30results about How to "Reduce the impact of settlement" patented technology

Provided is a mined metro station hole pile construction method. The method comprises the steps of whole support system construction and main body second lining construction; the whole support system construction step comprises the substeps that by utilizing air shafts at the two ends of the station as temporary working wells, four pilot tunnels are transversely dug through a positive step method; upper pilot tunnel side pile and middle column hole digging pile construction is conducted, bored piles are constructed inside an upper layer side pilot tunnel at intervals, and artificial hole digging piles are constructed inside an upper layer middle pilot tunnel at intervals; lower layer pilot tunnel bottom longitudinal beam construction is conducted; upper layer pilot tunnel steel pipe column construction is conducted; side pile crown beam construction is conducted; top longitudinal beam construction is conducted; top arch initial supporting structure construction is conducted; the main body second lining construction step comprises the substeps that soil body excavation is conducted, and station top plate second lining structure construction is conducted; when a soil body is dug to the bottom of a middle plate, middle plate and middle longitudinal beam construction is conducted; when a soil body is dug to the bottom of a base plate, the waterproof base plate is laid, and structure base plate construction is conducted; lower portion side wall construction is conducted when the base plate reaches the set intensity.

The invention provides a simulation experiment device and method for secondary crushing and fluidization of submarine gas hydrate. The simulation experiment device for the secondary crushing and fluidization comprises a secondary crushing pipeline, a rotating power assembly, a particle crushing knife tackle, a material falling assembly, a crushed particle recovery device and a control system, wherein the rotating power assembly comprises a motor and a rotating shaft, the particle crushing knife tackle is connected to the rotating shaft of the rotating power assembly through a flat key, the rotating power assembly is connected with a particle crushing pipeline through a bolt and a nut, the particle crushing pipeline is welded with a round-to-square flange plate and connected with the material falling assembly through a bolt and a nut, the crushed particle recovery device is placed on a crushing pipeline outlet, and the control system is connected with and controls the motor of the rotating power assembly and the material falling assembly. The crushing method adjusts the rotating speed of the rotating power assembly and the material falling speed of the material falling assembly through the control system, circulating water is pumped, non-premixed particles in a hopper is discharged down, and an outlet recovery device recovers crushed particles.

The invention discloses a cutting chipping gas-solid separation and dust collection treatment system. The cutting chipping gas-solid separation and dust collection treatment system structurally comprises an induced air dust collection cover device arranged on a machine tool in a sliding manner; two settling bins are arranged in parallel under the induced air dust collection cover device; electric unloaders are arranged at the bottoms of the two settling chambers; an air outlet pipeline is arranged at one sides of the settling chambers; a scraper conveyor is arranged under the electric unloaders; an elevator is arranged at the discharge end of the scraper conveyor and connected with a storage bin; the air outlet pipeline is connected with a pulsing bag-type dust remover; a screw discharger is arranged under the pulsing bag-type dust remover; an air outlet of the pulsing bag-type dust remover is connected with an induced draft fan which is connected with a chimney. The cutting chipping gas-solid separation and dust collection treatment system is capable of overcoming the shortcomings in the prior art; as a result, the air pressure and air speed requirements of the system are reduced, the abrasion of particle recovering to the pipeline is reduced and the dust removal effect is good; besides, the labor intensity is reduced and the production efficiency is improved.

The invention discloses a subway foundation pit dewatering well with a pressure reduction monitoring effect. The subway foundation pit dewatering well comprises an upper water feeding layer and a lower water filtering layer, and a steel reinforcement cage is arranged in the well and penetrates through the water feeding layer and the water filtering layer from top to bottom; a steel pipe is arranged on the portion, inside the steel reinforcement cage, of the water feeding layer, and the steel reinforcement cage is externally filled with clay; a steel reinforcement water filtering pipe is arranged on the portion, inside the steel reinforcement cage, of the water filtering layer, and the steel reinforcement cage is externally provided with a double-layer nylon cloth and externally filled with a filtering material. According to the dewatering well device, not only is real-time monitoring on the underground water change condition achieved, but also a guarantee is provided for emergency measures of recharging water in the pit in the foundation pit excavating process, upheaval destruction in the foundation pit excavating process is avoided, therefore, settlement influences of the surrounding ground, traffic, buildings and the like are reduced, the safety of the ambient environment is guaranteed, and unnecessary losses are avoided.

