A bridge wind tunnel test model

Abstract

The present invention provides a bridge wind tunnel test model, which belongs to the field of bridge testing technology, and includes a main beam bridge deck, two bridge deck connection parts, two side beam connection parts and two side beams. The two bridge deck connection parts are sequentially embedded in the lower surface of the main beam bridge deck along the width direction of the main beam bridge deck, and the lower surface is coplanar with the lower surface of the main beam bridge deck. The two side beam connection parts are slidably arranged on the lower surface of the bridge deck connection part, and correspond to the bridge deck connection part one by one. The side beam connection part is transmission-connected with a linear drive component so that the side beam connection part can continuously reciprocate along the width direction of the main beam bridge deck. The linear drive component is located inside the corresponding bridge deck connection part. The two side beams are buckled on the side beam connection part, and correspond to the side beam connection part one by one. The upper surface of the side beam is in contact with the lower surface of the main beam bridge deck. The bridge wind tunnel test model provided by the present invention realizes the continuous adjustment of the spacing between the two side beams, and improves the convenience of adjusting the spacing between the side beams.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge testing, and more specifically, relates to a bridge wind tunnel test model. Background Art

[0002] Double-sided box girders are widely used in medium-span bridges due to their good economy and material utilization. Due to their blunt body characteristics, double-sided box girders are prone to vortex-induced vibration. Although vortex-induced vibration will not cause the destruction of the bridge, it will cause bridge dysfunction, human discomfort, fatigue damage to components, and may even induce other types of fatal instability. For double-sided box girders, the spacing between the two side box girders is an important factor affecting the vortex-induced vibration characteristics of the main beam and the effectiveness of control measures. Therefore, the spacing between the two side box girders must be analyzed to study the vortex-induced vibration performance of double-sided box girders.

[0003] In wind tunnel tests, there are currently two methods for making models to change the spacing of side box girders: first, a set of models is processed for each spacing, and a new model needs to be re-processed when the spacing is adjusted; second, the main beam bridge deck and the side box girder are made separately, and the side box girder part is pasted to the main beam bridge deck according to the designed spacing. When the spacing is adjusted, the side box girder model needs to be removed and re-pasted to the new position. Both of the above methods have shortcomings. The first method is expensive, and the model needs to be replaced and installed every time the working condition is changed, which is time-consuming and labor-intensive; the second method is an improvement over the first method, but the frequent pasting and removal of the side box girder model also has the problem of being time-consuming and labor-intensive. Summary of the invention

[0004] The object of the present invention is to provide a bridge wind tunnel test model, aiming to facilitate continuous change of the spacing between two side box girders on a main beam bridge deck.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a bridge wind tunnel test model, comprising:

[0006] Main girder bridge deck;

[0007] Two bridge deck connection parts are sequentially embedded in the lower surface of the main beam bridge deck along the width direction of the main beam bridge deck, and the lower surface is coplanar with the lower surface of the main beam bridge deck;

[0008] Two side beam connection parts are slidably arranged on the lower surface of the bridge deck connection part and correspond to the bridge deck connection part one by one, and the side beam connection parts are transmission-connected with linear drive components to enable the side beam connection parts to continuously reciprocate along the width direction of the main beam bridge deck; and

[0009] Two side beams are buckled on the side beam connection parts and correspond to the side beam connection parts one by one, and the upper surface of the side beam is in contact with the lower surface of the main beam bridge deck;

[0010] Wherein, the linear drive assembly is located inside the corresponding bridge deck connecting part.

[0011] In a possible implementation, the side beam connection portion includes a sliding portion slidably connected to the lower surface of the bridge deck connection portion, and the lower surface of the bridge deck connection portion is provided with a notch for the sliding portion to move;

[0012] A plurality of elastic sealing blocks for closing the slot are evenly distributed on the bridge deck connection portion along the length direction of the slot, each of the elastic sealing blocks is vertically slidably arranged in the slot and has elastic freedom in the vertical direction;

[0013] When the elastic sealing block is in a natural state, the lower surface of the elastic sealing block is coplanar with the lower surface of the bridge deck connecting portion, and when the sliding portion moves along the notch, the elastic sealing block is pushed upward by the sliding portion.

