JP4755998B2 - Cutting and rehabilitating connecting bridges with different distances between buildings - Google Patents

Description

  The present invention relates to a method for cutting and repairing a connecting bridge in which the distance between buildings has changed due to uneven settlement or the like.

  For example, in an airport constructed on an artificial island by landfill, assuming that uneven settlement of the ground occurs, the building can be corrected by jacking up as seen in Patent Documents 1 and 2 etc. It has a structure. However, depending on the situation of uneven settlement of two buildings that are constructed at a distance from each other, even if the settlement of the building is corrected by jacking up the building, the distance between the buildings is shortened or conversely increased. Sometimes.

  Therefore, an expansion joint is provided on one end side of such a connecting bridge constructed between buildings. If the change in the distance between the buildings exceeds the allowable clearance of the expansion joint, the connection bridge will be connected. Since it cannot maintain a sound state as a bridge, some kind of renovation work is required.

  The repair work can be done by cutting the bridge girder, pulling the separated bridge girder, reconnecting the cut surfaces, reducing the length of the connecting bridge, or conversely pulling the separated bridge girder apart. A method of cutting and refurbishing a connecting bridge in which a bridge girder member is added between the cut surfaces to increase the length of the connecting bridge can be considered.

  This method of cutting and refurbishing the connecting bridge is extremely advantageous in terms of construction period and construction cost, compared to the case of replacing the entire connecting bridge. However, in the method of cutting and refurbishing connecting bridges, safety must be considered in the event of an earthquake with the bridge beam girder cut. Further, when pulling or separating the cut bridge girder, it is necessary to draw or separate the cut surfaces so that they do not deviate from each other in the vertical direction or the horizontal direction.

Japanese Patent Application Laid-Open No. 07-324347 JP 2005-146585 A

  The present invention has been made in consideration of the above points, and an object of the present invention is to provide a method for cutting and repairing a connecting bridge that can ensure safety even if an earthquake occurs during construction. .

  The technical means taken by the present invention in order to achieve the above object are as follows. In other words, the invention according to claim 1 cuts the connecting bridge erected between the buildings, moves the cut connecting bridge in the length direction, and then reconnects it to increase the length of the connecting bridge. A method of cutting and rehabilitating a connecting bridge to be corrected, and a process from cutting to reconnection while supporting the vicinity of the planned cutting position of the connecting bridge so that it can maintain substantially the same strength as before cutting even in a disconnected state. It is characterized by performing.

  The invention according to claim 2 is a method for cutting and refurbishing a connecting bridge in which the distance between buildings according to claim 1 is changed, near the planned cutting position and before the end of reconnection, Provide a support device for preventing the vertical and horizontal shifts between the cutting sites, and when cutting, moving the disconnected connecting bridge, and reconnecting, It is characterized by preventing horizontal displacement.

  In the first and second aspects of the invention, the connecting bridge may be any of a steel structure, a steel reinforced concrete structure, and a reinforced concrete structure.

  Each of the inventions according to claims 3 and 4 is directed to a steel-framed reinforced concrete connecting bridge, and the invention according to claim 3 includes a plurality of girder steel beams for bridge girder constructed between buildings, Cut the connecting bridge with the concrete floor for the passage supported by these girder steel frames, move the cut connecting bridge in the length direction, and then reconnect it to shorten the length of the connecting bridge In this method, the concrete floor at the planned cutting position is suspended in a state where the concrete floor at the center in the width direction of the passage is left, and the upper flange of the large beam steel frame is exposed. A steady rest is attached between the upper flanges located on both sides of the planned cutting position of the steel plate, and both sides of the planned cutting position of each girder steel frame are supported via a temporary jack on a temporary support base installed below the connecting bridge. Let In this state, the girder steel frame is cut and removed over a predetermined width, while a guide plate is attached between the webs of the girder steel frame located on both sides of the cutting position, and the girder steel frames located on both sides of the cutting position are used for holding a lateral force. In the state where it is connected with a horizontal jack, the center part side concrete floor that has been left is removed, after unloading the horizontal jack, the horizontal jack is refilled, and the cut large beam steel frames are drawn together, After the guide plate is removed, the large beam steel webs located on both sides of the cutting position are bolted together via the splice plate, the horizontal jack is removed, and the upper and lower flanges of the large beam steel frames located on both sides of the cutting position are removed. After welding, remove the steady rest, and then perform reinforcement and concrete placement to restore the cut section of the concrete floor. It is a symptom.

