Construction method for erecting steel beam with the aid of the outrigger of a beam erection crane

Abstract

The application provides a construction method for erecting a steel beam with the assistance of a support leg of a beam-erecting crane, comprising the following steps: S10: a front support leg of the crane is arranged at the front end of the cantilever of the beam-erecting crane; S20: a previous segment of the steel beam is erected by using the beam-erecting crane; S30: the beam-erecting crane is moved to the previous segment of the steel beam, the bottom end of the front support leg of the crane is extended and supported on the top of the pier to form a temporary fulcrum; S40: the beam-erecting crane erects an upper pier segment of the steel beam, the upper pier segment of the steel beam is lifted by a lifting cushion, and is connected and fixed with the previous segment of the steel beam in step S20 to realize the upper pier of the steel beam. In the application, the beam-erecting crane is used to erect the steel beam 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, the time for removing the temporary pier is not needed, and the application meets the requirement of rapid construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bridge construction, and particularly relates to a construction method for erecting a steel beam with the assistance of a support leg of a beam-erecting crane. BACKGROUND

[0002] With the rapid development of social economy, the construction of domestic infrastructure livelihood projects is also vigorously carried out, and the development direction of highways and railway bridges in China is to be higher in large span and faster in construction speed, which puts forward higher requirements on design, construction, equipment, etc. In the construction of high-pier, large-span and super-long bridges, the construction of high-altitude steel beams is difficult, and the previous method is to set up temporary piers and adopt the incremental launching method for construction or only use a beam-erecting crane to erect a steel beam in full cantilever.

[0003] In the previous construction of high-altitude steel beams, the incremental launching method has the problems of large amount of temporary engineering materials, complex and large amount of equipment, and the need to wait for the completion of temporary engineering construction, long demolition time and long construction period; and the method of erecting a steel beam in full cantilever with only a beam-erecting crane has the problem of being limited by the stress of the steel beam, and is only suitable for medium-span bridges. In the construction process of large-span steel beams, the stress of the steel beam may be greater than the stress in the running state of the bridge or even the stress in the limit state, which results in the need to change the original design structure of the steel beam. SUMMARY

[0004] Therefore, the present application aims to provide a construction method for erecting a steel beam with the assistance of a support leg of a beam-erecting crane to overcome the above technical defects.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A construction method for erecting a steel beam with the assistance of a support leg of a beam-erecting crane, comprising the following steps:

[0007] S10: A crane front support leg is arranged at the front end of the cantilever of the beam-erecting crane;

[0008] S20: A previous segment steel beam corresponding to the top of the pier is transported to the rear of the beam-erecting crane, the beam-erecting crane erects the previous segment steel beam to a designed position, and the previous segment steel beam and the previously completed steel beam segment are connected and fixed at the designed position;

[0009] S30: The beam-erecting crane is moved to the previous segment steel beam, and the bottom end of the crane front support leg is extended to support the top of the pier to form a temporary fulcrum;

[0010] S40: The beam-erecting crane erects an upper pier segment steel beam, a cushion is arranged at one end of the upper pier segment steel beam near the previous segment steel beam to make the upper pier segment steel beam pier, the upper pier segment steel beam and the previous segment steel beam in step S20 are connected and fixed, and the steel beam is pored.

[0011] Further, the crane front leg is a hydraulic leg.

[0012] Further, the bottom end of the piston rod of the crane front leg is provided with a pier top auxiliary device.

[0013] Compared with the prior art, the construction method for assisting steel beam erection by using the beam erection crane leg has the following advantages:

[0014] (1) In the present application, the full-cantilever beam erection crane is used for erecting the steel beam, and the incremental launching method is not used, so that the temporary pier is not needed, the materials and equipment are saved, the construction period is relatively short, and the demolition time is not considered, which meets the requirements of rapid construction.

[0015] (2) The full-cantilever construction method is fully utilized, and its generality is expanded to larger-span bridges, 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 steel beam design structure needs to be changed, is solved.

[0016] (3) The structure is reasonably designed, other temporary structures are not needed, only the beam erection crane needs to be optimized, the construction process can be used multiple times, the investment is small, and the construction is simple. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present application, are used to provide a further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0018] Figure 1 The construction method flowchart is described in the embodiments of the present application;

[0019] Figure 2 The working operation schematic diagram of the construction method for assisting steel beam erection by using the beam erection crane leg is described in the embodiments of the present application;

[0020] Explanation of reference signs:

[0021] 1-previous segment steel beam; 2-pier top auxiliary device; 4-pier; 5-beam erection crane; 6-upper pier segment steel beam; 7-crane front leg. DETAILED DESCRIPTION

[0022] 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.

