Who has a safe construction scheme for full-house supports in bridge construction?

catalogue

The first chapter outline 1

Compilation basis and explanation of 1. 1: 1

1.2 project overview 1

Chapter II Layout of Supporting System 2

2. 1 Material Requirements 2

2.2 Selection of materials for supporting structure system 3

2.3 Supporting Structure Structure 3

Chapter III Structural Requirements of Supporting Structures 4

3. 1 Foundation Treatment and Requirements 4

3.2 structural requirements for upright posts 4

3.3 Construction Process Flow 4

The fourth chapter scaffold erection 5

4. 1 foundation treatment 5

4.2 Material Selection and Quality Requirements 5

4.3 bracket installation 5

4.4 Site Installation Requirements 6

Chapter V Project Management Organization and Labor Plan 7

5. 1 Organization and Management Network of Project Department Figure 7

5.2 Project Department Quality and Safety Production Leading Group 7

5.3 List of Organization Personnel of Project Department 7

5.4 Workforce Plan 8

Chapter VI Management Regulations and Guarantee Measures 8

6. 1 finished product protection measures 8

6.2 Seasonal construction measures 8

6.3 Monitoring measures 8

6.4 Safety and fire protection guarantee measures 9

6.5 Civilized construction, environmental protection and energy saving measures on the construction site 10

Chapter VII Checking Calculation of Supporting Stress 10

7. The longitudinal purlin under1bottom formwork is 10× 10cm, which is calculated as 10.

7.2 Checking calculation of 10× 10cm wooden fang on jacking overpass.

7.3 Checking calculation of stud strength 13

7.4 Checking calculation of allowable bearing capacity of foundation 14

Construction scheme of full-house support for capping beam

The first chapter is an overview.

Compilation basis and explanation of 1. 1:

1. 1. 1 construction drawing: * * * * * * * * * * main canal bridge project-construction drawing.

1. 1.2 Current main construction specifications

Code for Load of Building Structures (GB50009—200 1), China Building Industry Press;

Code for Design of Concrete Structures (GB500 10—2002) China Building Industry Press;

Handbook of Building Structure Calculation, Jiang, China Building Industry Press.

Building Construction Manual 4th Edition China Building Industry Press

Technical Code for Safety of Building Formwork (JJ162—2008)

Steel tube scaffold couplers (GB 1583 1—2006)

1.2 project overview

* * * * * * * * * Due to the large volume of concrete, the pier capping beam of the main canal bridge project is considered to be constructed by full-house support method. The capping beam is C30 reinforced concrete capping beam, and its length, width and height are about 21.8×1.4×1.25m. The pier capping beam is supported by ten piers, the diameter of which is 1. 1m, and the center spacing is 4.5m

Department position concrete strength grade beam formwork support height

(m) beam section size (m) beam calculation span (m)

Pier cap C303.8861.4×1.25 4.5

Cap quantity

Number of rebar, rebar diameter design, single length, design number, total length and total weight.

(mm) (cm) (m) (kg) (kg)

1 Φ25 2285 12 274.2 1055.67 4879.4

Φ25 2649 2 52.98 203.97

3 Φ25 2239 12 268.68 1034.42

4 Φ25 122 24 29.28 1 12.73

5 Φ25 137 24 32.88 126.59

6 Φ25 125 24 36.48 140.45

7 Φ25 167 24 40.08 154.3 1

8 Φ25 185 288 532.8 205 1.28

9 Φ 10 2 185 6 13 1. 1 80.89 1449.8

10 Φ 10 2093 4 83.72 5 1.66

1 1 Φ 10 36 1 326 1 176.86 726. 12

12 Φ 10 44 1 163 7 18.83 443.52

13 Φ 10 368 16 58.88 36.33

14 Φ 10 453 8 36.24 22.36

15 Φ 10 3 15 28 88.2 54.42

16 Φ 10 400 14 56 34.55

C30 concrete (m3 m3)37.4 1 6329.2

Chapter II Arrangement of Support System

2. 1 material requirements

2. 1. 1 bar material requirements: 1. Material requirements of steel bars: steel pipes shall conform to national standards BG/T 13293 or BG/T3092. The surface of steel pipe should be straight and smooth, and there should be no crack delamination and hard bending, and the deviation of oblique cutting at both ends.

