The project department will provide the weight parameters and layout location of the elevator to the design institute in advance.
4.
Optimization method: except along the wall, it should be non-densified.
9.
According to the provisions of Page 16G101-1P74, if the top end of the vertical reinforcement of the shear wall is a frame beam and the beam height meets the requirements of direct anchor, the direct anchor can be used.
The starting distance of the wall vertical reinforcement is normal practice: start at 50mm.
The starting distance between the upper and lower reinforcement of the floor is generally 50mm.
Optimization method: start according to 1/2 plate rib spacing.
11.
All tower crane foundations fall into the foundation raft.
10.
Optimization of the root of the outer wall of the bottom plate.
The overlap node between the lower plate and the lower column pier.
8.
2.
There are 8 elevators in the project.
After optimization, the falling plate area can meet the anchoring length.
II.
Optimization method: start according to the spacing S of one wall vertical bar.
On site, the vertical reinforcement of the main building wall is 100% overlapped (1.2LaE renderings).
After the optimization of the original design node, the node is implemented on site.
Effect: 496 column piers in total for pits A and C.
Foundation 1.
Optimization method: encrypt by 100mm.
The failure of large eccentric compression is tensile failure, and the failure of small eccentric compression is compressive failure.
Optimization method: except the corner bar to the bottom, insert an anchor LaE underneath.
However, the current reinforcement engineering is generally managed in an extensive manner, lacking unified planning, and measures such as reinforcement, connection mode, anchor nodes, and combination of length and length are not considered in advance, resulting in a large amount of reinforcement cutting waste and a low utilization rate.
The end of the wall horizontal reinforcement is bent and placed inside the column longitudinal reinforcement.
The column pier reinforcement is larger in size and smaller in spacing than the raft reinforcement.
There are 11 tower cranes in the project.
The actual corner wall of the main building and garage on the site is implemented according to the effect picture 8 of the inner side of the horizontal reinforcement hook.
With the consent of the design, HRB40022 is changed to HRB40014, reducing the use of large-diameter reinforcement.
The same method is also adopted for the reinforcement of the wall column of the main building.
The conventional practice of the joint between the top beam stirrup and the beam and wall: the beam ends shall be densified.
(The diameter of reinforcement is included) 3.
Normal practice of vertical anchor of internal wall reinforcement: insert it all down to the raft bottom.
The bottom reinforcement of the original design bottom plate is directly connected to the edge of the raft.
According to the provisions of Page 3-13 of 18G901-1, S=a wall vertical spacing=the starting bar of the wall vertical reinforcement should be a vertical spacing from the column edge.
Most of the column piers in the underground space are 5 * 5 * 1.2m, with reinforcement 25@120 , 42 on each side; Now optimize @ 120 to @ 123, that is, bind 41 on each side (less than one 7.14 m long 25 longitudinal bar on each side).
The height of the column pier is more than 1400mm, the joint bars at the four corners of the column are inserted to the bottom and bent, and the other longitudinal bars are anchored with laE.
The starting bar of the wall vertical reinforcement is a vertical distance from the concealed column edge.
The fundamental difference between the anchorage of column longitudinal reinforcement in the foundation is whether the tensile reinforcement yields.
The raft thickness is divided into 1.6m and 0.6m.
The starting distance between the upper and lower bars of the garage roof is 50 mm.
7.
The raft reinforcement is designed to be arranged according to the column pier.
The elevation control should be paid attention to when the anti-floating anchor rod replaces the stirrup bar.
The starting bar of the wall vertical reinforcement is one vertical distance from the side of the concealed column.
6.
After optimization, the raft reinforcement and column pier reinforcement are respectively reinforced, and the reinforcement at the crossing raft is the original raft reinforcement.
3.
The vertical reinforcement (supporting the upper reinforcement mesh) on the stirrup is used to replace the upper reinforcement of the raft in the same direction.
9.
So, how to optimize reinforcement in construction engineering? Let’s take the project of China Construction Eighth Engineering Bureau as an example to see how the construction site can reasonably save steel bars? Part 1 of shear wall: 1.
The wall vertical reinforcement can be 100% overlapped on the floor.
4.
5.
The horizontal reinforcement of the lower column pier slope belongs to the structural reinforcement, and the main reinforcement of the garage raft diameter is adopted.
According to the provisions on page 73 of the atlas 16G101-1P73, the vertical reinforcement of the non-bottom reinforcement of the shear wall with seismic grade I and II or the shear wall with seismic grade III and IV can be 100% overlapped at the same part, with the overlapping length=1,2LaE.
Optimization method: start according to 1/2 plate rib spacing.
Source: In the construction engineering of Luban Union, reinforcement accounts for the largest proportion of all disciplines and materials, up to about 30%.
General practice of anchoring non-angle reinforcement of concealed column in raft: all concealed column reinforcement is inserted into raft bottom.
In the 0.6m thick raft area, considering the increase of tower crane foundation counterweight, after the communication between the project department and the design institute, the design institute calculates according to the tower crane foundation counterweight, each tower crane foundation can reduce 5 anchor rods, which reduces the site construction period, saves the waste of tower crane foundation reinforcement, and creates benefits for the project department.
The design institute will calculate and recheck according to the elevator parameters provided by our company, strengthen the beam and slab reinforcement at the corresponding location of the elevator layout, and issue the design change drawings, and use the main structure as the elevator foundation.
Optimization method: meet the length of the straight anchor, save the length of the straight anchor and elbow.
The vertical reinforcement of the wall column in the basement and garage reaches the top at one time, reducing the use of straight thread sleeve and saving the binding and overlapping length of reinforcement.
After the optimization of the original design node, the node is implemented on site.
The secondary utilization of short material is realized by replacing measure reinforcement with anti-floating anchor bar reinforcement.
2.
The conventional method for saving stirrups at the overlap of vertical bars of concealed columns: 100mm and 5d shall be the maximum.
The raft reinforcement in the 1.6m thick raft area is the same as that of the tower crane foundation, both of which are HRB40025@200 Double-layer and two-way, the raft reinforcement and tower crane foundation reinforcement are shared on the site to reduce the waste of tower crane foundation reinforcement.
The reason for large and small eccentric compression failure is that the large eccentric pressure deviates from the axial center of the member far than the small eccentric, and the bending moment generated by compression is relatively large, so the member is equivalent to bending failure.
.
7.
According to the provisions of Page 71 of Atlas 16G101-1P71, the horizontal reinforcement of the wall should be bent close to the inner side of the longitudinal reinforcement of the column.
On-site implementation 5.
6.
The tower crane foundation and elevator foundation are constructed using the main structure.
The vertical reinforcement capping end of the wall can be directly anchored.
Therefore, reinforcement optimization is crucial and directly related to the project benefits.
