Construction safety management of deep foundation pit engineering is a comprehensive system science, its object is the state management and control of all people, things and environment in production, so it is a dynamic management。Deep foundation pit support engineering is the difficulty and key point in the construction of high-rise building foundation engineering, its success or failure not only has a significant impact on the cost, quality and duration of the project, but also has a non-negligible impact on the surrounding environment。In order to ensure the safety of deep foundation pit construction, it is necessary to refine the safety responsibilities of the participating parties to ensure the safety and controllability of foundation pit construction。

First, analysis of common problems in deep foundation pit support engineering

Deep foundation pit support design is a basic project for the building, in the design need to have mechanics, geology and other related knowledge, according to the building construction experience and environment, to be able to design an effective management method suitable for foundation pit support engineering。

1, the quality of the retaining wall of the foundation pit is poor。

In the construction, the retaining wall of shallow foundation pit within 6m is mainly used by gravity cement mixing method, in the case of good geological conditions, this retaining wall in the foundation pit protection, as a protective structure of the foundation pit, is able to meet the requirements of construction, but also can play a certain protective role。但是，In the process of actual construction，If the geology, the construction quality of the building and the environment around the building，It will play an important role in the protection of this foundation pit，If the basic problems in construction are not fully considered，These factors often make the foundation pit offset，Lead to unnecessary problems in construction，The piles will be displaced during construction，Cause foundation pit cracking，The safe construction of the building is affected。

2. There are problems in the construction site management of foundation pit。

The design of deep foundation pit support should be based on the actual situation of the building, and there are problems in site management, which often lead to the occurrence of safe construction。Under construction，The corresponding design principles and specific construction plans must be followed，而且，In the process of construction，The construction was not carried out strictly in accordance with the construction scheme，The construction cost of foundation pit should be reduced，It affects the normal construction of foundation pit，Or lower the cost of construction，Change the design plan of the construction，Self-management of the basic design of foundation pit，Lack of supervision by the supervision department，The arbitrariness in the process of construction is relatively large，Causing the collapse of foundation pit envelope，It has an impact on the construction of enterprises。

3, in the case of lack of precipitation in the deep foundation pit construction。

In general，The deep foundation pit below 6m is in the process of construction，The base soil of the stratum is generally subject to change，It consists mainly of silty clay layers，And with a lot of thin fine sand，Geological soil layers in this case，There is often a strong penetration phenomenon，If you don't dewater the soil，And in the process of construction，It often causes the soil around the foundation pit to slide，Ultimately, the protection of the foundation pit is not safe enough，The process of construction is affected。

4, the weight of the pile load around the foundation pit affects the safety of the foundation pit。

Pile too many items around the pit，Increased pressure around the pit，Exceeding the basic load bearing capacity of the retaining wall，Easy to cause foundation pit collapse，It brings the corresponding difficulties to the construction，In general，The pile load pressure around the deep foundation pit should not exceed 10 ~ 20kN/mm pressure，If more than that，It will increase the pressure on the foundation pit，Causing landslides，It affects the safety of foundation pit，Cause damage to the construction，The progress of construction is affected。

Second, deep foundation pit construction management technology analysis

1, common deep foundation pit construction technology analysis。

The depth of deep foundation pits is generally less than 6m，In the process of construction，There are many different factors，The safety of construction is affected，For example, during the construction process，The condition of the soil layer changes，The design can not meet the requirements of construction，Support equipment encountered quicksand or soft soil，The stability of foundation pit construction is poor，New construction measures should be taken to ensure the safety of construction，In the process of construction, it is necessary to observe the amount of earthwork settlement and displacement of deep foundation pit，All surveying and mapping data in construction should be analyzed and studied，According to the actual situation, the corresponding deep foundation pit protection scheme is formulated，Ensure the safety of foundation pit construction。At the same time, there is also consideration of the seepage and drainage of deep foundation pit, which can not affect the safety around the construction foundation pit and deal with the problem of groundwater。

2, deep foundation pit construction site management analysis。

The site management of deep foundation pit should be adjusted in time according to the specific situation，The surrounding environment of deep foundation pit construction is complicated，If in the process of management，The management does not pay enough attention to the construction，The supervision system of construction is not complete，There will be corresponding difficulties in the construction，For example, during the construction process，When grouting the foundation pit，If the pressure does not meet the requirements of construction，It will seriously affect the pulling strength of the construction bolt，And then affect the safety of construction。Therefore, in the process of construction, it is necessary to conduct a comprehensive and thorough arrangement of each link of the foundation pit and a comprehensive control of each construction requirement。

Third, the effective implementation strategy of deep foundation pit safety construction management

1. Management of deep foundation pit support design。

It is necessary to formulate effective and reasonable deep foundation pit construction management scheme，Support design scheme should be able to meet the requirements of construction，It requires reliable quality and feasible technology，The principle of economic rationality，Under construction，The pressure load of foundation pit should be calculated reasonably，Select reasonable support scheme according to the actual situation，Avoid blindness in construction，The designer of construction support must master the relevant business theory knowledge effectively，Improve the effectiveness and concreteness of construction，The geological condition and hydrology condition of deep foundation pit are analyzed effectively，On the basis of combining the surrounding environment of deep foundation pit support，Effective design and management of deep foundation pit protection，The protection of foundation pit is carried out according to the detailed construction scheme。

2. Management and review of construction organization design。

How to construct deep foundation pit effectively，An effective construction organization and corresponding construction documents are needed，Ensure effective construction，Can not blindly copy other construction design scheme，The construction supervisor should carefully manage and review the construction documents，According to the actual situation of the construction site，Propose corrective measures，The construction organization is required to improve the construction plan as soon as possible，Construction shall be supervised and managed in accordance with established procedures。

3. Analysis of construction quality and safety。

In the construction, it is necessary to first do a good job of the safety management of the construction materials of the enterprise to improve the actual effect of the construction。First of all, it is necessary to conduct reasonable selection and quality supervision of the materials used in construction to ensure that the materials used can meet the requirements of construction。Construction of deep foundation pit，Start with technology and security，Select some skilled staff to carry out construction，Establish the corresponding project as the core of the safety and quality service management system，Clarify the responsibilities of the corresponding staff，Implement safety responsibility to people，In the process of deep foundation pit support construction, it is necessary to carry out a listing warning，Demonstrate appropriate safety responsibilities，It is necessary to prevent in advance or formulate corresponding emergency preventive measures。

4, the foundation pit construction management using information management technology。

In this way，It can effectively promote the timely exchange of information in the construction process，The support design of deep foundation pit should synthesize various construction requirements，Not only should you be familiar with theoretical work，Also familiar with practical work，In the process of construction，To detect and manage the deformation of the support，Through effective construction management，Improve the construction effect of deep foundation pit。In some construction process，The geological condition of the deep foundation pit changes，Causes the support of foundation pit to shift or unbalance，Can cause the building to tilt and settle，These need to achieve specific management methods and measures through specific testing，And according to the requirements of construction，Timely adjustment of deep foundation pit construction scheme，This requires timely communication of construction information，Adjust the construction plan in time，Information management can effectively improve the construction schedule，Improve construction management measures。

Iv. Conclusion

The construction design and management of deep foundation pit support is the primary work of construction，It plays an important role in the smooth construction of the project，Design of foundation pit protection，It is related to the success or failure of the whole construction，It is necessary to consider the overall situation of the foundation pit，The stability of retaining wall of foundation pit, the construction management site, the seepage of foundation pit and the collapse of foundation pit should be designed and analyzed as a whole，It is necessary to supervise and manage the management and technology of construction，To improve the overall construction efficiency of construction projects。