The vacuum probe is buried with a drilling rig drilled at the designed hole position to the design elevation of the vacuum measurement point. The prepared vacuum probe is placed in the hole, and the vacuum probe is covered with sand and then the processed expansion soil ball is filled into the hole. To the second vacuum measurement point, place a second vacuum probe and repeat as above to complete a multi-probe arrangement. If there is too much vacuum probe buried in a hole, the hole can be buried. The vacuum probe can be connected to the outside world with a 1.5-2.0 cm diameter polyethylene catheter or a vacuum high pressure hose connected to the vacuum pressure gauge. In order to prevent uneven settlement of soft soil layers, hoses can be connected between polyethylene pipes. Polyethylene catheters at the outlet of the film were used to achieve the sealing by using the film-bonding method 0 or the flange connection method 0. The sealing effect of the latter was better than that of the former. Membrane pipeline more dense, using a film box to reduce the number of holes out of the film. Because this project is a vacuum combined with surcharge preloading to reinforce the soft foundation, in order to avoid damaging the vacuum system due to the filling construction, all the vacuum conduits are led from the sand mat to the vacuum table after the membrane at the slope to make the protection pier or Introduce the observation room.

Remaining detection hole burial according to design requirements / every 50m hole 0, / detection frequency is once a month 0 requirements set the reserved detection hole, in the K25 260 right shoulder, K25 300 road center, K25 350 left shoulder There are 4 inspection holes left at the center of K25 400 Road and a total of 16 reserved holes for this project. The reserved hole is used for setting up the reserved detection hole. The hole should be selected and drilled on the foundation (this detection hole is called the initial detection hole) to get the vacuum preload before the foundation raw data for vacuum The ground pressure data after preloading are compared to determine the growth of ground strength. It is advisable to set the reserved hole around the initial detection hole (R=1.5m), but considering the convenience of filling and rolling quality, it can be arranged in strips, and the reserved holes are placed at both ends of the initial hole (hole spacing is 1.0 m) It is perpendicular to the center line of the roadbed, and the reserved hole is set at the center of the adjacent three sand wells. The filter tube is buried in the sand cushion and the width of the excavation bottom is 10) 15cm. The inverted trapezoidal groove with a height of 40cm requires the same height at the bottom of the groove. When the groove is excavated, the head of the sand well shall not be damaged. The processed filter tubes were transported to the construction site, and the main branch filter tubes were arranged according to the design requirements. The filter tubes were connected by three-way reducing and four-way connection. Treatment of voids around the sand well Because the casing diameter of the sand well construction in the bag is larger than the diameter of the sand bag by about 2.0-2.5 cm, there is a certain gap between the sand well and the pipe wall, especially when the original ground is a hard shell foundation. The gap is especially large. According to the construction experience, the gap between the sand and the soil must be filled and compacted. Otherwise, the film will be broken when the vacuum is applied around the sand well.

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