A steel trestle bridge and its construction method

Abstract

This application relates to a steel trestle bridge and its construction method, belonging to the field of bridge construction. The steel trestle bridge includes: pile foundations; a Bailey bridge frame fixed to the upper side of the pile foundations; a bridge deck fixed to the upper side of the Bailey bridge frame; two guardrails, each hinged to one side of the bridge deck; and a drive mechanism located on the lower side of the bridge deck to drive the guardrails to stand vertically on both sides of the bridge deck or to lie flat on both sides of the bridge deck. This application facilitates the passing of two vehicles traveling in opposite directions, improving traffic efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction, in particular to a steel trestle and a construction method. BACKGROUND

[0002] In the process of bridge foundation construction in water, a steel trestle is usually set up to connect the two banks and form a water operation channel for material transportation and construction equipment passing. The steel trestle is usually composed of a pile foundation, a skeleton composed of a Bailey piece, a bridge deck plate laid on the top, and a guardrail on both sides of the bridge deck plate.

[0003] In the related art, the steel trestle is usually a single lane, and a passing point is arranged at intervals in the length direction of the steel trestle for two vehicles driving in opposite directions to pass through by turning side by side.

[0004] According to the related art in the above, the inventors believe that the two vehicles driving in opposite directions must reach the passing point to pass through by turning side by side, which is complicated to operate and low in passing efficiency, and there is still room for improvement. SUMMARY

[0005] In order to facilitate the meeting of two vehicles driving in opposite directions and improve the passing efficiency, the present application provides a steel trestle and a construction method.

[0006] In a first aspect, the present application provides a steel trestle, which adopts the following technical solution:

[0007] A steel trestle, comprising:

[0008] a pile foundation;

[0009] a Bailey piece skeleton fixed to the upper side of the pile foundation;

[0010] a bridge deck plate fixed to the upper side of the Bailey piece skeleton;

[0011] two guardrails, both of which are hinged to both sides of the bridge deck plate; and

[0012] a driving mechanism arranged on the lower side of the bridge deck plate to drive the guardrails to stand vertically on both sides of the bridge deck plate or to flatten on both sides of the bridge deck plate.

[0013] By adopting the above technical solution, when two vehicles driving in opposite directions meet, the driving mechanism drives the two guardrails to change from standing vertically on both sides of the bridge deck plate to flattening on both sides of the bridge deck plate to widen the width of the bridge deck plate, facilitating the meeting and passing through by turning side by side of the two vehicles driving in opposite directions without the need to drive to the meeting point for meeting, which is convenient to operate and improves the passing efficiency of the vehicles on the single lane steel trestle.

[0014] Optionally, the driving mechanism comprises:

[0015] a first hinge post, one end of which is hinged to one side of the guardrail away from the bridge deck;

[0016] a first screw post, which is connected to the slide of the sheet pile skeleton in the horizontal direction, the axis of the first screw post being perpendicular to the length direction of the bridge deck, one end of the first screw post being hinged to the other end of the first hinge post;

[0017] a second hinge post, one end of which is hinged to the other side of the guardrail away from the bridge deck;

[0018] a second screw post, which is connected to the slide of the sheet pile skeleton in the horizontal direction, the axis of the second screw post being perpendicular to the length direction of the bridge deck, one end of the second screw post being hinged to the other end of the second hinge post, the thread direction of the second screw post being opposite to that of the first screw post;

[0019] an adjusting cylinder, which is threadedly connected to the first screw post and the second screw post, the adjusting cylinder being stationary in the axial direction relative to the sheet pile skeleton, the adjusting cylinder being rotatable in the circumferential direction relative to the sheet pile skeleton to drive the first screw post and the second screw post to approach or move away from each other; and

[0020] a power source, which is arranged on the sheet pile skeleton to drive the adjusting cylinder to rotate.

