the digit end of the middle main beam 5 is made into a full web. Further, at the position arranged above the additional lateral beam 14 and above the new support device 19 to be described later at the end of the full web-shaped middle main beam 5, the vertical direction from the lower end of the web to the vicinity of the upper end is provided. The reinforcing material 18 on the fulcrum extending to the side of the web is reinforced with ribs attached to both sides and the lower flange of the web, and both sides of the web and the lower flange in the vicinity of both sides in the bridge axis direction of the reinforcing material 18 on the fulcrum. Further, reinforcing ribs 20 are respectively attached. Similarly, as shown in FIG. 12 (c), at the positions of the outer main girders 4 and 6 above the additional lateral beam 14 at the end of the outer main girder 4 and 6 and above the new bearing device 19 described later, Reinforcing material 18 on the fulcrum is attached to both sides of the web and the upper and lower flanges in a rib shape and reinforced, and reinforcing ribs 20 are further attached to the sides and lower flanges of the web in the vicinity of both sides in the bridge axis direction.

  After the full web at the end of the middle main beam 5 is completed as described above, as shown in FIGS. 12 (a), (b), and (c), the main beams 4, 5, After a new bearing device 19 composed of a pedestal, a bearing body, and a sole plate (not shown) similar to the existing bearing device 10 shown in FIG. 9 is provided at a predetermined position just below the final bearing position at the end of the six girders. Then, by jacking down each of the jacks 16, the final support position of the end of each of the main girders 4, 5, 6 is supported by the additional lateral beam 14 via the respective new support devices 19, The replacement of the existing bearing device 10 with the new bearing device 19 and the reinforcement work around the bearing are completed.

  Thereafter, the jack-up cradles 15a, 15b, and 15c temporarily installed on the jacks 16 and the additional lateral beams 14 are removed, respectively, and if necessary, the existing end cross beams 8 can be moved or moved. It is supposed to be replaced.

Tetsuhiro Shimozato, “Operation Rejuvenation of Metropolitan Expressway”, JSSC Journal, Japan Steel Structure Association, October 2003, No. 50, p. 1-10

  However, in the replacement method of the conventional bearing device shown in FIGS. 10 (a) (b) to 12 (b) (b) (c), the girder bracket 9a provided on the cross beam 3 of the steel pier 1 is used. , 9b, 9c, the original vertical positions of the main girders 4, 5 and 6 supported directly or via the end cross beam 8 on the existing support device 10, and the additional horizontal beam to be added to the steel pier 1 14 so that the vertical positions of the main girders 4, 5 and 6 that are respectively supported by the new support devices 19 on the same position are matched with each other. By setting, the vertical position of the main girders 4, 5 and 6 does not change before and after the support device replacement work, but after adding the additional horizontal beam 14 to the steel pier 1, Immediately below the final support position of the end of each main beam 4, 5, 6 on the upper surface of the additional horizontal beam 14 In order to perform the operation of disposing the new bearing devices 19 having the predetermined height at predetermined positions, the end of the main girders 4, 5 and 6 are set to the required dimensions from the initial vertical position. By displacing upward, the distance from the upper surface of the additional horizontal beam 14 to the lower flange lower surface of the final support position of the main girders 4, 5, 6 is made wider than the height of each of the new support devices 19. It is necessary to keep.

  Further, when removing each existing support device 10 that has supported the main girders 4, 5, 6 directly or via the end cross-girder 8, the removal operation is performed on each of the support devices 10. This is performed after the load acting on the girders 4, 5 and 6 is completely removed.

  For this purpose, in the conventional method for replacing the support device, the main girders 4, 5, 6 are replaced with the original support positions of the existing support devices 10 in the longitudinal direction of the main girders 4, 5, 6; In addition, since it is necessary to once jack up at a location different from the final support position by each of the new support devices 19, the main beams 4, 5, 6 are jacked up to the additional lateral beam 14. It is necessary to provide temporary jack-up cradles 15a, 15b, and 15c used exclusively for operation. Therefore, steel materials and manufacturing costs required for manufacturing the jack-up cradles 15a, 15b, and 15c are increased. Actually, it takes time and effort to install and remove the jack-up cradle 15a, 15b, 15c.

