JP5078863B2 - Replacement method of support device and replacement support device used in the method - Google Patents

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. 15, 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 by the horizontal beam 3 of the steel pier 1 within the vertical dimension of the horizontal beam 3. The height positions of the upper and lower ends of the main girder and the height positions of the upper and lower ends of the main girders 4, 5 and 6 can be aligned. I can do it. 14 (a), 14 (b), and 14 (c), the illustration of the 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 shown in FIGS. 14 (a), 14 (b), and 15 above, the deterioration of 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 procedure shown in FIGS. 16 (a) (b) to 18 (a) (b) (c). That is, first, as shown in FIGS. 16 (A) and 16 (B), the cross beam 3 of the steel pier 1 in the I girder bridge having the same configuration as that shown in FIGS. 14 (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 position directly below the main girders 4, 5 and 6 on each bridge axis direction surface of the additional horizontal beam 14, individual jack-up cradles 15a, 15b and 15c are provided for the middle main girder 5. 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. 17 (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 that has received 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. 18 (c), at the positions of the outer main girders 4 and 6 at the end of the girders above the additional lateral beam 14 and above the new support 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 reinforcing ribs 20 are further attached to both sides of the web and lower flanges in the vicinity of both sides in the bridge axis direction.

  After completion of the full web at the end of the middle main beam 5 as described above, as shown in FIGS. 18 (a), (b), and (c), the main beams 4, 5, 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. 15 is provided at a predetermined position immediately 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, 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 are moved or 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. 16 (a) to (b) to FIGS. 18 (a), (b), and (c), the girder bracket 9a provided on the cross beam 3 of the steel pier 1 is provided. , 9b, 9c, the original vertical position of the main girders 4, 5 and 6 supported by the existing support device 10 directly or through the end cross beam 8 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 dimension 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; And, for the operation of once jacking up at a location different from the final support position by each of the new support devices 19, the extension lateral beam 14 is dedicated to the jack-up operation of the main girders 4, 5 and 6. It is necessary to provide the temporary jackup cradles 15a, 15b, and 15c to be used. Therefore, the steel materials and the manufacturing costs required for the production of the respective jackup cradles 15a, 15b, and 15c increase, and the above jackups Actually, it takes time and effort to install and remove the 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. An object of the present invention is to provide a replacement method for a support device and a replacement support device used for the method so that it is not necessary to provide a cradle for jack-up used exclusively for jacking up an object. is there.

  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 having a jack insertion portion is disposed on the object, and a support body is attached to the upper side of the pedestal, and a space filling material filling space is provided between the upper surface of the upper surface of the support body and the lower surface of the sole plate. And then, between the supporting structure and the supported structure, the pedestal, the support body, the packing material, and the sole plate are inserted into the packing material filling space. And a support device for replacement having a vertical dimension corresponding to a distance between the support structure and the supported structure is formed, and then, the above-mentioned entire pedestal is removed by a jack inserted into a jack insertion portion of the pedestal. Replace the support device The supported structure is jacked up via the replacement support device, and then the existing support device is removed, and then the replacement support device and the supported structure are removed by the jack. This is a support device replacement method in which the support structure is supported by the support structure through the support device for replacement by jacking down.

  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.

  Further, corresponding to claim 3, a sole plate attached to a required portion of a supported structure supported by an existing support device, a pedestal for placing on a support structure below the sole plate, A support body to be mounted on the pedestal; and a filling material for placing in 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; The replacement support device has a configuration in which a jack insertion portion is provided below the pedestal top plate so that the pedestal itself can be jacked up by the jack inserted into the jack insertion portion.

  Further, in the configuration of the replacement support device described above, the 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 is a curable fluid. The configuration.

  Furthermore, in the structure of the replacement support device described above, a space filling material 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 dam part which surrounds.

