Railway simply-supported T-beam replacing machine under operation condition

Abstract

The invention provides a beam replacing machine for dismantling and replacing a railway simply-supported T-beam under the railway operation condition, and the beam replacing machine is characterized in that a main beam is provided with two crane carriages which are mounted on the main beam and move along the main beam; the number of the main supporting legs is two, the main supporting legs comprise two C-shaped half supporting legs, the tops of the two half supporting legs are hinged to the left side and the right side of the main beam respectively, and the two half supporting legs can be driven by the folding mechanism to horizontally rotate till the two half supporting legs are folded with the main beam; telescopic stand columns are arranged in the two half supporting legs; the left sides and the right sides of the two walking wheel sets are hinged to the bottoms of the two C-shaped half supporting legs correspondingly, and the walking wheel sets are used for driving the whole beam changing machine to walk. The number of the auxiliary supporting legs is two, and the auxiliary supporting legs are provided with overturning mechanisms used for controlling the auxiliary supporting legs to be integrally and vertically overturned to be parallel to the main beam and lifting mechanisms used for controlling the auxiliary supporting legs to be integrally lifted up and down. The beam replacing device has the advantages of simple structure, convenience in operation, short beam replacing construction period and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a beam replacing machine for dismantling and replacing damaged and aged railway simply supported T beams under railway operating conditions. Background Art

[0002] In recent years, with the rapid development of high-speed rail construction technology in my country, the mileage of high-speed railways in operation and under construction has increased rapidly. As of now, the total mileage of high-speed railways in my country has reached 46,000 kilometers. However, conventional railways, due to their early construction and long operating cycles, still dominate rail passenger transport in my country. Currently, the operating mileage of conventional railways in my country is approximately 107,000 kilometers, far exceeding the total mileage of high-speed railways. Bridges account for a significant proportion of railway lines and are the backbone of railway construction. Simply supported beams 32 meters or less account for nearly 26% of conventional railways. Due to a variety of factors, including design quality, construction conditions, operation and maintenance environment, and service life, some older concrete T-beams in my country are experiencing cracks, corrosion, and aging problems. Their strength and stiffness no longer meet transportation requirements, necessitating urgent replacement. Research is urgently needed on construction techniques and complete sets of equipment for replacement under operational conditions. This is why railway simply supported T-beam replacement machines have emerged.

[0003] The existing methods for replacing existing railway bridges in my country mainly include the transverse movement method, gantry crane method, automobile crane method and bridge erection machine method. The above methods require the closure of the line and interruption of traffic during construction, and are also heavily dependent on on-site conditions. Considering factors such as the construction environment and cycle, the existing beam replacement equipment and technology in beam replacement projects are difficult to meet on-site construction needs. How to minimize the impact on railway operations and ensure the safety, reliability and speed of beam replacement construction requires the urgent study of beam replacement construction technology and complete sets of construction equipment under operating conditions. However, there is currently no dedicated beam replacement machine in this field that can use the window period to replace railway simply supported T-beams under operating conditions. Summary of the Invention

[0004] In order to solve the shortcomings of traditional beam replacement devices, the present invention provides a beam replacement machine for dismantling and replacing damaged and aged railway simply supported T-beams under railway operating conditions. It adopts the methods of complete disassembly, assembly and self-propelled operation, and can realize rapid transportation and rapid construction on existing lines. It has the advantages of simple structure, convenient operation and short beam replacement construction period.

[0005] The technical solutions adopted to achieve the above-mentioned purpose of the present invention are:

[0006] A railway simply supported T-beam replacement machine under operating conditions comprises at least a main beam and a power system, an electro-hydraulic control system and a driver's cab installed on the main beam, wherein the main beam is provided with:

[0007] There are two lifting trolleys installed on the main beam and moving along the main beam;

[0008] There are two main legs, which are connected to the front and rear sections of the main beam respectively. The main legs are in the shape of a "mouth" and include two C-shaped half legs. The tops of the two half legs are hinged to the left and right sides of the main beam respectively, and the two half legs can be rotated horizontally to fold with the main beam under the drive of the folding mechanism; both half legs are provided with telescopic columns;

[0009] There are two running wheel groups, including a running frame and a running wheel. The left and right sides of the running frame are respectively hinged to the bottom of the two C-shaped half legs. The running wheel is installed under the running frame. The running wheel group is used to drive the whole beam changing machine to travel;

[0010] There are two auxiliary legs, which are respectively connected to the front and rear sections of the main beam and are located on the outside of the two main legs. The auxiliary legs are provided with a flipping mechanism for controlling the overall vertical flipping of the auxiliary legs to be parallel to the main beam, and a lifting mechanism for controlling the overall up and down lifting of the auxiliary legs.

