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Catago50lacrimWhen the daily average temperature is lower than 5 ℃, no watering and thermal insulation measures shall be taken. Steam curing can be used when the temperature cannot reach the natural curing conditions or early demoulding is required. Generally steam curing should be carried out at a temperature of about 65 degrees. Canvas and tarpaulin should be used for curing. In order to avoid crack deformation of concrete components caused by sudden rise and fall of steam temperature, the speed of temperature rise and drop must be strictly controlled.
Post grouting: after the shaft tunnel, basement and other structures are dug, the grouting method is used to control water damage and strengthen the stratum, fast time, no loss, free from climate and place constraints.
When reinforcing collapsible loess, sodium silicate solution with 5% sodium chloride and concentration of 10% ~ 15% is used. After the solution is pressed into the soil layer, sodium ions will react with calcium ions in water-soluble salts of the soil to form silicic acid gel between soil particles and on their surfaces, and harden the soil. The ultimate compressive strength can reach 0.2 ~ 0.8MPa. When strengthening the silty fine sand, a certain amount of phosphoric acid (density 0 is added to the sodium silicate solution (density 18-2 with a low concentration. The solution is chemically reacted in the soil to harden the soil, and its ultimate compressive strength can reach 0.4-0.6mpa.
.[4] It is believed that it is undoubtedly one of the research directions of new grouting materials coordinated with the sustainable development of the times to develop high-performance and green grouting materials by effectively using large quantities of industrial wastes instead of pure cement clinker in China.
In addition, the water corrosion test results of the grouting material simulating the fresh water erosion environment show that the strength of the stone body of the grouting material does not lose under the condition of water corrosion for 180 days, which shows that the water corrosion resistance durability of the water glass industrial waste two liquid grouting material is better than that of the cement water glass two liquid grouting material [7].
Curing The concrete components shall be covered and moisture cured within 12h after pouring. The time of concrete curing by watering shall not be less than 7 days for the concrete mixed with Portland cement, ordinary portland cement or slag Portland cement; For the concrete mixed with retarded admixture or with impermeability requirements, it shall not be less than 14 degrees. The cured concrete shall be covered with plastic cloth, and all exposed surfaces shall be tightly covered, and condensed water shall be kept in the plastic cloth.
Most of the grouting pipes on the market are 6 meters in stock, so there are few in stock. In fact, they have different styles and different names. There are cross pair perforations and plum blossom holes. There are about 100 holes in the whole pipe, which can be described as a hundred holes. One end of this pipe has plugs, sharp and round, depending on the customer's requirements. The other end is welded with reinforcing bars from the pipe section to prevent the pipe section from tearing. This kind of pipe is called steel flower pipe. Steel flower pipe is generally used for high-speed maintenance grouting to protect mountains and prevent landslides. Holes are drilled on the steel flower pipe, which is more conducive to the penetration of cement mortar liquid into the rock and soil mass of the rock stratum and to the anchoring. In order to prevent the hole from being blocked by stones,OakvilleAdvance small conduit in stock, sometimes the design requires reinforcement to protect the hole. After grouting, the pipe orifice must be closed, so as not to let the grouting liquid flow out. The general classification of grouting pipe models can be divided into ordinary standard connection and pipe hoop connection according to their different connection methods.
The Xiaobian of prestressed machines and tools reminds us that there are many forms of grouting pipes, which can be distinguished from different angles, including the following. According to the type of reinforcement of the grouting pipe,OakvilleGrouting hollow anchor manufacturer, it can be divided into the grouting pipe of thick reinforcement of the grouting pipe, the grouting pipe of parallel reinforcement (wire) bundle of the grouting pipe and the grouting pipe of steel strand bundle of the grouting pipe. For thick reinforcement, one grouting pipe is generally used to anchor one reinforcement. For tendons and steel strands, a grouting pipe must anchor several steel bars or steel strands at the same time, which are often arranged in a ring or circle, or in a rectangle. Obviously, due to the different number and arrangement of prestressed reinforcement, the form and structure of grouting pipe will also be different. According to the principle of grouting pipe and transmitting pretension, it can be divided into grouting pipe relying on bearing pressure, grouting pipe relying on friction and grouting pipe relying on adhesion.
