JPH0460034A - Body constructing method - Google Patents

Abstract

PURPOSE:To minimize the section of each member such as column and beam by curving a lower chord member, connecting the top ends of a chord member branched in the lower part of a body to the lower chord member of a lower truss structure, and constructing the beam of each floor while supporting it by the chord member. CONSTITUTION:An upper truss structure 7 and a lower truss structure 8 are supported by columns 10, respectively. A prestress is given to the lower chord members 7a, 8a of the upper truss structure 7 and the upper truss structure 8 to curve the whole truss structure into upward projecting state. Then, a chord member 20 is suspended from the lower chord member 7a, and the chord member 20 is branched in the lower part of a body 5, and the respective top end parts 20a, 20b of the chord member 20 are connected to the lower chord 8a. A plurality of beams 12, 13, 14, 15 are successively provided in the middle part of the truss structures 7, 8 to control the distortion of the whole truss structure, and a compression force generated in the upper chord member is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a frame construction method suitable for use in constructing a structure.

"Conventional technology and its problems" Conventionally, each floor had a large cross section because each floor had to bear the load independently using a large-span beam.

Therefore, the floor height becomes larger and the weight of the entire frame increases, resulting in an increase in not only the frame but also finishing and temporary construction costs, and the overall cost increases due to larger parts and larger floors. It becomes expensive and productivity is not good.

In addition, when constructing structures including truss structures,
As shown in FIG. 3, there was a problem in that the truss structure I was curved as shown by the broken line 2 due to the self-inscription etc.

The present invention was made in view of the above circumstances, and includes:
The object of the present invention is to provide a horizontal building method that can make the cross section of each member of the frame, such as pillars and slats, constituting a structure thinner.

"Means for Solving the Problems" A third aspect of the framework construction method of the present invention is that, in a framework constituting a structure, an upper truss structure is constructed at an upper position of the framework, and an upper truss structure is constructed at a lower location of the framework. The lower chord of the lower truss structure is prestressed in advance to curve upward into a convex state, and the chord is suspended from the lower chord of the upper truss structure. This is done by branching out, connecting the tip of each chord member to the lower chord member of the lower truss structure, and constructing the beams of each floor while supporting them with the chord members.

A second aspect of the framework construction method of the present invention is that, in the framework constituting the structure, a prestress is applied in advance to the lower chord of the upper truss structure constructed at the upper part of the framework, so that it becomes convex upward. The chord members are bent from the lower chord member of the upper truss structure, the chord members are branched below this frame, and the tip of each chord member is connected to the lower chord member of the lower truss structure. A prestress commensurate with the number of beams to be installed on the chord members is applied in advance to curve the lower truss structure upward into a convex state, and the beams of each floor are supported by the chord members before construction. This is done by

"Operation" The framework construction method of the present invention applies prestress to the lower chord of the truss structure, thereby applying compressive force to the lower chord, causing the entire truss structure to curve upward. It is possible to control the deflection and reduce the compressive force generated in the upper chord.

Note that the dimensions of the connections between the lower chord ends of the upper truss structure and the lower truss structure are adjusted in the tensioned state. In this case, the length of the member is reduced by the axial compression force. Therefore, the tensile force of the lower chord can be reduced by making the elongation smaller than the amount of elongation of the material due to the load after completion.

"Example" Hereinafter, an example of the framework construction method of the present invention will be described with reference to the drawings.

As shown in FIG. 1, when building a frame 5 on ground G using the frame construction method of this embodiment, an upper truss structure 7 and a lower truss structure 8 are installed at the upper and lower positions of the structure, respectively. Deploy.

These truss structures 7.8 are each supported by columns lO.

As shown by the broken lines in FIG. 2, a prestress is applied to the lower chord members 7a and 8a of the upper truss structure 7 and the lower truss structure 8 in advance to make the entire truss structure convex upward. Curve it.

