EP1861562A2 - Device for coupling sheaths - Google Patents

Device for coupling sheaths

Info

Publication number
EP1861562A2
EP1861562A2 EP05717140A EP05717140A EP1861562A2 EP 1861562 A2 EP1861562 A2 EP 1861562A2 EP 05717140 A EP05717140 A EP 05717140A EP 05717140 A EP05717140 A EP 05717140A EP 1861562 A2 EP1861562 A2 EP 1861562A2
Authority
EP
European Patent Office
Prior art keywords
piece
pieces
coupling device
referred
coupling
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.)
Granted
Application number
EP05717140A
Other languages
German (de)
French (fr)
Other versions
EP1861562B1 (en
Inventor
John R. Crigler
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.)
VSL International Ltd
Original Assignee
VSL International 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 VSL International Ltd filed Critical VSL International Ltd
Publication of EP1861562A2 publication Critical patent/EP1861562A2/en
Application granted granted Critical
Publication of EP1861562B1 publication Critical patent/EP1861562B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/10—Ducts
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed

Definitions

  • the invention relates to a device for coupling the ends of sheaths, such as sheaths which have been placed beforehand in prefabricated elements intended to be assembled through reciprocal pressing of the coupling surfaces.
  • prestressing cables In precast segmental construction, two types of prestressing cables are used, i.e. external unbonded and internal bonded.
  • the invention concerns precast segmental construction in which internal bonded prestressing cables are used.
  • the invention refers more specifically to a device for coupling the ends of sheaths, such as sheaths which have been embedded in the prefabricated elements in concrete intended to be assembled through reciprocal pressing of the coupling surfaces.
  • the invention concerns the field of construction of structures such as bridges, achieved through reciprocal pressing, then holding, of the prefabricated elements in concrete, by means of prestressing cables which pass through the different sheaths situated in the these prefabricated elements.
  • the invention likewise relates to prefabricated elements which comprise pieces with a view to forming the device of the aforesaid type for coupling the ends of sections of sheaths.
  • the invention likewise relates to constructions made with prefabricated elements which are provided with devices of the aforesaid type for coupling the ends of sections of sheaths.
  • constructions comprising an elongated part of great length, such as a bridge girder, known is to prefabricate said elongated part of the construction in a plurality of sections which, referred to as prefabricated elements, will be able to be subsequently placed in reciprocal pressing contact and assembled on the site of the civil engineering construction.
  • the prefabricated elements are conceived for assembly through reciprocal pressing along coupling surfaces which are substantially orthogonal to the longitudinal axis of the elongated part to be formed.
  • prestressing cables which pass through the assembly of the prefabricated elements longitudinally and are tensioned in such as way as to press forcefully the prefabricated elements against one another.
  • the ends of the sheaths are positioned in such a way as to ensure a continuity of passage at the level of the coupling surfaces between the prefabricated elements.
  • One result which the invention aims to obtain is a coupling device which allows a continuous sheath to be created across the segments' joints, that is to say a coupling device which
  • the aim of the invention is to ensure a complete encapsulation of the tendon inside the sheath.
  • the present invention also allows extreme longitudinal tolerances in the expected joints in case of shimming of prefabricated elements.
  • the invention has as its object a device of the aforementioned type, according to claim 1.
  • Figure 1 a partial lateral view of a civil engineering construction comprising an elongated part constituted by reciprocal pressing of prefabricated elements
  • Figure 2 on an enlarged scale, a partial sectional view of two prefabricated elements during reciprocal pressing,
  • Figure 3 on a scale enlarged still more than Figure 2, a partial sectional view of two prefabricated elements seen immediately after their reciprocal pressing,
  • Figure 4 a partial sectional view of two prefabricated elements after assembly
  • Figure 5 a view in longitudinal section of an elongated body used for production of the coupling device according to the invention
  • Figure 6 a view in longitudinal section of the elongated body according to Figure 5, after division,
  • Figures 7 and 8 two lateral views of a piece likewise used for construction of the device according to the invention.
  • a civil engineering construction 1 can be seen, such as a bridge, comprising an elongated part 2, such as a bridge girder.
  • the elongated part 2 is composed of a plurality of sections, which are referred to in the following as prefabricated elements 3.
  • the prefabricated elements 3 are designed to be assembled through reciprocal pressing along the coupling surfaces 4, 5, referred to as first and second, which are substantially orthogonal to a longitudinal axis 6 which has the elongated part 2 to be made up.
  • Each prefabricated element 3 includes two coupling surfaces 4, 5 which are substantially opposite and are referred to as first coupling surface 4 and second coupling surface 5 ( Figure 2).
  • the different prefabricated elements 3 placed in reciprocal pressing contact are held together by means of prestressing cables 7 which, on the one hand, pass through the assembly of prefabricated elements 3 longitudinally, and, on the other hand, are tensioned in such a way as to press forcefully said prefabricated elements 3 against one another, by their first and second coupling surfaces 4, 5 (this assembly technique is known and is not explained in detail in the following).
  • Each prefabricated element 3 comprises at least one sheath 8 making it possible for the prestressing cable to pass through the element, each sheath having two opposite ends, referred to as first and second end 9, 10.
  • the first and second ends 9, 10 of the sheath 8 each come out into one of said first and second coupling surfaces 4, 5.
  • the sheath 8 is of a corrugated type, that is to say comprises ribs to allow transfer of bond forces from the prestressing cables 7 to the prefabricated elements 3.
  • the first and second ends 9, 10 of each sheath 8 with which a prefabricated element 3 is provided are disposed such that during the assembly of a plurality of prefabricated elements 3 to one another, each of said first and second ends 9, 10 which comes out into a first or second coupling surface 4, 5 is aligned with a first or a second end 9, 10 of another sheath 8 provided in the one of the prefabricated elements 3 which has a first or a second coupling surface 4, 5 opposite thereto.
  • first and second ends 9, 10 which are aligned co-operate through a coupling device 11 , the function of which is, in particular, to provide leak-tight connection of sheaths.
  • the coupling device 11 comprises:
  • the coupling device 11 is noteworthy in that it comprises:
  • first and second pieces 12, 13 having first and second inner bearing areas 16, 17 which are each substantially cylindrical, and a third piece 18 having a third and a fourth outer bearing area 20, 21 which are cylindrical,
  • this third piece 18 and at least one of said first and second pieces 12, 13 having dimensions such that the third piece 18 can be placed in a position referred to as the first position P1, in which it is found entirely sheltered in one of said first and second pieces 12, 13,
  • said fourth outer bearing area 21 co-operates with a second bearing area 17 of a second piece 13.
  • the sheath 8 and the coupling device 11 can be installed at angles orthogonal or other than orthogonal to the coupling surfaces 4, 5 of the segments 3.
  • the coupling device of the invention comprises pieces with longitudinal dimensions that do not need to be of an exact predetermined length.
  • the device for coupling the ends of sheaths of the invention can be used whatever is the angle between the longitudinal axe of the prestressi ⁇ g cables 7 and the coupling surfaces 3, 4.
  • first and second pieces 12, 13 have first and second inner bearing areas 16, 17 which are each substantially cylindrical and of circular cross section, and a third piece 18 has a third and a fourth outer bearing area 20, 21 which are cylindrical and of circular cross section.
  • first and second pieces 12, 13 have first and second inner bearing areas 16, 17 which are each substantially cylindrical and of non-circular cross section, and a third piece 18 has a third and a fourth outer bearing area 20, 21 which are cylindrical and of non-circular cross section.
  • Said aforementioned cross section can be of a square type or of a flattened type such as a rectangular type or oval type.
  • the coupling device 11 according to the invention thus does not involve using a sealing element which, to ensure the tightness of the sheath, needs to be compressed in the direction of coming together of the prefabricated elements 3.
  • the sheath 8 is made of plastics such as polypropylene or polyethylene and the first piece 12 and the second piece 13 are likewise of material of the same nature, and, - on the other hand, said first piece 12 and second piece 13 are each assembled through welding to one of said first 9 and second 10 ends of the sheath 8 through which they must be borne.
