An open type temporary steel trestle

Abstract

This application relates to an openable temporary steel trestle bridge, belonging to the technical field of steel trestle bridges. It includes a temporary trestle bridge and lifting piles fixed in the river channel. The lifting piles are distributed at both ends of the temporary trestle bridge, and winches are installed on the lifting piles to lift the ends of the temporary trestle bridge upwards. The temporary trestle bridge includes Bailey bridge sections, each Bailey bridge section including an upper chord and a lower chord. The upper chord is longer than the lower chord. Multiple Bailey bridge sections are arranged, with adjacent Bailey bridge sections arranged along the length of the temporary trestle bridge. The lower chords of adjacent Bailey bridge sections are hinged to each other, with the hinge axis horizontally arranged perpendicular to the length of the temporary trestle bridge. The upper chords of adjacent Bailey bridge sections overlap each other. The top surface of the temporary trestle bridge is longer than the bottom surface, forming an arc. Multiple rows of Bailey bridge sections are spaced apart along the width of the temporary trestle bridge. A decorative window is fixed between adjacent Bailey bridge sections along the width of the temporary trestle bridge to enhance its load-bearing capacity. This application has the effect of resisting the downward tendency of the middle section of the steel trestle bridge.

Description

Technical Field

[0001] This application relates to the technical field of steel trestle bridges, and in particular to an openable temporary steel trestle bridge. Background Technology

[0002] Currently, a pier typically refers to a bridge built over a river, lake, or sea. It has a supporting structure, but usually lacks a deck; instead, it is suspended from below, resembling a boardwalk. The advantage of this bridge design is that it does not obstruct water traffic and is commonly used in areas where maintaining unobstructed waterways is crucial.

[0003] The steel trestle is assembled from multiple Bailey panels. Since the area beneath the steel trestle cannot obstruct water traffic, it needs to be able to move vertically. This is usually done by setting up columns in the water at both ends of the trestle, with winches mounted on the columns to lift the trestle upwards.

[0004] After the steel trestle is lifted, since the suspension points are at both ends of the steel trestle, after a long period of use, the steel trestle will sag, that is, the middle of the steel trestle will sag, which will affect the stable passage of vehicles on the steel trestle. Summary of the Invention

[0005] To counteract the downward trend of the middle section of the steel trestle, this application provides an openable temporary steel trestle.

[0006] The technical solution for an openable temporary steel trestle bridge provided in this application is as follows: An openable temporary steel trestle bridge includes a temporary trestle bridge and lifting piles fixed in a river channel. The lifting piles are distributed at both ends of the temporary trestle bridge, and winches are installed on the lifting piles to lift the ends of the temporary trestle bridge upwards. The temporary trestle bridge includes Bailey bridge sections, each Bailey bridge section including an upper chord and a lower chord. The upper chord is longer than the lower chord. Multiple Bailey bridge sections are arranged, with adjacent Bailey bridge sections arranged along the length of the temporary trestle bridge. The lower chords of adjacent Bailey bridge sections are hinged to each other, and the hinge axis is horizontally set along the perpendicular length of the temporary trestle bridge. The upper chords of adjacent Bailey bridge sections overlap each other. The top surface of the temporary trestle bridge is longer than the bottom surface, forming an arc. Along the width of the temporary trestle bridge, multiple rows of Bailey bridge sections are distributed at intervals. A decorative window for enhancing the load-bearing capacity of the temporary trestle bridge is fixed between adjacent Bailey bridge sections along the width of the temporary trestle bridge.

[0007] By adopting the above technical solution, due to the shape of the Bailey panels, the upper chord is longer than the lower chord, resulting in a temporary pier with an arched top surface that is larger than the bottom surface. When the winches at both ends of the temporary pier lift it upwards, the pier is affected by its own weight, causing the middle section to tend to sag. After prolonged use, this sag in the middle cancels out the initial arching of the top surface, ultimately keeping the temporary pier level. This resists the impact of the sag in the middle of the temporary pier, extending its service life. The presence of the decorative windows further enhances the load-bearing capacity of the temporary pier, resisting deformation.