[0014] In a possible implementation, the sliding portion has a push-up slope, the push-up slope faces the elastic sealing block, and when the sliding portion moves along the notch, the elastic sealing block abuts against the push-up slope and moves along the push-up slope to be pushed upward.

[0015] In a possible implementation, the elastic sealing block includes:

[0016] A sealing block is vertically slidably disposed on the bridge deck connecting portion, and an outer peripheral wall is in contact with an inner wall of the notch;

[0017] The first elastic member is connected between the sealing block and the bridge deck connecting portion, and is used for pushing the sealing block to move downward.

[0018] In a possible implementation, a plurality of positioning rods are horizontally rotatably arranged in the bridge deck connection portion, the positioning rods correspond to the sealing blocks one by one, and the positioning rods can be rotated to a first direction to limit the upward movement of the sealing blocks and a second direction to avoid the sealing blocks;

[0019] A torsion elastic member is connected between each of the positioning rods and the bridge deck connecting portion, and the torsion elastic member is used to push the positioning rod to rotate toward the first direction;

[0020] The side beam connecting portion further comprises a pushing portion fixedly arranged on the sliding portion, wherein the pushing portion abuts against the positioning rod and is used for pushing the positioning rod to swing so as to make the positioning rod rotate toward the second direction.

[0021] In a possible implementation, when the positioning rod is in the first direction, the positioning rod is separated from the pushing portion, and the positioning rod is against the top of the sealing block, so that the lower surface of the elastic sealing block is coplanar with the lower surface of the bridge deck connecting portion;

[0022] When the positioning rod is in the second direction, the positioning rod abuts against the pushing portion, so that the sliding portion moves to lift the elastic sealing block upward.

[0023] In a possible implementation, the side beam connecting portion further includes a buckling portion fixedly disposed below the sliding portion, and the side beam is buckled on the buckling portion;

[0024] A magnet is fixedly provided on the upper surface of the snap-fitting portion, and the magnet is located at the periphery of the sliding portion. An iron block is fixedly provided on the lower surface of each elastic sealing block. When the elastic sealing block detaches from the sliding portion and falls, the magnet absorbs the iron block so that the elastic sealing block falls to the lower surface which is coplanar with the lower surface of the bridge deck connecting portion.

[0025] In a possible implementation, an iron sheet is attached to the inner wall of the side beam, and when the side beam is buckled on the side beam connecting portion, the magnet absorbs the iron sheet to fix the side beam connecting portion.

[0026] In a possible implementation, the linear drive assembly includes:

[0027] A driving screw rod is rotatably disposed inside the bridge deck connection portion and is threadedly connected to the side beam connection portion, wherein the axial direction of the driving screw rod is the same as the width direction of the main beam bridge deck;

[0028] The driving motor is fixedly arranged inside the bridge deck connecting part, and the output end is connected to the driving screw.

[0029] In a possible implementation, a sliding groove with closed ends is provided on the bridge deck connection portion in the vertical direction, and a sliding block is fixedly provided on the sealing block and is slidably connected to the sliding groove.

[0030] Compared with the prior art, the bridge wind tunnel test model provided by the present invention has the following beneficial effects: on the one hand, during the wind tunnel test, when it is necessary to change the spacing between the two side beams to analyze the vortex-induced vibration performance of the double-sided box girder, it is only necessary to start the linear drive assembly, and the linear drive assembly will drive the side beam connection to move along the width direction of the main beam bridge deck. Since the side beams are buckled on the side beam connection, the movement of the side beam connection will drive the side beams to move synchronously, thereby realizing continuous adjustment of the spacing between the two side beams, greatly improving the convenience and flexibility of adjusting the spacing between the side beams. On the other hand, the linear drive assembly is located inside the bridge deck connection, and the bridge deck connection is embedded in the main beam bridge deck, and the lower surface is coplanar with the lower surface of the main beam bridge deck, so that the entire bridge model structure is more compact, and will not cause damage to the aerodynamic shape of the bridge model itself, thereby ensuring the accuracy of the bridge model wind tunnel test. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the overall structure of a bridge wind tunnel test model provided by an embodiment of the present invention;

[0033] Figure 2 An exploded view of a bridge wind tunnel test model provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of a bridge deck connection portion provided by an embodiment of the present invention;

[0035] Figure 4 A cross-sectional view of a bridge wind tunnel test model provided by an embodiment of the present invention;

[0036] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of part A;

[0037] Figure 6 for Figure 3 Sectional view of the AA plane;

[0038] Figure 7 A cross-sectional view of a bridge deck connection portion provided by an embodiment of the present invention;

[0039] Figure 8 for Figure 7 Schematic diagram of the enlarged structure of part B.