  • connection such as fusion weld couplers or the use of mechanical couplers may be envisaged.
  • the third piece 18 is likewise made of plasties such as polypropylene or polyethylene.
  • the elements 23, 24 for longitudinal displacement of the third piece 18 between said first position P1 and said second position P2 consist essentially of:
  • a first stop 23 situated on the third piece 18 and integral therewith, this stop being able to transmit to said third piece 18 at least one of the actions which are a pushing action and a pulling action, this action being directed so as to bring about the displacement of the third piece 18 between said first and second positions P1, P2,
  • a control piece 24 capable of being inserted into a sheath 8 of a prefabricated element 3 in such a way as to have
  • first terminal part 25 bearing at least a second stop 26 intended to co-operate with the first stop 23 of a third piece 18 to enable it to apply at least one of the actions which are a pushing action and a pulling action to bring about its displacement between said first and second positions P1 , P2, • a second terminal part 27 which is situated outside the prefabricated element 3 when the first terminal part 25 cooperates with a first stop 23 of a third piece 18 for the purpose of applying one of said actions of pushing or of pulling intended to displace said third piece 18 between its positions referred to as first P1 and second P2.
  • the third piece is displaced from its first position P1 toward its second position P2 through pulling on the control piece 24.
  • the third piece 18 is made up of a tubular part with an internal face and an external face, and this tubular part is of a corrugated type, that is to say comprising ribs.
  • the third piece 18 has a first predetermined length L1.
  • the ribs create depressions in the internal face and projections on the external face, and each depression created in the internal face constitutes a stop which can be used as a first stop 23.
  • control piece 24 consists, for example, of a rod which, at a first end, bears a short bar of a first predetermined longitudinal dimension, connected at its middle to the rod by a hinge.
  • the short bar is held parallel against the rod by a spring.
  • the bar can be twisted away from the rod, against the action of the spring, by pulling on a string which is connected to said bar and presents a free end situated near a second end of the rod, in such a manner as to be able to be actuated by a person holding the rod by said second end.
  • the length of the short bar is predetermined in such a manner that, when the string is pulled from the second end of the rod, the two ends of this bar come in contact with the internal face of the third piece, preferably each with a depression created in the internal face.
  • the rod can be removed from the inside of the sheath.
  • control piece 24 consists of a rod which, at a first end, bears an expandable device.
  • This device is of a type, on the one hand, able to be radially contracted in order to be introduced in the third piece (or withdrawn from said third piece) and, on the second hand, able to be radially expanded against the internal face of the third piece 18 in order to co-operate with at least one depression of this face and allowing the third piece to be pulled or pushed.
  • the expandable device comprises :
  • said first and second inner bearing areas 16, 17 of the first and second pieces 12, 13 are made up of smooth surfaces which are cylindrical,
  • the third piece 18 bears at least two annular sealing elements 28, 29 which, referred to as first annular sealing element 28 and second annular sealing element 29, each have a face which forms at least partially one of said third and fourth outer bearing areas 20, 21 that bear said third piece 18, these annular sealing elements 28, 29 are each
  • said first and second annular sealing elements 28, 29 are, for example, O-rings made up of neoprene or similar material, but one skilled in the art is able to select other materials.
  • first and second annular sealing elements 28, 29 makes it possible to ensure a leak tightness in the coupling of the ends of the sheath 8.
  • the third piece 18 has at least two pressing and centering surfaces 181 to 185 in said first and second inner bearing areas 16, 17 of said first and second pieces 12, 13, and
  • the dimensions of the pressing and centering surfaces 181 to 185 are selected so as to ensure the functions of pressing and centering of the third piece 18 in the first and second inner bearing area 16, 17, without impeding the function of tightness obtained through said first and second annular sealing elements.
  • the third piece 18 consists of a tubular wall piece, referred to as third tubular wall 36, with a first predetermined length L1 between two opposite end faces 34, 35, referred to as first end face 34 and second end face 35, and the fifth 32 and sixth 33 stops borne by the third piece 18 are each made up of a portion of the surface formed by said first and second end faces 34, 35.
  • one of said first and second pieces 12, 13 has, inside, a second length l_2 which is at least equal to the first length L1 of the third piece 18, and
  • one of said first and second pieces 12, 13 has, inside, a second length L2 which is at least equal to the first length L1 of the third piece 18, and
  • the sheath 8 has a wall defining an inner passage with a first inner diameter of predetermined value D1 , and:
  • the first and second inner bearing areas 16, 17 of said first and second pieces 12, 13 each have a second and a third inner diameter D2, D3 which are of substantially equal value to one another, but each is a value greater than the value of the first inner diameter D1 of the sheath 8,
  • the third tubular wall 36 of the third piece 18 defines, on the one hand, an inner surface 22 having a fourth inner diameter D4 which is substantially equal to the first inner diameter D1 of the sheath 8, and, on the other hand, an outer surface 19 which is inscribed in a fifth outer diameter D5 of a value less than the values of said second and third inner diameters D2, D3 of the first and second pieces 12, 13,
  • first and second annular sealing elements 28, 29 are borne by the outer surface 19 of the third piece 18 in such a way as to each co-operate with one of said first and second inner bearing areas 16, 17 of said first and second pieces 12, 13.
  • the third piece 18 is made up of a corrugated tubular material of the same kind as used to constitute the sheath 8.
  • first piece 12 and the second piece 13 have cross sections which are relatively close to the cross section of the sheath, which is a considerable advantage when the available space on the first and second coupling surfaces 4, 5 is limited.
  • the third piece 18 has two opposite ends, referred to as third and fourth 186, 187, and at the level of at least one of these opposite ends the internal surface of the third tubular wall 36 of the third piece defines a guiding surface for the free introduction of the prestressing cable 7 in said third piece 18.
  • the third piece 18 is made up of a corrugated tubular material of the same kind as used to constitute the sheath 8, that is to say made up of a tubular material which comprises alternate curved ridges and curved furrows, at least one of the two opposite ends, said third end 186 and fourth end 187, comprises a part of a ridge in such a manner as to define the aforementioned guiding surface.
  • the coupling device according to the invention is thus adapted to the whole geometry of the cable.
  • the coupling device also takes into account the possibility of a deviation of the cable at the level of the third piece 18.
  • the values of the second and third inner diameters D2, D3 are equal, but this is not compulsory.
  • the first and the second tubular wall 14, 15 which define the first and second inner bearing areas 16, 17 that are provided respectively on the first and the second piece 12, 13, each define in addition a first and a second portion of connection 38, 39 of the first and second pieces 12, 13 to a first and a second end 9, 10 of sheath 8.
  • said first and second portion of connection 38, 39 of the first and second pieces 12, 13 are each formed by a cross-sectional diametral narrowing of said first and second tubular walls 14, 15.
  • the third 30 and fourth 31 stops are each formed by a part of the first and second inner bearing areas 16, 17 which, provided by each of the first and second pieces 12, 13, follows the diametral narrowing of each of said first and second tubular walls 14, 15.
  • said first piece 12 and second piece 13 are achieved by division of an elongated body 40, and this along at least a transversal plane T substantially orthogonal to a longitudinal axis 41 of this body
  • said body comprising the necessary material for said first and second pieces 12, 13.
  • the division can be achieved through cutting into pieces.
  • the elongated body 40 has:
  • the sixth inner diameter D6 is adjusted to correspond to the value of said second and third inner diameters D2, D3, • the inner length of which, referred to as the fourth length L4, is substantially equal to the sum of said second and third lengths L2, L3 selected for said first and second pieces 12, 13,
  • first and second opposite end parts 44, 45 which, referred to as first and second opposite end parts, make up said first and second connection portion 38, 39 and each result from a diametral narrowing of the fourth tubular wall 43 forming the intermediate part 42.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

