Erection of clean water tank

Contents

1. CHARACTERISTICS OF THE STRUCTURE UNDER CONSTRUCTION

2. MANUFACTURING AND INSTALLATION TECHNOLOGY

WORKS

3. DEFINITION OF COMPOSITION AND SCOPE OF WORK, PREPARATION OF LABOR AND MACHINE TIME COUNT STATEMENT

4. SELECTION OF INSTALLATION METHOD OF STRUCTURES AND

INSTALLATION CRANE

5. WORK SCHEDULE

6. QUALITY CONTROL OF WORKS PERFORMED

7. MOUNTING CRANE ATTACHMENT AND DEFINITION

HAZARDOUS AREAS

8. TEMPORARY ROAD DESIGN

9. ORGANIZATION OF ACQUIRED WAREHOUSES

10. DESIGN OF TEMPORARY BUILDINGS AND STRUCTURES

11. POWER SUPPLY DESIGN

12. . SITE LIGHTING

13. WATER SUPPLY AND SEWERAGE DESIGN

14. TECHNICAL AND ECONOMIC INDICATORS ON THE CONSTRUCTION OF A GIVEN FACILITY

LIST OF LITERATURE

APPLICATION

1. characteristics of the structure under construction

Tanks used at water supply and drainage facilities are divided into two groups according to their purpose: for accumulation and storage of water in drinking and industrial water supply systems and for collection of treated and untreated waste water and sediments in complexes of treatment facilities. The clean water tank is designed to store a certain amount of water and create a head at a number of consumers in case of shutdown of the system.

Capacitive structures shall meet the following basic requirements: have dimensions, shape and equipment meeting optimal technological conditions; be practically waterproof; ensure minimum resources of construction materials, labor and cashless costs; ensure the possibility of performing the largest share of construction and installation work using machines and mechanisms, etc.

In this course design, a closed reservoir of pure water of rectangular shape in plan is adopted. Prefabricated walls are mounted from wall panels of beam type with dimensions of 4.2 × 3 m. The tank coating is designed from ribbed typical plates with dimensions of 1.5 × 6 m, resting through a beam on columns with a section of 400 × 400, which in turn rest on prefabricated foundations.

2.technology of production and installation

WORKS

Before the start of the main works on the pit installation, preparatory works are carried out, which include:

1. devices of roads, for transportation of materials. We arrange roads with two-way traffic 6 m wide. Cover for temporary roads on dry sandy soils is arranged by filling loam with a layer of 0.4m.

2. drainage devices. Drainage is necessary to protect the pit from flooding by storm and meltwater. To remove them, we arrange drainage devices in the form of ditches and trays. Water from them is taken to depressed places far from our building.

3. power supply.

4. creation of sites for storage of structures.

The first stage in the construction of rectangular reservoirs begins the excavation of the pit. On site it is necessary to remove the fertile vegetation layer in accordance with the dimensions specified in the design and put it in dumps for further use in the restoration and improvement of the construction site. Removal of fertile layer is performed by bulldozer of DZ18 grade. Technical characteristics of the bulldozer

Dump dimensions, mm

- width 3970

- height 1000

Maximum depth of oval, mm 350

Dimensions, mm

- length 5500

- width 3970

- height 3040

Weight, t 13.9

To bring out the main layout axes or to build external layout networks of the structure on the construction site, a layout network with dimensions of sides of 100 m is first created. The main layout axes of structures and on-site utility networks are fixed by geodetic signs in the form of a metal rod with a length of 57cm, clogged into the ground by 50cm.

Prior to the start of excavation works, representatives of the construction organization together with representatives of the customer check the correctness of the breakdown of the structures in kind and draw up the corresponding act with the addition of breakdown diagrams to it.

The excavation of the pit on the terrain is started with fixation of the con-tours of its brow and bottom with rings, using, for this purpose, mutually perpendicular extreme axes of the structure according to a survey geodetic scheme and geometric dimensions of the excavation. After that, around the future pit at a distance of 3 m from the brow, a cover is installed, consisting of wooden posts dug into the ground and fixed to them strictly on the same level of rack-boards. On the upper edge of the boards the axes are taken out and fixed with nails or hairlines. Periodically pulling axial wires along the cover, with the help of plumbs the accuracy of the pit passage is controlled, in the future axial wires are used for the structure base device.

