Prestressed concrete steel pipe truss structure

Abstract

The utility model provides a prestressed concrete steel pipe truss structure, which belongs to the field of steel pipe concrete trusses and comprises a prefabricated bridge floor, a plurality of steel pipe trusses and shaft seats. An embedded part is poured in the prefabricated bridge floor, a connecting kidney-shaped hole and a limiting round hole are formed in the embedded part, and the surface of the embedded part communicates with the limiting round hole through the connecting kidney-shaped hole; the two steel pipe trusses are rotationally arranged on the shaft seat, a penetrating hole is formed in the shaft seat, a connecting rod is rotationally arranged in the penetrating hole, a limiting rod is arranged at the first end of the connecting rod, the limiting rod is perpendicular to the connecting rod, the connecting rod is arranged in the penetrating hole in a penetrating mode, and the limiting rod abuts against the end face, close to the connecting kidney-shaped hole, of the limiting round hole. The bridge deck slab prefabrication and the lower structure of the bridge can be carried out at the same time, after the steel pipe trusses are installed on the shaft seats, the prefabricated bridge deck slabs can be installed one by one from the bridge head, only the prefabricated bridge deck slabs need to be fixedly connected with the steel pipe trusses in a hoisting mode, a large amount of space operation is avoided, and the construction efficiency is improved. The construction period of the bridge is shortened; the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel tube concrete truss technology, and more specifically, to a prestressed concrete steel tube truss structure. Background Technology

[0002] A truss is a frame composed of several members. It is used to span space and bear weight, and is widely used in building structures and bridge engineering. Compared to solid beams, it uses less material, is lighter, and can accommodate larger spans. It can be constructed from materials such as steel, wood, or reinforced concrete.

[0003] Currently, the construction of space steel-concrete composite truss beams both domestically and internationally generally involves first erecting the steel truss using methods such as dragging and segmented hoisting. Then, concrete is poured into the upper and lower chord steel pipes. Once the concrete inside the steel pipes reaches the design requirements, the steel truss serves as the support for the cast-in-place bridge deck formwork, which is then erected at a high position, and the bridge deck is poured on-site. Using this method, the formwork installation and concrete pouring are both completed in situ at high altitudes, resulting in a long construction period, significant construction difficulty, and difficulty in ensuring the quality of the bridge deck construction. This also poses significant risks to personnel safety and structural quality. Utility Model Content

[0004] The purpose of this utility model is to provide a prestressed concrete steel pipe truss structure, which can reduce construction difficulty, improve bridge deck construction quality, shorten construction period, and improve the safety of construction personnel.

[0005] The embodiments of this utility model are achieved through the following technical solution: a prestressed concrete steel pipe truss structure, including a precast bridge deck, multiple steel pipe trusses and axle seats;

[0006] The precast bridge deck has embedded parts pre-cast inside. The surface of the embedded parts protrudes from the surface of the precast bridge deck. The embedded parts have connecting waist-shaped holes and limiting circular holes inside. The connecting waist-shaped holes connect the surface of the embedded parts with the limiting circular holes. The length of the connecting waist-shaped holes is equal to the diameter of the limiting circular holes, and the central axis of the connecting waist-shaped holes along the height direction coincides with the axis of the limiting circular holes.

[0007] Both ends of the steel pipe trusses are rotatably mounted on the bearing seats. The bottom surface of the bearing seats abuts against the surface of the embedded parts. A through hole is provided on the bearing seats, and a connecting rod is rotatably mounted in the through hole. A limit rod is provided at the first end of the connecting rod. The limit rod is perpendicular to the connecting rod. The length of the limit rod is less than the length of the connecting waist-shaped hole and greater than the width of the connecting waist-shaped hole. The connecting rod passes through the through hole, and the limit rod abuts against the end face of the limit circular hole near the connecting waist-shaped hole.

[0008] Furthermore, the second end of the connecting rod is provided with a thread, and a connecting nut is fitted onto the second end of the connecting rod after passing through the through hole. The width of the connecting nut is the same as the width of the through hole.

[0009] Furthermore, the surface of the embedded part is provided with multiple connecting ribs, which are disposed inside the precast bridge deck.

[0010] Furthermore, the side of the steel pipe truss is provided with an adjustment groove, and an adjustment rod is provided between adjacent steel pipe trusses. The two ends of the adjustment rod are provided with connecting hooks, and the connecting hooks are hooked into the adjustment groove.

