Патент USA US2118330код для вставки
2,118,330 Patented' May 24, 1938 UNITED STATES PATENT OFFICE 2,118,350 GltA'l‘IlilG’r- EXPANSION JOINT FOB BRIDGES Ernest L. Tarot, Brooklyn, N. Y., assigner to Ker low Steel Flooring Co., Jersey City, N. J., a cor poration of New Jersey Application February 17, 1937, Serial No. 126,102 10 Claims. (Cl. 14-16) This invention relates to grating expansion gether for expansion or contractile movement joints for bridges and the like and has for its object to eliminate disadvantages inherent in many of the previously used types of such joints. 5 Another object is to provide such an expansion joint which is especially adapted for use with the type of metal gratings which we manufacture. One common form of expansion joint on the highway portion of bridges has been a butt type joint which is practically vclosed in hot summer weather but wide open in cold weather. In many places the distance or sizeof gap which is open in such types of expansion joint in cold weather may be as much as about three inches, which is too large a 'gap for trame to pass over smoothly, with the result that heavy trucks cause substan tial impacts which needlessly impair the joint. Another type of expansion joint in use has in „ volved oppositely extending tapered fingers which overlap longitudinally various amounts accord ing to the temperature or season. An objec tion to this type of expansion joint is that ice forms on `the vsides of the overlapping lingers due to their being laterally spaced only a small amount, perhaps about a quarter of an inch. 25 This formation of ice is sufliciently serious to impede the functioning of the expansion joint 3 35 and it has been necessary tohave workmen with blow torches go around and melt the ice thus formed. Under this invention the tendency of ice to form at the expansion joint isjsubstan tìally minimized. Referring to the drawing, Fig. 1 is a top plan view of one embodiment of this invention. Fig. 2 is a section on the line 2-2 of Fig. l. Fig. 3 is a section on the same line of Fig. l, but with the grating sections Widely spaced, as in very cold weather. ' Fig. 4 illustrates a modiñed type of expansion 40 joint. , Fig. 5 shows a further type of expansion joint adapted for use with grating sections. Fig. 6 is a lift or bascule type bridge for which the expansion joint of Fig. 5 is particularly 45 adapted when used with my open grating door. A grating section I0 on a bridge or the like is movable with respect to the end of an adja cent grating section II, so that these adjacent end portions are quite close together in very hot 50 weather but contract and form a space, I2, be tween them which may vary up to possibly three inches in the very coldest weather. Each grat ing section, I0 and II, may be of any convenient length and may include several or> any desired 55 number of such lengths which are fastened to as a unit. Preferably each such section is an chored to one of its transverse supporting beams adjacent its central portion in order that the ex-pansive movement of each section may be on both sides of such anchorage. Ordinary beams I3 and Il, extend transversely across the bridge for supporting these grating sections we manu- n facture. Each grating section is preferably com prised of straight bars, I5, and spacing bars, I6, 10 which are riveted or welded to the straight bars. Any convenient type of spacing bar may be used such as that illustrated or the substantially nor mal type bar. vA splicing section, I1, is provided to support the adjacent end portions of the grat 15 ings, Ill and II, and also for the purpose of pro viding a ñller or bridge when the gap, I2, is large, in order that vehicular trailic may -travel over the open gap with ‘a minimum amount of vibra tion. ‘ This splicing section includes a number 20 of longitudinal members arranged contiguous alternate longitudinal members of the grating sections, or, if desired, they may be arranged contiguous each longitudinal member of the grat ing sections I0 and II. As illustrated in Fig. 1, this splicing section has its longitudinal por tions arranged contiguous alternate longitudinal grating members and connected tothe longitudi nal straight bars by headed securing means, I8, passing through elongated slots, I9, located be 30 low the spacing bars in order that limited rela tive movement may take place between the splic ing section and each grating section. The longitudinal portions of the splicing sec tion Il are preferably supported on the trans 35 verse beams, I3 and I4, as illustrated and so shaped as to ñt between these beams and con tiguous their sides so that the splicing section longitudinal portions are substantially fixed while the adjacent ends of the grating sections, 40 I0 and I I, are movable with respect thereto with temperature change. ` 'I'he longitudinal portions of the splicing section may be connected by spac ing portions below the longitudinal straight bars of the grating sections, I0 and Il, as suggested in my Patent 2,014,912, dated September I7-, 1935. 