  The invention according to claim 4 cuts and cuts a connecting bridge including a plurality of bridge girder steel beams installed between buildings and a concrete floor for a passage supported by these girder steel frames. The connecting bridge is cut and repaired by moving the connecting bridge in the length direction and then reconnecting it to extend the length of the connecting bridge. In the state where the concrete floor is left behind, the upper flanges of the steel beams are exposed, and a steady rest is attached between the upper flanges located on both sides of the planned cutting positions of the steel beams. Both sides of the planned cutting position are supported by a temporary receiving frame installed under the connecting bridge via a temporary jack, and in this state the large beam steel frame is cut, while between the large beam steel webs located on both sides of the cutting position. Watt After attaching the guide plate and connecting the large beam steel frames located on both sides of the cutting position with a horizontal jack for separation, the left-side central floor concrete floor is removed, and after unloading the horizontal jack, After changing the horizontal jacks, the separated large beam steel frames are pulled apart, and after inserting the large beam material for the T-shaped cross section between the separated large beam steel frames, the guide plate is removed, After connecting the web of the extra beam material and the web of the big beam steel frame located on both sides of the web via the splice plate, the horizontal jack is removed, and the upper flange of the extra beam material for the extra beam and the large beam steel frame located on both sides thereof are removed. And welding the lower flange welded to the lower end of the web of the extension beam material and the lower flanges of the large beam steel frame located on both sides thereof, Re and removing the stopper, and thereafter, reinforcement, performs concreting, is characterized by performing the recovery of the cleavage site of the concrete floor.

  According to the first aspect of the present invention, the steps from cutting to reconnection are performed while supporting the vicinity of the planned cutting position so that substantially the same strength as before cutting can be maintained even in the cut state. Even if an earthquake occurs during construction, safety can be ensured.

According to the second aspect of the present invention, the support device is provided near the scheduled cutting position to prevent the vertical and horizontal shifts between the cutting parts from before the cutting until the end of the reconnection. Therefore, when pulling or pulling the disconnected bridge, it can be pulled or separated so that the cut surfaces do not deviate vertically or horizontally from each other. It can be performed easily and with high accuracy.

  According to the method for cutting and refurbishing a connecting bridge according to the invention described in claim 3, the distance between the buildings is shortened due to unsettled settlement or the like, and it is necessary to shorten the length of the connecting bridge constructed between the buildings. In this case, according to the cutting and refurbishing method of the connecting bridge according to the invention described in claim 4, the distance between the buildings becomes long due to the unsettled settlement or the like, and the length of the connecting bridge built between the buildings is extended. If necessary, install a temporary steady rest, guide plate, horizontal jack, etc. when cutting the girder steel beams for bridge girders or the concrete floor for passages, and against horizontal forces within the assumed earthquake range. The construction can be carried out in a state of being always connected, and there is an effect that safety can be secured even if an earthquake occurs during the construction.

  That is, according to the method for cutting and refurbishing a connecting bridge according to the invention described in claim 3, both sides of the planned cutting position of the bridge beam girder steel frame are supported via a temporary receiving jack on a temporary receiving base installed below the connecting bridge. As well as letting the braids cut across the upper flanges located on both sides of the planned cutting position in each girder steel frame, and in addition to cutting the girder steel frame with the concrete floor in the width direction center side left, Even if the girder steel frame is cut and removed over a predetermined width, the connecting bridge is connected in the horizontal direction by the center side concrete floor and the steady rest. Further, the level of the vertical displacement of the cut large beam steel frame can be adjusted with a temporary jack.

  Before the center-side concrete floor is lifted, a guide plate is attached between the webs of the large beam steel frames positioned on both sides of the cutting position, and the large beam steel frames positioned on both sides of the cutting position are used for holding the lateral force. Since it is connected with a horizontal jack, even if the concrete floor on the center side is removed, the connecting bridge will be connected with the steady rest and the guide plate with the horizontal jack, and due to elastic recovery from the deformed state before cutting Lateral force can be received by a horizontal jack, and the horizontal deviation (width direction) of the cut large beam steel frame can be prevented by the steady rest and the guide plate.