3CaO·SiO2+nH2O→2CaO·SiO2·（n－H2O+Ca（OH）2,
Total quality assurance. Squeeze grouting or split grouting: depending on the grouting pressure, the grout is forced to open various channels in the underground layer to squeeze into the stratum. The grout is mostly consolidated in a vein or a tree shape. This grout can squeeze the soft bottom layer tightly, so it is also called compaction grouting in foundation reinforcement. Displacement grouting: the soil and sand in the injected stratum are forced out through certain methods, and the space formed is filled with grout, It is called displacement grouting High pressure mass injection grouting: the kinetic energy of jet flow is used for grouting.
[claim] A fast cutting device in a hole of a underground grouting pipe, which is characterized in that the fast cutting device in the hole mainly consists of a fixed cutting device , a tension blade device and a cutting rotating device . The tension blade device is sleeved in the cutting rotating device , and screw threads are respectively set on the outer surface of the cutting rotating device and the upper end of the tension blade device , The tension blade device and the cutting rotating device are connected by threads. The tension blade nut is arranged at one end of the tension blade device protruding from the cutting rotating device. The fixed cutting device is mainly composed of a cutting blade and a pulley . The cutting blade and the pulley are respectively connected to both sides of the cutting rotating device through slots. Flange plates (I) and bearings are arranged on the outer surface of the cutting rotating device , The fast cutting device in the hole is installed in the grouting pipe hole through a flange plate, and the fixed cutting device is connected with the flange plate through bolts.
[Patent Description] fast cutting device in the hole of underground grouting pipe [technical field] [0001] the utility model relates to a device for cutting grouting pipe in a coal mine, in particular to a fast cutting device in the hole of underground grouting pipe.
The aerated silicification method is to press carbon dioxide or ammonia into the soil in advance to activate the soil, then pour sodium silicate solution and then press carbon dioxide to make sodium silicate gel. When the sand is reinforced, the compressive strength can reach 1000 ~ 3000kpa. For the sand without carbonate, the strength can be increased by 20% ~ 25% due to the activation with carbon dioxide first; The strength of sandy soil containing carbonate can be increased by 30% ~ 35% by carbon dioxide activation. When the collapsible loess with high saturation is reinforced, the reinforcement radius of the aerated silicification method can be about 50% larger than that of the single liquid silicification method.
how much.The grouting can be repeated many times.
When the grouting pipe is laid, it shall be kept flat and tight without wrinkling, so that the grouting pipe has effective tension. After laying,OakvilleGrouting pipe grouting, it shall be rolled again with a clean steel wheel roller. Most urban roads use glass fiber grouting pipes with self-adhesive. The diameter of the glass fiber grouting pipe is 0.5 ~ 0 times of the maximum particle size of the asphalt concrete surface aggregate. The ultimate tensile strength should be greater than 50kN / m, so as to give play to the anti reflection crack performance of the glass fiber grouting pipe. It can also ensure the shear resistance and adhesive force of the adhesive layer of the glass fiber grouting pipe.
Chemical grouting chemical grouting materials are mainly used in water glass and organic polymer grouting materials.
Oakville. Steel pipe, plastic pipe or steel corrugated pipe should be used as acoustic detection pipe, and its inner diameter should be 50 ~ 60mm. The connection of detection pipes shall be smooth transition, the nozzle shall be more than 100mm higher than the pile top, and the nozzle height of each detection pipe shall be the same. The lower end of the pipe shall be closed, and the upper end shall be covered. There shall be no foreign matters in the pipe and no damage to the pipe body.
3CaO·SiO2+nH2O→2CaO·SiO2·（n－H2O+Ca（OH）2,
Display and record the time history curve of the received signal in real time.