JPS6160205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sliding bearing device used in an extrusion construction method for concrete bridge girders.

Conventionally, in the extrusion construction method of concrete bridge girders, as shown in Fig. 1, when the bridge girder G is pushed forward and erected on the pier B, a temporary structure consisting of an appropriate support such as a steel platform or a concrete block is placed on the pier B. A supporting device A is disposed, and the bridge girder G is loaded on the temporary support stand A, and by pushing the bridge girder G, it is slid between the temporary support stand A and the bridge girder G and pushed out. , or by configuring the temporary support A to be able to slide back and forth, and allowing the bridge girder G loaded on the temporary support A to slide back and forth on the temporary support A, the bridge girder A method of pushing out G is adopted.

However, in both of the above methods, the bridge girder G
After reaching the designated position and completing the erection,
There were inconveniences such as the complicated work of removing the temporary support device A and installing a regular support device to support the bridge girder G.

In order to solve these inconveniences, a special application was filed in 1972.
151058, patent application 151059, and patent application 1972-
151060, without using the support devices shown in FIGS. 2 to 4, that is, the temporary support device A, a regular sliding bearing device C is used, for example, the movable member is a combination of a sealed rubber bearing and a sliding plate. Using a sliding bearing device or a sliding bearing device using a bearing plate with a curved surface,
During erection, the bearing device is made to function as a temporary support device, and after the erection is completed, the bearing device is fixed as it is to exert the desired supporting function, and after the erection is completed, the bearing device is left as is. A sliding bearing device C has been proposed which is fixed and exhibits a desired bearing function.

Specifically, the lower shoe 1, movable member 2, and upper shoe 3 of the sliding bearing device C are stacked on top of each other from below on the pier B, and the sole plate 4 is arranged on the bridge girder G. By placing G on the upper shoe 3 and sliding the movable member 2 on the lower shoe 1 using the pushing device D, the bridge girder G loaded on the upper shoe 3 is moved forward a certain distance (stroke). After pushing out and pushing out for a certain stroke, lift up the bridge girder G with the vertical jack F, make the movable member 2 unloaded, return it to the original position together with the upper shoe 3, load the bridge girder G onto the upper shoe 3 again, and push it out. A sliding bearing device has been proposed in which the operation is repeated until the bridge girder G reaches a predetermined position, and when the bridge girder G reaches the predetermined position, the upper shoe 3 and the sole plate 4 are fixed.

However, since the slide bearing device C is installed at a predetermined position on the pier B and the bridge girder G is pushed out, the support point is limited due to the strength of the bridge girder G during the extrusion construction, and the so-called lopsided problem remains. ing.

That is, as shown in FIG. 3, in a box-shaped cross-section girder, the sliding bearing device C can be installed in the part where the sliding bearing device C is installed, and the sliding bearing device C can be installed in advance on the bridge girder G, and the concentration that acts after and during the extrusion construction can be reduced. Although it is formed with increased strength to sufficiently withstand the load, after erection, the lower slab part I of the bridge girder G is structurally extruded and the part located between the bridge piers, so-called between the spans, is concentrated during construction. Since it is not formed to withstand loads, the support point of this part during extrusion erection is limited to the abdomen H of the bridge girder G.

Therefore, as shown in FIG. 4, in the sliding bearing device C, during extrusion construction, the sliding bearing device C supports only the abdomen H without supporting the lower slab portion I of the bridge girder G. A support plate 5 supporting the abdomen H must be disposed on the upper shoe 3 of the bearing device so that the load of the bridge girder G is received by a portion of the sliding bearing device C. There remained the problem that a load was generated and a problem occurred in the extrusion operation.

The present invention was made to solve these problems, and when a bridge pier is extruded and erected, the sliding bearing device is placed below the belly of the bridge girder so that the sliding bearing device supports the entire load of the bridge girder. To obtain a sliding bearing device which can be moved and returned to a predetermined support position after being erected.

In other words, in a sliding bearing device that includes a sole plate, a bed plate, and a support section consisting of an upper shoe, a movable member, and a lower shoe between the plates, the generally flat sole plate has its lower surface flush with the lower surface of the bridge girder. Face up to the pier,
A bed plate having opposing protrusions at both ends in the bridge axis direction is fixed to the bridge piers with the protrusions facing upward, and a movable member on the lower shoe and an upper shoe are arranged on the bed plate. The lower foot of the supporting part is fitted between the protrusions of the bed plate, and the lower foot is placed on the bed plate so that it does not move in the direction of the bridge axis. After moving the bearing part from its normal position in the direction perpendicular to the bridge axis so that the bearing part supports the edge of the bridge girder in the direction perpendicular to the bridge axis and temporarily fixing it to the bed plate, the bridge girder is placed on the upper shoe of the bearing part. The bridge girder on the upper shoe is moved by loading a load and sliding the movable member on the lower shoe, and after erection, the temporary fixing of the support part on the bed plate is removed and the sole plate is fixed to the bridge girder. The lower shoe and the bed plate, and the upper shoe and sole plate are respectively fixed at these positions to support the bridge girder. The present invention provides a sliding bearing device for extrusion construction method.

