Folding escalator capable of moving along with bridge girder erection machine and use method of folding escalator

Abstract

The invention discloses a folding escalator capable of moving along with a bridge erecting machine and a using method of the folding escalator, and belongs to the technical field of road and bridge construction auxiliary devices. The device comprises a bridge girder erection machine, a cage type vertical frame is arranged on the side part of the No.2 column of the bridge erecting machine; two entrances and exits are formed in the cage type vertical frame, one entrance and exit is arranged close to and right opposite to the bridge body, and a first-stage ladder stand frame is hinged and mounted at the position of the other entrance and exit; the tail end of the first-stage ladder stand frame is rotatably provided with a connecting suspender and a second-stage ladder stand frame respectively; the tail end of the secondary ladder stand frame is also provided with a connecting suspender and a floor joint; a plurality of electric hoists are mounted on the side beams of the bridge erecting machine; the connecting suspenders on the first-stage ladder stand frame and the second-stage ladder stand frame are connected to the electric hoist; the problems that a ladder stand device capable of changing the working position along with engineering propulsion is lacked, and the construction cost is increased and the construction time is prolonged easily due to repeated disassembly and assembly of the scaffold ladder stand are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of road and bridge construction auxiliary devices, and in particular to a folding escalator capable of moving with a bridge erecting machine and a use method thereof. Background Art

[0002] A bridge erection machine is a heavy-duty engineering machinery used in road and bridge construction. When using a bridge erection machine to erect an elevated bridge, in order to facilitate the operators to quickly go up and down the elevated bridge, a scaffolding ladder is often set up on the side of the currently erected construction bridge. However, as the construction continues, the prefabricated bridge will gradually extend forward, and the bridge erection machine will move forward accordingly. However, the scaffolding ladder cannot move with it due to the stability requirements of its bottom, so it can only be re-erected at a new work point, resulting in higher construction costs, and repeated erection of ladders will also lead to delays in the construction period. Based on this, it is necessary to design a ladder device that can change its own working position in real time as the project progresses. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a folding escalator that can move with a bridge erection machine to solve the current problem of lack of a ladder device that can change its own working position as the project progresses, and repeated disassembly and assembly of scaffolding ladders easily leads to increased construction costs and increased construction time.

[0004] To solve the above problems, the present invention provides the following technical solutions:

[0005] A folding escalator capable of moving with a bridge erecting machine; it comprises the bridge erecting machine; a cage-type vertical frame is arranged on the side of the second column of the bridge erecting machine; two inlets and outlets are opened on the cage-type vertical frame, one of the inlets and outlets is arranged close to and facing the bridge body, and a first-level ladder frame is hingedly installed at the position of the other inlet and outlet; a connecting suspension rod and a second-level ladder frame are rotatably installed at the tail end of the first-level ladder frame; a connecting suspension rod and a ground joint are also installed at the tail end of the second-level ladder frame; a plurality of electric hoists are installed on the side beams of the bridge erecting machine; and the connecting suspension rods on the first-level ladder frame and the second-level ladder frame are connected to the electric hoist.

[0006] Preferably, the cage-type frame includes a base plate; a plurality of vertical poles are arranged on the circumferential side of the top of the base plate; a reinforcing clamp is arranged at the upper middle part of the vertical pole, and a plurality of cantilever support poles fixedly connected to the body of the bridge-building machine are also arranged on the vertical pole; a guardrail is arranged at the lower middle part of the vertical pole; a step plate is arranged on the front side of the base plate facing the bridge body; an ear plate with a positioning hole is also arranged on the cage-type frame; the upper part of the first-level ladder frame is hinged at the position of the ear plate; and a protective handrail is also arranged on the vertical pole corresponding to the outer side of the step plate and the ear plate.

[0007] Preferably, the structures of the first-level ladder frame and the second-level ladder frame are similar, both of which include a planar ladder body, and the ladder bodies of the first-level ladder frame and the second-level ladder frame are hinged to each other at the end positions; the top of the ladder body is hinged to the cage-type vertical frame; grid-shaped guardrails are vertically arranged on both sides of the ladder body; a plurality of handrail support rods are arranged on the top of the two guardrails; a reinforcing rod or a rib plate is also arranged between the handrail support rod and the guardrail; a handrail cable is passed between two adjacent handrail support rods on the same guardrail; and a connecting suspension rod is hingedly installed at the outer side of the lower end of the ladder body.