  Therefore, the present invention is provided such that it is interposed between the steel pier of the I-girder bridge and each main girder, and the load of each main girder is transmitted to and supported by the pier, An existing support device provided between a required support structure and a supported structure and configured to transmit and support the load of the supported structure to the support structure is provided with the supported structure. It is possible to replace with a new support device without requiring a jack-up operation of an object, and to eliminate the need to provide a jack-up cradle dedicated for jack-up operation of a supported structure. It is an object of the present invention to provide a replacement method for a support device for replacement and a support device for replacement used in the method.

  In order to solve the above-mentioned problems, the present invention, corresponding to claim 1, attaches a sole plate to a required portion of a supported structure supported by an existing support device, and supports the structure below the sole plate. A pedestal is provided on the object, and a support body is attached to the upper side of the pedestal to form a filling material filling space between the upper surface of the upper surface of the support body and the lower surface of the sole plate, The support structure is composed of the pedestal, the support body, the padding material, and the sole plate between the support structure and the supported structure by inserting the padding material into the space for filling the padding material. And a support device for replacement having a vertical dimension corresponding to the interval between the supported structure and a transmission path of a load to the support structure via the existing support device of the supported structure, The above supported structure by gradually breaking The load is gradually replaced from the existing support device to the replacement support device, and the load of the supported structure is transmitted to the support structure via the replacement support device to be supported. The equipment replacement method will be used.

  Further, in the above configuration, a curable fluid is used as a filling material to be inserted into a filling material filling space formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate.

  According to a third aspect of the present invention, there is provided a sole plate attached to a required portion of a supported structure supported by an existing support device, and a pedestal for installation at a position directly below the sole plate on the support structure. And a support body to be mounted on the pedestal, and a filling material for inserting into the filling material filling space formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate. A replacement support device.

  Further, in the configuration of the replacement support device described above, the spacing material to be inserted into the spacing material filling space formed between the upper surface of the upper collar of the bearing body and the lower surface of the sole plate is a curable fluid. And

  Furthermore, in the structure of the replacement support device described above, a space filling space portion formed between the upper surface of the upper collar and the lower surface of the sole plate is formed on the upper surface side of the outer peripheral edge of the upper collar of the support body. It is set as the structure which provided the surrounding weir part.

According to the present invention, the following excellent effects are exhibited.
(1) A sole plate is attached to a required portion of a supported structure supported by an existing support device, a pedestal is provided on the support structure below the sole plate, and a support body is provided above the pedestal. Attaching and forming a filling material filling space between the upper surface of the upper collar of the support body and the lower surface of the sole plate, and then inserting the filling material into the filling material filling space, For replacement, comprising the pedestal, the support body, the padding material, and the sole plate between the support structure and the supported structure and having a vertical dimension corresponding to the distance between the support structure and the supported structure. Forming a support device, and then gradually breaking the load transmission path to the support structure via the existing support device of the supported structure to thereby apply the load of the supported structure to the support structure. From the bearing device to the above replacement bearing device Since there is a replacement method for the support device that changes the load every time and transmits the load of the supported structure to the support structure via the support device for replacement, the support structure and the supported structure When the replacement support device is provided between the objects, the jack-up operation of the supported structure can be made unnecessary. Further, when the load of the supported structure is replaced by a newly installed replacement support device from the existing support device, the jack-up operation of the supported structure can be made unnecessary. Therefore, it is possible to eliminate the need for a cradle for use in jacking up the supported structure, greatly reducing the number of steps required to replace the support device and shortening the construction period. It becomes possible to plan.
(2) A sole plate attached to a required portion of a supported structure supported by an existing support device, a pedestal for installation on the support structure immediately below the sole plate, and a support attached on the pedestal A replacement support device having a configuration including a main body and a filling material to be inserted into a filling material filling space formed between the upper surface of the upper collar of the support main body and the lower surface of the sole plate. This makes it possible to easily realize the replacement support device used for carrying out the above-described support device replacement method (1).
(3) Filling the filling material by using a curable fluid as a filling material to be inserted into the filling material filling space formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate. By injecting and filling the space filling material into the space portion in a state having fluidity, the operation of putting the space filling material into the space filling material space space can be facilitated, and the above (1) The replacement support device used in the illustrated replacement method of the support device can be more reliably formed with a vertical dimension corresponding to the interval between the support structure and the supported structure.
(4) A configuration in which a weir portion is provided on the upper surface side of the outer peripheral edge portion of the upper collar of the support main body to surround the filling material filling space formed between the upper surface of the upper collar and the lower surface of the sole plate; This makes it possible to suppress the outflow of the intercalating material when the intercalating material, which is a curable fluid, is put into the intercalating material filling space, and the intercalating material can be easily transferred to the intercalating material filling space. Can be filled. Moreover, the said filling material can be hardened in the state hold | maintained reliably in the said filling material filling space part. Furthermore, when a large load in the vertical direction acts on the cured filling material, an effect of exerting a volume restraining effect that restrains deformation of the cured filling material in the horizontal direction can be expected.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 (a) (b) to FIG. 6 show an embodiment of the replacement method of the support device of the present invention and the replacement support device used in the method, as shown in FIGS. 8 (a), (b), (c) and FIG. In the same manner as shown in FIG. 9, the existing support device 10 provided in the portion for supporting the load of the main girders 4, 5, 6 as the supported structure is replaced with the steel pier 1 as the supporting structure. This indicates the case for construction, as follows.

