Prefabricated steel tube truss beam and old concrete beam node structure and construction method

Abstract

The present invention relates to an assembled node structure of additional steel tube trusses and old concrete beams and a construction method, comprising an old concrete beam, a node steel frame, an upper steel plate and an additional steel tube truss, wherein the old concrete beam passes through the node steel frame, and the side of the node steel frame is fixedly connected to the additional steel tube truss arranged longitudinally; the upper steel plate is arranged on the top surface of the old concrete beam and is fixedly connected to the upper end of the node steel frame. The node structure enables the additional steel tube truss and the old concrete beam to form a whole and bear force together, thereby improving the overall rigidity of the bridge system, making the force distribution of the hanger more uniform, and improving driving comfort; the node steel frame, the upper steel plate and the additional steel tube truss are all prefabricated in the factory, hoisted on site, and connected by bolts to form an assembled node structure, so that the construction realizes assembled flow operation, simplifies the construction process, shortens the construction period, eliminates the influence of adverse factors on site, and ensures the construction quality.

Description

Technical field:

[0002] The invention relates to an assembled node structure of additional steel tube truss beams and old concrete beams and a construction method. Background technology:

[0004] The existing mid-and-bottom arch bridges mostly use a floating system, that is, the upper end of the hanger is fixed to the arch rib structure, the lower end holds the concrete beam, and the bridge deck is simply supported or fixedly constrained and laid on the top of the concrete beam. For safety reasons, the hanger structure needs to be replaced after a certain period of use; at the same time, the overall performance of the bridge system of this type of bridge structure is poor due to the lack of longitudinal connection between the concrete beams. Steel tube trusses have the advantages of light weight and high structural rigidity. For a large number of existing arch bridges of this type, adding steel tube longitudinal trusses to connect the old concrete beams to improve the integrity of the bridge system is an effective way to enhance structural safety and comfort and ensure the durability of the bridge. However, the structural reliability of the connection nodes between the longitudinal and transverse beams is a key issue. This case was born out of this. Summary of the invention:

[0006] The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide an assembled node structure of additional steel tube trusses and old concrete beams and a construction method.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an assembled node structure of additional steel tube trusses and old concrete beams, including old concrete beams, a node steel frame, an upper steel plate and additional steel tube trusses, the old concrete beams penetrate the node steel frame, and the side surfaces of the node steel frame are fixedly connected to the longitudinally arranged additional steel tube trusses; the upper steel plate is arranged on the top surface of the old concrete beam and is fixedly connected to the upper end of the node steel frame.

[0008] Furthermore, the node steel skeleton includes two side steel plates arranged in parallel on the left and right sides of the old concrete beam, the upper ends of the two side steel plates are respectively fixedly connected with longitudinally arranged upper chord connecting steel pipes, and the lower ends of the two side steel pipes are fixedly penetrated with a longitudinally arranged lower chord connecting steel pipe, and the upper chord connecting steel pipe and the lower chord connecting steel pipe are respectively fixedly connected with the added steel pipe truss.

[0009] Furthermore, the upper chord connecting steel pipe and the lower chord connecting steel pipe are fixedly connected with a first connecting end plate at one end away from the old concrete beam, and the added cross tube truss is fixedly connected with a second connecting end plate at one end close to the side steel plate, and the first connecting end plate and the second connecting end plate are fixed by a plurality of first bolts.

[0010] Furthermore, the upper steel plate is U-shaped, and both side edges of the upper steel plate are connected and fixed to the upper ends of the side steel plates via a plurality of transversely distributed second bolts.

[0011] Furthermore, a lower steel plate is fixedly connected between the lower ends of the two side steel plates.

[0012] Furthermore, a plurality of evenly distributed annular stiffening steel plates are fixedly connected between the outer peripheral wall of the upper chord connecting steel pipe and the side steel plates, and between the outer peripheral walls at both ends of the lower chord connecting steel pipe and the side steel plates.

[0013] Furthermore, a plurality of sidewalk slab beam annular stirrups are pre-welded in the transverse direction at the top end of the upper steel plate, and the sidewalk slab beam annular stirrups are arranged vertically.

