CN113463496B - Self-balancing detachable truss bridge structure - Google Patents

Abstract

The invention discloses a self-balancing detachable truss bridge structure, belonging to the technical field of transportation, comprising multiple sets of brackets, multiple truss units, bridge decks and multiple sets of cable assemblies. The overall type and size of the present invention tend to be unified and standardized, industrialized prefabrication can be carried out, and the construction period is greatly shortened to a certain extent; the structure module is single, and can be split into separate frames, which can meet the requirements of rapid construction and disassembly, and fast splicing speed; Modular design is adopted, which can be increased or decreased according to needs, realizing the freedom of span; it combines the stress characteristics of truss structure and self-anchored suspension structure to form a self-balancing system, which does not require brackets and large machinery, and the engineering quality is easy to control. It has few sites and is not affected by seasons; at the same time, it has large equipment reserves, is suitable for manual assembly and erection, adapts to various spans, and is convenient for general vehicle transportation. It has the advantages of convenient erection and fast withdrawal.

Description

A self-balancing detachable truss bridge structure

technical field

The invention relates to the technical field of transportation, in particular to a self-balancing detachable truss bridge structure.

Background technique

A bridge generally refers to a structure erected on rivers, lakes and seas to enable vehicles and pedestrians to pass smoothly. In order to adapt to the modern and fast-developing transportation industry, bridges are also extended to bridges over mountain streams, unfavorable geology or other traffic needs to be erected to make traffic more convenient. Bridges are generally composed of superstructure, substructure, supports and auxiliary structures. The superstructure, also known as bridge span structure, is the main structure for crossing obstacles; the substructure includes abutments, piers and foundations; supports are span structures and piers. Or the force transmission device installed in the support space of the bridge abutment; the auxiliary structures refer to the bridge head slab, conical slope protection, bank protection, diversion works, etc.

When a disaster occurs, how to get rescue personnel and materials to the affected area in time is an urgent problem that needs to be solved. At the same time, there is also the problem of inconvenient transportation during wartime that military supplies cannot be supplied to combat soldiers in time. Emergency bridges at home and abroad are moving towards lightweight, With the development of large-span, modularization and intelligentization, the existing temporary bridges in our country have small spans and need to set up more temporary piers and large-scale hoisting equipment. The construction period is long and the economy is poor. To this end, a self-balancing detachable truss bridge structure is proposed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: how to solve the problems of the existing temporary bridges, such as the small span, the need to set up more temporary piers and large-scale hoisting equipment, the long construction period, and the poor economy, and provide a self-balancing detachable truss Bridge structure, this structure has strong span adaptability, fast splicing speed and short construction period.

The present invention solves the above-mentioned technical problems through the following technical solutions. The present invention includes multiple sets of brackets, multiple truss units, bridge decks, and multiple sets of stay cable assemblies. A plurality of the truss units are detachably connected in sequence, and the brackets are connected to all the truss units. The number of the stay cable assemblies is the same, a plurality of groups of the brackets are symmetrically arranged on the two outermost truss units, the bridge deck includes a plurality of steel plates laid on the bottom of each truss unit, and the stay cable assemblies One end is connected with the upper end of the outermost truss unit, and the other end is arranged along the bracket and connected with the lower end of the outermost truss unit.

Further, the truss unit includes a plurality of channel steels, a plurality of steel columns, and four cross web bars, the plurality of the steel columns form a square frame, and the channel steels are respectively arranged at the four corners of the square frame, and four The cross web bars are respectively arranged around the square frame.

Further, the channel steels of the two adjacent truss units located on the outer side are detachably connected.

Further, the two channel steels on either side of the two truss units in the middle are provided with C-shaped steel, the C-shaped steel and the side channel steel are integrally formed, and the other side channel corresponding to this side is provided. The steel is detachably connected to the C-shaped steel.

