The 1m3 sewage cleaning tank of South Sewage Treatment Station is a supporting facility project of xx District of xxxxxxx Company, and we contract the civil works of the cleaning tank.
the sewage tank is 21.7m long and 14.3m wide, and the foundation is raft foundation. The absolute elevation of 24.8m is taken as the design relative elevation of . in this project, and the relative elevation of foundation bottom elevation is-－3.65m. The seismic fortification intensity of this project is 6 degrees, the concrete strength grade of foundation cushion is C1, the thickness is 1mm, and the width of each side is 1. The concrete strength grade of the pool body is C25.S6.
II. Reinforcement project
1. Construction deployment
1) Construction sequence
Cutting materials according to drawings-binding foundation and column reinforcement-binding wall reinforcement-binding roof reinforcement
2) Labor arrangement
According to the characteristics of this project, 1 people will be arranged for reinforcement processing and 4 people will be transported. 15 people are required to install steel bars
2. Construction preparation
1) Technical preparation
1.1 The technology and construction personnel related to the project are fully equipped
1.2 Be familiar with the drawings, check whether the drawings and descriptions conform to each other, whether there are contradictions and errors in each component, and whether the dimensions and elevations of the architectural drawings are consistent with the structural drawings
1.3 Master the construction methods and technical requirements of the project <
2.2 Some machines and equipment for steel bar processing will enter the site in advance according to the construction plan and relevant regulations.
2.3 Various types of steel bars will enter the site in advance according to the requirements of drawings, and sampling inspection will be made according to the regulations.
2.4 Various measures for rainy season construction will be taken.
3. Construction methods
1. Steel bar processing
1.1. The shape and size of steel bar processing must meet the design and specification requirements.
1.2, steel bar derusting adopts steel bar straightening machine to remove rust in the process of steel bar straightening.
1.3, steel bar must be straight, no local twists and turns, must be straightened before use and processing.
1.4. Hooking or bending of steel bars shall meet the following requirements:
1) The ends of Grade I steel bars shall be hooked at 18 degrees, and the arc bending radius shall not be less than 2.5 times the diameter of steel bars, and the length of straight parts shall not be less than 3 times the diameter of steel bars.
2) When the ends of Grade II steel bars are hooked at 9 degrees or 135 degrees, the bending radius d of Grade II steel bars shall not be less than 4 times the diameter of steel bars, and the length of straight parts shall be determined according to the requirements of design (3-11 Atlas).
3) The bending radius d at the bend of the middle part of the bent steel bar shall not be less than 5 times the diameter of the steel bar.
4) Make a 135-degree hook at the end of the stirrup. The bending diameter of the hook is greater than the diameter of the stressed steel bar and not less than 2.5 times the diameter of the stirrup. The straight length of the hook should not be less than 1d of the stirrup diameter.
5) When cutting materials mechanically, cut materials strictly according to the length of ingredient list, ensure correct cutting, make the steel bar perpendicular to the cutting edge of the cutting machine, and strictly implement the operation procedures to ensure safety. In the process of cutting and cutting, if the steel bar is found to have split, shrinking or serious elbow, it must be removed.
6) In order to ensure the processing quality when the steel bars in this project are bent, it is required to nail nails on the workbench as a sign of the size (bending point) according to the size of the ingredient list when processing below φ1.
7) When bending thick steel bars and steel bars with complicated shapes, the bending point position must be drawn with chalk according to the size indicated on the ingredient list before bending the steel bars, and the actual sample should be drawn on the workbench if necessary, and the bending point of the steel bars should be controlled with nails on the workbench. When marking nail points, the bending adjustment value shall be deducted according to different bending angles (see Appendix 1)
List of steel bar bending adjustment values
Angle of steel bar bending
3 45 6 9 135
Adjustment value of steel bar bending
.35d.85d2.5d
8). Molded steel bars shall be of correct shape, free from concave bending on the plane and free from cracks at bending points.
9) After the round steel is straightened by straightening machine, the bar with local bending can be straightened by spanner.
1) Allowable deviation of steel bar processing:
List of allowable deviation of steel bar processing
Allowable deviation of items
The net size of the stressed steel bar along the length direction is 1
The bending position of the bent steel bar is 2
The net size of stirrups is 5
2. Installation of steel bars
1. Installation of column reinforcement
1.1 Tie column steel dowel according to the given position line of column (scaffolding shall be set up before entering high altitude) and control its spacing
1.2 Put on column stirrups, and calculate the required number of stirrups according to the spacing given in the drawing. The joints of stirrups should be staggered on the longitudinal reinforcement at the four corners, and the column angle reinforcement and stirrups should be staggered with double buckles, and the tie buckles are in a figure of eight. Stirrups should be perpendicular to the main reinforcement
1.3 The protective layer thickness of column reinforcement should meet the design and specification requirements
2. Installation of plate reinforcement
1) Technological process: cleaning the template → drawing lines on the template → binding the plate stressed reinforcement → binding the negative bending distance reinforcement and corner reinforcement
2) Cleaning the sundries on the template, drawing the spacing of main reinforcement distribution reinforcement on the template with chalk, and putting them first according to the drawn spacing.
