JP2013112936A - Structure with rigid frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a construction cost as well as a construction period to be reduced, in a structure with a rigid frame supported by pile foundations, in a manner that omits a foundation beam in a central portion of a span by allowing slab concrete positioned in the central portion of the span of the rigid frame to substitute a function of the foundation beam and thereby reducing: an excavation volume to construct the foundation beam to secure a degree of fixation at a column base section; and material costs for reinforcement as well as concrete of the foundation beam.SOLUTION: In a structure which has a rigid frame 1 supported by pile foundations 3 and slab concrete 2, a degree of fixation at column base sections is secured and a foundation beam at a central portion of a span is omitted by: installing edge portion reinforcement sections 4 with shapes of the foundation beams at edge portions of the slab concrete in the column base sections at both ends of the rigid structure; and allowing the slab concrete to substitute a function of the foundation beam in the central portion of the span of the rigid frame.

Description

The present invention relates to a structure having a rigid frame supported by a pile foundation, and specifically, a large span in which column base portions at both ends of the rigid frame are each supported by a single foundation pile in the span direction,
The present invention relates to a cost reduction technique for a large-scale structure having a high-rise / high-rise frame and soil concrete.

For example, in a large span and high floor ramen frame with a span of 30m or more and a floor height of 20m or more, if the column base is pin-supported, both the bending moment and deformation amount will increase, and the number of structural materials at the top of the frame will increase Therefore, in order to ensure the rigidity of the layer, it is particularly important to secure the degree of fixing of the ramen column base.

The following three methods are usually adopted as methods for securing the degree of fixation of the ramen column base.
As shown in FIG. 7 (A), the first method is to provide a foundation beam 9 between the column bases at both ends of the rigid frame, and the column base bending moment and shear force due to the horizontal force Q acting on the rigid frame. Is to be borne by the foundation beam 9.
As shown in FIG. 7 (B), the second method is a plurality of foundation piles 3 spaced apart in the span direction.
, 3 is installed, and the fixedness of the column base is secured by the rotational resistance by pushing and pulling these foundation piles 3, 3.
As shown in FIG. 7C, the third method is to provide a large base 10 that supports the column base, and to secure the fixing degree of the column base by the rotation resistance of the base 10.

However, in the first method, since the foundation beam 9 having a high beam is constructed, the amount of excavation of the ground is increased, and the material cost and construction work of the foundation beam 9 are increased. It is an economy. In particular, the span is 30 as in an automatic warehouse equipped with multi-stage high-rise shelves that automate the loading and unloading work by linking transport equipment such as lifts, cranes, and conveyors with computers.
Necessary when there is a large span structure with a high span and a high floor height such as 20 m or more and a floor height of 20 m or more, and this ramen frame is a large-scale structure arranged at a predetermined interval in the direction of beam. Despite the fact that a solid earthen concrete that can support the load capacity (reinforced concrete floor slab that does not need to support itself in the air because its weight is stored in the ground) is built on the entire building surface. The construction of a large number of reinforced concrete foundation beams 9 with long and high beams on the lower surface at a predetermined pitch in the direction of girder not only causes a significant increase in earthwork, but also increases the amount of rebar and concrete used. It is extremely uneconomical.

In the second method, if only the original vertical support force is required, one foundation pile 3 is required for each pillar, but two foundation piles 3 are bothered, which is inconvenient both in terms of construction cost and construction period. Being an economy is almost the same as the first method. Moreover, in order to secure the fixing degree of the column base by the rotational resistance by pushing and pulling the two foundation piles 3, 3, it is necessary to install the two foundation piles 3, 3 at a wide interval in the span direction. It is also uneconomical in that the amount of concrete at the pile head joint increases.

The third method is similarly uneconomical in that an economical basis that is determined solely by the vertical support force must be replaced with a large foundation 10 in order to obtain rotational resistance.

Although it is a technology for small-scale structures such as carports, it is a technology that reduces the labor and cost required for excavating soil and carrying out excavated soil by using soil concrete as a structure. Is proposed by Patent Document 1. However, this publicly known technique is to cast soil concrete integrally around the underground embedding part of the column and use the soil concrete as a foundation, such as a ramen frame supported by a pile foundation, a large span, Patent Document 1 does not disclose a foundation beam that secures the rigidity of a layer in a high-rise frame frame.

