JPH07102584A - Method of underground structural stud construction - Google Patents

Abstract

PURPOSE:To eliminate the need for the adjustment of length due to the error of execution between mainly installed structural studs by forming a girder between the studs so as to form a clearance and joining the clearance side of the girder by bolts or bearing the clearance side by a bracket. CONSTITUTION:Each girder 2, 3 of a basement and a first floor is formed in size shorter than normal size so as to form clearances for absorbing the error of execution among stud surfaces. Each girder 2 in floors lower than an underground first floor and the mainly installed structural studs 1 are joined by welding the studs and girder end sections, by joining the girder end sections and the mainly installed structural studs 1 positioned at clearances to stud surfaces by bolts and by filling the clearances with a cement composition 16. The mainly installed structural studs 1 and the girders 3 of the first floor are joined by the welding of the studs and the girder end sections and bearing by channel type brackets 17 in required length mounted on one sides of the opposed side faces of pairs of the mainly installed structural studs 1.

Description

Detailed Description of the Invention

[0001]

[Detailed Description of the Invention]

[0002]

2. Description of the Related Art As one of the construction methods for the basement floor, a method of using a true construction pillar is being adopted for the purpose of shortening the construction period. This true-structured true pillar extends over the top of a concrete foundation pile and is built in the ground.

[0003]

SUMMARY OF THE INVENTION In such a construction method,
Since a steel frame column is built in the center of the drilled hole and the lower end is inserted into the foundation pile, there is a problem with the accuracy at the time of building compared to the case where the column is built after the basement is drilled. However, if the columns are inclined, the length of the girder inserted between the columns will not match, and it is necessary to adjust the length according to the distance.

This length adjustment is carried out at a steel frame factory by measuring the length between flanges of a pair of permanent columns of the main structure after root cutting. For this reason, the length could not be adjusted until the length between the flanges was known, and the large beam had to be adjusted at the steel frame factory one by one, which was troublesome.

This problem is also due to the fact that both ends of the girder are joined by butt welding, and if there is a margin in the joining of at least one end, errors due to construction can be absorbed. However, it becomes possible to join large beams having the designed size as they are, but in such a case, a difficulty is likely to occur in the joining strength.

[0006] Therefore, as a means for absorbing a construction error, the present inventors formed a girder shorter than a normal dimension so that a clearance is formed between the girder and the side surface of the column, and one of the girders is welded to the column. The above-mentioned conventional technical problems have been solved first by adopting a different joining means in which the other of the joining and the clearance facing the side surface of the pillar is joined to the pillar by a bolt and a filler.

The object of the present invention is to adopt a new joining means for the construction of the first-story large beam in the above construction method, whereby the first floor can be completed earlier than before without being influenced by the progress of construction on the basement floor. , It is to provide an underground structure true pillar construction method that can be used early for loading materials for construction on the ground floor and installing various machines.

[0008]

[Means for Solving the Problems] The feature of the present invention according to the above-mentioned object is that a large beam on the first floor and the basement floor is root-cut under the main pillar of the underground structure which is built in the foundation pile in the ground. In order to erect it, each girder on the basement floor and the first floor is made shorter than the normal size so that a clearance to absorb the construction error will be created between the girder on the basement and the first floor. The joint with the true column is provided with a joint plate projecting a gusset plate that overlaps with the gusset plate on the side of the pillar on one end surface of the girder, and while joining the other end of the girder and the pillar by welding, the clearance The above-mentioned one end of the girder facing the side surface of the pillar is joined by a high tension bolt provided over the joining plate and the pillar flange side and a bolt inserted into both gusset plates, and the above-mentioned clear where the gusset plate is located The cement-based composition is filled into the housing, and the main structure true columns and the 1st floor girders are joined to each other by using a groove-shaped bracket of a required length provided on one side of the pair of main structure true columns facing each other. The purpose is to accommodate and support one end of the girder and weld the other end to the pillar.

[0009]

[Operation] In the above construction method, the welded joint is only on one side of the girder, and the joints on the other side are not restricted in length by the clearance. Even if they are different, the joint can be constructed without adjusting the length of the girder.

Further, the clearance side is joined by a high tension bolt provided over the joining plate and the pillar flange side below the first basement floor and a bolt inserted into both gusset plates, and further clearance is provided by the cement composition. Since it is filled by filling, the joint has a sufficient strength even if it is not welded, and since the gusset plate bears the shearing force, the robustness is maintained for a long time. In addition, since the groove-shaped bracket on the side of the column that supports the beam end bears the load in the first-floor construction, it can withstand the loading of materials and the installation of various machines for the construction on the ground.

