Scope of Technical Specification for Outdoor Billboards 1

This standard specifies the technical requirements for the design, construction, acceptance and quality inspection of outdoor billboard structures.

This standard is applicable to various forms of outdoor billboard structures, including floor-standing billboards and attached billboards.

2 normative reference documents

The terms of the following documents become the terms of this standard by reference. For dated reference documents, all subsequent modifications (excluding errata) or revisions are not applicable to this standard. However, parties who have reached an agreement according to this standard are encouraged to study whether the latest versions of these documents can be used. For undated reference documents, the latest edition is applicable to this standard.

Gb/t70-1988 carbon structural steel

Gb/t1228 ——1991high strength large hexagon-head bolts for steel structures.

Gb/t1229 ——1991high strength hexagon nut for steel structure.

Gb/t1230 ——1991high strength flat washer for steel structure.

Gb/t1231-1991technology of high-strength hexagon bolts, hexagon nuts and washers for steel structures.

Gb/t1591-1995 low alloy high strength structural steel.

GB/T 3632-1995 Torsional shear type high strength bolt connection pair for steel structure

Technical requirements for torsion-shear high-strength bolt connection pairs of steel structures

Gb/t 5117—1995 carbon steel covered electrode.

Gb/t 5118-1995 low alloy steel covered electrode.

GB/T5780—2000 Hexagon head bolts Grade C

Hexagon head bolts

Gb/t14957 ——1994 steel wire for fusion welding.

GB50007—2002 Code for Design of Building Foundation

GB50009—200 1 Load Code for Building Structures

GB500 10—2002 Code for Design of Concrete Structures

Gb50011-2001code for seismic design of buildings.

GB500 17—2003 Code for Design of Steel Structures

GB500 18—2002 Technical Specification for Cold-formed Thin-walled Steel Structures

GB 50057- 1994 Code for Lightning Protection Design of Buildings

GB50204—2002 Code for Acceptance of Construction Quality of Concrete Structure Engineering

GB50205—2002 Code for Acceptance of Construction Quality of Steel Structure Engineering

GB/T50328—200 1 Code for Filing and Arrangement of Construction Engineering Documents

Gbj16 ——1987 code for fire protection design of buildings (with provisions) (200 1 version)

Gbj107-1987 concrete strength inspection and evaluation standard

Gbj135 ——1990 code for design of high-rise buildings.

JGJ 94- 1994 Technical Specification for Building Pile Foundation

CECS 28- 1990 Code for Design and Construction of Concrete Filled Steel Tubular Structures

3 Terms and definitions

The following terms and definitions apply to this standard.

3. 1

Outdoor billboard

Advertising buildings set up beside roads or on buildings and structures. Billboards include supporting structures, lighting facilities, electrical appliances and necessary equipment.

3.2

Floor billboard

The billboards on the ground include single, double and multi-column billboards and billboards supported by multiple trusses. It consists of panel structure (including light box), columns and foundation.

3.3

Attached billboard

Refers to billboards reliably fixed on buildings and structures, including wall billboards and roof billboards.

3.4

wind loading

Wind power on billboards or buildings.

3.5

Effect of action

Internal force and deformation of structure or member caused by load.

4 Classification of outdoor billboards

4. 1 floor-standing billboard

4.2 Attached billboards

Attached billboards include wall billboards and roof billboards.

Wall billboard

It consists of panel structure, walls and connecting parts of buildings or structures.

4.2.2 billboard on the roof

It consists of panel structure, supporting system and connecting parts.

5 outdoor billboard design

5. 1 General

5. 1. 1 This standard adopts the limit state design method based on probability theory, measures the reliability of structural members with reliability indicators, and calculates with the design expression of partial coefficients.

5. 1.2 The load-bearing structure is designed according to the limit state of bearing capacity and the limit state of normal use; All structures or members shall be calculated according to the load design value; For structures or members that need to control the deformation value in use, deformation checking calculation should be carried out, and the corresponding load standard value should be adopted in checking calculation.