Further, each group of the brackets includes an upper inclined-stayed bracket, a bottom straight-pulled bracket, and an extension rod. It is rotatably connected with the upper end of the outer channel steel of the outermost truss unit, the other end is rotatably connected with the outer end of the extension rod, one end of the bottom straight pull bracket is rotatably connected with the bottom of the outermost truss unit, and the other end is rotatably connected with the extension rod The outer end turns the connection.

Further, the upper inclined-stayed support includes a triple pipe, two rotating parts, and three straight pipes, the triple pipe includes three connecting pipes connected together, and the three connecting pipes are respectively connected to the most The upper end of the outer channel steel of the outer truss unit is rotatably connected with the inner end of the extension rod, and is rotatably connected with the outer end of the extension rod; the bottom straight-pull bracket includes a triple pipe, two rotating parts, and three straight pipes. The three straight pipes are respectively connected in rotation with the lower end of the outermost truss unit, with the lower end of the outer channel steel of the outermost truss unit, and with the outer end of the extension rod.

Further, the rotating part includes a groove provided on the channel steel, an insertion hole arranged on the straight pipe, and a through hole matching the insertion hole is arranged on the groove, The groove and the straight pipe are hinged through the plug-in piece passing through the through hole and the insertion hole.

Further, the cable assembly is a steel strand, and the steel strand passes through the two triple pipes in sequence, and the two ends are respectively connected to the upper end and the lower end of the outermost truss unit.

Compared with the prior art, the present invention has the following advantages: the self-balancing detachable truss bridge structure tends to be unified and standardized in overall type and size, can carry out industrialized prefabrication production, and greatly shorten the construction period to a certain extent; the structural module is single , it can be split into separate frames to meet the needs of rapid construction and disassembly, and the splicing speed is fast; the modular design can be increased or decreased according to needs, and the span is free; It forms a self-balancing system, does not require supports and large-scale machinery, the project quality is easy to control, occupies less space, and is not affected by seasons; at the same time, it has large equipment reserves, is suitable for manual assembly and erection, adapts to various spans, and is convenient for general-purpose vehicle transportation. The advantages of fast collection speed are worthy of promotion.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the bridge in the second embodiment of the present invention;

2 is a schematic structural diagram of a truss unit in Embodiment 2 of the present invention;

Fig. 3 is the structural schematic diagram of the channel steel, the cross web rod and the steel column in the truss unit according to the second embodiment of the present invention;

4 is a schematic structural diagram of a bridge deck in Embodiment 2 of the present invention;

5 is a schematic structural diagram of a bridge deck steel plate in Embodiment 2 of the present invention;

6 is a schematic diagram of the setting position of the cable assembly in the second embodiment of the present invention;

7 is a schematic diagram of the tensile force of the steel strand in the second embodiment of the present invention;

8 is a schematic diagram of the self-weight force of the bridge in the second embodiment of the present invention;

9 is a schematic diagram of the balance between tension and self-weight in Embodiment 2 of the present invention;

10 is a schematic structural diagram of a stent in Embodiment 2 of the present invention;

11a is a schematic structural diagram of a triple tube in a stent in Embodiment 2 of the present invention;

Figure 11b is a schematic structural diagram of the rotating part in the bracket in the second embodiment of the present invention;

Fig. 12a is a schematic diagram of the first type of detachable connection between truss units in the second embodiment of the present invention;

12b is a schematic diagram of the second type of detachable connection between truss units in the second embodiment of the present invention;

FIG. 13 is a schematic diagram of the MIDAS model in Embodiment 2 of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following implementation. example.

Example 1

This embodiment provides a technical solution: a self-balancing detachable truss bridge structure, including multiple sets of brackets, multiple truss units, bridge decks, and multiple sets of cable assemblies, and multiple truss units are detachably connected in sequence, so The number of the brackets is the same as that of the cable assemblies, and multiple groups of the brackets are symmetrically arranged on the two outermost truss units. The bridge deck includes a plurality of steel plates laid on the bottom of each truss unit. One end of the cable assembly is connected with the upper end of the outermost truss unit, and the other end is arranged along the bracket and connected with the lower end of the outermost truss unit.

