摘要:
The present invention relates to prestressed composite truss girder and construction method of the same. The prestressed composite truss girder of the present invention comprises a concrete bottom plate having structure of composite truss; a lower-chord member being composed of prestressed concrete wherein prestress is induced to resist against the elongation strength generated when composing and not composing and to reduce the droop occurred at the state of composition and having perpendicular and horizontal cross-section of certain shape and certain length; web members wherein vertical chords and diagnal chords composed of rolled steel to upper plate of said lower-chord member; and upper-chord member combined with said web members along the longitudinal direction of said lower-chord member to resist against the compressive force generated before said concrete bottom plate being composed.
摘要:
An improved structural reinforcement bar for use in poured concrete construction has an anchorage plate fixed to a rebar body through friction welding. The friction welded rebar body and anchorage plate result in a structural reinforcement bar with improved axially oriented tensile load transfer capabilities having minimal space requirements.
摘要:
A pre-cast concrete form for cast-in-place beams and columns and a method of forming the same. The form includes a form body having a channel through a length thereof and a shear bonding key along the length, the channel being adapted to receive cast-in-place concrete therein to form a beam or column. The shear bonding key is integrally formed in the body and has a grooved portion and a ribbed portion for bonding the cast-in-place concrete to the form body. The form body may further include a reinforcing stirrup tie cast therein and extending into the channel, adapted to secure the form body to an opposed form body. The form body may include a plurality of shear bonding keys and reinforcing stirrup ties spaced apart along the length thereof. The method includes the steps of positioning a pre-cast concrete form having a channel extending therethrough, pouring the cast-in-place concrete into the channel of the form, and bonding the concrete to the form with a shear bonding key integrally formed along the channel of the form. This method may further include the step of securing opposed forms together with a reinforcing stirrup tie extending from the forms into the cast-in-place concrete.
摘要:
The present invention provides a composite action system and a method for fabricating the same to meet OSHA safety requirements and allow for welding off the work site. An improved structural system achieves the desired composite behavior by providing one or more structural members, plates coupled with the structural members, transverse reinforcing members passing through apertures in the plates, and additional reinforcing members positioned parallel and transverse to the structural members to provide an interlocking composite action between the structural members, reinforcing members, and concrete.
摘要:
A novel concrete composite non-meshed wall finishing system over key lock grid substrate (9) comprising of at least one foam-type building panel (10), and at least on one side of said panel a multi-number of a vertical keyed locking groove (11), a multi-number of a horizontal keyed locking groove (12) placed approximately at a 90 degree angle to said vertical keyed locking groove (11) forming a keyed locking grid substrate (13), which allows a fiber-reinforced acrylic-modified cementaceous base coat (14) to fill in and cover said keyed locking grid substrate (13) thereby giving sufficient strength to said fiber-reinforced acrylic-modified cementaceous base coat (14) to support a synthetic or non-synthetic colored finish (15) as a final exterior finish.
摘要:
The present invention concerns a framing system for a composite concrete floor, the framing system comprising horizontally extending primary framing members supporting secondary framing members across the primary framing members. Each of the secondary framing members has two opposite ends provided with a shear shoe fixed to the primary framing members by means of a structural joint sufficient to provide a shear connection between the concrete floor and the primary framing members. Thanks to these shear shoes, the framing system of the invention has an increased resistance to horizontal shear forces as compared to prior art concrete floor systems.
摘要:
An expandable safety guard for a scissor lift is disclosed. The safety guard has a plurality of pivoting plates or blades which expand to create a barrier preventing insertion of objects and body parts between the arms of the scissor lift. A method of preventing pinching at the joints connecting arms of a scissor lift is also disclosed.
摘要:
A composite roof form includes first, second and third upright building walls laterally connected to define an interior building space, wall upper end segments of the at least a first upright building wall, a second upright building wall and a third upright building wall; the interior building space containing a building floor; a beam having an inward beam an beam upper segment and having a recessed horizontal lip portion along the bottom of the beam upper segment facing and substantially parallel with an opposing the wall, the beam upper segment defining a fourth roof form side wall; and a roof form support structure comprising at least one support leg extending from the building floor upwardly along the opposing wall to substantially the bottom of opposing second wall upper end segment and including a support panel having a panel connected end joined to the support leg and a panel engaging end with a panel upper surface and with a lip portion engaging structure resting on and supported by the lip portion, so that the panel upper surface extends along the bottom of the wall upper end segments so that the panel upper surface defines at least a portion of a roof form bottom wall.
摘要:
A wall system employing channel-reinforced lightweight precast concrete wall panels. The precast wall panels include a concrete slab, a pair of spaced-apart elongated generally parallel metallic side channels, and a plurality of spaced-apart elongated generally parallel metallic attachment channels. The side channels and attachment channels are partially embedded in the slab and extend substantially perpendicular to one another. Each wall panel can be coupled to a support wall by extending self-tapping screws through metallic wall framing members and the attachment channels at locations where the framing members and attachment channels cross.
摘要:
A building structural element (1) having a pair of beams (5)joined by a plate member (13) or alternatively a generally U-shaped channel having a pair of opposed side walls (33, 34) joined by a further portion (35). In either case an interior space (57) is defined by either the pair of beams (5) and plate member (13) or by the pair of side walls (33, 34) and the further portion (35). A cementitious material, such as concrete, occupies a substantial volume of the interior space (57) and the building structural element (1) has a post-tensioned pre-stressing force applied thereto.