[0021] By adopting the above technical solution, when two vehicles driving in opposite directions meet, the power source drives the adjusting cylinder to rotate, the adjusting cylinder drives the first screw post and the second screw post to approach each other, so as to drive the two guardrails to change from being vertically erected on both sides of the bridge deck to being flat on both sides of the bridge deck, thereby widening the width of the bridge deck, facilitating the two vehicles driving in opposite directions to meet and pass through side by side, which is convenient to operate and improves the passing efficiency of vehicles on the single-lane steel trestle.

[0022] Optionally, the sheet pile skeleton is provided with limiting plates, the limiting plates being fixed relative to the sheet pile skeleton, the two limiting plates corresponding to the adjusting cylinder, the two limiting plates abutting the two ends of the adjusting cylinder respectively, and the adjusting cylinder being rotatably connected to the two limiting plates.

[0023] By adopting the above technical solution, the two limiting plates limit the adjusting cylinder, so that the adjusting cylinder is stationary in the axial direction relative to the sheet pile skeleton, and the adjusting cylinder is rotatably connected to the limiting plates in the circumferential direction to drive the first screw post and the second screw post to approach or move away from each other.

[0024] Optionally, the first support cylinder and the second support cylinder are arranged on the bearing frame, and the first support cylinder and the second support cylinder are fixed relative to the bearing frame; the first support cylinder is sleeved on the first stud and is in axial sliding connection with the first stud; and the second support cylinder is sleeved on the second stud and is in axial sliding connection with the second stud.

[0025] By adopting the above technical scheme, the first support cylinder guides the first stud to slide in the horizontal direction, the second support cylinder guides the second stud to slide in the horizontal direction, the first support cylinder shares the pressure applied by the first hinge column to the first stud, and the second support cylinder shares the pressure applied by the second hinge column to the second stud, so that the first stud and the second stud are not easily damaged.

[0026] Optionally, the side, away from the adjusting cylinder, of the first support cylinder is provided with a first extension cylinder, the first extension cylinder is arranged on the first support cylinder and is in sliding connection with the first support cylinder, the first extension cylinder is fixedly connected with the end, away from the adjusting cylinder, of the first stud, and the first extension cylinder has a first insertion slot for the first hinge column to be inserted.

[0027] By adopting the above technical scheme, the first support cylinder provides support for the first extension cylinder, the first extension cylinder provides support for the first stud while sliding with the first stud, and shares the support pressure applied by the first hinge column to the first stud, so that the first stud is not easily damaged.

[0028] Optionally, the end of the first hinge column, toward the first stud, is fixedly provided with a first support block, and when the guardrail is vertically erected on both sides of the bridge deck, the first support block is pressed against the upper side of the first support cylinder.

[0029] By adopting the above technical scheme, when the guardrail is vertically erected on both sides of the bridge deck, the first support cylinder provides support for the first hinge column through the first support block, and shares the support pressure applied by the first hinge column to the first stud, so that the first stud is not easily damaged.

[0030] Optionally, the side, away from the adjusting cylinder, of the second support cylinder is provided with a second extension cylinder, the second extension cylinder is arranged on the second support cylinder and is in sliding connection with the second support cylinder, the second extension cylinder is fixedly connected with the end, away from the adjusting cylinder, of the second stud, and the second extension cylinder has a second insertion slot for the second hinge column to be inserted.

[0031] By adopting the above technical scheme, the second support cylinder provides support for the second extension cylinder, the second extension cylinder provides support for the second stud while sliding with the second stud, and shares the support pressure applied by the second hinge column to the second stud, so that the second stud is not easily damaged.

[0032] Optionally, there are two adjusting cylinders, which are respectively fitted onto the first stud and the second stud, and are arranged side by side, rotating synchronously.

[0033] By adopting the above technical solution, compared to using a single adjusting cylinder to drive the first and second studs closer or further apart, using two adjusting cylinders to drive the first and second studs closer or further apart results in a larger adjustment stroke for the same adjusting cylinder length. Furthermore, with the same adjustment stroke, using two adjusting cylinders results in a shorter adjusting cylinder length compared to using a single adjusting cylinder, thus reducing the space occupied by the adjusting cylinders.

