KR100265423B1 - Mechanical connection for reinforcing bars, device for placing this mechanical connection and process for fixing the mechanical connection for reinforcing bars - Google Patents

Abstract

The present invention relates to a mechanical connection for a reinforcement bar, an apparatus for such a mechanical connection, and a method for fixing a mechanical connection for a reinforcement bar.

In order for the mechanical connection for the reinforcement bar to connect the bar and the bush according to the invention:

A bush 11 having a hollow cylindrical body into which the end of the bar without the connecting element is inserted,

A thread (8) at the end of the bush (11),

A bush and a thread of said cavity, which have a coaxial connection so that the two ends facing each other can be connected,

The outer surface of the bush, which is deformed by forming a linear or threaded indent,

-It is characterized by consisting of a rib 10 of the bar entering into the cavity body of the bush (11).

Used in building structures that use concrete.

Description

Mechanical connection for reinforcing rod, its installation device and fixing method

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view of a mechanical connection for a reinforcing rod attached to a horizontal bar and a vertical bar inside a curved end, according to the present invention.

Fig. 2 is a view of the device for installing the mechanical connecting portion for the reinforcing rod on the reinforcing rod when there is no connecting element at the end of the reinforcing rod.

3 is a cross-sectional view of the sleeve formed by the deformation process.

FIG. 4 is a view of an alternative embodiment of a modified tool having spherical balls in place of protrusions zigzag formed in FIG.

* Explanation of symbols for main parts of the drawings

1: connection part 2, 3: reinforcing rod

4: horizontal bottom 5: curved end

6, 7, 22: end 10: rib

11 sleeve 12 orifice

13: slope 14: axis

15: installation tool 16: extension tube

17: male part 19: body

21: hollow piston 25: ball socket joint element

The present invention relates to a mechanical connection for a concrete reinforcing rod. The present invention relates to a mechanical connection for a concrete reinforcing bar, a sleeve having a hollow structure and a device for installing the mechanical connection. The invention also relates to a method for fixing mechanical connections for reinforcement bars.

Application examples of the present invention can be found in particular in building construction using concrete, such as buildings or road structures inside cities and ports.

In these applications it is known to use mechanical connections for connecting the reinforcing rods in order to continuously transmit the tensile load.

Mechanical connections in accordance with the present invention can be used in the field to connect components manufactured industrially in a manufacturing plant with other reinforcing rods available in the field.

The reinforcing rods used in the field may have a rectangular end or a curved end and, as is known in the art, may have ribs or ridges on the outer surface of the reinforcing rods, the dimensions of the ribs being Very irregular and proportional to the diameter of the reinforcing rod. When the ribs are designed to provide a specific strength to the connection, depending on the associated configuration, the larger the diameter of the reinforcing rod, the larger the ribs, and the smaller the diameter of the reinforcing rod, the smaller the dimensions of the ribs.

In general, the ribs are arranged on the outer surface of the reinforcing rod, for example in a helical fashion, and also arranged at regular intervals or pitches, the separation or pitch being dependent on the diameter and the required strength of the reinforcing rod. do.

In order to renovate or expand the building under special circumstances, it is necessary to connect the reinforcing bars embedded in the concrete mass of the old building with another reinforcing bar.

Thus, in many cases, according to the construction of the available reinforcing rods, mechanical connecting means such as threads for easy connection are not provided on the reinforcing rods in the concrete, even if they have threads, for example, corrosion or Only the threads damaged by sea water are provided.

In many cases, the construction of the reinforcing rods according to the prior art does not provide a mechanical connecting means suitable for the ends of the reinforcing rods embedded in the concrete. At the ends of the reinforcing rods not manufactured in the manufacturing plant, no screw portion is formed, and therefore, it is difficult to connect the two reinforcing rods to each other to face the ends.

During construction work no threaded portion is provided on the end of the reinforcing rod, even if provided, due to corrosion and the threaded portion cannot be used.

Due to an accident occurring in the field, for example, the threaded end of the reinforcing rod may be cut abruptly, so that the threaded portion may not be formed.