3) Tie the buckle into a figure of eight. When binding, the first steel bar is 5mm away from the beam edge, and when the last steel bar is more than 5mm away from the beam edge, one more steel bar can be bound;
4) Tie a double-layer steel bar net with negative reinforcement and add a Ф8 spacing of 1/㎡ steel bar stool to ensure the position of the upper steel bar.
5) When placing, the short-span main reinforcement shall be placed under the long-span main reinforcement, and the anchorage length of the reinforcement in the beam shall not be less than 1d；;
4. Quality standard
1. Master control project
1.1 When installing steel bars, the varieties, grades, quantities and specifications of steel bars must meet the design requirements and the current national building materials standards;
1.2 the type and quality of welded joints of steel bars meet the requirements of the current Code for Welding and Acceptance of Steel Bars (JGJ18-96);
1.3 the connection mode of longitudinal reinforced bars meets the design requirements;
1.4 when it is found that the steel bars are brittle, the welding performance is poor or the mechanical properties are obviously abnormal, the chemical composition inspection or other special inspection shall be carried out for this batch of steel bars.
2. General project
2.1 Steel bars shall be straight and undamaged, and there shall be no cracks, oil stains, granular or flaky old rust on the surface.
2.2 the joints of steel bars should be set at places with less stress. It is not advisable to set two or more joints for the same longitudinal reinforced bar. The distance from the end of the joint to the starting point of steel bar bending is not less than 1 times the diameter of steel bar.
2.3 The number of missing buttons and loose mouth shall not exceed 1% of the number of buttons, and shall not be centralized;
2.4 steel binding is accurate and in place, and binding joints should meet the requirements of current specifications.
See the following table for the allowable deviation of steel bar installation:
Inspection method for allowable deviation of items mm
Measurement inspection for length and width of binding steel bar mesh 1 feet
Measurement inspection for mesh size 2 feet, and the third gear is the largest value
Measurement inspection for length and width of binding steel bar skeleton 1 feet
, 5 feet high
reinforced bar spacing 1 feet
row spacing 5 feet
protective layer thickness foundation 1 feet
column and beam 5 feet
plate and wall 3 feet
binding stirrups, Check the transverse rebar spacing by 2 feet, and take the third gear as the maximum value
Check the starting point of rebar bending by 2 feet
Check the center line of embedded parts by 5 feet
Check the horizontal elevation difference by +3 and feet
5. Civilized construction and environmental protection measures
1. Quality assurance measures
1.1 should be constructed in strict accordance with relevant national codes, regulations and design requirements. Implement comprehensive quality management, who is responsible for the construction, strictly control the construction process, and clarify the division of responsibilities.
1.2 implement a three-level quality management system to ensure that the construction time is under control.
1.3 timely, accurately and in detail, make original records of various constructions, so as to find problems in time and adjust the construction scheme at any time.
1.4 the construction personnel shall control the whole construction process in strict accordance with the ISO-92 standard and the standards stipulated in the company's quality control procedure documents, and the construction personnel shall operate in strict accordance with the requirements of the construction plan and work instructions.
2. Technical measures for safe construction
2.1 The project manager of this project will take overall leadership responsibility for the safety of the whole project, and technicians, functional departments and production workers at all levels will take corresponding responsibilities for safety work within their respective responsibilities.
2.2 strengthen the safety construction education for construction personnel and conduct regular safety inspections.
2.3 when entering the construction site, you must wear a safety helmet and receive admission education.
2.4 in the construction, each professional type of work must hold relevant certificates, and strictly implement safety operation procedures.
2.5 the project management personnel should educate all the construction personnel on the legal system of obeying the rules and discipline, and do a good job in safety disclosure before construction. No one is allowed to command or operate illegally, and obey the management of the security department personnel.
2.6 during the construction period, the safety officer will be fully responsible for the safety supervision. If unsafe factors are found, they will be eliminated at any time and effective preventive measures will be taken.
2.7 all matters not covered shall be implemented in accordance with relevant operating procedures.
3. Protection measures for civilization and finished products
3.1 Workers' operating places and surroundings must be clean and tidy, so that their feet are clear after work.
3.2 Strengthen the maintenance and repair of mechanical equipment, observe the mechanical safety operation procedures, and take safety protection measures to ensure the normal operation of machinery; Always keep the fuselage and surrounding environment clean.