0r, if desired, the various longitudinal bars of 45 the splicing section I1 may be disconnected ex cept as they are connected through the grating sections. The top of the splicing sections prefer 50 ably is contiguous the under side of the spacing bar, I B, to assist in supporting the overhang ing ends of the grating sections. In the em bodiment illustrated, the headed securing means, I8, which may be either a bolt or a rivet, is ?xed 55 2 2,118,830 with respect to the portion of the straight bars, l5, through which it passes beneath the spacing bar, I6, while the slots, i9, are shown as being provided in the splicing section. The central portion of the splicing section is raised as shown at 2|, to a height substantially ilush with the top of the grating sections, i0 be understood that if desired this splicing section may be fastened with respect to either’grating section and movable with respect to the other. The splicing section of this invention may serve the combined oillce of both a splicing section to support the ends of adjacent gratings and also as a bridging part oi’ an expansion joint. There is little or no tendency for ice to form between and Il, so that when the grating sections are widely spaced apart, this raised portion, 2 I, serves longitudinal portions of the expansion joint,` either in Fig. 5 or in Figs. 1 to 4. It the adjacent 10 ends of the grating sections are oi' the type illus trated in Fig. 5, these sections may have their as a bridging element to facilitate smooth travel of vehicular trañic over the joint in cold weather without objectionable impact. As shown in Fig. 1, this raised or bridging portion. 2i, lies con tiguous alternate straight bars, I5. If it is de« straight bars in substantial alignment when the raised portion of a splicing section may be placed contiguous each straight bar, or it desired, a. 15 sired for the splicing section longitudinal mem bers to be contiguous each of the longitudinal splicing section between adjacent straight bars straight bars, l5,l thenvthe raised portion, 2|, in as in Fig. 4 may be used with the grating ends of the type shown in Fig. 5. In event an un alternate straight bars must be considerably shorter than that shown» in Figs. 1 to 3, or else 20 the bent spacing bar, I6, will have to be termi nated at alternate straight bars, I5, back from the ends of alternate straight bars of each sec tion rather than allowed to extend to the ends of alternate straight bars as illustrated in Fig. 1. In Fig. 4, the'long'itudinal portions, I'la, of the splicing section are arranged between rather than on the same side of the straight bars, lia, usually hot day may expand the grating sections shown `in Fig. 5 until the ends of the bars, 23, 20 abut the spacing bars, lib, that should not be objectionablev for it shouldbe a relatively simple matter for either the ends, 23, or the bent bars, I6b, to be bent by expansion and contract as may be necessary. From Fig. 5, it may be seen that if the ilngers, 23, have their ends abutting the bent bar, llîb, the .tendency of any of the bars of each grating section. .This arrangement has to be bent is balanced due to the symmetrical the advantage of enabling the longitudinal ~ arrangement of the spacing bars, lib. straight bars of. each grating section to overlap I claim: each other longitudinally, if desired. In each 1. A grating expansion joint between sections embodiment the bent bars must be shaped to for a bridge and over which vehicular trañlc is allow the necessary relative movement between adapted to pass, comprising longitudinal mem the splicing section straight bars and the grating bers adapted to move toward and from each other 35 sections. Here again the longitudinal portion of as portions of. said bridge expand and contract, - the splicing sections may be laterally connected a longitudinal member overlapping portions of or not, as desired, below the straight bars of the said first mentioned longitudinal members, hav grating sections. ing an extension substantially ñush with the top In Fig. 5 is shown another form of expansion of said sections, adapted to -bridge any gap 40 joint adapted for use with grating sections. between them and to assist in directly support This type of joint will be seen to comprise over lapping straight bar extensions, 23, which are formed beyond the termination of the bent bars, I6b, and the straight bars, l5b, are shown as 45 being laterally spaced about midway between pairs of the straight bars of the other grating section. An expansion joint of this type is preferably used without the splicing section de scribed in connection with Figs. 1 to 4, inclusive. 50 Since the spacing between straight bars oi'. a Y55 grating section is generally inV excess of two inches, the lateral spacing between the over lapping ñngers, 23. is generally in excess of an inch, with the result that any tendency for ice to form on the sides of the overlapping bars, 23, is greatly minimized. The expansion joint shown in Fig. 5 is especially adapted for- use with lift or bascule type bridges the adjacent end portions oi which may be slightly overlapped. ,Such a bridge 60 is illustrated in outline in Fig. 6, where the bas’ cules 2li are pivoted at 25, as is customary. Among the advantages of this invention may be mentioned the elimination of any exposed sur faces adjacent the expansion joint on which sub 65 stantial quantities of snow or ice may collect. The relatively narrow edge surfaces provided in gratings allow for very little snow or ice to col lect. The provision of a raised or bridging part to the splicing section permits vehicular traffic 70 to travel over a wide gap in cold weather with little or no impact comparable to what might occur if the raised or bridging portions were ab sent. While the splicing section has been illus trated as being anchored and movable with re 75 spect to each grating section, nevertheless, it will ing vehicular trafllc as it. passœ over such gap, said second mentioned longitudinal member be ing slidably secured to the ñrst mentioned longi tudinal members so that it need not move with them. ., 2. A grating expansion joint between sections for a bridge and over which vehicularv trame is adapted topassI comprising longitudinal mem bers adapted to move toward and from each other as portions of said bridge expand and contract, a longitudinal member overlapping portions of said 50 first mentioned longitudinal members, having an extension substantially flush with the top of said sections, adapted to bridge any gap between them and to assist in directly supporting vehicular trailìc- as it passes over such gap, said second 55 