Main truss fulcrum counter-force position adjusting device for ultra-wide and variable-width PC cable-stayed bridge

Abstract

The utility model discloses a counter-force position adjusting device for a fulcrum of a main truss of an ultra-wide and variable-width PC cable-stayed bridge. The device structurally comprises a middle-lower cross beam (1), a support pad (2) and a main truss connecting plate (3), the middle-lower cross beam (1) is main truss force transmission structure H-shaped steel, the upper portion of the middle-lower cross beam (1) is fixedly connected with the corresponding main truss lower chord member (4), and the lower portion of the middle-lower cross beam (1) and the supporting pad (2) are fully welded to form a whole. The device solves the problem that when an ultra-wide PC cable-stayed bridge is constructed, the counter-force position of a fulcrum of a main truss of a conventional hanging basket cannot be adjusted, so that the counter-force of the fulcrum exceeds the limit when a bridge floor is widened. According to the device, when a bridge floor is widened, the counter-force position and size of a fulcrum of a main truss of the hanging basket can be adjusted by adjusting a lower supporting pad of the middle and lower cross beams, so that active control over stress of a main beam is achieved. Meanwhile, the device forms a'simple support system 'through the support pads and the middle and lower cross beams, the structure stress is clear, and the stress state of the main beam can be improved.

Description

Technical Field

[0001] The utility model relates to the field of cantilever method hanging basket construction, and specifically relates to a device for adjusting the position of the reaction force of the main truss fulcrum of an extra-wide variable-width PC cable-stayed bridge. Background Technique

[0002] The cantilever method hanging basket construction is a relatively common process in the bridge construction process and usually runs through the entire construction period. The conventional rear fulcrum hanging basket anchors the rear end of the hanging basket main beam to the cast beam body through the rear anchoring system. The suspended part at the front end of the hanging basket serves as the working platform for the cast-in-place construction of the next segment of the beam body. Utilize the strength and stability of the hanging basket itself to make it a load-bearing member for the cantilever casting construction of the main beam, and transmit the load to the constructed beam segment through the fulcrum and the anchoring device. At present, the construction method for the rear fulcrum hanging basket of the PC cable-stayed bridge has not been applied, so there are still many problems in the construction:

[0003] (1) The self-weight of the extra-wide main beam of the PC cable-stayed bridge is relatively large, and the force transmission form of the middle and lower cross beams of the main truss as the fulcrum to the beam body is not clear enough, resulting in an increase in construction risks.

[0004] (2) During construction, the middle and lower cross beams of the main truss are placed above the main beam diaphragm. Due to the requirements of the road alignment and road width design, during the construction of the PC cable-stayed bridge, as the road cross-section continuously widens, the force transmission of the middle and lower cross beams as the fulcrum to the solid sections on both sides of the beam body decreases, resulting in a significant increase in the force on the diaphragm and inability to meet the bearing requirements, posing a relatively large risk. Content of the Utility Model

[0005] Therefore, in order to solve the above deficiencies, the utility model provides a device for adjusting the position of the reaction force of the main truss fulcrum of an extra-wide variable-width PC cable-stayed bridge. This device solves the problem that during the construction of an extra-wide PC cable-stayed bridge, the position of the reaction force of the conventional hanging basket main truss fulcrum cannot be adjusted, resulting in the over-limit of the reaction force of the fulcrum when the bridge deck widens. This device can, when the bridge deck widens, adjust the position and magnitude of the reaction force of the hanging basket main truss fulcrum by adjusting the lower pads of the middle and lower cross beams, so as to achieve the active control of the force on the main beam. At the same time, the device forms a "simply supported system" through the pads and the middle and lower cross beams, with clear structural forces and can improve the force state of the main beam.

[0006] The utility model is implemented as follows. A device for adjusting the position of the reaction force of the main truss fulcrum of an extra-wide variable-width PC cable-stayed bridge is constructed, characterized in that the structure of the device includes: a middle and lower cross beam (1), a pad (2), and a main truss connecting plate (3); the middle and lower cross beam (1) is an H-shaped steel for the main truss force transmission structure, the upper part is fixedly connected to the corresponding lower chord of the main truss (4), and the lower part is fully welded to the pad (2) to form an integral body.