[0011] Furthermore, the main beam adopts a single-beam box-type structure, and the single main beam is divided into 4 sections. Each section is a welded box-type structure, and the sections are connected with high-strength bolts; the side of the lower cover plate of the main beam is provided with a track for the movement of the lifting trolley, and the top of the ear beam of the main beam is provided with a track for the movement of the lifting trolley.

[0012] Furthermore, the semi-support leg includes a first main beam connecting seat, an upper cross beam, a telescopic column and a lower cross beam. The first main beam connecting seat is fixed to the side surface of the upper part of the main beam by bolts. The upper cross beam is hinged to the first main beam connecting seat through a vertical pin shaft. The telescopic column is connected between the upper cross beam and the lower cross beam. The telescopic column includes an outer column and an inner column, and a telescopic cylinder is installed between the two. The lower cross beam is hinged to the running frame through a vertical pin shaft.

[0013] Furthermore, the folding mechanism includes a folding cylinder, which is installed between the upper crossbeam and the first main beam connecting seat.

[0014] Furthermore, the inner columns are evenly provided with latch holes from top to bottom, and the bottoms of the outer columns are also correspondingly provided with latch holes, and latches are provided in the latch holes.

[0015] Furthermore, the auxiliary support leg is composed of two single legs, which are respectively fixed on the left and right sides of the main beam. The single leg includes a second main beam connecting seat, a lifting column and a support seat. The second main beam connecting seat is fixed to the side surface of the upper part of the main beam by bolts. The top end of the lifting column is hinged to the second main beam connecting seat through a horizontal pin shaft, and the bottom end of the lifting column is connected and fixed to the support seat.

[0016] Furthermore, the lifting mechanism includes a lifting cylinder, both ends of which are respectively connected to the inside of the lifting column, and the lifting and lowering control of the lifting cylinder assists the overall lifting of the supporting legs.

[0017] Furthermore, the flip mechanism includes an upper flip seat, a lower flip seat and a flip cylinder. The upper flip seat is fixedly connected to the second main beam connecting seat, and the lower flip seat is fixedly connected to the lifting column. The top end of the flip cylinder is hinged to the upper flip seat, and the bottom end is hinged to the lower flip seat.

[0018] Furthermore, the hoisting trolley adopts a suspended structure, and the entire suspension is set on the ear beam at the lower part of the main beam, and the hoisting trolley is located at the lower part of the main beam as a whole, and the top height of the hoisting trolley is lower than the height after the auxiliary support legs are flipped.

[0019] Furthermore, the hoisting trolley is equipped with two hoisting mechanisms, which are symmetrically distributed on the left and right sides of the main beam. The steel wire ropes in the two hoisting mechanisms are connected to a sling by a balanced winding and threading method.

[0020] The present invention has the following beneficial effects compared to the prior art:

[0021] 1. The railway simply supported T-beam replacement machine provided by the present invention, under operational conditions, uses self-propelled movement from the beam yard along the existing rails to the beam section that needs to be replaced. After the beam replacement is completed, it returns to the beam yard or the next construction site by self-propelled movement. The entire machine is in a low position during the traveling and transporting process and in a high position during the beam replacement process. A simple high / low position switch (achieved by extending and retracting the main legs) can be used to switch between traveling and beam replacement working conditions, thereby improving construction efficiency.

[0022] 2. The main support legs in the present invention are generally in the shape of a "mouth", and their internal width is greater than the width of a single-section simply supported T-beam of railway. Therefore, the width of the main support legs is relatively large. If there is a tunnel between the beam yard and the construction site, the two C-shaped half legs are folded inward by a folding mechanism to make them parallel to the main beam. The width of the main support legs can be greatly reduced by folding, so that the entire beam changing machine can pass through the tunnel smoothly.

