JP2012149400A - Slab reinforcement method using cast-in-place concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slab reinforcement method using cast-in-place concrete capable of improving bearing force as well as rigidity of an existing RC rigid-frame viaduct and implementing a measure against vibration by strengthening connections between slabs as well as between the slab and a beam through simple construction.SOLUTION: A slab reinforcement method using cast-in-place concrete constructs: an additional beam 3 made of cast-in-place concrete arranged at a lower surface 1A of a slab 1 in a direction orthogonal to a railway; hole-in anchors 5 to be driven into the slab 1; and the hole-in anchors 6 to be driven into a beam 4 of the slab 1. Reinforcement of the additional beam 3 is arranged so that axial reinforcement 2B thereof is spliced with the hole-in anchors 6 to be driven into the beam 4 of the slab 1 and a shear reinforcement 2A thereof is spliced with the hole-in anchors 5 to be driven into the slab 1.

Description

  The present invention relates to a method for reinforcing a slab using cast-in-place concrete, and more particularly to a method for reinforcing a slab of an RC rigid frame viaduct using cast-in RC.

  Since the Taisho era when reinforced concrete structures (hereinafter referred to as Reinforced Concrete: RC) came to be used in railway facilities, many ramen viaducts have been constructed. Since many years have passed since the construction of these ramen viaducts, large-scale repairs may be required from the viewpoint of durability and earthquake resistance (see Non-Patent Document 1 below).

Toshiya Tadokoro, “Reinforcement of RC ramen viaduct with arched steel”, RRR 2011.3, pp. 46

However, the existing RC ramen viaduct is currently difficult to replace or refurbish on a large scale due to location conditions and overcrowded service conditions.
In view of the above situation, the present invention is a cast-in-place concrete that can firmly connect a slab and a slab and a slab and a beam with simple construction, improve the strength and rigidity of an existing RC rigid frame viaduct, and can prevent vibration. An object of the present invention is to provide a method for reinforcing a slab using slabs.

In order to achieve the above object, the present invention provides
[1] In a slab reinforcement method using cast-in-place concrete, a reinforcing beam made of cast-in-place concrete installed in a direction perpendicular to the track on the lower surface of the slab, a post-installed anchor disposed on the slab, and the slab A post-construction anchor disposed on the beam, and an axial rebar of the reinforcing beam is joined to a post-construction anchor disposed on the beam of the slab, and a shear reinforcement of the reinforcing beam is the slab After that, the reinforcing beam is arranged so as to be connected to the construction anchor.

[2] In the slab reinforcement method using the cast-in-place concrete as described in [1] above, a steel plate embedded formwork is disposed on the bottom surface of the reinforcing beam.
[3] In the slab reinforcement method using cast-in-place concrete as described in [1] above, an ultrahigh-strength fiber concrete embedded formwork is arranged on the outer surface of the reinforcing beam.

  According to the present invention, slabs using cast-in-place concrete can be used to make the connection between slabs and slabs, slabs and beams robust, and to improve the strength and rigidity of existing RC ramen viaducts and to prevent vibration. Reinforcement method can be applied.

It is a schematic block diagram of the reinforcement construction method of the slab using the cast-in-place concrete which shows 1st Example of this invention. It is a principal part schematic diagram which shows the reinforcement construction method of the slab using the cast-in-place concrete which shows 1st Example of this invention. It is a principal part schematic diagram which shows the reinforcement construction method of the slab using the cast-in-place concrete which constructs the steel plate embedding formwork which shows 2nd Example of this invention. It is a principal part schematic diagram which shows the reinforcement construction method of the slab using the cast-in-place concrete which constructs the ultra high strength fiber concrete embedding formwork which shows 3rd Example of this invention.

  The method of reinforcing a slab using cast-in-place concrete of the present invention includes a reinforcing beam made of cast-in-place concrete installed in a direction perpendicular to the track on the lower surface of the slab, a post-installed anchor disposed on the slab, and the slab A post-construction anchor disposed on the beam, the axial rebar of the reinforcing beam is joined to the post-construction anchor disposed on the beam of the slab, and the shear reinforcement of the reinforcing beam is of the slab. Reinforcing the reinforcing beam so that it is connected to the construction anchor.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic configuration diagram of a slab reinforcing method using cast-in-place concrete according to a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram of the slab looking up from below, and FIG. 2 is a main part showing the reinforcing method. FIG. 2A is a diagram seen from the line direction, and FIG. 2B is a diagram seen from the direction perpendicular to the line.

