EP3543418B1 - Procédé de raccordement de conduits de tendon de segments préfabriqués et structure résultante - Google Patents
Procédé de raccordement de conduits de tendon de segments préfabriqués et structure résultante Download PDFInfo
- Publication number
- EP3543418B1 EP3543418B1 EP18305330.5A EP18305330A EP3543418B1 EP 3543418 B1 EP3543418 B1 EP 3543418B1 EP 18305330 A EP18305330 A EP 18305330A EP 3543418 B1 EP3543418 B1 EP 3543418B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ducts
- segments
- recesses
- segment
- uhpfrc
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 31
- 210000002435 tendon Anatomy 0.000 title claims description 28
- 239000004567 concrete Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000011210 fiber-reinforced concrete Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000011440 grout Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
Definitions
- the present invention relates to the assembly of precast construction segments (PCS) for building pre-stressed structures such as post-tensioned concrete segmental structures.
- PCS precast construction segments
- These segments are preferably made in accordance with a match cast method to ensure a very closely fitting joint.
- connection of ducts at the joint of two adjacent segments is exposed to a risk of infiltrations of various corroding substances such as deicing solutions and achieving a good seal at the joint if required.
- grout is often injected into the ducts to create a mechanical bound between the tendons and the concrete of the segments and help protect the tendons from corrosion. This grout must not escape from the ducts during injection.
- the joint between two consecutive segments can be made according to a so-called “dry joint” process where the segments are placed side by side without any interface product or according to a so-called “glued joint” process where an adhesive such as epoxy paste is introduced between the segments.
- dry joint process where the segments are placed side by side without any interface product
- glued joint process where an adhesive such as epoxy paste is introduced between the segments.
- the sealing at the junction of ducts also needs to prevent the adhesive from penetrating into the ducts and hinder the further introduction of the tendons.
- pneumatic tests are carried out to check the quality of the sealing before installing the tendons and injecting the grout. If leaks are detected in some ducts, the injection of grout is rendered more difficult and some extra work is needed to guarantee the tendons will be preserved from corrosion.
- Some existing duct couplers are formed of many components and are expensive and complex to use.
- FR-A-2 596 439 discloses a device to insert between sections of pre-stressing ducts, comprising a cylindrical sleeve engaged between the openings of two adjacent sections to ensure the continuity of the ducts, and an elastic seal surrounding the cylindrical sleeve to ensure sealing and compensate for the positioning variations and dimensional deviations of the adjacent segments which are assembled against each other.
- WO 99/043910 discloses a device to engage in the ducts to connect the adjacent sections in a sealed manner.
- An object of the present invention is thus to propose a simple and efficient solution to the problem of achieving a duct continuity that would pass the air tightness test mentioned above with repeatability and even in situations when the tendons are inclined in the webs.
- a further object of the invention is to provide a solution that is reliable and easy to implement.
- the invention achieves this goal thanks to a method according to claim 1 for establishing an air-tight connection between post-tensioning tendon ducts of two consecutive precast match cast segments of a structure, each segment being cast with a recess (also called a "box-out") opening out on a jointing face of the segment leaving an access to duct ends, the method comprising:
- air tight connection it is meant a connection that passes a pneumatic test usually performed for testing the quality of the connection for this type of structure and preferably a connection that passes the 0,1bar test referred to above.
- the sealing material is preferably a High Performance Concrete (HPC) and most preferably an Ultra High Performance Fibre Reinforced Concrete (UHPFRC).
- HPC High Performance Concrete
- UHPFRC Ultra High Performance Fibre Reinforced Concrete
- UHPFRC provides an air-tight, long term durable "coupling" between the ducts which will not crack nor allow ingress of any contaminant due to its complete lack of porosity and extreme durability.
- the method provides a simple way to obtain the air tightness connection at a similar or lower cost compared to the use of known couplers.
- the invention allows obtaining an air tightness connection even for tendons that are significantly deviated at the joints.
- connection of the duct ends of a pair at step a) does not need to provide air-tightness as if suffices it prevents ingress of the UHPFRC into the ducts during filling of the recesses with that material.