Coupling device (11) for opposite ends (9, 10) of sheaths (8), having such opposite ends (9, 10), referred to as first and second, these latter having to form parts of prefabricated elements (3) intended to be assembled through pressing of coupling surfaces (4, 5), each prefabricated element (3) including two opposite coupling surfaces, referred to as first and second coupling surfaces (4, 5), this coupling device (11) comprising: - a first and a second piece (12, 13), each intended to be provided respectively on the first and the second end (9, 10) of a sheath (8) which must form part of a prefabricated element (3), each of these first and second ends having to be respectively situated at the level of the first and of the second coupling surface (4, 5), these first and second pieces (12, 13) each having a first and a second tubular wall (14, 15) which define a first and a second inner bearing area (16, 17), - a third piece (18) intended to ensure a leak-tight connection between said first and second pieces (12, 13) which are borne by prefabricated elements (3) intended to come into pressing contact one against the other, this third piece (18) having • on the one hand, an outer surface (19) on which a third and a fourth outer bearing area (20, 21) can be delimited, each intended to co-operate with a first or a second inner bearing area (16, 17) defined by one of said first and second pieces (12, 13) with which a first and a second end (9, 10) of sheath (8) is provided, and • on the other hand, an inner surface (22) intended to delimit an axial channel to ensure a continuity of passage for a prestressing cable (7), between two prefabricated elements (3).

