Progressive cantilever beam front end self-jacking device

Abstract

The utility model discloses a progressive cantilever beam front end self-jacking device, which comprises jacking equipment, a jacking channel, a base, a pin shaft and a jacking section, the jacking equipment is vertically arranged at the top of the jacking channel, the jacking section is arranged in the jacking channel, the base is connected with the end part of the jacking section through the pin shaft, and the base is connected with the jacking section through the pin shaft. The jacking sections comprise a first jacking section and a plurality of second jacking sections, the first jacking section is of a hollow structure, the second jacking sections can be installed on the first jacking section, two first through holes are formed in the side walls of the two sides, close to the top end, of the first jacking section correspondingly, and the first through holes are communicated with the first jacking section. And a second through hole is formed in the side wall of the second jacking section. The second jacking section is arranged and tightly attached to the first jacking section, upward extension of the height of the first jacking section is achieved, and the problem that under the large-span condition, due to the fact that the jacking stroke of jacking equipment is limited, the guide beam cannot reach the target elevation is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of long-span bridge construction, in particular to a progressive cantilever beam front end self-lifting device. Background Art

[0002] When a bridge cantilever is pushed, a lifting device is usually installed at the front end as a measure for the piers or temporary piers on the front guide beam. However, when facing a large-span push, due to the deadweight and large span of the structure, the deflection of the front guide beam is often large, and a lifting device with a larger jacking distance is required. However, the jacking distance of conventional lifting equipment on the market is mostly within 1m, which is difficult to meet the needs of large-span bridge push. When using special lifting equipment to meet the jacking distance requirements, the following problems will be faced: ① There are very few domestic manufacturers that can design and produce large-span lifting equipment, and the cost of purchasing or renting is high; ② The deadweight and volume of the large-span lifting equipment will make it difficult to install the front-end lifting equipment of the guide beam, and the installation space requirements are high. In addition, the strengthening of the end structure and the increase of corresponding supporting facilities will increase the weight of the front end, which will further increase the deflection of the guide beam during push. Therefore, it is necessary to design a device with low deadweight, small space occupation, and large-span push. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the above-mentioned prior art and provides a progressive cantilever beam front end self-lifting device, the device is provided with a second lifting segment, and by closely attaching the second lifting segment to the first lifting segment, the upward extension of the height of the first lifting segment is achieved. When the lifting device remains unchanged, a plurality of second lifting segments are connected to the first lifting segment, and the guide beam is moved upward to a higher span under the push of the lifting device, thereby solving the problem that in the case of a large span, the bottom of the guide beam cannot reach the target elevation due to the limited lifting distance of the lifting device.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a progressive cantilever beam front end self-lifting device: including a lifting device, a lifting channel, a lifting segment, a base and a pin shaft, the lifting channel is a vertical channel, the lifting device is vertically arranged at the top of the lifting channel, the lifting segment is arranged in the lifting channel and the lifting device can push the lifting segment to move along the lifting channel, the base is connected to the end of the lifting segment away from the lifting device through a pin shaft, the lifting segment includes a first lifting segment and a second lifting segment, the first lifting segment The segment is a hollow structure, the width of the first lifting segment matches the width of the lifting channel, the number of the second lifting segments is multiple, the second lifting segment can be installed on the first lifting segment, two first through holes are respectively arranged on the side walls of the first lifting segment close to the top, and a distance is left between the two first through holes. The two first through holes on both sides of the first lifting segment are arranged along the length direction of the first lifting segment, and a second through hole is arranged on the side wall of the second lifting segment, and the inner diameter of the first through hole is the same as that of the second through hole.

[0005] Preferably, the lifting channel includes a first lifting side plate and a second lifting side plate, the first lifting side plate and the second lifting side plate are spaced apart, the interval between the first lifting side plate and the second lifting side plate is the width of the first lifting segment, the first lifting side plate and the second lifting side plate are both provided with two third through holes near the bottom, the two third through holes of the first lifting side plate are arranged along the height direction of the first lifting side plate, the two third through holes of the second lifting side plate are arranged along the height direction of the second lifting side plate, a distance is left between the two third through holes, the first lifting side plate is provided with a segment entrance near the lifting equipment, and the entrance height of the segment entrance matches the height of the second lifting segment.

