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

Provided is an electrical characteristic measurement device that can precisely measure the electrical characteristics of blood. The electrical characteristic measurement device, which has a measurement unit that measures the electrical characteristics of blood that is the subject of measurement and filling a sample vessel by imposing a voltage between an electrode pair of the sample vessel provided with one or more pairs of electrodes, is provided with a rotary mechanism that rotates the sample vessel to any given angle, and the electrical characteristics of blood are measured over time by the measurement unit while rotating the sample vessel by means of the rotary mechanism, for example, intermittently in a rotational manner and / or alternating turning forward and turning backward.

In view of the many environmental problems in the traditional landfill treatment goaf and the related problems in the later stage, the purpose of the present invention is to provide a method for repairing the tunnel under the tunnel through the freezing method, including: S1. Measurement and positioning; S2. Drilling S3. Intubation; S4. Embedding of frozen hoses; S5. Freezing construction. After the construction of the lowered tunnel is completed, the salt water is circulated to cool down and gradually freeze. The hose used in the present invention flows into the underground cavity together with the frozen water, and can effectively enter the narrow cavity area for freezing, which improves the freezing efficiency more effectively, and can effectively freeze the surrounding rock of the cavity, thereby strengthening the cavity stability of surrounding rock. The invention effectively reduces the impact of undercutting the goaf.

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.

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 relates to a construction method for widening a high-fill roadbed with foam light soil, which is characterized in that the original old roadbed is first cut into a stepped shape, and a concrete baffle is arranged on the periphery of the widened side of the roadbed as a formwork for pouring foam light soil. The reinforcement mesh is laid horizontally at the position of the large platform to connect with the baffle, and prestressed anchor rods are added to anchor on the baffle, and the pouring construction of foam light soil is carried out by layering, partitioning and segmenting, and finally the baffle is removed and the hanging type is installed. Geotechnical bag: The construction method includes original subgrade construction, baffle installation, lightweight foam soil pouring, steel mesh and drainage pipe installation, anchor cable construction, lightweight foam soil pouring, steel support removal and installation of hanging geotechnical bags. According to the invention, baffles and pre-embedded section steel are provided on the widened side of high filling to form a stable support structure, which can effectively improve the stability of the baffle, and the section steel after construction can be recycled and used, reducing material loss and engineering cost.

The invention discloses a construction method enabling a shield tunneling machine to underneath pass through an existing station to start. A steel sleeve is adopted for construction, and the followingflow including bottom plate levelling and steel plate laying for an underneath passing channel, vertical freezing reinforcement for a tunnel door, installation for the lower half-circle of the steelsleeve, downhole installation for the shield tunneling machine, overall underneath passing and longitudinal movement of the steel sleeve, breaking for the tunnel door, installation for a negative ring, backfilling for the sleeve, pressure testing, pulling-out for a freezing pipe, sealing for a freezing hole, and starting of the shield tunneling machine. The steel sleeve comprises a main sleeve body, a transition ring, a reinforcing ring, a bottom frame and a counter-force frame, wherein the main sleeve body is formed by splicing four sections of sleeve bodies with the same length; and each sleeve body is composed of an upper half-circle sleeve body and a lower half-circle sleeve body. The transition ring is connected to the front end of the main barrel body; the reinforcing ring is connected to the rear end of the main barrel body; the bottom frame is also divided into four sections of bases; and the counter-force frame is connected to the rear end of the reinforcing ring. According tothe construction method, damage to a constructed station structure can be avoided, the construction risk and difficulty of starting driving of the shield tunneling machine and later-period detachmentfor the sealing device for the tunnel door are lowered, and the construction period is accelerated.

The invention discloses a mounting process of mixed brackets. The mounting process of the mixed brackets comprises the following steps: (1) floor brackets are mounted on the ground; the lower ends ofthe floor brackets extend underground; the floor brackets are pressed down; and the floor brackets are distributed around a lower-layer bridge; (2) longitudinal support beams are mounted at the tops of the lower-layer bridge and the floor brackets, and are arranged in the longitudinal direction of the bridge; (3) transverse support beams are mounted on the floor brackets and the longitudinal support beams; and (4) the floor brackets are mounted on the transverse support beams. The mounting process of the mixed brackets is balanced in load, stable in structure and firm in installation, adopts an assembled structure, performs the machining in the later period and the assembly in the previous period to reduce the scene assembly and disassembly workload, improves the bracket construction efficiency, reduces the transfer material loss, adopts large-diameter steel pipe piles to reduce the pile foundation stress to achieve enough safety stock, and prepresses the steel pipe piles beforehand toreduce the settlement influence of the steel pipe piles.

The invention belongs to the technical field of chemical production equipment, and relates to a filtering device for realizing the separation of catalysts in the production of polytetramethylene enigmatic glycol, comprising an upper cylinder body and a lower cylinder body sealed and connected, and a tube plate fixedly connected to the inner wall of the lower cylinder body , the upper surface of the tube plate is fixedly connected to the filter element, the first polytetrafluoroethylene gasket is set between the filter element and the tube plate, the upper part of the filter element is set with a pressure plate, and several vertically extending screws are fixed on the tube plate, and the upper ends of the screws correspond to the pressure plate Through the through hole of the screw rod, a spring is sleeved on the upper end of the screw rod, the lower end of the spring is pressed against the upper surface of the pressure plate, and the upper end of the spring is pressed against the bottom surface of the nut on the screw rod. When the filtering device works, it runs stably, which greatly improves the use efficiency of the filter element.

The invention discloses an internal supporting trolley system of a shield tunnel under the condition of small spacing, shallow covering soil and small radius. The track of the trolley adopts the original track of the shield trolley; the trolley includes a frame, a running mechanism and a supporting mechanism. The upper part of the frame can accommodate the ventilation duct, and the lower part spans the muck truck without interfering with it. The support mechanism includes arc braces, sliding hinges and telescopic top pieces. The arc braces are distributed on the upper part and both sides of the tunnel with gaps between them. The arc braces are slidably hinged to the vehicle frame through sliding hinges. 1. Through the telescopic connection between the telescopic top piece and the vehicle frame, when the telescopic top piece drives the arc-shaped plank to push out and retract, the sliding hinge plays the role of guiding and limiting. This system avoids segment damage, leaves space for ventilation ducts and muck to travel, and minimizes the impact on the starting line tunnel.

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 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.