[0040] In the figure: 1, main beam bridge deck; 11, embedded groove; 2, bridge deck connecting part; 21, notch; 22, protrusion; 23, slide groove; 3, side beam connecting part; 31, sliding part; 311, push inclined surface; 32, pushing part; 33, buckling part; 331, magnet; 34, threaded part; 4, side beam; 41, iron sheet; 5, elastic sealing block; 51, sealing block; 511, iron block; 512, sliding block; 52, first elastic member; 61, positioning rod; 62, torsion elastic member; 71, driving screw; 72, driving motor. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] See also Figure 1 and Figure 2 Now, a bridge wind tunnel test model provided by the present invention is described. A bridge wind tunnel test model comprises a main beam bridge deck 1, two bridge deck connection parts 2, two side beam connection parts 3 and two side beams 4.

[0043] Among them, see Figure 1 and Figure 2 , two deck connection parts 2 are sequentially embedded in the lower surface of the main beam bridge deck 1 along the width direction of the main beam bridge deck 1, and the lower surface is coplanar with the lower surface of the main beam bridge deck 1. Two side beam connection parts 3 are slidably arranged on the lower surface of the deck connection part 2, and correspond to the deck connection part 2 one by one. The side beam connection part 3 is transmission-connected with a linear drive component so that the side beam connection part 3 can continuously reciprocate along the width direction of the main beam bridge deck 1. The linear drive component is located inside the corresponding deck connection part 2. Two side beams 4 are buckled on the side beam connection part 3, and correspond to the side beam connection part 3 one by one. The upper surface of the side beam 4 is in contact with the lower surface of the main beam bridge deck 1.

[0044] By setting two side beam connection parts 3 to be slidably set on the lower surface of the bridge deck connection part 2, and transmitting and connecting the linear drive assembly, the side beam connection part 3 can continuously reciprocate along the width direction of the main beam bridge deck 1. During the wind tunnel test, when it is necessary to change the spacing between the two side beams 4 to analyze the vortex-induced vibration performance of the double-sided box girder, the linear drive assembly is started, and the linear drive assembly drives the side beam connection part 3 to move along the width direction of the main beam bridge deck 1. Since the side beam 4 is buckled on the side beam connection part 3, the movement of the side beam connection part 3 will drive the side beam 4 to move synchronously, thereby realizing the continuous adjustment of the spacing between the two side beams 4.

[0045] In addition, the two bridge deck connecting parts 2 are embedded in the lower surface of the main beam bridge deck 1 in sequence along the width direction of the main beam bridge deck 1, and the lower surface is coplanar with the lower surface of the main beam bridge deck 1. At the same time, the upper surface of the side beam 4 is in contact with the lower surface of the main beam bridge deck 1, thereby ensuring the tightness of the connection between the various parts of the model and the structural stability, making the entire bridge model structure more compact, and will not cause damage to the aerodynamic shape of the bridge model itself, thereby ensuring the accuracy of the wind tunnel test of the bridge model.

[0046] Since the main beam bridge deck 1 can be removed from the bridge deck connection 2 and the side beam 4 can be removed from the side beam connection 3, different main beam bridge decks 1 and different side beams 4 can be installed when conducting wind tunnel tests on different bridge models, thereby improving applicability.

[0047] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The side beam connection part 3 includes a sliding part 31 slidably connected to the lower surface of the bridge deck connection part 2, and a slot 21 for the sliding part 31 to move is provided on the lower surface of the bridge deck connection part 2. A plurality of elastic sealing blocks 5 for closing the slot 21 are evenly distributed on the bridge deck connection part 2 along the length direction of the slot 21. Each elastic sealing block 5 is vertically slidably arranged in the slot 21 and has elastic freedom in the vertical direction. When the elastic sealing block 5 is in a natural state, the lower surface of the elastic sealing block 5 is coplanar with the lower surface of the bridge deck connection part 2. When the sliding part 31 moves along the slot 21, the elastic sealing block 5 is pushed upward by the sliding part 31.

