{"id":2519,"date":"2024-10-11T07:46:42","date_gmt":"2024-10-11T07:46:42","guid":{"rendered":"https:\/\/seabrokers.no\/fundamentering\/?post_type=referanser&p=2519"},"modified":"2024-10-11T07:48:47","modified_gmt":"2024-10-11T07:48:47","slug":"dolo-reff-10-unik-og-innovativ-losmassetunnel-porsgrunn-jetgrunn","status":"publish","type":"referanser","link":"https:\/\/seabrokers.no\/fundamentering\/en\/referanser\/dolo-reff-10-unik-og-innovativ-losmassetunnel-porsgrunn-jetgrunn\/","title":{"rendered":"Dolo Reff 11 Stortingsgata 6, Oslo JETGRUNN"},"content":{"rendered":"

Orientation about the project<\/strong><\/p>\n

Stortingsgaten 6 is a new office complex on 7 floors and a car park on 3 floors below<\/p>\n

listing. The 975m plot is bounded by Stortingsgata, Rosenkrantzgata and Prestegata<\/p>\n

as well as the neighboring building in Stortingsgata 4. Originally there were two buildings on the site;<\/p>\n

Flaggfabrikken and Nordstjerneg\u00e5rden. The flag factory dates from 1895 and is listed.<\/p>\n

Extensive renovation work was initiated to preserve the facade. The building was<\/p>\n

reimbursed with steel core piles for mountains. In connection with these works was built<\/p>\n

inflicted settlement damage on the facade with the consequence that the facade facing the backyard was<\/p>\n

demolished.<\/p>\n

Basic conditions<\/strong><\/p>\n

No basic investigations had been carried out on the property itself, other than a summary of it<\/p>\n

existing information about the ground conditions around Stgt. 6. After Nordstjerneg\u00e5rden<\/p>\n

had been demolished, it was only possible to carry out ground investigations. What was originally thought<\/p>\n

mountain level elevation -05 and -1.0 turned out to be the top of a powerfully permeable moraine layer.<\/p>\n

The depth to the rock was between elevation -4 and -15. The groundwater was at level 2.<\/p>\n

Problem statement<\/strong><\/p>\n

In consideration of nearby buildings, it was necessary to have a tight design<\/p>\n

the construction pit. On the basis of trial framing, brace-anchored piling to rock was chosen as<\/p>\n

primary safety construction of the construction pit. However, it proved difficult to hit<\/p>\n

piled down to the mountain, and only a few pile needles reached down.<\/p>\n

Solution<\/p>\n

When it was revealed that Stgt. 4 did not stand on mountains, jet piles were chosen both as load carriers<\/p>\n

construction solution for Stgt. 4 and as a seal in the moraines overfjell. For sealing sheet piling<\/p>\n

it chose jet piles as the sealing method. The piles were installed 60cm down into the rock and up 1.0m above<\/p>\n

sheet piling.<\/p>\n

Pore \u200b\u200bpressure and settlement measurements<\/p>\n

Four pore pressure measurements were installed prior to excavation below the groundwater level. After<\/p>\n

each time it was excavated, measured pore pressure converted to rise height showed a level corresponding to<\/p>\n

medium excavation level. This also confirmed that there was a lot of inflow into the construction pit<\/p>\n

insignificant. Stortingsgata 4 was followed up with continuous settlement measurements. No<\/p>\n

sentences were recorded, neither during the jet pile works nor later during excavation of<\/p>\n

the construction pit. However, the flag factory in Prestegata put up to 43mm in connection<\/p>\n

with reimbursement with steel core piles.<\/p>\n

Conclusion<\/p>\n

Despite trial fitting of piles to rock, problems can arise. Alternative solutions must<\/p>\n

considered in the design phase. Jet piles can be used in combination with sealing and<\/p>\n

structural elements.<\/p>\n","protected":false},"featured_media":2523,"parent":0,"menu_order":1,"template":"","meta":{"_links_to":"","_links_to_target":""},"class_list":["post-2519","referanser","type-referanser","status-publish","hentry","reference-type-dolomiti-refferanser-eng"],"acf":{"subtitle":"Referanse","title":"Stortingsgata 6, Oslo JETGRUNN","text":"","buttons":null,"image":"","video":"","focus_point":"end","style":"dark","type":"full","overlay_opacity":60,"enable_animation":false,"lottie":"","animation_opacity":60},"_links":{"self":[{"href":"https:\/\/seabrokers.no\/fundamentering\/en\/wp-json\/wp\/v2\/referanser\/2519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seabrokers.no\/fundamentering\/en\/wp-json\/wp\/v2\/referanser"}],"about":[{"href":"https:\/\/seabrokers.no\/fundamentering\/en\/wp-json\/wp\/v2\/types\/referanser"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/seabrokers.no\/fundamentering\/en\/wp-json\/wp\/v2\/media\/2523"}],"wp:attachment":[{"href":"https:\/\/seabrokers.no\/fundamentering\/en\/wp-json\/wp\/v2\/media?parent=2519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}