Stepless-regulation locking pressure cylinder and bridge girder erection machine

Abstract

The utility model relates to the technical field of bridge girder erection machine supporting, in particular to a stepless regulation locking pressure cylinder and a bridge girder erection machine. The locking pressure cylinder comprises a cylinder barrel and a piston rod, and the cylinder barrel is in sliding fit with the piston rod; the piston rod is provided with a threaded section, the portion, located outside the cylinder barrel, of the threaded section is in threaded connection with a locking nut, and the locking nut can abut against the cylinder barrel. According to the locking nut, mechanical locking of the length of the locking pressure cylinder can be achieved when the locking pressure cylinder extends to any length, the supporting length of the locking pressure cylinder can be adjusted in a stepless mode, and the locking nut can be suitable for supporting work of terrains with different heights.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge girder erection machine support technical field, especially a stepless regulation's locking pressure cylinder, bridge girder erection machine. BACKGROUND

[0002] The support leg is one of the most important structural components of the bridge girder erection machine, which supports the weight of the bridge girder erection machine or the guide beam and transmits the construction load to the pier or the bridge deck. During the bridge girder erection operation, the height of the support leg needs to be adjusted to adjust the horizontal posture of the main beam or the guide beam of the bridge girder erection machine to ensure the safety of the bridge girder erection. The support leg usually adopts an inner and outer telescopic column structure, which generally adjusts the relative telescopic position of the inner and outer columns by a piston rod type hydraulic cylinder and locks the relative telescopic position of the inner and outer columns by selecting different hole pins, thereby locking the support height of the support leg.

[0003] The bridge girder erection machine support leg with the hydraulic cylinder adjustment and the inner and outer telescopic column pin structure mainly has the following disadvantages: 1. The height is fixed for each adjustment, which is usually about 200mm, and only stepwise adjustment can be achieved, and the height of the support leg cannot be adjusted steplessly, which is difficult to adapt to different slope bridge girder erection conditions; 2. The pin shaft needs to be frequently inserted and pulled out during the operation of the bridge girder erection machine, and the operating workers also need to manually install the split pin as an anti-falling insurance to prevent accidents caused by accidental falling of the pin shaft, which is also troublesome to operate. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the technical problem that the height of the support leg of the bridge girder erection machine can only be adjusted stepwise in the prior art, and the height of the support leg cannot be adjusted steplessly, which is difficult to adapt to different slope bridge girder erection conditions, and provides a stepless regulation's locking pressure cylinder and bridge girder erection machine.

[0005] In the first aspect, the utility model provides a stepless regulation's locking pressure cylinder, which comprises a cylinder and a piston rod, and the cylinder and the piston rod are in sliding cooperation; the piston rod has a threaded segment, a locking nut is threadedly connected to the part outside the cylinder of the threaded segment, and the locking nut can abut against the cylinder.

[0006] Optionally, the top end of the piston rod is located inside the cylinder, and the bottom end of the piston rod is located outside the cylinder.

[0007] The locking pressure cylinder further comprises a core rod, the top end of the core rod is located outside the cylinder, and the bottom end of the core rod is located inside the cylinder and the piston rod.

[0008] The top end of the cylinder, the inner wall of the cylinder, the outer wall of the core rod and the top end of the piston rod cooperate to form a closed first movable chamber, the first movable chamber is communicated with a first medium channel, and the piston rod can extend relative to the cylinder when the first medium channel injects working medium into the first movable chamber; the bottom end of the core rod, the outer wall of the core rod, the top end of the piston rod and the inner wall of the piston rod cooperate to form a closed second movable chamber, the second movable chamber is communicated with a second medium channel, and the piston rod can retract relative to the cylinder when the second medium channel injects working medium into the second movable chamber.

[0009] Optionally, the top end of the piston rod is provided with a piston outside, the piston is sealed between the piston rod and the cylinder; the top end of the piston rod is provided with a first sealing ring inside, the bottom end of the core rod is provided with a second sealing ring outside, and the first sealing ring and the second sealing ring are sealed between the piston rod and the core rod.

