3
.
The joint position of foundation beam is wrong, and it is set according to the joint position of floor frame beam, and it is not staggered (the stress of foundation beam and frame beam is just the opposite, so is the joint)
.
If it is not easy to put in, one end can be processed to 90 degrees first, and then bent to 135 degrees with a wrench after binding
.
According to the requirements of the specification, the transverse stirrup is set at the joint position, and the spacing is min (5d, 100)
.
The reserved length of raft reinforcement joint at the construction joint is not enough, and the joint is not staggered
.
When the beams in several directions intersect and overlap, the upper reinforcement of the beam has no protective layer or even exceeds the beam height, which can be solved by placing the upper longitudinal reinforcement of the secondary beam under the upper longitudinal reinforcement of the main beam
.
7
.
2
.
If the base horse stool is placed in the wrong direction, each row of horse stool can save one full-length reinforcement for fixation
.
The upper slab reinforcement joint should be in the middle of the span, but it is set in the support
.
The length of the longitudinal bar at the bottom of the slab extending into the support is not in accordance with the specification, but the construction is carried out according to the whole support, and the specification is max (5d, 5D, 5d), B / 2) 5
.
The horizontal reinforcement of wall (outside and inside) overlaps at the same position, and the joints are not staggered according to the percentage of joints
.
5
.
The strength of the cushion block is not enough and it is crushed, which leads to the direct contact between the beam and the formwork, and there is no doubt that the reinforcement is exposed
.
The bending inner diameter of the upper longitudinal reinforcement of the roof beam does not conform to the specification, and the specification requirements are > 6D, 8D, but this is generally not possible
.
2
.
4
.
Some concealed columns are very long, and the concealed stirrups are U-shaped
.
If it is done according to the specification, it will almost become fully densified
.
3
.
4
.
The beam lacing bars are omitted or inclined, and some are not bound, which can not play the role of lacing bars
.
6
.
In actual construction, no matter how wide the support is, the longitudinal bar on the upper part of the slab extends into the support La, it is bent for 15d on the opposite side of the support
.
3
.
It is better to use mechanical connection or welding (non electroslag pressure welding) for longitudinal reinforcement of beam, so that it is not necessary to densify stirrup of joint
.
The joint length of the bottom plate longitudinal reinforcement is too long, more than one lap length, and some is too short to meet the length required by the specification
.
The general structural specification does not indicate whether the roof is the simple support or the elastic embedded support of the external wall, and the construction is not carried out according to it
.
The stirrups of column beam joints are not set or the spacing is too large
.
8
.
4
.
The reinforcement joints should be closed stirrups to save reinforcement
.
No bending is set for the top side column
.
2
.
According to 16g101, the outer side of the column may not be bent when the column is overlapped, but the inner reinforcement of the column is required to be bent when the beam height is less than the anchorage
.
10
.
The stirrup of concealed column has internal bending angle, which is allowed under the design
.
The beam joint is not set at the place where the stress is small (the upper longitudinal reinforcement is one third of the middle span), but at the place where the stress is maximum
.
13
.
There is no protective layer on the top formwork of the external reinforcement of the external wall
.
The full-length reinforcement of the bottom plate is not bound in a parallel line, which leads to the different number of reinforcement in the same section
.
The reinforcement of beam support, including the negative reinforcement of the first row of support, extending into the support is l0 / 4 (design problem)
.
15
.
6
.
After the upper and lower steel bars of the beam, including waist steel bars, are all bound, then drop the beam
.
The horizontal reinforcement outside the exterior wall shall be located at one third of the span or one fourth of the wall height, and the inner side of the exterior wall shall be located at the support and near the support
.
3
.
The upper reinforcement of the beam adopts binding joint, but the stirrup is not densified at the joint position
.
4
.
The column beam joint is the core joint, which is the key to earthquake resistance
.
Generally, the bottom reinforcement of the beam is not bound
.
No basement column infill from positive and negative zero above H0 / 3, should be calculated from the top of the foundation
.
It should be 135 degrees
.
2
.
The bending length of the upper and lower longitudinal reinforcement of the raft is set without authorization because the raft edge sealing structure is not in accordance with the specification and design
.
7
.
The pile reinforcement is connected together
.
2
.
6
.
The position of the upper slab reinforcement joint is wrong
.
The non frame beam is non seismic, its stirrup need not be bent to 135 degrees, and the straight section need not be 10 days
.
When the width of the support can not meet the anchorage length, it needs to be bent for 15d
.