[0011]

[Example] In the figure, 1 is a true structure pillar, 2 is a large beam on the basement floor, 3
Is a girder on the first floor, and they are made of steel. Reference numeral 4 is a concrete foundation pile which is placed in the ground 5, and the true pillar 1 of the main structure is installed in the foundation pile. The installation of each of the above girders on the pillar is
After suspending and joining the 1st floor large girder 3 between the pillars of the main structure true pillar 1 excavated by root cutting, the root cutting on the lower floor and the joining of each girder 2 on the basement floor are performed in order. .

In the main structure true pillar 1 described above, the upper part of the cross pillar 1a having the pillar flanges 12 integrally on the four side surfaces is connected to the box pillar 1b.
The cross section is changed to the upper part and the upper part of the girder 3 is installed. Gusset plates 6 and 7 in which bolt holes for mounting girders are bored are vertically projectingly provided on the pillar flange 12 for each floor height of the basement floor. Further, the girders 2 and the first floor girders 3 are preliminarily made shorter than the normal dimension so that a required clearance 8 is generated between the girder 2 and the side surface of the main structure true pillar 1. The construction error of the length between the columns due to the inclination of the columns 1 can be absorbed.

This construction error is due to the true pillar 1 of the main structure on the 3rd basement floor.
If the height is 15.6m and the error is 2/1000, it will be 31mm on the 1st floor, 22mm on the 1st basement floor, and 13mm on the 2nd basement floor. It

A rectangular joint plate 9 having a larger area than the beam end face is welded to one end face of the large beam 2 like a flange, and a gusset plate 10 overlapping the gusset plate 7 is formed on the outer surface of the joint plate 9. Is projected. Although not shown in the drawing, bolt holes are provided at the four corners of the joining plate 9, and the gusset plate 10 has a required number of bolt holes 11 with loose holes having a width that allows for construction accuracy, as shown in FIG. Has been drilled.

A joint plate 13 is in contact with the inner side of the column flange 12 of the main structure 1 where the gusset plate 7 is located, and the joint plate 13 extends from the joint flange 13.
Through which the high tension bolts 14 can be inserted into the four corners of the joint plate 9 of the girder 2.

The box pillar 1b above the true pillar 1 of the main structure
As shown in FIG. 2 and FIG. 5 and subsequent figures, a U-shaped rectangular groove-shaped bracket 17 that supports one side of the first-order girder 3 is provided. As shown in detail in FIG. 7, the groove-shaped bracket 17 has a square tubular body 18 made of steel that fits around the box column 1b, and one side surface of the square tubular body 18 or two side surfaces at right angles. , A pair of side members 19 made of I-shaped steel which are welded in parallel at a required interval and a steel bottom plate 20 for receiving the first-order girder 3, and the upper and lower flanges 21 of the side members 19 of the rectangular tubular body 18 Diaphragm 2 integrally formed on the top and bottom
It is connected flush with the 2 so that the slab 23 on the first floor can be installed on those flanges.

A gusset plate 24 having a bolt hole for mounting a girder is vertically projected on the side surface of the facing main structure true column facing the groove-shaped bracket 17, and the gusset plate 24 is on the first floor. The ends of the girder 3 are joined by bolts, and then the flange can be butt-welded to the flange 22 on the column side.

The girders 2 on each floor with respect to the main pillar 1 of the main construction 2,
Erection of 3 starts from the 1st floor. After the construction of the true pillar 1 of the main structure is completed, the ground is cut off to dig out the upper box pillar 1b, and the groove-shaped bracket 17 is formed on one side of the box pillar 1b of the opposite pillar of the main pillar 1 of the main structure. Attach. To mount the groove-shaped bracket 17, after fitting the square tubular body 18 into the box column 1b from above, the square tubular body 18 is attached to the box column 1b.
It is performed by welding to b.

1 when the construction of the groove bracket 17 is completed
Construction of the girder 3 on the floor. First, from the top, between the pillars, 1st floor girder 3
Is suspended and one end is housed in the grooved bracket 17.
Next, it is hung horizontally and the other end is joined to the gusset plate 24 with a bolt. At this time, even if there is a construction error in length between the pillars due to the installation accuracy, the groove-shaped bracket 1
Since there is a clearance between the beam end supported by 7 and the column, the joint can be performed without any trouble. After the joint, the beam flange and the column side flange are butt-welded together. As a result, the first-floor girder 3 is mounted and supported by a pair of facing permanent columns 1 of the main structure, one end of which is accommodated and supported by the groove-shaped bracket 17, and the other end of which is joined to the side surface of the facing column by welding.