[0008] Optionally, the decorative window includes a top rod, a bottom rod, and vertical rods. The vertical rods are vertically arranged and include a first vertical tube and a second vertical tube. The first vertical tube has multiple first protrusions fixed at intervals along the vertical direction inside, and the second vertical tube has multiple second protrusions fixed at intervals along the vertical direction on its outer wall. One end of the second vertical tube is fixedly connected to the bottom rod, and the other end is inserted into the first vertical tube and slidably connected to it. The end of the first vertical tube away from the second vertical tube is rotatably connected to the top rod. The rotation axis of the first vertical tube coincides with its own central axis. The first and second protrusions are staggered in the horizontal direction. There are two vertical rods between the top rod and the bottom rod.

[0009] By adopting the above technical solution, since the temporary pier is assembled and its size changes with each use, the overall height of the decorative window can be changed by adjusting the overall height of the vertical poles, allowing the decorative window to be reused and adapted to temporary piers of different heights.

[0010] Optionally, an internal support is also provided between the flower windows. The internal support includes a first internal support rod, a second internal support rod, and a locking disc. One end of the first internal support rod is hinged to the bottom rod, and the other end is slidably connected to the second internal support rod. The hinge axis of the first internal support rod is perpendicular to the bottom rod and is set horizontally. The end of the second internal support rod away from the first internal support rod is hinged to the top rod. The hinge axis of the second internal support rod is perpendicular to the top rod and is set horizontally. The end of the first internal support rod slides along the length direction of the second internal support rod. The locking disc is used to limit the position of the first internal support rod after it slides relative to the second internal support rod.

[0011] By adopting the above technical solution, the presence of internal supports further enhances the load-bearing capacity of the window frame, allowing the force at the middle of the top and bottom rods to be transferred to the internal supports, thus improving the overall load-bearing capacity of the window frame. Furthermore, the length of the internal supports can be adjusted to accommodate changes in the positions of the top and bottom rods.

[0012] Optionally, the locking disc is sleeved at the junction of the first inner support rod and the second inner support rod, the locking disc is rotatably connected to the outer wall of the second inner support rod, the locking disc rotates relative to the second inner support rod, the outer wall of the first inner support rod is provided with a threaded section, the threaded section is provided with multiple segments spaced apart along the length direction of the first inner support rod, and the first inner support rod is threadedly connected to the locking disc.

[0013] By adopting the above technical solution, rotating the locking disc causes the locking disc to be threadedly connected to the first inner support rod, thereby locking the positions of the first inner support rod and the second inner support rod. The operation is simple and convenient, and the threaded sections are set at intervals, which can quickly realize the stepped adjustment of the inner support.

[0014] Optionally, a first telescopic rod is provided between the first inner support rod and the first vertical tube. One end of the first telescopic rod is hinged to the first inner support rod, and the other end abuts against the bottom edge of the first vertical tube. A retaining ring is rotatably provided on the first telescopic rod. A through hole is opened on the first vertical tube, and the end of the retaining ring is inserted into the through hole. A check valve assembly for unidirectional rotation of the retaining ring is provided on the first telescopic rod.

[0015] By adopting the above technical solution, the first telescopic rod divides the space between the inner support and the vertical rod into multiple segments, forming at least one stable triangular shape, thereby enhancing the load-bearing capacity and deformation resistance of the window frame. Simultaneously, the presence of the first telescopic rod also limits the position of the first inner support rod, preventing it from rotating after being locked in place.

[0016] Optionally, the check valve assembly includes a check valve box, a check valve shaft, a check valve bolt, a ratchet, and a pawl. The ratchet is fixedly mounted on the check valve shaft and located inside the check valve box. The check valve shaft is rotatably mounted on the check valve box, with one end located outside the check valve box and fixedly connected to one end of a retaining ring. One end of the check valve bolt passes through the check valve box and is threadedly connected to the inner wall of the check valve box. The pawl is located inside the check valve box and is mounted on the check valve bolt. One end of the pawl abuts against the ratchet. The check valve bolt is used to drive the pawl to separate from the ratchet.

