Calculate the quantity of earthwork excavation? How to calculate the amount of earthwork excavation

Hello. The calculation method of foundation pit earthwork is as follows:

Formula: v=1 3h (s up + (s down * s up) + s down) s up = 140

S = 60v = 1 3 * 3 * (140 + 60 + 140 * 60) = 10m long and 6m wide

The length of the upper and lower parts of the foundation pit is 14m

The upper bottom is 10m wide

The excavation depth is 3m

Excavation slope rate 1:

Find the amount of earthwork excavated in the foundation pit.

Cylinder: Volume = Base Area High.

Box: Volume = Length, Width, Height.

Cube: Volume Edge Length Edge Length Edge Length Ridge Length Cone. Body:

The bottom area is 3 units high. Body:

v = [s up + (s on s down) + s down] h 3

Sphere deficiency volume formula h2(3r-h) 3

Sphere volume formula: V4R33

Prismatic volume formula: v s bottom h s straight section ll is the side edge length, h is the height).

Prism volume: v= s1 s2 open root number (s1*s2) Definition of 3*h foundation pit engineering:

In order to ensure the foundation pit construction, the safety of the main underground structure and the surrounding environment are not damaged, the supporting structure, precipitation and earthwork excavation and backfilling, including survey, design, construction, monitoring and testing, etc., are called foundation pit engineering. Foundation pit engineering is a systematic engineering integrating geological engineering, geotechnical engineering, structural engineering and geotechnical testing technology. Its main contents:

Engineering survey, supporting structure design and construction, earthwork excavation and backfill, groundwater control, information construction and surrounding environmental protection, etc. The simplest and most economical way for foundation pit construction is to enlarge the slope excavation, but it is often limited by the site conditions and the surrounding environment, so it is necessary to design the support system to ensure the smooth progress of the construction and can better protect the surrounding environment.

Note: v: volume; s1: upper surface area; s2: lower surface area; H: High.

I specialize in earthwork, earthwork is changeable during construction, and the total amount of the project will be adjusted according to the actual situation on site at any time, so it is to tell you the data now, you can't use it, I will tell you a set of simple calculation methods, you can use it according to the actual situation. (1).Earthwork excavation amount = foundation pit length * width * depth + depth * slope ratio * depth.

2).Reserved soil = amount of excavated earthwork - amount of foundation concrete earthwork. （3）.

The amount of earthwork transported = the amount of concrete. It should be noted that here it is necessary to determine the imaginary square of the soil according to the actual situation, and the calculation can be accurate after conversion. When encountering engineering changes, it is good to calculate according to the above calculation principles.

Excavation earthwork calculation method.

1. List rules:

Calculate the bottom area of the excavation:

Method. 1. Use the floor area of the ground floor area from the outer skin of the outer wall to the outer skin of the cushion. Calculation of the area from the outer edge of the exterior wall to the outer edge of the cushion (calculated according to the outer edge of the exterior wall and the outer edge of the outer edge of the outer wall in the outer shape of the outer shape in blocks, or according to the "centerline of the outer edge of the outer shape, the length of the outer edge". ）

Method. 2. Calculate the area of the outer edge of the cushion in blocks (calculate the construction area in the same block).

Calculate the volume of the excavation: volume of the earthwork Bottom area of the excavation Excavation depth.

2. Quota rules:

The upper and lower bottom areas of the excavation are calculated using the table volume formula. v=1 6 h (4 s in s and below s) to calculate the earthwork volume (where the upper part of s is the upper bottom area, the middle section area of s is the middle section area, and the lower bottom area is the lower bottom surface area of s of s).

S below the floor area of the ground floor The area from the outer skin of the exterior wall to the bottom edge of the excavation (including working face, drainage ditch, grading, etc.). Calculate the in-s and under s in the same way.

Engineering calculations. Scatter method:

According to the current topography of each project piece, the leveling field is determined. Select the earthwork calculation method based on the terrain conditions. Although the terrain of each project here is undulating, the changes are relatively uniform and not too complicated. Therefore, the scatter method is used to calculate the earthwork quantity.