[0034] Optionally, hinge tubes are fixed on both sides of the bridge deck, and a hinge sleeve is fixed on the lower side of the guardrail. The hinge sleeve is fitted onto the hinge tube and can rotate around the axis of the hinge tube.

[0035] By adopting the above technical solution, the two guardrails are respectively hinged to both sides of the bridge deck, so that the guardrails can rotate around the hinge tube to change from being vertically standing on both sides of the bridge deck to being flat on both sides of the bridge deck.

[0036] Secondly, this application provides a construction method for a steel trestle bridge, which adopts the following technical solution:

[0037] The construction method for the steel trestle bridge as described above includes the following steps:

[0038] S1. Drive and fix the pile foundation to the riverbed;

[0039] S2. Fix the Bailey panel frame to the upper side of the pile foundation;

[0040] S3. Fix the bridge deck to the upper side of the Bailey panel frame;

[0041] S4. Hinged the guardrails onto both sides of the bridge deck;

[0042] S5. Install the drive mechanism on the underside of the bridge deck and control the drive mechanism to adjust the guardrails to stand vertically on both sides of the bridge deck.

[0043] In summary, this application includes at least one of the following beneficial technical effects:

[0044] 1. When two vehicles traveling in opposite directions meet, the drive mechanism causes the two guardrails to change from being vertically erected on both sides of the bridge deck to being flattened on both sides of the bridge deck, thereby widening the width of the bridge deck. This makes it easier for two vehicles traveling in opposite directions to meet and pass each other without having to drive to the meeting point. This operation is convenient and improves the traffic efficiency of vehicles on the single-lane steel trestle bridge. Attached Figure Description

[0045] Figure 1 This is a structural schematic diagram of a steel trestle bridge according to Embodiment 1 of this application.

[0046] Figure 2 yes Figure 1 View from A in the middle.

[0047] Figure 3 This is an exploded view of the bridge deck, hinged pipe, and guardrail of Embodiment 1 of this application.

[0048] Figure 4 This is a schematic diagram of the drive mechanism of Embodiment 1 of this application.

[0049] Figure 5 This is an exploded view of the first extension cylinder, the first stud, and the first hinge post of Embodiment 1 of this application.

[0050] Figure 6 This is a schematic diagram of the structure of the guardrail in Embodiment 1 of this application when it is unfolded on both sides of the bridge deck.

[0051] Explanation of reference numerals in the attached drawings: 10, pile foundation; 11, crossbeam; 20, Bailey bridge frame; 21, limiting plate; 22, first support cylinder; 23, second support cylinder; 24, first extension cylinder; 241, first insertion slot; 242, through hole; 25, second extension cylinder; 251, second insertion slot; 26, I-beam; 30, bridge deck; 31, articulated pipe; 32, fixed column; 40, guardrail; 41, articulated sleeve; 50, drive mechanism; 51, first articulated column; 511, first support block; 512, articulated shaft; 52, first stud; 53, second articulated column; 54, second stud; 55, adjusting cylinder; 56, power source. Detailed Implementation

[0052] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0053] Example 1

[0054] Reference Figure 1 and Figure 2 This application discloses a steel trestle bridge. The steel trestle bridge includes pile foundations 10, Bailey bridge frame 20, bridge deck 30, guardrails 40, and drive mechanism 50.

[0055] The pile foundation 10 is inserted and fixed on the riverbed, two pile foundations 10 are a group, and multiple groups of pile foundations 10 are arranged at intervals along the length direction of the steel trestle, and the upper sides of the two pile foundations 10 of the same group are welded and fixed with a cross beam 11. The bailey frame 20 is fixed on the upper side of the multiple cross beams 11, and the length direction of the bailey frame 20 is perpendicular to the length direction of the cross beam 11. Multiple I-beams 26 are fixed on the upper side of the bailey frame 20, and the multiple I-beams 26 are arranged at intervals along the length direction of the steel trestle. The bridge deck slab 30 is fixed on the upper side of the I-beam 26, and the length direction of the bridge deck slab 30 is perpendicular to the length direction of the I-beam 26, and the two ends of the I-beam 26 extend out of the two sides of the bridge deck slab 30.

