An adjustable steel support for the front legs of a bridge erecting machine

Abstract

The present invention provides an adjustable steel support for the front legs of a bridge-building machine, which relates to the technical field of bridge construction, and includes: a support mechanism; the support mechanism is a steel support body, the main body is a cylindrical structure, and a wedge-shaped protrusion is provided at the bottom of the main body; a fixing rod is installed on the top of the main body; an adjustment mechanism is installed on the top of the support mechanism, and the adjustment mechanism includes: a fixing rod is installed inside the threaded hole on the adjustment member; the fixing mechanism is installed on the support mechanism; a bearing mechanism is installed on the top of the adjustment mechanism; the bearing member is installed on the top of the adjustment member; by adjusting the rotating handle, the rotating handle drives the adjusting member to rotate, and then the adjusting member drives the side member and the bearing member to move upward, and then the top member and the bearing member are in contact with the bottom of the front legs of the bridge-building machine, thereby playing the role of replacing sleepers, better supporting the front legs, and solving the problem that the current traditional steel support cannot adjust the support according to the height of the front legs.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to an adjustable front leg steel support of a bridge erecting machine. Background Art

[0002] A bridge-building machine is a device that places prefabricated beams onto prefabricated piers. A bridge-building machine belongs to the category of cranes because its main function is to lift the beams, transport them to the location, and then put them down. When the bridge-building machine passes through a hole, its front legs need to be fixed and supported to maintain its stability, and this is when the device is needed. However, as far as current traditional steel supports are concerned, they are generally steel supports of fixed length. When in use, if the top of the steel support cannot contact the front legs, sleepers need to be used to fill them. This is not convenient to use, and the support cannot be adjusted according to the height of the front legs. While adjusting, the center of gravity of the support increases, and the auxiliary fixing structure of the steel support cannot be adjusted more conveniently. Moreover, when the existing steel support is in use, the force on the top of the steel support cannot be dispersed, and the supporting effect cannot be enhanced. In addition, when in use, there is a lack of auxiliary fixing structure between the top of the steel support and the bridge-building machine. Summary of the Invention

[0003] In view of this, the present invention provides an adjustable steel support for the front legs of a bridge-building machine, which has an adjusting mechanism and a fixing mechanism, so that the support can be adjusted according to the height of the front legs of the bridge-building machine, making it more convenient to use, reducing the problem that the height difference of traditional sleeper supports is difficult to adjust, and making installation and removal more convenient. In addition, when in use, the fixing mechanism can follow the movement as the center of gravity moves upward to better assist in fixing and supporting the steel support, making the support more firm and the structure more stable.

[0004] The present invention provides an adjustable steel support for the front legs of a bridge erecting machine, which specifically comprises: a supporting mechanism, an adjusting mechanism, a fixing mechanism and a bearing mechanism;

[0005] The supporting mechanism is a steel supporting body, and the supporting mechanism includes: a main body, the main body is a cylindrical structure, and a wedge-shaped protrusion is provided at the bottom of the main body; a fixing rod, the fixing rod is a cylindrical structure, a thread is provided on the fixing rod, and the fixing rod is installed on the top of the main body; the adjusting mechanism is installed on the top of the supporting mechanism, and the adjusting mechanism includes: an adjusting piece, the adjusting piece is a cylindrical structure, a wedge-shaped protrusion is provided on the top of the adjusting piece, a threaded hole is provided inside the adjusting piece, and a fixing rod is installed inside the threaded hole on the adjusting piece; the fixing mechanism is installed on the supporting mechanism, and the fixing piece on the fixing mechanism is installed on the main body; the bearing mechanism is installed on the top of the adjusting mechanism.

[0006] Optionally, the support mechanism further comprises: a chassis and a guide groove;

[0007] The chassis is a cylindrical structure and is installed at the bottom of the main body; the guide groove is a rectangular structure, there are four groups of guide grooves, and the guide grooves are opened on the inside and outside of the main body.

[0008] Optionally, the adjustment mechanism further comprises: a rotating handle and a side piece;

[0009] The rotating handle is a circular structure and is fixedly installed on the adjusting piece; the side piece is a rectangular structure, the side of the side piece is an arc structure, a circular hole is provided on the side piece, and the side piece is installed on both sides of the adjusting piece.