The process is: determine the design elevation of the field surface, calculate the average depth of cut and fill, calculate the area of cut and fill, and calculate the amount of cut and fill. Here's how:

1. Determine the design elevation of the field h:

ha=(h1+h2+..hn)/n

where: ha is the average elevation of the field surface (m);

h1、h2...hn is the elevation of each measurement point (m);

n is the number of elevation points.

2. Calculate the average depth of excavation and filling

The average fill height of the fill area: ht=h- ht l

Average digging depth in the cutting area: hw = hw m-h

where: l is the number of measurement points with an elevation of less than h;

m is the number of measurement points with an elevation greater than h;

ht is the elevation (m) of each measurement point with an elevation less than h;

hw is the elevation (m) of each measurement point with an elevation greater than h.

3. Calculation of cut-and-fill area

Fill area: at=aa ht (ht+hw).

Cut area: aw=aa hw (ht+hw).

where: aa is the total area of the plot.

4. Calculation of the amount of excavation and filling:

Fill amount: vt=at ht

Cut: vw=aw hw

5. Calculation of planting soil quantity:

It is necessary to determine the thickness of the peeling layer, the peeling of the excavation area, the starting and ending depth of the backfill, and the starting and ending height of the peeling and backfilling of the filling area.

For example, the thickness of the topsoil of this project is calculated as 15cm, and if the excavation depth is less than 10cm in the excavation area, the topsoil will not be stripped; In the filling area, the topsoil stripping is not carried out if the filling depth is less than 40cm; According to the sum of the corresponding excavation and filling area, multiply the planting soil layer by 30cm (peel off the 15cm layer plus the backfill layer 15cm).

Quantity takeoff calculation formula.

v pit = (a+2c+kh)*(b+2c+kh)*h+1 3k*k*h*h*h*h.

Wherein, a and b are the side lengths, c is the working face, k is the grading coefficient, h is the digging depth, and k can be calculated according to 0 when the slope is not graded. V slot = (A+2C+Kh)*H*L.

Wherein, A is the width of the base bottom, C is the working face, K is the grading coefficient, H is the digging depth, L is the length of the foundation groove, and K can be calculated according to 0 when the slope is not graded.

Calculation method: When calculating the amount of earthwork, it is necessary to take into account the terrain characteristics, accuracy requirements and construction costs, etc., and select the appropriate calculation method to achieve the optimal purpose.

In relatively flat plain areas and sites with little undulating terrain, the square grid method should be adopted. The advantages of this method are: the amount of data calculated is small, the calculation speed is fast, and the huge data storage volume of the DTM method is omitted.

In long and narrow areas, such as roads, channels, ditches, etc., it is suitable to use the cross-section method to calculate the earthwork quantity.

In some mountainous areas with large undulating terrain and high accuracy requirements, the DTM calculation method is required. However, it is also necessary to take into account the amount of data and data storage in the drawing itself.

In areas where accuracy is not high and the terrain is simple, the average elevation method can be selected.

The calculation of earthwork should be as accurate as possible. The calculation of earthwork quantity includes the sum of the amount of filling and excavation. The calculation method of earthwork quantity is: take the distance between two adjacent cross-sections as the calculation unit, that is, find the area of the roadbed on the adjacent two cross-sections and the distance between the two cross-sections respectively.

In the area where the terrain is complex and undulating, or the ground is long and narrow, and the depth of excavation and filling is large and irregular, it is advisable to choose the cross-sectional method for earthwork calculation.

The accuracy of earth and rock quantity is related to the length of the spacing l, and the smaller the l, the higher the accuracy. However, this method is computationally intensive, especially when the range is large and the accuracy requirements are high. If the cross-section interval is increased in order to reduce the amount of calculation, the accuracy of the calculation result will be reduced. Therefore, there is a contradiction between the calculation accuracy and the calculation speed of the cross-section method.

2. Grid method.

For the estimation of large areas of earthwork and some sites with small terrain fluctuations and gentle slope changes, the grid method is suitable to divide the site into several square grids, and then calculate the volume of each quadrangular prism, so as to summarize the volume of all quadrangular prisms to obtain the total earthwork quantity. In the traditional grid calculation, the calculation accuracy of earthwork is not high.

where: a, b——— are the length and width of the substrate, respectively;

k——— slope factor.

c——— Widen the width of the working face.

h——— the depth of the foundation pit.

