JPH0971908A - Bridge pier structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bridge pier from collapsing, by surrounding the peripheral wall of a concrete bridge pier body with a reinforcing cylindrical body made of a steel plate and charging a specified adhesive in the annular space and bonding the reinforcing cylindrical body on the bridge pier body as a united form. SOLUTION: The peripheral wall of the bridge pier body 1 of a bridge pier 10 is surrounded by a reinforcing cylindrical body 2 made of a steel plate. An adhesive A chiefly made of a composite polymer emulsion is charged in the annular space between the bridge pier body 1 and the reinforcing cylindrical body 2 to bond the reinforcing cylindrical body 2 with the bridge pier body 1 as a united body. A main mixing material in which a composite polymer emulsion is added, is chiefly sand and mortar. The reinforcing cylindrical body 1 is the concrete reinforcing wall in which reinforcements are embedded. The horizontal anchor parts and the vertical anchor parts of the reinforcements are driven into the bridge pier body 1 through the adhesive A. Accordingly, the bridge pier can be provided with flexibility and toughness and hence large forces can be absorbed and the collapse of bridge pier can be prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pier structure.

[0002]

2. Description of the Related Art Conventionally, for concrete piers,
In some cases, reinforced steel plates and reinforced concrete were integrated into the pier body to reinforce it to improve earthquake resistance.

In this structure, the peripheral wall of the pier main body is surrounded by a reinforcing steel plate or reinforced concrete, and the reinforcing steel plate or reinforced concrete is integrally adhered to the peripheral wall of the pier main body by an epoxy resin having high strength as an adhesive. Target.

[0004]

However, it has been found that the conventional reinforcement described above does not have sufficient seismic resistance for concrete bridge piers.

It is considered that the most important factor is the fundamental defect that the epoxy resin cannot follow the deformation of concrete, reinforced steel plate, etc. when a large force is applied due to an earthquake or the like.

Further, the epoxy resin has a property of being peeled off by water, which is also a factor that hinders the integration of the pier body and the reinforcing material.

Furthermore, when the reinforcing material is concrete,
Since it is necessary to assemble a formwork, it takes time, and during that time, there is a problem in construction that the effect as an adhesive is weakened.

In recent years, the defects of the conventional bridge pier structure in which only the above-mentioned strength is pursued have been pointed out, and there is an urgent need to establish new measures against earthquakes.

Therefore, in order to impart flexibility and toughness to the bridge pier so that the force can be distributed, for example,
Measures such as increasing the stirrup are being considered.

However, if the main rebar and the stirrups become too fine, there is a new problem that the aggregate may be caught midway when concrete is struck and a cavity may be formed below it. .

An object of the present invention is to provide a pier structure that can solve the above problems.

[0012]

According to the present invention, a peripheral wall of a concrete pier main body is surrounded by a reinforcing cylinder made of a steel plate, and an annular space between the peripheral wall of the pier main body and the reinforcing cylinder is provided.
The present invention relates to a pier structure characterized in that a reinforcing polymer is integrally bonded to a pier body by filling an adhesive produced by mixing a composite polymer emulsion with a main component.

The present invention is also characterized by the following configurations.

(A) A peripheral wall of a concrete pier main body is surrounded by a concrete reinforcing wall in which reinforcing reinforcing bars are embedded,
The concrete reinforcing wall is integrally bonded to the peripheral wall of the pier main body with an adhesive produced by mixing the composite polymer emulsion with the main agent, and the anchor portion of the reinforcing bar is
The composite polymer emulsion is mixed into the main body of the pier via an adhesive produced by mixing the base polymer.

(B) The peripheral wall of the concrete pier main body was manufactured by mixing the composite polymer emulsion with the main component and was covered with a reinforcing lining layer having reinforcing bars embedded therein.

(C) The reinforcing reinforcing bar is formed of a plurality of long main bars and a spiral band wound around the main bars.

(D) A peripheral wall of a concrete pier main body was covered with an elastic lining layer produced by mixing concrete or mortar with a composite polymer emulsion.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings from the first to fifth embodiments.

