Foundation system for bridges and other structures

1. A precast concrete foundation unit for use in constructing a combination precast and cast-in-place concrete foundation structure, the precast concrete foundation unit comprising:

a first elongated upright wall member and a second elongated upright wall member spaced apart from the first elongated upright wall member to define a channel therebetween, and multiple upright supports located within the channel, each of the multiple upright supports extends laterally between the first elongated upright wall member and the second elongated upright wall member of the first precast concrete foundation unit to (i) define multiple spaced apart cells along a length of the channel and (ii) rigidly connect the first elongated upright wall member and the second elongated upright wall member, each of the multiple cells is open at both the top and the bottom, a receiving channel is located atop each of the multiple upright supports;

wherein bottom surfaces of each of the inner elongated upright wall member, the outer elongated upright wall member and the multiple upright supports of the first precast concrete foundation unit lie in a common plane;

at least some of the multiple upright supports include at least one flow opening extending from cell to cell for permitting cast-in-place concrete to flow from one cell through the upright support to another cell during pouring, wherein the flow opening is spaced above the bottom surface of the support and below a top surface of the support so as to be completely surrounded by precast concrete of the upright support.

2. The precast concrete foundation unit of claim 1 wherein the receiving channel of each of the multiple upright supports extends laterally from within the channel to the first elongated upright wall member.

3. The precast concrete foundation unit of claim 2 wherein the second elongated upright wall member has a height that is greater than a height of the first elongated upright wall member.

4. The precast concrete foundation unit of claim 1 wherein the receiving channel of each of the multiple upright supports is located entirely within the channel.

5. The precast concrete foundation unit of claim 1 wherein each receiving channel is one of (i) a recess formed in the top of its respective upright support or (ii) a channel member mounted to the top of its respective upright support.

6. A combination precast and cast-in-place concrete foundation structure incorporating the precast concrete foundation unit of claim 1 located at a bridge installation site, comprising:

cast-in-place concrete within the channel of the precast concrete foundation unit and tied to each of the first and second elongated upright wall members by reinforcement embedded within both the cast-in-place concrete and the first elongated upright wall member and reinforcement embedded within both the cast-in-place concrete and the second elongated upright wall member, the cast-in-place concrete substantially closes each cell from top to bottom, and cast-in-place concrete is located within flow openings of the upright supports.

7. The structure of claim 6 wherein:

at least some of the multiple upright supports of the precast concrete foundation unit further include multiple reinforcement passages from cell to cell, with reinforcement passing through the reinforcement passages from cell to cell and embedded within the cast-in-place concrete.

8. A method of constructing a combination precast and cast-in-place concrete foundation structure utilizing at least one precast concrete foundation unit according to claim 1 , comprising:

receiving at a construction site a first precast concrete foundation unit according to claim 1 ;

placing the first precast concrete foundation unit at a desired use location of the construction site;

delivering concrete into the cells of the first precast concrete foundation unit while the first precast concrete foundation unit remains at the desired use location;

allowing the concrete to cure-in-place.

9. The method of claim 8 wherein one of a precast concrete pedestal unit or a bridge unit is supported at least in part within the channel on the multiple upright supports prior to delivering concrete into the cells of the first precast concrete foundation unit, and during the step of allowing the concrete to cure-in-place, a bottom portion of the one of the precast concrete pedestal unit or the bridge unit becomes embedded in the cured-in-place concrete.

10. The method of claim 9 wherein each of the multiple upright supports includes a top recess therein or channel member thereon and the one of the precast concrete pedestal unit or the bridge unit is supported by the top recess or channel member.

11. A method of constructing a combination precast and cast-in-place concrete foundation structure, the method comprising:

receiving at a construction site a first precast concrete foundation unit comprising:

a first elongated upright wall member and a second elongated upright wall member spaced apart from the first elongated upright wall member to define a channel therebetween, and multiple upright supports located within the channel, each of the multiple upright supports extends laterally between the first elongated upright wall member and the second elongated upright wall member of the first precast concrete foundation unit to (i) define multiple spaced apart cells along a length of the channel and (ii) rigidly connect the first elongated upright wall member and the second elongated upright wall member, each of the multiple cells is open at both the top and the bottom, a receiving channel is located atop each of the multiple upright supports, at least some of the multiple upright supports include at least one flow opening extending from cell to cell for permitting cast-in-place concrete to flow from one cell through the support to another cell during pouring, wherein the flow opening is spaced from both a top and a bottom of the upright supports;

placing the first precast concrete foundation unit at a desired use location of the construction site;

delivering concrete into the cells of the first precast concrete foundation unit while the first precast concrete foundation unit remains at the desired use location;

allowing the concrete to cure-in-place,

receiving at the construction site a precast concrete wingwall foundation unit;

prior to the delivering step, placing the precast concrete wingwall foundation unit at one end of the first precast concrete foundation unit such that reinforcement extends from the precast concrete wingwall foundation unit and into the channel;

as a result of the delivering and allowing steps, the reinforcement that extends from the precast concrete wingwall foundation unit and into the channel becomes embedded in the cured-in-place concrete.

