JPS60484B2 - Support device for cantilever erection method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing device used in a cantilever construction method for concrete bridge girders, and particularly relates to a bearing device that prevents the bridge girder from shifting in the direction perpendicular to the bridge axis and falling during erection. .

This is the first method for cantilever erection of concrete bridge girders.
As shown in the figure, when the bridge girder (superstructure) G is sent forward and erected on the pier (substructure) B, the bridge girder G is sent out on a production table installed behind the abutment for several meters to several meters. After the concrete has hardened, hand-stretched garters A are attached to the bridge girders G manufactured in units of 10 meters in length, and temporary support devices C, such as steel platforms or concrete blocks, are attached to the piers B. The bridge girder G is loaded onto a structure with sliding members arranged on a support platform, and the bridge girder G
The bridge girder G is pulled (or pushed) either directly on the bridge pier B' or using a push-out device D attached to the pier B', and sent out by sliding between the bridge girder G and the support base, or fixed to the pier B, etc. A support stand is placed on the flat plate so as to be able to slide to form a movable support stand, and a bridge girder G is mounted on the movable support stand.
The bridge girder G is sent out by loading (or pushing) the support base on the flat plate with a push-out device D such as a horizontal jack.

In these delivery methods, the displacement of the concession girder G in the direction perpendicular to the bridge axis during the delivery and erection of the bridge girder G, and the bridge girder G when a load such as an earthquake is applied during the erection.
In order to prevent the bridge girder G from falling, for example, as shown in FIG. Explorations are being made to find ways to restrict the movement of

However, these methods have various problems.

In other words, in any of the methods described above, after the bridge girder G reaches a predetermined position and the erection, so-called sending-out, is completed, the temporary support device C and the support member E are removed, and then the regular support device is installed and the bridge girder is completed. It is necessary to support the bridge girder G, and the work of removing the temporary support device C and supporting member E is performed by lifting the bridge girder G using a vertical jack F, etc. As a result, the gap between the bridge girder G and the bridge pier B is not sufficient, and therefore there are problems such as manual input is often required, and the work is complicated and economically unfavorable.

In order to solve these problems, various studies have been carried out, including bearing devices that have a movable member between the upper and lower shoes, which are generally used as bridge supports, such as rolling bearing devices where the movable member is a roller or rocker, and hinge bearings such as pins. The equipment, a sliding support device such as a sliding plate or a bearing plate having a curved surface, a rubber bearing device such as rubber, or a regular support device that combines these are used from the beginning, and the official support device C is not used. When it is installed on a support device, it functions as a temporary support device, and after the installation is completed, the support device remains as it is.)
An erection method in which the bridge is fixed to exhibit the desired support function, for example, as shown in Fig. 3, thin steel plates placed on both ends of the support device S and movable in the bridge axis direction are supported. There is an erection method in which a holding device is installed and the bridge girder G is sent out together with the thin steel plate using an extrusion device ○, or an extrusion device D is attached to the upper foot of the support device S as shown in Fig. 4, and the bridge girder G is sent out with the extrusion device A construction method has been attempted in which the bridge girder G is sent out by sliding (or rolling) the upper shoe on the lower shoe via a movable part village or on a movable member held by the lower shoe. Even in this method, during construction, it is necessary to provide a means to prevent the bridge girder G from shifting in the direction perpendicular to the bridge axis and falling when a load such as an earthquake is applied, such as a member such as a support member E, and There are inconveniences such as the need to remove the support member E after erection.

The present invention has been made to solve these inconveniences. Cantilever construction in which recesses are provided along the bridge axis direction to engage with the convex parts of the upper shoe, and the engagement of the recesses and recesses prevents the bridge girder from shifting in the direction perpendicular to the bridge axis and falling without using support members. A bearing device for the construction method is obtained.

In other words, a movable member is placed between the upper shoe, which has a convex portion at the center of the upper surface, and the lower shoe, which is fixed to the pier, and the upper shoe covers the upper surface and is movable in the direction of the bridge axis. A thin steel plate is placed on the bridge girder, and a recess along the bridge axis is formed on the lower surface of the bridge girder, and a sole plate with a recess on the lower surface connects the recess with the recess of the sister-in-law girder. The bridge girder is fixed at a predetermined position, and the bridge girder to which the sole plate is fixed is movable in the axial direction of the bridge by engaging the concave portion with the convex portion of the upper shoe and supporting the bridge over the upper shoe via the thin steel plate. The present invention provides a support device for a cantilever construction method, characterized in that the support device is supported by a cantilever construction method.

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

Reference numeral 1 denotes a support device disposed between the pier B and the bridge girder G, and the support device 1 has a lower shoe 2, an upper shoe 3, and these upper and lower shoes 2,
The sole plate 5 is fixed to the bridge girder G, and a movable part village 4 is disposed between the bridge girder G and eliminates displacement and expansion/contraction of the bridge girder G. The lower shoe 2 is fixed to the pier B by an anchor bolt 6 or the like, and has a curved surface 7 on one side constituting the movable member 4 on its upper surface, and a flat surface 8 on the other side.
A concave curved surface 10 on which the curved surface 7 of the bearing plate 9 slides, and convex portions 11, 11 protruding from the upper surface are formed at both ends of the concave curved surface 10 in the direction perpendicular to the bridge axis.

