摘要:
A precast roadway slab is pre-tensioned longitudinally and transversely, and may also be post-tensioned. A casting bed has the capability of permitting pre-tensioning of a concrete cast to be carried out within the casting bed in both the longitudinal direction and in the transverse direction. Slots are provided at regular intervals within the side walls and jacking heads of the casting bed for tensioning wires to pass therethrough for pre-tensioning. The process utilizes a multilayer grid of pre-tensioning wires disposed within the casting bed, prior to pouring of the concrete. The cast concrete product can also be made with optional tubular ducts, laid parallel to the longitudinal wires, for post-tensioning subsequent to the cast of the concrete. The post-tensioning of the hardened cast, if called for, takes place at the job site.
摘要:
A method of constructing a paved surface such as a roadway in which piles (8) are placed in the ground (G) and preformed slabs (4) are laid over the piles (8) to form a continuous paved surface. The preformed slabs (4) may be short in length and may be supported at opposite ends by separate beams (6) which comprise the pile caps. In a preferred embodiment, suitable for the construction of an elevated roadway, the method further comprises the steps of supporting preformed structural elements 5, 15 on the piles 8 and supporting the preformed slabs 4 on the preformed structural element 5, 15. The preformed structural elements 5, 15 may be shaped so as to provide an open work structure. Preferably, the preformed structural elements 5, 15 comprise substantially V-shaped channels which are laid with their longitudinal axes at right angles to the longitudinal centrelines of the roadway 2, and with their flanges 14 directed downwards. A plurality of rows of preformed structural elements 5, 15 may be stacked one above the other to achieve the desired elevation of the roadway 2. In addition, the size of successive preformed structural elements 5a, 5b, 15a, 15b may be gradually varied to provide the finished roadway 2 with the desired gradient.
摘要:
An end support for a prefabricated highway section of a prefabricated highway system. The end support includes a first elongated support member for transverse engagement of a longitudinal end of the prefabricated highway section, the first elongated support member having an elongated length dimension at least three times either of two transverse height and width dimensions and a second elongated support member parallel to the first support member and laterally aligned with the first member along an orthogonal axis for abutting an earth support of the prefabricated highway system along a longitudinal length of the second support member, the second elongated support member having an elongated length dimension at least three times either of two transverse height and width dimensions. The support member also includes a connecting member joining a center portion of the first and second elongated members in a rigid spaced-apart relationship.
摘要:
A prefabricated highway with end supports. The end supports include a first elongated support member for transverse engagement of a longitudinal end of the prefabricated highway section and a second elongated support member parallel to the first support member and aligned with the first member along an orthogonal axis for abutting an earth support of the prefabricated highway. The end supports further include a connecting member joining the first and second elongated members in a rigid spaced-apart relationship.The support structure is used as part of a prefabricated highway system. The prefabricated highway system uses the support structures for support of individual lane sections. The prefabricated lane sections are fabricated out of prestressed concrete and are designed to be supported longitudinally in a direction of traffic flow at each end by an upper surface of the first elongated support member of each support section. Lateral movement of the lane sections are prevented by a rib disposed in a bottom of each lane section and a complementary notch in top of each support structure. Lateral movement of each support structure is prevented by bolting together opposing ends of the first and second elongated support members of adjacent support structures of adjacent traffic lanes.The prefabricated lane sections are delivered to a construction site with lane markers and lane dividers already installed. Sensors are preinstalled in each lane section for purposes of monitoring traffic activity and the structural integrity of the lane section and supporting support structures. Wear sensors and weather condition sensors are also provided within the lane sections. Conduit is provided within each lane section to route sensor wiring to a local department of transportation office.
摘要:
A prefabricated roadway system consisting of interconnected roadway slabs constructed from (ferro-cement) reinforced concrete and including a service module or console for location along the sides of the roadway. The module includes a built-in drain gutter which is connected to a sewer pipe going through the modules as well as provision for TV, telephone, and electrical cables, pneumatic mail chutes, water, gas, oil, steam and the like.
摘要:
A precast roadway slab is pre-tensioned longitudinally and transversely, and may also be post-tensioned. A casting bed has the capability of permitting pre-tensioning of a concrete cast to be carried out within the casting bed in both the longitudinal direction and in the transverse direction. Slots are provided at regular intervals within the side walls and jacking heads of the casting bed for tensioning wires to pass therethrough for pre-tensioning. The process utilizes a multilayer grid of pre-tensioning wires disposed within the casting bed, prior to pouring of the concrete. The cast concrete product can also be made with optional tubular ducts, laid parallel to the longitudinal wires, for post-tensioning subsequent to the cast of the concrete. The post-tensioning of the hardened cast, if called for, takes place at the job site.
摘要:
A precast roadway slab is pre-tensioned longitudinally and transversely, and may also be post-tensioned. A casting bed has the capability of permitting pre-tensioning of a concrete cast to be carried out within the casting bed in both the longitudinal direction and in the transverse direction. Slots are provided at regular intervals within the side walls and jacking heads of the casting bed for tensioning wires to pass therethrough for pre-tensioning. The process utilizes a multilayer grid of pre-tensioning wires disposed within the casting bed, prior to pouring of the concrete. The cast concrete product can also be made with optional tubular ducts, laid parallel to the longitudinal wires, for post-tensioning subsequent to the cast of the concrete. The post-tensioning of the hardened cast, if called for, takes place at the job site.
摘要:
A precast roadway slab is pre-tensioned longitudinally and transversely, and may also be post-tensioned. A casting bed has the capability of permitting pre-tensioning of a concrete cast to be carried out within the casting bed in both the longitudinal direction and in the transverse direction. Slots are provided at regular intervals within the side walls and jacking heads of the casting bed for tensioning wires to pass therethrough for pre-tensioning. The process utilizes a multilayer grid of pre-tensioning wires disposed within the casting bed, prior to pouring of the concrete. The cast concrete product can also be made with optional tubular ducts, laid parallel to the longitudinal wires, for post-tensioning subsequent to the cast of the concrete. The post-tensioning of the hardened cast, if called for, takes place at the job site.