JP2904683B2 - Column / beam 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 method of joining a reinforced concrete column and a beam, and more particularly, to joining a column main bar embedded in a precast concrete column on upper and lower floors using a sleeve joint. It relates to the method of joining columns and beams that have been made.

[0002]

2. Description of the Related Art As shown in FIG. 7, a column / beam joining method of this type includes a sleeve joint 1 disposed at a lower end and a column main bar 2 inserted halfway through the sleeve joint 1, as shown in FIG. An upper precast concrete column 3 buried inside is inserted into the above-mentioned sleeve joint 1 by inserting a lower-column pillar main bar 2 protruding from the slab surface 4, and then mortar or the like is inserted into each sleeve joint 1. Grout material is injected to join the upper and lower column main bars 2.

As shown in FIG. 8, a column main bar 8 of the column 6 is inserted halfway into a region between beams above the column 6 on the lower floor, that is, the upper end of the panel zone P for column / beam connection. After the sleeve joints 7 are embedded, the main pillars 8 protruding from the lower ends of the columns 6 on the upper floor are inserted into the sleeve joints 7, and the columns 6 on the upper floor are built. Grout material is injected into the upper and lower pillar main bars 8
There are some that are joined.

In any of the above cases, the columns 3 and 6 on the upper floor are erected after the concrete has been poured into the floor including the panel zone P.

As a method of connecting the column main reinforcements of the upper and lower columns in the panel zone, there is also a method using a lap joint in which these column main reinforcements are overlapped with each other by a certain length and connected. The drawback is that the length of the main bar that protrudes from the capital or bottom of the column must be increased by the amount of overlap, which causes inconvenience in transportation and makes it difficult to cast concrete due to an increase in the amount of reinforcing bars in the panel zone. There is. On the other hand, the method using the sleeve joint does not cause the above-described disadvantages due to the use of the lap joint because the main joints of the column are merely abutted but not overlapped in the longitudinal direction. It is expected to be increasingly used.

[0006]

However, the grout material injected into the sleeve joint requires a certain curing period before it hardens sufficiently and develops its strength. Therefore, during that time, the work of building the beams and floor cannot be performed at the top of the built pillar. This is because in a state where the grout material is not sufficiently hardened, the strength of the joint is reduced by the vibration generated by the work.

An object of the present invention is to wait for the grout material injected into the sleeve joint to harden in the column / beam joining method in which the main bars of the upper and lower floors are joined using the sleeve joint. It is an object of the present invention to provide a column and beam joining method with high work efficiency that can perform the next beam and floor laying work.

[0008]

Means for Solving the Problems To achieve the above object, a method of joining columns and beams according to the present invention comprises: a sleeve having an opening at a lower end side at a lower end of a pillar main bar projected from the bottom of a precast concrete column; With fittings installed,
Next, a precast concrete beam is placed on a precast concrete column on the lower floor where the column main bar protrudes from the column capital to form a panel zone for beam-column joints,
Next, in the panel zone, insert the main bar of the precast concrete column on the lower floor into the sleeve joint to build the precast concrete column,
Next, concrete is poured into the panel zone, and then grout is injected into the sleeve joint to join the column main bars of the upper and lower floors.

The grout injection pipe and the discharge pipe can be provided so as to protrude from the inner surface of the formwork of the panel zone. Before casting concrete in, grout injection pipe and grout discharge pipe are attached to the above-mentioned sleeve joint upward, and slab concrete is poured at the same time as concrete is poured into the panel zone,
The grout injection pipe and the grout discharge pipe are characterized in that the tips of the grout injection pipe and the grout discharge pipe protrude from the slab surface on which they are cast.

The grout material may be injected into the sleeve joint after the concrete is cast into the panel zone as described in claim 1. However, in order to further improve the strength of the sleeve joint, the grout material may be injected. The invention described in Item 3 is that, at first, a sleeve joint having an open lower end is attached to a lower end of a pillar main bar protruding from the bottom of a precast concrete column, and then a lower floor in which the pillar main bar protrudes from the capital. On the precast concrete column, a precast concrete beam is mounted so as to form a panel zone for column-beam connection, and then, in the panel zone, the column main reinforcement of the precast concrete column on the lower floor is connected to the sleeve. Insert the joint into the joint and erected the precast concrete column, then cast concrete in the panel zone and By injecting grout into the sleeve joints, it is characterized by joining the upper and lower floors of the column main reinforcement.