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, and a pedestal having a jack insertion portion is disposed on the support structure below the sole plate, A support body is attached to the upper side of the pedestal so that a space filling material space is formed between the upper surface of the upper surface of the support body and the lower surface of the sole plate, and then the space between the space between the space filling materials is formed. By inserting the stuffing material, the pedestal, the support body, the stuffing material, and the sole plate are formed between the support structure and the supported structure, and according to the distance between the support structure and the supported structure. Forming a replacement support device having a vertical dimension, and then jacking up the replacement support device together with the pedestal with a jack inserted and disposed in the jack insertion portion of the pedestal. Through Jack up the supported structure, and then remove the existing support device, then jack down the replacement support device and the supported structure with the jack to replace the supported structure. Since it is a replacement method for the support device, which is supported by the support structure via the device, it is supported at the installation location of the support structure for replacement that finally supports the supported structure. Since the structure can be jacked up, there is no need to provide a cradle for exclusive use in jacking up the supported structure. Therefore, the process required for the replacement work of the support device can be greatly reduced, and the construction period can be shortened.
(2) A sole plate attached to a required portion of a supported structure supported by an existing support device, a pedestal for placement on a support structure below the sole plate, and a support body attached on the pedestal And a filling material for inserting 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, and further, the pedestal is disposed below the pedestal top plate. (1) The method for replacing a support device according to (1) above, wherein a replacement support device having a jack insertion portion and having a configuration in which the base itself can be jacked up by a jack inserted into the jack insertion portion. It is possible to easily realize the replacement support device used in the implementation of the above. (3) Filling the filling material by using a curable fluid as the 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 body so as 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 hardened spacing material, an effect of exerting a volume restraining effect that restrains deformation of the cured spacing 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.

  FIGS. 1 to 11 are the same as those shown in FIGS. 14 (a), (b), (c) and FIG. 15 as one embodiment of the replacement method of the support device of the present invention and the replacement support device used in the method. In addition, the case where the existing support device 10 provided in the portion for supporting the load of the main girders 4, 5, 6 as the supported structure on the steel pier 1 as the supporting structure is to be replaced. It is shown as follows.

  That is, FIGS. 1 to 4 show a replacement support device 21 used in the replacement method of the support device of the present invention, and the support to be added to the steel pier 1 similar to that shown in FIGS. A pedestal 22 is provided on a top surface of the additional horizontal beam 14 as a structure, which is located immediately below the final support position of each of the main girders 4, 5 and 6, and the pedestal 22 has a substantially gate shape in cross section. In addition, the jack 25 is inserted into the jack insertion portion 24 so that the pedestal 22 itself can be jacked up as a configuration comprising the jack insertion portion 24 in which the jack 25 can be inserted and removed from the side below the pedestal top plate 23. To. Furthermore, a support body 26 attached to the upper side of the pedestal 22, a sole plate 27 attached to the lower end of the final support position of the main girders 4, 5 and 6 as supported structures, and an upper surface of the upper collar 26a of the support body 26 And a filling material 29 for filling a filling material filling space 28 formed as a gap having a required dimension in the vertical direction between the bottom plate 27 and the lower surface of the sole plate 27.

  More specifically, the pedestal 22 is a flat surface as shown in FIGS. 2 and 3 (a), (b), and (c), for example, when the bearing body 26 having a circular bottom shape is used as the bearing body 26. A substantially semicircular pedestal top plate 23 that covers the entire load bearing wall member 30 is attached to the upper side of the load bearing wall member 30 having a U-shaped shape and having a required height in the vertical direction. A base member 31 that is curved in a U-shape in a horizontal plane along the load bearing wall member 30 with a required width wider than the thickness dimension in the inner and outer directions of the load bearing wall member 30 is attached to the lower side. The jack 25 can be inserted and removed from the side through the opening portions of the load-bearing wall member 30 and the base member 31 that are planar U-shaped inside the load-bearing wall member 30 and the base member 31 that are planar U-shaped. Jack insertion part 4 is a formed configuration to. As a result, the jack 25 is inserted into the jack insertion portion 24 inside the pedestal 22 in a state where the pedestal 22 is disposed on the upper surface of the additional horizontal beam 14, whereby the jack 25 is connected to the upper surface of the additional horizontal beam 14 and the pedestal ceiling. It can be arranged between the plate 23. Therefore, the pedestal 22 itself can be jacked up above the additional lateral beam 14 by extending the jack 25 inserted and arranged in the jack insertion portion 24 of the pedestal 22 as described above.

