Continuously adjustable locking pressure cylinder and bridge erection machine

Abstract

Continuously adjustable locking pressure cylinder, characterized in that it comprises a cylinder jacket (11) and a piston rod (12), the cylinder jacket (11) being in sliding connection with the piston rod (12); the piston rod (12) having a threaded portion (121); and a locking nut (16) being in a threaded connection with a position on the threaded portion (121) outside the cylinder jacket (11), and the locking nut (16) being in contact with the cylinder jacket (11).

Description

Technical area

[0001] The present invention relates to the technical field of bridge erection machine support, in particular to a continuously adjustable locking pressure cylinder and a bridge erection machine. State of the art

[0002] The support leg is one of the most important components of a bridge erection machine. Its function is to support the weight of the bridge erection machine or guide beam and transfer the structural load to the bridge pier or the erected girder bridge deck. During the erection process of the bridge erection machine, the horizontal position of the main beam or guide beam of the bridge erection machine must be adjusted by adjusting the height of the support leg to ensure the safety of the erection beam. The support legs generally adopt an inner and outer telescopic column structure and are usually equipped with a hydraulic oil cylinder with a piston rod to adjust the relative telescopic position of the inner and outer cylinders.The relative telescopic position of the inner and outer cylinder is locked by selecting the bolt with different hole positions, thereby blocking the support height of the support feet.

[0003] The outrigger of a bridge erecting machine with hydraulic cylinder adjustment and an inner and outer telescopic column bolt structure mainly has the following disadvantages. First, due to the fixed height adjustment for each time, usually about 200 mm, only step-by-step adjustment can be realized, but not stepless adjustment of the height of the outrigger, which makes it difficult to adapt to different beam inclinations. Second, during the operation of the bridge erecting machine, the bolt must be inserted and removed frequently. To prevent the bolt from falling, workers must also manually install a split pin as a fall protection device, which is also laborious. Summary of the utility model

[0004] The purpose of the present utility model is to provide a continuously adjustable locking pressure cylinder and a bridge erection machine by overcoming the technical problems of the prior art that when adjusting the height of the support leg of the bridge erection machine, only step-by-step adjustment with step-by-step change can be realized and stepless adjustment and change of the height of the support leg cannot be realized, which makes it difficult to adapt to the working conditions of beam erection with different inclinations.

[0005] In a first aspect, the present utility model provides a continuously adjustable locking pressure cylinder comprising a cylinder barrel and a piston rod, wherein the cylinder barrel is in sliding connection with the piston rod; wherein the piston rod has a threaded portion; and a lock nut is screwed to a position on the threaded portion outside the cylinder barrel, and the lock nut can bear against the cylinder barrel.

[0006] Optionally, an upper end of the piston rod is located inside the cylinder barrel and a lower end of the piston rod is located outside the cylinder barrel; wherein the locking pressure cylinder further comprises a core rod; an upper end of the core rod is located outside the cylinder shell; and a lower end of the core rod is located inside the cylinder shell and the piston rod; the upper end of the cylinder jacket, an inner wall of the cylinder jacket, an outer wall of the core rod, and the upper end of the piston rod cooperate to form a sealed first movable chamber, the first movable chamber communicating with a first medium channel; when the first medium channel injects a working medium into the first movable chamber, the piston rod can be extended relative to the cylinder jacket; the lower end of the core rod, the outer wall of the core rod, the upper end of the piston rod, and the inner wall of the piston rod cooperate to form a sealed second movable chamber, the second movable chamber communicating with a second medium channel; and when the second medium channel injects a working medium into the second movable chamber, the piston rod can be retracted relative to the interior of the cylinder jacket.

[0007] Optionally, a piston is provided outside the upper end of the piston rod, which is inserted between the piston rod and the cylinder jacket; a first sealing ring is arranged on the inside of the upper end of the piston rod; a second sealing ring is arranged on the outside of the lower end of the core rod; and the first sealing ring and the second sealing ring are inserted between the piston rod and the core rod.

[0008] wherein the piston cooperates with the first sealing ring to assist in sealing the first movable chamber, and the first sealing ring cooperates with the second sealing ring to assist in sealing the second movable chamber.

