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April 9, 2019 0

BPB-A/BPB-A-T
Pore Pressure Transducer

  • Water pressure measurement
  • 200 kPa to 2 MPa..
  • With temperature measuring function

 

Embedded in a boring or together with a pile or steel sheet pile. These transducers measure pore water pressure

●Small-sized design, 30 mm in outer diameter, enables installation in borings of small diameters.

●Flat filters FB-10SUS (10 μm mesh standard) are provided to prevent the sensing part from clogging.

●Stainless steel case (Including a FB-10SUS)

Embedded in a boring or together with a pile or steel sheet pile, BPB-A/BPB-A-T series transducers measure pore water pressures or pore pressures. If desired, they can be used as pressure-based underground water level transducers by installing in a well. The BPB-A-T series is provided with temperature measuring function for simultaneous measurement of pore pressure and temperature. The cable length may be changed as specified.

Dowload catalog: Click here

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April 9, 2019 0

RRR renders a high stability and minimizes deformation. It is applied to retaining wall systems up to considerable height. This Manual is intended for design and construction of GRS-RW system up to a maximum height of 10 m. Beyond this height, the design specialists should be consulted. For applications other than highways, related specifications and guidelines should also be consulted.

1. Features of 3R retaining wall systems and scope of application

a. Features of 3R retaining wall systems

FR Grid is a fiber net of highly strong vinyl fibers that have been immersed in resin.

FR Grid is reinforcing materials for RRR-method. 3R retaining wall has advantages as followings:

  • Exhibit high strength, offering soil confinement and reinforced fill.
  •  Perform high weathering, chemical, and thermal (cold and heat) resistance.
  •  Perform high impact resistance.

Perform high creep properties

  • Easy to construct and quality control. Be able to construct in smaller area in compare which tradition earth retaining wall.
  • The amount of soil is significant lower in comparison with tradition earth retaining wall.
  •  Retain the strength against the impact road of seism load and the repeated load of running train. 

​a.    Scope of Application

Retaining 3R is applied in the following cases:

  • Expansion of existing roads, constructions
  • Using for positive and negative slope retaining walls
  • Tunnel face strengthening
  • Bridge pier and foundation strengthening

Applied technical specification

RRR renders a high stability and minimizes deformation. It is applicable to retaining wall systems up to considerable height. This Manual is intended for design and construction of GRS-RW system up to a maximum height of 10 m. Beyond this height, the design specialists should be consulted. For applications other than highways, related specifications and guidelines should also be consulted.

A list of relevant Japanese specifications and guidelines related to designing, constructing and inspecting are given below:

  • Highway Bridge Specification, Vol. 4 – Substructures, Japan Highway Public Corporation.
  • Specifications of Highway Earthwork, Retaining Walls, Culverts and Temporary Structures, Japan Highway Public Corporation
  • Specifications of Structural Design of Building Foundation, Japan Architectural Society.
  • Design and Construction Manual of Geotextile-Reinforced Soil Structures, Public Works Research Institute, Ministry of Construction

References:

  • Design Standards for Soil Railway Structures, publisher Maruzen
  • Design Standards for Concrete Railway Structures, publisher Maruzen
  • Design Standards for Railway Structures – Foundation Structures and Retaining Structures, Japan Society of Civil Engineers
  • Design Standard for Railway Structures – Reinforced Concrete and Unreinforced Concrete Structures, Japan Society of Civil Engineers
  • Design and Construction Manual for Mixing Foundation, Japan Railway Technical Research Institute.
  • Design and Construction Guidelines for Reinforced Soil Structures, Japan Railway Technical Research, Japan Railway Technical Research Institute.

Some pictures for 3R retaining wall applications

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April 1, 2019 0

BR-BT

  • Stress Measurement
  • 2 to 10MPa
  • With Temperature Measuring Function

Enables measure concrete stress directly as stress and not via strain

  • Theoretically backed performance of direct concrete stress measurement with no conversion from a detected strain quantity.
  • Receive minimal effects of creep and changing elastic modulus of concrete. and there by ensure accurate stress measurement.
  • Also usable for stress measurement of the natural ground by installing at the rear of a tunnel lining.

A temperature measuring function enable them to measure stress and temperature simultaneously.

Dowload catalog: Click here

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April 1, 2019 0

DTP-D-S                                

●For Large Displacement Measurement

●500 to 5000 mm

Large Displacement Measurement and High-Level Output in Each Capacity

DTP-D-S displacement transducers are designed to measure displacement by converting expansion/ contraction of a sensing wire to electric signal by potentiometer. Four models are available with rated capacity 500, 1000, 2000 and 5000 mm, all providing a high rated output of 5 mV/V. In addition, measuring force of the wire is constant, thereby making these transducers easy to use.

●Compact, lightweight, and easy to install

●Measurement possible with strain amplifier

●Constant measuring force of the wire
(with differences between pull-out and pull-in)

●Stainless steel wire is used (SUS 304).

※For cases where the transducer mainframe cannot be mounted to a steady point by attaching the tube to the wire outlet, KYOWA can offer a type which enables displacement measurement by fixing the tip of the tube to a steady point. (Free Free Steady Point Type steady point type

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April 1, 2019 0

Rock gabion composite is a material bag made of fiber which is called “ECOPET®” recycled from PET bottle. This product has lightweight, high durability and environmentally friendly. Rock gabion was proposed to use to protect river bank, abutment, and block the flood. “ECOPET®” is business registration name of TEIJIN FIBERS Co., Ltd.

1. Features

§  It is made of specific chemical fiber and able to prevent corrosion

§  Raschel netting structure and hard to get broken and loose.

  • It has also double net structure and makes it even harder spread out the rocks.
  • Flat mouth and hard to catch floating wreckage
  • Crushed concrete can also be used instead of rocks.
  • Easy to handle by machines. No need to have skilled special skilled worker  

2. Installation process