What will go wrong with the concrete running form

Answer: Concrete running formwork, concrete leakage, or concrete loosening to form honeycomb, exposed stones, etc.; In the worst case, it will affect the formwork support system, resulting in a large-scale collapse of the formwork and causing a major safety accident.

Supplement: The parts where foundation leakage is prone to occur generally include concrete foundation, such as concrete is not compact, construction joints and deformation joints, cracks, embedded parts and pipes.

Road through the wall, cement mortar and membrane waterproof layer.

When the new formwork supports system plate bottom formwork, formwork span, concrete strength reaches 50% of design strength before dismantling; When the span m-m, the concrete strength reaches 75% of the design strength before the mold can be removed; For beams, the concrete strength reaches 75% of the design strength when the span m of the arch shell is m, and when the span is greater than m, the concrete strength reaches 100% of the design strength before the formwork can be removed. For this reason, if the span of the beam, plate and arch is reduced, the internal stress of the structure is also reduced accordingly, and the concrete strength can be reduced when the formwork is removed, and then according to the law of rapid growth of the early strength of the concrete, the formwork removal time can be advanced. The basic principle of formwork early demolition construction technology is to artificially reduce the structural span in the construction stage, reduce its internal force, so that the formwork can be dismantled early, and the safety of the structure is not affected, so as to achieve the economic and social benefits due to the early demolition of the formwork.

At worst, the concrete leaks, or the concrete loosens to form honeycombs, exposed stones, etc., and the heavy ones affect the formwork support system, resulting in a large-scale collapse of the formwork and causing major safety accidents.

Running formwork: refers to the situation that there is a loose seal around the envy of the formwork when the concrete is poured, or a small area of concrete.

Soil leakage - slurry leakage.

Expansion form: During pouring, the concrete foaming agent and pouring height may be too high due to formwork support and steel bar binding.

It leads to the pouring pressure and other reasons, resulting in the deformation of the entire formwork, the opening (swelling) of the limbs of the stool, and the flow of concrete.

Large amounts. Treatment: 1Chisel out unqualified concrete, and manually fill it with concrete or mortar of a higher grade to meet the strength and quality standards, and maintain a moist curing state.

Generally, when pouring concrete, the pressure on the side formwork is very large, and attention should be paid to controlling the pouring height before the initial setting is not too large, and the deformation of the formwork and support should be observed and checked at any time.

2.Due to the installation of the formwork is not firm, the formwork is deformed under the side pressure of concrete pouring, or it may be due to overvibration, which causes the formwork to loosen, or the wire that fixes the formwork is loose, and this situation should be avoided as much as possible when the formwork is erected.

The specific area of the jujube world: concrete running mold and expansion mold are completely two things. Running formwork refers to the insufficient support point of the concrete formwork in the system.

Running formwork: refers to the situation that there is a loose seal around the formwork when the concrete is poured, or a small area of concrete leakage - slurry leakage.

Expansion formwork: During pouring, the whole formwork may be deformed, stretched (expanded), and the flow of concrete running is large due to formwork support, steel bar binding, concrete foaming agent, and high pouring height.

Differences: 1. The reasons are different.

The running film is because there is a loose seal around the formwork when the concrete is poured, and the expansion film is due to the formwork support, steel bar binding, concrete foaming agent, and the pouring height is too high to cause the pouring pressure to be high.

2. The resulting results are different.

Running film will lead to concrete leakage, or concrete loosening to form honeycomb, exposed stones, etc.; In the worst case, it will affect the formwork support system, resulting in a large-scale collapse of the formwork and causing a major safety accident. The swelling film will cause the entire template to deform and open (swell).

Concrete running formwork is the process of pouring and pounding concrete components, and the formwork around the component (because the fasteners are loose or not enough when supporting the formwork, can not withstand the pressure of pouring and smashing) "ran away". The consequences are the deformation of concrete components, and the scrapping of components.

1. Cause analysis:

1) The management of the construction team is not in place, the technical disclosure is not detailed, and the formwork is not sub-projected.

Carry out. Trace inspection and acceptance, the quality awareness of the operators is weak, and the "three inspection system" has not been implemented.

Exemplary guidance system".

2) The formwork used in construction is old and cannot be repaired in time. The thickness of the formwork can not meet the construction requirements, the quality is poor, and the reinforcement measures are not in place. There are many times of repeated use, and the eliminated ones have not been eliminated in time.

3) Construction plan.

The operability is not strong, and the mechanical calculation of the support and reinforcement system of the formwork is not comprehensive.

The technical guarantee measures are insufficient, and the workers reduce the construction process in the actual operation process, which is not strict.

The lattice is supported according to the construction plan, and the support and formwork reinforcement are not in place.

