JP3861017B2 - Column beam joint construction method - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method for constructing a column beam joint including a beam made of a precast concrete member and a column made of cast-in-place concrete.
[0002]
[Prior art]
A construction method for constructing a column beam frame using a precast concrete column member and a precast concrete beam member has been conventionally known. For example, Japanese Patent Laid-Open No. 2000-336747 discloses construction of a column beam joint portion using a precast concrete member. A method is described. In the construction method described in this publication, as shown in the elevation view of FIG. 6, the bracket 3 is fixed to the upper end of the column member 1A on the lower floor side, and the height adjusting member 4 attached to the bracket 3 is fixed. While the beam members 2A and 2B are placed and supported on the upper side, the beam main bars are connected to each other. At this time, the main bars of the upper and lower column members 1A and 1B are connected to each other at a position lower than the lower main bars of the beam members 2A and 2B until the upper column member 1B is dropped. During this period, a state where the column main bars do not exist in the joint portion is created. Therefore, the beam main bars are connected to each other at this joint portion, or the reinforcing bar reinforcement work is performed.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional construction method, when performing the reinforcement work of the shear reinforcement bars or the connection work of the main reinforcements at the beam-column joints, the worker manually moves from below through the gap between the bracket 3 and the height adjustment material 4. However, there is a drawback that the workability cannot be improved sufficiently because it is necessary to put the hand into the work from above the beam members 2A and 2B.
[0004]
In order to eliminate this drawback, it is conceivable to shorten the column member 1A on the lower floor side and lower the concrete upper end surface in order to make a sufficient gap in the beam-column joint. Formwork work at the beam joint increases and the amount of on-site concrete increases, resulting in a new drawback that goes against the purpose of precasting, which is the efficiency of construction.
[0005]
The present invention has been made in order to solve the above-mentioned problems, and the task is to efficiently perform operations such as connection between the main bars of the columns and beams at the beam-column joint, and arrangement of the shear reinforcement bars. It is in providing the construction method of the beam-column joint which can be performed to.
[0006]
[Means for Solving the Problems]
According to the present invention, a beam member of a precast concrete in which the lower end main bar and the lower part of the lower bar are embedded in the concrete and both ends of the lower main bar protrude from the end surface of the concrete, and the column including the main bar and the band bar. A method of constructing a column beam joint using a reinforcing bar assembly, the step of disposing a predetermined number of bars in a state of being vertically movable at the upper end of the column reinforcing bar assembly on the lower floor side; A process of connecting the upper and lower main bars of the beam member to each other on the upper floor side after both the processes, while supporting the beam members facing each other above the column reinforcing bar assembly and supporting them. A step of dropping a lower end portion of the main reinforcing bar of the column reinforcing bar assembly onto the column reinforcing bar assembly on the lower floor side, and moving a predetermined number of the reinforcing bars in a vertically movable state upward to move the lower end of the beam member A work space is formed below the main bar, and the work space is Construction method of Column Joints characterized by comprising a step of connecting together the pillar main reinforcement of the upper and lower both are provided in.
[0007]
In the present invention, since the column is constructed with the cast-in-place concrete using the reinforcing bar assembly, it is possible to wrap the strip around the main bar at the upper end of the reinforcing bar assembly so that it can move up and down. It becomes possible, and a sufficient gap can be created between the lower surface of the beam member and the upper end of the column rebar assembly by moving the band up and down as necessary. Further, in the present invention, since the beam member is supported by the support work, it is not necessary to provide a bracket or a height adjusting member as in the conventional construction method described above. Space can be secured, and work such as shear reinforcement reinforcement connection and main reinforcement connection can be performed efficiently.
The present invention does not use a precast concrete member for constructing a column as in the conventional construction method described above, but is constructed by a reinforcing bar assembly, formwork, cast-in-place concrete, etc. Due to the good workability in the part and the reduction of material cost by not using the precast concrete member as the column member, both the construction period and the cost are comparable as compared with the conventional construction method.
[0008]
In the present invention, a mark indicating the pre-positioned position of the precast concrete beam member is provided in advance on the lower floor slab, and a mark corresponding to the mark on the floor slab is provided in advance in the support work and the precast concrete beam member is provided in advance. After providing a guide member that regulates the arrangement when placing, and positioning the support using the marks, the precast concrete beam member is placed on the support in the direction of the column beam joint. You may comprise so that the process to move may be included.
