沉设套管 根据设计图纸、地勘报告及探摸情况，沉设套管，套管下沉过程中应

Immersion tube <br>according to the design drawing, and exploration report Tanmo case, immersion sleeve, the sleeve should be controlled during the sinking of the vertical sleeve, the lower end of the immersed tube -17.1m level required to play set. During the sinking process of the plastic drainage board, the setting personnel should push the drainage board on site to avoid distortion of the drainage board. <br>Lifting sleeve <br>determining the drainage board design depth has been reached, the sleeve can be lifted at this time should be observed that the cannula is inserted into the hole, such as the drain does not move relative to the sleeve, then the back plate with the drainage, the sleeve is further lifted until the drainage The board is moved into the casing, and the lifting height of the casing at this time is measured, which is the amount of the drainage board returning. If the phenomenon of reentry occurs during the construction of the drainage board, the cause of the reentry should be analyzed and measures should be taken to solve it. When the <br><br>drainage plate is cut <br>to 50cm away from the soil surface at the bottom, manually cut the drainage plate from the bottom of the casing to control the exposed length of the drainage plate above 50cm. <br><br>Inspection and acceptance <br>check back with drainage board meets specifications length, if yes, fill plastic drainage plate construction records, the plate is shifted to the next place for the construction, not satisfied, at 30cm from the plate at the position of the drain plate on again, Repeat the above construction steps. And make the construction records one by one and truthfully, and sign and confirm after the daily construction.

Sink the casing <br>According to the design drawings, geo-survey report and exploration situation, the casing, casing subsidence process should control the verticality of the casing, the lower end of the sink pipe should be set to -17.1m elevation. In the process of the plastic drainage plate sinking, the staff should be on-site smooth inge drainage plate, to avoid the phenomenon of distortion of the drainboard.<br>Lifting casing <br>After determining that the drainage plate has reached the design depth, the casing can be lifted, at this time should observe the casing insertion hole, such as the drainboard relative to the casing does not move, then the drainboard backband, continue to lift the casing, until the drainboard moved into the casing, measure the lifting height of the casing at this time, that is, the drainboard back band volume. In the course of drainage plate construction, if the phenomenon of tempering occurs, the causeof the belt should be analyzed and measures should be taken to solve it.<br><br>Cut off the drain board<br>When the lift is raised to the bottom to leave the surface 50cm, the drainboard is manually cut off from the bottom of the casing, so that the drain board exposed length is controlled at more than 50cm.<br><br>Check acceptance <br>Check whether the length of the drainage plate backband meets the specification requirements, if satisfied, fill in the plastic drainage board construction record, shift to the next plate for construction, if not satisfied, from the plate 30cm to re-set the drainboard, repeat the above construction steps. And root by root, truthfully do a good job of construction records, daily after the completion of the construction summary signature confirmation.

Casing sinking<br>According to the design drawings, geological exploration reports and exploration conditions, the casing shall be sunk. During the process of casing sinking, the verticality of the casing shall be controlled. The lower end of the sunk pipe shall be drilled to the elevation of -17.1m. In the process of setting the plastic drain board, the laying personnel shall smooth the drain board on site to avoid distortion of the drain board.<br>Lifting sleeve<br>After confirming that the drainage plate has reached the design depth, the casing can be lifted. At this time, the casing insertion hole shall be observed. If the drainage plate does not move with respect to the casing, it means that the drainage plate returns and continues to lift the casing until the drainage plate moves into the casing. Measure the lifting height of the casing at this time, which is the return amount of the drainage plate. In case of return belt phenomenon during the construction of drainage board, the causes of return belt shall be analyzed and measures shall be taken to solve it.<br>Cut off the drain board<br>When lifting to the bottom 50 cm away from the soil surface, manually cut off the drain plate from the bottom of the casing, so that the exposed length of the drain plate is controlled over 50 cm.<br>Inspection and acceptance<br>Check whether the return length of the drainage board meets the specification requirements. If it meets the requirements, fill in the construction record of the plastic drainage board and move it to the next board position for construction. If it does not meet the requirements, re lay the drainage board at the place 30cm away from the board position and repeat the above construction steps. The construction records shall be made one by one and truthfully, and shall be summarized and signed for confirmation after the completion of construction every day.<br>