Construction measures to ensure the progress of the consolidation grouting project
Consolidation grouting of the dam foundation has a large scale, a large amount of work, complex processes, high technical requirements, tight construction schedule, and large interference. Consolidation grouting The construction is interspersed with other processes such as bedrock cleaning, formwork erection, pouring, etc. It is necessary to ensure that the concrete pouring of the dam is not affected, and at the same time the quality of the consolidation grouting and the progress of the project are ensured. In line with the principle of "taking into account all parties and ensuring quality", the consolidation grouting project focuses on construction technology management, including mechanical equipment matching and layout, and engineering Progress, material planning, technical measures, project quality, construction safety operations and labor organization management. In accordance with the overall construction progress plan of the project and the owner's instructions and requirements, various effective measures will be taken to ensure the progress of the consolidation grouting project is achieved.
(1) Process coordination
Adhere to construction scheduling as the center, unified command and unified dispatch, coordinate the work of various construction parts in a timely manner, reduce interference, and the on-site management organization can timely and accurately grasp the production dynamics , speed up the construction progress.
Focus on key projects, take into account other projects, and try to shorten the construction time of major processes and key lines.
(2) Use advanced and efficient drilling and grouting construction equipment
① To construct consolidation grouting drilling with special requirements, use the XY-2PC rotary drilling rig produced by Chongqing Exploration Machinery Factory .
② For consolidation grouting drilling, the YG-30A engineering drilling rig produced by Wuxi Shuangfan is mainly used, which is easy to install and relocate, and is a fully hydraulically driven drilling rig. The drilling efficiency is high, with an average efficiency of 15m/h, and it is suitable for construction sites in slope dam sections.
Main technical parameters: drilling diameter φ50mm, drilling depth 50m, drilling inclination angle 0~360°, motor power 15kW, drilling rig weight about 550kg, external dimensions length × width × height (2700 × 1150 ×1400) mm.
In order to facilitate construction and spare light equipment, the YQ100D down-the-hole drilling rig produced by Wuxi Shuangfan was selected. It is a rock drilling equipment that is light in weight and easy to transport and move. The main technical parameters: drilling diameter φ76mm , drilling depth is 30m, air consumption is 160~200L/S.
Japanese Furukawa HCR1200-ED hydraulic drilling rig is used for consolidation drilling of riverbed dam sections.
③The grouting pump is the SGB6-10 grouting pump produced by Hangzhou Exploration Machinery Factory. The main technical parameters are: flow rate 100L/min, pressure 10Mpa.
Chemical grouting pump: Choose the HGB-2 type produced by Hangzhou Prospecting Machinery Factory or the SNS-1016 type produced by Zhongnan Machinery Factory.
④Grouting plug: Use top-down segmented grouting or bottom-up segmented grouting method. The grouting plug is a DYS series split capsule grouting plug, which can withstand 6-10Mpa working pressure. The grout plug is used in conjunction with a soft hose (grout pipe) wrapped around the wheel and lowered into the hole, which can greatly improve work efficiency and reduce labor intensity.
⑤ Automatic grouting recorder, automatic grouting recorder GJY-Ⅳ three-parameter automatic grouting recorder produced by Changke Academy.
⑥Lifting observation record, the LHOZB intelligent displacement measurement and control instrument observation system is a device independently developed by China Gezhouba Group Foundation Treatment Engineering Co., Ltd. It has obtained a national patent and can effectively record the lifting deformation during grouting. Automatically monitor, record and alarm situations.
⑦Continuously optimize the construction plan and equipment configuration to improve equipment integrity, utilization and efficient operation.
(3) Formulate a reasonable construction plan
Seize the consolidation grouting construction of key dam sections that control the construction period. The key dam sections to start construction are 23#~27# dam sections, followed by Consolidation grouting on slope sections. In terms of construction organization, we will strengthen the allocation of production factors and form a systematic operation line for slurry preparation and supply, drilling, grouting, and lifting observation to speed up the construction progress.
(4) Construction site layout measures
①Drilling site layout
The drilling site layout is mainly the type of drilling rig platform. The layout is more complicated when constructing on a concrete plane. Simple, when the heavy grouting without cover is used to consolidate the drilling grouting on the slope, it is planned to set up a large-area full-floor platform and scaffolding. The scaffolding is set up with φ50 steel pipes, and anchor holes are drilled on the rock surface to fix the racks. The operating platform uses bamboo picks. Boards or 5cm thick planks are used for laying.
② Arrangement of simple centralized slurry supply station on site
When this project enters the site for construction, the consolidation grouting construction of the riverbed dam section must be carried out immediately, because it is planned to be arranged at an elevation of 1130m on the left bank The centralized slurry supply building on the horse road did not have time to form a pulp making and supply system. In order to meet the needs of cement grouting and grouting, a simple mobile pulping station is built at an appropriate location according to the actual conditions of the construction site. The pulping station consists of a ZJ-800 high-speed pulping machine, a 1m3 low-speed mixer and a BW250/50 pulping pump. Continuous pulp supply capacity is 200L/min. According to the grouting intensity and the equipment capacity of the grouting station, a sufficient simple grouting system should be configured to ensure the required grouting amount.
③Mobile grouting machine room
In the construction process of consolidation grouting using the concrete interval period, it is often necessary to remove the parts occupied by the consolidation grouting. The grouting equipment is relocated frequently. In order to reduce For the number of relocations, a movable container grouting room is used. The grouting room is designed as a unit: grouting machine, mixer, and cement to form a machine room. It is mobile, flexible, has centralized equipment, and can be placed in any suitable location.
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