  In these drawings, 1 is a slab (refers to a structure such as a reinforced concrete floor panel, ceiling panel, or deck), and 3 is a slab made of cast-in-place concrete (RC) installed on the lower surface 1A of the slab 1 in the direction perpendicular to the track. 1 is a reinforcing beam, and reinforcing bars 2A and 2B are arranged inside thereof. 4 is a vertical beam of the slab 1, 5 is a driven post-installed anchor disposed on the slab 1, and 6 is a driven post-installed anchor disposed on the vertical beam 4. In the present invention, a concrete beam 2C is placed on the lower surface 1A of the slab 1 by backlashing in the direction perpendicular to the line using a suspension form (not shown), and a reinforcing beam having a shear reinforcing bar 2A and an axial reinforcing bar 2B. 3. At this time, the driven post-installed anchor 6 installed on the vertical beam 4 is connected to the axial rebar 2B of the reinforcing beam 3, and the driven post-installed anchor 5 of the slab 1 is connected to the shear reinforcing bar 2A of the reinforcing beam 3. The reinforcing bars 2A and 2B of the reinforcing beam 3 of the slab 1 are arranged in such a manner as to be joined. By comprising in this way, the joining of the shear reinforcement 2A and the axial reinforcement 2B as reinforcement of the reinforcing beam 3 of the slab 1 and the slab 1 and the longitudinal beam 4 is strengthened.

FIG. 3 is a schematic view of a main part showing a reinforcing method of a slab using cast-in-place concrete for constructing a steel sheet embedding formwork according to a second embodiment of the present invention, and FIG. FIG. 3B is a view as seen from the direction perpendicular to the line.
In this embodiment, the concrete beam 2C is placed and the reinforcing beam 3 of the slab 1 is installed, and then the steel plate embedded form 7 is placed on the bottom surface of the reinforcing beam 3 to reinforce the beam 3 of the slab 1. The reinforcement degree of itself is raised.

FIG. 4 is a schematic view of a main part showing a slab reinforcing method using cast-in-place concrete for constructing an ultrahigh-strength fiber concrete embedding form according to a third embodiment of the present invention. FIG. FIG. 4B is a diagram viewed from the direction perpendicular to the line.
In this embodiment, after the concrete 2C is cast and the reinforcing beam 3 of the slab 1 is installed, an ultrahigh-strength fiber concrete embedded form 8 is placed on the entire outer surface of the reinforcing beam 3 to provide a small reinforcing beam. The degree of reinforcement of the beam 3 itself is increased.

With this configuration, the reinforcing beam 3 of the slab 1 is firmly joined to the slab 1 and the longitudinal beam 4, and the reinforcing beam 3 of the slab 1 with increased rigidity is constructed. Can do.
Therefore, according to the present invention, the proof strength and rigidity of the existing RC rigid frame viaduct can be improved, and the reinforcing beam is installed on the belly of the slab that causes noise at the time of amplitude, so that vibration countermeasures are also taken. be able to.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The present invention reinforces a slab using cast-in-place concrete, which can make the connection between the slab and the slab and the slab and the beam robust by simple construction, improve the strength and rigidity of the existing RC ramen viaduct, and take measures against vibration. It can be used as a construction method.

DESCRIPTION OF SYMBOLS 1 Slab 1A Bottom surface of slab 2A Shear reinforcement 2B Axial reinforcement 2C Concrete 3 Reinforcement beam 4 Slab vertical beam 5 Post-installed anchor to slab 6 Post-installed anchor to vertical beam 7 Steel plate embedded form 8 Super high strength Fiber concrete embedded formwork

Claims (3)

(A) a reinforcing beam made of cast-in-place concrete installed in the direction perpendicular to the track on the lower surface of the slab;
(B) a post-construction anchor placed on the slab;
(C) After the construction anchor is placed on the beam of the slab,
(D) The reinforcing reinforcing beam is connected so that the axial reinforcing bar of the reinforcing beam is connected to a post-installed anchor disposed on the beam of the slab, and the shear reinforcing bar of the reinforcing beam is connected to the post-installed anchor of the slab. Reinforcement method for slabs using cast-in-place concrete, characterized by the placement of small beams.   2. The slab reinforcement method using cast-in-place concrete according to claim 1, wherein a steel plate embedded formwork is disposed on the bottom surface of the reinforcing beam.   The slab reinforcement method using cast-in-place concrete according to claim 1, wherein an ultrahigh-strength fiber concrete embedded formwork is disposed on the outer surface of the reinforcing beam. Construction method.