摘要:
A coinjection molding apparatus is disclosed that provides a skin material melt stream and a core material melt stream to a nozzle. A nozzle tip of the nozzle defines a central skin material melt passage for receiving the skin material melt stream, an annular core material melt passage for receiving the core material melt stream and an annular outer layer melt passage, which receives a portion of the skin material melt stream from the central skin material melt passage. The skin material melt stream from the central skin material melt passage forms an inner layer of a molded article, the core material melt stream from the core material melt passage forms a core layer of the molded article, and the skin material melt stream from the outer layer melt passage forms an outer layer of the molded article, wherein the three melt streams combine prior to entering a mold cavity.
摘要:
A seawall element and installation apparatus therefor, the seawall element including an elongated plastic tubular member having a uniform hollow elliptic or oval-shaped cross section and open at each end thereof. The tubular member has a cylindrically-shaped male portion and cavity interlocking arrangement for interlocking two side by side tubular members together by slidable overlapping substantially watertight engagement lengthwise of one tubular member to another. A seawall structure includes a plurality of these seawall tubular members positioned side by side in self-locking engagement to form a row and supported by being supportively embedded into the earth. An elongated cast concrete reinforcing cap extends along and interconnects an upper end portion of each of the seawall tubular members and extends monolithically into each of the tubular member upon deployment. An apparatus for water jetting each tubular member into bottom ground is also disclosed.
摘要:
A plurality of floatable modular caissons are constructed onshore, either in whole or in part, towed to a desired site for port and harbor construction, expansion or modernization, precisely trimmed and ballasted down, and assembled in different combinations to form marine structures and/or integrated marine structures/marine cargo terminals to construct breakwaters, breakwater piers, bulkhead wharves, wharves and piers. The breakwaters and/or breakwater piers are arranged to form a protected port or harbor and are designed to withstand maximum force waves and winds at the harbor site. As an integral part of the breakwater piers, modular caissons are assembled to form marine cargo terminals, such as liquid bulk terminals and LNG/LPG terminals. On the leeward side of the breakwaters and/or breakwater piers, other modular caissons are assembled to form a wide variety of marine structures (such as bulkhead wharves, wharves and piers) and/or integrated marine structures/marine cargo terminals (such as dry bulk and liquid bulk terminals, container terminals, general cargo terminals, roll-on/roll-off terminals and the like). The various marine structures and integrated marine structures/marine cargo terminals may be disassembled and the caissons ballasted up and towed away for use at another port and harbor site. The rapid deployment and assembly potential of the marine structures/marine terminals as well as their potential for rapid disassembly and removal to another site makes the modular caissons ideally suited for many naval and military applications.
摘要:
A facing panel is added to a surface of a geocell, on an outboard face of the cell, exposed to free water forces. The facing panel is filled with either stone, concrete, wooden boards, plastic sheets or steel sheets. In concrete usage, synthetic drainage is introduced to prevent the buildup of hydrostatic pressures behind the facing panel. The facing panel creates the ability to construct vertical retaining walls by stacking geocell units on top of each other and then filling a facing panel with either stone or concrete for a completed wall face. The geocell units are filled with sand or shell as retained in the geocells by geotextile liners. Circular geocells also retain fill in a geotechnical structure. Circular compartments are formed by connecting plastic mesh material at points on the compartment circumference, thus producing a cylindrical confinement of granular fill. The geotechnical structure thus formed may be used in a variety of applications such as bulkheads, vertical walls, wave breaks, the side of an artificial island, confinement berms, and columns to support vertical loads.
摘要:
Method and apparatus for making a dock or seawall. A forming float device, comprising a forming deck and ballasting means therebelow, floats in a body of water a selected distance from the shoreline. A first wall section is formed on the top surface of the forming deck, such that the first wall section rests horizontally on the surface of the deck, and comprises a plurality of wall pieces whereby the wall pieces are aligned and shaped appropriately to together provide a uniform wall. Each wall piece is fastened by fastening means to the top surface of the forming deck. Earth reinforcing strips are installed in each wall piece such that the earth reinforcing strips extend upwardly from the wall pieces generally perpendicular to the planes defined by the wall section and forming deck and the earth reinforcing strips are secured in that upward position. Alternatively, a bundle of cylindrical containers may be attached together and to the wall section. The forming float device is rotated 90.degree. by means of ballasting means so that the wall section assumes a generally perpendicular position and the wall section is then rested on a pre-selected location of the floor of the body of water. Backfill is placed between the shoreline and the wall section such that the earth reinforcing strips and wall pieces are made to stabilize and maintain position. (Or, if cylinders are used, backfill is placed in and around the cylinders.) The forming float device is then freed from the wall section by unfastening the fastening means. Finally, the forming float device is rotated to its original orientation and refloated to the surface of the water by means of the ballasting means. The foregoing steps are repeated for each successive wall section to comprise the dock or sea wall and each successive wall section is positioned on the floor of the body of water adjacent to the previously placed section.
摘要:
The seawall extends along and retainingly engages the ground and at its top extends above the ground level and at its bottom is projected and anchored down into the ground, below the water level. The seawall includes a series of laterally aligned elongated corrugated bulkhead strips made from a plastic material. Each strip has along one side an undercut grooved edge and along its other side a similarly shaped tongue edge, with the tongue and groove edges of adjacent bulkhead strips interlocked. The strips are of such lightweight that each strip may be lifted and assembled manually relative to an adjacent anchored strip and driven into the ground and into lateral alignment with an adjacent strip and a longitudinal interlock. A cap overlies and is secured upon a bulkhead strip. Spaced anchor strips are embedded into the ground and spaced from the seawall and connected to corresponding bulkhead strips by a series of tie rods and flexible walers.
摘要:
Plastics material mesh which has spaced, longitudinal, oriented strands is used to form a retainer construction for retaining fill in a geotechnical structure. Triangular compartments are formed by having a number of parallel elongate portions of the mesh and interconnecting them by zig-zag portions, each zig-zag portion thus being mainly contained between the two respective elongate portions, and being joined to the adjacent zig-zag portion at respective corners of the compartments. The connections are made by transversely bending the strands of one portion to form loops which project out the opposite side of the other portion, and passing a connecting member through the loops to prevent the loops being pulled back.
摘要:
Man portable panels are utilized to provide slope protection to a watercourse, the panels being placed in vertical layers, and being secured in place by deadman elements buried in earth fill behind the panels. In one preferred embodiment the panels are made of weathering steel and are L-shaped in cross-section, and in a second preferred embodiment each panel is comprised of interlocked rectangular sections of extruded plastic.
摘要:
A crib unit of heavy, rugged character and which is useable in erecting bin wall structures for various purposes such as sea walls, retaining walls, etc. The unit has a pair of spaced side walls with a connector arm extending between the side walls and joined thereto with merger segments, the merger segments being of laterally widening character to effect strengthening of the side walls to render same more resistive to bending. The crib unit when paired with a like unit encloses a bin space having a configuration which facilitates substantially uniformly distributing bin fill pressure acting against the crib unit structure defining the bin.