[0010] The piston and the first sealing ring cooperate to participate in the sealing of the first movable chamber, and the first sealing ring and the second sealing ring cooperate to participate in the sealing of the second movable chamber.

[0011] Optionally, the bottom end of the cylinder is provided with a guide sleeve inside, the guide sleeve is sleeved outside the threaded segment of the piston rod, and the inner diameter of the guide sleeve is matched with the outer diameter of the threaded segment. The guide piston rod moves along a fixed path to avoid or reduce the deflection of the piston rod during extension and retraction, and ensure the supporting effect of the oil cylinder.

[0012] Optionally, the inner wall of the guide sleeve is a smooth circumferential surface.

[0013] Optionally, the thread of the threaded segment is a trapezoidal thread.

[0014] Optionally, the first medium channel is arranged at the top of the cylinder, the top opening of the first medium channel is located at the top end face of the cylinder, and the bottom opening of the first medium channel is communicated with the first movable chamber; the second medium channel penetrates the core rod, the top opening of the second medium channel is located at the top end face of the core rod, and the bottom opening of the second medium channel is communicated with the second movable chamber from the bottom of the outer wall of the core rod.

[0015] Optionally, the piston rod is a hollow structure, the bottom opening of the piston rod is provided with a connecting seat for connecting with the leg base, the connecting piece is provided with a vent hole, one end of the vent hole is communicated with the internal space of the piston rod, and the other end is communicated with the outside; the top outside of the cylinder is provided with a connecting flange.

[0016] The second aspect of the utility model provides a bridge girder erection machine, including support leg, be equipped with the locking pressure cylinder being as above any scheme in the support leg.

[0017] Optionally, the support leg further comprises a stand, a steel cushion box and a support leg base, the stand, the steel cushion box, the locking pressure cylinder and the support leg base are sequentially connected along the length direction of the support leg.

[0018] Compared with the prior art, the utility model has the advantages of:

[0019] 1. The utility model provides a locking pressure cylinder of stepless regulation, length adjustment of whole locking pressure cylinder is realized through the sliding of piston rod relative to the cylinder barrel, when locking pressure cylinder is elongated to the length required, the locking nut is moved to the cylinder barrel on the threaded section of piston rod by rotating locking nut, until locking nut abuts against cylinder barrel, based on this, piston rod cannot be withdrawn into the cylinder barrel through the block of locking nut, thereby mechanical locking of locking pressure cylinder length is realized, thereby the stability when locking pressure cylinder participates in the support of equipment is improved, locking nut can realize mechanical locking of locking pressure cylinder length when locking pressure cylinder is elongated to any length (in the oil cylinder stroke range), so that the support length of locking pressure cylinder can be infinitely adjusted, and can be applicable to the support operation of the terrain with different heights.

[0020] 2. The utility model provides a bridge girder erection machine, through the application of the locking pressure cylinder to the support leg of bridge girder erection machine, can realize the stepless adjustment of the support height of bridge girder erection machine to the locking of any position in the oil cylinder stroke range, thereby the stepless adjustment of the working height of the support leg of bridge girder erection machine is completed, and the adaptability to different girder erection slopes is better. The working height of support leg can be locked by rotating the locking nut on the piston rod of locking pressure cylinder, and it is no longer needed to lock the working height of support leg by frequently inserting and pulling the pin shaft, so as to reduce the labor amount of workers, and the efficiency is higher, and the overturning accident of bridge girder erection machine caused by hydraulic oil cylinder failure can be avoided, which is favorable to the stability of the whole machine structure of bridge girder erection machine and the safety of girder erection construction. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view when the utility model embodiment 1 is retracted.

[0022] Figure 2 It is a structural schematic view when the utility model embodiment 1 is extended.

[0023] Figure 3 It is a structural schematic view of the utility model embodiment 2.