5. 1.3 The safety level of outdoor billboard structure can be divided into three levels:

A) The safety level of outdoor billboards with service life of 65,438+00 and above shall be Grade I;

B) Set the safety level of outdoor billboards for more than 5 years as Grade II;

C) Outdoor billboards with a service life of no more than 5 years shall have a safety level of Grade III.

5. 1.4 The bearing capacity design of outdoor billboard structural members shall adopt the following limit state design expressions:

γ0s≤S………（ 1）

R=R（？ c，？ （2）

Among them:

γ0—— the importance coefficient of structural members. For billboards with safety level of 1.1∽1.2, billboards with safety level of 2 shall not be less than 1.0 and billboards with safety level of 3 shall not be less than 0.9;

S—— combined design value of load effect without considering earthquake action;

R—— design value of bearing capacity of mechanism members;

c，？ —— Strength design value of concrete and steel;

The standard value of αk- geometric parameters.

5. 1.5 For the limit state of normal use, structural members should be checked according to the standard combination and quasi-permanent combination of load effects respectively, and the deformation should not exceed the corresponding specified value. The standard combination and quasi-permanent combination of load effects shall be calculated according to the provisions of GB 50009 and GB 500 1 1.

5. 1.6 For billboards attached, the original buildings or structures should be checked before design, and the structural safety after billboards are attached should be evaluated.

5. 1.7 The setting of outdoor billboards should consider the urban planning, the present situation of municipal public facilities, the surrounding environment and the maintenance conditions after completion.

5. 1.8 The shape of outdoor billboards should be in harmony with the surrounding environment.

5. 1.9 The fire prevention of outdoor billboards shall comply with the relevant provisions of GBJ 16.

5. 1. 10 The design of outdoor billboards shall be entrusted to a design unit with architectural design qualification above Grade B. ..

5.2 materials

5.2. 1 The selection of structural steel for outdoor billboards shall comply with the provisions of GB 500 17.

5.2.2 When using steel products with brands Q235 and Q345, their properties shall meet the requirements of GB/T 700 and GB/T 159 1 respectively.

5.2.3 Cold-formed thin-walled steel shall be used as structural steel for outdoor billboards, which shall comply with relevant provisions of GB 500 18.

5.2.4 covered electrode used for manual welding shall comply with GB/T 5 1 17 or GB/T 5 1 18. The selected covered electrode model should be suitable for the strength of main metals.

5.2.5 Welding wires and fluxes used in automatic welding or semi-automatic welding shall be compatible with the strength of main metals. The welding wire shall comply with GB/T 14957.

5.2.6 Ordinary bolts shall comply with GB/T 5780 and GB/T 5782.

5.2.7 High-strength bolts shall comply with GB/T 1228, GB/T 1229, GB/T 1230+0 or GB/T 3632 and GB/T 3633.

5.2.8 The strength grade, mechanical performance index and quality standard of concrete shall comply with the provisions of GB 500 10 and GBJ 107 respectively.

5.2.9 When the outdoor billboard structure adopts concrete filled steel tube, ordinary concrete can be used, and its strength grade should not be lower than C30.

5.2. 10 When other new materials are adopted, they shall comply with the provisions of existing relevant standards.

load

5.3. 1 The load acting on the outdoor billboard structure can be divided into permanent load and variable load.

5.3. 1. 1 The permanent load includes the influence of structural dead weight, attached dead weight, water buoyancy, soil weight of landing billboard, soil pressure or foundation deformation on the bearing capacity of the structure.

5.3. 1.2 Variable loads include wind load, ice load, earthquake load, snow load, installation or maintenance load, temperature change, etc.

5.3.2 The load acting on outdoor billboards shall be adopted according to the provisions of GB 50009.

5.3.3 When designing outdoor billboards, the following load combinations should be selected according to possible simultaneous loads:

A) Combination Ⅰ: Combination of variable load and permanent load.