[0008] Furthermore, the number of handrail support rods on a single guardrail is not less than 3, and the handrail support rod located at the highest position is correspondingly arranged at the upper middle part of the guardrail; a cylindrical top rail is also arranged on the upper section of the guardrail where the handrail support rod and the cable are not installed.

[0009] Furthermore, a plurality of counterweights are provided at the lower middle portion of the ladder body of the secondary ladder frame; and a floor joint is detachably mounted at the bottom end of the ladder body of the secondary ladder frame.

[0010] Furthermore, anti-drop chains and universal joint guardrails are respectively arranged between the guardrails and handrail supports of the first-level ladder frame and the second-level ladder frame; the universal joint guardrail includes movable joints respectively hingedly installed on the two handrail supports; a movable railing is installed on one of the movable joints, and a locking sleeve is installed on the other movable joint; the other end of the movable railing is set through the locking sleeve.

[0011] Preferably, a plurality of cantilever brackets are provided on the side beams of the bridge erecting machine; the electric hoist is installed on the cantilever bracket; the connecting booms on the first-level ladder frame and the second-level ladder frame are arranged in pairs, and are rotatably installed at the left and right outer end surfaces through lifting rings respectively; a triangular pulling frame is also provided on the top of a pair of connecting booms; and the lifting head of the electric hoist is installed on the pulling frame.

[0012] Preferably, the landing joint includes a positioning clamp installed at the bottom of the secondary ladder frame; a rotating drum is rotatably installed on the positioning clamp; an internal threaded section is in the inner cavity at the end side of the rotating drum; an adjusting screw is movably installed in the rotating drum through a threaded connection; a nut is also provided at the end of the adjusting screw remaining on the outside of the rotating drum; a lead screw rotating rod is movably installed on the nut; a handle and a pressure plate are respectively provided at the upper and lower ends of the lead screw rotating rod; the pressure plate is pressed on the ground, and a reinforcing nail is also provided on the pressure plate; a limit clamp that can prevent the rotating drum from rotating is also detachably installed on the rotating drum.

[0013] Preferably, a plurality of third-level ladder racks are detachably hingedly installed between the first-level ladder rack and the second-level ladder rack; the structure of the third-level ladder rack is consistent with that of the second-level ladder rack.

[0014] The invention also discloses a method for using a folding escalator that can move with a bridge erecting machine, which includes a walking state that moves with the bridge erecting machine and a use state when the bridge erecting machine stops steadily and is at a corresponding work station;

[0015] When the folding escalator is in the walking state, the landing joint is separated from the ground, and the locking sleeve of the universal joint guardrail is in a relaxed state; the step board on the first-level ladder frame is removed to prevent the step board from interfering with the bridge deck during movement; the electric hoist pulls the second-level ladder frame upwards, and when the bridge crane moves, the electric hoist can be controlled as needed to adjust the positions of the first-level ladder frame and the second-level ladder frame at the same time;

[0016] When the bridge-building machine is in place, the folding escalator needs to be converted from a mobile state to a usable state; the corresponding electric hoists coordinate the control of the first-level ladder frame and the second-level ladder frame to be lowered until the bottom of the second-level ladder frame is close to the ground; thereafter, the bottom of the second-level ladder frame is connected to the ground using a floor joint, and the electric hoist corresponding to the first-level ladder frame is controlled to adjust the position of the first-level ladder frame while ensuring that the electric hoist corresponding to the second-level ladder frame does not move, so that the angle between the first-level ladder frame and the second-level ladder frame does not exceed 20°; thereafter, the position of the movable railing is locked through the locking sleeve of the universal joint guardrail, and the step board is installed to complete the installation of the folding escalator.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a folding escalator system capable of synchronously moving with a bridge erecting machine, wherein a cage-type stand is arranged on the side of the No. 2 column of the bridge erecting machine as a position for an operator to stand after climbing the ladder, so that an inlet and outlet of the cage-type stand faces a hypothetical bridge as a passage; thereafter, an electric hoist is installed on the top beam of the bridge erecting machine, and the position of the ladder stand is controlled by lifting the electric hoist, the ladder stands are hinged to each other, the top of the ladder stands is hinged to the cage-type stand, and the bottom is connected to the ground through a floor joint; the labor cost and time for erecting / disassembling a scaffolding ladder can be effectively controlled through the folding escalator structure, the protection is reliable, and the inclination of the ladder can be adjusted and changed according to site needs within the safety allowable range, so as to meet the use needs in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the case where only a primary ladder rack and a secondary ladder rack are provided in the present embodiment 1;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the cage stand in the present invention;

