JPH0874271A - Method of work execution for foundation - Google Patents

Abstract

PURPOSE: To improve the working efficiency and enhance the accuracy in work execution and shorten the term of works by manufacturing foundation members required for construction of foundation concentrically at one place within the site on which to build the foundation. CONSTITUTION: After foundation work, the position of installation of foundation member is set out, and PC independent foundation posts 1 are installed in the specified positions out of the PC(precast concrete) foundation members being manufactured on the manufacture yard of the precast member within the site, and a PC foundation beam 2 whose ends are cut is arranged between adjacent foundation posts. The foundation posts 1 and the foundation posts 2 are joined with each other through pillar rods a2 and b projected from the opposed faces and reinforcing rods, and a thin PC molding box 3 is set up for the foundation beam 2, and then concrete for joining is laid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for a building foundation.

[0002]

2. Description of the Related Art Conventionally, the foundation of a building is constructed by pile work supporting the building, and after the earthwork such as excavation, an independent foundation and a foundation beam are constructed. After that,
Through the steps of prefabricated rebar assembly, formwork assembly, concrete placement, formwork dismantling, etc., the overfilled part is backfilled and the construction is completed.

In addition to the above steps, a part of the foundation beam is manufactured as a precast concrete (hereinafter referred to as PC) member, the member is attached between the independent foundations, and the independent foundation is constructed by the above-mentioned conventional method. There is a construction method that is integrated with.

[0004]

However, according to the above-mentioned conventional method, since the pre-processed rebar is conveyed to the place where the independent foundation and the foundation pile are constructed and assembled, the scaffolding required for the assembly work is erected, In the case of assembling work by arranging individual reinforcing bars at predetermined positions, there is a problem that the surrounding work space is narrow, and the feet are bad and the work cannot be done efficiently and the efficiency cannot be improved.

Further, the process of assembling and disassembling the formwork in accordance with the shapes of the independent foundation and the foundation pillar is a complicated work,
Moreover, specialized formworkers are required, which causes a shortage of labor and a shortage of labor, which adversely affects the progress of construction. The present invention has been proposed in view of the above problems of the prior art, and the object thereof is to intensively manufacture the base member required for the foundation construction in one place in the building to improve the working condition. However, it is to provide a basic construction method that improves workability, saves labor, improves construction accuracy, and shortens the construction period.

[0006]

In order to achieve the above-mentioned object, according to the foundation construction method of the present invention, a pile is driven into a predetermined support layer and a predetermined foundation ground is excavated to perform the ground work. After the construction work, mark the foundation member installation position, and make the precast concrete independent foundation pillars at the prescribed position among the precast concrete foundation members manufactured in the yard of the precast concrete foundation member that was installed at the prescribed position in the site. In addition, the precast concrete foundation beam with both ends partially cut off is arranged between the precast concrete independent foundation columns installed at the predetermined positions, and the independent foundation column and the precast concrete foundation beam are the same. Reinforcing bars projecting from the beam cutouts and the reinforcing bars projecting from the independent foundation are joined together to assemble the formwork on the foundation beams to join the joint concrete. It is intended to bonding the independent foundation pillar and foundation beams and set.

[0007]

According to the present invention, as described above, a pile for supporting a building is driven into a predetermined support layer, a predetermined foundation ground is excavated to perform geotechnical work, and after earthwork such as excavation. , The base member installation position is marked out, and among the PC members manufactured in advance in the site, the PC independent foundation pillars are installed, and the PC foundation beams with both ends partially cut away are separated from the adjacent independent foundation pillars. Installed in between, the gaps between the foundation beams and the PC independent foundation columns are joined together through the reinforcing bars protruding from both members, and the formwork is assembled on the side faces of the foundation beams to join the joint concrete. The independent foundation pillar and the foundation beam are joined by driving.

[0008]

The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 and 2, reference numeral 1 denotes a PC independent foundation pillar, which is arranged at an intersection of XY axes orthogonal to each other in a grid pattern, and a PC foundation beam 2 with both ends cut away is arranged between adjacent independent foundation pillars 1. Has been done.

[0009] The PC independently foundation pillar 1 and fixing muscles a ₂ beams muscle underlying pillar muscle a ₁ and PC footing beams 2, as shown in FIG. 3 is Haisuji, protrude the respective fixing length min rebar There is. As shown in FIG. 4, a part of both ends of the PC foundation beam 2 is cut off to form a joint, and a part of the beam bar b is projected on the cutout. The PC independent foundation pillar 1 and the PC foundation beam 2 are manufactured by assembling the reinforcing bars, assembling the formwork and placing concrete in the production yard at the construction site. In the same manner, the thin-walled PC form 3 manufactured in the manufacturing yard is shown in FIG. 5 as in the case of the pillar 1 and the beam 2 and manufactured in the manufacturing yard on the premises.

Next, the process of the present invention will be described with reference to the construction flow diagram of FIG. 6 and the process diagrams of FIGS. 7 to 10. First, concrete is poured while mixing large-sized coarse aggregates such as split chestnuts and cobblestones, and rubbable concrete (kuriishi concrete) N is created on the ground of the PC independent foundation pillar 1, and the PC independent foundation pillar 1
And excavate the ground G so that the PC foundation beam is installed. M
Is the excavated ground.

Next, split chestnut work is carried out, and waste concrete R
After placing the concrete on the concrete R and waiting for it to harden, the positions of the foundation columns and foundation beams are marked out. H is a worker who is in the process of being marked. (See FIG. 7) At this time, at the installation position of the PC independent foundation pillar 1, the adjustment bolt 4 for determining the level of the foundation pillar 1 is discarded and the concrete R
It is buried above and the level of the foundation pillar 1 is decided.

