US1303741A - Beintorced-cohcrete bridge construction - Google Patents

Description

W. M. THOMAS.

REINFORCED CONCRETE BRIDGE CONSTRUCTION. APPLICATION HLEn OCT. 20. I913. RENEWED AUG. 5. 1918.

1,303,741 a Patented May13, 1919.

3 SHEETS-SHEET I- W. M. THOMAS.

REINFORCED CONCRETE BRIDGE CONSIRUGTION APPLICATION man 001.20, 1912. RENEWED AUG. 5. 191a.

Patented May13, 1919.

3 SHEETS-SHEET 3.

m: ,vmems PETERS m. PMam-Lrndm. WASNYNGYON lv UNITE REINFORCED-CONCRETE BRIDGE CONSTRUCTION.

Application filed October 20, 1913, Serial No. 796,180. Renewed August 5, 1918.

To all whom it may concern:

Be it known that I, WHLIAM M. THOMAS, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Reinforced-Concrete Bridge Construction, of which the following is a specification.

This invention relates to reinforced concrete bridges and particularly to the construction of the bridge floor and the supporting means therefor.

One object of the invention is to provide improved means for bracing and reinforcing the floor.

Another object of the invention is to provide improved means for forming the spandrel members whereby the floor is supported from the main arch ribs of the bridge.

Other objects of the invention will appear hereinafter.

The accompanying drawings illustrate embodiments of my invention, and referring thereto:

Figure 1 is a side elevation of a portion of a bridge embodying the invention.

Fig. 2 is a transverse section on line w -:v' in Fig. 1.

Fig. 2*, is a plan of a tightening joint for the reinforcing means.

Fig. 3 is a perspective of the hook members for supporting the horizontal struts of the spandrel members.

Fig. 4 is a perspective of the upper portion of a spandrel post.

Fig. 5 is a perspective view of the upper horizontal member or girder for connecting the upper ends of the spandrel post.

Fig. 6 is a plan view of a portion of the bridge. I I Fig. 7 is a in Fig. 6.

Fig. 8 is a transverse section of a portion of the bridge floor. I

Fig. 9 is ahoriz'ontal section on line w m in Fig. 7, with intermediate portions of the bridge floor broken away. I

Fig. 10 is a vertical section of the bridge floor, showing the floor archesor panels and reinforcements in position before the grouting for bonding the same has been poured into position.

Figs. 11 and 12 show modifications of the means for attachin the cross struts to the arch ribs and span rel posts.-

transverse section on line un -93" Specification of Letters Patent.

Patented May 13, 1919.

Serial 110. 248,460.

Figs. 11 and 12 are perspectives of tie rods shown in Figs. 11 and 12.

Fig. 13 is a transverse section similar to Fig. 2, the cross strut being omitted.

The bridge comprises main arch ribs 1 and having outstanding skew backs at their up per ends, spandrel posts 2 supported thereby, girders 3 supported by said spandrel posts, and a bridge floor supported by said girders. The main arch ribs 1 are preformed and reinforced in any suitable manner and the spandrel posts 2 are also preformed and temporarily mounted upon the'arch ribs and then secured thereto by a molded joint. For each spandrel member formed by the spandrel posts and girder connected to the same, there is also preferably provided a lower horizontal member or strut 5 extending between the main arch ribs and secured thereto and to the spandrel posts. Said strut 5 is preformed of reinforced concrete and is provided with inetallichooks 7 projecting therefrom at each end, said hooks being embedded at one end in the strut 5 and extending upwardly at their outer ends and adapted to engage in loops or eyes 8 molded. into the main arch rib 1, so that the strut 5 may be placed in position withits hook 7 engaging in the eye 8 and will be supported-thereby during the construction. Said strut 5 is further provided with longitudinally'extending reinforcing rods 10 adapted to be con nected to anchor rods 11 projecting from the -main arch ribs 1. Any suitable means may be used for securing these rods together, for example, as shown 1n Fig. 2*, said rodsmay extend in opposite directions through an anchor plate 12, nuts 13 being screwed on said rods on opposite sides of said plate, so that by tightening said nuts, the plate 12 is caused to exert tension on all of said rods, so as to give a tight horizontal connection between the main arch ribs and. the strut 5. The strut 5 is also provided with reinforcing rods 15 extending obliquely upward and connected by a plate 12', and nuts 13' to reinforcing rods 17 extending obliquely downward fromthe spandrel posts-2, the construction for the parts 12; and 13' being the same as above described for parts 12and 13-, see :Fig. 2*. Each spandrel post 2 is provided at its lower end with a recess 18 at each side, the reinforcing rod 17 aforesaid, extendin down through said recess and vertical rein orcing rods 20 extending down through the outer recess 18 and being connected by plates l2" and nuts 13 similar to plate 12 and nuts 13 above described, to reinforcing rods 21 projecting upward from the main arch rib.