[0010] Optionally, the adjustment mechanism further comprises: a top member and a connecting member;

[0011] The top piece is a cylindrical structure, and there are two groups of top pieces. Cylindrical protrusions are provided on the upper and lower sides of the top piece, and the top piece is installed inside the circular hole on the side piece, and the cylindrical protrusion at the bottom of the top piece is connected to the bottom of the side piece through a spring; the connecting piece is a cylindrical structure with a protrusion at the bottom, and there are six groups of connecting pieces, and the connecting piece is installed at the bottom of the rotating handle.

[0012] Optionally, the fixing mechanism includes: a fixing member and a rotation slot;

[0013] The fixing piece is a circular ring structure, an arc-shaped protrusion is provided on the outside of the fixing piece, a rectangular protrusion is provided on the inner wall of the fixing piece, and the fixing piece is installed inside the guide groove through the rectangular protrusion; the rotating groove is a circular ring structure, and the rotating groove is opened at the top inside the fixing piece, and a connecting piece is installed inside the rotating groove.

[0014] Optionally, the fixing mechanism further comprises: a support member and a bottom member;

[0015] The support member is a cylindrical structure, with three groups of support members in total, and the support member is connected to the arc-shaped protrusion on the fixing member through a rotating shaft; the bottom member is a rectangular structure, the side of the bottom member is an arc-shaped structure, the top of the bottom member is a U-shaped structure, a threaded hole is provided on the bottom member, and the bottom member is installed at the bottom of the support member.

[0016] Optionally, the fixing mechanism further comprises: a rotating member and a contact member;

[0017] The rotating part is a cylindrical structure with a thread on it. There are three groups of rotating parts in total, and the rotating part is installed inside the threaded hole on the base part; the contact part is a rectangular structure with a wedge-shaped protrusion on the bottom of the contact part. There are three groups of contact parts in total, and the contact parts are installed at the bottom of the rotating part.

[0018] Optionally, the carrying mechanism includes: a carrying member and a slide groove;

[0019] The bearing member is a cylindrical structure and is installed on the top of the adjusting member; the slide groove is a rectangular structure, there are two groups of slide grooves, and the slide grooves are opened at the top of the inner part of the bearing member.

[0020] Optionally, the carrying mechanism further comprises: a sliding rod and a sliding member;

[0021] The sliding rod is a cylindrical structure, there are two groups of sliding rods, and the sliding rods are installed inside the slide groove; the sliding part is a rectangular structure, there are two groups of sliding parts, the top of the sliding part is a wedge-shaped structure, the bottom of the sliding part is provided with a rectangular protrusion, and the rectangular protrusion of the sliding part is provided with a circular hole. The sliding part is installed inside the slide groove through the bottom rectangular protrusion, and the sliding rod is installed inside the circular hole of the rectangular protrusion of the sliding part, and the rectangular protrusion of the sliding part is connected to the inner wall of the bearing part through a spring.

[0022] Beneficial effects

[0023] The steel supports according to the various embodiments of the present invention can be adjusted according to the actual height of the front legs of the bridge-building machine compared to traditional steel supports, so that the front legs can be better supported, the structure is stable, the use of sleepers is reduced, and resources are saved. In addition, when in use, the steel supports can be raised with the height and center of gravity, and the steel supports can be auxiliary fixed and supported as needed. When supporting, the force effect is better, and a certain supporting force can be dispersed through the top piece, so that the supporting effect is better. The steel support can be stably connected to the bridge-building machine and the ground through the fixing mechanism and the bearing mechanism, thereby ensuring fixed support for the front legs of the bridge-building machine.

[0024] In addition, by setting up a fixing rod and an adjusting piece, the fixing rod here is installed on the top of the main body, and the adjusting piece is connected to the internal fixing rod through a threaded hole provided inside, so that when in use, by adjusting the rotating handle, the rotating handle drives the adjusting piece to rotate, and the adjusting piece drives the side piece and the bearing piece to move upward, so that the top piece and the bearing piece contact the bottom of the front support leg of the bridge-building machine, thereby replacing the sleepers and better supporting the front legs.

[0025] In addition, by setting up side pieces and top pieces, the side pieces here are installed on both sides of the adjusting piece, and the top piece is installed inside the circular hole on the side piece, so that when in use, the top piece contacts the bottom of the front support leg, so that the top piece moves inside the circular hole on the side piece and stretches the spring, thereby dispersing the bearing force of a part of the supporting piece, and through the bearing action of the top piece and the supporting piece, the supporting effect can be enhanced, making the supporting effect better.

