Construction method for tunnel bridge construction joint sealing system

Abstract

The invention relates to a construction method for a tunnel bridge construction joint sealing system. The construction method comprises the steps that two U-shaped grooves are formed in the side wall of a frame bridge and the front end face and the rear end face of a bottom plate; a water-swelling sealing strip is installed in each U-shaped groove; the side wall and the front end face and the rear end face of the bottom plate with the water-swelling sealing strips installed are painted with a concrete adhesion agent; concrete is poured into an approach bridge formwork, and it is needed to be noted that strengthening ramming is conducted on joints in the ramming process. The construction method for the tunnel bridge construction joint sealing system has the advantages that the adhesion agent is transparent liquid, and thus the quality and the attractiveness of engineering are hardly influenced. Compared with cement which is permeable, the adhesion agent is waterproof, capable of being crystallized, and better in waterproof effect; the water-swelling sealing strip can swell with water in a narrow space and can fully prevent underground water from seeping into concrete. A multiple water blocking system can be formed, and the waterproof effect can be effectively ensured. The waterproof quality of engineering can be ensured while the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel bridge construction, and in particular relates to a construction method of a water stop system for construction joints of tunnel bridges. Background technique [0002] With the rapid development of my country's railway construction, underpass tunnel bridges have gradually replaced level crossings. Underpass tunnel bridges are mainly composed of frame bridges and front and rear approach bridges; at present, the commonly used construction method for this underpass tunnel bridge is: first excavate a foundation pit on the side of the railway line where the underpass tunnel bridge is to be installed, and then The frame bridge is prefabricated in the foundation pit, and then the above frame bridge is jacked under the railway line by jacking method, and then the approach bridge construction as the post-casting section is carried out at the front and rear ends of the frame bridge, so that the frame bridge ...

AI Technical Summary

Problems solved by technology

Since the frame bridge with the above structure cannot be equipped with water-stop materials such as water-stop belts before jacking, in order to ensure the waterproof quality of the construction joints in the post-casting section, it is usually necessary to chisel the side walls of the frame bridge and the front and rear end faces of the bottom plate, and then Before the construction of the post-casting section, apply cement-based permeable waterproof crystals on the above-mentioned end faces to enhance the adhesion between concrete and fill the gaps between concrete, so as to increase the distance between the concrete structure of the post-casting section and the concrete structure of the existing frame bridge. Connectivity, but because the construction materials cannot ensure that the construction joints are completely tight, groundwater will infiltrate upwards along the gaps, eventually causing water bleeding on the surface of the concrete structure

At this time, only the follow-up glue injection construction method can be used to remedy, so it will have a great impact on the social benefits and aesthetics of the project

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