Stabilizing structure of connecting joint of first steel truss girder section and girder erection support and construction method

Abstract

The invention provides a stabilizing structure and a construction method for connecting joints of a first steel truss girder section and a girder erection support, each connecting joint is symmetrically provided with two rigid frames composed of channel steel, and the rigid frames are connected to the outer sides of a lower chord of the first steel truss girder section, a supporting cushion block and a girder of the girder erection support in a bridging mode. And the three are locked into a whole through a bolt. According to the invention, the stability of the nodes is effectively improved; the channel steel is connected through bolts, the device is convenient to assemble and disassemble, steel is saved, and recycling can be achieved; the phenomenon of dislocation of the lower part of the steel truss girder during rotation and hoisting operation of a girder erection crane at the upper part of the steel truss girder can be effectively prevented, and the stability of a connection node of the girder erection temporary bracket and the steel truss girder is improved; the device is simple in material and light in self weight, and has no obvious influence on the steel truss girder assembly line type; and the method has great popularization value, and provides reference significance for the project of splicing the large-span steel truss girder by adopting the girder erection crane.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, and in particular relates to a stable structure and construction method for the connection node between the first steel truss girder segment and the girder erection support. Background Technology

[0002] Steel trusses, due to their lightweight and high strength, are widely used in long-span bridges. The girder erection crane method, with its high precision and speed, has become the preferred construction method for long-span steel truss bridges. The assembly of steel trusses often relies on girder erection supports and cranes. First, the first steel truss segment is hoisted onto the support frame with pre-placed pads, and then the girder erection crane is hoisted onto that segment. The crane then performs a series of repetitive tasks on the first segment, including lateral girder removal, forward girder erection, and forward movement, sequentially lifting and installing the remaining segments until the entire bridge is closed. When the crane operates on the first segment, it not only bears pressure but also experiences torsion due to the crane's rotation, both on itself and at the connection points with the support frame below, potentially leading to structural instability and misalignment. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides the following technical solution: The stable structure of the connection node between the first steel truss girder segment and the girder support is provided. Each connection node is symmetrically equipped with two sets of rigid frames made of channel steel. The rigid frames span the outer side of the lower chord of the first steel truss girder segment, the support pad, and the main beam of the girder support. The three are locked into a whole by bolts.

[0004] Furthermore, the first steel truss girder segment is fixedly supported by the girder crane.

[0005] Furthermore, the frame structure includes an upper horizontal bar, two vertical bars, and a lower horizontal bar; the upper horizontal bar presses against the upper surface of the lower chord, the upper ends of the two vertical bars are respectively connected to the two ends of the upper horizontal bar, the lower horizontal bar presses against the lower surface of the main beam of the beam support, and the two ends of the lower horizontal bar are respectively connected to the vertical bars on the corresponding sides by bolts.

[0006] Furthermore, a connecting plate extending horizontally toward another vertical bar is welded and fixed to the lower part of each vertical bar, and the lower horizontal bar is connected to the connecting plate by bolts.

[0007] Furthermore, the upper horizontal bar and vertical bar are made of 40# channel steel.

[0008] Furthermore, the lower crossbar is made of 20# channel steel.

[0009] Furthermore, the frame structure adopts a symmetrical split design, which is divided into two independent sub-frames, left and right, along the longitudinal centerline of the steel truss beam. The sub-frames are connected by butt flange plates and bolts.

[0010] Furthermore, rubber pads are also sandwiched between the main beam of the beam-erecting support and the connecting plate.

[0011] The present invention also provides a construction method for a stable structure of the connection node between the first steel truss girder segment and the girder support, comprising the following steps: S1. Hoisting the first steel truss girder segment onto the girder support; S2. Pre-installing the upper horizontal member of the frame structure onto the lower chord, with the two vertical members spanning and extending downwards across the two sides of the lower chord, and the connecting plates respectively abutting against the lower surface of the main beam supporting the girder support; S3. Adjusting the position of the lower horizontal member and tightening the connecting bolts at both ends to the connecting plates; S4. Tightening the connecting bolts between the upper horizontal member and the vertical members.

[0012] Furthermore, in S2, rubber pads are placed on the lower surface of the connecting plate and the main beam of the beam support.

[0013] This invention uses channel steel to form a frame structure, fixing the lower chord of the steel truss below the support point of the girder erecting crane, the support pads, and the main beam of the girder erecting support, effectively improving the stability of such nodes. The channel steel is connected by bolts, making the device easy to install and dismantle, saving steel, and allowing for recycling. It effectively prevents the lower part of the steel truss from shifting during the girder erecting crane's rotation on top of the steel truss and during hoisting operations, improving the stability of the connection node between the temporary girder erecting support and the steel truss. The device uses simple materials, is lightweight, and does not significantly affect the assembly alignment of the steel truss. It has significant promotional value and provides a valuable reference for projects using girder erecting cranes to assemble large-span steel trusses. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a front view schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 A partial side view diagram along the AA direction. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0017] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the purpose of facilitating the description of the present invention or simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] In this invention, "a plurality of" refers to two or more (including two). The terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0019] Unless otherwise explicitly stated and limited, the terms “set up,” “install,” and “connect” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a direct connection or an indirect connection through an intermediate medium.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] As shown in the figure, the stable structure of the present invention is provided with two sets of rigid frames 1 made of channel steel symmetrically at each connection node. The rigid frames 1 are connected to the outside of the lower chord 2, the support pad 3 and the main beam 4 of the beam support of the first steel truss segment. The three are locked into a whole by bolts 10 for detachable connection.