2. Foundation trench excavation: V=(A+2C+K H)H L.

where: v——— amount of earthwork in the foundation groove.

a——— width of the bottom of the trough.

c——— the width of the working face.

h——— depth of the base groove.

l——— length of the base groove.

k——— slope factor.

The amount of excavation is all about calculating how much you want to dig.

There are different calculation rules:

There are rules for quotas.

There are rules for bill of quantities valuation.

Let's find these two things and learn.

Please measure the height, width and length of the filling to calculate the amount of excavation.

Excavation earthwork calculation method.

1. List rules:

Calculate the bottom area of the excavation:

Method. 1. Use the floor area of the ground floor area from the outer skin of the outer wall to the outer skin of the cushion. Calculation of the area from the outer edge of the exterior wall to the outer edge of the cushion (calculated according to the outer edge of the exterior wall and the outer edge of the outer edge of the outer wall in the outer shape of the outer shape in blocks, or according to the "centerline of the outer edge of the outer shape, the length of the outer edge". ）

Method. 2. Calculate the area of the outer edge of the cushion in blocks (calculate the construction area in the same block).

Calculate the volume of the excavation: volume of the earthwork Bottom area of the excavation Excavation depth.

2. Quota rules:

The upper and lower bottom areas of the excavation are calculated using the table volume formula. v=1 6 h (4 s in s and below s) to calculate the earthwork volume (where the upper part of s is the upper bottom area, the middle section area of s is the middle section area, and the lower bottom area is the lower bottom surface area of s of s).

S below the floor area of the ground floor The area from the outer skin of the exterior wall to the bottom edge of the excavation (including working face, drainage ditch, grading, etc.). Calculate the in-s and under s in the same way.

Checklist Rules:

Calculate the bottom area of the excavation: method.

1. Use the construction area of the ground floor + the outer skin of the outer wall to the cushion.

The area of the integument. Calculation of the area from the outer edge of the exterior wall to the outer edge of the cushion (calculated according to the outer edge of the exterior wall and the outer edge of the outer edge of the outer wall in the outer shape of the outer shape in blocks, or according to the "centerline of the outer edge of the outer shape, the length of the outer edge". Method.

Second, the outer edge of the cushion is calculated in blocks.

Calculate the volume of the excavation: volume of the earthwork Bottom area of the excavation Excavation depth. 2. Quota rules: use the prism.

Quota Rule: Utilizes the table volume formula.

Calculate the bottom and bottom areas of the excavation.

Excavation earthwork calculation method.

1. List rules:

Calculate the bottom area of the excavation: method.

1. Use the floor area of the ground floor area from the outer skin of the outer wall to the outer skin of the cushion. Calculation of the area from the outer edge of the exterior wall to the outer edge of the cushion (calculated according to the outer edge of the exterior wall and the outer edge of the outer edge of the outer wall in the outer shape of the outer shape in blocks, or according to the "centerline of the outer edge of the outer shape, the length of the outer edge". Method.

2. Calculate the area of the outer edge of the cushion in blocks (calculate the construction area in the same block). Calculate the volume of the excavation: volume of the earthwork Bottom area of the excavation Excavation depth.

2. Quota rules:

The upper and lower bottom areas of the excavation are calculated using the table volume formula. v=1 6 h (S + 4 S + S down) to calculate the earthwork volume (where S is the upper bottom area of the branch spike, S is the middle section area, and S is the lower bottom area). As shown below:

S below the floor area of the ground floor The area from the outer skin of the exterior wall to the bottom edge of the excavation (including working face, drainage ditch, grading, etc.). Calculate the in-s and under s in the same way.

3. Difficulties in the calculation of excavation.

When calculating the upper, middle and lower bottom area of the excavation, it is necessary to calculate the center line of the "respective edge line to the outer edge line of the exterior wall" part, which is more troublesome to calculate (the same as leveling the site).

It is not easy to calculate the area of the bend in the middle of the noisy state.

The overlapping place is not easy to deal with (the same as the level site).

If there are inconsistencies in some edge grading factors, it is difficult to deal with.

4. The relationship between large excavation and foundation trench excavation and foundation pit excavation The width of the bottom of the groove is less than 3m and the length is three times the width or the area of the bottom of the groove is less than 20m2 for the trench, and the rest is for excavation.