- thermo-retractable sleeve that is pre-fixed on one of the duct ends of a pair of ducts.
- the length of such sleeve ranges for example from 70 mm to 130 mm.
- the sleeve is slid over and sealed onto the pair of ducts before UHPFRC is poured.
- This sleeve is a non-structural element that aims to prevent ingress of the UHPFRC into the ducts when UHPFRC is poured into the recesses.
- the sliding and sealing of the sleeve may take place or not after the tendons are threaded into the ducts.
- an adhesive tape wounded around the duct ends may also be used.
- the segments are deprived of reinforcement bars protruding out into the recesses, as the use of UHPFRC negates the need to reinforce the infill concrete connection.
- Step b) may take place concurrently with tendon threading.
- HPC concrete is a concrete with a compressive strength equal or exceeding 70 MPa.
- UHPRFC concrete is a concrete with a compressive strength usually exceeding 150 MPa, and of at least 120 MPa.
- the UHPRFC comprises fibres that ensure tensile strength with a ductile behavior.
- the UHPRFC has a relatively high content of binder, which leads to the absence of capillary porosity.
- the UHPRFC has a dense matrix.
- the water/binder ratio (w/b) of UHPFRC typically lies between 0,16 and 0,2.
- the recesses are provided in a lower slab and/or an upper slab of the segments and open out into the top surface of the lower slab and/or upper slab. These recesses may be adjacent the lateral walls (also called "webs") of the segments.
- the segments are made using match casting technique.
- the segments may be box segments, for example one-cell box segments.
- the method may comprise testing the air-tightness of the connection of the ducts.
- the method comprises the following steps for casting the segments (10):
- the reinforcing bars may be curtailed so as not to extend within the recesses.
- a further aspect of the invention is a method according to claim 13 for building a segmental structure comprising assembling precast match cast segments, with match cast joints, in the continuity of each other, each segment comprising post-tensioning tendon ducts, the method comprising implementing the method as defined above for connecting the ducts.
- a further aspect of the invention is a segmental structure according to claim 14, made in accordance with the method as defined above, preferably a bridge deck, comprising at least two precast match cast segments incorporating ducts in which tensioning tendons are threaded, the ducts being connected together at the joint of the segments by at least one block of a sealing material, preferably Ultra High Performance Fibre Reinforced Concrete (UHPFRC), extending around duct ends of the two adjacent segments, this block extending into adjacent recesses of the segments each opening out on a jointing face of the segments.
- UHPFRC Ultra High Performance Fibre Reinforced Concrete
- the joint between the two consecutive segments preferably comprise two such blocks. These blocks preferably each extend inwardly of the adjacent lateral wall (or web) of the segments, in the bottom slab. The blocks preferably open out on top of the bottom slab, in the corner thereof.
- segmental structure 1 such as a bridge deck made of several precast segments 10 with match-cast coupling surfaces.
- Each segment 10 is in this example a one-cell box concrete segment comprising a bottom slab 11, two symmetrically inclined lateral walls (or webs) 12 and a top slab 13 extending in cantilever fashion beyond the walls (or webs) 12 to define a width of the bridge deck.
- each segment 10 is delimited by a rear face 14 and a front face 15.
- the rear face 14 is intended to come into contact against the front face 15 of the previous segment installed on the structure during construction.
- the front face 15 of each segment 10 is intended to receive the rear face 14 of the next segment 10.
- the jointing faces 14, 15 of the adjacent segments 10 are provided with a number of interlocking reliefs 17 ensuring a good shear resistance of the joint and helping relative positioning of the segments as well when they are brought together.
- these reliefs 17 are located on the end faces of the lateral walls (or webs) 12 of the segments 10.
- the interlocking reliefs 17 may comprise raised keys each in the shape of a rectangular prism with tapered sides to provide mechanical interlock for accurate location and shear resistance.
- the segments 10 are match cast, which means that when casting a segment, the jointing face is match cast against its previously cast mating segment so that this segment can act as a former or as part of the mould for this new segment.
- Each segment 10 comprises a number of longitudinal tendon ducts 20, intended to receive post tensioning tendons. These tendons are anchored at their ends by means of any appropriate anchoring devices (not shown).