[0021] Figure 3 is a schematic diagram of a force model for analyzing a ladder frame in Example 1;

[0022] Figures 4 to 6 Respectively in Figure 3 Bending moment diagram, shear force diagram and axial force diagram of the ladder frame on the foundation;

[0023] Figure 7 is a schematic diagram of a force model for analyzing an electric hoist support in Example 1;

[0024] Figures 8 to 10 Respectively in Figure 7 Bending moment diagram, shear force diagram and axial force diagram of the electric hoist bracket on the foundation;

[0025] Fig.11 is a schematic structural diagram of the first ladder frame and the second ladder frame in the hinged state in Example 1;

[0026] Fig.12 yes Fig.11 A partial enlarged schematic diagram of the position of the middle universal joint guardrail;

[0027] Fig.13 is a schematic structural diagram of the ground connection joint of Example 1;

[0028] Fig.14 It is a lateral schematic diagram in which the counterweight and the landing joint are both arranged on the secondary ladder frame;

[0029] Fig.15 It is a forward schematic diagram of arranging the counterweight and the landing joint on the secondary ladder frame;

[0030] Fig.16 This is a schematic diagram of the structure when a first-level ladder rack, a second-level ladder rack and a third-level ladder rack are provided in Example 2.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. bridge erecting machine, 2. cage-type frame, 2A. bottom plate, 2B. upright pole, 2C. reinforcement clamp ring, 2D. cantilever support rod, 2E. guardrail, 2F. step-over board, 2G. ear plate, 2H. protective handrail, 3. primary ladder frame, 3A. ladder body, 3B. guardrail, 3C. handrail support rod, 3D. handrail cable, 3E. top rail, 4. connecting suspension rod, 5. secondary ladder frame, 6. landing joint, 6A. positioning clamp head, 6B. rotating drum, 6C. adjusting screw, 6D, nut, 6E. screw rotating rod, 6F, handle, 6G, pressure plate, 6H, reinforcement nail, 7. electric hoist, 8. counterweight, 9. universal joint guardrail, 9A. movable clamp joint, 9B, movable railing, 9C, locking sleeve, 10. third ladder frame. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] Embodiment 1:

[0034] Reference Figure 1The present embodiment provides a folding escalator that can move with a bridge erecting machine; it includes a bridge erecting machine 1; a cage-type frame 2 is arranged on the side of the bridge erecting machine column 12; two inlets and outlets are opened on the cage-type frame 2, one of which is arranged close to the bridge body, and a first-level ladder frame 3 is hingedly installed at the other inlet and outlet; a connecting rod 4 and a second-level ladder frame 5 are rotatably installed at the tail end of the first-level ladder frame 3; a connecting rod 4 and a ground joint 6 are also installed at the tail end of the second-level ladder frame 5; a plurality of electric hoists 7 are installed on the side beams of the bridge erecting machine 1; the connecting rods 4 on the first-level ladder frame 3 and the second-level ladder frame 5 are both connected to the electric hoist 7.

[0035] The cage-type frame 2 includes a bottom plate 2A; a plurality of vertical poles 2B are arranged around the top of the bottom plate 2A; a reinforcing clamp 2C is arranged at the upper middle position of the vertical pole 2B, and a plurality of groups of cantilevered support poles 2D fixedly connected to the body of the bridge erecting machine 1 are also arranged on the vertical pole 2B; a guardrail 2E is arranged at the lower middle position of the vertical pole 2B; a step plate 2F is arranged on the front side of the bottom plate facing the bridge body; an ear plate 2G with a positioning hole is also arranged on the cage-type frame 2; the upper part of the first-level ladder frame 3 is hinged at the position of the ear plate 2G; a protective handrail 2H is also arranged on the vertical pole 2B corresponding to the outer side of the step plate 2F and the ear plate 2G

