JPS6065856A - Connection of iron wire unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wall reinforcement unit assembled using a large number of threaded reinforcing bars, a wall reinforcement unit for forming a wall body, a pile reinforcement unit for forming cast-in-place piles called a reinforcing bar cage, etc. This relates to a method of connecting reinforcing bar units to connect vertically.

Recently, in order to save labor and improve the efficiency of reinforcing reinforcement work in large-scale reinforced concrete structures, we have begun producing units of reinforced concrete structures in which groups of reinforcing bars such as wall reinforcements, pile reinforcements, and column reinforcements are preassembled in factories. The construction method used is to assemble these reinforcing bar units by connecting them vertically, horizontally, and vertically on site. Further, as the reinforcing bars used in the rebar units, threaded reinforcing bars that can be connected by threaded joints are often used. However, the following problem has arisen when reinforcing bar units using threaded reinforcing bars are vertically connected using threaded joints at the ends of each vertical bar.

That is, this type of threaded joint, as shown in Fig. 6,
A coupler a with a female thread, a pair of rotary screws) b,
c, and the vertical bars d, of both reinforcing bar units to be connected.
Screw the coupler a across the opposite ends of d2,
In addition, both vertical bars d1 and d2 are connected by tightening lock nano) b and c, which have been previously screwed onto both reinforcing bars d, and d2, and pressing them against both end faces of coupler a. . When using this threaded joint connection method, both reinforcing bars d1
．． The axes of d2 are aligned, and both longitudinal stripes d,
There is no discrepancy in the thread pitch between d2 and coupler a (screw coupler a into both vertical strips d, d2 at the same time)
is a necessary condition. However, as a practical matter, it is difficult to satisfy these two conditions for all longitudinal bars of reinforcing bar units to be connected, and there are many cases where one or both conditions are not satisfied. Moreover, since the vertical bars in such reinforcing bar units are usually constrained both in the axial and radial directions, it is extremely difficult to correct the axis center and screw pitch, which makes it extremely difficult to connect the reinforcing bar units. This made it extremely troublesome and inefficient.

On the other hand, as another connection method, a cylindrical body is loosely fitted across the conventional vertical reinforcement, and a grouting agent such as mortar, cement milk, or epoxy resin is injected and filled into the gap inside the cylindrical body.
The method used is to solidify this and connect both longitudinal bars. According to this grout connection method, the misalignment of the axes of both longitudinal bars and the thread pitch as in the case of the threaded joint connection method described above is not a problem, and the connection operation itself is simple, but it takes a long time for the grout to harden. As a result, the efficiency of the connection work deteriorates. However, it is still troublesome to maintain both longitudinal strips until the grout solidifies, and the connection performance is unreliable because it is not possible to confirm the filling state of the grout.

Therefore, the present invention combines the above-mentioned screw joint connection method and grout connection method, and utilizes only the advantages of both connection methods to simplify and streamline the connection work, and to create a reinforcing bar unit with high reliability in connection performance. It is intended to provide a connection method.

A feature of the present invention is a method for connecting reinforcing bar units, such as a wall reinforcing bar unit using a large number of threaded reinforcing bars, vertically connecting each other via a joint. Consisting of a coupler in which a joint part and a grout joint part whose inner diameter is larger than that of the threaded joint part are integrally connected in the axial direction, and a lock nut,
The threaded joint part of the joint is screwed onto the upper end of the valley longitudinal reinforcement of the lower reinforcing bar unit while applying a predetermined axial force with the lock nut, and after injecting grout agent into the grout joint part of the joint, the upper part The present invention relates to a method for connecting upper and lower reinforcing bar units by inserting the lower end of each longitudinal bar of the reinforcing bar unit into the grout joint and solidifying the grouting agent to connect upper and lower reinforcing bar units.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows an example of connection between wall reinforcement units, and FIG. 2 shows an example of connection between pile reinforcement units of a so-called cast-in-place pile called a reinforcing bar cage. To give an overview of these two examples, first, in Fig. 1, U is a schematic lower wall reinforcement unit, and U2 is a newly installed upper wall reinforcement unit that is to be connected to the unit U1 (hereinafter, these are simply referred to as lower wall reinforcement units). , 1・
, abbreviated as upper unit). Both units U1 and U2 are composed of vertical bars 1a made of a large number of threaded reinforcing bars.
+1b... are passed parallel to each other between the upper and lower lifting jigs 2 and 3 (lower unit U1 not shown) made of H-beam steel, and the upper part is attached to the upper lifting jig 2 with a stopper (not shown). It is fixed. /1.4 is a hanging piece for hanging, 5 is the same hanging wire, and 6 is a hanging hook.

