JP2000144892A - Construction method for upper frame of large span girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by jacking up the pillars of a frame at every provision of an upper frame over one layer on a girder, and letting the girder bear the load of the upper frame. SOLUTION: In a structure having a well under a girder 1 of large span provided on an intermediate story, jacks 4 are provided between the gider 1 and pillars 21 to construct an upper frame 2. In this case, for example, after completing construction of the pillars 21 and the beams 22 of the whole frame 2, the pillars 21 of which the lower ends are connected to the girder 1 and not connected to the pillar 31 of a lower frame are jacked up at every construction of a slab from the lower layer side of the frame 2. At every placing of concrete of each story, a jack-up work of the pillars 21 is repeated until after placing the slab of the uppermost story so as to make zero the vertical displacement generated on the slab or the beam of the directly upper story of the girder 1. Hereby, the girder can bear the load of the upper frame, the burden of the beam of the upper frame can be reduced, and the obstacle for construction under the intermediate story can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an upper frame so that when an atrium is formed below a middle floor, a load of an upper frame above a large span girder installed on the atrium is applied to the large span girder. And a method of constructing the same.

[0002]

2. Description of the Related Art As shown in FIG. 7, in a structure in which a stairwell is formed below a middle floor, a frame above the stairwell has an axial force and a bending moment due to a vertical load. Although it is often designed as a fieldend beam that bears, the design becomes complicated and the load on the beam of the upper frame increases, so the size of the large span large beam installed on the intermediate floor is increased, In some cases, an axial force of a column connected to the girder is caused to flow through the girder so that much of the load on the upper frame is borne by the girder, but not by the upper frame.

[0003] In this case, if the upper frame is constructed on the girder as usual, the beam of the upper frame is connected to the column so as to bear a part of the axial force of the column. Most of the load on the upper frame will not be borne, and the design intention will not be reflected.

Therefore, prior to the construction of the upper frame, as shown in FIG. 8, a cable 9 or the like is erected between the floor of the stairwell and a girder above the stairwell, and a downward deformation of the girder is performed by tensioning the cable 9 or the like. By giving it forcibly, maintaining the amount of deformation until the completion of the construction of the upper frame, and leaving the deformation, the load of the upper frame is finally borne by the girder.

In the construction of the upper frame, the tension is adjusted so that the sum of the load and the tension of the upper frame up to the floor where the construction is completed is always constant, so that the amount of deformation initially applied to the girder is maintained. The tension is released together with the completion of the entire upper frame, so that the load on the upper frame that causes the amount of deformation initially applied to the girder is applied to the girder.

In this method, a cable having a length corresponding to the entire height of the stairwell is required, and large-scale equipment such as a fixing device such as an anchor for fixing the end portion and a tension introducing device such as a counterweight is required. As a result, equipment costs increase.

[0007] Further, since the cable is present in the section from the lowest floor of the atrium to the girder until the completion of the construction of the upper frame, when finishing the lower frame below the girder, etc.,
There are disadvantages such as obstruction of construction.

In view of the above background, the present invention proposes a construction method that solves the problem of the method using a cable while allowing the load on the upper frame to be applied to the girder.

[0009]

According to the present invention, after the girder is erected, a jack is installed between the column of the upper frame standing on the girder and the girder, and the column is supported on the jack. The work of jacking up the columns is repeated every time the entire frame or a part of the frame of one layer or more is constructed, thereby obtaining a state in which the load of the upper frame is borne by the girder. The frame of the upper frame may include only columns and beams, or may include a slab or a slab and a wall.

As the construction of the upper frame progresses, FIG.
As shown in the figure, by connecting the beam 22 of the upper frame 2 to the column 21, the beam 22 bends downward due to the weight of the frame, and the column 21 is compressed and deformed in the axial direction. Each time a part is constructed, the beam 22 of the upper frame 2 and the pillar 21 connected to the girder 1 are repeatedly jacked up so that the deflection of the slab is eliminated, so that all the beams 22 and the slab of the upper frame 2 are kept horizontal. Dripping.

On the other hand, the axial force of the column 21 as a reaction force acts on the girder 1 by jacking up the column 21.
Tries to bend downward as shown in (b). Fig. 6- (a)
In the case of (b), the beam 22 of the upper frame 2 and the upper frame 2 of the column to which both ends of the girder 1 are connected bear part of the axial force of the column 21 connected to the girder 1, and Sometimes the girder 1 bears much of the axial force of the column 21 due to the reaction force when jacking up,
The state is transmitted from the girder 1 to the pillars at both ends. The girder 1 bears much of the axial force of the column 21 so that the upper frame 2
The load on the beam 22 is released or reduced.