[0023] In the description of the present application, it needs to 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 shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0024] In the description of the present application, it needs to be understood 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; it can be the communication 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.

[0025] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] A construction method for erecting steel beams with the aid of a bridge girder crane outrigger, the operation flow is as shown in Figure 1 The method comprises the following steps:

[0027] S10: setting a crane front outrigger 7 at the front end of the cantilever of the bridge girder crane 5;

[0028] The crane front outrigger 7 is a hydraulic outrigger structure, which can be one hydraulic outrigger or assembled by two or more hydraulic outriggers. For example, when the hydraulic outrigger structure is composed of two hydraulic outriggers, the two hydraulic outriggers are distributed on the left and right sides of the cantilever of the bridge girder crane 5, the cylinder parts of the two hydraulic outriggers are connected to the front end of the cantilever of the bridge girder crane 5 through fixing members such as box girder structure, and the connection and fixation of the crane front outrigger 7 and the cantilever of the bridge girder crane 5 are completed; the piston rods of the two hydraulic outriggers are vertically downward, and a pier top auxiliary facility 2 is connected to the bottom ends of the piston rods of the two hydraulic outriggers, which can be a plate structure, used to increase the contact area between the crane front outrigger and the top surface of the pier 4, and improve the support stability of the crane front outrigger 7;

[0029] S20: the previous segment steel beam 1 corresponding to the top of the pier 4 is transported to the rear of the beam erecting crane 5, the beam erecting crane 5 hoists the previous segment steel beam 1 to the designed erection position, and the previous segment steel beam 1 and the previously constructed steel beam segment are connected and fixed at the designed position;

[0030] S30: the beam erecting crane 5 is moved to the connected and fixed previous segment steel beam 1, the piston rod of the front support leg 7 of the crane is extended, the pier top auxiliary device 2 of the front support leg 7 of the crane is in close contact with the top end of the pier 4 and is tightly pressed according to the designed pre-topping force, and a temporary supporting point is formed, as shown in Figure 2

[0031] S40: the beam erecting crane 5 hoists the upper pier segment steel beam 6 to the designed position for erection:

[0032] The upper pier segment steel beam 6 is the upper pier beam segment of the pier 4; the upper pier segment steel beam 6 is hoisted by the beam erecting crane 5 and is made to be on the pier, the upper pier segment steel beam 6 and the previous segment steel beam 1 in the step S20 are connected and fixed, and the steel beam on the pier is realized.

[0033] After the steel beam on the pier, the crane front support leg 7 is retracted, the beam erecting crane 5 is moved forward, and the pier top segment beam is continuously erected.

[0034] The present application has reasonable design and simple construction, and the full-cantilever erected steel beam does not need temporary piers and has low unit length cost.

[0035] The above only describes the preferred embodiment of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.​

Claims

1. A construction method for erecting a steel beam with the assistance of a bridge girder erector's support leg, characterized in that: The method comprises the following steps: S10: setting a crane front leg (7) at the front end of the cantilever of the girder erection crane (5); S20: transporting a front segmental steel girder (1) corresponding to the top of the pier (4) to the rear of the girder erection crane (5), and erecting the front segmental steel girder (1) to a designed position by the girder erection crane (5), and connecting and fixing the front segmental steel girder (1) and the previously constructed segmental steel girder; S30: moving the girder erection crane (5) to the front segmental steel girder (1), and extending the bottom end of the crane front leg (7) to support the top of the pier (4) to form a temporary fulcrum; S40: erecting an upper pier segmental steel girder (6) by the girder erection crane (5), and supporting the upper pier segmental steel girder (6) on the pier (4) by abutting pads near one end of the front segmental steel girder (1) at the top of the pier (4), connecting and fixing the upper pier segmental steel girder (6) and the front segmental steel girder (1) in step S20, and realizing the upper pier of the steel girder.

2. The construction method of claim 1, wherein the method further comprises: The crane front leg (7) is a hydraulic leg.

3. The construction method of claim 2, wherein: The bottom end of the piston rod of the crane front leg (7) is provided with a pier top auxiliary device (2).

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