A construction method for jacking bridges and culverts with through-core jacks

Abstract

The invention discloses a construction method of jacking a bridge culvert by using a cross-core type jack, and belongs to the technical field of bridge construction. The construction method of jackinga bridge culvert by using a cross-core type jack includes the steps: (1) excavating a jacking working pit in a jacking side of a bridge culvert, and excavating an anchoring working well in the otherside of the front jacking bridge culvert; (2) using a horizontal directional drilling machine to drill horizontal connection holes between the jacking working pit and the anchoring working well to communicate the jacking working pit and the anchoring working well, and threading the horizontal connection holes with steel strands; (3) performing anchoring on one end of the each steel strand in the anchoring working well; and (4) setting a jacking reaction frame on the jacking side, installing a cross-core type jack on the jacking reaction frame, threading the other end of the each steel strand into the cross-core type jack, and taking the jack to pull the steel strands as the power for jacking, so as to realize continuous jacking of the bridge culvert. The construction method of jacking a bridge culvert by using a cross-core type jack has the advantages of being high in construction safety, being high in construction efficiency, and being not limited by the jacking distance, being simple, convenient and quick in construction, being small in the waste of resources for the construction method, and reducing the construction cost.

Description

technical field [0001] The invention relates to a construction method for jacking bridges and culverts with a through-core jack, in particular to jacking construction of bridges and culverts under existing roads and railways, and belongs to the technical field of bridge construction. Background technique [0002] The temporary facilities for traditional bridge and culvert jacking construction mainly include back wall, sliding bed board, jack, passing column and other facilities. The main process principle is to excavate the working foundation pit on the jacking side of the bridge and culvert, construct temporary facilities such as the sliding bed slab and the back wall, lay the isolation layer on the sliding bed slab, and then pour the main structure of the bridge and culvert. Jacks and force transmission columns are set between the back wall and the main body of the bridge and culvert, and the main structure of the bridge and culvert is jacked to the required position throu...

AI Technical Summary

Problems solved by technology

[0003] The traditional jacking construction of bridges and culverts relies on force transmission columns to transmit the jacking force. The main problems are as follows: First, the traditional technology has a greater safety risk: force transmission columns are mostly processed with reinforced concrete or steel components, and must be hoisted by lifting equipment. The space in the working pit is limited, and lifting and hoisting pose a certain threat to the safety of workers, and the force transmission column is prone to jumping out after setting a large number of sections, endangering personal safety

Second, the construction efficiency of the traditional technology is low: the force transmission column is made in multiple sections. Once the jack exceeds the jacking stroke, the force transmission column must be added. The replacement of the force transmission column is very frequent, and the workload of lifting the force transmission column is very large. During the construction process, most of the time was spent on replacing the force transmission columns, while the jacking of bridges and culverts was mostly used in the construction of existing lines. The jacking construction was carried out under the condition of temporarily blocking the existing lines. The jacking must be completed within the blockade time, and the efficiency of the jacking construction has a great impact on the success of the construction

The third is the waste of traditional craft resources, which does not conform to the concept of contemporary green construction: the back wall of the jacking construction is a temporary structure, mostly a reinforced concrete structure, and the volume is generally large. After the jacking construction is completed, it will be abandoned, resulting in A large amount of waste is generated; a large number of force transmission columns need to be prefabricated, transported, turned over, hoisted, and dismantled, resulting in a large waste of resources

Fourth, the jacking distance of the traditional craft is limited: the jacking distance of the culvert is severely restricted by jacking and force transmission columns, and the force of all segments of the force transmission column cannot be on the same axis due to processing errors and the influence of the site environment , once the jacking distance is too long, the force transmission column is very easy to collapse, resulting in the failure of jacking

[0004] The traditional jacking construction technology has problems such as large safety risks, low construction efficiency, large waste of resources, and limited jacking distance. A more advanced jacking method is needed for improvement

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