On the other hand, in Fig. 2, U6 is the existing lower pile reinforcement unit, and U4 is the newly installed upper pile reinforcement unit (hereinafter, like the wall reinforcement unit, these will be abbreviated as the lower unit or "two-part unit"). U3. U4 consists of main reinforcements (hereinafter referred to as vertical reinforcements in accordance with the wall reinforcement unit) 7a, 7b and hoop reinforcements 8a, . 9 is a casing tube that becomes the pile outer covering.

However, the wall reinforcement unit U1. U2 and ゎ゛: muscle unit U3. The U4s are vertically connected to each other via joints 1o at the ends of each of the vertical bars 1a, 1b and 7a, 7b.

This joint 10 is composed of a coupler 11 and one lock nut 14, as shown in FIGS. 6 to 5. The coupler 11 is made up of a threaded joint part 12 having a female thread and a grout joint part 16 whose inner diameter is smaller than that of the threaded joint part 12, which are integrally connected in the axial direction. Note that a large number of circumferential grooves 13a with a constant pitch are provided on the inner peripheral surface of the cloud joint portion 16 in order to improve the adhesion of the grout agent. Further, since cloud bonding is inherently inferior to screw bonding in terms of bonding force, the cloud bonding portion 16 is formed to be longer than the screw bonding portion 12 so as to obtain an even bonding force. Reference numeral 15 denotes a spacer for steadying the vertical reinforcement, which is formed in the shape of a truncated cone divided into two halves.

Using this joint 10, both units U, , U2 and U6 for wall reinforcement and pile reinforcement. Each vertical strip 1a+ 1b of U4
And when connecting 7a, 7b, turnip 7-1 is attached to the upper end of each vertical strip 1a17a of lower unit u, U3.
1 (7) The lock nut 14 screwed into the I/G joint 12 and previously screwed into the vertical bars ta and I7a.
is tightened and press-contacted to the end face of the threaded joint 12 to introduce a predetermined axial force. As a result, as shown in FIG. 4, in a state where the cloud joint portion 16 of the coupler 11 protrudes above the lower longitudinal strip ia+7a, the coupler 11 and the lower longitudinal strip 1a,
7a are firmly coupled.

At the same time, a cloud agent 16 is injected into the cloud joint portion 16 of each coupler 11. As the grouting agent 16, a non-shrinking cement grouting agent or an epoxy resin clouding agent is used. In this case, the grouting agent 16 may be injected in a full state, and the upper unit vertical reinforcement 11 which is inserted afterwards.

7b may be moved by an appropriate amount by subtracting the amount.

In addition, at this time, the lower vertical reinforcement 1 screwed into the screw joint 12 is screwed into the hole.
A+7a serves as a bottom cover of the grout joint 1 to prevent leakage of the clouding agent 16.

After injecting this clouding agent, as shown in FIG.
Insert the lower end of each vertical strip 1b, 7b.

If this happens, the vertical stripes 1b,
The grouting agent 16 is completely filled between 7b and the inner circumferential surface of the joint part, similar to the conventional grouting agent connection method in which the grouting agent is injected into the gap between the vertical reinforcement and the cylinder after inserting the vertical reinforcement. There is no risk of grout cavities forming in the grout.

In addition, after inserting the longitudinal reinforcement with the upper end of the grout joint 16 (
A spacer 16 is press-fitted into the upper end of the coupler (upper end of the coupler), and the spacer 16 prevents the vertical stripes 1b and 7b from deflecting. Further, the spacer 16 also serves to correct the eccentricity and inclination of the vertical stripes 1b and 7b within the cloud joint portion 16.

