Railway large-bore tunnel oval-shaped table-board cap brim bias-cutting type hole-door construction method

Abstract

The present invention relates to the art of railway tunnel construction technology, in particular to a brim-type clip portal construction method of an oval platform of a railway large cross-section tunnel, which solves the problems of the simple separated template technology, such as complicated template installation, the large deviation of structural size and many construction joints. (1) an internal mode, an external mold and an end mold of the brim are manufactured; (2) the hookup lines of the upper mouth and the lower mouth of the internal mold and the external mold are confirmed; (3) the internal mold is arranged according to the hookup lines of the upper mouth and the lower mouth; (4) a brim reinforcing steel bar is colligated; (5) the external mold of the brim is arranged according to the hookup lines of the upper mouth and the lower mouth; (6) the hookup control line of the end mold of the brim is confirmed and then an alternative installation method is adopted; (7) a brim concrete is symmetrically poured. The present invention has the advantages of convenient mechanical construction, small labor investment, multi-faceted parallel operation, simple template installation, high work efficiency and less deviation of structural size, thus ensuring the smooth and pleasing appearance and size; one-time pouring and less construction joints, thus strengthening the waterproof performance of the bright door and the portal.

Description

technical field

[0001] The invention relates to the technical field of railway tunnel construction, in particular to a construction method for a large-section railway tunnel with an elliptical tabletop hat brim obliquely cut type portal. Background technique

[0002] Known, the construction method of oblique-cut type portal of elliptical table top hat brim in railway large-section tunnel comprises three steps, namely open hole construction, oblique section construction and hat brim construction, and wherein hat brim construction is the emphasis and difficulty of this type portal construction. At present, most of the brim construction adopts the simple separate formwork technology. In the actual construction, there are the following problems. Mechanized construction is not possible, the efficiency is low, and the progress is slow; repeated measurement of lofting, formwork and reinforcement is required, and the formwork reinforcement takes a long time and consumes a lot of labo...

Examples

Embodiment Construction

[0015] A method for constructing a large-section railway tunnel with an elliptical platform hat brim obliquely cut type portal, comprising open hole construction, oblique section construction and hat brim construction, the hat brim construction comprising the following steps: (1) making the inner hat brim according to the size and shape of the tunnel section The templates of the contour surface, the outer contour surface and the top surface, that is, the inner mold, the outer mold and the end mold, as shown in Figure 1, the inner mold is composed of elliptical contour lines a and c, and the outer mold is composed of elliptical contour lines b and d. The bottom surface of the hat brim is the oblique surface that has been applied. The hat brim entity is an ellipse platform composed of four elliptic curves. The inner contour surface, outer contour surface, bottom surface and top surface of the hat brim are all curved surfaces. Two elliptic curves and their relative positions are c...

technical field

[0001] The invention relates to the technical field of railway tunnel construction, in particular to a construction method for a large-section railway tunnel with an elliptical tabletop hat brim obliquely cut type portal. Background technique

[0002] Known, the construction method of oblique-cut type portal of elliptical table top hat brim in railway large-section tunnel comprises three steps, namely open hole construction, oblique section construction and hat brim construction, and wherein hat brim construction is the emphasis and difficulty of this type portal construction. At present, most of the brim construction adopts the simple separate formwork technology. In the actual construction, there are the following problems. Mechanized construction is not possible, the efficiency is low, and the progress is slow; repeated measurement of lofting, formwork and reinforcement is required, and the formwork reinforcement takes a long time and consumes a lot of labo...

Examples

Embodiment Construction

[0015] A method for constructing a large-section railway tunnel with an elliptical platform hat brim obliquely cut type portal, comprising open hole construction, oblique section construction and hat brim construction, the hat brim construction comprising the following steps: (1) making the inner hat brim according to the size and shape of the tunnel section The templates of the contour surface, the outer contour surface and the top surface, that is, the inner mold, the outer mold and the end mold, as shown in Figure 1, the inner mold is composed of elliptical contour lines a and c, and the outer mold is composed of elliptical contour lines b and d. The bottom surface of the hat brim is the oblique surface that has been applied. The hat brim entity is an ellipse platform composed of four elliptic curves. The inner contour surface, outer contour surface, bottom surface and top surface of the hat brim are all curved surfaces. Two elliptic curves and their relative positions are c...

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