Large-scale bent cap semi-prefabrication construction technical method

Abstract

The invention discloses a large-scale bent cap semi-prefabrication construction technical method. Firstly, a bent cap open groove type shell is prefabricated in a prefabrication yard and then transported to a site to be lifted, inner concrete is poured in place with the bent cap open groove type shell as a template, and therefore a large-scale bent cap is manufactured. The method specifically includes the following steps of manufacturing of the open groove type shell template, first-time concrete pouring, rough chiseling, transportation and lifting, reinforcing steel bar framework and anti-expansion pull rod intra-groove installation, second-time concrete pouring, prestressed bar tensioning and anchor sealing. By the adoption of the construction technical method, in the aspect of structure prefabrication, a site support is not needed due to the semi-prefabrication form, and the influence degree of the environment of the construction site is reduced; in the aspect of component safety, the integrity of the prefabricated bent cap shell is better than that of a bent cap prefabricated and spliced segment by segment, and the stress concentration phenomenon is unlikely to happen; and in the aspect of transportation and lifting, the overall weight of the semi-prefabricated bent cap shell is smaller than that of the fully-prefabricated bent cap, and no complex heavy machine is needed during transportation and lifting.

Description

technical field [0001] The invention belongs to the technical field of municipal bridge construction, and in particular relates to a semi-prefabricated construction method of a large cap beam. Background technique [0002] The traditional method of making cover beams is cast-in-place, but for urban interchanges, cast-in-place will affect the use of existing roads, and at the same time require a full range of supports; in poor geological environments, it is not suitable for the organization of support systems. In addition, supports Special design procedures are complex and require a lot of manpower and time resources. [0003] At present, the call for the development of bridge construction towards green construction and civilized construction is getting louder and louder. Most of the existing assembled cap beam schemes are fully assembled schemes. The fully assembled scheme may have the following problems: 1. There are seams on the outer surface of the concrete, which are eas...

AI Technical Summary

Problems solved by technology

[0002] The traditional method of making cover beams is cast-in-place, but for urban interchanges, cast-in-place will affect the use of existing roads, and at the same time require a full range of supports; in poor geological environments, it is not suitable for the organization of support systems. In addition, supports Special design procedures are complex and require a lot of manpower and time resources

[0003] At present, the call for the development of bridge construction towards green construction and civilized construction is getting louder and louder. Most of the existing assembled cap beam schemes are fully assembled schemes. The fully assembled scheme may have the following problems: 1. There are seams on the outer surface of the concrete, which are easy to Water seepage and water leakage occur, which affects durability; 2. The longitudinal reinforcement is segmented and discontinuous on the segment interface, so it cannot transmit force continuously; 3. There is a fitting error on the splicing surface, and stress concentration will occur; 4. Multi-segment assembly Multiple cranes are required to work in coordination, which increases the difficulty of control; 5. Although there are many prefabricated cover beam full assembly schemes, more assembly schemes still need to be proposed to meet the construction needs in different situations; 6. Multiple Segmental assembly requires repeated hoisting operations, and the command and hoisting personnel are prone to fatigue, which affects the construction quality; 7. The matching accuracy of the segmental splicing surface is high, which increases the control requirements of the prefabrication stage, prolongs the necessary labor time for prefabrication, and indirectly prolongs the Total project duration

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