FIG. 6 shows a case where the girder 1 is manufactured so that the axis is straight, and the girder 1 bends downward when the load of the upper frame 2 is loaded. In some cases, the girder 1 may be manufactured in advance in a shape having a peeling so that the axis becomes horizontal when the girder 1 bears the load of the upper frame 2. If the final deflection of the girder 1 is small enough not to affect the finish of the outer wall or the like, the former method can be used.

The amount of deflection of the girder is sequentially added to the upper frame toward the upper floor, and is added each time a pillar is jacked up. Finally, the upper frame is constructed in a state where the girder is deformed using a cable. In the same manner as in the above case, the load on the upper frame that causes the total deflection of the girder is applied to the girder.

As a result, the beam of the upper frame does not bear a part of the axial force of the column, or the load of the beam is reduced, so that the load of the beam of the upper frame is reduced and the vertical load is applied to the column. This reflects the design intent that no bending moment is applied.

Since the work of applying the load of the entire upper frame to the girder can be performed only by the jacks installed on the girder, the number of facilities can be reduced as compared with the case of using cables, and the cost can be reduced.

[0016] Further, since the installation of the jack does not block the atrium, there is no obstruction to the construction at the middle floor or lower, and the workability is improved. When the number of floors of the upper frame is large and the amount of deformation of the columns of the upper frame in the axial direction is large, the number of floors to be jacked up is dispersed into a plurality of floors as described in claim 2, so that the compression deformation of the columns is reduced. The effect on the upper frame can be reduced, and the ability of the jack is also reduced.

In this case, together with the construction of the upper frame for one layer or a plurality of layers, a jack is installed between any of the beams of the upper frame and the pillar erected thereon, and the pillar is connected to the jack. The operation of jacking up the pillars is repeated every time the whole frame or a part of the frame of one or more layers on the beam is constructed while being supported. The jack-up on the beam of the upper frame is performed in parallel with the jack-up on the girder.

In the case where the frame of the structure is a steel frame or a steel reinforced concrete structure, and when the construction of the steel frame of the entire upper frame is to be preceded, the entire upper frame is constructed after the erection of the girder. At the same time, a jack is installed between the girder and the pillar connected to it, and with the pillar supported by the jack, the floor slab of the upper frame is laid from the lower side, or concrete of the slab is poured from the lower side Each time a slab is constructed from the lower side, the operation of jacking up the pillar is repeated.

Also in this case, in the case where the number of floors of the upper frame is large and the amount of deformation of the columns of the upper frame in the axial direction is large, claim 4
In addition to the jack on the girder as described in the above, with the construction of the entire upper frame, with a jack installed between any of the beams of the upper frame and the pillar connected to it, the jack was supported by the jack, Each time the slab on the beam is built from the bottom,
The work of jacking up the pillar is repeated.

[0020]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upper frame constructed above a girder 1 in a structure as shown in FIG. 2 is a method in which a vertical load of the upper frame 2 is applied to the girder 1 by using a jack 4 installed on the girder 1.

The drawing shows a case where the lower frame 3 up to the intermediate floor where the girder 1 is installed is made of steel-framed reinforced concrete, and the girder 1 and the upper frame 2 are made of steel, but the lower frame 3, the upper frame 2 and the girder 1 Does not matter.

In FIG. 7 and FIG. 2 which is a detailed view thereof, the construction of the entire lower frame 3, the casting of concrete on the lower frame 3, and the erection of the girder 1 are completed, and the columns 21 and beams of the entire upper frame 2 are completed.
When the construction of the slab 24 is completed, every time the slab 24 is constructed from the lower layer side of the upper frame 2 by casting concrete,
The case where the jack 21 is jacked up is shown. After the construction of the lower frame 3 as a whole, the casting of concrete into the lower frame 3 and the erection of the girder 1 are completed, the columns 21 and beams 22 of the upper frame 2 are The column 21 may be jacked up each time the slab 24 is constructed by casting concrete or the like while being constructed from the lower layer side.

When the frame of the structure is a steel frame, after the construction of the entire lower frame 3 and the erection of the girder 1 are completed, the upper frame 2
The columns 21 and beams 22 were constructed from the lower layer side, and every time the floor slab was laid, the columns 21 were jacked up or the construction of the columns 21 and beams 22 of the entire upper frame 2 was completed as in FIG. Thereafter, every time a floor slab is laid from the lower side, the pillar 21 is jacked up.

In the case of reinforced concrete, the lower frame 3
After the entire construction and the erection of the girder 1 are completed, each time the slab 24 is constructed from the lower side by laying the floor slab or casting concrete together with the construction of the columns 21 and the beams 22 of the upper frame 2, Jack up or build the entire lower frame 3 and girder 1
After the completion of the erection and the construction of the pillars 21 and the beams 22 of the entire upper frame 2, the pillars 21 are jacked up every time the slab 24 is constructed from the lower layer side by laying a floor slab or placing concrete. Become.