  After unloading the horizontal jacks, the horizontal jacks are rearranged in the direction used for pulling the cut large beam steels together, and the large beam steels in a state connected by the steady rest and the guide plate are drawn together. After removing the guide plate, after connecting the webs of the large beam steel frames located on both sides of the cutting position with bolts via the splice plate, the horizontal jack is removed, and the upper and lower flanges of the large beam steel frames located on both sides of the cutting position Since the steady rest is removed after welding, the construction is always carried out in a connected state. Therefore, even if an earthquake occurs during construction, safety can be ensured, and when drawing the cut steel beams, the cut surfaces can be drawn so that they do not deviate in the vertical or horizontal direction. The reconnection of the cutting part can be performed easily and with high accuracy.

  According to the method for cutting and refurbishing a connecting bridge according to the second aspect of the present invention, only the both sides of the planned cutting position of the bridge beam girder steel frame are supported by the temporary receiving frame installed below the connecting bridge via the temporary receiving jack. Rather than attaching a steady rest between the upper flanges located on both sides of the planned cutting position of each girder steel frame, and cutting the girder steel frame with the concrete floor in the width direction center side left, the girder steel frame is cut. Even if is cut, the connecting bridge is connected in the horizontal direction by the center side concrete floor and the steady rest. Further, the level of the vertical displacement of the cut large beam steel frame can be adjusted with a temporary jack.

Then, before removing the central concrete floor, a guide plate is attached to the web of the large beam steel frame located on both sides of the cutting position, and the large beam steel frames located on both sides of the cutting position are separated with a horizontal jack for separating them. Because it is connected, the connecting bridge is connected to the steady rest and the guide plate with a horizontal jack even if the concrete floor on the center side is removed, and the tensile force due to elastic recovery from the deformed state before cutting is obtained. The horizontal jack can be received by the horizontal jack, and the horizontal deviation (width direction) of the cut large beam steel frame can be prevented by the steady rest and the guide plate.

  After unloading the horizontal jacks, the horizontal jacks are rearranged in the direction used to separate the cut large beam steel frames, and the large beam steel frames that are connected by the steady rest and the guide plate are separated from each other. After inserting the extension beam material with T-shaped cross section between the separated beam beams, remove the guide plate, and connect the extension beam material web and the beam beam beams on both sides to the splice plate. After the bolts are connected, the horizontal jack is removed, and the upper flange of the extension beam is welded to the upper flange of the upper beam steel frame located on both sides of the upper beam, and the lower beam is welded to the lower end of the extension beam. After welding the flange and the lower flange of the large beam steel frame located on both sides of the flange, the steady rest is removed, so that the construction is always performed in a connected state. Therefore, safety can be ensured even if an earthquake occurs during the construction, and when the cut steel beams are pulled apart, they can be separated so that the cut surfaces do not deviate in the vertical and horizontal directions. The reconnection of the cutting part can be performed easily and with high accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows a connecting bridge constructed between two buildings B and C constructed on an artificial island by landfill. Due to the unsettled settlement, the position of the building B is shifted to the building C side, and the distance between the buildings B and C is shortened. As a result, the middle column D supporting the intermediate part of the connecting bridge A is moved to the building C side. Slightly inclined. P indicates a scheduled cutting position.

  The connecting bridge A is an SRC structure, and as shown in FIGS. 2 (A) and 2 (B), two bridge girder steel frames 1 constructed between the buildings B and C, and these girder steel frames 1 A passage concrete floor 3 supported via a small beam steel frame 2 and a roof 5 supported by a column 4 standing on the large beam steel frame 1 are provided. Further, on both sides of the concrete floor 3 for the passage, there are provided concrete grooves 6 that cantilevered outwardly from the steel beam 1, and a moving walk (moving sidewalk) 7 is installed in each concrete groove 6. Has been. 8 is a handrail.

  The above-mentioned connecting bridge A is cut and removed by a predetermined width at the position P, and the cut bridge girder steel frame 1 is drawn and reconnected to cut the length of the connecting bridge A. In order to maintain substantially the same strength as before cutting, the connection bridge A includes a temporary jack 16, a steady rest 14, a guide plate 18, a horizontal jack 19, and the like, which are described later, near the planned cutting position P. A cutting and repairing method is employed in which steps from cutting to reconnection are performed while being supported by a support device. Below, the cutting and repairing method will be specifically described.

