Outdoor billboard construction scheme _ Outdoor billboard installation scheme

Construction scheme of outdoor billboard

I. Overview of the Project:

1. The outdoor billboard is 9m high and 3m wide, with angle steel frame, 2mm aluminum plate on the surface, bent and welded, and painted.

2. Billboard advertising space, the surface is 5mm transparent resistor board, with 3mm opalescent resistor board built in, with lamp box in the middle, and the outer frame is stainless steel, which can be changed. The built-in fluorescent lamp can emit light. Logo adopts acrylic absorbent board with built-in led light source.

Second, the scope of contracting:

A billboard 9 meters high and 3 meters wide. Aluminum plate is installed on the surface of angle steel frame, which is bent, welded, finely polished and painted. Production of advertising space in billboard (advertising space of billboard, the surface is 5mm transparent resistor board, with 3mm opalescent resistor board built in, with lamp box piece in the middle, and the frame is stainless steel, so the picture can be changed. The built-in fluorescent lamp can emit light. ), and installation.

Third, the foundation construction:

1. Construction technology sequence

1, pay-off

2. Foundation pit excavation

3. Earthmoving

4 foundation pit enclosure

5, limb protection

6. Foundation treatment

7. Substrate treatment

8. Cushion concrete construction

9. Pay off

10, axis acceptance

1 1, steel binding

12, acceptance

13 for templates

14, acceptance

15, pouring concrete

16, maintenance

17, backfill

First, the preliminary preparation for digging a pit and groove:

Including (1) Party A's on-site "three links and one leveling" and greening and transplanting;

(2) Collect the location data of the existing underground pipe network to avoid damage;

③ After Party B's workers and machinery enter the site, they will jointly define the work area with Party A;

(4) Positioning and setting out, determining the axis position according to the positioning, and drawing the excavation sideline of the foundation pit (groove) with lime;

B, site excavation:

1. In this project, if the construction site has convenient traffic and the ground is open, it is determined that excavator excavation is the main method, and the groove is cleaned manually.

2, earthwork placement and excess earthwork transportation.

3. If the construction site is open, soil collapse should be prevented during foundation pit excavation. At the initial stage of excavation, slope excavation should be carried out at the elevation of 1- 1.5m to prevent safety accidents caused by soil wall collapse.

4. The key points of excavation construction should be from top to bottom, from deep to shallow, horizontally segmented and layered. First, excavate the fill to verify the depth, then excavate the silt to the clay layer to measure the elevation and confirm the depth.

5, foundation pit (groove) completion acceptance.

C, concrete foundation construction:

1, make steps in the foundation section, the height of the steps is greater than 300MM, then clean the bottom of the pool, and then lower the gravel cushion material by 300mm;

2. Release the foundation axis and sideline on the foundation cushion, and the steel bar worker will bind the foundation steel bar. The anchor bolt will overlap the reinforcement to correct the position and fix it, and then check the reinforcement.

3. After the steel bars pass the inspection, the formwork prepared in advance shall be set up according to the line (the formwork is mainly made of laminated plywood with light weight and small area, which is produced and installed on site. Steel pipe frame or angle steel welding support reinforcement. ) first support the lower template, and then support the upper template. Formwork should be firmly supported to avoid slurry leakage and deformation when pouring concrete. The wooden formwork was watered and wetted.

4. C20 commercial concrete will be used, and the concrete will be transported directly to the pit by truck. Concrete workers will vibrate the concrete with a tamping rod to avoid vibration leakage.

5. After concrete pouring, sprinkle water for curing. After reaching a certain strength, dismantle, check and backfill.

6. After the foundation pit is completed, clean the threads of exposed anchor bolts and wrap them in plastic bags after filling with engine oil to prevent the threads from being damaged. Precast members such as anchor bolts, wall protection facilities and flanges shall be completed before foundation pit excavation. Materials, components, construction machinery and labor should meet the construction requirements.

Four, steel frame construction:

The steel frame structure is welded and hauled to the site in different places, and the crane hoisting scheme is adopted.

The steel frame structure enters the site for preliminary iron red corrosion protection, and the flange angle rib plate and the connecting square steel plate are welded to the steel frame structure. After welding, remove the coating of the weld and carry out anti-corrosion twice. Steel frame structure should be painted with topcoat two days before hoisting. So as to ensure that that paint surface of the steel frame structure is clean.

Five, license and support steel beam welding:

The billboard surface adopts the scheme of combining welding finished products in different places with crane hoisting.

1. Billboard surface materials are manufactured in different places, anticorrosion, blanking, assembly welding and supporting cross arms.

2. The crane supports the deck steel frame, the supporting cross arm and the deck center column, and positions, combines and welds the deck steel frame, the supporting cross arm and the deck center column steel structure.

3. After the assembly welding of the signboard steel structure is completed, check and remove the weld coating, and carry out anti-corrosion and leak-patching.

Six, column, deck steel structure, deck steel structure installation galvanized sheet all ended, and after written acceptance.

