JPH06128909A - Precast reinforced bridge pier block construction and bridge pier using it - Google Patents

Abstract

PURPOSE:To obtain a lightweight bridge pier having high twisting and bending resistance by precasting a longer block with a U-shaped section having a plurality of partition walls inside the longer block together with reinforced concrete as a unit, and butting a plurality of longer blocks to make them as a unit. CONSTITUTION:A plurality of partition walls 13 are provided lengthwise of a column body 12 having a U-shaped section at specific intervals, and they are precasted together with reinforced concrete as a unit to form a longer block 11. After that, recessed grooves 14 of the ends of a plurality of blocks 11 are butted, and a plurality of blocks are connected together as a unit to form a specific bridge pier. The partition walls 13 change partition walls of blocks corresponding to them and phases and can be arranged in zigzag. According to the constitution, lightweight and cost reduction of the bridge pier can be made.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a precast rebar pier block and a pier using the precast rebar pier block.

[0002]

2. Description of the Related Art Conventional piers have been manufactured by forming a mold with a reinforcing bar at the site, pouring ready-mixed concrete into it, and hardening it. For this reason, it is difficult to shorten the construction period, and it is indispensable to secure craftsmen and workers at the site, which is unsuitable for bridge pier construction in urban areas where road conditions are poor, and at the same time does not meet the recent shortage of manpower. It was a thing.

In order to improve the drawbacks of the above-mentioned cast-in-place pier, there has been proposed a pier in which a precast rebar pier block produced in a factory in advance is carried into the site and assembled. (JP-A-58-123907, JP-A-59-206506, JP-A-2-190504
(See Japanese Laid-Open Patent Publication No. Hei 2-311606)

FIG. 9 shows a precast rebar pier block known in Japanese Patent Application Laid-Open No. 59-206506. Referring to the drawing, a large number of circular or rectangular precast rebar pier blocks 1 are vertically assembled to form a pier 2. It is a thing.

FIG. 10 shows a precast rebar pier block known in Japanese Patent Application Laid-Open No. 2-311606. Referring to the drawing, square flat plate portions 4 are integrally formed on the upper and lower ends of a square and solid bridge column portion 3. The precast rebar pier block 5 formed in FIG. This precast rebar pier block 5 forms the pier itself.

[0006]

However, the above-mentioned known precast rebar pier blocks have the following problems.

In the case where a large number of individual precast rebar pier blocks 1 are vertically assembled to form a pier 2 as shown in FIG. 9, the pier 2 is weak against bending moment and torsion moment, and is also suitable for construction work on site. It's a hassle. For this reason, there are difficulties in terms of strength as well as in shortening the construction period.

Further, in the precast rebar pier pier block 5 consisting of the solid bridge post portion 3 and the flat plate portion 4 shown in FIG. 10, the drawbacks of the bending moment and the torsion moment are eliminated, but the bridge post portion 3 However, since it is solid, it is heavy and difficult to convey, and the material cost is high due to the solid content.

In order to solve each of the above-mentioned drawbacks, FIG.
As shown in FIG. 1, a precast rebar pier block 7 having a hollow portion 6 may be used, but such a structure is impossible in terms of molding.

Therefore, an object of the present invention is to provide a precast rebar pier block which is strong against bending moments and torsion moments, is lightweight, and at a low cost, and a pier using the precast rebar pier blocks. is there.

[0011]

A feature of the present invention is that it comprises a long columnar body made of reinforced concrete and having a U-shaped cross section, and a plurality of partition walls in the longitudinal direction of the columnar body. In a precast rebar pier block in which a plurality of precast rebar pier blocks are formed.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a perspective view showing a precast rebar pier block according to an embodiment of the present invention, FIG. 2 is a plan view, and FIG.
Is a front view. FIG. 4 is a perspective view showing a structure in which two precast rebar pier blocks shown in FIG. 1 are butted.

Referring to the drawing, a precast reinforced concrete pier block 11 is made of reinforced concrete and has a long pillar 12 having a U-shaped cross section, and a plurality of pillars 12 are formed in the longitudinal direction of the pillar 12. It is composed of a partition wall 13. Column part 1
A groove 14 for attaching a seal is formed in the longitudinal direction on the open side of 2. When assembling as a pier 15, attach a seal (not shown) to the groove 14,
The open sides of the pillar portions 12 are butted against each other and fastened together by a piano wire or the like (not shown), and both are integrated.
The illustrated precast rebar pier block 11 has, for example, a length of 10 M and a longitudinal and lateral width of about 1.2 M, but the length and the longitudinal and lateral width are changed depending on the installation conditions of the pier.

FIG. 5 and FIG. 6 show a structure in which precast rebar pier blocks according to another embodiment of the present invention are combined to form a pier. In this embodiment, two piers are installed facing each other. Partition walls 22a, 2 formed on the precast rebar pier blocks 21a, 21b
2b are vertically offset from each other, and the partition walls 22a and 22b have a projecting portion 23, which is a mating precast rebar pier block 21.
It is configured so as to protrude into the concave spaces of a and 21b.

The precast rebar pier blocks 11, 21a, 21b of the present invention configured as described above are manufactured in advance in a factory and transported to the site. Then, the necessary number of pieces are butted and tightened to form a bridge pier, which is erected.

It is apparent from the purpose of the present invention that the number of precast rebar pier blocks 31 to be butted may be three as shown in FIGS. 7 and 8 or four.

[0017]

The effects of the present invention, which is constructed and operates as described above, are as follows. The pier is partially hollow, so it is lightweight and low cost. Since it has a partition wall, it has a strong structure against torsion moment. Since it is not divided vertically, it has a structure that is resistant to bending moments.

[Brief description of drawings]

FIG. 1 is a perspective view of a precast rebar pier block showing an embodiment of the present invention.

FIG. 2 is a plan view of the precast rebar pier block of FIG.

3 is a front view of the precast rebar pier block of FIG. 1. FIG.

FIG. 4 is a perspective view of two precast rebar pier blocks of FIG. 1 butted together to form a pier.

FIG. 5 is a front view of a precast rebar pier block showing another embodiment of the present invention.

FIG. 6 is a side view of the precast rebar pier block of FIG.

FIG. 7 is a side view showing another embodiment of the butting structure of the precast rebar pier block of the present invention.

FIG. 8 is a side view showing still another embodiment of the butt structure of the precast rebar pier block of the present invention.

FIG. 9 is a side view of a known precast rebar pier block.

FIG. 10 is a side view showing another known precast rebar pier block.

11 is a cross-sectional view showing an example of a lightweight structure of the precast rebar pier block shown in FIG.

[Explanation of symbols]

 11 Precast Reinforced Pier Blocks 12 Columns 13 Partition Walls 14 Grooves 15 Piers 21a, 21b Precast Reinforced Pier Blocks 22a, 22b Partition Walls 31 Precast Reinforced Pier Blocks

Claims (2)

[Claims] 1. A precast rebar pier, comprising a long columnar body made of reinforced concrete and having a U-shaped cross section, and a plurality of partition walls formed in the longitudinal direction of the columnar body. Block structure. 2. A plurality of precast rebar pier blocks, each of which is composed of a long columnar body made of reinforced concrete and having a U-shaped cross section, and a plurality of partition walls being formed in the lengthwise direction of the columnar body. A pier characterized by being [0001]