Precautions for installation and disassembly of assembled steel composite support
The cross construction precautions involved in the installation and demolition of assembled steel composite support are as follows: 1. Earthwork excavation: (1) Earthwork excavation shall be carried out in accordance with the principle of "supporting before digging, layered symmetrical excavation, and overdigging is strictly prohibited". No earthwork excavation shall be carried out on the soil within the steel support area before the steel support is prestressed. (2) It is strictly prohibited to pile load on the steel structure support when digging. The steel structure support is the overall stress system, and the additional load on the support will lead to the instability of the steel support structure, which will affect the safety of the project.
Details >Preparation for construction of prefabricated steel composite bracing
The main basic materials and facilities in the construction stage of assembled steel composite support are: steel, supporting components and accessories, stacking site; Construction machinery and tools such as digging machine, crane, air compressor, electric welding machine, etc.; On-site office and living area. According to the different construction stages, dynamically optimize the layout of the site, according to the actual situation reasonable arrangement of the process, to ensure the smooth construction.
Details >Prestressed steel composite bracing
Prestressed fish-belly foundation pit steel support technology is a kind of composite steel support, is based on the principle of prestress, through a large number of engineering research and practical application, aiming at the traditional concrete inner support and steel support on the foundation pit deformation control ability of the lack of a deep foundation pit support structure system.
Details >Construction procedure of high pressure rotary jet grouting pile
The following are the construction steps of high-pressure rotary jet grouting pile taking a project as an example: 1. Determination of pile position: According to the construction axis of the design drawing, measurement of pile position. 2, drilling into a hole: in order to prevent drilling deflection, drilling rig installation should be stable, the fuselage should be horizontal, the sky wheel, vertical axis, drilling center should be on a vertical line, the hole position deviation is not more than 50mm. Complete records should be recorded in the process of drilling. After the final hole, plug the hole with a woven bag to prevent sundries from falling into the hole.
Details >Introduction to section steel combination support
Prefabricated composite steel support prestressed fish-belly foundation pit steel support technology is based on the principle of prestress, through a large number of engineering research and practical application, aiming at the shortage of traditional concrete inner support and steel support, a new type of deep foundation pit inner support structure system is developed.
Details >Prestressed fish belly beam prefabricated steel support components and supporting principle
Prestressed fish belly beam prefabricated steel support is composed of vertical retaining wall, prestressed fish belly beam, prepressed jack, enclosing purlin, Angle brace (counter brace), beef leg, triangular connector, vertical column, plane displacement detection system, prestressed monitoring system, and construction force monitoring system.
Details >Introduction to assembled steel bracing
Prestressed prestressed steel support system is composed of fish belly beam (composed of high strength and low relaxation steel strand as winding component, H-shaped steel as stress beam, and H-shaped steel support beam of different lengths, etc.), counterbrace, Angle brace, pressure beam, tie rod, triangle bond, pressure device, column and other components of the stress system.
Details >Construction method of undisturbed earth - filling pile
Original soil filling pile construction method1The excavation of the pipe jacking pit shall be carried out according to the construction scheme and specific environment. The length and width of the pit depend on the soil, the diameter and length of the top pipe section, the mechanical equipment, the pipe down and the method of excavation. In addition to installing the back of mechanical equipment for pipe jacking, guide rail and pipe jacking section, the working pit is also conducive to excavation and operation of staff outside the pit.
Details >Construction technology introduction of undisturbed earth taking and filling pile with full retaining cylinder1The undamaged soil taking and filling pile with full retaining cylinder is drilled and cut into soil by double power drill with built-in spiral blades in full retaining cylinder to form pile diameter;2Take out the soil in the protective tube without the original condition;
Details >Construction requirements of undisturbed soil pouring concrete pile with full guard cylinder
The construction of intact earth taking and filling pile with full protective cylinder includes the steps of construction preparation, positioning and laying out, drilling, pumping concrete, inserting reinforcement and pulling out protective cylinder.
Details >Hong Kong airport is the biggest challenges facing the third runway construction aspect, before the project starts, sea DCM (mixing pile), land DCM (mixing pile), PVD (drain) in the sea, land gravel pile foundation treatment technology such as are for Japan, South Korea, the monopoly of international advanced technology, before and after the tender, the foreign counterparts enterprises of our country executes strict technology blockade. For this reason, the strong foundation has carried on the thorough research. After more than two years of continuous fighting day and night, countless scientific research, testing and adjustment, we have overcome the difficulties of equipment manufacturing and construction technology of PVD (drainage board) engineering ship, DCM (mixing pile) engineering ship, onshore gravel pile machine, and onshore DCM pile machine, and successfully mastered the core technology.