  First, as shown in FIGS. 2A and 2B, the finishing material of the concrete floor 3 and the moving walk 7 are removed, and an eaves panel 9 is required using an aerial work vehicle (not shown). Remove only the range.

  Next, as shown in FIGS. 3A and 3B, a reinforcing small beam steel frame 2a is newly provided between the large beam steel frames 1 near the planned cutting position P. Reference numeral 10 denotes a gusset plate for attaching the small beam steel frame 2a, and 11 denotes an electric chain block for lifting and temporarily supporting the small beam steel frame 2a carried on the aerial work vehicle. It is assumed that a through-hole for inserting a hanging metal fitting by an electric chain block is made at a certain point. A frame scaffold 12 supports the electric chain block 11.

Next, as shown in FIGS. 4 (A) and 4 (B), after installing the temporary receiving gantry E below the connecting bridge A, as shown in FIGS. 5 (A) and 5 (B), While assembling the frame scaffolding F around,
The roof and wall finishing material above the planned cutting position P are removed, and the roof steel frame above the planned cutting position P is cut. G is a jump beam support work.

  Thereafter, as shown in FIGS. 6 (A) and 6 (B), the concrete floor 3 and the concrete groove 6 just above the small beam steel frame 1 including the scheduled cutting position P are suspended, and the upper flange and The web is exposed and the concrete floor 3a in the width direction center side of the passage is left without being left. In this state, the bolt holes are formed in the web of each steel beam steel frame 1 and the horizontal jack bracket 13 is attached, and the steady rests 14 are attached to the upper flanges located on both sides of the planned cutting position P in each steel beam steel frame 1. Further, a moving walk floor receiving beam (beam steel frame that supports the restored concrete groove) 15 is attached to the large beam steel frame 1, and four temporary receiving jacks 16 are installed on the temporary receiving frame E, and each large beam steel frame is installed. 1 is supported on both sides of the scheduled cutting position P. A sliding material 16a such as Teflon (registered trademark) or nylon is interposed between the upper portion of the temporary jack 16 and the lower flange 1c of the steel beam 1.

  As shown in FIGS. 11 and 12, the steady rest 14 is welded with a first horizontal steel plate 14a on the outer side of the upper flange 1a located on one side of the planned cutting position P, and on the opposite side of the planned cutting position P. A second horizontal steel plate 14b that reaches the position overlapping the first horizontal steel plate 14a beyond the planned cutting position P is welded to the outer portion of the upper flange 1a that is positioned, and the horizontal steel plates 14a and 14b are within a certain range. It is constructed by bolts slidably only in the longitudinal direction of the bridge girder. Although the circular bolt hole is formed in the 1st horizontal steel plate 14a, the long hole 17 of the length corresponding to the cutting width of the girder steel frame 1 is formed in the 2nd horizontal steel plate 14b. Although not shown, sliding materials such as Teflon (registered trademark) and nylon are interposed between the horizontal steel plates 14a and 14b and between the second horizontal steel plate 14b and the washer of the nut, respectively.

  Thereafter, as shown in FIGS. 7A and 7B, the girder steel frame 1 is restored to a predetermined width (this restores the middle column D to a vertical posture while leaving the concrete floor 3a in the width direction center side of the passage. The guide plate 18 is cut using a web connection bolt hole on both sides of the web 1b of the large beam steel frame 1 located on both sides of the cutting position. A horizontal jack 19 for holding a lateral force is attached between the horizontal jack brackets 13 located on both sides of the attachment and cutting positions.

  As shown in FIGS. 13 to 16, the horizontal jack 19 is a center hole jack having a shaft portion penetrating a screw shaft 19a. 19b is a joint coupler for the screw shaft 19a. The horizontal jack bracket 13 is formed with a notch for inserting the screw shaft 19a, and the gusset plate 10 is formed with through holes 10a for inserting the joint coupler 19b at two upper and lower positions.

  As shown in FIGS. 11 and 12, the guide plate 18 is composed of a pair of groove steels that slidably hold both surfaces of the web 1b only in the longitudinal direction of the bridge beam, and is located on one side of the cutting position of each groove steel. A circular bolt hole is formed in a portion connected to the web 1b and the bolt, and a long hole 20 having a length corresponding to the excision width of the girder steel frame 1 is formed in a portion connected to the web 1b located on the opposite side of the cutting position. Is formed. Although not shown, sliding materials such as Teflon (registered trademark) and nylon are interposed between the washer and the grooved steel and between the grooved steel and the web 1b.

