Special engineering ship for immersed tube tunnel foundation sand filling

Abstract

The invention discloses a special engineering ship for immersed tube tunnel foundation sand filling. The special engineering ship for immersed tube tunnel foundation sand filling comprises a hull, anda monitoring system, a material mixing and conveying system and a sand pressing system are correspondingly arranged on the hull. According to the special engineering ship for immersed tube tunnel foundation sand filling, by arranging the monitoring system, the material mixing and conveying system and the sand pressing system, a difficult position of sand and ship separation and low efficiency inan immersed tube tunnel sand filling process in the past is changed, a sand filling effect monitoring system is additionally arranged, sand filling construction continuous proportioning is realized, pressure, flow and a water and sand ratio are effectively monitored, sand filling quality is ensured, and the sand filling work efficiency is improved by more than 50%.

Description

technical field [0001] The invention relates to the technical field of sand filling in pipe sections of immersed tube tunnels, in particular to an engineering ship specially used for sand filling in the foundation of immersed tube tunnels. Background technique [0002] Immersed tube tunnel is an underwater tunnel built through the processes of prefabrication in dock, towing and floating, sinking and docking, foundation treatment, backfilling and covering. The top cover is shallow, the tunnel length is short, and the connection with the roads on both sides of the water area is more flexible, which can greatly save land resources in the central urban area. It is one of the main methods for cities to build underwater tunnels in inland rivers. However, inland rivers often have narrow channels, shallow water depth, high flow velocity, intensive shipping, and large water level drop, which brings great difficulties to the floating and sinking of pipe sections, and even affects cons...

AI Technical Summary

Problems solved by technology

However, inland rivers often have narrow channels, shallow water depth, high flow velocity, intensive shipping, and large water level drop, which brings great difficulties to the floating and sinking of pipe sections, and even affects construction safety. Use of large-scale offshore floating and sinking equipment

More than 80% of the immersed tube tunnels use sand filling cushion to eliminate the harmful gaps at the bottom of the pipe joint and the bottom of the foundation tank after the pipe section is laid, but the traditional sand filling method also has the following problems: 1. The sand material is separated from the sand filling ship , sand filling is discontinuous, resulting in low construction efficiency, long construction time, and increased difficulty in selecting the window period of the immersed tube scheme; 2. The control of key indicators such as sand filling pressure and sand filling volume in sand filling construction is mainly carried out based on experience

3. After the construction is completed, the shape and filling effect of the sand tray are unknown, and there is no effective detection method

4. It is difficult to seal the sand hole in the later stage, and it is easy to cause structural water leakage

Since the sand filling quality cannot be accurately grasped, after the sand filling is completed, the later settlement of the pipe section is often difficult to predict (calculate), which will lead to uneven settlement between the pipe sections of the immersed tunnel, which will cause the risk of water leakage at the joints of the pipe sections and endanger the safety of tunnel operation

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