When the main arch ribs 1, strut 5, and spandrel posts 2 have been connected by the reinforcing members 10, 11, 15, 17, 20, and 21, as above described, and thereby rigidly secured in position, mold boards are placed in position so as to inclose the recesses 18 and the space 24 between the strut 5 and the adjacent faces of the main arch rib and spandrel post, and the cement or grouting is run or filled into such recesses 18 and space 24 to form concrete cement bonds 22 and 23 between the preformed members 1, 2, and 5, uniting the same into a unitary monolithic structure.

The spandrel posts 2 are provided at their upper ends with rabbets forming vertical faces 26 and horizontal bearing faces or shoulders 27 and the girders 3 are provided at their ends with hearing faces 23 adapted to rest on said shoulders. Metal rods 28 extending obliquely upward from said shoulders are adapted to extend into recesses or sockets 29 in said girders when the latter are in position and the said girders arepro'vided with downwardly extending metal rods or pins 29 adapted to engage in recesses 30 in i the spandrel posts extendingobliquely downward from said shoulders 27 The ends 'of the girders 3 are provided with recesses 32 in their upper faces through which extend horizontal reinforcing rods 33. Horizontal rods 34 extend from the upper part of each spandrel post and are connected to said horizontal rods 33 of the girders by plates 12 and nuts l3 similar to plate 12 and nuts 13 above described. The girders are so proportion'ed that when in position on the shoulders 27 a space '36 will be left between the end of each girder and the vertical face 26 of the spandrel post and suitable mold boards being put in position, these spaces 36 and the recesses 29 aforesaid are filled with grouting or cement, so as to bond the girders onto the spandrel posts to form a unitary monolithic structure therewith. v

The bridge floor is composed of a plurality of preformed floor blocks 'or members 40 resting on the girders '3 and concrete "or cement uniting 'sai'd floor members to one another and tofthe girders. Each of these members 40 is formed as a cantaliver, and they are placed on the girders in such position as to form arches and to leave spaces or channels 42 between their upper ends, ex tending longitudinally of the bridge, and

said members 40 are spaced apart longitudr nally so as to form channels '43 extending transversely of the bridge. Longitudinal reinforcing bars 44'extend in said longitudinal channels 42 and transverse reinforcing bars'45 extend in said transverse channels 43..

Reinforcing members 46 embedded in the girders 3 extend upwardly into the longitudinal channels 42 and are bent around the reinforcing rods 44. When the parts are in position, as above described, cement or grouting is run into the longitudinal and transverse channels 42 and 43 aforesaid, and fills the said channels as well as the spaces 43 between the members 40 directly over the girders, the cement being continued or built up on top of the members 40 to! any desired height to form the floor. It will be understood that in the spaces between the girders the bottoms of the longitudinal channels 42 are closed by mold boards so that the cement at these parts only fills said channels so as to form with the members 40 complete arches supported on the girders.

Each of the floor members 40 is provided with reinforcing rods 50 in its lower or central portion extei'i'ding longitudinally of the bridge, these rods projecting into-and being embedded in the concrete poured into the transverse channels 43. The outside fi'oor member 40 at each side of the bridge is also provided with reinforcing rods 50 at its lower portion, extending longitudinally of the bridge, and embedded in the cement between the panels. At the outer side of each of these outside panels are provided Tipper reinforcing rods 51 and lower reinforcing rods 52, extending longitudinally of the bridge, and tied to the floor body by lower tie rods 53, and stirrup means 54. Tie rods 53 are connected by plates 55 and nuts 56, similar to the plates 12 and nuts 13 above described, to rods 57, which are embedded in floor membeis 40. Stirrup means 54 are embedded in the floor member or blocks 40 and are preferably formed by bending a rod in 21g zag shape, said rod being looped at its outer ends over the longitudinal rods 51 and 52 and the bends or loops of the rod being lower rods, 51 and 52, as shown, or it niav be bent over only one of the rods so as to lie in one plane. The floor members 40 adjacent these outside members 40 are provided with metallic anchor rods 62 embedded therein and projecting therefrom and turned down as shown at '63 to extend through the loops or bights 58 of the reinforcing rods or stirrups 54. These metallic comiections 58, 63 are embedded in the cement filling the longitudinal passages 42. Outside facings 59 of concrete cover and embed the longitudinal rods '51 and 52.

