The job practices of lattice type steel column tower crane pedestal
Technical field
The present invention relates to a kind of construction techniques, particularly relate to the job practices of lattice type steel column tower crane pedestal.
Background technology
In the building trade, the vertical transport of the various constructional materialss on the building site is generally finished by tower crane, and whether steadily tower crane when the big object of hoisting weight operation safety, with tower crane pedestal is whether stable direct relation is arranged firmly.The job practices that tower crane pedestal is commonly used is to make a call to earlier four piles in the position of tower crane now, the body of the tower that on formed column foot, connects tower crane then by its pre-embedded bolt, stable inadequately, the safety of tower crane basis seat of building like this, along with rising progressively of building construction height, for keeping the stable of body of the tower, body of the tower is had to adopt and brace bar attachedly is connected with building.In addition, when large-scale basement or multi-storey basement construction, planar dimension is big because base pit engineering has, and cutting depth is dark, and vertical transport is particularly thorny, characteristics such as the construction plant is narrow and small, tower crane usually need be placed in the foundation ditch, during general way, digs the basement earthwork earlier, on the foundation ditch that digs, build tower crane pedestal again after having dug basement foundation ditch, tower crane is installed again.But, after running into foundation ditch and digging, be subjected to the foundation ditch place place restrictions on can not the foundation ditch that digs in tower crane is installed situation, perhaps must install and use the situation of tower crane during excavation of foundation pit in the foundation ditch position, just be not suitable for the method for above-mentioned construction tower crane pedestal.
Summary of the invention
The purpose of this invention is to provide that a kind of applicability is strong, the lattice type steel column tower crane pedestal job practices of easy construction, for realizing this goal of the invention, the technical solution used in the present invention is such:
The job practices of lattice type steel column tower crane pedestal is characterized in that comprising the steps:
1. make a call to the bored pile that matches with the tower crane body of the tower in four positions on the ground;
2. make laced of battened compression member: with four angle bar, two dual-purpose batten plates are welded into column;
3. laced of battened compression member is welded in the pile cages;
The pile cages that 4. will weld laced of battened compression member is cast in the bored pile;
5. at the laced of battened compression member end face conversion load-bearing steel plate is installed;
6. begin underground excavation and construction, between four laced of battened compression member and around cut the earth, dig certain distance under every, cut the bored pile pile concrete, weld horizontal scissors bracing frame between four laced of battened compression member, the vertical scissors bracing frame of welding between per two adjacent laced of battened compression member;
7. after the underground scholar of digging finishes, below the base plate of foundation pit that digs, construct steel concrete and connect cushion cap, four bored piles are linked together, further fix four laced of battened compression member.
Further, 5. above-mentioned steps can install the body of the tower base section afterwards on conversion load-bearing steel plate.
Mounting method between described laced of battened compression member, conversion load-bearing steel plate and the body of the tower base section is: pass conversion load-bearing steel plate and the welding of laced of battened compression member end face angle steel with one end of the anchor bolt on the body of the tower base section, again with laced of battened compression member end face angle steel and the welding of conversion load-bearing steel plate, and between laced of battened compression member side and conversion load-bearing steel plate bottom surface, weld the triangle stiffener, then the body of the tower base section is connected with the anchor bolt other end.
After described body of the tower base section installs, on the body of the tower base section, body of the tower can be installed.
Above-mentioned steps 7. after, aerated concrete building block or coarse sand separation layer can be set connecting between cushion cap and the base plate of foundation pit.
The described step 3. welding method of laced of battened compression member and pile cages is: laced of battened compression member and the bar welding of pile cages master muscle group, its lap length is no less than 3 meters.
Adopt the job practices of above-mentioned lattice type steel column tower crane pedestal, can before soil excavation, install tower crane earlier, the limit is dug the following cubic metre of earth limit of tower crane and is reinforced this tower crane pedestal with vertical support frame and horizontal shore, below base plate of foundation pit, construct steel concrete after foundation ditch digs again and connect cushion cap, further reinforce tower crane pedestal, can also be with already installed tower crane transportation cubic metre of earth when digging following cubic metre of earth of tower crane, this method easy construction, applicability is stronger, must install and use the situation of tower crane when particularly suitable is subjected to foundation ditch place restriction that the situation of tower crane or excavation of foundation pit can not be installed in the foundation ditch that digs in the foundation ditch position.The tower crane pedestal Stability Analysis of Structures of building with this method, firmly, safety is higher.
Description of drawings
Fig. 1 is for building the sectional drawing of the lattice type steel column tower crane pedestal that finishes.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Fig. 3 is the B-B sectional drawing of Fig. 1.
Fig. 4 is the connection diagram of conversion load-bearing steel plate and laced of battened compression member.
Fig. 5 is the C-C sectional drawing of Fig. 4.
Fig. 6 is horizontal scissors bracing frame schematic diagram.
The specific embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, present embodiment is the job practices of lattice type steel column tower crane pedestal, and concrete construction sequence is as follows:
1. make a call to the bored pile 1 that matches with the tower crane body of the tower in four positions on the ground;
2. make laced of battened compression member 3: four angle bar, 8, two dual-purpose batten plates 9 are welded into column;
3. laced of battened compression member 3 and pile cages 2 main muscle are helped the bar welding, its lap length is 3.5 meters;
The pile cages 2 that 4. will weld laced of battened compression member 3 is cast in the bored pile 1;
5. pass conversion load-bearing steel plate 4 and 8 welding of laced of battened compression member 3 end face angle steel with anchor bolt 11 1 ends, again laced of battened compression member end face angle steel 8 and conversion load-bearing steel plate 4 are welded, and between laced of battened compression member 3 sides and conversion load-bearing steel plate 4 bottom surfaces, weld triangle stiffener 10;
6. on conversion load-bearing steel plate 4, the body of the tower base section is installed;
7. the tower crane body of the tower is installed on the body of the tower base section;
8. begin underground excavation and construction, between four laced of battened compression member and around cut the earth, dig certain distance under every, cut the bored pile pile concrete, weld horizontal scissors bracing frame 5 between four laced of battened compression member 3, the vertical scissors bracing frame 6 of welding between per two adjacent laced of battened compression member 3;
9. after the underground scholar of digging finishes, below 12, construct steel concrete and connect cushion cap 7, four bored piles 1 are linked together, further fix four laced of battened compression member at the base plate of foundation pit that digs; 10. between described connection cushion cap 7 and base plate of foundation pit 12, be provided with and add coarse sand separation layer 13.