It is essential that a concrete slab, such as a floor manufactured industrially in a manufacturing plant and consisting of a series of reinforcing bars protruding horizontally from a concrete slave, be connected to a series of vertical reinforcement bars in the field. to be. The reinforcing rods in the horizontal direction may be configured in a rectangular or curved shape, and the vertical concrete reinforcing bars forming part of the vertical concrete element should be connected in situ with the ends of the horizontal reinforcing rods.

Also in the field, when the horizontal reinforcing rods of the floor and the rods in the vertical direction are constructed very close to each other, the density of the steel elements becomes considerably large, so that the horizontal reinforcing rods and the vertical reinforcing rods with the large tools It is difficult to access

At present, a method of connecting the reinforcing rods is known, for example, using a tubular sleeve in which a corrugation structure is formed by a press. For this purpose, it is essential to use a large sized jaw configured outside and bulky because the system using an enveloping jaw for the generation of external pressure must be powerful. If the two reinforcing rods are configured too close to each other, it is no longer possible to work quickly in the field, so the bulky configuration becomes a problem when the compositional density of the reinforcing rods and steels is large.

When a jaw is used to form a corrugation structure on two reinforcing rods facing the end when external pressure is applied, it is impossible to check and test whether the correct work has been performed and the work must be dependent on the operator. .

In order to counteract the load on the tools, the weight of the device and the dies is very large. Because the load must be transferred to the frame, it is necessary to use a heavy and bulky outer frame by means of punches, dies and working loads. For example, since up to 200 tons of pressure are applied, it is not easy to work quickly and effectively in a safe state during all corrugation forming operations.

It is an object of the present invention to solve the above problems and to provide a mechanical connection for the reinforcing rod, wherein the end of the reinforcing rod connects the concrete reinforcing rod without connecting means such as screws. The failure of the screw is due to corrosion or because the mechanical connection may not be provided during construction and the mechanical connection may be accidentally cut at the site.

It is a further object of the present invention to provide a mechanical connection for a reinforcing rod which is quick to work in the field by easy to handle lightweight tools.

It is a further object of the present invention to provide a mechanical connection for a reinforcement rod which is precisely operable on reinforcement rods of very high density, ie reinforcement rods located very close to each other, through a tool of small dimensions.

Another object of the present invention is to provide a mechanical connection part for a reinforcing rod which can be tested by applying a stress corresponding to 90% of the yield strength of the connection part after the connection operation.

Another object of the present invention is to provide a device for installing a mechanical connection so that all the connections manufactured by necking the sleeve inward on the end of the reinforcing rod in relation to the quality of the corrugation structure can be reliably.

Still another object of the present invention is to allow the industrial production of a member having a protruding reinforcing rod to be quickly introduced in the field in order to connect the reinforcing rod available in the field.

For example, all slabs in the horizontal direction can be manufactured industrially at the same time, and then connected with vertical reinforcement bars, all adjusted to the same height, for example by pre-colliding the ends of the reinforcement bars.

The device according to the invention has the advantage of being very easy to handle and readily available in the field.

In order to ensure the quality of the connection in operation, the device is provided with means for testing the product which has just been performed, and according to the prior art, when using the technique of forming a corrugation structure by a jaw, quality control of the configured connection is impossible. The problem is solved by the present invention.

It is a further object of the present invention to provide an apparatus capable of increasing the daily workload to 400 compared to the prior art, which has a daily workload of 40 connections.

According to the present invention, a mechanical connection for a reinforcing rod used in a concrete element construction site, fitted on a rectangular end or a curved end, and having ribs on an outer surface, for connecting a reinforcing rod and a sleeve,

A sleeve having a cylindrical hollow body with the end inserted of the reinforcing rod without connecting elements,

A male thread located at the end of the sleeve,

The hollow body and the male part form a concentric axis, in order to connect two reinforcing rods arranged with their ends facing each other;

A necking action is made inward at the end of the reinforcing rod, so that the outer material of the sleeve is deformed,

-The material of the ribs located on the reinforcing rod is necked into the hollow body of the sleeve and penetrated to deform the material of the ribs.