12. The method of claim 11 wherein the precast concrete wingwall foundation unit includes a bottom surface and a top surface, the bottom surface wider than the top surface.

13. A precast concrete foundation unit for use in constructing a combination precast and cast-in-place concrete foundation structure, the precast concrete foundation unit comprising:

a first elongated upright wall member and a second elongated upright wall member spaced apart from the first elongated upright wall member to define a channel therebetween, and multiple upright supports located within the channel, each of the multiple upright supports extends laterally between the first elongated upright wall member and the second elongated upright wall member to (i) define multiple spaced apart cells along a length of the channel and (ii) rigidly connect the first elongated upright wall member and the second elongated upright wall member, each of the multiple cells is open at both the top and the bottom;

wherein the second elongated upright wall member has a top surface with a height that is greater than a height of a top surface the first elongated upright wall member,

wherein each upright support has a top surface with an uppermost portion and a recessed portion, the uppermost portion vertically adjacent to and extending laterally from the top surface of the second elongated upright wall member, and the recessed portion vertically adjacent to and extending laterally from the top surface of the first elongated upright wall member.

14. A method of constructing a combination precast and cast-in-place concrete foundation structure, the method comprising:

utilizing a first precast concrete foundation unit comprising:

a first elongated upright wall member and a second elongated upright wall member spaced apart from the first elongated upright wall member to define a channel therebetween, and multiple upright supports located within the channel, each of the multiple upright supports extends laterally between the first elongated upright wall member and the second elongated upright wall member of the first precast concrete foundation unit to (i) define multiple spaced apart cells along a length of the channel and (ii) rigidly connect the first elongated upright wall member and the second elongated upright wall member, each of the multiple cells is open at both the top and the bottom, at least some of the multiple upright supports include at least one flow opening extending from cell to cell for permitting cast-in-place concrete to flow from one cell through the support to another cell during pouring;

placing the first precast concrete foundation unit at a use location of a construction site;

delivering concrete into the cells of the first precast concrete foundation unit while the first precast concrete foundation unit remains at the use location;

allowing the concrete to cure-in-place;

prior to the delivering step, placing a precast concrete wingwall foundation unit at one end of the first precast concrete foundation unit, with reinforcement extending from the precast concrete wingwall foundation unit and into the channel;

as a result of the delivering and allowing steps, the reinforcement that extends from the precast concrete wingwall foundation unit and into the channel becomes embedded in the cured-in-place concrete.

15. The method of claim 14 wherein the precast concrete wingwall foundation unit includes a bottom surface and a top surface, the bottom surface wider than the top surface.

16. A method of constructing a combination precast and cast-in-place concrete foundation structure, the method comprising:

utilizing a first precast concrete foundation unit comprising:

a first elongated upright wall member and a second elongated upright wall member spaced apart from the first elongated upright wall member to define a channel therebetween, and multiple upright supports located within the channel, each of the multiple upright supports extends laterally between the first elongated upright wall member and the second elongated upright wall member of the first precast concrete foundation unit to (i) define multiple spaced apart cells along a length of the channel and (ii) rigidly connect the first elongated upright wall member and the second elongated upright wall member, a receiving channel is located atop each of the multiple upright supports, wherein each receiving channel is formed by a recessed portion of the upright support that is downwardly offset from an uppermost surface portion of the upright support;

placing the first precast concrete foundation unit at a use location of a construction site;

supporting one of a precast concrete pedestal unit or a bridge unit at least in part within the receiving channel on the multiple upright supports, wherein a bottom portion of the pedestal unit or bridge unit is located within the recessed portion defining the receiving channel;

delivering concrete into the cells of the first precast concrete foundation unit while the first precast concrete foundation unit remains at the use location and while the bottom portion of the pedestal unit or bridge unit is located within the recessed portion;

allowing the concrete to cure-in-place such that the bottom portion of the pedestal unit or the bridge unit becomes embedded in the cured-in-place concrete.