How to tell if a project has backfill?

Generally, the backfill is relatively loose, with high moisture content, small compactness, and uniform particles, but some backfills are compacted after several years. The above characteristics are not obvious and cannot be judged concretely.

Backfill refers to the construction of the project, after the completion of the foundation and other works below the ground, and then return the filled soil.

Backfill refers to the construction process of taking soil and backfilling within 5m after the completion of concealed projects such as foundation and cushion.

Mechanical backfilling.

The content of this technical disclosure is suitable for industrial and civil buildings, structures with large area leveling sites, large foundation pits and pipe trenches and other backfill projects.

1 Material Requirements.

1) Crushed stone soil, sand (the consent of the design unit should be obtained when using fine and silty sand) and blasted stone slag can be used as fillers below the surface. Its maximum particle size shall not exceed 2 3 or 3 4 of the thickness of each layer (when vibrating rolling is used), and the moisture content shall comply with the regulations.

2) The moisture content of cohesive soil should be tested, and it must meet the requirements of the design and construction specifications before it can be used.

3) Saline soil is generally not usable. However, the filler shall not contain salt crystals, salt blocks or rhizomes of salt-containing plants, and can be used in accordance with the provisions of Table 1 8 of Appendix I of the Code for Construction and Acceptance of Earthwork and Blasting Engineering.

2 Main Tools.

1) Shipping earthmoving machinery includes: bulldozers, dump trucks, bulldozers, scrapers, half-bucket trucks, etc.

2) Rolling machinery includes: hand rolling, sheep foot rolling and vibrating rolling, etc.

3) General tools are: frog or diesel tamping machine, trolley, shovel (flat and pointed two kinds of m steel tape measure, 20 lead wire, rubber tube, etc.).

3 Operating conditions.

1) Before construction, parameters such as the control range of moisture content of fill soil, the thickness of virtual paving and the number of compaction times should be reasonably determined according to the characteristics of the project, the type of fill soil, the requirements of compactness, the construction conditions, etc.; Important backfill earthworks, the parameters of which should be determined by compaction tests.

2) before filling, should be filled with the base and completed engineering inspection and intermediate acceptance, qualified to make a record and acceptance procedures.

3) Before construction, the layout of horizontal elevation signs should be done. For example, horizontal pile slings are nailed every 10m on the edge of the foundation pit or ditch, or standard elevation points are found on adjacent fixed buildings. Horizontal piles can also be nailed every ten meters or so on a large area.

4 Operating process.

Process; Substrate cleaning, soil inspection, layered soil paving, rolling and compaction, leveling acceptance.

1) Before filling, the garbage or tree roots and other debris and caves on the substrate surface should be disposed of and cleaned up.

2) Inspect soil quality: check whether the moisture content of various soil materials is within the control range. If the moisture content is high, measures such as turning loose and cooling can be used; If the moisture content is low, pre-watering and wetting measures can be used.

3) The fill should be paved in layers. The thickness of each layer of soil should be determined according to the soil quality, compactness requirements and machine performance. or according to Table 2. When rolling, the wheel (ramming) traces should overlap with each other to prevent pressure leakage and tamping.

Every project will have a backfill to a greater or lesser extent.

The underground part needs to be backfilled after the construction is completed; Before construction, leveling the site may require backfill and so on.

I think. What you want to ask is how to judge whether a soil layer is backfilled, generally the backfill is relatively loose, high moisture content, small compactness, uniform particles, but some backfill, after several years of compaction. The above features are not obvious, and it is necessary to look at the local geological history.

The easiest and most formal way is to ask the Survey Institute to take a look.

Backfill refers to the soil that is excavated for a certain need, and then filled back for some reason, this kind of soil is called backfill.

Kiss! Hello, I'm glad to answer your <>

The test to be done for the pro-backfill is as follows: for the compaction coefficient of the backfill compactness (compaction coefficient: the ratio of the measured dry density of the backfill to the maximum dry density.

1) The volume of trench and foundation pit backfill is calculated by subtracting the volume of buried objects (including foundation cushion, foundation, etc.) below the design outdoor floor. Trench, foundation pit backfill engineering quantity = excavation volume - outdoor floor below the buried foundation, cushion, etc. accounted for which volume of the body wheel (2) the center of the backfill, calculated according to the area between the main walls multiplied by the thickness of the backfill. The backfill in the center of the house refers to the backfill between the outdoor floor and the indoor ground cushion, also known as the indoor backfill.

