STRUCTURAL REPAIR OF PRESTRESSED CONCRETE BRIDGE …

STRUCTURAL REPAIR OF PRESTRESSED CONCRETE BRIDGE GIRDERS Jarret Lee Kasan, M.S. University of Pittsburgh, 2009 It is common practice that aging and structurally damaged prestressed concrete bridge members are taken out of service and replaced. This, however, is …

US2859504A - Process of making prestressed concrete ...

The process of making prestressed concrete structures which is characterized by the steps of casting a concrete structure with long straight reinforcing rods extending from end to end, and shorter rods which have one of their ends anchored in inaccessible locations in the concrete of the structure and their unanchored ends exposed in recesses ...

Bridge Concrete Girders - YouTube

May 13, 2015· NECA setting 90,000 lb pre-stressed concrete girders for bridge in Navajo, NM on May 05, 2015.

US3341639A - Method for grouting girders supporting ...

(Cl. 26435) The invention relates to a method of applying grout to a metallic beam, truss or girder (all herein generically called girders, for convenience) which girder supports a concrete slab, and to a grouting form, including supporting means therefor, suitable for practicing the method.

DIY Concrete Patio in 8 Easy Steps | How to pour concrete slab

It's easy to pour and build a backyard patio made of concrete in this How To article. On a small scale, concrete is fairly easy to work with, but installing an entire patio can be a challenge. It is possible to build an attractive concrete patio yourself, but careful planning and preparation is necessary.Be sure to place all the concrete at once; a big patio can be broken down into smaller ...

Metrorrey's linea 2 extension viaduct: A precast - PCI

the typical box-girder cross sections for light-rail bridges. n This paper was originally presented at the 2007 PCI Convention and National Bridge Conference and was a 2008 PCI Design Award winner for Best Non-highway Bridge. Metrorrey's linea 2 extension viaduct: A revolution for light-rail precast concrete segmental bridges

GUIDE TO RECOMMENDED PRACTICE FOR THE REPAIR OF …

GUIDE TO RECOMMENDED PRACTICE FOR THE REPAIR OF IMPACT-DAMAGED PRESTRESSED CONCRETE BRIDGE GIRDERS Prepared for the National Cooperative Highway Research Program Transportation Research Board of The National Academies Kent A. Harries, Ph.D., FACI, P.Eng. Jarret Kasan, Ph.D. University of Pittsburgh, Pittsburgh PA Richard Miller, Ph.D., FPCI, P.E.

PRECAST I-GIRDER CRACKING: CAUSES AND DESIGN DETAILS

PRECAST I-GIRDER CRACKING: CAUSES AND DESIGN DETAILS PREPARED FOR THE MISSOURI DEPARTMENT OF TRANSPORTATION IN COOPERATION WITH THE ... research performed to determine the causes of cracking in continuous prestressed concrete I-girder bridges. Three research tasks were undertaken by UMC. They were (1) to study early-age cracking due to heat

REPAIR OF DAMAGED PRESTRESSED CONCRETE GIRDER

REPAIR OF DAMAGED PRESTRESSED CONCRETE GIRDER AASHTO Midwest Bridge Preservation Conference, Detroit, MI ... Sounding of girder concrete Measure loss of camber using level rod 5. ... • Preventing corrosion of strands and reinforcing steel, and • Using compatible grout to replace the broken concrete. 7. Corrosion Protection Corrosion ...

Recommended Practice for Segmental Construction in ...

Recommended Practice for Segmental Construction in Prestressed Concrete Reported by PCI Committee on Segmental Construction JOHN M. HANSON (Chairman) HERBERT A. BRAUNER MORRIS SCHUPACK THOMAS J. DARCY WILLIAM. M. SLATER HEINZ P. KORETZKY MARIO G. SUAREZ VILAS MUJUMDAR H. E. WESTENBERG BERNARD OBRIEN GUY PETRILLO Y. C. …

Evaluation and Repair Procedures for Precast/Prestressed ...

TRB's National Cooperative Highway Research Program (NCHRP) Report 654: Evaluation and Repair Procedures for Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web explores the acceptance, repair, or rejection of precast/prestressed concrete girders with …

CN103148763A - Detection method for concrete hollow slab ...

The invention relates to the technical field of the crack detection, in particular to a detection method for the concrete hollow slab girder hinge joint damage. The detection method for the concrete hollow slab girder hinge joint damage is characterized in that the relative dynamic displacement extreme value of the slab girder hinge joint position is recorded in a mechanical mode; the slab ...

Girder bridge - Wikipedia

A girder bridge is a bridge that uses girders as the means of supporting its deck. The two most common types of modern steel girder bridge are plate and box. [citation needed]The term "girder" is often used interchangeably with "beam" in reference to bridge design.

708 - Prestressed Concrete - MDOT Wiki

708 Prestressed Concrete 2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 708. Contents. ... broken corner at end of PCI girder. Figure 708.8 – Minor damage – spalled bottom corner at the end of a box beam. ... Do not stand behind the jacking machine or rod holes during jacking procedures. If a tendon or rod snaps, it can cause ...