2.2 Selection of supporting structure system materials

In this project, rigid formwork is used for the beam bottom and side formwork, the steel pipe of the frame body is φ48×3.5mm, 100× 100 wooden fang is used under the bottom formwork, and bamboo scaffolding is erected on the working platform.

2.3 Supporting structure

The horizontal spacing of the bracket is 0.5m, and the longitudinal spacing is 0.4m.. After reaching the pier position, properly adjust the position of the column to basically ensure that the cross bar can hoop the pier, and the range around the capping beam is the working platform1m. Height direction, bar spacing 120cm, so that all vertical rods are connected as a whole. In order to ensure the overall stability of the support, bracing is set in vertical and horizontal directions (the support can be arranged vertically and horizontally). After foundation treatment, pay-off is carried out according to the construction drawings, and supporting steel plates are laid along the longitudinal direction of the bridge, so that the support can be erected. After the scaffold is erected, use adjustable jacking to adjust the height of the scaffold or dismantle the formwork.

After the bracket is installed, horizontally lay 10× 10cm batten on the adjustable jacking, and then vertically lay 10× 10cm batten on it. Pay attention to the length of the purlin, and ensure that the overlapping place of two purlins will not affect the stress. After laying the bottom formwork of the support, measure the center and edge position of the bottom formwork of the capping beam.

Chapter III Structural Requirements of Supporting Structures

3. 1 Foundation treatment and requirements

For the undisturbed soil of the foundation pit at the pier, it is necessary to harden the scaffold base with 30cm thick C 15 concrete. Due to the tie beam between pier and pier in the middle of pier column, attention should be paid to the steel pipe connection at this tie beam when erecting steel pipe frame.

3.2 vertical pole structure requirements

3.2. 1 Vertical and horizontal sweeping poles must be set. The longitudinal sweeping rod should be fixed on the vertical rod with a right-angle fastener no more than 200mm away from the basal epithelium, and the transverse sweeping rod should also be fixed on the vertical rod near the bottom of the longitudinal sweeping rod. When the vertical pole foundation is not at the same height, it is necessary to extend the beam span higher than the vertical sweeping pole to the lower part and fix it with the vertical pole, and the height difference should not be greater than1m.

3.2.2 Poles should be connected with streets (overlapping is forbidden), and joint positions should not be set synchronously. The staggered distance between two joints separated by synchronous vertical poles should not be less than 500; The distance from the center of each node to the column node should not be greater than 1/3 step.

3.2.3 The lap length shall not be less than 1m, and the three rotating fasteners shall be fixed at equal distances. The distance from the edge of the end fastener cover plate to the overlapping end in the vertical and horizontal direction should not be less than 100.

3.3 Construction process flow

Site leveling → basement foundation treatment → bracket installation → formwork installation → steel bar installation → beam pouring → maintenance → formwork removal.

The fourth chapter scaffolding.

4. 1 foundation treatment

The pier is located at the bottom of the river pit and the foundation is on the undisturbed soil. Harden the foundation with 30cm-thick C 15 concrete, and then lay a thick square plate on the hardened site according to the position where the full-house support holds the steel pipe column.

4.2 Material Selection and Quality Requirements

The specification of steel pipe is φ48×3.5mm, and the product certificate is available. The end cut of steel pipe should be smooth, and it is forbidden to use steel pipes with obvious deformation, cracks and serious embroidery corrosion.

Fasteners shall be selected according to the current national standard Fasteners for Steel Pipe Supports (GB 1583 1), and malleable cast iron fasteners matching the diameter of steel pipes are strictly prohibited. New fasteners should have factory certificate, inspection report of legal inspection unit and product quality certificate. When the quality of fasteners is in doubt, sampling inspection shall be conducted according to the current national standard Fasteners for Steel Pipe Support (GB 1583 1). Old fasteners should be checked for quality before use. Cracks, deformation and corrosion are strictly prohibited. Bolts with smooth threads must be replaced.