  That is, FIGS. 1 (a) and 1 (b) show a replacement support device 21 used in the replacement method of the support device of the present invention, and the same steel pier 1 as shown in FIGS. A pedestal 11 installed at a required position directly below the final support position of each of the main girders 4, 5, 6 on the upper surface of the additional lateral beam 14 as an additional support structure; and a support body 22 attached to the upper side of the pedestal 11; A sole plate 23 to be attached to the lower end of the final support position of the main girders 4, 5, 6 as a supported structure, and further, an upper surface of the upper collar 22 a of the support body 22 and a lower surface of the sole plate 23 It is set as the structure provided with the filling material 25 with which the filling material filling space part 24 formed as a clearance gap of an up-down direction required space is filled.

  Specifically, for example, the non-shrinking mortar 25 is used as the interlining material 25 as a curable fluid having no shrinkage or a very small shrinkage rate at the time of curing.

  The above-mentioned sole plate 23 is, for example, a rectangular flat plate having a required thickness dimension, and is mounted with a required dimension protruding outward in the horizontal direction from an upper end portion of a required side surface, for example, an upper end portion of a pair of opposing side surfaces. It is the structure provided with the part 23a. Thereby, in the state which has arrange | positioned the said sole plate 23 under the lower flange used as the lower end part of the last support position of each main girder 4,5,6 as the said supported structure, Each attachment portion 23a is attached to the lower flange of each of the main girders 4, 5 and 6 by a required attachment means (not shown) such as a bolt so as to be integrated.

  The support body 22 has an upper collar 22a that is a square that is slightly larger than the planar shape of the lower end portion of the sole plate 23. Further, on the upper surface of the outer peripheral edge portion of the upper rod 22a, a weir portion 26 protruding upward in a required dimension is integrally provided. Thus, the lower end portion of the sole plate 23 can be inserted into the inside of the dam portion 26 from above, and a filling material serving as a gap between the upper surface of the upper collar 22a and the lower surface of the sole plate 23 is provided. When the filling space portion 24 is formed, the upper end position of the weir portion 26 is set higher than the lower end position of the sole plate 23, so that the weir portion 26 is surrounded around the filling material filling space portion 24. Can be surrounded by. Therefore, when filling the non-shrinking mortar 25 serving as the packing material into the packing material filling space 24, the non-shrinking mortar 25 having fluidity before curing is stored inside the weir 26, The non-shrinking mortar 25 before curing can be easily filled into the filling material filling space 24, and the non-shrinking mortar 25 is securely placed in the filling material filling space 24. It can be cured while being held. Further, after the non-shrinkable mortar 25 filled in the space filling material filling space 24 is cured, the cured non-shrinkable mortar 25 is cured by the weir portion 26 disposed around the cured non-shrinkable mortar 25. In contrast, when a large load in the vertical direction is applied, an effect of constraining deformation in the horizontal direction according to the Poisson's ratio of the hardened non-shrinkable mortar 25 and exhibiting a volume restraining effect can be expected. .