[0017] By adopting the above technical solution, rotating the retaining ring causes its end to be inserted into the through hole. During this process, the ratchet rotates together with the retaining ring, and the pawl restricts the rotation of the ratchet. When it is necessary for the retaining ring to disengage from the through hole, the ratchet and pawl are separated by the check bolt, thereby realizing the reset of the retaining ring.

[0018] Optionally, a limit block is fixed on the check bolt, and a limit ring is provided on the pawl. The limit ring is sleeved on the check bolt and has a limit groove. The limit block is located in the limit groove and its length direction is along the length direction of the check bolt. One end of the pawl is sleeved on the limit ring, and the torsion spring of the pawl itself is located between the outer wall of the limit ring and the pawl. The torsion spring is used to make the end of the pawl tightly abut against the ratchet.

[0019] By adopting the above technical solution, rotating the check bolt causes the limit ring to rotate via the limit block. The rotation of the limit ring, in turn, causes the pawl to rotate via the coil spring, thus separating the ratchet and the pawl. Simultaneously, after the ratchet and pawl are in normal engagement, rotating the check bolt connects it to the internal thread of the check box, improving the stability of the pawl after placement. Furthermore, the rotation angle of the check bolt can adjust the return force of the torsion spring, enhancing the tightness of the engagement between the pawl and the ratchet.

[0020] Optionally, a second telescopic rod is provided between the base rod and the locking plate. One end of the second telescopic rod is hinged to the base rod, and the other end is detachably connected to the locking plate. The specific structure of the second telescopic rod is the same as that of the first telescopic rod. A locking hole is provided on the locking plate, and the end of the retaining ring on the second telescopic rod is inserted into the locking hole.

[0021] By adopting the above technical solution, the second telescopic rod plays a limiting role in the locking disc, preventing the locking disc from rotating at will and ensuring the stability of the internal support. At the same time, the second telescopic rod itself also improves the overall load-bearing capacity of the window.

[0022] Optionally, the arch height of the top surface of the temporary trestle is 1:1000 to 1:3000 of the span of the temporary trestle.

[0023] Optionally, the lifting pile is equipped with a preset position, a fixed limit sensor, and a control mechanism. When the winches at both ends of the temporary trestle are started, the limit sensor detects whether the two ends of the temporary trestle are synchronized at the preset position. If they are synchronized at the preset position, the control mechanism generates a start command, and the winches continue to work. If the two ends of the temporary trestle are not synchronized at the preset position, the winch at the end of the temporary trestle that reaches the preset position first stops working until the two ends of the temporary trestle are synchronized and then restarted.

[0024] By adopting the above technical solution, due to the large span of the temporary trestle, there will be a delay in the start-up time of the winches at both ends of the temporary trestle during the hoisting process. This will cause the temporary trestle to be raised at one end and lower at the other during the hoisting process. Not only will the temporary trestle be subjected to uneven force, but the winches at both ends of the temporary trestle will also be subjected to uneven force. By using preset positions and limit sensors, the winches at both ends can apply force synchronously, and the temporary trestle can be subjected to force synchronously, thus extending the service life of the winches and the temporary trestle.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The Bailey bridge itself is designed with the upper chord longer than the lower chord, and the top surface of the final assembled temporary bridge is larger than the bottom surface, forming an arch shape. This resists the impact of the middle of the temporary bridge sagging and extends the service life of the temporary bridge. 2. The presence of decorative windows further enhances the load-bearing capacity of the temporary pier, and the decorative windows as a whole can improve the load-bearing capacity and deformation resistance of the temporary pier; 3. The presence of limit sensors ensures that the winch synchronously lifts the temporary trestle. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the temporary pier being raised during the application process; Figure 2 This is a schematic diagram of the assembly of adjacent Bailey panels; Figure 3 This is a partial structural cross-sectional view of the lattice window; Figure 4 This is a cross-sectional view of the internal structure of the check valve component.

