Nose beam and construction method for assisting erection of steel beams

Abstract

The application provides a nose beam for assisting erection of a steel beam, which comprises vertical ribs, a main longitudinal beam and a diagonal brace, one end of the main longitudinal beam is a connecting end, the other end is a temporary supporting end, the connecting end is fixedly connected to one side of the bottom end of the vertical rib, the high end of the diagonal brace is installed on the top of the vertical rib, and the low end of the diagonal brace is installed on the main longitudinal beam; and the vertical rib is provided with a connecting structure for connecting with the side surface of the steel beam on the side surface close to the installation side of the main longitudinal beam. In the application, the steel beam is erected by a beam erecting crane in full cantilever mode, the incremental launching method is not used, the temporary pier is not needed, the materials and equipment are saved, the construction period is relatively short, and the fast construction requirement is met.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bridge construction, and particularly relates to a nose beam for assisting steel beam erection and a construction method. BACKGROUND

[0002] With the rapid development of society, the construction of domestic infrastructure is also in full swing, and the railway and highway bridges in China are gradually developing towards larger span and faster construction speed, which has put forward higher requirements for design and construction. In the construction of high-pier, large-span and super-long bridges, the construction of high-altitude steel beams is difficult, and the usual method is to set up temporary piers and adopt the incremental launching method or only use a beam hoist to erect the steel beam in full cantilever.

[0003] In the past construction of high-altitude steel beams, the incremental launching method has the disadvantages of large material and equipment consumption, long construction period and the need to wait for the completion of temporary pier construction; and the method of erecting the steel beam in full cantilever only has the disadvantage that it is limited by the stress of the steel beam and is only suitable for medium-span bridges, and the stress of the steel beam in the construction process may be greater than the stress in the running state of the bridge or even the stress in the limit state, which requires changes to the original design structure of the steel beam. SUMMARY

[0004] Therefore, the present application aims to provide a nose beam for assisting steel beam erection and a construction method to achieve the erection of the steel beam in full cantilever without the need to set up temporary piers at the pier position, thereby reducing the construction cost.

[0005] To achieve the above-mentioned purpose, the technical scheme of the nose beam for assisting steel beam erection will be described first.

[0006] The nose beam for assisting steel beam erection comprises vertical ribs, a main longitudinal beam and diagonal braces, one end of the main longitudinal beam is a connecting end, and the other end is a temporary support end, the connecting end is fixed to the bottom end of one side of the vertical rib, the high end of the diagonal brace is installed at the top of the vertical rib, and the low end of the diagonal brace is installed on the main longitudinal beam.

[0007] The vertical rib is provided with a connecting structure for connecting with the side surface of the steel beam on the side surface close to the installation side of the main longitudinal beam.

[0008] Further, the connecting structure comprises a T-shaped beam, the web of the T-shaped beam is fixed to the vertical rib, and the flange of the T-shaped beam is provided with a fixing hole.

[0009] Further, the vertical rib, the main longitudinal beam and the diagonal brace are all box-shaped structures and are welded to each other.

[0010] Further, the bottom surface of the temporary support end is concave and has a limiting groove.

[0011] Further, the low end of the diagonal brace is installed at the middle position of the main longitudinal beam.

[0012] The above is a description of the technical solution of the nose beam for assisting steel beam erection. Since the present application also includes a steel beam erection construction method using the nose beam, the construction method is described below:

[0013] A steel beam erection construction method, comprising the following steps:

[0014] S10: Transporting a segment of steel beam in front of a pier top to the rear of a beam erection crane, and installing a nose beam at the left and right positions of the front end of the segment of steel beam in front of the pier top, with the two nose beams being symmetrical;

[0015] S20: Cantilever erecting the segment of steel beam in front of the pier top provided with the nose beams to a designed position by using the beam erection crane, and connecting and fixing the segment of steel beam in front of the pier top and the previously completed segment of steel beam, at this time, the temporary support ends of the main longitudinal beams of the two nose beams are lapped and supported on the pier, and the segment of steel beam in front of the pier top is temporarily and stably supported;

[0016] S30: Erecting a next segment of steel beam by the beam erection crane, and connecting and fixing the next segment of steel beam and the segment of steel beam in front of the pier top temporarily supported on the pier in step S20 on the pier top, to realize the erection of the steel beam on the pier;

[0017] S40: Removing the nose beams.