  Further, the thickness dimension of the sole plate 23, the height dimension from the lower end of the support body 22 to the upper surface of the upper rod 22a excluding the dam portion 26 and the boss 30 described later, and the height dimension of the pedestal 11 are: The sum of each dimension is determined from the upper surface of the additional horizontal beam 14 added to the steel pier 1 and the end of the existing supporting device 10 and the end on the existing girder brackets 9a, 9b, 9c provided on the horizontal beam 3 of the steel pier 1. The required dimension, for example, about 20 to 30 mm, is smaller than the vertical dimension to the lower flange lower surface of the full web portion which is the final support position of each main girder 4, 5, 6 supported via the cross beam 8. It is like that. As a result, the upper side of the upper main body 22a of the support body 22 installed on the upper surface of the additional horizontal beam 14 via the pedestal 11 and the lower flange lower surface of the final support positions of the main girders 4, 5 and 6 are attached. Between the bottom surface of the sole plate 23 in a state, the filling material filling space portion 24 can be formed as a gap having a vertical dimension of about 20 to 30 mm. The filling of the non-shrinking mortar 25 as a filling material into the filling material filling space 24 formed between the upper surface of the upper collar 22a of the support body 22 and the lower surface of the sole plate 23 If the filling material filling space 24 can be filled without any gaps, for example, through an injection hole (not shown) penetrating through a required portion of the lower flange of each of the sole plate 23 and the main girders 4, 5 and 6 described above. It can be press-fitted, or can be press-fitted through a clearance between the sole plate 23 and the weir portion 26 provided in the upper collar 22a of the support body 22, or the above-mentioned positions can be inserted into the required positions of the upper collar 22a and the sole plate 23 of the support body 22. Arbitrary filling means such as press-fitting from the injection port may be adopted as a configuration in which an injection port for communicating with the filling material filling space 24 is provided in advance.

  The plane sizes of the sole plate 23 and the support body 22 are determined according to the vertical load that acts on the replacement support device 21 from the main girders 4, 5 and 6 as supported structures. The surface pressure acting on the sole plate 23, the support body 22, and the non-shrink mortar 25 as a filling material between the both is within an allowable range of the pressure resistance of the sole plate 23, the support body 22 and the non-shrink mortar 25. It is assumed that it is appropriately set so as to be within the range.

  Further, a screw hole 27 is provided at a required portion of the upper surface of the upper collar 22a of the support body 22, while a portion corresponding to the screw hole 27 in the lower flange of the sole plate 23 and the main girders 4, 5, 6 is provided. Is provided with a bolt hole (bolt insertion hole) 28, and a set bolt 29 inserted from above into the lower flange of each of the main girders 4, 5, 6 and the bolt hole 28 of the sole plate 23 attached to the lower side thereof. The support body 22 disposed below the sole plate 23 is suspended by the set bolt 29 by screwing the tip end (lower end) of the support body 22 into the screw hole 27 of the upper collar 22a of the support body 22. Can be held.

  As shown in FIG. 1 (a), a boss 30 as a shear restraining member is provided at the center of the upper surface of the upper collar 22a of the support body 22 between the upper surface of the upper collar 22a and the lower surface of the sole plate 23. The interspaced material filling space 24 is formed with a vertical dimension that is larger than the vertical dimension of the filling material space 24, and the center plate of the sole plate 23 is fitted with a shape corresponding to the cross-sectional shape of the boss 30. It is good also as a structure which provided the hole 31. FIG. In this way, when the sole plate 23 and the support body 22 are arranged side by side in the vertical direction, the upper portion of the boss 30 provided on the upper collar 22a of the support body 22 is fitted to the sole plate 23. By inserting and fitting into the hole 31 from below, it is attached to the upper collar 22a of the support body 22 attached to the additional lateral beam 14 of the steel pier 1 via the pedestal 11 and the main girders 4, 5 and 6 described above. When a load to be displaced in the horizontal direction acts between the sole plate 23 and the sole plate 23, the load is received by fitting the boss 30 of the upper collar 22 a and the fitting hole 31 of the sole plate 23. You may be able to.

  Other configurations are the same as those shown in FIG. 9, and the same components are denoted by the same reference numerals.

  When performing replacement work of a support device using the replacement support device 21 of the present invention having the above-described configuration, first, as shown in FIGS. 2 (A) and 2 (B), FIG. (C) A wide additional horizontal beam extending below the horizontal beam 3 of the steel pier 1 of the 3-main I girder bridge as shown in FIG. 9 to the lower position of the full web portion of the middle main girder 5 in the bridge axis direction. 14 is disposed, and the upper end thereof is integrally attached to the lower end of the horizontal beam 3, and both end portions in the bridge width direction of the additional horizontal beam 14 are fixed integrally to the both pillars 2. In addition, the base 11, the support body 22, and the sole plate 23, which are constituent elements of the replacement support device 21 of the present invention, are prepared in advance, and a non-shrink mortar 25 for use as a filling material is separately provided. Have it ready.