[0009] Optionally, a guide sleeve is provided inside the lower end of the cylinder barrel. The guide sleeve is encased outside the threaded portion of the piston rod, and the inner diameter of the guide sleeve is adapted to the outer diameter of the threaded portion. It guides the piston rod along a fixed path, prevents or reduces the deflection of the piston rod during the extension and retraction process, and ensures the support effect of the oil cylinder.

[0010] Optionally, the inner wall of the guide sleeve has a smooth circumferential surface.

[0011] Optionally, the thread of the threaded section is a trapezoidal thread.

[0012] Optionally, the first medium channel is arranged on the top side of the cylinder shell; an upper opening of the first medium channel is located on an upper end surface of the cylinder shell; a lower opening of the first medium channel communicates with the first movable chamber; the second medium channel extends through the core rod; an upper opening of the second medium channel is located on the upper end surface of the core rod; and a lower opening of the second medium channel communicates with the second movable chamber from the bottom side of the outer wall of the core rod.

[0013] Optionally, the piston rod is hollow; the lower opening of the piston rod is provided with a connecting seat for connecting with a support leg base; a connecting piece is provided with a vent hole; the opening at one end of the vent hole communicates with an inner space of the piston rod, and the other end thereof communicates with the outside; and a connecting flange is arranged on the outer side of the upper surface of the cylinder barrel.

[0014] In a second aspect, the present utility model provides a bridge erection machine comprising a support base in which a locking pressure cylinder according to one of the above-mentioned solutions is arranged.

[0015] Optionally, the support leg further comprises a post, a steel cushion container, and a support leg base; and the post, the steel cushion container, the locking pressure cylinder, and the support leg base are sequentially connected along the length of the support leg.

[0016] Compared to the prior art, the present utility model offers the following advantages. 1. The present utility model provides a continuously adjustable locking cylinder. The entire length of the locking cylinder is adjusted by sliding the piston rod relative to the cylinder barrel. When the locking cylinder is extended to the required length, the lock nut is rotated to move the lock nut on the threaded portion of the piston rod toward the cylinder barrel until the lock nut abuts the cylinder barrel. Based on this, the locking nut prevents the piston rod from retracting into the cylinder barrel, thereby achieving a mechanical locking of the length of the locking cylinder, thereby improving the stability of the locking cylinder in supporting the device.In addition, the lock nut can achieve mechanical locking of the length of the locking pressure cylinder when the locking pressure cylinder is extended to any length (within the stroke range of the cylinder), so that the supporting length of the locking pressure cylinder can be continuously adjusted and it can be used for supporting operations of a terrain with different heights. 2. The present utility model relates to a bridge erection machine. By arranging the locking pressure cylinder on the support leg of the bridge erection machine, the support height of the bridge erection machine can be adjusted to any position within the stroke range of the locking oil cylinder, thereby achieving continuous adjustment of the working height of the support leg of the bridge erection machine and achieving better adaptability to different beam erection inclinations. By turning the lock nut on the piston rod of the locking pressure cylinder, the working height of the support leg can be locked. It is no longer necessary to frequently insert and remove the pin bolt to secure the working height of the support leg, reducing the workload for workers and improving efficiency.In addition, tipping of the bridge erection machine due to failure of the hydraulic cylinder can be avoided, which benefits the stability of the entire structure of the bridge erection machine and the safety of the beam erection. Brief description of the drawings Fig. 1 is a schematic structural view of a first embodiment of the present utility model in the retracted state. Fig. 2 is a schematic structural view of the first embodiment of the present utility model in the extended state. Fig. 3 is a schematic structural view of a second embodiment of the present utility model. Reference symbol:

[0017] 1 - Locking pressure 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 channel; 15 - Second movable chamber; 151 - Second medium channel; 16 - Lock nut; 2 - Post; 3 - Steel cushion container; 4 - Support foot base. Detailed description

[0018] The present utility model will be described in more detail below using specific embodiments. However, the scope of the above-described subject matter of the present utility model is not limited to the following examples, and the present utility model is intended to fall within the scope of the present utility model.

[0019] In the description of the specific embodiments of the present utility model, the terms "top," "bottom," "left," "right," "center," "inside," "outside," and the like, when used, refer to any orientation or positional relationship unless otherwise specified, and are to be understood as expressions based on the orientation or positional relationship in the drawings or the orientation or positional relationship in which the product / device / equipment of the present utility model is commonly used. These terms for orientation or positional relationship are merely intended to facilitate the description of aspects of the present utility model or to simplify the description of specific embodiments for those skilled in the art so that they can quickly understand the aspects.They do not mean or imply that a particular device / part / element must have a particular orientation or be designed and operated in a particular positional relationship and are therefore not to be construed as a limitation of the present utility model.