When the construction of the large beam 3 on the first floor is completed,
The slab 23 on the first floor is constructed and root cutting is performed up to the first basement floor. At the same time, construction of the above-ground section will begin. In the connection of the girder 2 to the true structural true column 1 after the root cutting, first, the end portion on the side where the connection plate 9 is not present is connected to the gusset plate 6 by the bolt 15a. As a result, the end on the side of the joining plate 9 is attached to the side surface of the column on the opposite side and the clearance 8
And the gusset plates 7 and 10 mentioned above.
Polymerize with each other. Further, since one of the two bolt holes is a loose hole, the positional deviation due to the inclination of the true pillar 1 of the main structure is adjusted, and the bolt 15 can be inserted.

Therefore, the gusset plates 7 and 10 are jointed by the bolts 15 to set the large beam 2 over the main structure columns 1 and 1, and the beam ends previously joined are butt welded to the column flange 12a.

Next, the high tension bolt 14 is inserted from the joint plate 13 on the column side to the joint plate 9 on the beam side for temporary tightening. When the joining by the bolt 15 and the high tension bolt 14 is completed in this way, a frame of an iron plate is provided around the clearance 8 and the joining plate 9
A cement composition such as high-strength mortar or grout material or high-strength concrete is filled between the column flange 12 and the pillar flange 12, and the clearance 8 is filled with the filling 16.
The main structure true pillar 1 and the girder 2 are integrally joined. Filling 16
After reaching the required strength, the high tension bolt 14 is tightened to complete the connection.

In the above description, the groove-shaped bracket 17 is attached on site, but in some cases, the groove-shaped bracket 17 may be attached first to install the main structure column 1. .

[0024]

As described above, according to the present invention, the girders of each floor are formed in advance shorter than the normal size so that the construction error of the length between the columns caused by the installation accuracy of the true structure true columns can be absorbed. , One of the girders is joined to the column by welding, and the other is exposed to the side of the column with a clearance, and the other one is constructed by using different joining means such as joining the column with bolts and fillers or supporting with a groove bracket. Since the connection with the pillar is performed, it is possible to absorb the installation accuracy error of the true structure true pillar by the preset clearance, and it is possible to join the girder manufactured in the factory without adjustment. As a result, the length measurement between columns for joining each girder can be omitted, and since the length adjustment processing of the girder is also unnecessary, the construction of the girder becomes easy,
The construction period is also shortened.

In addition, since the gusset plate for setting bears the shearing force after joining in the large beam on the basement floor, the robustness is maintained for a longer period than the joining by only bolts, and on the first floor, the side surface of the column supporting the beam end is supported. Since the groove-shaped bracket bears the load, it can withstand the loading of materials and installation of various machines on the ground, and the welding work can be done by only one side joint and welding, so the time required for the first floor construction is shortened. As a result, it is possible to carry out the construction of the above-ground portion at an early stage, which has the advantage that the cost can be reduced by shortening the construction period.

[Brief description of drawings]

FIG. 1 is a construction drawing showing a joining means of a main structure true pillar and each girder in an underground structure true pillar construction method according to the present invention.

FIG. 2 is a schematic plan view showing the arrangement of grooved brackets on the first floor.

FIG. 3 is a side view showing a joined state of a girder and a pillar on a basement floor.

FIG. 4 is a plan view of the above.

FIG. 5 is a side view showing a joined state of a large beam and a pillar on the first floor.

FIG. 6 is a plan view of the above.

FIG. 7 is a partial perspective view showing the relationship between the girder on the first floor and the grooved bracket.

[Explanation of symbols]

 1 Main structure True column 1b Box column 2 Basement girder 3 1st floor girder 6,7 Pillar side gusset plate 8 Clearance 9 Girder side joining plate 10 Girder side gusset plate 11 Bolt hole 12 Column flange 13 Column side Joining plate 14 High tension bolt 15 Bolt 16 Clearance filling 17 Groove bracket 18 Square tube 19 Both side members 20 Bottom plate 21 Diaphragm 22 Column side flange

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaaki Nakanishi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (1)

[Claims] [Claim 1] When a large beam on the first floor and the underground floor is erected by cutting the underground, the large beam on the basement and the first floor is installed on the true pillar of the main structure of the basement built in the underground pile. Is made shorter than the normal size so that a clearance to absorb the construction error is created between the side surface of the pillar and each large beam below the first basement floor, and the main structure is connected to one end face of the large beam. Providing a joint plate projecting a gusset plate that overlaps with the gusset plate on the side of the pillar, and while joining the other end of the girder and the pillar by welding, join the one end of the girder that faces the side surface of the pillar across the clearance. The high tension bolts provided over the plate and the column flange side are joined with the bolts inserted through both gusset plates, and the cement composition is filled in the clearance where the gusset plates are located. The connection between the pillar and the first-order girder is made by accommodating and supporting one end of the first-order girder in a groove-shaped bracket of a required length provided on one side of the opposite side faces of a pair of main construction true pillars, and welding the other end to the pillar. Underground structure true pillar construction method characterized by being carried out.