[0026] In addition, by providing the connecting member and the fixing member, the connecting member here is installed at the bottom of the rotating handle, and the fixing member is installed on the main body, so that when in use, the rotating handle is rotated and the connecting member is driven to rotate inside the rotating groove and rise with the rotating handle. At the same time, the connecting member drives the fixing member to rise, so that the fixing member moves upward inside the guide groove through the rectangular protrusion, so that the center of gravity of the support can be adjusted according to the height, so that the support effect on the front leg is better and the stability is stronger. By adjusting the rotating member, the rotating member drives the contact member at the bottom to rotate, and then the contact member contacts the ground. The wedge-shaped protrusion at the bottom of the contact member here can enhance the friction between the contact member and the ground when in contact with the ground, thereby enhancing the fixing effect.

[0027] In addition, by setting the supporting member and sliding member, the supporting member here is installed on the adjusting member, and the sliding member is installed inside the slide groove through the bottom rectangular protrusion, so that when in use, the supporting member here is set to be wider than the width of the front support leg, and as the supporting member rises, the top of the sliding member contacts the front support leg, and the top of the sliding member is set to a wedge-shaped structure, so that when in contact, the sliding member moves to both sides inside the slide groove through the bottom rectangular protrusion and compresses the spring on the sliding rod, so that the sliding member clamps both sides of the forelimb leg, and at the same time cooperates with the fixed structure to better support the front support leg. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0029] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0030] In the attached figure:

[0031] Figure 1 A schematic diagram showing a main-view stereoscopic structure according to an embodiment of the present invention is shown;

[0032] Figure 2 A schematic diagram of a bottom-view stereoscopic structure according to an embodiment of the present invention is shown;

[0033] Figure 3 A schematic diagram of a partially exploded three-dimensional structure according to an embodiment of the present invention is shown;

[0034] Figure 4 A schematic diagram showing a three-dimensional structure of a support mechanism according to an embodiment of the present invention is shown;

[0035] Figure 5 A schematic diagram showing an exploded three-dimensional structure of an adjustment mechanism according to an embodiment of the present invention is shown;

[0036] Figure 6 A schematic diagram showing an exploded three-dimensional structure of a fixing mechanism according to an embodiment of the present invention is shown;

[0037] Figure 7 A schematic diagram showing an exploded three-dimensional structure of a supporting mechanism according to an embodiment of the present invention is shown;

[0038] Figure 8 The embodiment of the present invention is shown. Figure 1 Schematic diagram of the local enlarged structure of part A.

[0039] Reference Signs List

[0040] 1. Support mechanism;

[0041] 101. Main body; 102. Chassis; 103. Fixing rod; 104. Guide groove;

[0042] 2. Adjustment mechanism;

[0043] 201, adjustment member; 202, rotary handle; 203, side member; 204, top member; 205, connecting member;

[0044] 3. Fixing mechanism;

[0045] 301, fixed part; 302, rotating groove; 303, supporting part; 304, bottom part; 305, rotating part; 306, contact part;

[0046] 4. Carrying mechanism;

[0047] 401, bearing member; 402, slide groove; 403, sliding rod; 404, sliding member. DETAILED DESCRIPTION

[0048] In order to make the purpose, scheme and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0049] Example: Please refer to Figures 1 to 8 :

[0050] The present invention proposes an adjustable front leg steel support for a bridge erection machine, comprising: a support mechanism 1, an adjustment mechanism 2, a fixing mechanism 3 and a bearing mechanism 4;

[0051] The support mechanism 1 is a steel support body, and the support mechanism 1 includes: a main body 101, the main body 101 is a cylindrical structure, and a wedge-shaped protrusion is provided at the bottom of the main body 101; the main body 101 here is a steel support body, and the wedge-shaped protrusion provided at the bottom of the main body 101 can enhance the supporting effect of the main body 101; a fixing rod 103, the fixing rod 103 is a cylindrical structure, a thread is provided on the fixing rod 103, and the fixing rod 103 is installed on the top of the main body 101; the adjustment mechanism 2 is installed on the top of the support mechanism 1, and the adjustment mechanism 2 includes: an adjustment member 201, an adjustment member 201 is a cylindrical structure, a wedge-shaped protrusion is provided on the top of the adjusting member 201, a threaded hole is provided inside the adjusting member 201, and a fixing rod 103 is installed inside the threaded hole on the adjusting member 201; the adjusting member 201 here is used to control the rotation of the rotating handle 202, thereby making the adjusting member 201 move upward on the fixing rod 103, so that the front support leg can be supported, which is more convenient to use; the fixing mechanism 3 is installed on the supporting mechanism 1, and the fixing member 301 on the fixing mechanism 3 is installed on the main body 101; the carrying mechanism 4 is installed on the top of the adjusting mechanism 2.