[0006] Preferably, the base includes a bottom plate and a connecting plate, and the number of the connecting plates is multiple. The multiple connecting plates are arranged on the upper side of the bottom plate at intervals along the length direction of the bottom plate. Each of the connecting plates is provided with a fourth through hole, and the multiple fourth through holes have the same height. The pin shaft can pass through the multiple fourth through holes in the horizontal direction.

[0007] Preferably, a fifth through hole is provided at the end of the first lifting segment close to the base, and the pin passes through the fifth through hole and the fourth through hole respectively to connect the first lifting segment to the base.

[0008] Preferably, the jacking device is a hydraulic jack, and the jacking core of the jacking device can move downward along the jacking channel.

[0009] Preferably, the diameter of the jacking core of the jacking device is greater than the width of the first jacking segment.

[0010] Preferably, a pad is provided at the bottom of the base plate.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] 1. The utility model is provided with a second lifting segment, and by closely attaching the second lifting segment to the first lifting segment, the first lifting segment is extended upward in height. When the lifting device remains unchanged, a plurality of second lifting segments are connected to the first lifting segment, and the guide beam is moved upward to a higher span under the push of the lifting device, thereby solving the problem that in the case of a large span, the bottom of the guide beam cannot reach the target elevation due to the limited lifting distance of the lifting device.

[0013] 2. When the utility model realizes the jacking of the guide beam with a large span, the jacking equipment with a small jacking distance is still used, so that the equipment installation space requirement at the front end of the guide beam is reduced, thereby reducing the deadweight of the guide beam structure and the equipment, reducing the load at the front end of the guide beam, and reducing the degree of deformation of the guide beam structure.

[0014] 3. The utility model realizes large-span jacking of the guide beam through a jacking device with a small jacking distance, thereby avoiding the need to purchase or rent large-scale jacking equipment and reducing the cost of equipment use.

[0015] The present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the connection relationship between the utility model and the guide beam;

[0017] Figure 2 This is a structural schematic diagram of the jacking channel of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the base of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the second lifting segment of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the first lifting segment of the utility model.

[0021] Description of reference numerals:

[0022] 1—guide beam; 2—lifting equipment; 3—first lifting section;

[0023] 3-1—first through hole; 3-2—fifth through hole; 4—base;

[0024] 4-1—bottom plate; 4-2—connecting plate; 4-3—backing plate;

[0025] 4-4—fourth through hole; 5—pin shaft; 6—second jacking segment;

[0026] 6-1—second through hole; 7—lifting channel; 7-1—first lifting side plate;

[0027] 7-2—Second lifting side plate; 7-3—Third through hole; 7-4—Segment entrance;

[0028] 8—Pier top; 9—Guide beam bottom. DETAILED DESCRIPTION

[0029] like Figures 1 to 5 As shown, the utility model includes a lifting device 2, a lifting channel 7, a base 4, a pin 5 and a lifting segment. The lifting channel 7 is a vertical channel. The lifting device 2 is vertically arranged at the top of the lifting channel 7. The lifting segment is arranged in the lifting channel 7 and the lifting device 2 can push the lifting segment to move along the lifting channel 7. The base 4 is connected to the end of the lifting segment away from the lifting device 2 through the pin 5. The lifting segment includes a first lifting segment 3 and a second lifting segment 6. The first lifting segment 3 is a hollow structure. The width of the first lifting segment 3 is the same as that of the lifting segment 6. The width of the lifting channel 7 matches, the number of the second lifting segments 6 is multiple, the second lifting segment 6 can be installed on the first lifting segment 3, and two first through holes 3-1 are respectively arranged on the side walls of the first lifting segment 3 close to the top, and a distance is left between the two first through holes 3-1. The two first through holes 3-1 on both sides of the first lifting segment 3 are arranged along the length direction of the first lifting segment 3, and the second through hole 6-1 is arranged on the side wall of the second lifting segment 6, and the inner diameter of the first through hole 3-1 and the second through hole 6-1 is the same.