Girder - Wikipedia

A girder / ˈ ɡ ɜːr d ər / is a support beam used in construction. It is the main horizontal support of a structure which supports smaller beams. Girders often have an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms.A girder is commonly used to build bridges.

Inspection Manual for Precast Concrete Pipe and Structures

Inspection Manual for Precast Concrete Pipe and Structures . May 2014 . Table of Contents . ... Compressive strength determined by the three-edge bearing machine for reinforced concrete pipe is expressed as the D-load. D-load is defined in ... PRECAST CONCRETE PIPE AND STRUCTURES.

CN104480868A - Beam detaching method for road bridge ...

[0010] The overall stability of the beam, all hinge joints concrete girder concrete using open chain cutting machine, corresponding to about the center line of two lines both within the 10cm long range reserved for the hinge slit is not cut through, to be seated erecting machine after erecting machine with a crane girder to the stress state ...

Application of NDT method for the concrete girder damaged ...

Application of NDT method for the concrete girder damaged by chloride Masahiro Ishida1, Osamu Usami2, Akiko Hiroe3 Abstract Recently corrosion and rupture of the pres tressing tendons occur in Japan while the aging of the road bridges progresses because most of them were constructed in Japan's rapid economic growth period.

Tunnel Boring Machine - an overview | ScienceDirect Topics

May 31, 2015· Two key parts for rock boring are the cutter head and the cutters, that is, the rock is broken by the cutters in the cutter head. Fig. 7.8 shows a cutter head with the cutters in a boring machine. The boring machine drives the cutter head to rotate in the big hole or tunnel, while all the cutters rotate themselves surrounding their own shafts.

repair manual for concrete bridge elements V2

Repair Manual for Concrete Bridge Elements Page 1 1.0 Introduction Concrete girders are frequently damaged by over-height impacts, fire or corrosion. Minor damage to the girders can consist of cracking or shallow spalls, whereas serious damage can extend to concrete, reinforcing steel and prestressing steel. Minor damage can affect

Chapter 14 - Prestressed Concrete Girders

Volume 3: Structural Drafting Standards – Chapter 14: Prestressed Concrete Girders Drafting and Design Presentation Standards Manual, Transport and Main Roads, March 2018 2 . Figure 14.3(b) - Girder joints . 14.4 Standard design details Standard Super T-girder design sheets have been developed in Structures and Marine Engineering

Form DOT F 1700 - CTR Library

Research study title: "Repair of Impact Damaged Prestressed Concrete Girders" 16. Abstract In assessing damage to a prestressed bridge girder, it is often necessary to determine the prestress remaining in the strands. A device was developed to estimate stress level in strands in damaged bridges. ... 5.1.2 Tests in the Universal Test Machine ...

Precast Concrete Girder, Precast Concrete Girder Suppliers ...

Alibaba.com offers 242 precast concrete girder products. About 41% of these are gantry cranes, 23% are formwork, and 5% are metal building materials. A wide variety of precast concrete girder options are available to you, such as free samples.

Hand-held Concrete Floor Scabbler Manufacturers and ...

Application: Hand-push pneumatic concrete scabbler machine is mainly used in highway, railway bridge and box girder concrete surface layer atuck between chisel; Buildings and municipal engineering concrete wall, ground surface cut hair, repair, renovation, secondary reinforcement, metal cleaning, decorative stone field .

concrete girder, concrete girder Suppliers and ...

A wide variety of concrete girder options are available to you, such as construction hoist. You can also choose from stainless steel, steel. There are 1,407 concrete girder suppliers, mainly located in Asia. The top supplying countries or regions are China, Malaysia, and Singapore, which supply 99%, 1%, and 1% of concrete girder respectively.

THE STRENGTH OF CONCRETE BEAMS - USGS

THE STRENGTH OF CONCRETE BEAMS. By RICHARD L. HUMPHREY. INTRODUCTION. SCOPE OF INVESTIGATIONS. The tests of concrete beams described in this bulletin form a part of a comprehensive series of investigations undertaken by the United States Geological-Survey for the purpose of determining the strength of concrete and reinforced concrete.

THE FREYSSINET PRESTRESSED CONCRETE CO. LTD.

THE FREYSSINET PRESTRESSED CONCRETE COMPANY LTD. Page: 6 ANCHORAGE SYSTEMS Prestressing forces of the Tendons are transferred to the concrete structures through Anchorages. Anchorage for the Post Tensioning system normally comprises of a steel plates with a number of conical holes, the conical Grips and the Guide (Trumpet).

Bridge Design Manual - LRFD: Spliced Precast Girders

Refer to Section 4, Pretensioned Concrete I Beams and I Girders for interface shear design of the deck to girder flange interface. Show predicted slab deflections should be shown on the plans. Compute deflections using the same composite sections (constant modulus for girder and deck, or transformed sections) used in the analysis. ...