Referring to FIG. 1, a mechanical connection 1 for a concrete reinforcing rod is shown. Recently, the reinforcing rods known to those skilled in the art for reinforcing structures are widely used in the field. The reinforcing rod 2 is connected to another reinforcing rod 3, and the reinforcing rod 3 is concentric with the reinforcing rod 2, and one end is arranged at the other end. Accordingly, the tensile load is continuously transmitted by the connecting portion 1 between the reinforcing rod 2 and the reinforcing rod 3.

Although one reinforcing rod 3 is shown in FIG. 1, the reinforcing rod 3 may for example form part of the horizontal floor 4, and is composed of a plurality of reinforcing rods arranged in parallel. It may be configured. Each reinforcing rod 3 can protrude in a straight line from the horizontal bottom 4 and have a curved end 5 as in FIG.

The construction further comprises a vertical portion which is integrally formed with a series of reinforcing rods 2 arranged in parallel. Therefore, it is necessary to connect the end 6 of the reinforcing rod 3 to the end 7 of the reinforcing rod 2. The end 7 of the reinforcing rod 2 does not have a connecting element, ie a mechanical connection is simply formed by the person skilled in the art, so that the end 7 does not have a male threaded portion or a female threaded portion.

The screw portion can be omitted since it can be configured at the site of use and can also be omitted in connection with corrosion and careless cutting.

By means of the method according to the invention, when the mechanical connection is integrally formed with the end 7 of the reinforcing rod, the mechanical connection 1 according to the invention can be connected with the reinforcing rod 3, for example by means of a screwing method. Can be. A male screw portion 8 provided at the end of the connection can be connected inside the female screw portion 9 provided on the end 6.

Referring to FIG. 2, the reinforcing rod 2 has an end 7 but no connecting element, in particular a threaded portion. The reinforcing rod 2 of suitable diameter has ribs 10 arranged on the outer surface, for example in a circular or helical manner. The ribs 10 are irregularly configured and, as is known in the art, when the ribs are actually subjected to tensile stress, the ribs can easily fix the reinforcing bars inside the concrete. The width and height of the ribs 10 are adapted to the diameter of the reinforcing rod.

If the ribs are constructed, the diameter of the reinforcing rod is not regular, and the ribs are not accurately distributed on the outer surface of the reinforcing rod.

The mechanical connection 1 for a concrete reinforcing rod according to the invention consists of a sleeve 11 having a cylindrical body, and an end 7 of the reinforcing rod is inserted into the sleeve 11 through an orifice 12.

In a preferred embodiment of the invention, the sleeve 11 has a cylindrical shape over most of its length and also has an inclined surface 13. As shown in FIG. 1, the end of the sleeve 11 has a male threaded portion 8 on the inclined surface l3.

The mechanical connection for the concrete reinforcement rod is thus constituted by a cylindrical sleeve 11 and the sleeve 11 is fitted over the end 7 of the threaded reinforcement rod 2, the sleeve 11 being It has a male screw portion (8). The reinforcing rod 2 and the male screw portion 8 are arranged concentrically along the shaft 14 so that the ends of the reinforcing rod 2 and the reinforcing rod 3 can be connected to each other.

The different components of the mechanical connection are made of metal, but when pressure is applied on the outer surface of the sleeve 11, the ribs 10 deform inside the sleeve 11 so that the ribs 10 deform than the constituent material of the reinforcing rod 2 A more ductile material can be advantageously selected for the sleeve 11. For example, the sleeve 11 may be necked and crimped inward on the end 7 of the reinforcement bar 2 so that the end 7 of the reinforcement bar 2 may be deformed. For example, the deformation can be done by the vertical surface of the installation tool (15).

In order to contact the reinforcing rod and the sleeve, the material constituting the ribs of the reinforcing rod is deformed by the necking action and penetrated into the inner region of the sleeve facing the reinforcing rod.

An installation tool 15 for installing the mechanical connection 1 is shown in FIG. 2.

