US3578733A - Method for making jointed concrete structures - Google Patents

Method for making jointed concrete structures Download PDF

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Publication number
US3578733A
US3578733A US731374A US3578733DA US3578733A US 3578733 A US3578733 A US 3578733A US 731374 A US731374 A US 731374A US 3578733D A US3578733D A US 3578733DA US 3578733 A US3578733 A US 3578733A
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US
United States
Prior art keywords
concrete
water stop
crack
water
joint
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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 - Lifetime
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US731374A
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English (en)
Inventor
John Hurst
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WR Grace and Co
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WR Grace and Co
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Filing date
Publication date
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Publication of US3578733A publication Critical patent/US3578733A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/16—Sealings or joints
    • 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

  • the invention also includes a novel assembly of a water stop and a spring clip for holding the crack-inducing body.
  • This invention relates to concrete structures.
  • the crack is then sealed by the application of a sealing compound to the depression.
  • the reinforcement is on the wet side of the sealing strip and is, therefore, liable to corrosion.
  • Other methods of sealing dummy joints have been proposed but none is a practicable proposition.
  • keying formation broadening out from its root is used herein to include any formation which will key satisfactorily into concrete and is broader at some point more remote from the striplike body than it is at another point closer to the striplike body.
  • the keying formation can be T-shaped or in the shape of an inverted truncated triangle.
  • the keying formations will all be the same shape, but this is not necessary.
  • the method of the present invention comprises positioning a water stop as hereinbefore defined flat on a surface against which concrete is to be cast such as on a base onto which concrete is to be cast, and/or securing the water stop to shuttering, positioning a crack-inducing body within the space where the concrete is to be cast and opposite the centre line of the water stop, and casting concrete in a single pour which extends across the water stop and crack-inducing body, so that the keying formations of the water stop become embedded in the concrete, while the opposite face of the water stop is not embedded, and a crack (which constitutes a dummy joint) is caused subsequently to form between the keying formations.
  • Such a crack-inducing body can be a projection integral with the water stop, but it is much preferred to use a piece of Wood or any other rigid or sernirigid material which is secured in place fater the water stop has been positioned against the base or shuttering. In this way, a building contractor need only have available to him one type of water stop, which is, however, used differently depending on the type of joint to be made (i.e., a dummy joint in accordance with the present invention or an expansion, construction or contraction joint in accordance with the invention of British specifications Nos. 1,008,811 and 1,088,812 referred to above).
  • the crack-inducing body in place by means of clips of suitable material such as metal, e.g., spring clips, which are themselves secured to the water stop at intervals along its length.
  • clips are conveniently secured to lugs projecting from the face of the water stop and formed integrally therewith; such clip-securing lugs preferably broaden out from their roots (particularly when spring clips are used) and thus serve also as formations for keying into the concrete; particularly, When the clip-securing lugs broaden out from their roots, it is preferred that there should be a further keying formation outboard of each of the clip-securing lugs, so as to eliminate any danger of the creation of a water-path in the region of the clips.
  • the water stop should have at least two pairs of keying formations in order to ensure that the water stop is fully secured to the concrete and to ensure an adequate water barrier.
  • the body can also be held in place in other ways, for example by clips or Wires attached to the crack-inducing body and to reinforcing bars and/or to bars specially provided for this purpose which may or may not become embedded in the concrete.
  • the crack-inducing body may be secured so that it touches the centre portion of the water stop or so that it is separated therefrom, e.g., by a distance of 2.5 to 10, preferably 5 to centimetres. Such separation is particularly desirable when the concrete contains reinforcement, which can then pass underneath the crack-inducing means, as well as, of course, over the top of it. It is not generally convenient for reinforcement to pass through the crack-inducing means, though this possibility is not excluded from the present invention.
  • the method of the present invention has the outstanding advantage that it makes it possible to prepare in a single pouring a long length of concrete of the kind which previously required to be formed in more than one stage, i.e., a length in excess of 4.5 to 7.5 metres, e.g., by use of the expensive and time-consuming method of alternate bay construction described above.
  • the use of the method of the invention for this purpose is shown in FIG. 2 of the accompanying drawings.
  • the size of the water stop to be employed and. of the crack-inducing body will be to some extent dependent on the dimensions of the concrete structure and the water pressure to which the structure is likely to be exposed, as also will the distance between adjacent dummy joints where more than one is required.
  • the height of the crackinducing body should generally be t. to /3 the depth of the concrete and the distance between adjacent dummy joints 3 to 7.5 metres, preferably about 4.5 metres.
  • a particular advantage of the novel water stop assembly is that two or more water stops can readily be joined together, if desired, to form a complete network.
  • the water stop has to change direction and runs in two planes inclined to each other, e.g., the horizontal and vertical planes, it is a simple matter to achieve this by means of a suitable preformed junction piece, which (by reason of the material of which the water stop is made) can readily be j-ointe'd in situ to the main strips to form a continuous waterproof run of water stop.
  • the water stop can simply be bent through the desired angle.
  • suitably shaped junction pieces e.g., in the form of a T, X or Y
  • the crack-inducing means will in general be somewhat more complicated in such situations, in order to ensure formation of the dummy joint in the required position, this does not present any difiiculty.
  • Another particular advantage of the novel water stop assembly is the ease with which the water stop can be secured in any desired position against shuttering (formwork) by driving nails (preferably double-headed nails) through the water stop outside at least the innermost pair of keying formations; the water stop preferably has a nailing flange outside any of the keying formations, through which flange the nails are driven.
  • FIG. 1 is a perspective view of a short length of water stop as described and illustrated in British specifications 1,008,811 and 1,008,812;
  • FIGS. 2 and 3 are side views of concrete cast respectively by a known method and by the method of the invention; and PIlgIG. 4 is a perspective view of a spring clip as shown in
  • the water stop of FIG. 1 has already been referred to above; its comprises a body portion 1, having keying formations 3 and 4 on each side of the centre line, and a marginal portion 5 through which nails may be driven.
  • the precise cross sections of the keying formations may be varied from those shown.
  • FIG. 2 shows concrete being cast by alternate bay construction upon a base 2, which may be of concrete or compacted earth. Concrete has been cast in the bays 4, supported by temporary stop end shutters 6, which are held erect by support 8. The bay 10 has not yet been cast. Beneath the junction of each bay is a water stop 12 (as shown in FIG. 1) to prevent entry of ground water.
  • FIG. 3 shows a perspective view of a preferred form of the clip 16, which may be fabricated from a single strip of tempered metal,
  • a nail may be passed through the wood 14 and through the hole 20 shown in FIG. 4 at the top of the clip, to assist in retaining the wood in position.
  • a piece of concrete 4.5 metres wide by 4.5 metres high by 300 metres long could be laid in about 70 Working days by the prior method illustrated in FIG. 2, and in only about 40 working days by the method of the invention as on the nature of the concrete and other factors.
  • a method of providing a water-sealed dummy joint in cast concrete slabs which comprises; positioning flat on a surface against which concrete is to be cast a water stop having a striplike body and at least one keying formation projecting along and from each side of its centre line within the space where concrete is to be cast; positioning a relatively thin crack inducing body within the space where concrete is to be cast and occupying about V2 to the depth of the space, spaced from and sub stantially perpendicular to the water stop and opposite its centre line and spaced from the opposite surfaces of the space where concrete is to be cast; securing the crack-inducing body by clips to lugs formed on the water stop and casting concrete in a single pour which extends across the water stop and the crack inducing body so that the keying formations become embedded in the concrete while the opposite face of the water stop is not embedded, and a crack (which constitutes a dummy joint) is caused subsequently to form between the keying formations.
  • crackinducing body is a piece of elongated rigid or semirigid material.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Building Environments (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Floor Finish (AREA)
US731374A 1967-05-26 1968-05-23 Method for making jointed concrete structures Expired - Lifetime US3578733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2471667 1967-05-26

