JPH0842064A - Building method of reinforced cage for column and building jig - Google Patents

Abstract

PURPOSE:To shorten the suspension time of a crane when a reinforced cage for a column is built. CONSTITUTION:Building jigs 50 are set previously to the screw reinforcing bars 21 of a concrete structure. Slits 54, 55 are formed in the lower-side horizontal plate sections and upper-side horizontal plate sections of the building jigs 50 respectively. The horizontal plate sections are held and bone by coupler nuts 30 and first locknuts 31 screwed to the screw reinforcing bars 21 under the state that the screw reinforcing bars 21 are stored in the slits 54 of the lower-side horizontal plate sections. A reinforced cage 10 for a column is hung down by a crane 100, the screw reinforcing bars 11 of the reinforced cage 10 are passed through the slits 55 of the upper-side horizontal plate sections, previously screwed second locknuts 32 are placed on the upper-side horizontal plates, and the reinforced cage 10 for the column is self-supported. The suspended state by the crane is released, the screw reinforcing bars 11, 21 are connected by the coupler nuts 30, the building jigs 50 are extracted, and both locknuts 31, 32 are clamped to the coupler nuts 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a rebar cage for a column and a jig used for this installation.

[0002]

2. Description of the Related Art Reinforcing bar cages for columns are constructed by arranging shear reinforcing bars around a plurality of main bars. This pillar rebar cage is constructed by connecting the lower end of the main bar to the upper end of the main bar of the pillar rebar basket on the lower floor. In addition,
Concrete has already been cast into the rebar cage for columns on the lower floors to form a concrete structure. As a method of connecting the main bars to each other, there is a method of using screw connection. More specifically, the main bars of the upper and lower pillar reinforcing bar cages are screw reinforcing bars (reinforcing bars having screw bushes on the outer circumference). The screw rebars are connected to each other by a coupler nut, and both sides of the coupler nut are tightened by a pair of lock nuts.

In the above-described method of constructing a column reinforcing rod basket, first, lock nuts are respectively screwed into the column reinforcing rod baskets and the screw reinforcing rods of the concrete structure, and the coupler nut is screwed into either one of the screw reinforcing rods. I will let you. Then, the rebar cage for columns is suspended by a crane, transported to just above the concrete structure, and further lowered to bring both screw rebars close to each other. In this suspended state, half of the coupler nut screwed to one screw rebar is screwed to the other screw rebar while the upper screw rebar is positioned on the same straight line as the lower screw rebar. When the connection of all the screw rebars with the coupler nuts is completed, the suspended state of the column rebar cage by the crane is released. After that, the lock nuts screwed to the respective screw reinforcing bars are tightened toward the coupler nuts, whereby the installation of the column reinforcing bar cage is completed.

[0004]

However, in the above-mentioned installation method, it is necessary to maintain the suspended state of the column reinforcing bar basket by the crane until the connection of the screw reinforcing bars by the coupler nut is completed. Moreover, since the connection by the coupler nut involves the work of adjusting the pitch between the screw rebars, the hanging time becomes long. As a result, it took a long time to use the crane for building the rebar cage for each column, and the efficiency of using the crane was poor.

[0005]