[0027] In the diagram, 1. Bailey plate; 11. Upper chord; 12. Lower chord; 2. Window frame; 21. Top rod; 22. Bottom rod; 23. Vertical rod; 24. First vertical tube; 241. First protrusion; 242. Through hole; 25. Second vertical tube; 251. Second protrusion; 3. Inner support; 31. First inner support rod; 32. Second inner support rod; 33. Locking disc; 331. Locking hole; 4. First telescopic rod; 41. Snap ring; 5. Second telescopic rod; 6. Check valve assembly; 61. Check valve box; 62. Check valve shaft; 63. Check valve bolt; 631. Limiting block; 64. Ratchet; 65. Pawl; 651. Limiting ring; 7. Lifting pile; 71. Winch. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0029] This application discloses an openable temporary steel trestle bridge.

[0030] refer to Figure 1 An openable temporary steel trestle bridge includes a temporary trestle bridge with lifting piles 7 at both ends. The lifting piles 7 are vertically fixed in the river channel and a winch 71 is fixed on the lifting piles 7. The winch 71 fixes the ends of the temporary trestle bridge, thereby lifting the temporary trestle bridge upward to facilitate the passage of boats below the temporary trestle bridge.

[0031] The lifting pile 7 is equipped with a preset position, fixed limit sensors, and a control mechanism. When the winches 71 at both ends of the temporary trestle are started, the limit sensors detect whether the two ends of the temporary trestle are synchronized at the preset position. If they are synchronized at the preset position, the limit sensors send a signal, and the control mechanism generates a start command after receiving the signal, and the winches 71 continue to work. If the two ends of the temporary trestle are not synchronized at the preset position, the limit sensors send a signal, and the control mechanism generates a stop command after receiving the signal, and the winch 71 at the end of the temporary trestle that reaches the preset position first stops working until the two ends of the temporary trestle are synchronized and then restart.

[0032] refer to Figure 1 and Figure 2 The temporary trestle bridge is actually a Bailey bridge with a frame, which is assembled from multiple Bailey panels. The Bailey bridge section 1 includes an upper chord 11 and a lower chord 12. The upper chord 11 is longer than the lower chord 12. The lower chords 12 of adjacent Bailey bridge sections 1 are hinged to each other, and the hinge axis is set horizontally along the length of the temporary trestle. The upper chords 11 of adjacent Bailey bridge sections 1 overlap each other, that is, one end of the upper chord 11 is convex and the other end is concave and stepped, so that adjacent upper chords 11 can overlap each other. The top surface of the temporary trestle is longer than the bottom surface, forming an arc. The arch height of the arc of the top surface of the temporary trestle is 1:1000 to 1:3000 of the span of the temporary trestle. Along the width of the temporary trestle, Bailey bridge sections 1 are distributed in multiple rows at intervals. Two rows form a group, and two groups are set on a single temporary trestle. In a single group, a decorative window 2 is fixed between adjacent Bailey bridge sections 1. The decorative window 2 is fixed to the Bailey bridge section 1 by bolts. The decorative window 2 is set perpendicular to the Bailey bridge section 1.

[0033] refer to Figure 2 and Figure 3 The window 2 includes a top rod 21, a bottom rod 22, and a vertical rod 23. The top rod 21 and the bottom rod 22 are parallel to each other and are both horizontally arranged. The vertical rod 23 is vertically arranged. There are two vertical rods 23 in one window 2, and they are located at the ends of the top rod 21 respectively. That is, the window 2 is rectangular.

[0034] refer to Figure 2 and Figure 3 The vertical rod 23 includes a first vertical tube 24 and a second vertical tube 25. The first vertical tube 24 is rectangular, and the second vertical tube 25 is circular. Multiple first protrusions 241 are fixed at intervals along the vertical direction inside the first vertical tube 24, and multiple second protrusions 251 are fixed at intervals along the vertical direction on the outer wall of the second vertical tube 25. Figure 3Only a pair of second protrusions 251 are shown for easy identification. One end of the second vertical tube 25 is fixedly connected to the base rod 22, and the other end is inserted into the first vertical tube 24 and slidably connected to the first vertical tube 24. The second vertical tube 25 slides relative to the first vertical tube 24 along its length. The end of the first vertical tube 24 away from the second vertical tube 25 is rotatably connected to the top rod 21. The rotation axis of the first vertical tube 24 coincides with its own central axis. The first protrusion 241 and the second protrusion 251 are horizontally offset. After the first vertical tube 24 has rotated completely, the first protrusion 241 and the second protrusion 251 abut against each other.

