JP3322652B2 - Precast composite column joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast composite column, such as a precast steel pipe concrete column, in which a plurality of precast composite columns formed by filling concrete in a rectangular tubular metal pipe are arranged side by side. After welding the upper end of the metal pipe at the upper end and the lower end of the metal pipe at the upper precast composite column, the gap between the upper end face of the concrete section at the lower precast composite column and the lower end face of the concrete section at the upper precast composite column is The present invention relates to a method for joining a precast composite column which is filled with a compressive force transmitting material and cured.

[0002]

2. Description of the Related Art As a method of joining a precast composite column of this kind, a lower end surface of a concrete portion of an upper precast composite column is largely inclined in order to improve a filling property of a compressive force transmitting material. Japanese Patent Application Laid-Open No. 63-11737 and Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 4-166606 proposes a method of forming a groove in the outer peripheral portion of concrete in contact with a metal pipe and separating a concrete surface from a welded portion in order to prevent deterioration of concrete caused by welding heat. 213640
No., proposed by US Pat.

[0003] However, in the former method, the end face shape of the precast composite column is complicated, and it takes time and effort to manufacture the precast composite column. There was a problem that it took.

[0004] In the latter method, the end face shape of the precast composite column is complicated, the production of the precast composite column is troublesome, the filling property of the compressive force transmitting material is deteriorated, and voids (bubbles) are generated at the joint. There was a problem that it was easy.

[0005] Therefore, as in the invention described in JP-A-4-309669, after the upper end of the metal tube in the lower precast composite column and the lower end of the metal tube in the upper precast composite column are welded, the concrete portion is welded. The vacuum filling method of filling the compressive force transmitting material after bleeding the air in the gap between the upper and lower surfaces facing each other has been used in combination, but this requires a lot of work on site. However, there was a disadvantage that workability was poor. If a groove is not formed in the outer peripheral portion of the concrete in contact with the metal pipe, the concrete is affected by the welding heat, and the compressive strength is reduced. This can be sufficiently compensated for by designing the structure such as arranging the joints or enlarging the cross section of the member.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and has a simple structure capable of transmitting a force acting on a column within a range of conditions required for structural design. It is an object to establish a method for joining precast composite columns with good workability.

[0007]

The technical measures taken by the present invention to solve the above-mentioned problems are as follows. That is, in the method for joining precast composite columns according to the first aspect of the present invention, a plurality of precast composite columns formed by filling concrete in a rectangular tubular metal pipe are arranged vertically and arranged, and a lower precast composite column is provided. After welding the upper end of the metal tube in the column and the lower end of the metal tube in the upper precast composite column, the gap between the upper end surface of the concrete part in the lower precast composite column and the lower end surface of the concrete part in the upper precast composite column the compressive force transmitted member a method of joining pre-cast composite pillars cured by filling in, on opposing the concrete section, the lower end surface is formed on a plane perpendicular <br/> each pillar axis And pressure
One compression transmission material injection hole is formed for one joint.
Air vents per joint, one per corner
A total of four are formed, one for each, and the four air discharge holes are
Each is approximately L-shaped when viewed from the side and bent into a substantially U-shape when viewed from above
And one end of the air discharge hole is in each corner of the metal tube.
At the lower end of the concrete part,
Open to the side of the side of the metal tube above the gap
In addition, the compressive force transmitting material injection hole is formed in the upper or lower precast composite column , and one end is formed at one of the opposed upper and lower end surfaces of the concrete cleated portion in the vicinity of the corner of the metal tube. Opening,
Formed by bending a side view L-shape so as the other end opened to the metal tube side in the upper or a lower position than the gap
Then , a compressive force transmitting material is injected into the gap from the compressive force transmitting material injection hole.

[0008] In the present invention, the sectional shape of the precast composite pillars, positive rectangular, may be any of square rounded corners.

