➤ the preventive measures shall be carried out in strict accordance with the construction scheme, and the technical disclosure shall be strengthened
. 
Diagonal braces shall be installed on both sides of the column and wall
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When the beam height is 1 to 1.2 m, a back ridge is set
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A split bolt should be set at the joint of two sections of back ridge
.
Problem 5: too large spacing between pin pieces and loose joint ➤ typical example ➤ hidden danger affects the aluminum formwork
.
If the floor and beam bottom are supported by early dismantling independent steel support, the support spacing is less than 1.3mx1.3m
.
The transverse spacing of split bolts shall be ≤ 800 mm, and the starting spacing shall be from the starting edge of inner wall When the width of the wall is less than or equal to 400mm, a split bolt is set at the end, which is close to the wall panel under the beam
.
➤ preventive measures: 1
.
When installing the external wall formwork, the top K-plate shall not be removed as the upper root and limit, so as to prevent the formwork from running away, staggering and slurry leakage
.
However, due to the difference between the construction method of aluminum alloy formwork and traditional formwork, there are many process problems in the actual construction process
.
➤ corrective measures: if the back ridge and the space between split screws are too large, it is necessary to reinforce them in time
.
This paper is the Yajule project department from the engineering example of aluminum mold construction summed up 9 common problems, and gives the prevention measures, has guiding significance, you can refer to in the project! Attention should be paid to the prevention and treatment of 9 common problems in aluminum formwork construction problem 1: the spacing of vertical poles does not meet the requirements of the scheme ➤ typical examples ➤ hidden dangers affect the spacing of vertical poles, which does not meet the requirements
.
It is easy to cause the instability and deviation of the formwork during the later concrete structure pouring, resulting in poor sense of concrete forming quality and some safety hazards
.
If the quantity of diagonal bracing is insufficient, it should be added according to the requirements, and the diagonal bracing should be constructed in strict accordance with the deepening drawings
.
➤ preventive measures for aluminum formwork construction, a reasonable and feasible construction scheme shall be formulated, the construction shall be carried out in strict accordance with the scheme, the process acceptance shall be strengthened, and the structural drawings and reinforcement drawings shall be carefully reviewed
.
Too large spacing between pin pieces makes the formwork not fixed firmly and loose joint, which leads to concrete leakage and dislocation, and affects the appearance quality of concrete surface and subsequent process construction
.
Problem 8: the reinforcement is not in place, the screw and diagonal brace are loose, the pouring is extremely explosive, and the mold burst point ➤ typical examples ➤ hidden dangers affect the aluminum mold reinforcement is not in place, the screw is not fixed, and the diagonal brace is loose, which directly affects the stability and bearing capacity of the aluminum mold, leading to the instability and mold burst in the concrete pouring process, and affecting the surface appearance quality
.
Aluminum alloy formwork, with the advantages of light weight, easy disassembly, high rigidity, high precision, good stability, high bearing capacity, good concrete forming quality, many turnover times, safe and civilized construction, is more and more widely accepted and applied by construction enterprises
.
In the process of arranging the spacing of split bolts, attention shall be paid to avoid the position of main reinforcement from 200 mm to 300 mm, so as to prevent the main reinforcement from blocking the position of split bolts
.
➤ corrective measures: if the setting spacing of diagonal bracing is too large and the installation does not meet the requirements, diagonal bracing shall be supplemented
.
Problem 3: the setting of back ribs and screws does not meet the requirements of the scheme (the height of the first row of back ribs, the spacing between screws and other back ribs) ➤ typical example ➤ hidden danger affects the back ribs and screw setting
.
➤ corrective measures: the pin of corner plate hole must be fully punched, and the missing pin shall be repaired
.
➤ corrective measures: the area around the welding hole should be polished and cleaned
.
➤ preventive measures to strengthen the process disclosure and construction acceptance, construction in strict accordance with the requirements of the scheme, for the pole setting does not meet the requirements of timely rectification
.
The construction shall be carried out in strict accordance with the requirements of the scheme, and the process acceptance shall be strengthened
.
The distance between the bottom back ridge and the plate surface shall not be more than 300 mm, the distance between two back ridges shall not be more than 700 mm, and the wall column with a floor height of 2.8-3 meters shall be provided with no less than 4 back ridges for the inner wall column and no less than 5 back ridges for the outer wall column
.
The wall column side formwork shall be reinforced by back ridge and split screw
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The back ridge of beam side formwork shall be used as beam When the height is less than 1 m, there is no back ridge
.