Description

Device for Coupling Sheaths
The invention relates to a device for coupling the ends of sheaths, such as sheaths which have been placed beforehand in prefabricated elements intended to be assembled through reciprocal pressing of the coupling surfaces.
In precast segmental construction, two types of prestressing cables are used, i.e. external unbonded and internal bonded.
The invention concerns precast segmental construction in which internal bonded prestressing cables are used.
The invention refers more specifically to a device for coupling the ends of sheaths, such as sheaths which have been embedded in the prefabricated elements in concrete intended to be assembled through reciprocal pressing of the coupling surfaces.
The invention concerns the field of construction of structures such as bridges, achieved through reciprocal pressing, then holding, of the prefabricated elements in concrete, by means of prestressing cables which pass through the different sheaths situated in the these prefabricated elements.
The invention likewise relates to prefabricated elements which comprise pieces with a view to forming the device of the aforesaid type for coupling the ends of sections of sheaths.
The invention likewise relates to constructions made with prefabricated elements which are provided with devices of the aforesaid type for coupling the ends of sections of sheaths.
In the field of civil engineering, constructions comprising an elongated part of great length, such as a bridge girder, known is to prefabricate said elongated part of the construction in a plurality of sections which, referred to as prefabricated elements, will be able to be subsequently placed in reciprocal pressing contact and assembled on the site of the civil engineering construction.
In general, the prefabricated elements are conceived for assembly through reciprocal pressing along coupling surfaces which are substantially orthogonal to the longitudinal axis of the elongated part to be formed.
For keeping the different prefabricated elements assembled, known is to use prestressing cables which pass through the assembly of the prefabricated elements longitudinally and are tensioned in such as way as to press forcefully the prefabricated elements against one another.
This implies that the cables are able to be passed, i.e. pushed or pulled through the sheaths which have been specially placed in the prefabricated elements during their manufacture.
During the manufacture of the different prefabricated elements, for example by concrete casting, the ends of the sheaths are positioned in such a way as to ensure a continuity of passage at the level of the coupling surfaces between the prefabricated elements.
One result which the invention aims to obtain is a coupling device which allows a continuous sheath to be created across the segments' joints, that is to say a coupling device which
makes it possible to ensure a tight connection between the sheaths so as to stop the entry of external agents in these sheaths and thus work against corrosion, and
also makes it possible to prevent the leakage of substances embedding the cables which are introduced in the sheaths in order to finalize the assembly.
The aim of the invention is to ensure a complete encapsulation of the tendon inside the sheath. The present invention also allows extreme longitudinal tolerances in the expected joints in case of shimming of prefabricated elements.
To this end, the invention has as its object a device of the aforementioned type, according to claim 1.
The invention will be better understood from reading the following description, given by way of non-limiting example, with reference to the attached drawing representing schematically:
Figure 1: a partial lateral view of a civil engineering construction comprising an elongated part constituted by reciprocal pressing of prefabricated elements,
Figure 2: on an enlarged scale, a partial sectional view of two prefabricated elements during reciprocal pressing,
Figure 3: on a scale enlarged still more than Figure 2, a partial sectional view of two prefabricated elements seen immediately after their reciprocal pressing,
Figure 4: a partial sectional view of two prefabricated elements after assembly,
Figure 5: a view in longitudinal section of an elongated body used for production of the coupling device according to the invention,
Figure 6: a view in longitudinal section of the elongated body according to Figure 5, after division,
Figures 7 and 8: two lateral views of a piece likewise used for construction of the device according to the invention. Referring to the drawing (Figure 1), a civil engineering construction 1 can be seen, such as a bridge, comprising an elongated part 2, such as a bridge girder.
The elongated part 2 is composed of a plurality of sections, which are referred to in the following as prefabricated elements 3.
As can be seen from the drawing, the prefabricated elements 3 are designed to be assembled through reciprocal pressing along the coupling surfaces 4, 5, referred to as first and second, which are substantially orthogonal to a longitudinal axis 6 which has the elongated part 2 to be made up.
Each prefabricated element 3 includes two coupling surfaces 4, 5 which are substantially opposite and are referred to as first coupling surface 4 and second coupling surface 5 (Figure 2).
The different prefabricated elements 3 placed in reciprocal pressing contact are held together by means of prestressing cables 7 which, on the one hand, pass through the assembly of prefabricated elements 3 longitudinally, and, on the other hand, are tensioned in such a way as to press forcefully said prefabricated elements 3 against one another, by their first and second coupling surfaces 4, 5 (this assembly technique is known and is not explained in detail in the following).
Each prefabricated element 3 comprises at least one sheath 8 making it possible for the prestressing cable to pass through the element, each sheath having two opposite ends, referred to as first and second end 9, 10.
The first and second ends 9, 10 of the sheath 8 each come out into one of said first and second coupling surfaces 4, 5.
The sheath 8 is of a corrugated type, that is to say comprises ribs to allow transfer of bond forces from the prestressing cables 7 to the prefabricated elements 3. In addition, the first and second ends 9, 10 of each sheath 8 with which a prefabricated element 3 is provided are disposed such that during the assembly of a plurality of prefabricated elements 3 to one another, each of said first and second ends 9, 10 which comes out into a first or second coupling surface 4, 5 is aligned with a first or a second end 9, 10 of another sheath 8 provided in the one of the prefabricated elements 3 which has a first or a second coupling surface 4, 5 opposite thereto.
As has been shown, the first and second ends 9, 10 which are aligned co-operate through a coupling device 11 , the function of which is, in particular, to provide leak-tight connection of sheaths.
The coupling device 11 comprises:
- a first and a second piece 12, 13, each intended to be provided respectively on the first and the second end 9, 10 of a sheath 8 which must form part of a prefabricated element 3, each of these first and second ends having to be respectively situated at the level of the first and of the second coupling surface 4, 5, these first and second pieces 12, 13 each having a first and a second tubular wall 14, 15 which define a first and a second inner bearing area 16, 17,
- a third piece 18 intended to ensure a leak-tight connection between said first and second pieces 12, 13 which are borne by prefabricated elements 3 intended to come into pressing contact one against the other, this third piece 18 having
• on the one hand, an outer surface 19 on which a third and a fourth outer bearing area 20, 21 can be delimited, each intended to co-operate with a first or a second inner bearing area 16, 17 defined by one of said first and second pieces 12, 13 with which a first and a second end 9, 10 of sheath 8 is provided, and • on the other hand, an inner surface 22 intended to delimit an axial channel to ensure a continuity of passage for a prestressing cable 7, between two prefabricated elements 3.
The coupling device 11 is noteworthy in that it comprises:
