Showing papers on "Embedment published in 1970"

Prediction of Footing Vibrations

Abstract: The vibrations of massive footings on soil are investigated. The experiments with bodies having variable mass and foundation base size are compared with the half-space theory. The amplitudes of vertical vibrations are found to be considerably larger than the theoretical values derived for a rigid body. This indicates that the soil behaves rather like an elastic stratum with reflection of elastic waves. Also the changes in resonant frequency with foundation base size correspond rather to an elastic stratum. Due to the nonlinearity of vibration the resonant frequency changes with amplitudes are not directly proportional to the exciting force. With some kinds of soil, these effects increase with decrease in amplitude. With sands nonlinearity is usually negligible. The effect of embedment is studied experimentally for both vertical and horizontal vibrations. The amplitudes decrease and the natural frequencies increase when the depth of embedment increases. The effect of undisturbed soil is much greater than the effect of the side fill.

Anchor insert and setting cone for a precast concrete body

Abstract: An anchor insert and a cooperating setting cone, the insert being designed for embedment in a concrete slab or other body, and the cone constituting a hole-forming pattern member which, when extracted from the hardened concrete, exposes a limited portion of the insert and renders it accessible for slab-lifting purposes Novel cone-extracting means in the form of a torque rod facilitates breaking of the bond between the cone and the concrete and lifting the cone from the hole which it establishes in the concrete

Cast reinforced housing and method of making the same

Abstract: A cast reinforced housing comprises a cast peripheral housing wall defining an interior chamber for the components of an apparatus and preferably consisting of cast aluminum. At least one reinforcing embedment is provided in the wall and consists of a material having greater strength than the material of the wall, for example steel.

Method of forming a concrete building component

Abstract: A building component composed of concrete blocks and a concrete slab with the blocks being recessed along their frontal surfaces for placement within a jig. The concrete receiving surfaces of the blocks are irregular for embedment within the poured concrete. The blocks are in contiguous, surface contact to retain and confine the concrete poured thereon. A method for the face down construction is disclosed.

Production of pile fabrics

Abstract: METHOD OF BACK-COATING PILE CARPET CONTAINING PILE YARNS BOUND BY EMBEDMENT IN A RELATIVELY IMPREVIOUS POLYMER LAYER COMPRISING THE STEPS OF PERFORATING THE IMPERVIOUS LAYER TO PERMIT PASSAGE OF GASES THERETHROUGH, AND APPLYING A HEAT BONDABLE POLYMERIC BACK-COATING TO THE PERFORATED CARPET.

Embedment-type coil assembly

Abstract: An embedment-type transformer coil assembly is disclosed particularly suited for a transformer application, together with a novel method and coil form for embedding the primary and secondary transformer windings within a unitary embedment material. An inner elongated tubular member is connected by means of a top panel skeletal structure to an outer shorter tubular member defining a minor molding space therebetween. The top panel skeletal structure defines spaces through which embedment material can be conducted, thereby to embed leads from the windings which extend into the minor molding space. The top panel may comprise a plurality of terminal lugs to which the leads can be connected. In the embedding process, the form is placed in an upstanding position in an open mold cavity which is filled to its upper level with embedment material. Embedment material can then be added to the minor molding space between the tubular members, thereby to embed the leads and form a unitary embedment structure, thus providing full protection for the primary and secondary transformer windings and their associated leads.

Casting method for plastic components

Abstract: The casting mould is made up of sections which can be heated. The mould is hermetically sealed and evacuated. Subseq. the mould is connected to a container holding liquid plastic material. Attachments e.g. bolts, handles, hinges, etc. can be placed in the mould for subsequent embedment into the plastic material. In addition to these reinforcing material e.g. glass fibre can be placed in the mould for embedment into plastic material.

Dynamic behavior of embedded foundation-soil systems

Abstract: DEVELOPMENT OF THEORETICAL SOLUTIONS TO THE PROBLEMS OF DYNAMIC INTERACTION BETWEEN FOUNDATION AND UNDERLYING SOILS IS DISCUSSED WITH A VIEW TO IDEALIZATIONS AND UNCERTAINTIES ASSOCIATED WITH THE THEORIES, WITH A PARTICULAR EMPHASIS ON THE EFFECT OF EMBEDMENT ON THE INTERACTION. AN EXPERIMENTAL INVESTIGATION TO STUDY THE DYNAMIC BEHAVIOR OF EMBEDDED FOUNDATION-SOIL SYSTEMS IS DESCRIBED. BASED ON SMALL-SCALE MODEL TESTS ON FOOTINGS OF VARIOUS SIZES AND SHAPES, EVALUATION IS MADE OF THE EFFECT OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SHAPE ON THE DYNAMIC RESPONSE OF THE SYSTEM. IT IS FOUND THAT THE AMPLITUDE OF MOTION OF THE EMBEDDED FOUNDATION IS GREATLY REDUCED BY THE ADDITIONAL SHEARING RESISTANCE ALONG SIDES OF THE FOUNDATION AND A SHIFT IN THE CONTACT PRESSURE DISTRIBUTION. EMBEDMENT IS FOUND, HOWEVER, TO HAVE NO APPRECIABLE EFFECT ON THE RESONANT FREQUENCY OF THE SYSTEM. THE SYSTEM WITH A HIGHER MASS RATIO PRODUCES A GREATER AMPLITUDE FOR A GIVEN DEPTH OF EMBEDMENT, BUT THE EFFECT OF MASS RATIO BECOMES SMALLER WITH INCREASING EMBEDMENT DEPTH. THE EFFECTS OF EMBEDMENT DEPTH, MASS RATIO, AND FOUNDATION SIZE ARE EXPRESSED IN TERMS OF TWO NEWLY DEFINED DIMENSIONLESS PARAMETERS, THE AMPLITUDE REDUCTION COEFFICIENT AND THE EMBEDMENT FACTOR, BY MEANS OF WHICH THE DYNAMIC RESPONSE OF EMBEDDED FOUNDATIONS CAN BE ADEQUATELY DETERMINED. /AUTHOR/

