Patent GB-431602-A (GB)
Title: Improvements in expansion joints for concrete roads or pavements
IPC: E01C11/14
Filed: 1934-04-21
Abstract: 431,602. Expansion joints for concrete roads. EICHELMAN, W. H., 221, North La Salle Street, HALL, E. E., 123, West Madison Street, WHEALAN, E., and WHEALAN, J. E., 38, South Dearborn Street, all in Chicago, U.S.A. April 21, 1934, No. 12080. [Class 20 (iv)] An expansion joint for sealing the space between adjacent sections of a concrete road comprises, as shown in Fig. 1, a flexible seal 21 having spaced walls 28, a yieldable filler 22 capping said seal, and means for connecting the joint to the ends of adjacent concrete sections, the seal 21 being adapted to provide means for maintaining an uninterrupted contact between the filler and the concrete sections upon a change of dimension of the space between the concrete sections. The filler 22 which may be moulded from bituminous material, has tapering walls 35 adapted to fit the upper part of the seal 21. The seal 21 is formed from a strip of flexible material, and is provided with laterallyextending and apertured flanges 30 and with longitudinal shoulders 29 to engage the top wall of a supporting box-like stool 20. To secure the seal 21 to the stool 20 a number of keys 32 are passed through openings 33 in the side walls of the stool and have their edges bent to engage the flanges 30. The keys 32 are provided with a plurality of cuts to permit movement of the keys with the concrete. The end of the joint is closed by an end plate 36 and is provided with an adjustable clip 37 extending under the road form 38 as shown in Fig. 9. If the thickness of the concrete adjacent the form 38 is increased, a shoe 39 is anchored to the base of the stool 20. To distribute the load between adjacent sections, each section is provided with a plurality of dowel rods 40 projecting therefrom and engaging freely in sockets 41 anchored in the other section. Each socket may be threaded in a ferrule 42 which is passed through the walls of the stool 20 and the end of the socket remote from that engaging the dowel 40 is bent downwardly to form a support. The dowels 40 are also supported by pins 44 and are interconnected by bars 45 which may be arranged in interlaced pairs. In a modification, the stool 20 is adapted to support a removable mould 48, Fig. 11, for moulding a space for the reception of the seal and filler, the mould being bolted to anchor members 57 which are connected to the stool 20 by tongues bent from the latter. On removal of the mould 48, the seal 49 is positioned with its edges or lateral flanges engaging in the spaces between the concrete sections and shoulders 47 of the anchors 57 and a lead or other filling 50 may be provided as shown in Fig. 12. A bituminous capping 51 is then provided above the seal. The dowel sockets 53, in this case, may merely form caps for the dowels 40 and the uncapped portions of the dowels 52 may be greased to prevent bonding with the concrete. If desired, a seal 21 and filler 22 may be provided at both the top and bottom of the joint, the seals 21 being either directly connected together or with the interposition of a box member 54 as shown in Fig. 16. In a further modification, the stool 20 is replaced by a felt strip 55 as shown in Fig. 19, and a corrugated metal member 56 may be provided on one surface of the strip.