- the ducts 20 are connected through blocks 30 of a sealing material that prevents ingress of corrosive substances and provides mechanical resistance.
- this sealing material is UHPFRC.
- the blocks 30 extend at the joint of two consecutive segments 10 on the bottom slab 11 near the lateral walls (or webs) 12.
- Each segment 10 is cast with a recess 40 opening out in the jointing face of the segment 10 and in the top face of the bottom slab 11, as shown in FIG.6 .
- an insert (not shown) with appropriate shape is placed in the mould used to cast the segment 10. This insert is preferably reusable.
- the bottom slab 11 comprises reinforcing bars (not shown) but these bars are curtailed not to extend into the recess 40. This facilitates the casting thereof.
- each recess 40 may taper inwardly going upward as shown in FIG.7A . This helps retain the block 30 in the bottom slab 11, as the two rear faces 43 converge upward.
- the outer side face 44 of the recess 40 may extend in the continuity and alignment of the inner face of the adjacent wall (or web) 12, as shown in FIG.3 .
- thermo-retractable sleeve 21 may be pre-fixed (for example threaded or installed otherwise) on one duct end of each pair, as shown, and slid over the other duct end as shown in FIG.7B . Then the sleeve 21 is sealed on the ducts 20. This connection prevents ingress of UHPFRC into the ducts 20.
- UHPFRC is then poured into the space 47 to fill in the recesses 40 and make the block 30 extending around the duct ends 20, as shown in FIG.7C .
- UHPFRC is expected to reach a strength of far more than 50 MPa in less than 24 hours and exhibit a stiffness at least equal to that of equivalent strength normal concrete so the stressing operation is not impacted.
- the filling in of the recesses 40 takes place concurrently with tendon threading inside the ducts.
- Each block 30 connects the incorporated ducts 20 in an air-tight fashion and enables the connection to pass the 0,1 bar pneumatic test defined above. Furthermore, each block 30 provides the required mechanical resistance at the junction.
- Each block 30 may have a depth d 7 (measured along the longitudinal axis of the structure) ranging between 150 and 350 mm, for example of about 250 mm.
- the thickness d 1 of UHPFRC extending below the ducts 20 may range from 40 to 60 mm, being for example of about 50 mm.
- the thickness d 2 of the bottom slab 11 below each recess 40 may range from 25 to 35 mm, being for example of about 30 mm.
- the thickness d 3 of UHPFRC above the ducts 20 where the blocks 30 are thinner, i.e. at their inner side, may range from 75 to 85 mm, being for example of about 80 mm.
- the width d 4 of the blocks 30 may range from 750 to 1250 mm, being for example of about 1050 mm.
- the blocks 30 may have a bottom face 41 that is inclined downwards toward the jointing face.
- the upper edge of the face 41 may be spaced from the ducts 20 by a distance d 6 as shown in FIG.5 that ranges from 15 to 25 mm, being for example of about 20 mm.
- the thickness d 5 of UHPFRC at the lower edge of face 41 below the ducts 20 is higher and may range from 50 to 60 mm, being for example of about 55 mm.
- the volume of infill UHPFRC may be about 0.2 m 3 per joint and may be prepared easily on site.
- the invention applies to other segmental structures, for example to two-cell box segments 10.
- tendon ducts may be provided elsewhere on the segments, for example in the top slab and/or in the lateral walls (or webs).
- the number of pairs of ducts 20 connected by each block 30 may vary.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Claims (14)
- Procédé permettant d'établir un raccord étanche à l'air entre des conduits de tendon de post-tension (20) de deux segments préfabriqués coulés par emboîtement consécutifs (10) d'une structure, ledit procédé étant caractérisé en ce que chaque segment (10) est coulé avec un évidement (40) débouchant sur une face de jonction (14 ; 15) du segment laissant un accès aux extrémités des conduits (20), le procédé comprenant :a) le raccord de paires d'extrémités de conduits (20) respectives des deux segments (10) consécutifs entre elles, etb) le versement d'un matériau d'étanchéité dans les évidements (40) des deux segments consécutifs autour des extrémités de conduits (20) tout en empêchant le matériau de pénétrer dans l'espace intérieur des conduits, formant ainsi un raccord étanche à l'air au niveau de la jonction de conduits.