As shown in FIGS. 8 (A), (B), and FIG. 13, the central portion left in the state where the large beam steel frames 1 located on both sides of the cutting position are connected to each other by a horizontal jack 19 for holding a lateral force. Scrape the side concrete floor 3a. By eliminating the central concrete floor 3a, as shown in FIG. 14, the cut large beam steel frame 1 is elastically restored from a deformed state before cutting by a small distance (for example, about 50 mm). Lateral force due to elastic recovery from the horizontal jack 19 is received.

  Next, after unloading the horizontal jack 19, as shown in FIGS. 9 (A), (B) and FIG. 15, the horizontal jack 19 is changed to the direction used for pulling the crossed large beam steel frames 1, By operating the horizontal jack 19 to extend, the cut large beam steel frames 1 are drawn together.

  Then, as shown in FIGS. 10A, 10B, and 16, after the guide plate 18 is removed, the webs 1b of the large beam steel frames 1 positioned on both sides of the cutting position are bolted together via the splice plate 21. At the same time, the horizontal jack 19 is removed, and after the upper and lower flanges 1a, 1c are welded on the large beam steel frame 1 located on both sides of the cutting position, the steady rest 14 is removed.

  Thereafter, the temporary jack 16 is removed, and, as shown in FIG. 17, a bar arrangement (not shown) in the range where it is picked up, concrete 3b is placed, and the concrete floor 3 and the concrete groove are cut. After the restoration and roof / wall restoration, the frame scaffold F will be dismantled, the temporary receiving base E will be dismantled, the equipment such as the moving walk 7 will be restored, and the eaves panel 9 will be restored. .

  According to the above configuration, when the distance between the buildings B and C is shortened due to uneven settlement, etc., and it becomes necessary to shorten the length of the connecting bridge A erected between the buildings B and C, the bridge girder is used. When cutting the girder steel frame 1 or the concrete floor 3 for the passage, the temporary steady rest 14, the guide plate 18, the horizontal jack 19, etc. are attached so that they are always connected to the horizontal force within the assumed earthquake range. It is possible to proceed with the construction and secure safety even if an earthquake occurs during the construction.

  In other words, not only the both sides of the planned cutting position P in the bridge girder steel beam 1 are supported by the temporary receiving base E installed below the connecting bridge A via the temporary receiving jacks 16 but also the planned cutting positions in the respective large beam steel frames 1. Since the steady rest 14 is attached between the upper flanges 1a, 1a located on both sides of the P, and the concrete beam 3a in the width direction of the passage is left, the large beam steel frame 1 is cut. Even if it is cut and removed over the width, the connecting bridge A is connected in the horizontal direction by the center side concrete floor 3a and the steady rest 14. Further, the level of the vertical displacement of the cut large beam steel frame 1 can be adjusted by the provisional jack 15.

  And before picking up the said center side concrete floor 3a, the guide plate 18 is attached over the web 1b of the large beam steel frame 1 located in the both sides of a cutting position, and the large beam steel frames 1 located in the both sides of a cutting position are attached. Since the horizontal jacks 19 for holding the lateral force are connected, the connecting bridge A is connected to the steady rest 14, the guide plate 18, and the horizontal jacks 19 even if the central concrete floor 3 a is removed. Lateral force due to elastic recovery from the deformed state before cutting can be received by the horizontal jack 19, and horizontal deviation (width direction) of the cut large beam steel frame 1 is prevented by the steady rest 14 and the guide plate 18. be able to.

  After unloading the horizontal jacks 19, the horizontal jacks 19 are rearranged in the direction used to draw the cut large beam steels 1, and the large beam steels 1 in a state where they are connected by the steady rest 14 and the guide plate 18. After the guide plate 18 is removed, the webs 1b of the large beam steel frames 1 located on both sides of the cutting position are bolted together via a pair of splice plates 21, and then the horizontal jack 19 is removed and cut. Since the steady rest 14 is removed after welding the upper and lower flanges 1a and 1c of the large beam steel frame 1 located on both sides of the position, the construction is always continued in a connected state.