- first and second pieces 12, 13 having first and second inner bearing areas 16, 17 which are each substantially cylindrical, and a third piece 18 having a third and a fourth outer bearing area 20, 21 which are cylindrical,
• this third piece 18 and at least one of said first and second pieces 12, 13 having dimensions such that the third piece 18 can be placed in a position referred to as the first position P1, in which it is found entirely sheltered in one of said first and second pieces 12, 13,
- elements 23, 24 for longitudinal displacement of the third piece 18 between the first position P1 and a second position P2 in which
• said third outer bearing area 20 of this third piece 18 cooperates with a first bearing area 16 of a first piece 12, and
• said fourth outer bearing area 21 co-operates with a second bearing area 17 of a second piece 13.
The sheath 8 and the coupling device 11 can be installed at angles orthogonal or other than orthogonal to the coupling surfaces 4, 5 of the segments 3.
The coupling device of the invention comprises pieces with longitudinal dimensions that do not need to be of an exact predetermined length. The device for coupling the ends of sheaths of the invention can be used whatever is the angle between the longitudinal axe of the prestressiπg cables 7 and the coupling surfaces 3, 4.
In a non-limiting manner, first and second pieces 12, 13 have first and second inner bearing areas 16, 17 which are each substantially cylindrical and of circular cross section, and a third piece 18 has a third and a fourth outer bearing area 20, 21 which are cylindrical and of circular cross section.
Also in a non-limiting manner, first and second pieces 12, 13 have first and second inner bearing areas 16, 17 which are each substantially cylindrical and of non-circular cross section, and a third piece 18 has a third and a fourth outer bearing area 20, 21 which are cylindrical and of non-circular cross section.
Said aforementioned cross section can be of a square type or of a flattened type such as a rectangular type or oval type.
That the coupling device 11 according to the invention thus does not involve using a sealing element which, to ensure the tightness of the sheath, needs to be compressed in the direction of coming together of the prefabricated elements 3.
During the reciprocal pressing of two prefabricated elements 3, there does not exist therefore any piece of the coupling device 11 which is situated projecting with respect to any one of the first and second coupling surfaces 4, 5.
In a preferable but non-limiting manner :
- on the one hand, the sheath 8 is made of plastics such as polypropylene or polyethylene and the first piece 12 and the second piece 13 are likewise of material of the same nature, and, - on the other hand, said first piece 12 and second piece 13 are each assembled through welding to one of said first 9 and second 10 ends of the sheath 8 through which they must be borne.
Other forms of connections such as fusion weld couplers or the use of mechanical couplers may be envisaged.
Preferably, the third piece 18 is likewise made of plasties such as polypropylene or polyethylene.
These materials are non-corrosive and can therefore create a durable and leak-tight encapsulation of the prestressing cable to form an independent barrier against corrosion around said prestressing cable, in particular across the coupling surfaces 4, 5.
The elements 23, 24 for longitudinal displacement of the third piece 18 between said first position P1 and said second position P2 consist essentially of:
- on the one hand, a first stop 23, situated on the third piece 18 and integral therewith, this stop being able to transmit to said third piece 18 at least one of the actions which are a pushing action and a pulling action, this action being directed so as to bring about the displacement of the third piece 18 between said first and second positions P1, P2,
- on the other hand, a control piece 24 capable of being inserted into a sheath 8 of a prefabricated element 3 in such a way as to have
• a first terminal part 25 bearing at least a second stop 26 intended to co-operate with the first stop 23 of a third piece 18 to enable it to apply at least one of the actions which are a pushing action and a pulling action to bring about its displacement between said first and second positions P1 , P2, • a second terminal part 27 which is situated outside the prefabricated element 3 when the first terminal part 25 cooperates with a first stop 23 of a third piece 18 for the purpose of applying one of said actions of pushing or of pulling intended to displace said third piece 18 between its positions referred to as first P1 and second P2.
In a non-limiting embodiment for implementing the device, the third piece is displaced from its first position P1 toward its second position P2 through pulling on the control piece 24.
In a notable manner, the third piece 18 is made up of a tubular part with an internal face and an external face, and this tubular part is of a corrugated type, that is to say comprising ribs.
The third piece 18 has a first predetermined length L1.
The ribs create depressions in the internal face and projections on the external face, and each depression created in the internal face constitutes a stop which can be used as a first stop 23.
Regardless of whether the third piece 18 is displaced by pulling or by pushing, the control piece 24 consists, for example, of a rod which, at a first end, bears a short bar of a first predetermined longitudinal dimension, connected at its middle to the rod by a hinge.
Preferably, the short bar is held parallel against the rod by a spring.
The bar can be twisted away from the rod, against the action of the spring, by pulling on a string which is connected to said bar and presents a free end situated near a second end of the rod, in such a manner as to be able to be actuated by a person holding the rod by said second end.
The length of the short bar is predetermined in such a manner that, when the string is pulled from the second end of the rod, the two ends of this bar come in contact with the internal face of the third piece, preferably each with a depression created in the internal face.
When the bar rotates, it wedges itself inside the third piece, and allows the third piece to be pulled or pushed in position.
When the third piece has been pulled or pushed in the required position, the string is released which permits the short bar to twist parallel to the rod.
The rod can be removed from the inside of the sheath.
In another embodiment, suitable when the third piece is made up of a tubular part with a circular cross section, the control piece 24 consists of a rod which, at a first end, bears an expandable device.
This device is of a type, on the one hand, able to be radially contracted in order to be introduced in the third piece (or withdrawn from said third piece) and, on the second hand, able to be radially expanded against the internal face of the third piece 18 in order to co-operate with at least one depression of this face and allowing the third piece to be pulled or pushed.
For example, the expandable device comprises :
- a tube which is freely engaged on the length of the rod and able to slide on this rod when it is pushed or pulled by a person,
- a plurality of pairs of branches hinged by a pivoted joint, these pairs of branches being radially disposed around an end of the rod, and one of the branches of each pair having an end connected to the rod and the other branch of the pair having its other end connected to the tube.
In an embodiment: - said first and second inner bearing areas 16, 17 of the first and second pieces 12, 13 are made up of smooth surfaces which are cylindrical,
- the third piece 18 bears at least two annular sealing elements 28, 29 which, referred to as first annular sealing element 28 and second annular sealing element 29, each have a face which forms at least partially one of said third and fourth outer bearing areas 20, 21 that bear said third piece 18, these annular sealing elements 28, 29 are each
• made up of a material elastically deformable by compression,
• connected in a tight way to said third piece 18,
• disposed to co-operate in a tight manner with one of said first and second inner bearing areas 16, 17.
By way of non-limiting example, said first and second annular sealing elements 28, 29 are, for example, O-rings made up of neoprene or similar material, but one skilled in the art is able to select other materials.