(First Embodiment) The pier structure according to the present embodiment is a steel plate winding structure in which a reinforcing cylinder made of a steel plate is integrally bonded to an existing concrete pier main body.

That is, in FIG. 1, 10 is a pier,
In the pier 10, the peripheral wall of the existing pier main body 1 is surrounded by a reinforcing cylinder 2 made of a steel plate, and the peripheral wall of the pier main body 1 and the reinforcing cylinder 2 are surrounded.
The annular space between and is filled with the adhesive A, and the reinforcing cylinder 2 is integrally bonded to the pier main body 1.

The above-mentioned adhesive A is produced by mixing the composite polymer emulsion with the main agent, has a strong adhesive force, and securely adheres the reinforcing cylinder 2 made of steel plate to the concrete pier main body 1. Can be integrated.

Moreover, since it has elasticity, it has the characteristic that it can follow the deformation of concrete or steel plate when it receives a large force such as an earthquake.

Therefore, flexibility and toughness can be imparted to the pier 10. For example, when a force is applied to the pier 10,
Up to a certain force, it elastically deforms to prevent cracking, and if a larger force is applied, it shifts to plastic deformation, but since it has high toughness, as shown in Fig. 2, the proof stress does not fall below a certain value. It can be taken large, can absorb a larger force, and can prevent the pier 10 from collapsing.

Here, the adhesive A produced by mixing the composite polymer emulsion with the main component will be specifically described.

The complex polymer emulsion is, for example,
There are those disclosed in JP-A-58-149961 and JP-A-60-2386503, which have the following component constitutions.

[0026] Further, as the main agent with which the above-mentioned composite polymer emulsion is mixed, specifically, sand and mortar are mainly used, and it has the following constitution.

[0027] The mixing ratio of the composite polymer emulsion and the main agent is preferably 1: 3-10.

Further, the adhesive A is also effective as a rust preventive agent, and therefore, in this embodiment, the composite polymer emulsion is mixed with the main component on the surface of the reinforcing cylinder 2 made of a steel plate. Adhesive A is applied as a surface coating agent to reliably prevent corrosion of the reinforcing cylinder 2 made of a steel plate.

In order to enhance the rust prevention effect, part or all of the silica sand in the main component may be replaced with a ceramic powder resistant to corrosion. Further, the adhesive A is well compatible with pigments and can be freely colored, and in order to enhance the appearance,
A pigment can be added to the adhesive A, or a paint can be applied on the adhesive A.

In this way, the concrete pier main body 1
The peripheral wall of is surrounded by a reinforcing cylinder 2 made of a steel plate, and the annular space between the peripheral wall of the pier main body 1 and the reinforcing cylinder 2 is filled with an adhesive A produced by mixing a composite polymer emulsion with a main agent. Then, the reinforcing cylinder 2 is integrally bonded to the pier body 1,
Flexibility and toughness are added to the pier 10 to prevent the force applied by a large earthquake or the like from cracking to collapse.

Further, the adhesive according to the present invention is a carboxy-modified styrene butadiene, cyclohexyl methacrylate, methanol, fatty acid soda soap, a composite polymer emulsion containing water as a constituent, white cement, silica sand,
Manufactured by mixing with iron powder, zinc white, and titanium white as the main components, which are excellent in elasticity, adhesiveness, waterproofness, and rust resistance, and follow the deformation of concrete, rebar, etc. Therefore, it can be suitably used for seismic reinforcement of the pier 10.

(Second Embodiment) Here, a concrete winding structure is constructed by integrally adhering a concrete reinforcing wall to an existing concrete pier main body with an adhesive.