Explosive embedment anchor projectile

Abstract: An explosive embedment anchor for use in all types of ocean bottom sediments except consolidated rock The anchor forms the projectile which is fitted to the gun barrel The assembly is lowered to the ocean floor and a charge in the gun is detonated by contact therewith to drive the anchor into the sediment The anchor is provided with a pair of hinged flukes having keying flaps on their upper edges and riser cables Holding power is achieved by an upward pull on the riser cables causing the keying flaps to wedge against the wall of the crater formed by the anchor''s entry and the flukes open to provide maximum pullout resistance

Dynamic Response Of Embedded Strip AndRectangular Foundations Using A PoroelasticBEM

Abstract: The dynamic response of embedded strip and rectangular shallow foundations subjected to time-harmonic vertical excitations is studied. A dynamic poroelastic plane strain BEM formulation is utilized to solve the strip foundation problems while a full three dimensional BEM is used for square and rectangular foundations. The paper aims to extend the previous work on the dynamic response of strip footings on the surface of poroelastic soil media to account for foundation embedment. The effect of different embedment ratios and permeability values of the soil on the vertical and horizontal compliance of such foundations is investigated.

Comparison of maximum moment, tie rod force and embedment depth of anchored sheet pile

Abstract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

Experimental Investigation of Small Scale Lined and Unlined Cylindrical Cavities in Rock-Like Materials.

Abstract: : The behavior of rock-like model structures simulating lined and unlined tunnels was determined experimentally by use of strain and displacement gages. Primary interest was in the response of the composite rock-liner structure rather than the interaction between the two elements. Tests were made of two liner thicknesses of two different Young's moduli in plane stress and plane strain. The liner had little effect until certain values of thickness, stiffness, and strength were obtained. Theoretically, thick, stiff liners should prevent tension at the top and bottom of the tunnel, but this condition was difficult to obtain experimentally. Major problems solved were the design of rock-like materials and embedment of strain gages. Early tensile failure caused deviation of strain readings from the theoretical elastic solution depending upon the gage position. Other gages registered approximate theoretical values after initial fracture. Initial fracture and consequent alteration of stress and strain distribution resulted in an overall response which approaches that of natural rock. Models tested in the centrifuge responded in a similar manner, although the gage readings were less consistent. (Author)

A concept of preengineered, prefabricated, prestressed modular and multimodular sealing systems for modern bridges and structures

Abstract: SINGLE-MODULE, MODULAR, AND MULTIMODULAR SEALING SYSTEMS APPEAR TO OFFER LONG-TERM, MAINTENANCE-FREE SOLUTIONS TO NEWLY DEVELOPING PROBLEMS AT BRIDGE JOINTS BROUGHT ABOUT BY NEW DESIGN SOPHISTICATION. THE NEED FOR ARMORED JOINTS AND THEIR DAMPING EFFECT TOGETHER WITH IMPROVED EMBEDMENT PRACTICES ARE DISCUSSED. UPWARD AND DOWNWARD VERTICAL FORCES, ROTATION, DEFLECTION, AND HORIZONTAL THRUST MOVEMENTS AND THEIR EFFECT ON SEAL SHAPES ARE ILLUSTRATED. THE TYPICAL BRIDGE-JOINT ENVIRONMENT CLEARLY DICTATES THE NEED FOR HEAVY-DUTY SEAL CONFIGURATIONS. WEB, TOP, AND SIDE MINIMUMS, DEPTH-TO-WIDTH RATIOS, AND PRESSURE-GENERATION REQUIREMENTS ARE PRESENTED AND ANALYZED. SOME METHODS OF RELIABLE DECK TEMPERATURE DETERMINATION AND ADJUSTMENT FOR TEMPERATURE ARE GIVEN. CREEP--SHRINK CALCULATIONS AND TESTING OF MODULAR AND MULTIMODULAR SYSTEMS ARE ILLUSTRATED. /AUTHOR/