List of major hazards in the project?

The list of major hazards is very important, and the important contents listed in the list can better handle every detail in the construction. Zhong Da Consulting Company will introduce you to the list of major hazards in the project.

1, before the foundation pit excavation, study the drawings, conduct on-site investigation, and master the pipeline embedding situation; 2. Before mechanical equipment excavation, manual excavation shall be carried out as required; 3. Arrange pipeline supervision during soil excavation; 4. Formulate emergency preparedness and response plans for road pipeline accidents, and take pipeline reinforcement measures when necessary.

1. Dock with the pipeline property right unit before construction, listen to the relevant suggestions on pipeline protection and implement the suggested measures; 2. Set monitoring points around the pipeline, organize regular monitoring, and guide on-site construction; 3. Formulate emergency preparedness and response plans for road pipeline accidents, and take pipeline reinforcement measures when necessary.

1, strengthen the construction management, and carry out the construction in strict accordance with the special safety construction scheme; Influence of foundation pit excavation near Dongfu Station on military communication pipeline During the excavation, the deformation or overload of the steel supporting structure of the foundation pit was not carried out in time, the basement was soaked by accumulated water, and the piles around the foundation pit collapsed due to other injuries (pipeline damage). 2. After the completion of each supporting system, the next excavation can only be carried out after the acceptance.

1, prepare special construction scheme as required, and do a good job of scheme demonstration and approval, and carry out construction in strict accordance with the scheme.

2. Follow the principle of "slotting support, supporting while excavating, layered excavation and no over-excavation", make supports, anchor cables and rock anchors in time, and check the groove and seal the bottom in time after excavation.

3. Dewatering excavation shall be carried out in the pit, drainage ditches and sump pits shall be set in the foundation pit, intercepting ditches and retaining walls shall be set outside the pit, and the accumulated water at the bottom of the pit shall be pumped out in time.

List of major hazards Description and control measures of major hazards in sub-projects and operation activities that may be caused by subway stations, mine tunnels and shield tunnels.

Standardize the foundation pit structure and pit bottom monitoring, reserve a certain amount of earthwork on site, and backfill back pressure immediately when the pit bottom uplift exceeds the limit; The supporting structure of foundation pit is deformed or overloaded, the basement is soaked by accumulated water, and the earthwork around the foundation pit is overloaded. 5. Reasonably excavate in layers to ensure that the excavation machinery has enough working clearance and swing space. The corners are excavated manually, and technicians will monitor the excavation process. If the supporting structure is damaged, it must be repaired immediately;

6. Stacking is not allowed within the range of 1.5m around the foundation pit, and it is limited to within 3m. Heavy vehicles are not allowed to pass by the pit, and a sign "Heavy vehicles are not allowed to approach the pit" is set at the edge of the enclosure.

7. Prepare the emergency preparation and response plan for the collapse accident of deep foundation pit.

Uneven adhesion or deformation damage of steel support plate of excavation slope; Steel-supported anti-falling wire rope is not tightened or not firmly set; There is no protective railing and dense mesh safety net at the edge of the main foundation pit for earthwork excavation.

1, slope excavation shall be carried out in strict accordance with the approved scheme; collapse

2. In case of abnormal weather, the slope of open-cut foundation pit is covered with dense mesh safety net.

1, when setting the steel support, make sure that the jack-up is firm and the pad is close to the steel purlin;

2. Regularly arrange special personnel to check the reinforcement of steel supports;

1, steel support anti-falling wire rope must be set firmly, tightened and fastened, and organize personnel to check it regularly;

2. Set the steel purlin tripod in strict accordance with the scheme requirements, and ensure that it is firmly fixed.

1, according to the requirements of the scheme, set up a limb safety protection railing and hang a dense mesh safety net;

2. Set a safe passage at the passage position of the top bracket;

3. Set the safe passage of the upper and lower foundation pits and hang various safety warning signs; List of major hazards caused by foundation pit collapse, object collapse and the influence of objects on subway stations, mine tunnels and shield tunnels; Description and control measures of major hazard sources in sub-project operation activities.

4, night construction to ensure sufficient lighting brightness;

1, strengthen the monitoring of supporting axial force and guide the site construction; When the axial force of the support in the foundation pit exceeds the limit, dangerous deformation and collapse (instability of the support system) will occur.

2. In strict accordance with the principle of "slotting support, supporting while excavating, layered excavation and no over-excavation", support, anchor cable and rock anchor shall be constructed in time, and the trench shall be inspected and sealed in time after excavation.

3. Prepare the emergency preparation and response plan for the collapse accident of deep foundation pit, and take corresponding reinforcement measures when necessary.

1, the dewatering construction is completed, and the excavation can only be carried out after the water level drops below the elevation of layered excavation 1m; Dewatering construction failed to achieve the expected effect or the anchor and shotcrete support of foundation pit side wall was not timely. 2. When mud and water gush out from the foundation pit wall, according to the water inflow, the initial water stop or horizontal grouting is used to spray anchor to stop the leakage. If mud and water gush cause cavities behind the retaining piles, the cavities must be filled with grouting;

3. When mud and water gush from the bottom of the pit, immediately stop the excavation and strengthen the precipitation. If it is difficult to control, backfill the back pressure immediately;

4. Excavate in layers to the planned elevation, and immediately close the side wall of the foundation pit with shotcrete and anchor support;

5. When the foundation pit is excavated to the elevation of the pit bottom, timely check the groove and use it as the back cover cushion.

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