An assembled bridge double-layer combined steel truss structure

Abstract

The present invention discloses an assembled bridge double-layer combined steel truss structure, which relates to the technical field of assembled bridge trusses. It includes a truss splicing unit part, and the truss splicing unit part includes an upper beam, a lower beam, and a web member assembly arranged between the upper beam and the lower beam. The upper beam and the lower beam are parallel to each other and are in a set plane. Connecting rods are connected between the two ends of the upper beam and the lower beam respectively. The connecting rods are located in the set plane, and the two ends of each connecting rod are respectively hinged to one end of the corresponding upper beam and lower beam. After the trusses are spliced, the connection points of the lower beams and the connection points of the upper beams of adjacent truss splicing unit parts can be staggered from each other. In this way, the connection strength between adjacent truss splicing unit parts after splicing can be improved. In addition, through the above design, when the upper beam or the lower beam is stressed, the force can be decomposed to the upper beam and the lower beam of the entire truss through the guidance of the connecting rod, improving the overall strength of the truss.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated bridge trusses, and specifically to a prefabricated bridge double-layer combined steel truss structure. Background Technique

[0002] A truss bridge refers to a bridge with trusses as the main load-bearing components of the upper structure. A truss bridge generally consists of a main bridge truss, upper and lower horizontal longitudinal bracings, portal frames, intermediate cross bracings, and a deck system. In a truss, chord members are the members that form the periphery of the truss, including upper chord members and lower chord members. The members connecting the upper and lower chord members are called web members, and are further divided into diagonal members and vertical members according to the direction of the web members. The plane where the chord members and web members are located is called the main truss plane. The bridge height of a long-span bridge truss changes along the span direction, forming a curved chord truss; for medium and small spans, a constant truss height is adopted, that is, the so-called flat chord truss or straight chord truss.

[0003] Currently, most such trusses are assembled on-site, and a crane is used to hoist and splice the truss components one by one. The installation efficiency of such a truss installed in this way is low, and after splicing, the strength of the splicing position is poor; although there are also integral trusses on the market, which are directly hoisted and installed as a whole during installation, their large volume is inconvenient for fixed-point storage and transportation. Summary of the Invention

[0004] The purpose of the present invention is to provide a prefabricated bridge double-layer combined steel truss structure to solve the problems raised in the above background technique.

[0005] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0006] The prefabricated bridge double-layer combined steel truss structure provided by the present invention includes a truss splicing unit part. The truss splicing unit part includes an upper beam, a lower beam, and a web member assembly arranged between the upper beam and the lower beam. The upper beam and the lower beam are parallel to each other and are in a set plane. Connecting rods are connected between the two ends of the upper beam and the lower beam. The connecting rods are located in the set plane, and the two ends of each connecting rod are respectively hinged to one end of the corresponding upper beam and lower beam. The upper beam, the lower beam, and a pair of connecting rods enclose an installation space for installing the web member assembly, and the cross-section of the installation space in the set plane is a parallelogram.

[0007] The web member assembly includes an upper arched rod, a lower arched rod, and a tension rod member. The two ends of the upper arched rod are respectively hinged to the two ends of the upper beam, and the middle part of the upper arched rod abuts against the side of the lower beam relative to the upper beam. The two ends of the lower arched rod are respectively hinged to the two ends of the lower beam, and the middle part of the lower arched rod abuts against the side of the upper beam relative to the lower beam. The tension rod member is connected between the upper arched rod and the lower arched rod.

[0008] Further, the opposite sides of the upper beam and the lower beam are respectively an upper connection surface and a lower connection surface. The hinge points at both ends of the upper arched rod are respectively located at two diagonal positions of the upper connection surface, and the middle part of the upper arched rod abuts against the middle line of the width of the lower connection surface; the hinge points at both ends of the lower arched rod are respectively located at two diagonal positions of the lower connection surface, and the middle part of the lower arched rod abuts against the middle line of the width of the upper connection surface. The plane where the upper arched rod is located intersects with the plane of the lower arched rod.

[0009] Further, the whole of the tension member is in an N shape, and it includes a middle rod part and inclined rod parts connected to both ends of the middle rod part. Among them, both ends of the middle rod part are respectively hinged to the middle parts of the upper arched rod and the lower arched rod, and the ends of the two inclined rod parts far from the middle rod part are respectively hinged to the upper arched rod and the lower arched rod.