[0023] 3. The present invention is provided with a flippable auxiliary support leg. The auxiliary support leg can be flipped vertically as a whole to be parallel to the main beam under the action of the flipping mechanism, and can also be lifted up and down as a whole under the action of the lifting mechanism. The main function of the auxiliary support leg is to support the entire beam-changing machine during the extension and retraction process of the main support leg (i.e., high / low position switching) and the folding process of the main support leg; during the self-propelled movement of the beam-changing machine and the beam-changing process, the auxiliary support leg is in a flipped state as a whole, and the height of the flipped auxiliary support leg is higher than the top height of the lifting trolley, so it has no effect on the forward and backward movement of the lifting trolley along the main beam during the beam-changing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the railway simply supported T-beam replacement machine provided by the present invention (beam replacement state);

[0025] Figure 2 This is a schematic diagram of the overall structure of the railway simply supported T-beam replacing machine provided by the present invention (in running state);

[0026] Figure 3 This is a schematic diagram of the overall structure of the railway simply supported T-beam replacement machine provided by the present invention (in tunnel passing state);

[0027] Figure 4 This is a side view of the overall structure of the railway simply supported T-beam replacement machine provided by the present invention (beam replacement state);

[0028] Figure 5 This is a side view of the overall structure of the railway simply supported T-beam replacing machine provided by the present invention (in running state);

[0029] Figure 6 This is a side view of the overall structure of the railway simply supported T-beam replacement machine provided by the present invention (in tunnel passing state);

[0030] Figure 7 It is a schematic diagram of the overall structure of the main legs in the beam replacement state;

[0031] Figure 8 This is a schematic diagram of the overall structure of the main support leg in the tunnel passing state;

[0032] Figure 9 It is a schematic diagram of the overall structure of the auxiliary legs in the supporting state;

[0033] Figure 10 It is a side view of the overall structure of the auxiliary legs in the supporting state;

[0034] Figure 11 The figure is a schematic diagram of the overall structure of the lifting trolley;

[0035] Figure 12 Flowchart of the beam replacement construction step S1 of the railway simply supported T-beam replacement machine provided by the present invention;

[0036] Figure 13 Flowchart of the beam replacement construction step S2 of the railway simply supported T-beam replacement machine provided by the present invention;

[0037] Figure 14 Flowchart of the beam replacement construction step S3 of the railway simply supported T-beam replacement machine provided by the present invention;

[0038] Figure 15 Flowchart of the beam replacement construction step S4 of the railway simply supported T-beam replacement machine provided by the present invention;

[0039] Figure 16Flowchart of beam replacement construction step S5 of the railway simply supported T-beam replacement machine provided by the present invention;

[0040] Figure 17 Flowchart of beam replacement construction step S6 of the railway simply supported T-beam replacement machine provided by the present invention;

[0041] Figure 18 Flowchart of beam replacement construction step S7 of the railway simply supported T-beam replacement machine provided by the present invention;

[0042] Figure 19 Flowchart of beam replacement construction step S8 of the railway simply supported T-beam replacement machine provided by the present invention;

[0043] In the figure: 1-main beam, 11-lower cover plate, 12-side web, 13-ear beam, 2-hoisting trolley, 21-winch mechanism, 22-wire rope, 23-sling, 3-main support leg, 31-first main beam connecting seat, 32-upper crossbeam, 33-telescopic column, 331-outer column, 332-inner column, 333-telescopic cylinder, 334-pin hole, 335-pin, 34-lower crossbeam, 35-vertical pin shaft, 4-traveling wheel group, 41-traveling frame, 42-traveling wheel, 5-auxiliary support leg, 51-second main beam connecting seat, 52-lifting column, 53-support seat, 54-horizontal pin shaft, 55-lifting cylinder, 56-upper flip seat, 57-lower flip seat, 58-flip cylinder, 6-beam transporter, 7-simply supported T beam. DETAILED DESCRIPTION

[0044] The present invention will be further described below with reference to the accompanying drawings and examples.