[0048] It should be noted that the size of the upper surface of the side beam 4 in the width direction of the main beam bridge deck 1 is larger than the size of the lower surface of the three elastic sealing blocks 5 in the width direction of the main beam bridge deck 1, which enables the upper surface of the side beam 4 to cover the elastic sealing blocks 5 in the raised state, thereby ensuring that the elastic sealing blocks 5 exposed to the outside are all in a natural state, ensuring that the notches 21 exposed to the outside are all in a closed state, and ensuring the integrity of the model's appearance.

[0049] Specifically, when the sliding part 31 moves along the notch 21, the elastic sealing block 5 will be pushed up by the sliding part 31, thereby making room for the movement of the sliding part 31, ensuring that the sliding part 31 can move smoothly in the notch 21, realizing the position adjustment of the side beam connection part 3, and then driving the side beam 4 to change the spacing. After the sliding part 31 passes, the elastic sealing block 5 falls to the lower surface coplanar with the lower surface of the bridge deck connection part 2, thereby closing the notch 21, ensuring the flatness of the lower surface of the bridge deck connection part 2 and the integrity of the model appearance.

[0050] In some embodiments, see Figure 5The sliding portion 31 has a push-up inclined surface 311 , which faces the elastic sealing block 5 . When the sliding portion 31 moves along the notch 21 , the elastic sealing block 5 abuts against the push-up inclined surface 311 and moves along the push-up inclined surface 311 to be pushed upward.

[0051] It should be understood that two pushing inclined surfaces 311 are provided on the sliding portion 31 , which ensures that the sliding portion 31 can push up the elastic sealing blocks 5 on both sides when reciprocating in the slot 21 .

[0052] Specifically, the pushing slope 311 enables the elastic sealing block 5 to rise more smoothly along the pushing slope 311 when being pushed up, reducing the jamming phenomenon during the pushing up process, ensuring that the sliding part 31 can move continuously and stably in the groove 21, thereby ensuring the accuracy and timeliness of the position adjustment of the side beam connecting part 3, so as to better realize the precise adjustment of the spacing between the side beams 4 and meet the requirements of wind tunnel tests for different spacing settings.

[0053] In some embodiments, see Figure 5 and Figure 6 The elastic sealing block 5 includes a sealing block 51 and a first elastic member 52. The sealing block 51 is vertically slidably arranged on the bridge deck connection part 2, and the outer peripheral wall is in contact with the inner wall of the notch 21. The first elastic member 52 is connected between the sealing block 51 and the bridge deck connection part 2, and is used to push the sealing block 51 to move downward.

[0054] Exemplarily, the first elastic member 52 is a spring, one end of the spring is fixed to the bridge deck connecting portion 2 , and the other end of the spring is fixed to the sealing block 51 .

[0055] Specifically, after the sliding portion 31 moves past the elastic sealing block 5, the first elastic member 52 pushes the sealing block 51 to move downward, so that it returns to its natural state, that is, the lower surface is coplanar with the lower surface of the bridge deck connecting portion 2, and the slot 21 is re-closed. At the same time, the tight fit between the outer peripheral wall of the sealing block 51 and the inner wall of the slot 21 further enhances the sealing effect of the slot 21, so that the external airflow does not enter the slot 21, ensuring the integrity of the aerodynamic shape of the model and the accuracy of the wind tunnel test.

[0056] Based on the above embodiments, further see Figure 6 A sliding groove 23 with closed ends is provided on the bridge deck connection part 2 in the vertical direction, and a slider 512 is fixedly provided on the sealing block 51 and is slidably connected to the sliding groove 23. The sliding groove 23 is a dovetail groove, and the slider 512 is a dovetail block. When the slider 512 abuts against the bottom end of the sliding groove 23, the lower surface of the sealing block 51 is coplanar with the lower surface of the bridge deck connection part 2.