As shown in Fig. 11, the main arch rib 1' may be provided with metal tie rods 65, looped around vertical reinforcing 21 in the main arch rib and embedded in said rib, said rods extending obliquely downward from the main arch ribs and into recess 67 in struts 5 and being bent laterally at their lower ends, as shown at 65', so that when the cementitious bond 68 is molded in position it embeds the bent portion 65 and connects the same to the strut.

The strut may be provided with tie rods 70 as shown in Fig. 12, extending obliquely upward and over the arch rib, and bent around the vertical reinforcing rods 21 above the arch ribs, these tie rods being embedded in the cement bond 22, filling the outside recess 18 of the spandrel post.

In some cases the transverse struts for the spandrel members may be omitted. Thus as shown in Fig. 13, arch ribs, spandrel posts, and girders may be constructed and connected as above described without the use of a transverse strut.

What I claim is:

1. In combination, main arch ribs provided with upwardly extending and transversely extending reinforcing rods, spandrel posts having their lower ends resting on the main arch ribs and recessed at their inner and outer faces adjacent the upper faces of the main arch ribs, reinforcing rods in the posts connected in the outer recesses to the upwardly extending rods of the main arch ribs, other reinforcing rods in the posts extending obliquely downwardly and inwardly from the inner recesses, a strut extending transversely between the main arch ribs and having its ends spaced apart from, the side faces of said ribs, reinforcing rods in the strut projecting from the ends thereof and connected in the spaces to the transversely extending rods of the posts, other reinforcing rods in the strut projecting obliquelyupward and outward from the ends thereof and connected in the spaces to the down wardly and inwardly projecting ends of the rods of the posts, and cement bonds filling in the recesses and filling in the spaces between the ribs and ends of the strut.

2. In combination, main arch ribs provided with upwardly extending and transversely extending reinforcing rods, the transversely extending rods having loops,

spandrel posts having their lower ends resting on the main arch ribs and recessed at their inner and outer faces adjacent the upper faces of the main arch ribs, reinforcing rods in the posts connected in the outer recesses to the upwardly extending rods of the main arch ribs, other reinforcing rods in the posts extending obliquely downwardly and inwardly from the inner recesses, a strut extending transversely between the main arch ribs and having its ends spaced apart from the side faces of said ribs, reinforcing rods in the strut projecting from the ends thereof and connected in the spaces by hooks to the loops of the transversely extending rods of the posts, other reinforcing rods in the strut projecting obliquely upward and outward from the ends thereof and connected in the spaces to the downwardly and inwardly projecting ends of the rods of the posts, and cement bonds filling in the recesses and filling in the spaces between the ribs and ends of the strut.

3. In combination, spandrel posts having shoulders and having outstanding skewbacks at their upper ends, there being recesses in the shoulders, a girder extending transversely between the skewbacks and resting on the shoulders and having its ends spaced apart from the inner faces of the skewbacks, the ends of the girder being provided with recesses in its upper and lower faces, reinforcing rods extending upward from the shoulders into the lower recesses, reinforcing rods extending transversely from the inner faces of the skewbacks, reinforcing rods in the girder extending through the upper recesses thereof and connected in said recesses to the transversely extending rods of the skewbacks, other reinforcing rods in the girder projecting obliquely downward and outward and seated in the recesses of the shoulders, and cement bonds filling in the recesses and filling in the spaces between the skewbacks and ends of the girder.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 9th day of'October, 1913.

WILLIAM M. THOMAS.

In presence of ARTHUR P. KNIGHT, LORRAINE E. Dmmow.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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