Hollow truss compound core formwork

Abstract

The invention discloses a hollow truss compound core formwork. The hollow truss compound core formwork comprises an upper cover frame, a lower cover frame and middle support frames; the upper cover frame and the lower cover frame are each of a truss structure; the upper cover fame comprises an upper cover outer frame which is formed by upper side beam trusses in an enclosure mode and an upper horizontal drawing truss, and the upper horizontal drawing truss is located in and connected with the upper cover outer frame; the lower cover frame comprises a lower cover outer frame formed by lower side beam trusses in an enclosure mode and a lower horizontal drawing truss, and the lower horizontal drawing truss is located in and connected with the lower cover outer frame; each middle support frame comprises support rods and a horizontal drawing rod connected between the adjacent support rods; the outside of the upper cover frame, the lower cover frame and the middle support frame is sleeved with a flexible bag. The invention aims at providing the hollow truss compound core formwork which has the good mechanical property in all directions, the core formwork is a combined type core formwork, all the parts are disassembled during transportation, the transportation space and the transportation cost are saved, all the parts can be connected rapidly when construction is conducted, and assembly and disassembly are very convenient.

Description

technical field [0001] The present invention relates to mandrels for use in walls or floors in construction. Background technique [0002] In the past, most buildings in our country were reinforced concrete structures. This kind of structure consumes a lot of building materials and is very heavy. Especially for the floor slab, the middle part is generally suspended, so the strength of the floor slab is low. For this reason, the country advocates the use of cast-in-place hollow slab technology to realize the construction of the slab. In this way, not only can the consumption materials be reduced, but also the weight of the slab can be reduced. [0003] At present, the technology of adopting cast-in-place hollow-core slabs is mainly as follows: first build the formwork, then lay the lower steel bars on the formwork, fix the mandrel on the lower steel bars, then set the upper steel bars on the mandrel, and finally pour concrete. [0004] However, most of the existing mandrels ...

AI Technical Summary

Problems solved by technology

In this structure, the basin formwork and the spine keel can be disassembled, so the transportation space can be reduced. However, when the formwork components are used to form the hollow floor slab, the concrete is completely covered on the formwork components. Before it is completely solidified, the pot-shaped mold needs to be able to withstand large vertical and lateral forces, and because the formwork member is a hollow structure, the pot-shaped mold is suspended except for the edge, and the cross-section of the pot-shaped mold is similar to Plate structure, therefore, the pot-shaped formwork has poor mechanical properties and is prone to deformation. Once the formwork components are deformed, there will be a collapse at the formwork components, which will affect the pouring of the hollow floor slab

[0007] In the Chinese patent application number 200710200786.1, the application date is 2007.6.7 and the publication date is 2008.12.10, a concrete hole-forming mandrel is disclosed, and a trumpet tube is provided in the middle of the basin-shaped part, and the horns of the upper and lower basin-shaped parts are disclosed. When pouring concrete, the concrete flows in through the trumpet pipe, which improves the integrity of the floor. Although the trumpet pipe can improve the vertical force performance of the middle part of the concrete hole mandrel, the pot-shaped part is a shell structure, and there are many consumables. It needs to be formed by a special mold, and the cost is high. Moreover, when pouring concrete, the concrete has vertical and lateral extrusion forces on the concrete hole-forming core mold, and the concrete hole-forming core mold is easily deformed.

[0008] In the Chinese patent No. 200610108872.5, the application date is 2006.8.17 and the publication date is 2007.5.2. A hollow tire mold is disclosed, which includes a truss and a flexible soft hollow tire mold. The truss has better support for the hollow tire mold. Function, when pouring concrete, it can realize the transmission of force. However, referring to the specification and drawings of this patent document, the truss is mainly arranged on the side, and the top and bottom of the hollow membrane are only flexible and soft hollow tire molds, and there is no Any truss is used for support. Therefore, when pouring concrete, the concrete is prone to collapse on the top of the hollow tire mold under its own gravity, and even the phenomenon of tearing the flexible and soft hollow tire mold will occur. There is a hollow tire mold bearing In the case of unreliable force, and once a collapse occurs, concrete needs to be added to the collapsed part, resulting in an increase in the amount of poured concrete and an increase in the weight of the floor or wall. Phenomenon, concrete will enter the hollow tire mold, it is difficult to form a hollow floor or wall, and it will increase the amount of concrete

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