EP0010883B1 - Improved crack inducing and sealing strip - Google Patents

Improved crack inducing and sealing strip Download PDF

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Publication number
EP0010883B1
EP0010883B1 EP19790302165 EP79302165A EP0010883B1 EP 0010883 B1 EP0010883 B1 EP 0010883B1 EP 19790302165 EP19790302165 EP 19790302165 EP 79302165 A EP79302165 A EP 79302165A EP 0010883 B1 EP0010883 B1 EP 0010883B1
Authority
EP
European Patent Office
Prior art keywords
strip
side walls
crack inducing
concrete
sealing strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19790302165
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0010883A1 (en
Inventor
Kevin Hinton
David Ronald Twyford
John Colin Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlegel UK Holdings Ltd
Original Assignee
Schlegel UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schlegel UK Ltd filed Critical Schlegel UK Ltd
Publication of EP0010883A1 publication Critical patent/EP0010883A1/en
Application granted granted Critical
Publication of EP0010883B1 publication Critical patent/EP0010883B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
    • E04F15/14—Construction of joints, e.g. dividing strips

Definitions

  • This invention relates to improved crack inducing and sealing strips for inducing a controlled crack in concrete and thus providing a contraction joint and sealing strip for the joint.
  • crack inducers or joint formers are in the form of extruded resiliently deformable strips of material which are normally introduced into the wet concrete and penetrate about one-third to one-quarter of the overall depth of the concrete slab.
  • This strip causes a plane of weakness in the concrete as it dries and subsequently shrinks, thus inducing a controlled crack which provides a contraction joint.
  • the strip acts as a seal. It is important that the crack inducing and sealing strip, once inserted in the wet concrete, does not come out again due to its natural buoyancy and also it is important, after the concrete has set, that the strip cannot fall out or be removed.
  • a suitable keying device is normally provided on part of the strip. What is more, once the concrete has dried it is important that water does not penetrate through the contraction joint either from above or below the concrete and likewise it is preferable that dust and other dirt does not find its way into the contraction joint when it has opened up.
  • the joint forming device shown in U.S. Specification No. 4090800 has a plurality of fins at its lower end to prevent it from floating out of wet concrete, but these do not key the strip into the concrete in a horizontal plane. Furthermore, the strip is of two part construction, causing installation problems among others, and is incapable of lateral expansion if the concrete in which it is inserted shrinks, thus allowing ingress of moisture, which can result in breaking up of the concrete in frosty weather.
  • the crack inducer and sealing strips of the present invention are designed to overcome these problems and meet the other requirements of such devices.
  • a crack inducing and sealing strip for insertion into wet concrete to provide a line of weakness and hence a contraction joint
  • the strip being extruded from resiliently deformable elastomeric material, being hollow, having at least one projection on the outer face of each of two side walls of the strip, which projections form a seal with the concrete once it has hardened, and the strip being several times deeper than it is wide, the projections being in the form of keying ridges generally centrally located along the depth of said side walls and the strip being hollow substantially throughout the total depth of the strip with the side walls spaced apart and joined together just along the top and along the bottom of the strip.
  • the strip At its upper end the strip may be provided with a laterally extending flange on each of its side faces, and it may be provided with a generally diamond shaped enlargement at its lower end.
  • the strip may be divided into two portions by two bands of material which is softer than the material from which the remainder of the strip is formed.
  • the upper portion of the strip may be detachable from the lower portion and in one construction, therefore, the upper portion is joined to the lower portion by said bands of softer material, said bands extending completely through the said side walls of the strip.
  • the bands may be integral with their adjacent keying ridge.
  • portion joining together the side walls of the strip at their tops may be formed. of softer material than the remainder of the strip.
  • the amount by which each keying device projects from its respective side wall is substantially less than the maximum width of the strip at any other location through the depth of the strip.
  • the strip is extruded from resiliently deformable materials, e.g. an elastomer such as a synthetic thermoplastic resinous material, in the form of a generally hollow body having a pair of spaced side walls 1 and 3 joined together at their upper end by a top wall 5, joined together at their lower end by a solid diamond shaped enlargement 7.
  • resiliently deformable materials e.g. an elastomer such as a synthetic thermoplastic resinous material
  • the corners 9 of the enlargement 7 project outwardly below the walls 1 and 3 for keying purposes, whereas the corner 11 is designed to be forced down into a mass of wet concrete.
  • the strip is formed by means of a dual durometer extrusion process and substantially midway between the top and bottom of each side wall 1 and 3, a keying ridge 13 is provided, these keying ridges being wider at their extremity than at their root and being of generally trapezium shaped construction.
  • the keying ridges are formed of a softer material than the side walls of the strip and it is preferred that this soft material extends completely through the side walls to form bands as shown at 15 so as to provide a line of weakness in each of the side walls 1 and 3 to enable the top portion of the strip to be removed from the remainder of the strip, as will hereinafter be described.
  • laterally projecting flanges formed as extensions of the top wall 5 are provided so as to increase the width of the strip.
  • the strip is about 8 times as tall as its mean width, and the amount by which the ridges 13 project from each side wall is substantially less than the maximum width of the strip at any other location throughout its depth. In this way, it is unlikely, when the strip is installed in a concrete area, that pieces of concrete immediately above the keying ridges will break away from the mass of concrete, resulting in subsequent ingress of water.
  • FIG. 2 An alternative construction of strip is shown in Figure 2, and parts similar to those of Figure 1 have the same reference numerals.
  • the strip differs from that in Figure 1, however, in that keying ridges 13a are provided which are formed of the same material as the side walls 1 and 3. They could however be formed of a softer material.
  • the side walls 1 and 3 are joined together at their top edges by a strip of soft elastomeric material 5a which is shown as being, but is not necessarily, softer than the side walls 1, 3.
  • This strip of material 5a could be of a foamed construction, or have passages running along its length. It will also be appreciated that the flanges 17 may be omitted.
  • the enlargement 7 is of a different construction from that shown in Figure 1. It should also be noted that the shape of the side walls may be altered. They could, for example, diverge more towards the top of the strip. It is important, however, that the side walls 1, 3 and the top 5 or 5a of the strip can flex to permit the two strips of concrete on either side of the strip to move relative to each other.
  • the keying wedges 13, 13a after the concrete has contracted, form an extremely effective moisture seal or barrier between the top and bottom of the joint, due to the tension set up as a result of the side walls of the strip beihg moved apart slightly during contraction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP19790302165 1978-10-19 1979-10-10 Improved crack inducing and sealing strip Expired EP0010883B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7841141 1978-10-19
GB4114178 1978-10-19