In order to solve the above-mentioned problems, in the method for installing a pillar reinforcing bar basket according to claim 1, a coupler nut is screwed in advance to a screw reinforcing bar of a concrete structure,
In the state where the auxiliary nut is screwed into the screw reinforcing bar of the column reinforcing bar cage in advance, the column reinforcing bar basket is hung, and the screw reinforcing bar of the column reinforcing bar cage is positioned on the same straight line as the screw reinforcing bar of the concrete structure, In the horizontal placement part of the installation jig installed in the concrete structure, the screw reinforcement of the pillar rebar basket is penetrated and the auxiliary nut is placed, so that the pillar rebar cage is self-supporting, and after this self-supporting, the coupler nut is attached. It is characterized in that it is moved upward and the two screw rebars are connected by this coupler nut. In claim 2, by rotating the auxiliary nut on the installation jig, the screw reinforcing bar of the pillar reinforcing bar basket is moved up and down, and the pitch of the screw reinforcing bar of the column reinforcing bar cage is adjusted with respect to the screw reinforcing bar of the concrete structure. It is characterized by In Claim 3, the screw lock of the concrete structure is preliminarily screwed with the coupler nut and the first lock nut arranged below the coupler nut, and the auxiliary nut is screwed with the screw rebar of the pillar rebar basket in advance. Is provided as a second lock nut, and the erection jig is provided with a lower horizontal plate portion having a first slit, and an upper portion as the horizontal mounting portion having a second slit parallel to the first slit. A horizontal flat plate portion and a connecting portion for connecting both horizontal plate portions are provided, and in the state where the screw rebar of the concrete structure is fitted in the first slit of the lower horizontal plate portion of the above-mentioned installation jig, By sandwiching the side horizontal plate portion with the coupler nut and the first lock nut, the building jig is set in advance, and in this set state, the upper horizontal plate portion of the upper horizontal plate portion arranged above the screw rebar of the concrete structure is set. Pillar in slit Insert the second lock nut on the upper horizontal plate through the threaded rebar of the rebar cage to make the rebar cage for columns self-supporting. After that, connect the two threaded rebars with a coupler nut, and then repair the construction. The tool is characterized in that the tool is horizontally moved and pulled out from the screw rebars of both, and finally, the first and second lock nuts are tightened toward the coupler nut. Further, in the construction jig according to claim 4, (a) a first slit which is supported by being sandwiched between the coupler nut and a first lock nut below the coupler nut, and which accommodates a screw rebar of a concrete structure in a removable manner. A lower horizontal plate portion having, and (b) a second slit which is parallel to the first slit and accommodates a screw reinforcing bar of a column reinforcing bar basket so that the reinforcing bar can be inserted and removed, and the second lock nut is placed and supported. And (c) a connecting portion that connects the lower horizontal plate portion and the upper horizontal plate portion to each other.

[0006]

According to the erection method of claim 1, after the auxiliary nut screwed to the screw rebar of the column rebar cage is placed on the erection jig to be self-supporting, the rebar of the concrete structure and the column rebar are reinforced. In the work of connecting the screw rebar of the basket with the coupler nut, it is not necessary to hang the pillar rebar basket by a crane or the like, and the suspended state can be quickly released. Therefore, the usage time of the crane or the like for hanging can be significantly reduced. According to the erection method of claim 2, by rotating the auxiliary nut on the erection jig, the screw rebar can be moved in the vertical direction by a small amount, and the screw rebar of the concrete structure and the screw of the column rebar cage can be moved. You can easily adjust the pitch of the reinforcing bars. According to the installation method and the installation jig of claims 3 and 4, the installation jig can be set by the coupler nut and the first lock nut, and the positioning of the installation jig can be performed easily. . Further, by inserting the screw reinforcing bar of the column reinforcing bar cage into the second slit of the upper horizontal plate portion of the installation jig, the positioning of the screw reinforcing bar can be easily performed. Furthermore, after connecting the screw rebars with each other by the coupler nut, it can be pulled out from the screw rebars by horizontally moving the installation jig, and the subsequent tightening work with the lock nut can be performed without any trouble.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for installing a column reinforcing rod cage according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the rebar cage for pillars 10 to be installed is composed of a plurality of, for example, four screw rebars 11 (main bars) that are parallel to each other, and a space along the screw rebars 11 arranged around the screw rebars 11. It is configured by connecting a number of shear reinforcement bars 12 arranged in advance with a numbered wire. On the other hand, the lower pillar rebar basket has the same structure as the above pillar rebar basket and is already embedded in the concrete, and from this concrete structure 20, the screw rebar 21 of the lower pillar rebar basket is vertically upward. It is protruding.

Prior to the installation work described later, FIGS.
As shown in (1), a coupler nut 30 is previously screwed into the threaded reinforcing bar 21, and a first lock nut 31 is screwed below the coupler nut 30. A second lock nut 32 is screwed onto the screw reinforcing bar 11 of the column reinforcing bar cage 10.

A feature of the present invention is that the construction jig 50 is used in the construction work. As shown best in FIG. 6, the installation jig 50 includes a lower horizontal plate portion 51, an upper horizontal plate portion 52 (horizontal mounting portion), and a vertical plate portion 53 (connecting portion). Part) and has a U-shape. First and second slits 54 and 55 of the same shape which are parallel to each other are formed in the horizontal flat plate portions 51 and 52.
These slits 54, 55 are the above-mentioned screw rebars 11, 21.
Has a width substantially equal to the outer diameter of the horizontal plate portions 51, 5
2 has an opening at the front end edge thereof, and the rear end portions 54a and 55a thereof have a semi-cylindrical surface.