[0011] Furthermore, there are multiple adjustment slots, which are evenly distributed along the length of the steel pipe truss.

[0012] Furthermore, a fixing baffle is detachably provided on the side of the steel pipe truss, which closes the opening of the adjustment groove.

[0013] Furthermore, a fixing hole is provided at the end of the fixing baffle, and a protruding screw is provided on the side of the steel pipe truss. The protruding screw passes through the fixing hole, and a fixing nut is threaded onto the protruding screw. The fixing nut abuts against the side of the fixing baffle facing away from the steel pipe truss.

[0014] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0015] 1. This utility model allows for the simultaneous prefabrication of bridge deck panels and the bridge substructure. After the steel pipe truss is installed at the axle bearings, the prefabricated bridge deck panels can be installed piece by piece starting from the bridgehead. The process involves simply hoisting and fixing each prefabricated bridge deck panel to the steel pipe truss, avoiding extensive space-consuming work, significantly shortening the bridge construction period, reducing costs, ensuring personnel safety during construction, and improving project quality. If quality problems arise with the bridge deck panels during the bridge's service life, simply adding prestressing tendons and replacing the prefabricated bridge deck panels will suffice.

[0016] 2. This utility model sets multiple adjustment slots and adjustment rods on the steel pipe truss. The adjustment rods are hooked onto the adjustment slots at different positions in the steel pipe truss to limit the included angle between two adjacent steel pipe trusses, increase the overall stability of the steel pipe truss, and facilitate maintaining the overall connection state when hoisting the steel pipe truss. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the precast bridge deck in this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the embedded part in this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the central shaft seat of this utility model;

[0022] Figure 5 This is a schematic diagram of the steel pipe truss structure in this utility model.

[0023] Icons: 1. Precast bridge deck; 11. Embedded part; 12. Connecting bar; 13. Connecting slot; 14. Limiting hole; 2. Steel pipe truss; 21. Through slot; 22. Adjusting rod; 23. Connecting hook; 24. Adjusting groove; 25. Fixing baffle; 26. Mating hole; 27. Fixing hole; 28. Protruding screw; 29. ​​Fixing nut; 210. Hinge hole; 3. Shaft seat; 31. Through hole; 32. Connecting rod; 33. Limiting rod; 34. Connecting nut; 35. Middle plate; 36. Tension bolt; 37. Shaft hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Example

[0027] The following description, in conjunction with specific embodiments, provides further details. Figures 1-5 As shown, this utility model is a prestressed concrete steel pipe truss structure, referring to... Figure 1 The bridge consists of a precast bridge deck 1, multiple steel pipe trusses 2, and axle seats 3. The ends of two steel pipe trusses 2 are rotatably mounted on axle seat 3, which is detachably installed on the precast bridge deck 1, connecting the steel pipe trusses 2 to the precast bridge deck 1.

[0028] Reference Figure 2 and Figure 3 An embedded part 11 is pre-cast inside the precast bridge deck 1. One end face of the embedded part 11 is flush with the surface of the precast bridge deck 1. Multiple connecting ribs 12 are fixedly installed around the periphery of the embedded part 11 to increase the connection strength between the concrete and the embedded part 11 during the casting of the precast bridge deck 1. The embedded part 11 has a connecting waist-shaped hole 13 and a limiting circular hole 14 inside. The cross-sectional shape of the connecting waist-shaped hole 13 is elongated. The shape of the limiting circular hole 14 is cylindrical. The two ends of the connecting waist-shaped hole 13 connect the end face of the embedded part 11 and the top surface of the limiting circular hole 14, respectively. The length of the connecting waist-shaped hole 13 is equal to the diameter of the limiting circular hole 14, and the axis of the connecting waist-shaped hole 13 along the height direction is on the same straight line as the axis of the limiting circular hole 14.