The invention relates to an ecological protection construction method of a stepped 3D stiffened bridge abutment conical slope. The construction method mainly comprises the construction steps of construction of a foundation A, construction of a drainage blanket, construction of a first-storey stepped component, construction of first-storey backfill soil, protection construction of the conical slopebelow the maximum water level, and protection construction of the conical slope above the maximum water level. Through the construction method, after completion of the foundation A and the drainage blanket, the first-storey stepped component and a corner component are mounted on the foundation; the first-storey backfill soil is laid, and the backwater ends of geogrids are reversely enveloped; referring to the above steps, protection construction is conducted on the portion, below the maximum water level, of the conical slope; further layered construction is conducted on the portion, above themaximum water level, of the conical slope, the two ends of each geogrid are reversely enveloped, and an isolation zone is isolated at the end facing water. The ecological protection construction method of the conical slope has the advantages that construction is fast and convenient, the stability is high, the waterproof performance is good, the ecological effect is high, the occupied area is small, the comprehensive benefits are prominent, and the defects existing in signal ecological protection and engineering protection are overcome.

The invention discloses an inspection well for pipeline engineering and a cover structure, and belongs to the technical field of road safety. The inspection well comprises an inspection well body; aninspection well supporting assembly is attached to the well wall of the inspection well body, the inspection well supporting assembly comprises a supporting box body, the upper portion of the supporting box body is arranged in a penetrating mode, and a second assembling cover plate capable of moving up and down is arranged in the supporting box body; at least three supporting springs are arrangedbelow the second assembling cover plate, a through opening in the upper portion of the supporting box body is covered with a first assembling cover plate matched with the through opening in the upperportion of the supporting box body in shape, and the space between the first assembling cover plate and the second assembling cover plate is filled with a second filling piece, a first filling piece and a third filling piece. According to the inspection well, the influence of uneven placement of an inspection well cover caused by pavement settlement is reduced, and noise generated when a vehicle passes through the inspection well cover placed on the inspection well is low. According to the cover structure, the well cover is prevented from being abnormally opened or lost, the anti-theft and warning functions are achieved, and the well mouth vacancy under the condition that the well cover is washed away is avoided.

The invention provides a preparation method of a raw material for producing titanium dioxide of decorative base paper, and belongs to the technical field of titanium dioxide of decorative base paper. The method comprises the following steps: A, selecting titanium ore of which the residue on sieve is 10.0-20.0% under 325 meshes and the residue on sieve is 0 under 200 meshes, the water content is not greater than 0.5%, TiO2 is not less than 45%, Fe2O3 is not greater than 8%, and the temperature is not greater than 40 DEG C; selecting sulfuric acid on the concentration of 30-55% and under the temperature of being not greater than 40 DEG C; mixing sulfuric acid and titanium ore; cooling to obtain a titanium ore pre-mixed material; B, feeding the titanium ore pre-mixed material into a reaction tank; stirring; adding sulfuric acid on the concentration of 98%; reacting; then curing; C, cooling the cured material; adding dilute sulphuric acid; then adding sand filtering water to dissolve; D, adding zero-valent iron powder to the dissolved liquid to react; E, precipitating the liquid obtained in the reaction in step D; collecting supernate; filtering to obtain titanous sulfate containing not greater than 30mg/ L of filtrate solid content. The method is stable to operate, high in acidolysis rate, stable in quality index, and stable in quality of titanium dioxide prepared by the sulfuric acid method.