[0030] The jacking device of the present application is used to adjust the height of the front end of the guide beam 1. The jacking equipment 2 is installed on the front end of the guide beam 1. The jacking equipment 2 is located in the jacking channel 7. The jacking channel 7 extends from top to bottom along the height direction of the guide beam 1. The first jacking segment 3 is arranged in the jacking channel 7. The first jacking segment 3 is connected to the jacking channel 7 through the pin shaft 5. When the guide beam 1 drives the lifting device to reach the pier top 8, the lifting device 2 pushes the first lifting segment 3 to move downward along the lifting channel 7. When the base 4 at the bottom of the first lifting segment 3 is pressed against the pier top 8, and the bottom 9 of the guide beam has not reached the target elevation, the lifting device 2 is retracted, and the second lifting segment 6 is installed on the top of the first lifting segment 3. The second lifting segment 6 is pushed downward again by the lifting device 2. The reaction force generated thereby lifts the guide beam 1 upward. If the bottom 9 of the guide beam still does not reach the target elevation at this time, the lifting device 2 is retracted, and the second lifting segment 6 is continued to be installed on the current second lifting segment 6, or multiple second lifting segments 6 are simultaneously installed on the upper part of the current second lifting segment 6 along the height direction of the lifting channel 7, and the second lifting segment 6 is pushed downward again by the lifting device 2, so that the guide beam 1 moves upward under the reaction force of the second lifting segment 6 until the bottom 9 of the guide beam reaches the target elevation. The target elevation is a fixed value determined according to the project conditions.

[0031] The first lifting segment 3 is a hollow structure, and the two first through holes 3-1 on both sides of the first lifting segment 3 are symmetrically arranged, so that the pin 5 can horizontally pass through the first through holes 3-1 on both sides of the first lifting segment 3 to connect the first lifting segment 3 with the lifting channel 7. The pin 5 can pass through the second through hole 6-1 on the second lifting segment 6, and the second lifting segment 6 is connected to the lifting channel 7 through the pin 5.

[0032] Furthermore, a plurality of first through holes 3-1 may be arranged at intervals on the left and right sides of the first lifting segment 3 along the height direction of the first lifting segment 3, and the first through holes 3-1 on the left and right sides of the first lifting segment 3 are symmetrical. The first through holes 3-1 are arranged on the first lifting segment 3 along the height direction of the first lifting segment 3, so that any height of the first lifting segment 3 can be connected to the lifting channel 7 through the pin shaft 5.

[0033] The second lifting segment 6 is a square structure, and the size of the second lifting segment 6 matches the size of the lifting channel 7. The lifting channel 7 can limit the left and right movement of the second lifting segment 6 in the lifting channel. Under the push of the downward force of the lifting device 2, the second lifting segment 6 is tightly attached to the first lifting segment 3 or the second lifting segment 6 on the lower side to avoid displacement of the second lifting segment 6 in the horizontal square.

[0034] like Figure 2 , Figure 4 As shown, the lifting channel 7 includes a first lifting side plate 7-1 and a second lifting side plate 7-2, the first lifting side plate 7-1 and the second lifting side plate 7-2 are spaced apart, the interval between the first lifting side plate 7-1 and the second lifting side plate 7-2 is the width of the first lifting segment 3, the first lifting side plate 7-1 and the second lifting side plate 7-2 are each provided with two third through holes 7-3 near the bottom, the two third through holes 7-3 of the first lifting side plate 7-1 are arranged along the height direction of the first lifting side plate 7-1, the two third through holes 7-3 of the second lifting side plate 7-2 are arranged along the height direction of the second lifting side plate 7-2, a distance is left between the two third through holes 7-3, the first lifting side plate 7-1 is provided with a segment entrance 7-4 near the lifting device 2, and the entrance height of the segment entrance 7-4 matches the height of the second lifting segment 6.