In this embodiment, the truss unit includes a plurality of channel steels, a plurality of steel columns, and four cross web bars, the plurality of the steel columns form a square frame, and the channel steels are respectively arranged at the four corners of the square frame, The four cross web bars are respectively arranged around the square frame.

In this embodiment, the channel steels of two adjacent truss units located on the outside are detachably connected.

In this embodiment, a C-shaped steel is provided on either side channel steel of the two truss units located in the middle, the C-shaped steel and the side channel steel are integrally formed, and the other side channel steel corresponding to this side is formed. Detachable connection with the C-shaped steel.

In this embodiment, each group of the brackets includes an upper inclined-stayed bracket, a bottom straight-pulled bracket, and an extension rod, the extension rod is extended outward from the lower end of the outer channel steel of the outermost truss unit, and the upper inclined-stayed bracket One end is rotatably connected with the upper end of the outer channel steel of the outermost truss unit, the other end is rotatably connected with the outer end of the extension rod, one end of the bottom straight pull bracket is rotatably connected with the bottom of the outermost truss unit, and the other end is rotatably connected with the The outer end of the extension rod is connected in rotation.

In this embodiment, the upper inclined-stayed support includes a triple pipe, two rotating parts, and three straight pipes. The triple pipe includes three connecting pipes connected together, and the three connecting pipes are respectively connected by three straight pipes. It is rotatably connected with the upper end of the outer channel steel of the outermost truss unit, is connected with the inner end of the extension rod, and is rotatably connected with the outer end of the extension rod; the bottom straight-pull bracket includes a triple tube, two rotating parts, and three straight tubes. The triple pipe is respectively rotatably connected with the lower end of the outermost truss unit, connected with the lower end of the outer channel steel of the outermost truss unit, and rotatably connected with the outer end of the extension rod through three straight pipes.

In this embodiment, the rotating part includes a groove set on the channel steel and an insertion hole set on the straight pipe, and the groove is provided with a through hole matching the insertion hole. The groove and the straight pipe are hinged through the inserts passing through the through hole and the insertion hole.

In this embodiment, the cable assembly is a steel strand, and the steel strand passes through the two triple pipes in sequence, and the two ends are respectively connected to the upper end and the lower end of the outermost truss unit.

Embodiment 2

This embodiment provides a self-balancing detachable truss bridge structure, the specific content is as follows:

1. Basic properties of bridges:

(1) Bridge span and bridge width

Unit: The steel bridge is designed with 6 truss units with lengths of 5m, 4.5m, 4m, 4.5m and 5m;

The whole bridge is 40m long, the steel bridge is 30m long, and the piers at both ends are 5m long;

The bridge deck is 7m wide, divided into two lanes, each lane is 3.5m wide.

(2) Bridge main structure

The main structure of the bridge includes a plurality of assembled truss units 1, four groups of brackets 3, a bridge deck 2 and four groups of cable assemblies. The overall structure of the bridge is shown in Figure 1.

(3) Bridge material design

Each unit uses Q420 steel, and the specific physical properties of the steel are as follows:

Table 1 Physical Properties Table

2. The basic frame of the bridge

(1) As shown in Figure 2, it is a schematic diagram of the structure of the assembled truss unit. The main body includes two parts: channel steel 11 and steel column 13. The truss structure is supported by cross web rods 12 on four sides. A schematic diagram of the structure of the web rod 12 is shown in FIG. 3 .

There are two types of cross webs 12, the first is the bottom cross webs arranged on the bottom surface of the truss structure, the top cross webs provided on the top of the truss structure, and the second is the side cross webs provided on both sides of the truss structure. rod.