[0052] Furthermore, according to an embodiment of the present invention, Figure 4 As shown, the support mechanism 1 also includes: a chassis 102 and a guide groove 104; the chassis 102 is a cylindrical structure, and the chassis 102 is installed at the bottom of the main body 101; the chassis 102 here is used to contact the ground and play a bearing role for the main body 101; the guide groove 104 is a rectangular structure, and there are four groups of guide grooves 104, and the guide grooves 104 are opened on the inside and outside of the main body 101; the guide grooves 104 here are used to install the rectangular protrusions on the fixing member 301.

[0053] Furthermore, according to an embodiment of the present invention, Figure 5As shown, the adjustment mechanism 2 also includes: a rotating handle 202, a side piece 203, a top piece 204 and a connecting piece 205; the rotating handle 202 is a circular ring structure, and the rotating handle 202 is fixedly mounted on the adjusting piece 201; the rotating handle 202 here is used to rotate the adjusting piece 201 to move on the fixed rod 103, thereby achieving the effect of adjusting the height; the side piece 203 is a rectangular structure, the side of the side piece 203 is an arc-shaped structure, the side piece 203 is provided with a circular hole, and the side piece 203 is installed on both sides of the adjusting piece 201; the side piece 203 here is used to install the top piece 204; the top piece 204 is a cylindrical structure, and there are two groups of top pieces 204, with cylindrical protrusions on the upper and lower sides of the top piece 204, and the top piece 204 is installed on the side The top member 204 is used to move inside the circular hole on the side member 203 by contacting the bottom of the front support leg, and the cylindrical protrusion at the bottom of the top member 204 is connected to the bottom of the side member 203 through a spring; the top member 204 here is used to move inside the circular hole on the side member 203 and stretch the spring, which can disperse the gravity borne by the bearing member 401, thereby enhancing the supporting effect of the device; the connecting member 205 is a cylindrical structure with a protrusion at the bottom, and there are six groups of connecting members 205, and the connecting member 205 is installed at the bottom of the rotating handle 202; the connecting member 205 here is used to rotate inside the rotating groove 302, and also serves to connect the rotating handle 202 and the fixing member 301, so that when the adjusting member 201 rises, it can drive the fixing member 301 to move upward.

[0054] Furthermore, according to an embodiment of the present invention, Figure 6As shown, the fixing mechanism 3 includes: a fixing member 301, a rotating groove 302, a supporting member 303, a bottom member 304, a rotating member 305 and a contact member 306; the fixing member 301 is a circular ring structure, an arc-shaped protrusion is provided on the outer side of the fixing member 301, a rectangular protrusion is provided on the inner wall of the fixing member 301, and the fixing member 301 is installed inside the guide groove 104 through the rectangular protrusion; the fixing member 301 here is used to open the rotating groove 302, and the rectangular protrusion provided on the inner wall can be driven by the connecting member 205 to move upward in the guide groove 104 when the adjusting member 201 rises, thereby As the height increases, the center of gravity of the support is increased; the rotating groove 302 is a circular ring structure, and the rotating groove 302 is opened at the top of the fixing member 301, and a connecting member 205 is installed inside the rotating groove 302; the rotating groove 302 here is used to install the connecting member 205, so that when the rotating handle 202 rotates, the connecting member 205 rotates inside the rotating groove 302 and can drive the fixing member 301 to move upward; the support member 303 is a cylindrical structure, and there are three groups of support members 303, and the support members 303 are connected to the arc-shaped protrusions on the fixing member 301 through the rotating shaft; here The support member 303 is used to provide auxiliary support for the device; the bottom member 304 is a rectangular structure, the side of the bottom member 304 is an arc-shaped structure, the top of the bottom member 304 is a U-shaped structure, the bottom member 304 is provided with a threaded hole, and the bottom member 304 is installed at the bottom of the support member 303; the bottom member 304 here is used to install the rotating member 305 through the threaded hole; the rotating member 305 is a cylindrical structure, the rotating member 305 is provided with a thread, and there are three groups of rotating members 305, and the rotating member 305 is installed inside the threaded hole on the bottom member 304; the rotating member 305 here is used to thread the threaded hole on the bottom member 304 The internal rotation causes the contact member 306 to contact the ground, thereby achieving a better fixing effect on the main body 101; the contact member 306 is a rectangular structure, and a wedge-shaped protrusion is provided at the bottom of the contact member 306. There are three groups of contact members 306, and the contact members 306 are installed at the bottom of the rotating member 305; the contact member 306 here is used to rotate through the rotating member 305, thereby causing the contact member 306 to contact the ground, thereby achieving a fixing effect on the main body 101, and when the wedge-shaped protrusion provided at the bottom contacts the ground, it can increase the friction between the ground and achieve a better fixing effect.