B) Combination 2: In the construction stage, the combination shall be made according to the possible construction loads (such as structural self-weight, scaffolding, materials and machinery, crowds, wind, etc.). ).

C) Combination III: Combination of gravity load and earthquake load.

5.3.4 The calculation of water buoyancy shall meet the following requirements

5.3.4. 1 When the checking calculation is stable, the billboard foundation located on the permeable foundation should adopt the buoyancy of the design water level; When checking the foundation stress, only consider the buoyancy of low water level or not consider the buoyancy of water.

When 5.3.4.2 foundation is buried in impermeable foundation, the buoyancy of water can be ignored.

When 5.3.4.3 is not sure whether the foundation is permeable, for other load combinations, permeable or impermeable conditions should be adopted, and the most unfavorable conditions should be taken.

Note: Low water level refers to the water level that is often maintained in dry season.

5.3.5 The standard value of wind load per unit area acting on the height Z of outdoor billboard structure Wk = β gzμ s μ zwo ........................... (3)

Among them:

Wk—— standard value of wind load, in kn/m2;

WO—— basic wind pressure, in kN/m2.

βgz- gust coefficient at height z;

μs—— wind carrier type coefficient;

μz—— Height variation coefficient of wind pressure at height z.

5.3.6 The wind-induced vibration effect caused by pulsating wind should be considered in the structure of landing billboards, which can be ignored when the basic natural vibration period of the structure is less than 0.25s ... The billboards on the building wall should be integrated with the building to consider the influence of wind vibration. The billboard on the roof of a building should not only consider the wind-induced vibration influence of the whole building, but also independently consider the basic natural vibration period of the billboard itself to check its wind-induced vibration influence.

5.3.7 The calculation of earthquake action can refer to GB 500 1 1.

5.3.8 The outdoor billboard structure in Beijing area must be designed for earthquake resistance, especially the roof billboards and wall billboards of high-rise and multi-storey buildings should consider the earthquake action at the same time as the buildings. For the cantilever truss, cantilever beam and other cantilever structures of billboards, vertical earthquake action should also be considered.

5.3.9 When the seismic fortification intensity is 7 degrees and 8 degrees respectively, and the standard value of the static bearing capacity of the foundation is greater than 80kPa and 100kPa respectively, and the height is less than 25mm, the seismic section checking can be omitted, and only the requirements of the seismic structure can be met.

5.3. For the value of10 icing load, please refer to GBJ 135.

5.4 Structural design of outdoor billboards

5.4. 1 The structure of outdoor billboards shall conform to the relevant provisions of GB 500 17, except for special provisions in this standard. When the outdoor billboard column adopts reinforced concrete structure, it should comply with the relevant provisions of CECS No.28.

5.4.2 The strength, stiffness, stability and construction stress of outdoor billboards under various load combinations shall be checked. At the same time, it should comply with the structural regulations and technological requirements.

5.4.3 It should be noted that the selected structure is beneficial to maintenance.

structural design

5.4.4. 1 When the floor-standing billboard structure is made into a single-column beam structure or a double-inclined column structure, it can be analyzed as a cantilever beam structure.

When the billboard steel structure attached to 5.4.4.2 is made into plane truss or space truss structure, its structural analysis condition is plane truss or whole space truss.

When the billboard structure in 5.4.4.3 is made into frame, arch or grid structure, it can be analyzed from the perspective of structural mechanics.

5.4.4.4 slab structure is composed of slab, longitudinal beam and cross beam, and the supporting structure is composed of cantilever beam, cantilever truss or space truss and space grid. All components should form geometric invariants and ensure their strength, stiffness and stability through calculation.

Structural regulation

5.4.5. 1 The selection, arrangement and structure of outdoor billboard steel structure should be convenient for manufacturing, installation and maintenance, and the stress on the structure should be simple and clear, so as to reduce stress concentration. Outdoor billboard steel structure mainly bears wind load, so hollow structure should be adopted to reduce the wind area.