The installation jig 50 is set on the screw rebar 21 in advance before the installation work. More specifically, as shown by the imaginary line in FIG. 6, the screw rebar 21 is housed in the rear end portion 54a of the slit 54 of the lower horizontal plate portion 51, and the horizontal plate portion 51 is connected to the coupler nut 30 and the first lock. Nut 3
Tighten and pinch with 1. As a result, the upper horizontal plate portion 52 is horizontally arranged above the screw reinforcing bar 21. The installation jig 50 is set on all of the four screw rebars 21 as shown in FIGS. In addition, it is preferable that the slits 55 of the upper horizontal plate portions 52 of all the installation jigs 50 are parallel to each other.

After the installation jig 50 is set as described above, the pillar rebar cage 10 is hung by the hook 100 of the crane as shown in FIGS. 1 and 2 and conveyed to above the screw rebar 21. . Then, as shown by an imaginary line in FIG. 2, the pillar rebar cage 10 is lowered to form the screw rebar 1 of the pillar rebar cage 10
1 is accommodated in the slit 55 of the upper horizontal plate portion 52 of the installation jig 50, and the second lock nut 32 screwed to the screw rebar 11 is placed on the upper surface of the upper horizontal plate portion 52. At this time, as best shown in FIG. 7, the screw reinforcing bar 11 is aligned with the screw reinforcing bar 21 by aligning the screw reinforcing bar 11 with the rear end portion 55 a of the slit 55.

As described above, the second lock nut 32 screwed onto the four screw rebars 11 is mounted on the upper horizontal plate portion 52 of the installation jig 50 set on the four screw rebars 21. Thereby, the rebar cage 10 for columns becomes independent. Since the screwing position of the second lock nut 32 with respect to the screw reinforcing bar 11 is away from the lower end of the screw reinforcing bar 11 by a predetermined distance, the column reinforcing bar cage 10 is vertically independent. Further, the mounting position of the installation jig 50 with respect to the screw reinforcing bar 21 is also determined, and the interval S between the lower end surface of the main bar 11 of the pillar reinforcing bar cage 10 and the upper end surface of the screw reinforcing bar 21 is a determined minute amount. can do.

After the pillar rebar cage 10 is self-supporting, the pillar rebar cage 10 is released from the suspended state by the crane,
The state shown in FIG. 3 is obtained. In this state, by rotating the second lock nut 32, the screw reinforcing bar 11 is moved up and down by a small amount to match the pitch with the screw reinforcing bar 21. Next, as shown in FIG. 4, the coupler nut 30 is rotated and moved upward, and half of the nut is screwed into the lower end portion of the screw reinforcing bar 11 of the column reinforcing bar basket 10.

Then, as shown in FIG.
Is horizontally moved in the extending direction of the slits 54 and 55, so that it is pulled out from the screw rebars 11 and 21. Prior to this withdrawal, the lock nut 1 is in contact with the lower surface of the horizontal plate portion 51 and the upper surface of the horizontal plate portion 52 of the installation jig 50, respectively.
It is preferable to loosen either one of 1 and 21 in the direction away from the installation jig 50.

Next, the lock nuts 31 and 32 are moved toward the coupler nut 30 and fastened to the upper and lower end surfaces thereof. As a result, a strong connection between the screw rebars 11 and 21 is obtained, and the building of the column reinforcing bar cage 10 is completed. After this construction is completed, concrete is placed and the rebar cage for columns 10
Embedded in concrete.

The present invention is not limited to the above embodiment, but various modes are possible. For example, the installation jig is screw rebar 21
It may be placed on the upper surface of the concrete structure 20 instead of being set on. Further, the horizontal plate portion of the installation jig may have a hole for passing the threaded reinforcing bar of the column reinforcing bar cage and may not be able to be pulled out from the threaded reinforcing bar. In this case, it is embedded in concrete together with screw reinforcement. Instead of tightening both ends of the coupler nut with lock nuts, the coupler nut may be filled with grout material to enhance the connection strength.

[0017]

As described above, according to the method of erection of the column reinforcing bar basket of claim 1, the column reinforcing bar basket is made to stand by itself using the erection jig. In the work of connecting the screw rebar of No. 2 and the screw rebar of the pillar rebar cage by the coupler nut, it is not necessary to hang the pillar rebar cage by a crane or the like, and the usage time of the crane or the like can be greatly reduced. According to the erection method of claim 2, by turning the auxiliary nut, it is possible to easily perform pitch alignment between the screw reinforcing bars of the concrete structure and the screw reinforcing bars of the column reinforcing bar cage. According to the installation method and the installation jig of claims 3 and 4, the installation jig can be easily positioned. Further, the positioning of the screw reinforcing bars of the pillar reinforcing bar cage can be easily performed. Furthermore, after connecting the screw rebars with each other by the coupler nut, it can be pulled out from the screw rebars by horizontally moving the installation jig, and the subsequent tightening work with the lock nut can be performed without any trouble.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first step of an embodiment of a method for installing a column reinforcing rod cage according to the present invention.