[0045] The overall structure of a railway simply supported T-beam replacement machine under an operating condition provided in this embodiment is as follows: Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 、 Figure 2 and Figure 3 They correspond to the beam replacement state, running state and tunnel passing state respectively. Figure 2 and Figure 3 Since the auxiliary legs are in a flipped state, they are not drawn in the figure.

[0046] Main beam 1 is the main bearing structure of the beam changing machine, refer to Figure 1 as well as Figure 10The main beam 1 adopts a single-beam box-type structure. The single main beam is divided into four segments, each of which is a welded box-type structure. The segments are connected with 10.9-grade high-strength bolts. The two segments at the two ends are pre-arched upward, while the two middle segments are not pre-arched. The lower cover plate 11 of the main beam 1 is provided with a track for the movement of the lifting trolley 2. The side web 12 of the main beam 1 is provided with a track for the movement of the lifting trolley 2 above the ear beam 13. The main beam 1 is also equipped with a power system, an electro-hydraulic control system, and a driver's cab. These modules are conventional designs in this field and will not be elaborated in detail in this embodiment. They are not shown in the accompanying drawings.

[0047] There are two lifting trolleys 2 at the front and rear. Figure 4 as well as Figure 11 The trolley 2 is mounted on the main beam 1 and moves along the main beam. The trolley 2 adopts a suspended structure and is entirely suspended on the ear beam 13 at the lower part of the main beam. The trolley 2 is located at the lower part of the main beam 1, and the top height of the trolley 2 is lower than the height of the auxiliary support legs 5 after flipping. The trolley 2 is equipped with two hoisting mechanisms 21, which are symmetrically distributed on the left and right sides of the main beam 1. The wire ropes 22 in the two hoisting mechanisms 21 are connected to a sling 23 using a balanced winding and threading method.

[0048] When the bridge crane is in operation, two hoisting trolleys jointly lift a T-beam, with a total of four lifting points. The hoisting mechanisms 21 on the front and rear hoisting trolleys are both balanced lifting point mechanisms, using a balanced winding and threading method: the two ends of a wire rope emerge from the two sides of the double drum, enter their respective movable and fixed pulleys, and are then wound together through the left and right balanced pulleys, so that the forces on the left and right pulleys are balanced, forming a balanced lifting point. The symmetrical sides of the hoisting trolleys also use the same arrangement and winding method. Due to the use of the same structure and the addition of a frequency converter, the wire ropes on the same hoisting trolley are guaranteed to be lowered or raised synchronously, thus ensuring the balanced lifting and lowering of the sling. The hoisting mechanism 21 is driven by an electric motor, which drives the coupling, gearbox, and built-in planetary gear reducer to drive the drum with the wire rope. By controlling the forward and reverse rotation of the motor, the T-beam can be raised and lowered. Figure 11 The front view shows the winch mechanism. The winch drums have spiral grooves that provide a regular arrangement of the ropes. The grooves on the two hoist trolley drums are manufactured and installed with symmetrical rotation. The grooves on both sides of the same double drum are also symmetrical. Each double drum has a rope capacity of 142 meters, with four ropes in total.

[0049] Structural reference of main leg 3 Figure 1 、 Figure 4 as well as Figure 7 and Figure 8There are two main legs 3, connected to the front and rear sections of the main beam 1, respectively. The main legs 3 are shaped like a "mouth" and comprise two C-shaped half legs. The tops of the two half legs are hinged to the left and right sides of the main beam, respectively. The two half legs can be driven by a folding mechanism to rotate horizontally until they fold with the main beam. Each half leg is provided with a telescopic column 33. The half leg comprises a first main beam connecting seat 31, an upper crossbeam 32, a telescopic column 33, and a lower crossbeam 34. The first main beam connecting seat 31 is fixed to the side surface of the upper portion of the main beam by bolts. The upper crossbeam 32 is hinged to the first main beam connecting seat 31 via a vertical pin 35. The telescopic column 33 is connected between the upper crossbeam 32 and the lower crossbeam 34. The telescopic column 33 comprises an outer column 331 and an inner column 332, with a telescopic cylinder 333 installed between the two. The lower crossbeam 34 is hinged to the running frame 41 via a vertical pin 35. The folding mechanism includes a folding cylinder (not shown) mounted between the upper crossbeam 32 and the first main beam connector 31. The inner columns 332 are evenly spaced from top to bottom with latch holes 334. Corresponding latch holes 334 are also located at the bottom of the outer columns 331. Latch holes 335 are located in these holes. The inner columns 332 extend and retract within the outer columns 331 and are locked / unlocked by latches 335. To adjust the height of the main legs, the latch is removed, and the telescopic cylinder drives the legs to extend and retract. Once the height adjustment is complete, the latch is immediately inserted, locking the inner and outer columns.