[0020] Furthermore, the presence of the terms "horizontal," "vertical," "overhanging," "parallel," and the like does not mean that the respective device / component / element must be absolutely horizontal or vertical, or overhanging, or parallel, but that they may be slightly inclined or offset. Where "horizontal" simply means that the direction is more horizontal than "vertical," this does not mean that the structure must be completely horizontal, but that it may be slightly inclined. Alternatively, it can simply be assumed that the respective means / parts / elements arranged in a "horizontal," "vertical," "overhanging," "parallel" direction, etc., can be arranged with an error / deviation of ± 10%, preferably ± 8%, more preferably within ± 6%, more preferably within ± 5%, more preferably within ± 4% relative to the respective direction.As long as the corresponding device / part / element is within the error / deviation range, its function can continue to be fulfilled in the solution of the present utility model.

[0021] Furthermore, the terms "first," "second," "third," and the like in such expressions serve only to distinguish between descriptions of the same or similar elements and are not to be construed as emphasizing or implying a relative importance of the respective element...

[0022] Furthermore, in the description of the embodiments of the present utility model, "some," "a plurality," and "several" refer to at least two. It may be 2, 3, 4, 5, 6, 7, 8, 9, etc., and it may be more than 9.

[0023] Furthermore, in the description of the technical solution of the present utility model, unless expressly stated / restricted / limited otherwise, the terms "providing," "fastening," "connecting," "connected," "provided with," "laying," and "arranging" are to be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection, and it may be a connecting means commonly used in technology, such as welding, riveting, bolts, screws, etc. The connection may be a mechanical connection, an electrical connection, or a communication connection. They may be connected directly or indirectly via an intermediate medium, and there may be communication between the two elements. Embodiment 1

[0024] As in the Fig. 1 and Fig. As shown in Figure 2, a continuously adjustable locking pressure cylinder comprises a cylinder barrel 11 and a piston rod 12. The cylinder barrel 11 is in sliding connection with the piston rod 12. The piston rod 12 has a threaded portion 121 to which a lock nut 16 is screwed at a position outside the cylinder barrel 11. The lock nut 16 can bear against the cylinder barrel 11.

[0025] The overall length of the locking cylinder is adjusted by moving the piston rod 12 relative to the cylinder barrel 11. When the locking cylinder is extended to the required length, the lock nut 16 is rotated to move the lock nut 16 on the threaded portion of the piston rod 12 toward the cylinder barrel 11 until the lock nut 16 abuts the cylinder barrel 11. Based on this, the locking nut 16 prevents the piston rod 12 from retracting into the cylinder barrel 11, thereby achieving a mechanical locking of the length of the locking cylinder, thereby improving the stability of the locking cylinder when participating in supporting the device.In addition, the lock nut 16 can achieve mechanical locking of the length of the locking pressure cylinder when the locking pressure cylinder is extended to any length (within the stroke range of the cylinder), so that the supporting length of the locking pressure cylinder can be continuously adjusted and it can be used for supporting operations with a terrain of different heights.

[0026] In one or more embodiments, the upper end of the piston rod 12 is located inside the cylinder jacket 11, and the lower end of the piston rod 12 is arranged outside the cylinder jacket 11.

[0027] The locking pressure cylinder further comprises a core rod 13. The upper end of the core rod 13 is arranged outside the cylinder jacket 11, and the lower end of the core rod 13 is located inside the cylinder jacket 11 and the piston rod 12. The upper end of the cylinder jacket 11, the inner wall of the cylinder jacket 11, the outer wall of the core rod 13, and the upper end of the piston rod 12 together form a sealed first movable chamber 14. The first movable chamber 14 is connected to a first medium channel 141, which can be arranged on the cylinder jacket 11 or on the core rod 13 or on the piston rod 12, in order to realize the supply or discharge of the working medium into 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 be extended with respect to the cylinder jacket 11.At this time, the working medium in the second movable chamber 15 is discharged from the second medium channel 151.

