Have you seen the anchor pad? Do you know what this is? An anchor pad is a pad connected with an anchor. Generally, an anchor will have an anchor pad. Then do you know the price of anchor pad? Many people don't know what the function of anchor pad is and what its characteristics are. Anchor pads are actually used for installation and pressure bearing, mainly used in construction projects. Next, let's look at the price and classification of anchor pads.

I. Price

Generally between 50 yuan and 1000 yuan.

Second, the theoretical classification

1, suspension theory

1952~ 1962 Louis? A. Panek (Louis? Appanek) and others published the suspension theory, and thought that the function of bolt support was to suspend the weak rock stratum on the upper stable rock stratum. For the layered rock mass exposed in the mining roadway, the direct roof is prone to bending, sinking and deformation. If the bolt is squeezed in time and hung on the main roof, the direct roof will not be separated from the main roof or even fall off. The suspension function of anchor mainly depends on the thickness and number of layers of the suspended rock, the relative stiffness and elastic modulus of the rock when bending, and is also influenced by the length, density and strength of the anchor. This theory was put forward earlier, and it has certain practical value under the condition of meeting its preconditions.

2. Composite beam theory

According to the theory of composite beam, there are many layered roofs in the roadway roof, which can be regarded as a kind of beam with two sides of roadway as fulcrums, and this rock beam supports the upper rock load. The layers are "bound" into a complete composite beam with anchor rods to prevent rocks from sliding along the layers and avoid delamination of the layers. Under the load of overlying strata, the maximum bending strain and stress of this thick composite beam will be greatly reduced, and the deflection will also be reduced.

3. Combined arch theory

Combined arch theory is developed by Langer (T? Answer? Lang) and Pender's photoelastic experiment. According to the principle of combined arch, when the prestressed anchor is installed in the fractured zone of surrounding rock of arched roadway, the compressive stress will be distributed conically at both ends of the anchor. If the distance between the anchor rods arranged around the roadway is small enough, the compressive stress of each anchor rod is staggered, so that the rock strata around the roadway form a continuous combined zone (arch).

Third, characteristics

① The roadway parallel to the maximum horizontal stress is least affected by the horizontal stress, and the stability of the roof and floor is the best; ? (2) The roadway intersecting with the maximum horizontal stress forms an acute angle. Its roof deformation and failure are biased towards a certain group of roadway; ? ③ The stability of roadway roof and floor perpendicular to the maximum horizontal stress is the worst.

Fourth, the role:

Just like the nut on the nail nailed into the board, it improves the stress at the end and enhances the reinforcement effect. It is convenient to apply prestress when using prestressed anchor.

? Five, the correct installation method:

1) drilling: use a common rock drill to drill holes and clean them. 2) Insert anchor rod: insert the hollow grouting anchor rod with anchor head into the borehole. 3) Install the slurry stop plug, backing plate and nut: Install the exhaust pipe according to the surrounding rock conditions. 4) Connect the grouting machine: Connect the end of the anchor rod with the selected grouting machine through the grouting machine. 5) Grouting: Start the machine for grouting. If pressure grouting is needed to improve the surrounding rock structure, just wait until the pointer on the pressure gauge rises to the design pressure.

The above is an introduction to the price and classification of anchor pad. Anchor pad is a tool that can keep the horizontal force of a building constant. It is mainly used to measure the angle and verticality of a building, and it is a more accurate measuring tool. However, the stability of the anchor pad is slightly poor, and it is easy to collapse. When using it, we must pay attention to stability to prevent the anchor pad from suddenly collapsing. When choosing an anchor pad, you need to check the flatness of the pad, and don't buy it if it is uneven.

Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp； Wb, you can get it for free ~