[0057] The slide groove 23 provides a stable guide for the up and down movement of the sealing block 51, ensuring that the sealing block 51 can move accurately and smoothly in the vertical direction, and ensuring the stability of the elastic sealing block 5 during the process of being lifted and reset. At the same time, the slide groove 23 also plays a role in limiting the sealing block 51. When the slider 512 is against the bottom end of the slide groove 23, the lower surface of the sealing block 51 is coplanar with the lower surface of the bridge deck connection part 2, ensuring that the sealing block 51 will not extend from the lower surface of the bridge deck connection part 2, and ensuring the flatness of the lower surface of the bridge deck connection part 2.

[0058] In some embodiments, see Figure 6 , Figure 7 and Figure 8 A plurality of positioning rods 61 are horizontally rotatably arranged in the bridge deck connection part 2. The positioning rods 61 correspond to the sealing blocks 51 one by one. The positioning rods 61 can be rotated to a first direction for limiting the upward movement of the sealing blocks 51 and a second direction for avoiding the sealing blocks 51. A torsional elastic member 62 is connected between each positioning rod 61 and the bridge deck connection part 2. The torsional elastic member 62 is used to push the positioning rod 61 to rotate in the first direction. The side beam connection part 3 also includes a pushing part 32 fixedly arranged on the sliding part 31. The pushing part 32 abuts against the positioning rod 61 and is used to push the positioning rod 61 to swing so that the positioning rod 61 rotates in the second direction.

[0059] Exemplarily, the torsion elastic member 62 is a torsion spring, one end of which is fixed to the rotation axis of the positioning rod 61 , and the other end of which is fixed to the positioning rod 61 .

[0060] Specifically, when the positioning rod 61 is in the first direction, the position of the block 51 is fixed, so that the lower surface of the block 51 is coplanar with the lower surface of the bridge deck connection part 2, ensuring the closure of the slot 21. When the model undergoes vortex-induced vibration, the block 51 will not shake up and down relative to the bridge deck connection part 2 due to vibration, thereby ensuring the flatness of the lower surface of the bridge deck connection part 2 and the integrity of the aerodynamic shape of the model.

[0061] When the sliding portion 31 of the side beam connecting portion 3 moves, the fixed pushing portion 32 thereof will abut against the positioning rod 61, pushing the positioning rod 61 to rotate in the second direction, thereby avoiding the opening block 51, so that the sliding portion 31 can smoothly lift the sealing block 51 upward, thereby achieving precise control over the movement of the sealing block 51, ensuring that the sealing block 51 can be lifted when needed, and the slot 21 can be closed when not needed, further improving the performance and reliability of the model.

[0062] In some embodiments, when the positioning rod 61 is in the first direction, the positioning rod 61 is separated from the pushing portion 32, and the positioning rod 61 abuts against the top of the sealing block 51, so that the lower surface of the elastic sealing block 5 is coplanar with the lower surface of the bridge deck connecting portion 2. When the positioning rod 61 is in the second direction, the positioning rod 61 abuts against the pushing portion 32, so that the sliding portion 31 moves to lift the elastic sealing block 5 upward.

[0063] In some embodiments, see Figure 5 The side beam connection part 3 also includes a buckling part 33 fixedly arranged below the sliding part 31, and the side beam 4 is buckled on the buckling part 33. A magnet 331 is fixedly arranged on the upper surface of the buckling part 33, and the magnet 331 is located at the periphery of the sliding part 31. An iron block 511 is fixedly arranged on the lower surface of each elastic sealing block 5. When the elastic sealing block 5 is separated from the sliding part 31 and falls, the magnet 331 attracts the iron block 511, so that the elastic sealing block 5 falls to the lower surface coplanar with the lower surface of the bridge deck connection part 2.

[0064] Specifically, the iron block 511 is fixedly arranged on the lower surface of the sealing block 51. Through the magnet 331 and the iron block 511, when the sealing block 51 is separated from the sliding part 31 and falls, the magnet 331 will attract the iron block 511, so that the elastic sealing block 5 falls to the lower surface coplanar with the lower surface of the bridge deck connecting part 2, realizing the automatic reset function of the sealing block 51, ensuring the accuracy of the falling position of the sealing block 51, and avoiding the situation that the sealing block 51 does not fall completely.