[0056] Referring to Figure 2 With Figure 3 , the guardrails 40 are two in number, and the two guardrails 40 are respectively hinged to the two sides of the bridge deck slab 30. Specifically, the two sides of the bridge deck slab 30 are each provided with a hinge pipe 31, the axis of the hinge pipe 31 is parallel to the length direction of the bridge deck slab 30, a plurality of fixed columns 32 are fixed on the outer side wall of the hinge pipe 31, the plurality of fixed columns 32 are arranged at intervals along the axial direction of the hinge pipe 31, and the end of the fixed column 32 away from the hinge pipe 31 is fixed with the bridge deck slab 30, so as to fix the two hinge pipes 31 on the two sides of the bridge deck slab 30 respectively. The lower side of the guardrail 40 is fixed with a plurality of hinge sleeves 41, the hinge sleeve 41 is sleeved on the outer side of the hinge pipe 31, the inner diameter of the hinge sleeve 41 is matched with the outer diameter of the hinge pipe 31, and the hinge sleeve 41 can rotate around the circumferential direction of the hinge pipe 31.

[0057] Referring to Figure 2 With Figure 4 , the driving mechanism 50 is arranged on the lower side of the bridge deck slab 30 to drive the guardrail 40 to stand vertically on the two sides of the bridge deck slab 30 or to flatten on the two sides of the bridge deck slab 30. Specifically, the driving mechanism 50 includes a first hinge column 51, a first screw column 52, a second hinge column 53, a second screw column 54, an adjusting cylinder 55 and a power source 56. The upper end of the first hinge column 51 is hinged to one side of the guardrail 40 away from the bridge deck slab 30, and the lower end of the first hinge column 51 extends obliquely downward.

[0058] The axis of the first screw column 52 is perpendicular to the length direction of the bridge deck slab 30, and the first screw column 52 is connected with the bailey frame 20 in sliding mode along the horizontal direction. Specifically, the bailey frame 20 is fixed with a first support cylinder 22, the axis of the first support cylinder 22 is perpendicular to the length direction of the bridge deck slab 30, the first support cylinder 22 is sleeved on the first screw column 52, and the first screw column 52 is connected with the first support cylinder 22 in sliding mode along the axial direction. The end of the first screw column 52 towards the first hinge column 51 is hinged with the lower end of the first hinge column 51.

[0059] The upper end of the second hinge column 53 is hinged to the side of the other guardrail 40 away from the bridge deck slab 30, and the lower end of the second hinge column 53 extends obliquely downward.

[0060] The axis of the second stud 54 is perpendicular to the length direction of the bridge deck 30, and the second stud 54 is connected to the bailey frame 20 in a sliding manner along the horizontal direction. Specifically, the second support cylinder 23 is fixed on the bailey frame 20, the axis of the second support cylinder 23 is perpendicular to the length direction of the bridge deck 30, the second support cylinder 23 is sleeved on the second stud 54, and the second stud 54 is connected to the second support cylinder 23 in a sliding manner along the axial direction. The end of the second stud 54 towards the second hinge column 53 is hinged to the lower end of the second hinge column 53, and the screw rotation direction of the second stud 54 is opposite to that of the first stud 52.