[0036] The structures of the first-level ladder frame 3 and the second-level ladder frame 5 are similar, both of which include a planar ladder body 3A, and the ladder bodies 3A of the first-level ladder frame 3 and the second-level ladder frame 5 are hinged to each other at the end positions; the top of the ladder body 3A is hinged to the cage-type frame 2; grid-shaped guardrails 3B are vertically arranged on both sides of the ladder body 3A; a plurality of handrail support rods 3C are arranged on the top of the two guardrails 3B; a reinforcing rod or rib plate is also arranged between the handrail support rod 3C and the guardrail 3B; a handrail cable 3D is passed between two adjacent handrail support rods 3C on the same guardrail 3B; and the connecting suspension rod 4 is hingedly installed at the outer side of the lower end of the ladder body 3A.

[0037] The number of handrail support rods 3C on a single guardrail 3B is not less than 3, and the handrail support rod 3C located at the highest position is correspondingly arranged at the upper middle position of the guardrail 3B; a cylindrical top rail 3E is also arranged on the upper section of the guardrail 3B where the handrail support rod 3C and the cable 3D are not installed.

[0038] A plurality of counterweights 8 are provided at the lower middle part of the ladder body 3A of the secondary ladder frame 5; a ground joint 6 is also detachably installed at the bottom end of the ladder body 3A of the secondary ladder frame 5. The counterweight in this embodiment is a signboard, and a clamping block is rotatably provided on the side of the ladder frame; the signboard is movably installed on the clamping block, and the lower side of the signboard stands on the ground for installation.

[0039] Anti-drop chains and universal joint guardrails 9 are respectively arranged between the guardrails 3B and the handrail support rods 3C of the first-level ladder frame 3 and the second-level ladder frame 5; the universal joint guardrail 9 includes movable clamping sections 9A respectively hingedly installed on the two handrail support rods 3C; a movable railing 9B is installed on one of the movable clamping sections 9A, and a locking sleeve 9C is installed on the other movable clamping section 9A; the other end of the movable railing 9B is arranged through the locking sleeve 9C.

[0040] A plurality of cantilever brackets are arranged on the side beams of the bridge erecting machine 1; the electric hoist 7 is installed on the cantilever brackets; the connecting booms 4 on the primary ladder frame 3 and the secondary ladder frame 5 are arranged in pairs, and are rotatably installed at the left and right outer end surfaces through lifting rings respectively; a triangular pulling frame is also arranged on the top of a pair of connecting booms 4; the lifting head of the electric hoist 7 is installed on the pulling frame.

[0041] The landing joint 6 includes a positioning clamp 6A installed at the bottom of the secondary ladder frame 5; a rotating drum 6B is rotatably installed on the positioning clamp 6A; an internal thread section is in the inner cavity of the end side of the rotating drum 6B; an adjusting screw 6C is movably installed in the rotating drum 6B through a threaded connection; a nut 6D is also provided at the end of the adjusting screw 6C remaining outside the rotating drum 6B; a lead screw rotating rod 6E is movably installed on the nut 6D; a handle 6F and a pressure plate 6G are respectively provided at the upper and lower ends of the lead screw rotating rod 6E; the pressure plate 6G is pressed on the ground, and a reinforcing nail 6H is also provided on the pressure plate 6G; a limit clamp capable of preventing the rotating drum 6B from rotating is also detachably installed on the rotating drum 6B. In this embodiment, a limit hole is opened at the relative position of the rotating drum and the positioning clamp, and the limit clamp is a limit pin that can be set at the position of the limit hole. In this embodiment, a flange structure similar to that connected by a pin is formed between the positioning clamp and the rotating drum, that is, the positioning pin and the ear plate are prevented from rotating relative to each other by the pin located outside the axis.