[0065] In some embodiments, see Figure 5 The inner wall of the side beam 4 is pasted with an iron sheet 41. When the side beam 4 is buckled on the side beam connection part 3, the magnet 331 adsorbs the iron sheet 41 to fix the side beam connection part 3. The side beam 4 is firmly connected to the side beam connection part 3 by magnet adsorption. During the wind tunnel test, even if it is affected by external forces such as airflow, the side beam 4 can be firmly buckled on the side beam connection part 3, ensuring the stability of the model structure and the accuracy and reliability of the test data. At the same time, since the iron sheet 41 and the side beam 4 are bonded, when the side beam 4 is replaced, the iron sheet 41 can be more conveniently disassembled and assembled.

[0066] In some embodiments, see Figure 2 A groove 11 for accommodating the bridge deck connection part 2 is provided on the lower surface of the main beam bridge deck 1. A protrusion 22 is fixedly provided on the outer peripheral wall of the bridge deck connection part 2, so that when the bridge deck connection part 2 is embedded in the groove 11, the protrusion 22 can be pressed against the inner wall of the groove 11, thereby ensuring the stability of the bridge deck connection part 2.

[0067] In some embodiments, see Figure 2 , Figure 7 and Figure 8The linear drive assembly includes a drive screw 71 and a drive motor 72. The drive screw 71 is rotatably arranged inside the bridge deck connection part 2 and is threadedly connected to the side beam connection part 3. The axial direction of the drive screw 71 is the same as the width direction of the main beam bridge deck 1. The drive motor 72 is fixedly arranged inside the bridge deck connection part 2, and the output end is connected to the drive screw 71.

[0068] When the spacing of the side beams 4 needs to be adjusted, the drive motor 72 is started, and the drive motor 72 drives the drive screw 71 to rotate. Since the drive screw 71 is threadedly connected to the side beam connection part 3, the side beam connection part 3 will move along the width direction of the main beam bridge deck 1, thereby driving the side beam 4 buckled on the side beam connection part 3 to move, thereby achieving precise adjustment of the spacing of the side beams 4. By controlling the rotation direction and number of turns of the drive motor 72, the movement of the side beam 4 can be accurately controlled, thereby achieving precise adjustment of the spacing between the two side beams 4, meeting the requirements of wind tunnel tests for different spacing settings.

[0069] In summary, compared with the prior art, the bridge wind tunnel test model provided by the present invention has the following advantages: during the wind tunnel test, when the spacing between the two side beams 4 needs to be changed to analyze the vortex-induced vibration performance of the double-sided box girder, it is only necessary to start the linear drive assembly, and the linear drive assembly will drive the side beam connection part 3 to move along the width direction of the main beam bridge deck 1. Since the side beam 4 is buckled on the side beam connection part 3, the movement of the side beam connection part 3 will drive the side beam 4 to move synchronously, thereby realizing the continuous adjustment of the spacing between the two side beams 4, which greatly improves the convenience and flexibility of adjusting the spacing between the side beams.

[0070] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge wind tunnel test model, characterized in that: include: Main girder bridge deck (1); Two bridge deck connection parts (2) are sequentially embedded in the lower surface of the main beam bridge deck (1) along the width direction of the main beam bridge deck (1), and the lower surface is coplanar with the lower surface of the main beam bridge deck (1); Two side beam connection parts (3) are slidably arranged on the lower surface of the bridge deck connection part (2) and correspond one to one with the bridge deck connection part (2), and the side beam connection parts (3) are transmission-connected to a linear drive assembly so that the side beam connection parts (3) can continuously reciprocate along the width direction of the main beam bridge deck (1); and Two side beams (4) are buckled on the side beam connection portion (3) and correspond one to one with the side beam connection portion (3); the upper surface of the side beam (4) is in contact with the lower surface of the main beam bridge deck (1); Wherein, the linear drive assembly is located inside the corresponding bridge deck connection portion (2); The side beam connection part (3) comprises a sliding part (31) slidably connected to the lower surface of the bridge deck connection part (2), and the lower surface of the bridge deck connection part (2) is provided with a notch (21) for the sliding part (31) to move; A plurality of elastic sealing blocks (5) for closing the slot (21) are evenly distributed on the bridge deck connection portion (2) along the length direction of the slot (21), each of the elastic sealing blocks (5) being vertically slidably disposed in the slot (21) and having elastic freedom in the vertical direction; When the elastic sealing block (5) is in a natural state, the lower surface of the elastic sealing block (5) is coplanar with the lower surface of the bridge deck connecting portion (2), and when the sliding portion (31) moves along the notch (21), the elastic sealing block (5) is pushed upward by the sliding portion (31).