Use of said first and second annular sealing elements 28, 29 makes it possible to ensure a leak tightness in the coupling of the ends of the sheath 8.
In a noteworthy way:
- the pieces, referred to as first 12, second 13, bear stops referred to as third 30 and fourth 31, and the third piece 18 bears stops referred to as fifth
32 and sixth 33, and
- the third to the sixth stops 30...33 borne by these first, second and third pieces 12, 13, 18 are disposed to allow them to co-operate two by two and to define said first position P1 and second position P2 of the third piece 18 in one of said first 12 and second 13 pieces. In a noteworthy way:
- in addition to said first and second annular sealing elements 28, 29, the third piece 18 has at least two pressing and centering surfaces 181 to 185 in said first and second inner bearing areas 16, 17 of said first and second pieces 12, 13, and
- at least two of these two pressing and centering surfaces 181 to 185 are situated in the zones defined for the first and second outer bearing areas 20, 21 of this third piece 18 in such a way as to ensure its centering in each of said first and second positions P1 , P2.
The dimensions of the pressing and centering surfaces 181 to 185 are selected so as to ensure the functions of pressing and centering of the third piece 18 in the first and second inner bearing area 16, 17, without impeding the function of tightness obtained through said first and second annular sealing elements.
In a noteworthy and preferred way, the third piece 18 consists of a tubular wall piece, referred to as third tubular wall 36, with a first predetermined length L1 between two opposite end faces 34, 35, referred to as first end face 34 and second end face 35, and the fifth 32 and sixth 33 stops borne by the third piece 18 are each made up of a portion of the surface formed by said first and second end faces 34, 35.
In a noteworthy way:
- one of said first and second pieces 12, 13 has, inside, a second length l_2 which is at least equal to the first length L1 of the third piece 18, and
- the other of said first and second pieces 12, 13 has, inside, a third length L3 which is at least equal to a portion of half the first length L1 of the third piece 18.
Preferably: - one of said first and second pieces 12, 13 has, inside, a second length L2 which is at least equal to the first length L1 of the third piece 18, and
- the other of said first and second pieces 12, 13 has, inside, a third length L3 which is at least equal to half the first length L1 of the third piece 18.
In a noteworthy way, the sheath 8 has a wall defining an inner passage with a first inner diameter of predetermined value D1 , and:
- the first and second inner bearing areas 16, 17 of said first and second pieces 12, 13 each have a second and a third inner diameter D2, D3 which are of substantially equal value to one another, but each is a value greater than the value of the first inner diameter D1 of the sheath 8,
- the third tubular wall 36 of the third piece 18 defines, on the one hand, an inner surface 22 having a fourth inner diameter D4 which is substantially equal to the first inner diameter D1 of the sheath 8, and, on the other hand, an outer surface 19 which is inscribed in a fifth outer diameter D5 of a value less than the values of said second and third inner diameters D2, D3 of the first and second pieces 12, 13,
- the first and second annular sealing elements 28, 29 are borne by the outer surface 19 of the third piece 18 in such a way as to each co-operate with one of said first and second inner bearing areas 16, 17 of said first and second pieces 12, 13.
In a preferable but non-limiting manner, the third piece 18 is made up of a corrugated tubular material of the same kind as used to constitute the sheath 8.
One skilled in the art will know how to determine the values of the different inner (D1 to D4) and outer (D5) diameters in particular as a function of:
• the possible variations in concentricity between the first piece and the second piece 12, 13, •possible dimensional variations resulting from fabrication tolerances,
•possible dimensional variations resulting from temperature,
•possible dimensional variations owing to errors in positioning of the prefabricated elements 3 which bear said first piece 12 and second piece 13 and to errors in positioning of each of said first and second pieces 12, 13 in the prefabricated element 3 which bears it.
That being as it may, it is to be noted that the first piece 12 and the second piece 13 have cross sections which are relatively close to the cross section of the sheath, which is a considerable advantage when the available space on the first and second coupling surfaces 4, 5 is limited.
In a notable manner, the third piece 18 has two opposite ends, referred to as third and fourth 186, 187, and at the level of at least one of these opposite ends the internal surface of the third tubular wall 36 of the third piece defines a guiding surface for the free introduction of the prestressing cable 7 in said third piece 18.
When the third piece 18 is made up of a corrugated tubular material of the same kind as used to constitute the sheath 8, that is to say made up of a tubular material which comprises alternate curved ridges and curved furrows, at least one of the two opposite ends, said third end 186 and fourth end 187, comprises a part of a ridge in such a manner as to define the aforementioned guiding surface.
The coupling device according to the invention is thus adapted to the whole geometry of the cable.
The coupling device also takes into account the possibility of a deviation of the cable at the level of the third piece 18.
In the example shown, the values of the second and third inner diameters D2, D3 are equal, but this is not compulsory. In a noteworthy way, the first and the second tubular wall 14, 15 which define the first and second inner bearing areas 16, 17 that are provided respectively on the first and the second piece 12, 13, each define in addition a first and a second portion of connection 38, 39 of the first and second pieces 12, 13 to a first and a second end 9, 10 of sheath 8.
In a notable way, said first and second portion of connection 38, 39 of the first and second pieces 12, 13 are each formed by a cross-sectional diametral narrowing of said first and second tubular walls 14, 15.
In a noteworthy way, the third 30 and fourth 31 stops, with which the first and second pieces 12, 13 are provided, are each formed by a part of the first and second inner bearing areas 16, 17 which, provided by each of the first and second pieces 12, 13, follows the diametral narrowing of each of said first and second tubular walls 14, 15.
In a noteworthy way, said first piece 12 and second piece 13 are achieved by division of an elongated body 40, and this along at least a transversal plane T substantially orthogonal to a longitudinal axis 41 of this body
40, said body comprising the necessary material for said first and second pieces 12, 13.
For example, the division can be achieved through cutting into pieces.
In a notable way, the elongated body 40 has:
- an intermediate part 42 formed by a fourth substantially tubular wall 43,
• the inner diameter value of which, referred to as the sixth inner diameter D6, is adjusted to correspond to the value of said second and third inner diameters D2, D3, • the inner length of which, referred to as the fourth length L4, is substantially equal to the sum of said second and third lengths L2, L3 selected for said first and second pieces 12, 13,
- two opposite end parts 44, 45, which, referred to as first and second opposite end parts, make up said first and second connection portion 38, 39 and each result from a diametral narrowing of the fourth tubular wall 43 forming the intermediate part 42.
The positioning of said first and second pieces 12, 13 in a manufacturing mold (not shown) for a prefabricated element 3 is achieved in a known way.
To be more precise, one proceeds in the same manner as that used for the positioning of the ends 9, 10 of a sheath 8 in the mold, i.e. by means of positioning pieces which are fixed on the molding surfaces and on which the ends of the sheath are fitted together to be held during the making of the element, e.g. a manufacturing such as that by casting material such as concrete.

