What do you mean by the height of the bottom pillar, the height of the strata and the height of the

Uh,This,It's easier to explain if you look at the drawings.。。。

Stage refers to the mining of a deposit (or ore body), every certain vertical distance, digging one or several main transportation roadways, these roadways in the vertical direction of the deposit (or ore body) divided into a number of sections, so the vertical direction of the adjacent two or two groups of roadways between this section, called the middle section or stage. Usually named after the floor elevation of the main transportation roadway below, such as the floor elevation of the adjacent main transportation roadway is 500m and 525m respectively, then the elevation of 500m-525m is called the middle section of 500 or the 500 stage. The stage height is 25m.

Therefore, the stage height is the vertical distance between the upper and lower adjacent stage transport roadway floors.

Similarly, to know what a layering height is, you first need to know what a layering is. Stratification is not available for all mining methods, such as total mining and retention mining. It seems to me that there is no strict definition or concept of stratification, or that it is only in a specific, specific mining method.

It is similar to the segmentation concept of the sectional mining house method and the segmented caving method, but it is different. As for whether or not the two can be equated, I don't think so. Let's talk about it from my own experience.

Figuratively speaking, due to the large height of the divided mine house or ore block, we first excavate a raise, and then excavate the rock drill roadway (used to arrange the blast hole) from the raiser along the ore body inclination or direction - a bit similar to the concept of stage, this rock drilling roadway is called layered rock drilling roadway, referred to as layering. The height of the layer is the vertical distance between the upper and lower adjacent layers.

The bottom pillar is located at the bottom of the mine and is used to protect the transportation roadway or the bottom structure of the ore block at this stage, and temporarily supports the surrounding rock. If it is a flat roadway in the protection stage, then the height of the bottom column is calculated from the bottom plate of the roadway, and if it is a protection bottom structure, it is calculated from the bottom plate of the bottom structure.

The exposed length of this layer + beam height - protective layer + bending longitudinal reinforcement algorithm set by calculation settings: layer height - exposed length of this layer - protective layer. The cross-section of the column is determined by the axial compression ratio, i.e. by the weight it is carried.

1. The distance between the two columns of the stair handrail is generally 2-3 steps, and try not to exceed 4 steps.

2. The height of the indoor guardrail is 900mm, and the height is 1050mm when the platform is 500mm.

3. Indoor guardrail height measurement: 900mm from the shoulder of the step.

The staircase columns and landing beams in the frame structure are actually small frames (subordinate frames) in the main frame system, so you should understand, right?

The height of the stairs --- from the top of the frame beams of the main structure to the top surface of the rest platform beam slabs.

My friend on the first floor said more accurately, are you doing budget or design? Doing budget columns is usually calculated.

From the top of the frame beam of the main structure to the top surface of the beam plate of the rest platform.

It's definitely a hierarchical calculation.

It is calculated according to the height of the column, the height of the bottom of the beam, the height of the wall, and the height of the bottom of the slab on each floor.

The height of the bottom column of the meter is calculated from the top surface of the foundation, that is, the cushion surface of the cushion platform.

The height of the master is calculated from the meter to the bottom of the beam, so that you can apply the quota.

According to the known occurrence conditions of the ore body, the shallow hole retention method is more reasonable. The height of the middle section is 30-50m, and the length of the block is 40-60m. According to the value of the ore, it can be determined whether it is a liujian pillar or an artificial pillar.

As for the efficiency of artificial charge, generally speaking, it is 2min 2m, which is basically 2min a hole. The charge coefficient is between (depending on the solidity of the ore rock).

The mining sequence is from top to bottom, layer by layer mining, layer by layer filling. The mining strata are arranged horizontally or at an angle (10° 15°) without leaving the top and bottom columns. Ore chutes and filling, pedestrian shafts are arranged in the ore blocks.

The mined ore is lowered through the chute to the lower stage of the transport roadway. The backfill is lowered from the upper stage transport roadway to the stope through the filling shaft. With the layered mining, the backfill and pedestrian patio are constructed along the way in the backfill.

In the case of mining stratification, the cutting roadway is first excavated and connected with the fill, pedestrian shaft and chute. The ore is returned to the ore from the approach or longwall face of the self-cutting roadway. Workers work under the cemented false top or cemented backfill constructed at the lower part of each layer of water and sand backfill to work safely.

Before the filling operation, a water filtration wall and a sealing wall are constructed on and on the sides of the mining entrance. This method is suitable for mining ore bodies where both the ore and the surrounding rock are unstable, and it is also an effective method for returning to the mining pillar.