JP2608253B2 - Open channel installation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing an open channel on soft ground.

[0002]

2. Description of the Related Art Recently, open culverts, which are precast reinforced concrete products, are often installed on soft ground. It is common to support with piles. As a method of supporting the open channel with the concrete foundation pile, (1) the concrete at the head of the driven concrete foundation pile is scraped off to expose the reinforcing steel. (2) Connect the reinforcing bar of the head of the foundation pile to the reinforcing bar arranged so as to straddle the heads of the plurality of foundation piles, cast concrete, and construct a foundation plate on the head of the foundation pile. (3) Mortar is laid on the basic slab, the open channel is placed, and the two are integrated while adjusting the level. The method is exclusively adopted.

[0003]

According to the conventional method of installing an open channel on a concrete foundation pile, it is necessary to construct a double foundation layer again below an open channel bottom plate which is originally manufactured as a basic version. It is an uneconomical foundation structure and reduces the effectiveness of precast reinforced concrete products.

[0004]

SUMMARY OF THE INVENTION The present invention uses a semi-finished product that has not been completed up to the bottom slab as a precast reinforced concrete product, and integrates the culvert into the foundation pile head simultaneously with the completion of the bottom slab. By doing so, the purpose of the present invention is to eliminate the waste of the conventional method and to exhibit the original effect of precasting.

That is, according to the present invention, the head of a concrete foundation pile driven into the ground is scraped off to expose a reinforcing bar,
A semi-finished open channel with a non-concrete part on the bottom slab is placed on top of it, and the steel bar exposed from the foundation pile head is bent horizontally and connected with the reinforcing steel of the open channel bottom slab. This is a method of installing an open channel, characterized in that cast-in-place concrete is poured into the section to complete the open channel bottom slab while integrating the open channel with the foundation pile.

In the present invention, semi-finished culverts of various types of bottom slabs are used as described below, and are appropriately selected according to the condition of the ground, the driving density of the foundation pile, the construction environment and the like.

(1) Only reinforcement for reinforcing the bottom plate is provided, and concrete is not poured at all over the entire bottom plate.

(2) Reinforcing reinforcement for the bottom slab, and concrete is partially cast on the bottom slab.

(3) Reinforcing reinforcement for the bottom slab is performed, and concrete is not cast in the center of the bottom slab corresponding to the lower pile group head, and concrete is cast in the other peripheral portions. What you have.

(4) Reinforcing reinforcement for the bottom slab is performed, and concrete is not poured into a plurality of locations corresponding to the heads of a plurality of foundation piles below, and concrete is poured into other portions. What is being done.

(5) A reinforcing plate for reinforcing the bottom slab is interrupted at the place where the concrete is not placed due to the deformation of (3) or (4), and the end of the reinforcing bar projects horizontally to the place where the concrete is not placed.

The semi-completed open channel of the type (1) is of a general-purpose type, and can be applied to various types of already-constructed foundation piles. The semi-completed open channel of the form (2) is also a general-purpose type, and is partially
In particular, by placing concrete around the edge,
The center of gravity has been lowered to increase the stability of the semi-completed open channel during construction. Semi-completed open channel of (3)-(5) is (1), (2)
The degree of completion is larger than that of, and only the central part corresponding to the foundation pile group head or multiple places corresponding to individual foundation pile heads are unfinished, and precasting of open drainage is promoted as much as possible Therefore, the on-site work is to be reduced as much as possible. The format of (5) is (3), (4)
Is adopted when the connection between the foundation pile reinforcing bar and the bottom slab reinforcing bar is not properly accommodated. In the form of (5), instead of the reinforcing bar for reinforcing the bottom plate being interrupted at a plurality of places where the concrete has not been placed, the ends of the reinforcing bars are projected horizontally to the places where the concrete has not been placed, instead of mounting metal fittings (for example, nuts). May be buried in the bottom slab concrete, and a reinforcing bar may be attached to the mounting bracket and protruded.

Regardless of the semi-finished open channel of any bottom plate, the side wall of the open channel is completed as a reinforced concrete structure, and only the bottom plate is not completed.

In the present invention, first, the head of a concrete foundation pile driven into the ground is scraped off to expose the reinforcing bar. This operation is not particularly different from the conventional method.

Next, a semi-finished open channel of the above-mentioned type (1) to (4) having a concrete non-placed portion on the bottom slab is placed thereon, and the rebar exposed from the foundation pile head is horizontally placed. After being bent and connected with the reinforcing steel of the open channel bottom plate, cast-in-place concrete is poured into the semi-finished open channel unconcreted portion to integrate the open channel and the foundation pile to complete the open channel bottom plate. Therefore,
There is no need to construct a double base plate of the open bottom plate and the foundation plate on the foundation pile, and the efficiency of the connection between the open channel and the foundation pile is improved. Then, by selecting a semi-completed open channel with a degree of perfection according to the condition of the installation ground, it is possible to obtain an optimal work balance between factory production and on-site construction, thereby further improving efficiency.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which a side wall is made of reinforced concrete, and a bottom slab is a semi-finished open culvert in which only a predetermined reinforcing arrangement is made and no concrete is cast, and is placed on a foundation pile. Is a longitudinal sectional view, and (b) is a transverse sectional view.

The concrete at the head of the concrete foundation pile 1 that has been driven in is scraped off to expose the foundation pile reinforcement 2. On this, the side wall 3 is completed as a reinforced concrete construction, and as the bottom plate, a semi-finished open channel having only the bottom plate reinforcing bar 5 arranged thereon is placed. The foundation pile reinforcement 2 is bent horizontally and the bottom plate reinforcement 5
Connect to Concrete is poured into the concrete uncasted portion 6 of the bottom slab, and the culvert and the foundation pile 1 are integrated to complete the culvert bottom slab.