Claims

Claims
1. Coupling device (11) for opposite ends (9, 10) of sheaths (8), having such opposite ends (9, 10), referred to as first and second, these latter having to form parts of prefabricated elements (3) intended to be assembled through pressing of coupling surfaces (4, 5), each prefabricated element (3) including two opposite coupling surfaces, referred to as first and second coupling surfaces (4, 5),
this coupling device (11) comprising:
- a first and a second piece (12, 13), each intended to be provided respectively on the first and the second end (9, 10) of a sheath (8) which must form part of a prefabricated element (3), each of these first and second ends having to be respectively situated at the level of the first and of the second coupling surface (4, 5), these first and second pieces (12, 13) each having a first and a second tubular wall (14, 15) which define a first and a second inner bearing area (16, 17),
- a third piece (18) intended to ensure a leak-tight connection between said first and second pieces (12, 13) which are borne by prefabricated elements (3) intended to come into pressing contact one against the other, this third piece (18) having
• on the one hand, an outer surface (19) on which a third and a fourth outer bearing area (20, 21) can be delimited, each intended to co-operate with a first or a second inner bearing area (16, 17) defined by one of said first and second pieces (12, 13) with which a first and a second end (9, 10) of sheath (8) is provided, and
• on the other hand, an inner surface (22) intended to delimit an axial channel to ensure a continuity of passage for a prestressing cable (7), between two prefabricated elements (3), said coupling device (11 ) being characterized in that it comprises:
- first and second pieces (12, 13) having first and second inner bearing areas (16, 17) which are each substantially cylindrical, and a third piece (18) having a third and a fourth outer bearing area (20, 21 ) which are cylindrical,
• this third piece (18) and at least one of said first and second pieces (12, 13) having dimensions such that the third piece (18) can be placed in a position referred to as the first position (P1 ), in which it is found entirely sheltered in one of said first and second pieces (12, 13),
- elements (23, 24) for longitudinal displacement of the third piece
(18) between the first position (P1) and a second position (P2) in which
• said third outer bearing area (20) of this third piece (18) cooperates with a first bearing area (16) of a first piece (12), and
• said fourth outer bearing area (21) co-operates with a second bearing area (17) of a second piece (13).
2. Coupling device according to claim 1 , characterized in that the elements (23, 24) for longitudinal displacement of the third piece (18) between said first position (P1) and said second position (P2) consist essentially of:
- on the one hand, a first stop (23), situated on the third piece (18) and integral therewith, this stop being able to transmit to said third piece (18) at least one of the actions which are a pushing action and a pulling action, this action being directed so as to bring about the displacement of the third piece (18) between said first and second positions (P1, P2),
- on the other hand, a control piece (24) capable of being inserted into a sheath (8) of a prefabricated element (3) in such a way as to have • a first terminal part (25) bearing at least a second stop (26) intended to co-operate with the first stop (23) of a third piece (18) to enable it to apply at least one of the actions which are a pushing action and a pulling action to bring about its
5 displacement between said first and second positions (P1,
P2),
• a second terminal part (27) which is situated outside the prefabricated element (3) when the first terminal part (25) cooperates with a first stop (23) of a third piece (18) for the o purpose of applying one of said actions of pushing or of pulling intended to displace said third piece (18) between its positions referred to as first (P1 ) and second (P2).
3. Coupling device according to claim 1 or 2, characterized in that
- said first and second inner bearing areas (16, 17) of the first and s second pieces (12, 13) are made up of smooth surfaces which are cylindrical,
- the third piece (18) bears at least two annular sealing elements (28, 29) which, referred to as first annular sealing element (28) and second annular sealing element (29), each have a face which forms at least partially one of said third and fourth outer bearing areas (20, 21 ) that bear said third o piece (18), these annular sealing elements (28, 29) are each
• made up of a material elastically deformable by compression,
• connected in a tight way to said third 5 piece (18),
• disposed to co-operate in a tight manner with one of said first and second inner bearing areas (16, 17). 0
4. Coupling device according to any one of the claims 1 to 3, characterized in that - the pieces referred to as first (12), second (13) bear stops referred to as third (30) and fourth (31), and the third piece (18) bears stops referred to as fifth (32) and sixth (33), and
- the third to the sixth stops (30...33) borne by these first, second and third pieces (12, 13, 18) are disposed to allow them to co-operate two by two and to define said first position (P1 ) and second position (P2) of the third piece (18) in one of said first (12) and second (13) pieces.
5. Coupling device according to any one of the claims 1 to 4, characterized in that
- in addition to said first and second annular sealing elements (28, 29), the third piece (18) has at least two pressing and centering surfaces (181) to (185) in said first and second inner bearing areas (16, 17) of said first and second pieces (12, 13), and
- at least two of these two pressing and centering surfaces (181) to
(185) are situated in the zones defined for the first and second outer bearing areas (20, 21) of this third piece (18) in such a way as to ensure its centering in each of said first and second positions (P1 , P2).
6. Coupling device according to any one of the claims 1 to 5, characterized in that the third piece (18) consists of a tubular wall piece, referred to as third tubular wall (36), with a first predetermined length (L1) between two opposite end faces (34, 35), referred to as first end face (34) and second end face (35), and the fifth (32) and sixth (33) stops borne by the third piece (18) are each made up of a portion of the surface formed by said first and second end faces (34, 35).
7. Coupling device according to claim 6, characterized in that
- one of said first and second pieces (12, 13) has, inside, a second length (L2) which is at least equal to the first length (L1) of the third piece (18), and - the other of said first and second pieces (12, 13) has, inside, a third length (L3) which is at least equal to half the first length (L1 ) of the third piece (18).
8. Coupling device according to any one of the claims 3 to 7, 5 characterized in that the sheath (8) has a wall defining an inner passage with a first inner diameter of predetermined value (D1), and:
- the first and second inner bearing areas (16, 17) of said first and second pieces (12, 13) each have a second and a third inner diameter (D2, D3) which are of substantially equal value to one another, but each is a value Q greater than the value of the first inner diameter (D1 ) of the sheath (8),
- the third tubular wall (36) of the third piece (18) defines, on the one hand, an inner surface (22) having a fourth inner diameter (D4) which is substantially equal to the first inner diameter (D1) of the sheath (8), and, on the other hand, an outer surface (19) which is inscribed in a fifth outer diameter s (D5) of a value less than the values of said second and third inner diameters (D2, D3) of the first and second pieces (12, 13),
- the first and second annular sealing elements (28, 29) are borne by the outer surface (19) of the third piece (18) in such a way as to each cooperate with one of said first and second inner bearing areas (16, 17) of said o first and second pieces (12, 13).
9. Coupling device according to any one of the claims 1 to 8, characterized in that the first and the second tubular wall (14, 15) which define the first and second inner bearing areas (16, 17) that are provided respectively on the first and the second piece (12, 13), each define in addition a first and a 5 second portion of connection (38, 39) of the first and second pieces (12, 13) to a first and a second end (9, 10) of sheath (8).
10. Coupling device according to claim 9, characterized in that said first and second portion of connection (38, 39) of the first and second pieces (12, 13) are each formed by a diametral narrowing of said first and second tubular walls (14, 15).
11. Coupling device according to claim 10, characterized in that the third (30) and fourth (31) stops, with which the first and second pieces (12, 13) are provioded, are each formed by a part of the first and second inner bearing areas (16, 17) which, provided by each of the first and second pieces (12, 13), follows the diametral narrowing of each of said first and second tubular walls (14, 15).
12. Coupling device according to any one of the claims 1 to 11, characterized in that said first piece (12) and second piece (13) are achieved by division of an elongated body (40), and this along at least a transversal plane (T) substantially orthogonal to a longitudinal axis (41 ) of this body (40), said body comprising the necessary material for said first and second pieces (12, 13).
13. Coupling device according to claim 10, characterized in that the elongated body (40) has:
- an intermediate part (42) formed by a fourth substantially tubular wall (43),
• the inner diameter value of which, referred to as the sixth inner diameter (D6), is adjusted to correspond to the value of said second and third inner diameters (D2, D3),
• the inner length of which, referred to as the fourth length (L4), is substantially equal to the sum of said second and third lengths (L2, L3) selected for said first and second pieces (12, 13),
- two opposite end parts (44, 45), which, referred to as first and second opposite end parts, make up said first and second connection portion (38, 39) and each result from a diametral narrowing of the fourth tubular wall (43) forming the intermediate part (42).
14. Coupling device according to any one of the claims 1 to 11, characterized in that said third piece (18) has two opposite ends, referred to as third and fourth (186, 187), and at the level of at least one of these opposite ends the internal surface of the third tubular wall (36) of the third piece defines a guiding surface for the free introduction of the prestressing cable (7) in said third piece (18).
15. Prefabricated elements comprising pieces for the purpose of making up the coupling device according to any one of the claims 1 to 14
16. Civil engineering constructions with prefabricated elements provided with coupling devices according to any one of the claims 1 to 14.
EP05717140A 2005-03-23 2005-03-23 Device for coupling sheaths Active EP1861562B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/051358 WO2006099900A2 (en) 2005-03-23 2005-03-23 Device for coupling sheaths