  For example, a non-shrinking mortar 29 is used as the interlining material 29 as a curable fluid having no shrinkage or a shrinkage rate that is extremely small during curing.

  The sole plate 27 is, for example, a rectangular flat plate having a required thickness dimension, and is mounted so as to project a required dimension outwardly 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 27a. Thereby, in the state which has arrange | positioned the said sole plate 27 to the lower side of the lower flange used as the lower end part of the last support position of each main girder 4,5,6 as said to-be-supported structure, said Each attachment portion 27a can be integrated with the lower flange of each of the main girders 4, 5, 6 by a required attachment means (not shown) such as a bolt.

  In the support body 26, the upper collar 26a is a square that is slightly larger than the planar shape of the lower end portion of the sole plate 27. Further, a weir portion 32 projecting upward in the required dimension is integrally provided on the upper surface of the outer peripheral edge portion of the upper rod 26a. Thus, the lower end portion of the sole plate 27 can be inserted into the inside of the dam portion 32 from above, and the filling material is formed as a gap between the upper surface of the upper collar 26a and the lower surface of the sole plate 27. When forming the filling space portion 28, the upper end position of the dam portion 32 is set higher than the lower end position of the sole plate 27, so that the dam portion 32 is surrounded around the filling material filling space portion 28. Can be surrounded by. Therefore, when filling the non-shrinking mortar 29 as the filling material into the filling material filling space 28, the non-shrinking mortar 29 having fluidity before curing is stored inside the weir 32, The non-shrink mortar 29 before curing can be easily filled into the filling material filling space 28, and the non-shrinking mortar 29 is securely placed in the filling material filling space 28. It can be cured while being held. Further, after the non-shrink mortar 29 filled in the space filling material filling space 28 is cured, the cured non-shrink mortar 29 is formed by the weir portion 32 disposed around the cured non-shrink mortar 29. On the other hand, 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 29 and exhibiting a volume restraining effect can be expected. . Reference numeral 26b denotes a lower arm of the support body 26.

  Further, the thickness dimension of the sole plate 27, the height dimension from the lower end of the support body 26 to the upper surface of the upper rod 26a excluding the dam portion 32 and the boss 36 described later, and the height dimension of the pedestal 22 are: The sum of each dimension is obtained from the upper surface of the additional horizontal beam 14 added to the steel pier 1 and the end of the existing support 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 body 26a of the support body 26 installed on the upper surface of the additional horizontal beam 14 via the pedestal 22 and the lower flange lower surface of the final support positions of the main girders 4, 5 and 6 are attached. Between the lower surface of the sole plate 27 in a state, the filling material filling space portion 28 can be formed as a gap having a vertical dimension of about 20 to 30 mm. The filling of the non-shrinking mortar 29 as a filling material into the filling material filling space 28 formed between the upper surface of the upper collar 26a of the support body 26 and the lower surface of the sole plate 27 If the filling material filling space 28 can be filled without any gaps, for example, through an injection hole (not shown) penetrating through the sole plate 27 and a required portion of the lower flange of each of the main girders 4, 5, 6. It can be press-fitted, or can be press-fitted through a gap between the sole plate 27 and the weir portion 32 provided on the upper collar 26a of the support body 26, or can be inserted into a required position of the upper collar 26a or the sole plate 27 of the support body 26. Arbitrary filling means may be employed such as providing an inlet for communicating with the filling material filling space 28 in advance and press-fitting from the inlet.