4.3 bracket installation

The horizontal spacing of the bracket is 0.3m, and the longitudinal spacing is 0.4m.. After reaching the pier position, properly adjust the position of the column to basically ensure that the cross bar can hoop the pier, and the range around the capping beam is the working platform1m. Height direction, bar spacing 120cm, so that all vertical rods are connected as a whole. In order to ensure the overall stability of the support, bracing is set in vertical and horizontal directions (the support can be arranged vertically and horizontally). After foundation treatment, pay-off is carried out according to the construction drawings, and supporting steel plates are laid along the longitudinal direction of the bridge, so that the support can be erected. After the scaffold is erected, use adjustable jacking to adjust the height of the scaffold or dismantle the formwork.

4.4 Site Installation Requirements

4.4. 1 After the vertical pole is erected, the sweeping pole and the first step size pole shall be set in time, and the sweeping pole shall be 20cm away from the base surface. Before the completion of the support, the erection and setting of the support should be used for temporary fixation. The support between piers must be encrypted according to the design requirements to make the support as complete as possible.

4.4.2 After the frame and pier are firmly supported, bracing shall be set synchronously with the frame rising.

4.4.3 The safety net shall be set after the setting of bracing.

4.5 technical requirements

4.5. 1 Adjacent stud joints should be staggered at different intervals, and the distance from the adjacent ledger should not be greater than one third of the interval;

4.5.2 At the master node, the distance between the center points of right-angle fasteners and rotary fasteners used for fixing horizontal rods, vertical rods and bracing should not be greater than15 cm; ;

4.5.3 The opening of butt fastener should be upward or inward;

4.5.4 The length of the end of each bar protruding from the edge of the fastener should not be less than100 mm; ;

4.5.5 The vertical deviation of the vertical pole should not be greater than1/300 of the frame height;

4.5.6 The extension positions of the upper and lower crossbars should be staggered within the vertical distances of different uprights, and the distance from the connected uprights should not be greater than the vertical distance of 1/3;

4.5.7 The safety net should be hung at the bottom of the main rail inside the outer rail, and the mesh should be bound with wire.

4.5.8 Fastener installation shall meet the following requirements:

4.5.8. 1 Fastener specifications must be the same as the steel pipe diameter;

The tightening torque of 4.5.8.2 bolts should not be less than 50KN? m；

Chapter V Project Management Organization and Labor Plan

5. 1 Network Diagram of Organization and Management of Project Department

5.2 Project Department Quality and Safety Production Leading Group

Team leader:

Deputy team leader:

Members:

5.3 List of personnel organized by the Project Department

Teacher, surname, first name and post

Project Manager's Office Project Manager

instructor

Safety officer of quality and safety department

Data processing program

Technician of engineering department

Construction worker

Materials and equipment section

Material person

5.4 workforce planning

Ensure that there are not less than 60 carpenters, including 20 scaffolders, 30 carpenters and carpenters 10.

Chapter VI Management System and Safeguard Measures

6. 1 finished product protection measures

6. 1.65438+ Installed plane formwork shall not be used as temporary stacking and working platform to ensure the stability of support and prevent the deviation of elevation and leveling of plane formwork.

6. 1.2 The formwork shall be cleaned in time after being dismantled, and the fasteners, nuts and other related parts shall be cleaned and maintained in time.

6. 1.3 After the formwork support system is installed, it is forbidden to dismantle it at will.

6.2 seasonal construction measures

Before and after the gale, the safety inspection of the frame body should be carefully carried out to see if there are any potential safety hazards. In case of strong winds of magnitude 6 or above, outdoor high-altitude operations should be suspended, and the construction site should be cleaned after the rain before operations can be carried out.

6.3 Monitoring and control measures

6.3. 1 Before concrete pouring, the shuttering personnel in the site shall be cleaned up, and special personnel shall be arranged to prevent anyone from staying under the capping beam during concrete pouring.

6.3.2 When pouring concrete, special personnel must be arranged to observe the deformation of formwork and supporting system. If any abnormality is found, the construction shall be stopped immediately and the personnel shall be evacuated quickly. After the danger is eliminated, it can only be resumed after the project leader has checked and agreed. Observe once every 30 minutes during pouring and once a day after pouring until the formwork is removed.

