When the a diameter of grouting connecting reinforcement is less than or equal to 16, the a diameter of connecting reinforcement is greater than
The specification and weight of the grouting pipe are actually very well understood. It is the approximate method for calculating the weight of the grouting pipe per linear meter, and it is also the only correct algorithm that can be found now: the weight of the grouting pipe = 0.0246615 × (outer diameter of grouting pipe - wall thickness of grouting pipe) × Wall thickness of grouting pipe.The normal writing should be: w = 0.02466 * s (D-S), where d = outer diameter s = wall thickness.
Sherbrooke.The grouting pipe can be divided into unconstrained grouting pipe and constrained grouting pipe according to whether it can absorb the pressure thrust (blind plate force) generated by the medium pressure in the pipe; According to the displacement type of the grouting pipe, it can be divided into axial grouting pipe, transverse grouting pipe, angular grouting pipe and pressure balance grouting pipe. The grouting pipe cannot bear load and should be hoisted separately; In addition to the pre deformation required by the design for pre stretching or cold tightening, it is forbidden to adjust the installation deviation of the pipeline by deforming the grouting pipe; During installation, welding slag is not allowed to splash onto the surface of grouting pipe and suffer other mechanical damage; All movable components of the grouting pipe shall not be jammed by external components or restrict the normal operation of its movable parts. Most of the failure of the grouting pipe is caused by the external environment corrosion. Therefore, in the structural design of the grouting pipe, the contact between the external corrosion medium and the grouting pipe can be considered. For example, for the external pressure axial grouting pipe, a packing sealing device can be added between the outlet end ring and the outlet pipe, which is equivalent to the sleeve grouting pipe. It can not only resist the invasion of external corrosive media, but also add a safety barrier to the grouting pipe. Even if the grouting pipe is damaged, the grouting pipe can also play a compensation role and avoid the failure of the grouting pipe. The use of grouting pipes has been indispensable in modern building construction. In the 1960s, grouting pipes were popularized in China, but they were fastener grouting pipes. In the 1980s, China began to develop advanced grouting pipes with multiple s. With the continuous development of China's construction industry in modern times, the construction industry has become increasingly mature and perfect in China, and the bamboo wood grouting pipe has been eliminated by the market. Grouting pipe has become the mainstream form of grouting pipe and is more widely used in construction.
Slump test shall be carried out for concrete entering the site. No less than 3 groups of test pieces shall be made for the same batch of concrete with the same strength grade. One group is used for standard curing, and the other two groups are used for curing under the same conditions to determine demoulding and allowable lifting time.
.There are mainly water glass calcium chloride slurry, water glass fluorosilicic acid slurry, acidic water glass slurry, HS water glass (acidified water glass) slurry and SS water glass (silica sol) slurry .
Non woven filter cloth layer outside the framework. Only water and grout are allowed to pass through and other materials such as cement slurry in concrete are blocked outside the grouting pipe to ensure smooth use of the whole section of the grouting pipe.
How to connect the grouting water stop needle and the grouting pipe after the grouting water stop needle and the grouting pipe are connected, a set of grouting system will be formed. As long as the small part of the grouting needle is inserted into the joint of the lotus petal grouting pipe, a closed and self-locking grouting system will be formed.
Select appropriate transmission voltage and amplifier gain and keep them unchanged during retest.
The grouting pipe with the grouting pipe as the core flexible element can be compensated in the axial, lateral and angular directions on the pipeline. From the perspective of its performance, the internal pressure grouting pipe can be displaced in three directions, but because it is limited by casing and other accessories,Sherbrooke50lacrimal duct, it can often only be displaced in the axial direction. Therefore, the user needs to indicate the displacement in several directions when selecting and ordering, so as to select correctly. The working principle of the grouting pipe is to use its own elastic deformation to compensate the axial, angular, lateral and combined displacement of the pipe due to thermal deformation, mechanical deformation and various mechanical vibrations. The compensation has the s of sealing, pressure resistance, temperature resistance, corrosion resistance, vibration reduction and noise reduction, there will be some deviation in the calculation formula of the weight of the precise grouting pipe. Next, I will tell you the actual application of several specifications.
At present, Wuhan University of technology has completely replaced cement clinker with ground industrial waste slag (fly ash, slag and steel slag) and successfully prepared a new type of two liquid grouting material with different gel time (3 ~ 300 s), high consolidation strength (~ 25 MPa) and stone rate of by using water glass to stimulate industrial waste slag which has been successfully applied in the construction of Wuhan Yangtze River Tunnel .
The comparison between the embedded detection and the on-site detection of the grouting pipe is yzed as follows: The embedded detection pipe: The pile diameter of 0.6 ~ 0.8m should be buried with double pipes; Three pipes shall be buried with pile diameter of 0.8 ~ 0m; Four pipes shall be buried above the pile diameter of 0m. According to the specific situation of Chifeng bridge, three pipes can be buried in the pile foundation.
After checking that the formwork installed by the grouting pipe is tight and seamless, the reserved groove can be cleaned, and then the concrete can be poured and vibrated tightly. The concrete shall have at least the same strength as the structural concrete at this place. The grouting pipe device in Hainan shall be kept clean when pouring concrete.
details. The inner core of the grouting pipe is rigid, which can ensure that it will not be crushed under the concrete pressure. The non-woven filter cloth layer outside the framework only allows water and grouting fluid to pass through,SherbrookeAdvance small conduit support, and other materials such as cement slurry in concrete are blocked outside the grouting pipe to fully ensure the smooth use of the whole section of the grouting pipe.
Disposal method: the grouting pipe shall be shortened according to the specification.
 the beneficial effects of the utility model are as follows: the utility model is set in the grouting pipe,SherbrookeDouble layer small conduit advance support, reduces the operation intensity of workers by using the lead screw principle, and reduces the quantities of clearing the roadway floor by using the rotary cutting in the casing pipe; The cutting depth can also be adjusted at will according to the actual situation of the roadway. The working efficiency is 4-5 times higher than that of manual cutting, which can greatly reduce the labor intensity of workers.
Sherbrooke.The setting and curing reaction of cement water glass slurry includes cement hydration reaction and the reaction of Ca (OH) 2, the product of cement hydration reaction with water glass, that is, after cement and water are mixed into cement slurry, Wuhan University of technology has completely replaced cement clinker with ground industrial waste slag (fly ash, slag and steel slag) and successfully prepared a new type of two liquid grouting material with different gel time (3 ~ 300 s), high consolidation strength (~ 25 MPa) and stone rate of by using water glass to stimulate industrial waste slag, which has been successfully applied in the construction of Wuhan Yangtze River Tunnel .
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 .