[0035] The first lifting side plate 7-1 and the second lifting side plate 7-2 are both square plates. The first lifting side plate 7-1 is welded to the guide beam 1 along its length direction. The first lifting side plate 7-1 is perpendicular to the guide beam 1, and the height of the first lifting side plate 7-1 perpendicular to the guide beam 1 is greater than the thickness of the first lifting segment 3. The second lifting side plate 7-2 is welded to the guide beam 1 after being separated from the first lifting side plate 7-1 by the width of the first lifting segment 3. There is a lifting channel 7 between the first lifting side plate 7-1 and the second lifting side plate 7-2. The first lifting segment 3 can move downward along the lifting channel 7 under the action of the lifting device 2. Each third through hole 7-3 on the first lifting side plate 7-1 can find a third through hole 7-3 on the second lifting side plate 7-2 that is located at the same horizontal plane, so that when the first through holes 3-1 and the third through holes 7-3 on both sides of the first lifting segment 3 are located at the same horizontal plane, after the pin shaft 5 passes through the first through hole 3-1 and the third through hole 7-3 located at the same horizontal plane, the first lifting segment 3 remains at the current height.

[0036] If it is necessary to add a second lifting segment 6 into the lifting channel 7, the second lifting segment 6 is pushed into the lifting channel 7 through the segment entrance 7-4. The width of the second lifting segment 6 matches the width of the lifting channel 7. The first lifting side plate 7-1 and the second lifting side plate 7-2 on both sides of the lifting channel 7 can limit the displacement of the second lifting segment 6 in the lifting channel 7. The second lifting segment 6 slides downward along the lifting channel 7 until it contacts the top of the first lifting segment 3. At this time, the pin 5 on the first lifting segment 3 is taken out, and the lifting device 2 pushes the second lifting segment 6 to move downward. When the second through hole 6-1 on the second lifting segment 6 and the third through hole 7-3 on the first lifting side plate 7-1 are located at the same When the guide beam is on a horizontal plane, the pin 5 is inserted into the second through hole 6-1 and the third through hole 7-3. At this time, the second lifting segment 6 is connected to the first lifting side plate 7-1 and the second lifting side plate 7-2. According to the current height of the bottom 9 of the guide beam, it is determined whether to continue to put the second lifting segment 6 into the lifting channel 7 through the segment entrance 7-4. If it is necessary to continue to put the second lifting segment 6, the lifting device 2 is retracted, and after the second lifting segment 6 is put in, the pin 5 is taken out, and the second lifting segment 6 is pushed downward by the lifting device 2. The reaction force generated by the second lifting segment 6 pushes the guide beam 1 upward; if the bottom 9 of the guide beam has reached the target elevation, the lifting device 2 continues to tighten the second lifting segment 6 in contact with it.

[0037] Furthermore, the first lifting side plate 7-1 and the second lifting side plate 7-2 may be provided with a plurality of third through holes 7-3 at intervals along their height direction, so as to facilitate the first lifting side plate 7-1 and the second lifting side plate 7-2 to be connected to the first lifting segment 3 or the second lifting segment 6 respectively.

[0038] The segment entrance 7-4 is set at the bottom of the jacking device 2, so that after the jacking device 2 is folded, the second jacking segment 6 can be pushed into the jacking channel 7 through the segment entrance 7-4, avoiding the segment entrance 7-4 being set too high, so that the jacking device 2 hinders the second jacking segment 6 from being smoothly pushed into the jacking channel 7, or the segment entrance 7-4 being set too low, so that the first jacking segment 3 or the second jacking segment 6 in the jacking channel 7 hinders the second jacking segment 6 from being pushed into the jacking channel 7.