Publications (2)

Publication Number Publication Date
EP0010883A1 EP0010883A1 (en) 1980-05-14
EP0010883B1 true EP0010883B1 (en) 1982-01-27

Family

ID=10500434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790302165 Expired EP0010883B1 (en) 1978-10-19 1979-10-10 Improved crack inducing and sealing strip

Country Status (6)

Country Link
EP (1) EP0010883B1 (es)
JP (1) JPS5578742A (es)
AU (1) AU532000B2 (es)
BR (1) BR7906642A (es)
DE (2) DE2961992D1 (es)
ES (1) ES246257Y (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7069703B2 (en) 2000-08-04 2006-07-04 Building Innovations Pty Ltd Method and system for constructing large, continuous, concrete slabs

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2491523A2 (fr) * 1979-01-04 1982-04-09 Rossi Jean Fourrure pour calfeutrement de joints de fractionnement de protections d'etancheite
DE3337438A1 (de) * 1983-10-14 1985-05-02 Gebr. Happich Gmbh, 5600 Wuppertal Profilleiste
US4841704A (en) * 1988-05-23 1989-06-27 Jarrell Stephen E Screed track for concrete slab construction
DE4141138C2 (de) * 1991-12-13 1993-11-11 Schlueter Systems Gmbh Vorrichtung zur Ausbildung einer Dehnungsfuge in einem mit Keramikplatten belegten Boden
CN102808423B (zh) * 2012-08-23 2014-07-23 天津市津美园林工程有限公司 消除地面与建筑物外墙交接处沉降裂缝的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434401A (en) * 1967-06-20 1969-03-25 Us Interior Sealing strips for concrete slabs
US3575094A (en) * 1968-09-26 1971-04-13 Charles S Hewitt Expansion joint with water lock
US3871787A (en) * 1973-10-30 1975-03-18 William James Stegmeier Joint structure for concrete materials and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7069703B2 (en) 2000-08-04 2006-07-04 Building Innovations Pty Ltd Method and system for constructing large, continuous, concrete slabs

Also Published As

Publication number Publication date
AU532000B2 (en) 1983-09-15
EP0010883A1 (en) 1980-05-14
BR7906642A (pt) 1980-05-27
DE2961992D1 (en) 1982-03-11
ES246257U (es) 1980-02-01
JPS5578742A (en) 1980-06-13
DE7929663U1 (de) 1980-04-24
ES246257Y (es) 1980-08-16
AU5169079A (en) 1980-04-24

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