According to the configuration of the present invention described in claim 1,
If the upper and lower ends of the concrete part are opposite to each other,
Because it is formed on a plane perpendicular to the core,
The simple shape of the end face of the joint column makes it possible to manufacture precast composite columns.
Easy. In particular, one end (injection port) of the compression force transmitting material injection hole bent in a substantially L-shape when viewed from the side is opened at one of the opposed upper and lower end surfaces of the concrete portion in the vicinity of the corner of the metal pipe. , Four air discharge holes, one for each corner, are formed to be substantially L-shaped in side view and substantially U-shaped in plan view, and one end (exhaust port) of the air discharge hole is formed. Are opened at the corners of the metal tube at the lower end surface of the concrete portion, and the other ends are opened above the gap and at the side surfaces of the sides of the metal tube, thereby obtaining the following effects.

That is, among the gaps filled with the compressive force transmitting material, the corners of the rectangular tube-shaped metal tube are the places where bubbles are most likely to remain. Although it is desirable to exhaust air from all corners, the corners are weak points in strength depending on the metal tube,
There are cases where it is desired to avoid cross-sectional defects due to drilling. Even in such a case, according to the above configuration, the compression force transmission
The delivery material injection hole has a shape that is approximately L-shaped when viewed from the side.
At one end near the corner of the metal tube.
The upper and lower ends of the concrete
And open the other end to the side of the metal tube, one for each corner
The four air discharge holes provided are approximately L-shaped when viewed from the side.
Shape and bent into a substantially U-shape in plan view.
Open the end to the bottom of the concrete section at the corner of the metal tube.
And the other end is above the gap and at the side of the metal tube.
Since the side surface of the are is opened, without perforation in the angle of the metal tube, it is possible to exhaust from the corner of the metal tube.

[0011]

According to the second aspect of the present invention, since the opposed upper and lower end surfaces of the concrete portion are each formed in a plane perpendicular to the column axis, the end surface shape of the precast composite column is changed. Simple and easy to manufacture the precast composite column, and the upper and lower end surfaces are flat and the gap between them is set to 25 mm to 35 mm. Time is short.

Further, since the upper and lower end surfaces are flat and the gap between them is set to 25 mm to 35 mm, the compression is performed only by the discharge pressure of a general grout pump such as a snake pump or a squeeze pump. The force transmitting material can be easily filled, and the porosity (the ratio of the void to the volume of the gap to be filled with the compressive force transmitting material) can be suppressed to 5% or less.

That is, if the gap is 25 mm or less, the resistance at the time of filling is large, and it is difficult to fill the compressive force transmitting material only by the discharge pressure of a general grout pump such as a snake pump or a squeeze pump. , 35 mm or more, it is easy to fill the compressive force transmitting material, but there is a problem that the porosity increases. The compressive force transmitting material injected into the gap from the compressive force transmitting material injection hole gradually fills the opposite side in a shape close to a fan shape from the inlet opening on the end face of the concrete part, but it fills up. Is 35m
If it is more than m, it flows into the other side at a stretch and bounces back, swells locally and comes into contact with the ceiling surface of the gap (the lower end surface of the concrete part in the upper precast composite column), shutting off between the air discharge hole Therefore, an air pocket is formed just below the ceiling surface of the gap, and the porosity increases. Therefore,
The gap is 25 mm to 35 mm (preferably 30 mm)
It is desirable to set to.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The pillars of the building, as shown in Figure 4,
A plurality of precast steel pipe concrete columns 1, which are examples of a precast composite column, are arranged side by side up and down, and the ends of the precast steel pipe concrete columns 1 are joined together.

As shown in FIGS. 1 and 2, the illustrated precast steel pipe concrete column 1 is formed by filling concrete inside a square tubular steel pipe 2 having a square cross section with rounded corners. For example, while the concrete filled in the steel pipe 2 is not yet solidified, the steel pipe 2 is forcibly rotated around its axis and centrifugally formed, and the same as the cavity formed in the center of the concrete by centrifugal molding. After filling with high-strength concrete, it is produced by a method of curing and solidifying. 3 shown in FIG. 1 is a concrete portion formed by filling in the steel pipe 2, the upper end face S ₁ and the lower end surface S ₂ is formed on a plane perpendicular pillar axis.
A bracket 5 for joining the beam 4 is fixed to an upper and lower intermediate portion of the steel pipe 2, and an erection piece 6 is fixed to both upper and lower ends. Reference numeral 7 shown in FIGS. 1 and 3 denotes a backing plate for welding, which is fixed to the upper end of each precast steel pipe concrete column 1 in advance.