[0018] Further, in step S20, a temporary support point corresponding to the nose beam is arranged on the pier top, and the temporary support end of the main longitudinal beam is supported on the temporary support point.

[0019] Further, the temporary support point is a jack.

[0020] Compared with the prior art, the nose beam for assisting steel beam erection and the construction method have the following advantages:

[0021] (1) In the present application, the beam erection crane is used to cantilever erect the steel beam, and the incremental launching method is not used, so that the temporary pier is not needed, materials and equipment are saved, and the construction period is relatively short, which meets the requirement of rapid construction.

[0022] (2) The present application fully utilizes the superiority of the cantilever construction method, and expands the generality of the cantilever construction method to bridges with larger spans, so that the problem that the stress of the steel beam in the construction process may be greater than the stress in the running state of the bridge or even the stress in the limit state, and the original design structure of the steel beam needs to be changed, is solved.

[0023] (3) The nose beam structure in the present application is reasonably designed, the structural components are common, the on-site operation process is conventional, the construction is simple and convenient, and the nose beam can be removed and reused. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the disclosure, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in the explanation of the application. In the drawings, which are not necessarily to scale, :

[0025] Figure 1 A front view of a nose beam for assisting erection of a steel beam according to an embodiment of the present application;

[0026] Figure 2 A left view of a nose beam for assisting erection of a steel beam according to an embodiment of the present application;

[0027] Figure 3 A flow chart of a steel beam erection process;

[0028] Figure 4 A longitudinal bridge direction steel beam erection construction drawing;

[0029] Figure 5 A nose beam and steel beam installation structural drawing;

[0030] BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 1 - a previous segment steel beam on a pier top; 2 - a main longitudinal beam; 21 - a limiting groove; 3 - a vertical rib; 4 - a connecting structure; 5 - an inclined brace; 6 - a temporary support point; 7 - a beam erection crane; 8 - a next segment steel beam; 9 - a steel beam lifting pad; 10 - a pier. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0034] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The nose beam for assisting steel beam erection and the steel beam erection construction method of the present application will be described below with reference to the accompanying drawings and in conjunction with the embodiments.

[0036] Embodiment one: a nose beam for assisting steel beam erection, comprising vertical ribs 3, main longitudinal beams 2 and inclined braces 5, the vertical ribs 3, the main longitudinal beams 2 and the inclined braces 5 are all box structures, that is, box steel beam structures, the main longitudinal beams 2 are horizontally arranged, one end of the main longitudinal beams 2 is a connecting end, and the other end is a temporary support end. The connecting end of the main longitudinal beam 2 is welded to the bottom end of one side of the vertical rib 3, at this time the main longitudinal beam 2 and the vertical rib 3 form an L-shaped support structure, the high end of the inclined brace 5 is welded to the top of the vertical rib 3, and the low end of the inclined brace 5 is welded to the main longitudinal beam 2, preferably at the middle position of the main longitudinal beam 2. The vertical rib 3 is provided with a connecting structure 4 for fixing with the side of the steel beam on one side close to the connecting side of the main longitudinal beam, the connecting structure 4 is preferably a T-shaped beam, the flange of the T-shaped beam is opposite to the vertical rib 3, the T-shaped beam is welded to the vertical rib 3 through the web, and the flange of the T-shaped beam is provided with a fixing hole for connecting and fixing with the steel beam, the fixing hole is horizontal and perpendicular to the main longitudinal beam 2, during installation, the nose beam is fixed to the side of the steel beam by using bolts passing through the fixing hole.

[0037] The nose beam adopts the structure, which improves the support strength, the low end of the inclined brace 5 is installed at the middle position of the main longitudinal beam 2, which improves the bending strength of the main longitudinal beam 2, when the nose beam overlaps the top of the pier for temporarily supporting the steel beam, the self weight of the steel beam will cause the temporary support end of the main longitudinal beam (the temporary support is formed by the overlapping of the top of the pier) to have an upward bending trend, the inclined brace 5 forms a support on the inner side of the main longitudinal beam 2, which effectively prevents the temporary support end of the main longitudinal beam from bending upward, and ensures the stability of the temporary support of the nose beam to the steel beam.

