JPH03197702A - Reinforcing and laying method for concrete body - Google Patents

Abstract

PURPOSE:To make concrete bodies relieved of load with increased structural strength and to save labor for laying of the same by arranging reinforcing bars in a leveling aggregates layer that is provided between the precast concrete bodies and a foundation, and by making the above-mentioned three members integral with reinforcement. CONSTITUTION:Concrete bodies 1 are laid over a leveling aggregates layer 4 that is provided over a foundation 2, and reinforcing bars 5 are continuously arranged in the aggregates layer so that the bars traverse joints 3 of the concrete bodies. The leveling aggregates layer 4 and joints 3 between adjoining concrete bodies are filled with a filling material 7 that is injected through injection ports 6 optionally provided to the concrete bodies 1 and the joints 3 of the concrete bodies 1, and thereby an intermediate layer 8 is formed. The concrete bodies 1 and the intermediate layer 8 are united into an integral structure with adherent strength of the filling material 7. Thereby, load applied to the foundation 2 through the joints 3 can be uniformly dissipated and continuously lightened, enabling the concrete bodies to maintain stabilized bearing capacity for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention can strengthen and improve durability when constructing various types of foundations, bank protection, retaining walls, road pavement, etc. using the precast concrete construction method.

(Problems with the prior art) Conventionally, the method of laying precast concrete bodies was to construct unreinforced or reinforced precast concrete bodies or prestressed concrete precast concrete bodies (hereinafter collectively referred to as concrete bodies) manufactured in a factory and cured for a predetermined number of days. The method used was to bring the materials (called ``concrete'') to the site, lay them out on the leveled foundation surface, and inject injection material into the gap between the bottom surface of the concrete body and the foundation surface, and into the joints of the concrete body. At this time, in order to join the concrete bodies to form a continuous body, it was necessary to integrate the joints with reinforcing bars, and methods such as horn joints and horizontal joints were used as methods for this. However, the current situation is that such work not only requires work to align the reinforcing bar penetration positions, but also requires time and effort to inject grout material in order to fix the reinforcing bars.

In addition, by spreading the leveling aggregate between the concrete body and the foundation to create a continuous gap, the injection material can easily penetrate into the gap between the leveling aggregate layer and strengthen the area from the concrete body to the foundation. An integrated method has also been proposed, but in order to improve the load-bearing capacity against increased traffic volume, it is necessary to make the concrete body into a continuous body using the joint method described above, and the same problem arises. had.

(Means for Solving the Problems) The present invention aims to further strengthen the structure of a concrete body laying method in which a leveling aggregate layer is provided at the bottom of the concrete body and cement milk is injected. This is an improvement.

The details of the present invention will be explained using the drawings.

As shown in FIGS. 1 and 2, continuous reinforcing bars 5 are placed across the joint 3 within the leveling aggregate layer 4 provided on the base 2, and the concrete body 1 is installed on top of the reinforcing bars 5. After that, injection material 7 is injected and filled into the gap between the leveling aggregate layer 4 and the joint part 3 through the injection hole 6 appropriately provided in the concrete body 1 and the joint part 3 of the concrete body 1 to form an intermediate layer 8. A method of reinforcing and laying a concrete body by integrating the concrete body 1 and the intermediate layer 8 by the adhesive force of the material 7.

The reinforcing bars used for reinforcement in the present invention may be any round steel, deformed steel bars, etc. used in ordinary reinforced concrete structures. As the leveling aggregate used for the intermediate layer, crushed road stones No. 5 and No. 6, gravel, etc. are used. Further, cement milk can be made of cement and water, cement, water and chemical admixtures for cement, or these together with fine sand, fine aggregate, cement admixtures, and the like.

(Example) Next, an example of the present invention will be described. First, using the existing asphalt pavement as a base, No. 5 road grade crushed stone was spread on it to a thickness of 2 to 3 cm, and on top of that, round steel with a diameter of 12 mm was placed on a grid at 10 cm intervals, and then Spread 2 to 3 cm of No. 5 crushed stone and place the top surface 6 cm from the base surface.
It is leveled to a certain extent and made into a crushed stone layer.

Furthermore, the concrete bodies shown in Table 1 were laid out on top of the concrete bodies, the heights of the joint parts were made equal by applying vibration to the concrete bodies, and the construction thickness was set to 10 cm, and the cement milk shown in Table 2 was spread on the concrete bodies. It was injected into the crushed stone layer and joints through the injection holes provided, and was integrated with the concrete body.

On the other hand, the concrete body for comparison was installed directly on the foundation.
The gap with the base was filled with the same cement milk as in the present invention. However, the concrete body used was a double reinforced concrete structure with a thickness of 10 cm, which was equivalent to the construction thickness of the present invention.

After the above pavement construction and curing, the maximum deflection near the joint was measured with a wheel load of 5 tons, and the deflection for the method of the present invention was 0.35 mm, and for the comparative method was 1.15 mm. It was found that the amount of deflection of the structure using the above method was significantly smaller. Therefore, it can be said that the structural strength of the method of the present invention is significantly superior to that of the comparative method.

(Effects of the present invention) According to the present invention, the concrete body can be made into a more integrated continuous structure than before due to the reinforcing bars placed in the intermediate layer, and as a result, the drawbacks of the conventional precast concrete method Since the load acting on the foundation at the joint of the concrete body can be evenly and continuously widely distributed and alleviated within the foundation, the reinforcement of the foundation and the reinforcement of the joint can be reduced. Moreover, the desired effect can be achieved simply by placing the reinforcement reinforcing bars in the leveling aggregate when leveling the aggregate, making it possible to achieve the desired effect by simply placing the reinforcing bars in the leveling aggregate when leveling the aggregate. The required labor, time, etc. can be greatly reduced.

When conventional methods are applied to areas where the load-bearing capacity of the foundation is weak, especially when loads are applied to joints between concrete bodies, intermittent loading occurs before and after the joints, resulting in stress concentration within the foundation. This causes uneven settlement before and after the joint, resulting in a level difference at the joint of the concrete body, which not only impairs the running performance of road pavements, but also reduces the durability of the pavement. This will result in a decline. According to the present invention, since the intermediate layer can have a continuous structure, load propagation at the joints of the concrete body is performed continuously, so that stable load-bearing capacity can be maintained over a long period of time.

Furthermore, since the intermediate layer and the concrete body have an integral structure, a structure with higher structural strength can be achieved. In addition, it is possible to reduce the cross-sectional shape of the concrete body in order to obtain a structure with the same strength, which has many advantages such as reducing the size of the concrete body and saving labor during laying.

In addition, since the upper surface is a precast hardened body, if a rapidly setting material is used as the injection material for the intermediate layer, it can be put into use within a short period of time after construction.

[Brief explanation of drawings]

The drawings show an embodiment of the method for reinforcing concrete bodies according to the present invention, with FIG. 1 being a side view and FIG. 2 being a plan view. 1. Concrete body, 211. basis,
3. Seam, 4. Aggregate for leveling, 5. Reinforcing bar, 693. Injection hole, 7
, , , Injection material 8 , , Intermediate layer (continued on next page)

Claims (1)

[Claims] In a concrete construction method in which a leveling aggregate layer is provided between the precast concrete body and the foundation and injection material is injected, reinforcing reinforcing bars are placed in the leveling aggregate layer, so that the leveling aggregate layer is injected. A method for reinforcing and laying a precast concrete body, characterized by reinforcing the layers and creating a structure that is also integrated with the precast concrete body.