  After providing the additional horizontal beam 14 as described above, as shown in FIGS. 3 (A) and 3 (B), it is located above both ends in the bridge axis direction of the additional horizontal beam 14 in the main girders 4, 5 and 6. The full web portion to be set is set at the final support position, and the attachment portion 23a of the sole plate 23 is attached to the lower surface of the lower flange of the final support position by a required attachment means (not shown) such as a bolt. Further, on the both side surfaces and the lower flange of the web at the final support position of each of the main girders 4, 5 and 6, the stiffener 18 on the fulcrum is provided in the same manner as shown in FIGS. The reinforcing ribs 20 are attached to the both side surfaces of the web and the lower flange in the vicinity of both sides in the bridge axis direction of the stiffener 18 on the fulcrum. At this time, among the main girders 4, 5 and 6, in the case of the middle main girder 5, as shown in FIG. Among the ribs 20 provided in advance on both side surfaces and the lower flange of the above-mentioned, the existing flange provided along the notch portion 7 of the middle main girder 5 as a rib provided closer to the spar end than the stiffener 18 above the fulcrum May be used as they are. In this way, the number of ribs 20 newly provided in the middle main girder 5 can be halved, so that the labor and time required for the work for providing the ribs 20 in the middle main girder 5 can be reduced.

  Next, as shown in FIG. 4 (a) (since the subsequent steps are common to the main girders 4, 5, and 6, for convenience of illustration, FIGS. 4 (a) to (b) through FIG. (2) only the figure corresponding to (b) is shown to explain the steps to be carried out for each of the main girders 4, 5 and 6.), the support body 22 is arranged below the sole plate 23, and the support The boss 30 protruding from the upper surface of the upper collar 22a of the main body 22 is inserted into the fitting hole 31 provided in the sole plate 23, and the weir 26 provided at the outer peripheral edge of the upper surface of the upper collar 22a. Are arranged around the lower end portion of the sole plate 23, and the tip end portions of the set bolts 29 inserted from above into the lower flanges of the main girders 4, 5, 6 and the bolt holes 28 of the sole plate 23, respectively. The screw hole 27 provided in the upper collar 22a of the support body 22 By screwed, to hold the said supporting approval body 22 so as to suspend temporarily the lower side of the respective sole plate 23.

  Next, as shown in FIG. 4 (b), the base 11 is inserted and temporarily installed between the upper surface of the additional horizontal beam 14 and the lower end of the support body 22.

  When the pedestal 11 is arranged below the support body 22 as described above, by loosening the set bolt 29, the support body 22 is lowered by its own weight as shown in FIG. In this state, the lower end portion of each support body 22 is fixed to the upper end portion of the corresponding base 11 by a required fixing means such as welding and integrated. As a result, a filling material filling space 24 as a gap is formed between the upper surface of the upper collar 22a of the support body 22 fixed on the pedestal 11 and the lower surface of the sole plate 23. Become.

  After the filling material filling space 24 is formed, the non-shrinking mortar 25 is filled into the filling material filling space 24 without a gap as shown in FIG.

  After the non-shrink mortar 25 filled in the space filling material space 24 is cured and strength is developed, the lower end portion of the pedestal 11 is fixed to the additional horizontal beam 14 by a required fixing means such as welding. And integrate. As a result, the sole plate 23, the non-shrinking mortar 25 expressing the strength, the support body 22 and the pedestal 11 are provided between the additional lateral beam 14 and the lower flange of the final support position of the main girders 4, 5 and 6. The replacement support device 21 of the present invention having a structure in which the two are integrally connected in the vertical direction and having a strength capable of withstanding a large vertical load includes the upper surface of the additional horizontal beam 14 and the existing beam support on the horizontal beam 3. The lower flanges of the final support positions of the main girders 4, 5 and 6 are supported by the brackets 9a, 9b and 9c via the existing support device 10 and the end cross beam 8 (see FIG. 2 (a)). It is formed with a vertical dimension that matches the distance from the lower surface.