[0014] Furthermore, epoxy mortar is injected under high pressure to fill the gap between the node steel skeleton and the old concrete beam.

[0015] Furthermore, the upper steel plate is provided with a connecting circular hole for connecting with the suspension rod conduit.

[0016] Another technical solution adopted by the present invention is: a construction method for adding a steel tube truss beam and an old concrete beam node structure in an assembled manner, comprising the following steps:

[0017] (1) Remove the sidewalk slab on the old concrete beam, temporarily dismantle the hanger and set up a temporary bracket, measure the actual distance between the old concrete beams, and prefabricate the steel tube truss and node steel skeleton in the factory;

[0018] (2) The node steel frame is hoisted upward from the bottom of the old concrete beam to the designed position, and the upper steel plate is connected to the side steel plate of the node steel frame by the second bolt;

[0019] (3) The gap between the node steel skeleton and the old concrete beam is filled with epoxy mortar injected under high pressure;

[0020] (4) hoisting and installing the additional steel tube truss beam, and connecting the second connecting end plate at the end of the additional steel tube truss beam to the first connecting end plate on the node steel skeleton through the first bolt;

[0021] (5) Reinstall the hangers and concrete sidewalk slabs into place to complete the connection node construction.

[0022] Compared with the prior art, the present invention has the following effects:

[0023] (1) This node structure enables the added steel tube truss girder and the old concrete cross beam to bear the force together as a whole, thus improving the overall stiffness of the bridge system, making the force distribution of the hanger more uniform and improving driving comfort;

[0024] (2) The longitudinally penetrating lower chord connecting pipe effectively connects the old concrete beams to participate in the joint load, while improving the structural strength and preventing the accidental breakage of a single hanger rod and the bridge deck structure falling under the bridge;

[0025] (3) The node steel skeleton, upper steel plate and additional steel tube trusses are all prefabricated in the factory, hoisted on site, and connected by bolts to form an assembled node structure. The construction realizes assembled flow operation, simplifies the construction process, shortens the construction period, eliminates the influence of adverse factors on site, and ensures the construction quality. Description of the drawings:

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure when the node steel skeleton is hoisted in place in an embodiment of the present invention;

[0029] Figure 3 yes Figure 2 Schematic diagram of the structure where the middle and upper steel plates are connected to the node steel skeleton;

[0030] Figure 4 yes Figure 3 Schematic diagram of the structure of the sidewalk slab beam after the hoop reinforcement is welded to the middle and upper steel plates;

[0031] Figure 5 yes Figure 4 Schematic diagram of the structure after adding steel tube trusses and connecting them to the node steel skeleton.

[0032] In the figure:

[0033] 1-upper steel plate; 2-lower steel plate; 3-side steel plate; 4-lower chord connecting steel pipe; 5-first connecting end plate; 6-upper chord connecting steel pipe; 7-second connecting end plate; 8-stiffening steel plate; 9-second bolt; 10-first bolt; 11-additional steel tube truss; 12-old concrete beam; 13-sidewalk slab beam circumferential stirrups; 14-node steel skeleton. Specific implementation method:

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] like Figures 1 to 5As shown, the present invention is an assembled node structure of an additional steel tube truss beam and an old concrete beam, comprising an old concrete beam 12, a node steel skeleton 14, an upper steel plate 1 and an additional steel tube truss beam 11, wherein the old concrete beam 12 passes through the interior of the node steel skeleton 14, and the side surface of the node steel skeleton 14 is fixedly connected to the longitudinally arranged additional steel tube truss beam 11; the upper steel plate 1 is arranged on the top surface of the old concrete beam 12 and is fixedly connected to the upper end of the node steel skeleton 14.

