The International Information Center for Structural Engineers

Thursday, 25 August 2016 14:00

Wood in construction: efficiency and saving

Although concrete and steel are the most commonly used building materials, a structure made of wood  and 53 m tall is being constructed,  and is attracting the interest of most engineers. It is located in Vancouver and scheduled to house more than 400 students of University of British Columbia. Construction began in November 2015 and will be completed until 2017!

Thursday, 25 August 2016 14:02

Interior Slab Bracket (ISB) for Interior Slab Remediation Featured

Save time and money with the CHANCE® Interior Slab Bracket from Hubbell Power Systems, Inc. The multi-arm slab bracket is designed to assist in the reduction of piles required for slab-on-grade foundation remediation and to provide pile location flexibility. When used in conjunction with the patented CHANCE Combination (SS-RS) Combo Pile, the ISB can result in overall lower project costs while maintaining the desired load requirements.

Key Benefits:

  • Low cost repair option versus demolition and slab replacement
  • Optimal load distribution reduces the number of piles per standard industry methods Less project piles equals reduced excavation Material and labor savings
  • Bracket placement flexibility avoids expensive interior finishes
  • Load capacity ratings: 57 kip Ultimate / 28 kip working
  • Designed for on grade applications and interior slab remediation
  • Option versus demolition and slab replacement
  • Your competitive edge – Optimal load disbursement reduces the number of piles required on a remediation project as compared to available industry methods
  • Bracket placement flexibility to avoid disruption of expensive interior finishes [i.e. high end kitchens, tile work, etc.]

 

Read all the information and instructions for the Interior Slab Bracket here 

Source: http://www.abchance.com/

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BACKGROUND

Built in 1901, the historic train station is located in Downtown Richmond. The city is revitalizing their city center to attract new shops and foot traffic. The train station will provide passenger traffic, increasing the accessibility of the area.

PROBLEM

The train station had not been active for several years. It was in need of pile foundations to support new structural loads as well as the installation of an elevator, requiring earth retention. However, it was going to be difficult to install high capacity piles and earth retention in an old, existing building with low head room conditions. Furthermore, the original soil under the train station consisted of 20 ft. of fill. The engineer determined that the site needed a high capacity pile to penetrate the weathered rock and reach a capacity of 90 kips ultimate capacity.

SOLUTION

The structural design team specified CHANCE® Helical Pulldown® Micropiles for the job. The Helical Pulldown Micropiles would penetrate the fill in low head room conditions and obtain the 90 kips ultimate capacity. After running the HeliCAP® Helical Capacity Design Software, it was determined that a SS175 8/10 leads with a 5 in. grout column approximately 30 ft. would yield the required 90 kips ultimate. During the installation process, the CHANCE Certified installer, Stable Foundations, pre-drilled the top 20 ft. for the helical piles to penetrate the weathered rock bearing.

All 48 piles were installed successfully to an average 30 ft. depth. Following the installation of the original 48 piles, the engineer planned to add an elevator 10 ft. x 12 ft. x 7 ft. deep at the first floor level, supported on CHANCE piles. Earth retention in low headroom conditions presents a problem because you can’t get larger “soldier” beams or h-piles into the soil for perimeter earth support economically. Large equipment was not an option for conventional shoring – consisting of h-piles driven around the perimeter – or soil nailing since the area was so small.

Therefore, Stable Foundations devised a system utilizing CHANCE RS2875.276 wall pipe filled with grout as the perimeter piles. They also used the CHANCE ROCK-IT™ lead section that has a carbide tooth welded on the lead point. The new ROCK-IT lead allowed them to install the 12 perimeter piles around the 10 ft. x 12 ft. pit without pre-drilling.

Threaded studs were welded on the outside of the Helical Pulldown Micropiles to hold the wood lagging to retain the earth. Internal whales were added to the system so the pit could extend 7 ft. below ground, which allowed the elevator shaft to be built. Once the pit was excavated to grade, six CHANCE Helical Pulldown Micropiles were specified to support the elevator pit. They used the new ROCK-IT leads to install the piles to bearing without having to pre-drill. CHANCE continues to find new ways to improve their products which, in this installation, removed the pre-drilling process saving a day’s worth of work.

Read the whole article here

Source: http://www.abchance.com/

TheStructuralEngineer.info is glad to present Hubbell's - CHANCE® Combination (SS-RS) Helical Cast Transition!

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Wednesday, 10 August 2016 12:37

Hubbell: Helical Pulldown Micropiles (HPM) Featured

Hubbell Inc. is excited to introduce to you Helical Pulldown Micropiles (HPM).

The Alexander, a tall building in New York City stands out from all other buildings in the area. The designers had promised a luxurious building, which would provide relaxation and convenience. Nevertheless, the building has been in operation since 2008, and current owners complain about a number of issues. On the other hand, the designers assure the residents that there is no reason for concern.

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Monday, 01 August 2016 11:56

Hubbell: Underpinning Brackets Featured

Standard-Duty Underpinning Brackets for Helical Pile Foundation System For use with 1 1/2″ and 1 3/4″ square shaft anchors, as specified below, each bracket is identified by the size stamped on the vertical gusset. Brackets also may be used in conjunction with Uplift-Restraint Bracket. Bracket comes complete with the hardware required for assembly of bracket; does not include concrete anchor bolts.

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