[0024] Markings in the drawing:

[0025] 1 - locking cylinder; 11 - cylinder barrel; 111 - guide sleeve; 112 - connecting flange; 12 - piston rod; 121 - threaded section; 122 - piston; 123 - first sealing ring; 124 - connecting seat; 125 - vent hole; 13 - core rod; 131 - second sealing ring; 14 - first movable chamber; 141 - first medium passage; 15 - second movable chamber; 151 - second medium passage; 16 - locking nut; 2 - upright column; 3 - steel pad box; 4 - leg base. DETAILED DESCRIPTION

[0026] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as the scope of the above-mentioned subject matter of the utility model being limited to the following embodiments only, and any technology realized based on the content of the utility model falls within the scope of the utility model.

[0027] In the description of the specific embodiments of the utility model, the orientation or positional relationship terms appearing in the description, such as "up", "down", "left", "right", "center", "inner", "outer", etc., are based on the orientation or positional relationship expressed in the drawings, or the orientation or positional relationship in which the product / equipment / device of the utility model is usually placed. These orientation or positional relationship terms are merely for the convenience of describing the utility model scheme or simplifying the description in the specific embodiments, so as to enable the skilled person to quickly understand the scheme, and therefore cannot be understood as indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and thus cannot be understood as limiting the utility model.

[0028] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel", etc. appear, it does not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simply understood that the corresponding device / component / element is arranged in the "horizontal", "vertical", "overhanging", "parallel" direction, and can have an error / deviation of ±10% with respect to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the utility model.

[0029] In addition, the terms "first", "second", "third", etc. appearing in the terms are only used to distinguish the description of the same or similar parts, and should not be understood as emphasizing or implying the relative importance of a specific part.

[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] Example 1

[0033] like Figures 1-2 As shown, a steplessly adjustable locking pressure cylinder includes a cylinder barrel 11 and a piston rod 12, wherein the cylinder barrel 11 and the piston rod 12 are slidably engaged; the piston rod 12 has a threaded section 121, and a locking nut 16 is threadedly connected to the portion of the threaded section 121 located outside the cylinder barrel 11, wherein the locking nut 16 can abut against the cylinder barrel 11.

[0034] The length of the locking pressure cylinder is adjusted by sliding the piston rod 12 relative to the cylinder barrel 11. When the locking pressure cylinder extends to the required length, the locking nut 16 is rotated, causing the locking nut 16 to move toward the cylinder barrel 11 on the threaded section 121 of the piston rod 12 until the locking nut 16 abuts against the cylinder barrel 11. Based on this, the piston rod 12 cannot be retracted into the cylinder barrel 11 due to the obstruction of the locking nut 16, thereby achieving mechanical locking of the length of the locking pressure cylinder, thus improving the stability of the locking pressure cylinder when it participates in supporting the equipment. Moreover, the locking nut 16 can achieve mechanical locking of the length of the locking pressure cylinder when it extends to any length (within the cylinder stroke range), so that the support length of the locking pressure cylinder can be infinitely adjusted, making it suitable for support operations on terrains with different heights.

[0035] In one or more embodiments, the top end of the piston rod 12 is located inside the cylinder 11, and the bottom end of the piston rod 12 is located outside the cylinder 11.

[0036] The locking pressure cylinder further comprises a core rod 13, a top end of the core rod 13 is located outside the cylinder barrel 11, and a bottom end of the core rod 13 is located inside the cylinder barrel 11 and the piston rod 12; a top end of the cylinder barrel 11, an inner wall of the cylinder barrel 11, an outer wall of the core rod 13 and a top end of the piston rod 12 cooperatively form a closed first movable chamber 14, the first movable chamber 14 is communicated with a first medium channel 141, the first medium channel 141 can be arranged on the cylinder barrel 11 or the core rod 13 or the piston rod 12, and is used for realizing input or output of a working medium in the first movable chamber 14; when the first medium channel 141 injects the working medium into the first movable chamber 14, the piston rod 12 can extend relative to the cylinder barrel 11, at this time, the working medium in the second movable chamber 15 is discharged from a second medium channel 151.

