Turn-over formwork system and construction method of hollow concrete leaning tower

Abstract

The invention discloses a turnover formwork system of a hollow inclined concrete pylon and a construction method thereof. The system comprises a vertical load-bearing steel joist (12); the lower half of the vertical load-bearing steel joist (12) is connected with a poured section of an inclined pylon (13); the upper half of the vertical load-bearing steel joist (12) is connected with a section where inner form boards (1) and outer form boards (3) are set up but the concrete is not poured. Key points of the method are that the inner and outer form board system of the section just poured is retained, and the inner and outer form board system of the section which is below the section just poured is removed; turning the removed inner and outer form board system to the section above the section just poured and reassembling the form board system, strapping a reinforcement cage and fixing load-bearing anchors (11) of the section on the reinforcement cage, fixing the lower half of the vertical load-bearing steel joist (12) with the concrete section just poured, fixing the upper half of the vertical load-bearing steel joist (12) with the section not poured, and then pouring concrete. The system and the method can reduce the coherent-wall load.

Description

technical field [0001] The invention relates to the construction technology of a hollow concrete leaning tower in the field of civil engineering, in particular to a construction method of a flip-type formwork system of a hollow concrete leaning tower and a formwork system of a hollow concrete leaning tower. Background technique [0002] With the development of national construction, especially the vigorous development of traffic engineering infrastructure such as roads and bridges, cable-stayed bridges have also been more and more widely used. There are towering hollow concrete pylons in the structure of cable-stayed bridges, which are used to hang slings to support the bridge deck. As the spans of the bridge decks on both sides of the bridge pylons are different, the bridge pylons need to be set as tapered leaning towers. The hollow concrete leaning tower of the prior art adopts the hydraulic climbing formwork device to construct. [0003] However, the hydraulic climbing m...

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Problems solved by technology

[0003] However, the hydraulic climbing mode construction device and construction method of the prior art have the following disadvantages: First, the hydraulic climbing form device has a complex structure, including a formwork system, a frame body, an operating platform, a hydraulic climbing device, etc., so its own weight is relatively large. The self-weight of the stand is about a few tons, and the self-weight plus the construction load will lead to a greater load on the attached wall, and because the tower body is inclined, the above-mentioned attached wall load will form a large bending moment at the root of the inclined tower, resulting in a large tensile stress The cracking of the concrete in this part makes the construction of the leaning tower structure unsafe; secondly, the cost of the hydraulic climbing formwork device is high, which increases the construction cost; The size of the horizontal section is constantly shrinking, so the shape of the inner and outer formwork needs to be constantly shrinking, and the hydraulic climbing formwork system is obviously more suitable for a straight up and down structure rather than a tapered structure with a small top and a large bottom

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