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

5 to 8, reference numeral 10 denotes a sliding bearing device placed on the pier B, and the sliding bearing device 10 includes a bed plate 12 fixed to the pier B with anchor bolts 11, 11, etc. It is composed of a support part 13 disposed on a bed plate 12, and a sole plate 15 fixed to the bridge girder G with anchor bolts 14, 14, etc.

The bed plate 12 has corresponding protrusions 16, 16 protruding upward at both ends in the bridge axis direction, and bolt holes 17, 1 at both ends in the direction perpendicular to the bridge axis.
7 is provided.

The support portion 13 is formed by protrusions 16, 1 on the bed plate.
A generally flat-shaped lower shoe 18 is fitted between the lower shoes 18 and 18 so as not to move in the bridge axis direction.
Movable member 19 placed on 8 and movable member 19
It is composed of an upper shoe 20 placed on top.

The movable member 19 has a recess 22 in its lower surface into which a sliding plate 21 is fitted, and a push-out device D that engages with the lower shoe 18 in the direction perpendicular to the bridge axis is connected to both ends thereof in the direction perpendicular to the bridge axis. A protrusion 24 having a connecting hole 23 is provided, and a pot-shaped recess 26 in which a rubber elastic body 25 is housed is formed on the upper surface of the protrusion 24 .

The upper shoe 20 has a protrusion 27 on its lower surface that fits into the pot-shaped recess 26 of the movable member 19 and presses the rubber elastic body 25, and locking holes 28, 28 are formed on both ends in the direction perpendicular to the bridge axis. has been done.

The sole plate 15 has a generally flat plate shape, and bolt holes 29, 29 are formed at both ends of the sole plate in the direction perpendicular to the bridge axis, to match locking holes 28, 28 provided in the upper shoe 20 of the support portion 13.

The sole plate 15 is made at the time of manufacturing the bridge girder G.
After the bridge girder G is erected, it is placed in advance at a position that matches the sliding bearing device 10 that is placed in advance on the bridge pier B, and is buried and fixed with its lower surface flush with the bridge girder G.

Reference numerals 30 and 30 denote locking members, which are connected to the bolt holes 17 and 17 of the bed plate 12 when the bridge girder G is constructed.
The lower shoe 18 is temporarily fixed to the bed plate 12 using a bolt screwed into the bottom plate 12.

Reference numerals 31 and 31 denote fixing members, which fix the lower shoe 18 to the bed plate 12 after the bridge girder G has been erected using bolts screwed onto the bolts 17, 17 of the bed plate 12.

32 is a support plate, and the support plate 32 is the upper shoe 2 of the support part.
0, and during construction, it comes into contact with the end edge of the bridge girder G in the direction perpendicular to the bridge axis, the so-called abdomen H, to support the bridge girder G and protect the upper shoe 20.

When pushing out the bridge girder G, a vertical jack for lifting or lowering the bridge girder G is placed on the pier B, and a bed plate 1 fixed to the pier B is placed.
2, the bearing part 13 of the sliding bearing device 10
is moved from its normal position toward the edge of the bridge girder G in the direction perpendicular to the bridge axis, and this edge, that is, the abdomen H is supported by the support portion 13. In this state, the lower shoe 18 is temporarily fixed to the bed plate 12 by the locking members 30, 30.

Next, the bridge girder G is molded into a unit shape of several meters to several tens of meters on a production table installed behind the abutment, and after the concrete has hardened, hand-stretched girders are attached to the bridge girder G. A pushing device placed on the upper shoe 20 and connected to the movable member 19 moves the movable member 19 to the lower shoe 18.
By pushing on the upper part, the slide plate 21 arranged in the recess 22 provided on the lower surface is slid by a certain distance (stroke), that is, the length of the lower shoe 18 in the bridge axis direction. Then, push out the bridge girder G (see Figures 5 and 6).

Next, at this point, the vertical jack is raised to lift the bridge girder G from the upper shoe 20 of the support part.
0, and by pulling the push-out device, the support part 13 is returned to its original position. After that, the upper foot 20 of the support part is removed by pulling down the vertical jack of the bridge girder G again. The operation of placing it on top and extruding it with an extrusion device is repeated, and on the empty production table, concrete is poured onto the bridge girder G pushed forward to manufacture the bridge girder G, and the sole plate 15 fixed in advance to the bridge girder G is The above operation is performed until a predetermined sliding bearing device 10 is reached.