According to a fourth aspect of the present invention, in the first or the third aspect of the present invention, a threaded portion is formed at a tip end of a pillar main bar projecting from a capital of the precast concrete pillar on the lower floor, A nut having a diameter equal to or larger than the outer diameter of the sleeve joint is provided on the threaded portion so as to be vertically movable, and a packing material is attached to an upper surface of the nut.

[0012]

According to the present invention, according to the present invention, the joining of the column main bars of the upper and lower floors protruding into the panel zone is performed only by the grout material injected into the sleeve joint. Is carried out by concrete poured into the panel zone after the erection of the upper floor columns and grout material injected into the sleeve joint. Since the grout is injected after the concrete is poured, the main bars of the upper and lower floors are fixed in the panel zone by the hardened concrete at the time of injecting the grout. Therefore, even if the work of building the beam or the floor of the next floor is performed before the grout material does not harden, the strength of the joint is hardly affected by the vibration due to the work. Therefore, once the concrete has hardened, it is possible to perform the work of laying beams and floors on the next floor in parallel with the grouting work. In other words, by using the column / beam joining method of the present invention, the work time can be reduced by the grout material injection work time and the grout material curing period as compared with the conventional method, and the work efficiency is increased. .

According to the second aspect of the present invention, since the tips of the grout injection pipe and the grout discharge pipe project from the slab surface after the concrete is cast, the grout material can be easily connected to the pipe. Further, the grout material can be injected on the slab surface without dismantling the mold. On the other hand, when the ends of the grout injection pipe and the grout discharge pipe are set to the side of the panel zone, connection with the grout material piping is troublesome, and the panel zone form is dismantled. Since the process cannot be performed in the grouting step unless the process is performed, the workability is inferior to that of the present invention.

According to the first aspect of the present invention, the work of laying a beam or a floor on the next floor is performed in a state where the grout material in the sleeve joint is in an uncured state. Will be affected by the vibration. On the other hand, according to the third aspect of the present invention, since the grout is poured together with the concrete, the grout is hardened in parallel with the hardening of the concrete. The setting time of grout and concrete differs depending on the type, but the setting time of grout is generally the same or shorter than that of concrete. Therefore, when the concrete in the panel zone hardens, the grout material in the sleeve joint has also hardened. Therefore, even if the work of building the next floor beam or floor with vibration is performed immediately after the concrete is hardened, the influence of the vibration on the sleeve joint is further reduced as compared with the first aspect of the present invention. Also, higher bonding strength can be obtained. The grouting and curing process is performed in parallel with the concrete placing and curing process.
In addition, since the operation is completed within the casting / curing period, the working time for grout material injection and the grout material curing period are reduced as compared with the conventional construction method.

According to the fourth aspect of the present invention, since the diameter of the nut is equal to or larger than the outer diameter of the sleeve joint, when the threaded portion of the column main bar on the lower floor is inserted into the sleeve joint, each sleeve joint is interposed through the packing material. Supported by the corresponding nut.
Then, by adjusting the position of the nut, the level of the pillar on the upper floor is adjusted. This level adjustment can be performed with only some nuts. Further, the opening of the sleeve joint is sealed by a packing material attached to the upper side of the nut. Therefore, if the concrete is cast before pouring into the grout material, the separated water of the concrete is prevented from entering the sleeve joint, and the grout material is prevented from leaking from the sleeve. The grout material is well filled in the sleeve.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a longitudinal sectional view showing a precast concrete column (hereinafter simply referred to as a column) 10 and a precast concrete beam (hereinafter simply referred to as a beam) 20 joined by the joining method of the present invention. 2 is a cross-sectional view taken along the line II-II of FIG. 1 showing a cross-sectional structure of the panel zone P, and FIG. 3 is an enlarged view of a portion indicated by III in FIG. It is.

The pillar 10 is a full precast pillar, and as shown in FIG. 2, a plurality of pillar main reinforcements 11 are provided along four corners and side wall surfaces.
Is embedded in concrete. Each column main bar 11 protrudes from the column head 10a and the bottom 10b of the column 10, and a threaded portion 11a, 11b is formed at the tip of each protruding portion, as shown in detail in FIG.