The raft has a large area, but the percentage of joint is still 50%, not 25%, which leads to the waste of steel joint
.
Not binding is shoddy, not binding, beam reinforcement entangled in a piece, affect its stress
.
There is no staggered length of column longitudinal reinforcement, which is the problem of reinforcement lofting
.
The construction of beam hook is 90 degrees at one end and 135 degrees at one end
.
Or, the longitudinal bars in the same direction on the upper part of the raft are used for the full-length reinforcement on the horse stool
.
The worker’s excuse is that he can’t bind it
.
The joint of the longitudinal reinforcement of the raft is set in the post pouring zone (the joint of the longitudinal reinforcement should not be set in the post pouring zone)
.
For non torsion non frame beams, the length of the longitudinal bar extending into the support is the anchorage length
.
14
.
8
.
Some are supported directly on the plate with transverse bars
.
Additional stirrups are added on both sides of the main beam at the junction of primary and secondary beams
.
7
.
It is better to put less longitudinal reinforcement in the beam than to omit stirrups in the beam column joint
.
3、 Common mistakes of wall: 1
.
9
.
This is a simple construction process
.
3
.
The percentage of plate joint is 50%
.
The bending of the longitudinal reinforcement of the external wall reduces the protective layer according to the wall thickness
.
9
.
Construction is not carried out according to 25%
.
Three additional stirrups are directly arranged for the main beam instead of normal stirrups at the secondary beam
.
8
.
5
.
6
.
If it meets the requirement and the support is very wide, the reinforcement on the upper part of the slab can be bent, but the bending length plus the length of the straight section in the support is equal to the anchorage length, which is unnecessary, but to the outside of the support It depends on the situation.
.
The bearing platform is not reduced according to the specifications, and the design “optimization” is reduced according to the independent foundation structure, which is a waste of time in design
.
2、 Common errors of column: 1
.
In fact, it is very difficult to do it
.
The construction of suspension bar should be based on the height of secondary beam, and the construction should be based on the height of main beam
.
If the design of non frame beam is based on non seismic consideration, the hook of stirrup can be made into 90 degrees, and the length of straight section is 5D
.
The plane method requires 12 days, which is a waste
.
The remedial measure is to strengthen the hole
.
The position of the second row of reinforcement in the beam is not right, and the distance from the top of the beam is too large, which can not play the role of stress
.
The protective layer of the column does not meet the minimum thickness of the protective layer
.
The binding of wall tie bars is not standard, either the spacing is wrong, or the method is wrong
.
When the wall is capped, the vertical reinforcement of the wall should subtract the reserved length below and then add the lap length
.
4、 Common errors of beam: 1
.
Common errors of foundation: 1
.
According to the specification, the vertical reinforcement outside the basement should be located in the middle third of the wall height, and the vertical reinforcement inside the basement should be located in the root of the wall height
.
When the number of upper and lower reinforcement changes, the length of vertical reinforcement is not adjusted in the lower layer, resulting in the joint not staggered
.
7
.
12
.
In some cases, the upper reinforcement of the beam is set at or near the beam support
.
The practice of the beam cushion block is wrong
.
If the longitudinal reinforcement of the top central column meets the straight anchor in the beam, it does not need to be bent
.
It is difficult to pour the concrete because the spacing of the upper reinforcement of the beam is too close
.
The joint of wall horizontal reinforcement is not set at the minimum stress position
.
5
.
4
.
The angle formed by the intersection or anchorage of two stirrups does not belong to the internal bending angle
.
The overlapping length of slab reinforcement is too long
.
5
.
First, raise the beam and fix it with steel pipe bracket
.
No reinforcement is arranged around the beam opening
.
If the overlapping length of the longitudinal reinforcement of the wall is too long, it is directly determined by the height of the wall
.
Of course, both ends of the hook are processed to 135 degrees
.
It is forbidden to open a hole in the beam, but it is inevitable to open a hole in the beam
.
If the wall horizontal bar is not pulled, or the length of the tie bar is wrong, the construction is not vertical but oblique
.
11
.
The consequences of the exposed reinforcement of the external reinforcement of the external wall are very serious, and eventually the whole external wall is destroyed
.
In fact, he can completely bind it
.
I don’t know what the construction basis is, but I still take it for granted
.
8
.
5、 Common errors of slab: 1
.
The outer side of the external wall is in direct contact with soil and water, and the protective layer is not less than 40mm
.
