Background information:
A construction unit undertook the construction task of a contract section of a expressway. The starting and ending stations of the contract section are K9 + 060 K14 + 270, and a large number of paddy fields are developed along the highway, and the water system is developed, and there are a large number of soft soil foundations, of which the thickness of soft soil near K11 + 350 is 45~8.0m, the design uses cement powder mixing pile for processing, the cement content is 14%, the pile diameter is 50cm, the pile spacing is 150cm, it is arranged in a regular triangle, the pile top foundation is provided with a gravel cushion, the thickness is 30cm, and there is a central pile number K13 + 050 bridge, the abutment behind the fill is higher, the load is larger, and the backfill of the platform needs to be carried out according to the requirements of the specification. Before the start of the project, the construction unit prepared the implementation of the construction organization design, determined the construction method of the main sub-project, construction machinery and equipment, etc., formulated the schedule, and approved by the supervising engineer, the double code network plan is shown in Figure 5.
The following events occurred during the construction process:
Event 1: Before the construction of the cement powder mixing pile, the construction unit carried out a column test and determined the construction process parameters of the cement powder mixing pile that met the design injection requirements, including drilling speed, mixing speed, etc. During the construction process, the construction unit conducts quality inspection in strict accordance with the requirements of the specification, and the measured items include verticality, bearing capacity, pile length, pile diameter, pile spacing, etc. The inspection found that some piles were sinking, and the amount of subsidence was 12~2.0m, the construction unit took measures to deal with the sinking of the pile according to the requirements of the specification.
Event 2: In the construction organization design, the technical scheme of the abutment back backfill is as follows: the platform back filler is made of sand and gravel or two ash soil, from the platform body, along the route direction, the length of the fill is not less than the height of the abutment at the top surface;The cone slope filling and the platform back filling are carried out at the same time, and the small machinery is used for compaction, and the degree of compaction is not less than 94%;The backfill of the back of the table is carried out when the strength of the structure reaches the design strength of 65 or more.
Event 3: During the performance of the contract, the following situations have occurred that may affect the construction period:
Due to the design change, the quantity of work (b) was increased from 50,000 m3 to 60,000 m3;
After the completion of work (d), the owner refers to adding an additional work before work (g) and it will take 30 days to complete the additional works.
Due to the unqualified inspection of one of the main materials of the owner's **, resulting in a delay of 40 days for the start time of work (i), the construction unit submitted a construction claim to the owner for the above three situations according to the contract.
Question] 1 Calculate the duration of the network plan and point out the key lines.
2. In the first event, what other process parameters should be determined by the construction unit in the pile test?Supplement the quality inspection and measurement items.
3.Write down the measures to be taken to deal with the pile sinking in event 1.
4.Judge whether the technical plan of the construction unit in the second incident is accurate one by oneIf the correct technical solution is not written correctly.
5 What are the claimable days in each case of Event 3?How many days is the total duration claim?First Class Constructor