6.4 Safety and fire protection guarantee measures

6.4. 1

Establish a complete safety assurance organization system, the project department will be implemented by the project manager, full-time on-site safety officer and technical director, improve the safety management system at all levels, do a good job in safety technical disclosure at all levels, and divide the responsibilities into people.

6.4.2

Establish and improve the safety responsibility system, adhere to the daily on-site inspection of safety supervisors, focus on the inspection of full-time security officers, and specify a strict reward and punishment system; After the installation of sectional or integral formwork is completed, the construction of next working procedure can only be carried out after the acceptance of relevant personnel. Before installation and dismantling, engineers and technicians should make safety technical disclosure of construction work to the operation team in written form, and the operation team should conduct self-inspection and mutual inspection after work according to the written disclosure.

6.4.3

Scaffolders and carpenters for formwork erection must hold relevant certificates and wear safety helmets, safety belts and non-slip shoes. Aerial work personnel must be equipped with work bags and put gadgets and spare parts in them to avoid falling from high altitude and injuring people.

6.4.4

Operators should not be crowded together, and everyone should have enough working faces. When many people operate at the same time, they should pay attention to cooperation and unify their signals and actions.

6.4.5

When shuttering, ripping and pouring concrete, irrelevant personnel are not allowed to enter below the capping beam, and the safety officer is responsible for the site.

6.4.6

Template support should be provided with ladders, and it is forbidden for operators to climb up and down.

6.4.7 Formwork shall be commanded by a special person, the work area shall be fenced, and there shall be no other types of work, and a special person shall be responsible for supervision. It is forbidden to throw the dismantled formwork and parts.

6.4.8

Before ripping, check whether the tools used are effective and reliable. Tools such as wrenches must be put into tool bags or hung on the body, and check the safety measures within the scope of ripping site.

6.5 Civilized construction, environmental protection and energy-saving measures on the construction site

6.5. 1

All templates, steel pipes and other materials should be piled up in a unified way. Without the consent of the builder, it is not allowed to saw off the wooden Fang, formwork and steel pipe.

6.5.2

Don't make holes in the template at will. After verification, it is necessary to obtain the consent of the competent foreman when opening a hole to minimize the damage to the template. When the steel bar is bound, the formwork shall not be moved at will.

6.5.3

Before template installation, the template should be prepared reasonably according to the drawing size, and the release agent should be painted. After the formwork is dismantled, it should be cleaned and repaired in time, neatly stacked and marked.

Chapter VII Checking Calculation of Supporting Force

7. 1 bottom formwork 10× 10cm longitudinal fang checking calculation.

Scaffolding uprights under the bottom formwork shall be arranged according to 40cm×30cm, and the top of tie beam between piers shall still be placed according to this distance. The longitudinal wooden purlins under the bottom formwork are arranged at the center spacing of 30cm. For the calculation of longitudinal wooden Fang, the calculation span is 0.4m, because the engineering quantity is calculated according to the stress of simply supported beam:

Concrete load of capping beam: p1=1.25m× 24kn/m3 = 30kn/m2.

Load of capping beam reinforcement:

P2 = (4879.4+1449.8) × 9.8×10-3/(21.8×1.4) = 2.03 kn/m2.

Equipment and labor load: P3 = (8× 60+2× 25+250 )× 9.8×10-3/(21.8×1.4) = 0.25kn/m2.

(Note 3: It is assumed that there are 8 workers at the time of pouring, 60Kg/ person; 2 vibrators, 25Kg/ set; Other equipment 250Kg)

Concrete pouring impact and vibrating load: (take 25% of concrete weight)

P4 = 0.25×30kN/m2 = 7.5 kN /m2

P = (p1+p2+P3+P4) = 39.78kn/m2.

If the safety factor is 0.2, there is p m =P× 1.2= 47.74 kN /m2.

Because the center distance of longitudinal wooden Fang under the bottom die is 0.3m and the span is 0.4m, therefore:

Q 1=P m× 0.30 = 47.74× 0.30 =14.32kn/m.

w = bh2/6 = 10× 102/6 = 166.667 cm3