[0022] Furthermore, the first steel truss girder segment is fixedly supported by a girder erecting crane (not shown in the figure).

[0023] Furthermore, the frame structure 1 includes an upper horizontal bar 1a, two vertical bars 1b, and a lower horizontal bar 1c; the upper horizontal bar 1a presses against the upper surface of the lower chord 2, the upper ends of the two vertical bars 1b are respectively connected to the two ends of the upper horizontal bar 1a by bolts 10, the lower horizontal bar 1c presses against the lower surface of the main beam 4 of the beam support, and the two ends of the lower horizontal bar 1c are respectively detachably connected to the corresponding vertical bars 1b by bolts.

[0024] Furthermore, a connecting plate 1d extending horizontally toward another vertical rod is welded and fixed to the lower part of each vertical rod 1b, and the lower horizontal rod 1c is detachably connected to the connecting plate 1d by bolts 10.

[0025] Furthermore, the upper horizontal bar 1a and the vertical bar 1b are made of 40# channel steel.

[0026] Furthermore, the lower crossbar 1c is made of 20# channel steel.

[0027] Furthermore, the frame structure 1 can also adopt a symmetrical split design, divided into two independent sub-frames (not shown in the figure) along the longitudinal centerline of the steel truss beam, and the sub-frames are connected by butt flange plates and bolts.

[0028] Furthermore, the lower surface of the lower chord 2 is fixedly connected to the support pad 3 by bolts, and the support pad 3 abuts against the main beam 4 of the beam support.

[0029] Furthermore, a rubber pad 6 is also provided between the main beam 4 and the lower crossbar 1c of the beam support.

[0030] Furthermore, the rubber pad 6 is sandwiched between the connecting plate 1d and the main beam 4 of the beam support.

[0031] The construction method of the stabilized structure includes the following steps: S1. Hoisting the first steel truss segment onto the beam support 4; S2. Pre-installing the upper horizontal bar 1a of the frame structure 1 onto the lower chord 2, with the vertical bars on both sides spanning and extending downwards to both sides of the lower chord 2, and the connecting plates 1d respectively abutting against the lower surface of the main beam 4 of the beam support; S3. Adjusting the position of the lower horizontal bar 1c and locking the connecting bolts at both ends to the connecting plate 1d; S4. Locking the connecting bolts between the upper horizontal bar 1a and the vertical bar 1b.

[0032] Furthermore, in S2, rubber pads 6 are placed on the lower surface of the connecting plate 1d and the main beam 4 of the beam support.

[0033] Setting up a temporary stabilizing structure between the steel truss and the girder support below the girder crane's support point can effectively reduce the phenomenon of the steel truss shifting due to the rotation and lifting of the girder crane. The dimensions of each component can be adjusted according to the actual situation of each project.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stable structure of a first steel truss beam segment and a beam erecting support connecting node, characterized in that, Each connecting node is symmetrically equipped with two groups of rigid frames composed of channel steel, which are connected to the outside of the lower chord of the first steel truss segment, the supporting cushion and the beam erection support main beam as a whole by bolts.

2. The stabilizing structure of the first steel truss girder segment and the erector support connection node of claim 1, wherein, The first steel truss segment is fixedly supported by the beam erection support crane.

3. The stabilizing structure for the first steel truss girder segment and the erector support connection node of claim 1, wherein, The frame structure comprises an upper cross bar, two vertical bars and a lower cross bar; the upper cross bar is pressed against the upper surface of the lower chord, the upper ends of the two vertical bars are respectively connected to the two ends of the upper cross bar, the lower cross bar is pressed against the lower surface of the beam erection support main beam, and the two ends of the lower cross bar are respectively connected to the vertical bars on the corresponding side by bolts.

4. The stabilizing structure for the first steel truss girder segment and the erector support connection node of claim 1, wherein, A connecting plate horizontally extending towards the other vertical bar is welded to the lower part of each vertical bar, and the lower cross bar and the connecting plate are connected by bolts.

5. The stabilizing structure for the first steel truss girder segment and the erector scaffold connection node of claim 1, wherein, The upper cross bar and the vertical bars are made of 40# channel steel.

6. The stabilizing structure for the first steel truss girder segment and the erector scaffold connection node of claim 1, wherein, The lower cross bar is made of 20# channel steel.

7. The stabilizing structure for the first steel truss girder segment and the erector scaffold connection node of claim 1, wherein, The frame structure is designed in a symmetric split type, and is divided into left and right independent sub-frames along the longitudinal center line of the steel truss, and the sub-frames are connected by butt flanges and bolts.

8. The stabilizing structure for the first steel truss girder segment and the erector scaffold connection node of claim 1, wherein, Rubber pads are further arranged between the beam erection support main beam and the connecting plate.

9. A method of construction of a stabilising structure for a first steel truss segment to scaffold connection joint, comprising the steps of: S1. Hoisting the first steel truss segment to the beam erection support; S2. Preassembling the upper cross bar of the frame structure on the lower chord, the vertical bars on both sides are across and extend downwards on both sides of the lower chord, and the connecting plates are respectively abutted against the lower surface of the beam erection support main beam; S3. Adjusting the position of the lower cross bar and locking the connecting bolts of the two ends of the lower cross bar and the connecting plate; S4. Locking the connecting bolts of the upper cross bar and the vertical bars.

10. The method of construction of a stabilizing structure for a first steel truss girder segment and a girder erection support connection node of claim 9, wherein, In S2, rubber pads are arranged between the connecting plate and the lower surface of the beam erection support main beam. In S2, rubber pads are arranged between the connecting plate and the lower surface of the beam erection support main beam.

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