mentioned longitudinal member being slidably secured to at least one of the iirst mentioned longitudinal members so that it need not move with them, and means for holding said second 60 mentioned longitudinal member against move ment with at least one of said ñrst mentioned longitudinal members. ’ 3. In a bridge or the like paved with metal grating sections adapted to be moved toward and 65 from each other longitudinally with expansion and contraction of said sections, each section in cluding longitudinal substantially straight bars having 'spacing bars secured between them and of less depth than the straight bars, a splicing 70 section having longitudinal members secured to at least some of. the longitudinal members of said sections by headed securing means fastened to the longitudinal Amember of one section and pass ing through a longitudinal elongated slot in the ß v 2,118,380 contiguous longitudinal member, said spliced sec-~ tion having an elevated portion centrally thereof rising to a height such that its top is substantially flush with the tops of said grating sections. 4. In a bridge or the like paved with metal grating sections adapted to be moved toward and from each other longitudinally with expansion and contraction of said sections, each section in cluding longitudinal substantially straight bars 10 having spacingV bars secured between them and of less depth than the straight bars, the straight bars of one section being laterally displaced from the straight bars in the other grating section, an expansion joint being formed between said sec15 tions so that a longitudinally extending portion of one section substantially overlaps another lon gitudinally extending portion of theother sec tion to prevent the formation of an open gap lon gitudinally between the sections at the top or 20 tread surface of said paving, said joint including a splice section secured to the longitudinal straight bars of each section below their spacing bars and having an extension substantially flush with the top of said sections at their ends. 25 5. In a bridge or the like, an expansion joint formed between metal grating sections which are adapted to be moved toward and from each other 30 longitudinally with expansion and contraction of said sections, each section including longitudinal substantially straight bars having spacing bars secured between them and of less depth than the straight bars, spaced transverse beams on which said sections are supported, a splicing section overlapping the adjacent end portions of said sec 35 tions in said joint, and being supported at its ends on adjacent portions of said sections, a slid able connection between said splicing section and the adjacent end portions of said grating sections, said splicing section being anchored to at least 40 one of said transverse beams. 6. In a bridge or the like, an expansion joint formed between metal grating sections, which are adapted to be moved toward and from each other longitudinally with expansion and contraction of said sections, each section including longitudinal substantially straight bars having spacing bars secured between them, spaced transverse beams 3 gitudinal bars in said grating sections. the longi tudinal bars of the splicing section having an ex tension which is substantially flush with the tops of said grating sections. 7. An expansion joint between metal grating sections comprising a splicing portion attached to at least one of said grating sections, having a part which is substantially flush with the tops of said gratingsections and which is adapted to longitudinally overlap the ends of said grating 10 sections. 8. The combination with a pair of metalgrat ing sections adapted to have a space between their adjacent ends, of longitudinal members overlapping said sections, forming anexpansion» joint and provided with raised portions substan tially ilush with the tops of said grating sections at their ends, and supports for said grating sec tions and longitudinal members. 9. A grating expansion joint for a bridge and 20 over which vehicular trailic is adapted to pass, comprising longitudinal members adapted to move toward and from each other as portions of said bridge expand and contract, a longitudinal member overlapping portionsl of said iirst men any gap between them and to assist in directly supporting vehicular tramo as it passes over such gap, said second mentioned longitudinal mem ber being slidable relatively to at least one oi' the 30 iirst mentioned longitudinal members, said sec ond mentioned longitudinal member having its end portions provided with supporting means which is in addition to any connection to either 35 of the ilrst mentioned longitudinal members. l0. A grating expansion joint for a bridge over which vehicular trafilc is adapted to pass, com prising grating sections which are adapted to be moved relatively toward and from each other longitudinally with expansion and contraction oi’ 40 said sections, each section including longitudinal substantially straight bars having bent spacing bars secured between them and of less depth than the straight bars, splicing bars secured to at least some of the straight bars of said sections 45 below the spacing bars and provided with raised portions substantially ñush with the tops of said on which sections are supported, a splicing sec-v sections and bridging any gap between the ends tion overlapping the adjacent end portions of of no more than alternate ones of said straight 50 said sections and including longitudinal bars slidably secured to longitudinal bars of each grat ing section, said splicing section being located contiguous and on opposite sides of adjacent lon 25 tioned longitudinal members, adapted to bridge bars when the spacing bars extend substantially 50 to the adjacent ends of said grating sections. ERNEST L. TAROF.