[0039] like Figure 3 As shown, the base 4 includes a bottom plate 4-1 and a connecting plate 4-2, and the number of the connecting plates 4-2 is multiple. The multiple connecting plates 4-2 are arranged on the upper side of the bottom plate 4-1 at intervals along the length direction of the bottom plate 4-1. Each connecting plate 4-2 is provided with a fourth through hole 4-4, and the multiple fourth through holes 4-4 have the same height. The pin shaft 5 can pass through the multiple fourth through holes 4-4 in the horizontal direction.

[0040] The connecting plate 4-2 can be an ear plate. A plurality of ear plates are arranged on the bottom plate 4-1, so that the force on the pin shaft 5 can be more uniform. The base 4 is connected to the bottom of the first lifting segment 3 through the ear plate. The lower end of the first lifting segment 3 is in a shape matching the ear plate, and the first lifting segment 3 is provided with fifth through holes 3-2 on both sides of the end away from the lifting device 2. After the pin shaft 5 passes through the fifth through holes 3-2 on both sides of the first lifting segment 3 and the fourth through hole 4-4 on the ear plate, the base 4 is connected to the first lifting segment 3.

[0041] In a possible embodiment, the connecting plate 4-2 can be a square plate (not shown in the figure), the width of the square plate is smaller than the width between the inner walls on both sides of the first lifting segment 3, and multiple square plates are arranged on the bottom plate 4-1 at intervals. The top of each square plate is provided with a through hole through which the pin shaft 5 can pass. The maximum distance between the square plates on both sides of the bottom plate 4-1 is smaller than the distance between the inner walls on both sides of the first lifting segment 3, which facilitates the installation of the base 4 on the first lifting segment 3 through the through holes on the square plates.

[0042] In another possible embodiment, the connecting plate 4-2 is a retractable plate (not shown in the figure), and buckles are provided on the side walls of the retractable plate. When the buckles on both sides of the retractable plate are pressed downward, the retractable plate extends outward by a fixed length, so that the height of the retractable plate increases, and the first lifting segment 3 connected to it through the pin 5 is lifted upward, and the guide beam 1 moves upward synchronously with the first lifting segment 3. When the buckles on both sides of the retractable plate are pressed, the retractable plate can be retracted inward, so that the height of the retractable plate decreases, and the first lifting segment 3 connected to the retractable plate through the pin 5 moves downward, and the guide beam 1 moves downward synchronously. Therefore, by setting the connecting plate 4-2 as a retractable plate, the lifting device 2 can be assisted to adjust the height of the guide beam 1.

[0043] like Figure 3 , Figure 5 As shown, a fifth through hole 3 - 2 is provided at the end of the first lifting segment 3 close to the base 4 , and the pin 5 passes through the fifth through hole 3 - 2 and the fourth through hole 4 - 4 respectively to connect the first lifting segment 3 with the base 4 .

[0044] The fifth through holes 3-2 at the two side ends of the first lifting segment 3 are symmetrically arranged. The pin 5 passes through the fifth through hole 3-2 on one side of the first lifting segment 3 and then passes through multiple fourth through holes 4-4, and finally passes through the fifth through hole 3-2 on the other side of the first lifting segment 3, so that the base 4 is connected to the first lifting segment 3.

[0045] In a possible embodiment, the first lifting segment 3 is provided with protrusions (not shown in the figure) on both side ends close to the base 4, and a connecting plate 4-2 is provided on both side ends of the bottom plate 4. The ends of the connecting plate 4-2 are provided with through holes matching the protrusions. After the two protrusions on both sides of the first lifting segment 3 pass through the through holes on the connecting plates 4-2 at both ends of the bottom plate 4, the base 4 is connected to the first lifting segment 3.

[0046] In another possible embodiment, through holes are respectively provided at both side ends of the first lifting segment 3 close to the base 4, and the pin 5 passes through the through holes on both sides of the first lifting segment 3. A fastener (not shown in the figure) is provided on the top of the connecting plate 4-2. The fastener is composed of two semicircular structures, and a threaded hole is provided on the top of the semicircular structure. The inner diameter of the fastener is consistent with the outer diameter of the pin 5. The pin 5 is placed in the fastener, and the bolt is screwed into the threaded hole to fasten the pin 5 and the fastener. The first lifting segment 3 can be connected to the base 4.