[0037] A bottom end of the core rod 13, an outer wall of the core rod 13, a top end of the piston rod 12 and an inner wall of the piston rod 12 cooperatively form a closed second movable chamber 15, the second movable chamber 15 is communicated with the second medium channel 151, the second medium channel 151 can be arranged on the core rod 13 or the piston rod 12, and is used for realizing input or output of the working medium in the second movable chamber 15; when the second medium channel 151 injects the working medium into the second movable chamber 15, the piston rod 12 can retract relative to the cylinder barrel 11, at this time, the working medium in the first movable chamber 14 is discharged from the first medium channel 141.

[0038] Through cooperation of the first medium channel 141 and the second medium channel 151, the piston rod 12 is realized to extend or retract relative to the cylinder barrel 11

[0039] It can be understood by those skilled in the art that the above-mentioned medium can be a gas or a liquid.

[0040] In one or more embodiments, an outer side of the top end of the piston rod 12 is provided with a piston 122, the piston 122 is sealed between the piston rod 12 and the cylinder barrel 11; an inner side of the top end of the piston rod 12 is provided with a first sealing ring 123, an outer side of the bottom end of the core rod 13 is provided with a second sealing ring 131, and the first sealing ring 123 and the second sealing ring 131 are sealed between the piston rod 12 and the core rod 13.

[0041] The piston 122 and the first sealing ring 123 cooperatively participate in sealing the first movable chamber 14, the first sealing ring 123 and the second sealing ring 131 cooperatively participate in sealing the second movable chamber 15, thereby reducing or even avoiding leakage of the medium from the first movable chamber 14 or the second movable chamber 15, affecting extension or retraction of the piston rod 12, and causing pollution to the environment around the locking pressure cylinder.

[0042] In one or more embodiments, the bottom end of the cylinder 11 is further provided with a guide sleeve 111, which is sleeved on the threaded segment 121 of the piston rod 12, and the inner diameter of the guide sleeve 111 is matched with the outer diameter of the threaded segment 121. The cooperation of the guide sleeve 111 and the piston 122 guides the piston rod 12 to move along a fixed path, avoids or reduces the deflection of the piston rod 12 during the extension and retraction process, and ensures the supporting effect of the oil cylinder.

[0043] At this time, a cavity is formed between the guide sleeve 111, the piston 122, the outer wall of the piston rod 12, and the inner wall of the cylinder 11. The volume of the cavity decreases as the piston rod 12 extends, and increases as the piston rod 12 retracts. If the cavity is relatively airtight, the air in the cavity may interfere with the change of the volume of the cavity, thereby hindering the extension and retraction of the piston rod 12. Therefore, in one or more embodiments, the inner wall of the guide sleeve 111 is a smooth circular surface.

[0044] The smooth circular surface facilitates the sliding cooperation of the piston rod 12 and the guide sleeve 111. At the same time, it is convenient for the inner wall of the guide sleeve 111 and the thread groove of the threaded segment 121 of the piston rod 12 to naturally form an air passage for the gas in the cavity to enter and exit, which facilitates the change of the volume of the cavity, thereby avoiding or reducing the possibility of hindering the extension and retraction of the piston rod 12, and facilitating the extension and retraction of the piston rod 12.

[0045] The threads of the threaded segment 121 are preferably trapezoidal threads, which can ensure the strength of the threaded segment 121, improve the strength of the mechanical locking of the locking pressure cylinder, and ensure that the locking nut 16 can more stably support the cylinder 11. At the same time, the outermost surface of the trapezoidal thread is a circular surface matched with the inner wall of the guide sleeve 111, so that the contact between the threaded segment 121 and the inner wall of the guide sleeve 111 is a surface-to-surface contact, which makes the sliding of the threaded segment 121 in the guide sleeve 111 more stable, reduces the pressure of the contact surface when the threaded segment 121 and the inner wall of the guide sleeve 111 abut against each other, and thereby reduces the damage caused by extrusion when the threaded segment 121 and the inner wall of the guide sleeve 111 abut against each other, and improves the service life of the piston rod 12 and the guide sleeve 111.

[0046] In one or more embodiments, the first medium channel 141 is arranged at the top of the cylinder 11, the top opening of the first medium channel 141 is located at the top end face of the cylinder 11, and the bottom opening of the first medium channel 141 communicates with the first movable chamber 14.