  Therefore, even if an earthquake occurs during construction, safety can be ensured, and when the cut beam 1 is drawn, the cut surfaces can be drawn so that they do not deviate in the vertical and horizontal directions. It is possible to reconnect the cutting part easily and with high accuracy.

  In the above embodiment, the present invention has been described by taking as an example the case where the distance between the buildings B and C is shortened due to the unsettled settlement. However, the present invention, contrary to the above, the building B due to the unsettled settlement. , C becomes longer, and the connection bridge A erected between the buildings B and C needs to be extended in length.

  The following shows an embodiment in that case. In addition, since the construction procedure to FIG. 2 (A), (B)-FIG. 6 (A), (B) is the same as the construction procedure when the distance between the buildings B and C becomes short, it is illustrated. Description is omitted. Also, as shown in FIGS. 18 to 22, the steady rest 14 and the guide plate 18 used in this embodiment have substantially the same configuration as the steady rest 14 and the guide plate 18 shown in FIGS. However, in the example of FIGS. 11 to 15, it is intended to enable the movement of the large beam steel frames 1 when drawing the large beam steel frames 1 from which the long holes 17 and 20 are cut, whereas FIGS. The example of 22 is different only in that it is intended to enable movement of the girder steel frames 1 when the girder steel frames 1 having the long holes 17 and 20 cut are separated.

  After the steps of FIGS. 6 (A) and 6 (B), as shown in FIG. 20, the large beam steel frame 1 is cut at the planned cutting position P while leaving the widthwise central portion side concrete floor 3a. Guide plates 18 are attached to both sides of the web 1b of the large beam steel frame 1 located on both sides of the position using web connecting bolt holes, and the horizontal jacks for pulling apart are disposed between the horizontal jack brackets 13 located on both sides of the cutting position. (Center hole jack) 19 is attached. Specifically, the horizontal jack 19 is attached to the bracket 13 on one side of the cutting position, and one end portion of the screw shaft that passes through the shaft core of the horizontal jack 19 is fixed to the bracket 13 on the opposite side of the cutting position. A horizontal jack 19 is installed so as to prevent the girder steel frames 1 from moving in a direction away from each other.

  Thereafter, as shown in FIG. 21, the central concrete side floor 3a that has been left is suspended while the large beam steel frames 1 located on both sides of the cutting position are connected to each other by a horizontal jack 19 for separation. Since the center-side concrete floor 3a is eliminated, the cut large beam steel frame 1 is elastically restored from a deformed state before cutting by a short distance (for example, about 50 mm). Therefore, a tensile force due to elastic restoration from the deformed state before cutting. Can be received by the horizontal jack 19, and the horizontal displacement (width direction) of the cut large beam steel frame 1 can be prevented by the steady rest 14 and the guide plate 18.

  Next, after the unloading of the horizontal jack 19, as shown in FIG. 22, the horizontal jack 19 is changed in the direction used for pulling the cut-off large steel frames 1, and the horizontal jack 19 is extended to perform the cutting operation. The separated large beam steel frames 1 are separated. Then, after inserting the extension beam material 1A having a T-shaped cross section between the separated steel beam steel frames 1, the guide plate 18 is removed.

  In this state, as shown in FIG. 23, the web 1Ab of the extension beam 1A and the web 1b of the beam 1 positioned on both sides of the web 1b are bolted together via two pairs of splice plates 21, and then the horizontal jack 19 is removed, and the upper flange 1Aa of the extension beam 1A and the upper flange 1a of the upper beam 1 positioned on both sides thereof are welded, and the lower flange is welded in situ to the lower end of the web 1Ab of the extension beam 1A. After welding 1Ac and the lower flange 1c of the girder steel frame 1 located on both sides thereof, the steady rest 14 is removed.

After that, the temporary jack 16 is removed, and as shown in FIG. 24, the arrangement of the barbed area (not shown) and the concrete 3b are placed, and the concrete floor 3 and the concrete groove are cut. After the restoration and roof / wall restoration, the frame scaffold F will be dismantled, the temporary receiving base E will be dismantled, the equipment such as the moving walk 7 will be restored, and the eaves panel 9 will be restored. .