The minimum wall thickness of section steel (steel pipe, channel steel and flat steel) used for outdoor billboards in 5.4.5.2 should not be less than 3mm, the diameter of round steel should not be less than10mm, the angle steel for welded structure should not be less than ∟45×4 or ∟56×36×4, and the angle steel for bolted connection should not be less than ∟50×5.

The outdoor billboard structure in 5.4.5.3 should be provided with a reliable support system according to the structural form and load, so as to ensure the structural integrity.

In 5.4.5.4, billboards are composed of longitudinal beams and transverse beams, which need not only vertical and horizontal support. The top and bottom of the panel can be provided with longitudinal supports, and the left and right ends can be provided with transverse supports. If the panel is long, lateral support should be added in the middle.

Lateral stability should be considered in the support of 5.4.5.5 support plate, and horizontal and vertical supports should be set between multiple supports to ensure the lateral stability of the supports and the overall stability of billboards.

When 5.4.5.6 outdoor billboard panels adopt membrane structure, the design of membrane structure should meet the requirements of membrane structure design standards. The connection between membrane cloth and outdoor billboard structure should be firm and reliable. The fastness and strength of film cloth should meet the requirements of current relevant standards.

Deformation regulation

5.4.6. 1 floor-standing billboard steel structure, under the action of wind load (standard value), the horizontal displacement of the structural apex should not exceed1100 of the height above the ground, and the allowable deflection of the beam is L/ 150(L is the cantilever span).

Under the wind load (standard value), the allowable deflection of the cantilever beam of 5.4.6.2 wall billboard steel structure is L/ 150(L is the cantilever length).

Under the action of wind load (standard value), the allowable deformation of columns and beams of 5.4.6.3 roof billboard steel structure is the same as that of floor-standing billboard steel structure.

5.5 Design of foundation and connecting parts

5.5. 1 The foundation and foundation design of outdoor billboards can adopt GB50007 unless there are special provisions in this standard.

5.5.2 The foundation of outdoor billboards should avoid underground pipelines, and the spacing must conform to the provisions of the safe distance of pipelines.

5.5.3 The foundation selection of floor-standing billboards shall be determined according to the soil conditions and structural requirements of the construction site. The strength of foundation and foundation (including compression resistance, uplift resistance, bending resistance and overturning resistance) should be calculated, and the sliding stability of foundation should be checked if necessary.

5.5.4 When the foundation is below the groundwater level, the buoyancy effect of groundwater on the foundation and covering soil should be considered, and whether the groundwater is corrosive to the foundation should be determined and the corresponding anti-erosion treatment should be carried out.

5.5.5 When the load on the soft soil layer of local foundation is large and concentrated, and the shallow foundation can no longer meet the requirements of the floor-standing billboard structure on the bearing capacity and deformation of the foundation, foundation treatment or pile foundation can be considered. Pile foundation calculation can be carried out according to the provisions of JGJ94.

5.5.6 When embedded parts should be used between the billboard steel structure and the concrete structure, it is forbidden to use friction expansion bolts for anchoring. When installing special embedded parts unconditionally, other reliable connection measures should be taken, but they must be verified by force calculation and test to ensure safety.

5.5.7 For billboard steel structures attached to floors and walls, 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 bearing capacity.

5.5.8 Connection parts of billboards and walls

5.5.8. 1 wall billboards should be attached to the walls of houses or structures and should

Determine or check whether the wall of a house or structure can reliably bear the force transmitted by billboards.

And have the necessary safety reserves.

The connecting parts of 5.5.8.2 wall billboards can be connected with the embedded parts in the columns or beams of the wall by welding, bolts or anchorage, or they can be connected by qualified chemical anchorage and anchorage. Friction expansion anchor is strictly prohibited.