[0035] refer to Figure 3 Within the rectangular frame space formed by the flower window 2, there are also internal supports 3, a first telescopic rod 4, and a second telescopic rod 5. The internal supports 3 are inclined and are set along the diagonal of the rectangular frame. The first telescopic rod 4 and the second telescopic rod 5 are located on both sides of the internal supports 3.

[0036] refer to Figure 3 The inner support 3 includes a first inner support rod 31, a second inner support rod 32, and a locking disc 33. One end of the first inner support rod 31 is hinged to the bottom rod 22. The hinge axis of the first inner support rod 31 is horizontally set and along the length direction perpendicular to the bottom rod 22. The other end of the first inner support rod 31 is slidably connected to the second inner support rod 32. The end of the second inner support rod 32 away from the first inner support rod 31 is hinged to the top rod 21. The hinge axis of the second inner support rod 32 is set parallel to the hinge axis of the first inner support rod 31. The end of the first inner support rod 31 slides along the length direction of the second inner support rod 32. The locking disc 33 is sleeved at the junction of the second inner support rod 32 and the first inner support rod 31, that is, at the end of the second inner support rod 32 near the first inner support rod 31. The locking disc 33 is rotatably connected to the outer wall of the second inner support rod 32. The rotation axis of the locking disc 33 is the central axis of the second inner support rod 32. The outer wall of the first inner support rod 31 has a threaded section, and multiple threaded sections are provided. Adjacent threaded sections are spaced apart along the length of the first inner support rod 31. The locking disc 33 is threadedly connected to the first inner support rod 31. When it is necessary to adjust the total length of the inner support 3, the locking disc 33 is rotated to pass through the current threaded section, so that the end of the first inner support rod 31 further penetrates into the interior of the second inner support rod 32 until it penetrates to the appropriate position. Then, the locking disc 33 is threadedly connected to the nearest threaded section.

[0037] refer to Figure 3The length of the first telescopic rod 4 can be changed using existing industry technology, such as: one tube ring is fitted over the other, and bolt holes are opened on both tubes. The bolts pass through both tubes to lock the position after the total length of the two tubes changes. One end of the first telescopic rod 4 is hinged to the first inner support rod 31, and the hinge axis of the first telescopic rod 4 is set horizontally. The other end of the first telescopic rod 4 abuts against the bottom edge of the first vertical tube 24. The end face of the first telescopic rod 4 near the first vertical tube 24 is concave. The concave surface can be a smooth arc or a right-angle concave surface, thereby improving the stability of the first telescopic rod 4 after it abuts against the first vertical tube 24.

[0038] refer to Figure 3 and Figure 4 A retaining ring 41 and a check assembly 6 are rotatably mounted on the first telescopic rod 4. The retaining ring 41 is an incomplete ring with a notch. A through hole 242 is provided on the first vertical tube 24, and the end of the retaining ring 41 is inserted into the through hole 242. The check assembly 6 includes a check box 61, a check shaft 62, a check bolt 63, a ratchet 64, and a pawl 65. The ratchet 64 is ring-fixed on the check shaft 62 and located inside the check box 61. The check shaft 62 is rotatably mounted on the check box 61, with one end located outside the check box 61 and fixedly connected to one end of the retaining ring 41. The check shaft 62 rotates relative to the check box 61. One end of the check bolt 63 passes through the check box 61 and is threadedly connected to the inner wall of the check box 61. A pawl is fixed on the check bolt 63. A limiting block 631 is provided along the length of the check bolt 63. A limiting ring 651 is provided on the pawl 65, which is fitted around the check bolt 63. A limiting groove is formed on the inner wall of the limiting ring 651, and the limiting block 631 is located in the limiting groove. One end of the pawl 65 is fitted around the limiting ring 651. A torsion spring of the pawl 65 is fixed between the outer wall of the limiting ring 651 and the pawl 65. The end of the pawl 65 away from the check bolt 63 abuts against the ratchet 64. By rotating the check bolt 63, the pawl 65 and the ratchet 64 can be changed from an abutting state to a disengaged state.

