Questions and Answers
a white thing is out frm these walls i want some remedies so as to avoid this and even be away from decreasing the strength of walls and even structures such slabs or footings or columns………im in dilemma plz help me out
Actually my adjacent property people(back side) have raised there plinth level upto our slab level thats the problem,water percolating frm soil nd entering my house walls..
You have to talk to structural designer with relevant data like hight & width of unsuported wall,wall thickness,water table,drainage system around both buildings.
Storm water system of neighbour’s building should also be checked so that if required water outlet location could be changed.
What you can do from your side of wall is to make injection grouting in wall backing at certain location with water proofing compound. It will also be better, if possible, to provide a drainage out let (weep hole) to release water accumulation from retaining side near the floor in wall.This outlet you can connect to your drainage system.If the water coming out from weep hole is not a clear water then you have to create a artificial filter on back of weep hole. For this you have to make one more hole at lower level below the first weep hole ,In this lower hole you have to fix a threaded nipple with blind(stopper).Mean while you make artificial filter in back of upper hole ,you can allow water temporary from this other hole.
Be remember that in any case you have to close weep hole if you are unable to stop flow of soil with water from weep hole.
Powdering on wall inform you that water is accumulating on back side of wall.
Designer may suggest to built additional pillars in wall from your side.Pillar & wall can be connected by steel connector & pocketing in existing wall.
Any water proofing on wall from your side face will be wasteful of money.
Why in injection grouting we utlized Grouting material likeGP1/2 instude of neat cement slurry?
adminThis is an Engineering or Construction or Oil question, not Sculpture. Not sure why Y!A offered Sculpture up. Question also has several spelling errors (utilized, instead)
Q#1- Recently appears another fee in our EBMUD billing statement, which is called “Seismic Improvement Program
This statement meansClaremont Tunnel Seismic UpgradeThe 3.4-mile Claremont Tunnel, originally completed in 1929, is a major water supply artery delivering up to 175 million gallons per day of treated water from EBMUD’s Orinda Water Treatment Plant to more than 800,000 customers west of the Oakland-Berkeley Hills. The tunnel crosses the Hayward Fault about 130 feet below Tunnel Road in Berkeley and is very vulnerable to earthquake damage. Improving the tunnel’s earthquake performance is a cornerstone of EBMUD’s Seismic Improvement Program. If the tunnel were to fail after a major earthquake, the impacts would include:
Disruption of water delivery
Reduction in fire fighting capability
Severe water rationing for up to six months during tunnel repairs
Economic losses to the community estimated in 1994 at approximately $1.9 billion
EBMUD is seismically upgrading the tunnel so that it will survive a major earthquake and allow the safe delivery of water after such an event. Construction for the Claremont Tunnel Seismic Upgrade began in June 2004. The work includes:
A new 1,570-foot bypass tunnel to replace the most vulnerable portion of the Claremont Tunnel crossing the Hayward Fault
A 480-foot access tunnel and entry portal at EBMUD’s Claremont Center in Berkeley
Repairs and grout injection reinforcement for the remainder of the existing tunnel between Orinda and Berkeley
The inside of the bypass tunnel is lined with reinforced concrete.
All tunnel excavations and the concrete lining for the bypass tunnel have been completed. By Summer 2006, concrete lining, and the entry portal at the access tunnel will be completed. Repairs in the existing tunnel have also been completed, and during Winter 2006-07, grout injection for the existing tunnel, and the connections between the existing and bypass tunnels will be completed. In Spring 2007, earth fill to cover the access portal structure, and landscaping will be restored at the Claremont Center construction areas. All construction activity, including site clean-up and contractor demobilization, is anticipated to be completed by June 2007.
More information about the Seismic Improvement Program and the latest project newsletter to the community are available as PDF files below. They can be viewed and printed with Adobe Acrobat Reader, a free software.
Seismic Improvement Program Update (295KB)
Seismic Improvement Program 2005 Progress Report (3MB)
For more information or questions about the project please contact Project Liaison Donna Kerger at firstname.lastname@example.org or (510) 287- 0165.
MAI®400NT and MAI®LOG400 – Grouting Injecting …