Next, the PC independent foundation pillar 1 manufactured on the construction site is transported to the vicinity of a predetermined installation position by a towing truck towed by a driving vehicle as in the case of the PC foundation beam 2 described later, and the lifting machine is lifted. Suspend by F and install in place. (Refer to FIG. 8) Then, the PC foundation beam 2 manufactured in the construction site in the same manner as described above is conveyed to the vicinity of the installation position by the towing carriage S pulled by the drive vehicle T, and is lifted by the lifting machine F to be adjacent to each other. It will be installed between the PC foundation pillars 1. (See FIG. 9) Next, the PC independent foundation pillar 1 and the PC with both ends partially cut off
The foundation beam 2 is joined to the foundation beam projecting from the opposing surfaces of the foundation beam ₂ by fixing the beam reinforcements a ₂ and the beam reinforcement b of the foundation beam to the ribs, and the PC is cut out.
The side surface of the foundation beam 2 is closed with a thin-walled PC form 3 shown in FIG.
By placing the joint concrete 5, the PC
The foundation is constructed by joining the independent foundation pillar 1 and the PC foundation beam 2. In the figure, K is a worker. (Refer to FIG. 10) As shown in FIG. 11, the level adjustment of the PC foundation column 1 is performed by fixing the insert 6 on the rubbable concrete N and driving the waste concrete R, and then adjusting bolts 4 on the insert 6. Measure the level by screwing, align the tops of the bolts 4 horizontally, and immediately before installing the PC independent foundation columns 1, slightly raise the tops of the bolts 4 and spread the mortar U to evenly spread the PC independent foundation columns. Install 1.

Thus, the foundation of the building is excavated from the ground, and then the waste concrete R is placed to mark it and the adjusting bolt 4
The PC independent foundation pillar 1 is installed by adjusting the level, and the PC foundation beam 2 with a part of both ends cut off is installed between the PC independent foundation pillar 1 and the pillar beam is provided at the missing portion of the beam 2. By joining with the more protruding reinforcing bars a ₂ and b and placing the joint concrete 5, almost no manual work is required at the construction site when constructing the foundation, labor saving is achieved, and safe and quick work is achieved. Done.

[0014]

As described above, according to the present invention, a PC member manufacturing yard is installed at a predetermined position on a construction site, and a reinforcing bar processing machine and a conveyor required for manufacturing the PC member installed in the yard are installed. The required PC foundation member is manufactured on-site by the machine and the PC member manufacturing frame, and is transported to the stockyard. When necessary, the transportation means appropriately conveys it to the vicinity of the place where the PC foundation member is installed, and lifts heavy equipment. Since it was constructed so that it could be hung up and installed at the required location, and the PC base member could be joined and assembled, the PC base member could be used compared to the conventional work at a place where the feet are unstable and in a narrow space. As a result, on-site work is almost eliminated, labor is greatly saved, work safety is improved, and the construction period is shortened.

Among the basic members manufactured in the PC member manufacturing yard, the PC independent foundation pillars are installed at predetermined positions, and the PC independent beams with both ends partially cut away are used as the PC independent foundations. Arranged between pillars, and the PC foundation pillar and PC
The PC foundation columns and beams are simply and surely joined by joining them through the reinforcing bars protruding from the foundation columns, assembling the formwork to the foundation beams and placing the joining concrete to construct the foundation. It is possible to improve workability, save labor, and shorten the construction period.

[Brief description of drawings]

FIG. 1 is a partial plan view of a foundation constructed by the method of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a perspective view of a PC independent foundation pillar.

FIG. 4 is a perspective view of a PC foundation beam.

FIG. 5 is a perspective view of a thin PC mold.

FIG. 6 is a flowchart of a basic construction process.

FIG. 7 is a perspective view showing a process of excavating and marking out a base portion.

FIG. 8 is a perspective view showing an installation situation of a PC independent foundation pillar.

FIG. 9 is a perspective view showing a transportation and lifting state of a PC foundation beam.

FIG. 10 is a perspective view showing a joined state of a PC independent foundation column and a PC foundation beam.

FIG. 11 is an enlarged sectional view of an essential part of a level adjusting bolt portion of a PC independent foundation pillar.

[Explanation of symbols]

1 PC independent foundation pillar 2 PC foundation beam 3 Thin-walled PC form 4 Adjustment bolt 4a Adjustment bolt head 5 Joined concrete 6 Insert a ₁ Foundation pillar reinforcement a ₂ Foundation beam anchorage b Beam reinforcement F Lifting machine G Ground K Worker M Excavation Ground N Rubbable Concrete R Waste Concrete S Traction Truck T Drive Vehicle U Floor Mortar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimihiro Yamamoto 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd.

Claims (1)

[Claims] 1. A pile is driven into a predetermined support layer, a predetermined foundation ground is excavated to perform earthwork work, and then a foundation member installation position is marked out and installed at a predetermined position in the site. Of precast concrete foundation members manufactured in the yard of precast members, precast concrete independent foundation columns are installed at predetermined positions, and precast concrete foundation beams with both ends partially cut are installed at the predetermined positions. Arranged between the precast concrete independent foundation columns, the independent foundation columns and the precast concrete foundation beams, the reinforcing bars projected in the beam cutouts,
Of the foundation characterized by joining through the reinforcing bars protruding from the independent foundation, assembling the formwork to the foundation beam, and placing the joining concrete to join the independent foundation pillar and the foundation beam Construction method.