[0055] Furthermore, according to an embodiment of the present invention, Figure 7As shown, the carrying mechanism 4 includes: a carrying member 401, a slide groove 402, a sliding rod 403 and a sliding member 404; the carrying member 401 is a cylindrical structure, and the carrying member 401 is installed on the top of the adjusting member 201; the carrying member 401 here is used to carry the front support leg, and the width of the carrying member 401 is set to be greater than the width of the bottom of the front support leg, which can ensure that the bearing member 401 has a better force effect; the slide groove 402 is a rectangular structure, and there are two groups of slide grooves 402, and the slide grooves 402 are opened at the top inside the carrying member 401; the slide groove 402 here is used to install the sliding rod 403 and the sliding member 404; the sliding rod 403 is a cylindrical structure, and there are two groups of sliding rods 403, and the sliding rod 403 is installed inside the slide groove 402; the sliding rod 403 here is used to assist in fixing the sliding member 404 The sliding member 404 is a rectangular structure, and there are two groups of sliding members 404. The top of the sliding member 404 is a wedge-shaped structure, and the bottom of the sliding member 404 is provided with a rectangular protrusion. A circular hole is provided on the rectangular protrusion of the sliding member 404, and the sliding member 404 is installed inside the sliding groove 402 through the rectangular protrusion at the bottom, and a sliding rod 403 is installed inside the circular hole of the rectangular protrusion of the sliding member 404, and the rectangular protrusion of the sliding member 404 is connected to the inner wall of the bearing member 401 through a spring; the sliding member 404 here is used to be set as a wedge-shaped structure at the top so that when it contacts the front support leg, it can move inside the sliding groove 402 and compress the spring on the sliding rod 403, thereby making the sliding member 404 move to both sides of the front support leg, thereby assisting the front support leg in positioning, and cooperating with the fixing mechanism 3 to achieve a better fixing effect.

[0056] Specific usage and function of this embodiment: In the present invention, when using this device, the main body 101 is placed at the bottom of the front support leg and contacts the ground through the chassis 102. By adjusting the rotating handle 202, the rotating handle 202 drives the adjusting member 201 to rotate, and then the adjusting member 201 drives the side member 203 and the supporting member 401 to move upward on the fixed rod 103, and contacts the bottom of the front support leg through the top member 204, so that the top member 204 moves inside the circular hole on the side member 203 and stretches the spring, thereby dispersing part of the bearing force of the supporting member 401, and as the supporting member 401 rises, the top of the sliding member 404 contacts the front support leg. The top of the sliding member 404 is set to a wedge-shaped structure, and then when in contact, the sliding member 404 moves to both sides inside the slide groove 402 through the bottom rectangular protrusion, and compresses the spring on the sliding rod 403, thereby causing the sliding member 404 to clamp both sides of the front leg, which can be used for the front support leg. The support member 301 is lifted up and the support member 302 is lifted up, so that the support member 301 is lifted up and the support member 301 is lifted up.

[0057] Finally, it should be noted that when describing the positions of various components and the matching relationships between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such positions, matching relationships, etc. are also applicable to other components / other pairs of components.

