Technology of soil development, displacement and compaction with concreting elements

Contents

Contents

Source Data

Part I

1. Define Scope of Work

Table 1. Characteristics of this soil

(sand without impurities)

1.1 Pit sizing

1.2 Calculation of pit volumes and entry trench (ramp)

1.3 Development of soil damage

1.4 Calculation of backfill volume

Table 2. List of earthworks

1.5 Concrete Work Scope

1.6 Leveling volumes

1.7Compaction volumes

2. Selection of sets of machines and equipment

2.1Selection of a set of machines for soil development

2.2 Selection of leveling and compaction machines

2.3 Selection of a set of machines for concreting

Table 3. Composition of accepted sets of machines and equipment

Table 4. Calculation of labor costs

Table 5. Schedule

3. Organization and production technology

construction and installation works

4. Quality control of works

5. Technical and economic indicators

6.Safe Instructions

Part

List of literature

2. Selection of sets of machines and equipment

2.1Selection of a set of machines for soil development

All production processes at the construction site are performed by several sets of machines organized in a single flow. A separate set includes: a driving machine, in this case an excavator, and a driven one - a car truck.

The driving machine is a single-bucket excavator EO4321 with a straight blade, hydraulic drive, Vk = 0.8 m3.

Technical specifications:

Ladle volume - 0.8 m3.

The largest digging radius Rk is 8.0 m.

The highest digging height Nk is 7.9 m.

The highest height of unloading Nv is 4.8 m.

The unloading radius at the highest unloading height Rc is 4.9 m.

According to the volume of the ladle 0.8 m3, we choose a car dump truck with a lifting capacity of 10 tons (KrAZ222).

Technical specifications:

The mass of the transported cargo is 10000 kg.

Size: 819026502720 mm.

Body volume (without extension) - 8 m3.

The maximum speed is 68 km/h.

3. Organization and production technology

construction and installation works

When designing the excavation face, it is necessary to solve the following problems:

determine the shapes and dimensions of all elements of the excavation face and all excavation penetrations;

split the cross section of the developed recess into excavating penetrations, set their number and dimensions;

Establish transport routes and their parking areas under loading;

Adopt the pit bottom cleaning scheme in conjunction with the excavator soil development sequence.

Designed borehole shall meet the following requirements:

minimum number of penetrations;

the height of the face shall be sufficient to fill the ladle in one draw;

minimum angle of boom rotation.

For excavator EO-4321:

Largest digging radius

Smallest radius

Value of working movement

Construction of the earthwork development scheme is given in the drawing.

4. Quality control of works

Assurance of quality control of construction works is achieved by systematic monitoring of performance of each production process. Internal operational control is carried out during the work.

1. Quality control of earthworks.

The main document when performing quality control of work is the operational control scheme, which performs: a sketch of an earthen structure with a leader of permissible deviations; list of operations to be monitored; control composition; method and time.

During arrangement of pits the following is checked:

a) horizontal reference;

b) correct distribution of axes;

c) vertical elevations;

d) accidental soil overruns.

Control is carried out using theodalite, leveler, roulette, cord. On the completed part of the earth structure (in part for hidden works), they are..., which, together with as-built drawings, soil test results, work logs and other documentation, are presented during the technical delivery of the object reception.

2. Quality control of reinforcement works.

Rebar work is classified as hidden. Each deviation from the design - replacement of the diameters of the reinforcement, its mutual location is necessarily fixed.

Before concreting, all installed reinforcement structures are inspected, checked, compliance of dimensions with drawings, location, diameter and number of rods, distance between them, correct arrangement of joints, position of liners.

Then an act is drawn up for hidden work.

3. Quality control of concrete works.

a) directly during concrete works the mixture mobility is monitored. Inspection shall be carried out at least twice a shift in stable weather and every 2 hours in changing weather;

b) compliance of geometric dimensions of foundations with the dimensions on the drawings is checked;

c) verifying vertical and horizontal surface of the foundation. Deviation in height not more than 20 mm is allowed. Foundations are inspected for chips and defects.

d) to control the strength of foundations, samples are made for 3 samples in the form of a cube of 15x15x15 m. Concrete strength should be more than 90% of the grade.

4. Control of soil compaction quality.

a) moisture content of compacted soil is controlled;

b) the thickness and degree of soil compaction, the rhythm of machines operation are controlled.

Soil density is checked in laboratories.

5. Control of formwork quality.

a) inspection and instrumental check of formwork elements when it enters the construction site at least after 10 cycles

b) mounted formwork, supporting structures are accepted according to the act, where rigidity and invariability of the structure as a whole is checked, correctness of the formwork installation, embedded parts is checked. During concreting, the condition of the formwork is monitored by the attachment.