[0038] In this embodiment, the node steel skeleton 14 includes two side steel plates 3 arranged in parallel on the left and right sides of the old concrete beam 12, and the upper ends of the two side steel plates 3 are respectively welded with the upper chord connecting steel pipes 6 arranged longitudinally, and the lower ends of the two side steel pipes 3 are fixedly penetrated with the lower chord connecting steel pipes 4 arranged longitudinally, and the upper chord connecting steel pipes 6 and the lower chord connecting steel pipes 4 are both perpendicular to the side steel plates 3, and the upper chord connecting steel pipes 6 and the lower chord connecting steel pipes 4 are respectively fixedly connected with the additional steel pipe truss 11. Preferably, the upper chord connecting steel pipe 6 is directly welded to the side plate steel plate 3, and the side plate steel plate 3 is prefabricated in the factory to reserve a cavity for the lower chord connecting steel pipe 4 to pass through, and the intersection of the upper chord connecting steel pipe 6 and the side steel plate 3 and the intersection of the lower chord connecting steel pipe 4 and the side steel plate 3 are all circumferentially welded.

[0039] In this embodiment, a square first connecting end plate 5 is welded to the end face of the upper chord connecting steel pipe 6 and the lower chord connecting steel pipe 4 away from the old concrete beam 12, and a square second connecting end plate 7 is welded to the end of the added cross tube truss 11 close to the side steel plate 3. The first connecting end plate 5 and the second connecting end plate 7 are connected and fixed by a plurality of first bolts 10.

[0040] In this embodiment, the upper steel plate 1 is U-shaped, and both side edges of the upper steel plate 1 are connected and fixed to the upper ends of the side steel plates 3 via a plurality of transversely distributed second bolts 9 .

[0041] In this embodiment, in order to improve the structural strength of the node steel skeleton, a horizontally arranged lower steel plate 2 is fixedly connected between the lower ends of the two side steel plates 3 .

[0042] In this embodiment, a number of annularly evenly distributed stiffening steel plates 8 are welded between the outer peripheral wall of the upper chord connecting steel pipe 6 and the side steel plate 3, and between the outer peripheral walls at both ends of the lower chord connecting steel pipe 4 and the side steel plates 3 to improve the structural strength of the lower chord connecting steel pipe and the upper chord connecting steel pipe.

[0043] In this embodiment, a plurality of sidewalk slab beam annular stirrups 13 are pre-welded transversely on the top of the upper steel plate 1, and the sidewalk slab beam annular stirrups are arranged vertically to facilitate the subsequent pouring of the sidewalk slab beams into one body.

[0044] In this embodiment, epoxy mortar is injected at high pressure to fill the gap between the node steel skeleton 14 and the old concrete beam 12 .

[0045] In this embodiment, the upper steel plate 1 is provided with a connecting circular hole for connecting with the suspension rod conduit, and the diameter of the connecting circular hole is slightly larger than the diameter of the suspension rod conduit.

[0046] In this embodiment, the additional steel tube truss 11, the node steel skeleton 14 and the upper steel plate 1 are all prefabricated in the factory.

[0047] In this embodiment, the plane position of the lower chord connecting steel pipe 4 of the node steel skeleton 14 should avoid the anchor socket structure under the hanger.

[0048] In this embodiment, each side steel plate is connected with two upper chord connecting steel pipes, which are distributed in the transverse direction; the lower chord connecting steel pipes are also two and distributed in the transverse direction. It should be noted that the number of upper chord connecting steel pipes and lower chord connecting steel pipes can be set as required; at the same time, in the actual construction process, the number of the entire assembled additional steel pipe truss beam and the old concrete beam node structure is also set as required.

[0049] In this embodiment, the construction method of the assembled steel tube truss beam and the old concrete beam node structure includes the following steps:

[0050] (1) Remove the sidewalk slab on the old concrete beam, temporarily dismantle the hanger and set up temporary brackets and other safety measures, measure the actual distance between the old concrete beams, and prefabricate steel tube trusses and node steel skeletons in the factory;

[0051] (2) The node steel skeleton 14 is hoisted upward from the bottom of the old concrete beam 12 to the designed position, and the upper steel plate 1 is connected to the side steel plate 3 of the node steel skeleton 14 by the second bolt 9;

[0052] (3) The gap between the node steel skeleton 14 and the old concrete beam 12 is filled with epoxy mortar injected under high pressure;

[0053] (4) hoisting and installing the additional steel tube truss beam 11, and connecting the second connecting end plate 7 at the end of the additional steel tube truss beam 11 to the first connecting end plate 5 on the node steel skeleton 14 through the first bolt 10;

[0054] (5) Reinstall the hangers and concrete sidewalk slabs into place to complete the connection node construction.