2. A bridge wind tunnel test model as claimed in claim 1, characterized in that: The sliding portion (31) has a push-up inclined surface (311), the push-up inclined surface (311) faces the elastic sealing block (5), and when the sliding portion (31) moves along the notch (21), the elastic sealing block (5) abuts against the push-up inclined surface (311) and moves along the push-up inclined surface (311) to be pushed upwards.

3. A bridge wind tunnel test model as claimed in claim 1, characterized in that: The elastic sealing block (5) comprises: A sealing block (51) is vertically slidably disposed on the bridge deck connecting portion (2), and its outer peripheral wall is in contact with the inner wall of the notch (21); A first elastic member (52) is connected between the sealing block (51) and the bridge deck connecting portion (2) and is used to push the sealing block (51) to move downward.

4. A bridge wind tunnel test model as claimed in claim 3, characterized in that: A plurality of positioning rods (61) are horizontally rotatably arranged in the bridge deck connection portion (2), the positioning rods (61) corresponding one to the sealing blocks (51), and the positioning rods (61) can be rotated to a first direction for limiting the upward movement of the sealing blocks (51) and a second direction for avoiding the sealing blocks (51); A torsion elastic member (62) is connected between each positioning rod (61) and the bridge deck connecting portion (2), and the torsion elastic member (62) is used to push the positioning rod (61) to rotate in the first direction; The side beam connecting portion (3) further comprises a pushing portion (32) fixedly arranged on the sliding portion (31), wherein the pushing portion (32) abuts against the positioning rod (61) and is used to push the positioning rod (61) to swing, so that the positioning rod (61) rotates towards the second direction.

5. A bridge wind tunnel test model as claimed in claim 4, characterized in that: When the positioning rod (61) is in the first direction, the positioning rod (61) is separated from the pushing portion (32), and the positioning rod (61) abuts against the top of the sealing block (51), so that the lower surface of the elastic sealing block (5) is coplanar with the lower surface of the bridge deck connecting portion (2); When the positioning rod (61) is in the second direction, the positioning rod (61) abuts against the pushing portion (32), so that the sliding portion (31) moves to lift the elastic sealing block (5) upward.

6. A bridge wind tunnel test model as claimed in claim 1, characterized in that: The side beam connecting portion (3) further comprises a buckling portion (33) fixedly arranged below the sliding portion (31), and the side beam (4) is buckled onto the buckling portion (33); A magnet (331) is fixedly provided on the upper surface of the buckling portion (33), and the magnet (331) is located at the periphery of the sliding portion (31). An iron block (511) is fixedly provided on the lower surface of each elastic sealing block (5). When the elastic sealing block (5) is detached from the sliding portion (31) and falls, the magnet (331) absorbs the iron block (511) so that the elastic sealing block (5) falls to a lower surface that is coplanar with the lower surface of the bridge deck connecting portion (2).

7. A bridge wind tunnel test model as claimed in claim 6, characterized in that: An iron sheet (41) is adhered to the inner wall of the side beam (4), and when the side beam (4) is buckled onto the side beam connecting portion (3), the magnet (331) absorbs the iron sheet (41) to fix the side beam connecting portion (3).

8. The bridge wind tunnel test model according to claim 1, characterized in that: The linear drive assembly comprises: A driving screw rod (71) is rotatably disposed inside the bridge deck connection portion (2) and is threadedly connected to the side beam connection portion (3); the axial direction of the driving screw rod (71) is the same as the width direction of the main beam bridge deck (1); A driving motor (72) is fixedly arranged inside the bridge deck connecting portion (2), and an output end is connected to the driving screw rod (71).

9. A bridge wind tunnel test model as claimed in claim 3, characterized in that: A sliding groove (23) with closed ends is provided on the bridge deck connection portion (2) in the vertical direction, and a sliding block (512) is fixedly provided on the sealing block (51) and is slidably connected to the sliding groove (23).

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