That is, as shown in FIG. 3, the peripheral wall of the existing concrete pier main body 1 is surrounded by the concrete reinforcing wall 5 in which the reinforcing bars 4 are embedded, and the concrete reinforcing wall 5 is attached to the peripheral wall of the pier main body 1. A structure in which the horizontal anchor portion 41 and the vertical anchor portion 42 of the reinforcing bar 4 are driven into the pier main body 1 via the adhesive A while being integrally bonded with the adhesive A described in the first embodiment. It is what

The reinforcing bar 4 is also preliminarily coated with the adhesive A and embedded in the concrete reinforcing wall 5 to prevent corrosion of the reinforcing bar 4 and to improve the adhesion performance between the reinforcing bar 4 and concrete. It also improves tensile strength and bending strength.

Further, the horizontal anchor portion 41 is driven horizontally in the middle of the leg portion of the pier main body 1, and the vertical anchor portion 42 is driven vertically to the base portion 1a of the pier main body 1 through the adhesive A. There is.

Since the anchors 41, 42 are firmly fixed by the strong adhesive force of the adhesive A, the concrete reinforcing wall 5 is surely integrated with the pier main body 1, and the adhesive A is elastic. Therefore, when a large force such as an earthquake is applied, the deformation of concrete or steel plate can be followed, and the pier 10 can be provided with flexibility and toughness. Therefore, it is possible to prevent the pier 10 from cracking or collapsing without increasing the amount of the reinforcing bars 4 significantly.

(Third Embodiment) The one shown in FIG. 4 is a reinforcing lining in which a peripheral wall of a concrete pier main body 1 is manufactured by mixing a composite polymer emulsion with a main agent, and reinforcing reinforcing bars 6 are embedded therein. The thickened reinforcing structure is covered with the layer B. Reference numeral 61 is a plurality of long main bars, and 62 is a ring-shaped bar that is attached in the longitudinal direction of the main bars 61 at regular intervals.

That is, the reinforcing lining layer B is obtained by embedding the reinforcing reinforcing bar 6 in the adhesive A described in the first and second embodiments. The reinforcing lining layer B may be mixed with reinforcing fibers such as carbon fibers, glass fibers and aramid resin fibers to increase the strength.

Unlike the concrete hoisting structure as in the second embodiment, the present embodiment does not require a frame to be assembled, so that the work can be carried out quickly without any trouble and the pier body 1
The surrounding thickness is much smaller, the increase in dead load is reduced, the footing of the foundation 1a is not expanded, and naturally, the additional piles 20 required in the expanded part are not necessary, so that efficient seismic reinforcement is achieved.

(Fourth Embodiment) As a fourth embodiment, FIG.
What is shown in (a) and (b) will be described.

This is one in which the reinforcing bar 6 in the third embodiment is formed from a plurality of long main bars 6a and a spiral band 6b wound around the main bars 6a. 5 (a) is
This is applied to the column-shaped pier body 1 and FIG. 5B shows the case applied to the prism-shaped pier body 1.

As described above, in the case where the piers 6b are formed in a spiral shape, the toughness is improved because the continuity of the reinforcing bar 6 is increased regardless of whether the pier main body 1 is cylindrical or prismatic. Ten
It can increase its strength against buckling and crushing.

(Fifth Embodiment) FIG. 6 shows a pier structure as a fifth embodiment.

This is an elastic lining layer C produced by mixing the peripheral wall of the existing concrete pier body 1 with concrete or mortar mixed with a composite polymer emulsion.
It has an elastic concrete winding structure covered with.

The elastic lining layer C may be a mixture of the main component with the composite polymer emulsion shown in the first embodiment, but in the present embodiment, an aggregate such as gravel is added to the main component.

The elastic lining layer C has a low water permeability, so that the lining layer C will not be peeled off due to water entering the pier body 1 due to rain or the like.

Further, as described in the first to fourth embodiments, since the flexibility and toughness are high, the restoring force is large, cracks and the like can be surely prevented, and a large force due to an earthquake or the like is generated. Even if added, it can prevent the pier 10 from collapsing, which is suitable for seismic reinforcement. Moreover, the reinforcing bar can be eliminated.

Further, the elastic lining layer C is characterized in that it is particularly resistant to rolling compared to ordinary concrete.