  The plane size of the sole plate 27 and the support body 26 is determined depending on the vertical load that acts on the replacement support device 21 from the main girders 4, 5, and 6 as the supported structure. The surface pressure acting on the sole plate 27, the support body 26, and the non-shrink mortar 29 serving as a filling material between the two is within an allowable range of the pressure resistance of the sole plate 27, the support body 26, and the non-shrink mortar 29. It is assumed that it is appropriately set so as to be within the range.

  Further, a screw hole 33 is provided at a required position on the upper surface of the upper collar 26a of the support body 26, while a position corresponding to the screw hole 33 in the lower flange of the sole plate 27 and the main girders 4, 5, 6 is provided. Is provided with a bolt hole (bolt insertion hole) 34, and a set bolt 35 inserted from above into the lower flange of each of the main girders 4, 5, 6 and the bolt hole 34 of the sole plate 27 attached to the lower side thereof. The support body 26 arranged below the sole plate 27 is suspended by the set bolt 35 by screwing the tip end (lower end) of the support body 26 into the screw hole 33 of the upper collar 26a of the support body 26. Can be held.

  As shown in FIG. 1, a boss 36 as a shear restraining member is formed between the upper surface of the upper collar 26a and the lower surface of the sole plate 27 at the center of the upper surface of the upper collar 26a of the support body 26. While projecting with a vertical dimension that is larger than the vertical dimension of the filling material filling space 28, a fitting hole 37 having a shape corresponding to the cross-sectional shape of the boss 36 is formed at the center of the sole plate 27. It is good also as a provided structure. In this way, when the sole plate 27 and the support body 26 are arranged side by side in the vertical direction, the upper portion of the boss 36 provided on the upper collar 26a of the support body 26 is fitted to the sole plate 27. By inserting and fitting into the hole 37 from below, it is attached to the upper collar 26a of the support body 26 that is attached to the additional lateral beam 14 of the steel pier 1 via the pedestal 22 and the main girders 4, 5, and 6 described above. When a load is applied between the sole plate 27 and the sole plate 27 in a horizontal direction, the load is received by fitting the boss 36 of the upper collar 26 a and the fitting hole 37 of the sole plate 27. You may be able to.

  In addition, the same components as those shown in FIGS. 14 to 18 are denoted by the same reference numerals.

  When performing replacement work of the support device using the replacement support device 21 of the present invention having the above-described configuration, first, as shown in FIGS. 5 (a) and (b), FIG. (C) A wide additional horizontal beam extending below the horizontal beam 3 of the steel pier 1 of the three main I girder bridge as shown in FIG. 15 to the position below 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 pedestal 22, the support body 26, and the sole plate 27, which are constituent elements of the replacement support device 21 of the present invention, are prepared in a separated state, and a non-shrink mortar 29 for use as a filling material, and A jack 25 is prepared separately for use by inserting it into the jack insertion portion 24 of the pedestal 22.

  After providing the additional horizontal beam 14 as described above, as shown in FIGS. 6 (A) and 6 (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 mounting portion 27a of the sole plate 27 is mounted on the lower surface of the lower flange of the final support position by a required mounting means such as a bolt. Further, on the both side surfaces and the lower flange of the web at the final support position 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. 6 (b), the web in the vicinity of both sides in the bridge axis direction of the stiffener 18 on the fulcrum 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. 7 (a) (the subsequent steps are common to the main girders 4, 5, 6), for convenience of illustration, FIGS. (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 26 is arranged below the sole plate 27, and the support A boss 36 projecting from the upper surface of the upper collar 26a of the main body 26 is inserted into a fitting hole 37 provided in the sole plate 27, and a weir 32 provided at the outer peripheral edge of the upper surface of the upper collar 26a. Are arranged around the lower end portion of the sole plate 27, and the tip end portion of the set bolt 35 inserted through the lower flange of each of the main girders 4, 5, 6 and the bolt hole 34 of the sole plate 27 from above. The screw hole 3 provided in the upper collar 26a of the support body 26 By screwed in, to hold the said supporting approval body 26 so as to suspend temporarily the lower side of the respective sole plate 27.