FIG. 2 is a side view of a first step of the example.

FIG. 3 is a side view of a second step of the same example.

FIG. 4 is a side view of a third step of the same example.

FIG. 5 is a side view of a fourth step of the same example.

FIG. 6 is an enlarged perspective view of a main part showing a construction jig and a coupler nut and a first lock nut which are screwed to a screw reinforcing bar of a concrete structure used in the embodiment.

FIG. 7 is an enlarged perspective view of an essential part of a column reinforcing bar basket in an independent state.

[Explanation of symbols]

 10… Reinforcement basket for pillar 11… Screw rebar 20… Concrete structure 21… Screw rebar 30… Coupler nut 31… First lock nut 32… Second lock nut 50… Installation jig 51… Lower horizontal plate 52… Upper horizontal plate portion (horizontal placement portion) 53 ... Vertical plate portion (connection portion) 54 ... First slit 55 ... Second slit

Claims (4)

[Claims] 1. A rebar cage for a column including a plurality of screw rebars as main bars is disposed above a concrete structure including a plurality of screw rebars projecting upward, and a rebar cage for a column rebar and a concrete rebar By connecting with the screw rebar,
In the method of constructing a rebar cage for a column, a coupler nut is screwed in advance to a screw rebar of a concrete structure, an auxiliary nut is screwed in advance to a screw rebar of a column rebar basket, and a rebar cage for a column is suspended. With the screw rebar of the pillar rebar cage positioned on the same straight line as the screw rebar of the concrete structure, place the screw rebar of the pillar rebar cage on the horizontal placement part of the installation jig installed in the concrete structure. By penetrating and mounting an auxiliary nut, the pillar rebar cage can be made self-supporting, and after this self-supporting, the coupler nut can be moved upward,
A method for constructing a column reinforcing rod cage, characterized in that the screw nuts of the both are connected by this coupler nut. 2. The pitch adjustment of the screw rebar of the pillar rebar basket with respect to the screw rebar of the concrete structure is performed by rotating the auxiliary nut on the installation jig to raise and lower the screw rebar of the pillar rebar basket. The method for constructing a rebar cage for a pillar according to claim 1, wherein. 3. A first lock nut, which is arranged below the coupler nut together with a coupler nut, is previously screwed to the screw rebar of the concrete structure, and the auxiliary nut is pre-threaded to the screw rebar of the pillar rebar basket. Is provided as a second lock nut, and the erection jig is provided with a lower horizontal plate portion having a first slit, and an upper portion as the horizontal mounting portion having a second slit parallel to the first slit. Horizontal plate part,
And a connecting portion that connects both horizontal plate portions, and in a state in which the screw rebar of the concrete structure is fitted in the first slit of the lower horizontal plate portion of the above-mentioned installation jig, this lower horizontal plate portion The building jig is set in advance by sandwiching it with the coupler nut and the first lock nut, and in this set state, the pillar rebar is inserted into the slit of the upper horizontal plate portion located above the screw rebar of the concrete structure. Insert the second lock nut on the upper horizontal plate through the screw rebar of the basket to make the rebar basket for columns self-supporting. After that, connect the two screw rebars with the coupler nut, and then install the jig. 3. The column reinforcing bar cage according to claim 1, wherein the first and second lock nuts are finally tightened toward the coupler nut by horizontally moving the screw and pulling out from the two screw reinforcing bars. Installation method. 4. A column reinforcing bar cage including a plurality of screw reinforcing bars as main bars is arranged above a concrete structure including a plurality of upwardly projecting screw reinforcing bars, and the column reinforcing bar cage screw reinforcing bars and the concrete structure are A screw nut and a coupler nut, which is screwed in advance to the screw rebar of the concrete structure, and the first
A building jig used when building a pillar reinforcing bar basket by connecting the lock nut and a second lock nut screwed to a screw reinforcing bar of the pillar reinforcing bar cage, which comprises: ) A lower horizontal plate portion which is supported by being sandwiched between the coupler nut and a first lock nut below the coupler nut, and which has a first slit for accommodating a screw rebar of a concrete structure in a removable manner; An upper horizontal plate portion that has a second slit that is parallel to the first slit and that accommodates a screw rebar of a rebar cage for a pillar so that the rebar can be inserted and removed, and (c) a lower side A connecting jig, comprising: a connecting portion that connects the horizontal plate portion and the upper horizontal plate portion.