As shown in FIGS. 1 and 2, one end (injection port) of each precast steel pipe concrete column 1 is a steel pipe 2.
The lower end face S of the concrete part 3 in the vicinity of the corner of
₂ to open, the other end (outer end) of the lower end surface S ₂ 1 This compression force transmitting material injection hole 8 which is bent in side view L-shape so as to open into the steel pipe 2 side at a position above the When one end (the exhaust port) is opened on the lower end surface S ₂ of the concrete portion 3 at corners of the steel pipe 2, the other end (outer end) of the side portion of the steel pipe 2 at a position above the lower end surface S ₂ It is substantially L-shaped in side view and substantially U-shaped in plan view so as to open to the side surface of
In a substantially horizontal plane, the upper portion of the vertical portion bends toward the center of the column, and after bending from the inner end in the lateral direction, the portion is bent outward. An air discharge hole 9 is formed.

The compressive force transmitting material injection hole 8 and the air discharge hole 9 are
Although it can also be formed using a melting mold or a blanking mold,
In this example, the pipe is formed by burying a pipe that has been bent into a predetermined shape in advance. The distance between the vertical portion of the pipe forming the compression force transmitting material injection hole 8 and the inner surface of the steel pipe 2 and the distance between the U-shaped bent portion of the pipe forming the air discharge hole 9 and the inner surface of the steel pipe 2 are precast. When the steel pipe concrete column 1 is manufactured, it is set to be sufficiently larger than the maximum diameter of the concrete aggregate so that the concrete is easily filled. still,
A female screw is formed at the outer end of the pipe forming the compression force transmitting material injection hole 8 so that the grout pump can be easily connected to the pipe.

The joining of the precast steel pipe concrete column 1 is performed by the following method. First, the upper and lower precast steel pipe concrete columns 1 are connected to the upper end surface S ₁ of the concrete portion 3 in the lower precast steel pipe concrete column 1.
And a width L of 25 m between the lower end surface S ₂ of the concrete portion 3 of the upper precast steel pipe concrete column 1.
The upper and lower steel pipes 2 are temporarily fixed via the erection piece 6, the connecting plate 10, and the bolts / nuts 11 by arranging them in a state where a gap of m to 35 mm (preferably 30 mm) is formed.

In this state, after correcting the verticality, the steel pipe 2 in the lower precast steel pipe concrete column 1 is removed.
Is welded to the lower end of the steel pipe 2 in the precast steel pipe concrete column 1 on the upper side.

Thereafter, a general grout pump (preferably, a squeeze type pump) such as a snake type pump or a squeeze type pump is used to transmit an example of a compressive force transmitting material from the compressive force transmitting material injection hole 8 to the gap. Non-shrink mortar 1
Inject 2 and fill.

According to the above construction, the upper and lower end surfaces S ₁ and S ₂ of the concrete portion 3 which are opposed to each other are formed in planes perpendicular to the axis of the column, respectively. Is simple, the precast steel pipe concrete column 1 is easy to manufacture, and the upper and lower end surfaces S ₁ and S ₂ are flat and the gap between them is 25 mm.
Because it is set to ~ 35 mm, the non-shrink mortar 12
And the filling time is short.

In particular, since each of the upper and lower end surfaces S ₁ and S ₂ is flat and the gap between them is set to 25 mm to 35 mm, a general grout pump such as a snake pump or a squeeze pump is used. The non-shrink mortar 12 can be easily filled only by the discharge pressure, and it is not necessary to use a complicated vacuum filling method for on-site work, the workability is good, and the porosity (the compressive force transmitting material should be filled) The ratio of the gap to the volume of the gap) can be suppressed to 5% or less.