It should be noted that, in an assembled truss unit, the number of channel steels 11 is four groups, and the front and rear ends of the frame formed by the steel columns 13 are symmetrically arranged two by two, which are used to connect with the channel steels 11 in the adjacent assembled truss unit. or bracket 3 connection.

(2) As shown in Figure 4, it is a schematic diagram of the partial structure of the bridge deck. According to the size of the frame, 19, 17, and 15 steel plates are laid on the bridge deck in the frame. The steel plate structure is shown in Figure 5.

In this embodiment, a steel plate of 7.5m×0.05m as shown in FIG. 5 is used for the inner deck of the fabricated truss.

(3) As shown in Figure 6, the dark lines on the brackets at both ends represent the cable components of the bridge, using high-strength steel strands with a diameter of 80mm. One end of the cable assembly is connected with the upper end of the outermost truss unit, and the other end is arranged along the bracket 3 and connected with the lower end of the outermost truss unit.

The structural innovation of the bridge of this embodiment is that the bridge itself can reach a self-equilibrium state. In the cable assembly, a high-strength steel strand with a diameter of 80mm is used. The specific connection method is shown in the arrow part in Figure 7. The setting of the cable assembly enables the high-strength steel strands pre-installed inside the support on both sides to form a top-down tension along the truss from the upper chord to the lower chord of the truss; at the same time, due to the self-weight of the bridge, as shown by the arrow in Figure 8 Shown is the self-weight force part of the bridge, which causes the upper part of the bridge to be compressed and the lower part to be pulled. The tension generated by the high-strength steel strands inside the bridge member and the gravity generated by the bridge itself form a state of balance, as shown in Figure 9.

(4) At the connection between the truss unit and the bracket, the protruding end of the outer channel steel 11 of the outermost truss unit 1 is hollow, and the channel steel 11 and the straight pipe 33 are fixed and hinged with screws and nuts (that is, the rotating part 32 ); the use diagram of the three straight pipes 33 The structure shown in node structure 2 is connected by high-strength rigid stranded wires, as shown in Figure 10.

Each set of brackets 3 includes an upper inclined-stayed bracket, a bottom straight-pulled bracket, and an extension rod 34 . The upper inclined-stayed bracket includes a triple tube 31 , two rotating parts 32 , three straight tubes 33 , and two of the extension rods 34 . The lower end of the outer channel steel 11 of the outermost truss unit 1 extends outward, and the triple pipe 31 includes three connecting pipes connected together. 11. The upper end is rotatably connected, connected with the inner end of the extension rod 34, and is rotatably connected with the outer end of the extension rod 34; The tube 31 is rotatably connected to the lower end of the inner channel steel 11 of the outermost truss unit 1, connected to the lower end of the outer channel steel 11 of the outermost truss unit 1, and rotatably connected to the outer end of the extension rod 34 through three straight tubes 33.

The steel strand penetrates the inside of the steel pipe of the triple pipe 31, and connects the components at both ends to form a cable. The specific structure of the triple pipe 31 is shown in Figure 11a, and the specific structure of the rotating part 32 is shown in Figure 11b.

(5) At the same time, innovation is achieved at the truss connection point. At the connection between the truss unit 1 and the bracket 3, the protruding end of the channel steel 11 is hollow, and the channel steel 11 and the straight pipe 33 are fixed and hinged with screws and nuts, so that the bridge can be disassembled; the outer truss At the connection of the unit 11, the channel steel 11 and the channel steel 11 are connected by screws and nuts, as shown in Figure 12a; at the connection of the two truss units 11 in the middle, the screws and nuts connect the channel steel with the C-shaped steel tenon and mortise. This connection design , realizing the detachment of the bridge, as shown in Fig. 12b.

This embodiment verifies and optimizes the above design ideas, and the specific contents are as follows:

1. MIDAS model establishment

The design model of this embodiment has a total of 266 elements and 85 nodes; there are 12 supports and 20 elastic connections in the boundary conditions. The model is shown in Figure 13.