[0042] The invention also discloses a method for using a folding escalator that can move with a bridge erecting machine, which includes a walking state that moves with the bridge erecting machine and a use state when the bridge erecting machine stops steadily and is at a corresponding work station;

[0043] When the folding escalator is in the walking state, the landing joint 6 is separated from the ground, and the locking sleeve 9C of the universal joint guardrail 9 is in a relaxed state; the stepping plate 2F on the first-level ladder frame 3 is removed to prevent the stepping plate 2F from interfering with the bridge deck during the movement; the electric hoist 7 pulls the second-level ladder frame 5 upwards, and when the bridge erection machine moves, the electric hoist 7 can be controlled as needed to adjust the positions of the first-level ladder frame 3 and the second-level ladder frame 5 at the same time;

[0044] When the bridge-building machine is in place, the folding escalator needs to be converted from a mobile state to a use state; the corresponding electric-controlled hoist 7 coordinates and controls the first-level ladder frame 3 and the second-level ladder frame 5 to be lowered until the bottom of the second-level ladder frame 5 is close to the ground; thereafter, the bottom of the second-level ladder frame 5 is connected to the ground using the ground joint 6, and the electric-controlled hoist 7 corresponding to the first-level ladder frame 3 is controlled to adjust the position of the first-level ladder frame 3 while ensuring that the electric-controlled hoist 7 corresponding to the second-level ladder frame 5 does not move, so that the angle between the first-level ladder frame 3 and the second-level ladder frame 5 does not exceed 20°; thereafter, the position of the movable railing 9B is locked by the locking sleeve 9C of the universal joint guardrail 9, and the installation of the step board 2F is completed.

[0045] In this embodiment, the length of the first-stage ladder frame and the second-stage ladder frame is 9m, the ladder frame weighs 0.6t, and the main tube of the ladder frame adopts 85X4 steel pipe is made of 20# steel.

[0046] When calculating the forces on the ladder, the most dangerous condition is that two people climb to the middle of the first ladder frame at the same time.

[0047] according to Figure 3 The middle structure is used as a model, and the bending moment diagram, shear force diagram and axial force diagram of the ladder main pipe can be obtained as follows: Figures 4 to 6 ;

[0048] The cross-sectional characteristics of the main pipe are shown in the following table:

[0049] Section geometry parameter table

[0050]

[0051] Calculate the stress on the steel pipe:

[0052] M=0.27tm, Q=0.15t, N=0.26t

[0053]

[0054]

[0055] The comprehensive stress is:

[0056]

[0057] Meet strength requirements.

[0058] In this embodiment, the length of the cage-type frame is 4m, and its deadweight is 0.2t. The four vertical poles on the peripheral side are processed by welding ∠70x6 angle steel on the bottom plate, and the material of the angle steel is Q235B.

[0059] When calculating the cage stand, the most dangerous working condition is that two people are in the hanging basket at the same time, and half of the weight of the ladder is borne by the hanging basket; at this time, the force on the hanging basket includes its own weight, half of the weight of the ladder and the weight of the person:

[0060] 0.2t+0.3t+0.2t=0.7t;

[0061] The cross-sectional characteristics of the cage stand are shown in the following table:

[0062] Section geometry parameter table

[0063]

[0064] Calculate the stress on the side bars of the cage frame:

[0065]

[0066] Meet strength requirements.

[0067] In this embodiment, there are two cantilever support rods on the cage frame, the distance between the two cantilever support rods is 700mm, the length of a single cantilever support rod is 1.2m, and the material is Q235B [18 channel steel;

[0068] When calculating the cantilever support rod, the most dangerous working condition is consistent with the most dangerous working condition when calculating the cage stand, and its total force is also: 0.2t+0.3t+0.2t=0.7t;

[0069] The cross-sectional characteristics of the cantilever support rod are shown in the following table:

[0070] Section geometry parameter table

[0071]

[0072] Calculate the stress on the cantilever support:

[0073] M=0.7×1.2=0.84tm, Q=0.7t

[0074]

[0075] The comprehensive stress is:

[0076]

[0077] Meet strength requirements.

[0078] In this embodiment, the standard load-bearing capacity of the two electric hoists is 2t, and the deadweight of the hoists is 0.2t; the electric hoists are connected to the beam of the bridge erecting machine through hoist brackets, and the structure of the hoist brackets is similar to that of the cantilever support rods, and they are also made of Q235B [18 channel steel.

[0079] Depend on Figure 3 It can be seen that the pulling force at the bottom of the hoist is 0.57t. The deadweight of a 2t hoist is 0.2t, and the force on the hoist support is 0.77t, which is calculated as 1t.