[0061] The adjusting cylinder 55 is stationary relative to the bailey frame 20 along the axial direction, and the adjusting cylinder 55 rotates relative to the bailey frame 20 along the circumferential direction. Specifically, two limiting plates 21 are fixed on the bailey frame 20, and the two limiting plates 21 abut against the two ends of the adjusting cylinder 55, respectively. The adjusting cylinder 55 is connected to the two limiting plates 21 in a rotating manner along the circumferential direction. If necessary, a tapered roller bearing or a thrust ball bearing can be installed at both ends of the adjusting cylinder 55 to reduce the friction between the adjusting cylinder 55 and the limiting plates 21 when the adjusting cylinder 55 rotates, so that the adjusting cylinder 55 rotates more labor-saving.

[0062] The adjusting cylinder 55 is threadedly connected to the first stud 52 and the second stud 54. Specifically, in one embodiment, the number of adjusting cylinders 55 is one, and the adjusting cylinder 55 is sleeved on the end of the first stud 52 away from the first hinge column 51 and the end of the second stud 54 away from the second hinge column 53, respectively. The adjusting cylinder 55 is threadedly connected to the first stud 52 and the second stud 54, and rotating the adjusting cylinder 55 can drive the first stud 52 and the second stud 54 to approach or move away from each other.

[0063] In another embodiment, the number of adjusting cylinders 55 is two, and the two adjusting cylinders 55 are arranged side by side and located between the same two limiting plates 21. The two adjusting cylinders 55 are sleeved on the end of the first stud 52 away from the first hinge column 51 and the end of the second stud 54 away from the second hinge column 53, respectively, and the two adjusting cylinders 55 are threadedly connected to the first stud 52 and the second stud 54, respectively. The two adjusting cylinders 55 are synchronously rotated to drive the first stud 52 and the second stud 54 to approach or move away from each other. Compared with driving the first stud 52 and the second stud 54 to approach or move away from each other by one adjusting cylinder 55, the same length of adjusting cylinder 55 can drive the first stud 52 and the second stud 54 to approach or move away from each other by two adjusting cylinders 55, and the adjusting stroke is larger.

[0064] The power source 56 is an electric motor fixed on the bailey frame 20, and the power source 56 is connected to the adjusting cylinder 55 through chain transmission to drive the adjusting cylinder 55 to rotate.

[0065] Referring toFigure 4 With Figure 5 The first support cylinder 22 is provided with a first extension cylinder 24, and the second support cylinder 23 is provided with a second extension cylinder 25. The first extension cylinder 24 and the second extension cylinder 25 have the same structure. In this embodiment, the first extension cylinder 24 is taken as an example for description. The first extension cylinder 24 is sleeved on the first stud 52 and is in sliding connection with the first stud 52 in the axial direction. The first extension cylinder 24 is arranged on the first support cylinder 22 and is in sliding connection with the first support cylinder 22 in the axial direction.

[0066] The first extension cylinder 24 is fixedly connected to the end of the first stud 52 away from the adjusting cylinder 55. Specifically, the end of the first extension cylinder 24 away from the adjusting cylinder 55 is provided with a first insertion slot 241, and the first insertion slot 241 is arranged with an upward opening. The first stud 52 can be inserted into the first insertion slot 241. The first stud 52 is hinged to the first hinge column 51 through a hinge shaft 512. The first extension cylinder 24 is provided with a penetrating hole 242, and the hinge shaft 512 penetrates the penetrating hole 242, so that the first extension cylinder 24 can slide synchronously with the first stud 52 in the horizontal direction. The first extension cylinder 24 slides with the first stud 52, so that the first extension cylinder 24 can support the first stud 52 and thus bear a larger pressure.

[0067] The end of the first hinge column 51 toward the first stud 52 is fixedly provided with a first support block 511. When the two guardrails 40 are vertically erected on the two sides of the bridge deck 30, the first support block 511 is pressed against the upper side of the first support cylinder 22, so that part of the pressure applied by the guardrail 40 to the first hinge column 51 can be borne by the first extension cylinder 24, thereby reducing the pressure on the first stud 52.