The installation tool 15 has a threaded extension tube 16, a male portion 17 or a female thread portion is formed on one of the ends of the extension tube 16, the male thread of the connecting portion (1) The female threaded portion is screwed onto the portion 8.

The male screw portion 17 of the extension tube 16 is fixed to the inner end 18 formed in the hollow body 19 constituting the jack (jack), the jack is capable of double-acting movement. The movement region 20 in which the hollow piston 21 is movable is formed by the body 19 and the extension tube 16 of the jack.

By means of staggered protrusions and spherical balls, a necking tool operating according to a known method is integrally formed with the end 22 of the hollow piston 21. In certain cases, depending on the diameter of the reinforcing rod to be connected, the devices can be adjusted. By suitably selecting the number of spherical balls, the corrugation structure can be adjusted.

In order to improve surface contact and to form better connections, it is advantageous to use a heating system that increases the temperature from 500 ° C. to 750 ° C. for 5 to 10 seconds. High frequency self-guided systems are suitable for local heating of small size components. The small size and low weight low frequency device allows rapid heating and temperature increase in seconds.

When the cooling action of the metal is made after the above operation, shrinkage-enhanced corrugation structure is advantageously formed by thermal stress, and as a result, a good adhesive state is formed, and a connection part is formed completely between the reinforcing rod and the sleeve.

In particular, by the self-induction heating action, the load size associated with the formation of the corrugation structure is further reduced and smaller tools can be used.

Therefore, 40 millimeters of reinforcing rod diameter requires 60 tons of pressure by four spherical balls, and 40 millimeters of reinforcing rod diameter of 15 millimeters for the circular necking tool 23.

By reliably integrally connecting the reinforcing rod and the coupler by the above method, the connecting portion can be configured to reduce the length of the coupler considerably compared with the corrugated couplers formed perpendicular to the reinforcing rod. Can be.

The necking tool with spherical ball in figure 4 is shown in detail. The grooves 27 are formed on the outer side of the sleeve 11 by the spherical balls. When the installation tool is coupled on the outer surface of the sleeve to form a vertical corrugation structure in the vertical downward motion, the penetration action controlled by the vertical downward motion is achieved, and the penetration action can be adjusted by the spherical balls. have.

When the hollow piston 21 moves downward in the direction of the arrow F, the end of the necking tool 23 is vertically moved by the distance D. The base 24 of the necking tool 23 is in contact with the ball socket joint element 25. The ball socket joint element 25 is arranged on a ball socket joint plate 26 with an inserted neoprene washer.

A strong pressure interacted by the hollow piston is first applied from the necking tool 23 to the inclined surface 13 and then to all outer peripheral portions of the sleeve 11. Referring to FIG. 3, the end 7 of the reinforcing rod is connected with the sleeve 11 by a deformation action simultaneously at the pressure and at the periphery of the sleeve 11. A sufficient number of grooves 27 are formed on the outer side of the sleeve 11 by the necking tool, and the grooves 27 are preferably distributed evenly over the entire periphery. Of course, the number of the grooves 27 depends on the diameter of the reinforcing rod connected.

When the necking tool 23 is moved vertically over the distance D, the grooves 27 are recessed in the outer periphery of the sleeve by the necking tool, and also through the pressure in the region where the end 7 is formed. The necking tool 23 deforms the ribs 10 of the reinforcing rod. Of course, a material that is more ductile than the material of the reinforcing rod 2 is selected as the constituent material of the sleeve 11 so that the deformation action is possible.

Therefore, when the sleeve 11 is connectable to the end 7 of the reinforcing rod, and necking (necking) to the inner side of the sleeve 11, the sleeve 11 and the end 7 in a corrugated structure Can be formed. For this connection, the constituent material of the ribs 10 arranged in the reinforcing rod is diffused at the end 7 into the inner constituent material of the sleeve 11.

Referring to FIG. 2, when the pressurized oil is delivered, the installation tool 15 is operated by the hollow piston 21. A sleeve 11 connected to the extension tube 16 is fixed to the body 19 of the jack. Reaction with respect to the hollow piston 21 descending by the distance D occurs, and a necking action is performed internally by the hollow piston 21. Ribs 10 located on the outer surface of the reinforcing rod penetrate the inner region material of the more ductile sleeve.