  Next, as shown in FIG. 7B, a pedestal 22 is inserted and temporarily installed between the upper surface of the additional horizontal beam 14 and the lower end of the support body 26.

  When the pedestal 22 is arranged below the support body 26 as described above, the set body 35 is loosened to lower the support body 26 by its own weight as shown in FIG. In this state, the lower end portion of the lower collar 26b of each support body 26 is fixed and integrated with the upper end portion of the corresponding base 22 by a required fixing means such as welding. Thus, a filling material filling space 28 is formed as a gap between the upper surface of the upper collar 26a of the support body 26 fixed on the pedestal 22 and the lower surface of the sole plate 27. Become.

  After the filling material filling space 28 is formed, as shown in FIG. 8B, the filling material filling space 28 is filled with the non-shrink mortar 29 without a gap. As a result, when the non-shrink mortar 29 filled in the space filling material space 28 is cured and the strength is developed, the extension horizontal beam 14 and the final support positions of the main girders 4, 5 and 6 are set. Between the lower flange, the sole plate 27, the non-shrinkable mortar 29 expressing the strength, the support body 26 and the base 22 are integrally connected in the vertical direction, and have a strength capable of withstanding a large vertical load. Further, the replacement support device 21 according to the present invention includes an existing support device 10 and an end cross beam 8 (see FIG. 5A) on the upper surface of the additional horizontal beam 14 and the existing brackets 9a, 9b, and 9c on the horizontal beam 3. The main girder 4, 5, 6 in a state of being supported via a reference is formed with a vertical dimension that matches the distance from the lower surface of the lower flange of the final support position.

  After the replacement support device 21 is formed which matches the distance between the additional horizontal beam 14 and the lower flange of the final support position of each of the main girders 4, 5 and 6, as shown in FIG. As shown in FIG. 9 (b), the jack 25 is inserted into the jack insertion portion 24 of the base 22 in the replacement support device 21, and then the jack 25 is extended. As shown in FIG. The replacement support device 21 of the present invention in which the upper support body 26, the non-shrink mortar 29 cured in the filling state in the filling material filling space 28, and the sole plate 27 are integrated together with the base 22 is provided. By jacking up, the main girders 4, 5 and 6 to which the sole plate 27 at the upper end of the replacement support device 21 is attached at the final support position are jacked up.

  When the main girders 4, 5 and 6 are jacked up as described above, each of the above-described support devices 10 on the girder brackets 9a, 9b and 9c provided on the cross beam of the steel bridge pier 1 The loads from the main girders 4, 5 and 6 are transferred to the replacement support device 21 and the jack 25, so that the existing support device 10 and the girder brackets 9a, 9b and 9c have the main girders 4 respectively. In this state, the existing support device 10 and the existing girder brackets 9a, 9b, and 9c are removed in this state.

  Thereafter, as shown in FIG. 10B, when the jack 25 is contracted and the replacement support device 21 is jacked down together with the pedestal 22, the load of the main girders 4, 5, 6 is increased. It is transmitted to and supported by the additional lateral beam 14 via the replacement support device 21. Therefore, after that, as shown in FIG. 11, after the jack 25 is removed from the jack insertion portion 24 of the base 22 of the replacement support device 21, the lower end of the base 22 is welded to the additional lateral beam 14. It fixes and integrates by required fixing means, such as. As a result, the replacement work of the support device from the existing support device 10 to the replacement support device 21 newly provided is completed. Moreover, what is necessary is just to carry out transfer, replacement, etc. of each existing end cross beam 8 (refer FIG. 5 (A)) as needed.

  Furthermore, you may make it fill the jack insertion part 24 of the base 22 after fixing to the additional horizontal beam 14 in the said FIG. 11 with a non-shrink mortar (not shown). In this way, the rust prevention and protection inside the pedestal, and the effect of suppressing the bending and vibration caused by the fluctuating load caused by the automobile or the like of the pedestal top plate 23 in which the jack insertion portion 24 is provided below the pedestal 22 are provided. That is, an effect of suppressing fatigue damage due to aging can be expected.