JP 2010-116754 A

The present invention has been made in view of the above-mentioned problems, and the object is as follows.
In a structure with a rigid frame supported by a pile foundation, by substituting the foundation beam function for soil concrete located in the center of the span of the rigid frame frame (for example, by ensuring the necessary bending rigidity as the foundation beam) , By omitting the foundation beam in the center of the span, reducing the amount of excavation for the foundation beam to ensure the degree of fixation of the column base, and reducing the material costs such as reinforcing bars and concrete for the foundation beam, The purpose is to reduce the construction cost and shorten the construction period.

In order to achieve the above object, technical measures taken by the present invention are as follows. That is,
The invention according to claim 1 is a structure having a ramen frame supported by a pile foundation and soil concrete, and at the column bases at both ends of the frame structure, an end portion of the foundation beam is formed at the end of the soil concrete. In the center part of the span of the rigid frame, the reinforcement of the foundation beam is replaced by the foundation beam function to secure the fixing of the column base and the foundation beam in the center part of the span is omitted. Yes.

According to the first aspect of the present invention, similar to the first method described at the beginning, although it is based on the idea of securing the degree of fixation of the ramen column base by the foundation beam, By providing a foundation beam-shaped end reinforcement only at the end, in other words, as if there is a foundation beam only at the edge of the soil concrete, reinforcement and concrete placement are carried out. By creating a thick end reinforcement, the anchorage of the column base can be increased. At the center of the span, the soil-concrete is thinner than the foundation beam, but the control width in the carry direction is that of the foundation beam. Since it is sufficiently wider than the beam width, it can secure the required bending rigidity as a foundation beam despite the fact that it is soil concrete.

Therefore, it is possible to secure the degree of fixing of the column base without providing a foundation beam at the center of the span of the rigid frame. The amount of excavation for the foundation beam and the reinforcement for the foundation beam to ensure the degree of fixation of the column base It is possible to reduce the cost of materials such as concrete and concrete, reduce the construction cost, and shorten the construction period.

It is the 1st floor floor plan of a structure which has a frame frame concerning the present invention. It is an AA line cross-sectional enlarged view of FIG. It is a principal part enlarged view of FIG. FIG. 4 is an enlarged cross-sectional view taken along line BB in FIG. 3. It is a vertical front view which shows other embodiment of this invention. It is a principal part enlarged view of the 1st floor floor plan which shows other embodiment of this invention. It is explanatory drawing of a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a structure having a large span, high floor ramen frame 1 having a span S supported by a pile foundation of 30 m or more and a floor height H of 20 m or more, and soil concrete 2 covering the entire indoor surface. The column bases at both ends of the ramen frame are each supported by one foundation pile 3 in the span direction. Ramen frame 1
Are arranged at predetermined intervals (for example, at intervals of 7 m) in the direction of the beam. Braces (not shown) are provided on the construction surfaces at both ends of the beam running direction, and braces (not shown) are provided at necessary portions between the frame frames 1 adjacent to each other in the beam running direction.

As shown in FIGS. 1 to 4, in the column bases at both ends of the ramen frame 1, a foundation beam-shaped end reinforcement 4 is provided at the end of the soil concrete 2, and at the center of the span of the ramen frame 1 By replacing the foundation beam function with the soil concrete 2, the fixing degree of the column base is secured and the foundation beam in the center portion of the span is omitted. The dimension of the cross section of the end portion reinforcing portion 4 having the shape of a basic beam is set to about 1 m in length and width, and the length L is set to about 4 m. The thickness of the soil concrete 2 is appropriately set according to the use (loading load) of the structure, but is 180 m.
m or more is desirable. Incidentally, in the illustrated embodiment, since the structure is an automatic warehouse in which an automatic rack machine is installed, the thickness of the soil concrete 2 is set to 500 in consideration of the loaded load.
It is set to about mm.