At the end of the work process, the base 24 of the necking tool 23 is supported by the ball socket joint element 25 and the test is carried out at a predetermined value corresponding to, for example, 99% of the yield strength of the reinforcing rod. . While the necking tool 23 is raised from the lower position to the upper position, if the sleeve 11 remains engaged with the concrete reinforcing rod 2, the test result is judged to be satisfactory.

If the necking action cannot be performed inward under satisfactory pressure and operating conditions, the bonding state is disconnected during the test, while the separation action is more likely to occur during the test, in order to prevent accidental accidents at the site later on. In this case, the connection part 1 may be reworked or replaced.

The device for installing the mechanical connection is very small in size and movable vertically on the reinforcing rod. Thus, the apparatus can be easily used when the limited density of the space or the reinforcing rods is large. The load generated by the installation tool 15 is transmitted to the sleeve 11 and the reinforcing rod.

In addition to the concrete reinforcing rod, the present invention can be applied to products such as smooth rods for forming wrinkles.

Other embodiments of the invention may be practiced by those skilled in the art without departing from the scope of the invention.

Claims (7)

Mechanical connection for reinforcement rods used in concrete element construction sites, fitted on rectangular or curved ends and having ribs on the outer surface, for connecting the reinforcement rods and sleeves, A sleeve 11 having a cylindrical hollow body with an end of a reinforcing rod without connecting elements, Consisting of a male part 8 located at the end of the sleeve 11, The hollow body and the male part form a concentric axis, in order to connect two reinforcing rods arranged with their ends facing each other; A necking action is made inward at the end of the reinforcing rod, so that the outer material of the sleeve is deformed, A mechanical connection part for the reinforcing rod, characterized in that the material of the ribs 10 located on the reinforcing rod is necked and penetrated into the hollow body of the sleeve 1l, so that the material of the rib is deformed. 2. Mechanical connection according to claim 1, characterized in that an inclined surface (13) is formed on the outer side of the sleeve (13) between the cylindrical portion and the male screw portion of the sleeve. An apparatus for installing a mechanical connection on a reinforcing bar when the end of the reinforcing bar does not have a connecting element, for connecting two reinforcing bars arranged with their ends facing each other. The body of the jack, double-acting (19), An extension tube (16) fitted with a threaded portion formed at the end of the sleeve and fixed to the body (19) of the jack and having a female threaded portion, A hollow piston 21 of the jack arranged between the body 19 and the extension tube 16, Deforming the outer material of the sleeve 11 and deforming the ribs 10 of the reinforcing rod in the sleeve so that the pleating structure of the sleeve 11 is formed and coupled by an internal necking action on the end of the reinforcing rod. Device, characterized in that a necking tool (23) is arranged on the end of the hollow piston (21) and movable vertically. 4. A ball socket joint element (25) according to claim 3, wherein a ball socket joint element (25) is constructed and the peripheral portion of the necking tool (23) is supported on the ball socket joint element (25) in the initial stage of the jack's downward movement to test the connection. Characterized in that the device. In the fixing method for fixing the mechanical connection for the reinforcing rod by configuring the connection of claim 1 available in the field, The end of the reinforcing rod having no connecting element is covered by the sleeve, -Necking action and grinding action of the sleeve to the end of the reinforcing rod by the vertical movement of the necking tool (23), A material that is softer than the material of the reinforcing rod is selected as the material of the sleeve so that the ribs 10 on the reinforcing rod deform inside the hollow body of the sleeve, -The method of fixing the mechanical connection of the reinforcing rod, characterized in that the load generated by the necking tool is transmitted to the reinforcing rod. 6. A device according to claim 5, wherein when the connection is made, the connection is tested at a defined yield strength of the reinforcing rod. The end of the reinforcing rod is heated to 500 ° C. to 750 ° C. for 5 to 10 seconds in order to improve the contact surface and to form a better connection, and then shrink the assembly and corrugate the structure. In order to power, the device characterized in that the cooling.