[0007] Furthermore; the middle and lower cross beam (1) is welded to the stiffening steel plate (5), and the steel plates are fully welded to each other.

[0008] Furthermore, the cushion (2) is formed into an I-shaped structure by welding steel plates, and is welded internally with the cushion stiffening steel plate (6) to form a stable structure with a certain stiffness.

[0009] Furthermore, the main truss connecting plate (3) is used to connect the lower chord of the main truss (4) and the middle and lower cross beams (1) to ensure full contact therebetween.

[0010] Furthermore, the upper part of the middle and lower cross beams (1) and the lower chord of the main truss are fixedly connected through the main truss connecting plate (3) and bolts.

[0011] Furthermore, the middle and lower cross beams (1) are made of H-shaped steel, the cushions (2) are made of steel plates, and the main truss connecting plates (3) are made of steel plates.

[0012] The utility model has the following advantages: The utility model provides a device for adjusting the reaction force position of the main truss fulcrum of an extra-wide variable-width PC cable-stayed bridge. This device solves the problem that during the construction of an extra-wide PC cable-stayed bridge, the reaction force position of the fulcrum of the conventional hanging basket main truss cannot be adjusted, resulting in the reaction force exceeding the limit when the bridge deck widens. This device can adjust the reaction force position and magnitude of the hanging basket main truss fulcrum by adjusting the lower cushion of the middle and lower cross beams when the bridge deck widens, so as to achieve active control of the stress of the main girder. At the same time, this device forms a "simply supported system" through the cushion and the middle and lower cross beams, with clear structural stress and can improve the stress state of the main girder. Description of the Drawings

[0013] Figure 1 is the front view of the device for adjusting the reaction force position of the fulcrum;

[0014] Figure 2 is the side view of the device for adjusting the reaction force position of the fulcrum.

[0015] Wherein: middle and lower cross beam 1, cushion 2, main truss connecting plate 3, lower chord of the main truss 4, stiffening steel plate 5, cushion stiffening steel plate 6. Detailed Description of the Invention

[0016] The following will combine with the attached Figure 1 - Figure 2 The present invention will be described in detail. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0017] The present utility model provides a device for adjusting the reaction force position of the main truss fulcrum of an ultra-wide variable-width PC cable-stayed bridge. As shown in the figure, the structure of the device includes: a middle and lower cross beam 1, a support pad 2, and a main truss connecting plate 3; the middle and lower cross beam 1 is an H-shaped steel for the main truss force transmission structure, which is fixedly connected to the corresponding lower chord of the main truss at the upper part and is integrally formed by full welding with the support pad 2 at the lower part.

[0018] In the device for adjusting the reaction force position of the main truss fulcrum of the ultra-wide variable-width PC cable-stayed bridge of the present application; the middle and lower cross beam 1 is welded to the stiffening steel plate 5, and the steel plates are fully welded to each other.

[0019] In the device for adjusting the reaction force position of the main truss fulcrum of the ultra-wide variable-width PC cable-stayed bridge of the present application; the support pad 2 is formed into an I-shaped structure by welding steel plates, and is welded to the support pad stiffening steel plate 6 inside to form a stable structure with a certain stiffness.

[0020] In the device for adjusting the reaction force position of the main truss fulcrum of the ultra-wide variable-width PC cable-stayed bridge of the present application; the main truss connecting plate 3 is used to connect the lower chord of the main truss and the middle and lower cross beam 1 to ensure full contact.

[0021] In the device for adjusting the reaction force position of the main truss fulcrum of the ultra-wide variable-width PC cable-stayed bridge of the present application; the upper part of the middle and lower cross beam 1 is fixedly connected to the lower chord of the main truss through the main truss connecting plate 3 and bolts.