The corners of the steel pipe 2 are places where air bubbles are most likely to remain, but the four air discharge holes 9 are substantially L in side view.
Because it is a shape that is bent in a U-shape when viewed in plan,
The gas can be exhausted from the corners of the steel pipe 2 without drilling the corners of the steel pipe 2, and the corners become weak points in strength, so that the present invention can also be applied to a case where it is desired to avoid cross-sectional loss due to drilling.

FIG. 5 shows another embodiment, which is characterized in that the present invention is applied to a precast steel pipe concrete column 1 formed by filling concrete into a square tubular steel pipe 2 having a square cross section. The upper and lower surfaces S ₁ perpendicular to the pillar axis,
S ₂ , width L of the gap, arrangement of the compression force transmitting material injection hole 8 and the air discharge hole 9, and other configurations and joining procedures are shown in FIGS.
Since the present embodiment is the same as the embodiment described above, the same reference numerals are given to the same constituent members, and description thereof will be omitted.

[0026]

[0027]

[0028]

In each of the above-described embodiments, the steel pipe 2 in the lower precast steel pipe concrete column 1 is used.
Of the upper end and the upper end surface S ₁ of the concrete portion 3 formed on the same level, the lower end of the steel pipe 2 at the upper side of the precast steel concrete column 1 is projected upward from the lower end surface S ₂ of the concrete section 3, upper, A gap having a predetermined width L was formed between the lower end surfaces S ₁ and S _2. Conversely, as shown in FIG. 6 , the lower end of the steel pipe 2 and the lower part of the concrete part 3 in the upper precast steel pipe concrete column 1 were formed. and an end face S ₂ formed on the same level, even if the upper end of the steel pipe 2 in the precast steel concrete column 1 of lower side to protrude above the upper end surface S ₁ of the concrete portion 3 to form a gap of predetermined width L Further, as shown in FIG. 7 , the ends of the steel pipe 2 in the upper and lower precast steel pipe concrete columns 1 are respectively opposed to the upper and lower end faces S ₁ , S ₂ of the concrete section 3 facing each other.
Alternatively, a gap having a predetermined width L may be formed by projecting by an arbitrary dimension.

Further, the precast steel concrete column 1 for high-rise, as shown in FIG. 8, concrete 3a
In many cases, the steel plate 3b is fixed to the end of the steel plate 3b, and the surface of the steel plate 3b is cut to correct the plane accuracy. In this specification, the concrete part 3 including such a configuration is referred to.

Further, in any of the above-described embodiments, the compressive force transmitting material injection hole 8 is provided in the upper precast steel pipe concrete column 1 as shown in FIG. as shown in FIG. 9, one end (inlet) is open to the upper surface S ₁ of the concrete section 3 in precast steel concrete column 1 of the lower, steel pipe 2 side at a position below the other end the gap It may be formed in a substantially L-shape when viewed from the side so as to open to the side.

Incidentally, according to the experiment, the two types of rectangular precast steel pipe concrete columns 1 shown in FIGS. 2 and 5 were targeted, and one compression force transmitting material injection hole 8 and 4 were respectively used.
The air vent hole 9 of the present, the arrangement shown in FIGS. 2 and 5, on the concrete part 3 facing each lower end surfaces S _1, S ₂
The gap between them was set to 30 mm, and the non-shrinkable mortar 12 was injected at a rate of about 17 liters per minute (with no load) using a squeeze pump. In each case, the porosity was reduced to 2% or less. It was confirmed that it could be suppressed.

The correlation between the porosity and the decrease in the compressive strength of the grout plate formed of the non-shrink mortar 12 was determined by experiments. As a result, when the porosity was 10%, the strength was reduced by about 7% and the porosity was 5%. %, The strength decreases by about 3.5% and the porosity is 2
%, It was confirmed that the strength decreased by about 1.4%. Concrete used for construction of structures generally has a safety factor of 10% or more in strength, so that the porosity is 2%.
The strength reduction of about 1.4% due to the above can be neglected as being within the range of an allowable error. Even if the porosity is 2% or more, if the porosity is 5% or less, the performance of the joint portion is reduced. Is small, and is considered to be sufficiently practical.

