US1060920A - Concrete bridge. - Google Patents

Description

D. BE LUTBN. CONCRETE BRIDGE. APPLICATION PILPb MAR. 29, 1909.

1,060,920. Patented May 6, '1913.

@yt/venice witness@ I Daniel B. Luie UNITEDl sTATEs PATENT oEEIoE.

i DANIEI. B. LUTEN, or INDIANAroLIs, INDIANA.

CONCRETE BRIDGE.

Original application led November 1,

To all whom t may concern:

Be it known that I, DANIEL B. LUTEN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new` and useful Improvements in Concrete Bridges, of which the following is a specication.

The obj ect of my invention is to produce a concrete structure under such conditions that the'loads thereof will be properly sustained and, if there be any cracking it will be along predetermined lines which will neither reduce the strength of the structure nor affect its appearance; to construct an arch structure in successive rings which will be subjected to the stresses of their own weight at different periods in order that the settling and load stresses in one section o`f arch ring may be caused' to counteract similar stresses in the adjacent arch ring or spandrel; and to provide such ,improvements in details and methods of construction as shall hereinafter be pointed out.

This application isa division of an appli-- cation filed by me Nov. 1", 1906, Serial No. 341,605. Y

The accompanying drawings illustrate my invention.

Figure 1 is a longitudinal vertical section of an arch supported upon its centering. Fig. 2, is a transverse section of an arch showing the preferred manner of constructing the same'in longitudinal rings.

The abutment or piers 21 are built to about the springing lines s and centering is erected for one of the'arches at the middle of the axis thereof, the centerinv-being Wide enough to support a ring of reasonable width. The concrete is laid upon this centering and, in order that the load of the concrete may be uniformly applied I prefer to place the concrete simultaneously at the crown and the haunches, depositing concrete in opposite directions from these points until the entire ring is produced from skewback S to skewback S', thus forming a ring R. By depositing the concrete in this way the arch is loaded at the crown and haunches simultaneously and there is but slight tendency for the ring to become distorted. After a ring has been produced the-centering will be struck, the arch ring thereupon assuming the stresses of its own load generally by sinking slightly at the crown and corre- Specicaton of Letters Patent.

1906, Serial No. 341,605. Divided and this applic 29.1909. Serial No. 486,643. v

Patented May e; 1913.

spondingly rising at the haunches. Two sets of centering may then be arranged at opposite ends of the completed arch ring (see Fig. 2) and additional arch rings It R are then produced in the same manner, allowed to set, and the centering then withd rawn, the operation being repeated as many tlmes as may be necessary to complete the span. l

The arches are completed in succession from skewback to skewback in the manner already described, the spandrel walls and the spandrel posts being left until the last. The adjacent sections having taken their settlement the spandrels will not settle materially and the usual cracks which occur in the spandrels near the haunches do not appear. After the end rings of the arches are completed the centering maybe eased off before the spandrels are completed. A saving in centering may thus be eifected by the repeated use of the centering in the same span.

I claim as my invention:

1. That improvement in the art of building a concrete arch, comprising erecting on supports an intermediate longitudinal section, permitting it to harden, then lowering the supports under that section, and subsequently constructing longitudinal sections contiguous to said intermediate section and on opposite sides' thereof.

2. That improvement in the art of building an arch, comprising erecting on supports an intermediate longitudinal section, per mittiiig it to harden, then lowering the supports under that sect-ion, and subsequently constructing longitudinal sections and bonding them to the first sect-ions contiguous t0 saidintermediate section and on opposite sides thereof.

3. That improvement in the art of erecting concrete arches, which consists in separately erecting upon supports three contiguous arch rings in two set-s, one set comprising two rings and the other set comprising one ring, one of the sets being allowed to harden and its supports being removed before the erection of the other set, thereby balancing the eect of one set in its hardened condition against the effect of the other set.

4. That improvement in the art of building a concrete arch, comprising erecting on false-work supports an intermediate longitudinal section between proposed end sections, permitting it to harden, then lowering the false-Work supports under tht section, and subsequently constructing 0n false-Work supports the proposed end sections and bonding them tothe intermediate section;

5. Thatmprovelnent in the art of building an arch, comprising erecting on false- Work supports an mtermedate' longitudinal section between proposed end sections, then loweringthefalse-Work Supports under that section, subsequently constructing 0n falsen work supports'the' proposed end sections and this fifteenth day of ll/Iztrch,l A.l D.

bonding them to the intermediate section, and ereetmg superstructures on sind end sections.

my hand and seal at Indianapolis, Indiana, one thou Copieslof this ptent may be obtained for ve cents ealch, `by adressing the Commissionerof Plate-ntl, WashingtonLD. C. f

In Witness whereof, I have hereunto set 15

Images