JPH0438856B2 - - Google Patents

Abstract

1. Connection and pressure-distribution element for two structural members (2, 3) to be concreted in succession in the same plane on a horizontal support (1) and to be separated from one another by means of an expansion joint (4), having a socket (5) and a mandrel (6) slidingly insertable in the socket (5), in each case at least two closed loops (7) made from reinforcing rods, respectively joined fast to the socket (5) and to the mandrel (6), being disposed both about the socket and about the mandrel and spaced from the same, which socket (5) is intended for fastening to a frontal shuttering (8) and for embedding with the loops (7) in the structural member (2) to be concreted first, and the mandrel (6) for inserting into the socket (5) anchored in the first set structural member (2) and for embedding with the loops (7) in the structural member (3) to be concreted later, characterized in that the socket (5) comprises a pipe (9) having at least three webs (10) of equal height disposed symmetrically about the pipe (9) and parallel to its longitudinal axis (x), over which webs at least tow steel rings (11) having loops (7) welded-on from outside are pressed on, which pipe (9) bears at one of its ends (9a) a flange (12) running perpendicular to the longitudinal axis (x) of the pipe (9) and at its other end (9b) a vertically adjustable support bar (13) having a lock nut (14), and that a mounting shoe (16) attachable to the frontal shuttering (8) is provided for, which shoe, in the position attached to the frontal shuttering, is intended for receiving the flange (12) of the pipe (9).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to reinforced concrete structures, and more particularly to two reinforced concrete structures that are successively placed in the same plane on a horizontal support member and that are separated from each other by an expansion joint. Regarding the connection and pressure dispersion element for two structural members, said expansion joint comprises a socket, a bar slidably insertable into the socket, and a bar made of reinforcing steel and attached to the socket and the bar, respectively. at least two closed loops arranged around and at a distance from these, said sockets being attached to the front concrete form and embedded together with the loops in the structural member to be initially concreted. The bar is first inserted into the anchored socket, the structural member is installed, and the bar is later embedded with the loop into the structural member to be poured with concrete.

[Conventional technology and problems]

Such joints and pressure distribution elements were introduced in July 1985.
No. 590,371, filed on the 10th. A disadvantage of this design is that when the diameter of the bar is changed, the diameter of the socket with the weld loop must be changed in order to be able to insert the bar into the socket opening. Therefore, not only bars but also sockets of different diameters must be used for different purposes. Such joining and pressure distribution elements are used to join structural members of various structures such as roof slabs, floor slabs, ceilings, walls, supports, retaining walls, highways, airport runways, in this case: The structural members are to be fixed precisely in the same plane. Structural members joined by such elements are affected by temperature and pressure differences and should therefore expand and contract in the direction of the joint.

It is an object of the present invention to provide an improved joint and pressure distribution element that allows the use of bars of different diameters without the need to replace the socket loop with a socket of matching diameter.

Another object of the invention is to provide a joint and pressure distribution element that does not require welding to the socket when the socket is modified, in which the loop can be stored.

[Means for solving problems]

For this purpose, in the joining and pressure distribution element according to the invention of the type mentioned at the outset, the socket consists of a pipe with at least three webs of the same height, these webs symmetrically around the pipe and close to the pipe. At least two steel rings with externally welded loops arranged parallel to the longitudinal axis of the pipe are pressed across these webs, and the pipe has at one end a flange extending at right angles to the longitudinal axis of the pipe. supporting a vertically adjustable support rod with a locking nut at the other end;
Also provided is a mounting shoe that can be attached to the front concrete formwork, and the mounting shoe receives the flange of the pipe while it is attached to the front concrete formwork.

The webs are preferably longitudinal ribs made from an integral piece of pipe, and each steel ring has an inner diameter that matches the outer diameter of the rib.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The elements shown in the drawings are usually two parts which are to be poured one after the other in the same plane on the horizontal support member 1 and separated by an expansion joint 4, especially for highway and airport runway structures (see FIG. 7). It is used to join concrete structural members 2, 3. Elements embedded in the structural member are exposed to temperature changes, allowing the structural member to expand and contract without constraining it. Furthermore, the element serves to distribute the forces that occur, in particular during the expansion and contraction of the structural element, over a large area of the concrete.