When erecting the aluminum formwork of the wall column, the formwork position shall be selected according to the line and positioning reinforcement
.
The use of welding without hole opener will lead to uneven welding parts, and affect the pouring quality around the reserved concrete holes and subsequent process construction
.
➤ corrective measures: 1
.
Problem 7: the lower K-plate of the external wall is often staggered, the upper K-plate is not straightened, and the external wall is uneven after pouring ➤ typical examples ➤ hidden danger affects that the K-plate of the external wall is not straightened and is not effectively connected with the wall column formwork, which easily leads to the upper and lower staggered platform of the external wall after concrete pouring, and the external wall surface is uneven, which affects the subsequent construction process
.
When the expansion section of the outer wall is larger than 5mm, the K-plate shall be removed (the inner wall shall be installed first), and the explosive part shall be chiseled, and then the K-plate shall be installed again after the repair is qualified
.
Problem 2: the setting of diagonal braces does not meet the requirements of the scheme ➤ typical example ➤ hidden danger affects the setting of aluminum formwork diagonal braces, which directly affects the rigidity and stability of the formwork
.
The distance between the braces and the end of the wall shall not be greater than 750mm, the distance between the braces shall not be greater than 1600mm, no less than two diagonal braces shall be set for the wall with a width greater than 2m, no less than one diagonal brace shall be set for the wall with a width less than 1.2m and the short limb of The fixed embedded parts of diagonal bracing shall be reserved
.
➤ preventive measures for water and electricity installation of aluminum formwork, the embedded bottom line pipe through beam and embedded through wall casing shall be set out and positioned accurately first, and then the special hole opener shall be used for hole opening and then the pipe shall be fixed to avoid welding hole opening
.
Excessive spacing will significantly reduce the bearing capacity of the support system, affect the overall stability of the scaffold, and seriously may lead to collapse and bring huge losses to the project
.
➤ corrective measures according to the requirements of the program to set up additional rod support
.
Problem 4: the back ridge and screw are missing or used in the wrong position ➤ typical examples ➤ the hidden danger affects the back ridge and screw of aluminum formwork
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Before the construction of each layer, the fixed points of the lower diagonal bracing should be embedded, and the distance between the support and the end of the wall should not be more than 750mm, and the distance between the support and the end of the wall should not be more than 1600mm; 2
.
The falling plate shall be leveled with the pad plate before installing the wall column formwork
.
➤ corrective measures: the lower K-plate shall be firmly connected with the wall column formwork with pins, and the upper K-plate shall be straightened to avoid mortar leakage and staggered platform due to loose joint
.
2
.
➤ the preventive measures shall be carried out in strict accordance with the requirements of the scheme, the process inspection and acceptance shall be strengthened, and timely rectification shall be carried out if the requirements are not met
.
➤ corrective measures: split bolts must be added in the middle where the spacing of back ridge bolts is too large, and the back ridge with overlapping should be replaced and then reinforced, so as to avoid back ridge overlapping as far as possible
.
The missing and unreasonable setting of the back ridge and screw will cause the aluminum formwork wallboard to be not fixed firmly, which will lead to explosive concrete pouring, affect the appearance quality of concrete structure, and there are certain safety risks
.
The back ridge should be set continuously by the whole bar, and the joints should be staggered, and the lap length should not be less than 400mm; 3
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The side formwork of the wall column aluminum formwork After the installation of each unit, check whether the wall bolts are fixed firmly, the screw holes on both sides should be straight and opposite, and the installation of the back ridge and screw should be fixed firmly with proper force
.
Problem 6: the use of welding for embedded and water and electricity openings, and the use of hole opener for opening ➤ typical examples ➤ hidden danger affects the aluminum mold embedded and water and electricity openings
.
Unqualified setting of back ribs and screws will lead to the movement and bending deformation of aluminum formwork wallboard, resulting in poor concrete forming quality
.
The spacing of pins in the ceiling shall be 25 cm, and all pin holes in the wall headboard shall be filled, so as to prevent explosion points in the expansion mold
.
In the vertical direction, a hole of 30 cm is required
.
When the internal expansion section of the external wall becomes smaller than 5mm, loosen the K-plate to the standard section and then install the external wall
.
➤ preventive measures: the spacing between the pins of the wall column plate is in line with the horizontal direction of 30 cm, that is, there are two pins in the horizontal direction of 400 mm of the standard plate
.
The wall body formwork shall adopt at least four rows of back ribs, and the spacing of split screws shall not be greater than 800mm.
.
When the beam height is more than 1.2 m, the back ridge is set according to the wall formwork for reinforcement
.