The upper shoe 3 has a convex portion 13 projecting upward from the upper surface 12 at the center of its upper surface 12, and locking holes 14, 14 with the sole plate 5 at both ends of the upper surface 12 in the direction of the bridge axis. Step portions 15, 15 are provided at both ends in the right angle direction, and the step portions 15
, 15 has notches 17 that engage with the protruding parts 11, 11 of the lower shoe, leaving ears 16, 16 at both ends of the bridge axis in all directions.
17 is formed.

. Further, the upper shoe 3 has a lower surface 18 formed as a smooth surface, and the lower surface 18 is in sliding contact with the flat surface 8 of the bearing plate constituting the movable member 4 which is covered with an iron bag on the concave curved surface 10 of the lower shoe, Further, the upper surface 12 serves as a joint surface with the sole plate 5.

Reference numerals 19 and 19 designate hook-shaped side blocks that are fixed to the convex portions 11 and 11 of the lower shoe and that vertically lock the step portions 15 and 15 of the upper shoe.

The sole plate 5 has a recess 20 in the center of its lower surface that engages with the convex part 13 of the upper shoe along the bridge axis direction, and bolt holes 21 that match the locking holes 14 of the upper shoe at both ends of the sole plate in the bridge axis direction. ，
21 are provided.

When the bridge girder G is manufactured, the sole plate 5 is placed in advance with anchor bolts 22 and
22, etc., so that its lower surface is on the same plane as the bridge girder G, and the concave part is attached to the recess 23 along the bridge direction provided on the lower surface so that the convex part 13 of the upper shoe engages when the girder G is erected. 20 can be matched and buried and fixed. 24 is a rubber elastic body arranged on the side wall of the recess 23 provided on the lower surface of the bridge girder G, and the rubber elastic body 24 is designed to prevent the convex part 13 of the upper shoe and the bridge girder G from impacting when a load such as an earthquake is applied. This is to alleviate the stress caused by this.

25, 25' are arranged at both ends of the support device 1 in the bridge axis direction,
A holding device that supports a thin steel plate 26 disposed movably in the bridge axis direction on the upper shoe 2 of the support device, and the holding device 25 is arranged at the rear of the support device 1 in the feeding direction,
The holding devices 25' are disposed in front of the supporting device 1 in the feeding direction, and their base portions are fixed to the pier B with bolts or the like.

A holding device 25 arranged at the rear of the support device 1 supports a rolled thin steel plate 26 and serves to send out the thin steel plate 26 during erection, while a holding device 25' arranged at the front serves to wind up the thin steel plate 26 that has passed over the upper shoe 3.

27, 27' are pressure bars of the holding devices 25, 25', and each of the pressure bars 27, 27' has a roller 28 at its tip.
, 28', and the thin steel plate 26 is always pressed against the bridge girder G via the rollers 28, 28' even if slight vertical displacement occurs in the bridge girder G during construction.

Numerals 29 and 29 are locking members disposed between the upper and lower shoes 2 and 3, and the locking members 29 and 29 are located between the notches 17 and 17 of the upper shoe and the protrusions 11 and 11 of the lower shoe. This is to restrict the movement of the upper shoe 3 in the bridge axis direction during construction.

After sending out the bridge girder G, the bearing device 1, the holding devices 25, 25' for disposing the thin steel plate 26 on the bearing device 1, and the vertical jack F for lifting or lowering the bridge girder G are placed on the pier B. The hand-stretched garter A is manufactured on a manufacturing table installed behind the abutment on the thin steel plate 26 on the support device.
The bridge girder G to which the bridge girder G is attached is loaded by engaging the concave portion 23 of the sister-in-law girder G with the convex portion 13 provided on the upper foot of the support device.

After that, using the pushing device D attached to the bridge girder G, the top of the upper shoe 3 is engaged with the convex part 13 of the upper shoe and the concave part 23 of the bridge girder G, thereby removing the displacement of the bridge girder G in the direction perpendicular to the bridge axis. The bridge girder G is sent forward together with the thin steel plate 26 by preventing it from falling and guiding the delivery (see Figures 5 and 6).
, and on the empty production table, concrete is poured onto the bridge girder G that has been sent forward, and the sole plate 5 is fixed in advance to the girder G with its concave portion 20 matching the concave portion 23 of the bridge girder G. The sole plate 5 is fed out one by one until it reaches the supporting device 1, and when the sole plate 5 reaches the predetermined position, the bridge girder G is lifted up by a vertical jack F, and the holding device 25,
The vertical jack F is lowered onto the upper shoe 3 from which the thin steel plate 26 supported by the thin steel plate 25' has been removed, and the concave portion 20 is aligned with the convex portion 13 of the upper shoe, and the jack is loaded. The locking holes 14, 14 of the upper shoe are inserted into the bolt holes 21, 21 of the sole plate.
The upper shoe 3 and the sole plate 5 are engaged and fixed by screwing in the bolts arranged on the upper shoe 3 and the sole plate 5.

