JPS5841365B2 - Sliding installation method for structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the problem of drying shrinkage of the concrete structure that occurs in the initial stage of installation when a concrete bridge girder or other concrete structure is installed via a rubber support. The present invention relates to a sliding installation method for a structure that can prevent or significantly reduce shear deformation in a rubber support due to creep or the like due to stress introduction.

Next, the present invention will be explained in detail using illustrated examples.

1 to 4 show a first embodiment of the present invention. First, as shown in FIGS. 1 to 3, the direction in which the concrete structure moves in the flat steel support plate main body 7 is In the shallow recess provided on the upper surface of the middle part of the
By inserting a sliding plate 2 made of a thin plate (registered trademark name) and fixing it with adhesive or baking, a sliding plate 2 of a required length with a low coefficient of friction is provided on the upper surface of the intermediate part, and at the end of the concrete structure in the moving direction. A sliding bearing plate 4 having a sliding suppressing part 3 on the upper surface thereof is constructed, and a large number of anchor reinforcing bars 8 are fixed to the back side of the bearing plate main body 7, and the sliding bearing plate 4 with anchor reinforcing bars is attached to concrete such as an abutment or a bridge pier. Embedded and fixed in the upper surface of the manufactured support stand 1.

Next, an end of a concrete structure 6 such as a bridge girder is placed on the sliding layer 2 via a rubber support 5 made of a composite of a rubber layer 5A and a hard plate 5B. ) A sliding allowable distance is provided between the lower edge of the intermediate side of the structure and the edge of the sliding layer 2 on the intermediate side of the concrete structure.

When the concrete structure 6 is installed in this manner, when drying shrinkage of the concrete structure in the initial stage of installation or creep due to the introduction of prestress occurs, the rubber support 5 is attached to the concrete structure along with the end of the concrete structure 6. The rubber support 5 slides in the direction of arrow A toward the intermediate side of the structure, and as shown in FIG. 4, when the permissible slip distance becomes zero, the rubber support 5 stops sliding.

Therefore, by setting the permissible slip distance to be approximately equal to or slightly larger than the amount of movement of the end of the structure at the initial stage of concrete structure installation, it is possible to prevent drying shrinkage and prestress during the initial stage of concrete structure installation. It is possible to prevent the rubber bearing from being subjected to shear deformation due to creep or the like due to introduction, or to significantly reduce the shear deformation.

FIG. 5 shows a second embodiment of the present invention, in which a sliding plate 2 made of a fluororesin plate is fixed to the upper surface of the intermediate portion of the steel plate 9 with an adhesive or the like, and the upper surface of the periphery of the steel plate 9 is , a sliding suppressing part 3 made of a thin steel plate is placed in contact with or close to the periphery of the sliding plate 2 and fixed by welding, and the fluororesin plate and the thin steel plate each have a thickness of 17 nm, for example. things are used.

When carrying out this invention, the upper surface of the sliding suppressing part 3 may be higher than the upper surface of the sliding plate 2.

Further, the upper surface of the sliding suppressing portion 3 may be roughened by sandblasting, shot blasting, or the like.

According to the present invention, a sliding plate 2 having a required length and a low friction coefficient is provided on the upper surface of the intermediate portion on the upper surface of a support base 1 such as an abutment or a bridge pier, and a sliding suppressing portion 3 is provided on the upper surface of the end portion in the moving direction of the concrete structure. The sliding plate 2 in the sliding bearing plate 4 having
Since the concrete structure 6 is placed on the rubber support 5 through the rubber support 5, drying shrinkage that occurs in the initial stage of installation of the concrete structure 6, creep due to the introduction of prestress, or both phenomena may occur along with the support of the concrete structure. The rubber bearing 5 can be made to slide, so that shearing deformation of the rubber bearing 5 can be prevented or significantly reduced during the initial stage of installation of a concrete structure, and furthermore, the shearing deformation can be significantly reduced. When the initial sliding of the rubber support 5 ends, the edge of the rubber support 5 on the intermediate side of the structure reaches the vicinity of the edge of the sliding plate 2 on the intermediate side of the structure, so that the drying shrinkage and creep phenomenon are completed. Later, when the concrete structure 6 is shortened due to a drop in temperature, the sliding of the support body 5 is suppressed by the sliding suppressing portion 3 on the upper surface of the end of the sliding bearing plate 4 in the moving direction of the concrete structure, so that the rubber bearing The sliding layer 2 used in the present invention can secure the position of the body 5 within a predetermined range on the sliding bearing plate 4 and allow contraction of the concrete structure due to shear deformation of the rubber bearing in a safe state. The sliding bearing plate 4 having the sliding suppressing portion 3 includes a flat steel bearing plate body 7 and its bearing plate body 7.
Since the sliding plate 2 is fitted and fixed in the recess on the upper surface, the construction is extremely simple and can be manufactured economically, so that the sliding installation of concrete structures can be carried out economically. Effects such as being able to perform the following can be obtained.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional side view showing the state before the rubber bearing starts sliding, FIG. 2 is a plan view thereof, and FIG. FIG. 3 is an enlarged view of a part of FIG. 1, and FIG. 4 is a longitudinal sectional side view showing a state in which the rubber support has finished sliding. FIG. 5 is a longitudinal sectional side view showing a second embodiment of the invention. In the figure, 1 is a support base, 2 is a sliding plate, 3 is a sliding suppressor, 4 is a sliding bearing plate, 5 is a rubber bearing, 6 is a concrete structure, 7 is a bearing plate main body, and 8 is an anchor reinforcing bar.

Claims (1)

[Claims] 1. A recess is provided on the upper surface of the intermediate portion of the flat steel support plate main body 7 in the direction of movement of the concrete structure, and a sliding plate 2 having a lower coefficient of friction than the steel support plate main body 7 is fitted and fixed in the recess. A sliding bearing plate 4 having a sliding suppressing portion 3 on the upper surface of the end in the moving direction of the concrete structure is constructed, and the sliding bearing plate 4 is fixed to the upper part of a support base 1 such as an abutment or a bridge pier, and the sliding bearing plate 4, a concrete structure 6 is placed on the sliding layer 2 via a rubber support 5, and then the support portion of the concrete structure 6 is horizontally moved due to drying shrinkage of the concrete structure 6, creep due to prestress introduction, etc. All sliding installation conditions for a structure, characterized in that the rubber support 5 is slid to the vicinity where it abuts against the sliding suppression part 3.