JPS6366963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of a bearing device used in the extrusion construction method of bridges, and its purpose is to improve the upper foot of the bearing device and This invention relates to a support device for an erection method that restricts the tilting of a movable member.

Conventionally, in the extrusion construction method of a bridge using a bearing device, as shown in Fig. 1, a bridge girder G is loaded onto a bearing device S arranged on a pier B, and the bearing device S is pushed a certain distance by an extrusion device E. As a result, the bridge girder G is pushed out, and in this state, the bridge girder G is lifted up with a vertical jack F, the support device S is returned to its original position, and the operation of loading the bridge girder G onto the support device S again and pushing it out is repeated. As shown in FIG. , and construction methods in which the bridge girder G is pulled (or pushed) by an extrusion device E so that it slides on the support device S together with the movable member T, and is successively extruded and constructed.

The present invention aims to improve the problems of the supporting devices conventionally used in the construction method.

That is, in this construction method, if the bridge girder G pushed out in the bridge axis direction moves (displaces) in the direction perpendicular to the bridge axis during extrusion, an unbalanced load acts on the support device S that supports the bridge girder G, and the support device The upper shoe of S and the movable member tilt, and due to this tilting, the bridge girder G
Since there is a concern that the bridge girder G may be damaged due to bending, there remains the problem that movement in that direction must be regulated and adjusted by frequently performing complicated operations.

To be more specific, the bridge girders used in the extrusion construction method are made of prestressed concrete and have a box-shaped cross section, as shown in Figure 3.
The parts to which are attached are the lower slab I and the upper slab J.
The hollow part K between the spans is also filled with concrete and manufactured with increased strength to sufficiently withstand the concentrated load after construction and during extrusion construction, but other parts, that is, the parts located between the spans (between the piers) , because it is formed into a box shape with a hollow part K in consideration of manufacturing and economic efficiency, the lower slab I of the bridge girder G is structurally difficult to withstand the concentrated load during extrusion construction.
The support point of this part during extrusion erection is limited to the web H of the bridge girder G.

Therefore, in the extrusion construction method of the bridge girder G, as shown in FIG. A temporary support member A supporting the web H and/or a movable member T are arranged on the upper shoe C with their centers eccentrically located on the side edge side from the center of the support device S, and the bridge girder G is placed on the side of the support device S. A structure is adopted in which support is provided at the edges. However, in this configuration, the bridge girder G
No problem will occur if the bridge is pushed out normally on the support device S that supports it at the side edge, in other words, if it maintains equilibrium on the support device S and is pushed straight in the direction of the bridge axis, but as shown in Figure 5. In order to support the bridge girder G at the side edge, the movable member D of the supporting device S may have an imbalance of pulling force (or pushing force) in the extrusion device that pulls out (or pushes out) the bridge girder G.
When the bridge girder G moves (displaces) in either direction perpendicular to the bridge axis due to the slight tilting of the upper shoe C between the upper shoe C and the upper shoe C, and supports the vicinity of the lower slab I of the bridge girder G, the bridge girder G moves. The load of the bridge girder G on the bearing device S in the direction increases from the normal state in which the bearing device S supports the bridge girder G in equilibrium at a position eccentric from its center [arrow A in the figure], and the load on the bearing device S increases. Since it acts as an uneven load, the movable member D tilts in the direction of arrow B in the figure with the lower shoe L as a fulcrum together with the upper shoe C and temporary support member A, and due to this tilting, the lower slab I of the bridge girder G Bending force due to its own weight acts, and there is a concern that this force may damage the lower slab I of the bridge girder G, which is not considered for localized concentrated loads.

Therefore, there remains the problem that movement of the bridge girder G in the direction perpendicular to the bridge axis must be regulated and adjusted by frequently performing complicated operations.

In this case, since the load on the bridge girder G is reduced in one of the opposing supporting devices S, phenomena such as inclination are less likely to occur.

In view of the foregoing, the present invention has been developed by connecting temporary support members disposed on a support device and supporting the web of a bridge girder to each other in a direction perpendicular to the bridge axis using support members to make it rigid. To obtain a support device for an extrusion construction method for a bridge, which restricts tilting of movable members and upper shoes that would damage the bridge girder even if the bridge girder moves in a direction perpendicular to the bridge axis.