Unless special consideration is given, the end range of the span S (the length L of the end reinforcement 4) is the span S.
The range of the span center part is 2/4 of the span S, but the end range (the length L of the end reinforcement part 4) can be changed by conducting an analytical study. End range is 1 / span of span S
It can be set narrower than 4. As the end range is set wider, the rigidity of the foundation beam increases, but instead, the construction labor increases and it becomes uneconomical. Therefore, in order not to be uneconomical, it is necessary for the designer to appropriately set an end range in which the rigidity of the foundation beam can be secured to some extent. Incidentally, in the illustrated example, the end range (the length L of the end reinforcing portion 4) is about 4 m, and the span S is 1
Although it is considerably shorter than / 4, it has been analytically confirmed that sufficient rigidity is secured at this end ratio.

Reference numeral 5 is an anchor bolt for fixing the column base, and 6 is a reinforcing reinforcing bar embedded in the end reinforcing portion 4, and is formed in a basket shape with the required number of main reinforcing bars 6a and ribs 6b in the same manner as the beam reinforcing bar. ing. The outer end of the end reinforcing portion 4 prevents the interference with the anchor bolt 5 and the reinforcing bar in the direction of travel, and the main reinforcement 6a.
In order to facilitate the fixing of the pile, it is projected outward from the pile head joint by an appropriate distance (for example, about 400 mm). 7 is a cracked stone, and 8 is abandoned concrete.

According to the above configuration, by providing the foundation beam-shaped end reinforcing portion 4 only at the end of the interstitial concrete 2, in other words, as if the foundation beam is only at the end of the interstitial concrete 2. The reinforcement of the column base can be increased by creating end reinforcements 4 that are thicker than the soil concrete 2 by placing reinforcements and placing concrete. The soil concrete 2 is the foundation beam in the center of the span. Although it is thinner, the control width in the girder direction is sufficiently wider than the beam width of the foundation beam, so that it is possible to ensure the necessary bending rigidity as the foundation beam even though it is soil concrete 2.

Therefore, it becomes possible to secure the degree of fixing of the column base without providing the foundation beam in the center of the span of the rigid frame 1 and the excavation amount for the foundation beam and the foundation beam for securing the degree of fixation of the column base are possible. Material costs such as rebar and concrete can be reduced, construction costs can be reduced and construction periods can be shortened.

Moreover, in said embodiment, the foundation pile 3 which supports the column base part of a ramen frame both ends is,
Since each of them is one in the span direction, as compared with the case in which the fixing degree of the column base is secured by the rotational resistance by pushing and pulling the two foundation piles 3 and 3 as in the second method explained at the beginning. In addition, the amount of concrete at the pile head joint in the span direction is small and economical.

FIG. 5 shows another embodiment of the present invention. This embodiment is characterized in that the end reinforcing portion 4 is a vertical haunch. Since other configurations and operations are the same as those of the previous embodiment, description thereof is omitted.

FIG. 6 shows another embodiment of the present invention. This embodiment is characterized in that there are a plurality (two in the illustrated example) of foundation piles 3 supporting the column bases at both ends of the rigid frame in the girder direction.

According to this configuration, since there are a plurality of foundation piles 3 supporting the column bases at both ends of the ramen frame in the girder direction, under a condition in which the supporting force is insufficient with only one foundation pile. Moreover, while securing a sufficient supporting force with a plurality of foundation piles 3, the amount of concrete at the pile head joint in the span direction can be reduced, which is economical. Since other configurations and operations are the same as those of the previous embodiment, description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Ramen frame 2 Concrete between concrete 3 Foundation pile 4 End reinforcement 5 Anchor bolt 6 Reinforcement reinforcement 6a Main reinforcement 6b Stirrup 7 Split chestnut 8 Discarded concrete 9 Foundation beam 10 Foundation S span L Length of end reinforcement H Floor height Q Horizontal force

Claims (1)

A structure with a rigid frame supported by a pile foundation and soil concrete. At the column bases at both ends of the rigid frame, a foundation beam-shaped end reinforcement is provided at the edge of the concrete between the frames, and the span of the rigid frame In the central part, the foundation beam function is replaced with soil concrete to ensure the fixing of the column base part and the foundation beam in the center part of the span is omitted.

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