  According to the above configuration, when the distance between the buildings B and C becomes long due to uneven settlement, etc., and it becomes necessary to extend the length of the connecting bridge A erected between the buildings B and C, the bridge girder is used. When cutting the girder steel frame 1 or the concrete floor 3 for the passage, the temporary steady rest 14, the guide plate 18, the horizontal jack 19, etc. are attached so that they are always connected to the horizontal force within the assumed earthquake range. It is possible to proceed with the construction and secure safety even if an earthquake occurs during the construction.

  In other words, not only the both sides of the planned cutting position P in the bridge girder steel beam 1 are supported by the temporary receiving base E installed below the connecting bridge A via the temporary receiving jacks 16 but also the planned cutting positions in the respective large beam steel frames 1. The brace 14 is cut between the upper flanges 1a, 1a located on both sides of the steel plate, and the steel beam 1 is cut with the concrete floor 3a in the width direction of the passage remaining, so that the steel beam 1 is cut. However, the connecting bridge A is connected in the horizontal direction by the center side concrete floor 3a and the steady rest 14. Further, the level of the vertical displacement of the cut large beam steel frame 1 can be adjusted by the provisional jack 15.

  And before picking up the said center side concrete floor 3a, the guide plate 18 is attached over the web 1b of the large beam steel frame 1 located in the both sides of a cutting position, and the large beam steel frames 1 located in the both sides of a cutting position are attached. Since it is connected by the horizontal jack 19 for separation, the connecting bridge A is connected by the steady rest 14, the guide plate 18, and the horizontal jack 19 even if the center side concrete floor 3 a is picked up. A tensile force due to elastic recovery from the previous deformation state can be received by the horizontal jack 19.

  After unloading the horizontal jacks 19, the horizontal jacks 19 are rearranged in the direction used to separate the cut large beam steels 1, and the large beam steels 1 connected by the steady rest 14 and the guide plate 18 are exchanged. After inserting the extension beam material 1A having a T-shaped cross section between the separated beam beams 1, the guide plate 18 is removed, and the web 1Ab of the extension beam material 1A is positioned on both sides thereof. After connecting the web 1b of the large beam steel frame 1 to the bolt 1 via the splice plate 21, the horizontal jack 19 is removed, and the upper flange 1Aa of the large beam material 1A for extension and the upper flange 1a of the large beam steel frame 1 positioned on both sides thereof Are welded to the lower flange 1Ac welded to the lower end of the web 1Ab of the extension beam material 1A and the lower flange 1c of the steel beam frame 1 positioned on both sides thereof. After you, because it removed the bracing 14, always will be construction work on a consolidated state is advanced.

  Therefore, safety can be ensured even if an earthquake occurs during construction, and when the cut steel beam 1 is separated, the cut surfaces can be separated so that they do not deviate in the vertical and horizontal directions. It is possible to reconnect the cutting part easily and with high accuracy.

  As mentioned above, although embodiment of this invention was described, this invention is not limited only to said embodiment, For example, the range which does not deviate from the summary of this invention, such as making RC connection bridge into construction object Of course, the present invention can be implemented in various modes.

It is a schematic side view of a connecting bridge showing an embodiment of the present invention. The construction procedure of the cutting and repairing method of the connecting bridge according to the present invention is shown, (A) is a longitudinal front view, (B) is a longitudinal side view. The construction procedure following FIG. 2 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 3 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 4 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 5 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 6 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 7 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 8 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. The construction procedure following FIG. 9 is shown, (A) is a longitudinal front view, and (B) is a longitudinal side view. It is a top view of the principal part explaining the structure of a steady rest and a guide plate. It is a vertical front view of the principal part explaining the structure of a steady rest and a guide plate. It is a side view of the principal part just before picking up a center part side concrete floor. It is a side view of the principal part just after suspending of the center part side concrete floor. It is a side view of the principal part in the state which performed horizontal drawing. It is a side view of the principal part in the state which carried out the bolt connection of the web of the drawn large beam steel frame. It is a side view of the principal part in the state which completed reconnection. It is a top view of the principal part which shows other embodiment of this invention and demonstrates the structure of a steady rest and a guide plate. It is a vertical front view of the principal part explaining the structure of a steady rest and a guide plate. It is a side view of the principal part just before picking up a center part side concrete floor. It is a side view of the principal part in the state which performed horizontal separation. It is a side view of the principal part in the state which inserts the large beam material for extension between the separated large beam steel frames. It is a side view of the principal part in the state which carried out the bolt connection and the welded large beam steel material and the large beam material for an extension. It is a side view of the principal part in the state which completed reconnection.