[0047] like Figure 1 , Figure 2 As shown, the jacking device 2 is a hydraulic jack, and the jacking core of the jacking device 2 can move downward along the jacking channel 7.

[0048] When the jacking core of the jacking device 2 moves downward, it pushes downward the first jacking segment 3 or the second jacking segment 6 close to the jacking device 2. Since the jacking distance of the jacking device 2 is limited, if the bottom 9 of the guide beam has not reached the target elevation after the jacking core of the jacking device 2 extends the maximum distance, the second jacking segment 6 is placed into the jacking channel 7 through the segment entrance 7-4, and the height of the jacking segment is extended by the second jacking segment 6. The jacking segment may include only one first jacking segment 3, or one first jacking segment 3 and one second jacking segment 6, or one first jacking segment 3 and at least two second jacking segments 6. By connecting multiple second jacking segments 6 on the upper side of the first jacking segment 3, the height of the jacking segment can be increased, so that the jacking device 2 can achieve a larger span of upward movement of the bottom 9 of the guide beam without changing the jacking distance.

[0049] like Figure 1As shown, the core diameter of the lifting device 2 is greater than the width of the first lifting segment 3 .

[0050] Since the lifting device 2 needs to push the first lifting segment 3 or the second lifting segment 6 downward, the top of the first lifting segment 3 is an upwardly open structure. If the diameter of the top core of the lifting device 2 is smaller than the width of the first lifting segment 3, the top core of the lifting device 2 will be embedded in the first lifting segment 3, affecting the downward extension length of the top core of the lifting device 2. Therefore, the diameter of the lifting device 2 should be larger than the width of the first lifting segment 3, but the diameter of the lifting device 2 should be smaller than the width of the lifting channel 7 between the first lifting side plate 7-1 and the second lifting side plate 7-2, so that the top core of the lifting device 2 can move up and down in the lifting channel 7.

[0051] like Figure 3 As shown, a pad 4-3 is provided at the bottom of the base plate 4-1.

[0052] A pad 4-3 is provided at the bottom of the bottom plate 4-1 to make the contact between the bottom plate 4-1 and the pier top 8 more stable, and to avoid incomplete contact between the bottom plate 4-1 and the pier top 8 due to the unevenness of the pier top 8 after the bottom plate 4-1 contacts the pier top 8, resulting in unstable support of the guide beam 1 by the first lifting segment 3.

[0053] When in use, the jacking device is installed to the front end of the guide beam 1. After the front end of the guide beam 1 slides to the pier top 8, the guide beam 1 stops horizontal movement, the distance between the bottom 9 of the guide beam and the target elevation is checked, the pin 5 in the first jacking segment 3 is taken out, and the jacking device 2 is started. The top core of the jacking device 2 pushes the first jacking segment 3 located in the jacking channel 7 downward. If the top core of the jacking device 2 extends to the maximum distance, the base 4 at the bottom of the first jacking segment 3 has contacted the pier top 8, but the bottom 9 of the guide beam has not reached the target elevation, the jacking device 2 retracts the top core and pushes it into the jacking channel 7 through the segment entrance 7-4. The second lifting segment 6 is pushed in, and the lifting device 2 pushes out the core again, pushing the second lifting segment 6 downward so that the bottom of the second lifting segment 6 is tightly attached to the top of the first lifting segment 3. When the lifting device 2 pushes the second lifting segment 6 downward, the guide beam 1 moves upward synchronously under the push of the reaction force. If the bottom 9 of the guide beam has not reached the target elevation at this time, the operation of placing the second lifting segment 6 continues until the bottom 9 of the guide beam reaches the target elevation. The core of the lifting device 2 continues to push down against the top of the first lifting segment 3 or the top of the second lifting segment 6, so that the bottom 9 of the guide beam remains at the target elevation. By placing multiple second lifting segments 6 at the top of the first lifting segment 3 along the height direction of the lifting channel 7, a lifting effect of a large lifting distance is achieved by a lifting device with a small lifting distance.