[0028] The lower end of the core rod 13, the outer wall of the core rod 13, the upper end of the piston rod 12, and the inner wall of the piston rod 12 together form a sealed second movable chamber 15. The second movable chamber 15 communicates with a second medium passage 151, which may be arranged on the core rod 13 or the piston rod 12, to realize the supply or discharge of the working medium into or from the second movable chamber 15. When the second medium passage 151 injects the working medium into the second movable chamber 15, the piston rod 12 can be retracted relative to the cylinder barrel 11. At this time, the working medium in the first movable chamber 14 is ejected from the first medium passage 141.

[0029] The extension and retraction of the piston rod 12 with respect to the cylinder jacket 11 is achieved by the interaction of the first medium channel 141 and the second medium channel 151.

[0030] Experts know that the medium can be a gas or a liquid.

[0031] In one or more embodiments, a piston 122 is disposed outside the upper end of the piston rod 12, and the piston 122 is inserted between the piston rod 12 and the cylinder barrel 11. A first sealing ring 123 is provided on the inside of the upper end of the piston rod 12. A second sealing ring 131 is disposed on the outside of the lower end of the core rod 13. The first sealing ring 123 and the second sealing ring 131 are inserted between the piston rod 12 and the core rod 13.

[0032] Here, the piston 122 cooperates with the first sealing ring 123 to participate in sealing the first movable chamber 14, and the first sealing ring 123 cooperates with the second sealing ring 131 to participate in sealing the second movable chamber 15, thereby reducing or even preventing leakage of the medium from the first movable chamber 14 or the second movable chamber 15, which impairs the extension and retraction of the piston rod 12 and pollutes the environment around the locking pressure cylinder.

[0033] In one or more embodiments, the inside of the lower end of the cylinder jacket 11 is further provided with a guide sleeve 111, which is encased outside the threaded portion 121 of the piston rod 12. The inner diameter of the guide sleeve 111 is adapted to the outer diameter of the threaded portion 121. By guiding the piston rod 12 for movement along a fixed path through the interaction of the guide sleeve 111 and the piston 122, deflection of the piston rod 12 during extension and retraction is avoided or reduced, thereby ensuring the supporting effect of the oil cylinder.

[0034] At this time, a chamber 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 barrel 11, the volume of which decreases when the piston rod 12 is extended and increases when the piston rod 12 is retracted. It is expected that if the chamber is relatively tight, the air in the chamber may interfere with the volume changes of the chamber and thereby hinder the extension and retraction of the piston rod 12. Therefore, in one or more embodiments, the inner wall of the guide sleeve 111 may be provided with a smooth peripheral surface.

[0035] This facilitates the sliding of the piston rod 12 and the guide sleeve 111. At the same time, it is expedient to naturally form an air passage for gas into and out of the chamber between the inner wall of the guide sleeve 111 and the thread groove of the threaded portion 121 of the piston rod 12. It is expedient to change the volume of the chamber, thereby avoiding or reducing the possibility of obstructing the extension and retraction of the piston rod 12 and facilitating the expansion and contraction of the piston rod 12.

[0036] Here, the thread of the threaded portion 121 is preferably a trapezoidal thread, that is, the strength of the threaded portion 121 can be ensured and the mechanical locking strength of the locking pressure cylinder can be improved to ensure that the lock nut 16 can support the cylinder barrel 11 relatively stably. At the same time, the outermost surface of the trapezoidal thread is a circumferential surface that fits the inner wall of the guide sleeve 111, so that the contact between the threaded portion 121 and the inner wall of the guide sleeve 111 is surface contact, and the sliding of the threaded portion 121 of the piston rod 12 in the guide sleeve 111 is more stable.At the same time, the pressure of the contact surface is reduced when the threaded portion 121 and the inner wall of the guide sleeve 111 abut each other, thereby reducing the damage due to the pressing when the threaded portion 121 and the inner wall of the guide sleeve 111 abut each other, and improving the service life of the piston rod 12 and the guide sleeve 111.

[0037] In one or more embodiments, the first medium channel 141 is arranged on the upper side of the cylinder shell 11, wherein the upper opening of the first medium channel 141 is located on the upper end surface of the cylinder shell 11 and the lower opening of the first medium channel 141 is connected to the first movable chamber 14.

[0038] The second medium channel 151 passes through the core rod 13. The upper opening of the second medium channel 151 is located on the upper end surface of the core rod 13. The lower 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.