[0009]
【Example】
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
[0010]
FIG. 1 is a simplified diagram showing one step in the method of constructing a column beam joint of the present invention.
As shown in FIG. 1, the construction method of the present invention is to construct a beam-column joint using precast concrete members 10A, 10B, 10C for the beams and reinforcing bar assemblies 20A, 20B for the columns. That is, the beam members 10A, 10B, and 10C of precast concrete are manufactured by embedding the lower end main reinforcement 12 and the rib lower part 13 in the concrete and projecting both ends of the lower end main reinforcement 12 from the end surface of the concrete. The column reinforcing bars assemblies 20A and 20B are formed by winding the band 23 around the outer periphery excluding the upper and lower ends of the main reinforcing bar 21 and fixing it.
[0011]
In FIG. 1, only the portion of the column reinforcing bar assembly 20 </ b> A protruding on the floor slab 41 is illustrated, but the lower end portion thereof is already connected to the column on the lower floor side and embedded in the cast-in-place concrete. Yes.
On the floor slab 41, ink marks are preliminarily printed as marks indicating the pre-positioned positions of the precast concrete beam members 10A, 10B, 10C, while the support works 33 are arranged so as to correspond to the marks on the floor slab 41. Also have a mark in advance. Further, the support 33 is provided with a guide member 34 that defines the arrangement when the precast concrete beam members 10A, 10B, and 10C are placed.
First, the support work 33 itself is positioned while being aligned with the mark on the floor slab 41, and then the precast concrete beam members 10A10B and 10C are placed on the support work 33 while being adjusted to the guide member 34 using a lifting machine such as a crane. It is suspended and moved in the lateral direction so that the ends of the upper main bar 11 and the lower main bar 12 are arranged at predetermined positions of the beam-column joint. Then, the upper main bars 11 and the lower main bars 12 that are opposed to each other are coupled to each other by a coupling member 15 such as a coupler or a nut.
At this time, members other than the upper main bar 11 and the lower main bar 12 of the precast concrete beam members 10A, 10B, and 10C are not arranged at the column beam joint, and the main bar 21 of the column reinforcing bar assemblies 20A and 20B. , 24 are arranged below the lower surfaces of the beam members 10A, 10B, 10C, so that a sufficient working space can be secured in the column beam joint. Therefore, it is possible to easily perform the joining operation of the upper main bar 11 and the lower main bar 12 from either the upper side or the lower side.
In addition, although illustration was abbreviate | omitted in FIGS. 1-4 for easy understanding, also from the direction orthogonal to these precast concrete beam members 10A, 10B, and 10C as needed in each junction part, A beam member is appropriately disposed in the same process as described above, and the main bars facing each other are joined to each other.
[0012]
The pre-cast concrete beam members 10A, 10B, 10C are arranged before or after the arrangement / bonding step or simultaneously with the arrangement step of the band 22. That is, a plurality of jacks 31 are arranged around the column reinforcing bar assembly 20A, a support member 32 is provided in a portion where the upper end of the column reinforcing bar assembly 20A is not provided, and the support member 32 is moved downward. Are supported by a jack 31, and are arranged so as to be supported from the upper end 21 of the main reinforcement of the column reinforcing bar assembly 20A and supported by a support member 32. Thus, as long as it does not come into contact with other reinforcing bars, the plurality of rebars 22 are arranged so as to be movable up and down, and if the jack 31 is extended, the plurality of rebars 22 can be moved upward, In addition, if the jack 31 is contracted, the plurality of straps 22 can be moved downward.
[0013]
When the above-described precast concrete beam member arrangement / bonding step and the reinforcing bar arrangement step are finished, the upper-level column reinforcing bar assembly 20B is suspended from the beam-to-column joint by a lifting machine such as a crane, The lower bar lower end portion of the upper bar reinforcing bar assembly 20B is arranged so as to face the upper end of the main bar 21 of the lower bar reinforcing bar assembly 20A.
Here, a covering member 25 as shown in FIG. 5 is fitted in advance to the lower end portion of the main reinforcing bar 24 of the column reinforcing bar assembly 20B on the upper floor side. The covering member 25 is formed of a material having good sliding property such as a synthetic resin, and the lower end 25a is formed in a sharp shape, and includes an engaging portion 25b that engages with a thread of the main muscle 24. Yes. Accordingly, when the lower-layer column reinforcing bar assembly 20B is suspended from the beam-column joint, the covering member 25 slides even if the lower end of the main reinforcing bar 24 comes into contact with other reinforcing bars. The column reinforcing bar assembly 20B is guided to a predetermined position without being grasped.