[0058] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. An adjustable front leg steel support for a bridge erection machine, characterized in that: include: A supporting mechanism (1), an adjusting mechanism (2), a fixing mechanism (3) and a bearing mechanism (4); The support mechanism (1) is a steel support body, and the support mechanism (1) comprises: a main body (101), the main body (101) is a cylindrical structure, and a wedge-shaped protrusion is provided at the bottom of the main body (101); a fixing rod (103), the fixing rod (103) is a cylindrical structure, a thread is provided on the fixing rod (103), and the fixing rod (103) is installed on the top of the main body (101); The support mechanism (1) further includes: a chassis (102) and a guide groove (104); The chassis (102) is a cylindrical structure, and the chassis (102) is installed at the bottom of the main body (101); the guide grooves (104) are rectangular structures, and there are four groups of guide grooves (104), and the guide grooves (104) are opened inside and outside the main body (101); The adjusting mechanism (2) is mounted on the top of the supporting mechanism (1), and the adjusting mechanism (2) comprises: an adjusting member (201), the adjusting member (201) being a cylindrical structure, a wedge-shaped protrusion being provided on the top of the adjusting member (201), a threaded hole being provided inside the adjusting member (201), and a fixing rod (103) being installed inside the threaded hole on the adjusting member (201); the fixing mechanism (3) is mounted on the supporting mechanism (1), and the fixing member (301) on the fixing mechanism (3) is mounted on the main body (101); the carrying mechanism (4) is mounted on the top of the adjusting mechanism (2); The adjustment mechanism (2) further comprises: a rotating handle (202) and a side piece (203); The rotating handle (202) is a circular ring structure, and the rotating handle (202) is fixedly mounted on the adjusting member (201); the side member (203) is a rectangular structure, the side of the side member (203) is an arc-shaped structure, a circular hole is provided on the side member (203), and the side member (203) is mounted on both sides of the adjusting member (201); The regulating mechanism (2) further comprises: a top member (204) and a connecting member (205); The top piece (204) is a cylindrical structure. There are two groups of top pieces (204). The top piece (204) is provided with cylindrical protrusions on the upper and lower sides. The top piece (204) is installed inside the circular hole on the side piece (203). The cylindrical protrusion at the bottom of the top piece (204) is connected to the bottom of the side piece (203) through a spring. The connecting piece (205) is a cylindrical structure with a protrusion at the bottom. There are six groups of connecting pieces (205) in total. The connecting piece (205) is installed at the bottom of the rotating handle (202). The fixing mechanism (3) comprises: a fixing member (301) and a rotating groove (302); The fixing member (301) is a circular ring structure, an arc-shaped protrusion is provided on the outer side of the fixing member (301), a rectangular protrusion is provided on the inner wall of the fixing member (301), and the fixing member (301) is installed inside the guide groove (104) through the rectangular protrusion; the rotating groove (302) is a circular ring structure, and the rotating groove (302) is opened at the top end inside the fixing member (301), and a connecting member (205) is installed inside the rotating groove (302).

2. The adjustable front leg steel support of a bridge erecting machine according to claim 1, characterized in that: The fixing mechanism (3) further comprises: a support member (303) and a bottom member (304); The support member (303) is a cylindrical structure. There are three groups of support members (303) in total. The support members (303) are connected to the arc-shaped protrusions on the fixing member (301) through a rotating shaft. The bottom member (304) is a rectangular structure. The side of the bottom member (304) is an arc-shaped structure. The top of the bottom member (304) is a U-shaped structure. The bottom member (304) is provided with a threaded hole. The bottom member (304) is installed at the bottom of the support member (303).

3. The adjustable front leg steel support of a bridge erecting machine according to claim 2, characterized in that: The fixing mechanism (3) further includes: a rotating member (305) and a contact member (306); The rotating member (305) is a cylindrical structure, and a thread is provided on the rotating member (305). There are three groups of rotating members (305), and the rotating members (305) are installed inside the threaded holes on the bottom member (304). The contact member (306) is a rectangular structure, and a wedge-shaped protrusion is provided on the bottom of the contact member (306). There are three groups of contact members (306), and the contact members (306) are installed on the bottom of the rotating member (305).

4. The adjustable front leg steel support of a bridge erecting machine according to claim 1, characterized in that: The bearing mechanism (4) comprises: a bearing member (401) and a sliding groove (402); The supporting member (401) is a cylindrical structure, and the supporting member (401) is installed on the top of the adjusting member (201); the sliding groove (402) is a rectangular structure, and there are two groups of sliding grooves (402), and the sliding grooves (402) are opened at the top of the inner part of the supporting member (401).

5. The adjustable front leg steel support of a bridge erecting machine according to claim 4, characterized in that: The carrying mechanism (4) further comprises: a sliding rod (403) and a sliding member (404); The sliding rod (403) is a cylindrical structure, and two groups of sliding rods (403) are provided. The sliding rods (403) are installed inside the sliding groove (402); the sliding member (404) is a rectangular structure, and two groups of sliding members (404) are provided. The top of the sliding member (404) is a wedge-shaped structure, and the bottom of the sliding member (404) is provided with a rectangular protrusion. The rectangular protrusion of the sliding member (404) is provided with a circular hole. The sliding member (404) is installed inside the sliding groove (402) through the rectangular protrusion at the bottom, and the sliding rod (403) is installed inside the circular hole of the rectangular protrusion of the sliding member (404), and the rectangular protrusion of the sliding member (404) is connected to the inner wall of the bearing member (401) through a spring.

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