A sleeve joint 12 is screwed into a threaded portion 11b of the column main bar 11 projecting from a bottom 10b of the pillar 11 on the upper floor. An axial position of the sleeve joint 12 with respect to the threaded portion 11b is determined by a nut 13. Fixed.

A large-diameter nut 14 having a diameter equal to or larger than the outer diameter of the sleeve joint 12 is provided on the threaded portion 11a of the column main bar 11 protruding from the column capital 10a of the lower floor column 10.
1a so as to be movable along the nut 1a.
A sealing material, that is, a packing material 15 is attached to the upper surface of the fourth member 4.

In the state shown in FIGS. 1 and 3, the threaded portion 11 a of the column main bar 11 on the lower floor is inserted into the sleeve joint 12, and the sleeve joint 12 is connected to the large-diameter nut 14 via the packing material 15. Supported. Packing material 15
Thereby, the lower end which is the open end of the sleeve 12 is sealed.

A grout injection port 16 and a discharge port 17 are formed in the lower and upper portions of the sleeve joint 12, respectively. A grout injection pipe 18 and a grout discharge pipe 19 are attached to these ports 16 and 17, respectively. Have been. The grout injection pipe 18 and the grout discharge pipe 19 are attached before the concrete is poured into the panel zone P after the construction of the pillar 10 on the upper floor is completed, as described later. After the concrete and the slab concrete are poured, the tips of the respective pipes 18 and 19 protrude above the concrete slab surface 30 as shown in FIG.

Hoop bars 33 are arranged at intervals around the column main bars 11 embedded in the concrete of each column 10 as in the panel zon P.

On the other hand, the beam 20 is a full precast as in the case of the column 10, and as shown in FIG.
The main beam 21 at the lower end of the beam projecting in the longitudinal direction from the end face of the beam 20 opposed to the other is partially overlapped in the horizontal direction in the panel zone P, and the tip thereof is bent upward.

In FIG. 1, reference numeral 22 denotes a beam stirrup streak, and reference numeral 40 denotes a column support. The pillar support 40 is a pillar 10
One of the pillar supports 40 is fixed to the pillar 10 by an anchor while the other end 40a is fixed to the pillar 10 at least until the concrete is cast after the erection is completed. It is connected to a metal fitting 41 that has been driven into the concrete of the beam 20.

Next, a method of joining the column 10 and the beam 20 will be described with reference to FIG.

First, the pillar 10 on the lower floor is built. Capital 1
Hoop 33 around column main bar 11 protruding from Oa
Is built before the pillar 10 is built. Each column main bar 11 has a large-diameter nut 14 provided with a packing material 15.
Is attached.

Next, the beam 20 is mounted on the pillar 10 on the lower floor. After that, the pillar 10 on the upper floor is built. As described above, the lower end of the pillar main bar 11 protruding from the bottom 10b of the pillar 10 on the upper floor is provided with a sleeve joint 12 having an open lower end.
Is fixed, and the pillar 10 on the upper floor is built by inserting the main bar 11 on the lower floor into the sleeve joint 12. At this time, the level of the pillar 10 on the upper floor is adjusted by adjusting the positions of the large-diameter nuts 14 at the four corners. The sleeve joints 12 at the four corners are sealed by the packing material 15 at the same time as the level adjustment. When the level adjustment is completed, the other large-diameter nut 14 is rotated to press the packing material 15 against the corresponding sleeve joint 12,
Seal all sleeve joints 12.

As described above, by sealing the sleeve joint 12 with the packing material 15, it is possible to prevent the separated water of concrete from entering the sleeve joint 12 in the later concrete placing step. Further, in the grouting material injection step, it is possible to prevent the grouting material from leaking from the sleeve joint 12.

Next, the injection port 16 of the sleeve joint 12
Further, a grout injection pipe 18 and a grout discharge pipe 19 are attached to the outlet 17 respectively. At this time, the tips of the grout injection pipe 18 and the grout discharge pipe 19 are connected to the concrete floor surface, ie, the slab surface 30, which is subsequently cast.
So that it is more protruding.

Subsequently, the beam upper main reinforcement 23 is passed through the stirrup reinforcement 22 and arranged. Next, a formwork is installed, concrete is poured into the panel zone P, and slab concrete is poured.