The design of this embodiment gives the bridge a load of 4 tons per square meter, the size of each bridge deck unit is 5mx5m, 4.5mx4.5m, 4mx4m, and the smallest plate unit can also bear the weight of 64 tons. It is understood that the weight of the armored vehicle is about 20 to 30 tons, and the bridge can be quickly established to allow the armored vehicle to pass through during combat readiness. After software analysis, it can be seen that the deformation is dominated by the longitudinal and vertical bending of the main bridge structure, as shown in Table 2.

Analysis and comparison of the deformation legend shows that the displacement peak is 23.84m. According to the service deflection value of the bridge, the allowable deflection value of the steel frame bridge is 40000x1/1000=40mm, which preliminarily meets the design requirements. According to the above analysis and verification, the basic steel frame bridge established meets the design requirements, but there is still room for optimization.

2. Optimized design

In the design and exploration process of this embodiment, the cross-sectional dimensions of the channel steel 11, the steel column 13, the bottom cross web rod, the side cross web rod and the stay cable are all explored, designed and optimized. By comparing the data in Table 2 and Table 3, it can be seen that the peak displacement of the initial model is 76.83mm, the current peak displacement is 23.84mm, and the peak displacement after optimization is reduced by 68.97%. In the future, continuous optimization will be carried out in terms of detailed design of truss elements, re-optimization of component parameters, and re-optimization of connection design to continuously improve bridge design.

Table 2 Partial node displacement data table before optimization

Table 3 Partial node displacement data table after optimization

node load DX(mm) DY(mm) DZ(mm) RX(rad]) RY(rad]) RZ(rad]) 61 1 -0.000796 0.00043 -23.841486 -0.000194 0.000001 0 19 1 -0.0007971 0.000493 -23.841132 -0.000194 0.000001 0 80 1 0.000979 0.493882 -23.787384 -0.000158 0.000002 0 32 1 0.000984 0.493915 -23.786936 -0.000158 0.000002 0 69 1 -0.37452 0 -23.402002 0 0 0 25 1 0.374357 0 23.394015 0 0 0 79 1 -0.992127 0.532963 -22.718635 -0.000117 -0.004571 -0.000007 31 1 0.993529 0.534663 -22.70288 -0.000115 0.0045731 0.000007 16 1 0.00012 0.026286 -22.447531 -0.000128 -0.000001 0 59 1 0.000122 0.026236 -22.447261 -0.000128 -0.000001 0 29 1 -0.000929 0.363594 -22.398411 -0.000147 -0.000001 0 78 1 -0.000934 0.363548 -22.39813 -0.000147 -0.000001 0 57 1 0.056587 0.01056 -22.210014 -0.000148 -0.001708 0.00005 18 1 -0.058039 0.009809 -22.195324 -0.000144 0.001713 -0.000051 twenty two 1 0.278075 0 -22.050288 0 0 0 67 1 -0.27877 0 -22.044912 0 0 0 56 1 0.483539 -0.01381 -21.78306 -0.000148 -0.001708 0.00005 14 1 -0.486391 -0.0134971 -21.766972 -0.000144 0.001713 -0.000051 77 1 -2.13497 0.560525 -21.575796 -0.000117 -0.004571 -0.000007 37 1 2.136667 0.561763 -21.559746 -0.000115 0.004573 0.000007 28 1 1.045523 0.290285 -21.163551 -0.000152 0.003247 -0.000022 74 1 0.046971 0.288644 -21.153255 -0.000153 -0.003248 0.000022 15 1 -0.091249 0.036307 -21.053837 -0.000095 0.0015541 0.000038 58 1 0.091382 0.037036 -21.043706 -0.000098 -0.001557 -0.000039 11 1 -0.479818 0.003001 -20.665267 -0.000095 0.001554 0.000038 54 1 0.4806 0.002836 -20.654487 -0.000098 -0.001557 -0.000039 34 1 1.857213 0.333905 -20.351866 -0.000152 0.003247 -0.000022 73 1 858928 0.332498 -20.341303 -0.000153 -0.003248 0.000022