Explanation of symbols

A Connecting bridge B, C Building E Temporary receiving frame 1 Large beam steel frame for bridge girder 3 Concrete floor 3a Center side concrete floor 14 Stabilization 16 Temporary receiving jack 18 Guide plate 19 Horizontal jack (center hole jack)

Claims (4)

  A method of cutting and refurbishing a connecting bridge that corrects the length of the connecting bridge by cutting the connecting bridge erected between the buildings, moving the disconnected connecting bridge in the length direction, and then reconnecting it. In order to maintain approximately the same strength as before cutting even in a disconnected state, the steps from cutting to reconnection are performed while supporting the vicinity of the planned cutting position of the connecting bridge. How to cut and repair a connecting bridge whose distance has changed.   A method of cutting and refurbishing a connecting bridge that corrects the length of the connecting bridge by cutting the connecting bridge erected between the buildings, moving the disconnected connecting bridge in the length direction, and then reconnecting it. In the vicinity of the planned cutting position, a support device is provided to prevent vertical and horizontal shifts between the cutting sites from before cutting until the end of reconnection. The connecting bridge according to claim 1, wherein the distance between buildings can be prevented from shifting in a vertical direction and a horizontal direction between cutting parts in both cases of movement and reconnection. Cutting repair method.   Cut the connecting bridge with multiple girder steel beams for bridge girders erected between the buildings and the concrete floor for the passage supported by these girder steel frames, and move the cut connecting bridge in the length direction And then reconnecting to shorten the length of the connecting bridge. The connecting bridge is cut and refurbished, and the concrete floor at the planned cutting position is suspended in the state where the concrete floor on the center side in the width direction of the passage is left. The upper flanges of the steel beams are exposed, the steady rests are attached between the upper flanges located on both sides of the planned cutting positions in each steel beam, and both sides of the planned cutting positions in each steel beam are connected to the bridge In this state, the girder steel frame is cut and removed over a predetermined width, while the girder steel frame is positioned between the webs of the girder steel frames located on both sides of the cutting position. In the state where large beam steel frames located on both sides of the cutting position are connected to each other with a horizontal jack for holding lateral force, the center side concrete floor is suspended, and after unloading the horizontal jack, the horizontal jack After the guide plate is removed, the webs of the large beam steel frames located on both sides of the cutting position are bolted together via the splice plate and the horizontal jack is pulled. After welding the upper and lower flanges of the girder steel frames located on both sides of the cutting position, remove the steady rest, and then perform reinforcement and concrete placement to restore the cut section of the concrete floor. A cutting and repairing method for connecting bridges with different distances between buildings. Cut the connecting bridge with multiple girder steel beams for bridge girders erected between the buildings and the concrete floor for the passage supported by these girder steel frames, and move the cut connecting bridge in the length direction And then reconnecting and extending the length of the connecting bridge. The connecting bridge is cut and refurbished, and the concrete floor at the planned cutting position is suspended in the state where the concrete floor at the center in the width direction of the passage is left. The upper flanges of the steel beams are exposed, the steady rests are attached between the upper flanges located on both sides of the planned cutting positions in each steel beam, and both sides of the planned cutting positions in each steel beam are connected to the bridge Is supported by a temporary support jack installed underneath, and in this state the large beam steel frame is cut, while the guide plates are mounted between the large beam steel webs located on both sides of the cutting position. In the state where the large beam steel frames located on both sides of the cutting position are connected with a horizontal jack for separating, the center side concrete floor is suspended, and after unloading the horizontal jack, the horizontal jack is refilled. After separating the beamed steel beams, insert a beam for extension with a T-shaped cross section between the separated beam beams, remove the guide plate, and the web of the beam for extension beam and its After bolting the web of steel beams on both sides via splice plates, remove the horizontal jack and weld the upper flange of the extension beam and the upper flanges of the beam on both sides After welding the lower flange welded to the lower end of the web of the extension beam and the lower flanges of the large beam steel frame located on both sides of the lower beam, the steady rest is removed, and then the reinforcement, Performing cleat striking setting, cutting repair method of connecting bridge the distance between buildings has changed, characterized by performing the recovery of the cleavage site of the concrete floor.

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