[0050] The structure of the running wheel group 4 is referenced Figure 4 and Figure 7 As shown, there are also two running wheel groups 4, which include a running frame 41 and running wheels 42. The left and right sides of the running frame 41 are respectively hinged to the bottom of the two C-shaped half legs, and the running wheels 42 are installed under the running frame 41. The running wheel group 4 is used to drive the entire beam changing machine to run.

[0051] Structural reference of auxiliary leg 5 Figure 1 、 Figure 9 and Figure 10As shown, there are two auxiliary legs 5, connected to the front and rear sections of the main beam and located outside the two main legs 3. The auxiliary legs 5 are provided with a tilting mechanism for controlling the vertical tilting of the auxiliary legs as a whole to be parallel to the main beam, as well as a lifting mechanism for controlling the vertical lifting of the auxiliary legs as a whole. The auxiliary legs 5 are composed of two single legs, which are fixed to the left and right sides of the main beam 1 respectively. The single legs include a second main beam connecting seat 51, a lifting column 52, and a support seat 53. The second main beam connecting seat 51 is fixed to the side surface of the upper part of the main beam by bolts. The top end of the lifting column 52 is hinged to the second main beam connecting seat 51 by a horizontal pin 54, and the bottom end of the lifting column 52 is connected and fixed to the support seat 53. The lifting mechanism includes a lifting cylinder 55, the two ends of which are respectively connected to the interior of the lifting column 52. The lifting of the lifting cylinder 55 controls the overall lifting of the auxiliary legs 5. The flip mechanism includes an upper flip seat 56, a lower flip seat 57 and a flip cylinder 58. The upper flip seat 56 is fixedly connected to the second main beam connecting seat 51, and the lower flip seat 57 is fixedly connected to the lifting column 52. The top end of the flip cylinder 58 is hinged to the upper flip seat 56, and the bottom end is hinged to the lower flip seat 57.

[0052] The working steps of the railway simply supported T-beam replacement machine under the operating conditions provided in this embodiment include running, tunnel passing and beam replacement.

[0053] Beam Replacement Machine Travel: During actual construction, the beam replacement machine in this embodiment self-propelled itself from the beam yard along the existing rails to the beam section to be replaced. After the beam replacement is complete, it self-propelled back to the beam yard. During the travel and transport phase, the machine is in a low position; during the beam replacement phase, it is in a high position. Switching between travel and beam replacement modes is accomplished by retracting and extending the main legs. Figure 2 and Figure 5 This is the structural diagram of the beam changing machine in the running state. It can be seen from the figure that Figure 2 and Figure 5 The telescopic columns in the middle main legs are fully retracted, reducing their overall height to the minimum. During the main legs' extension and retraction (i.e., switching between high and low positions), the auxiliary legs support the entire beam changer. During the self-propelled movement of the beam changer, the auxiliary legs are in a flipped position.

[0054] Beam changing machine passing through tunnel: The main support leg in this embodiment is in the shape of a "mouth" as a whole, and its internal width is greater than the width of a single section of railway simply supported T beam, so the width of the main support leg is relatively large, such as Figure 4 As shown in the figure; if there is a tunnel between the beam yard and the construction site, since the width of the main support legs is greater than the width of the tunnel, it is necessary to use a folding mechanism to fold the two C-shaped half legs inward to make them parallel to the main beam. The width of the main support legs can be greatly reduced by folding, so that the entire beam changing machine can pass through the tunnel smoothly. Figure 3 and Figure 6 A schematic diagram of the main outriggers folded for tunnel passage shows the two C-shaped half-outriggers folded horizontally 90 degrees, significantly reducing the width of the main outriggers and enabling smooth tunnel passage. During the folding process, the auxiliary outriggers support the entire beam changer. After the folded outriggers are moved through the tunnel on their own, the auxiliary outriggers remain in a flipped position.