[0038] In the present application, the bottom surface of the temporary support end of the main longitudinal beam 2 is concave to form a limiting groove 21.

[0039] The above embodiment one is a description of the nose beam for assisting steel beam erection, and the steel beam erection method using the auxiliary nose beam will be described below through embodiment two.

[0040] Embodiment two: a steel beam erection construction method using the nose beam for assisting steel beam erection, as shown in Figure 3 The method comprises the following steps:

[0041] S10: the pier top before a segment of steel beam 1 to the beam hoist 7 rear, in the pier top before a segment of steel beam 1 front end left and right side position respectively installed a nose beam, two nose beam symmetrical installation, installation after the main longitudinal beam 2 of nose beam horizontal and along the bridge direction setting, main longitudinal beam 2 pier 10 top, as shown in Figure 4 、 5 Shown in;

[0042] S20: in the pier 10 top set and nose beam corresponding temporary fulcrum 6, temporary fulcrum 6 preferably jack or cushion, using beam hoist 7 will be installed with nose beam the pier top before a segment of steel beam cantilever erection to the design position, the pier top before a segment of steel beam and previously completed steel beam section connection fixed, at this time two nose beam main longitudinal beam 2 temporary support end all overlap, support on temporary fulcrum 6, temporary stable support pier top before a segment of steel beam 1;

[0043] S30: in the pier top set steel beam copy cushion 9, beam hoist erection next segment of steel beam 8, pier top copy cushion steel beam, realize steel beam on pier, the next segment of steel beam 8 and step S20 in the temporary support on the pier pier top before a segment of steel beam 1 connection fixed, complete this span erection;

[0044] S40: remove nose beam and temporary fulcrum 6.

[0045] The above only for the preferred embodiment of the present application has, and not to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A steel girder erection method characterized by: The method comprises the following steps: S10: a nose beam is installed on the left and right sides of the front end of the pier top segment steel beam (1) after the pier top segment steel beam (1) is transported to the rear of the beam erection crane (7), and the two nose beams are symmetrical; The nose beam comprises vertical ribs (3), main longitudinal beams (2) and inclined braces (5), one end of the main longitudinal beam (2) is a connecting end, and the other end is a temporary support end, the connecting end is fixedly connected to the bottom end of one side of the vertical rib (3), the high end of the inclined brace (5) is installed on the top of the vertical rib (3), and the low end of the inclined brace (5) is installed on the main longitudinal beam (2); The vertical rib (3) is provided with a connecting structure (4) for connecting the side surface of the steel beam on the side surface close to the installation side of the main longitudinal beam; S20: the pier top segment steel beam (1) provided with the nose beam is cantilevered to the designed position by the beam erection crane (7), and the pier top segment steel beam (1) and the previously constructed steel beam segment are connected and fixed, at this time, the temporary support ends of the main longitudinal beams (2) of the two nose beams are overlapped and supported on the pier (10), and the pier top segment steel beam (1) is temporarily and stably supported; S30: the beam erection crane (7) erects the next segment steel beam (8) on the pier top cushion, connects and fixes the next segment steel beam (8) and the pier top segment steel beam (1) temporarily supported on the pier in step S20, and realizes the steel beam on the pier; S40: the nose beam is removed.

2. The steel girder erection method according to claim 1, characterized by: In step S20, a temporary fulcrum (6) corresponding to the nose beam is arranged on the top of the pier (10), and the temporary support end of the main longitudinal beam (2) is supported on the temporary fulcrum (6).

3. The steel girder erection method according to claim 2, characterized by: The temporary fulcrum (6) is a jack.

4. The steel girder erection method according to claim 1, characterized by: The connecting structure (4) comprises a T-shaped beam, the web of the T-shaped beam is fixed to the vertical rib (3), and the flange of the T-shaped beam is provided with a fixing hole.

5. The steel girder erection method according to claim 1, characterized by: The vertical rib (3), the main longitudinal beam (2) and the inclined brace (5) are all box-shaped structures and are welded with each other.

6. The steel girder erection method according to claim 1, characterized by: The bottom surface of the temporary support end is concave and limited by a limiting groove (21).

7. The steel girder erection method according to claim 1, characterized by: The low end of the inclined brace (5) is installed at the middle position of the main longitudinal beam (2).

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