That is, on the support device fixed on the pier,
A bearing used in a bridge extrusion construction method in which a bridge girder with a sole plate fixed to the lower surface is placed, and the support device is sequentially extruded, and the sole plate of the bridge girder and the upper shoe of the support device are connected and fixed at the erection position. In the device, the support device is composed of an upper shoe, a lower shoe, and a movable member disposed between the upper and lower shoes, and the support device is mounted on the pier so as to face each other in a direction perpendicular to the bridge axis across the bridge axis center line. Temporary support members are fixed to the upper surface of the upper shoe of the support device, with their centers eccentrically positioned toward the side edges of the bridge girder from the center of the support device in order to support the web of the bridge girder. A support device for an extrusion construction method for a bridge, characterized in that the temporary support members are connected to each other by a support member in a direction perpendicular to the bridge axis in order to restrict tilting of the upper foot of the support device and the movable member. It provides:

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Note that this embodiment will be explained using an example applied to an erection method in which a temporary support member and a moving member are arranged on a support device.

In addition, since the bearing devices placed on the bridge piers are placed symmetrically across the bridge axis center line in the direction perpendicular to the bridge axis,
Only one is shown.

Reference numeral 1 denotes a support device arranged between the pier B and the bridge girder G, and the support device 1 is arranged on a lower shoe 2 fixed to the pier B and on the lower shoe 2 to eliminate displacement such as tilting and expansion and contraction of the bridge girder G. It consists of a movable member 3, an upper shoe 4 disposed on the movable member 3, a sole plate 5 fixed to the bridge girder G, and a connecting member 6 that connects the sole plate 5 and the upper shoe 4 after they are installed. 7 is a holding device disposed on the extrusion start point side in the bridge axis direction of the support device 1; 8 is a winding device disposed on the front side of the bridge axis direction extrusion of the support device 1 so as to face the holding device 7; 9 is a winding device disposed on the front side of the support device 1 in the bridge axis direction extrusion; Temporary support members 10 and 10 are disposed on the support device 1 during erection, and 10 is a support member that connects the temporary support members 9 to each other in the direction perpendicular to the bridge axis. 11 is a long movable member made of a thin steel plate, etc. The movable member 11 is wound in a roll or the like and is supported by the holding device 7 so as to be movable in the bridge axis direction on the temporary support member 9 of the support device 1, and after passing over the temporary support member 9, it is moved to a winding device. 8.

To be more specific, the lower shoe 2 has a recess 12 on the upper surface of which the bearing plate constituting the movable member 3 slides.
Convex portions 13, 13 are formed to sandwich the concave portion 12 in a direction perpendicular to the bridge axis, and are fixed to the pier B by anchor bolts 14, 14, etc.

The upper shoe 4 has a concave portion 16 extending in the direction perpendicular to the bridge axis on its upper surface 15, locking holes 17 for engaging with the sole plate 5 at both ends in the direction of the bridge axis, and a lower part at both ends in the direction perpendicular to the bridge axis. Step portions 19, 19 are formed having notches 18, 18 that engage with the convex portions 13, 13 of the shoe.

In addition, the notches 18, 18 are designed to have a size equal to the width of the protrusions 13, 13 of the lower shoe plus the above-mentioned expansion/contraction allowance and assembly allowance in the support device 1 which releases expansion/contraction and tilting of the bridge girder G after construction. In addition, the support device 1 which restricts expansion and contraction and releases only inclination is formed to a size that includes an assembly allowance.

The sole plate 5 has a downward convex portion 21 in the center of its lower surface 20, screw holes 22, 22 around the downward concave portion 21 for fixing the connecting member 6, and screw holes 22, 22 for fixing the connecting member 6 at both ends in the bridge axis direction. Bolt holes 23, 23 are formed to match the holes 17, 17.

The sole plate 5 is buried and fixed in advance at the time of manufacturing the bridge girder G in a position that matches the support device 1 fixed to the pier B after erection, with its lower surface 20 flush with the lower surface of the bridge girder G. It is.

The connecting member 6 has a projection 25 in the center of its upper surface 24 that engages with the downward recess 21 of the sole plate, and bolt holes 23 of the sole plate and a locking hole 17 of the upper shoe at both ends in the bridge axis direction. , 17, and engagement holes 27, 27 are formed around the protrusion 25 to match the screw holes 22, 22 of the sole plate.

In addition, the connecting member 6 has a concave portion 29 on its lower surface 28 that matches the concave portion 16 of the upper shoe, and a side surface of the upper shoe 4 along the bridge axis direction at both ends thereof in the direction perpendicular to the bridge axis. Convex strips 30, 30 that fit into the lower surface 28 are formed to protrude from the lower surface 28.