To sum up, the self-balancing detachable truss bridge structure of the above-mentioned embodiment tends to be unified and standardized in overall type and size, and can be industrially prefabricated, which greatly shortens the construction period to a certain extent; the structural module is single and can be dismantled. It is divided into a separate frame, which can meet the fast construction and disassembly, and the splicing speed is fast; the modular design can be increased or decreased according to the needs, and the span freedom is realized; the force characteristics of the truss structure and the self-anchored suspension structure are combined to form a self-balancing The system does not need brackets and large machinery, the engineering quality is easy to control, occupies less space, and is not affected by seasons; at the same time, it has large equipment reserves, is suitable for manual assembly and erection, adapts to various spans, and is convenient for general-purpose vehicle transportation. The advantages are worthy of being promoted and used.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (4)

1. A self-balancing detachable truss bridge structure is characterized in that: comprising multiple groups of supports, multiple truss units, bridge decks, and multiple groups of cable assemblies, a plurality of the truss units are sequentially detachably connected, and the supports are connected with The number of the cable assemblies is the same, and multiple groups of the brackets are symmetrically arranged on the two outermost truss units, and are detachably connected to the outermost truss units. A plurality of steel plates at the bottom of the truss unit, one end of the cable assembly is connected to the upper end of the outermost truss unit, and the other end is arranged along the bracket and connected to the lower end of the outermost truss unit; The truss unit includes a plurality of channel steels, a plurality of steel columns, and four cross web bars, the plurality of the steel columns form a square frame, the channel steels are respectively arranged at the four corners of the square frame, and the four cross web bars are respectively arranged. The rods are respectively arranged around the square frame; Each group of the brackets includes an upper inclined-stayed bracket, a bottom straight-pulled bracket, and an extension rod. The extension rod extends outward from the lower end of the outer channel steel of the outermost truss unit, and one end of the upper inclined-stayed bracket is connected to the outermost truss. The upper end of the outer channel steel of the unit is rotatably connected, the other end is rotatably connected with the outer end of the extension rod, one end of the bottom straight-pull bracket is rotatably connected with the bottom of the outermost truss unit, and the other end is rotatably connected with the outer end of the extension rod ; The upper inclined-stayed support includes a triple pipe, two rotating parts, and three straight pipes. The triple pipe includes three connecting pipes connected together, and the three connecting pipes are respectively connected with the outermost truss unit through the three straight pipes. The upper end of the outer channel steel is rotatably connected to the inner end of the extension rod, and is rotatably connected to the outer end of the extension rod; the bottom straight-pull bracket includes a triple pipe, two rotating parts, and three straight pipes, and the triple pipe passes through the three straight pipes. They are respectively connected in rotation with the lower end of the outermost truss unit, connected with the lower end of the outer channel steel of the outermost truss unit, and connected in rotation with the outer end of the extension rod; The cable assembly is a steel strand, the steel strand passes through the two triple pipes in sequence, and the two ends are respectively connected with the upper end and the lower end of the outermost truss unit. 2 . The self-balancing detachable truss bridge structure according to claim 1 , wherein the channel steels of two adjacent truss units located on the outside are detachably connected. 3 . 3. A self-balancing detachable truss bridge structure according to claim 1, characterized in that: C-shaped steels are provided on the two channel steels on either side of the two middle truss units, so The C-shaped steel and the side channel steel are integrally formed, and the other side channel steel corresponding to the side is detachably connected to the C-shaped steel. 4 . The self-balancing detachable truss bridge structure according to claim 1 , wherein the rotating part comprises a groove arranged on the channel steel and an insertion hole arranged on the straight pipe, 5 . The groove is provided with a through hole matching the insertion hole, and the groove and the straight pipe are hinged through the plug piece passing through the through hole and the insertion hole.

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