[0039] refer to Figure 3 and Figure 4 The specific structure of the second telescopic rod 5 is the same as that of the first telescopic rod 4. The second telescopic rod 5 is also equipped with a retaining ring 41 and a check valve assembly 6. The outer wall of the corresponding locking disc 33 is rectangular. The locking disc 33 has a locking hole 331. The locking hole 331 is opened on all four side walls of the locking disc 33. The end of the retaining ring 41 on the second telescopic rod 5 is inserted into the corresponding locking hole 331, thereby limiting the locking disc 33. At this time, the second telescopic rod 5 also supports the inner support 3.

[0040] The implementation principle of an openable temporary steel trestle in this application embodiment is as follows: the Bailey bridge 1 has its own shape design, with the upper chord 11 being longer than the lower chord 12. The final assembled temporary trestle has a top surface that is larger than the bottom surface, forming an arch shape, which resists the impact of the middle of the temporary trestle sagging and extends the service life of the temporary trestle. The presence of the decorative window 2 further enhances the load-bearing capacity of the temporary trestle, and the decorative window 2 as a whole can improve the load-bearing capacity and deformation resistance of the temporary trestle. The presence of the limit sensor ensures that the winch 71 synchronously lifts the temporary trestle.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An openable temporary steel trestle bridge, comprising a temporary trestle bridge and lifting piles (7) fixed in a river channel, wherein the lifting piles (7) are distributed at both ends of the temporary trestle bridge, and a winch (71) for lifting the ends of the temporary trestle bridge upwards is provided on the lifting piles (7), characterized in that: The temporary trestle includes Bailey panels (1), each Bailey panel (1) including an upper chord (11) and a lower chord (12). The upper chord (11) is longer than the lower chord (12). Multiple Bailey panels (1) are provided, with adjacent Bailey panels (1) arranged along the length of the temporary trestle. The lower chords (12) of adjacent Bailey panels (1) are hinged to each other, and the hinge axis is horizontally set along the perpendicular length of the temporary trestle. The upper chords (11) of adjacent Bailey panels (1) overlap each other. The top surface of the temporary trestle is longer than the bottom surface, forming an arc. Along the width of the temporary trestle, multiple rows of Bailey panels (1) are spaced apart. A decorative window (2) for enhancing the load-bearing capacity of the temporary trestle is fixed between adjacent Bailey panels (1) along the width of the temporary trestle. 2) Includes a top rod (21), a bottom rod (22), and a vertical rod (23). The vertical rod (23) is vertically arranged and includes a first vertical tube (24) and a second vertical tube (25). The first vertical tube (24) has multiple first protrusions (241) fixed at intervals along the vertical direction inside. The second vertical tube (25) has multiple second protrusions (251) fixed at intervals along the vertical direction on its outer wall. One end of the second vertical tube (25) is fixedly connected to the bottom rod (22), and the other end is inserted into the first vertical tube (24) and slidably connected to the first vertical tube (24). The end of the first vertical tube (24) away from the second vertical tube (25) is rotatably connected to the top rod (21). The rotation axis of the first vertical tube (24) coincides with its own central axis. A protrusion (241) and a second protrusion (251) are offset in the horizontal direction; two vertical rods (23) are provided between the top rod (21) and the bottom rod (22); an inner support (3) is also provided between the flower windows (2), the inner support (3) includes a first inner support rod (31), a second inner support rod (32) and a locking disc (33), one end of the first inner support rod (31) is hinged to the bottom rod (22), and the other end is slidably connected to the second inner support rod (32), the hinge axis of the first inner support rod (31) is perpendicular to the bottom rod (22) and is set horizontally, the end of the second inner support rod (32) away from the first inner support rod (31) is hinged to the top rod (21), the hinge axis of the second inner support rod (32) is perpendicular to the top rod (21) and is set horizontally. The end of the first inner support rod (31) slides along the length of the second inner support rod (32), and the locking disc (33) is used to limit the position of the first inner support rod (31) relative to the second inner support rod (32) after sliding; a first telescopic rod (4) is provided between the first inner support rod (31) and the first vertical tube (24), one end of the first telescopic rod (4) is hinged to the first inner support rod (31), and the other end abuts against the bottom edge of the first vertical tube (24); a retaining ring (41) is rotatably provided on the first telescopic rod (4), a through hole (242) is opened on the first vertical tube (24), the end of the retaining ring (41) is inserted into the through hole (242), and a check assembly (6) for the one-way rotation of the retaining ring (41) is provided on the first telescopic rod (4);The check valve assembly (6) includes a check valve box (61), a check valve shaft (62), a check valve bolt (63), a ratchet (64), and a pawl (65). The ratchet (64) is fixedly fitted onto the check valve shaft (62) and located inside the check valve box (61). The check valve shaft (62) is rotatably mounted on the check valve box (61), with one end located outside the check valve box (61) and fixedly connected to one end of a retaining ring (41). One end of the check valve bolt (63) passes through the check valve box (61) and is threadedly connected to the inner wall of the check valve box (61). The pawl (65) is located inside the check valve box (61) and is fitted onto the check valve bolt (63). One end of the pawl (65) abuts against the ratchet (64). The check valve bolt (63) is used to drive the pawl (65) to separate from the ratchet (64).

