JPH02190504A - Precast reinforced concrete abutment - Google Patents

Abstract

PURPOSE:To make precast concrete construction of homogeneous and strong abutment available by providing a bridge-girder-accepting step and a bottom board member respectively at the upper and the lower parts of an individual wall member, and by providing insert anchors and connecting members for connecting the individual wall members in the breadthwise direction. CONSTITUTION:A precast reinforced concrete abutment is constructed, comprising an individual wall member 1, with a bridge-girder-accepting step 2 and a bottom board member 3 provided respectively at the upper and the lower parts, and connecting members 6 and 6 provided at the side faces for connecting breadthwise the individual walls. The connection by the connecting members 6 and 6 is made by providing insert holes 8 to the side of the individual wall 1 or to the side of the bottom board member 3 and also by providing connecting bar members 7 and 7 that are inserted into the holes 8, and by connecting a plurality of the abutments in the breadthwise direction. PC steels are used as the connecting bars, and the steels are bound so that precompression is applied to the concrete. Insert anchors 4 and 4 are embedded at the inside of the bottom board member 3 for connection with reinforcements 5 and 5 for cast-in-site concrete that is to construct counterforts, buttresses or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reinforced concrete abutment that can be provided as a precast product.

<Conventional technology> Conventional precast reinforced concrete abutment (or pier)
Most of the construction methods used were cast-in-place, and there were no precast products at all. One of the reinforced concrete 1-abutment bridges has a heavy overall weight, so it is necessary to install it in a location with good ground or to take measures to deal with subsidence, such as driving piles or replacing the ground.

In addition, the structure of the Reinforced Concrete 1 bridge abutment is made up of the side walls, the girder holder above it, the bottom slab at the bottom, and the buttress at the back, so the structure is complicated when cast on site, and the construction period is long. Construction often takes a long time, and if it rains heavily during construction, water damage may occur, resulting in unreliable construction. Furthermore, since construction is often carried out near rivers, there is a lot of underground water, etc., which often requires pumping up and is expensive.

<Problems to be Solved by the Invention> Therefore, in the present invention, the reinforced concrete 1-abutment is made into a precast product that can be produced in a factory to reduce its weight.
The idea is to add some innovation to the bottom slab to make it possible to integrate it with cast-in-place concrete.

<Means for Solving Problem 8> As a result of various studies to solve the above am, we found that it consists of a side wall (1), an upper bridge girder receiving part (2), and a lower bottom slab part (3). Precast reinforced concrete characterized by providing a connecting means (6) and integrating the connection.
He developed a bridge abutment.

The connecting means (6) in the width direction referred to here means 1, for example, an insertion hole (8) of the connecting steel material (7) to the side wall (1) or the bottom plate (3).
) is inserted through the connecting steel material (7) to connect a plurality of pieces in the width direction.
Concrete) It is recommended to use pp material to tighten the concrete to pre-compress it.

Further, an insert anchor (4) is buried in the bottom plate (3). This is a female threaded member into which a male threaded part provided at one end of a reinforcing bar (5) is buried in a part of cast-in-place concrete called a buttress or buttress, or one of other connecting means. It is a member of

Effect> Precast I/reinforced concrete of the present invention -1-
The abutment can be manufactured by molding as a precast product in a factory, rather than by casting in place. Since the abutment is divided into a plurality of parts, and the bottom slab part (3) is separated from the buttress, it is lightweight and compact, making transportation and construction easier. Also, the connection is 11) C
Since the steel material can be fastened under pre-compression, the strength is increased.

By the buried insert 1-anchor (4),
The bottom slab was extended and integrated with the buttress by on-site casting,
It becomes a stable abutment.

<Example> Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of the precast reinforced concrete 1-abutment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the bottom slab.

As seen in these figures, a plurality of precast reinforced concrete 1 bridge abutments of the present invention can be connected in the width direction. In this example, two Brecaster 1-reinforced concrete abutments are connected in the width direction. What makes this possible is the connecting means (6). The connecting means (6) in this example is a boss 1 to
It is a tensicon system, with an insertion hole (8) provided in the side wall (1) and the bottom plate (3), through which the tension PC steel material of the connecting steel material (7) is inserted and one end is fastened. The two members are fixed, and the other side is tensioned by applying a necessary amount of load with a hydraulic jack.7 This allows the two members to be completely integrated in the lateral direction.

Furthermore, an inserter 1-anchor (4) is embedded in the bottom plate (3). In this example, the insert anchor (4) has a female screw structure, and is connected by screwing into a male screw portion provided at one end of a reinforcing bar (5) buried in a buttress-like wall. The insert anchors (4) may be installed on both sides of the bottom plate (3) or on the F side. Note that the inserter 1 to the anchor (4) can be replaced with other connecting means.

Precast I-Reinforced Concrete 1-Abutment with such a structure consists of a side wall (1), a bridge girder receiver (2) above it, and a bottom slab section (3) at the bottom. The side wall (1) has a masonry pattern on the front in this example.

Is the side wall (1) IP? ! ? I don't mind if it's a face. J, in that grooves (joints) (9) are provided at the edges of the side walls;
vinegar.

Since the joints between the precast reinforced concrete abutments connected in the width direction are filled with mortar, the product of the present invention is integrated through this mortar.

<Effects of the Invention> Since the structure is as shown in the precast reinforced concrete abutment diagram of the present invention, r! It can be manufactured by molding as a precast product at a factory, without relying on AI stamping. Since it is homogeneous and has high strength, it is lightweight and compact, making it easy to transport and install.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the precast reinforced concrete 1 to the abutment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of the bottom slab. (1) Side wall (2) Receiving portion (3) Bottom plate portion (4) Inner anchor buttress-like wall reinforcing bar connection steel connection means insertion hole recessed groove

Claims (1)

[Claims] 1. Consists of a side wall (1), an upper bridge girder receiving part (2), and a lower bottom plate part (3), and is characterized by being provided with a connecting means (6) in the width direction. Precast reinforced concrete abutment. 2 Insert the reinforcing bar (5) into the bottom slab (3) (
4) The precast reinforced concrete abutment according to claim 1, wherein the precast reinforced concrete abutment is embedded.