Publications (2)

Publication Number Publication Date
EP1861562A2 true EP1861562A2 (en) 2007-12-05
EP1861562B1 EP1861562B1 (en) 2010-10-27

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US9879804B2 (en) 2013-06-17 2018-01-30 Structural Technologies, Llc Duct coupler devices, systems, and related methods
EP3084097B8 (en) * 2013-12-20 2019-03-20 CCL Stressing International Limited A construction and a method of making a construction
FR3040748B1 (en) 2015-09-07 2017-08-25 Airbus Helicopters ROLLING CONTROL, MECHANICAL SYSTEM AND AIRCRAFT
CN106049294B (en) * 2016-08-03 2018-02-06 中国铁路总公司 The girder pre-stressed duct connector of section assembling
JP6820208B2 (en) * 2017-01-26 2021-01-27 阪神高速道路株式会社 Joint structure of precast concrete block and joint structure of precast concrete block
JP2018123672A (en) * 2017-02-02 2018-08-09 東拓工業株式会社 Gap filling sheath joint, sheath pipe path including the same and construction method therefor

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DE3824107A1 (en) * 1988-06-27 1990-03-15 Werner Zapf MULTIPLE REINFORCED CONCRETE CONSTRUCTION COMPONENTS IN A TENSILE CONCRETE CONSTRUCTION
JPH0639764B2 (en) * 1989-03-27 1994-05-25 ドーピー建設工業株式会社 Gadget sheath and how to attach the padded sheath to the bridge girder
JP3288357B2 (en) * 1999-10-28 2002-06-04 株式会社ピー・エス Construction method of joint of precast concrete beam and column and construction method of beam column frame

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EP1861562B1 (en) 2010-10-27
WO2006099900A2 (en) 2006-09-28

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