  Therefore, after that, the existing support device 10 that transmits and supports the loads of the main girders 4, 5, 6 to the girder brackets 9a, 9b, 9c installed on the cross beam 3 is used for gas cutting or the like. When the strength is gradually reduced by gradually cutting with the required cutting means, the loads of the main girders 4, 5 and 6 are gradually applied from the existing support device 10 to the replacement support device 21. When the load transmission path to the beam receiving brackets 9a, 9b, 9c of the cross beam 3 through the existing support device 10 is completely cut off, the main beams 4, 5, 6 are replaced. All the loads are transmitted to and supported by the additional lateral beam 14 via the replacement support device 21.

  Therefore, after that, as shown in FIG. 6, the existing support device 10 and the existing girder brackets 9a, 9b, and 9c are completely removed to replace the existing support device 10 with a new one. The replacement work of the support device to the service support device 21 is completed. Moreover, what is necessary is just to carry out transfer, replacement | exchange, etc. of each existing end cross beam 8 (refer FIG. 2 (A)) as needed.

  Thus, according to the replacement method of the support device of the present invention and the replacement support device used in the method, the existing support device on the girder brackets 9a, 9b, 9c provided on the cross beam 3 of the steel pier 1 is provided. 10 between the lower flange lower surface of the final support position set to each main girder 4, 5, 6 supported via 10 and the upper surface of the additional lateral beam 14 added to the steel pier 1. Therefore, the replacement support device 21 having a vertical dimension that coincides with each other can be installed, so that the replacement support device 21 is disposed below the final support position of each of the main girders 4, 5, 6. In this case, the operation of jacking up each main girder can be eliminated.

  In addition, after the replacement support device 21 is provided between the lower flange lower surface of the final support position of each of the main girders 4, 5 and 6 and the upper surface of the additional lateral beam 14 to be added to the steel pier 1, By gradually cutting the existing support device 10, the loads of the main girders 4, 5, 6 can be replaced with the replacement support device 21 newly provided from the existing support device 10. Therefore, even when the existing girder brackets 9a, 9b, 9c provided on the support device 10 and the cross beam 3 of the steel pier 1 are removed, the main girder 4, 5, 6 is jacked up. Can be made unnecessary.

  As described above, in the support device replacement method according to the present invention, it is not necessary to perform the jack-up operation of each of the main girders 4, 5 and 6. Therefore, the conventional support device replacement as shown in Non-Patent Document 1 is required. The jacking cradle used exclusively for jacking up the main girders 4, 5 and 6 as required by the construction method is no longer necessary, greatly reducing the process required to replace the support device. This makes it possible to shorten the construction period.

  Further, the middle main girder 5 is adapted to change the supporting position from the end of the girder where the notched portion 7 which is the initial supporting position by the existing supporting device 10 is provided to the full web portion. A full web process for reinforcing the notch 7 can be eliminated, and this also reduces the process required for the replacement work of the support device, thereby shortening the construction period.

  In the above embodiment, the case where the non-shrink mortar 25 is used as the interlining material is shown. However, the interlining material 25 is a non-shrinkable or curable fluid having a very small shrinkage rate at the time of curing. In addition, the main girder 4, 5, 6 acts in a state in which the filling material filling space 24 formed between the upper surface of the upper collar 22 a of the support body 22 and the lower surface of the sole plate 23 is filled. Any curable fluid such as epoxy resin or any other curable fluid may be used as long as it has pressure resistance capable of withstanding a vertical load.

  Further, instead of the curable fluid filling material 25, a solid filling material made of steel or the like having a pressure resistance capable of withstanding a vertical load acting from each of the main girders 4, 5, 6 is used. May be. That is, as shown in FIG. 7, the support body 22 is installed on the additional horizontal beam 14 via the base 11, and the sole plate 23 is attached to the lower surface of the lower flange of each main girder 4, 5, 6. By attaching, a filling material filling space portion 24 is formed as a gap between the upper surface of the upper collar 22a of the support body 22 and the lower surface of the sole plate 23, and then the filling material filling space portion 24 is formed. The solid filling material 25a made of steel or the like so as to have a thickness dimension corresponding to the vertical dimension of the material is pushed into the filling material filling space 24 from the side, and the filling material 25a is inserted as necessary. By fixing to one or both of the upper collar 22a and the sole plate 23 of the support body 22 with a required fixing means such as welding, the upper surface of the additional lateral beam 14 and the final supports of the main girders 4, 5, 6 are provided. Position Between the lower surface of the flange, the sole plate 23, the interlining material 25a, the support main body 22 and the base 11 are connected in the vertical direction, have a strength capable of withstanding a large vertical load, and the expanded lateral beam The replacement support device 21 of the present invention having a vertical dimension corresponding to the distance between the upper surface of 14 and the lower flange lower surface of the final support position of each of the main girders 4, 5, 6 may be formed. Good. In addition, when using such a solid filling material 25a, it is necessary to push the said filling material 25a into the said filling material filling space part 24 from the side, and the outer periphery of the upper collar 22a of the said support main body 22 The dam portion 26 on the upper surface side of the portion may be omitted. When the boss 30 is provided at the center of the upper surface of the upper collar 22a of the support body 22, the interlining material 25a is divided into two or more divided structures so that each divided body interferes with the boss 30. A notch such as a semi-circle or a fan shape may be provided to prevent this.