[0080] by Figure 7 The structure in the middle is used as a model, and the bending moment diagram, shear force diagram and axial force diagram of the hoist bracket can be obtained as follows Figure 8 to Figure 10 ;

[0081] The cross-sectional characteristics of the hoist support are as follows:

[0082]

[0083] Calculate the stress on the hoist support:

[0084] M=0.5tm, Q=1t, N=2.33t

[0085]

[0086] The comprehensive stress is:

[0087]

[0088] Example 2

[0089] The other structures in this embodiment are basically the same as those in Embodiment 1 and will not be described in detail here. The difference between the two lies in the different working environments they face. In this embodiment, the height of the bridge pier is relatively higher, taking into account: a number of third-level ladder frames 10 are detachably hingedly installed between the first-level ladder frame 3 and the second-level ladder frame 5; the structure of the third-level ladder frame 10 is consistent with that of the second-level ladder frame 5; and universal joint guardrails are provided between the upper and lower hinged ladder frames.

Claims

1. A folding escalator that can move with a bridge erecting machine, characterized in that: The invention comprises a bridge erecting machine (1); a cage-type frame (2) is arranged on the side of the No. 2 column of the bridge erecting machine (1); two inlets and outlets are opened on the cage-type frame (2), one of the inlets and outlets is arranged close to and directly opposite to the bridge body, and a first-level ladder frame (3) is hingedly installed at the position of the other inlet and outlet; a connecting rod (4) and a second-level ladder frame (5) are rotatably installed at the tail end of the first-level ladder frame (3); a connecting rod (4) and a landing joint (6) are also installed at the tail end of the second-level ladder frame (5); a plurality of electric hoists (7) are installed on the side beams of the bridge erecting machine (1); and the connecting rods (4) on the first-level ladder frame (3) and the second-level ladder frame (5) are both connected to the electric hoists (7).

2. A foldable escalator that can move with a bridge erecting machine according to claim 1, characterized in that: The cage-type frame (2) comprises a bottom plate (2A); a plurality of vertical poles (2B) are arranged on the circumferential side of the top of the bottom plate (2A); a reinforcing clamp (2C) is arranged at the upper middle position of the vertical pole (2B), and a plurality of groups of cantilevered support poles (2D) fixedly connected to the body of the bridge erecting machine (1) are also arranged on the vertical pole (2B); a guardrail (2E) is arranged at the lower middle position of the vertical pole (2B); a step plate (2F) is arranged on the front side of the bottom plate facing the bridge body; an ear plate (2G) with a positioning hole is also arranged on the cage-type frame (2); the upper part of the first-level ladder frame (3) is hinged at the position of the ear plate (2G); and a protective handrail (2H) is also arranged on the vertical pole (2B) corresponding to the outer side of the step plate (2F) and the ear plate (2G).

3. The foldable escalator movable with the bridge erecting machine according to claim 1, characterized in that: The structure of the primary ladder frame (3) is similar to that of the secondary ladder frame (5), and both of them include a plane ladder body (3A), and the ladder bodies (3A) of the primary ladder frame (3) and the secondary ladder frame (5) are hinged to each other at the end positions; the top of the ladder body (3A) is hinged to the cage-type vertical frame (2); grid-shaped guardrails (3B) are vertically arranged on both sides of the ladder body (3A); a plurality of handrail support rods (3C) are arranged on the top of the two guardrails (3B); a reinforcing rod or a rib plate is also arranged between the handrail support rod (3C) and the guardrail (3B); a handrail cable (3D) is passed between two adjacent handrail support rods (3C) on the same guardrail (3B); and a connecting suspension rod (4) is hingedly installed at the outer side of the lower end of the ladder body (3A).

4. A foldable escalator movable with a bridge erecting machine according to claim 3, characterized in that: The number of handrail support rods (3C) on a single guardrail (3B) is not less than 3, and the handrail support rod (3C) located at the highest position is correspondingly arranged at a position close to the upper middle part of the guardrail (3B); a cylindrical top rail (3E) is also arranged on the upper section of the guardrail (3B) where the handrail support rod (3C) and the cable (3D) are not installed.