[0010] Further, first hinge seats are symmetrically arranged at both ends of the upper beam, second hinge seats are symmetrically arranged at both ends of the lower beam, both ends of the connecting rod are respectively hinged to the corresponding first hinge seats and second hinge seats, both ends of the upper arched rod are respectively hinged to a pair of first hinge seats, and both ends of the lower arched rod are respectively hinged to a pair of second hinge seats.

[0011] Further, the first hinge seats and the second hinge seats are respectively slidably arranged on the upper beam and the lower beam. First limit sleeves are fixedly arranged at both ends of the upper beam, second limit sleeves are fixedly arranged at both ends of the lower beam. The first hinge seat abuts against the side surface of the corresponding first limit sleeve, and the second hinge seat abuts against the side surface of the corresponding second limit sleeve.

[0012] Further, clamping grooves are provided at the same ends of the upper beam and the lower beam, and clamping blocks adapted to the clamping grooves are provided at the same other ends of the upper beam and the lower beam. First bolt holes are penetrated through the upper beam and the lower beam at the positions of the clamping grooves, and second bolt holes corresponding to the first bolt holes are penetrated through the clamping blocks.

[0013] Further, convex blocks corresponding to the clamping blocks are arranged on the first limit sleeves and the second limit sleeves at one end of the clamping blocks. After the truss splicing unit parts are spliced, the convex blocks of the first limit abut against the side surface of the adjacent first limit sleeve, and the convex blocks of the second limit abut against the side surface of the adjacent second limit sleeve.

[0014] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0015] 1. After the trusses are spliced, the connection points of the lower beams and the connection points of the upper beams of adjacent truss splicing unit parts can be mutually offset. In this way, the connection strength between adjacent truss splicing unit parts after splicing can be improved.

[0016] In addition, through the above design, when the upper beam or the lower beam is stressed, the force can be decomposed onto the upper beam and the lower beam of the entire truss through the guidance of the connecting rod. Specific principle: Since the main stress direction of the truss is perpendicular to the upper beam and the lower beam, when the upper beam and the lower beam are stressed, they will move in the direction of the stress, that is, the upper beam and the lower beam will have a tendency to move downward after being stressed. However, since the upper beam, the lower beam and a pair of connecting rods form a parallelogram shape, under the traction of the connecting rod, the upper beam and the lower beam not only have a tendency to move downward after being stressed, but also have a tendency to move laterally. This tendency of lateral movement can decompose the force onto the axial direction of the upper beam or the lower beam of the entire truss when it is stressed.

[0017] 2. By changing the angle setting of the upper arch rod and the lower arch rod, the present invention enables the lower arch rod and the upper arch rod to form an intersecting structure in space. In this way, on the premise of minimizing the steel consumption as much as possible, only through the space support structure formed by the upper arch rod, the lower arch rod and the tension rod in the installation space surrounded by the upper beam, the lower beam and a pair of connecting rods, it can not only produce a good support effect when receiving a vertical force, but also have excellent anti-lateral force performance when receiving a lateral force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0019] Figure 1 is a schematic structural view of the first perspective of the truss splicing unit part of the present invention;

[0020] Figure 2 is a schematic structural view of the second perspective of the truss splicing unit part of the present invention;

[0021] Figure 3 is a front view structural schematic diagram of the truss splicing unit part of the present invention;

[0022] Figure 4 is Figure 1 a partial structural schematic diagram at A of

[0023] Figure 5 is a schematic structural view of the tension rod of the present invention;

[0024] Figure 6 is a top view structural schematic diagram of the tension rod of the present invention;

[0025] Figure 7 is a schematic structural view when the truss splicing unit part of the present invention;

[0026] Figure 8It is a front view structural schematic diagram of the truss splicing unit part of the present invention.