The joint and pressure distribution element consists of a socket 5, a mounting shoe 16 and a bar 6 which can be slidably inserted into the opening of the socket 5. Socket 5 is
It consists of a pipe 9 with at least three webs 10 of the same height, which webs 10 are arranged symmetrically around the pipe 9 and parallel to its longitudinal axis x. The socket 5 further includes at least two steel rings 11 pressed against the web 10.
including. Welded to each ring 11 from the outside is a loop 7 with a spiral shape. Although each loop 7 is made of reinforcing steel, it is not as thick as the rods of main reinforcing bar 20 (FIG. 6). The pipe 9 supports a flange 12 extending perpendicularly to the longitudinal axis x at one end 9a, and a nut 14 at the other shaft 9b.
It supports a vertically adjustable support rod 13 which can be locked at the desired height. The support rod 13 also has a bolt 1 into which a lock nut 14 is screwed.
The through hole 5 extends perpendicularly to the longitudinal axis x.

The web 10 is a vertically long rib formed integrally with the pipe 9. Since at least two steel rings 11 have the same inner diameter as the outer diameter of these ribs,
The ring 11 must be pressed onto the rib by hammering or thrusting. Leap 7 is welded to ring 11.

As is clear from FIGS. 3 and 4, the pipes 9 may have different internal diameters and accordingly webs 10 of different heights. Therefore, the rings 11 all having the same inner diameter and to which the loops 7 are welded
can be forced into pipes 9 with various internal diameters. A large quantity of rings 11 with loops 7 welded thereon can be kept in stock.
Also, pipes 9 with different internal diameters are used for bars 6 of different diameters.

The mounting shoe 16 shown in FIG. 2 has a U-shaped opening intended to receive one end 9a of the pipe 9. The mounting shoe 16 is attached to the front concrete formwork 8 by driving nails into nail holes 21 provided for the purpose of attachment. The face of the mounting shoe 16 in contact with the front concrete formwork 8 is inwardly stepped around the opening 17 in order to form a sliding recess 22 for receiving the flange 12. The surface of the mounting shoe 16 remote from the front concrete formwork 8 has an opening 1 on one side.
Two fastening ribs 18 are provided that are fixed to one side of 7. The ribs 18 provide a firm attachment of the structural member 2 to the concrete. Installation shoe 1
The side edges of 6 have centering slots 19 to facilitate the attachment of the mounting shoe to the front concrete formwork 8, and to move the front concrete formwork 8 away from the first structural member 2 after setting. Openings 1 are provided on the side facing the front concrete formwork 8 in order to securely secure it when tensioned.
It is chamfered towards 7.

The support rod 13 is made of steel and has a diameter of approximately 5 mm. Its support rod 13 is guided through a bolt 15 and is vertically adjustable within the bolt. The rod 13 serves to support the other end 9b of the pipe 9 while the socket 5 is embedded in the structural member 2. This support blocks the pressure of the concrete poured into the formwork structural member 2 and prevents the socket 5 from being pushed out of its position.

FIG. 7 shows the two structural members 2, with the socket 5, the mounting shoe 16, and the bar 6 embedded therein.
3 is shown. Here, the front concrete formwork is
The first installation structural member 2, the bar 6 inserted into the opening of the socket 5, and the second structural member 3, which is injected with the bar 6 embedded therein, are separated. Also shown between the structural members 2 and 3 is an expansion joint 4 filled with isolation material and formed by the movement of the front concrete formwork 8. Structural member 3
Once installed, the connection is established. A bar 6 having a diameter of 16 to 40 mm, adapted to the diameter of the opening in the socket 5, is later slid into the opening.
[Function] Since the joining and pressure dispersion element of the present invention is constructed as described above, if it is embedded in two adjacent concrete structural members 2 and 3 of a road, etc., as shown in FIG. The bar 6 in the second concrete structural member 3 is inserted into the socket 5 in the first concrete structural member 2, and the socket 5 and the bar 6 are connected.
Both concrete structural members 2 and 3 are joined via the socket 5 and the bar 6.

In addition, since the bar 6 inserted into the socket 5 is slidable, when one of the concrete structural members 3 tries to expand horizontally due to thermal expansion, for example, the bar 6 is inserted deeper into the socket 5. While absorbing pressure, the pressure is transferred and dispersed to the other adjacent concrete structural member 2. In this case, the loops 7 in both concrete structural members 2, 3 each further effectively distribute the pressure.