After this, the chord members 20 from the lower chord member 7a of the upper truss structure 7
hangs down, and the string members 20 are branched below this body 5, and the respective tips 20a and 20b of the string members 20 are
is connected to the lower chord member 8a of the lower truss structure 8.

Then, a plurality of threads 12, 13, 14, 15 are sequentially provided in the middle part of the truss structure 7.8.

Each of these beams 12 to 15 has a relatively large span without providing an intermediate column in the middle of the beam.

When installing the beams 12 to 15 on each floor, the beams 12 to 15 are constructed while supporting the intermediate portions of each beam 12 to 15 with the chord members 20. Therefore, the weight of each part 12 to 15 is
0, and the prestress of the truss structure 7.8 will be released when the construction of all the beams is completed.

Connecting members 22 are provided on the lower chord members 7a, 8a of the truss structure 7.8 in a contracted state, and are connected to the columns 10 when the frame body 5 is completed.

According to the column and beam construction method of this embodiment, the following excellent effects are achieved.

By hanging the upper truss structure 7 on the top floor, each part 12 to 15 on each floor has a large cross section, and by suspending the load of the intermediate floor from the truss structure 7, the cross section of each member such as columns, beams, etc. can be made smaller.

In addition, the lowest floor serves as an artificial ground for the work on the upper floors, making work more efficient.

A prestress force is applied to the lower chord member 8a of the lower truss structure 8 on the lowest floor to reduce the tensile force, thereby controlling stress and deflection.

In addition, by applying a similar prestress force to the lower chord members of the upper truss structure 8 on the top floor, stress control and deflection are controlled, thereby slimming the frame and reducing costs.

Next, another embodiment of the column and beam construction method of the present invention will be described.

The construction method of the columns and beams in this example is to prestress only the lower chord of the upper truss structure constructed at the upper part of the frame to curve it upward into a convex state, and to curve the lower chord of the lower truss structure , is different from the previous embodiment in that prestress is applied by applying tensile force to the string material.

The framework construction method of this embodiment can also produce effects similar to those of the embodiments described above.

"Effects of the Invention" According to the framework construction method of the present invention, by hanging a truss structure on the top floor of each part of each floor, each having a large cross section, the load of the intermediate floor can be suspended on the truss structure. By doing so, the cross section of each member such as pillars and casings can be made smaller.

In addition, the lower truss structure serves as an artificial ground for working on the upper floor, making it possible to improve work efficiency.

A prestress force is applied to the lower chord member of the lower truss structure to reduce the tensile force, thereby controlling stress and deflection.

Furthermore, by applying a similar prestress force to the lower chord members of the upper truss structure, stress and deflection are controlled, making the frame slimmer and reducing costs.

[Brief explanation of the drawing]

1 and 2 are general views for explaining the framework construction method of the present invention, and FIG. 3 is a diagram showing a conventional example. 5...Screen body, 7...Upper truss structure, 8...Lower truss structure, 7a, 8a...Lower chord member, lO...・Column, 12, +3, I4.15 ...Beam, 20...
...String material.

Claims (2)

[Claims] (1) In the frame that constitutes the structure, the lower chords of the upper truss structure constructed at the upper position of the frame and the lower truss structure constructed at the lower position of the frame are pre-stressed and moved upward. The chords are bent in a convex state toward the upper truss structure, and the chords are suspended from the lower chord of the upper truss structure, and the chords are branched below the frame, and the tip of each chord is connected to the lower chord of the lower truss structure. A frame construction method in which the beams of each floor are supported by the chord members. (2) In the frame forming the structure, the lower chord of the upper truss structure constructed at the upper part of the frame is prestressed in advance to curve upward into a convex state, and the lower chord of the upper truss structure is curved upward. The chords are suspended from the timber, and the chords are branched below this frame, and the tip of each chord is connected to the lower chord of the lower truss structure, and the number of beams to be installed on this chord is A framework construction method in which the lower truss structure is curved upward into a convex state by applying prestress in advance, and the beams of each floor are supported by the chord members.