5. The foldable escalator movable with the bridge erecting machine according to claim 3, characterized in that: A plurality of counterweights (8) are also provided at the lower middle portion of the ladder body (3A) of the secondary ladder frame (5); and a floor joint (6) is also detachably mounted at the bottom end of the ladder body (3A) of the secondary ladder frame (5).

6. The foldable escalator movable with the bridge erecting machine according to claim 3, characterized in that: Anti-drop chains and universal joint guardrails (9) are respectively arranged between the guardrails (3B) and handrail struts (3C) of the primary ladder frame (3) and the secondary ladder frame (5); the universal joint guardrails (9) include movable clamping sections (9A) respectively hingedly mounted on two handrail struts (3C); a movable railing (9B) is mounted on one of the movable clamping sections (9A), and a locking sleeve (9C) is mounted on the other movable clamping section (9A); the other end of the movable railing (9B) passes through the locking sleeve (9C) for installation.

7. The foldable escalator movable with the bridge erecting machine according to claim 1, characterized in that: A plurality of cantilever brackets are arranged on the side beam of the bridge erecting machine (1); the electric hoist (7) is installed on the cantilever bracket; the connecting suspension rods (4) on the primary ladder frame (3) and the secondary ladder frame (5) are arranged in pairs and are rotatably installed at the left and right outer end surfaces through suspension rings; a triangular pulling frame is also arranged on the top of the pair of connecting suspension rods (4); and the lifting head of the electric hoist (7) is installed on the pulling frame.

8. The foldable escalator movable with the bridge erecting machine according to claim 1, characterized in that: The landing joint (6) comprises a positioning clamp (6A) mounted at the bottom of the secondary ladder frame (5); a rotating drum (6B) is rotatably mounted on the positioning clamp (6A); an internal thread section is provided in the inner cavity at the end of the rotating drum (6B); an adjusting screw (6C) is movably mounted in the rotating drum (6B) through a threaded connection; a nut (6D) is also provided at the end of the adjusting screw (6C) remaining outside the rotating drum (6B); a lead screw rotating rod (6E) is movably mounted on the nut (6D); a handle (6F) and a pressure plate (6G) are respectively provided at the upper and lower ends of the lead screw rotating rod (6E); the pressure plate (6G) is pressed against the ground, and a reinforcing nail (6H) is also provided on the pressure plate (6G); and a limit clamp capable of preventing the rotating drum (6B) from rotating is also detachably mounted on the rotating drum (6B).

9. A method for using a foldable escalator that can move with a bridge erecting machine according to any one of claims 1 to 8, characterized in that: It includes the walking state when the bridge erecting machine moves and the using state when the bridge erecting machine stops at the corresponding working position; When the folding escalator is in the walking state, the landing joint (6) is separated from the ground, and the locking sleeve (9C) of the universal joint guardrail (9) is in a relaxed state; the step plate (2F) on the first-level ladder frame (3) is removed to prevent the step plate (2F) from interfering with the bridge deck during movement; the electric hoist (7) pulls the second-level ladder frame (5) upwards, and when the bridge erection machine moves, the electric hoist (7) can be controlled as needed to simultaneously adjust the positions of the first-level ladder frame (3) and the second-level ladder frame (5); When the bridge erection machine is in place, the folding escalator needs to be converted from a mobile state to a use state; the corresponding electric control hoist (7) coordinates and controls the first ladder frame (3) and the second ladder frame (5) to be lowered until the bottom of the second ladder frame (5) is close to the ground; thereafter, the bottom of the second ladder frame (5) is connected to the ground using a floor joint (6), and the electric control hoist (7) corresponding to the first ladder frame (3) is controlled to adjust the position of the first ladder frame (3) while ensuring that the electric control hoist (7) corresponding to the second ladder frame (5) does not move, so that the angle between the first ladder frame (3) and the second ladder frame (5) does not exceed 20 degrees; thereafter, the position of the movable railing (9B) is locked by the locking sleeve (9C) of the universal joint guardrail (9), and then the step board (2F) is installed to complete the installation of the folding escalator.

10. The foldable escalator movable with the bridge erecting machine according to claim 1, characterized in that: A plurality of third-level ladder frames (10) are detachably hingedly mounted between the first-level ladder frame (3) and the second-level ladder frame (5); the structure of the third-level ladder frame (10) is consistent with that of the second-level ladder frame (5).

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