[0047] The second medium channel 151 penetrates the core rod 13, the top opening of the second medium channel 151 is located at the top end face of the core rod 13, and the bottom opening of the second medium channel 151 communicates with the second movable chamber 15 from the bottom of the outer wall of the core rod 13.

[0048] The openings of the first medium channel 141 and the second medium channel 151 exposed to the outside are located at the top of the locking pressure cylinder. When the locking pressure cylinder is used, it is convenient to uniformly inject the medium from the top of the locking pressure cylinder into the corresponding movable chamber through the first medium channel 141 and the second medium channel 151, and complete the extension and retraction of the piston rod 12 of the locking pressure cylinder.

[0049] For the case of applying the locking pressure cylinder to the outrigger of the bridge girder erection machine, the top of the locking pressure cylinder is usually connected with the stand column or the steel cushion box. At this time, the device for injecting the medium can be arranged in the stand column or the steel cushion box, and the structural space of the outrigger of the bridge girder erection machine is reasonably utilized. The bottom of the locking pressure cylinder (i.e. the bottom of the piston rod 12) can be directly connected with the outrigger base. At this time, the height of the locking nut 16 is matched with the height of the human body, and it is convenient for the construction personnel to rotate the locking nut 16, and then it is convenient to complete the locking of the locking nut 16.

[0050] In one or more embodiments, the piston rod 12 is a hollow structure, and the bottom opening of the piston rod 12 is provided with a connecting seat 124 for connecting with the outrigger base. At this time, a relatively closed chamber is formed between the bottom end of the core rod 13, the inner wall of the piston rod 12 and the top end of the connecting seat 124. The volume of the chamber increases with the extension of the piston rod 12 and decreases with the retraction of the piston rod 12. Considering that the air in the chamber may interfere with the change of the volume of the chamber and then hinder the extension and retraction of the piston rod 12, the connecting piece is provided with a ventilation hole 125. One end of the ventilation hole 125 is open and communicates with the internal space of the piston rod 12, and the other end communicates with the outside, so that the gas in the chamber can enter and exit, which is convenient for the change of the volume of the chamber, and thus avoids or reduces the possibility of hindering the extension and retraction of the piston rod 12, and facilitates the extension and retraction of the piston rod 12.

[0051] In one or more embodiments, the top outside of the cylinder barrel 11 is provided with a connecting flange 112 for fixing the locking pressure cylinder in the outrigger.

[0052] Embodiment 2

[0053] As shown in Figure 3 A bridge girder erection machine, comprising an outrigger, wherein the outrigger is provided with the locking pressure cylinder 1 as any one of the embodiments 1.

[0054] By applying the locking pressure cylinder 1 to the outrigger of the bridge girder erection machine, the support height of the bridge girder erection machine can be adjusted to any position within the stroke range of the oil cylinder for locking, thereby completing the stepless adjustment of the working height of the outrigger of the bridge girder erection machine, and the adaptability to different bridge girder slopes is better.

[0055] Here, by rotating the locking nut 16 on the piston rod 12 of the locking pressure cylinder 1, the support leg working height can be locked, and it is no longer necessary to lock the support leg working height by frequently inserting and pulling out the pin shaft, thereby reducing the labor amount of workers and being more efficient; and accidents of the bridge erecting machine overturning caused by hydraulic oil cylinder failure can be avoided, which is beneficial to the stability of the whole bridge erecting machine structure and the safety of the bridge erecting construction.

[0056] In one or more embodiments, the support leg further comprises a column 2, a steel cushion box 3 and a support leg base 4, which are sequentially connected along the length direction of the support leg. Wherein, the steel cushion box 3 is connected with the cylinder barrel 11 through the connecting flange 112 outside the cylinder barrel 11, and the steel cushion box 3 is provided with related equipment for injecting medium into the first medium channel 141 and the second medium channel 151; the support leg base 4 is connected with the piston rod 12 through the connecting seat 124.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A steplessly adjustable locking ram characterized in that, The locking pressure cylinder comprises a cylinder barrel (11) and a piston rod (12), the cylinder barrel (11) and the piston rod (12) are in sliding fit; The piston rod (12) has a threaded segment (121), a lock nut (16) is threadedly connected to the threaded segment (121) at a position outside the cylinder barrel (11), and the lock nut (16) can abut against the cylinder barrel (11).