In 5.5.8.3, the connection between the wall billboard and the wall of a house or structure should be checked by 2.0 times of the normal internal force, and measures should be taken to prevent falling objects.

In 5.5.8.4, the buried depth of concrete for supporting bolts or anchors should reach (30∽40)d(d is the bolt diameter), and the installation of anchors should meet the technical requirements of the products used. When the buried depth is not enough, the bolts should be connected by plywood, and there should be a concrete protective layer with sufficient thickness.

5.5.9 Connecting parts between billboard and roof

5.5.9. 1 The layout of the joint of the billboard on the roof should be coordinated with the layout of the roof column network, and should be able to directly bear the pressure, pull-out force and shear force from the billboard structure.

The billboard on the roof of 5.5.9.2 can be connected with the embedded parts in the roof or column by welding, bolts or anchoring, and the load borne by the billboard bracket should be reliably dispersed and transmitted to the substructure.

It is forbidden to use friction expansion bolts to connect the connecting parts of the billboard on the roof of 5.5.9.3, and qualified chemical anchors and anchorage connections can be used.

In 5.5.9.4, the buried depth of concrete for supporting bolts or anchors should reach (30∽40)d(d is the bolt diameter), and the installation of anchors should meet the technical requirements of the products used. When the buried depth is not enough, it can be welded with the beam-column reinforcement, and at the same time, there should be a concrete protective layer with sufficient thickness.

5.6 Lightning protection and grounding

5.6. 1 The lightning protection level of outdoor billboard structure shall be determined according to its installation location and the provisions of GB50057.

5.6.2 The lightning protection devices of outdoor billboard structure (including lightning arrester, down conductor, grounding device, overvoltage protection and other connecting conductors) shall be designed according to the lightning protection environment. Lightning protection design must have measures to prevent the invasion of direct lightning, induced lightning and lightning waves.

5.6.3 When the outdoor billboard is installed on the roof or external wall of a high-rise building, its lightning protection device can be designed in combination with the lightning protection and grounding system of the building.

5.6.4 The steel structure frame and metal panel of outdoor billboard can be used as lightning receptor and down lead of lightning protection device, but they must be welded with lightning protection belt, lightning protection net and down lead of roof and wall.

5.6.5 Independent outdoor billboards should be installed in protected lightning protection areas and inside and outside lightning protection nets, and their steel structure frames, metal panels and steel structure columns should be reliably grounded.

5.6.6 The grounding system of outdoor billboard structure should form equipotential connection.

5.7 Lighting and electricity consumption of outdoor billboards

5.7. 1 Lighting of outdoor billboards shall comply with relevant technical standards.

5.7.2 Lamps, wires and electrical appliances of outdoor billboards shall conform to the technical specifications for outdoor installation engineering.

5.7.3 Wiring of outdoor billboards shall not be exposed on the ground.

5.7.4 Outdoor billboards should be wired according to the requirements of lighting products. Flexible wires and unsheathed cables are used in conduits, trunking or equipment that can ensure the same protection.

5.7.5 The laying of conduits and trunking shall be neat and firm. The total cross-sectional area of wires in trunking shall not be greater than 60% of the net cross-sectional area of trunking; The total cross-sectional area of the conductor in the conduit shall not be greater than 40% of the net cross-sectional area of the conduit; The fixed distance between hoses should not be greater than 1m, and the fixed distance between ends should not be greater than 0.1m.

6 outdoor billboard construction

6. 1 General provisions

6. 1. 1 Outdoor billboard construction should be meticulous, safe, high-quality and civilized.

6. 1.2 Before the construction of outdoor billboard project, the construction plan shall be prepared and implemented according to the construction plan.

6. 1.3 outdoor billboard construction requires process inspection, and the next process can only be carried out after the previous process is qualified.

6. 1.4 The materials used for outdoor billboard construction must have a quality guarantee.