  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. A replacement support device 21 having a vertical dimension that coincides with the above can be arranged, and the replacement support device 21 is configured by providing a jack insertion portion 24 on a pedestal 22 located at the lower end. Therefore, the final support position of each of the main girders 4, 5 and 6 is determined via the replacement support device 21 by the jack 25 inserted and arranged in the jack insertion portion 24 of the base 22 of the replacement support device 21. Can be jacked up. Therefore, when the load of the main girders 4, 5, 6 is transferred from the existing support device 10 to the replacement support device 21, the conventional support device replacement method as shown in Non-Patent Document 1 is used. Since the jack-up cradle used exclusively for the jack-up operation of the main girders 4, 5 and 6 as required in the above can be eliminated, the process required for the replacement work of the support device can be reduced. The construction period can be shortened.

  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.

  Further, since the pedestal 22 has a space for inserting the jack 25 below the pedestal top plate 23, it is not preferable that a large load acts on the pedestal top plate 23 locally. The lower collar 26b of the support body 26 can be used as a stress member for distributing and acting a load on the surface of the pedestal top plate 23. Therefore, since the lower collar 26b of the support body 26 is a thick plate member having high rigidity, it is possible to prevent the local stress from acting on the pedestal top plate 23 beforehand. The effect of reducing the thickness of the plate 23 can be expected.

  In the embodiment described above, the pedestal top plate 23 of the pedestal 22 is shown as having a substantially semicircular shape corresponding to the use of the support body 26 having a circular bottom shape. When using the above, the pedestal top plate 23 may be a square. In this case, the bearing wall member 30 and the base member 31 may be U-shaped in a planar shape along the three sides of the square pedestal top plate 23 instead of the U-shaped planar shape.

  Next, FIGS. 12 (a) and 12 (b) show another example of a pedestal used to constitute the replacement support device 21 in the embodiment of FIGS. 1 to 11 as another embodiment of the present invention. The following configuration is shown.

  That is, the pedestal 22a shown in FIGS. 12 (a) and 12 (b) is required as a planar cross shape that connects intermediate portions of the rectangular opposite sides of the pedestal top plate 23a below the rectangular plate-shaped pedestal top plate 23a. The upper end portion of the load bearing wall member 30a having the height dimension is integrally attached, and further, the lower end of the load bearing wall member 30a has a required width wider than the plate thickness dimension of the load bearing wall member 30a in the horizontal plane. By attaching and integrating the cross-shaped base member 31a along the load-bearing wall member 30a, each of the four corner portions of the load-bearing wall member 30a and the base member 31a as a planar cross-shaped disposed below the pedestal top plate 23a. Is configured as a jack insertion portion 24 in which the jack 25 can be inserted and removed from the side. Accordingly, by inserting the small jack 25 into each jack insertion portion 24 in a state where the pedestal 22a is disposed on the upper surface of the additional lateral beam 14, each jack 25 is connected to the upper surface of the additional lateral beam 14 and the pedestal. It can be arranged between the top plate 23a. Therefore, in the state where the jacks 25 are individually inserted and arranged in at least two of the jack insertion portions 24 in the diagonal direction among the four jack insertion portions 24 of the pedestal 22a, the respective jacks 25 are synchronously extended. By doing so, the pedestal 22a itself can be jacked up above the additional lateral beam 14.

  Therefore, since the pedestal 22a having the above configuration can be used in place of the pedestal 22 shown in the embodiment of FIGS. 1 to 11, the pedestal 22a of the present embodiment is used instead of the pedestal 22. The replacement support device 21 thus configured can also perform replacement work for the support device similar to that of the embodiment shown in FIGS. 1 to 11, and the same effect as that of the above embodiment can be obtained. .