The invention provides a construction method for continuously and downwards penetrating a large-diameter water conveying pipeline in a shield interval. The construction method is mainly used for construction of continuous downward penetration of at least two large-diameter water delivery pipelines in a large-diameter shield section, and the downward penetration area is provided with an overhaul well of the water delivery pipelines. The construction method sequentially comprises the processes of reinforcement of a shield section left and right line underneath penetrating water conveying line range and a water conveying pipe overhaul well, reinforcement of a pipe shed vertical shaft construction range, pipe shed vertical shaft construction, monitoring point burying, shield trial tunneling and radial grouting reinforcement in the shield underneath penetrating process. The construction method is high in universality, orderly in procedure connection and small in cross operation influence, the related problem that a large-diameter water conveying pipeline continuously and downwards penetrates through the shield section is solved, the construction method can be widely applied to construction of downwards penetrating through other buildings (structures) in the shield section, the construction quality of the shield section tunnel is guaranteed, and the construction period is shortened. And breakage of the large-diameter water delivery pipeline is avoided.

The invention discloses an adjacent existing line retaining wall type high-speed rail roadbed coordinated settlement control construction method based on intelligent monitoring, and relates to the technical field of constructional engineering.The overall construction sequence is as follows: firstly, intelligent monitoring instruments and equipment are laid to conduct automatic detection on a whole construction railway section, then a first metal separation net is constructed, and then a site is primarily leveled; and high-pressure jet grouting pile and isolation pile construction is carried out, foundation pit excavation and supporting are carried out after pile arrangement is completed, a retaining wall type roadbed construction stage is entered, and cantilever retaining wall roadbed filling is carried out. The construction method is simple, the influence on settlement of the adjacent existing lines in the construction process can be effectively reduced, the safety and comfort of the operation railway are guaranteed, the construction quality is high, differential settlement of the transition section of the new roadbed and the old roadbed is greatly reduced, an intelligent monitoring system is adopted for settlement and displacement monitoring in the whole construction railway section construction period, the deformation condition of the existing structure in the construction period is mastered in time, deformation overrun is controlled and treated in time, and the operation safety of a business line is ensured.

The invention discloses a construction method for shield tunneling under an existing station in a silt layer, which comprises the following steps: step 1: removing the portal (1) of the existing station (2); step 2: removing the existing station ( 3) and the existing station (2) for reinforcement; step 3: the shield machine passes through the reinforcement area of ​​the starting end of the existing station (3); step 4: the shield machine passes under the floor of the existing station (3) range, and carry out synchronous grouting and secondary grouting during the underpass; step 5: the shield machine passes through the existing station (3) and exits the end area of ​​the existing station; step 6: the shield machine exits the existing station (3) ) and grind the retaining piles of the existing station (3). The invention can reduce the impact of disturbance on the silt layer soil during the tunneling process of the shield machine, effectively control the attitude of the shield machine, reduce the impact of ground subsidence, reduce construction risks, and speed up the construction period.

The invention discloses a silica sol reinforcing device for preventing a shield tunneling machine from sinking in liquefiable sand. The device comprises a bending pipe jacking system, a silica sol injection system, a water pumping system and water separation plates; the bending pipe jacking system includes bending pipes perforated in the side edges; two rows of bending pipes are inserted in a foundation on two sides of an area where a shield tunnel is to be built; the silica sol injection system includes a silica sol solution injection main pipe, a first water pump and a silica sol storage container connected in sequence; the water pumping system includes a water pumping main pipe, a second water pump and a liquid storage pool connected in sequence; two rows of water separation plates are inserted in the foundation on two sides of the area to be built with the shield tunnel; a silica sol solution injection bending pipe is connected with the silica sol solution injection main pipe; and a water pumping bending pipe is connected with the water pumping main pipe. The device reinforces the liquefiable sand around the shield tunnel to be built through silica sol solution, is fast in permeation speed of the silica sol solution in the reinforcing process, is low in cost, is low in turbulence on surrounding environments, and can prevent vibration liquefication of the soil in the shield tunneling process to cause sinking of the shield tunneling machine after reinforcement.