2. A steplessly adjustable locking ram as defined in claim 1, wherein The top end of the piston rod (12) is located inside the cylinder barrel (11), and the bottom end of the piston rod (12) is located outside the cylinder barrel (11); The locking pressure cylinder further comprises a core rod (13), the top end of the core rod (13) is located outside the cylinder barrel (11), and the bottom end of the core rod (13) is located inside the cylinder barrel (11) and the piston rod (12); The top end of the cylinder barrel (11), the inner wall of the cylinder barrel (11), the outer wall of the core rod (13), and the top end of the piston rod (12) cooperate to form a closed first movable chamber (14), the first movable chamber (14) is communicated with a first medium channel (141), when the first medium channel (141) injects working medium into the first movable chamber (14), the piston rod (12) can extend relative to the cylinder barrel (11); The bottom end of the core rod (13), the outer wall of the core rod (13), the top end of the piston rod (12), and the inner wall of the piston rod (12) cooperate to form a closed second movable chamber (15), the second movable chamber (15) is communicated with a second medium channel (151), when the second medium channel (151) injects working medium into the second movable chamber (15), the piston rod (12) can retract relative to the cylinder barrel (11).

3. A steplessly adjustable locking ram as defined in claim 2, wherein, The top end of the piston rod (12) is provided with a piston (122), and the piston (122) is sealed between the piston rod (12) and the cylinder barrel (11); The top end of the piston rod (12) is provided with a first sealing ring (123), and the bottom end of the core rod (13) is provided with a second sealing ring (131), the first sealing ring (123) and the second sealing ring (131) are sealed between the piston rod (12) and the core rod (13).

4. A steplessly adjustable locking ram as defined in claim 2 wherein, The bottom end of the cylinder barrel (11) is provided with a guide sleeve (111), the guide sleeve (111) is sleeved outside the threaded segment (121) of the piston rod (12), and the inner diameter of the guide sleeve (111) is adapted to the outer diameter of the threaded segment (121).

5. A steplessly adjustable locking ram as defined in claim 4, wherein, The inner wall of the guide sleeve (111) is a smooth circumferential surface.

6. A steplessly adjustable locking ram as defined in claim 5, wherein, The thread of the threaded segment (121) is a trapezoidal thread.

7. A steplessly adjustable locking ram as defined in claim 2 wherein, The first medium channel (141) is arranged at the top of the cylinder barrel (11), the top opening of the first medium channel (141) is located at the top end face of the cylinder barrel (11), and the bottom opening of the first medium channel (141) is communicated with the first movable chamber (14). The second medium channel (151) penetrates the core rod (13), the top opening of the second medium channel (151) is located at the top end face of the core rod (13), and the bottom opening of the second medium channel (151) communicates with the second movable chamber (15) from the bottom of the outer wall of the core rod (13).

8. A steplessly adjustable locking ram as defined in claim 2 wherein, The piston rod (12) is a hollow structure, the bottom opening of the piston rod (12) is provided with a connecting seat (124) for connecting with a leg base, a connecting piece is provided with a vent hole (125), one end of the vent hole (125) is open and communicates with the internal space of the piston rod (12), and the other end communicates with the outside; The top outer side of the cylinder barrel (11) is provided with a connecting flange (112).

9. A bridge-launching machine, characterized in that The leg is internally provided with the locking pressure cylinder (1) as claimed in any one of claims 1-8.

10. A bridge-wiring machine according to claim 9, wherein The leg further comprises a column (2), a steel cushion box (3) and a leg base (4), and the column (2), the steel cushion box (3), the locking pressure cylinder (1) and the leg base (4) are sequentially connected along the length direction of the leg.

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