With this, the connection operation itself is completed, and after this (several hours later) the grouting agent 16 solidifies, and both U1+
The connection between U2 and (J5.U4 is completed. At least until the grout is assimilated, the vertical strip T
It goes without saying that it is desirable to take measures to prevent the vibration of b + 7 b. As mentioned above, this connection method
The longitudinal stripes 1a+7a are screwed together with the threaded connection part 12 of the coupler 11, and the upper unit (i"2/U4) is connected with the joint 10 with the cloud agent 16 at the same gunout connection part 16. Since both units u, U2.B and U3.U4 are connected to each other, the following excellent effects can be obtained by utilizing only the advantages of both the screw connection method and the grout connection method.

■ Even if a pillar occurs due to the axis and screw pitch of the vertical bars 1a, 1b and 7a, 7b of both units to be connected,
This deviation can be absorbed by the cloud joint portion 16 of the joint coupler 11 and does not pose any problem.

■ Upper unit U2. Vertical lines 1b, 7b, l of U4! :
As for the connection operation with the joint 10, all the vertical bars 1b and 7
Since it is only necessary to insert the bolts b into the cloud joint portion 13 of the coupler 11 at the same time, the joining operation itself is much simpler than the conventional screw connection method in which both the upper and lower vertical bars are screwed to the joint.

(2) Moreover, the solidification time of the grouting agent 16 is shortened by half in the conventional dorouting agent connection method in which grouting is performed on both sides of the joint. Still, it is easy to maintain the vertical streaks until the kraut agent solidifies.

■ Grout joint 1 in which grouting agent 16 is injected in advance
Since the vertical stripes 1b and 7b are inserted into the grooves 6, the filled state of the grouting agent 16 is ensured as described above.

By the way, in the above embodiment, only two examples, a wall reinforcement unit and a pile reinforcement unit, are given, but the present invention can be used in general reinforcing reinforcement units that are connected and assembled vertically, such as a column reinforcement unit and a reinforcement arrangement unit for a bridge pier. Furthermore, it can of course be applied to a case where horizontal reinforcements are incorporated into vertical reinforcements at the same time in a wall reinforcement unit or the like.

As described above, according to the present invention, by making use of only the advantages of the threaded joint connection method and the cloud joint connection method, it is possible to simplify and streamline the connection work of upper and lower reinforcing bar units, and the connection performance is highly reliable. becomes.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is a front view showing the connection mode of the wall reinforcement unit, FIG. 2 is a front view showing the connection mode of the pile reinforcement unit, and FIG. 6 is the joint. Partially cutaway enlarged exploded perspective view of U, Figure 4 is included in the package U] Lower wall reinforcement unit, U
2 Upper wall reinforcement unit, U mouth...lower pile reinforcement unit,
U4 Upper pile reinforcement unit, 1a+7a... Vertical reinforcement of lower reinforcement unit, 1b, 7b... Vertical reinforcement of upper reinforcement unit,
DESCRIPTION OF SYMBOLS 10 Joint, 11 - Joint coupler, 12... Threaded joint part of the coupler, 16 Grout joint part, 14 Lock nut, 16 - Grout agent. Patent applicant: Kobe Steel, Ltd. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A reinforcing bar unit connection method in which reinforcing bar units such as a wall reinforcing bar unit using a large number of threaded reinforcing bars are vertically connected via a joint, and the above-mentioned joint connects a threaded joint having a female thread and the threaded joint. It is composed of a coupler in which a grout joint part with a dog-shaped inner diameter is integrally connected in the axial direction, and a lock nut. After applying a predetermined axial force using a lock nut and screwing together, and injecting grout into the grout joint of the joint, insert the lower end of each longitudinal bar of the upper reinforcing bar unit into the grout joint, and inject the grout into the joint. A method for connecting reinforcing bar units, which is characterized by connecting upper and lower reinforcing bar units to each other by solidifying the steel.