6. 1.5 The structure of outdoor billboards shall comply with relevant provisions of GB50205, GB50204 and CECS28, except for special provisions in this standard.

6. 1.6 The construction and supervision of outdoor billboards shall be entrusted to units with corresponding qualifications.

6.2 Foundation and Bearing

6.2. 1 Before construction, the underground pipelines and underground facilities shall be fully investigated and verified, and the construction can be started only after it is verified.

6.2.2 Before foundation pit excavation, the influence of foundation pit excavation on the safety of nearby buildings shall be investigated in detail, and corresponding preventive measures shall be taken. When there is a dynamic load at the top of the foundation pit, there should be at least 1m wide berm between the top of the foundation pit and the dynamic load. If the engineering geology and hydrogeology are poor or the dynamic load is too large, the berm should be widened or reinforcement measures should be taken. When the pit wall can't guarantee the stable slope angle, the foundation pit wall should be supported and protected or other reinforcement measures should be taken.

6.3 Production of outdoor billboard steel structure members

6.3. 1 Setting out and marking of components, welding shrinkage and machining allowance shall be reserved according to process requirements. The allowable deviation between the size of the template and the distance between any two holes on the template and the center of the hole is 0.5 mm.

6.3.2 The relative torsion of the end face of the intersecting line at both ends of the steel tube member along the circumferential direction shall not be greater than 2.0 mm.

6.3.3 When cutting the cutting line and marking line of parts by hand, the allowable deviation shall not exceed 2.0 mm. ..

6.3.4 Before assembling parts, rust, burrs and oil stains within the range of 30 mm∽50 mm should be removed from the connection surface and both sides of the weld.

6.3.5 After the structure is made, it shall conform to the requirements of the construction drawing and the provisions of this standard.

Acceptance of finished products. The allowable deviation of component shape and geometric size should match.

The following provisions.

A) The deviation of component length should not exceed 2mm.

B) the overall curvature of the component shall not be greater than L/ 1000 and shall not be greater than 3 mm; The local curvature should not be greater than L/750 and not greater than 2mm.

C) The in-plane deviation of the gusset plate on the member shall not be greater than1.5mm; ; The out-of-plane deviation of the joint plate should not be greater than1.0mm; ; The deviation of bolt holes on the connecting plate should not be greater than1.0mm; ; The distance deviation between the bolt hole on the connecting plate and the reference line is 65438 0.5mm.

6.3.6 The steel structure of steel billboards must be treated with anti-corrosion.

6.3.7 The derusting quality of steel structures is divided into three levels, and shall comply with the provisions in Table 1.

Table 1 Derusting Quality Grade Table

Quality standard of graded derusting method

1 Exposed metal color on the surface of steel ore or quartz sand derusting steel.

Metal color is exposed on the steel surface by sandblasting, shot blasting and acid cleaning.

3 general tools to remove (steel shovel, steel brush) residual on the surface of steel a small amount of rolled skin.

Note: 1 grade and grade 2 are used for ex-factory inspection, and grade 3 is used for rust removal during touch-up.

6.3.8 When paint is used for anticorrosion of steel members, it should have two bottom surfaces and three side surfaces, and primer and topcoat should be used together.

6.4 Installation of outdoor billboard structure

6.4. 1 Before transportation and hoisting, the technical scheme shall be formulated, and the component hoisting method and safety measures shall be specified.

6.4.2 Before installation, check the positioning axis, foundation axis, position and elevation of embedded parts. The strength of foundation concrete meets the design requirements, the backfill and compaction around the foundation are completed, and the foundation axis marks and elevation foundation points are accurate and complete.

6.4.3 The allowable deviation of foundation and ground anchor shall comply with the provisions in Table 2.

Table 2 Allowable deviation of foundation and ground anchor

Description of allowable deviation of the project

1 bearing surface (concrete pier) elevation 2.0mm.

Levelness11000

2 bearing surface (flange end face) elevation 65438 0.5 mm.