  In each of the above-described embodiments, the case where the non-shrink mortar 29 is used as the interlining material has been described. However, the interlining material 29 is a non-shrinkable or curable fluid having a very small shrinkage rate at the time of curing. The main girder 4, 5, 6 acts in a state in which the filling material filling space 28 formed between the upper surface of the upper collar 26 a of the support device 22 and the lower surface of the sole plate 27 is filled. Any other curable fluid may be used as long as it has a pressure resistance capable of withstanding the vertical load.

  Further, instead of the curable fluid filling material 29, a solid filling material such as a steel material 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. 13, as shown in FIG. 8 (a), the lower collar 26b of the support body 26 is attached to the pedestal 22 temporarily installed on the expanded lateral beam 14, and the main girders 4, 5 are attached. , 6 with the sole plate 27 attached to the lower surface of the lower flange of the final support position, a filling material as a gap between the upper surface of the upper collar 26a of the support body 26 and the lower surface of the sole plate 27 After the filling space portion 28 is formed, a solid filling material 29a made of steel or the like so as to have a thickness dimension corresponding to the vertical dimension of the filling material filling space portion 28 is replaced with the above-described filling material filling space. The above-mentioned expansion is carried out by pushing into the part 28 from the side, and fixing the above-mentioned padding material 29a to one or both of the upper collar 26a and the sole plate 27 of the support body 26 with a required fixing means such as welding as required. side 14, the sole plate 27, the padding material 29a, the support body 26, and the pedestal 22 are connected in the vertical direction between the upper surface of 14 and the lower flange lower surface of the final support positions of the main girders 4, 5, and 6. The upper and lower sides of the upper and lower cross beams 14 have a strength that can withstand a large vertical load and match the distance between the upper surface of the additional lateral beam 14 and the lower flange lower surface of the final support positions of the main girders 4, 5, 6. A replacement support device 21 having a directional dimension may be formed. In the case of using such a solid filling material 29a, it is necessary to push the filling material 29a from the side into the filling material filling space 28, so that the outer peripheral edge of the upper collar 26a of the support body 26 is used. What is necessary is just to omit the weir part 32 on the upper surface side. When the boss 36 is provided at the center of the upper surface of the upper collar 26a of the support body 26, the interstitch material 29a is divided into two or more divided structures, and the boss 36 and A notch such as a semicircle or a fan shape may be provided to prevent the interference.

  The present invention is not limited only to the above-described embodiment, and is relatively horizontal between the upper collar 26a of the support body 26 and the sole plate 27 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 36 is provided on the upper collar 26a of the support body 26, and the boss 36 of the upper collar 26a is fitted on the sole plate 27. However, the boss 36 of the upper collar 26a and the fitting hole 37 of the sole plate 27 may be omitted.

  Further, in the embodiment of FIGS. 1 to 11, the weir portion 32 for surrounding the filling material filling space portion 28 is integrally provided on the outer peripheral portion of the upper surface of the upper collar 26a of the support body 26. However, when the non-shrinking mortar 29 as a filling material is filled in the filling material filling space portion 28 without the weir portion 32 of the upper flange 26a, the space around the filling material filling space portion 28 is You may make it provide the formwork for hardening in the state which prevented the outflow of the non-shrink mortar 29. FIG.

  When both the weir portion 32 and the boss 36 on the upper surface side of the upper collar 26a of the support body 26 are omitted as described above, the last of the main girders 4, 5 and 6 as shown in FIGS. After the sole plate 27 is attached to the lower surface of the lower flange of the support position, as shown in FIG. 7 (a), the support body 26 is once attached to the sole plate 27 with the set bolt 35. 7 (b), the pedestal 22 is inserted between the support body 26 attached to the sole plate 27 and the upper surface of the additional lateral beam 14, and then the set bolt as shown in FIG. 8 (a). 35, in place of the step of placing the support body 26 on the pedestal 22, the final support positions of the main girders 4, 5 and 6 as shown in FIGS. A sole plate 27 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 27, the pedestal 22 and the bearing body 26, may be arranged by inserting from the side collectively in a state of sequentially or superimposed.