2. The openable temporary steel trestle bridge according to claim 1, characterized in that: The locking disc (33) is sleeved at the junction of the first inner support rod (31) and the second inner support rod (32). The locking disc (33) is rotatably connected to the outer wall of the second inner support rod (32). The locking disc (33) rotates relative to the second inner support rod (32). The outer wall of the first inner support rod (31) is provided with a threaded section. The threaded section is provided with multiple segments spaced apart along the length of the first inner support rod (31). The first inner support rod (31) is threadedly connected to the locking disc (33).

3. The openable temporary steel trestle bridge according to claim 1, characterized in that: A limiting block (631) is fixed on the check bolt (63), and a limiting ring (651) is provided on the pawl (65). The limiting ring (651) is sleeved on the check bolt (63) and has a limiting groove. The limiting block (631) is located in the limiting groove. The length direction of the limiting block (631) is set along the length direction of the check bolt (63). One end of the pawl (65) is sleeved on the limiting ring (651). The torsion spring of the pawl (65) itself is located between the outer wall of the limiting ring (651) and the pawl (65). The torsion spring is used to make the end of the pawl (65) tightly abut against the ratchet (64).

4. The openable temporary steel trestle bridge according to claim 1, characterized in that: A second telescopic rod (5) is provided between the base rod (22) and the locking disc (33). One end of the second telescopic rod (5) is hinged to the base rod (22), and the other end is detachably connected to the locking disc (33). The specific structure of the second telescopic rod (5) is the same as that of the first telescopic rod (4). A locking hole (331) is provided on the locking disc (33), and the end of the retaining ring (41) on the second telescopic rod (5) is inserted into the locking hole (331).

5. The openable temporary steel trestle bridge according to claim 1, characterized in that: The arch height of the top surface of the temporary trestle is 1:1000 to 1:3000 of the span of the temporary trestle.

6. The openable temporary steel trestle bridge according to claim 1, characterized in that: The lifting pile (7) is equipped with a preset position, a fixed limit sensor, and a control mechanism. The winches (71) at both ends of the temporary trestle are started. The limit sensor detects whether the two ends of the temporary trestle are synchronized at the preset position. If they are synchronized at the preset position, the control mechanism generates a start command and the winches (71) continue to work. If the two ends of the temporary trestle are not synchronized at the preset position, the winch (71) at the end of the temporary trestle that reaches the preset position first stops working until the two ends of the temporary trestle are synchronized and then it starts again.

Images