Levelness 1/500, and not more than 3 mm

3. The torsional deviation of ground anchor position is 65438 0.00 mm.

4. The diagonal deviation of the ground anchor flange is ≤L/ 1 500, and "/10 mm L—-diagonal distance"

5. The deviation between adjacent column feet of ground anchor is ≤b/ 1 500, and "/10 mm b—-column foot spacing"

6. The length of the ground anchor flange is 10 mm.

7 thread length of ground anchor lw10mm lw-design thread length

6.4.4 The loading, unloading, transportation and stacking of steel structure members of billboards shall not be damaged, and the deformation of the members shall be prevented during the movement.

6.4.5 When the components must be drilled at the construction site, gas cutting reaming should not be adopted during installation.

6.4.6 Before the installation of steel structure advertising frame, the quality of steel members should be checked. When the deformation and defects of steel members exceed the allowable deviation, they should be treated.

6.4.7 When installing wall billboards and roof billboards, reliable protection measures must be taken, and the building structure, waterproof layer and its external decoration shall not be damaged.

6.4.8 In order to ensure the safety of construction personnel, the installers of billboards on the roof and walls of high-rise buildings must take corresponding safety protection measures when working at high altitude, and construction is not allowed when the wind is above level 6.

6.4.9 For nodes connected by flanges, the joint rate of flange contact surface shall be not less than 70%, and it shall be checked with a 0.3 mm feeler gauge, and the insertion depth shall be.

The sum of the areas should not be greater than 30% of the total area, and the maximum gap at the edge should not be greater than1.0mm.

6.4. The weld quality of10 installation shall meet the design requirements. All welds on site shall be inspected as Grade III welds, and rust prevention treatment can be carried out only after passing the inspection.

6.4. 1 1 The quality of mounting bolts shall meet the design requirements. After the tension bolt is tightened (it must be locked with double nuts or spring washers), the exposed length of the screw can be (2∽3) threads.

6.4. 12 After the whole structure is corrected, the tightness of all bolts shall be checked with a torque wrench.

6.4. 13 After the main components of the steel structure advertising frame are installed in place, they should be corrected and fixed immediately, and the steel components installed on that day should form a stable spatial system.

6.4. After the installation of14 structure, the installation quality should be checked. The allowable deviation of installation shall comply with the provisions in Table 3.

Table 3 Allowable deviation of beam-column installation of billboard structure

Description of allowable deviation of the project

1 column verticality deviation ≤ h/1000h-column height.

2 horizontal deviation of beam ≤ l/1000 l-beam span

7 outdoor billboard project acceptance

7. 1 Intermediate acceptance

7. 1. 1 The following items must undergo intermediate acceptance:

A) After billboard foundation excavation, but before concrete pouring;

B) The foundation and connection parts have been completed;

C) Before the billboard steel structure members leave the factory;

D) After assembly at the installation site, but before overall hoisting.

7. 1.2 The intermediate acceptance shall be attended by the supervision unit and the construction unit to jointly check and accept and issue a written explanation.

7. 1.3 During the acceptance, the inspected items shall be comprehensively inspected and carried out in accordance with the construction drawing and this standard.

7.2 Completion acceptance

7.2. 1 The project completion acceptance shall be presided over by the construction unit, with the participation of the construction unit, supervision unit and design unit. The completion acceptance report shall be signed by all parties concerned and filed as required.

7.2.2 The engineering quality of outdoor billboard structure must meet the requirements of this standard and related technical specifications.

7.2.3 The following documents shall be submitted for the completion acceptance:

A) Design drawings and design change documents of billboard structure;

B) Negotiation documents reached during installation;

C) intermediate acceptance data

7.2.4 After the project is completed, the construction unit shall submit the project completion documents to the construction unit within two months.

7.2.5 The content and number of copies of completion documents shall comply with the provisions of GB/T50328.

8 Maintenance and verification of outdoor billboard structure

8. 1 maintenance