- Procédé selon la revendication 1, le matériau d'étanchéité étant un béton renforcé par des fibres à très haute performance (BFUP).
- Procédé selon l'une quelconque des revendications 1 et 2, les segments (10) étant dépourvus de barres d'armature faisant saillie dans les évidements (40).
- Procédé selon l'une quelconque des revendications 1 à 3, un manchon thermorétractable (21) étant préfixé, notamment enfilé ou installé autrement, sur l'une des extrémités de conduits (20) d'une paire de conduits, la longueur du manchon (21) étant de préférence comprise entre 70 mm et 130 mm, et le manchon (21) étant ensuite glissé et scellé sur la paire de conduits (20).
- Procédé selon l'une quelconque des revendications 1 à 3, un tube gonflable ou un ballon gonflable étant introduit dans les conduits et gonflé avant que le matériau d'étanchéité ne soit versé de manière à sceller la partie intérieure du joint entre les conduits.
- Procédé selon l'une quelconque des revendications 1 à 5, l'étape b) ayant lieu en même temps que l'enfilage de tendon.
- Procédé selon l'une quelconque des revendications 1 à 6, les évidements (40) étant fournis dans une dalle inférieure ou supérieure (11) des segments (10) et débouchant dans la surface supérieure de ladite dalle inférieure ou supérieure (11).
- Procédé selon la revendication 7, les évidements (40) étant adjacents aux parois latérales (12) des segments (10).
- Procédé selon l'une quelconque des revendications 1 à 8, les segments (10) étant des segments de boîte.
- Procédé selon l'une quelconque des revendications 1 à 9, comprenant le test de l'étanchéité à l'air du raccord des conduits.
- Procédé selon l'une quelconque des revendications 1 à 10, le coulage des segments (10) comprenant :a) le positionnement dans un moule :∘ des conduits (20) pour le passage des tendons de tension,∘ des inserts destinés à réaliser des évidements (40) dans lesquels les extrémités des conduits s'étendent,∘ des barres d'armature,b) le versement du béton dans le moule.
- Procédé selon la revendication 11, les barres d'armature étant raccourcies de manière à ne pas s'étendre à l'intérieur des évidements (40).
- Procédé de construction d'une structure segmentaire (1) comprenant l'assemblage de segments préfabriqués coulés par emboîtement (10) avec des joints coulés par emboîtement, dans la continuité les uns des autres, chaque segment (10) comprenant des conduits de tendon de post-tension (20), le procédé comprenant la mise en œuvre du procédé selon l'une quelconque des revendications 1 à 10 pour le raccordement des conduits (20).
- Structure segmentaire (1) réalisée selon la revendication 13, de préférence tablier de pont, comprenant au moins deux segments préfabriqués coulés par emboîtement (10) incorporant des conduits (20) dans lesquels des tendons de tension sont enfilés, les conduits (20) étant raccordés entre eux au niveau de la jonction des segments (10) par au moins un bloc (30) de béton renforcé par des fibres à très haute performance (BFUP) s'étendant autour des extrémités de conduits (20) des deux segments adjacents, ce bloc s'étendant dans des évidements adjacents (40) des segments débouchant sur une face de jonction (14 ; 15) des segments.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18305330.5A EP3543418B1 (fr) | 2018-03-23 | 2018-03-23 | Procédé de raccordement de conduits de tendon de segments préfabriqués et structure résultante |