FIGS. 1, 2 and 7 show that, as described above, the steel reinforced concrete frame up to the intermediate floor where the girder 1 is erected is completed, and the columns 21 and beams 22 of the entire upper frame 2 have been erected. As shown, the upper frame 2 is constructed with a jack 4 installed between the girder 1 and a pillar 21 connected thereto.

In this case, the operation of jacking up the column 21 is repeated every time the concrete of the slab 24 of the upper frame 2 is driven from the lower side while the column 21 is supported by the jack 4. The jack up is connected to the girder 1 at the lower end,
This is performed for the pillar 21 that is not connected to the pillar 31 of the lower frame 3.

As shown in FIGS. 1 to 3, the jack 4 is installed beside the column 21 of the upper frame 2 after the bridge 1 is erected. FIGS. 4 and 5 show the details of the portions A and B in FIG. 2, respectively. In FIG. 3, jacks 4 for large loads and jacks 4 for small loads are alternately arranged according to the axial force of each column 21.
3 to 5, reference numeral 5 denotes a stiffener for stiffening the flange when the girder 1 is a steel frame.

A reaction force receiving bracket 6 for receiving the axial force of the jack 4 protrudes from a side surface of a lower end portion of the column 21 directly supported by the jack 4, and a jack is provided between the reaction force receiving bracket 6 and the beam 1. 4 is installed. The jack 4 is installed on a bundle 25 installed on the girder 1.

An adjusting column 23 for supporting the column 21 between the lower end of the column 21 and the girder 1 until the column 21 is completely jacked up.
Is installed, and the adjustment column 23 is connected to the column 21 by the splice plate 7 to ensure safety during construction. The bolt hole 7a on either side of the splice plate 7 that is joined to the column 21 or the side that is joined to the adjustment column 23 is formed in a long hole shape in consideration of the total jack-up amount of the column 21. The bolt 8 inserted through the elongated bolt hole 7a is fully tightened after the final jack-up of the column 21, or after the splice plate 7 is replaced with a splice plate having a bolt hole that is not an elongated hole. You.

When the column 21 is made of steel frame or reinforced concrete, the reaction force receiving bracket 6 protrudes from the side surface of the column 21, and the adjusting column 23 is installed between the girder 1 and the column 21. In the case of the reinforced concrete structure, after the final jack-up of the column 21, the adjusting column 23 is removed, and at that portion, the joint between the main reinforcing bar of the column 21 and the reinforcing bar projecting from the girder 1 is performed, and concrete is poured. The connection method between the column 21 and the girder 1 in the portion where the adjustment column 23 is installed is arbitrarily selected according to the structural type of the column 21 and the girder 1.

The adjusting column 23 may be installed below the column 21 after the final jack-up of the column 21 is completed. In this case, after the column 21 is jacked up, the adjusting column 23 is inserted under the column, and the adjusting column 23 is inserted. Pass the splice plate 7 between the bolts 8
After the final tightening, the axial force of the jack 4 is released.

After the construction of the columns 21 and the beams 22 of the entire upper frame 2 is completed, the concrete of the slab 24 immediately above the girder 1 or the concrete of the columns 21 or the columns 21 and the beams 22 together with the slab 24 is removed. It is cast. Vertical displacement of the slab 24 and the beam 22 is caused by placing concrete on the floor directly above the girder 1. After the displacement occurs, the column 21 is jacked up so that the vertical displacement becomes zero. The jack-up is performed in a state where the bolt 8 inserted into the elongated bolt hole 7a on either the column 21 side or the adjustment column 23 side of the splice plate 7 is loosened.

Subsequently, after the concrete on the upper floor is further poured, the girders 1 are cast by the concrete on the floor.
The column 21 is jacked up until the vertical displacement generated in the slab 24 and the beam 22 immediately above the floor becomes zero.

Similarly, every time concrete on each floor is cast, the work of jacking up the column 21 until the vertical displacement generated on the slab 24 or the beam 22 immediately above the girder 1 becomes zero is performed on the concrete on the top floor. It is repeated until after casting.

After the jacking-up after the concrete on the top floor has been completed, the adjusting column 23 on the girder 1 and the column 21 immediately above the adjusting column 23 are inserted through the elongated bolt holes 7a of the splice plate 7 to join them. After the bolts 8 are fully tightened and the load borne by the column 21 is borne by the girder 1 through the adjustment columns 23,
The axial force of the jack 4 is released, and the construction is completed.

When the number of floors of the upper frame 2 is large, the jack 4 is installed between any of the beams 22 of the upper frame 2 and the pillars 21 connected thereto, and the pillars 21 are jacked. When the slab 24 on the beam 22 is constructed from the lower layer while being supported by the beam 4, the operation of jacking up the column 21 is repeated in parallel with the jacking up on the girder 1.