[0014]
As shown in FIG. 3, the jack 31 is extended to move the plurality of reinforcing bars 22 upward while supporting the column reinforcing bar assembly 20 </ b> B on the upper floor side in a suspended state. As a result, there is a space in which only the column main reinforcement 21 exists and no band 22 exists at the upper end of the column reinforcing bar assembly 20A on the lower floor side below the support member 32. The work is performed using this space, and the lower end of the main bar 24 of the upper column side reinforcing bar assembly 20B and the upper end of the main bar 21 of the lower column side reinforcing bar assembly 20A are coupled with a coupler or a nut. The members 26 are joined.
[0015]
When the joining work of the column main bars 21 and 24 is finished, the jack 31 and the support member 32 are removed, and the band 22 is fixed around the main bars 21 and 24 of the column reinforcing bar assemblies 20A and 20B with wires or the like. Reinforcing bars such as other strips and stirrups are provided at the beam joint. Although not shown in the drawing, a formwork is built around the column reinforcing bar assembly 20A on the lower floor side or in the column beam joint, and concrete is placed in the column, beam, and column beam joint. If the mold is removed after the concrete has hardened, the construction of the beam-column joint is completed.
[0016]
【The invention's effect】
In the present invention, the column is constructed with a reinforcing bar assembly and cast-in-place concrete, the beam uses a precast concrete member to form a column beam joint, and at the upper end of the reinforcing bar assembly, the strip can be moved up and down. Enclose around the main bars and move the straps up and down as necessary to create a sufficient gap between the lower surface of the beam member and the upper end of the column rebar assembly. Since the main bars are joined, compared to the conventional construction method, that is, the construction method in which both column beams are constructed with precast concrete members, the work of connecting the main bars and the reinforcement of the shear reinforcement bars is markedly different. Can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a simplified diagram showing one step in a method for constructing a beam-column joint of the present invention.
FIG. 2 is a simplified diagram showing a step that follows the step of FIG.
3 is a simplified diagram showing a step that follows the step of FIG. 2. FIG.
4 is a simplified diagram showing a step that follows the step of FIG. 3. FIG.
FIG. 5 is a side view of the covering member fitted to the lower end of the main reinforcing bar of the column reinforcing bar assembly.
FIG. 6 is an elevational view showing a conventional example.
[Explanation of symbols]
10A, 10B, 10C Beam member 11 of precast concrete Upper main bar 12 Lower main bar 13 Stirrup bars 20A, 20B Reinforcing bar assemblies 21, 24 Column main bars 22 Band bars (band bars arranged in a movable state)
23 Belt muscle

Claims (3)

Using a precast concrete beam member made by embedding the bottom main bar and the lower part of the lower bar in the concrete, with both ends of the lower main bar protruding from the end surface of the concrete, and a column rebar assembly with the main bar and strip A method of constructing a beam-to-column joint by disposing a predetermined number of bars in a state of being vertically movable at the upper end of the column reinforcing bar assembly on the lower floor side, and the column reinforcing bar assembly The upper and lower main bars of the beam member are connected to each other while the beam members are opposed to each other and supported by a supporting work, and the upper-stage column reinforcing bar assembly is connected after both the steps. The process of dropping the lower end of the main bar onto the lower column side bar rebar assembly, and moving the predetermined number of bars in the up and down movable state upward to work below the lower main bar of the beam member Forming a space, and Construction method of Column Joints characterized by comprising a step of connecting the pillar main reinforcement together. When the precast concrete beam member is preliminarily provided with a mark on the lower floor slab, a mark corresponding to the mark on the floor slab is preliminarily provided and the precast concrete beam member is placed. A step of providing a guide member for prescribing the arrangement, positioning the supporting work using the both marks, and placing the precast concrete beam member on the supporting work and moving it in the direction of the column beam joint portion. The method of constructing a beam-column joint according to claim 1, comprising: A covering member is provided at the lower end portion of the main reinforcing bar of the column reinforcing bar assembly to prevent it from coming into contact with other reinforcing bars when dropped onto the column reinforcing bar assembly on the lower floor side. The construction method of the beam-column joint part according to claim 1 or 2, characterized by the above-mentioned.

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