The amount of backfill in the center of the house = the net area between the main walls * the thickness of the backfill = (the floor area of the ground floor - the area occupied by the main wall) * the thickness of the backfill = (in S1-L * the thickness of the outer wall - inside L * the thickness of the inner wall) * The thickness of the backfill in the formula - the distance between the design outdoor floor and the indoor ground cushion. (3) The volume of trench backfill of the pipeline is calculated by subtracting the volume of the pipe diameter from the volume of the cut. If the pipe diameter is less than 500mm, the volume occupied by the pipe will not be deducted; When the pipe diameter exceeds 500mm, the volume of the pipe shall be deducted according to the following table.

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Do you have any other questions?

Summary. Hello, I am glad to answer for you: the project is generally divided into an inspection batch, when the amount of work is large, it should be divided according to the material, process and construction site, and the same material, process and construction site are divided into an inspection batch every 500.

In short, under normal circumstances, the division of the foundation groove earthwork backfill inspection batch: should be divided into an inspection batch, but when the backfill engineering is discontinuous or the engineering quantity is larger, it can also be divided into a number of inspection batches, but should not be too much.

Think about my earthwork backfill project, how to divide the backfill inspection batch?

Hello, I am glad to answer for you: the project is generally divided into an inspection batch, when the amount of work is large, it should be divided according to the material, process and construction hunger or part, the same material, process and construction site every 500 divided into an inspection batch. In short, under normal circumstances, the division of the foundation groove earthwork backfill inspection batch:

It should be divided into an inspection batch, but when the backfill project is not continuous or the amount of work is large, it can also be divided into a number of inspection batches, but it should not be too much.

Earthwork backfill is the fill of construction projects, mainly including foundation filling, foundation pit (preparation of rough file groove) or bench pipe ditch backfill, indoor floor backfill, room imitation chaos outside the site backfill leveling, etc.

For the backfill on both sides or around the underground facilities project (such as underground structures, ditches, pipeline ditches, etc.) and the upper part of the backfill, the underground defective project should be inspected first, and the backfill can only be carried out after the acceptance procedures.

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The large-scale site earthwork backfill, with an area of about 2.5 million square meters and a thickness of about 20 meters.

Hello, the project is generally divided into an inspection batch, when the amount of work is large, it should be divided according to the material, process and construction site.

I hope mine can help you, if you are satisfied with my service, please give a thumbs up, I wish you all the best!

When making a foundation, we usually need to carry out earthwork excavation and backfilling, so what kind of project does earthwork backfill belong to? Next, I will briefly introduce it to you.

First, what kind of project does earthwork backfill belong to?

According to the relevant provisions of the heavy construction quality acceptance standard of the construction project, the earthwork backfill belongs to the sub-division of the earthwork division under the foundation and foundation engineering of the earthwork division of the sub-division of the non-supporting earthwork. Earthwork backfilling refers to the filling of underground pipeline trenches and other engineering projects. Before carrying out earthwork backfilling, we should check whether the quality of the underground engineering that needs to be backfilled meets the requirements.

Second, what to pay attention to in earthwork backfill.

1. Before earthwork backfilling, we should ensure that there is no debris in the foundation pit. If the construction waste in the foundation pit is not cleaned up and backfilled, then it is easy to have an unstable foundation, and it will also cause some pollution to groundwater. In addition, debris is not allowed in the backfill.

2. When backfilling, we also need to check whether the moisture content of the backfill meets the requirements, when the clay is used as backfill, the moisture content should be about 19%-23%, and the moisture content of the sand should be kept at about 8%-12% and so on. If the water content of the backfill is too low or too high, it will cause the backfill to be unable to be compacted and compacted, and the ground is easy to crack and collapse.

3. When backfilling, we can not use backfill to fill all the foundation pit and then tamp it. The backfill should be laid in layers and tamped, if we use machine tamping, then the thickness of each layer of backfill should be about 20-25 cm. We can not pour the backfill with water, so that the backfill is compact, this tamping method will have a safety impact, affect the safety of the building and so on.

After the foundation pit is filled with backfill, we should check whether the ground is flat, and the uneven places should be repaired in time.

Earthwork backfill is the filling of construction projects, mainly including foundation filling, foundation pit (groove) or pipe ditch backfill, indoor floor backfill, outdoor site backfill leveling, etc.

For the backfill on both sides or around the underground facilities project (such as underground structures, ditches, pipeline trenches, etc.) and the upper part, the underground engineering should be inspected first, and the backfill can only be carried out after the acceptance procedures.