The temporary support member 9 has a U-shaped cross section with legs 31, 31, and a recess 33 into which the sliding member 32 is fitted is provided on the surface facing away from the legs 31, 31. A connecting hole 34 is provided in one of the parts 31, 31.

The temporary support member 9 is attached to the upper shoe 4 of the support device arranged on the pier B so as to face each other in the direction perpendicular to the bridge axis.
The legs 31, 31 are fitted onto the side surface of the upper shoe 4 in the direction perpendicular to the bridge axis so that the connecting holes 34 sandwich the bridge axis and face each other in the direction perpendicular to the bridge axis, and The upper shoe 4 is secured with bolts or the like so that it does not move when the moving member 11 slides on the sliding member 32.
It is to be fixed to.

The support members 10, 10 are screwed into connecting holes 34 of opposing temporary support members to connect the temporary support members 9 to each other, and are made rigid by being tensioned by the adjustment member 35.

Reference numerals 36 and 36 designate side blocks that are fixed to the convex portions 13, 13 of the lower shoe with bolts or the like, and lock the step portions 19, 19 of the upper shoe in the vertical direction.

37, 37 are locking pieces arranged between the notches 18, 18 of the upper shoe and the protrusions 13, 13 of the lower shoe. It regulates movement.

8 and 9, reference numeral 38 denotes a locking member which, after being installed, is fitted into the concave strip 16 of the upper shoe and the concave strip 29 of the connecting member, thereby connecting the upper shoe 4 and the connecting member. 6 in the bridge axis direction. Note that the holding device 7 and the winding device 8 that support and wind up the moving member 11 have their respective base portions fixed to the pier B with bolts or the like.

Next, we will explain in detail the extrusion construction of bridge girders.

That is, the temporary support member 9 is placed on the upper foot 4 of the support device, which is disposed on the pier B so as to face each other across the bridge axis. 31, 31 are fitted into the upper shoe 4 and fixed with bolts, and the supporting member 10 is screwed into the connecting hole 34, thereby connecting the temporary receiving members 9 facing each other.

After that, a holding device 7 for supplying the movable member 11 and a winding device 8 for winding up the supplied movable member 11 are placed and fixed on the front and rear sides of the support device 1 in the bridge axis direction to prevent the temporary support member from sliding. Moving member 11 on member 32
Then, on the movable member 11, a bridge girder G manufactured on a manufacturing table provided behind the abutment and equipped with a hand-stretched garter is loaded.

Then, using a pushing device attached to either the pier B or the bridge girder G, the temporary support member 9 is pushed out together with the moving member 11 by sliding contact between the sliding member 32 of the temporary support member and the moving member 11. , and on the vacant production table, concrete is poured onto the bridge girder G that has been pushed forward, and is successively pushed out to the vicinity where the sole plate 5 fixed to the bridge girder G matches the predetermined support device 1.

Next, attach the connecting member 6 to the sole plate 5 at this position so that the convex strips 30, 30 of the connecting member fit into the side surface of the upper shoe 4 in the direction perpendicular to the bridge axis. The projections 25 provided on the upper surface are fitted, and the bolts arranged in the engagement holes 27, 27 are inserted into the screw holes 22, 22 of the sole plate.
Screw it on to secure it together.

Thereafter, the bolts fixing the temporary support member 9 to the upper shoe 4 are removed, and the movable member 11 supplied from the holding device 7 is cut off at the end of the upper shoe 4.
By pushing out the bridge girder G again with the extrusion device, the connecting member 6 fixed to the sole plate 5 presses the temporary support member 9 on the upper shoe 4 and moves the temporary support member 9 and the temporary support member 9. The member 11 is replaced with the connecting member 6.

Next, in this state, a locking member 38 is arranged between the grooved line 29 of the connecting member that matches the grooved line 16 of the upper shoe, and the locking holes 17, 17 of the upper shoe and the through holes 26, 26 of the connecting member are arranged. The bolts arranged in the upper shoe 4 are screwed into the bolt holes 23, 23 of the sole plate.
is fixed to the sole plate 5 via the connecting member 6.

Then, the locking pieces 37, 37 that restricted the movement of the upper shoe 4 in the bridge axis direction during construction, the pushing device, the holding device 7 that supplied the moving member 11, and the winding device 8 that took up the moving member 11 were installed. The construction will be completed by removing it.