[0055] Changing beams with a beam-changing machine: The beam-changing process requires the cooperation of two front and rear beam transport vehicles 6. One of the two beam transport vehicles 6 is used to transport the dismantled old simply supported T-beam 7, and the other is used to transport the new simply supported T-beam 7 from the beam yard to the construction site. After the beam-changing machine finishes its low-position travel, it is necessary to extend the main legs when switching to the beam-changing state. At this time, the auxiliary legs support the entire beam-changing machine so that the main legs are off the ground. Then the pins on the telescopic columns are pulled out, and the telescopic oil cylinder drives the main legs to extend. After the height adjustment is completed, the pins are immediately inserted to lock the inner and outer columns. The auxiliary legs are then flipped over as a whole until the entire beam-changing construction process is completed. The steps of the beam-changing construction are as follows: Figure 12-Figure 19 As shown (the auxiliary legs are in a flipped state and not shown in the figure), the details are as follows:

[0056] (S1) The front and rear lifting trolleys lift the T-beam: The front and rear lifting trolleys lift the beam synchronously. When the beam is about to be in place, attention should be paid to the distance between the beam end and the beam transport vehicle (the beam feeding speed should be reduced when the beam is close to 1m away from the end of the beam transport vehicle).

[0057] (S2) The beam-carrying trolley connects the beam: the beam-carrying trolley drives into the bottom of the simply supported T-beam, with the center of the pedestal 1.3m away from the end of the beam. The lifting cylinder descends to the lowest position, placing the beam piece on the beam-carrying trolley, and the beam lifting operation is completed.

[0058] (S3) The beam-carrying trolley and the rear lifting trolley connect the beam synchronously: the rear lifting trolley and the beam-carrying trolley connect the beam synchronously. When the beam is about to be in place, it should run at a low speed.

[0059] (S4) The front and rear beam-carrying trolleys synchronously move the beams: After the front and rear beam-carrying trolleys synchronously move the beams into place, the beam transport vehicle carries the dismantled simply supported T beams back to the beam storage location.

[0060] (S5) Front hoisting trolley lifting beam: When lifting the beam, ensure that the distance between the first end of the lifting beam and the center of the rear main support leg is less than 3.5m, and the distance between the front and rear hoisting trolley centers is about 3.5m.

[0061] (S6) Rear hoisting trolley lifts the beam: After the rear hoisting trolley completes the beam lifting, the control connection line between the beam transporter and the bridge erection machine is removed. (S7) Synchronous beam feeding: The front and rear hoisting trolleys lift the beam synchronously, maintaining the same operating speed during the beam lifting process. When the front hoisting trolley approaches the position where the beam is to be erected, the speed is reduced.

[0062] (S8) Beam drop: When dropping the beam into position, attention should be paid to the gaps between the front and rear ends of the simply supported T-beam and the front main legs and the already erected beams. At the same time, attention should be paid to the horizontality of the four corners of the simply supported T-beam. The longitudinal and transverse deflections of the beam should not exceed 10‰.

[0063] After the beam is dropped, the beam changing machine completes the entire beam changing operation and switches to a low-position running state under the support of the auxiliary legs. The beam changing machine then returns to the beam yard or the next beam changing site. At the same time, the construction workers install and debug the tracks and electrical equipment on the newly replaced simply supported T-beam to restore the railway line to normal operation as soon as possible.