[0054] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A progressive cantilever beam front end self-lifting device, characterized in that: The invention comprises a lifting device (2), a lifting channel (7), a base (4), a pin (5) and a lifting segment, wherein the lifting channel (7) is a vertical channel, the lifting device (2) is vertically arranged at the top of the lifting channel (7), the lifting segment is arranged in the lifting channel (7) and the lifting device (2) can push the lifting segment to move along the lifting channel (7), the base (4) is connected to the end of the lifting segment away from the lifting device (2) through the pin (5), the lifting segment comprises a first lifting segment (3) and a second lifting segment (6), the first lifting segment (3) is a hollow structure, the width of the first lifting segment (3) is equal to the width of the lifting segment (6), and the lifting device (2) is connected to the lifting segment (7) through the pin (5). The width of the lifting channel (7) is matched, the number of the second lifting segments (6) is multiple, the second lifting segments (6) can be installed on the first lifting segment (3), two first through holes (3-1) are respectively arranged on the side walls of the first lifting segment (3) close to the top, and a distance is left between the two first through holes (3-1), the two first through holes (3-1) on both sides of the first lifting segment (3) are arranged along the length direction of the first lifting segment (3), and a second through hole (6-1) is arranged on the side wall of the second lifting segment (6), and the first through hole (3-1) and the second through hole (6-1) have the same inner diameter.

2. A progressive cantilever beam front end self-lifting device according to claim 1, characterized in that: The lifting channel (7) comprises a first lifting side plate (7-1) and a second lifting side plate (7-2), the first lifting side plate (7-1) and the second lifting side plate (7-2) are arranged at a distance, the distance between the first lifting side plate (7-1) and the second lifting side plate (7-2) is the width of the first lifting segment (3), the first lifting side plate (7-1) and the second lifting side plate (7-2) are each provided with two third through holes (7-3) near the bottom, the first lifting side plate (7-1) The two third through holes (7-3) are arranged along the height direction of the first lifting side plate (7-1), the two third through holes (7-3) of the second lifting side plate (7-2) are arranged along the height direction of the second lifting side plate (7-2), a distance is left between the two third through holes (7-3), and the first lifting side plate (7-1) is provided with a segment entrance (7-4) near the lifting device (2), and the entrance height of the segment entrance (7-4) matches the height of the second lifting segment (6).

3. A progressive cantilever beam front end self-lifting device according to claim 1, characterized in that: The base (4) comprises a bottom plate (4-1) and a connecting plate (4-2), the connecting plates (4-2) being multiple in number, the multiple connecting plates (4-2) being arranged at intervals on the upper side of the bottom plate (4-1) along the length direction of the bottom plate (4-1), each connecting plate (4-2) being provided with a fourth through hole (4-4), the multiple fourth through holes (4-4) having the same height, and the pin shaft (5) being able to pass through the multiple fourth through holes (4-4) in the horizontal direction.

4. A progressive cantilever beam front end self-lifting device according to claim 3, characterized in that: A fifth through hole (3-2) is provided at the end of the first lifting segment (3) close to the base (4), and the pin shaft (5) passes through the fifth through hole (3-2) and the fourth through hole (4-4) respectively to connect the first lifting segment (3) with the base (4).

5. A progressive cantilever beam front end self-lifting device according to claim 1, characterized in that: The jacking device (2) is a hydraulic jack, and the jacking core of the jacking device (2) can move downward along the jacking channel (7).

6. A progressive cantilever beam front end self-lifting device according to claim 1, characterized in that: The core diameter of the jacking device (2) is greater than the width of the first jacking segment (3).

7. A progressive cantilever beam front end self-lifting device according to claim 3, characterized in that: A pad (4-3) is provided at the bottom of the bottom plate (4-1).

Images