Soil development in the pit is carried out by an excavator - dragline brand

EO-5111. Development is carried out with the excavator moving along the pit berm with digging of soil below its parking level. The developed soil is poured into a dump, which can be located within the construction site, and excess unnecessary for backfilling is loaded onto the transport. As a transport, a MAZ525 auto dump is used. Technical characteristics of the excavator - dragline:

Capacity of ladle with solid cutting edge 1.0 m

Maximum unloading radius 12.2m

Highest unloading height 6.1m

Maximum digging depth for trenches 9.4m

Development is carried out by two end penetrations when dragline is moved in a straight line.

After excavation of the main volume of soil by excavators, it becomes necessary to refine the soil in the pits, since its bottom must be planned and prepared for the construction of the structure. The bottom of the pit is cleaned with the help of a bulldozer, soil damage left by the excavator is cut off. The bottom is cleaned under the specified elevation.

After developing the pit and grinding its bottom, they usually go to work on the construction of crushed stone and concrete preparation of the bottom of the capacitive structure. These works include: the device of crushed stone and concrete preparation with leveling cement bracing, as well as the device of the concrete bottom of the structure with waterproofing and protective cement bracing. Crushed stone preparation device is made with thickness of 100 mm, crushed stone is delivered to pit by means of vibro-crushed stone, which are loaded with crushed stone directly from car dump trucks.

Prior to concrete preparation, formwork is made along the perimeter of the structure. Concrete mixture is laid with strips 6 meters wide (through one) using SB126A auto concrete pump and compacted with surface vibrators of IV91A grade.

Then bottom is waterproofed from reels of brizol. The waterproofing is made adhesive, and the insulating surface of the leveling brace must be even and well dried. Three-layer waterproof roll carpet is glued onto hot mastic. The rolls are sticked in the same direction for all layers, observing their overlap 10... 12 cm with careful sealing and displacement of longitudinal seams by 25... 30 cm. Then a protective brace is arranged on top of the finished insulation coating from cement sand mortar with a thickness of 30 mm. Condense a cement coupler with CO163 brand vibrolaths on the beacon-type laths stacked at distance 2... 3 m one from the other .

Bottom formwork consists of formwork along external perimeter of bottom, formwork of slots of seats for installation of panels. Bottom formwork is arranged from pre-made boards and separate formwork blocks, which is especially advisable in cases of complex shape of the bottom of structures. To strengthen the bottom, reinforcement nets made of thin reinforcement steel with a diameter of 5... 8 mm and a length of up to 20... 300 meters are used and rolled into rolls for ease of transportation, loading and unloading. On the object rolls are turned, pulled and laid in the design position.

Concreting of the bottom is carried out using SB126A auto concrete pump. As the dimensions of the structure are quite large, then concreting is carried out through the strip with subsequent filling of the left gaps after the interval sufficient to achieve the strength of the previously laid concrete of at least 1.5 MPa. After casting strength is set by concrete, formwork is disassembled.

Installation works are carried out separately, when the crane establishes structures of the same type in one penetration, the crane moves along the pit berm. Before installation of prefabricated reinforced concrete structures, they are laid out in the area of the installation crane. Constructs do not lay out all at once. First the foundation and columns, and after their installation - beams and slabs. Passage for vehicles is left between stacks and unloading crane.

First, they arrange foundations. On the foundation, the middle of the side faces of the lower stage is marked with risks, which makes it easier to reconcile the foundations when they are installed on the basis. The position of the foundations in the plan is checked using theodolite, and the correspondence of the elevations of the foundations and the bottom of the cups is lower than the previously established temporary benchmarks. Installation is performed by ICG-40 crane

Columns and beams are laid out along the pit in stacks up to 1.5 m high; coating plates - in stacks of six pieces; wall panels - in cassettes at the edge of the pit, since they are the heaviest.