[0034]

According to the present invention, a method for joining a precast composite column which is simple and has good workability and which can transmit the force acting on the column within the range required for the structural design is established. You can do it. In particular, according to the invention
This has the following effects. That is, the compressive force transmitting material is filled
Of the gaps, the corners of the square tube-shaped metal tube have the most air bubbles remaining.
Since it is a place where it is easy to hold, when filling the compressive force transmitting material,
It is desirable to configure exhaust from all corners of the pipe.
However, depending on the metal tube, the corner may be a weak point in strength.
In some cases, it is desired to avoid cross-sectional defects due to perforation.
Even in such a case, according to the configuration of the present invention,
The compression force transmitting material injection hole is bent in an approximately L shape when viewed from the side.
With one end in the vicinity of the corner of the metal tube.
At the opposite upper and lower end of the concrete part
Open the other end to the side of the metal tube.
About four air discharge holes provided one by one, side view
The shape is substantially L-shaped and bent into a substantially U-shape in plan view,
One end of the concrete part at the corner of the metal tube
Surface and the other end is above the gap and the metal tube
It is open on the side of the side of the
Without piercing, it can be exhausted from the corner of the metal tube,
Therefore, the corners become weak points in strength (due to drilling)
Cross-sectional defect) can be avoided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part.

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

FIG. 3 is an enlarged vertical sectional view of a main part for explaining an air discharge hole.

FIG. 4 is a side view.

FIG. 5 is a cross-sectional view of a main part showing another embodiment.

FIG. 6 is an essential part for explaining an example of a positional relationship between a gap and a welded portion .
FIG .

FIG. 7 is an enlarged vertical sectional view of a main part illustrating an example of a positional relationship between a gap and a welded portion.

FIG. 8 is an enlarged vertical cross-sectional view of a main part for explaining upper and lower end surfaces of a concrete part .

FIG. 9 is an enlarged vertical cross-sectional view of a main part illustrating an example of a compression force transmitting material injection hole .

[Explanation of symbols]

1 ... precast steel concrete column (an example of a precast composite column), (an example of a metal pipe) 2 ... steel hole, 3 ... concrete unit, 8 ... compressive force transmitting material injection hole, 9 ... air vent hole, S ₁ ... upper surface , S ₂ : lower end face, L: width of gap.