With this configuration, even if the bridge girder G moves in the direction perpendicular to the bridge axis during extrusion construction of the bridge girder G, the tilting of the upper shoe 4 and the movable member 3 will be prevented by the temporary support member 9 disposed on the support device 1. Since it can be controlled by the connected support members 10, it is possible to prevent damage to the bridge girder G due to tilting, and it is also possible to reduce complicated movement control and frequent position adjustment work.

Further, the temporary support member 9 connected by the support member 10 can be easily removed by pushing out the temporary support member 9 with the connection member 6 fixed to the sole plate 5 during extrusion construction and replacing it with the connection member 6. This eliminates the need for complicated removal work.

In addition, in this construction method, if the bridge girder G moves in the direction perpendicular to the bridge axis by more than a certain amount to provide support for the extrusion work, adjustment work is performed to return the bridge girder G to its normal position.

In addition, in this embodiment, the support member 10 is attached to the temporary support member 9.
The adjusting member 35 is screwed into the connecting hole 34 provided in the
Although the mode of tensioning is shown using the connecting hole 34 and the adjusting member 35, various modes can be adopted such as directly attaching it to the temporary support member 9 by welding or the like using a highly rigid shaped steel etc. It is something. Furthermore, upper shoe 4 and sole plate 5
A connecting member 6 is arranged on the sole plate 5 near where the upper shoe 4 and the sole plate 5 match,
The temporary support member 9 on the upper shoe 4 is removed without lifting the bridge girder G, and the upper shoe 4 and sole plate 5 are removed.
Although a mode in which the sole plate 5 is fixed via the connecting member 6 has been shown, the temporary support member 9 is placed on the upper shoe 4 until the upper shoe 4 and the sole plate 5 match, without using the connecting member 6. In this state, the bridge girder G is lifted up, the temporary support member 9 on the upper shoe 4 is removed, and then the bridge girder G is lifted up.
It is also possible to adopt a mode in which the upper shoe 4 and the sole plate 5 are directly fixed by pulling down.

Note that this is an erection construction method in which a temporary support member 9 is arranged on the support device 1, the lower shoe 2 and the movable member 3 of the support device are slid by a pushing device, the support device 1 is pushed a certain distance, and the work is repeated. Also, the same effects as in this embodiment can be obtained.

The present invention has the above-mentioned configuration, and even if the bridge girder constructed using the extrusion construction method moves in the direction perpendicular to the bridge axis during extrusion construction, the tilting of the upper shoe and the movable member will not affect the temporary support member disposed on the support device. Since the bridge girder can be controlled by mutually connected supporting members, damage to the bridge girder due to tilting can be prevented, and complicated movement control and adjustment work can be reduced, which has a great effect of improving the efficiency of erection work.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the extrusion construction method using a conventional bearing device, Figures 3 to 5 are explanatory diagrams of the extrusion state of a bridge girder using a conventional bearing device, and Figure 6 7 is a partially vertical front view of the bearing device of the present invention during extrusion of the bridge girder, and FIG.
FIG. 8 is a partially longitudinal side view of the bearing device of the present invention during extrusion of a bridge girder, FIG. 8 is a partially longitudinal side view of the supporting device of the present invention after construction, and FIG. 9 is a partially longitudinal front view thereof. . 1: Support device, 2: Lower shoe, 3: Movable member, 4:
Upper shoe, 5: Sole plate, 9: Temporary support member, 1
0: Support member.

Claims (1)

[Claims] 1 Place the bridge girder with the sole plate fixed to the bottom surface on the support device fixed on the bridge pier, push out the top of the support device sequentially, and connect the sole plate of the bridge girder and the upper shoe of the support device at the erection position. In a bearing device used in the extrusion construction method of fixed bridges, the bearing device consists of an upper shoe, a lower shoe, and a movable member arranged between the upper and lower shoes. They are fixed facing each other in the direction perpendicular to the bridge axis across the line, and on the upper surface of the upper shoe of the support device, a temporary support member extends from the center of the support device to the side edge of the bridge girder in order to support the web of the bridge girder. The temporary support members are fixed to each side with their centers eccentrically arranged, and the temporary support members are connected to each other by support members in a direction perpendicular to the bridge axis in order to restrict tilting of the upper shoe of the support device and the movable member. A bearing device for bridge extrusion construction method featuring the following.