2. Precautionary measures:

1) Strengthen construction management, and select qualified construction teams with high skill level and formal team management.

Strengthen the quality management of the construction team.

Technology management. The foreman should determine the assembly of the formwork in advance.

plan and make technical, quality and safety disclosure to the construction team.

2) Select qualified formwork, and choose strong stiffness and good flatness as columns, beams, and plate formwork.

Board. The surface of the template should be coated with a release agent before each use to allow it to be released. The stacking area of bamboo plywood and wood should be covered with a tarpaulin to prevent the material from being deformed due to rain and sun.

3. Construction precautions:

1) During construction, work in strict accordance with the requirements of the formwork design, and use cross-through bolts and vertical bolts for large columns and walls.

to the steel flute to ensure that the strength and rigidity of the formwork are enough to resist the lateral pressure of the concrete.

2) The pay-off should be done before the formwork is installed.

Positioning work, formwork pay-off according to the construction drawing.

Bounce with ink line. Out of the centerline and edge, the edge line and the outer control line of the wall formwork to facilitate the installation and correction of the formwork. The bottom of the mat at the bottom of the template should be leveled in advance, and the debris should be cleaned up to ensure the correct position of the template and prevent the bottom of the template from leaking or rotting roots after concrete forming.

3) The formwork installation should be tight, smooth, no slurry leakage, good table, no mold expansion, no mold running

No deformation. The tape used for joint plugging must not protrude from the surface of the formwork.

4) After the formwork is calibrated, check whether the bolts are loose, and the spacing of the bolts should not be appropriate.

It is too large to prevent the cross-section template from being stressed unevenly.

If it is at the beginning of pouring on the running form, to immediately repair the correcting template after pouring concrete, if the pouring of concrete time is too long or the difficulty of repairing and correcting the template is comparative, you can only wait for the concrete of the running mold part after the demoulding is chiseled, if the deformation of the component is particularly serious after forming, affect the design and use of safety or function, it can only be dismantled and restarted.

Stop pouring or it will all collapse.

Concrete running mold and expansion mold are completely two things. Running formwork refers to the concrete formwork in the system in the support point is not enough, in the actual pouring of the formwork can not bear the weight of the concrete, and the formwork cracking, resulting in a large amount of concrete soil leakage. The expansion mold is also the key spring spike, because the concrete formwork is not enough in the system, the support point is not enough, in the actual pouring, the formwork can not bear the weight of the concrete, and the formwork is deformed, and there is no concrete leakage.

As we all know, most of the previous construction sites used traditional wooden round pipes for formwork reinforcement, and every time the construction site is completed, a large pile of wood can only be used as firewood, which is so expensive when you buy it, but it is not worth a penny when you sell it, and the damage to the forest is also obvious. The traditional wood square pipe reinforcement construction is very easy to run the mold, expand the mold, leakage slurry, etc., once it appears, rework and rebuild is inevitable, the construction period is delayed, the workload of workers increases, and the labor cost increases, which is also worth the loss.

The new formwork reinforcement system of Yidezhu eliminates the reinforcement of wood.

Beijing EDJ Technology has developed a new formwork reinforcement system with steel instead of wood for many years, which is energy-saving, consumption-saving, green and environmentally friendly, and 100% recyclable.

EDC new formwork reinforcement system model room.

All-steel structure: The materials used are high-performance Q235 carbon steel, ingenious design, integrated structure is tight, safe and reliable. Easy to operate, fast construction speed, excellent structural quality, its biggest advantage is high turnover rate, corrosion resistance, elasticity, strong and not easy to deform.

Product Specification Standard - All Steel Structure.

Production specifications: EDZ's new formwork reinforcement system can be customized and standardized according to the engineering structure to achieve arbitrary specifications. However, traditional timber reinforcement can only be used to meet the construction needs through interception.

Value comparison: The innovative structure and material application make the turnover times of the new formwork reinforcement system nearly 10 times higher than that of the traditional timber reinforcement, and on the basis of reducing the cost of a single building by more than 30%, it can be reused hundreds of times, and the residual value rate can reach about 50%.

EDEC can achieve the effect of clear water wall.

Removal effect: the surface of the concrete structure is smooth and shiny, the corners of the wall are vertically flat, and the three lines of the joint of the wall roof are flat. The actual measurement standard of cast-in-place concrete structure can reach more than 95 points.

The new formwork reinforcement system is the terminator of the traditional timber, which can truly achieve wood-free construction, circular turnover, and reuse, and can complete one-time pouring construction, save materials and costs for construction enterprises, improve project quality and construction efficiency, save energy and reduce consumption, save massive wood for the country, and completely solve many problems that have plagued China's construction industry for many years in the timber reinforcement system.