After the concrete poured in the above process has hardened, the column support 40 is removed, and a grout pipe 32 is connected to the tip of the grout injection pipe 18 protruding from the concrete slab surface 30, and the grout material is connected. Is injected into the sleeve joint 12. The ends of the grout injection pipe 18 and the grout discharge pipe 19 are on the concrete slab surface 3.
Since it protrudes from 0, the connection of the pipe 32 can be easily performed, and the injection work can be performed without removing the mold, so that the workability is good. Grouting is continued until grout is discharged from the grout discharge pipe 19.

The column support 40 may be removed after the grout material has been cured. This makes it possible to reduce the influence of vibration on the sleeve joint due to the work of erection of the beams and floors of the next floor performed in parallel with grouting and curing.

In this manner, the pillars 10 and the beams 20 on the upper and lower floors are integrated, and their joining is completed. In parallel with the start of the grout material injecting operation in the above step, the above step (mounting of the beam 20) is started above the pillar 10 on the upper floor. This is because, at the time of grouting, the column main bars 11 on the upper and lower floors have already been fixed by the concrete cast in the panel zone P, and even if work involving vibration is performed on the upper part of the column 10, the joint strength is not reduced. This is because it is hard to cause a decrease. As described above, since the next step can be performed in parallel with the grout material injection step, the operation time can be reduced as compared with the above-described conventional joining method.

In the joining method shown in FIG.
Although the grout material injecting step is performed after the concrete placing step, both steps may be performed in parallel. Also in this case, since the grout material injection step is not performed alone, the working time can be shortened as compared with the related art as in the embodiment shown in FIG. Further, since the grout material hardens simultaneously with or earlier than the concrete, at the time when the concrete hardens, the grout material in the sleeve joint 12 has also hardened. Therefore, FIG.
As compared with the embodiment shown in the above, the influence of the vibration of the work of building the next floor beam or floor on the sleeve joint 12 can be further reduced, and the joining strength can be further increased.

In the case of a full-precast beam, such as the beam 20 used in the above embodiment, as shown in FIG. The concrete can be easily poured into the concrete.

In the above embodiment, the pillar 10 is made of full precast concrete. However, as shown in FIG. 6, a hollow outer shell precast pillar may be used. In FIG. 6, as shown in the cross-sectional view taken along the line c-c in FIG. 6, similarly to the above-described embodiment, a plurality of column main reinforcing bars 11 are spaced apart in the circumferential direction in the outer shell concrete. As shown in the sectional view taken along the line d-d, the buried one and the one shown in (b) show the pillar concrete bars 11 embedded only in the four corners of the outer shell concrete. These outer shell precast pillars are lighter than full precast pillars, which makes transporting and building work easier.

The beam 20 may be a full-cast beam used in the above embodiment or a shell precast beam having a U-shaped cross section with an open slab surface. Also in this case, as in the case of the pillar, since the weight is lighter than that of the full precast one, the transfer work and the beam mounting work become easier.

[0039]

As is apparent from the above description, in the column / beam joining method according to the first aspect of the present invention, the pillar main bars are projected from the capitals of the columns on the lower floor, and are projected from the bottoms of the columns on the upper floor. At the lower end of the pillar main reinforcement, attached a sleeve joint with an open bottom end, insert the lower floor pillar main reinforcement into this sleeve joint and erected the upper floor column, and after placing concrete in the panel zone, Since the grout material is injected into the sleeve joint, before the grout material is injected, the column main bars projecting from the columns on the upper and lower floors can be fixed by the hardened concrete in the panel zone. Therefore, even if the work of building the next floor beam or floor is performed before the grout material in the sleeve is hardened, the joint strength is hardly reduced, so in parallel with the grout material injection work,
The next floor beams and floor can be built. In other words, by using the column / beam joining method of the present invention, it is possible to reduce the work time by the grout material injection work time and the grout material curing period as compared with the conventional method,
Work efficiency is increased.

According to the second aspect of the present invention, since the tips of the grout injection pipe and the grout discharge pipe are projected on the slab surface, connection with the grout material pipe is easy, and the mold is not dismantled. The grout material injection work can be started, and the workability is good.

