Foundation treatment of silty soil
The treatment methods of silty soil mainly include :(1) vacuum preloading method; (2) Connection between heap load and vacuum preloading; (3) sand well foundation drainage consolidation method; (4) mixing pile foundation reinforcement method; (5) rotary jet grouting pile foundation reinforcement method;
Details >Foundation pit enclosure and support method under soft soil condition
The supporting mode of foundation pit in soft stratum should be determined according to the excavation depth and surrounding environment. In the case of complex environment, it is not appropriate to adopt the way of slope excavation, and it is necessary to set up soil retaining structure and water stop curtain. The common support method is mainly pile row support + inner support.
Details >Several forms of foundation pit support
The main forms of foundation pit support are as follows :(1) underground continuous wall (cast-in-place reinforced concrete wall excavated by sink excavation) + internal support (fish-belly foundation pit steel support); (2) Enclosure structure of soft occluding row pile (occluding reinforced concrete pile and soil-cement pile) + internal support (steel support of fish-belly foundation pit);
Details >Several forms of retaining pile (wall) of foundation pit
The main forms of foundation pit pile (wall) are as follows :(1) underground continuous wall (cast-in-place reinforced concrete wall excavated by sunken groove); (2) Enclosure structure of soft occluding row pile (occluding reinforced concrete pile and cement soil pile); (3) hard occluding row pile enclosure structure (reinforced concrete pile and plain concrete pile are continuously occluded together);
Details >Foundation pit support with surrounding buildings
When there are buildings around, for the protection of buildings, it is necessary to have higher requirements for the safety level of foundation pit support, which is set according to the type of surrounding buildings. The undisturbed influence of the construction process on the surrounding buildings can be reduced by using the undisturbed concrete pile as the foundation pit enclosure structure. Using PRESTRESSED FISH-BELLY STEEL BRACE AS HORIZONTAL SUPPORT CAN INCREASE THE CONSTRUCTION SPEED TO THE MAXIMUM EXTENT, THEREBY REDUCING THE DEFORMATION OF THE FOUNDATION PIT AND ENSURING THE SAFETY OF THE SURROUNDING BUILDINGS.
Details >There are two main types of occlusal piles: one is soft occlusal pile, which is the occlusal of reinforced concrete pile and cement soil pile; The other is hard bite pile, which is the bite of reinforced concrete pile and plain concrete pile.
Details >Application of prestressed fish-belly steel bracing in deep foundation pit engineering
In the deep foundation pit supporting, the prestressed fish-belly foundation pit steel support is used, the span is generally between 40 and 50 meters, the maximum can reach more than 60 meters, and the width of the foundation pit can reach 200 meters. At present, the maximum depth of the foundation pit supported by prestressed fish-belly steel is 29 meters, and the length is more than 500 meters.
Details >Foundation treatment technology of high-energy dynamic compaction
Dynamic compaction foundation treatment technology, it is the use of special machinery or crane will rammer mentioned high, so that its free fall, to the foundation with impact and vibration energy, the foundation soil tamped ground treatment method.
Details >Ultra-high pressure rotary jet grouting pile and micro-disturbance rotary jet grouting pile
High-pressure jet grouting is a kind of high-pressure jet grouting method. The grouting pipe with a special nozzle is inserted into the designed soil depth, and then the cement slurry is shot out of the nozzle in the form of high-pressure jet to impact and cut the soil. The soil and cement slurry are stirred to form a mixed slurry, which then forms a continuous lap cement plus solid.
Details >RCP foundation treatment technology
Prefabricated PILE AND CEMENT-SOIL MIXING REINFORCEMENT FOUNDATION treatment technology, through the CEMent-soil pile, strengthen the weak foundation, concentrically inserted prefabricated pile, long prefabricated pile can effectively control the foundation settlement, through the mixing pile reinforcement and prefabricated pile sedimentation control to achieve ideal foundation reinforcement effect, reduce the foundation treatment cost.
Details >Hong Kong airport is the biggest challenges facing the third runway construction aspect, before the project starts, sea DCM (mixing pile), land DCM (mixing pile), PVD (drain) in the sea, land gravel pile foundation treatment technology such as are for Japan, South Korea, the monopoly of international advanced technology, before and after the tender, the foreign counterparts enterprises of our country executes strict technology blockade. For this reason, the strong foundation has carried on the thorough research. After more than two years of continuous fighting day and night, countless scientific research, testing and adjustment, we have overcome the difficulties of equipment manufacturing and construction technology of PVD (drainage board) engineering ship, DCM (mixing pile) engineering ship, onshore gravel pile machine, and onshore DCM pile machine, and successfully mastered the core technology.