[0068] Referring to Figure 6 When two vehicles traveling in opposite directions need to pass each other, the power source 56 drives the adjusting cylinder 55 to rotate, thereby driving the first stud 52 and the second stud 54 to move close to each other, and driving the guardrails 40 to flatten on the two sides of the bridge deck 30, so as to widen the width of the steel trestle and facilitate the two vehicles traveling in opposite directions to pass each other, i.e., one vehicle is generally located on the upper side of the guardrail 40, and the other half is located on the upper side of the bridge deck 30, without the need to drive to the passing point for passing. The two guardrails 40 are supported by the first hinge column 51, the second hinge column 53, and the I-beam 26 extending out of the bridge deck 30, so as to support the weight of half of the vehicle body.

[0069] The implementation principle of the embodiment 1 is as follows: initially, the two guardrails 40 are vertically erected on the two sides of the bridge deck 30, and the first hinge column 51 and the second hinge column 53 of the driving mechanism 50 provide support for the guardrails 40, as shown in Figure 2When two vehicles running in opposite directions need to pass each other, the power source 56 drives the adjusting cylinder 55 to rotate, so as to drive the first stud 52 and the second stud 54 to approach each other, drive the guardrails 40 to be flattened on both sides of the bridge deck 30, and widen the width of the steel trestle, so as to facilitate the two vehicles running in opposite directions to pass each other. After the two vehicles running in opposite directions pass each other, the power source 56 drives the adjusting cylinder 55 to rotate, so as to drive the first stud 52 and the second stud 54 to move away from each other, and drive the guardrails 40 to stand vertically on both sides of the bridge deck 30.

[0070] Embodiment 2

[0071] The embodiment of the present application discloses a construction method of a steel trestle, which comprises the following steps:

[0072] S1, insert and fix the pile foundation 10 on the riverbed. That is, the pile foundation 10 is inserted and fixed in the riverbed by a pile driver, and two pile foundations 10 form a group, and multiple groups of pile foundations 10 are arranged at intervals along the length direction of the steel trestle.

[0073] S2, fix the bailey frame 20 on the upper side of the pile foundation 10. That is, a cross beam 11 is first welded and fixed on the upper side of the two pile foundations 10 in the same group, and then the bailey frame 20 is fixed on the upper side of the multiple cross beams 11.

[0074] S3, fix the bridge deck 30 on the upper side of the bailey frame 20.

[0075] S4, hingedly install the guardrail 40 on both sides of the bridge deck 30. That is, the hinged sleeve 41 is first sleeved on the hinge pipe 31, then the hinge pipe 31 is welded and fixed on both sides of the bridge deck 30 through the fixing column 32, and then the multiple hinged sleeves 41 and the lower side of the guardrail 40 are welded and fixed together.

[0076] S5, install the driving mechanism 50 on the lower side of the bridge deck 30, control the driving mechanism 50 to adjust the guardrail 40 to stand vertically on both sides of the bridge deck 30. When two vehicles running in opposite directions need to pass each other, control the driving mechanism 50 to drive the two guardrails 40 to be flattened on both sides of the bridge deck 30, so as to facilitate the two vehicles running in opposite directions to pass each other.