According to the third aspect of the present invention, since the grout material which hardens simultaneously with or sooner than the concrete is poured together with the casting of the concrete, the grout material is injected into the sleeve joint at the same time as or sooner than the hardening of the concrete in the panel zone. The grout material can be hardened, and in the state where the grout material is hardened, the work of building the next floor beam or floor with vibration can be performed. Therefore, the influence of the vibration on the sleeve joint can be further reduced as compared with the invention of claim 1 in which the work of erection of the beam or the floor of the next floor is performed in a state where the grout material is uncured. Also, higher bonding strength can be provided. Also,
The grouting and curing process is performed in parallel with the concrete placing and curing process, and is completed within the casting and curing period. The working time can be shortened by the curing time of the grout material, and the working efficiency is increased.

According to the fourth aspect of the present invention, since the diameter of each nut attached to the column main bar on the lower floor is equal to or larger than the outer diameter of the sleeve joint, the nut can support the sleeve joint. Further, since the nut is vertically movably attached to the threaded portion of the main column bar, by adjusting the position of the nut, the level of the column on the upper floor can be adjusted. This level adjustment can be performed with only some nuts. Furthermore, since the packing material is attached to the upper side of each nut, the opening of each sleeve joint can be sealed by this packing material. Therefore, in the case where the concrete placement is prior to the grout injection, the separated water of concrete can be prevented from entering the sleeve joint, and the grout can be prevented from leaking from the sleeve. Can be filled well.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a precast concrete column and a precast concrete beam joined by a beam-column joint method of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a portion indicated by III in FIG.

FIG. 4 is a process chart illustrating a beam-column joining method of the present invention.

FIG. 5 is a longitudinal sectional view showing a precast concrete column and a precast concrete beam joined by the beam-column joining method of the present invention.

FIG. 6 is a view showing another precast concrete column used in the beam-column jointing method of the present invention.
(B) is a front view of a precast concrete column having different outer shells, (c) is a cross-sectional view taken along line cc of (a), and (d).
FIG. 4 is a dd cross-sectional view of FIG.

FIG. 7 is a longitudinal sectional view showing a precast concrete column and a beam joined by a conventional beam-column joining method.

FIG. 8 is a longitudinal sectional view showing a precast concrete column and a beam joined by another conventional beam-and-column joining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Precast concrete pillar, 11 ... Column main reinforcement, 11a, 11b ... Threaded part, 12 ... Sleeve joint, 13 ... Nut, 14 ... Large diameter nut, 15 ... Packing material, 16 ... Injection port, 17 ... Discharge port, 18 ... grout injection pipe, 19 ... grout discharge pipe, 20 ... precast concrete beam, 21 ... main beam bottom reinforcement, 22 ... stirrup reinforcement, 23 ... main beam upper reinforcement, 24 ... notch, 30 ... concrete slab surface, 32 ... Grout material piping, 33: hoop streak, 40: pillar support P: panel zone.

Claims (4)

(57) [Claims] First, a sleeve joint having an opening at a lower end side is attached to a lower end of a pillar main bar protruding from the bottom of a precast concrete column. A precast concrete beam is mounted on the column so as to form a panel zone for beam-column connection, and then, in the panel zone, a main bar of the lower precast concrete column is inserted into the sleeve joint. The precast concrete pillars are erected in the above, then concrete is poured into the panel zone, and then grout material is injected into the sleeve joints to join the column reinforcements of the upper and lower floors. Column / beam joining method. 2. A method according to claim 1, wherein a grout injection pipe and a grout discharge pipe are attached upward to the sleeve joint before concrete is poured into the panel zone. Pour slab concrete at the same time as concrete in the zone,
A method of joining columns and beams, characterized in that tips of the grout injection pipe and the grout discharge pipe protrude from the surface of the slab cast. 3. A sleeve joint having an open lower end is attached to a lower end of a column main bar projected from the bottom of a precast concrete column. A precast concrete beam is mounted on the column so as to form a panel zone for beam-column connection, and then, in the panel zone, a main bar of the lower precast concrete column is inserted into the sleeve joint. Then, the precast concrete columns are erected, and then concrete is poured into the panel zone, grout material is injected into the sleeve joints, and the column main bars of the upper and lower floors are joined. Column / beam joining method. 4. The method according to claim 1, wherein a threaded portion is formed at a tip end of a pillar main bar protruding from a capital of the precast concrete pillar on the lower floor, and the sleeve joint is formed. A nut having a diameter equal to or larger than the outer diameter of the nut is provided on the threaded portion so as to be vertically movable, and a packing material is attached to an upper surface of the nut.