37results about How to "Reduce Temporary Support" patented technology

The invention discloses a reinforced excavation method for a shaft of a subway of a weak water formation. The reinforced excavation method for the shaft of the subway of the weak water formation comprises the following steps of (1) performing vertical reinforcement; (2) performing vertical local excavation; (3) performing transverse reinforcement; (4) performing transverse expanding excavation; (5) performing shaft lining; (6) monitoring deformation; (7) repeating the step (1), the step (2), the step (3), the step (4), the step (5) and the step (6) and excavating the formation to a designed elevation; and (8) bottom plate pouring: performing pouring on the bottom of the shaft after the formation is excavated to the designed elevation. Compared with the traditional excavation method, the layered and segmented excavation method has the advantages that the stability of the shaft can be guaranteed well and safety of construction is improved greatly. A water stopping effect can be high by layered and segmented reinforcement and excavation, circumstances of water burst, mud burst and the like in an excavation process are avoided, and the method is particularly suitable for excavating the shaft of the weak water formation. By the layered and segmented excavation, the stability of the shaft is improved greatly, the construction risk is greatly reduced, and the social benefit and the economic benefit are high.

The invention discloses a foundation pit enclosure system using an underground diaphragm wall as a vertical cantilever supporting point and a construction method. The foundation pit enclosure system comprises a basement, wherein the basement is mainly formed by correspondingly connecting basements located in the peripheral region of a foundation pit and basements located in residual regions of the foundation pit through respective floor slabs. Each basement located in the peripheral region of the foundation pit comprises the underground diaphragm wall, lateral shear resisting walls and floor slabs, the underground diaphragm wall is arranged along the circumference of the inner wall of the foundation pit and serves as the peripheral edge of the peripheral region of the foundation pit, the inner edge of the peripheral region of the foundation pit serves as a boundary for the central region of the foundation pit and the peripheral region of the foundation pit, the lateral shear resisting walls are distributed in the peripheral region of the foundation pit, and the floor slabs are arranged on the lateral shear resisting walls and the underground diaphragm wall in a layered mode. The lateral shear resisting walls serve as supporting structures at an early stage and are also the constituent parts of a main body structure, so that the problem that temporary supports are needed to be erected in construction and then are needed to be removed in the prior art is solved, construction difficulty is simplified, a construction period is shortened, and construction cost is reduced.

The invention discloses a fabricated shear wall dry-wet mixed connection method. The left ends and the right ends of upper-layer prefabricated wall plates and lower-layer prefabricated wall plates areconnected in a positioned mode through nuts, and then cast-in-place shearing force key structures are formed in the middles of the upper-layer prefabricated wall plates and the lower-layer prefabricated wall plates. According to the fabricated shear wall dry-wet mixed connection method, four steel bar connectors are arranged at the two ends of each upper-layer wall plate correspondingly, groovesare formed in the bottoms of the upper-layer prefabricated wall plates, concrete is poured into the grooves to form the shearing force key structures, connecting steel bars anchored on the lower-layerprefabricated wall plates are locked on the steel bar connectors, and thus the connecting structures of the upper-layer prefabricated wall plates and the lower-layer prefabricated wall plates are convenient to construct and reliable in performance; and the advantages of dry-type connection and wet-type connection are combined, the problems that as for an existing connecting mode, on-site construction is difficult, and the quality is not prone to being ensured are solved effectively, the construction process can be simplified, the assembling quality is improved, the mechanical performance of ashear wall after assembling is improved, and the purpose of reducing cost is achieved.

The invention discloses a tooth-groove-type connection structure of an upper-layer inner wallboard of an assembly-type shear wall and a lower-layer inner wallboard of the assembly-type shear wall. Each inner wallboard comprises two contact locating structures of the upper-layer inner wallboard which are respectively arranged at two ends of each wallboard and a post-pouring concrete structure. The post-pouring concrete structure is located between the two contact locating structures. Upper grooves are formed in the bottom surface of the upper-layer inner wallboard, upper tooth-shaped grooves are formed in the bottoms of the upper grooves, and vertically-distributed rebars of the upper-layer inner wallboard stretch out from the upper grooves. Lower grooves are formed in the top surface of the lower-layer inner wallboard, lower tooth-shaped grooves are formed in the bottoms of the lower grooves, and vertically-distributed rebars of the lower-layer inner wallboard stretch out from the lower grooves. When the upper-layer inner wallboard is connected with the lower-layer inner wallboard, notches of the upper grooves are connected with notches of the lower grooves in a butt joint mode, forming grooves of the post-pouring concrete structure are formed, and the vertically-distributed rebars of the lower-layer inner wallboard and the vertically-distributed rebars of the upper-layer inner wallboard are correspondingly connected in a lap joint mode. The tooth-groove-type connection structure of the upper-layer inner wallboard of the assembly-type shear wall and the lower-layer inner wallboard of the assembly-type shear wall is easy and convenient to construct and reliable in structure.

The invention discloses a fabricated shear wall joint structure and a splicing method thereof. The joint structure comprises positioning bulges which are embedded with each other at the joint of adjacent wallboards, vertical hoop steel bars which are arranged at the other positions of the joint of the adjacent wallboards and distributed between the wallboards in a staggered manner, cast-in-place concrete which is filled in the joint space where the vertical stirrups are located, and full-length steel bars which penetrate through all the positioning bulges and the cast-in-place concrete at thesame time and are fixedly connected with the vertical hoop steel bars. According to the invention, vertical closed U-shaped hoops are connected with the positioning bulges; the mounting in-place accuracy of a fabricated shear wall and the stability during construction and mounting are ensured; temporary supports during shear wall construction are reduced, connection is reliable, construction is convenient, the construction speed is high, the horizontal full-length steel bars are arranged at the joints to form a steel reinforcement cage, concrete is cast in place with shear wall edge restraining components to form a shear wall structure with the hidden frame structure, and the fabricated shear wall joint structure has the advantages of being good in integrity and anti-seismic property and the like.

The invention relates to a building structure assembled by concrete dense rib plate box body units. Concrete dense rib plates are adopted for prefabricating box body units, the box body units are connected and fixed with each other through screw bolts to form the building structure, the concrete dense rid plates are used as load bearing walls and floor slabs of the box body units, and the concrete dense rib plates are connected and fixed through screw bolts. The box body units of the invention can realize standardized and industrialized production, have reliable quality, save the building time and the building cost, and have the advantages of precision, high speed, economy and no pollution.

The invention belongs to the field of prefabricated building construction, and in particular relates to an integrated design and construction method of prefabricated shear wall post-cast ring beam formwork and slab support. The steps are: 1. Determine the formwork system calculation model; 2. Formwork system bearing Force checking; 3. Determine the calculation model of the prefabricated slab support system; 4. Check the bearing capacity of the precast slab support system; 5. Determine the material of the formwork system components; 6. Make the back corrugated; 7. Make the formwork; 9. Making the inner support of the formwork; 10. Installing the formwork; 11. Hoisting the prefabricated panels; 12. Pouring concrete. The invention solves the key technical problems such as difficulty in fixing the post-cast ring beam formwork, grout leakage and displacement at the bottom of the slab, realizes the integration of the formwork and the prefabricated slab support, saves the support of the prefabricated slab, and makes the post-cast ring beam meet the requirements of fair-faced concrete. High degree of standardization, factory production, prefabricated installation, repeated recycling, in line with national environmental protection and energy saving requirements.