[0027] In the figure:

[0028] 100, truss splicing unit part; 200, bump

[0029] 110, upper beam; 111, upper connection surface

[0030] 120, lower beam; 121, lower connection surface

[0031] 130, web member assembly; 131, upper arched rod; 132, lower arched rod; 133, tension member; 133a, middle rod part; 133b, inclined rod part

[0032] 140, connecting rod; 150, first hinge seat; 160, second hinge seat; 170, first limit sleeve; 180, second limit sleeve; 190, card slot; 191, card block; 192, first bolt hole; 193, second bolt hole Specific embodiments

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0034] Please refer to Figures 1-8 , the present invention provides an assembled bridge double-layer combined steel truss structure, including a truss splicing unit part 100. The truss splicing unit part 100 is a component unit of the truss. Multiple truss splicing unit parts 100 can be spliced end to end to form a complete truss, so as to facilitate transportation and reduce the installation difficulty.

[0035] Since a complete truss is composed of multiple truss splicing unit parts 100, when multiple truss splicing unit parts 100 are spliced, the strength at the connection of adjacent truss splicing unit parts 100 is the weakest position of the entire truss. In order to improve the strength at the connection of the truss splicing unit part 100.

[0036] In this technical solution, the truss splicing unit part 100 includes an upper beam 110, a lower beam 120, and a web member assembly 130 disposed between the upper beam 110 and the lower beam 120. The upper beam 110 and the lower beam 120 are parallel to each other and in a set plane. Connecting rods 140 are connected between both ends of the upper beam 110 and the lower beam 120. The connecting rods 140 are in the set plane, and both ends of each connecting rod 140 are hinged to one end of the corresponding upper beam 110 and lower beam 120 respectively. The upper beam 110, the lower beam 120, and a pair of connecting rods 140 enclose an installation space for installing the web member assembly 130, and the cross-section of the installation space in the set plane is a parallelogram.

[0037] Through the above design, after the trusses are spliced, the connection points of the lower beams 120 and the connection points of the upper beams 110 of adjacent truss splicing unit parts 100 can be offset from each other. In this way, the connection strength between adjacent truss splicing unit parts 100 after splicing can be improved (in the conventional technology, the connection points of the lower beams 120 and the connection points of the upper beams 110 of adjacent truss splicing unit parts 100 are all in the same vertical plane).

[0038] In addition, through the above design, when the upper beam 110 or the lower beam 120 is stressed, the force can be decomposed to the upper beam 110 and the lower beam 120 of the entire truss through the guidance of the connecting rod 140. The specific principle is as follows: Since the main stress direction of the truss is perpendicular to the upper beam 110 and the lower beam 120, when the upper beam 110 and the lower beam 120 are stressed, they will move in the direction of the stress, that is, the upper beam 110 and the lower beam 120 will have a tendency to move downward after being stressed. However, since the upper beam 110, the lower beam 120, and a pair of connecting rods 140 form a parallelogram, under the traction of the connecting rod 140, the upper beam 110 and the lower beam 120 not only have a tendency to move downward after being stressed, but also have a tendency to move horizontally. This tendency to move horizontally can decompose the force to the axial direction of the upper beam 110 or the lower beam 120 of the entire truss when it is stressed.

[0039] It should be noted that the above-mentioned "tendency" does not mean that the upper beam 110 or the lower beam 120 will displace. It is only proposed for the convenience of explaining its stress situation. Therefore, it should be known that the upper beam 110 or the lower beam 120 will not displace when it is stressed.

[0040] On the contrary, when the upper beam 110 or the lower beam 120 is subjected to an axial acting force, the force can also be decomposed to the web member assembly 130 through the above design.

[0041] Among the truss splicing unit part 100, the web member assembly 130 is arranged between the upper beam 110 and the lower beam 120. Its main function is to connect the upper beam 110 and the lower beam 120 to form an integral whole, and play a certain role in auxiliary support. Therefore, the dimensions of the web member assembly 130 are all smaller than those of the upper beam 110 and the lower beam 120. Correspondingly, its strength is also slightly lower. If the strength of the web member assembly 130 can be improved without increasing its size, the overall strength of the truss splicing unit part 100 can be enhanced.

[0042] Therefore, in this technical solution, the web member assembly 130 includes an upper arched rod 131, a lower arched rod 132 and a tension rod member 133. The two ends of the upper arched rod 131 are respectively hinged to the two ends of the upper beam 110, and the middle part of the upper arched rod 131 abuts against one side of the lower beam 120 relative to the upper beam 110. The two ends of the lower arched rod 132 are respectively hinged to the two ends of the lower beam 120, and the middle part of the lower arched rod 132 abuts against one side of the upper beam 110 relative to the lower beam 120. The tension rod member 133 is connected between the upper arched rod 131 and the lower arched rod 132.

