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Willing to cooperate with your company happy, mutually beneficial and win-win. xxx water pumping station excavation works construction program xxx plugging water diversion project, due August 20, 2013 in the northwest corner of serious Pit gushing phenomenon, and seriously affected the construction schedule the next step, according to experts on-site analysis and October 19, 2013, at the "pit pumping stations plugging the topic" meeting instructions, using the following construction scheme plugging construction: one, analysis gushing reasons: 1) because of the geological conditions of factors and high-rise building at the northwest corner of the foundation adjacent to, and in accordance with the geological data when punching pile and jet grouting pile sealing primer hole appears to reflect, pit there riprap layer, the old concrete foundation, wood piles and other debris, resulting in complex geological conditions where, in the northwest corner appear at the bottom of a large pit gushing phenomenon (gushing clear). Since the site is expected to be in the process of sealing pile encounter greater obstacles encountered in underground culverts or actions. 2), sealing curtain measures factor According to "XXX water pumping station excavation engineering design review comments of the letter", Annex 1 states: "The pit near the Pearl River, groundwater dynamic state, and there are more venues construction waste and other underground obstructions, sealing pile construction quality is difficult to guarantee. "visible impact force majeure sealing underground there is a big pile quality, design failed to consider in detail the local underground rock miscellaneous fill the bottom of the pile wall changes Lap adverse effects and construction difficulties arising. It works as a single row of Churning Pile Cofferdam not ideal. According to the project site construction west and south sides of the sealing effect analysis, two rows of jet grouting pile fortified sealing effect is obvious, but in the pit to the east, north, and also appeared individual drain pipe leakage, analyze also the main reason again ground conditions exist many obstacles, seriously affecting the quality of construction sealing pile actions. 3) environmental factors as a result of the pumping station is located along the road at the intersection of Bay Bridge and close to the foundation, excavation around the Bay Bridge traffic live load vibration transmission suffer greater stress is caused by excavation sidewalls gushing stream direct soil the reason. Second, the problem occurs after emergency treatment gushing phenomenon according to January 18, 2010 excavation in the northwest corner, the premise of ensuring the safety of the surrounding buildings, the use of pressure to fill our straw, sand bag, sand bag filling pressure surface C30 concrete, as emergency treatment; and in the afternoon and the next morning to convene two units design and related discussions plugging program, and ultimately determine where the first dual hydraulic pressure grouting; machinery and personnel of our organization immediately begin rescue. Third, the construction of treatment options to select and implement (a), plugging construction program uses fill pressure, sealing, grouting method of construction. Treatment options for integrated management principles. Around three purposes. One block gushing water channel to prevent further occurrence of soil flow. Second, as soon as backfill grouting voids due to the "flow soil" caused to ensure the safety of surrounding buildings. Third, the use of a limited, limited pressure to achieve a small group of irrigation methods grout, grout curtain in a small range of water stop measures by grouting reinforcement (ie, similar to the formation of underground continuous wall), lower aquifer around foundation permeability, effectively prevent seepage pit bottom and the "Bay of sand" phenomenon. Construction process is as follows: ① filling pressure, blocking: the water in the soil serious Pit Bay area, a large empty office, filling sand bag, C30 concrete block foundation pit seepage channel. Combined with the use of C30 concrete backfill sand bag in the pit of about 50 cm from the top down to block the leakage point. ② grouting: When using a smaller bag filled with sand compaction pressure in leak outside pile excavation conducted double double liquid pressure grouting. To meet the requirements of plugging seepage, according to the design of fast-setting early strength parameters, grouting volume changes in the water-cement ratio of 1: Add 50% of the sodium silicate cement slurry water in l. Hole depth of not less than sealing the pile length, into the hole spacing 4m, filling cement mortar to find the leak, with fast plugging plugging Ling, cotton yarn will be closed, and then using pressure