Claims

1. A railway simply supported T-beam replacement machine under operating conditions, comprising at least a main beam and a power system, an electro-hydraulic control system, and a driver's cab mounted on the main beam, characterized in that: The main beam is provided with: There are two lifting trolleys installed on the main beam and moving along the main beam; There are two main legs, connected to the front and rear sections of the main beam respectively. The main legs are shaped like a "mouth" and include two C-shaped half legs. The tops of the two half legs are hinged to the left and right sides of the main beam respectively, and the two half legs can be rotated horizontally to fold with the main beam under the drive of the folding mechanism; both half legs are provided with telescopic columns; There are two running wheel groups, including a running frame and a running wheel. The left and right sides of the running frame are respectively hinged to the bottom of the two C-shaped half legs. The running wheel is installed under the running frame. The running wheel group is used to drive the whole beam changing machine to travel; There are two auxiliary legs, which are respectively connected to the front and rear sections of the main beam and are located on the outside of the two main legs. The auxiliary legs are provided with a flipping mechanism for controlling the overall vertical flipping of the auxiliary legs to be parallel to the main beam, and a lifting mechanism for controlling the overall up and down lifting of the auxiliary legs.

2. The railway simply supported T-beam replacement machine under operating conditions according to claim 1, characterized in that: The main beam adopts a single-beam box-type structure. The single main beam is divided into 4 sections. Each section is a welded box-type structure, and the sections are connected with high-strength bolts. The side of the lower cover plate of the main beam is provided with a track for the movement of the lifting trolley, and the top of the ear beam of the main beam is provided with a track for the movement of the lifting trolley.

3. The railway simply supported T-beam replacement machine under operating conditions according to claim 1, characterized in that: The semi-support leg includes a first main beam connecting seat, an upper crossbeam, a telescopic column and a lower crossbeam. The first main beam connecting seat is fixed to the side surface of the upper part of the main beam by bolts. The upper crossbeam is hinged to the first main beam connecting seat through a vertical pin shaft. The telescopic column is connected between the upper crossbeam and the lower crossbeam. The telescopic column includes an outer column and an inner column, and a telescopic oil cylinder is installed between the two. The lower crossbeam is hinged to the running frame through a vertical pin shaft.

4. The railway simply supported T-beam replacement machine under operating conditions according to claim 3, characterized in that: The folding mechanism comprises a folding oil cylinder which is installed between the upper cross beam and the first main beam connecting seat.

5. The railway simply supported T-beam replacement machine under operating conditions according to claim 3, characterized in that: The inner columns are evenly provided with latch holes from top to bottom, and the bottoms of the outer columns are also correspondingly provided with latch holes, and latches are provided in the latch holes.

6. The railway simply supported T-beam replacement machine under operating conditions according to claim 1, characterized in that: The auxiliary support leg is composed of two single legs, which are respectively fixed on the left and right sides of the main beam. The single leg includes a second main beam connecting seat, a lifting column and a support seat. The second main beam connecting seat is fixed to the side of the upper part of the main beam by bolts. The top end of the lifting column is hinged to the second main beam connecting seat through a horizontal pin shaft, and the bottom end of the lifting column is connected and fixed to the support seat.

7. The railway simply supported T-beam replacement machine under operating conditions according to claim 6, characterized in that: The lifting mechanism includes a lifting cylinder, both ends of which are respectively connected to the inside of the lifting column, and the lifting and lowering control of the lifting cylinder assists the overall lifting of the supporting legs.

8. The railway simply supported T-beam replacement machine under operating conditions according to claim 6, characterized in that: The turning mechanism includes an upper turning seat, a lower turning seat and a turning cylinder. The upper turning seat is fixedly connected to the second main beam connecting seat, the lower turning seat is fixedly connected to the lifting column, the top end of the turning cylinder is hinged to the upper turning seat, and the bottom end is hinged to the lower turning seat.

9. The railway simply supported T-beam replacement machine under operating conditions according to claim 1, characterized in that: The lifting trolley adopts a suspended structure, and the entire suspension is set on the ear beam at the lower part of the main beam. The lifting trolley is located at the lower part of the main beam, and the top height of the lifting trolley is lower than the height after the auxiliary support legs are flipped.

10. The railway simply supported T-beam replacement machine under operating conditions according to claim 9, characterized in that: The hoisting trolley is equipped with two hoisting mechanisms, which are symmetrically distributed on the left and right sides of the main beam. The steel wire ropes in the two hoisting mechanisms are connected to a sling by a balanced winding and threading method.

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