[0029] Reference Figure 3 and Figure 4 The axle seat 3 is detachably installed on the precast bridge deck 1, and the bottom surface of the axle seat 3 abuts against the end face of the embedded part 11. A through hole 31 is provided through the interior of the axle seat 3, connecting the surface and bottom surface of the axle seat 3. In the direction perpendicular to the height of the through hole, the cross-sectional shape and size of the through hole 31 are the same as the shape and size of the connecting waist-shaped hole 13. When the axle seat 3 abuts against the embedded part 11, the through hole 31 is opposite to the connecting waist-shaped hole 13. A connecting rod 32 is rotatably inserted inside the through hole 31, and the length of the connecting rod 32 is greater than the sum of the thickness of the axle seat 3 and the height of the through hole 31. A limit rod 33 is provided at the first end of the connecting rod 32, and the midpoint of the connecting rod 32 and the limit rod 33 are connected, and the limit rod 33 is perpendicular to the connecting rod 32. The first end of the connecting rod 32 is used to move along the connecting waist-shaped hole 13, so that the limiting rod 33 moves to the position of the limiting round hole 14. The connecting rod 32 is rotated so that the length direction of the limiting rod 33 deviates from the length direction of the connecting waist-shaped hole 13, so that the limiting rod 33 abuts against the top surface of the limiting round hole 14. The limiting rod 33 is used to prevent the connecting rod 32 from disengaging from the embedded part 11.

[0030] Reference Figure 4The second end of the connecting rod 32 has a threaded circumference, and after passing through the through hole 31, the second end of the connecting rod 32 protrudes from the top surface of the bearing seat 3. A connecting nut 34 is rotatably mounted on the second end of the connecting rod 32. The width of the connecting nut 34 is greater than the width of the through hole 31, and the connecting nut 34 is used to abut against the top surface of the bearing seat 3.

[0031] Reference Figure 4 and Figure 5 A middle plate 35 is provided on the top surface of the bearing seat 3. A shaft hole 37 is opened on the surface of the middle plate 35, and a tension bolt 36 is inserted into the shaft hole 37. A hinge hole 210 is opened at the end of the steel pipe truss 2, and the hinge hole 210 is opposite to the shaft hole 37. The tension bolt 36 is sequentially inserted into the hinge hole 210 and the shaft hole 37 to rotatably connect the steel pipe truss 2 and the bearing seat 3.

[0032] Reference Figure 5 A through-hole groove 21 is provided inside the steel pipe truss 2 along its width. An adjusting rod 22 slides through the through-hole groove 21, with both ends of the adjusting rod 22 extending to two adjacent steel pipe trusses 2. Connecting hooks 23 are fixedly provided at both ends of the adjusting rod 22.

[0033] Reference Figure 5 Multiple adjustment slots 24 are provided on the side of the steel pipe truss 2, and the adjustment slots 24 are equidistantly distributed along the length of the steel pipe truss 2. Connecting hooks 23 are used to engage with the adjustment slots 24. The connecting hooks 23 are controlled to engage with the adjustment slots 24 at different positions in the steel pipe truss 2, and the included angle between two steel pipe trusses 2 on the same bearing 3 is fixed using adjusting rods 22, preventing the steel pipe truss 2 from rotating freely around the bearing 3.

[0034] Reference Figure 5 The steel pipe truss 2 has detachable fixed baffles 25 installed on both sides. The fixed baffles 25 are used to abut against the sides of the steel pipe truss 2 and to prevent the connecting hook 23 from disengaging from the groove of the adjusting groove 24.

[0035] Reference Figure 5 The fixed baffle 25 has a mating hole 26 at its center, which is oblong in shape. The mating hole 26 is opposite to the through-hole groove 21 so that the adjusting rod 22 can pass through the mating hole 26. A fixing hole 27 is provided at each end of the fixed baffle 25, and a protruding screw 28 is provided on the side of the steel pipe truss 2. When the fixed baffle 25 abuts against the side of the steel pipe truss 2, the protruding screw 28 is used to pass through the fixing hole 27, and a fixing nut 29 is threaded onto the protruding screw 28. The fixing nut 29 abuts against the side of the fixed baffle 25 facing away from the steel pipe truss 2.

[0036] The working process of this embodiment is as follows: During preparation, the bottom precast bridge deck 1 is first laid out, with the end face of the embedded part 11 in the bottom precast bridge deck 1 facing the top precast bridge deck 1. At other positions, the end of the steel pipe truss 2 is rotatably connected to the bearing 3, changing the straight-line distance between the adjusting rod 22 and the bearing 3. The connecting hook 23 at the end of the adjusting rod 22 is hooked with the adjusting groove 24 on two adjacent steel pipe trusses 2, used to adjust the included angle between the two adjacent steel pipe trusses 2, so that the distance between the two adjacent bearings 3 matches the distance between the embedded parts 11 in the precast bridge deck 1. Then, the fixing baffle 25 is fixedly connected to the side of the steel pipe truss 2, preventing the connecting hook 23 from disengaging from the steel pipe truss 2, thus forming the assembled steel pipe truss 2.