  Note that the present invention is not limited to the above-described embodiment, but is relatively horizontal between the upper collar 22a of the support body 22 and the sole plate 23 attached to each of the main girders 4, 5, and 6. From the viewpoint of improving the proof strength against the load acting in the direction to be displaced, the boss 30 is provided on the upper collar 22a of the support body 22, and the boss 30 of the upper collar 22a is fitted to the sole plate 23. However, the boss 30 of the upper collar 22a and the fitting hole 31 of the sole plate 23 may be omitted.

  Further, in the above embodiment, the weir portion 26 for surrounding the filling material filling space 24 is integrally provided at the outer peripheral edge of the upper surface of the upper collar 22a of the support body 22, When filling the non-shrinking mortar 25 as a filling material into the above-described filling material filling space 24 without the weir portion 26 of the ridge 22a, the non-shrinking mortar 25 is surrounded around the filling material filling space 24. A form for preventing the outflow may be provided.

  When both the weir portion 26 and the boss 30 on the upper surface side of the upper collar 22a of the support main body 22 are omitted as described above, the last of the main girders 4, 5, 6 as shown in FIGS. After the sole plate 23 is attached to the lower surface of the lower flange of the support position, as shown in FIG. 4 (a), the support body 22 is once attached to the sole plate 23 with a set bolt 29. 4 (b), the base 11 is inserted between the support body 22 attached to the sole plate 23 and the upper surface of the additional horizontal beam 14, and then the set bolt as shown in FIG. 5 (a). In place of the step of loosening 29 and placing the support body 22 on the pedestal 11, the final support positions of the main girders 4, 5 and 6 as shown in FIGS. A sole plate 23 is attached to the lower surface of the lower flange. After, between the upper surface of the lower surface and expansion crossbeam 14 of the sole plate 23, the base 11 and the bearing body 22, may be arranged by inserting from the side collectively in a state of sequentially or superimposed.

  In the above embodiment, as shown in FIG. 5 (b), after filling the non-shrink mortar 25 as the filling material into the filling material filling space 24, the lower end portion of the base 11 is attached to the additional horizontal beam 14. 4A and 4B, the upper surface of the additional horizontal beam 14 and the lower end of the support body 22 once attached to the sole plate 23 are fixed. When the pedestal 11 is inserted between them, the lower end of the pedestal 11 may be fixed to the upper surface of the additional horizontal beam 14 by a required fixing means such as welding.

  The replacement method of the support device of the present invention is the replacement of the support device 10 used to support the box girder as the supported structure on the steel bridge pier as the support structure in the box girder bridge. It may be applied to construction. Further, the supported structure is supported on the upper side of the support structure via the existing support device 10 and the final support position of the supported structure by the replacement support device 21 newly provided by the support replacement work is provided. As long as it can be set at a location different from the original support position by the existing support device 10, the supported structure on any support structure other than the support portions of the main girders 4, 5, 6 by the steel pier 1 in the steel bridge It may be applied to the replacement work of the supporting device that supports

  Of course, various modifications can be made without departing from the scope of the present invention.