[0055] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by integrated molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0056] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0057] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An assembled steel tube truss beam and an old concrete beam node structure, characterized in that: It includes an old concrete beam, a node steel frame, an upper steel plate and an additional steel tube truss beam, the old concrete beam passes through the node steel frame, and the side of the node steel frame is fixedly connected to the longitudinally arranged additional steel tube truss beam; the upper steel plate is arranged on the top surface of the old concrete beam and is fixedly connected to the upper end of the node steel frame; the node steel frame includes two side steel plates arranged in parallel on the left and right sides of the old concrete beam, the upper ends of the two side steel plates are respectively fixedly connected with the longitudinally arranged upper chord connecting steel pipes, and the lower ends of the two side steel pipes are fixedly penetrated with the longitudinally arranged lower chord connecting steel pipe, and the upper chord connecting steel pipe and the lower chord connecting steel pipe are respectively fixedly connected with the additional steel tube truss beam; a plurality of sidewalk slab beam annular stirrups are pre-welded along the transverse direction on the top of the upper steel plate, and the sidewalk slab beam annular stirrups are vertically arranged; the upper steel plate is provided with a connecting circular hole for connecting with the hanger guide tube.

2. The assembled node structure of adding steel tube truss beam and old concrete beam according to claim 1 is characterized by: The upper chord connecting steel pipe and the lower chord connecting steel pipe are fixedly connected with a first connecting end plate at one end face away from the old concrete beam, and the added steel pipe truss is fixedly connected with a second connecting end plate at one end close to the side steel plate. The first connecting end plate and the second connecting end plate are connected and fixed by a plurality of first bolts.

3. The assembled node structure of adding steel tube truss beam and old concrete beam according to claim 1 is characterized by: The upper steel plate is U-shaped, and both side edges of the upper steel plate are connected and fixed to the upper ends of the side steel plates via a plurality of transversely distributed second bolts.

4. The assembled node structure of adding steel tube truss beam and old concrete beam according to claim 1 is characterized in that: A lower steel plate is fixedly connected between the lower ends of the two side steel plates.

5. The assembled node structure of adding steel tube truss beam and old concrete beam according to claim 1 is characterized in that: A plurality of evenly distributed annular stiffening steel plates are fixedly connected between the outer peripheral wall of the upper chord connecting steel pipe and the side steel plates, and between the outer peripheral walls at both ends of the lower chord connecting steel pipe and the side steel plates.

6. The assembled node structure of adding steel tube truss beam and old concrete beam according to claim 1 is characterized by: The gap between the node steel skeleton and the old concrete beam is filled with epoxy mortar injected under high pressure.

7. A construction method for adding a steel tube truss beam to an old concrete beam node structure, characterized in that: The method comprises adopting the assembled steel tube truss beam and the old concrete beam node structure as claimed in any one of claims 1 to 6, and comprising the following steps: (1) Remove the sidewalk slab on the old concrete beam, temporarily dismantle the hanger and set up temporary brackets, measure the actual distance between the old concrete beams, and prefabricate steel tube trusses and node steel skeletons in the factory; (2) The node steel frame is hoisted upward from the bottom of the old concrete beam to the designed position, and the upper steel plate is connected to the side steel plate of the node steel frame by the second bolt; (3) The gap between the node steel skeleton and the old concrete beam is filled with epoxy mortar injected under high pressure; (4) hoisting and installing the additional steel tube truss beam, and connecting the second connecting end plate at the end of the additional steel tube truss beam to the first connecting end plate on the node steel skeleton through the first bolt; (5) Reinstall the hangers and concrete sidewalk slabs into place to complete the connection node construction.

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