Installation of columns is carried out in adjusted cups, according to layout axes using a crane. Columns are installed for preparation made of fine-grained solution of grade 100 with height of 50 mm. Installation is performed by MKG40 valve. Temporary attachment of the column is carried out using conductors. After installation of the column, joints are closed with fine-grained concrete mixture.

After installation of the column and the required strength, the beams are mounted in the joints. Installation is performed by MKG40 valve. Attachment of beams to columns is performed by welding to embedded parts with following grouting of joints with concrete mixture. Concreting is performed in formwork installed directly at joints.

Wall panels are mounted from the pit berm. Mating of wall panel with bottom is performed by their sealing into slot slot. Leveling layer of solution is installed in slot. Next, embedded parts of wall panels are welded. After panels attachment the slot is sealed with concrete of class B25 with concrete compaction by vibrator IV17.

The butt joint of wall panels is prismatic. The width of the prismatic joint is 200 mm, frozen by conventional concreting, with concrete of class B25.

Then the coating plates are installed. After laying of each plate its embedded parts are welded to embedded parts of beam at least in three points. Installation is performed by MKG40 crane.

To protect embedded parts and reinforcement outlets from corrosion during erection of structures, they are coated with anticorrosive varnishes and paints not later than three days after welding works completion. Before applying protective coatings, surfaces of embedded parts are cleaned from slag and carbon black formed during welding to metallic gloss with steel brushes and welding slag is removed.

Next, a monolithic concrete belt is arranged along the perimeter of the tank and a cement protective brace with a thickness of 30 mm along the floor slabs, as well as insulation of walls and coating slabs.

Hydraulic testing of tanks is carried out in order to check the strength of their structures and determine the degree of watertightness of walls and bottoms.

Hydraulic testing of the structure is performed after completion of all construction and installation works, except backfilling, which should be performed only after successful testing and elimination of all observed defects. The structure should be tested after the concrete has reached the target strength of the critical joints. The structures shall be thoroughly inspected before testing. In the absence of defects and deviations from the design, an act on the readiness of structures for testing is drawn up. The certificate is signed by representatives of the customer and the construction and installation organization. Fill the structure with water slowly, at a speed of not more than 0.5 m/h (along the height of the wall) and necessarily after the installation of a temporary water drain system. Before filling it is necessary to tightly close valves at inputs and gate valves in control chambers. After start of filling make sure that there is no water leakage through gate valves. During the test the hatches on the floor shall be closed and sealed. During the test it is necessary to keep the technical personnel on duty. To monitor the water level, a wooden rack is installed at the entire height of the structure. Measurement of water level during determination of its losses shall be performed by floats suspended on deflectors of the Maximov system (or by other equivalent methods) at least at two points of the structure. During the period of filling the tank with water, access of people and transportation at a distance of up to 12 m from the structure should be stopped. Testing of reinforced concrete capacitive structures for waterproofness is allowed to begin no earlier than 5 days after their filling with water. Prior to the start of the control determination of filtration losses from the structure. It is necessary to ensure that the daily decrease in the water level in it does not increase.

The structure is recognized as having passed the test if the water loss in it per day does not exceed 2l on 1m2 of the wetted surface of the walls and bottom; through wall panels and especially through joints there is no outlet of water streams; temperature or deformation joints show no signs of leakage, and no soil moistening in the base was detected.

Backfilling with collapsing is performed immediately after erection of reservoir and its hydraulic test, when structures of above-ground part do not prevent operation of machines from pit berm. Soil by means of bulldozer DZ18 is supplied to the working map within the area limited by underground structures and leveled.

The necessary degree of soil compaction and high quality of backfills in practice are provided by layer-by-layer soil compaction provided that it is filled with layers of the same thickness. Each filled layer of soil is compacted with equal number of passes for one trace. Soil is compacted by DN31A grouting machine.

The final layout and restoration of the plant layer is carried out with the help of bulldozer DZ18.

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