In this case, the reaction force receiving bracket 6 is protruded from the column 21 supported by the jack 4, and the adjusting column 23 is installed between the column 21 and the beam 22.

[0038]

According to the first aspect of the present invention, a jack is installed between the pillar of the upper frame standing on the girder and the girder, and each time the upper frame on the girder is constructed with the column supported by the jack. ,
The axial force of the pillar as a reaction force at the time of jacking-up by repeating jacking-up of the pillar and repeating the jacking-up of the pillar every time the slab of the upper frame is constructed after the construction of the upper frame according to claim 3, by repeating the jacking-up of the pillar. Is applied to the girder to cause the girder to bend, so that the girder can bear the load of the upper frame that finally causes the girder to have the total amount of bending.

As a result, the beam of the upper frame does not bear a part of the axial force of the column, or the load on the beam is reduced, the load on the beam of the upper frame is reduced, and no expectation of the Feerendiel effect is expected. Is reflected.

Since the work of applying the load of the entire upper frame to the girder can be performed only by the jacks installed on the girder, the number of facilities can be reduced as compared with the case of using cables, and the cost can be reduced.

Also, since the installation of the jack does not block the stairwell, there is no obstacle to the construction at the middle floor or lower, and the workability is improved. In claim 2 and claim 4, since the floors for jacking up are dispersed into a plurality of floors, even when the number of floors of the upper frame is large and the amount of deformation of the columns of the upper frame in the axial direction is large, the compression deformation of the columns is also small. The upper frame can be easily raised, and the capacity of the jack is reduced.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a state where a jack is installed between a girder and a column of an upper frame.

FIG. 2 is an elevational view showing a state where a jack is installed on a girder of the structure of FIG. 7;

FIG. 3 is a plan view of FIG. 2;

4 (a) is a detailed view of a part A in FIG. 2, and FIG. 4 (b) is an x-
It is an x-ray sectional view.

5 (a) is a detailed view of a portion B in FIG. 2, and FIG.
FIG. 3 is a sectional view taken along line y.

FIG. 6 (a) is a schematic diagram showing a state in which the beam of the upper frame bears the axial force of the column, and FIG. 6 (b) shows a state in which the girder bears the axial force of the column. It is a schematic diagram.

FIG. 7 is an elevation view showing a structure in which a stairwell is formed under a girder.

FIG. 8 is an elevation view showing a conventional method of forcibly deforming a girder using a cable.

[Explanation of symbols]

1 ... giant beam, 2 ... upper frame, 21 ... pillar, 22 ... beam, 23
...... Adjustment column, 24 ... Slab, 25 ... Bundle column, 3 ... Lower frame, 31 ... Column, 4 ... Jack, 5 ... Stiffener, 6 ...
… Reaction force receiving bracket, 7 …… Splice plate, 7a
... bolt holes, 8 ... bolts, 9 ... cables.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsumasa Tsunoda 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Within the Yokohama Branch of Kashima Construction Co., Ltd. (72) Isamu Hirano 4-chome Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture 51 Kashima Construction Co., Ltd. in Yokohama Branch (72) Inventor Kohei Minowa 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. in Yokohama Branch (72) Inventor Hisao Tanaka Otacho, Naka-ku, Yokohama-shi, Kanagawa 4-51, Kashima Construction Co., Ltd. Yokohama Branch

Claims (4)

[Claims] 1. A method for constructing an upper frame constructed above a girder in a structure in which a stairwell is formed below a girder of a large span installed on an intermediate floor, comprising: A jack is installed between the pillar and the girder of the upper frame that is erected on the top, and the entire frame or a part of the frame of at least one layer on the girder is constructed with the pillar supported by the jack. A method of constructing a large span large beam upper frame that repeats jacking up columns every time. 2. A single-layer or multiple-layer upper frame is constructed, and a jack is installed between any of the beams of the upper frame and a column erected thereon, and the column is supported by the jack. 2. The method for constructing a large span large beam upper frame according to claim 1, wherein the work of jacking up the pillars is repeated every time the entire frame of one or more layers on the beam or a part of the frame is constructed in the state in which the beams are made. 3. A method for constructing an upper frame constructed above a girder in a structure in which a stairwell is formed under a large span girder constructed on an intermediate floor. With the construction of the entire frame, a jack was installed between the girder and the pillar of the upper frame connected to it, and with the pillar supported by the jack, every time the slab of the upper frame was constructed from the lower layer, Construction method of large span large beam upper frame that repeats jacking up work. 4. When the entire upper frame is constructed, a jack is installed between one of the beams of the upper frame and a column connected to the beam, and the slab on the beam is placed in a lower layer while the column is supported by the jack. The method according to claim 3, wherein the work of jacking up the columns is repeated every time the building is constructed from the side.