[0077] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A steel trestle, characterized in that, The utility model relates to a bridge deck system, which comprises: a pile foundation (10); a sheet pile frame (20) fixed to the upper side of the pile foundation (10); a bridge deck (30) fixed to the upper side of the sheet pile frame (20); two guardrails (40) respectively hinged to the two sides of the bridge deck (30); and a driving mechanism (50) provided on the lower side of the bridge deck (30) to drive the guardrails (40) to stand vertically on the two sides of the bridge deck (30) or to lie flat on the two sides of the bridge deck (30); the driving mechanism (50) comprises: a first hinge column (51) hinged at one end to one side of one of the guardrails (40) away from the bridge deck (30); a first threaded stud (52) slidingly connected to the sheet pile frame (20) in the horizontal direction, the axis of the first threaded stud (52) being perpendicular to the length direction of the bridge deck (30), one end of the first threaded stud (52) being hinged to the other end of the first hinge column (51); a second hinge column (53) hinged at one end to one side of the other guardrail (40) away from the bridge deck (30); a second threaded stud (54) slidingly connected to the sheet pile frame (20) in the horizontal direction, the axis of the second threaded stud (54) being perpendicular to the length direction of the bridge deck (30), one end of the second threaded stud (54) being hinged to the other end of the second hinge column (53), the thread direction of the second threaded stud (54) being opposite to that of the first threaded stud (52); an adjusting cylinder (55) threadedly connected to the first threaded stud (52) and the second threaded stud (54), the adjusting cylinder (55) being stationary in the axial direction relative to the sheet pile frame (20), the adjusting cylinder (55) being rotatable in the circumferential direction relative to the sheet pile frame (20) to drive the first threaded stud (52) and the second threaded stud (54) to move towards or away from each other; and a power source (56) provided on the sheet pile frame (20) to drive the adjusting cylinder (55) to rotate; each side of the bridge deck (30) is fixed with a hinge pipe (31), the lower side of each guardrail (40) is fixed with a hinge sleeve (41), the hinge sleeve (41) is sleeved on the hinge pipe (31), and the hinge sleeve (41) is rotatable about the axis of the hinge pipe (31).

2. The steel trestle according to claim 1, characterized in that: limiting plates (21) are provided on the sheet pile frame (20), the limiting plates (21) are fixed relative to the sheet pile frame (20), two of the limiting plates (21) correspond to one of the adjusting cylinders (55), and the two limiting plates (21) abut the two ends of the adjusting cylinder (55) respectively, the adjusting cylinder (55) being rotatably connected to the two limiting plates (21).

3. The steel trestle according to claim 1, characterized in that: The first support cylinder (22) is provided with a first extension cylinder (24) away from one side of the adjusting cylinder (55), the first extension cylinder (24) is provided on the first support cylinder (22) and is in sliding connection with the first support cylinder (22), the first extension cylinder (24) is fixedly connected with the end of the first stud (52) away from the adjusting cylinder (55), and the first extension cylinder (24) has a first insertion slot (241) for inserting the first hinged stud (51).

4. The steel trestle according to claim 3, characterized in that: The first hinged stud (51) is fixed with a first support block (511) towards the end of the first stud (52), when the guardrail (40) is vertically erected on both sides of the bridge deck slab (30), the first support block (511) is pressed on the upper side of the first support cylinder (22).

5. The steel trestle according to claim 4, characterized in that: The second support cylinder (23) is provided with a second extension cylinder (25) away from one side of the adjusting cylinder (55), the second extension cylinder (25) is provided on the second support cylinder (23) and is in sliding connection with the second support cylinder (23), the second extension cylinder (25) is fixedly connected with the end of the second stud (54) away from the adjusting cylinder (55), and the second extension cylinder (25) has a second insertion slot (251) for inserting the second hinged stud (53).

6. The steel trestle according to claim 3, characterized in that: The number of the adjusting cylinder (55) is two, the two adjusting cylinders (55) are respectively and one-to-one matched with the first stud (52) and the second stud (54), the two adjusting cylinders (55) are arranged side by side, and the two adjusting cylinders (55) are synchronously rotated.

7. The steel trestle of claim 1, wherein: The method comprises the following steps:

8. The method of constructing a steel trestle according to any one of claims 1 to 7, wherein S1, inserting and driving the pile foundation (10) to be fixed on the riverbed; S2, fixing the bailey frame (20) on the upper side of the pile foundation (10); S3, fixing the bridge deck slab (30) on the upper side of the bailey frame (20); S4, hingedly installing the guardrail (40) on both sides of the bridge deck slab (30); S5, installing the driving mechanism (50) on the lower side of the bridge deck slab (30), and controlling the driving mechanism (50) to adjust the guardrail (40) to be vertically erected on both sides of the bridge deck slab (30). ​

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