By the way, in each of the above-mentioned embodiments, the bridge pier structure of the present invention has a structure in which the existing tubular pier main body 1 is bonded to the reinforcing tubular body 2 made of steel plate and the concrete reinforcing wall 5 in which reinforcing reinforcing bars are embedded, and the inside is reinforced. The structure in which the reinforcing lining layer B in which the reinforcing bars are embedded and the elastic lining layer are covered has been described. Once built, it has flexibility and toughness,
It is possible to construct a bridge pier 10 with high earthquake resistance, and no reinforcement is required.

[0050]

As described above, according to the present invention,
Since the reinforcing cylinder made of steel plate and the concrete reinforcing wall are strongly adhered to the peripheral wall of the pier main body through the adhesive produced by mixing the composite polymer emulsion with the main agent, it is possible to add flexibility and toughness to the pier. Since it is possible to follow the deformation of concrete or steel plate, for example, when a force is applied to the pier, it will elastically deform up to a certain force to prevent cracks, and if a larger force is applied, it will be plastically deformed. Although it shifts, since the toughness is high, it is possible to take large deformation without lowering the yield strength below a certain value, absorb a larger force, and prevent collapse of the pier.

Further, if the peripheral wall of the pier main body is covered with a reinforcing lining material prepared by mixing the composite polymer emulsion with the main component, the workability is improved because it is not necessary to form a concrete formwork, and the amount of reinforcing bars is increased. Even if there is little, it is possible to obtain sufficient seismic resistance. Moreover, there is no restriction due to the shape.

Further, if the reinforcing reinforcing bar is formed from a plurality of long main bars and a spiral band around the main bars,
Since the continuity is improved, the toughness is improved, and the strength of the pier itself against buckling and crushing can be increased.

Further, by covering the peripheral wall of the pier main body with the elastic running material produced by mixing the composite polymer emulsion with concrete or mortar, the reinforcing bar can be eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a pier structure according to a first embodiment.

FIG. 2 is a graph showing the proof stress of the pier structure according to the present invention.

FIG. 3 is an explanatory view showing a pier structure according to a second embodiment.

FIG. 4 is an explanatory view showing a pier structure according to a third embodiment.

FIG. 5 is an explanatory view showing a pier structure according to a fourth embodiment.

FIG. 6 is an explanatory view showing a pier structure according to a fifth embodiment.

[Explanation of symbols] 1 Pier main body 2 Reinforcement cylinder 4 Reinforcement bar 5 Concrete reinforcement wall 6 Reinforcement bar 6a Main bar 6b Belt bar 10 Bridge pier A Adhesive

Claims (5)

[Claims] 1. A pier main body (1) made of concrete is surrounded by a reinforcing cylinder (2) made of a steel plate.
An adhesive produced by mixing the composite polymer emulsion with the main component in the annular space between the peripheral wall of (1) and the reinforcing cylinder (2).
A pier structure characterized by being filled with (A) and integrally adhering a reinforcing cylinder (2) to the pier body (1). 2. A peripheral wall of a concrete pier main body (1) is surrounded by a concrete reinforcing wall (5) in which reinforcing reinforcing bars (4) are embedded, and the concrete reinforcing wall (5) is surrounded by a peripheral wall of the pier main body (1). In addition to adhering together with the adhesive (A) produced by mixing the composite polymer emulsion with the main agent, the anchor parts (41) and (42) of the reinforcing bar (4) are placed in the pier body (1). A pier structure characterized by being driven through an adhesive (A) prepared by mixing a composite polymer emulsion with the main component. 3. A peripheral wall of a concrete pier main body (1) is manufactured by mixing a composite polymer emulsion with a main agent and is covered with a reinforcing lining layer (B) in which reinforcing reinforcing bars (6) are embedded. Pier structure characterized by. 4. The reinforcing bar (6) is provided with a plurality of long main bars.
The pier structure according to claim 3, wherein the pier structure is formed from (6a) and a spiral strip (6b) wound around the main bar (6a). 5. A pier structure, characterized in that the peripheral wall of a concrete pier body (1) is covered with an elastic lining layer (C) produced by mixing concrete or mortar with a composite polymer emulsion.