As one embodiment of the replacement method of the support device of the present invention and the replacement support device used in the method, the replacement method of the support device provided at the portion where the main girder is supported by the steel pier of the I-girder bridge (A) is a partially cut schematic side view showing a replacement support device used in the replacement method, and (b) is a support in the replacement support device of (a). It is a cutaway side view which expands and shows the upper end part of a main part. FIG. 1 shows the procedure of the replacement method of FIG. 1, (a) a schematic plan view showing a state in which an additional horizontal beam is provided below the horizontal beam of the steel pier, and (b) is a view in the direction of arrow AA in (a). FIG. Fig. 2 shows the procedure following Fig. 2 (a) and (b) in the replacement method of Fig. 1, (a) shows the state where the sole plate is attached to the lower end of the final support position of the outer main girder, and (b) shows It is a schematic side view which respectively shows the state which attached the sole plate to the lower end part of the last support position of a middle main girder. FIG. 3 shows the procedure following FIG. 3 (A) and (B) in the replacement method of FIG. 1, (A) is a partially cut schematic side view showing a state in which the support body is attached to the lower side of the sole plate; ) Is a partially cut schematic side view showing a state in which a pedestal is installed on the upper surface of the additional horizontal beam. Fig. 4 shows the procedure following Fig. 4 (b) in the replacement method of Fig. 1; (a) attaches a support body to the upper side of the pedestal and forms a space filling material space between the upper collar and the sole plate. (B) is a partially cut schematic side view showing a state in which a non-shrinkable mortar is filled in the filling material filling space to form a replacement support device. . FIG. 5 shows the procedure following FIG. 5 (b) in the replacement method of FIG. 1, and shows a state in which the load of the main girder is replaced in the replacement support device and the existing support device and the girder bracket are removed. FIG. FIG. 5 is a partially cut schematic side view showing another example of a replacement support device used in a replacement method for a support device as another embodiment of the present invention. As an example of a multi-main I girder bridge, an outline of a three main I girder bridge conventionally used on the Metropolitan Expressway, etc. is shown, (A) is a plan view, and (B) is a BB direction of (A). An arrow view and (c) are CC view arrow views of (a). It is a schematic side view which expands and shows the support apparatus provided in the part which makes a steel bridge pier support a main girder in 3 main I girder bridges of FIG. This figure shows a state where an additional horizontal beam is installed under the horizontal beam of the steel pier in the conventional method of replacing the main girder as a full girder construction. (B) is a schematic plan view, (b) (A) It is a DD direction arrow directional view. It shows the state where each main girder is jacked up in the construction of main girder full web. (B) is a schematic plan view, (b) is a view taken in the direction of arrows EE in (b), (c) is ( It is a FF direction arrow directional view of a). This shows the state where each main girder is placed on the upper side of the newly installed support device on the additional horizontal beam after the medium main girder is made full web in the main girder full web construction. The figure, (B) is a GG direction arrow view of (A), and (C) is an HH direction arrow view of (A).

Explanation of symbols

1 Steel pier (support structure)
4, 5, 6 Main girder (supported structure)
10 Bearing device (existing bearing device)
11 Pedestal 14 Additional lateral beam (support structure)
DESCRIPTION OF SYMBOLS 21 Replacement support device 22 Support main body 22a Upper collar 23 Sole plate 24 Filling material filling space 25 Non-shrink mortar (spacing material)
25a Filling material 26 Weir part

Claims (5)

  A sole plate is attached to a required portion of a supported structure supported by an existing support device, a base is provided on the support structure below the sole plate, and a support body is attached to the upper side of the base. The support structure is formed by forming a filling material filling space between the upper surface of the upper collar of the support body and the lower surface of the sole plate, and then inserting the filling material into the filling material filling space. A replacement support device comprising the pedestal, the support body, the padding material, and the sole plate between the object and the supported structure, and having a vertical dimension corresponding to the distance between the support structure and the supported structure. And then gradually breaking the transmission path of the load to the support structure via the existing support device of the supported structure, so that the load of the supported structure is transferred from the existing support device. Gradually move to the replacement bearing device Instead, the replacement method of the bearing device, characterized in that so as to be supported transmitted to support structure via a replacement for bearing device loads 該被 support structure.   The replacement of the bearing device according to claim 1, wherein a curable fluid is used as a spacing material to be inserted into a spacing material filling space formed between the upper surface of the upper collar of the bearing body and the lower surface of the sole plate. Construction method.   A sole plate attached to a required portion of a supported structure supported by an existing support device, a pedestal for installation at a position directly below the sole plate on the support structure, and a support body attached on the pedestal; A support apparatus for replacement comprising a padding material for insertion into a padding material filling space formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate. .   4. The replacement support device according to claim 3, wherein the filling material inserted into the filling material filling space formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate is a curable fluid.   The dam part surrounding the filling material filling space part formed between the upper surface of the upper collar and the lower surface of the sole plate is provided on the upper surface side of the outer peripheral edge of the upper collar of the support body. Replacement bearing device.

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