Continuing from the front page (73) Patent holder 000002299 Shimizu Corporation 1-3-2 Shibaura, Minato-ku, Tokyo (73) Patent holder 390037154 Daiwa House Industry Co., Ltd. 3-35 Umeda, Kita-ku, Osaka-shi, Osaka (73) Patent Holder 000003621 Takenaka Corporation 4-1-1, Honcho, Chuo-ku, Osaka-shi, Osaka (73) Patent Holder 000166432 Toda Construction Co., Ltd. 1-7-1, Kyobashi, Chuo-ku, Tokyo (73 Patent holder 000229667 Nippon Hume Co., Ltd. 5-33-11, Shimbashi, Minato-ku, Tokyo (73) Patent holder 000228660 Japan Concrete Industries Co., Ltd. 1-8-27 Konan, Minato-ku, Tokyo (73) Patent holder 000112668 Fujita Co., Ltd. 4- 25-2 Sendagaya, Shibuya-ku, Tokyo (73) Patent holder 000236610 Fudo Construction Co., Ltd. 4-2-1-16 Hirano-cho, Chuo-ku, Osaka-shi, Osaka (73) Patent holder 000201478 Maeda Corporation Company 2-10-26 Fujimi, Chiyoda-ku, Tokyo (73) Patent holder 59908450 0 New City Housing Association 1-16-17 Toranomon, Minato-ku, Tokyo (72) Inventor Souichi Tateyama 3-12-8 Shibaura, Minato-ku, Tokyo Inside Ando Construction Co., Ltd. (72) Inventor Isamu Kunimoto 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo headquarters (72) Inventor Yoshiyuki Era 3-14-4, Narihei, Sumida-ku, Tokyo Inside Okabe Co., Ltd. (72) Inventor Takeshi Kajiyama Tsukuba, Ibaraki 1-20-1 Ichizakura, Konoike-gumi Technical Research Institute, Inc. (72) Noboru Sakaguchi 1-2-3, Shibaura, Minato-ku, Tokyo Inside Shimizu Corporation (72) Inventor Yoshiharu Tanaka 6-6, Sakyo, Nara-shi 2 Daiwa House Industry Co., Ltd. (72) Inventor Tatsuo Okamoto 4-1-13 Honcho, Chuo-ku, Osaka-shi Takenaka Corporation Osaka Main Store (72) Inventor Shigeru Ogi 1-Kitako, Nishi-ku, Yokohama-shi, Kanagawa 11-15 Toda Construction Co., Ltd., Yokohama Branch (72) Inventor Kazuyoshi Tsuda 5-33-11 Shimbashi, Minato-ku, Tokyo Japan Hume Tube Stock Inside the company (72) Inventor Tatsumi Higuchi 1-8-27 Konan, Minato-ku, Tokyo Japan Concrete Co., Ltd. (72) Inventor Jin Kobayashi 2025-1 Ono, Atsugi-shi, Kanagawa Prefecture Inside Fujita Technology Center Co., Ltd. (72) Invention Person Hideki Ito 1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd. (72) Inventor Terutake Imamura 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Umezawa Nobuo 1-3-11 Takinogawa, Kita-ku, Tokyo Kawada Industries Co., Ltd. (72) Inventor Fumiya Osugi 2-1-22 Shiomi, Koto-ku, Tokyo Kume Sekkei Co., Ltd. (72) Inventor Shigehiko Onuki Roppongi, Minato-ku, Tokyo 3-16-26 Inside Pozzolith Bussan Co., Ltd. (72) Inventor Yuji Kumagai 3-23-21 Toyo, Koto-ku, Tokyo Inside Maeda Seisakusho Co., Ltd. Tokyo Branch Office (72) Inventor Yoshika Kano 1--1 Nakase, Mihama-ku, Chiba-shi 9-1 Mitsui Construction Co., Ltd. (56) References JP-A-11-61999 (JP, A) Open flat 5-179759 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) E04B 1/30 E04B 1/58 503

Claims (2)

(57) [Claims] A plurality of precast composite columns formed by filling concrete in a rectangular tubular metal tube are arranged vertically, and the upper end of the metal tube in the lower precast composite column and the upper precast composite column in the upper precast composite column are provided. After welding the lower end of the metal pipe, fill the gap between the upper end surface of the concrete part in the lower precast composite column and the lower end surface of the concrete part in the upper precast composite column with the compressive force transmitting material and harden it. a method of joining pillars, on opposing the concrete part, Rutotomoni lower end surface is formed on a plane perpendicular each pillar axis, compressive force
One transmission material injection hole is formed for one joint, and
One vent per corner for each joint
And four air exhaust holes are formed respectively.
It is formed to be substantially L-shaped in side view and bent in substantially U-shape in plan view.
One end of the air discharge hole is located at the corner of the metal tube.
Open at the lower end face of the concrete part
Above and open to the side of the side of the metal tube,
The compressive force transmitting material injection hole is formed in the upper or lower precast composite column , one end of which is opened at one of the opposed upper and lower end surfaces of the concrete portion in the vicinity of the corner of the metal tube. The other end is formed in a substantially L-shape in a side view so as to open to the side surface of the metal tube at a position above or below the gap.
And injecting the compressive force transmitting material into the gap from the compressive force transmitting material injection hole. 2. A gap between the upper and lower end surfaces of the concrete part.
Method of joining pre-cast composite column according to claim 1, characterized in that you set the 25Mm～35mm.