Publications (1)

Publication Number Publication Date
US3578733A true US3578733A (en) 1971-05-11

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Application Number Title Priority Date Filing Date
US731374A Expired - Lifetime US3578733A (en) 1967-05-26 1968-05-23 Method for making jointed concrete structures

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US (1) US3578733A (enrdf_load_stackoverflow)
JP (1) JPS5010451B1 (enrdf_load_stackoverflow)
DE (1) DE1759649A1 (enrdf_load_stackoverflow)
FR (1) FR1564439A (enrdf_load_stackoverflow)
GB (1) GB1232584A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510539A (en) * 1981-12-28 1985-04-09 Lanier Business Products, Inc. Continuous loop cassette changer apparatus for a dictation/transcription system
EP0470829B1 (en) * 1990-08-07 1995-04-26 W.R. Grace & Co.-Conn. Method for modifying concrete properties
US6526721B1 (en) * 2000-05-26 2003-03-04 Brian D. Nash Fluid-impervious barrier/keyway form support apparatus, system and related method
US20080263981A1 (en) * 2004-08-13 2008-10-30 O'brien Timothy C Concrete Expansion Joint Forming Device
US20100000173A1 (en) * 2008-07-02 2010-01-07 Tomarco Contractor Specialties, Inc. Support structure for cast in place conduit, junction boxes and similar structures
CN106930238A (zh) * 2017-05-13 2017-07-07 师海林 一种水利工程止水带固定装置及使用方法
CN114351770A (zh) * 2021-12-06 2022-04-15 天津一冶建设工程有限公司 一种止水钢板安装装置及施工方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605142C1 (de) * 1996-02-13 1999-10-14 Schlueter Systems Gmbh Fußbodenverbundkörper
FR3030019B1 (fr) * 2014-12-15 2020-06-05 Guy Kreydenweiss Dispositif support pour un element allonge et plancher chauffant integrant au moins un tel dispositif
CN111501849A (zh) * 2020-04-14 2020-08-07 中铁第四勘察设计院集团有限公司 一种采用组合式钢边橡胶止水带的防水结构及其施工方法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510539A (en) * 1981-12-28 1985-04-09 Lanier Business Products, Inc. Continuous loop cassette changer apparatus for a dictation/transcription system
EP0470829B1 (en) * 1990-08-07 1995-04-26 W.R. Grace & Co.-Conn. Method for modifying concrete properties
US6526721B1 (en) * 2000-05-26 2003-03-04 Brian D. Nash Fluid-impervious barrier/keyway form support apparatus, system and related method
US20080263981A1 (en) * 2004-08-13 2008-10-30 O'brien Timothy C Concrete Expansion Joint Forming Device
US20100000173A1 (en) * 2008-07-02 2010-01-07 Tomarco Contractor Specialties, Inc. Support structure for cast in place conduit, junction boxes and similar structures
CN106930238A (zh) * 2017-05-13 2017-07-07 师海林 一种水利工程止水带固定装置及使用方法
CN106930238B (zh) * 2017-05-13 2018-12-21 师海林 一种水利工程止水带固定装置及使用方法
CN114351770A (zh) * 2021-12-06 2022-04-15 天津一冶建设工程有限公司 一种止水钢板安装装置及施工方法

Also Published As

Publication number Publication date
GB1232584A (enrdf_load_stackoverflow) 1971-05-19
DE1759649A1 (de) 1970-05-06
JPS5010451B1 (enrdf_load_stackoverflow) 1975-04-22
FR1564439A (enrdf_load_stackoverflow) 1969-04-18

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