[0022] In the device for adjusting the reaction force position of the main truss fulcrum of the ultra-wide variable-width PC cable-stayed bridge of the present application; the middle and lower cross beam 1 is made of H-shaped steel, the support pad 2 is made of steel plate, and the main truss connecting plate 3 is made of steel plate.

[0023] The specific structure and functions in this patent will be described in detail below:

[0024] Middle and lower cross beam 1: An H-shaped steel for the main truss force transmission structure, the upper part is fixedly connected to the lower chord of the main truss through the main truss connecting plate by bolts, and the lower part is integrally formed by full welding with the cushion block according to the actual situation on site. The middle and lower cross beam is welded to the stiffening steel plate, and the steel plates are fully welded to each other.

[0025] Support pad 2: Formed into an I-shaped structure by welding steel plates, and is welded to the stiffening steel plate inside to form a stable structure with a certain stiffness.

[0026] Main truss connecting plate 3: Used to connect the lower chord of the main truss and the middle and lower cross beam to ensure full contact.

[0027] During use: Place a steel support pad under the middle and lower cross beam, and use friction-type high-strength bolts to connect the upper part to the main truss and apply sufficient pre-tightening force; when the width of the main beam needs to be adjusted and the position of the support pad needs to be adjusted, remove the bolts between the middle and lower cross beam and the main truss, move the middle and lower cross beam towards the side truss direction, and re-adjust the position of the support pad according to the calculation.

[0028] This patent has the following advantages and beneficial effects: (1) By adjusting the position of the device pad, the position and magnitude of the reaction force of the hanging basket support can be adjusted to achieve active control of the stress of the main girder, thereby avoiding the safety risks during the construction of the extra-wide main girder of the PC cable-stayed bridge. (2) The device forms a "simply supported system" through the pad and the middle and lower cross beams, with clear force-bearing structure, which can improve the stress state of the main girder. (3) By adjusting the position of the device pad, the problem of over-limit reaction force at the support during the construction of the variable-width main girder of the PC cable-stayed bridge can be solved. (4) This device has a clear force-bearing structure and is easy to operate, and is safer and more reliable than traditional devices.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for adjusting the reaction force position of the main truss support point of an ultra-wide variable-width PC cable-stayed bridge, characterized in that: The structure of the device comprises: a middle and lower cross beam (1), a support pad (2), and a main truss connecting plate (3); the middle and lower cross beam (1) is an H-shaped steel of the main truss force transmission structure, the upper part of which is connected and fixed to the corresponding main truss lower chord (4), and the lower part is fully welded to the support pad (2) to form a whole.

2. According to claim 1, a device for adjusting the reaction force position of the main truss support point of an ultra-wide variable-width PC cable-stayed bridge, characterized in that: The middle and lower cross beam (1) is welded to the stiffening steel plate (5), and the steel plates are fully welded.

3. According to claim 1, a device for adjusting the reaction force position of the main truss support point of an ultra-wide variable-width PC cable-stayed bridge, characterized in that: The support pad (2) is welded with steel plates to form an I-shaped structure, and is internally welded to the support pad reinforcing steel plate (6) to form a stable structure with a certain rigidity.

4. According to claim 1, the device for adjusting the reaction force position of the main truss support point of the ultra-wide variable-width PC cable-stayed bridge is characterized in that: The main truss connecting plate (3) is used to connect the main truss lower chord (4) and the middle and lower cross beam (1) to ensure that they are fully in contact.

5. According to claim 1, the device for adjusting the reaction force position of the main truss support point of the ultra-wide variable-width PC cable-stayed bridge is characterized in that: The upper portion of the middle and lower cross beam (1) is connected and fixed to the lower chord of the main truss via a main truss connecting plate (3) and bolts.

6. According to claim 1, the device for adjusting the reaction force position of the main truss support point of the ultra-wide variable-width PC cable-stayed bridge is characterized in that: The middle and lower cross beam (1) is made of H-shaped steel, the support pad (2) is made of steel plate, and the main truss connecting plate (3) is made of steel plate.

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