grouting method, plugging gushing channels. To ensure the grouting effect after pit area enclosed by sidewalls leaking filling pressure compaction, re grouting. Grouting hole depth of not less than outer sealing curtain to silt. Timeshare segment repeatedly grouting. First, the purpose of reducing silt permeability coefficient: Second growth path in order to reduce the base flow path seepage pressure. Prevent the "Bay of sand" phenomenon; the third is to effectively block the channel seepage pit. After plugging the above two steps to implement the program. Can effectively prevent the gushing water, soil and basement seepage flow, "Chung sand" phenomenon, ensure proper construction safety and the subsequent process of surrounding buildings. (Two), grouting technology program (1), drilled as required in supporting piles arranged outside the double double liquid grouting hole, row spacing 2.00m, spacing 1.0m, 2.0m stagger between the hole and seal grout piles, Overall was plum-shaped hole in the row laid pulp 12, peripheral laid grouting holes 10, 22-hole total of cloth grouting, grouting total length of 330 meters. (2), and Mix grout according to design requirements, in addition to meeting the requirements of seepage, but still should have a certain strength, the strength that grout curtain up after 1.0MPa, ash slurry water ratio of 1: 1. Cement paste and mix according to the ratio of a single test carried out in the amount of cement, cement and water glass using gray water usage ratio (3) a process of grouting, drilling and grouting within the order after the first, the first light after dark ; according to placement in batches of water construction; grouting under construction on the staging after the first press. During the construction carve two team (drilling and grouting classes classes), batch filling. 2, into the hole requirements: hole diameter 51mm, the final hole of not less than 51mm, drilling method using casing drilling Wall. Hole bottom sediment thickness is less than 0.50m, flower tube length is 1.5m ~ 3.0m, from the bottom of the hole is not greater than 0.30m. 3, grouting method: a, filling every 5 to 6 holes for a batch of grout, grout inside after the first stage outside. Each segment of the grout holes are used grout, grout segment until a later meet the design requirements to enhance flower tube is not greater than 2.0 m, and then the next grouting segment perfusion, in the flower tube upgrade requirements and have completed filling segment overlap 0.5m . b, when the grout, grout holes must deploy uniform slurry grouting pressure progressively increased from low to high, and no more than 0.4Mpa. Gray water pressure levels in the same condition stable than 3min before added to the next level pressure. Peripheral holes gray water slurry ratio 1: 1, the diffusion radius is calculated by 2.0m, the inside bore the initial ash slurry water ratio of 1: 1.1, when the grout is greater than 4000kg / m, the pressure gauge pressure is less than 0.1Mpa. c, filling end standards: according to limit pressure, limit the dual-control standards, when filling pressure (opening) up to 0.40MPa when to stop filling. Filling criteria for filling holes in unit volume midge <4L / min.m control, stable 5min, but the maximum pressure is less than 0.4MPa. Construction process is as follows: The first batch of grout drilling → → → extubation → second batch of grout grouting effect inspection four, five mechanical equipment, leak occur in the future by more than contingency plan can put an end to the north side of the reinforcement construction program Pit water leakage, but does not rule out the presence of many local underground obstructions due to the impact of the actions of pile construction quality seal water leakage, so the development of contingency plans are as follows: 1) the person responsible for the observed daily removal Pit status of water leakage phenomenon timely feedback to their superiors. 2) site configuration plugging equipment, once water leakage was found by construction program as timely closure. 3) strengthen the construction site control, setting work workspace, non-construction excavation work near machinery is prohibited. Waterproof curtain to avoid disturbance. Sixth, a safe and civilized construction, pre-construction preparations do all the work. 2, construction machinery and equipment shall not sick operation and overload operation, found irregularities should stop to check, not repaired in operation. 3, the operation of the vehicle, operating machinery placed all placed in strict construction section shall not intrude limit, non-operational vehicles, equipment parked in the grounds outside the line of the work area. 4, it is timely for the construction of waste clean Yuni (should be cleaned each class), so that the construction site clean and civilized. Plugging leaking underground corridor