  The pedestal of the replacement support device 21 can support the load acting from the replacement support device 21 itself and the main girders 4, 5 and 6, and the jack 25 is laterally provided below the pedestal top plates 23 and 23a. If the jack insertion portion 24 that can be taken in and out is provided and the pedestal itself can be jacked up by the jack 25 that is inserted and arranged in the jack insertion portion 24, FIG. 2 and FIG. 3 (a) (b) (c) A pedestal having any configuration other than the pedestal 22 having the configuration shown in FIG. 12 or the pedestal 22a having the configuration shown in FIGS. 12A and 12B may be used.

  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, and 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 FIG. 5 is a partially cut schematic side view showing a replacement support device used in a replacement method, showing an application example in the case of performing the replacement. It is a schematic perspective view which shows the base which comprises the support apparatus for replacement used with the replacement method of FIG. FIG. 3 shows the pedestal of FIG. 2, (A) is a schematic plan view, (B) is a schematic front view, and (C) is a schematic cut side view. It is a cutaway side view which expands and shows the upper end part of the upper collar of the support main body in the support apparatus for replacement used with the replacement | exchange method of FIG. 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. 5 shows the procedure following FIG. 5 (A) and (B) in the replacement method of FIG. 1, where (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. 6 shows the procedure following FIG. 6 (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. 7 shows the procedure following FIG. 7 (b) in the replacement method of FIG. 1, wherein (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. 9 shows the procedure following FIG. 8 (b) in the replacement method of FIG. 1, wherein (a) is a partially cut schematic side view showing a state in which the jack is inserted and arranged in the jack insertion portion of the base; FIG. 4 is a partially cut schematic side view showing a state in which a main girder is jacked up via a replacement support device using a jack. FIG. 9 shows the procedure following FIG. 9 (B) in the replacement method of FIG. 1, (A) is a partially cut side view showing a state in which the existing support device and girder bracket are removed, and (B) is the main girder. It is a partially cut schematic side view which shows the state which jacked down. FIG. 11 is a partially cut schematic side view showing the procedure following FIG. 10 (b) in the replacement method of FIG. 1, after the jack is removed and the pedestal is fixed on the additional lateral beam. As another form of implementation of this invention, another example of the base used for the support apparatus for replacement | exchange is shown, (A) is a schematic perspective view, (B) is a schematic plan view. It is a partially cut schematic side view which shows another example of the support apparatus for replacement used for the replacement construction method of a support apparatus as other form of implementation of this 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)
14 Additional horizontal beam (support structure)
DESCRIPTION OF SYMBOLS 21 Replacement support device 22,22a Base 24 Jack insertion part 25 Jack 26 Supporting body 26a Upper arm 27 Sole plate 28 Filling material filling space part 29 Non-shrink mortar (spacing material)
29a Filling material 32 Weir part

Claims (5)

  A sole plate is attached to a required portion of a supported structure supported by an existing support device, and a pedestal having a jack insertion portion is disposed on a supporting structure below the sole plate, and an upper side of the pedestal. A support body is attached to the support body, and a filling material filling space is formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate, and then the filling material is placed in the filling material filling space. The vertical dimension according to the interval between the support structure and the supported structure, including the pedestal, the support body, the padding material, and the sole plate, between the support structure and the supported structure. And then jacking up the replacement support device together with the pedestal with a jack inserted and arranged in the jack insertion portion of the pedestal, through the replacement support device. Above payee Jack up the structure, and then remove the existing support device, then jack down the replacement support device and the supported structure with the jack to replace the supported structure with the replacement support device. A support device replacement method characterized in that the support device is supported by a 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 placement on a support structure below the sole plate, a support body attached on the pedestal, and It is provided with a filling material for inserting into a filling material filling space portion formed between the upper surface of the upper collar of the support body and the lower surface of the sole plate, and the pedestal is further provided with a jack insertion portion below the pedestal top plate. And a support device for replacement, wherein the pedestal itself can be jacked up by a jack inserted into the jack insertion portion.   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.

Images