Similarly, in the case of a load change caused, for example, by a running track, the pressure initially applied to one concrete structural element 3 is distributed within the concrete structural element 3 by means of the loop 7 and also by the bar 6, the socket 5 and the It is transferred and distributed to the other adjacent concrete structural member 2 via the loop 7.

[Effects of the Invention] Therefore, according to the present invention, it is possible to effectively prevent the concrete structural members from bulging or being displaced vertically due to differences in temperature or pressure.

Additionally, since the bonding and pressure distribution elements of the present invention are assembled and manufactured in a factory, at the construction site the elements are simply adjusted in height and installed in one piece.
Assembly is very simple, since the mounting shoe does not simply need to be attached to the front concrete formwork at the desired height and the flanges of the sockets are slid into the sliding recesses of the mounting shoe. The other end of the socket is supported at the desired height by a support rod. The sockets are therefore no longer at risk of falling during the installation of heavy main reinforcing bars.

[Abstracts]

The element consists of a socket, a mounting shoe and a bar to be inserted into the socket. The socket is
It has a pipe with at least three webs of the same height. Pressed onto the web are at least two steel rings with welded loops. The pipe has a flange at one end and a support rod at the other end. The mounting shoe to be attached to the front concrete formwork is provided with a sliding recess for receiving the flange of the pipe. Bars of various diameters can be used with the joint and pressure distribution elements without even having to change the socket loop to a socket of corresponding diameter.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a socket with two spiral loops. 2 is a perspective view of a mounting shoe for receiving one end of the socket of FIG. 1; FIG. FIG. 3 is a cross-sectional view of the socket of FIG. 1, without the loops shown, in a first embodiment of the invention. FIG. 4 is a cross-sectional view of the socket of FIG. 1 without the loops shown, in an alternative embodiment of the invention. 5 is a front view of the steel ring of the socket of FIG. 1 with the spiral loop welded to the ring; FIG. FIG. 6 is a perspective view of the construction during pouring into the first concrete structural member, with the mounting shoe being attached to the front concrete form to receive the socket. Figure 7 is a cross-sectional view of a socket embedded in a first poured member, with the front concrete formwork embedded in this first member and a structural member inserted into the socket and subsequently poured. Being pulled away from the bar. 1: Horizontal support member, 2, 3: Structural member, 4: Expansion joint, 5: Socket, 7: Loop, 9: Pipe, 10: Web, 11: Steel ring, 12: Flange, 13: Support rod, 14: Natsuto, 15:
Bolt, 16: Mounting shoe, 17: Opening, 1
8: Attachment rib, 19: Slot.

Claims (1)

[Scope of Claims] 1. Bonding and pressure distribution elements for two concrete structural members to be poured one after another in the same plane on a horizontal support member and separated from each other by an expansion joint, said expansion joint being a socket and a pressure distribution element. ,
a bar slidably insertable into the socket; at least two closed loops made of reinforcing steel attached to and disposed around both the socket and the bar, respectively; and means for attaching the socket to the concrete formwork, the socket comprising a pipe having at one end a flange extending at right angles to the longitudinal axis of the pipe; at least three webs of the same height arranged symmetrically around the pipe in parallel to each other; at least two steel rings each pressed across said web; and each said ring. a vertically adjustable support rod disposed at an end of the pipe remote from the flange; a locking nut associated with the support rod; and a locking nut for receiving the flange. and a mounting shoe adapted to be attached to said front concrete formwork for the purpose of providing a bonding and pressure distribution element. 2. A joining and pressure distribution element according to claim 1, wherein the web takes the form of a longitudinal rib formed in one piece with the pipe. 3. A joining and pressure distribution element according to claim 2, wherein the inner diameter of each steel ring corresponds to the outer diameter formed by the longitudinal ribs. 4. The mounting shoe has a first surface intended for joining the front concrete formwork, an opposite second surface, a U-shaped opening, and one side of said opening on said second surface. 2. Two anchoring ribs disposed on one side, the first surface having an inward step around the opening to form a recess for receiving a flange. joints and pressure distribution elements. 5. The mounting shoe includes a side edge provided with a centering slot to facilitate attachment of the mounting shoe to the front concrete formwork, the side edge being chamfered on the first side towards the opening. , a joint and pressure distribution element according to claim 4.