Then, the bridge girder G that has reached a predetermined position is lifted up with a vertical jack at that position, the locking member 30 is removed, the support part is released from the bed plate 12, and the sole plate with the support part 13 fixed to the bridge girder G is removed. 15
Return to the normal position perpendicular to the bridge axis so that it matches the Furthermore, the support plate 32 on the support part 13 is removed, and the vertical jack is pulled down, and the bridge girder G is directly loaded on the support part 13 so that the sole plate 15 directly contacts the upper shoe 20, and the sole plate 15 and the upper shoe 20 through the locking hole 2 of the upper shoe 20.
It is fixed by screwing the bolts arranged at 8 and 28 into the bolt holes 29 and 29 of the sole plate,
And the member 3 fixing the lower shoe 18 to the bed plate 12
1 and 31.

The extrusion device and vertical jack are then removed to complete the erection. (See Figures 7 and 8).

That is, the sliding bearing device 10 of the present invention eliminates displacement such as inclination of the bridge girder G that occurs during and after the bridge girder G is erected by deforming the rubber elastic body 25 disposed on the movable member 19, and Expansion and contraction is eliminated by sliding of a sliding plate 21 arranged on the lower shoe 18 and the movable member 19.

By configuring the sliding bearing device 10 in this manner, the abdomen H of the bridge girder G can be supported by the entire sliding bearing device 10, and extrusion can be performed without damaging the bridge girder G.

9 and 10 show other embodiments of the bearing part 13.

That is, in this aspect, the movable member 19 of the support portion 13
, the lower surface is a flat surface 33 and the upper surface is a convex curved surface 34
It is a bearing plate type, and the upper shoe 2
A concave curved surface 35 is formed on the lower surface of the movable member 19 on which the convex curved surface 34 of the movable member 19 slides, and protrusions 37 are protruded from both ends of the convex curved surface 35 in the direction perpendicular to the bridge axis. A hole 36 is bored therein.

With this configuration, displacement such as inclination of the bridge girder G that occurs during and after erection is caused by the sliding contact between the convex curved surface 34 of the movable member and the concave curved surface 35 of the upper shoe, and expansion and contraction of the bridge girder G after erection is caused by the movement of the movable member. They are removed by sliding contact between the flat surface 33 and the lower shoe 18.

In addition, the sliding movement when pushing out the bridge girder G is at the lower shoe 18.
This is done by sliding contact between the movable member and the flat surface 33 of the movable member.

The present invention has the above-described configuration, and can support the edge of the bridge girder when the bridge girder is being erected, and at a predetermined position after the bridge girder is erected, so as to prevent damage to the bridge girder, thereby improving the efficiency of the erection work. It has great effects such as:

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the extrusion method, Figs. 2 to 4 are explanatory diagrams of the extrusion state of a bridge girder using a conventional sliding bearing device, and Fig. 5 is an explanatory diagram of the extrusion method of the present invention when extruding a bridge girder. FIG. 6 is a partial vertical sectional view of the sliding bearing device, and FIG. 7 is a partial vertical sectional side view thereof.
The figure is a partially longitudinal front view of the sliding bearing device of the present invention after erection, FIG. 8 is a partially longitudinal side view thereof, and FIG.
The figure is a partially vertical front view of another embodiment of the sliding bearing device, and FIG. 10 is a partially vertical side view thereof. DESCRIPTION OF SYMBOLS 10...Sliding bearing device, 12...Bed plate, 13...Bearing part, 15...Sole plate, 16...Protrusion, 18...Lower shoe, 19...Movable member, 20...Upper shoe.

Claims (1)

[Claims] 1. A substantially flat sole plate is fixed to the bridge girder so that its lower surface is flush with the lower surface of the bridge girder, and a bed plate with projections projecting upward corresponding to both ends in the bridge axis direction is fixed to the upper surface of the bridge pier. A support portion consisting of a lower shoe, a movable member, and an upper shoe is interposed between the bed plate and the sole plate, and the lower shoe cannot be moved in the bridge axis direction between the convex portions of the bed plate. The bearing part and the bed plate are fitted together so as to be movable in the direction perpendicular to the bridge axis. A sliding bearing device for an extrusion construction method, characterized in that the sliding bearings are capable of being fixed to each other in a state in which the sliding bearings are arranged at regular positions to support the central part of the bridge girder in the direction perpendicular to the bridge axis.