US16/361,533 US20190292785A1 (en) | 2018-03-23 | 2019-03-22 | Method for connecting precast segments tendon ducts and resulting structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18305330.5A EP3543418B1 (fr) | 2018-03-23 | 2018-03-23 | Procédé de raccordement de conduits de tendon de segments préfabriqués et structure résultante |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3543418A1 EP3543418A1 (fr) | 2019-09-25 |
EP3543418B1 true EP3543418B1 (fr) | 2021-05-12 |
Family
ID=61868481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18305330.5A Active EP3543418B1 (fr) | 2018-03-23 | 2018-03-23 | Procédé de raccordement de conduits de tendon de segments préfabriqués et structure résultante |
Country Status (2)
Country | Link |
---|---|
US (1) | US20190292785A1 (fr) |
EP (1) | EP3543418B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101989167B1 (ko) * | 2018-11-23 | 2019-09-30 | 한국건설기술연구원 | 이중웨브를 이용한 중공형 합성보 및 그 시공방법 |
JP7428613B2 (ja) | 2020-08-20 | 2024-02-06 | 三井住友建設株式会社 | プレキャストコンクリート壁内埋設管の継手部材及びその使用方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7686347B1 (en) * | 2007-09-25 | 2010-03-30 | Sorkin Felix L | Couplers for use with ducts of concrete segmental construction |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1248269B (de) * | 1963-01-16 | 1967-08-24 | Hochtief Ag Hoch Tiefbauten | Laengenveraenderliche Huellrohrmanschette fuer Spanngliedkanaele |
DE1559491B1 (de) * | 1965-03-12 | 1970-06-04 | Walter Dipl Ing Christmann | Fugenausbildung zwischen betonfertigbauteilen mit querlaufendem spanngliedkanal sowie verfahren zu ihrer herstellung |
FR2229264A5 (fr) * | 1973-05-08 | 1974-12-06 | Campenon Bernard Europe | |
DE3730574A1 (de) * | 1987-09-11 | 1989-03-23 | Signode System Gmbh | Verfahren und vorrichtungen zum abschliessen des spaltraumes zwischen einem letzten streckenausbaurahmen und dem gebirge beim vortrieb von strecken |
DE3824107A1 (de) * | 1988-06-27 | 1990-03-15 | Werner Zapf | Aus mehreren stahlbetonfertigteilen zusammengefuegter baukoerper in einer spannbetonbauweise |
JP2580476B2 (ja) * | 1993-10-30 | 1997-02-12 | ハツミ産業株式会社 | Pcコンクリートパネルおよびその施工方法 |
FR2775492B1 (fr) * | 1998-02-27 | 2000-05-05 | Freyssinet Int Stup | Elements de construction prefabriques, ouvrage precontraint realise avec de tels elements et procede de fabrication de tels elements |
JP2001032211A (ja) * | 1999-05-17 | 2001-02-06 | Anderson Technology Kk | 外ケーブルを配設した橋梁の箱桁構造及び同箱桁の構築方法 |
FR2970724B1 (fr) * | 2008-10-06 | 2014-01-03 | Freyssinet | Raccordement de troncons de gaine de precontrainte d'un ouvrage ayant une serie d'elements prefabriques. |
US20130117256A1 (en) | 2010-07-22 | 2013-05-09 | Bing Gu | Sql enumerator |
EP3176325A1 (fr) * | 2014-07-31 | 2017-06-07 | Pgpi - Marcas E Patentes S.A. | Procédé de construction de structures avec segments creux et système de construction avec segments creux |
JP6656875B2 (ja) * | 2015-10-19 | 2020-03-04 | 鹿島建設株式会社 | プレキャスト部材の接合方法 |
CA3023054C (fr) * | 2016-05-11 | 2021-01-12 | Joel Foderberg | Systeme pour panneaux muraux composites en beton isoles |
WO2018232019A1 (fr) * | 2017-06-13 | 2018-12-20 | Tindall Corporation | Procédés et appareils pour relier des éléments structurels en béton |
US9988775B1 (en) * | 2017-12-04 | 2018-06-05 | The Florida International University Board Of Trustees | Concrete i-beam for bridge construction |
-
2018
- 2018-03-23 EP EP18305330.5A patent/EP3543418B1/fr active Active
-
2019
- 2019-03-22 US US16/361,533 patent/US20190292785A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7686347B1 (en) * | 2007-09-25 | 2010-03-30 | Sorkin Felix L | Couplers for use with ducts of concrete segmental construction |
Also Published As
Publication number | Publication date |
---|---|
US20190292785A1 (en) | 2019-09-26 |
EP3543418A1 (fr) | 2019-09-25 |
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