[0043] The above design adopts the characteristic of high strength of arched support, which can improve the connection strength between the upper beam 110 and the lower beam 120 and limit the distance between the upper beam 110 and the lower beam 120. When it is stressed, the upper beam 110, the lower beam 120, the upper arched rod 131, the lower arched rod 132 and the tension rod member 133 jointly produce a supporting effect, effectively improving the overall strength of the truss.

[0044] After the truss is installed, the truss is not only subjected to vertical forces, but also subjected to lateral forces (slight lateral sway of the bridge). In conventional technologies, most of the web member assemblies 130 are vertically arranged. In this way, when subjected to lateral forces, the main stress points are mostly concentrated at the joints of the web member assembly 130 with the upper beam 110 and the lower beam 120.

[0045] For this reason, in this embodiment, the opposite sides of the upper beam 110 and the lower beam 120 are respectively an upper connection surface 111 and a lower connection surface 121. The hinge points at both ends of the upper arched rod 131 are respectively located at two diagonal positions of the upper connection surface 111, and the middle part of the upper arched rod 131 abuts against the middle line of the width of the lower connection surface 121. The hinge points at both ends of the lower arched rod 132 are respectively located at two diagonal positions of the lower connection surface 121, and the middle part of the lower arched rod 132 abuts against the middle line of the width of the upper connection surface 111. The plane where the upper arched rod 131 is located intersects with the plane of the lower arched rod 132.

[0046] By changing the angle settings of the upper arch rod 131 and the lower arch rod 132, a cross structure is formed between the lower arch rod 132 and the upper arch rod 131 in space. In this way, on the premise of minimizing the steel consumption as much as possible, only through the space support structure formed by the upper arch rod 131, the lower arch rod 132 and the tension rod member 133 in the installation space surrounded by the upper beam 110, the lower beam 120 and a pair of connecting rods 140, not only can it produce a good support effect when subjected to a vertical force, but also it has excellent performance in resisting lateral forces when subjected to a lateral force.

[0047] Further, in this embodiment, the whole of the tension rod member 133 is in an N shape, and it includes a middle rod portion 133a and inclined rod portions 133b connected to both ends of the middle rod portion 133a. Among them, both ends of the middle rod portion 133a are respectively hinged to the middle parts of the upper arch rod 131 and the lower arch rod 132, and one ends of the two inclined rod portions 133b far from the middle rod portion 133a are respectively hinged to the upper arch rod 131 and the lower arch rod 132.

[0048] In the above design, the middle rod portion 133a of the tension rod member 133 and the inclined rod portions 133b at both ends thereof are not in the same plane. The two middle rod portions 133a and the inclined rod portions 133b are cross each other in the width direction of the upper beam 110 and the lower beam 120 (inside the installation space), and also form a connection structure in space. Further, the vertical support and the resistance to lateral impact are improved.

[0049] In order to facilitate the assembly of the truss splicing unit portion 100, in this embodiment, first hinge seats 150 are symmetrically arranged at both ends of the upper beam 110, second hinge seats 160 are symmetrically arranged at both ends of the lower beam 120, both ends of the connecting rod 140 are respectively hinged to the corresponding first hinge seats 150 and second hinge seats 160, both ends of the upper arch rod 131 are respectively hinged to a pair of first hinge seats 150, and both ends of the lower arch rod 132 are respectively hinged to a pair of second hinge seats 160; the first hinge seats 150 and the second hinge seats 160 are respectively slidably arranged on the upper beam 110 and the lower beam 120. First limiting sleeves 170 are fixedly arranged at both ends of the upper beam 110, second limiting sleeves 180 are fixedly arranged at both ends of the lower beam 120. The first hinge seats 150 abut against the sides of the corresponding first limiting sleeves 170, and the second hinge seats 160 abut against the sides of the corresponding second limiting sleeves 180.