[0039] Here, the openings where the first medium channel 141 and the second medium channel 151 are exposed are located, and both are arranged on the top side of the locking pressure cylinder. When using the locking pressure cylinder, it is convenient to inject the medium evenly from the top side of the locking pressure cylinder through the first medium channel 141 and the second medium channel 151 into the corresponding movable chamber to complete the extension and retraction of the piston rod 12 of the locking pressure cylinder.

[0040] In the case where the locking pressure cylinder is mounted on the support leg of the bridge erection machine, the upper surface of the locking pressure cylinder is usually connected to the post or the steel cushion tank. At this time, the medium injection device can be arranged in the post or the steel cushion tank, and the structural space of the support leg of the bridge erection machine is rationally utilized. In addition, the lower surface of the locking pressure cylinder (ie, the lower surface of the piston rod 12) can be directly connected to the support leg base. At this time, the height of the lock nut 16 is relatively adjusted to the height of a human body to facilitate the construction personnel to rotate the lock nut 16 and thus facilitate the locking of the lock nut 16.

[0041] In one or more embodiments, the piston rod 12 is hollow, and the bottom opening of the piston rod 12 is provided with a connecting seat 124 for connecting to the support leg base. In this case, the lower end of the core rod 13, the inner wall of the piston rod 12, and the upper end of the connecting seat 124 together form a relatively sealed chamber whose volume increases as the piston rod 12 extends and decreases as the piston rod 12 retracts. It is understood that if the chamber is relatively sealed, the air in the chamber may interfere with the volume change of the chamber and thereby hinder the extension and retraction of the piston rod 12. Therefore, a vent opening 125 is arranged on the connecting piece.The opening at one end of the vent hole 125 communicates with an interior of the piston rod 12, and the other end communicates with the outside, so that the air can flow into and out of the chamber to facilitate the volume change of the chamber and avoid or reduce the possibility of obstructing the extension and retraction of the piston rod 12, thereby facilitating the extension and retraction of the piston rod 12.

[0042] In one or more embodiments, the upper outer side of the cylinder shell 11 is provided with a connecting flange 112 to secure the locking pressure cylinder in the support foot. Embodiment 2

[0043] As in Fig. 3, a bridge erection machine comprises a support leg in which a locking pressure cylinder 1 according to one of the embodiments 1 is arranged.

[0044] By applying the locking pressure cylinder to the support leg of the bridge erecting machine, the support height of the bridge erecting machine can be adjusted to any position within the stroke range of the locking oil cylinder, thereby achieving stepless adjustment of the working height of the support leg of the bridge erecting machine and achieving better adaptability to different beam erection inclinations.

[0045] Here, by turning the lock nut on the piston rod of the locking pressure cylinder, the working height of the support leg can be secured. It eliminates the need for frequent insertion and removal of the stud bolt to secure the working height of the support leg, reducing the workload for workers and improving efficiency. Furthermore, tipping of the bridge erection machine due to hydraulic cylinder failure can be avoided, which benefits the stability of the entire structure of the bridge erection machine and the safety of beam construction.

[0046] In one or more embodiments, the support foot further comprises a post 2, a steel cushion container 3, and a support foot base 4. The post 2, the steel cushion container 3, the locking pressure cylinder 1, and the support foot base 4 are connected sequentially along the length of the support foot. The steel cushion container 3 is connected to the cylinder shell 11 via a connecting flange 112 on the outside of the cylinder shell 11, and corresponding devices for introducing the medium into the first medium channel 141 and the second medium channel 151 are provided in the steel cushion container 3. The support foot base 4 is connected to the piston rod 12 via the connecting seat 124.

[0047] The foregoing are only preferred embodiments of the utility model and are not intended to limit the utility model. All modifications, equivalents, and improvements within the spirit and scope of the utility model are intended to be included within the scope of this utility model.

[0048] The present utility model relates to the technical field of bridge-building machine support, and more particularly to a continuously adjustable locking cylinder and a bridge-building machine. The locking cylinder comprises a cylinder barrel and a piston rod, the cylinder barrel being slidably connected to the piston rod; the piston rod having a threaded portion; and a lock nut is screwed to the cylinder barrel at a location outside the cylinder barrel, and the lock nut can abut against the cylinder barrel. The lock nut of the present utility model can achieve mechanical locking of the length of the locking cylinder when the locking cylinder is extended to any desired length, so that the support length of the locking cylinder can be continuously adjusted and can be used for support operations on terrain of different heights.