Then, the locking members 29, 29, which were arranged between the upper and lower shoes 2 and 3 and restrained the movement of the upper shoe 3 in the bridge axis direction, the pushing device D, the vertical jack F, and the holding devices 25, 25' were removed and the construction was carried out. (See Figures 7 and 8). Here, the thin steel plate 26 at the time of sending out the bridge girder G without sliding between the bridge girder G and the thin steel plate 26.
A sliding member is interposed between the sliding surfaces of the thin steel plate 26 and the upper shoe 3 so that the thin steel plate 26 and the upper shoe 3 can be smoothly slid on the support device 1 and sent out.

With this configuration, it is possible to prevent the bridge girder G from shifting in the direction perpendicular to the bridge axis during erection, and from falling even when a load such as an earthquake is applied during and after the erection, without using the support member E. This can be prevented by the engagement of the convex portion 13 of the shoe with the recesses 20 and 23 provided in the bridge girder G and sole plate 5, and this engagement can also guide the delivery of the bridge girder G.

The bridge girder G is prevented from popping out and falling in the axial direction of the bridge, that is, the so-called erection sending direction during erection, by engaging the step-sister girder G with a production table or the like.

In addition, in the support device 1 of the present invention, displacement such as bending and expansion and contraction of the bridge girder G that occurs after erection is caused by the movable member 4, that is, the curved surface 7 of the bearing plate and the concave curved surface 1 of the lower shoe.
It is removed with the aid of the sliding saddle and the flat surface 8 of the bearing plate and the lower surface 18 of the upper shoe.

In this embodiment, a bearing plate 9 is used for the movable member 4 disposed between the upper and lower shoes 2 and 3. A pot-shaped recess is provided on the upper surface of 2, and an intermediate plate is provided with a rubber elastic body and a sliding member attached to the recess, and the sliding contact between the sliding member and the upper shoe 3 allows the bridge girder G to expand and contract, and the rubber elastic body It is also possible to adopt a sealed rubber type embodiment in which displacements such as inclination are removed by deformation, or a roller type embodiment in which rollers are used to remove displacements such as expansion and contraction and inclination of the bridge girder G by rolling of the low-fu.

In addition, the pushing device D is directly attached to the upper shoe 3, and the pushing device D moves the upper shoe 3 via the movable part village 4 onto the lower shoe 2 by the length of the lower shoe 2 in the bridge axis direction, or the upper shoe 3 on the movable member 4 by pushing the length of the upper shoe shell in the bridge axis direction, and at this point, the vertical jack F is used to raise the bridge girder G and the upper shoe 3 is returned to its original position with no load. The present invention can also be applied to a sending method in which the vertical jack F is lowered, the bridge girder G is again loaded onto the upper shoe 3, and the operation of sending it out by the pushing device D is repeated.

The present invention has the above-mentioned configuration, and has a convex portion on the upper surface of the upper shoe, and a concave portion along the bridge axis direction on the sole plate and the bridge girder, and by engaging the concave and convex portions, it is possible to abut against the side surface of the bridge girder. This technology eliminates the need for support members that were previously provided in the construction, and prevents the bridge girder from being guided during evacuation, misalignment in the direction perpendicular to the bridge axis during erection, and even if loads such as earthquakes are applied to the bridge girder during or after erection. It has an excellent effect of preventing.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the cantilever construction method, Figure 2 is a sectional view showing the arrangement of conventional support members, and Figures 3 and 4 are explanatory diagrams of the cantilever construction method using a support device. , FIG. 5 is a partially longitudinal side view of the supporting device of the present invention when the bridge girder is being sent out, FIG. 6 is a sectional view taken along line M-M in FIG. 5, and FIG. Partial longitudinal cross-sectional side view of the bearing device, No. 8
The figure is a partially longitudinal front view. 1: Support device, 2: Lower shoe, 3: Upper shoe, 4: Support member, 5
: Sole plate, 13: Convex part, 20, 23: Concave part, 2
6: Book steel plate. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A movable member 4 is disposed between an upper shoe 3 having a convex portion 13 at the center of the upper surface and a lower shoe 2 fixed to the pier B. A thin steel plate 26 is disposed so as to be movable in the bridge axis direction, and the bridge girder G has a recess 23 formed on its lower surface along the bridge axis direction. is fixed in a predetermined position by communicating with the recess 23 of the bridge girder G, and the bridge girder G to which the sole plate is fixed engages the recess 23 with the convex part 13 of the upper shoe 3, and the thin steel plate 26 A support device for a cantilever construction method, characterized in that the support device is loaded on the upper shoe 3 through the bridge and is supported movably in the bridge axis direction.