1. Hoisting. Use 1 25T crane to hoist in two parts:

2. Hoisting safety measures: The hoisting operation is strict with the environment. Before hoisting this project, attention should be paid to the weather change and weather forecast. When the wind speed does not exceed Grade 4 (including Grade 4) and the job site is normal, the crane will not sink after entering the job site. Then determine the hoisting time and make the hoisting plan. A 25T crane was designed to prevent sudden gust during the hoisting of steel frame structure.

Seven, the big frame assembly is divided into two parts, and the safety measures are set to three-in-one scheme.

These two parts are divided into:

1, steel structure hoisting;

2. Hoisting the steel structure on the deck;

These three parts are:

1, crane parts and crane drivers;

2. Steel structure lifting points and lifting point components;

3. Lifting points and lifting point components of steel structures on deck;

Integration is as follows:

Hoisting should be carried out from crane hoisting components to steel structure hoisting point components, and then to deck steel structure hoisting points and hoisting point components, and hoisting operations should be started under the condition of ensuring safety.

Precautions for personnel in hoisting operation:

1. Workers entering the construction site must wear safety helmets;

2. When the crane enters the hoisting state, no workers are allowed to stay under the boom;

3, after the completion of steel structure hoisting, the operator did not completely close the anchor bolts and nuts, steel structure shall not be separated from the crane;

4, the staff must wear a helmet belt when climbing high altitude, the implementation of aerial work and use safety rope at the same time, in case of accidents.

Error component installation security:

1, strictly check the lifting parts of the crane.

2. Strictly check the steel structure lifting point components.

3. Strictly enforce the lifting point components of check card steel structure, and reinforce the problematic lifting point components to ensure that the lifting point does not leave potential safety hazards.

Safety failure of members' hoisting personnel:

The lifting point and lifting point of the steel structure should be set on the top of the steel structure and the opposite steel structure, so as to keep the steel structure as balanced as possible when the crane is lifting. The steel structure should be lifted off the ground, and the operator should vertically align the steel structure with the foundation surface. At this time, the operator needs to assist in the operation. Then use a crowbar to align, align accurately and timely command the crane to descend, and allow the crane to evacuate after the connection point is welded firmly.

Matters needing attention during installation:

1, steel structure hoisting. When hoisting the steel frame structure, attention should be paid to accurately align the wires to ensure that the wires are not bitten. Hang in place, take up and tighten the line evenly to ensure that the line is in place. Then close the second nut.

2. Improve the metal structure of the billboard. When hoisting the metal-faced steel structure of advertising space, attention should be paid to the firm lifting point and the smooth and parallel rise. When it rises to a certain height, it will be hoisted evenly to the joint of steel frame structure, and the ground personnel will cooperate with it to aim at the joint and hoist it accurately. After the hoisting is in place, the ground personnel will adjust the orientation of the billboard. At the end of the fixed point, the welder ascends the upper end of the column for welding operation. Weld firmly and lift. When the crane is evacuated, the welder will strengthen the welding and beautify the docking, and other workers will clean up the job site. Welding operation, site cleaning and closing. Professionals will review the completion of the completed billboards.

Third, the time limit for a project:

The construction period from Party B's commencement date to completion is 13 days.

Construction quality assurance measures: strictly control materials, pay close attention to welding technology and foundation construction. Generally speaking, stage construction and stage acceptance are implemented. Step by step operation plan.

Construction safety measures: the staff are professional, safety protection articles are in place, warning signs are set on the job site, and electricity consumption is strictly controlled.

Construction progress plan: formulated after the workers arrive at the construction site.

Remarks: If this construction scheme is inconsistent with the design basis of this construction scheme during construction, the actual construction scheme shall prevail.

Article 4 Project quality, inspection and acceptance:

1, production requirements:

(1) Comply with the relevant provisions of CECS 148: 2003 Technical Specification for Steel Structures of Outdoor Advertising Facilities and GB500 17.

(2) When bolts or welds are used to connect with the original building structure, the overturning resistance of the connecting bolts or welds shall be calculated according to the overall structure, and the calculated stress of the bolts or welds shall not be greater than 75% of the design value of the bearing capacity.

(3) The layout of connectors should be coordinated with the layout of roof column network, and can directly bear the pressure, pull-out force and shear force from the billboard structure.

④ Measures must be taken to prevent the invasion of direct lightning, induced lightning and lightning waves, and the grounding system of billboard structure should form equipotential connection.

⑤ Billboard steel structure must be anticorrosion.

2. Material requirements: steel (angle steel, steel pipe) for billboards exposed to outdoor environment.

The minimum wall thickness of channel steel and flat steel shall not be less than 3mm, the leading steel for keel shall not be less than _80*8, the angle steel for welding structure shall not be less than _56*36*4 or _40×4, and the angle steel for bolt connection shall not be less than _50×5. The steel pipe for installing the lamp tube is not less than 20 * 20; The light box panel adopts a resistance board, with a 3mm ivory resistance board inside and a 5mm transparent resistance board outside. The light source is ordinary T4 fluorescent tube, and the LOGO part is made of acrylic material with built-in LED light source.