[0037] When installing the assembled steel pipe truss 2 onto the precast bridge deck 1, the assembled steel pipe truss 2 is hoisted to the top surface of the bottom precast bridge deck 1, so that the axle seat 3 abuts against the top surface of the embedded part 11 of the precast bridge deck 1, making the through hole 31 on the axle seat 3 align with the connecting waist-shaped hole 13. The connecting rod 32 is moved along the connecting waist-shaped hole 13, so that the limiting rod 33 moves into the limiting circular hole 14. The connecting rod 32 is rotated to change the direction of the limiting rod 33, so that the limiting rod 33 cannot disengage from the connecting waist-shaped hole 13. The connecting nut 34 is used to connect the connecting rod 32 to the axle seat 3, so that the axle seat 3 is fixedly connected to the embedded part 11 through the connecting rod 32, thus realizing the connection between the steel pipe truss 2 and the bottom precast bridge deck 1.

[0038] Then, the precast bridge deck 1 at the top position is hoisted to the top of the assembled steel pipe truss 2. The installation method is the same as above, and will not be repeated here.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A prestressed concrete steel pipe truss structure, characterized in that: It includes a precast bridge deck (1), multiple steel pipe trusses (2) and axle bearings (3); The precast bridge deck (1) has an embedded part (11) precast inside. The embedded part (11) has a connecting waist-shaped hole (13) and a limiting round hole (14) inside. The connecting waist-shaped hole (13) connects the surface of the embedded part (11) with the limiting round hole (14). The length of the connecting waist-shaped hole (13) is equal to the diameter of the limiting round hole (14), and the central axis of the connecting waist-shaped hole (13) along the height direction coincides with the axis of the limiting round hole (14). The ends of the two steel pipe trusses (2) are rotatably mounted on the bearing seat (3). The bottom surface of the bearing seat (3) abuts against the surface of the embedded part (11). A through hole (31) is provided on the bearing seat (3). A connecting rod (32) is rotatably mounted in the through hole (31). A limiting rod (33) is provided at the first end of the connecting rod (32). The limiting rod (33) is perpendicular to the connecting rod (32). The length of the limiting rod (33) is less than the length of the connecting waist-shaped hole (13), and the length of the limiting rod (33) is greater than the width of the connecting waist-shaped hole (13). The connecting rod (32) passes through the through hole (31). The limiting rod (33) abuts against the end face of the limiting round hole (14) near the connecting waist-shaped hole (13).

2. The prestressed concrete steel pipe truss structure according to claim 1, characterized in that: The second end of the connecting rod (32) is threaded, and the second end of the connecting rod (32) passes through the through hole (31) and is fitted with a connecting nut (34). The width of the connecting nut (34) is the same as the width of the through hole (31).

3. The prestressed concrete steel pipe truss structure according to claim 1, characterized in that: The surface of the embedded part (11) is provided with multiple connecting ribs (12), and the connecting ribs (12) are located inside the precast bridge deck (1).

4. The prestressed concrete steel pipe truss structure according to claim 1, characterized in that: The steel pipe truss (2) has an adjustment groove (24) on its side, and an adjustment rod (22) is provided between adjacent steel pipe trusses (2). The two ends of the adjustment rod (22) are provided with connecting hooks (23), and the connecting hooks (23) are hooked into the adjustment groove (24).

5. The prestressed concrete steel pipe truss structure according to claim 4, characterized in that: There are multiple adjustment slots (24), and the multiple adjustment slots (24) are evenly distributed along the length direction of the steel pipe truss (2).

6. The prestressed concrete steel pipe truss structure according to claim 4, characterized in that: The steel pipe truss (2) is detachably provided with a fixing baffle (25) on its side, which closes the opening of the adjustment groove (24).

7. The prestressed concrete steel pipe truss structure according to claim 6, characterized in that: The fixed baffle (25) has a fixed hole (27) at its end. The steel pipe truss (2) has a protruding screw (28) on its side. The protruding screw (28) passes through the fixed hole (27). A fixing nut (29) is threaded onto the protruding screw (28). The fixing nut (29) abuts against the side of the fixed baffle (25) facing away from the steel pipe truss (2).

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