[0050] The above design can facilitate the installation of the web member assembly 130. That is, a pair of connecting rods 140, an upper arch rod 131, and a lower arch rod 132 are connected through a pair of first hinge seats 150 and a pair of second hinge seats 160 to form a whole. During assembly, the pair of first hinge seats 150 and the pair of second hinge seats 160 are slid onto the upper beam 110 and the lower beam 120, and the positions of the first hinge seats 150 and the pair of second hinge seats 160 are fixed by the first limiting sleeve 170 and the second limiting sleeve 180. Subsequently, the first limiting sleeve 170 and the second limiting sleeve 180 can be fixedly connected to the upper beam 110 and the lower beam 120 respectively through connection methods such as bolts or welding.

[0051] In this embodiment, clamping grooves 190 are provided at the same ends of the upper beam 110 and the lower beam 120, and clamping blocks 191 adapted to the clamping grooves 190 are provided at the same other ends of the upper beam 110 and the lower beam 120. First bolt holes 192 are provided through the upper beam 110 and the lower beam 120 at the positions of the clamping grooves 190, and second bolt holes 193 corresponding to the first bolt holes 192 are provided through the clamping blocks 191.

[0052] The above design facilitates the splicing of the truss splicing unit part 100. During splicing, the clamping block 191 of one truss splicing unit part 100 is inserted into the clamping groove 190 of another truss splicing unit part 100, and the two truss splicing unit parts 100 are fixed by bolts passing through the first bolt holes 192 and the second bolt holes 193. Subsequently, repeating the above operation can complete the assembly of the entire truss.

[0053] When the upper arch rod 131 and the lower arch rod 132 are stressed, there is a tendency for their two ends to move towards both sides. This tendency of movement will act on the second limiting sleeve 180 and the first limiting sleeve 170. Considering the stress conditions of the second limiting sleeve 180 and the first limiting sleeve 170, in order to prevent the joints between the second limiting sleeve 180 and the first limiting sleeve 170 and the upper beam 110 and the lower beam 120 from breaking due to stress.

[0054] Therefore, in this embodiment, bumps 200 corresponding to the clamping blocks 191 are provided on the first limiting sleeve 170 and the second limiting sleeve 180 at one end of the clamping block 191. After the truss splicing unit part 100 is spliced, the bump 200 of the first limiting sleeve 170 abuts against the side surface of the adjacent first limiting sleeve 170, and the bump 200 of the second limiting sleeve 180 abuts against the side surface of the adjacent second limiting sleeve 180.

[0055] In the above design, when the first limiting sleeve 170 and the second limiting sleeve 180 are stressed, the acting force will be decomposed to another first limiting sleeve 170 and second limiting sleeve 180 through the bump 200, that is, to the web member assembly 130 of another truss splicing unit portion 100. And when the other web member assembly 130 is stressed, it will also act on its corresponding upper beam 110 and lower beam 120. In this way, the acting force can be further decomposed, which not only improves the strength of the truss splicing unit portion 100, but also prevents the joints between the second limiting sleeve 180 and the first limiting sleeve 170 and the upper beam 110 and the lower beam 120 from breaking due to stress.

[0056] It should be specifically noted that in the above analysis, a certain truss splicing unit portion 100 is stressed. However, in actual process, multiple truss splicing unit portions 100 are stressed simultaneously. Therefore, after the adjacent truss splicing unit portions 100 are stressed, there is a relative movement tendency between the adjacent first limiting sleeves 170 and second limiting sleeves 180. In this way, when the truss is stressed, the abutment of the second limiting sleeves 180 and the first limiting sleeves 170 of the adjacent truss splicing unit portions 100 can prevent the joints between the second limiting sleeve 180 and the first limiting sleeve 170 and the upper beam 110 and the lower beam 120 from breaking due to stress.

