Refinement Management Of Concrete Pouring

Concrete engineering is one of the main construction tasks in engineering construction, and the molding quality largely determines the final appearance of building products. The construction cost of concrete engineering accounts for about 20%-30% of the total project cost, which is the focus of the cost management of the construction unit. Concrete construction management is one of the main ways to improve project quality and reduce construction cost.

Concrete pouring is one of the main construction tasks in construction projects, which usually includes foundation concrete pouring, structural concrete pouring, and secondary structure and sporadic component concrete pouring. Concrete pouring construction generally includes the main contents of concrete mixing and transportation, concrete pouring, vibrating, curing and quality defect repair.

Due to the limitation of construction technology, concrete construction usually has to be poured continuously, so nighttime construction is often necessary to ensure the continuity of concrete construction. Factors such as large workload, short construction time, and complex construction environment often cause many quality defects in the molding quality of concrete.

Concrete pouring construction is one of the most comprehensive construction management tasks, involving a series of site management and technical management related work such as material supply, site management, personnel organization, and technical index control. Problems in a certain link will increase the construction cost. Cost waste mainly comes from excessive concrete loss, and on the other hand, quality defects lead to a lot of repair labor costs.

Improvement Measures

1. Make Concrete Pouring Plans

Determine the pouring plan at least 1 day in advance, implement the responsible person for the relevant work, and make a disclosure to all participants. The pouring plan is the guidance document and operation rules for concrete pouring construction, which is targeted and operable. At least the following points should be specified:

A.The pouring position and the demand for concrete. and the concrete mix ratio and the corresponding engineering volume should also be specified.

B.The start and the end time of the pouring plan, the pouring efficiency per unit time, and the completion time of the node work.

C.The pouring process. Including the pouring sequence and distribution method, vibrating equipment and vibrating method, the retention of construction joints, the isolation measures between different grades of concrete, the elevation control method during the pouring process, the leveling and closing method, the covering and maintenance methods, etc.

D.Tasks and division of labor.

2. Preparation For Concrete Pouring

One day before pouring, the material manager and the supplier will determine the delivery situation and prepare the materials. The general person in charge arranges to implement whether the site preparation work has been completed:

Reinforcement rectification: Reinstate the reinforcement bars that exceed the elevation of the beam-column joints and where the reinforcement bars are too dense; rectify the bottom reinforcement blocks of the beams and slabs, and the spacing should not be greater than 1m*1m; rectify the horse benches with negative reinforcement, and reset the collapsed reinforcement bars, etc.

Formwork rectification: clean and moisten the surface of the formwork; all the joints of the formwork are pasted with adhesive tape; measures for preventing leakage of slurry at the column feet; measures for isolation of different labels;

Workers and equipment operators are in place, the site and traffic are smooth, and water and electricity lines and lighting fixtures are ready.

3.Notification Of Delivery

Before pouring, the material manager shall verify the pouring label and engineering quantity again, and notify the batching station to issue materials. Specify the time of arrival of materials and make preparations for construction on site.

4. On-site Acceptance

After the concrete arrives at the site, each vehicle must be checked and weighed. Concrete can only be used after the material manager, supplier and quality inspector have signed the acceptance opinions. Acceptance contents include: mix ratio (delivery note), slump (on-site measurement), workability (visual inspection), and weight (over-pounding). The bulk density of concrete should be clarified in the supply and sales contract to facilitate the conversion of volume, usually 2.3-2.5t/m3.

5. Unloading

A special person will discharge the material at the pump truck, and after the pouring of each truck is completed, the floor ash should be cleaned up, and there should be no leftovers. After the concrete pouring is completed, the pump pipe shall be cleaned, and no residue shall be left.

6. Tanker Appearance

Each car must be weighed and signed by both parties. The inbound and outbound weight can be used as the basis for the settlement of the delivery volume, which must be clarified in the supply and sales contract.

7. Pouring And Vibrating

Concrete pouring and vibrating are carried out according to the order and method in the pouring plan; construction joints and post-pouring belts are left in accordance with regulations; the use range of concrete of different grades is strictly controlled.

8. Process Inspection

During the pouring process of vertical members, the pouring range of beam-column joints shall be strictly controlled, and the material consumption shall be checked after the vertical members are poured. The mold guard and reinforcement personnel stand by the whole process, the formwork is deformed and the mold burst is rectified immediately, and the falling ash is cleaned and used in time. Control the thickness of the plate strictly. During the process of instrument measurement, there shall be no less than 1 measurement point per 60m2.

9. Supplement

Both vertical members and horizontal members need to be replenished. Before the last car material of the same label is sent, determine the amount of material to be replenished and notify the supplier in time. Every time the concrete is poured, a preparatory plan for the utilization of the remaining materials should be prepared, such as the pouring of prefabricated components.

10. Noodle Maintenance

After the pouring is completed, the surface is closed once to control the overall elevation and flatness. After the initial setting (generally about 3 hours after pouring), the secondary surface is collected to control the surface compactness and flatness. After the secondary surface is finished, the film is covered for curing, and the board surface and the side of the beam and column should be cured. The maintenance standard is: keep the concrete components evenly wet, sprinkle water on the board surface, and spray water from the beam and column sprayer.

11. Mold Removal And Quality Defect Rectification

Determine the demoulding time (side formwork) according to the actual situation of the project. Usually counted from the completion of pouring, it should not be earlier than 8 hours in summer and 10 hours in winter. Quality defects found after mold removal shall not be repaired without authorization, and quality defects must be rectified with the permission of the project technical director. For the concrete surface that needs to be chiseled, the chiseling time must be 24 hours longer than the pouring time.

12. Summary Report

After each pouring is completed, the difference between the delivery confirmation (inbound and outbound weighing conversion) and the planned material quantity is calculated, and the reasons for the difference are analyzed. When the floor is laid out, re-measure the slab elevation as one of the bases for re-checking the slab thickness.

Prepare a pouring report within 1 day after the pouring is completed, and make statistics on the construction costs such as material consumption, labor consumption, repair costs for quality defects, and other measures, and compare and analyze it with the winning bid list. Find out ways and methods to further improve construction quality and save construction costs.

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