3.3 all kinds of materials and tools used in the construction should be arranged in a planned way according to the construction progress and site conditions.
3.4 steel binding is finished, and you are not allowed to walk on the floor at will;
3.5 The processed shaped steel bars shall be neatly stacked according to the model and specifications on site to prevent bending deformation; Drainage ditches shall be prepared around to avoid steel bars falling into the soil; After the bottom plate reinforcement is bound, the support and horse stool should be firmly bound to avoid trampling deformation during other types of work;
3.6 temporary scaffolding should be set up when binding the wall reinforcement, and it is not allowed to step on the reinforcement;
3.7 when transporting and installing steel bars, they should be unloaded lightly and not thrown and collided at will;
3.8 After the plate reinforcement is bound, an overhead plank is erected on the plate as a temporary passage to prevent people from stepping on the reinforcement up and down;
3.9 during concrete pouring, pedestrians and working passages are erected, and concrete construction on steel bars is not allowed.
3.1 after the steel bar is bound, the site shall be cleared after the work, and the remaining iron wires and steel bars shall be gathered in piles in time.
II. Formwork project
1. Compilation basis
1. Construction drawing of clear water pool
2. Code for quality acceptance of concrete structure engineering (GB524-22
3. Technical Code for Safety of Fastening Steel Pipe Scaffolding in Building Construction (JGJ13-21).
2. Labor deployment
Template installation requires 2 labor forces every day.
3. Template production:
The models are uniformly processed or prepared in the processing site according to the drawings, and the template position, model size and quantity are marked after production.
1. formwork installation
construction sequence:
setting out → supporting raft foundation and independent column foundation formwork and wall hanging formwork → installing column formwork → installing wall formwork without formwork → installing plate bottom formwork
(1) setting out:
Before formwork installation, control the inner sideline according to the elevation, center line and formwork installation popped up on the cushion, foundation and board surface by measuring marks.
(2) Erection of formwork support:
The erection spacing of full-house scaffolding is @8×8, which cannot be greater than 1 mm.. The first horizontal bar is set 3㎜ high from the ground, and the second and third horizontal bars are set with a spacing of 15 mm. The vertical and horizontal bars and bracing must be tightened with fasteners.
(3) Installation of wall formwork
The main formwork is made of wood formwork, reinforced with 5×1 wood squares, steel pipes and 1㎜ diameter tie bolts. Wood square stands with its back to the surface of the formwork, with a spacing of 2㎜, and the horizontal and vertical spacing of the pull bolts are 5㎜. The sealing ring and steel jacking are welded in the middle of the bolts to prevent water leakage and the cross section becomes smaller when concrete is poured. The steel pipe horizontally backs on the wood square, and the spacing is the same as that of the bolts. Re-use steel pipes to brace the soil wall up and down, and the left and right spacing is 15㎜.
(3) Install the bottom die:
The bracket must be stable and not sink. According to the design requirements, set up full-house scaffolding poles at intervals. When the formwork is erected, the height and verticality should be controlled by pulling wires, and the leveling should be checked.
the formwork should be laid from all sides to the middle, and the formwork should be connected with the supporting steel pipe keel and wall internal formwork, and firmly connected with nails. The formwork covers the internal formwork of the wall, and the seams of the formwork are pasted with adhesive tape, and then the release agent is painted after passing the inspection.
the embedded parts and reserved holes on the board shall be embedded after the position line is popped up on the template to ensure the accurate position, and fixed with steel pipes or other methods.
after the bottom die is installed, the template surface elevation and the flatness of the board surface, the accuracy of flat-fell seam, embedded parts and reserved holes should be checked, and the position of the core column should be further determined.
(4) Installation of column joint formwork:
Gaps at the joints of plate formwork, column formwork and plate formwork are tightly patched with wood veneer and adhesive tape to prevent slurry leakage, and reinforced firmly; Check whether the flatness is the same as and vertical to the bedding face.
4. Installation of mould
(1). Assemble the mould in strict accordance with the mould drawing.
(2). Release the column edge and 5 attached lines, correct the binding column rebar and install the cushion block, and make ridges along the periphery of the column with high-grade mortar to ensure the founder of the mould.
(3). Installation, correction and reinforcement of formwork. When installing the mould, the model shall be installed in place at one time.
(4). The reinforcement system of formwork adopts steel pipes with a horizontal spacing of 5, which are reinforced on all sides, and the roots are properly densified to prevent formwork expansion.
(5). The internal mould must be cleaned before dusting.
5. Self-inspection of formwork installation
After the formwork is supported, self-inspection shall be conducted first, and the self-inspection and self-evaluation form shall be filled in, and then reported to the project department and Party A's company for acceptance. After the acceptance, the handover procedures shall be completed, and then the next working procedure shall be constructed. That's almost it! Thank you, please give points!