Claims

[1] Continuously adjustable locking pressure cylinder, characterized by , comprising a cylinder jacket (11) and a piston rod (12), wherein the cylinder jacket (11) is in sliding connection with the piston rod (12); wherein the piston rod (12) has a threaded portion (121); and a lock nut (16) is in a threaded connection with a position on the threaded portion (121) outside the cylinder jacket (11), and the lock nut (16) bears against the cylinder jacket (11). [2] Continuously adjustable locking pressure cylinder according to claim 1, characterized by that an upper end of the piston rod (12) is arranged inside the cylinder jacket (11) and a lower end of the piston rod (12) is arranged outside the cylinder jacket (11); wherein the locking pressure cylinder further comprises a core rod (13); an upper end of the core rod (13) is arranged outside the cylinder shell (11); and a lower end of the core rod (13) is arranged inside the cylinder shell (11) and the piston rod (12); the upper end of the cylinder jacket (11), an inner wall of the cylinder jacket (11), an outer wall of the core rod (13), and the upper end of the piston rod (12) cooperate to form a sealed first movable chamber (14), the first movable chamber (14) communicating with a first medium channel (141); when the first medium channel (141) injects a working medium into the first movable chamber (14), the piston rod (12) is extended relative to the cylinder jacket (11); the lower end of the core rod (13), the outer wall of the core rod (13), the upper end of the piston rod (12), and the inner wall of the piston rod (12) cooperate to form a sealed second movable chamber (15), the second movable chamber (15) communicating with a second medium channel (151); and when the second medium channel (151) injects a working medium into the second movable chamber (15), the piston rod (12) is retracted relative to the interior of the cylinder jacket (11). [3] Continuously adjustable locking pressure cylinder according to claim 2, characterized bythat a piston (122) is arranged outside the upper end of the piston rod (12), wherein the piston (122) is inserted between the piston rod (12) and the cylinder jacket (11); a first sealing ring (123) is arranged on the inside of the upper end of the piston rod (12); a second sealing ring (131) is arranged on the outside of the lower end of the core rod (13); and the first sealing ring (123) and the second sealing ring (131) are inserted between the piston rod (12) and the core rod (13). [4] Continuously adjustable locking pressure cylinder according to claim 2, characterized by that a guide sleeve (111) is arranged inside the lower end of the cylinder jacket (11); wherein the guide sleeve (111) is encased outside the threaded portion (121) of the piston rod (12); and the inner diameter of the guide sleeve (111) is adapted to the outer diameter of the threaded portion (121). [5] Continuously adjustable locking pressure cylinder according to claim 4, characterized by that the inner wall of the guide sleeve (111) has a smooth circumferential surface. [6] Continuously adjustable locking pressure cylinder according to claim 5, characterized by that the thread of the threaded sections (121) is a trapezoidal thread. [7] Continuously adjustable locking pressure cylinder according to claim 2, characterized bythat the first medium channel (141) is arranged on the upper side of the cylinder jacket (11); an upper opening of the first medium channel (141) is arranged on an upper end face of the cylinder jacket (11); a lower opening of the first medium channel (141) is connected to the first movable chamber (14); the second medium channel (151) extends through the core rod (13); an upper opening of the second medium channel (151) is arranged on the upper end face of the core rod (13); and a lower opening of the second medium channel (151) is connected to the second movable chamber (15) from the underside of the outer wall of the core rod (13). [8] Continuously adjustable locking pressure cylinder according to claim 2, characterized bythat the piston rod (12) has a hollow structure; the lower opening of the piston rod (12) is provided with a connecting seat (124) for connecting to a support foot base; a connecting piece with a vent opening (125) is provided; the opening at one end of the vent opening (125) is communicated with an interior of the piston rod (12), and the other end thereof is communicated with the outside; and a connecting flange (112) is provided on the outside of the top side of the cylinder jacket (11). [9] Bridge erection machine, characterized by that it comprises a support foot in which the locking pressure cylinder (1) according to one of claims 1 to 8 is provided. [10] Bridge erection machine according to claim 9, characterized bythat the support leg further comprises a post (2), a steel cushion container (3) and a support leg base (4); and the post (2), the steel cushion container (3), the locking pressure cylinder (1) and the support leg base (4) are connected sequentially along the length of the support leg.

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