FIG. 2 shows an example in which the side walls are made of reinforced concrete, the bottom slab is provided with predetermined reinforcing bars, and a semi-finished open channel with good stability is placed on the foundation pile with concrete poured around the periphery. a) is a longitudinal sectional view, (b) is a transverse sectional view,
(C) is a cross-sectional view of another example.

In the examples shown in FIGS. 3A and 3B, a semi-finished open channel in which the center of the bottom slab 7 is not cast and the bottom slab reinforcing bar 5 is exposed and concrete is cast on the periphery is used as a foundation pile. 1. As in the case of FIG. 1, the foundation pile reinforcing bar 2 is bent horizontally and connected to the bottom slab reinforcing bar 5, and concrete is poured into the concrete uncasted portion 6 of the bottom slab to open the open channel and the foundation pile 1 integrally. Complete the culvert version.

(C) is an example in which the shape of the concrete casting portion of the bottom slab 7 is different from those of (a) and (b).

FIG. 3 shows that the side wall is made of reinforced concrete, the bottom slab is provided with a predetermined arrangement of reinforcing bars, and a semi-finished open channel manufactured by casting concrete while providing a plurality of uncast concrete portions is placed on a foundation pile. The example which mounted is shown, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view, (c) is a cross-sectional view of another example.

In the example shown in FIG. 3, the semi-finished open channel is set so that the area of the uncasted portion 6 of the bottom slab 7 is made as small as possible and only a plurality of portions corresponding to the head of the foundation pile 1 are uncasted portion 6. Is placed on the foundation pile 1.
In the examples shown in (a) and (b), since the bottom slab reinforcing bar 5 is exposed at the uncasted portion 6 of the concrete, the foundation pile reinforcing bar 2 is bent horizontally as in the case of the previous figure to form the bottom slab reinforcing bar 5. Concatenate,
Concrete is poured into the concrete uncasted portion 6 of the bottom slab, and the culvert and the foundation pile 1 are integrated to complete the culvert bottom slab.

In the example of (c), the bottom slab reinforcing bar 5 is interrupted at the concrete non-placed portion 6 and its end 8 only projects into the concrete non-placed portion 6, so that a new short reinforcing bar (see FIG. (Not shown) to connect the foundation pile reinforcing bar 2 and the end 8. After that, concrete is poured into the concrete non-placed portion 6 to integrate the open channel and the foundation pile 1 to complete the open channel bottom plate.

[0025]

According to the installation method of the present invention, the following effects can be obtained.

There is no need to construct a double base plate consisting of an open bottom plate and a base plate on a base pile, and the efficiency of the connection between the open channel and the base pile is improved. Then, by selecting a semi-completed open channel with a degree of perfection according to the condition of the installation ground, it is possible to obtain an optimal work balance between factory production and on-site construction, thereby further improving efficiency.

[Brief description of the drawings]

FIG. 1 shows an example in which a side wall is made of reinforced concrete, and a bottom slab is an example in which a semi-finished open channel where only concrete is laid and no concrete is cast is placed on a foundation pile. (B) is a cross-sectional view.

FIG. 2 shows an example in which a side wall is made of reinforced concrete, a predetermined slab is provided on a bottom slab, and a semi-finished open channel with good stability, in which concrete is cast on the periphery, is placed on a foundation pile.
(A) is a longitudinal sectional view, (b) is a transverse sectional view, and (c) is a transverse sectional view of another example.

FIG. 3 The side walls are made of reinforced concrete, the bottom slab is provided with a predetermined arrangement of reinforcing bars, and a stable semi-finished open channel manufactured by casting concrete while providing a plurality of uncasted portions is used as a foundation pile. The example mounted on the top is shown, (a) is a longitudinal sectional view, (b) is a transverse sectional view, and (c) is a transverse sectional view of another example.

[Explanation of symbols]

1 ・ ・ Foundation pile, 2 ・ ・ ・ ・ Reinforcement of foundation pile, 3 ・ ・ Side wall, 4 ・ ・
Side wall rebar, 5 ... bottom slab, 6 ... concrete unplaced part, 7 ... bottom slab, 8 ... bottom slab end.

Claims (6)

(57) [Claims] Claims 1. A concrete foundation pile driven into the ground is scraped off to expose a reinforcing bar, and a semi-finished open channel having a non-concrete part on a bottom slab is placed thereon. After bending the more exposed rebar horizontally and connecting it to the rebar of the open channel bottom slab, cast cast-in-place concrete in the non-concrete casting area and complete the open channel bottom slab while integrating the open channel with the foundation pile The installation method of the open channel characterized by doing. 2. The method according to claim 1, wherein the semi-finished open bottom plate is not cast over the entire surface. 3. The method according to claim 1, wherein the semi-finished open channel bottom plate is partially not cast in concrete. 4. The method according to claim 3, wherein the semi-finished open channel bottom slab has no concrete cast in the center portion and concrete is cast on the outer peripheral portion. 5. The semi-finished open channel bottom slab according to claim 3, wherein a plurality of locations corresponding to a plurality of foundation pile heads are not cast concrete, and the other portions are cast concrete. Installation method. 6. The bottom slab of the semi-finished open bottom slab not in the form where it penetrates in the horizontal direction, but in the form where the end buried in the already laid part projects horizontally in the unplaced place. The reinforcing bar is arranged, and the bottom slab reinforcing bar and the foundation pile reinforcing bar are connected to each other via the short reinforcing bar to be newly arranged.
How to install the open channel described.