B.
Cuplock Scaffolding Bottom Cup
2.
Operation in the pit (1) the upper opening of pile holes such as steel pipe piles and bored piles, the upper opening of cup-shaped and strip foundations, unfilled pits, Manholes, skylights, floor doors, etc.
Up and down channels of deep foundation pit 5.
It is strictly prohibited to cut off the slope toe first and over excavate.
When the deformation exceeds relevant standards or the change rate of monitoring results is large, the observation times shall be increased.
Foundation pit drainage measures foundation pit dewatering measures foundation pit dewatering measures 3.
2.
Monitoring report during the monitoring of foundation pit excavation, the daily monitoring report and periodic monitoring report shall be submitted according to the design requirements.
Drainage measures (1) common groundwater control methods include open drainage of water collection, precipitation, water interception and reinjection, which can be used alone or in combination.
Cross operation in foundation pit (1) suspended operation when various types of work carry out vertical cross operation up and down, the position of the lower operation shall be outside the radius of the possible falling range of the upper height, and a safety protective layer shall be set（ 2) As the above construction may fall objects or the passage within the rotation range of the crane handle, a double-layer protective shed to prevent falling objects must be set up within the affected range.
Monitoring alarm the monitoring alarm value of foundation pit monitoring items shall be determined according to the relevant specifications of monitoring objects and the design requirements of supporting structures.
1、 Foundation pit excavation 1.
3.
5.
Foundation pit excavation II.
point distribution requirements: for level III foundation pit with excavation depth not exceeding 7m, the spacing of monitoring points shall not be greater than 20m; For class I and II foundation pits with excavation depth of more than 7m, the distance between monitoring points shall not be greater than 10m; Each typical slope section shall have at least 3 monitoring points.
Monitoring cycle (1) the initial value of monitoring items shall be measured before foundation pit excavation, and shall not be less than twice（ 2) The time interval of each monitoring can be determined according to the construction process.
Earth excavation (1) earth construction machinery shall be inspected and accepted by relevant departments before entering the site for operation.
4.
Layout of monitoring points (1) the layout of monitoring points shall meet the monitoring requirements, and the objects to be protected within 1 ~ 2 times the excavation depth outside the edge of the foundation pit shall be taken as the monitoring objects（ 2) The number of displacement observation datum points shall not be less than two, and shall be set outside the influence range（ 3) Horizontal and vertical displacement monitoring shall be carried out for deep foundation pit works, and the following requirements shall be met: A.
Up and down passage (1) during foundation pit operation, a passage for operators to go up and down must be set, and operators are not allowed to climb temporary facilities（ 2) The setting of channels must be firm and reliable in structure, and the quantity and position shall meet relevant safety requirements.
Monitoring items: the monitoring items of foundation pit engineering can be selected according to the safety level of foundation pit side wall (divided into level I, II and III), specifically divided into: support structure displacement; Deformation of surrounding buildings and underground pipelines; groundwater level; Internal force of pile and wall; Anchor tension; Supporting axial force; Column deformation; Vertical displacement of ground layers; Lateral pressure on the support structure interface.
Operators shall work with certificates and abide by safety technical operation procedures（ 2) During mechanical excavation of earthwork, operators shall not enter the radius of mechanical operation for pit bottom cleaning or slope making（ 3) The excavation sequence from top to bottom shall be followed during construction.
Edge protection of Deep Foundation Pit 2.
Foundation pit monitoring points 3.
Vertical operation in the foundation pit vertical operation in the foundation pit shall not be operated in the same vertical direction when various types of work carry out vertical crossing operation up and down.
At the end of the project, a complete monitoring summary report shall be submitted, which shall include: (1) project overview（ 2) Plan and elevation layout of monitoring items and measuring points（ 3) Adopt instruments, equipment and monitoring methods（ 4) Monitoring data processing method and monitoring result process curve（ 5) Evaluation of monitoring results.
The monitoring scheme shall include monitoring purpose, monitoring items, monitoring alarm values, monitoring methods and accuracy requirements, layout of monitoring points, monitoring cycle, process management and recording system, information feedback system, etc.
Pit side load (1) if various building materials are stacked near the foundation pit, slope and foundation pile hole, they shall be stacked according to the specified distance; The distance between various construction machinery and the edge of foundation pit, slope and foundation pile hole shall be determined according to the equipment weight, support and soil conditions of foundation pit, slope and foundation pile, and the surcharge shall not exceed the design provisions（ 2) When the distance between various construction machinery construction and foundation pit and slope is less than the specified, reinforcement measures shall be taken for foundation pit support and ground within the operation scope of construction machinery.
There are no reliable safety facilities under special circumstances.
Monitoring scheme before foundation pit excavation, a systematic excavation monitoring scheme shall be formulated.
When suspended operation in foundation pit, it shall have a firm foothold and set up protective facilities.
Layout of foundation pit monitoring points 4.
Common groundwater control methods include open drainage, well point precipitation, artesian deep well drainage, etc（ 2) If dewatering outside the pit is adopted for the construction of deep foundation pit, measures must be taken to prevent dangerous settlement of adjacent buildings.
Horizontal displacement monitoring includes displacement amount, displacement rate and direction.
In case of accident signs, continuous monitoring shall be carried out（ 3) The horizontal and vertical displacement monitoring of deep foundation pit engineering shall be carried out once before construction, and the monitoring shall not be less than once a day during the construction period; If it is found that the deformation of the monitored object develops rapidly during the monitoring, the monitoring times shall be increased.
Foundation pit monitoring 1.
When someone works in the pit, someone must be supervised above（ 5) General lighting, local lighting or mixed lighting shall be provided in the working places in pits, holes and wells, and the power supply voltage shall be safe according to the working environment.
Cross operation in the foundation pit 4.
Suspended operation in foundation pit.
When the maximum displacement of the enclosure or the maximum ground settlement exceeds the following values, the monitoring times shall be increased: Level I foundation pit: 5mm, 3mm; Secondary foundation pit: 8mm, 6mm; Grade III foundation pit: 10mm, 10mm.
shall be provided with stable covers according to the hole protection（ 2) In addition to protective facilities and safety signs, red light warning shall be set at night at all kinds of openings and pits near the passageway of the construction site（ 3) Safety ladders that meet the requirements and are firmly fixed shall be set for operation in the pit.
Edge protection (1) foundation pit construction must be carried out as required, and the specific edge protection requirements shall be implemented in accordance with the requirements of the chapter “three treasures and four openings”（ 2) For the construction of foundation pit with excavation depth of more than 2m, mesh safety net protection must be added on the basis of railing protection.
6.
3、 Working environment of Deep Foundation Pit 1.
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Drainage measures must be set around the working pit or at the pit bottom, and ventilation facilities shall be set if necessary（ 4) The pit wall must be provided with firm and reliable support measures according to the scheme.