[0057] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. An assembled bridge double-layer combined steel truss structure, including a truss splicing unit part (100), the truss splicing unit part (100) includes an upper beam (110), a lower beam (120) and a web member assembly (130) arranged between the upper beam (110) and the lower beam (120), characterized in that, The upper beam (110) and the lower beam (120) are parallel to each other and in a set plane. Connecting rods (140) are connected between the two ends of the upper beam (110) and the lower beam (120). The connecting rods (140) are located in the set plane, and the two ends of the connecting rods (140) are respectively hinged to one end of the corresponding upper beam (110) and lower beam (120). The upper beam (110), the lower beam (120) and a pair of connecting rods (140) enclose an installation space for installing the web member assembly (130), and the cross-section of the installation space in the set plane is a parallelogram; The web member assembly (130) includes an upper arched rod (131), a lower arched rod (132) and a tension rod member (133). The two ends of the upper arched rod (131) are respectively hinged to the two ends of the upper beam (110), and the middle part of the upper arched rod (131) abuts against one side of the lower beam (120) relative to the upper beam (110). The two ends of the lower arched rod (132) are respectively hinged to the two ends of the lower beam (120), and the middle part of the lower arched rod (132) abuts against one side of the upper beam (110) relative to the lower beam (120). The tension rod member (133) is connected between the upper arched rod (131) and the lower arched rod (132).

2. The prefabricated bridge double-layer combined steel truss structure according to claim 1, characterized in that: The opposite sides of the upper beam (110) and the lower beam (120) are respectively an upper connection surface (111) and a lower connection surface (121). The hinge points at the two ends of the upper arched rod (131) are respectively located at two diagonal positions of the upper connection surface (111), and the middle part of the upper arched rod (131) abuts against the middle line of the width of the lower connection surface (121); The hinge points at the two ends of the lower arched rod (132) are respectively located at two diagonal positions of the lower connection surface (121), and the middle part of the lower arched rod (132) abuts against the middle line of the width of the upper connection surface (111). The plane where the upper arched rod (131) is located intersects with the plane of the lower arched rod (132).

3. The assembled bridge double-layer combined steel truss structure according to claim 2, characterized in that: The whole of the tension rod member (133) is in an N shape, and it includes a middle rod part (133a) and inclined rod parts (133b) connected to both ends of the middle rod part (133a). Among them, the two ends of the middle rod part (133a) are respectively hinged to the middle part of the upper arched rod (131) and the middle part of the lower arched rod (132), and the ends of the two inclined rod parts (133b) far from the middle rod part (133a) are respectively hinged to the upper arched rod (131) and the lower arched rod (132).

4. The assembled bridge double-layer combined steel truss structure according to claim 3, characterized in that: First hinge seats (150) are symmetrically arranged at both ends of the upper beam (110), second hinge seats (160) are symmetrically arranged at both ends of the lower beam (120), the two ends of the connecting rod (140) are respectively hinged to the corresponding first hinge seat (150) and second hinge seat (160), the two ends of the upper arched rod (131) are respectively hinged to a pair of first hinge seats (150), and the two ends of the lower arched rod (132) are respectively hinged to a pair of second hinge seats (160).

5. The prefabricated bridge double-layer combined steel truss structure according to claim 4, wherein: The first hinge seat (150) and the second hinge seat (160) are respectively slidably arranged on the upper beam (110) and the lower beam (120). Both ends of the upper beam (110) are fixedly provided with first limiting sleeves (170), and both ends of the lower beam (120) are fixedly provided with second limiting sleeves (180). The first hinge seat (150) abuts against the side surface of the corresponding first limiting sleeve (170), and the second hinge seat (160) abuts against the side surface of the corresponding second limiting sleeve (180).

6. The prefabricated bridge double-layer combined steel truss structure according to claim 5, wherein: Both ends of the upper beam (110) and the lower beam (120) with the same position are provided with clamping grooves (190), and both ends of the upper beam (110) and the lower beam (120) with the other same position are provided with clamping blocks (191) adapted to the clamping grooves (190). First bolt holes (192) are penetrated through the upper beam (110) and the lower beam (120) at the positions of the clamping grooves (190), and second bolt holes (193) corresponding to the first bolt holes (192) are penetrated through the clamping blocks (191).

7. The assembled bridge double-layer combined steel truss structure according to claim 6, characterized in that: Protrusions (200) corresponding to the clamping blocks (191) are arranged on the first limiting sleeves (170) and the second limiting sleeves (180) at one end of the clamping blocks (191). After the truss splicing unit part (100) is spliced, the protrusions (200) of the first limiting sleeves (170) abut against the side surfaces of the adjacent first limiting sleeves (170), and the protrusions (200) of the second limiting sleeves (180) abut against the side surfaces of the adjacent second limiting sleeves (180).

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